def select_parser(self, request, parsers): """ Given a list of parsers and a media type, return the appropriate parser to handle the incoming request. """ for parser in parsers: if media_type_matches(parser.media_type, request.content_type): return parser return None
def select_renderer(self, request, renderers, format_suffix=None): """ Given a request and a list of renderers, return a two-tuple of: (renderer, media type). """ # Allow URL style format override. eg. "?format=json format_query_param = self.settings.URL_FORMAT_OVERRIDE format = format_suffix or request.query_params.get(format_query_param) if format: renderers = self.filter_renderers(renderers, format) accepts = self.get_accept_list(request) # Check the acceptable media types against each renderer, # attempting more specific media types first # NB. The inner loop here isn't as bad as it first looks :) # Worst case is we're looping over len(accept_list) * len(self.renderers) for media_type_set in order_by_precedence(accepts): for renderer in renderers: for media_type in media_type_set: if media_type_matches(renderer.media_type, media_type): # Return the most specific media type as accepted. if ( _MediaType(renderer.media_type).precedence > _MediaType(media_type).precedence ): # Eg client requests '*/*' # Accepted media type is 'application/json' return renderer, renderer.media_type else: # Eg client requests 'application/json; indent=8' # Accepted media type is 'application/json; indent=8' return renderer, media_type raise exceptions.NotAcceptable(available_renderers=renderers)