Added Nextcloud base

lib/api/marianumcloud/talk/chat/getChatCache.dart

@@ -0,0 +1,30 @@
+import 'dart:convert';
+
+import 'package:marianum_mobile/api/marianumcloud/talk/chat/getChat.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/chat/getChatParams.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/chat/getChatResponse.dart';
+import 'package:marianum_mobile/api/requestCache.dart';
+
+class GetChatCache extends RequestCache<GetChatResponse> {
+  String chatToken;
+
+  GetChatCache({required onUpdate, required this.chatToken}) : super(RequestCache.cacheNothing, onUpdate) {
+    start("MarianumMobile", "nc-chat-$chatToken");
+  }
+
+  @override
+  Future<GetChatResponse> onLoad() {
+    return GetChat(
+      chatToken,
+      GetChatParams(
+        lookIntoFuture: GetChatParamsSwitch.off
+      )
+    ).run();
+  }
+
+  @override
+  GetChatResponse onLocalData(String json) {
+    return GetChatResponse.fromJson(jsonDecode(json));
+  }
+
+}