Start to integrate push notifications

lib/helpers/account_helper.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/helpers/api_helper.dart';
 import 'package:comunic/helpers/preferences_helper.dart';
+import 'package:comunic/helpers/push_notifications_helper.dart';
 import 'package:comunic/helpers/websocket_helper.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/authentication_details.dart';
@@ -77,6 +78,8 @@ class AccountHelper {
 
   /// Sign out user
   Future<void> signOut() async {
+    await PushNotificationsHelper.clearLocalStatus();
+
     await APIRequest.withLogin("account/logout").exec();
 
     final preferencesHelper = await PreferencesHelper.getInstance();

lib/helpers/preferences_helper.dart

@@ -13,6 +13,7 @@ enum PreferencesKeyList {
   ENABLE_DARK_THEME,
   FORCE_MOBILE_MODE,
   SHOW_PERFORMANCE_OVERLAY,
+  PUSH_NOTIFICATIONS_STATUS,
 }
 
 const _PreferenceKeysName = {
@@ -62,6 +63,10 @@ class PreferencesHelper {
     }
   }
 
+  bool containsKey(PreferencesKeyList key) {
+    return _sharedPreferences.containsKey(_PreferenceKeysName[key]);
+  }
+
   Future<bool> removeKey(PreferencesKeyList key) async {
     return await _sharedPreferences.remove(_PreferenceKeysName[key]);
   }

lib/helpers/push_notifications_helper.dart

@@ -0,0 +1,88 @@
+import 'package:comunic/helpers/preferences_helper.dart';
+import 'package:comunic/models/api_request.dart';
+
+/// Push notifications helper
+///
+/// @author Pierre Hubert
+
+enum PushNotificationsStatus { UNDEFINED, DISABLED, FIREBASE, INDEPENDENT }
+
+const _PushNotificationsAPIMap = {
+  "undefined": PushNotificationsStatus.UNDEFINED,
+  "disabled": PushNotificationsStatus.DISABLED,
+  "firebase": PushNotificationsStatus.FIREBASE,
+  "independent": PushNotificationsStatus.INDEPENDENT
+};
+
+class PushNotificationsHelper {
+  /// Get cached status of push notifications
+  static Future<PushNotificationsStatus> getLocalStatus() async {
+    final pref = await PreferencesHelper.getInstance();
+
+    if (!pref.containsKey(PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS))
+      return PushNotificationsStatus.UNDEFINED;
+
+    return _PushNotificationsAPIMap[
+        pref.getString(PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS)];
+  }
+
+  /// Refresh local status with information from server
+  ///
+  /// Throws in case of failure
+  static Future<void> refreshLocalStatus() async {
+    final pref = await PreferencesHelper.getInstance();
+
+    final response = await APIRequest.withLogin("push_notifications/status")
+        .execWithThrowGetObject();
+
+    switch (response["status"]) {
+      case "undefined":
+        await pref.removeKey(PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS);
+        break;
+
+      case "disabled":
+        await pref.setString(
+            PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS, "disabled");
+        break;
+
+      case "firebase":
+        await pref.setString(
+            PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS, "firebase");
+        break;
+
+      case "independent":
+        await pref.setString(
+            PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS, "independent");
+        // TODO : Invoke plugin to apply new WebSocket URL
+        break;
+
+      default:
+        print(
+            "Push notifications status ${response["status"]} is unknown, defaulting to disabled!");
+        await pref.setString(
+            PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS, "disabled");
+    }
+  }
+
+  /// Clear local push notifications status
+  static Future<void> clearLocalStatus() async {
+    await (await PreferencesHelper.getInstance())
+        .removeKey(PreferencesKeyList.PUSH_NOTIFICATIONS_STATUS);
+
+    // TODO : stop local refresh notification refresh
+  }
+
+  /// Set new push notification status on the server
+  static Future<void> setNewStatus(
+    PushNotificationsStatus newStatus, {
+    String firebaseToken = "",
+  }) async =>
+      await APIRequest.withLogin("push_notifications/configure")
+          .addString(
+              "status",
+              _PushNotificationsAPIMap.entries
+                  .firstWhere((e) => e.value == newStatus)
+                  .key)
+          .addString("firebase_token", firebaseToken)
+          .execWithThrow();
+}

lib/helpers/server_config_helper.dart

@@ -17,6 +17,7 @@ class ServerConfigurationHelper {
         (await APIRequest.withoutLogin("server/config").execWithThrow())
             .getObject();
 
+    final pushNotificationsPolicy = response["push_notifications"];
     final passwordPolicy = response["password_policy"];
     final dataConservationPolicy = response["data_conservation_policy"];
     final conversationsPolicy = response["conversations_policy"];
@@ -27,6 +28,10 @@ class ServerConfigurationHelper {
         termsURL: response["terms_url"],
         playStoreURL: response["play_store_url"],
         androidDirectDownloadURL: response["android_direct_download_url"],
+        notificationsPolicy: NotificationsPolicy(
+          hasFirebase: pushNotificationsPolicy["has_firebase"],
+          hasIndependent: pushNotificationsPolicy["has_independent"],
+        ),
         passwordPolicy: PasswordPolicy(
           allowMailInPassword: passwordPolicy["allow_email_in_password"],
           allowNameInPassword: passwordPolicy["allow_name_in_password"],