linked_decorator.py

"""
Linked data decorator hack for rdf/xml and html representations:

def company(request, company_id):
    # return html for company
    ...

@rdf_view
def company_rdf(request, company_id):
    # return rdf/xml for company
    ...
    
"""


import re

import django.core 
import mimeparse

def rdf_view(f):
    def f1(request, **kwargs):
        # construct a http redirect response to html view
        html_view = f.func_name.replace('_rdf', '')
        html_url = django.core.urlresolvers.reverse(html_view, kwargs=kwargs)
        html_redirect = responses.HttpResponseSeeOther(html_url)

        # determine the clients preferred representation
        available = ['text/html', 'application/rdf+xml']
        accept = request.META.get('HTTP_ACCEPT', 'application/rdf+xml')
        match = mimeparse.best_match(available, accept)

        # figure out what user agent we are talking to
        ua = request.META.get('HTTP_USER_AGENT')

        if request.get_full_path().endswith('.rdf'):
            return f(request, **kwargs)
        elif ua and 'MSIE' in ua:
            return html_redirect
        elif match == 'application/rdf+xml':
            response = f(request, **kwargs)
            response['Vary'] = 'Accept'
            return response
        elif match == 'text/html':
            return html_redirect
        else:
            return responses.HttpResponseUnsupportedMediaType()
    return f1