Added Marianum Message pdf reader and backend

lib/api/mhsl/message/getMessages/getMessages.dart

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+import 'dart:convert';
+
+import 'package:http/http.dart' as http;
+import 'package:marianum_mobile/api/mhsl/message/getMessages/getMessagesResponse.dart';
+import 'package:marianum_mobile/api/mhsl/message/messageApi.dart';
+
+class GetMessages extends MessageApi<GetMessagesResponse> {
+
+  @override
+  GetMessagesResponse assemble(String raw) {
+    return GetMessagesResponse.fromJson(jsonDecode(raw));
+  }
+
+  @override
+  Future<http.Response> request(Uri uri) {
+    return http.get(uri);
+  }
+}

lib/api/mhsl/message/getMessages/getMessagesCache.dart

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+import 'dart:convert';
+
+import 'package:marianum_mobile/api/mhsl/message/getMessages/getMessagesResponse.dart';
+import 'package:marianum_mobile/api/requestCache.dart';
+
+import 'getMessages.dart';
+
+class GetMessagesCache extends RequestCache<GetMessagesResponse> {
+  GetMessagesCache({onUpdate, renew}) : super(RequestCache.cacheMinute, onUpdate, renew: renew) {
+    start("MarianumMobile", "message");
+  }
+
+  @override
+  GetMessagesResponse onLocalData(String json) {
+    return GetMessagesResponse.fromJson(jsonDecode(json));
+  }
+
+  @override
+  Future<GetMessagesResponse> onLoad() {
+    return GetMessages().run();
+  }
+}

lib/api/mhsl/message/getMessages/getMessagesResponse.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/apiResponse.dart';
+
+part 'getMessagesResponse.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class GetMessagesResponse extends ApiResponse {
+  String base;
+  Set<GetMessagesResponseObject> messages;
+
+  GetMessagesResponse(this.base, this.messages);
+
+  factory GetMessagesResponse.fromJson(Map<String, dynamic> json) => _$GetMessagesResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$GetMessagesResponseToJson(this);
+}
+
+@JsonSerializable(explicitToJson: true)
+class GetMessagesResponseObject {
+  String name;
+  String date;
+  String url;
+
+  GetMessagesResponseObject(this.name, this.date, this.url);
+
+  factory GetMessagesResponseObject.fromJson(Map<String, dynamic> json) => _$GetMessagesResponseObjectFromJson(json);
+  Map<String, dynamic> toJson() => _$GetMessagesResponseObjectToJson(this);
+}

lib/api/mhsl/message/getMessages/getMessagesResponse.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'getMessagesResponse.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+GetMessagesResponse _$GetMessagesResponseFromJson(Map<String, dynamic> json) =>
+    GetMessagesResponse(
+      json['base'] as String,
+      (json['messages'] as List<dynamic>)
+          .map((e) =>
+              GetMessagesResponseObject.fromJson(e as Map<String, dynamic>))
+          .toSet(),
+    );
+
+Map<String, dynamic> _$GetMessagesResponseToJson(
+        GetMessagesResponse instance) =>
+    <String, dynamic>{
+      'base': instance.base,
+      'messages': instance.messages.map((e) => e.toJson()).toList(),
+    };
+
+GetMessagesResponseObject _$GetMessagesResponseObjectFromJson(
+        Map<String, dynamic> json) =>
+    GetMessagesResponseObject(
+      json['name'] as String,
+      json['date'] as String,
+      json['url'] as String,
+    );
+
+Map<String, dynamic> _$GetMessagesResponseObjectToJson(
+        GetMessagesResponseObject instance) =>
+    <String, dynamic>{
+      'name': instance.name,
+      'date': instance.date,
+      'url': instance.url,
+    };