mirror of
https://github.com/encode/django-rest-framework.git
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125 lines
4.6 KiB
Python
125 lines
4.6 KiB
Python
from djangorestframework.response import ResponseException
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from djangorestframework import status
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try:
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import json
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except ImportError:
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import simplejson as json
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class ParserMixin(object):
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parsers = ()
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def parse(self, content_type, content):
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# See RFC 2616 sec 3 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7
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split = content_type.split(';', 1)
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if len(split) > 1:
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content_type = split[0]
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content_type = content_type.strip()
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media_type_to_parser = dict([(parser.media_type, parser) for parser in self.parsers])
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try:
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parser = media_type_to_parser[content_type]
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except KeyError:
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raise ResponseException(status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
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{'error': 'Unsupported media type in request \'%s\'.' % content_type})
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return parser(self).parse(content)
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@property
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def parsed_media_types(self):
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"""Return an list of all the media types that this ParserMixin can parse."""
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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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"""Return the ParerMixin's most prefered emitter.
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(This has no behavioural effect, but is may be used by documenting emitters)"""
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return self.parsers[0]
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class BaseParser(object):
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"""All parsers should extend BaseParser, specifing a media_type attribute,
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and overriding the parse() method."""
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media_type = None
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def __init__(self, resource):
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"""Initialise the parser with the Resource instance as state,
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in case the parser needs to access any metadata on the Resource object."""
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self.resource = resource
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def parse(self, input):
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"""Given some serialized input, return the deserialized output.
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The input will be the raw request content body. The return value may be of
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any type, but for many parsers/inputs it might typically be a dict."""
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return input
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class JSONParser(BaseParser):
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media_type = 'application/json'
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def parse(self, input):
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try:
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return json.loads(input)
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except ValueError, exc:
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raise ResponseException(status.HTTP_400_BAD_REQUEST, {'detail': 'JSON parse error - %s' % str(exc)})
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class XMLParser(BaseParser):
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media_type = 'application/xml'
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class FormParser(BaseParser):
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"""The default parser for form data.
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Return a dict containing a single value for each non-reserved parameter.
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"""
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media_type = 'application/x-www-form-urlencoded'
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def parse(self, input):
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# The FormParser doesn't parse the input as other parsers would, since Django's already done the
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# form parsing for us. We build the content object from the request directly.
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request = self.resource.request
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if request.method == 'PUT':
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# Fix from piston to force Django to give PUT requests the same
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# form processing that POST requests get...
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#
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# Bug fix: if _load_post_and_files has already been called, for
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# example by middleware accessing request.POST, the below code to
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# pretend the request is a POST instead of a PUT will be too late
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# to make a difference. Also calling _load_post_and_files will result
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# in the following exception:
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# AttributeError: You cannot set the upload handlers after the upload has been processed.
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# The fix is to check for the presence of the _post field which is set
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# the first time _load_post_and_files is called (both by wsgi.py and
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# modpython.py). If it's set, the request has to be 'reset' to redo
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# the query value parsing in POST mode.
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if hasattr(request, '_post'):
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del request._post
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del request._files
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try:
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request.method = "POST"
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request._load_post_and_files()
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request.method = "PUT"
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except AttributeError:
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request.META['REQUEST_METHOD'] = 'POST'
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request._load_post_and_files()
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request.META['REQUEST_METHOD'] = 'PUT'
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# Strip any parameters that we are treating as reserved
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data = {}
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for (key, val) in request.POST.items():
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if key not in self.resource.RESERVED_FORM_PARAMS:
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data[key] = val
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return data
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# TODO: Allow parsers to specify multiple media_types
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class MultipartParser(FormParser):
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media_type = 'multipart/form-data'
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