fix: keep calls alive in background on iOS and Android

src-tauri/Cargo.toml

@@ -127,7 +127,13 @@ tauri-plugin-sharekit = { git = "https://github.com/Choochmeque/tauri-plugin-sha
 
 [target.'cfg(target_os = "ios")'.dependencies]
 objc2 = "0.6"
-objc2-foundation = { version = "0.3", features = ["NSError", "NSFileManager", "NSString", "NSURL"] }
+objc2-foundation = { version = "0.3", features = [
+  "NSError",
+  "NSFileManager",
+  "NSString",
+  "NSURL",
+  "NSUUID",
+] }
 objc2-photos = { version = "0.3.2", default-features = false, features = [
   "std",
   "PHPhotoLibrary",
@@ -145,6 +151,24 @@ objc2-avf-audio = { version = "0.3", default-features = false, features = [
   "AVAudioSession",
   "AVAudioSessionTypes",
 ] }
+objc2-call-kit = { version = "0.3", default-features = false, features = [
+  "std",
+  "alloc",
+  "block2",
+  "dispatch2",
+  "CXAction",
+  "CXProvider",
+  "CXProviderConfiguration",
+  "CXCallUpdate",
+  "CXHandle",
+  "CXCall",
+  "CXCallAction",
+  "CXStartCallAction",
+  "CXEndCallAction",
+  "CXSetMutedCallAction",
+  "CXTransaction",
+  "CXCallController",
+] }
 
 [target.'cfg(target_os = "android")'.dependencies]
 tauri-plugin-android-fs = { version = "=28.4.0", features = ["legacy-storage-permission"] }

src-tauri/gen/android/app/src/main/AndroidManifest.xml

@@ -17,6 +17,8 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
+    <!-- Keep the CPU awake so the WebView's WebRTC keeps running while backgrounded -->
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
 
     <uses-feature android:name="android.hardware.camera" android:required="false" />
     <uses-feature android:name="android.hardware.microphone" android:required="false" />

src-tauri/gen/android/app/src/main/java/moe/sable/client/CallForegroundService.kt

@@ -6,13 +6,20 @@ import android.app.NotificationManager
 import android.app.Service
 import android.content.pm.PackageManager
 import android.content.pm.ServiceInfo
+import android.media.AudioAttributes
+import android.media.AudioFocusRequest
+import android.media.AudioManager
 import android.os.Build
 import android.os.IBinder
+import android.os.PowerManager
 import android.util.Log
 import androidx.core.app.NotificationCompat
 import androidx.core.app.ServiceCompat
 
 class CallForegroundService : Service() {
+  private var wakeLock: PowerManager.WakeLock? = null
+  private var audioFocusRequest: AudioFocusRequest? = null
+
   override fun onBind(intent: android.content.Intent?): IBinder? = null
 
   override fun onStartCommand(intent: android.content.Intent?, flags: Int, startId: Int): Int {
@@ -47,14 +54,52 @@ class CallForegroundService : Service() {
       return START_NOT_STICKY
     }
 
+    acquireWakeLock()
+    requestAudioFocus()
+
     return START_NOT_STICKY
   }
 
   override fun onDestroy() {
+    releaseAudioFocus()
+    releaseWakeLock()
     stopForeground(STOP_FOREGROUND_REMOVE)
     super.onDestroy()
   }
 
+  private fun acquireWakeLock() {
+    if (wakeLock?.isHeld == true) return
+    val pm = getSystemService(POWER_SERVICE) as PowerManager
+    wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Sable:CallForeground")
+    wakeLock?.acquire(WAKE_LOCK_TIMEOUT_MS)
+  }
+
+  private fun releaseWakeLock() {
+    wakeLock?.let { if (it.isHeld) it.release() }
+    wakeLock = null
+  }
+
+  private fun requestAudioFocus() {
+    val am = getSystemService(AUDIO_SERVICE) as AudioManager
+    val attributes = AudioAttributes.Builder()
+      .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
+      .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
+      .build()
+    audioFocusRequest = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
+      .setAudioAttributes(attributes)
+      .setOnAudioFocusChangeListener { _ -> }
+      .build()
+    am.requestAudioFocus(audioFocusRequest!!)
+  }
+
+  private fun releaseAudioFocus() {
+    audioFocusRequest?.let {
+      val am = getSystemService(AUDIO_SERVICE) as AudioManager
+      am.abandonAudioFocusRequest(it)
+    }
+    audioFocusRequest = null
+  }
+
   private fun createNotificationChannel() {
     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) return
 
@@ -70,5 +115,6 @@ class CallForegroundService : Service() {
     const val CHANNEL_ID = "call_foreground"
     const val NOTIFICATION_ID = 1395
     const val TAG = "CallForegroundService"
+    const val WAKE_LOCK_TIMEOUT_MS = 60L * 60L * 1000L
   }
 }

src-tauri/ios-project.yml

@@ -92,7 +92,7 @@ targets:
       properties:
         LSRequiresIPhoneOS: true
         UILaunchStoryboardName: LaunchScreen
-        UIBackgroundModes: [audio]
+        UIBackgroundModes: [audio, voip]
         NSMicrophoneUsageDescription: Sable uses your microphone for calls.
         NSCameraUsageDescription: Sable uses your camera for video calls.
         UIRequiredDeviceCapabilities: [arm64, metal]
@@ -107,7 +107,7 @@ targets:
           - UIInterfaceOrientationLandscapeRight
         CFBundleShortVersionString: {{apple.bundle-version-short}}
         CFBundleVersion: "{{apple.bundle-version}}"
-        UIBackgroundModes: [audio]
+        UIBackgroundModes: [audio, voip]
         NSPhotoLibraryAddUsageDescription: Sable saves images you download to your photo library.
         # Mirrors plugins.deep-link in tauri.conf.json: the plugin only patches
         # these in when cargo reruns its build script, so a fresh `tauri ios
@@ -159,7 +159,9 @@ targets:
       - sdk: MetalKit.framework
       - sdk: QuartzCore.framework
       - sdk: Security.framework
-      - sdk: UIKit.framework{{#if this.ios-frameworks}}{{~#each ios-frameworks}}
+      - sdk: UIKit.framework
+      - sdk: CallKit.framework
+      - sdk: AVFoundation.framework{{#if this.ios-frameworks}}{{~#each ios-frameworks}}
       - sdk: {{this}}.framework{{/each}}{{/if}}
       - sdk: WebKit.framework
     preBuildScripts: