Implemented settings, new scan, enhanced UI/UX

lib/feature/scan/service/scan_service.dart

@@ -0,0 +1,41 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:hl_lieferservice/dto/scan_response.dart';
+import 'package:http/http.dart' as http;
+import '../../../util.dart';
+import '../../authentication/exceptions.dart';
+
+class ScanService {
+  Future<void> scanArticle(String internalId) async {
+    try {
+      var response = await http.post(
+        urlBuilder("_web_scanArticle"),
+        headers: getSessionOrThrow(),
+        body: {"internal_id": internalId},
+      );
+
+      debugPrint(jsonEncode({"internal_id": internalId}));
+
+      if (response.statusCode == HttpStatus.unauthorized) {
+        throw UserUnauthorized();
+      }
+
+      Map<String, dynamic> responseJson = jsonDecode(response.body);
+      debugPrint(responseJson.toString());
+      ScanResponseDTO responseDto = ScanResponseDTO.fromJson(
+        responseJson,
+      );
+
+      if (responseDto.succeeded == true) {
+        return;
+      } else {
+        debugPrint("ERROR: ${responseDto.message}");
+        throw responseDto.message;
+      }
+    } catch (e) {
+      rethrow;
+    }
+  }
+}