mirror of
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224 lines
7.8 KiB
Python
224 lines
7.8 KiB
Python
"""
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The :mod:`request` module provides a :class:`Request` class that can be used
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to enhance the standard `request` object received in all the views.
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This enhanced request object offers the following :
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- content automatically parsed according to `Content-Type` header, and available as :meth:`request.DATA<Request.DATA>`
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- full support of PUT method, including support for file uploads
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- form overloading of HTTP method, content type and content
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"""
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from django.http import HttpRequest
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from djangorestframework.utils.mediatypes import is_form_media_type, order_by_precedence
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from djangorestframework.utils import as_tuple
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from StringIO import StringIO
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__all__ = ('Request',)
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def request_class_factory(request):
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"""
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Builds and returns a request class, to be used as a replacement of Django's built-in.
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In fact :class:`request.Request` needs to be mixed-in with a subclass of `HttpRequest` for use,
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and we cannot do that before knowing which subclass of `HttpRequest` is used. So this function
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takes a request instance as only argument, and returns a properly mixed-in request class.
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"""
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request_class = type(request)
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return type(request_class.__name__, (Request, request_class), {})
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class Request(object):
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"""
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A mixin class allowing to enhance Django's standard HttpRequest.
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"""
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_USE_FORM_OVERLOADING = True
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_METHOD_PARAM = '_method'
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_CONTENTTYPE_PARAM = '_content_type'
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_CONTENT_PARAM = '_content'
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parsers = ()
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"""
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The set of parsers that the request can handle.
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Should be a tuple/list of classes as described in the :mod:`parsers` module.
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"""
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def __init__(self, request):
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# this allows to "copy" a request object into a new instance
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# of our custom request class.
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# First, we prepare the attributes to copy.
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attrs_dict = request.__dict__.copy()
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attrs_dict.pop('method', None)
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attrs_dict['_raw_method'] = request.method
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# Then, put them in the instance's own __dict__
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self.__dict__ = attrs_dict
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@property
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def method(self):
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"""
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Returns the HTTP method.
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This allows the `method` to be overridden by using a hidden `form` field
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on a form POST request.
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"""
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if not hasattr(self, '_method'):
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self._load_method_and_content_type()
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return self._method
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@property
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def content_type(self):
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"""
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Returns the content type header.
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This should be used instead of ``request.META.get('HTTP_CONTENT_TYPE')``,
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as it allows the content type to be overridden by using a hidden form
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field on a form POST request.
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"""
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if not hasattr(self, '_content_type'):
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self._load_method_and_content_type()
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return self._content_type
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@property
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def DATA(self):
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"""
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Parses the request body and returns the data.
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Similar to ``request.POST``, except that it handles arbitrary parsers,
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and also works on methods other than POST (eg PUT).
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"""
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if not hasattr(self, '_data'):
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self._load_data_and_files()
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return self._data
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@property
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def FILES(self):
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"""
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Parses the request body and returns the files.
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Similar to ``request.FILES``, except that it handles arbitrary parsers,
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and also works on methods other than POST (eg PUT).
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"""
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if not hasattr(self, '_files'):
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self._load_data_and_files()
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return self._files
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def _load_post_and_files(self):
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"""
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Overrides the parent's `_load_post_and_files` to isolate it
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from the form overloading mechanism (see: `_perform_form_overloading`).
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"""
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# When self.POST or self.FILES are called they need to know the original
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# HTTP method, not our overloaded HTTP method. So, we save our overloaded
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# HTTP method and restore it after the call to parent.
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method_mem = getattr(self, '_method', None)
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self._method = self._raw_method
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super(Request, self)._load_post_and_files()
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if method_mem is None:
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del self._method
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else:
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self._method = method_mem
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def _load_data_and_files(self):
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"""
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Parses the request content into self.DATA and self.FILES.
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"""
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if not hasattr(self, '_content_type'):
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self._load_method_and_content_type()
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if not hasattr(self, '_data'):
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(self._data, self._files) = self._parse(self._get_stream(), self._content_type)
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def _load_method_and_content_type(self):
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"""
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Sets the method and content_type, and then check if they've been overridden.
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"""
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self._content_type = self.META.get('HTTP_CONTENT_TYPE', self.META.get('CONTENT_TYPE', ''))
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self._perform_form_overloading()
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# if the HTTP method was not overloaded, we take the raw HTTP method
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if not hasattr(self, '_method'):
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self._method = self._raw_method
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def _get_stream(self):
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"""
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Returns an object that may be used to stream the request content.
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"""
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try:
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content_length = int(self.META.get('CONTENT_LENGTH', self.META.get('HTTP_CONTENT_LENGTH')))
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except (ValueError, TypeError):
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content_length = 0
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# TODO: Add 1.3's LimitedStream to compat and use that.
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# NOTE: Currently only supports parsing request body as a stream with 1.3
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if content_length == 0:
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return None
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elif hasattr(self, 'read'):
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return self
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return StringIO(self.raw_post_data)
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def _perform_form_overloading(self):
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"""
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If this is a form POST request, then we need to check if the method and content/content_type have been
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overridden by setting them in hidden form fields or not.
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"""
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# We only need to use form overloading on form POST requests.
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if not self._USE_FORM_OVERLOADING or self._raw_method != 'POST' or not is_form_media_type(self._content_type):
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return
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# At this point we're committed to parsing the request as form data.
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self._data = data = self.POST.copy()
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self._files = self.FILES
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# Method overloading - change the method and remove the param from the content.
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if self._METHOD_PARAM in data:
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# NOTE: unlike `get`, `pop` on a `QueryDict` seems to return a list of values.
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self._method = self._data.pop(self._METHOD_PARAM)[0].upper()
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# Content overloading - modify the content type, and re-parse.
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if self._CONTENT_PARAM in data and self._CONTENTTYPE_PARAM in data:
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self._content_type = self._data.pop(self._CONTENTTYPE_PARAM)[0]
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stream = StringIO(self._data.pop(self._CONTENT_PARAM)[0])
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(self._data, self._files) = self._parse(stream, self._content_type)
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def _parse(self, stream, content_type):
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"""
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Parse the request content.
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May raise a 415 ErrorResponse (Unsupported Media Type), or a 400 ErrorResponse (Bad Request).
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"""
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if stream is None or content_type is None:
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return (None, None)
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parsers = as_tuple(self.parsers)
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for parser_cls in parsers:
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parser = parser_cls(self)
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if parser.can_handle_request(content_type):
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return parser.parse(stream)
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raise ErrorResponse(status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
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{'error': 'Unsupported media type in request \'%s\'.' %
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content_type})
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@property
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def _parsed_media_types(self):
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"""
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Return a list of all the media types that this view can parse.
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"""
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return [parser.media_type for parser in self.parsers]
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@property
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def _default_parser(self):
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"""
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Return the view's default parser class.
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"""
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return self.parsers[0]
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