Question

我计划使用django-piston制作通用CRUD。我的示例代码之一有以下

class TaskHandler(BaseHandler):
allowed_methods = ('GET','POST',)
model = Task

def read(self, name=None):
    return self.model.objects.all()

def create(self, request, *args, **kwargs):
    if not self.has_model():
        return rc.NOT_IMPLEMENTED

    attrs = self.flatten_dict(request.POST)
    if attrs.has_key('data'):
        #  rest.POST.get('data') has csrfmiddlewaretoken as a hiddenfield
        #  i need to exclude it from post as my ORM is giving error message
        ext_posted_data = simplejson.loads(request.POST.get('data'))
        attrs = self.flatten_dict(ext_posted_data)

    try:
        inst = self.model.objects.get(**attrs)
        return rc.DUPLICATE_ENTRY
    except self.model.DoesNotExist:
        inst = self.model(**attrs)
        inst.save()
        return inst
    except self.model.MultipleObjectsReturned:
        return rc.DUPLICATE_ENTRY

下面是错误日志

Piston/0.2.2 (Django 1.4) crash report:
  Traceback (most recent call last): 
   File "C:\Python27\Lib\site-packages\django\bin\sumit\sumit\handler.py", line 27,
      in create inst = self.model.objects.get(**attrs) 
   File "C:\Python27\lib\site-packages\django\db\models\manager.py", line 131, 
      in get return self.get_query_set().get(*args, **kwargs)
   File "C:\Python27\lib\site-packages\django\db\models\query.py", line 358,
      in get clone = self.filter(*args, **kwargs) 
   File "C:\Python27\lib\site-packages\django\db\models\query.py", line 621,
      in filter return self._filter_or_exclude(False, *args, **kwargs)
   File "C:\Python27\lib\site-packages\django\db\models\query.py", line 639,
      in _filter_or_exclude clone.query.add_q(Q(*args, **kwargs))
   File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line 1250,
      in add_q can_reuse=used_aliases, force_having=force_having)
   File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line 1122,
      in add_filter process_extras=process_extras)
   File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line 1316,
      in setup_joins "Choices are: %s" % (name, ", ".join(names))) 

    FieldError: **Cannot resolve keyword 'csrfmiddlewaretoken' into field.
      Choices are:  complete, id, name**

Answer 1

简而言之：不要那样做。

任何用户都可以发送他们想要的任何POST参数。您无法保证即使您的表单不包含任何随机POST参数，也不会添加任何随机POST参数。

不要尝试从参数中过滤csrfmiddlewaretoken，而是尝试将要包含的内容列入白名单。这意味着，只需选择与您的模型字段和对应的那些，您希望用户能够对其进行过滤。

<强>更新
好吧，那么，如何过滤掉它，只是为了满足你的好奇心。 flatten_dict会返回一个常规的Python字典，这意味着您只需del attrs['csrfmiddlewaretoken']即可将其从字典中删除。

更新（2）：
要列入白名单，以下内容应该有效：

allowed_keys = ['complete', 'id', 'name']
attrs = dict((key, value) for key, value in ext_posted_data if key in allowed_keys)

发布-django时过滤csrfmiddlewaretoken

1 个答案: