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https://github.com/encode/django-rest-framework.git
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64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
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from djangorestframework import exceptions
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from djangorestframework.settings import api_settings
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from djangorestframework.utils.mediatypes import order_by_precedence
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import re
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MSIE_USER_AGENT_REGEX = re.compile(r'^Mozilla/[0-9]+\.[0-9]+ \([^)]*; MSIE [0-9]+\.[0-9]+[a-z]?;[^)]*\)(?!.* Opera )')
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class BaseContentNegotiation(object):
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def determine_renderer(self, request, renderers):
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raise NotImplementedError('.determine_renderer() must be implemented')
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class DefaultContentNegotiation(object):
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settings = api_settings
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def negotiate(self, request, renderers):
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"""
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Given a request and a list of renderers, return a two-tuple of:
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(renderer, media type).
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"""
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accepts = self.get_accept_list(request)
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# Check the acceptable media types against each renderer,
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# attempting more specific media types first
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# NB. The inner loop here isn't as bad as it first looks :)
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# Worst case is we're looping over len(accept_list) * len(self.renderers)
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for media_type_set in order_by_precedence(accepts):
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for renderer in renderers:
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for media_type in media_type_set:
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if renderer.can_handle_media_type(media_type):
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return renderer, media_type
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raise exceptions.NotAcceptable(available_renderers=renderers)
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def get_accept_list(self, request):
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"""
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Given the incoming request, return a tokenised list of
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media type strings.
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"""
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if self.settings.URL_ACCEPT_OVERRIDE:
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# URL style accept override. eg. "?accept=application/json"
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override = request.GET.get(self.settings.URL_ACCEPT_OVERRIDE)
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if override:
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return [override]
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if (self.settings.IGNORE_MSIE_ACCEPT_HEADER and
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'HTTP_USER_AGENT' in request.META and
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MSIE_USER_AGENT_REGEX.match(request.META['HTTP_USER_AGENT']) and
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request.META.get('HTTP_X_REQUESTED_WITH', '').lower() != 'xmlhttprequest'):
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# Ignore MSIE's broken accept behavior except for AJAX requests
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# and do something sensible instead
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return ['text/html', '*/*']
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if 'HTTP_ACCEPT' in request.META:
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# Standard HTTP Accept negotiation
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# Accept header specified
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tokens = request.META['HTTP_ACCEPT'].split(',')
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return [token.strip() for token in tokens]
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# Standard HTTP Accept negotiation
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# No accept header specified
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return ['*/*']
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