feat(web,server): link/unlink oauth account (#1154)

* feat(web,server): link/unlink oauth account

* chore: linting

* fix: broken oauth callback

* fix: user core bugs

* fix: tests

* fix: use user response

* chore: update docs

* feat: prevent the same oauth account from being linked twice

* chore: mock logger

mobile/openapi/lib/api/o_auth_api.dart

@@ -109,4 +109,92 @@ class OAuthApi {
     }
     return null;
   }
+
+  /// Performs an HTTP 'POST /oauth/link' operation and returns the [Response].
+  /// Parameters:
+  ///
+  /// * [OAuthCallbackDto] oAuthCallbackDto (required):
+  Future<Response> linkWithHttpInfo(OAuthCallbackDto oAuthCallbackDto,) async {
+    // ignore: prefer_const_declarations
+    final path = r'/oauth/link';
+
+    // ignore: prefer_final_locals
+    Object? postBody = oAuthCallbackDto;
+
+    final queryParams = <QueryParam>[];
+    final headerParams = <String, String>{};
+    final formParams = <String, String>{};
+
+    const contentTypes = <String>['application/json'];
+
+
+    return apiClient.invokeAPI(
+      path,
+      'POST',
+      queryParams,
+      postBody,
+      headerParams,
+      formParams,
+      contentTypes.isEmpty ? null : contentTypes.first,
+    );
+  }
+
+  /// Parameters:
+  ///
+  /// * [OAuthCallbackDto] oAuthCallbackDto (required):
+  Future<UserResponseDto?> link(OAuthCallbackDto oAuthCallbackDto,) async {
+    final response = await linkWithHttpInfo(oAuthCallbackDto,);
+    if (response.statusCode >= HttpStatus.badRequest) {
+      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
+    }
+    // When a remote server returns no body with a status of 204, we shall not decode it.
+    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
+    // FormatException when trying to decode an empty string.
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
+      return await apiClient.deserializeAsync(await _decodeBodyBytes(response), 'UserResponseDto',) as UserResponseDto;
+    
+    }
+    return null;
+  }
+
+  /// Performs an HTTP 'POST /oauth/unlink' operation and returns the [Response].
+  Future<Response> unlinkWithHttpInfo() async {
+    // ignore: prefer_const_declarations
+    final path = r'/oauth/unlink';
+
+    // ignore: prefer_final_locals
+    Object? postBody;
+
+    final queryParams = <QueryParam>[];
+    final headerParams = <String, String>{};
+    final formParams = <String, String>{};
+
+    const contentTypes = <String>[];
+
+
+    return apiClient.invokeAPI(
+      path,
+      'POST',
+      queryParams,
+      postBody,
+      headerParams,
+      formParams,
+      contentTypes.isEmpty ? null : contentTypes.first,
+    );
+  }
+
+  Future<UserResponseDto?> unlink() async {
+    final response = await unlinkWithHttpInfo();
+    if (response.statusCode >= HttpStatus.badRequest) {
+      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
+    }
+    // When a remote server returns no body with a status of 204, we shall not decode it.
+    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
+    // FormatException when trying to decode an empty string.
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
+      return await apiClient.deserializeAsync(await _decodeBodyBytes(response), 'UserResponseDto',) as UserResponseDto;
+    
+    }
+    return null;
+  }
 }