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在我的 Django 项目中，我将不得不按照文档中的“动态”修改文件上传处理程序的元组，以便能够在上传文件流时对其进行修改。我需要这个“即时”，因为我必须从视图中向处理程序提供一些数据（参见setup()下面代码中的方法）。

如果您使用 CSRF 保护，该文档还提到了如何处理此问题。这很特别，因为 CSRF 保护中间件访问请求中的 POST 数据导致文件上传过程将在我的视图被调用之前触发。但是，这仅针对旧式视图进行了记录，但我想使用基于类的视图来完成相同的操作。

这是我的视图的最小代码示例：

from django.views.decorators.csrf import csrf_exempt, csrf_protect

class MyView(TemplateResponseMixin, ContextMixin, View):
    template_name = 'mytemplate.html'

    def __init__(self, *args, **kwargs):
        self.fileuploadhandler = MyUploadHandler()
        super(MyView, self).__init__(*args, **kwargs)

    def get(self, request, *args, **kwargs):
        return self.render_to_response(
            self.get_context_data(form=MyForm()))

    #@csrf_protect                               # this gives the error below
    def post(self, request, *args, **kwargs):
        # Set up the FileUploadHandler
        # SNIP - some data is being gathered here
        self.fileuploadhandler.setup(mydata)

        # Process the POST data by loading the ModelForm
        form = MyForm(request.POST, request.FILES)
        if form.is_valid():
            # SNIP processing Form
        else:
            return self.render_to_response(self.get_context_data(form=form))

    def get_context_data(self, **kwargs):
        context = super(MyView, self).get_context_data(**kwargs)
        return context

    @csrf_exempt                                 # I have to do this
    def dispatch(self, *args, **kwargs):
        self.request.upload_handlers.insert(0, self.fileuploadhandler)
        return super(MyView, self).dispatch(*args, **kwargs)

@csrf_protect我在该方法上使用时得到的错误post是：

Traceback (most recent call last):
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/utils/decorators.py", line 25, in _wrapper
    return bound_func(*args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 25, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/utils/decorators.py", line 21, in bound_func
    return func(self, *args2, **kwargs2)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/utils/decorators.py", line 25, in _wrapper
    return bound_func(*args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 25, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/utils/decorators.py", line 21, in bound_func
    return func(self, *args2, **kwargs2)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 77, in wrapped_view
    return view_func(*args, **kwargs)
  File "/some/path/to/project/myapp/views.py", line 01234, in dispatch
    return super(MyView, self).dispatch(*args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/views/generic/base.py", line 86, in dispatch
    return handler(request, *args, **kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/utils/decorators.py", line 87, in _wrapped_view
    result = middleware.process_view(request, view_func, args, kwargs)
  File "/some/path/to/Envs/someenv/local/lib/python2.7/site-packages/django/middleware/csrf.py", line 95, in process_view
    request.COOKIES[settings.CSRF_COOKIE_NAME])
AttributeError: 'MyView' object has no attribute 'COOKIES'

那么，我怎样才能拥有我的视图的以下三个属性的组合呢？

  • 基于类的视图的使用
  • “动态”修改文件上传处理程序的能力
  • 视图上的适当 CSRF 保护

使用的 Django 版本：1.5.1，Python 2.7.3。

4

1 回答 1

2

在一位同事的帮助下，我发现了一种使用 CSRF 中间件在视图中手动检查令牌的丑陋方式。这是食谱：

from django.views.decorators.csrf import csrf_exempt, csrf_protect
from django.middleware.csrf import CsrfViewMiddleware

class MyView(TemplateResponseMixin, ContextMixin, View):
    template_name = 'mytemplate.html'

    def __init__(self, *args, **kwargs):
        self.fileuploadhandler = MyUploadHandler()
        super(MyView, self).__init__(*args, **kwargs)

    def post(self, request, *args, **kwargs):
        # Set up the FileUploadHandler
        # SNIP - some data is being gathered here
        self.fileuploadhandler.setup(mydata)

        # Check CSRF manually *after* initializing the file upload handlers.
        csrf_checker = CsrfViewMiddleware()
        csrf_error = csrf_checker.process_view(request, None, None, None)
        if csrf_error is not None:
            return csrf_error # csrf_error is the regular CSRF error View

        # Process the POST data by loading the ModelForm
        form = MyForm(request.POST, request.FILES)
        if form.is_valid():
            # SNIP processing Form
        else:
            return self.render_to_response(self.get_context_data(form=form))

    @csrf_exempt # Important to skip CSRF checking here.
    def dispatch(self, *args, **kwargs):
        self.request.upload_handlers.insert(0, self.fileuploadhandler)
        return super(MyView, self).dispatch(*args, **kwargs)

我认为 Django 有一些改进的空间——在我看来，CSRF 中间件应该提供一个单独的check_token方法。process_view

于 2013-07-09T13:04:37.037 回答