Add compatibility with http-errors to jsonapi_exception_formatter (#2)

* Add compatibility with http-errors to jsonapi_exception_formatter and add unauthorized exception

flask_rest_jsonapi/decorators.py

@@ -5,7 +5,7 @@
 
 from flask import request, make_response, jsonify, current_app
 
-from flask_rest_jsonapi.errors import jsonapi_errors
+from flask_rest_jsonapi.errors import jsonapi_errors, format_http_exception
 from flask_rest_jsonapi.exceptions import JsonApiException
 from flask_rest_jsonapi.utils import JSONEncoder
 
@@ -77,6 +77,12 @@ def wrapper(*args, **kwargs):
                                  e.status,
                                  headers)
         except Exception as e:
+            api_ex = format_http_exception(e)
+            if api_ex:
+                return make_response(jsonify(jsonapi_errors([api_ex.to_dict()])),
+                                     api_ex.status,
+                                     headers)
+
             if current_app.config['DEBUG'] is True:
                 raise e
 

flask_rest_jsonapi/errors.py

@@ -1,4 +1,13 @@
 """Helper to  format Api errors according to jsonapi specification"""
+from flask_rest_jsonapi.exceptions import BadRequest, ObjectNotFound, InvalidType, AccessDenied, Unauthorized
+
+STATUS_MAP = {
+    400: BadRequest,
+    401: Unauthorized,
+    404: ObjectNotFound,
+    409: InvalidType,
+    403: AccessDenied,
+}
 
 
 def jsonapi_errors(jsonapi_errors):
@@ -9,3 +18,23 @@ def jsonapi_errors(jsonapi_errors):
     """
     return {'errors': [jsonapi_error for jsonapi_error in jsonapi_errors],
             'jsonapi': {'version': '1.0'}}
+
+
+def format_http_exception(ex):
+    """
+    try to format http exception to jsonapi 1.0
+    Warning! It only works for errors with status code less than 500
+    :param ex: http exception
+    :return:
+    """
+    code = getattr(ex, 'code', None)
+    try:
+        status = int(code)
+    except TypeError:
+        return
+
+    api_ex = STATUS_MAP.get(status)
+    if not api_ex:
+        return
+
+    return api_ex(detail=getattr(ex, 'description', ''))

flask_rest_jsonapi/exceptions.py

@@ -98,6 +98,13 @@ class InvalidType(JsonApiException):
     status = '409'
 
 
+class Unauthorized(JsonApiException):
+    """Throw this error if the user is not authorized"""
+
+    title = 'Unauthorized'
+    status = '401'
+
+
 class AccessDenied(JsonApiException):
     """Throw this error when requested resource owner doesn't match the user of the ticket"""