Support BLUETOOTH_CONNECT permission on Android 12 beta

mobile/src/main/AndroidManifest.xml

@@ -52,6 +52,8 @@
     <uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <!-- Required since API 29 -->
     <uses-permission-sdk-23 android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <!-- Required since API 31 -->
+    <uses-permission-sdk-23 android:name="android.permission.BLUETOOTH_CONNECT"/>
 
     <application
         android:name=".App"

mobile/src/main/java/be/mygod/vpnhotspot/manage/BluetoothTethering.kt

@@ -13,6 +13,7 @@ import be.mygod.vpnhotspot.App.Companion.app
 import be.mygod.vpnhotspot.net.TetheringManager
 import be.mygod.vpnhotspot.util.broadcastReceiver
 import be.mygod.vpnhotspot.util.readableMessage
+import be.mygod.vpnhotspot.widget.SmartSnackbar
 import timber.log.Timber
 import java.lang.reflect.InvocationTargetException
 
@@ -64,11 +65,15 @@ class BluetoothTethering(context: Context, val stateListener: () -> Unit) :
         fun start(callback: TetheringManager.StartTetheringCallback) {
             if (pendingCallback != null) return
             val adapter = BluetoothAdapter.getDefaultAdapter()
+            try {
                 if (adapter?.state == BluetoothAdapter.STATE_OFF) {
                     registerBluetoothStateListener(this)
                     pendingCallback = callback
                     adapter.enable()
                 } else TetheringManager.startTethering(TetheringManager.TETHERING_BLUETOOTH, true, callback)
+            } catch (e: SecurityException) {
+                SmartSnackbar.make(e.readableMessage).shortToast().show()
+            }
         }
     }
 
@@ -94,13 +99,16 @@ class BluetoothTethering(context: Context, val stateListener: () -> Unit) :
 
     private val receiver = broadcastReceiver { _, _ -> stateListener() }
 
-    init {
-        if (BluetoothAdapter.getDefaultAdapter() != null) try {
+    fun ensureInit(context: Context) {
+        if (pan == null && BluetoothAdapter.getDefaultAdapter() != null) try {
             pan = pan(context, this)
         } catch (e: InvocationTargetException) {
             Timber.w(e)
             activeFailureCause = e
         }
+    }
+    init {
+        ensureInit(context)
         registerBluetoothStateListener(receiver)
     }
 

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt

@@ -1,8 +1,11 @@
 package be.mygod.vpnhotspot.manage
 
+import android.Manifest
 import android.annotation.TargetApi
 import android.content.ClipData
+import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.net.MacAddress
 import android.os.Build
 import android.provider.Settings
@@ -10,11 +13,14 @@ import android.view.View
 import android.widget.Toast
 import androidx.annotation.RequiresApi
 import androidx.core.net.toUri
+import androidx.core.os.BuildCompat
 import androidx.core.view.updatePaddingRelative
+import androidx.fragment.app.Fragment
 import androidx.lifecycle.DefaultLifecycleObserver
 import androidx.lifecycle.LifecycleOwner
 import androidx.recyclerview.widget.RecyclerView
 import be.mygod.vpnhotspot.App.Companion.app
+import be.mygod.vpnhotspot.BuildConfig
 import be.mygod.vpnhotspot.MainActivity
 import be.mygod.vpnhotspot.R
 import be.mygod.vpnhotspot.databinding.ListitemInterfaceBinding
@@ -215,12 +221,26 @@ sealed class TetherManager(protected val parent: TetheringFragment) : Manager(),
     }
     @RequiresApi(24)
     class Bluetooth(parent: TetheringFragment) : TetherManager(parent), DefaultLifecycleObserver {
+        companion object {
+            // TODO: migrate to framework Manifest.permission when stable
+            private const val BLUETOOTH_CONNECT = "android.permission.BLUETOOTH_CONNECT"
+        }
+
         private val tethering = BluetoothTethering(parent.requireContext()) { data.notifyChange() }
 
         init {
             parent.viewLifecycleOwner.lifecycle.addObserver(this)
         }
 
+        fun ensureInit(context: Context) = tethering.ensureInit(context)
+        override fun onResume(owner: LifecycleOwner) {
+            if (!BuildCompat.isAtLeastS() || parent.requireContext().checkSelfPermission(BLUETOOTH_CONNECT) ==
+                PackageManager.PERMISSION_GRANTED) {
+                    ensureInit(parent.requireContext())
+            } else if (parent.shouldShowRequestPermissionRationale(BLUETOOTH_CONNECT)) {
+                parent.requestBluetooth.launch(BLUETOOTH_CONNECT)
+            }
+        }
         override fun onDestroy(owner: LifecycleOwner) = tethering.close()
 
         override val title get() = parent.getString(R.string.tethering_manage_bluetooth)

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt

@@ -46,11 +46,12 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
         internal val repeaterManager by lazy { RepeaterManager(this@TetheringFragment) }
         @get:RequiresApi(26)
         internal val localOnlyHotspotManager by lazy @TargetApi(26) { LocalOnlyHotspotManager(this@TetheringFragment) }
+        internal val bluetoothManager by lazy @TargetApi(24) { TetherManager.Bluetooth(this@TetheringFragment) }
         @get:RequiresApi(24)
         private val tetherManagers by lazy @TargetApi(24) {
             listOf(TetherManager.Wifi(this@TetheringFragment),
                     TetherManager.Usb(this@TetheringFragment),
-                    TetherManager.Bluetooth(this@TetheringFragment))
+                    bluetoothManager)
         }
         @get:RequiresApi(30)
         private val tetherManagers30 by lazy @TargetApi(30) {
@@ -130,6 +131,10 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
     val startLocalOnlyHotspot = registerForActivityResult(ActivityResultContracts.RequestPermission()) {
         adapter.localOnlyHotspotManager.start(requireContext())
     }
+    @RequiresApi(31)
+    val requestBluetooth = registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+        if (granted) adapter.bluetoothManager.ensureInit(requireContext())
+    }
 
     var ifaceLookup: Map<String, NetworkInterface> = emptyMap()
     var enabledTypes = emptySet<TetherType>()

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringTileService.kt

@@ -186,7 +186,11 @@ sealed class TetheringTileService : IpNeighbourMonitoringTileService(), Tetherin
                         state = Tile.STATE_INACTIVE
                         icon = tileOff
                     }
-                    null -> return
+                    null -> {
+                        state = Tile.STATE_UNAVAILABLE
+                        icon = tileOff
+                        subtitle(tethering?.activeFailureCause?.readableMessage)
+                    }
                 }
                 label = getText(labelString)
                 updateTile()