Implement local HTTP Api usage

lib/api/webuntis/webuntisApi.dart

@@ -0,0 +1,54 @@
+import 'dart:convert';
+import 'dart:developer';
+import 'package:marianum_mobile/api/apiRequest.dart';
+import 'package:http/http.dart' as http;
+import 'package:marianum_mobile/api/webuntis/webuntisError.dart';
+import 'package:marianum_mobile/api/webuntis/apiResponse.dart';
+
+import 'apiParams.dart';
+import 'queries/authenticate/authenticate.dart';
+
+abstract class WebuntisApi extends ApiRequest {
+  String method;
+  ApiParams? genericParam;
+  http.Response? response;
+
+  bool authenticatedResponse;
+
+  WebuntisApi(this.method, this.genericParam, {this.authenticatedResponse = true}) : super(Uri.parse("https://peleus.webuntis.com/WebUntis/jsonrpc.do?school=marianum-fulda"));
+
+
+  Future<String> query(WebuntisApi untis) async {
+    String query = '{"id":"ID","method":"$method","params":${untis._body()},"jsonrpc":"2.0"}';
+    log(query);
+
+    String sessionId = "0";
+    if(authenticatedResponse) {
+      sessionId = (await Authenticate.getSession()).sessionId;
+    }
+    http.Response data = await post(query, {"Cookie": "JSESSIONID=$sessionId"});
+    response = data;
+
+    dynamic jsonData = jsonDecode(data.body);
+    if(jsonData['error'] != null) {
+      if(jsonData['error']['code'] == -8520) {
+        await Authenticate.createSession();
+        this.query(untis);
+      } else {
+        throw WebuntisError(jsonData['error']['message'], jsonData['error']['code']);
+      }
+    }
+    return data.body;
+  }
+
+  dynamic finalize(dynamic response) {
+    response.rawResponse = this.response!;
+    return response;
+  }
+
+  Future<ApiResponse> run();
+
+  String _body() {
+    return genericParam == null ? "{}" : jsonEncode(genericParam);
+  }
+}