feat(android): connect from quick settings tile (#20)

Author: AmirrezaFarnamTaheri

android/app/src/main/java/com/masterdns/vpn/service/VpnTileService.kt

@@ -1,15 +1,26 @@
 package com.masterdns.vpn.service
 
+import android.content.Intent
+import android.net.VpnService
 import android.os.Build
 import android.service.quicksettings.Tile
 import android.service.quicksettings.TileService
 import androidx.annotation.RequiresApi
+import com.masterdns.vpn.MainActivity
 import com.masterdns.vpn.R
+import com.masterdns.vpn.data.local.AppDatabase
 import com.masterdns.vpn.util.VpnManager
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.launch
 
 @RequiresApi(Build.VERSION_CODES.N)
 class VpnTileService : TileService() {
 
+    private val tileScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
+
     override fun onStartListening() {
         super.onStartListening()
         updateTile()
@@ -18,15 +29,48 @@ class VpnTileService : TileService() {
     override fun onClick() {
         super.onClick()
         val state = VpnManager.state.value
-        if (state == VpnManager.VpnState.CONNECTED) {
-            VpnManager.disconnect(this)
-        } else if (state == VpnManager.VpnState.DISCONNECTED) {
-            // Can't start VPN from tile without VPN permission
-            // Just update the tile state
+        when (state) {
+            VpnManager.VpnState.CONNECTED -> VpnManager.disconnect(this)
+            VpnManager.VpnState.DISCONNECTED -> connectFromTileIfReady()
+            else -> Unit
         }
         updateTile()
     }
 
+    override fun onDestroy() {
+        tileScope.cancel()
+        super.onDestroy()
+    }
+
+    private fun connectFromTileIfReady() {
+        val prepareIntent = VpnService.prepare(this)
+        if (prepareIntent != null) {
+            startActivityAndCollapse(prepareIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+            return
+        }
+
+        tileScope.launch(Dispatchers.IO) {
+            val selectedProfile = AppDatabase.getInstance(this@VpnTileService)
+                .profileDao()
+                .getSelectedProfile()
+
+            launch(Dispatchers.Main) {
+                if (selectedProfile != null) {
+                    VpnManager.connect(this@VpnTileService, selectedProfile)
+                    updateTile()
+                } else {
+                    openApp()
+                }
+            }
+        }
+    }
+
+    private fun openApp() {
+        val intent = Intent(this, MainActivity::class.java)
+            .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        startActivityAndCollapse(intent)
+    }
+
     private fun updateTile() {
         val tile = qsTile ?: return
         when (VpnManager.state.value) {