WIP - Provider refactorings

lib/core/interceptor/authentication.interceptor.dart

@@ -2,27 +2,25 @@ import 'dart:developer';
 
 import 'package:flutter/foundation.dart';
 import 'package:http_interceptor/http_interceptor.dart';
-import 'package:paperless_mobile/core/store/local_vault.dart';
 
 class AuthenticationInterceptor implements InterceptorContract {
-  final LocalVault _localVault;
-  AuthenticationInterceptor(this._localVault);
+  String? serverUrl;
+  String? token;
+  AuthenticationInterceptor({this.serverUrl, this.token});
 
   @override
   Future<BaseRequest> interceptRequest({required BaseRequest request}) async {
-    final auth = await _localVault.loadAuthenticationInformation();
-
     if (kDebugMode) {
       log("Intercepted ${request.method} request to ${request.url.toString()}");
     }
 
     return request.copyWith(
-      //Append server Url
-      headers: auth?.token?.isEmpty ?? true
+      url: Uri.parse((serverUrl ?? '') + request.url.toString()),
+      headers: token?.isEmpty ?? true
           ? request.headers
           : {
               ...request.headers,
-              'Authorization': 'Token ${auth!.token}',
+              'Authorization': 'Token $token',
             },
     );
   }

lib/core/interceptor/dio_http_error_interceptor.dart

@@ -0,0 +1,38 @@
+import 'dart:convert';
+
+import 'package:dio/dio.dart';
+import 'package:paperless_mobile/core/type/types.dart';
+
+class DioHttpErrorInterceptor implements InterceptorsWrapper {
+  @override
+  void onError(DioError e, ErrorInterceptorHandler handler) {
+    //TODO: Implement and debug how error handling works, or if request has to be resolved.
+    if (e.response?.statusCode == 400) {
+      // try to parse contained error message, otherwise return response
+      final Map<String, dynamic> json = jsonDecode(e.response?.data);
+      final PaperlessValidationErrors errorMessages = {};
+      for (final entry in json.entries) {
+        if (entry.value is List) {
+          errorMessages.putIfAbsent(
+              entry.key, () => (entry.value as List).cast<String>().first);
+        } else if (entry.value is String) {
+          errorMessages.putIfAbsent(entry.key, () => entry.value);
+        } else {
+          errorMessages.putIfAbsent(entry.key, () => entry.value.toString());
+        }
+      }
+      throw errorMessages;
+    }
+    handler.next(e);
+  }
+
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    handler.next(options);
+  }
+
+  @override
+  void onResponse(Response response, ResponseInterceptorHandler handler) {
+    handler.next(response);
+  }
+}