如何在 Django 通用视图中安装自定义上传处理程序？

Question

为了提供文件上传的进度反馈，我需要为特定视图安装自定义上传处理程序。这是关于“经典”Django 视图的文档，位于

https://docs.djangoproject.com/en/dev/topics/http/file-uploads/#modifying-upload-handlers-on-the-fly

对于 通用视图，但是，我找不到任何说明，我想出了以下内容：

from django.utils import importlib
from django.core.exceptions import ImproperlyConfigured
from django.views.decorators.csrf import csrf_protect

class UploadHandlerMixin(object):
    '''
        A mixin for Django generic views that installs a custom upload handler in front of
        the current chain of upload handlers.

        You specify the handler to install by overriding the 'upload_handler' attribute of
        the class, specifying the module and class name in the form 'path.to.module.class':

            class MyView(UploadHandlerMixin, View):
                upload_handler = 'path.to.module.MyUploadHandler'

        If you do not override 'upload_handler', no additional upload handler will be
        installed.

        If the CsrfViewMiddleware is installed (which is the default) then you must use
        your view as follows in your urls.py:

            from django.views.decorators.csrf import csrf_exempt
            url(r'^.../$', csrf_exempt(MyView.as_view()), ...),

        Internally, the UploadHandlerMixin mixin will install the upload handler and then
        perform the CSRF check. (This is necessary because the CSRF check inspects
        request.POST, and afterwards upload handlers cannot be changed, see documentation
        link given below.)

        The handler is installed as described in the Django documentation "Modifying upload handlers
        on the fly", see https://docs.djangoproject.com/en/dev/topics/http/file-uploads/#modifying-upload-handlers-on-the-fly
    '''

    upload_handler = None

    def dispatch(self, request, *args, **kwargs):
        if not self.upload_handler is None:
            request.upload_handlers.insert(0, UploadHandlerMixin._instantiate_upload_handler(self.upload_handler, request))
        return _uploadhandler_dispatch(request, self, *args, **kwargs)

    @staticmethod
    def _instantiate_upload_handler(path, *args, **kwargs):
        i = path.rfind('.')
        module, attr = path[:i], path[i+1:]
        try:
            mod = importlib.import_module(module)
        except ImportError, e:
            raise ImproperlyConfigured('Error importing upload handler module %s: "%s"' % (module, e))
        except ValueError, e:
            raise ImproperlyConfigured('Error importing upload handler module. Is FILE_UPLOAD_HANDLERS a correctly defined list or tuple?')
        try:
            cls = getattr(mod, attr)
        except AttributeError:
            raise ImproperlyConfigured('Module "%s" does not define a "%s" upload handler backend' % (module, attr))
        return cls(*args, **kwargs)

@csrf_protect
def _uploadhandler_dispatch(request, view, *args, **kwargs):
    return super(UploadHandlerMixin, view).dispatch(request, *args, **kwargs)

这是完成任务的“推荐方式”吗？安全方面还好吗？

Answer 1

回答我自己，服务端解决方案（例如具有自定义上传处理程序的 Django）的替代方案是客户端解决方案，例如 JQuery 文件上传。它利用了以下事实：较新的浏览器允许在客户端上读取上传进度。就我而言，这实现起来要简单得多，并且不会导致额外的服务器负载。