implement permission check for notifications on Android 13

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/conversationlist/ConversationsListActivity.kt

@@ -27,6 +27,7 @@
  */
 package com.nextcloud.talk.conversationlist
 
+import android.Manifest
 import android.animation.AnimatorInflater
 import android.annotation.SuppressLint
 import android.app.SearchManager
@@ -217,6 +218,19 @@ class ConversationsListActivity :
         onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
     }
 
+    override fun onPostCreate(savedInstanceState: Bundle?) {
+        super.onPostCreate(savedInstanceState);
+
+        // handle notification permission on API level >= 33
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU
+            && !platformPermissionUtil.isPostNotificationsPermissionGranted()) {
+            requestPermissions(
+                arrayOf(Manifest.permission.POST_NOTIFICATIONS),
+                REQUEST_POST_NOTIFICATIONS_PERMISSION
+            )
+        }
+    }
+
     override fun onResume() {
         super.onResume()
 
@@ -1506,5 +1520,6 @@ class ConversationsListActivity :
         const val CLIENT_UPGRADE_GPLAY_LINK = "https://play.google.com/store/apps/details?id="
         const val HTTP_SERVICE_UNAVAILABLE = 503
         const val MAINTENANCE_MODE_HEADER_KEY = "X-Nextcloud-Maintenance-Mode"
+        const val REQUEST_POST_NOTIFICATIONS_PERMISSION = 111
     }
 }

app/src/main/java/com/nextcloud/talk/utils/permissions/PlatformPermissionUtil.kt

@@ -27,4 +27,5 @@ interface PlatformPermissionUtil {
     fun isMicrophonePermissionGranted(): Boolean
     fun isBluetoothPermissionGranted(): Boolean
     fun isFilesPermissionGranted(): Boolean
+    fun isPostNotificationsPermissionGranted(): Boolean
 }

app/src/main/java/com/nextcloud/talk/utils/permissions/PlatformPermissionUtilImpl.kt

@@ -102,6 +102,13 @@ class PlatformPermissionUtilImpl(private val context: Context) : PlatformPermiss
         }
     }
 
+    override fun isPostNotificationsPermissionGranted(): Boolean {
+        return PermissionChecker.checkSelfPermission(
+            context,
+            Manifest.permission.POST_NOTIFICATIONS
+        ) == PermissionChecker.PERMISSION_GRANTED
+    }
+
     companion object {
         private val TAG = PlatformPermissionUtilImpl::class.simpleName
     }