Added HasPermission

Author: zengqiu

README.md

@@ -54,6 +54,17 @@ Usage:
 from djangorestframework_ext.permissions import IsSuperuser
 ```
 
+## HasPermission
+
+Mainly used for providing permission validation to `@api_view`.
+
+```
+@api_view(['GET'])
+@permission_classes([HasPermission('user.change_user')])
+def change_user(request):
+    ...
+```
+
 # Serializers
 
 ## RecursiveSerializer

rest_framework_ext/permissions.py

@@ -11,6 +11,20 @@ def has_permission(self, request, view):
         return bool(request.user and request.user.is_superuser)
 
 
+class HasPermission(BasePermission):
+    permission_codename = ''
+
+    def __init__(self, permission_codename):
+        super().__init__()
+        self.permission_codename = permission_codename
+
+    def __call__(self):
+        return self
+
+    def has_permission(self, request, view):
+        return request.user.has_perm(self.permission_codename)
+
+
 class ExportPermission(BasePermission):
     def has_permission(self, request, view):
         if view.action == 'export':