TF-2877 Create notification data source & repo

android/app/src/main/kotlin/com/linagora/android/tmail/MainActivity.kt

@@ -1,11 +1,17 @@
 package com.linagora.android.tmail
 
+import android.app.NotificationManager
+import android.content.Context
 import android.os.Bundle
 import android.os.PersistableBundle
 import io.flutter.embedding.android.FlutterFragmentActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugins.GeneratedPluginRegistrant
 import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
+import android.os.Build
+import android.text.TextUtils
+import androidx.core.app.NotificationManagerCompat
+import io.flutter.plugin.common.MethodChannel
 
 class MainActivity: FlutterFragmentActivity() {
 
@@ -20,5 +26,7 @@ class MainActivity: FlutterFragmentActivity() {
 
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         GeneratedPluginRegistrant.registerWith(flutterEngine)
+
+        NotificationGroup().register(flutterEngine, applicationContext)
     }
 }

android/app/src/main/kotlin/com/linagora/android/tmail/NotificationGroup.kt

@@ -0,0 +1,48 @@
+package com.linagora.android.tmail
+
+import android.app.NotificationManager
+import android.content.Context
+import android.os.Build
+import android.text.TextUtils
+import androidx.core.app.NotificationManagerCompat
+import io.flutter.embedding.android.FlutterFragmentActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+
+class NotificationGroup {
+    private val channel = "com.linagora.android.teammail.notification.group.permission"
+
+    fun register(flutterEngine: FlutterEngine, applicationContext: Context) {
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, channel).setMethodCallHandler { call, result ->
+            try {
+                if (call.method == "getNotificationGroupPermission") {
+                    val groupId = call.arguments
+                    if (groupId is String) {
+                        val isEnabled = getNotificationChannelGroupStatus(applicationContext, groupId)
+                        result.success(isEnabled)
+                    } else {
+                        result.error("Unavailable", "No such group", "")
+                    }
+                } else {
+                    result.notImplemented()
+                }
+            } catch (exception: Throwable) {
+                result.error("UnknownError", exception.message, "")
+            }
+        }
+    }
+
+    private fun getNotificationChannelGroupStatus(context: Context, groupId: String?): Boolean {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            if (!TextUtils.isEmpty(groupId)) {
+                val manager = context.getSystemService(FlutterFragmentActivity.NOTIFICATION_SERVICE) as NotificationManager
+                val group = manager.getNotificationChannelGroup(groupId)
+                return !group.isBlocked
+            }
+
+            return false
+        } else {
+            NotificationManagerCompat.from(context).areNotificationsEnabled()
+        }
+    }
+}