initial-include VPN demo securephone

2026-07-29 13:52:10 +07:00
1 parent 1da580593f
commit ce61f6be0a
@@ -1,35 +1,13 @@
 # ---> Android
 # Gradle files
 .gradle/
 build/
 # Local configuration file (sdk path, etc)
 local.properties
 # Log/OS Files
 *.log
 # Android Studio generated files and folders
 captures/
 .externalNativeBuild/
 .cxx/
 *.apk
 output.json
 # IntelliJ
 *.iml
-.idea/
+.gradle
-misc.xml
+/local.properties
-deploymentTargetDropDown.xml
+/.idea/workspace.xml
-render.experimental.xml
+/.idea/libraries
-
+.DS_Store
-# Keystore files
+/build
-*.jks
+/captures
-*.keystore
+/app/build
-
+/app/release
-# Google Services (e.g. APIs or Firebase)
+.externalNativeBuild
-google-services.json
+*.apk
-
+*.apk
 # Android Profiling
 *.hprof
@@ -0,0 +1,3 @@
 # Default ignored files
 /shelf/
 /workspace.xml
@@ -0,0 +1,28 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="AppInsightsSettings">
    <option name="tabSettings">
      <map>
        <entry key="Android Vitals">
          <value>
            <InsightsFilterSettings>
              <option name="connection">
                <ConnectionSetting>
                  <option name="appId" value="id.ontime.customer" />
                </ConnectionSetting>
              </option>
              <option name="failureTypes">
                <list>
                  <option value="FATAL" />
                </list>
              </option>
              <option name="signal" value="SIGNAL_UNSPECIFIED" />
              <option name="timeIntervalDays" value="SEVEN_DAYS" />
              <option name="visibilityType" value="ALL" />
            </InsightsFilterSettings>
          </value>
        </entry>
      </map>
    </option>
  </component>
 </project>
@@ -0,0 +1,32 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="WizardSettings">
    <option name="children">
      <map>
        <entry key="vectorWizard">
          <value>
            <PersistentState>
              <option name="children">
                <map>
                  <entry key="vectorAssetStep">
                    <value>
                      <PersistentState>
                        <option name="values">
                          <map>
                            <entry key="assetSourceType" value="FILE" />
                            <entry key="outputName" value="secure_green" />
                            <entry key="sourceFile" value="C:\a\git\image\secure-green.svg" />
                          </map>
                        </option>
                      </PersistentState>
                    </value>
                  </entry>
                </map>
              </option>
            </PersistentState>
          </value>
        </entry>
      </map>
    </option>
  </component>
 </project>
@@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="CompilerConfiguration">
    <bytecodeTargetLevel target="11" />
  </component>
 </project>
@@ -0,0 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="deploymentTargetDropDown">
    <value>
      <entry key="app">
        <State />
      </entry>
    </value>
  </component>
 </project>
@@ -0,0 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="GradleMigrationSettings" migrationVersion="1" />
  <component name="GradleSettings">
    <option name="linkedExternalProjectsSettings">
      <GradleProjectSettings>
        <option name="testRunner" value="GRADLE" />
        <option name="externalProjectPath" value="$PROJECT_DIR$" />
        <option name="gradleJvm" value="Embedded JDK" />
        <option name="modules">
          <set>
            <option value="$PROJECT_DIR$" />
            <option value="$PROJECT_DIR$/app" />
          </set>
        </option>
        <option name="resolveExternalAnnotations" value="false" />
      </GradleProjectSettings>
    </option>
  </component>
 </project>
@@ -0,0 +1,30 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="RemoteRepositoriesConfiguration">
    <remote-repository>
      <option name="id" value="central" />
      <option name="name" value="Maven Central repository" />
      <option name="url" value="https://repo1.maven.org/maven2" />
    </remote-repository>
    <remote-repository>
      <option name="id" value="jboss.community" />
      <option name="name" value="JBoss Community repository" />
      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
    </remote-repository>
    <remote-repository>
      <option name="id" value="BintrayJCenter" />
      <option name="name" value="BintrayJCenter" />
      <option name="url" value="https://jcenter.bintray.com/" />
    </remote-repository>
    <remote-repository>
      <option name="id" value="Google" />
      <option name="name" value="Google" />
      <option name="url" value="https://dl.google.com/dl/android/maven2/" />
    </remote-repository>
    <remote-repository>
      <option name="id" value="MavenRepo" />
      <option name="name" value="MavenRepo" />
      <option name="url" value="https://repo.maven.apache.org/maven2/" />
    </remote-repository>
  </component>
 </project>
@@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="Kotlin2JvmCompilerArguments">
    <option name="jvmTarget" value="11" />
  </component>
 </project>
@@ -0,0 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="ProjectMigrations">
    <option name="MigrateToGradleLocalJavaHome">
      <set>
        <option value="$PROJECT_DIR$" />
      </set>
    </option>
  </component>
 </project>
@@ -0,0 +1,12 @@
 <project version="4">
  <component name="EntryPointsManager">
    <pattern value="backone.cloud.call.ContactListAdapter" />
    <pattern value="backone.cloud.call.ContactListAdapter" method="log" />
  </component>
  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
    <output url="file://$PROJECT_DIR$/build/classes" />
  </component>
  <component name="ProjectType">
    <option name="id" value="Android" />
  </component>
 </project>
@@ -0,0 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="ProjectModuleManager">
    <modules>
      <module fileurl="file://$PROJECT_DIR$/.idea/modules/Bachot_New.iml" filepath="$PROJECT_DIR$/.idea/modules/Bachot_New.iml" />
      <module fileurl="file://$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.iml" filepath="$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.iml" />
      <module fileurl="file://$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.androidTest.iml" filepath="$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.androidTest.iml" />
      <module fileurl="file://$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.main.iml" filepath="$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.main.iml" />
      <module fileurl="file://$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.unitTest.iml" filepath="$PROJECT_DIR$/.idea/modules/app/Bachot_New.app.unitTest.iml" />
    </modules>
  </component>
 </project>
@@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="VcsDirectoryMappings">
    <mapping directory="" vcs="Git" />
  </component>
 </project>
@@ -0,0 +1,674 @@
                    GNU GENERAL PUBLIC LICENSE
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 License would be to refrain entirely from conveying the Program.
  13. Use with the GNU Affero General Public License.
  Notwithstanding any other provision of this License, you have
 permission to link or combine any covered work with a work licensed
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 section 13, concerning interaction through a network will apply to the
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  14. Revised Versions of this License.
  The Free Software Foundation may publish revised and/or new versions of
 the GNU General Public License from time to time.  Such new versions will
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  Each version is given a distinguishing version number.  If the
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  If the Program specifies that a proxy can decide which future
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            How to Apply These Terms to Your New Programs
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 possible use to the public, the best way to achieve this is to make it
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  To do so, attach the following notices to the program.  It is safest
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 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 Also add information on how to contact you by electronic and paper mail.
  If the program does terminal interaction, make it output a short
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    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, your program's commands
 might be different; for a GUI interface, you would use an "about box".
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <http://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
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 Public License instead of this License.  But first, please read
 <http://www.gnu.org/philosophy/why-not-lgpl.html>.
@@ -1,3 +1,21 @@
-# bachotbakwan
+# bachot
 backone Chat system
-Secure Call 
+Backchat all channel
 True P2P voice- and video phone calls without the need for accounts or access to the Internet. There is no discovery mechanism, no meshing and no servers. Just scan each others QR-Code that will contain the contacts IP address. This works in many local networks such as community mesh networks, company networks or at home.
 Features:
 - voice and video calls
 - accounts or registration activated via backone network
 - encrypted communication
 - database backup and encryption
 - add custom addresses to reach contacts
 Limitations:
 - no calls after MAC / IP address change
 ## Documentation
 Connects to IP addresses in a true P2P fashion. Contacts are shared via QR-Code. They contain a name, a public key and a list of MAC/IPv4/IPv6 addresses or domain names. By default, only a single MAC address is transferred and used to create an IPv6 link local address (among others) to establish a connection. This does not even need a DHCP server. The exchanged public key is used to authenticate/encrypt signaling data to establish a [WebRTC](https://webrtc.org/) session that can transmit voice and video.
@@ -0,0 +1 @@
 /build
@@ -0,0 +1,106 @@
 apply plugin: 'com.android.application'
 // Canonical version literals — bumped in-place on assemble/bundle/install.
 def versionCodeValue = 325
 def versionNameValue = '0.3.1.15'
 ext.bumpAppVersion = { boolean persist ->
    def buildGradle = file("build.gradle")
    def text = buildGradle.text
    def codeMatcher = text =~ /def versionCodeValue\s*=\s*(\d+)/
    if (!codeMatcher.find()) {
        throw new GradleException("Could not find versionCodeValue in ${buildGradle}")
    }
    def oldCode = codeMatcher.group(1) as int
    def newCode = oldCode + 1
    def nameMatcher = text =~ /def versionNameValue\s*=\s*'([^']+)'/
    if (!nameMatcher.find()) {
        throw new GradleException("Could not find versionNameValue in ${buildGradle}")
    }
    def oldName = nameMatcher.group(1)
    def parts = oldName.tokenize('.')
    if (parts.isEmpty()) {
        throw new GradleException("versionName '${oldName}' has no segments to bump")
    }
    parts[-1] = ((parts[-1] as int) + 1).toString()
    def newName = parts.join('.')
    if (persist) {
        text = text.replaceFirst(/def versionCodeValue\s*=\s*\d+/, "def versionCodeValue = ${newCode}")
        text = text.replaceFirst(/def versionNameValue\s*=\s*'[^']+'/, "def versionNameValue = '${newName}'")
        buildGradle.text = text
        println "Bumped version: ${oldCode} / ${oldName} -> ${newCode} / ${newName}"
        return [code: newCode, name: newName]
    }
    return [code: oldCode, name: oldName]
 }
 // Bump before AGP reads defaultConfig so this build's APK gets the new version.
 def requestedTasks = gradle.startParameter.taskNames.collect { it.toLowerCase() }
 def shouldBumpOnBuild = requestedTasks.any { name ->
    def leaf = name.contains(':') ? name.substring(name.lastIndexOf(':') + 1) : name
    leaf.startsWith('assemble') || leaf.startsWith('bundle') || leaf.startsWith('install')
 }
 if (shouldBumpOnBuild) {
    def bumped = bumpAppVersion(true)
    versionCodeValue = bumped.code
    versionNameValue = bumped.name
 }
 android {
    signingConfigs {
    }
    compileSdkVersion 34
    defaultConfig {
        applicationId "backone.cloud.call"
        minSdk 26
        targetSdk 34
        versionCode versionCodeValue
        versionName versionNameValue
        multiDexEnabled true
        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
        vectorDrawables.useSupportLibrary = true
        setProperty("archivesBaseName", project.getParent().name+"-"+versionName)
    }
    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }
 }
 dependencies {
    implementation project(':backone')
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'com.google.android.material:material:1.6.0'
    implementation 'androidx.multidex:multidex:2.0.1'
    implementation 'org.greenrobot:eventbus:3.3.1'
    testImplementation 'junit:junit:4.13.1'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
    implementation('com.journeyapps:zxing-android-embedded:3.6.0') { transitive = false }
    //back to 3.3.0 instead of 3.4.0 sue to https://github.com/zxing/zxing/issues/1170
    implementation 'com.google.zxing:core:3.3.0'
    implementation 'io.github.webrtc-sdk:android:125.6422.06.1'
    implementation 'com.github.joshjdevl.libsodiumjni:libsodium-jni-aar:2.0.2'
    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
 }
 tasks.register("bumpVersion") {
    description = "Increment versionCode and last segment of versionName"
    group = "versioning"
    doLast {
        bumpAppVersion(true)
    }
 }
@@ -0,0 +1,24 @@
 # WebRTC JNI
 -keep class org.webrtc.** { *; }
 -dontwarn org.webrtc.**
 # libsodium JNI
 -keep class org.libsodium.jni.** { *; }
 -dontwarn org.libsodium.jni.**
 -keepclasseswithmembernames class * {
    native <methods>;
 }
 # ZeroTier / BackOne
 -keep class com.zerotier.** { *; }
 -keep class cloud.backone.** { *; }
 -dontwarn com.zerotier.**
 # EventBus
 -keepattributes *Annotation*
 -keepclassmembers class * {
    @org.greenrobot.eventbus.Subscribe <methods>;
 }
 -keep enum org.greenrobot.eventbus.ThreadMode { *; }
 -keepattributes SourceFile,LineNumberTable
@@ -0,0 +1,26 @@
 package backone.cloud.call;
 import android.content.Context;
 import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import static org.junit.Assert.*;
 /**
 * Instrumented test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
 public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getInstrumentation().getContext();
        assertEquals("backone.cloud.call", appContext.getPackageName());
    }
 }
@@ -0,0 +1,82 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="backone.cloud.call"
    xmlns:tools="http://schemas.android.com/tools">
    <!-- Backup Import/Export -->
    <uses-feature
        android:name="android.hardware.camera"
        android:required="false" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
        android:maxSdkVersion="32" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="32" />
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <application
        android:name=".BachotApplication"
        android:allowBackup="false"
        tools:replace="android:allowBackup"
        android:icon="@drawable/logo"
        android:label="@string/app_name"
        android:roundIcon="@drawable/logo"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:exported="false"
            android:screenOrientation="portrait" />
        <activity
            android:name=".QRShowActivity"
            android:exported="false"
            android:screenOrientation="portrait" />
        <activity
            android:name=".QRScanActivity"
            android:exported="false"
            android:screenOrientation="portrait" />
        <service
            android:name=".MainService"
            android:exported="false" />
        <activity
            android:name=".StartActivity"
            android:screenOrientation="portrait"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".CallActivity"
            android:exported="false"
            android:screenOrientation="portrait"
            android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|keyboard|keyboardHidden|navigation|uiMode|density|fontScale|layoutDirection|locale" />
        <activity
            android:name=".SettingsActivity"
            android:exported="false" />
        <activity
            android:name=".AboutActivity"
            android:exported="false" />
        <activity
            android:name=".AddressActivity"
            android:exported="false" />
        <activity
            android:name=".LicenseActivity"
            android:exported="false" />
    </application>
 </manifest>
@@ -0,0 +1,674 @@
 GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
                            Preamble
  The GNU General Public License is a free, copyleft license for
 software and other kinds of works.
  The licenses for most software and other practical works are designed
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 the GNU General Public License is intended to guarantee your freedom to
 share and change all versions of a program--to make sure it remains free
 software for all its users.  We, the Free Software Foundation, use the
 GNU General Public License for most of our software; it applies also to
 any other work released this way by its authors.  You can apply it to
 your programs, too.
  When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 them if you wish), that you receive source code or can get it if you
 want it, that you can change the software or use pieces of it in new
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  To protect your rights, we need to prevent others from denying you
 these rights or asking you to surrender the rights.  Therefore, you have
 certain responsibilities if you distribute copies of the software, or if
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  For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must pass on to the recipients the same
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 or can get the source code.  And you must show them these terms so they
 know their rights.
  Developers that use the GNU GPL protect your rights with two steps:
 (1) assert copyright on the software, and (2) offer you this License
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  For the developers' and authors' protection, the GPL clearly explains
 that there is no warranty for this free software.  For both users' and
 authors' sake, the GPL requires that modified versions be marked as
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  Some devices are designed to deny users access to install or run
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  Finally, every program is threatened constantly by software patents.
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  The precise terms and conditions for copying, distribution and
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  To do so, attach the following notices to the program.  It is safest
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    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
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    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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 Also add information on how to contact you by electronic and paper mail.
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 The hypothetical commands `show w' and `show c' should show the appropriate
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@@ -0,0 +1,26 @@
 package backone.cloud.call;
 import android.content.Intent;
 import android.os.Bundle;
 import android.widget.TextView;
 public class AboutActivity extends MeshengerActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_about);
        setTitle(getResources().getString(R.string.menu_about));
        ((TextView) findViewById(R.id.versionTv)).setText(
            Utils.getApplicationVersion(this)
        );
        findViewById(R.id.licenseTV).setOnClickListener(v -> {
            Intent intent = new Intent(this, LicenseActivity.class);
            startActivity(intent);
        });
    }
 }
@@ -0,0 +1,351 @@
 package backone.cloud.call;
 import android.app.Activity;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.graphics.Color;
 import android.os.IBinder;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Spinner;
 import android.widget.TextView;
 import android.widget.Toast;
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 public class AddressActivity extends MeshengerActivity implements ServiceConnection {
    private MainService.MainBinder binder;
    Spinner storedAddressSpinner;
    Spinner systemAddressSpinner;
    Button pickStoredAddressButton;
    Button pickSystemAddressButton;
    EditText addressEditText;
    Button addButton;
    Button removeButton;
    Button saveButton;
    Button abortButton;
    List<AddressEntry> systemAddressList;
    List<AddressEntry> storedAddressList;
    AddressListAdapter storedAddressListAdapter;
    AddressListAdapter systemAddressListAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_address);
        setTitle(R.string.address_management);
        storedAddressSpinner = findViewById(R.id.StoredAddressSpinner);
        systemAddressSpinner = findViewById(R.id.SystemAddressSpinner);
        pickStoredAddressButton = findViewById(R.id.PickStoredAddressButton);
        pickSystemAddressButton = findViewById(R.id.PickSystemAddressButton);
        addressEditText = findViewById(R.id.AddressEditText);
        addButton = findViewById(R.id.AddButton);
        removeButton = findViewById(R.id.RemoveButton);
        saveButton = findViewById(R.id.SaveButton);
        abortButton = findViewById(R.id.AbortButton);
        systemAddressList = Utils.collectAddresses();
        storedAddressList = new ArrayList<>();
        storedAddressListAdapter = new AddressListAdapter(this, Color.parseColor("#39b300")); //dark green
        systemAddressListAdapter = new AddressListAdapter(this, Color.parseColor("#b3b7b2")); //light grey
        storedAddressSpinner.setAdapter(storedAddressListAdapter);
        systemAddressSpinner.setAdapter(systemAddressListAdapter);
        addressEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
                updateAddressEditTextButtons();
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // nothing to do
            }
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                updateAddressEditTextButtons();
            }
        });
        addButton.setOnClickListener((View v) -> {
            String address = addressEditText.getText().toString();
            if (address.isEmpty()) {
                return;
            }
            AddressEntry entry = parseAddress(address);
            if (entry.multicast) {
                Toast.makeText(this, "Multicast addresses are not supported.", Toast.LENGTH_SHORT).show();
                return;
            }
            if (Utils.isIP(address) && !systemAddressList.contains(entry)) {
                Toast.makeText(this, "You can only choose a IP address that is used by the system.", Toast.LENGTH_LONG).show();
                return;
            }
            storedAddressList.add(entry);
            updateSpinners();
            // select the added element
            int idx = AddressEntry.listIndexOf(storedAddressList, entry);
            storedAddressSpinner.setSelection(idx);
        });
        removeButton.setOnClickListener((View v) -> {
            String address = addressEditText.getText().toString();
            if (address.isEmpty()) {
                return;
            }
            int idx = AddressEntry.listIndexOf(storedAddressList, new AddressEntry(address, "", false));
            if (idx > -1) {
                storedAddressList.remove(idx);
                updateSpinners();
            }
        });
        pickSystemAddressButton.setOnClickListener((View v) -> {
            int pos = systemAddressSpinner.getSelectedItemPosition();
            if (pos > -1 && !systemAddressListAdapter.isEmpty()) {
                addressEditText.setText(systemAddressList.get(pos).address);
            }
        });
        pickStoredAddressButton.setOnClickListener((View v) -> {
            int pos = storedAddressSpinner.getSelectedItemPosition();
            if (pos > -1 && !storedAddressListAdapter.isEmpty()) {
                addressEditText.setText(storedAddressList.get(pos).address);
            }
        });
        saveButton.setOnClickListener((View v) -> {
            ArrayList<String> addresses = new ArrayList<>();
            for (AddressEntry ae : this.storedAddressList) {
                addresses.add(ae.address);
            }
            this.binder.getSettings().setAddresses(addresses);
            this.binder.saveDatabase();
            Toast.makeText(this, R.string.done, Toast.LENGTH_SHORT).show();
        });
        abortButton.setOnClickListener((View v) -> {
            finish();
        });
        bindService();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(this);
    }
    private void bindService() {
        // ask MainService to get us the binder object
        Intent serviceIntent = new Intent(this, MainService.class);
        bindService(serviceIntent, this, Service.BIND_AUTO_CREATE);
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        // get from settings
        for (String address : this.binder.getSettings().getAddresses()) {
            this.storedAddressList.add(parseAddress(address));
        }
        updateSpinners();
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        this.binder = null;
    }
    public class AddressListAdapter extends BaseAdapter {
        private final Activity context;
        private final int markColor;
        private List<AddressEntry> addressEntries;
        private List<AddressEntry> addressEntriesMarked;
        public AddressListAdapter(Activity context, int markColor) {
            this.context = context;
            this.markColor = markColor;
            this.addressEntries = new ArrayList<>();
            this.addressEntriesMarked = new ArrayList<>();
        }
        public boolean isEmpty() {
            return this.addressEntries.isEmpty();
        }
        public void update(List<AddressEntry> addressEntries, List<AddressEntry> addressEntriesMarked) {
            this.addressEntries = addressEntries;
            this.addressEntriesMarked = addressEntriesMarked;
        }
        @Override
        public int getCount() {
            if (isEmpty()) {
                return 1;
            }
            return addressEntries.size();
        }
        @Override
        public Object getItem(int position) {
            if (isEmpty()) {
                return null;
            }
            return addressEntries.get(position);
        }
        @Override
        public long getItemId(int position) {
            return 0;
        }
        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if (view == null) {
                LayoutInflater inflater = context.getLayoutInflater();
                view = inflater.inflate(R.layout.activity_address_item, parent, false);
            }
            TextView label = view.findViewById(R.id.label);
            if (isEmpty()) {
                label.setText(getResources().getString(R.string.empty_list_item));
                label.setTextColor(Color.BLACK);
            } else {
                AddressEntry ae = this.addressEntries.get(position);
                ArrayList<String> info = new ArrayList<>();
                if (ae.device.length() > 0) {
                    info.add(ae.device);
                }
                if (ae.multicast) {
                    info.add("multicast");
                }
                label.setText(ae.address + (info.isEmpty() ? "" : (" (" + Utils.join(info) + ")")));
                if (AddressEntry.listIndexOf(addressEntriesMarked, ae) < 0) {
                    label.setTextColor(Color.BLACK);
                } else {
                    label.setTextColor(this.markColor);
                }
            }
            return view;
        }
    }
    private void updateAddressEditTextButtons() {
        String address = addressEditText.getText().toString();
        boolean exists = (AddressEntry.findAddressEntry(storedAddressList, address) != null);
        if (exists) {
            addButton.setEnabled(false);
            removeButton.setEnabled(true);
        } else {
            removeButton.setEnabled(false);
            boolean valid = (Utils.isMAC(address) || Utils.isDomain(address) || Utils.isIP(address));
            addButton.setEnabled(valid);
        }
    }
    private void updateSpinners() {
        // compare by device first, address second
        Comparator<AddressEntry> compareAddressEntries = (AddressEntry o1, AddressEntry o2) -> {
            int dd = o1.device.compareTo(o2.device);
            if (dd == 0) {
                return o1.address.compareTo(o2.address);
            } else {
                return dd;
            }
        };
        Collections.sort(storedAddressList, compareAddressEntries);
        Collections.sort(systemAddressList, compareAddressEntries);
        storedAddressListAdapter.update(storedAddressList, systemAddressList);
        storedAddressListAdapter.notifyDataSetChanged();
        systemAddressListAdapter.update(systemAddressList, storedAddressList);
        systemAddressListAdapter.notifyDataSetChanged();
        systemAddressSpinner.setAdapter(storedAddressListAdapter);
        systemAddressSpinner.setAdapter(systemAddressListAdapter);
        pickStoredAddressButton.setEnabled(!storedAddressListAdapter.isEmpty());
        pickSystemAddressButton.setEnabled(!systemAddressListAdapter.isEmpty());
        updateAddressEditTextButtons();
    }
    /*
     * Create AddressEntry from address string.
     * Do not perform any domain lookup
    */
    AddressEntry parseAddress(String address) {
        // instead of parsing, lookup in known addresses first
        AddressEntry ae = AddressEntry.findAddressEntry(systemAddressList, address);
        if (ae != null) {
            // known address
            return new AddressEntry(address, ae.device, ae.multicast);
        } else if (Utils.isMAC(address)) {
            // MAC address
            boolean mc = Utils.isMulticastMAC(Utils.macAddressToBytes(address));
            return new AddressEntry(address, "", mc);
        } else if (Utils.isIP(address)) {
            // IP address
            boolean mc = false;
            try {
                InetSocketAddress parsed = Utils.parseInetSocketAddress(address, 0);
                if (parsed != null && parsed.getAddress() != null) {
                    mc = parsed.getAddress().isMulticastAddress();
                }
            } catch (Exception e) {
                // ignore
            }
            return new AddressEntry(address, "", mc);
        } else {
            // domain
            return new AddressEntry(address, "", false);
        }
    }
    @Override
    protected void onResume() {
        super.onResume();
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,66 @@
 package backone.cloud.call;
 import java.util.Iterator;
 import java.util.List;
 /*
 * Item for address management (AddressActivity)
 */
 public class AddressEntry implements Comparable<AddressEntry> {
    final String address;
    final String device;
    final boolean multicast;
    AddressEntry(String address, String device, boolean multicast) {
        this.address = address;
        this.device = device;
        this.multicast = multicast;
    }
    @Override
    public int compareTo(AddressEntry e) {
        return this.address.compareTo(e.address);
    }
    @Override
    public String toString() {
        return this.address;
    }
    @Override
    public boolean equals(Object other) {
        if (other instanceof AddressEntry) {
            return this.address.equals(((AddressEntry) other).address);
        } else {
            return super.equals(other);
        }
    }
    @Override
    public int hashCode() {
        return this.address.hashCode();
    }
    public static AddressEntry findAddressEntry(List<AddressEntry> list, String address) {
      for (int i = 0; i < list.size(); i += 1) {
        if (list.get(i).address.equals(address)) {
          return list.get(i); 
        }
      }
      return null;
    }
    public static int listIndexOf(List<AddressEntry> list, AddressEntry entry) {
        Iterator<AddressEntry> iter = list.listIterator();
        int i = 0;
        while(iter.hasNext()) {
            if (iter.next().address.equals(entry.address)) {
                return i;
            }
            i += 1;
        }
        return -1;
    }
 }
@@ -0,0 +1,19 @@
 package backone.cloud.call;
 import org.libsodium.jni.NaCl;
 import cloud.backone.backoneconnect.BackOneConnectApplication;
 import cloud.backone.backoneconnect.util.PlanetAssets;
 /**
 * App entry that owns the BackOne Connect GreenDAO session and initializes libsodium.
 */
 public class BachotApplication extends BackOneConnectApplication {
    @Override
    public void onCreate() {
        super.onCreate();
        // Load native sodium before any Crypto / keypair use.
        NaCl.sodium();
        PlanetAssets.ensureDefault(this);
    }
 }
@@ -0,0 +1,736 @@
 package backone.cloud.call;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.content.pm.PackageManager;
 import android.hardware.Sensor;
 import android.hardware.SensorEvent;
 import android.hardware.SensorEventListener;
 import android.media.AudioManager;
 import android.media.Ringtone;
 import android.media.RingtoneManager;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.PowerManager;
 import android.os.VibrationEffect;
 import android.os.Vibrator;
 import androidx.annotation.NonNull;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import android.os.Bundle;
 import android.view.View;
 import android.view.WindowManager;
 import android.view.animation.Animation;
 import android.view.animation.ScaleAnimation;
 import android.widget.ImageButton;
 import android.widget.TextView;
 import android.widget.Toast;
 import org.webrtc.RTCStatsCollectorCallback;
 import org.webrtc.RTCStatsReport;
 import backone.cloud.call.util.StatsReportUtil;
 public class CallActivity extends MeshengerActivity implements ServiceConnection, SensorEventListener {
    private static final int MIC_PERMISSION_REQUEST_CODE = 1;
    private TextView statusTextView;
    private TextView callStats;
    private MainService.MainBinder binder = null;
    private ServiceConnection connection;
    private RTCCall currentCall;
    private boolean calledWhileScreenOff = false;
    private PowerManager.WakeLock wakeLock;
    private PowerManager.WakeLock  passiveWakeLock = null;
    private final long buttonAnimationDuration = 400;
    private final int CAMERA_PERMISSION_REQUEST_CODE =  2;
    private boolean permissionRequested = false;
    private boolean outgoingCallPending = false;
    private Contact contact = null;
    private CallEvent.Type callEventType = null;
    private Vibrator vibrator = null;
    private Ringtone ringtone = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_call);
        // keep screen on during call; block screenshots/recents thumbnail
        getWindow().addFlags(
            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_SECURE
        );
        statusTextView = findViewById(R.id.callStatus);
        callStats = findViewById(R.id.callStats);
        TextView nameTextView = findViewById(R.id.callName);
        String action = getIntent().getAction();
        Bundle extras = getIntent().getExtras();
        if (extras == null || !extras.containsKey("EXTRA_CONTACT")) {
            log("onCreate: missing EXTRA_CONTACT");
            finish();
            return;
        }
        contact = (Contact) extras.get("EXTRA_CONTACT");
        if (contact == null) {
            log("onCreate: EXTRA_CONTACT is null");
            finish();
            return;
        }
        log("onCreate: " + action);
        if ("ACTION_OUTGOING_CALL".equals(action)) {
            callEventType = CallEvent.Type.OUTGOING_UNKNOWN;
            outgoingCallPending = true;
            connection = new ServiceConnection() {
                @Override
                public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
                    binder = (MainService.MainBinder) iBinder;
                    if (!outgoingCallPending) {
                        return;
                    }
                    startOutgoingCall();
                }
                @Override
                public void onServiceDisconnected(ComponentName componentName) {
                    // nothing to do
                }
            };
            if (contact.getName().isEmpty()) {
                nameTextView.setText(getResources().getString(R.string.unknown_caller));
            } else {
                nameTextView.setText(contact.getName());
            }
            bindService(new Intent(this, MainService.class), connection, Context.BIND_AUTO_CREATE);
            View.OnClickListener declineListener = view -> {
                // Sync teardown — hangUp()+finish() raced and aborted WebRTC natively.
                RTCCall call = resolveCall();
                currentCall = null;
                if (call != null) {
                    call.teardown(true);
                }
                callEventType = CallEvent.Type.OUTGOING_DECLINED;
                finish();
            };
            findViewById(R.id.callDecline).setOnClickListener(declineListener);
            startSensor();
        } else if ("ACTION_INCOMING_CALL".equals(action)) {
            callEventType = CallEvent.Type.INCOMING_UNKNOWN;
            calledWhileScreenOff = !((PowerManager) getSystemService(POWER_SERVICE)).isScreenOn();
            passiveWakeLock = ((PowerManager) getSystemService(POWER_SERVICE)).newWakeLock(
                PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.FULL_WAKE_LOCK, "meshenger:wakeup"
            );
            passiveWakeLock.acquire(10000);
            connection = this;
            bindService(new Intent(this, MainService.class), this, Context.BIND_AUTO_CREATE);
            if (contact.getName().isEmpty()) {
                nameTextView.setText(getResources().getString(R.string.unknown_caller));
            } else {
                nameTextView.setText(contact.getName());
            }
            findViewById(R.id.callAccept).setVisibility(View.VISIBLE);
            startRinging();
            // decline call
            View.OnClickListener declineListener = view -> {
                stopRinging();
                log("declining call...");
                RTCCall call = resolveCall();
                currentCall = null;
                if (call != null) {
                    call.teardown(true);
                }
                if (passiveWakeLock != null && passiveWakeLock.isHeld()) {
                    passiveWakeLock.release();
                }
                callEventType = CallEvent.Type.INCOMING_DECLINED;
                finish();
            };
            // hangup call
            View.OnClickListener hangupListener = view -> {
                stopRinging(); // make sure ringing has stopped ;-)
                log("hangup call...");
                RTCCall call = resolveCall();
                currentCall = null;
                if (call != null) {
                    call.teardown(true);
                }
                if (passiveWakeLock != null && passiveWakeLock.isHeld()) {
                    passiveWakeLock.release();
                }
                callEventType = CallEvent.Type.INCOMING_ACCEPTED;
                finish();
            };
            View.OnClickListener acceptListener = view -> {
                stopRinging();
                log("accepted call...");
                try {
                    RTCCall call = resolveCall();
                    if (call == null) {
                        stopDelayed("Error accepting call");
                        findViewById(R.id.callAccept).setVisibility(View.GONE);
                        callEventType = CallEvent.Type.INCOMING_ERROR;
                        return;
                    }
                    currentCall = call;
                    currentCall.setRemoteRenderer(findViewById(R.id.remoteRenderer));
                    currentCall.setLocalRenderer(findViewById(R.id.localRenderer));
                    currentCall.accept(passiveCallback);
                    if (passiveWakeLock != null && passiveWakeLock.isHeld()) {
                        passiveWakeLock.release();
                    }
                    findViewById(R.id.callDecline).setOnClickListener(hangupListener);
                    startSensor();
                } catch (Exception e) {
                    e.printStackTrace();
                    stopDelayed("Error accepting call");
                    findViewById(R.id.callAccept).setVisibility(View.GONE);
                    callEventType = CallEvent.Type.INCOMING_ERROR;
                }
            };
            findViewById(R.id.callAccept).setOnClickListener(acceptListener);
            findViewById(R.id.callDecline).setOnClickListener(declineListener);
            // Only incoming calls should finish when the peer signaling socket drops.
            LocalBroadcastManager.getInstance(this).registerReceiver(
                declineBroadcastReceiver, new IntentFilter("call_declined")
            );
        }
        findViewById(R.id.speakerMode).setOnClickListener(button -> {
            if (currentCall != null) {
                chooseVoiceMode((ImageButton)button);
            }
        });
        findViewById(R.id.videoStreamSwitch).setOnClickListener((button) -> {
           if (currentCall != null) {
               switchVideoEnabled((ImageButton)button);
           }
        });
        findViewById(R.id.frontFacingSwitch).setOnClickListener((button) -> {
            if (currentCall != null) {
                currentCall.switchFrontFacing();
            }
        });
    }
    private void startOutgoingCall() {
        if (!outgoingCallPending || binder == null || contact == null) {
            return;
        }
        if (!Utils.hasMicPermission(this)) {
            Utils.requestMicPermission(this, MIC_PERMISSION_REQUEST_CODE);
            return;
        }
        if (binder != null && !binder.isSignalingReady()) {
            stopDelayed(getString(R.string.call_error));
            callEventType = CallEvent.Type.OUTGOING_ERROR;
            outgoingCallPending = false;
            return;
        }
        try {
            Contact live = binder.getContactByPublicKey(contact.getPublicKey());
            if (live != null) {
                contact = live;
            }
            currentCall = RTCCall.startCall(
                CallActivity.this,
                binder,
                contact,
                activeCallback
            );
            if (currentCall == null) {
                stopDelayed(getString(R.string.call_error));
                callEventType = CallEvent.Type.OUTGOING_ERROR;
                outgoingCallPending = false;
                return;
            }
            currentCall.setRemoteRenderer(findViewById(R.id.remoteRenderer));
            currentCall.setLocalRenderer(findViewById(R.id.localRenderer));
            // Audio route before WebRTC AudioTrack is created on the call thread.
            try {
                AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
                if (am != null) {
                    am.setMode(AudioManager.MODE_IN_COMMUNICATION);
                    am.setSpeakerphoneOn(false);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            currentCall.startOutgoingSignaling();
            outgoingCallPending = false;
            setStatusText(getString(R.string.call_connecting));
        } catch (Exception e) {
            e.printStackTrace();
            stopDelayed(getString(R.string.call_error));
            callEventType = CallEvent.Type.OUTGOING_ERROR;
            outgoingCallPending = false;
        }
    }
    final BroadcastReceiver declineBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            log("declineBroadcastCastReceiver onReceive");
            finish();
        }
    };
    private void startRinging(){
        log("startRinging");
        int ringerMode = ((AudioManager) getSystemService(AUDIO_SERVICE)).getRingerMode();
        if (ringerMode == AudioManager.RINGER_MODE_SILENT) {
            return;
        }
        vibrator = ((Vibrator) getSystemService(VIBRATOR_SERVICE));
        long[] pattern = {1500, 800, 800, 800};
        VibrationEffect vibe = VibrationEffect.createWaveform(pattern, 0);
        vibrator.vibrate(vibe);
        if (ringerMode == AudioManager.RINGER_MODE_VIBRATE) {
            return;
        }
        ringtone = RingtoneManager.getRingtone(this, RingtoneManager.getActualDefaultRingtoneUri(getApplicationContext(), RingtoneManager.TYPE_RINGTONE));
        if (ringtone != null) {
            ringtone.play();
        }
    }
    private void stopRinging(){
        log("stopRinging");
        if (vibrator != null) {
            vibrator.cancel();
            vibrator = null;
        }
        if (ringtone != null){
            ringtone.stop();
            ringtone = null;
        }
    }
    private void chooseVoiceMode(ImageButton button) {
        AudioManager audioManager = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE);
        currentCall.setSpeakerEnabled(!currentCall.isSpeakerEnabled());
        if(currentCall.isSpeakerEnabled()) {
            audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
            audioManager.setSpeakerphoneOn(true);
            button.setAlpha(1.0f);
        } else {
            audioManager.setMode(AudioManager.MODE_NORMAL);
            audioManager.setSpeakerphoneOn(false);
            audioManager.setBluetoothScoOn(false);
            button.setAlpha(0.6f);
        }
    }
    private void switchVideoEnabled(ImageButton button) {
        if (!Utils.hasCameraPermission(this)) {
            Utils.requestCameraPermission(this, CAMERA_PERMISSION_REQUEST_CODE);
            permissionRequested = true;
            return;
        }
        currentCall.setVideoEnabled(!currentCall.isVideoEnabled());
        ScaleAnimation animation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        animation.setDuration(buttonAnimationDuration / 2);
        animation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
                // nothing to do
            }
            @Override
            public void onAnimationEnd(Animation animation) {
                if (isFinishing() || isDestroyed() || currentCall == null) {
                    return;
                }
                button.setImageResource(currentCall.isVideoEnabled() ? R.drawable.baseline_camera_alt_black_off_48 : R.drawable.baseline_camera_alt_black_48);
                Animation a = new ScaleAnimation(0.0f, 1.0f, 1.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                a.setDuration(buttonAnimationDuration / 2);
                button.startAnimation(a);
            }
            @Override
            public void onAnimationRepeat(Animation animation) {
                // nothing to do
            }
        });
        View frontSwitch = findViewById(R.id.frontFacingSwitch);
        if (currentCall.isVideoEnabled()){
            frontSwitch.setVisibility(View.VISIBLE);
            Animation scale = new ScaleAnimation(0f, 1f, 0f, 1f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
            scale.setDuration(buttonAnimationDuration);
            frontSwitch.startAnimation(scale);
        } else {
            Animation scale = new ScaleAnimation(1f, 0f, 1f, 0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
            scale.setDuration(buttonAnimationDuration);
            scale.setAnimationListener(new Animation.AnimationListener() {
                @Override
                public void onAnimationStart(Animation animation) {
                    // nothing to do
                }
                @Override
                public void onAnimationEnd(Animation animation) {
                    if (!isFinishing() && !isDestroyed()) {
                        findViewById(R.id.frontFacingSwitch).setVisibility(View.GONE);
                    }
                }
                @Override
                public void onAnimationRepeat(Animation animation) {
                    // nothing to do
                }
            });
            frontSwitch.startAnimation(scale);
        }
        button.startAnimation(animation);
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == MIC_PERMISSION_REQUEST_CODE) {
            if (!Utils.allGranted(grantResults)) {
                Toast.makeText(this, R.string.permission_mic, Toast.LENGTH_LONG).show();
                callEventType = CallEvent.Type.OUTGOING_ERROR;
                finish();
                return;
            }
            if (outgoingCallPending) {
                startOutgoingCall();
            }
            return;
        }
        if (requestCode == CAMERA_PERMISSION_REQUEST_CODE) {
            if (grantResults.length == 0 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "Camera permission needed in order to start video", Toast.LENGTH_SHORT).show();
                return;
            }
            switchVideoEnabled(findViewById(R.id.videoStreamSwitch));
        }
    }
    private void startSensor() {
        PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
        wakeLock = powerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "meshenger:proximity");
        wakeLock.acquire(10*60*1000L /*10 minutes*/);
    }
    @Override
    protected void onPause() {
        super.onPause();
        if (calledWhileScreenOff) {
            calledWhileScreenOff = false;
            return;
        }
        if (permissionRequested){
            permissionRequested = false;
        }
        //finish();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        log("onDestroy");
        try {
            LocalBroadcastManager.getInstance(this).unregisterReceiver(declineBroadcastReceiver);
        } catch (IllegalArgumentException ignored) {
            // Outgoing calls never register this receiver.
        }
        stopRinging();
        // Config change recreates the activity — do not tear down the live call.
        if (isChangingConfigurations()) {
            return;
        }
        if (currentCall != null) {
            RTCCall.CallState state = currentCall.state;
            boolean notifyPeer = state == null
                    || state == RTCCall.CallState.CONNECTING
                    || state == RTCCall.CallState.RINGING
                    || state == RTCCall.CallState.CONNECTED;
            // Stop media before releasing renderers — avoids WebRTC native abort.
            // teardown is idempotent with hangUp/decline cleanup.
            currentCall.teardown(notifyPeer);
            currentCall = null;
        } else if (binder != null && binder.getCurrentCall() != null) {
            // Decline before onServiceConnected left MainService.currentCall stuck.
            binder.getCurrentCall().teardown(true);
        }
        if (this.binder != null) {
            if (this.contact != null && this.callEventType != null) {
                this.binder.addCallEvent(this.contact, this.callEventType);
            }
            try {
                unbindService(connection);
            } catch (IllegalArgumentException ignored) {
                // Service was never bound or already unbound.
            }
            this.binder = null;
        }
        if (wakeLock != null && wakeLock.isHeld()) {
            wakeLock.release();
        }
        if (passiveWakeLock != null && passiveWakeLock.isHeld()) {
            passiveWakeLock.release();
        }
        try {
            AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
            if (am != null) {
                am.setMode(AudioManager.MODE_NORMAL);
                am.setSpeakerphoneOn(false);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private final RTCStatsCollectorCallback statsCollector = new RTCStatsCollectorCallback() {
        final StatsReportUtil statsReportUtil = new StatsReportUtil();
        @Override
        public void onStatsDelivered(RTCStatsReport rtcStatsReport) {
            String stats = statsReportUtil.getStatsReport(rtcStatsReport);
            // If you need update UI, simply do this:
            runOnUiThread(() -> {
                if (!isFinishing() && !isDestroyed() && callStats != null) {
                    callStats.setText(stats);
                }
            });
        }
    };
    private final RTCCall.OnStateChangeListener activeCallback = callState -> {
        switch (callState) {
            case CONNECTING: {
                log("activeCallback: CONNECTING");
                setStatusText(getString(R.string.call_connecting));
                break;
            }
            case CONNECTED: {
                log("activeCallback: CONNECTED");
                MainService.MainBinder b = binder;
                RTCCall call = currentCall;
                Settings settings = b != null ? b.getSettings() : null;
                boolean devMode = settings != null && settings.getDevelopmentMode();
                new Handler(getMainLooper()).post(() -> {
                    if (isFinishing() || isDestroyed()) {
                        return;
                    }
                    if (devMode && call != null) {
                        call.accept(statsCollector);
                        callStats.setVisibility(View.VISIBLE);
                    } else {
                        callStats.setVisibility(View.GONE);
                    }
                    findViewById(R.id.videoStreamSwitchLayout).setVisibility(View.VISIBLE);
                    findViewById(R.id.speakerMode).setVisibility(View.VISIBLE);
                });
                setStatusText(getString(R.string.call_connected));
                break;
            }
            case DISMISSED: {
                log("activeCallback: DISMISSED");
                stopDelayed(getString(R.string.call_denied));
                break;
            }
            case RINGING: {
                log("activeCallback: RINGING");
                setStatusText(getString(R.string.call_ringing));
                break;
            }
            case ENDED: {
                log("activeCallback: ENDED");
                stopDelayed(getString(R.string.call_ended));
                break;
            }
            case ERROR: {
                log("activeCallback: ERROR");
                stopDelayed(getString(R.string.call_error));
                break;
            }
        }
    };
    private final RTCCall.OnStateChangeListener passiveCallback = callState -> {
        switch (callState) {
            case CONNECTED: {
                log("passiveCallback: CONNECTED");
                setStatusText(getString(R.string.call_connected));
                MainService.MainBinder b = binder;
                RTCCall call = currentCall;
                Settings settings = b != null ? b.getSettings() : null;
                boolean devMode = settings != null && settings.getDevelopmentMode();
                runOnUiThread(() -> {
                    if (!isFinishing() && !isDestroyed()) {
                        findViewById(R.id.callAccept).setVisibility(View.GONE);
                    }
                });
                new Handler(getMainLooper()).post(() -> {
                    if (isFinishing() || isDestroyed()) {
                        return;
                    }
                    findViewById(R.id.videoStreamSwitchLayout).setVisibility(View.VISIBLE);
                    findViewById(R.id.speakerMode).setVisibility(View.VISIBLE);
                    if (devMode && call != null) {
                        call.accept(statsCollector);
                        callStats.setVisibility(View.VISIBLE);
                    } else {
                        callStats.setVisibility(View.GONE);
                    }
                });
                break;
            }
            case RINGING: {
                log("passiveCallback: RINGING");
                setStatusText(getString(R.string.call_ringing));
                break;
            }
            case ENDED: {
                log("passiveCallback: ENDED");
                stopDelayed(getString(R.string.call_ended));
                break;
            }
            case ERROR: {
                log("passiveCallback: ERROR");
                stopDelayed(getString(R.string.call_error));
                break;
            }
        }
    };
    private void setStatusText(String text) {
        new Handler(getMainLooper()).post(() -> {
            if (isFinishing() || isDestroyed()) {
                return;
            }
            statusTextView.setText(text);
        });
    }
    private void stopDelayed(String message) {
        new Handler(getMainLooper()).post(() -> {
            if (isFinishing() || isDestroyed()) {
                return;
            }
            statusTextView.setText(message);
            new Handler(getMainLooper()).postDelayed(() -> {
                if (!isFinishing() && !isDestroyed()) {
                    finish();
                }
            }, 2000);
        });
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        this.currentCall = this.binder.getCurrentCall();
        if (this.currentCall != null
            && "ACTION_INCOMING_CALL".equals(getIntent() != null ? getIntent().getAction() : null)) {
            // Surface peer hangup while still on the ringing screen.
            this.currentCall.setOnStateChangeListener(state -> {
                if (state == RTCCall.CallState.DISMISSED
                    || state == RTCCall.CallState.ENDED
                    || state == RTCCall.CallState.ERROR) {
                    stopRinging();
                    if (state == RTCCall.CallState.ERROR) {
                        callEventType = CallEvent.Type.INCOMING_ERROR;
                        stopDelayed(getString(R.string.call_error));
                    } else {
                        callEventType = CallEvent.Type.INCOMING_DECLINED;
                        stopDelayed(getString(R.string.call_ended));
                    }
                }
            });
        }
    }
    private RTCCall resolveCall() {
        if (currentCall != null) {
            return currentCall;
        }
        if (binder != null) {
            return binder.getCurrentCall();
        }
        return null;
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        this.binder = null;
    }
    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        // Proximity listener is not registered today; keep release-safe if that changes.
        if (sensorEvent == null || sensorEvent.values == null || sensorEvent.values.length == 0) {
            return;
        }
        log("sensor changed: " + sensorEvent.values[0]);
    }
    @Override
    public void onAccuracyChanged(Sensor sensor, int i) {
        // nothing to do
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,32 @@
 package backone.cloud.call;
 import java.net.InetAddress;
 import java.util.Date;
 class CallEvent {
    enum Type {
        OUTGOING_UNKNOWN,
        OUTGOING_ACCEPTED,
        OUTGOING_DECLINED,
        OUTGOING_MISSED,
        OUTGOING_ERROR,
        INCOMING_UNKNOWN,
        INCOMING_ACCEPTED,
        INCOMING_DECLINED,
        INCOMING_MISSED,
        INCOMING_ERROR
    }
    final byte[] pubKey;
    final InetAddress address; // may be null in case the call attempt failed
    final Type type;
    final Date date;
    CallEvent(byte[] pubKey, InetAddress address, Type type) {
        this.pubKey = pubKey;
        this.address = address;
        this.type = type;
        this.date = new Date();
    }
 }
@@ -0,0 +1,246 @@
 package backone.cloud.call;
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.json.JSONArray;
 import java.io.Serializable;
 import java.net.ConnectException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.net.SocketTimeoutException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 public class Contact implements Serializable {
    enum State { ONLINE, OFFLINE, PENDING }
    private String name;
    private byte[] pubkey;
    private boolean blocked;
    private final List<String> addresses;
    // contact state
    private State state = State.PENDING;
    // last working address (use this address next connection and for unknown contact initialization)
    private InetSocketAddress last_working_address = null;
    public Contact(String name, byte[] pubkey, List<String> addresses) {
        this.name = name;
        this.pubkey = pubkey;
        this.blocked = false;
        this.addresses = addresses;
    }
    private Contact() {
        this.name = "";
        this.pubkey = null;
        this.blocked = false;
        this.addresses = new ArrayList<>();
    }
    public State getState() {
        return state;
    }
    public void setState(State state) {
        this.state = state;
    }
    public List<String> getAddresses() {
        return this.addresses;
    }
    public void addAddress(String address) {
        if (address.isEmpty()) {
            return;
        }
        for (String addr : this.addresses) {
            if (addr.equalsIgnoreCase(address)) {
                return;
            }
        }
        this.addresses.add(address);
    }
    public List<InetSocketAddress> getAllSocketAddresses() {
        List<InetSocketAddress> addrs = new ArrayList<>();
        for (String address : this.addresses) {
            try {
                // also resolves domains
                InetSocketAddress socketAddress = Utils.parseInetSocketAddress(address, MainService.serverPort);
                if (socketAddress != null) {
                    addrs.add(socketAddress);
                }
            } catch (Exception e) {
                log("invalid address: " + address);
                e.printStackTrace();
            }
        }
        // Verified IP-as-key contacts often store the peer IP only in public_key.
        // Without this fallback, inbound works (they dial us) but outbound cannot dial.
        String identityAddress = Utils.ipv4BytesToString(this.pubkey);
        if (identityAddress != null) {
            boolean alreadyPresent = false;
            for (InetSocketAddress existing : addrs) {
                if (existing != null && existing.getAddress() != null
                    && identityAddress.equals(existing.getAddress().getHostAddress())) {
                    alreadyPresent = true;
                    break;
                }
            }
            if (!alreadyPresent) {
                InetSocketAddress identitySocket =
                    Utils.parseInetSocketAddress(identityAddress, MainService.serverPort);
                if (identitySocket != null) {
                    addrs.add(identitySocket);
                }
            }
        }
        return addrs;
    }
    public byte[] getPublicKey() {
        return pubkey;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public boolean getBlocked() {
        return blocked;
    }
    public void setBlocked(boolean blocked) {
        this.blocked = blocked;
    }
    private static Socket establishConnection(InetSocketAddress address, int timeout) {
        Socket socket = new Socket();
        try {
            // timeout to establish connection
            socket.connect(address, timeout);
            return socket;
        } catch (SocketTimeoutException e) {
            // ignore
            e.printStackTrace();
        } catch (ConnectException e) {
            // device is online, but does not listen on the given port
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (socket != null) {
            try {
                socket.close();
            } catch (Exception e) {
                // ignore
            }
        }
        return null;
    }
    /*
    * Create a connection to the contact.
    * Try/Remember the last successful address.
    */
    public Socket createSocket() {
        Socket socket = null;
        // 300ms was too aggressive on mobile/VPN links and made reachable contacts look offline.
        int connectionTimeout = 1500;
        // try last successful address first
        if (this.last_working_address != null) {
            log("try latest address: " + this.last_working_address);
            socket = establishConnection(this.last_working_address, connectionTimeout);
            if (socket != null) {
                return socket;
            }
        }
        for (InetSocketAddress address : this.getAllSocketAddresses()) {
            if (address == null) {
                continue;
            }
            log("try address: '" + address.getHostName() + "', port: " + address.getPort());
            socket = establishConnection(address, connectionTimeout);
            if (socket != null) {
                return socket;
            }
        }
        return null;
    }
    // set good address to try first next time
    public void setLastWorkingAddress(InetSocketAddress address) {
        log("setLatestWorkingAddress: " + address);
        this.last_working_address = address;
    }
    public InetSocketAddress getLastWorkingAddress() {
        return this.last_working_address;
    }
    public static JSONObject exportJSON(Contact contact, boolean all) throws JSONException {
        JSONObject object = new JSONObject();
        JSONArray array = new JSONArray();
        object.put("name", contact.name);
        object.put("public_key", Utils.byteArrayToHexString(contact.pubkey));
        for (String address : contact.getAddresses()) {
            array.put(address);
        }
        object.put("addresses", array);
        if (all) {
            object.put("blocked", contact.blocked);
        }
        return object;
    }
    public static Contact importJSON(JSONObject object, boolean all) throws JSONException {
        Contact contact = new Contact();
        contact.name = object.getString("name");
        contact.pubkey = Utils.hexStringToByteArray(object.getString("public_key"));
        if (!Utils.isValidName(contact.name)) {
            throw new JSONException("Invalid Name.");
        }
        if (contact.pubkey == null) {
            throw new JSONException("Invalid Public Key.");
        }
        JSONArray array = object.getJSONArray("addresses");
        for (int i = 0; i < array.length(); i += 1) {
            contact.addAddress(array.getString(i).toLowerCase(Locale.ROOT).trim());
        }
        if (all) {
            contact.blocked = object.getBoolean("blocked");
        }
        return contact;
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,65 @@
 package backone.cloud.call;
 import android.content.Context;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
 import java.util.List;
 class ContactListAdapter extends ArrayAdapter<Contact> {
    private final List<Contact> contacts;
    private final LayoutInflater inflater;
    public ContactListAdapter(@NonNull Context context, int resource, @NonNull List<Contact> contacts) {
        super(context, resource, contacts);
        this.contacts = contacts;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        Contact contact = contacts.get(position);
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.item_contact, null);
        }
        ((TextView) convertView.findViewById(R.id.contact_name)).setText(contact.getName());
        View waiting = convertView.findViewById(R.id.contact_waiting);
        View online = convertView.findViewById(R.id.contact_online);
        ImageView state = convertView.findViewById(R.id.contact_state);
        if (contact.getState() == Contact.State.PENDING) {
            waiting.setVisibility(View.VISIBLE);
            online.setVisibility(View.GONE);
            state.setVisibility(View.GONE);
        } else if (contact.getState() == Contact.State.ONLINE) {
            waiting.setVisibility(View.GONE);
            online.setVisibility(View.VISIBLE);
            state.setVisibility(View.GONE);
        } else {
            waiting.setVisibility(View.GONE);
            online.setVisibility(View.GONE);
            state.setVisibility(View.VISIBLE);
        }
        return convertView;
    }
 // --Commented out by Inspection START (17/07/2023 11:34):
 //    private void log(String s) {
 //        Log.d(this, s);
 //    }
 // --Commented out by Inspection STOP (17/07/2023 11:34)
 }
@@ -0,0 +1,318 @@
 package backone.cloud.call;
 import org.libsodium.jni.Sodium;
 import org.libsodium.jni.SodiumConstants;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 /**
 * Meshenger-compatible libsodium crypto for signaling and database encryption.
 * Messages: ed25519 sign + crypto_box_seal. Database: pwhash + secretbox.
 * When {@link #legacyCompatibility} is enabled, plaintext signaling is used so
 * older Bachot builds (stub crypto) can still connect.
 */
 class Crypto {
    /** When true, signaling is sent as plaintext (compatible with pre-crypto builds). */
    private static volatile boolean legacyCompatibility = true;
    public static void setLegacyCompatibility(boolean enabled) {
        legacyCompatibility = enabled;
    }
    public static boolean getLegacyCompatibility() {
        return legacyCompatibility;
    }
    public static boolean isValidSignPublicKey(byte[] publicKey) {
        return publicKey != null && publicKey.length == Sodium.crypto_sign_publickeybytes();
    }
    public static boolean isZeroKey(byte[] key) {
        if (key == null) {
            return true;
        }
        for (byte b : key) {
            if (b != 0) {
                return false;
            }
        }
        return true;
    }
    private static boolean canUseSecureMessaging(byte[] otherPublicKey, byte[] ownPublicKey, byte[] ownSecretKey) {
        return isValidSignPublicKey(otherPublicKey)
            && isValidSignPublicKey(ownPublicKey)
            && ownSecretKey != null
            && ownSecretKey.length == Sodium.crypto_sign_secretkeybytes();
    }
    public static byte[] decryptDatabase(byte[] encryptedMessage, byte[] password) {
        if (encryptedMessage == null || password == null) {
            return null;
        }
        int minLength = 4 + Sodium.crypto_pwhash_saltbytes()
            + SodiumConstants.NONCE_BYTES + SodiumConstants.MAC_BYTES;
        if (encryptedMessage.length <= minLength) {
            return null;
        }
        byte[] header = new byte[4];
        byte[] salt = new byte[Sodium.crypto_pwhash_saltbytes()];
        byte[] nonce = new byte[SodiumConstants.NONCE_BYTES];
        byte[] encryptedData = new byte[encryptedMessage.length - header.length - salt.length - nonce.length];
        System.arraycopy(encryptedMessage, 0, header, 0, header.length);
        System.arraycopy(encryptedMessage, header.length, salt, 0, salt.length);
        System.arraycopy(encryptedMessage, header.length + salt.length, nonce, 0, nonce.length);
        System.arraycopy(encryptedMessage, header.length + salt.length + nonce.length, encryptedData, 0, encryptedData.length);
        if (!(header[0] == 0 && header[1] == 0 && header[2] == 0 && header[3] == 0)) {
            return null;
        }
        byte[] key = new byte[Sodium.crypto_box_seedbytes()];
        int rc1 = Sodium.crypto_pwhash(key, key.length, password, password.length, salt,
            Sodium.crypto_pwhash_opslimit_interactive(),
            Sodium.crypto_pwhash_memlimit_interactive(),
            Sodium.crypto_pwhash_alg_default());
        byte[] decryptedData = new byte[encryptedData.length - SodiumConstants.MAC_BYTES];
        int rc2 = Sodium.crypto_secretbox_open_easy(decryptedData, encryptedData, encryptedData.length, nonce, key);
        Arrays.fill(header, (byte) 0);
        Arrays.fill(salt, (byte) 0);
        Arrays.fill(key, (byte) 0);
        Arrays.fill(nonce, (byte) 0);
        Arrays.fill(encryptedData, (byte) 0);
        if (rc1 == 0 && rc2 == 0) {
            return decryptedData;
        }
        Arrays.fill(decryptedData, (byte) 0);
        return null;
    }
    public static byte[] encryptDatabase(byte[] data, byte[] password) {
        if (data == null || password == null) {
            return null;
        }
        byte[] salt = new byte[Sodium.crypto_pwhash_saltbytes()];
        Sodium.randombytes_buf(salt, salt.length);
        byte[] key = new byte[Sodium.crypto_box_seedbytes()];
        int rc1 = Sodium.crypto_pwhash(key, key.length, password, password.length, salt,
            Sodium.crypto_pwhash_opslimit_interactive(),
            Sodium.crypto_pwhash_memlimit_interactive(),
            Sodium.crypto_pwhash_alg_default());
        byte[] header = new byte[4];
        byte[] nonce = new byte[SodiumConstants.NONCE_BYTES];
        Sodium.randombytes_buf(nonce, nonce.length);
        byte[] encryptedData = new byte[SodiumConstants.MAC_BYTES + data.length];
        int rc2 = Sodium.crypto_secretbox_easy(encryptedData, data, data.length, nonce, key);
        byte[] encryptedMessage = new byte[header.length + salt.length + nonce.length + encryptedData.length];
        System.arraycopy(header, 0, encryptedMessage, 0, header.length);
        System.arraycopy(salt, 0, encryptedMessage, header.length, salt.length);
        System.arraycopy(nonce, 0, encryptedMessage, header.length + salt.length, nonce.length);
        System.arraycopy(encryptedData, 0, encryptedMessage, header.length + salt.length + nonce.length, encryptedData.length);
        Arrays.fill(header, (byte) 0);
        Arrays.fill(salt, (byte) 0);
        Arrays.fill(key, (byte) 0);
        Arrays.fill(nonce, (byte) 0);
        Arrays.fill(encryptedData, (byte) 0);
        if (rc1 == 0 && rc2 == 0) {
            return encryptedMessage;
        }
        Arrays.fill(encryptedMessage, (byte) 0);
        return null;
    }
    public static byte[] encryptMessage(String message, byte[] otherPublicKey, byte[] ownPublicKey, byte[] ownSecretKey) {
        if (message == null) {
            return null;
        }
        // Old Bachot builds only understand plaintext JSON signaling.
        if (legacyCompatibility || !canUseSecureMessaging(otherPublicKey, ownPublicKey, ownSecretKey)) {
            return message.getBytes(StandardCharsets.UTF_8);
        }
        byte[] messageBytes = message.getBytes(StandardCharsets.UTF_8);
        byte[] signed = sign(messageBytes, ownSecretKey);
        if (signed == null) {
            return null;
        }
        byte[] data = new byte[ownPublicKey.length + signed.length];
        System.arraycopy(ownPublicKey, 0, data, 0, ownPublicKey.length);
        System.arraycopy(signed, 0, data, ownPublicKey.length, signed.length);
        byte[] sealed = seal(data, otherPublicKey);
        if (sealed != null) {
            return sealed;
        }
        // Peer key may be legacy (IP-as-key); fall back so calls still work.
        return message.getBytes(StandardCharsets.UTF_8);
    }
    /**
     * Decrypt and verify a signaling message. On success with secure crypto, writes the
     * authenticated sender ed25519 public key into {@code otherPublicKeySignOut}.
     * Legacy plaintext leaves that buffer zeroed (caller should match by address).
     */
    public static String decryptMessage(byte[] message, byte[] otherPublicKeySignOut, byte[] ownPublicKey, byte[] ownSecretKey) {
        if (otherPublicKeySignOut == null || otherPublicKeySignOut.length != Sodium.crypto_sign_publickeybytes()) {
            return null;
        }
        Arrays.fill(otherPublicKeySignOut, (byte) 0);
        if (isValidSignPublicKey(ownPublicKey)
            && ownSecretKey != null
            && ownSecretKey.length == Sodium.crypto_sign_secretkeybytes()) {
            String secure = decryptSecure(message, otherPublicKeySignOut, ownPublicKey, ownSecretKey);
            if (secure != null) {
                return secure;
            }
            Arrays.fill(otherPublicKeySignOut, (byte) 0);
        }
        // IP-as-key / null-secret identities always use plaintext (verified fleet).
        if (!legacyCompatibility && !isLegacyIdentity(ownPublicKey, ownSecretKey)) {
            return null;
        }
        return decryptLegacyPlaintext(message);
    }
    /** Verified IP-as-key peers have a 4-byte pubkey and no ed25519 secret. */
    public static boolean isLegacyIdentity(byte[] ownPublicKey, byte[] ownSecretKey) {
        if (ownSecretKey == null || ownSecretKey.length == 0) {
            return true;
        }
        return ownPublicKey != null && ownPublicKey.length == 4;
    }
    private static String decryptSecure(byte[] message, byte[] otherPublicKeySignOut, byte[] ownPublicKey, byte[] ownSecretKey) {
        byte[] messageData = unseal(message, ownPublicKey, ownSecretKey);
        if (messageData == null || messageData.length <= otherPublicKeySignOut.length) {
            return null;
        }
        byte[] messageSignedData = new byte[messageData.length - otherPublicKeySignOut.length];
        System.arraycopy(messageData, 0, otherPublicKeySignOut, 0, otherPublicKeySignOut.length);
        System.arraycopy(messageData, otherPublicKeySignOut.length, messageSignedData, 0, messageSignedData.length);
        byte[] unsignedData = unsign(messageSignedData, otherPublicKeySignOut);
        if (unsignedData == null) {
            return null;
        }
        return new String(unsignedData, StandardCharsets.UTF_8);
    }
    private static String decryptLegacyPlaintext(byte[] message) {
        if (message == null || message.length == 0) {
            return null;
        }
        String plain = new String(message, StandardCharsets.UTF_8).trim();
        // Old builds send raw JSON like {"action":"call",...}
        if (plain.startsWith("{") && plain.contains("\"action\"")) {
            return plain;
        }
        return null;
    }
    private static byte[] sign(byte[] data, byte[] secretKey) {
        if (data == null) {
            return null;
        }
        if (secretKey == null || secretKey.length != Sodium.crypto_sign_secretkeybytes()) {
            return null;
        }
        byte[] signedMessage = new byte[Sodium.crypto_sign_bytes() + data.length];
        final int[] signedMessageLen = new int[1];
        int rc = Sodium.crypto_sign(signedMessage, signedMessageLen, data, data.length, secretKey);
        if (rc == 0 && signedMessage.length == signedMessageLen[0]) {
            return signedMessage;
        }
        return null;
    }
    private static byte[] unsign(byte[] signedMessage, byte[] publicKey) {
        if (signedMessage == null || signedMessage.length < Sodium.crypto_sign_bytes()) {
            return null;
        }
        if (publicKey == null || publicKey.length != Sodium.crypto_sign_publickeybytes()) {
            return null;
        }
        byte[] unsignedMessage = new byte[signedMessage.length - Sodium.crypto_sign_bytes()];
        final int[] messageSize = new int[1];
        int rc = Sodium.crypto_sign_open(unsignedMessage, messageSize, signedMessage, signedMessage.length, publicKey);
        if (rc == 0 && unsignedMessage.length == messageSize[0]) {
            return unsignedMessage;
        }
        return null;
    }
    private static byte[] seal(byte[] data, byte[] pkSign) {
        if (data == null) {
            return null;
        }
        if (pkSign == null || pkSign.length != Sodium.crypto_sign_publickeybytes()) {
            return null;
        }
        byte[] pkBox = new byte[Sodium.crypto_box_publickeybytes()];
        int rc1 = Sodium.crypto_sign_ed25519_pk_to_curve25519(pkBox, pkSign);
        if (rc1 != 0 || pkBox.length != Sodium.crypto_box_publickeybytes()) {
            return null;
        }
        byte[] ciphertext = new byte[SodiumConstants.SEAL_BYTES + data.length];
        int rc = Sodium.crypto_box_seal(ciphertext, data, data.length, pkBox);
        if (rc == 0) {
            return ciphertext;
        }
        return null;
    }
    private static byte[] unseal(byte[] ciphertext, byte[] pkSign, byte[] skSign) {
        if (ciphertext == null || ciphertext.length < SodiumConstants.SEAL_BYTES) {
            return null;
        }
        if (pkSign == null || pkSign.length != Sodium.crypto_sign_publickeybytes()) {
            return null;
        }
        if (skSign == null || skSign.length != Sodium.crypto_sign_secretkeybytes()) {
            return null;
        }
        byte[] pkBox = new byte[Sodium.crypto_box_publickeybytes()];
        byte[] skBox = new byte[Sodium.crypto_box_secretkeybytes()];
        int rc1 = Sodium.crypto_sign_ed25519_pk_to_curve25519(pkBox, pkSign);
        int rc2 = Sodium.crypto_sign_ed25519_sk_to_curve25519(skBox, skSign);
        if (rc1 != 0 || rc2 != 0) {
            return null;
        }
        byte[] decrypted = new byte[ciphertext.length - SodiumConstants.SEAL_BYTES];
        int rc = Sodium.crypto_box_seal_open(decrypted, ciphertext, ciphertext.length, pkBox, skBox);
        if (rc == 0) {
            return decrypted;
        }
        return null;
    }
 }
@@ -0,0 +1,164 @@
 package backone.cloud.call;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Arrays;
 class Database {
    Settings settings;
    final ArrayList<Contact> contacts;
    static String version = "3.0.3"; // current version
    Database() {
        this.contacts = new ArrayList<>();
        this.settings = new Settings();
    }
    public void addContact(Contact contact) {
        int idx = findContact(contact.getPublicKey());
        if (idx >= 0) {
            // contact exists - replace
            this.contacts.set(idx, contact);
        } else {
            this.contacts.add(contact);
        }
    }
    public void deleteContact(byte[] publicKey) {
        int idx = this.findContact(publicKey);
        if (idx >= 0) {
            this.contacts.remove(idx);
        }
    }
    public int findContact(byte[] publicKey) {
        for (int i = 0; i < this.contacts.size(); i += 1) {
            if (Arrays.equals(this.contacts.get(i).getPublicKey(), publicKey)) {
                return i;
            }
        }
        return -1;
    }
    public void onDestroy() {
        // zero keys from memory
        if (this.settings.getSecretKey() != null) {
            Arrays.fill(this.settings.getSecretKey(), (byte) 0);
        }
        if (this.settings.getPublicKey() != null) {
            Arrays.fill(this.settings.getPublicKey(), (byte) 0);
        }
        for (Contact contact : this.contacts) {
            if (contact.getPublicKey() != null) {
                Arrays.fill(contact.getPublicKey(), (byte) 0);
            }
        }
    }
    public static Database load(String path, String password) throws IOException, JSONException {
        // read database file
        byte[] data = Utils.readExternalFile(path);
        // encrypt database
        if (password != null && password.length() > 0) {
            data = Crypto.decryptDatabase(data, password.getBytes());
            if (data == null) {
                throw new IOException("wrong database password.");
            }
        }
        JSONObject obj = new JSONObject(
            new String(data, StandardCharsets.UTF_8)
        );
        boolean upgraded = upgradeDatabase(obj.getString("version"), Database.version, obj);
        Database db = Database.fromJSON(obj);
        if (upgraded) {
            log("store updated database");
            Database.store(path, db, password);
        }
        return db;
    }
    public static void store(String path, Database db, String password) throws IOException, JSONException {
        JSONObject obj = Database.toJSON(db);
        byte[] data = obj.toString().getBytes();
        // encrypt database
        if (password != null && password.length() > 0) {
            data = Crypto.encryptDatabase(data, password.getBytes());
        }
        // write database file
        Utils.writeExternalFile(path, data);
    }
    private static boolean upgradeDatabase(String from, String to, JSONObject obj) throws JSONException {
        if (from.equals(to)) {
            return false;
        }
        log("upgrade database from " + from + " to " + to);
        // 3.0.2 => 3.0.3
        if (from.equals("3.0.2")) {
            // nothing to do
            from = "3.0.3";
        }
        obj.put("version", from);
        return true;
    }
    public static JSONObject toJSON(Database db) throws JSONException {
        JSONObject obj = new JSONObject();
        obj.put("version", version);
        obj.put("settings", Settings.exportJSON(db.settings));
        JSONArray contacts = new JSONArray();
        for (Contact contact : db.contacts) {
            contacts.put(Contact.exportJSON(contact, true));
        }
        obj.put("contacts", contacts);
        return obj;
    }
    public static Database fromJSON(JSONObject obj) throws JSONException {
        Database db = new Database();
        // import version
        version = obj.getString("version");
        // import contacts
        JSONArray array = obj.getJSONArray("contacts");
        for (int i = 0; i < array.length(); i += 1) {
            db.contacts.add(
                Contact.importJSON(array.getJSONObject(i), true)
            );
        }
        // import settings
        JSONObject settings = obj.getJSONObject("settings");
        db.settings = Settings.importJSON(settings);
        return db;
    }
    private static void log(String s) {
        Log.d("Database", s);
    }
 }
@@ -0,0 +1,65 @@
 package backone.cloud.call;
 import org.webrtc.DataChannel;
 import org.webrtc.IceCandidate;
 import org.webrtc.MediaStream;
 import org.webrtc.PeerConnection;
 import org.webrtc.RtpReceiver;
 class DefaultObserver implements PeerConnection.Observer {
    @Override
    public void onSignalingChange(PeerConnection.SignalingState signalingState) {
    }
    @Override
    public void onIceConnectionChange(PeerConnection.IceConnectionState iceConnectionState) {
    }
    @Override
    public void onIceConnectionReceivingChange(boolean b) {
    }
    @Override
    public void onIceGatheringChange(PeerConnection.IceGatheringState iceGatheringState) {
    }
    @Override
    public void onIceCandidate(IceCandidate iceCandidate) {
    }
    @Override
    public void onIceCandidatesRemoved(IceCandidate[] iceCandidates) {
    }
    @Override
    public void onAddStream(MediaStream mediaStream) {
    }
    @Override
    public void onRemoveStream(MediaStream mediaStream) {
    }
    @Override
    public void onDataChannel(DataChannel dataChannel) {
    }
    @Override
    public void onRenegotiationNeeded() {
    }
    @Override
    public void onAddTrack(RtpReceiver rtpReceiver, MediaStream[] mediaStreams) {
    }
 }
@@ -0,0 +1,27 @@
 package backone.cloud.call;
 import org.webrtc.SdpObserver;
 import org.webrtc.SessionDescription;
 class DefaultSdpObserver implements SdpObserver {
    @Override
    public void onCreateSuccess(SessionDescription sessionDescription) {
        // nothing to do
    }
    @Override
    public void onSetSuccess() {
        // nothing to do
    }
    @Override
    public void onCreateFailure(String s) {
        // nothing to do
    }
    @Override
    public void onSetFailure(String s) {
        // nothing to do
    }
 }
@@ -0,0 +1,124 @@
 package backone.cloud.call;
 import android.content.Context;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import android.text.format.DateUtils;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.List;
 class EventListAdapter extends ArrayAdapter<CallEvent> {
    private final LayoutInflater inflater;
    private List<CallEvent> events;
    private List<Contact> contacts;
    private final Context context;
    public EventListAdapter(@NonNull Context context, int resource, List<CallEvent> events, List<Contact> contacts) {
        super(context, resource, events);
        this.events = events;
        this.contacts = contacts;
        this.context = context;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    public void update(List<CallEvent> events, List<Contact> contacts) {
        this.events = events;
        this.contacts = contacts;
    }
    @Override
    public int getCount() {
        return events.size();
    }
    @Override
    public CallEvent getItem(int position) {
        return events.get(position);
    }
    @Override
    public long getItemId(int position) {
        return 0;
    }
    @NonNull
    @Override
    public View getView(int position, @Nullable View view, @NonNull ViewGroup parent) {
        // show list in reverse, latest element first
        CallEvent event = this.events.get(this.events.size() - position - 1);
        if (view == null) {
            view = inflater.inflate(R.layout.item_event, null);
        }
        // find name
        String name = "";
        for (Contact contact : this.contacts) {
            if (Arrays.equals(contact.getPublicKey(), event.pubKey)) {
                name = contact.getName();
                break;
            }
        }
        TextView name_tv = view.findViewById(R.id.call_name);
        if (name.isEmpty()) {
            name_tv.setText(this.context.getResources().getString(R.string.unknown_caller));
        } else {
            name_tv.setText(name);
        }
        TextView date_tv = view.findViewById(R.id.call_date);
        if (DateUtils.isToday(event.date.getTime())) {
            SimpleDateFormat ft = new SimpleDateFormat("'Today at' hh:mm:ss");
            date_tv.setText(ft.format(event.date));
        } else {
            SimpleDateFormat ft = new SimpleDateFormat("yyyy.MM.dd 'at' hh:mm:ss");
            date_tv.setText(ft.format(event.date));
        }
        ImageView type_iv = view.findViewById(R.id.call_type);
        switch (event.type) {
            case INCOMING_ACCEPTED:
            case INCOMING_DECLINED:
                type_iv.setImageResource(R.drawable.call_incoming);
                break;
            case INCOMING_UNKNOWN:
            case INCOMING_MISSED:
            case INCOMING_ERROR:
                type_iv.setImageResource(R.drawable.call_incoming_missed);
                break;
            case OUTGOING_ACCEPTED:
            case OUTGOING_DECLINED:
                type_iv.setImageResource(R.drawable.call_outgoing);
                break;
            case OUTGOING_UNKNOWN:
            case OUTGOING_MISSED:
            case OUTGOING_ERROR:
                type_iv.setImageResource(R.drawable.call_outgoing_missed);
                break;
        }
        TextView address_tv = view.findViewById(R.id.call_address);
        if (event.address != null) {
            address_tv.setText("(" + event.address.getHostAddress() + ")");
        } else {
            address_tv.setText("");
        }
        return view;
    }
    private static void log(String s) {
        Log.d(EventListAdapter.class.getSimpleName(), s);
    }
 }
@@ -0,0 +1,201 @@
 package backone.cloud.call;
 import android.app.Dialog;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.os.Handler;
 import androidx.annotation.Nullable;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import androidx.fragment.app.Fragment;
 import androidx.appcompat.widget.PopupMenu;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ListView;
 import android.widget.Toast;
 import java.net.InetSocketAddress;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import static android.os.Looper.getMainLooper;
 public class EventListFragment extends Fragment implements AdapterView.OnItemClickListener {
    private MainActivity mainActivity;
    private ListView eventListView;
    private EventListAdapter eventListAdapter;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_event_list, container, false);
        mainActivity = (MainActivity) getActivity();
        eventListView = view.findViewById(R.id.eventList);
        FloatingActionButton fabDelete = view.findViewById(R.id.fabDelete);
        fabDelete.setOnClickListener(v -> {
            mainActivity.binder.clearEvents();
            refreshEventList();
        });
        eventListAdapter = new EventListAdapter(mainActivity, R.layout.item_event, Collections.emptyList(), Collections.emptyList());
        eventListView.setAdapter(eventListAdapter);
        eventListView.setOnItemClickListener(this);
        return view;
    }
    void refreshEventList() {
        log("refreshEventList");
        if (this.mainActivity == null || this.mainActivity.binder == null) {
            log("refreshEventList early return");
            return;
        }
        List<CallEvent> events = EventListFragment.this.mainActivity.binder.getEventsCopy();
        List<Contact> contacts = EventListFragment.this.mainActivity.binder.getContactsCopy();
        new Handler(getMainLooper()).post(() -> {
            log("refreshEventList update: " + events.size());
            eventListAdapter.update(events, contacts);
            eventListAdapter.notifyDataSetChanged();
            eventListView.setAdapter(eventListAdapter);
            eventListView.setOnItemLongClickListener((AdapterView<?> adapterView, View view, int i, long l) -> {
                CallEvent event = events.get(i);
                PopupMenu menu = new PopupMenu(EventListFragment.this.mainActivity, view);
                Resources res = getResources();
                String add = res.getString(R.string.add);
                String block = res.getString(R.string.block);
                String unblock = res.getString(R.string.unblock);
                String qr = "QR-ify";
                Contact contact = EventListFragment.this.mainActivity.binder.getContactByPublicKey(event.pubKey);
                // allow to add unknown caller
                if (contact == null) {
                    menu.getMenu().add(add);
                }
                // we can only block/unblock contacts
                // (or we need to need maintain a separate bocklist)
                if (contact != null) {
                    if (contact.getBlocked()) {
                        menu.getMenu().add(unblock);
                    } else {
                        menu.getMenu().add(block);
                    }
                }
                menu.setOnMenuItemClickListener((MenuItem menuItem) -> {
                    String title = menuItem.getTitle().toString();
                    if (title.equals(add)) {
                        showAddDialog(event);
                    } else if (title.equals(block)) {
                        setBlocked(event, true);
                    } else if (title.equals(unblock)) {
                        setBlocked(event, false);
                    }
                    return false;
                });
                menu.show();
                return true;
            });
        });
    }
    private void setBlocked(CallEvent event, boolean blocked) {
        Contact contact = EventListFragment.this.mainActivity.binder.getContactByPublicKey(event.pubKey);
        if (contact != null) {
            contact.setBlocked(blocked);
            mainActivity.binder.saveDatabase();
        } else {
            // unknown contact
        }
    }
    private void showAddDialog(CallEvent event) {
        log("showAddDialog");
        Dialog dialog = new Dialog(this.mainActivity);
        dialog.setContentView(R.layout.dialog_add_contact);
        EditText nameEditText = dialog.findViewById(R.id.nameEditText);
        Button exitButton = dialog.findViewById(R.id.ExitButton);
        Button okButton = dialog.findViewById(R.id.OkButton);
        okButton.setOnClickListener((View v) -> {
            String name = nameEditText.getText().toString();
            if (name.isEmpty()) {
                Toast.makeText(this.mainActivity, R.string.contact_name_empty, Toast.LENGTH_SHORT).show();
                return;
            }
            if (EventListFragment.this.mainActivity.binder.getContactByName(name) != null) {
                Toast.makeText(this.mainActivity, R.string.contact_name_exists, Toast.LENGTH_LONG).show();
                return;
            }
            String address = Utils.getGeneralizedAddress(event.address);
            if (address.isEmpty()) {
                Toast.makeText(this.mainActivity, R.string.contact_has_no_address_warning, Toast.LENGTH_LONG).show();
                return;
            }
            EventListFragment.this.mainActivity.binder.addContact(
                new Contact(name, event.pubKey, Collections.singletonList(address))
            );
            Toast.makeText(this.mainActivity, R.string.done, Toast.LENGTH_SHORT).show();
            refreshEventList();
            // close dialog
            dialog.dismiss();
        });
        exitButton.setOnClickListener((View v) -> {
            dialog.dismiss();
        });
        dialog.show();
    }
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        log("onItemClick");
        CallEvent event = this.eventListAdapter.getItem(i);
        if (event == null || event.address == null) {
            return;
        }
        String address = Utils.getGeneralizedAddress(event.address);
        if (address.isEmpty()) {
            return;
        }
        Contact contact = new Contact("", event.pubKey, Collections.singletonList(address));
        InetSocketAddress socketAddress = Utils.parseInetSocketAddress(address, MainService.serverPort);
        if (socketAddress != null) {
            contact.setLastWorkingAddress(socketAddress);
        }
        Intent intent = new Intent(this.mainActivity, CallActivity.class);
        intent.setAction("ACTION_OUTGOING_CALL");
        intent.putExtra("EXTRA_CONTACT", contact);
        startActivity(intent);
    }
    public void onServiceConnected() {
        refreshEventList();
    }
    private static void log(String s) {
        Log.d(EventListFragment.class.getSimpleName(), s);
    }
 }
@@ -0,0 +1,40 @@
 package backone.cloud.call;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 public class LicenseActivity extends MeshengerActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_license);
        setTitle(getResources().getString(R.string.menu_license));
        // reading the license file can be slow => use a thread
        new Thread(() -> {
            try {
                StringBuffer buffer = new StringBuffer();
                BufferedReader reader = new BufferedReader(new InputStreamReader(getAssets().open("license.txt")));
                String line;
                while((line = reader.readLine()) != null) {
                    buffer.append(line.trim() + "\n");
                }
                reader.close();
                runOnUiThread(() -> {
                    findViewById(R.id.licenseLoadingBar).setVisibility(View.GONE);
                    ((TextView)findViewById(R.id.licenceText)).setText(buffer.toString());
                });
            } catch (IOException e) {
                e.printStackTrace();
            }
        }).start();
    }
 }
@@ -0,0 +1,21 @@
 package backone.cloud.call;
 /*
 * Wrapper for android.util.Log to disable logging
 */
 public class Log {
    private static String contextString(Object context) {
        if (context instanceof String) {
            return (String) context;
        } else {
            return context.getClass().getSimpleName();
        }
    }
    public static void d(Object context, String message) {
        if (BuildConfig.DEBUG) {
            String tag = contextString(context);
            android.util.Log.d(tag, message);
        }
    }
 }
@@ -0,0 +1,609 @@
 package backone.cloud.call;
 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.content.res.Resources;
 import android.media.AudioManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
 import androidx.annotation.NonNull;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import androidx.appcompat.app.AlertDialog;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 import android.os.Looper;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.AnimationSet;
 import android.view.animation.TranslateAnimation;
 import android.widget.AdapterView;
 import android.widget.EditText;
 import android.widget.ListView;
 import android.widget.PopupMenu;
 import android.widget.TextView;
 import android.widget.Toast;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 import org.json.JSONException;
 import android.net.VpnService;
 import cloud.backone.backoneconnect.BackOneConnectApplication;
 import cloud.backone.backoneconnect.events.NodeStatusEvent;
 import cloud.backone.backoneconnect.events.RequestNodeStatusEvent;
 import cloud.backone.backoneconnect.model.Network;
 import cloud.backone.backoneconnect.model.NetworkDao;
 import cloud.backone.backoneconnect.service.ZeroTierOneService;
 import com.zerotier.sdk.NodeStatus;
 import java.util.List;
 // the main view with tabs
 public class MainActivity extends MeshengerActivity implements ServiceConnection, AdapterView.OnItemClickListener {
    private static final int MIC_PERMISSION_REQUEST_CODE = 2;
    private static final long STATUS_REFRESH_INTERVAL_MS = 30_000L;
    /** Ignore brief ZeroTier EVENT_OFFLINE flaps while the TUN interface is still up. */
    private static final long VPN_OFFLINE_DEBOUNCE_MS = 8_000L;
    public MainService.MainBinder binder;
    private ListView contactListView;
    private TextView ownStatusText;
    private boolean fabExpanded = false;
    private FloatingActionButton fabScan;
    private FloatingActionButton fabGen;
    private FloatingActionButton fab;
    SwipeRefreshLayout swipeRefreshLayout;
    private boolean serviceBound = false;
    private boolean activityResumed = false;
    private boolean vpnOnline = false;
    private final EventBus eventBus = EventBus.getDefault();
    private final Handler statusRefreshHandler = new Handler(Looper.getMainLooper());
    private final Runnable vpnOfflineRunnable = () -> {
        // Only show offline after debounce if the TUN interface is really gone.
        if (Utils.getFirstTunIpv4() == null) {
            vpnOnline = false;
            updateOwnStatusText();
        } else {
            vpnOnline = true;
            updateOwnStatusText();
        }
    };
    private final Runnable statusRefreshRunnable = new Runnable() {
        @Override
        public void run() {
            refreshContactStatuses();
            refreshVpnFromTunnel();
            statusRefreshHandler.postDelayed(this, STATUS_REFRESH_INTERVAL_MS);
        }
    };
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        log("onItemClick");
        if (binder == null) {
            return;
        }
        List<Contact> contacts = binder.getContactsCopy();
        if (i < 0 || i >= contacts.size()) {
            return;
        }
        Contact contact = contacts.get(i);
        if (!Utils.hasMicPermission(this)) {
            Utils.requestMicPermission(this, MIC_PERMISSION_REQUEST_CODE);
            return;
        }
        Intent intent = new Intent(this, CallActivity.class);
        intent.setAction("ACTION_OUTGOING_CALL");
        intent.putExtra("EXTRA_CONTACT", contact);
        startActivity(intent);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        log("onCreate");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fab = findViewById(R.id.fab);
        fabScan = findViewById(R.id.fabScan);
        fabGen = findViewById(R.id.fabGenerate);
        contactListView = findViewById(R.id.contactList);
        ownStatusText = findViewById(R.id.ownStatusText);
        swipeRefreshLayout = findViewById(R.id.swipe_refresh);
        swipeRefreshLayout.setOnRefreshListener(() -> refreshContactStatuses());
        fabScan.setOnClickListener(v -> startActivity(new Intent(this, QRScanActivity.class)));
        fabGen.setOnClickListener(v -> startActivity(new Intent(this, QRShowActivity.class)));
        fab.setOnClickListener(this::runFabAnimation);
        // ask for audio recording permissions
        if (!Utils.hasMicPermission(this)) {
            Utils.requestMicPermission(this, MIC_PERMISSION_REQUEST_CODE);
        }
        LocalBroadcastManager.getInstance(this).registerReceiver(refreshContactListReceiver, new IntentFilter("refresh_contact_list"));
        LocalBroadcastManager.getInstance(this).registerReceiver(ownStatusReceiver, new IntentFilter(MainService.ACTION_OWN_STATUS_CHANGED));
    }
    private void refreshContactStatuses() {
        if (!activityResumed || binder == null) {
            stopSwipeRefresh();
            return;
        }
        binder.checkOwnConnectivity();
        binder.pingContacts();
        eventBus.post(new RequestNodeStatusEvent());
        statusRefreshHandler.removeCallbacks(refreshTimeoutRunnable);
        statusRefreshHandler.postDelayed(refreshTimeoutRunnable, 15_000L);
    }
    private final Runnable refreshTimeoutRunnable = () -> stopSwipeRefresh();
    private void stopSwipeRefresh() {
        if (swipeRefreshLayout != null) {
            swipeRefreshLayout.setRefreshing(false);
        }
    }
    private void updateOwnStatusText() {
        if (ownStatusText == null || !activityResumed) {
            return;
        }
        String signaling;
        if (binder == null) {
            signaling = getString(R.string.own_status_checking);
        } else {
            switch (binder.getOwnStatus()) {
                case LISTENING:
                    signaling = getString(R.string.own_status_ready);
                    break;
                case IN_CALL:
                    signaling = getString(R.string.own_status_in_call);
                    break;
                case NOT_LISTENING:
                    signaling = getString(R.string.own_status_not_listening);
                    break;
                default:
                    signaling = getString(R.string.own_status_checking);
                    break;
            }
        }
        String vpn = vpnOnline
            ? getString(R.string.own_status_vpn_online)
            : getString(R.string.own_status_vpn_offline);
        ownStatusText.setText(signaling + " · " + vpn);
    }
    void refreshContactList() {
        log("refreshContactList");
        if (binder == null) {
            return;
        }
        new Handler(getMainLooper()).post(() -> {
            if (binder == null || contactListView == null) {
                return;
            }
            List<Contact> contacts = binder.getContactsCopy();
            contactListView.setAdapter(new ContactListAdapter(this, R.layout.item_contact, contacts));
            contactListView.setOnItemClickListener(this);
            contactListView.setOnItemLongClickListener((AdapterView<?> adapterView, View view, int i, long l) -> {
                if (i < 0 || i >= contacts.size()) {
                    return true;
                }
                Contact contact = contacts.get(i);
                PopupMenu menu = new PopupMenu(this, view);
                Resources res = getResources();
                String delete = res.getString(R.string.delete);
                String rename = res.getString(R.string.rename);
                String block = res.getString(R.string.block);
                String unblock = res.getString(R.string.unblock);
                String share = res.getString(R.string.share);
                String qr = "QR-ify";
                menu.getMenu().add(delete);
                menu.getMenu().add(rename);
                menu.getMenu().add(share);
                if (contact.getBlocked()) {
                    menu.getMenu().add(unblock);
                } else {
                    menu.getMenu().add(block);
                }
                menu.getMenu().add(qr);
                menu.setOnMenuItemClickListener((MenuItem menuItem) -> {
                    String title = menuItem.getTitle().toString();
                    byte[] publicKey = contact.getPublicKey();
                    if (title.equals(delete)) {
                        showDeleteDialog(publicKey, contact.getName());
                    } else if (title.equals(rename)) {
                        showContactEditDialog(publicKey, contact.getName());
                    } else if (title.equals(share)) {
                        shareContact(contact);
                    } else if (title.equals(block)) {
                        setBlocked(publicKey, true);
                    } else if (title.equals(unblock)) {
                        setBlocked(publicKey, false);
                    } else if (title.equals(qr)) {
                        Intent intent = new Intent(this, QRShowActivity.class);
                        intent.putExtra("EXTRA_CONTACT", contact);
                        startActivity(intent);
                    }
                    return false;
                });
                menu.show();
                return true;
            });
            stopSwipeRefresh();
        });
    }
    private void showDeleteDialog(byte[] publicKey, String name) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.confirm);
        builder.setMessage(getResources().getString(R.string.contact_remove) + " " + name);
        builder.setCancelable(false); // prevent key shortcut to cancel dialog
        builder.setPositiveButton(R.string.yes, (DialogInterface dialog, int id) -> {
            binder.deleteContact(publicKey);
            dialog.cancel();
        });
        builder.setNegativeButton(R.string.no, (DialogInterface dialog, int id) -> {
            dialog.cancel();
        });
        // create dialog box
        AlertDialog alert = builder.create();
        alert.show();
    }
    private void setBlocked(byte[] publicKey, boolean blocked) {
        Contact contact = binder.getContactByPublicKey(publicKey);
        if (contact != null) {
            contact.setBlocked(blocked);
            binder.addContact(contact);
        }
    }
    private void shareContact(Contact c) {
        log("shareContact");
        try {
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setType("text/plain");
            intent.putExtra(Intent.EXTRA_TEXT, Contact.exportJSON(c, false).toString());
            startActivity(intent);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    private void showContactEditDialog(byte[] publicKey, String name) {
        log("showContactEditDialog");
        EditText et = new EditText(this);
        et.setText(name);
        AlertDialog dialog = new AlertDialog.Builder(this)
                .setTitle(R.string.contact_edit)
                .setView(et)
                .setNegativeButton(getResources().getString(R.string.cancel), null)
                .setPositiveButton(R.string.ok, (DialogInterface dialogInterface, int i) -> {
                    String newName = et.getText().toString();
                    if (newName.length() > 0) {
                        Contact contact = binder.getContactByPublicKey(publicKey);
                        if (contact != null) {
                            contact.setName(newName);
                            binder.addContact(contact);
                        }
                    }
                }).show();
    }
    private void runFabAnimation(View fab) {
        log("runFabAnimation");
        AnimationSet scanSet = new AnimationSet(this, null);
        AnimationSet generateSet = new AnimationSet(this, null);
        final int distance = 200;
        final int duration = 300;
        TranslateAnimation scanAnimation;
        TranslateAnimation generateAnimnation;
        AlphaAnimation alphaAnimation;
        if (fabExpanded) {
            scanAnimation = new TranslateAnimation(0, 0, -distance, 0);
            generateAnimnation = new TranslateAnimation(0, 0, -distance * 2, 0);
            alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
            ((FloatingActionButton) fab).setImageResource(R.drawable.qr_glass);
            fabScan.setY(fabScan.getY() + distance);
            fabGen.setY(fabGen.getY() + distance * 2);
        } else {
            scanAnimation = new TranslateAnimation(0, 0, distance, 0);
            generateAnimnation = new TranslateAnimation(0, 0, distance * 2, 0);
            alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
            ((FloatingActionButton) fab).setImageResource(android.R.drawable.ic_menu_close_clear_cancel);
            fabScan.setY(fabScan.getY() - distance);
            fabGen.setY(fabGen.getY() - distance * 2);
        }
        scanSet.addAnimation(scanAnimation);
        scanSet.addAnimation(alphaAnimation);
        scanSet.setFillAfter(true);
        generateSet.addAnimation(generateAnimnation);
        generateSet.addAnimation(alphaAnimation);
        generateSet.setFillAfter(true);
        scanSet.setDuration(duration);
        generateSet.setDuration(duration);
        fabScan.show();
        fabGen.show();
        fabScan.startAnimation(scanSet);
        fabGen.startAnimation(generateSet);
        fabExpanded = !fabExpanded;
    }
    @Override
    protected void onDestroy() {
        log("onDestroy");
        activityResumed = false;
        statusRefreshHandler.removeCallbacks(statusRefreshRunnable);
        statusRefreshHandler.removeCallbacks(refreshTimeoutRunnable);
        if (serviceBound) {
            try {
                unbindService(this);
            } catch (IllegalArgumentException ignored) {
            }
            serviceBound = false;
            binder = null;
        }
        LocalBroadcastManager.getInstance(this).unregisterReceiver(refreshContactListReceiver);
        try {
            LocalBroadcastManager.getInstance(this).unregisterReceiver(ownStatusReceiver);
        } catch (IllegalArgumentException ignored) {
        }
        ((AudioManager)this.getSystemService(Context.AUDIO_SERVICE)).setSpeakerphoneOn(false);
        super.onDestroy();
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        log("OnServiceConnected");
        this.binder = (MainService.MainBinder) iBinder;
        this.serviceBound = true;
        refreshContactList();
        updateOwnStatusText();
        refreshContactStatuses();
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        log("OnServiceDisconnected");
        this.serviceBound = false;
        this.binder = null;
        updateOwnStatusText();
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        log("onOptionsItemSelected");
        int id = item.getItemId();
        switch (id) {
            case R.id.action_settings: {
                Intent intent = new Intent(this, SettingsActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                startActivity(intent);
                break;
            }
            case R.id.action_backup: {
                //startActivity(new Intent(this, BackupActivity.class));
                break;
            }
            case R.id.action_about: {
                startActivity(new Intent(this, AboutActivity.class));
                break;
            }
        }
        return super.onOptionsItemSelected(item);
    }
    private final BroadcastReceiver refreshContactListReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (contactListView == null || binder == null) {
                return;
            }
            refreshContactList();
            stopSwipeRefresh();
        }
    };
    private final BroadcastReceiver ownStatusReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (activityResumed) {
                updateOwnStatusText();
            }
            stopSwipeRefresh();
        }
    };
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onNodeStatus(NodeStatusEvent event) {
        NodeStatus status = event.getStatus();
        if (status != null && status.isOnline()) {
            statusRefreshHandler.removeCallbacks(vpnOfflineRunnable);
            vpnOnline = true;
            // Keep own ID/QR address aligned with current TUN IPv4.
            if (binder != null && binder.getSettings() != null
                && Utils.syncIdentityFromTun(binder.getSettings())) {
                try {
                    binder.saveDatabase();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        } else if (status != null && !status.isOnline()) {
            // NodeStatus.isOnline() is planet reachability, not VpnService/TUN state.
            // During/after calls it can flap OFFLINE while the system VPN key stays up.
            if (Utils.getFirstTunIpv4() != null) {
                statusRefreshHandler.removeCallbacks(vpnOfflineRunnable);
                vpnOnline = true;
            } else if (binder != null && binder.getCurrentCall() != null) {
                vpnOnline = true;
            } else {
                statusRefreshHandler.removeCallbacks(vpnOfflineRunnable);
                statusRefreshHandler.postDelayed(vpnOfflineRunnable, VPN_OFFLINE_DEBOUNCE_MS);
            }
        }
        updateOwnStatusText();
        stopSwipeRefresh();
    }
    /** Prefer TUN presence over flaky NodeStatus for the VPN status line. */
    private void refreshVpnFromTunnel() {
        if (Utils.getFirstTunIpv4() != null) {
            statusRefreshHandler.removeCallbacks(vpnOfflineRunnable);
            if (!vpnOnline) {
                vpnOnline = true;
                updateOwnStatusText();
            }
        }
    }
    @Override
    protected void onStart() {
        super.onStart();
        if (!eventBus.isRegistered(this)) {
            eventBus.register(this);
        }
    }
    @Override
    protected void onStop() {
        super.onStop();
        statusRefreshHandler.removeCallbacks(statusRefreshRunnable);
        if (eventBus.isRegistered(this)) {
            eventBus.unregister(this);
        }
    }
    @Override
    protected void onResume() {
        log("OnResume");
        super.onResume();
        activityResumed = true;
        if (!serviceBound) {
            bindService(new Intent(this, MainService.class), this, Service.BIND_AUTO_CREATE);
        } else if (binder != null) {
            refreshContactList();
            refreshVpnFromTunnel();
            ensureVpnServiceRunning();
            updateOwnStatusText();
            refreshContactStatuses();
        }
        eventBus.post(new RequestNodeStatusEvent());
        statusRefreshHandler.removeCallbacks(statusRefreshRunnable);
        statusRefreshHandler.postDelayed(statusRefreshRunnable, STATUS_REFRESH_INTERVAL_MS);
    }
    /**
     * After a call crash/error the process may leave ZeroTier stopped while the UI
     * still thinks VPN should be up. Restart the last-activated network if TUN is gone.
     */
    private void ensureVpnServiceRunning() {
        if (Utils.getFirstTunIpv4() != null) {
            vpnOnline = true;
            return;
        }
        try {
            if (VpnService.prepare(this) != null) {
                return;
            }
            NetworkDao networkDao = ((BackOneConnectApplication) getApplication())
                .getDaoSession()
                .getNetworkDao();
            List<Network> activated = networkDao.queryBuilder()
                .where(NetworkDao.Properties.LastActivated.eq(true))
                .list();
            if (activated == null || activated.isEmpty()) {
                activated = networkDao.loadAll();
            }
            if (activated == null || activated.isEmpty()) {
                return;
            }
            Network network = activated.get(0);
            Intent intent = new Intent(this, ZeroTierOneService.class);
            intent.putExtra(ZeroTierOneService.ZT1_NETWORK_ID, network.getNetworkId());
            intent.putExtra(ZeroTierOneService.ZT1_USE_DEFAULT_ROUTE, network.getUseDefaultRoute());
            startService(intent);
            log("restarted VPN service for network " + network.getNetworkIdStr());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @Override
    protected void onPause() {
        log("onPause");
        activityResumed = false;
        super.onPause();
        collapseFab();
        statusRefreshHandler.removeCallbacks(statusRefreshRunnable);
        statusRefreshHandler.removeCallbacks(refreshTimeoutRunnable);
    }
    private void collapseFab() {
        if (fabExpanded) {
            fab.setImageResource(R.drawable.qr_glass);
            fabScan.clearAnimation();
            fabGen.clearAnimation();
            fabScan.setY(fabScan.getY() + 200);
            fabGen.setY(fabGen.getY() + 200 * 2);
            fabExpanded = false;
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == MIC_PERMISSION_REQUEST_CODE
            && !Utils.allGranted(grantResults)) {
            Toast.makeText(this, R.string.permission_mic, Toast.LENGTH_LONG).show();
        }
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        log("onCreateOptionsMenu");
        getMenuInflater().inflate(R.menu.menu_main_activity, menu);
        return true;
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,841 @@
 package backone.cloud.call;
 import android.app.Service;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Binder;
 import android.os.Handler;
 import android.os.IBinder;
 import androidx.annotation.Nullable;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import android.widget.Toast;
 import org.json.JSONObject;
 import org.libsodium.jni.Sodium;
 import java.io.File;
 import java.io.IOException;
 import java.net.BindException;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 public class MainService extends Service implements Runnable {
    private static final int BIND_RETRY_COUNT = 3;
    private static final long BIND_RETRY_DELAY_MS = 400L;
    private static final int MAX_SIGNALING_CLIENTS = 8;
    private static final int SIGNALING_IDLE_TIMEOUT_MS = 30_000;
    public static final String ACTION_OWN_STATUS_CHANGED = "own_status_changed";
    public static final String EXTRA_OWN_STATUS = "own_status";
    enum OwnStatus { CHECKING, LISTENING, NOT_LISTENING, IN_CALL }
    private Database db = null;
    private boolean first_start = false;
    private String database_path = "";
    private String database_password = "";
    public static final int serverPort = 10001;
    private ServerSocket server;
    private volatile boolean run = true;
    private volatile OwnStatus ownStatus = OwnStatus.CHECKING;
    private RTCCall currentCall = null;
    private final AtomicInteger activeSignalingClients = new AtomicInteger(0);
    private ArrayList<CallEvent> events = null;
    @Override
    public void onCreate() {
        super.onCreate();
        this.database_path = this.getFilesDir() + "/database.bin";
        // handle incoming connections
        new Thread(this).start();
        events = new ArrayList<>();
    }
    private void loadDatabase() {
        try {
            if ((new File(this.database_path)).exists()) {
                // open existing database
                this.db = Database.load(this.database_path, this.database_password);
                this.first_start = false;
            } else {
                // create new database
                this.db = new Database();
                this.first_start = true;
            }
            if (this.db != null) {
                Crypto.setLegacyCompatibility(this.db.settings.getLegacyCompatibility());
            }
        } catch (Exception e) {
            // ignore
        }
    }
    private void saveDatabase() {
        try {
            Database.store(MainService.this.database_path, MainService.this.db, MainService.this.database_password);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        this.run = false;
        // The database might be null here if no correct
        // database password was supplied to open it.
        if (this.db != null) {
            try {
                Database.store(this.database_path, this.db, this.database_password);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        // Notify online contacts we are going offline, then always release the listen port.
        if (this.db != null && this.server != null && this.server.isBound() && !this.server.isClosed()) {
            try {
                byte[] ownPublicKey = this.db.settings.getPublicKey();
                byte[] ownSecretKey = this.db.settings.getSecretKey();
                String message = "{\"action\": \"status_change\", \"status\": \"offline\"}";
                for (Contact contact : this.db.contacts) {
                    if (contact.getState() == Contact.State.OFFLINE) {
                        continue;
                    }
                    byte[] encrypted = Crypto.encryptMessage(message, contact.getPublicKey(), ownPublicKey, ownSecretKey);
                    if (encrypted == null) {
                        continue;
                    }
                    Socket socket = null;
                    try {
                        socket = contact.createSocket();
                        if (socket == null) {
                            continue;
                        }
                        PacketWriter pw = new PacketWriter(socket);
                        pw.writeMessage(encrypted);
                        socket.close();
                    } catch (Exception e) {
                        if (socket != null) {
                            try {
                                socket.close();
                            } catch (Exception ee) {
                                // ignore
                            }
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        closeServerSocket();
        if (this.db != null) {
            // zero keys from memory
            this.db.onDestroy();
        }
    }
    private void closeServerSocket() {
        ServerSocket socket = this.server;
        this.server = null;
        if (socket == null) {
            return;
        }
        try {
            if (!socket.isClosed()) {
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    private ServerSocket openServerSocket() throws IOException {
        IOException lastError = null;
        for (int attempt = 1; attempt <= BIND_RETRY_COUNT; attempt++) {
            if (!this.run) {
                return null;
            }
            ServerSocket candidate = null;
            try {
                candidate = new ServerSocket();
                candidate.setReuseAddress(true);
                candidate.bind(new InetSocketAddress(serverPort));
                return candidate;
            } catch (IOException e) {
                if (candidate != null) {
                    try {
                        candidate.close();
                    } catch (IOException ignored) {
                    }
                }
                if (!isAddressInUse(e)) {
                    throw e;
                }
                lastError = e;
                log("bind port " + serverPort + " failed (attempt " + attempt + "/" + BIND_RETRY_COUNT + "): " + e.getMessage());
                if (attempt < BIND_RETRY_COUNT && this.run) {
                    try {
                        Thread.sleep(BIND_RETRY_DELAY_MS);
                    } catch (InterruptedException interrupted) {
                        Thread.currentThread().interrupt();
                        return null;
                    }
                }
            }
        }
        throw lastError != null ? lastError : new BindException("Address already in use");
    }
    private static boolean isAddressInUse(IOException e) {
        if (e instanceof BindException) {
            return true;
        }
        String message = e.getMessage();
        return message != null && message.toUpperCase().contains("EADDRINUSE");
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // START_STICKY recreate can come back without StartActivity reloading the DB.
        if (this.db == null) {
            loadDatabase();
        }
        return START_STICKY;
    }
    private boolean isActiveCallSocket(Socket client) {
        RTCCall call = this.currentCall;
        return call != null && call.commSocket != null && call.commSocket == client;
    }
    private boolean isCallInProgress() {
        RTCCall call = this.currentCall;
        if (call == null) {
            return false;
        }
        // Null until the first state report — still treat as busy.
        RTCCall.CallState state = call.state;
        return state == null
            || state == RTCCall.CallState.CONNECTING
            || state == RTCCall.CallState.RINGING
            || state == RTCCall.CallState.CONNECTED;
    }
    private void handleClient(Socket client) {
        if (this.db == null || this.db.settings == null) {
            log("handleClient: database not ready");
            try {
                client.close();
            } catch (IOException ignored) {
            }
            return;
        }
        byte[] ownSecretKey = this.db.settings.getSecretKey();
        byte[] ownPublicKey = this.db.settings.getPublicKey();
        byte[] clientPublicKey = new byte[Sodium.crypto_sign_publickeybytes()];
        boolean handedOff = false;
        try {
            PacketWriter pw = new PacketWriter(client);
            PacketReader pr = new PacketReader(client);
            Contact contact = null;
            InetSocketAddress remote_address = (InetSocketAddress) client.getRemoteSocketAddress();
            log("incoming connection from " + remote_address);
            while (true) {
                byte[] request = pr.readMessage();
                if (request == null) {
                    break;
                }
                String decrypted = Crypto.decryptMessage(request, clientPublicKey, ownPublicKey, ownSecretKey);
                if (decrypted == null) {
                    log("decryption failed");
                    break;
                }
                boolean legacyPlaintext = Crypto.isZeroKey(clientPublicKey);
                if (contact == null) {
                    if (!legacyPlaintext) {
                        for (Contact c : this.db.contacts) {
                            if (Arrays.equals(c.getPublicKey(), clientPublicKey)) {
                                contact = c;
                                break;
                            }
                        }
                    }
                    if (contact == null) {
                        contact = findContactByAddress(remote_address);
                        if (contact != null && Crypto.isValidSignPublicKey(contact.getPublicKey())) {
                            System.arraycopy(
                                contact.getPublicKey(), 0,
                                clientPublicKey, 0,
                                Math.min(contact.getPublicKey().length, clientPublicKey.length)
                            );
                        }
                    }
                    // Ignore blocked/unknown peers without touching the active call.
                    if (contact == null && this.db.settings.getBlockUnknown()) {
                        log("block unknown contact => ignore");
                        break;
                    }
                    if (contact != null && contact.getBlocked()) {
                        log("blocked contact => ignore");
                        break;
                    }
                    if (contact == null) {
                        // unknown caller (allowed only when block_unknown is off)
                        contact = new Contact("", clientPublicKey.clone(), new ArrayList<>());
                    }
                }
                // suspicious change of identity during connection (skip for legacy plaintext)
                if (!legacyPlaintext && !Arrays.equals(contact.getPublicKey(), clientPublicKey)) {
                    log("suspicious change of key");
                    continue;
                }
                // remember last good address (the outgoing port is random and not the server port)
                contact.setLastWorkingAddress(
                    new InetSocketAddress(remote_address.getAddress(), MainService.serverPort)
                );
                JSONObject obj = new JSONObject(decrypted);
                String action = obj.optString("action", "");
                switch (action) {
                    case "call": {
                        // Reject while busy — do not overwrite or hang up the active call.
                        if (isCallInProgress()) {
                            log("busy — rejecting incoming call");
                            byte[] dismissed = Crypto.encryptMessage(
                                "{\"action\":\"dismissed\"}",
                                contact.getPublicKey(), ownPublicKey, ownSecretKey
                            );
                            if (dismissed != null) {
                                pw.writeMessage(dismissed);
                            }
                            return;
                        }
                        log("call...");
                        String offer = obj.getString("offer");
                        this.currentCall = new RTCCall(this, new MainBinder(), contact, client, offer);
                        updateOwnStatus(resolveOwnStatus());
                        byte[] encrypted = Crypto.encryptMessage("{\"action\":\"ringing\"}", contact.getPublicKey(), ownPublicKey, ownSecretKey);
                        pw.writeMessage(encrypted);
                        // keep socket open for answer/hangup; clear idle timeout for the call
                        client.setSoTimeout(0);
                        try {
                            client.setKeepAlive(true);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                        Intent intent = new Intent(this, CallActivity.class);
                        intent.setAction("ACTION_INCOMING_CALL");
                        intent.putExtra("EXTRA_CONTACT", contact);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);
                        handedOff = true;
                        return;
                    }
                    case "ping": {
                        log("ping...");
                        setClientState(contact, Contact.State.ONLINE);
                        byte[] encrypted = Crypto.encryptMessage("{\"action\":\"pong\"}", contact.getPublicKey(), ownPublicKey, ownSecretKey);
                        pw.writeMessage(encrypted);
                        break;
                    }
                    case "status_change": {
                        if (obj.optString("status", "").equals("offline")) {
                            setClientState(contact, Contact.State.OFFLINE);
                        } else {
                            log("Received unknown status_change: " + obj.getString("status"));
                        }
                    }
                }
            }
            log("client disconnected");
            // Only the active call socket should finish CallActivity.
            if (isActiveCallSocket(client)) {
                LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent("call_declined"));
            }
        } catch (Exception e) {
            e.printStackTrace();
            log("client disconnected (exception)");
            // Decline only the call that owns this socket — not an unrelated peer.
            RTCCall call = this.currentCall;
            if (call != null && isActiveCallSocket(client)) {
                call.decline();
            }
        } finally {
            Arrays.fill(clientPublicKey, (byte) 0);
            if (!handedOff) {
                try {
                    client.close();
                } catch (IOException ignored) {
                }
            }
        }
    }
    private Contact findContactByAddress(InetSocketAddress remoteAddress) {
        if (remoteAddress == null || remoteAddress.getAddress() == null || this.db == null) {
            return null;
        }
        byte[] remoteIp = remoteAddress.getAddress().getAddress();
        for (Contact contact : this.db.contacts) {
            // Verified builds store TUN IPv4 bytes as public_key.
            if (Utils.isIpv4IdentityKey(contact.getPublicKey())
                && Arrays.equals(contact.getPublicKey(), remoteIp)) {
                return contact;
            }
            if (contact.getLastWorkingAddress() != null
                && remoteAddress.getAddress().equals(contact.getLastWorkingAddress().getAddress())) {
                return contact;
            }
            for (InetSocketAddress addr : contact.getAllSocketAddresses()) {
                if (addr != null && addr.getAddress() != null
                    && remoteAddress.getAddress().equals(addr.getAddress())) {
                    return contact;
                }
            }
        }
        return null;
    }
    private void setClientState(Contact contact, Contact.State state) {
        if (contact == null || state == null) {
            return;
        }
        contact.setState(state);
        LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent("refresh_contact_list"));
    }
    @Override
    public void run() {
        try {
            // wait until database is ready
            while (this.db == null && this.run) {
                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    break;
                }
            }
            // Service was destroyed while waiting — do not bind and leak the port.
            if (!this.run) {
                return;
            }
            try {
                server = openServerSocket();
            } catch (IOException e) {
                if (!isAddressInUse(e)) {
                    throw e;
                }
                e.printStackTrace();
                // Keep the service alive for DB/settings UI; incoming calls need a free port.
                updateOwnStatus(OwnStatus.NOT_LISTENING);
                new Handler(getMainLooper()).post(() -> Toast.makeText(
                    this,
                    "Port " + serverPort + " in use — close other Bachot/Meshenger instances",
                    Toast.LENGTH_LONG
                ).show());
                return;
            }
            if (server == null || !this.run) {
                closeServerSocket();
                return;
            }
            updateOwnStatus(OwnStatus.LISTENING);
            while (this.run) {
                try {
                    Socket socket = server.accept();
                    if (activeSignalingClients.get() >= MAX_SIGNALING_CLIENTS) {
                        log("rejecting connection: too many signaling clients");
                        try {
                            socket.close();
                        } catch (IOException ignored) {
                        }
                        continue;
                    }
                    activeSignalingClients.incrementAndGet();
                    new Thread(() -> {
                        try {
                            socket.setSoTimeout(SIGNALING_IDLE_TIMEOUT_MS);
                            handleClient(socket);
                        } catch (Exception e) {
                            e.printStackTrace();
                        } finally {
                            activeSignalingClients.decrementAndGet();
                        }
                    }).start();
                } catch (IOException e) {
                    // ignore (including close during shutdown)
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
            new Handler(getMainLooper()).post(() -> Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show());
        } finally {
            closeServerSocket();
        }
    }
    private void updateOwnStatus(OwnStatus status) {
        if (status == null || this.ownStatus == status) {
            return;
        }
        this.ownStatus = status;
        Intent intent = new Intent(ACTION_OWN_STATUS_CHANGED);
        intent.putExtra(EXTRA_OWN_STATUS, status.name());
        LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }
    private OwnStatus resolveOwnStatus() {
        if (isCallInProgress()) {
            return OwnStatus.IN_CALL;
        }
        return probeOwnConnectivity();
    }
    private OwnStatus probeOwnConnectivity() {
        ServerSocket socket = this.server;
        if (socket != null && socket.isBound() && !socket.isClosed()) {
            return OwnStatus.LISTENING;
        }
        return OwnStatus.NOT_LISTENING;
    }
    private void setContactsPending() {
        if (this.db == null) {
            return;
        }
        for (Contact contact : this.db.contacts) {
            contact.setState(Contact.State.PENDING);
        }
        LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent("refresh_contact_list"));
    }
    /*
    * Allows communication between MainService and other objects
    */
    class MainBinder extends Binder {
        RTCCall getCurrentCall() {
            return currentCall;
        }
        void clearCurrentCall(RTCCall call) {
            if (call != null && currentCall == call) {
                currentCall = null;
                updateOwnStatus(resolveOwnStatus());
            }
        }
        void setCurrentCall(RTCCall call) {
            currentCall = call;
            updateOwnStatus(resolveOwnStatus());
        }
        boolean isFirstStart() {
            return MainService.this.first_start;
        }
        Contact getContactByPublicKey(byte[] pubKey) {
            if (MainService.this.db == null) {
                return null;
            }
            for (Contact contact : MainService.this.db.contacts) {
                if (Arrays.equals(contact.getPublicKey(), pubKey)) {
                    return contact;
                }
            }
            return null;
        }
        Contact getContactByName(String name) {
            if (MainService.this.db == null) {
                return null;
            }
            for (Contact contact : MainService.this.db.contacts) {
                if (contact.getName().equals(name)) {
                    return contact;
                }
            }
            return null;
        }
        void addContact(Contact contact) {
            db.addContact(contact);
            saveDatabase();
            LocalBroadcastManager.getInstance(MainService.this).sendBroadcast(new Intent("refresh_contact_list"));
        }
        void deleteContact(byte[] pubKey) {
            db.deleteContact(pubKey);
            saveDatabase();
            LocalBroadcastManager.getInstance(MainService.this).sendBroadcast(new Intent("refresh_contact_list"));
        }
        void shutdown() {
            MainService.this.stopSelf();
        }
        String getDatabasePassword() {
            return MainService.this.database_password;
        }
        void setDatabasePassword(String password) {
            MainService.this.database_password = password;
        }
        Database getDatabase() {
            return MainService.this.db;
        }
        void loadDatabase() {
            MainService.this.loadDatabase();
        }
        void replaceDatabase(Database db) {
            if (db != null) {
                if (MainService.this.db == null) {
                    MainService.this.db = db;
                } else {
                    MainService.this.db = db;
                    saveDatabase();
                }
            }
        }
        void pingContacts() {
            if (MainService.this.db == null || getSettings() == null) {
                checkOwnConnectivity();
                return;
            }
            setContactsPending();
            new Thread(new PingRunnable(
                MainService.this,
                getContactsCopy(),
                getSettings() != null ? getSettings().getPublicKey() : null,
                getSettings() != null ? getSettings().getSecretKey() : null)
            ).start();
        }
        void checkOwnConnectivity() {
            new Thread(() -> updateOwnStatus(resolveOwnStatus())).start();
        }
        OwnStatus getOwnStatus() {
            return resolveOwnStatus();
        }
        boolean isSignalingReady() {
            if (MainService.this.db == null) {
                return false;
            }
            OwnStatus status = resolveOwnStatus();
            return status == OwnStatus.LISTENING || status == OwnStatus.IN_CALL;
        }
        void saveDatabase() {
            MainService.this.saveDatabase();
        }
        Settings getSettings() {
            if (MainService.this.db == null) {
                return null;
            }
            return MainService.this.db.settings;
        }
        // return a cloned list
        List<Contact> getContactsCopy() {
            if (MainService.this.db == null) {
                return new ArrayList<>();
            }
           return new ArrayList<>(MainService.this.db.contacts);
        }
        void addCallEvent(Contact contact, CallEvent.Type type) {
            InetSocketAddress last_working = contact.getLastWorkingAddress();
            MainService.this.events.add(new CallEvent(
                contact.getPublicKey(),
                    (last_working != null) ? last_working.getAddress() : null,
                type
            ));
            LocalBroadcastManager.getInstance(MainService.this).sendBroadcast(new Intent("refresh_event_list"));
        }
        // return a cloned list
        List<CallEvent> getEventsCopy() {
            return new ArrayList<>(MainService.this.events);
        }
        void clearEvents() {
            MainService.this.events.clear();
            LocalBroadcastManager.getInstance(MainService.this).sendBroadcast(new Intent("refresh_event_list"));
        }
    }
    class PingRunnable implements Runnable {
        final Context context;
        private final List<Contact> contacts;
        final byte[] ownPublicKey;
        final byte[] ownSecretKey;
        final MainBinder binder;
        PingRunnable(Context context, List<Contact> contacts, byte[] ownPublicKey, byte[] ownSecretKey) {
            this.context = context;
            this.contacts = contacts;
            this.ownPublicKey = ownPublicKey;
            this.ownSecretKey = ownSecretKey;
            this.binder = new MainBinder();
        }
        private void setState(byte[] publicKey, Contact.State state) {
            Contact contact = this.binder.getContactByPublicKey(publicKey);
            if (contact != null) {
                contact.setState(state);
                // Refresh immediately so green/online shows as soon as ping connects.
                LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("refresh_contact_list"));
            }
        }
        @Override
        public void run() {
            // IP-as-key identity uses a null secretKey (legacy plaintext). Do not bail —
            // that left contacts stuck in PENDING after setContactsPending().
            if (ownPublicKey == null) {
                for (Contact contact : contacts) {
                    setState(contact.getPublicKey(), Contact.State.OFFLINE);
                }
                updateOwnStatus(resolveOwnStatus());
                LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("refresh_contact_list"));
                return;
            }
            for (Contact contact : contacts) {
                Socket socket = null;
                byte[] publicKey = contact.getPublicKey();
                try {
                    socket = contact.createSocket();
                    if (socket == null) {
                        setState(publicKey, Contact.State.OFFLINE);
                        continue;
                    }
                    PacketWriter pw = new PacketWriter(socket);
                    PacketReader pr = new PacketReader(socket);
                    log("send ping to " + contact.getName());
                    byte[] encrypted = Crypto.encryptMessage("{\"action\":\"ping\"}", publicKey, ownPublicKey, ownSecretKey);
                    if (encrypted == null) {
                        setState(publicKey, Contact.State.OFFLINE);
                        socket.close();
                        continue;
                    }
                    pw.writeMessage(encrypted);
                    byte[] request = pr.readMessage();
                    if (request == null) {
                        setState(publicKey, Contact.State.OFFLINE);
                        socket.close();
                        continue;
                    }
                    byte[] senderPublicKey = new byte[Sodium.crypto_sign_publickeybytes()];
                    String decrypted = Crypto.decryptMessage(request, senderPublicKey, ownPublicKey, ownSecretKey);
                    if (decrypted == null) {
                        log("decryption failed");
                        setState(publicKey, Contact.State.OFFLINE);
                        socket.close();
                        continue;
                    }
                    if (!Crypto.isZeroKey(senderPublicKey) && !Arrays.equals(publicKey, senderPublicKey)) {
                        log("pubkey mismatch on pong");
                        setState(publicKey, Contact.State.OFFLINE);
                        socket.close();
                        continue;
                    }
                    JSONObject obj = new JSONObject(decrypted);
                    String action = obj.optString("action", "");
                    if (action.equals("pong")) {
                        log("got pong");
                        setState(publicKey, Contact.State.ONLINE);
                    } else {
                        setState(publicKey, Contact.State.OFFLINE);
                    }
                    socket.close();
                } catch (Exception e) {
                    setState(publicKey, Contact.State.OFFLINE);
                    if (socket != null) {
                        try {
                            socket.close();
                        } catch (Exception ee) {
                            // ignore
                        }
                    }
                    e.printStackTrace();
                }
            }
            updateOwnStatus(resolveOwnStatus());
            log("send refresh_contact_list");
            LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("refresh_contact_list"));
        }
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new MainBinder();
    }
    private void log(String data) {
        Log.d(this, data);
    }
 }
@@ -0,0 +1,39 @@
 package backone.cloud.call;
 import android.os.Bundle;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.app.AppCompatDelegate;
 /*
 * Activity base class to apply night mode
 */
 public class MeshengerActivity extends AppCompatActivity {
    boolean dark_active; // dark mode
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dark_active = darkModeEnabled();
        setTheme(dark_active ? R.style.AppTheme_Dark : R.style.AppTheme_Light);
    }
    private boolean darkModeEnabled() {
        return (AppCompatDelegate.getDefaultNightMode() == AppCompatDelegate.MODE_NIGHT_YES);
    }
    @Override
    protected void onResume() {
        super.onResume();
        // recreate acitivity to apply mode
        boolean dark_active_now = darkModeEnabled();
        if (dark_active != dark_active_now) {
            dark_active = dark_active_now;
            recreate();
        }
    }
 }
@@ -0,0 +1,66 @@
 package backone.cloud.call;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.Socket;
 /* Read the message size from the header and return the message of the correct size */
 class PacketReader {
    // SDP offers with ICE candidates + crypto seal easily exceed 12KB.
    static final int MAX_PAYLOAD_BYTES = 64_000;
    final InputStream is;
    final byte[] buffer;
    int pos;
    PacketReader(Socket socket) throws IOException {
        this.is = socket.getInputStream();
        this.buffer = new byte[MAX_PAYLOAD_BYTES + 4];
        this.pos = 0;
    }
    private static int readMessageHeader(byte[] packet) {
        return ((packet[0] & 0xFF) << 24)
            | ((packet[1] & 0xFF) << 16)
            | ((packet[2] & 0xFF) << 8)
            | ((packet[3] & 0xFF) << 0);
    }
    byte[] readMessage() throws IOException {
        while (true) {
            int read = is.read(buffer, pos, buffer.length - pos);
            if (read < 0) {
                break;
            }
            pos += read;
            if (pos < 4) {
                continue;
            }
            int len = readMessageHeader(buffer);
            if (len < 0 || len > MAX_PAYLOAD_BYTES) {
                break;
            }
            // not enough data
            if (pos < (4 + len)) {
                continue;
            }
            byte[] request = new byte[len];
            System.arraycopy(buffer, 4, request, 0, request.length);
            int remaining = pos - (4 + len);
            if (remaining > 0) {
                System.arraycopy(buffer, 4 + len, buffer, 0, remaining);
            }
            pos = remaining;
            return request;
        }
        return null;
    }
 }
@@ -0,0 +1,42 @@
 package backone.cloud.call;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.net.Socket;
 /* Write the message header before the message is send */
 class PacketWriter {
    final OutputStream os;
    final byte[] header;
    public PacketWriter(Socket socket) throws IOException {
        this.os = socket.getOutputStream();
        this.header = new byte[4];
    }
    private static void writeMessageHeader(byte[] packet, int value) {
        packet[0] = (byte) ((value >> 24) & 0xff);
        packet[1] = (byte) ((value >> 16) & 0xff);
        packet[2] = (byte) ((value >> 8) & 0xff);
        packet[3] = (byte) ((value >> 0) & 0xff);
    }
    public void writeMessage(byte[] message) throws IOException {
        if (message == null) {
            throw new IOException("signaling message is null");
        }
        if (message.length > PacketReader.MAX_PAYLOAD_BYTES) {
            throw new IOException("signaling message too large: " + message.length
                + " > " + PacketReader.MAX_PAYLOAD_BYTES);
        }
    	writeMessageHeader(this.header, message.length);
    	// need to concatenate?
    	this.os.write(this.header);
        this.os.write(message);
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,280 @@
 package backone.cloud.call;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.content.pm.PackageManager;
 import android.os.IBinder;
 import androidx.annotation.NonNull;
 import android.os.Bundle;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.ResultPoint;
 import com.journeyapps.barcodescanner.BarcodeCallback;
 import com.journeyapps.barcodescanner.BarcodeResult;
 import com.journeyapps.barcodescanner.DecoratedBarcodeView;
 import com.journeyapps.barcodescanner.DefaultDecoderFactory;
 import org.json.JSONException;
 import org.json.JSONObject;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 public class QRScanActivity extends MeshengerActivity implements BarcodeCallback, ServiceConnection {
    private DecoratedBarcodeView barcodeView;
    private MainService.MainBinder binder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
        setContentView(R.layout.activity_qrscan);
        setTitle(getString(R.string.scan_invited));
        bindService(new Intent(this, MainService.class), this, Service.BIND_AUTO_CREATE);
        if (!Utils.hasCameraPermission(this)) {
            Utils.requestCameraPermission(this, 1);
        }
        // qr show button
        findViewById(R.id.fabScan).setOnClickListener(view -> {
            startActivity(new Intent(this, QRShowActivity.class));
            finish();
        });
        // manual input button
        findViewById(R.id.fabManualInput).setOnClickListener(view -> {
            startManualInput();
        });
    }
    private void addContact(String data) throws JSONException {
        if (binder == null) {
            Toast.makeText(this, R.string.invalid_data, Toast.LENGTH_SHORT).show();
            return;
        }
        JSONObject object = new JSONObject(data);
        Contact new_contact = Contact.importJSON(object, false);
        if (new_contact.getAddresses().isEmpty()) {
            Toast.makeText(this, R.string.contact_has_no_address_warning, Toast.LENGTH_LONG).show();
        }
        // lookup existing contacts by key and name
        Contact existing_pubkey_contact = binder.getContactByPublicKey(new_contact.getPublicKey());
        Contact existing_name_contact = binder.getContactByName(new_contact.getName());
        if (existing_pubkey_contact != null) {
            // contact with that public key exists
            showPubkeyConflictDialog(new_contact, existing_pubkey_contact);
        } else if (existing_name_contact != null) {
            // contact with that name exists
            showNameConflictDialog(new_contact, existing_name_contact);
        } else {
            // no conflict
            binder.addContact(new_contact);
            finish();
        }
    }
    private void showPubkeyConflictDialog(Contact new_contact, Contact other_contact) {
        Dialog dialog = new Dialog(this);
        dialog.setContentView(R.layout.dialog_add_contact_pubkey_conflict);
        TextView nameTextView = dialog.findViewById(R.id.NameTextView);
        Button abortButton = dialog.findViewById(R.id.AbortButton);
        Button replaceButton = dialog.findViewById(R.id.ReplaceButton);
        nameTextView.setText(other_contact.getName());
        replaceButton.setOnClickListener((View v) -> {
            QRScanActivity.this.binder.deleteContact(other_contact.getPublicKey());
            QRScanActivity.this.binder.addContact(new_contact);
            // done
            Toast.makeText(QRScanActivity.this, R.string.done, Toast.LENGTH_SHORT).show();
            dialog.cancel();
            QRScanActivity.this.finish();
        });
        abortButton.setOnClickListener((View v) -> {
            dialog.cancel();
            barcodeView.resume();
        });
        dialog.show();
    }
    private void showNameConflictDialog(Contact new_contact, Contact other_contact) {
        Dialog dialog = new Dialog(this);
        dialog.setContentView(R.layout.dialog_add_contact_name_conflict);
        EditText nameEditText = dialog.findViewById(R.id.NameEditText);
        Button abortButton = dialog.findViewById(R.id.AbortButton);
        Button replaceButton = dialog.findViewById(R.id.ReplaceButton);
        Button renameButton = dialog.findViewById(R.id.RenameButton);
        nameEditText.setText(other_contact.getName());
        replaceButton.setOnClickListener((View v) -> {
            QRScanActivity.this.binder.deleteContact(other_contact.getPublicKey());
            QRScanActivity.this.binder.addContact(new_contact);
            // done
            Toast.makeText(QRScanActivity.this, R.string.done, Toast.LENGTH_SHORT).show();
            dialog.cancel();
            QRScanActivity.this.finish();
        });
        renameButton.setOnClickListener((View v) -> {
            String name = nameEditText.getText().toString();
            if (name.isEmpty()) {
                Toast.makeText(this, R.string.contact_name_empty, Toast.LENGTH_SHORT).show();
                return;
            }
            if (QRScanActivity.this.binder.getContactByName(name) != null) {
                Toast.makeText(this, R.string.contact_name_exists, Toast.LENGTH_SHORT).show();
                return;
            }
            // rename
            new_contact.setName(name);
            QRScanActivity.this.binder.addContact(new_contact);
            // done
            Toast.makeText(QRScanActivity.this, R.string.done, Toast.LENGTH_SHORT).show();
            dialog.cancel();
            QRScanActivity.this.finish();
        });
        abortButton.setOnClickListener((View v) -> {
            dialog.cancel();
            barcodeView.resume();
        });
        dialog.show();
    }
    private void startManualInput() {
        barcodeView.pause();
        AlertDialog.Builder b = new AlertDialog.Builder(this);
        EditText et = new EditText(this);
        b.setTitle(R.string.paste_invitation)
            .setPositiveButton(R.string.ok, (dialogInterface, i) -> {
                try {
                    String data = et.getText().toString();
                    addContact(data);
                } catch (JSONException e) {
                    e.printStackTrace();
                    Toast.makeText(this, R.string.invalid_data, Toast.LENGTH_SHORT).show();
                }
            })
            .setNegativeButton(R.string.cancel, (dialog, i) -> {
                dialog.cancel();
                barcodeView.resume();
            })
            .setView(et);
        b.show();
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            initCamera();
        } else {
            Toast.makeText(this, R.string.camera_permission_request, Toast.LENGTH_LONG).show();
            finish();
        }
    }
    @Override
    public void barcodeResult(BarcodeResult result) {
        // no more scan until result is processed
        barcodeView.pause();
        try {
            String data = result.getText();
            addContact(data);
        } catch (JSONException e) {
            e.printStackTrace();
            Toast.makeText(this, R.string.invalid_qr, Toast.LENGTH_LONG).show();
        }
    }
    @Override
    public void possibleResultPoints(List<ResultPoint> resultPoints) {
        // ignore
    }
    @Override
    protected void onResume() {
        super.onResume();
        if (barcodeView != null && binder != null) {
            barcodeView.resume();
        }
    }
    @Override
    protected void onPause() {
        super.onPause();
        if (barcodeView != null && binder != null) {
            barcodeView.pause();
        }
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(this);
    }
    private void initCamera() {
        barcodeView = findViewById(R.id.barcodeScannerView);
        Collection<BarcodeFormat> formats = Collections.singletonList(BarcodeFormat.QR_CODE);
        barcodeView.getBarcodeView().setDecoderFactory(new DefaultDecoderFactory(formats));
        barcodeView.decodeContinuous(this);
        barcodeView.resume();
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        if (Utils.hasCameraPermission(this)) {
            initCamera();
        }
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        binder = null;
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,126 @@
 package backone.cloud.call;
 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.graphics.Bitmap;
 import android.os.IBinder;
 import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowManager;
 import android.widget.ImageView;
 import android.widget.RelativeLayout;
 import android.widget.Toast;
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.MultiFormatWriter;
 import com.google.zxing.common.BitMatrix;
 import com.journeyapps.barcodescanner.BarcodeEncoder;
 public class QRShowActivity extends MeshengerActivity implements ServiceConnection {
    private Contact contact = null;
    private MainService.MainBinder binder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
        setContentView(R.layout.activity_qrshow);
        if (getIntent().hasExtra("EXTRA_CONTACT")) {
            this.contact = (Contact) getIntent().getExtras().get("EXTRA_CONTACT");
            findViewById(R.id.fabPresenter).setVisibility(View.GONE);
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
            params.addRule(RelativeLayout.ALIGN_PARENT_END, RelativeLayout.TRUE);
            params.bottomMargin = params.rightMargin = 80;
            findViewById(R.id.fabShare).setLayoutParams(params);
        }
        setTitle(getString(R.string.scan_invitation));
        bindService();
        findViewById(R.id.fabPresenter).setOnClickListener(view -> {
            startActivity(new Intent(this, QRScanActivity.class));
            finish();
        });
        findViewById(R.id.fabShare).setOnClickListener(view -> {
            if (this.contact != null) try {
                String data = Contact.exportJSON(this.contact, false).toString();
                Intent i = new Intent(Intent.ACTION_SEND);
                i.putExtra(Intent.EXTRA_TEXT, data);
                i.setType("text/plain");
                startActivity(i);
                finish();
            } catch (Exception e) {
                // ignore
            }
        });
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (this.binder != null) {
            unbindService(this);
        }
    }
    private void bindService() {
        Intent serviceIntent = new Intent(this, MainService.class);
        bindService(serviceIntent, this, Service.BIND_AUTO_CREATE);
    }
    private void generateQR() throws Exception {
        if (this.contact == null) {
            // export own contact
            this.contact = this.binder.getSettings().getOwnContact();
        }
        String data = Contact.exportJSON(this.contact, false).toString();
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        BitMatrix bitMatrix = multiFormatWriter.encode(data, BarcodeFormat.QR_CODE, 1080, 1080);
        BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
        Bitmap bitmap = barcodeEncoder.createBitmap(bitMatrix);
        ((ImageView) findViewById(R.id.QRView)).setImageBitmap(bitmap);
        if (this.contact.getAddresses().isEmpty()) {
            Toast.makeText(this, R.string.contact_has_no_address_warning, Toast.LENGTH_SHORT).show();
        }
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        try {
            generateQR();
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
            finish();
        }
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        this.binder = null;
    }
    private final BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            finish();
        }
    };
    private static void log(String s) {
        Log.d(QRShowActivity.class.getSimpleName(), s);
    }
 }
@@ -0,0 +1,203 @@
 package backone.cloud.call;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 public class Settings {
    public static final String DEFAULT_ICE_SERVER = "stun:10.10.10.30:8090";
    private String username;
    private byte[] secretKey;
    private byte[] publicKey;
    private String language;
    private boolean nightMode;
    private boolean blockUnknown;
    private boolean developmentMode;
    /** Plaintext signaling for old Bachot builds that lack libsodium crypto. */
    private boolean legacyCompatibility;
    private List<String> addresses;
    // ICE (Interactive Connectivity Establishment) servers implement STUN and TURN
    private List<String> iceServers;
    public Settings() {
        this.username = "";
        this.secretKey = null;
        this.publicKey = null;
        this.language = "";
        this.nightMode = false;
        this.blockUnknown = true;
        this.developmentMode = false;
        this.legacyCompatibility = true;
        this.addresses = new ArrayList<>();
        this.iceServers = new ArrayList<>(Collections.singletonList(DEFAULT_ICE_SERVER));
    }
    public byte[] getSecretKey() {
        return secretKey;
    }
    public void setSecretKey(byte[] secretKey) {
        this.secretKey = secretKey;
    }
    public byte[] getPublicKey() {
        return publicKey;
    }
    public void setPublicKey(byte[] publicKey) {
        this.publicKey = publicKey;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getLanguage() {
        return language;
    }
    public void setLanguage(String language) {
        this.language = language;
    }
    public boolean getNightMode() {
        return nightMode;
    }
    public void setNightMode(boolean nightMode) {
        this.nightMode = nightMode;
    }
    public boolean getBlockUnknown() {
        return blockUnknown;
    }
    public void setBlockUnknown(boolean blockUnknown) {
        this.blockUnknown = blockUnknown;
    }
    public boolean getDevelopmentMode() {
        return developmentMode;
    }
    public void setDevelopmentMode(boolean developmentMode) {
        this.developmentMode = developmentMode;
    }
    public boolean getLegacyCompatibility() {
        return legacyCompatibility;
    }
    public void setLegacyCompatibility(boolean legacyCompatibility) {
        this.legacyCompatibility = legacyCompatibility;
        Crypto.setLegacyCompatibility(legacyCompatibility);
    }
    public List<String> getAddresses() {
        return this.addresses;
    }
    public void setAddresses(List<String> addresses) {
        this.addresses = addresses;
    }
    public void addAddress(String address) {
        for (String addr : this.getAddresses()) {
            if (addr.equalsIgnoreCase(address)) {
                return;
            }
        }
        this.addresses.add(address);
    }
    public List<String> getIceServers() {
        return this.iceServers;
    }
    public void setIceServers(List<String> iceServers) {
        List<String> cleaned = new ArrayList<>();
        if (iceServers != null) {
            for (String server : iceServers) {
                if (server == null) {
                    continue;
                }
                String trimmed = server.trim();
                if (!trimmed.isEmpty()) {
                    cleaned.add(trimmed);
                }
            }
        }
        if (cleaned.isEmpty()) {
            cleaned.add(DEFAULT_ICE_SERVER);
        }
        this.iceServers = cleaned;
    }
    public static Settings importJSON(JSONObject obj) throws JSONException {
        Settings s = new Settings();
        s.username = obj.getString("username");
        s.secretKey = Utils.hexStringToByteArray(obj.getString("secret_key"));
        s.publicKey = Utils.hexStringToByteArray(obj.getString("public_key"));
        s.language = obj.getString("language");
        s.nightMode = obj.getBoolean("night_mode");
        s.blockUnknown = obj.getBoolean("block_unknown");
        s.developmentMode = obj.getBoolean("development_mode");
        // Default true so upgrades keep talking to old plaintext peers
        s.legacyCompatibility = obj.optBoolean("legacy_compatibility", true);
        Crypto.setLegacyCompatibility(s.legacyCompatibility);
        JSONArray addresses = obj.getJSONArray("addresses");
        for (int i = 0; i < addresses.length(); i += 1) {
            s.addresses.add(addresses.getString(i));
        }
        JSONArray iceServers = obj.getJSONArray("ice_servers");
        List<String> parsedIce = new ArrayList<>();
        for (int i = 0; i < iceServers.length(); i += 1) {
            parsedIce.add(iceServers.getString(i));
        }
        s.setIceServers(parsedIce);
        return s;
    }
    public static JSONObject exportJSON(Settings s) throws JSONException {
        JSONObject obj = new JSONObject();
        obj.put("username", s.username);
        obj.put("secret_key", Utils.byteArrayToHexString(s.secretKey));
        obj.put("public_key", Utils.byteArrayToHexString(s.publicKey));
        obj.put("language", s.language);
        obj.put("night_mode", s.nightMode);
        obj.put("block_unknown", s.blockUnknown);
        obj.put("development_mode", s.developmentMode);
        obj.put("legacy_compatibility", s.legacyCompatibility);
        JSONArray addresses = new JSONArray();
        for (int i = 0; i < s.addresses.size(); i += 1) {
            addresses.put(s.addresses.get(i));
        }
        obj.put("addresses", addresses);
        JSONArray iceServers = new JSONArray();
        for (int i = 0; i < s.iceServers.size(); i += 1) {
            iceServers.put(s.iceServers.get(i));
        }
        obj.put("ice_servers", iceServers);
        return obj;
    }
    public Contact getOwnContact() {
        return new Contact(this.username, this.publicKey, this.addresses);
    }
 }
@@ -0,0 +1,359 @@
 package backone.cloud.call;
 import android.app.Dialog;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.content.res.Configuration;
 import android.os.IBinder;
 import androidx.appcompat.app.AlertDialog;
 import android.os.Bundle;
 import androidx.appcompat.app.AppCompatDelegate;
 import android.text.InputType;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.RadioButton;
 import android.widget.RadioGroup;
 import android.widget.TextView;
 import android.widget.Toast;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 import java.util.List;
 import java.util.Locale;
 import cloud.backone.backoneconnect.events.NodeStatusEvent;
 import cloud.backone.backoneconnect.events.RequestNodeStatusEvent;
 import cloud.backone.backoneconnect.ui.NetworkListActivity;
 import com.zerotier.sdk.NodeStatus;
 public class SettingsActivity extends MeshengerActivity implements ServiceConnection {
    private MainService.MainBinder binder;
    private final EventBus eventBus = EventBus.getDefault();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        setTitle(getResources().getString(R.string.menu_settings));
        bindService();
        initViews();
    }
    @Override
    protected void onStart() {
        super.onStart();
        if (!this.eventBus.isRegistered(this)) {
            this.eventBus.register(this);
        }
    }
    @Override
    protected void onStop() {
        super.onStop();
        if (this.eventBus.isRegistered(this)) {
            this.eventBus.unregister(this);
        }
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (this.binder != null) {
            unbindService(this);
        }
    }
    private void bindService() {
        // ask MainService to get us the binder object
        Intent serviceIntent = new Intent(this, MainService.class);
        bindService(serviceIntent, this, Service.BIND_AUTO_CREATE);
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        initViews();
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        this.binder = null;
    }
    private void initViews() {
        if (this.binder == null) {
            return;
        }
        findViewById(R.id.changeNameLayout).setOnClickListener((View view) -> {
            showChangeNameDialog();
        });
        findViewById(R.id.changeAddressLayout).setOnClickListener((View view) -> {
            Intent intent = new Intent(this, AddressActivity.class);
            startActivity(intent);
        });
        findViewById(R.id.changePasswordLayout).setOnClickListener((View view) -> {
            showChangePasswordDialog();
        });
        findViewById(R.id.changeIceServersLayout).setOnClickListener((View view) -> {
            showChangeIceServersDialog();
        });
        findViewById(R.id.backoneNetworkLayout).setOnClickListener((View view) -> {
            startActivity(new Intent(this, NetworkListActivity.class));
        });
        String username = this.binder.getSettings().getUsername();
        ((TextView) findViewById(R.id.nameTv)).setText(
            username.length() == 0 ? getResources().getString(R.string.none) : username
        );
        List<String> addresses = this.binder.getSettings().getAddresses();
        ((TextView) findViewById(R.id.addressTv)).setText(
            addresses.size() == 0 ? getResources().getString(R.string.none) : Utils.join(addresses)
        );
        String password = this.binder.getDatabasePassword();
        ((TextView) findViewById(R.id.passwordTv)).setText(
            password.isEmpty() ? getResources().getString(R.string.none) : "********"
        );
        List<String> iceServers = this.binder.getSettings().getIceServers();
        ((TextView) findViewById(R.id.iceServersTv)).setText(
            iceServers.isEmpty() ? getResources().getString(R.string.none) : Utils.join(iceServers)
        );
        boolean blockUnknown = this.binder.getSettings().getBlockUnknown();
        CheckBox blockUnknownCB = findViewById(R.id.checkBoxBlockUnknown);
        blockUnknownCB.setChecked(blockUnknown);
        blockUnknownCB.setOnCheckedChangeListener((compoundButton, isChecked) -> {
            // save value
            this.binder.getSettings().setBlockUnknown(isChecked);
            this.binder.saveDatabase();
        });
        boolean legacyCompatibility = this.binder.getSettings().getLegacyCompatibility();
        CheckBox legacyCompatibilityCB = findViewById(R.id.checkBoxLegacyCompatibility);
        legacyCompatibilityCB.setChecked(legacyCompatibility);
        legacyCompatibilityCB.setOnCheckedChangeListener((compoundButton, isChecked) -> {
            this.binder.getSettings().setLegacyCompatibility(isChecked);
            this.binder.saveDatabase();
        });
        boolean nightMode = this.binder.getSettings().getNightMode();
        CheckBox nightModeCB = findViewById(R.id.checkBoxNightMode);
        nightModeCB.setChecked(nightMode);
        nightModeCB.setOnCheckedChangeListener((compoundButton, isChecked) -> {
            // apply value
            AppCompatDelegate.setDefaultNightMode(
                isChecked ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO
            );
            // save value
            this.binder.getSettings().setNightMode(isChecked);
            this.binder.saveDatabase();
            // apply theme
            this.recreate();
        });
        boolean developmentMode = this.binder.getSettings().getDevelopmentMode();
        CheckBox developmentModeCB = findViewById(R.id.checkBoxDevelopmentMode);
        developmentModeCB.setChecked(developmentMode);
        developmentModeCB.setOnCheckedChangeListener((compoundButton, isChecked) -> {
            // save value
            this.binder.getSettings().setDevelopmentMode(isChecked);
            this.binder.saveDatabase();
        });
        findViewById(R.id.changeIceServersLayout).setVisibility(View.VISIBLE);
        this.eventBus.post(new RequestNodeStatusEvent());
        getLocale();
    }
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onNodeStatus(NodeStatusEvent event) {
        NodeStatus status = event.getStatus();
        TextView statusView = findViewById(R.id.backoneStatusTv);
        if (statusView == null) {
            return;
        }
        statusView.setText(status != null && status.isOnline()
            ? R.string.backone_status_online
            : R.string.backone_status_offline);
    }
    private void getLocale() {
        Configuration config = getResources().getConfiguration();
        Locale locale = config.locale;
        String language = locale.getDisplayLanguage();
        if (!this.binder.getSettings().getLanguage().equals(language)) {
            this.binder.getSettings().setLanguage(language);
            this.binder.saveDatabase();
        }
        ((TextView) findViewById(R.id.localeTv)).setText(language);
        Locale[] locales = new Locale[]{Locale.ENGLISH, Locale.FRENCH, Locale.GERMAN};
        findViewById(R.id.changeLocaleLayout).setOnClickListener((v) -> {
            RadioGroup group = new RadioGroup(this);
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            for (int i = 0; i < locales.length; i += 1) {
                Locale l = locales[i];
                RadioButton button = new RadioButton(this);
                button.setId(i);
                button.setText(l.getDisplayLanguage());
                if (l.getISO3Language().equals(locale.getISO3Language())) {
                    button.setChecked(true);
                }
                group.addView(button);
            }
            builder.setView(group);
            AlertDialog dialog = builder.show();
            group.setOnCheckedChangeListener((a, position) -> {
                log("changed locale to " + locales[position].getLanguage());
                Configuration config1 = new Configuration();
                config1.locale = locales[position];
                getResources().updateConfiguration(config1, getResources().getDisplayMetrics());
                this.binder.getSettings().setLanguage(locale.getDisplayLanguage());
                this.binder.saveDatabase();
                finish();
                startActivity(new Intent(getApplicationContext(), this.getClass()));
                dialog.dismiss();
            });
        });
    }
    private void showChangeNameDialog() {
        String username = this.binder.getSettings().getUsername();
        EditText et = new EditText(this);
        et.setText(username);
        et.setSelection(username.length());
        new AlertDialog.Builder(this)
            .setTitle(getResources().getString(R.string.settings_change_name))
            .setView(et)
            .setPositiveButton(R.string.ok, (dialogInterface, i) -> {
                String new_username = et.getText().toString().trim();
                if (Utils.isValidName(new_username)) {
                    this.binder.getSettings().setUsername(new_username);
                    this.binder.saveDatabase();
                    initViews();
                } else {
                    Toast.makeText(this, getResources().getString(R.string.invalid_name), Toast.LENGTH_SHORT).show();
                }
            })
            .setNegativeButton(getResources().getText(R.string.cancel), null)
            .show();
    }
    private void showChangePasswordDialog() {
        String password = this.binder.getDatabasePassword();
        EditText et = new EditText(this);
        et.setText(password);
        et.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        et.setSelection(password.length());
        AlertDialog dialog = new AlertDialog.Builder(this)
            .setTitle(getResources().getString(R.string.settings_change_password))
            .setView(et)
            .setPositiveButton(R.string.ok, (dialogInterface, i) -> {
                String new_password = et.getText().toString();
                this.binder.setDatabasePassword(new_password);
                this.binder.saveDatabase();
                initViews();
            })
            .setNegativeButton(getResources().getText(R.string.cancel), null)
            .create();
        if (dialog.getWindow() != null) {
            dialog.getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_SECURE,
                WindowManager.LayoutParams.FLAG_SECURE
            );
        }
        dialog.show();
    }
    private void showChangeIceServersDialog() {
        if (binder == null) {
            return;
        }
        Settings settings = SettingsActivity.this.binder.getSettings();
        Dialog dialog = new Dialog(this);
        dialog.setContentView(R.layout.dialog_set_ice_server);
        TextView iceServersTextView = dialog.findViewById(R.id.iceServersEditText);
        Button saveButton = dialog.findViewById(R.id.SaveButton);
        Button abortButton = dialog.findViewById(R.id.AbortButton);
        iceServersTextView.setText(Utils.join(settings.getIceServers()));
        saveButton.setOnClickListener((View v) -> {
            List<String> iceServers = Utils.split(iceServersTextView.getText().toString());
            if (containsTurnServer(iceServers)) {
                Toast.makeText(SettingsActivity.this, R.string.ice_turn_warning, Toast.LENGTH_LONG).show();
            }
            settings.setIceServers(iceServers);
            Toast.makeText(SettingsActivity.this, R.string.done, Toast.LENGTH_SHORT).show();
            dialog.cancel();
        });
        abortButton.setOnClickListener((View v) -> {
            dialog.cancel();
        });
        dialog.show();
    }
    private static boolean containsTurnServer(List<String> iceServers) {
        for (String server : iceServers) {
            String lower = server.trim().toLowerCase(Locale.US);
            if (lower.startsWith("turn:") || lower.startsWith("turns:")) {
                return true;
            }
        }
        return false;
    }
    @Override
    protected void onResume() {
        super.onResume();
        initViews();
    }
    @Override
    public void onBackPressed() {
        super.onBackPressed();
        Intent intent = new Intent(SettingsActivity.this, MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        startActivity(intent);
    }
    private void log(String s) {
        Log.d(SettingsActivity.class.getSimpleName(), s);
    }
 }
@@ -0,0 +1,516 @@
 package backone.cloud.call;
 import android.app.Dialog;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.graphics.Typeface;
 import android.net.VpnService;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.Looper;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatDelegate;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 import java.util.List;
 import cloud.backone.backoneconnect.BackOneConnectApplication;
 import cloud.backone.backoneconnect.events.NodeStatusEvent;
 import cloud.backone.backoneconnect.events.RequestNodeStatusEvent;
 import cloud.backone.backoneconnect.model.DaoSession;
 import cloud.backone.backoneconnect.model.Network;
 import cloud.backone.backoneconnect.model.NetworkConfig;
 import cloud.backone.backoneconnect.model.NetworkConfigDao;
 import cloud.backone.backoneconnect.model.NetworkDao;
 import cloud.backone.backoneconnect.service.ZeroTierOneService;
 import cloud.backone.backoneconnect.ui.NetworkListActivity;
 import cloud.backone.backoneconnect.util.NetworkIdUtils;
 import com.zerotier.sdk.NodeStatus;
 /*
 * Show splash screen, name setup dialog, database password dialog and
 * start background service before starting the MainActivity.
 */
 public class StartActivity extends MeshengerActivity implements ServiceConnection {
    private static final long BACKONE_ONLINE_TIMEOUT_MS = 5000L;
    private static final String DEFAULT_VPN_NETWORK_ID = "bcb8c440a0a2d8d9";
    private MainService.MainBinder binder;
    private int startState = 0;
    private final EventBus eventBus = EventBus.getDefault();
    private final Handler handler = new Handler(Looper.getMainLooper());
    private boolean awaitingBackOneCheck = false;
    private boolean backOneCheckInProgress = false;
    private AlertDialog backOneOfflineDialog;
    private final Runnable backOneTimeoutRunnable = this::onBackOneCheckTimeout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        Typeface type = Typeface.createFromAsset(getAssets(), "rounds_black.otf");
        //((TextView) findViewById(R.id.splashText)).setTypeface(type);
        // start MainService and call back via onServiceConnected()
        startService(new Intent(this, MainService.class));
    }
    private void continueInit() {
        this.startState += 1;
        switch (this.startState) {
            case 1:
                log("init 1: load database");
                // open without password
                this.binder.loadDatabase();
                continueInit();
                break;
            case 2:
                log("init 2: check database");
                if (this.binder.getDatabase() == null) {
                    // database is probably encrypted
                    showDatabasePasswordDialog();
                } else {
                    continueInit();
                }
                break;
            case 3:
                log("init 3: check username");
                if (this.binder.getSettings().getUsername().isEmpty()) {
                    this.binder.getSettings().setUsername(Utils.generateDefaultUsername());
                    try {
                        this.binder.saveDatabase();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                continueInit();
                break;
            case 4:
                log("init 4: check identity (TUN IPv4)");
                // May no-op until VPN assigns a tun address; retried after VPN online.
                syncTunIdentity();
                continueInit();
                break;
            case 5:
                log("init 5: check addresses");
                if (this.binder.isFirstStart()
                    && this.binder.getSettings().getAddresses().isEmpty()) {
                    showMissingAddressDialog();
                } else {
                    continueInit();
                }
                break;
            case 6:
                log("init 6: check BackOne online");
                startBackOneOnlineCheck();
                break;
            case 7:
               log("init 7: start contact list");
                // set night mode
                boolean nightMode = this.binder.getSettings().getNightMode();
                AppCompatDelegate.setDefaultNightMode(
                        nightMode ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO
                );
                unregisterBackOneEvents();
                // all done - show contact list
                startActivity(new Intent(this, MainActivity.class));
                finish();
                break;
        }
    }
    private void startBackOneOnlineCheck() {
        if (this.backOneCheckInProgress) {
            return;
        }
        this.backOneCheckInProgress = true;
        this.awaitingBackOneCheck = true;
        dismissBackOneOfflineDialog();
        if (!this.eventBus.isRegistered(this)) {
            this.eventBus.register(this);
        }
        tryStartBackOneService();
        this.eventBus.post(new RequestNodeStatusEvent());
        this.handler.removeCallbacks(this.backOneTimeoutRunnable);
        this.handler.postDelayed(this.backOneTimeoutRunnable, BACKONE_ONLINE_TIMEOUT_MS);
    }
    private void tryStartBackOneService() {
        Network network = resolveVpnNetwork();
        if (network == null) {
            log("VPN: no network available");
            return;
        }
        Intent prepare = VpnService.prepare(this);
        if (prepare != null) {
            log("VPN: consent required");
            return;
        }
        Intent intent = new Intent(this, ZeroTierOneService.class);
        intent.putExtra(ZeroTierOneService.ZT1_NETWORK_ID, network.getNetworkId());
        intent.putExtra(ZeroTierOneService.ZT1_USE_DEFAULT_ROUTE, network.getUseDefaultRoute());
        startService(intent);
    }
    /**
     * Reuse an existing BackOne network when possible:
     * LastActivated → any saved network → default ID (create only if DB empty).
     */
    private Network resolveVpnNetwork() {
        try {
            DaoSession daoSession = ((BackOneConnectApplication) getApplication()).getDaoSession();
            NetworkDao networkDao = daoSession.getNetworkDao();
            NetworkConfigDao networkConfigDao = daoSession.getNetworkConfigDao();
            List<Network> activated = networkDao.queryBuilder()
                .where(NetworkDao.Properties.LastActivated.eq(true))
                .list();
            if (activated != null && !activated.isEmpty()) {
                log("VPN: reusing last-activated network " + activated.get(0).getNetworkIdStr());
                return activated.get(0);
            }
            List<Network> all = networkDao.loadAll();
            if (all != null && !all.isEmpty()) {
                Network network = all.get(0);
                markLastActivated(networkDao, network);
                log("VPN: reusing existing network " + network.getNetworkIdStr());
                return network;
            }
            long networkId = NetworkIdUtils.hexStringToLong(DEFAULT_VPN_NETWORK_ID);
            log("VPN: provisioning default network " + DEFAULT_VPN_NETWORK_ID);
            NetworkConfig networkConfig = new NetworkConfig();
            networkConfig.setId(Long.valueOf(networkId));
            networkConfig.setRouteViaZeroTier(false);
            networkConfig.setUseCustomDNS(false);
            networkConfigDao.insert(networkConfig);
            Network network = new Network();
            network.setNetworkId(Long.valueOf(networkId));
            network.setNetworkIdStr(DEFAULT_VPN_NETWORK_ID);
            network.setNetworkName("VPN");
            network.setUseDefaultRoute(false);
            network.setConnected(false);
            network.setNetworkConfigId(networkId);
            network.setLastActivated(true);
            networkDao.insert(network);
            return network;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    private void markLastActivated(NetworkDao networkDao, Network network) {
        List<Network> all = networkDao.loadAll();
        for (Network n : all) {
            boolean shouldBeActive = n.getNetworkId().equals(network.getNetworkId());
            if (n.getLastActivated() != shouldBeActive) {
                n.setLastActivated(shouldBeActive);
                networkDao.update(n);
            }
        }
    }
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onNodeStatus(NodeStatusEvent event) {
        if (!this.awaitingBackOneCheck || this.startState != 6) {
            return;
        }
        NodeStatus status = event.getStatus();
        if (status != null && status.isOnline()) {
            log("VPN online");
            finishBackOneCheckSuccess();
        }
    }
    private void onBackOneCheckTimeout() {
        if (!this.awaitingBackOneCheck || this.startState != 6) {
            return;
        }
        log("BackOne online check timed out");
        this.backOneCheckInProgress = false;
        showBackOneOfflineDialog();
    }
    private void finishBackOneCheckSuccess() {
        this.handler.removeCallbacks(this.backOneTimeoutRunnable);
        this.awaitingBackOneCheck = false;
        this.backOneCheckInProgress = false;
        dismissBackOneOfflineDialog();
        // TUN is up — set default ID/address from VPN IPv4 (verified-compatible).
        syncTunIdentity();
        continueInit();
    }
    private void showBackOneOfflineDialog() {
        if (this.backOneOfflineDialog != null && this.backOneOfflineDialog.isShowing()) {
            return;
        }
        this.backOneOfflineDialog = new AlertDialog.Builder(this)
            .setTitle(R.string.backone_offline_title)
            .setMessage(R.string.backone_offline_message)
            .setCancelable(false)
            .setPositiveButton(R.string.backone_open, (dialog, which) -> {
                startActivity(new Intent(this, NetworkListActivity.class));
            })
            .setNeutralButton(R.string.backone_retry, (dialog, which) -> {
                startBackOneOnlineCheck();
            })
            .setNegativeButton(R.string.backone_continue, (dialog, which) -> {
                finishBackOneCheckSuccess();
            })
            .show();
    }
    private void dismissBackOneOfflineDialog() {
        if (this.backOneOfflineDialog != null && this.backOneOfflineDialog.isShowing()) {
            this.backOneOfflineDialog.dismiss();
        }
        this.backOneOfflineDialog = null;
    }
    private void unregisterBackOneEvents() {
        this.handler.removeCallbacks(this.backOneTimeoutRunnable);
        if (this.eventBus.isRegistered(this)) {
            this.eventBus.unregister(this);
        }
    }
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        this.binder = (MainService.MainBinder) iBinder;
        log("onServiceConnected");
        if (this.startState == 0) {
            if (this.binder.isFirstStart()) {
                // show delayed splash page
                (new Handler()).postDelayed(() -> {
                    continueInit();
                }, 1000);
            } else {
                // show contact list as fast as possible
                continueInit();
            }
        }
    }
    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        this.binder = null;
    }
    @Override
    protected void onResume() {
        super.onResume();
        bindService(new Intent(this, MainService.class), this, Service.BIND_AUTO_CREATE);
        if (this.awaitingBackOneCheck && this.startState == 6 && !this.backOneCheckInProgress) {
            startBackOneOnlineCheck();
        }
    }
    @Override
    protected void onPause() {
        super.onPause();
        unbindService(this);
    }
    @Override
    protected void onDestroy() {
        unregisterBackOneEvents();
        dismissBackOneOfflineDialog();
        super.onDestroy();
    }
    private void syncTunIdentity() {
        if (this.binder == null || this.binder.getSettings() == null) {
            return;
        }
        if (Utils.syncIdentityFromTun(this.binder.getSettings())) {
            log("identity synced from TUN IPv4");
            try {
                this.binder.saveDatabase();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    private void showMissingAddressDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Setup");
        builder.setMessage("There is something to configure. Just tap skip button.");
        builder.setPositiveButton(R.string.ok, (DialogInterface dialog, int id) -> {
            showMissingAddressDialog();
            dialog.cancel();
        });
        builder.setNegativeButton(R.string.skip, (DialogInterface dialog, int id) -> {
            dialog.cancel();
            // continue with out address configuration
            continueInit();
        });
        builder.show();
    }
    // initial dialog to set the username
    private void showMissingUsernameDialog() {
        TextView tw = new TextView(this);
        tw.setText(R.string.name_prompt);
        //tw.setTextColor(Color.BLACK);
        tw.setTextSize(20);
        tw.setGravity(Gravity.CENTER_HORIZONTAL);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.addView(tw);
        EditText et = new EditText(this);
        et.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        et.setSingleLine(true);
        layout.addView(et);
        layout.setPadding(40, 80, 40, 40);
        //layout.setGravity(Gravity.CENTER_HORIZONTAL);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.hello);
        builder.setView(layout);
        builder.setNegativeButton(R.string.cancel, (dialogInterface, i) -> {
            this.binder.shutdown();
            finish();
        });
        InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
        builder.setPositiveButton(R.string.next, (dialogInterface, i) -> {
            // we will override this handler
        });
        AlertDialog dialog = builder.create();
        dialog.setOnShowListener((newDialog) -> {
            Button okButton = ((AlertDialog) newDialog).getButton(AlertDialog.BUTTON_POSITIVE);
            et.addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                    // nothing to do
                }
                @Override
                public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                    // nothing to do
                }
                @Override
                public void afterTextChanged(Editable editable) {
                    okButton.setClickable(editable.length() > 0);
                    okButton.setAlpha(editable.length() > 0 ? 1.0f : 0.5f);
                }
            });
            okButton.setClickable(false);
            okButton.setAlpha(0.5f);
            if (et.requestFocus()) {
                imm.showSoftInput(et, InputMethodManager.SHOW_IMPLICIT);
                //imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
            }
        });
        dialog.show();
        // override handler (to be able to dismiss the dialog manually)
        dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener((View v) -> {
            imm.toggleSoftInput(0, InputMethodManager.HIDE_IMPLICIT_ONLY);
            String username = et.getText().toString();
            if (Utils.isValidName(username)) {
                this.binder.getSettings().setUsername(username);
                try {
                    this.binder.saveDatabase();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                // close dialog
                dialog.dismiss();
                //dialog.cancel(); // needed?
                continueInit();
            } else {
                Toast.makeText(this, R.string.invalid_name, Toast.LENGTH_SHORT).show();
            }
        });
    }
    // ask for database password
    private void showDatabasePasswordDialog() {
        Dialog dialog = new Dialog(this);
        if (dialog.getWindow() != null) {
            dialog.getWindow().setFlags(
                android.view.WindowManager.LayoutParams.FLAG_SECURE,
                android.view.WindowManager.LayoutParams.FLAG_SECURE
            );
        }
        dialog.setContentView(R.layout.dialog_database_password);
        EditText passwordEditText = dialog.findViewById(R.id.PasswordEditText);
        Button exitButton = dialog.findViewById(R.id.ExitButton);
        Button okButton = dialog.findViewById(R.id.OkButton);
        okButton.setOnClickListener((View v) -> {
            String password = passwordEditText.getText().toString();
            this.binder.setDatabasePassword(password);
            this.binder.loadDatabase();
            if (this.binder.getDatabase() == null) {
                Toast.makeText(this, R.string.wrong_password, Toast.LENGTH_SHORT).show();
            } else {
                // close dialog
                dialog.dismiss();
                continueInit();
            }
        });
        exitButton.setOnClickListener((View v) -> {
            // shutdown app
            dialog.dismiss();
            this.binder.shutdown();
            finish();
        });
        dialog.show();
    }
    private void log(String s) {
        Log.d(this, s);
    }
 }
@@ -0,0 +1,578 @@
 package backone.cloud.call;
 import android.Manifest;
 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 import android.text.TextUtils;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.InterfaceAddress;
 import java.net.NetworkInterface;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 import java.util.regex.Pattern;
 class Utils {
    public static boolean hasReadPermission(Activity activity) {
        return (ContextCompat.checkSelfPermission(
                activity, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
    }
    public static boolean hasWritePermission(Activity activity) {
        return (ContextCompat.checkSelfPermission(
                activity, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
    }
    public static boolean hasCameraPermission(Activity activity) {
        return (ContextCompat.checkSelfPermission(
                activity, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED);
    }
    public static boolean hasMicPermission(Activity activity) {
        return ContextCompat.checkSelfPermission(
            activity, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED;
    }
    public static void requestMicPermission(Activity activity, int requestCode) {
        ActivityCompat.requestPermissions(activity, new String[]{
            Manifest.permission.RECORD_AUDIO}, requestCode);
    }
    public static void requestCameraPermission(Activity activity, int request_code) {
        ActivityCompat.requestPermissions(activity, new String[]{
                Manifest.permission.CAMERA}, request_code);
    }
    public static void requestReadPermission(Activity activity, int request_code) {
        ActivityCompat.requestPermissions(activity, new String[]{
                Manifest.permission.READ_EXTERNAL_STORAGE}, request_code);
    }
    public static void requestWritePermission(Activity activity, int request_code) {
        ActivityCompat.requestPermissions(activity, new String[]{
                Manifest.permission.WRITE_EXTERNAL_STORAGE}, request_code);
    }
    public static boolean allGranted(int[] grantResults) {
        if (grantResults == null || grantResults.length == 0) {
            return false;
        }
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }
    public static String getApplicationVersion(Context context) {
        try {
            PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
            return info.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return "";
    }
    public static String join(List<String> list) {
        return TextUtils.join(", ", list);
    }
    public static List<String> split(String str) {
        List<String> out = new ArrayList<>();
        if (str == null) {
            return out;
        }
        String[] parts = str.split("\\s*,\\s*");
        for (String part : parts) {
            if (part == null) {
                continue;
            }
            String trimmed = part.trim();
            if (!trimmed.isEmpty()) {
                out.add(trimmed);
            }
        }
        return out;
    }
    private static final Pattern NAME_PATTERN = Pattern.compile("[\\w _-]+");
    // check for a name that has no funny unicode characters to not let them look to much like other names
    public static boolean isValidName(String name) {
        if (name == null || name.length() == 0) {
            return false;
        }
        if (!name.equals(name.trim())) {
            return false;
        }
        return NAME_PATTERN.matcher(name).matches();
    }
    /** Default display name: "Ordal" plus 4 random alphanumeric characters. */
    public static String generateDefaultUsername() {
        final String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        java.security.SecureRandom random = new java.security.SecureRandom();
        StringBuilder suffix = new StringBuilder(4);
        for (int i = 0; i < 4; i += 1) {
            suffix.append(alphabet.charAt(random.nextInt(alphabet.length())));
        }
        return "Ordal" + suffix;
    }
    private final static char[] hexArray = "0123456789abcdef".toCharArray();
    public static String byteArrayToHexString(byte[] bytes) {
        if (bytes == null) {
            return "";
        }
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j += 1) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = hexArray[v >>> 4];
            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
        }
        return new String(hexChars);
    }
    public static byte[] hexStringToByteArray(String str) {
        if (str == null || str.length() == 0 || (str.length() % 2) != 0) {
            return null;
        }
        int len = str.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            int hi = Character.digit(str.charAt(i), 16);
            int lo = Character.digit(str.charAt(i + 1), 16);
            if (hi < 0 || lo < 0) {
                return null;
            }
            data[i / 2] = (byte) ((hi << 4) + lo);
        }
        return data;
    }
    public static InetSocketAddress parseInetSocketAddress(String addr, int defaultPort) {
        if (addr == null || addr.length() == 0) {
            return null;
        }
        try{
            if(isIPv6(addr)){
                return new InetSocketAddress(InetAddress.getByName("["+addr+"]"), defaultPort);
            } else {
                return new InetSocketAddress(InetAddress.getByName(addr), defaultPort);
            }
        } catch (Exception e) {
            return null;
        }
    }
    public static String bytesToMacAddress(byte[] mac) {
        StringBuilder sb = new StringBuilder();
        for (byte b : mac) {
            sb.append(String.format("%02X:", b));
        }
        if (sb.length() > 0) {
            sb.deleteCharAt(sb.length() - 1);
        }
        return sb.toString();
    }
    public static byte[] macAddressToBytes(String mac) {
        String[] elements = mac.split(":");
        byte[] array = new byte[elements.length];
        for (int i = 0; i < elements.length; i += 1) {
            array[i] = Integer.decode("0x" + elements[i]).byteValue();
        }
        return array;
    }
    // Check if MAC address is unicast/multicast
    public static boolean isMulticastMAC(byte[] mac) {
        return (mac[0] & 1) != 0;
    }
    // Check if MAC address is local/universal
    public static boolean isUniversalMAC(byte[] mac) {
        return (mac[0] & 2) == 0;
    }
    public static boolean isValidMAC(byte[] mac) {
        // we ignore the first byte (dummy mac addresses have the "local" bit set - resulting in 0x02)
        return ((mac != null)
                && (mac.length == 6)
                && ((mac[1] != 0x0) && (mac[2] != 0x0) && (mac[3] != 0x0) && (mac[4] != 0x0) && (mac[5] != 0x0))
        );
    }
    private static boolean isHexChar(char c) {
        return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
    }
    // check if a string is a MAC address (heuristic)
    public static boolean isMAC(String address) {
        if (address == null || address.length() != 17) {
            return false;
        }
        for (int i : new int[]{0, 1, 3, 4, 6, 7, 9, 10, 12, 13, 15, 16}) {
            if (!isHexChar(address.charAt(i))) {
                return false;
            }
        }
        for (int i : new int[]{2, 5, 8, 11, 14}) {
            if (address.charAt(i) != ':') {
                return false;
            }
        }
        return true;
    }
    private static final Pattern DOMAIN_PATTERN = Pattern.compile("[a-z0-9\\-.]+");
    // check if string is a domain (heuristic)
    public static boolean isDomain(String domain) {
        if (domain == null || domain.length() == 0) {
            return false;
        }
        if (domain.startsWith(".") || domain.endsWith(".")) {
            return false;
        }
        if (domain.contains("..") || !domain.contains(".")) {
            return false;
        }
        if (domain.startsWith("-") || domain.endsWith("-")) {
            return false;
        }
        if (domain.contains(".-") || domain.contains("-.")) {
            return false;
        }
        return DOMAIN_PATTERN.matcher(domain).matches();
    }
    private static final Pattern IPV4_PATTERN = Pattern.compile("^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");
    private static final Pattern IPV6_STD_PATTERN = Pattern.compile("^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");
    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern.compile("^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");
    // check if a string is an IP address (heuristic)
    public static boolean isIP(String address) {
        return IPV4_PATTERN.matcher(address).matches()
                || IPV6_STD_PATTERN.matcher(address).matches()
                || IPV6_HEX_COMPRESSED_PATTERN.matcher(address).matches();
    }
    public static boolean isIPv6(String address) {
        return IPV6_STD_PATTERN.matcher(address).matches()
                || IPV6_HEX_COMPRESSED_PATTERN.matcher(address).matches();
    }
    public static List<AddressEntry> collectAddresses() {
        ArrayList<AddressEntry> addressList = new ArrayList<>();
        try {
            List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface nif : all) {
                String vpn = nif.getName();
                if (nif.isLoopback()) {
                    continue;
                }
                for (InterfaceAddress ia : nif.getInterfaceAddresses()) {
                    InetAddress addr = ia.getAddress();
                    if (addr.isLoopbackAddress()) {
                        continue;
                    }
                    String fullAddress = addr.getHostAddress();
                    if(fullAddress.indexOf('%')>0){
                        String subaddress = fullAddress.substring(0, fullAddress.indexOf('%'));
                        if(isIPv6(subaddress)){
                            subaddress= subaddress;
                        }
                        if ((vpn.contains("tun"))) {
                            addressList.add(new AddressEntry(subaddress, nif.getName(), addr.isMulticastAddress()));
                        }
                    } else {
                        if(isIPv6(fullAddress)){
                            fullAddress= fullAddress;
                        }
                        if ((vpn.contains("tun"))) {
                            addressList.add(new AddressEntry(fullAddress, nif.getName(), addr.isMulticastAddress()));
                        }
                    }
                }
            }
        } catch (Exception ex) {
            // ignore
            log("error: " + ex);
        }
        return addressList;
    }
    /** Verified Bachot identity: public_key is the 4-byte TUN IPv4. */
    public static boolean isIpv4IdentityKey(byte[] key) {
        return key != null && key.length == 4;
    }
    public static String ipv4BytesToString(byte[] bytes) {
        if (!isIpv4IdentityKey(bytes)) {
            return null;
        }
        return String.format(Locale.US, "%d.%d.%d.%d",
            bytes[0] & 0xFF, bytes[1] & 0xFF, bytes[2] & 0xFF, bytes[3] & 0xFF);
    }
    public static byte[] ipv4StringToBytes(String ipv4) {
        if (ipv4 == null || !IPV4_PATTERN.matcher(ipv4).matches()) {
            return null;
        }
        try {
            byte[] bytes = InetAddress.getByName(ipv4).getAddress();
            if (bytes != null && bytes.length == 4) {
                return bytes;
            }
        } catch (Exception e) {
            // ignore
        }
        return null;
    }
    /** Prefer tun0 IPv4 for verified identity; fall back to any other tun* IPv4. */
    public static String getFirstTunIpv4() {
        String fallback = null;
        for (AddressEntry entry : collectAddresses()) {
            if (entry == null || entry.address == null || entry.multicast || entry.device == null) {
                continue;
            }
            if (!isIP(entry.address) || isIPv6(entry.address)) {
                continue;
            }
            if ("tun0".equals(entry.device)) {
                return entry.address;
            }
            if (fallback == null && entry.device.contains("tun")) {
                fallback = entry.address;
            }
        }
        return fallback;
    }
    /**
     * Set own public_key + addresses from tun0 IPv4 so QR/dial match verified builds.
     * @return true if settings were changed
     */
    public static boolean syncIdentityFromTun(Settings settings) {
        if (settings == null) {
            return false;
        }
        String ipv4 = getFirstTunIpv4();
        if (ipv4 == null) {
            return false;
        }
        byte[] identity = ipv4StringToBytes(ipv4);
        if (identity == null) {
            return false;
        }
        boolean changed = false;
        if (!Arrays.equals(settings.getPublicKey(), identity)) {
            settings.setPublicKey(identity);
            // IP-as-key peers use legacy plaintext signaling (no ed25519 secret).
            settings.setSecretKey(null);
            changed = true;
        }
        // Keep dial/QR address as the tun0 IPv4 only (verified ID).
        List<String> addresses = settings.getAddresses();
        if (addresses.size() != 1 || !ipv4.equalsIgnoreCase(addresses.get(0))) {
            addresses.clear();
            addresses.add(ipv4);
            changed = true;
        }
        return changed;
    }
    // list all IP/MAC addresses of running network interfaces - for debugging only
    public static void printOwnAddresses() {
        for (AddressEntry ae : collectAddresses()) {
            log("Address: " + ae.address + " (" + ae.device + (ae.multicast ? ", multicast" : "") + ")");
        }
    }
    // Check if the given MAC address is in the IPv6 address
    public static byte[] getEUI64MAC(Inet6Address addr6) {
        byte[] bytes = addr6.getAddress();
        if (bytes[11] != ((byte) 0xFF) || bytes[12] != ((byte) 0xFE)) {
            return null;
        }
        byte[] mac = new byte[6];
        mac[0] = (byte) (bytes[8] ^ 2);
        mac[1] = bytes[9];
        mac[2] = bytes[10];
        mac[3] = bytes[13];
        mac[4] = bytes[14];
        mac[5] = bytes[15];
        return mac;
    }
    /*
     * Replace the MAC address of an EUi64 scheme IPv6 address with another MAC address.
     * E.g.: ("fe80::aaaa:aaff:faa:aaa", "bb:bb:bb:bb:bb:bb") => "fe80::9bbb:bbff:febb:bbbb"
     */
    private static Inet6Address createEUI64Address(Inet6Address addr6, byte[] mac) {
        // addr6 is expected to be a EUI64 address
        try {
            byte[] bytes = addr6.getAddress();
            bytes[8] = (byte) (mac[0] ^ 2);
            bytes[9] = mac[1];
            bytes[10] = mac[2];
            // already set, but doesn't harm
            bytes[11] = (byte) 0xFF;
            bytes[12] = (byte) 0xFE;
            bytes[13] = mac[3];
            bytes[14] = mac[4];
            bytes[15] = mac[5];
            return Inet6Address.getByAddress(null, bytes, addr6.getScopeId());
        } catch (UnknownHostException e) {
            return null;
        }
    }
    /*
     * Iterate all device addresses, check if they conform to the EUI64 scheme.
     * If yes, replace the MAC address in it with the supplied one and return that address.
     * Also set the given port for those generated addresses.
     */
    public static List<InetSocketAddress> getAddressPermutations(String contact_mac, int port) {
        byte[] contact_mac_bytes = Utils.macAddressToBytes(contact_mac);
        ArrayList<InetSocketAddress> addrs = new ArrayList<InetSocketAddress>();
        try {
            List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface nif : all) {
                if (nif.isLoopback()) {
                    continue;
                }
                for (InterfaceAddress ia : nif.getInterfaceAddresses()) {
                    InetAddress addr = ia.getAddress();
                    if (addr.isLoopbackAddress()) {
                        continue;
                    }
                    if (addr instanceof Inet6Address) {
                        Inet6Address addr6 = (Inet6Address) addr;
                        byte[] extracted_mac = getEUI64MAC(addr6);
                        if (extracted_mac != null && Arrays.equals(extracted_mac, nif.getHardwareAddress())) {
                            // We found the interface MAC address in the IPv6 assigned to that interface in the EUI-64 scheme.
                            // Now assume that the contact has an address with the same scheme.
                            InetAddress new_addr = createEUI64Address(addr6, contact_mac_bytes);
                            if (new_addr != null) {
                                addrs.add(new InetSocketAddress(new_addr, port));
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return addrs;
    }
    // EUI-64 based address to MAC address
    public static String getGeneralizedAddress(InetAddress address) {
        if (address == null) {
            return "";
        }
        if (address instanceof Inet6Address) {
            // if the IPv6 address contains a MAC address, take that.
            byte[] mac = Utils.getEUI64MAC((Inet6Address) address);
            if (mac != null) {
                return Utils.bytesToMacAddress(mac);
            }
        }
        String host = address.getHostAddress();
        return host != null ? host : "";
    }
    // write file to external storage
    public static void writeExternalFile(String filepath, byte[] data) throws IOException {
        File file = new File(filepath);
        if (file.exists() && file.isFile()) {
            if (!file.delete()) {
                throw new IOException("Failed to delete existing file: " + filepath);
            }
        }
        file.createNewFile();
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(data);
        fos.close();
    }
    // read file from external storage
    public static byte[] readExternalFile(String filepath) throws IOException {
        File file = new File(filepath);
        if (!file.exists() || !file.isFile()) {
            throw new IOException("File does not exist: " + filepath);
        }
        FileInputStream fis = new FileInputStream(file);
        int nRead;
        byte[] data = new byte[16384];
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        while ((nRead = fis.read(data, 0, data.length)) != -1) {
            buffer.write(data, 0, nRead);
        }
        fis.close();
        return buffer.toByteArray();
    }
    private static void log(String s) {
        Log.d(Utils.class.getSimpleName(), s);
    }
 }
@@ -0,0 +1,141 @@
 package backone.cloud.call.util;
 import org.webrtc.RTCStats;
 import org.webrtc.RTCStatsReport;
 import java.math.BigInteger;
 import java.util.Map;
 /**
 * @Author Vadym Vikulin
 * @Date 2021/10/10
 * @desc
 */
 public class StatsReportUtil {
    private final static int STATS_INTERVAL_MS = 5000;
    private BigInteger lastBytesReceivedVideo = BigInteger.valueOf(0);
    private BigInteger lastBytesSentVideo = BigInteger.valueOf(0);
    private BigInteger lastBytesReceivedAudio = BigInteger.valueOf(0);
    private BigInteger lastBytesSentAudio = BigInteger.valueOf(0);
    private long lastFrameDecoded = 0L;
    public String getStatsReport(RTCStatsReport report) {
        if (report == null || report.getStatsMap() == null) {
            return "";
        }
        String codecIdVideo = null;
        String codecIdAudio = null;
        String codecVideo = "";
        String codecAudio = "";
        long receivedBytesSRVideo = 0;
        long sentBytesSRVideo = 0;
        long receivedBytesSRAudio = 0;
        long sentBytesSRAudio = 0;
        long width = 0, height = 0;
        long frameRate = 0;
        try {
            for (RTCStats stats : report.getStatsMap().values()) {
                if (stats == null || stats.getMembers() == null) {
                    continue;
                }
                Map<String, Object> members = stats.getMembers();
                String type = stats.getType();
                if ("inbound-rtp".equals(type)) {
                    String mediaType = asString(members.get("mediaType"));
                    if ("video".equals(mediaType)) {
                        codecIdVideo = asString(members.get("codecId"));
                        BigInteger bytes = asBigInteger(members.get("bytesReceived"));
                        if (bytes != null) {
                            receivedBytesSRVideo = bytes.longValue() - lastBytesReceivedVideo.longValue();
                            lastBytesReceivedVideo = bytes;
                        }
                        Long currentFrame = asLong(members.get("framesDecoded"));
                        if (currentFrame != null) {
                            frameRate = (currentFrame - lastFrameDecoded) * 1000L / STATS_INTERVAL_MS;
                            lastFrameDecoded = currentFrame;
                        }
                    } else if ("audio".equals(mediaType)) {
                        codecIdAudio = asString(members.get("codecId"));
                        BigInteger bytes = asBigInteger(members.get("bytesReceived"));
                        if (bytes != null) {
                            receivedBytesSRAudio = bytes.longValue() - lastBytesReceivedAudio.longValue();
                            lastBytesReceivedAudio = bytes;
                        }
                    }
                } else if ("outbound-rtp".equals(type)) {
                    String mediaType = asString(members.get("mediaType"));
                    if ("video".equals(mediaType)) {
                        BigInteger bytes = asBigInteger(members.get("bytesSent"));
                        if (bytes != null) {
                            sentBytesSRVideo = bytes.longValue() - lastBytesSentVideo.longValue();
                            lastBytesSentVideo = bytes;
                        }
                    } else if ("audio".equals(mediaType)) {
                        BigInteger bytes = asBigInteger(members.get("bytesSent"));
                        if (bytes != null) {
                            sentBytesSRAudio = bytes.longValue() - lastBytesSentAudio.longValue();
                            lastBytesSentAudio = bytes;
                        }
                    }
                } else if ("track".equals(type)) {
                    if ("video".equals(asString(members.get("kind")))) {
                        Long w = asLong(members.get("frameWidth"));
                        Long h = asLong(members.get("frameHeight"));
                        width = w != null ? w : 0;
                        height = h != null ? h : 0;
                    }
                }
            }
            if (codecIdVideo != null) {
                RTCStats codecStats = report.getStatsMap().get(codecIdVideo);
                if (codecStats != null && codecStats.getMembers() != null) {
                    String mime = asString(codecStats.getMembers().get("mimeType"));
                    if (mime != null) {
                        codecVideo = mime;
                    }
                }
            }
            if (codecIdAudio != null) {
                RTCStats codecStats = report.getStatsMap().get(codecIdAudio);
                if (codecStats != null && codecStats.getMembers() != null) {
                    String mime = asString(codecStats.getMembers().get("mimeType"));
                    if (mime != null) {
                        codecAudio = mime;
                    }
                }
            }
        } catch (Exception e) {
            return "";
        }
        return "Codecs: " + codecVideo + " " + codecAudio
                + "\nResolution: " + width + "x" + height
                + "\nBitrate ⎚ ↓: " + receivedBytesSRVideo * 8 / STATS_INTERVAL_MS + "kbps"
                + "\nBitrate ⎚ ↑: " + sentBytesSRVideo * 8 / STATS_INTERVAL_MS + "kbps"
                + "\nBitrate \uD83D\uDD0A ↓: " + receivedBytesSRAudio * 8 / STATS_INTERVAL_MS + "kbps"
                + "\nBitrate \uD83D\uDD0A ↑: " + sentBytesSRAudio * 8 / STATS_INTERVAL_MS + "kbps"
                + "\nFrameRate: " + frameRate;
    }
    private static String asString(Object value) {
        return value instanceof String ? (String) value : null;
    }
    private static Long asLong(Object value) {
        if (value instanceof Number) {
            return ((Number) value).longValue();
        }
        return null;
    }
    private static BigInteger asBigInteger(Object value) {
        if (value instanceof BigInteger) {
            return (BigInteger) value;
        }
        if (value instanceof Number) {
            return BigInteger.valueOf(((Number) value).longValue());
        }
        return null;
    }
 }
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            android:textSize="15dp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:text="@string/about_info"
            android:textColor="?attr/primaryTextColor"
            android:textSize="15dp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/app_info"
            android:textColor="?attr/secondaryTextColor"
            android:textSize="15dp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:text="@string/about_source"
            android:textColor="?attr/primaryTextColor"
            android:textSize="15dp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:autoLink="web"
            android:text="@string/source_link"
            android:textSize="15dp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:text="@string/about_license"
            android:textColor="?attr/primaryTextColor"
            android:textSize="15dp" />
        <TextView
            android:id="@+id/licenseTV"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/about_license_version"
            android:textColor="?attr/secondaryTextColor"
            android:textSize="15dp" />
    </LinearLayout>
 </ScrollView>
@@ -0,0 +1,148 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp"
    android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/qr_code_address_list"
        android:textColor="?attr/primaryTextColor"
        android:textSize="25sp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:orientation="horizontal">
        <Spinner
            android:id="@+id/StoredAddressSpinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center_vertical" />
        <Button
            android:id="@+id/PickStoredAddressButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/pick" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:orientation="horizontal">
        <EditText
            android:id="@+id/AddressEditText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:inputType="textNoSuggestions"
            android:textAlignment="center"
            android:autofillHints="" />
        <Button
            android:id="@+id/AddButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/button_add" />
        <Button
            android:id="@+id/RemoveButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.3"
            android:text="@string/button_remove" />
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:background="@android:color/darker_gray" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/currently_active"
        android:textColor="?attr/primaryTextColor"
        android:textSize="25sp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Spinner
            android:id="@+id/SystemAddressSpinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center_vertical" />
        <Button
            android:id="@+id/PickSystemAddressButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/pick" />
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:background="@android:color/darker_gray" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/address_management_help_text"
            android:textColor="?attr/primaryTextColor"
            android:textSize="15sp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="bottom"
        android:orientation="horizontal">
        <Button
            android:id="@+id/AbortButton"
            style="?android:attr/buttonBarButtonStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_weight="1"
            android:text="@string/button_abort" />
        <Button
            android:id="@+id/SaveButton"
            style="?android:attr/buttonBarButtonStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="2dp"
            android:layout_weight="1"
            android:text="@string/button_save" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,26 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp">
     <TextView android:id="@+id/label"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
         android:layout_marginTop="2dp"
        android:layout_marginBottom="2dp" />
     <ImageView android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:gravity="center_vertical"
         android:layout_marginStart="15dp"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
         android:contentDescription="TODO" />
 </LinearLayout>
@@ -0,0 +1,152 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CallActivity">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <org.webrtc.SurfaceViewRenderer
            android:id="@+id/localRenderer"
            android:layout_width="150dp"
            android:layout_height="195dp"
            android:layout_gravity="center"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:layout_marginBottom="80dp"
            android:visibility="gone">
        </org.webrtc.SurfaceViewRenderer>
        <org.webrtc.SurfaceViewRenderer
            android:id="@+id/remoteRenderer"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="?attr/backgroundCardColor"
            />
        <TextView
            android:id="@+id/callStats"
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="80dp"
            android:layout_marginStart="10dp"
            android:lines="11"
            android:text="Statistic..."
            android:textColor="@android:color/holo_green_light"
            android:textSize="15sp"
            android:background="@color/colorBackgroundDark"
            android:alpha="0.6"
 			android:visibility="gone"
            />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="40dp"
            android:gravity="center_horizontal"
            android:orientation="vertical">
            <TextView
                android:id="@+id/callName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="CallerName"
                android:textColor="?attr/primaryTextColor"
                android:textSize="30sp" />
            <TextView
                android:id="@+id/callStatus"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/call_connecting"
                android:textColor="?attr/secondaryTextColor"
                android:textSize="20sp" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:paddingBottom="10dp">
            <ImageButton
                android:id="@+id/callAccept"
                android:layout_width="@dimen/call_button_size"
                android:layout_height="@dimen/call_button_size"
                android:layout_marginEnd="30dp"
                android:background="@drawable/accept_button_round"
                android:padding="@dimen/call_button_image_padding"
                android:scaleType="fitXY"
                android:src="@drawable/baseline_phone_black_48"
                android:visibility="gone"
                android:contentDescription="TODO" />
            <ImageButton
                android:id="@+id/callDecline"
                android:layout_width="@dimen/call_button_size"
                android:layout_height="@dimen/call_button_size"
                android:background="@drawable/accept_button_round"
                android:padding="@dimen/call_button_image_padding"
                android:scaleType="fitXY"
                android:src="@drawable/baseline_phone_missed_black_48"
                android:contentDescription="TODO" />
            <RelativeLayout
                android:layout_width="@dimen/call_button_size"
                android:layout_height="@dimen/call_button_size"
                android:layout_marginStart="30dp"
 				android:visibility="gone"
                android:id="@+id/videoStreamSwitchLayout">
                <ImageButton
                    android:id="@+id/videoStreamSwitch"
                    android:layout_width="@dimen/call_button_size"
                    android:layout_height="@dimen/call_button_size"
                    android:background="@drawable/accept_button_round"
                    android:padding="@dimen/call_button_image_padding"
                    android:scaleType="fitXY"
                    android:src="@drawable/baseline_camera_alt_black_48"
                    android:contentDescription="TODO" />
            </RelativeLayout>
            <ImageButton
                android:id="@+id/frontFacingSwitch"
                android:layout_width="@dimen/call_button_size"
                android:layout_height="@dimen/call_button_size"
                android:layout_marginStart="30dp"
                android:background="@drawable/accept_button_round"
                android:padding="@dimen/call_button_image_padding"
                android:scaleType="fitXY"
                android:src="@drawable/baseline_switch_camera_black_48"
                android:visibility="gone"
                android:contentDescription="TODO" />
            <ImageButton
                android:id="@+id/speakerMode"
                android:layout_width="@dimen/call_button_size"
                android:layout_height="@dimen/call_button_size"
                android:layout_marginStart="30dp"
                android:background="@drawable/accept_button_round"
                android:padding="@dimen/call_button_image_padding"
                android:scaleType="fitXY"
                android:src="@android:drawable/ic_lock_silent_mode_off"
                android:alpha="0.6"
                android:visibility="gone"
                android:contentDescription="TODO" />
        </LinearLayout>
    </RelativeLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>
@@ -0,0 +1,33 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LicenseActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_margin="10dp">
        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:id="@+id/licenseLoadingBar"/>
        <TextView
            android:id="@+id/licenceText"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:padding="6dp"
            android:textAlignment="center"
            android:textColor="?attr/secondaryTextColor"
            android:textSize="10dp" />
       </LinearLayout>
 </ScrollView>
@@ -0,0 +1,30 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">
    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
    </com.google.android.material.appbar.AppBarLayout>
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/swipe_refresh">
    <include
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        layout="@layout/fragment_contact_list"/>
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 </androidx.coordinatorlayout.widget.CoordinatorLayout>
@@ -0,0 +1,37 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".QRScanActivity">
    <com.journeyapps.barcodescanner.DecoratedBarcodeView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/barcodeScannerView">
    </com.journeyapps.barcodescanner.DecoratedBarcodeView>
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabManualInput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_above="@id/fabScan"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_menu_edit"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabScan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/qr_code"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
 </RelativeLayout>
@@ -0,0 +1,41 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".QRShowActivity">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/QRView"
        android:contentDescription="TODO" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabShare"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/fabPresenter"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="@dimen/fab_margin"
        android:layout_marginTop="@dimen/fab_margin"
        android:layout_marginEnd="101dp"
        android:layout_marginBottom="-77dp"
        android:background="@color/colorPrimary"
        app:srcCompat="@android:drawable/ic_menu_share"
        android:contentDescription="TODO" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabPresenter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/qr_glass"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
 </RelativeLayout>
@@ -0,0 +1,255 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SettingsActivity">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <LinearLayout
                android:id="@+id/changeNameLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_change_name"
                    android:textColor="?attr/primaryTextColor"
                    android:textSize="25dp" />
                <TextView
                    android:id="@+id/nameTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="?attr/secondaryTextColor"
                    android:textSize="15dp" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/changeLocaleLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_change_language"
                    android:textSize="25dp"
                    android:textColor="?attr/primaryTextColor" />
                <TextView
                    android:id="@+id/localeTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="15dp"
                    android:textColor="?attr/secondaryTextColor" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/changeAddressLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_change_address"
                    android:textColor="?attr/primaryTextColor"
                    android:textSize="25dp" />
                <TextView
                    android:id="@+id/addressTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="?attr/secondaryTextColor"
                    android:textSize="15dp" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/changePasswordLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_change_password"
                    android:textColor="?attr/primaryTextColor"
                    android:textSize="25dp" />
                <TextView
                    android:id="@+id/passwordTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="?attr/secondaryTextColor"
                    android:textSize="15dp" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/changeIceServersLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:visibility="gone"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_change_ice_servers"
                    android:textColor="?attr/primaryTextColor"
                    android:textSize="25dp" />
                <TextView
                    android:id="@+id/iceServersTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="?attr/secondaryTextColor"
                    android:text="stun:10.10.10.30:8090"
                    android:textSize="15dp" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/backoneNetworkLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:orientation="vertical">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_backone_network"
                    android:textColor="?attr/primaryTextColor"
                    android:textSize="25dp" />
                <TextView
                    android:id="@+id/backoneStatusTv"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/backone_status_offline"
                    android:textColor="?attr/secondaryTextColor"
                    android:textSize="15dp" />
            </LinearLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_toStartOf="@+id/checkBoxLegacyCompatibility"
                    android:layout_alignParentStart="true"
                    android:text="@string/settings_legacy_compatibility"
                    android:textSize="25dp"
                    android:textColor="?attr/primaryTextColor" />
                <CheckBox
                    android:id="@+id/checkBoxLegacyCompatibility"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentEnd="true"
                    android:layout_margin="5dp" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
 				android:visibility="gone">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_block_unknown"
                    android:textSize="25dp"
                    android:textColor="?attr/primaryTextColor" />
                <CheckBox
                    android:id="@+id/checkBoxBlockUnknown"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentEnd="true"
                    android:layout_margin="5dp" />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
 	            android:visibility="gone">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_nightmode"
                    android:textSize="25dp"
                    android:textColor="?attr/primaryTextColor"  />
                <CheckBox
                    android:id="@+id/checkBoxNightMode"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentEnd="true"
                    android:layout_margin="5dp"
                    android:textColor="?attr/secondaryTextColor"  />
            </RelativeLayout>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
 				android:visibility="gone">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/settings_development_mode"
                    android:textSize="25dp"
                    android:textColor="?attr/primaryTextColor"  />
                <CheckBox
                    android:id="@+id/checkBoxDevelopmentMode"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentEnd="true"
                    android:layout_margin="5dp"
                    android:textColor="?attr/secondaryTextColor"  />
            </RelativeLayout>
        </LinearLayout>
    </RelativeLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>
@@ -0,0 +1,44 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"
    android:orientation="vertical">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.6"
        android:background="#FFEC3E3E">
        <ImageView
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:src="@drawable/logo_splash"
            android:contentDescription="TODO" />
    </RelativeLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.4"
        android:background="@android:color/white">
        <ImageView
            android:layout_width="294dp"
            android:layout_height="120dp"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="170dp"
            android:contentDescription="TODO"
            android:src="@drawable/logo_splash"
            app:srcCompat="@drawable/bachot_label" />
    </RelativeLayout>
 </LinearLayout>
@@ -0,0 +1,52 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="320dp"
    android:layout_height="200dp"
    android:padding="20dp"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp"
        android:layout_marginLeft="5dp"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp"
        android:text="@string/enter_contact_name" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/nameEditText"
        android:layout_margin="10dp"
        android:importantForAutofill="no" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
         <Button
            android:id="@+id/ExitButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="3dp"
            android:text="@string/exit"
             style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/OkButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/ok"
            style="?android:attr/buttonBarButtonStyle" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,60 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320dp"
    android:layout_height="200dp"
    android:padding="20dp"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp"
        android:layout_marginStart="5dp"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp"
        android:text="@string/contact_name_conflict" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/NameEditText"
        android:layout_margin="10dp"
        android:importantForAutofill="no" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
         <Button
            android:id="@+id/AbortButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="3dp"
            android:text="@string/button_abort"
             style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/ReplaceButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/button_replace"
            style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/RenameButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/button_rename"
            style="?android:attr/buttonBarButtonStyle" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,50 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320dp"
    android:layout_height="200dp"
    android:padding="20dp"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp"
        android:layout_marginStart="5dp"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp"
        android:text="@string/contact_key_conflict" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/NameTextView"
        android:layout_margin="10dp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
         <Button
            android:id="@+id/AbortButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="3dp"
            android:text="@string/button_abort"
             style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/ReplaceButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/button_replace"
            style="?android:attr/buttonBarButtonStyle" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,59 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="320dp"
    android:layout_height="200dp"
    android:padding="20dp"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp"
        android:layout_marginStart="5dp"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp"
        android:text="@string/enter_password" />
    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:passwordToggleEnabled="true"
        android:layout_margin="10dp" >
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/PasswordEditText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword" />
    </com.google.android.material.textfield.TextInputLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
         <Button
            android:id="@+id/ExitButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
             android:layout_marginEnd="3dp"
            android:text="@string/exit"
             style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/OkButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/ok"
            style="?android:attr/buttonBarButtonStyle" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,51 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320dp"
    android:layout_height="200dp"
    android:padding="20dp"
    android:orientation="vertical" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="15dp"
        android:layout_marginStart="5dp"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp"
        android:text="@string/set_ice_servers_description" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/iceServersEditText"
        android:layout_margin="10dp"
        android:importantForAutofill="no" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
         <Button
            android:id="@+id/AbortButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginEnd="3dp"
            android:text="@string/button_abort"
             style="?android:attr/buttonBarButtonStyle" />
        <Button
            android:id="@+id/SaveButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginStart="3dp"
            android:text="@string/button_save"
            style="?android:attr/buttonBarButtonStyle" />
    </LinearLayout>
 </LinearLayout>
@@ -0,0 +1,66 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:id="@+id/ownStatusText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingStart="12dp"
            android:paddingEnd="12dp"
            android:paddingTop="8dp"
            android:paddingBottom="4dp"
            android:text="@string/own_status_checking"
            android:textColor="?attr/secondaryTextColor"
            android:textSize="14sp" />
        <ListView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:layout_margin="5dp"
            android:id="@+id/contactList"/>
    </LinearLayout>
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabScan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/qr_glass"
        android:visibility="gone"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabGenerate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/qr_code"
        android:visibility="gone"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/qr_glass"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
 </FrameLayout>
@@ -0,0 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:id="@+id/eventList"/>
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabDelete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@drawable/delete"
        android:background="@color/colorPrimary"
        android:contentDescription="TODO" />
 </FrameLayout>
@@ -0,0 +1,65 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true"
        android:layout_marginStart="0dp"
        android:orientation="vertical">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <TextView
                android:id="@+id/contact_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="5.5dp"
                android:textColor="?attr/primaryTextColor"
                android:textSize="30dp" />
        </LinearLayout>
    </LinearLayout>
    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:padding="6dp"
        android:id="@+id/contact_waiting"/>
    <ImageView
        android:id="@+id/contact_state"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:contentDescription="TODO"
        android:visibility="visible"
        app:srcCompat="@drawable/secure_red" />
    <ImageView
        android:id="@+id/contact_online"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:contentDescription="TODO"
        android:visibility="gone"
        app:srcCompat="@drawable/secure_green" />
 </RelativeLayout>
@@ -0,0 +1,63 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginStart="20dp"
        android:layout_alignParentStart="true" >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:orientation="horizontal">
            <TextView
                android:id="@+id/call_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="30sp"
                android:layout_marginTop="5.5dp"
                android:textColor="?attr/primaryTextColor" />
            <ImageView
                android:id="@+id/call_type"
                android:layout_width="20dp"
                android:layout_height="20dp"
                android:layout_gravity="center"
                android:src="@drawable/call_incoming"
                android:layout_margin="8dp"
                android:contentDescription="TODO" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <TextView
                android:id="@+id/call_date"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="15sp"
                android:textColor="?attr/secondaryTextColor" />
            <TextView
                android:id="@+id/call_address"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="10dp"
                android:textSize="12sp"
                android:textColor="?attr/secondaryTextColor" />
        </LinearLayout>
    </LinearLayout>
 </RelativeLayout>
@@ -0,0 +1,21 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">
    <item
        android:id="@+id/action_settings"
        app:showAsAction="never"
        android:title="@string/menu_settings"/>
    <item
        android:id="@+id/action_backup"
        app:showAsAction="never"
        android:title="@string/menu_backup"/>
    <item
        android:id="@+id/action_about"
        app:showAsAction="never"
        android:title="@string/menu_about"/>
 </menu>
@@ -0,0 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
    <declare-styleable name="CTAppTheme">
        <attr name="primaryTextColor" format="color"/>
        <attr name="secondaryTextColor" format="color"/>
        <attr name="backgroundCardColor" format="color"/>
        <attr name="iconPlaceholder" format="integer"/>
    </declare-styleable>
 </resources>
@@ -0,0 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
    <color name="colorPrimary">#FFEC3E3E</color>
    <color name="colorPrimaryDark">#5A4098</color>
    <color name="colorAccent">#FFEC3E3E</color>
    <color name="colorBackgroundDark">#33343B</color>
    <color name="colorTextDarkPrimary">@android:color/primary_text_dark</color>
    <color name="colorTextDarkSecondary">@android:color/secondary_text_dark</color>
 </resources>
@@ -0,0 +1,5 @@
 <resources>
    <dimen name="fab_margin">20dp</dimen>
    <dimen name="call_button_size">60dp</dimen>
    <dimen name="call_button_image_padding">10dp</dimen>
 </resources>
@@ -0,0 +1,95 @@
 <resources>
    <string name="app_name" translatable="false">BaChot</string>
    <string name="name_prompt">nama yang muncul di kontak ?</string>
    <string name="scan_invitation">Scan QR-Code</string>
    <string name="scan_invited">QR-Code Scanning</string>
    <string name="paste_invitation">Paste QR-Code MetaData</string>
    <string name="invalid_data">input Invalid</string>
    <string name="invalid_name">nama Invalid</string>
    <string name="cancel">Batal</string>
    <string name="next">Lanjut</string>
    <string name="enter_password">password</string>
    <string name="camera_permission_request">Ijinkan Camera untuk scan codes</string>
    <string name="invalid_qr">Invalid QR-Code</string>
    <string name="contact_has_no_address_warning">Warning: Kontak tidak terverifikasi</string>
    <string name="menu_settings">Settings</string>
    <string name="menu_license">License</string>
    <string name="menu_backup">Backup</string>
    <string name="menu_about">About</string>
    <string name="call_connecting">Memanggil</string>
    <string name="unknown_caller">Tidak dikenal</string>
    <string name="settings_change_name">Rubah Nama</string>
    <string name="settings_change_language">Bahasa</string>
    <string name="settings_change_address">Rubah ID</string>
    <string name="settings_change_password">Ganti Password</string>
    <string name="settings_change_ice_servers">ICE ID</string>
    <string name="settings_backone_network">VPN</string>
    <string name="backone_status_online">Online</string>
    <string name="backone_status_offline">Offline</string>
    <string name="own_status_checking">Memeriksa koneksi…</string>
    <string name="own_status_ready">Siap — menerima panggilan</string>
    <string name="own_status_in_call">Dalam panggilan</string>
    <string name="own_status_not_listening">Tidak aktif — port tidak tersedia</string>
    <string name="own_status_vpn_online">VPN online</string>
    <string name="own_status_vpn_offline">VPN offline</string>
    <string name="backone_offline_title">VPN Offline</string>
    <string name="backone_offline_message">VPN network is not online. Join or start a network to use BaChot over VPN.</string>
    <string name="backone_open">Open VPN</string>
    <string name="backone_retry">Retry</string>
    <string name="backone_continue">Continue</string>
    <string name="settings_nightmode">Night Mode</string>
    <string name="settings_block_unknown">Block Unknown Callers</string>
    <string name="settings_legacy_compatibility">Legacy Compatibility</string>
    <string name="settings_legacy_compatibility_summary">Allow calls with older Bachot that use unencrypted signaling</string>
    <string name="settings_development_mode">Development Mode</string>
    <string name="about_source">x</string>
    <string name="source_link" translatable="false">x</string>
    <string name="about_license">x</string>
    <string name="about_license_version">x</string>
    <string name="none">None</string>
    <string name="add">Add</string>
    <string name="delete">Delete</string>
    <string name="rename">Rename</string>
    <string name="share">Share</string>
    <string name="block">Block</string>
    <string name="unblock">Unblock</string>
    <string name="pick">Take</string>
    <string name="confirm">Confirm</string>
    <string name="done">Done</string>
    <string name="contact_edit">Edit Contact</string>
    <string name="permission_mic">Ijinkan Microphone untuk menggadakan percakapan</string>
    <string name="hello">Hello!</string>
    <string name="empty_list_item">Empty</string>
    <string name="set_ice_servers_description">Set public ICE servers that help to traverse network boundaries.</string>
    <string name="ice_turn_warning">TURN servers can see and relay call traffic. Prefer STUN-only servers when possible.</string>
    <string name="call_connected">Terhubung</string>
    <string name="call_denied">Ditolak</string>
    <string name="call_ringing">Ada Panggilan</string>
    <string name="call_ended">Selesai</string>
    <string name="call_error">ada kesalahan</string>
    <string name="button_abort">Batal</string>
    <string name="button_rename">Rubah</string>
    <string name="button_replace">Ganti</string>
    <string name="button_save">Simpan</string>
    <string name="button_add">Add</string>
    <string name="button_remove">Hapus</string>
    <string name="about_version">App Version:</string>
    <string name="about_info">App Info:</string>
    <string name="app_info">App untuk perbincangan suara tanpa server</string>
    <string name="address_management">Address Management</string>
    <string name="qr_code_address_list">QR-Code Address List</string>
    <string name="currently_active">Currently Active</string>
    <string name="address_management_help_text">pilih salah satu sebagai ID</string>
    <string name="enter_contact_name">Enter contact name.</string>
    <string name="wrong_password">Wrong password</string>
    <string name="contact_name_conflict">Sudah ada kontak dengan nama tersebut.</string>
    <string name="contact_key_conflict">Sudah ada kontak dengan nama tersebut.</string>
    <string name="contact_name_empty">nama tidak boleh tidak diisi.</string>
    <string name="contact_name_exists">Sudah ada kontak dengan nama tersebut.</string>
    <string name="contact_remove">Hapus kontak?</string>
    <string name="ok">Ok</string>
    <string name="skip">Skip</string>
    <string name="exit">Exit</string>
    <string name="yes">Ya</string>
    <string name="no">Tidak</string>
 </resources>
@@ -0,0 +1,27 @@
 <resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
    <style name="AppTheme.Light" parent="AppTheme">
        <item name="primaryTextColor">@android:color/black</item>
        <item name="secondaryTextColor">@android:color/darker_gray</item>
        <item name="android:windowBackground">@android:color/background_light</item>
        <item name="backgroundCardColor">@android:color/background_light</item>
    </style>
    <style name="AppTheme.Dark" parent="AppTheme">
        <item name="primaryTextColor">@color/colorTextDarkPrimary</item>
        <item name="secondaryTextColor">@color/colorTextDarkSecondary</item>
        <item name="android:windowBackground">@color/colorBackgroundDark</item>
        <item name="backgroundCardColor">@color/colorBackgroundDark</item>
    </style>
    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
 </resources>
@@ -0,0 +1,54 @@
 plugins {
    id 'com.android.library'
    id 'org.greenrobot.greendao'
 }
 greendao {
    schemaVersion 22
    daoPackage 'cloud.backone.backoneconnect.model'
 }
 android {
    namespace 'cloud.backone.backoneconnect'
    compileSdkVersion 34
    defaultConfig {
        minSdkVersion 26
        targetSdkVersion 34
        multiDexEnabled true
        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
        consumerProguardFiles 'proguard-rules.pro'
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }
    configurations {
        all {
            exclude module: 'httpclient'
            exclude module: 'commons-logging'
        }
    }
 }
 dependencies {
    implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.12.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.navigation:navigation-fragment:2.8.3'
    implementation 'androidx.navigation:navigation-ui:2.8.3'
    implementation 'androidx.preference:preference:1.2.1'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.recyclerview:recyclerview:1.3.2'
    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
    implementation 'commons-io:commons-io:2.11.0'
    api 'org.greenrobot:greendao:3.3.0'
    api 'org.greenrobot:eventbus:3.3.1'
    implementation 'commons-validator:commons-validator:1.7'
    api 'androidx.multidex:multidex:2.0.1'
    implementation 'me.dm7.barcodescanner:zxing:1.9.8'
    compileOnly 'org.projectlombok:lombok:1.18.20'
    annotationProcessor 'org.projectlombok:lombok:1.18.20'
 }
@@ -0,0 +1 @@
 o/out
@@ -0,0 +1,67 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cloud.backone.backoneconnect" >
    <uses-sdk android:minSdkVersion="26" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application>
        <service
            android:name="cloud.backone.backoneconnect.service.ZeroTierOneService"
            android:enabled="true"
            android:exported="false"
            android:foregroundServiceType="specialUse"
            android:permission="android.permission.BIND_VPN_SERVICE" >
            <intent-filter>
                <action android:name="android.net.VpnService" />
            </intent-filter>
            <property
                android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
                android:value="VPN tunnel" />
        </service>
        <activity
            android:name="cloud.backone.backoneconnect.ui.NetworkListActivity"
            android:exported="false"
            android:label="@string/backone_network"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.JoinNetworkActivity"
            android:label="@string/join_network"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.PrefsActivity"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.NetworkDetailActivity"
            android:label="@string/network_detail"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.MoonOrbitActivity"
            android:label="@string/moon_orbit_activity"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.PeerListActivity"
            android:label="@string/peer_list"
            android:theme="@style/Theme.BackOneConnect" />
        <activity
            android:name="cloud.backone.backoneconnect.ui.ScannerActivity"
            android:label="@string/qrscan"
            android:theme="@style/Theme.BackOneConnect" />
        <receiver
            android:name="cloud.backone.backoneconnect.service.StartupReceiver"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
    </application>
 </manifest>
@@ -0,0 +1,5 @@
 aarFormatVersion=1.0
 aarMetadataVersion=1.0
 minCompileSdk=1
 minCompileSdkExtension=0
 minAndroidGradlePluginVersion=1.0.0