Implement local HTTP Api usage

lib/api/webuntis/queries/authenticate/authenticate.dart

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+import 'dart:async';
+import 'dart:convert';
+import 'dart:developer';
+
+import 'package:marianum_mobile/api/webuntis/webuntisApi.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'authenticateParams.dart';
+import 'authenticateResponse.dart';
+
+class Authenticate extends WebuntisApi {
+  AuthenticateParams param;
+
+  Authenticate(this.param) : super("authenticate", param, authenticatedResponse: false);
+
+  @override
+  Future<AuthenticateResponse> run() async {
+    awaitingResponse = true;
+    String rawAnswer = await query(this);
+    AuthenticateResponse response = finalize(AuthenticateResponse.fromJson(jsonDecode(rawAnswer)['result']));
+    _lastResponse = response;
+    awaitedResponse.complete();
+    return response;
+  }
+
+  static bool awaitingResponse = false;
+  static Completer awaitedResponse = Completer();
+  static AuthenticateResponse? _lastResponse;
+
+  static Future<void> createSession() async {
+    SharedPreferences preferences = await SharedPreferences.getInstance();
+
+    _lastResponse = await Authenticate(
+        AuthenticateParams(
+          user: preferences.getString("username")!,
+          password: preferences.getString("password")!,
+        )
+    ).run();
+  }
+
+  static Future<AuthenticateResponse> getSession() async {
+    if(awaitingResponse) {
+      log("Other query in progress... waiting");
+      await awaitedResponse.future;
+    }
+
+    if(_lastResponse == null) {
+      log("Not authenticated... requesting");
+      awaitingResponse = true;
+      await createSession();
+    }
+    return _lastResponse!;
+
+  }
+}

lib/api/webuntis/queries/authenticate/authenticateParams.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/webuntis/apiParams.dart';
+
+part 'authenticateParams.g.dart';
+
+@JsonSerializable()
+class AuthenticateParams extends ApiParams {
+
+  String user;
+  String password;
+
+  AuthenticateParams({required this.user, required this.password});
+  factory AuthenticateParams.fromJson(Map<String, dynamic> json) => _$AuthenticateParamsFromJson(json);
+
+  Map<String, dynamic> toJson() => _$AuthenticateParamsToJson(this);
+}

lib/api/webuntis/queries/authenticate/authenticateParams.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'authenticateParams.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+AuthenticateParams _$AuthenticateParamsFromJson(Map<String, dynamic> json) =>
+    AuthenticateParams(
+      user: json['user'] as String,
+      password: json['password'] as String,
+    );
+
+Map<String, dynamic> _$AuthenticateParamsToJson(AuthenticateParams instance) =>
+    <String, dynamic>{
+      'user': instance.user,
+      'password': instance.password,
+    };

lib/api/webuntis/queries/authenticate/authenticateResponse.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/webuntis/apiResponse.dart';
+
+part 'authenticateResponse.g.dart';
+
+@JsonSerializable()
+class AuthenticateResponse extends ApiResponse {
+
+  String sessionId;
+  int personType;
+  int personId;
+  int klasseId;
+
+  AuthenticateResponse(this.sessionId, this.personType, this.personId, this.klasseId);
+
+  factory AuthenticateResponse.fromJson(Map<String, dynamic> json) => _$AuthenticateResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$AuthenticateResponseToJson(this);
+}

lib/api/webuntis/queries/authenticate/authenticateResponse.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'authenticateResponse.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+AuthenticateResponse _$AuthenticateResponseFromJson(
+        Map<String, dynamic> json) =>
+    AuthenticateResponse(
+      json['sessionId'] as String,
+      json['personType'] as int,
+      json['personId'] as int,
+      json['klasseId'] as int,
+    );
+
+Map<String, dynamic> _$AuthenticateResponseToJson(
+        AuthenticateResponse instance) =>
+    <String, dynamic>{
+      'sessionId': instance.sessionId,
+      'personType': instance.personType,
+      'personId': instance.personId,
+      'klasseId': instance.klasseId,
+    };