content negotiation mixin for django class based views

negotiation.py

import mimeparse


class ContentNegotiationMixin(object):
    def not_acceptable(self, request):
        return HttpResponse(status=406)

    def get_acceptable(self, request):
        return dict(self.accepts)

    def negotiate(self, request, *args, **kwargs):
        acceptable = self.get_acceptable(request)
        mime_type = mimeparse.best_match(acceptable.keys(), request.META['HTTP_ACCEPT'])
        if mime_type in acceptable:
            acceptor = acceptable[mime_type]
            if isinstance(acceptor, basestring):
                acceptor = getattr(self, acceptor)
            return acceptor(request, *args, **kwargs)
        return self.not_acceptable(request)