from core import settings

from django.http.response import HttpResponseNotFound, HttpResponse,\

    HttpResponseBadRequest

from django.views.generic import View

import requests

from requests.exceptions import HTTPError

class SparqlEndpointProxy(View):

    def get(self, request, wp_lang):

        params = request.GET.dict()

        if not wp_lang or wp_lang not in settings.WIKIPEDIA_URLS:

                return HttpResponseBadRequest("The wp_lang parameter is compulsory and must be in %s" % repr(settings.WIKIPEDIA_URLS.keys()))  # @UndefinedVariable

        url = settings.WIKIPEDIA_URLS.get(wp_lang, {}).get('dbpedia_sparql_url', None)  # @UndefinedVariable

        if not url or not url.startswith("http"):

            return HttpResponseNotFound("No or bad url for %s: %s" % (wp_lang,repr(url)))

        try:

            resp = requests.get(url, params=params)

            return HttpResponse(content=resp.text, content_type=resp.headers.get('content-type'))

        except HTTPError as e:

            return HttpResponse(unicode(e), status=e.status_code)