def callback(request, pk):
if request.method == 'GET':
mode = request.GET['hub.mode']
topic = request.GET['hub.topic']
challenge = request.GET['hub.challenge']
lease_seconds = request.GET.get('hub.lease_seconds')
verify_token = request.GET.get('hub.verify_token', '')
if mode == 'subscribe':
if not verify_token.startswith('subscribe'):
raise Http404
subscription = get_object_or_404(Subscription,
pk=pk,
topic=topic,
verify_token=verify_token)
subscription.verified = True
subscription.set_expiration(int(lease_seconds))
verified.send(sender=subscription)
return HttpResponse(challenge, content_type='text/plain')
elif request.method == 'POST':
subscription = get_object_or_404(Subscription, pk=pk)
parsed = feedparser.parse(request.raw_post_data)
if parsed.feed.links: # single notification
hub_url = subscription.hub
self_url = subscription.topic
for link in parsed.feed.links:
if link['rel'] == 'hub':
hub_url = link['href']
elif link['rel'] == 'self':
self_url = link['href']
needs_update = False
if hub_url and subscription.hub != hub_url:
# hub URL has changed; let's update our subscription
needs_update = True
elif self_url != subscription.topic:
# topic URL has changed
needs_update = True
if needs_update:
expiration_time = subscription.lease_expires - datetime.now()
seconds = expiration_time.days*86400 + expiration_time.seconds
Subscription.objects.subscribe(
self_url, hub_url,
callback=request.build_absolute_uri(),
lease_seconds=seconds)
updated.send(sender=subscription, update=parsed)
return HttpResponse('')
return Http404
def callback(request, pk):
if request.method == 'GET':
try:
mode = request.GET['hub.mode']
topic = request.GET['hub.topic']
challenge = request.GET['hub.challenge']
lease_seconds = request.GET.get(
'hub.lease_seconds',
DEFAULT_LEASE_SECONDS,
)
verify_token = request.GET.get('hub.verify_token', '')
except MultiValueDictKeyError:
# Raise 404 instead of 500 error
raise Http404
try:
subscription = Subscription.objects.get(
pk=pk,
topic=topic,
verify_token=verify_token,
)
except Subscription.DoesNotExist:
# XXX Hack. Hubs may re-encode already encoded
# data sent during the initial subscription request.
# Do one last "unquote" just to be safe:
topic = urllib.unquote(topic)
try:
subscription = Subscription.objects.get(
pk=pk,
topic=topic,
verify_token=verify_token,
)
except Subscription.DoesNotExist:
raise Http404
if mode == 'subscribe':
if not verify_token.startswith('subscribe'):
raise Http404
subscription.verified = True
subscription.is_subscribed = True
subscription.set_expiration(int(lease_seconds))
verified.send(sender=subscription)
elif mode == 'unsubscribe':
if not verify_token.startswith('unsubscribe'):
raise Http404
subscription.verified = False
subscription.is_subscribed = False
subscription.set_expiration(int(lease_seconds))
return HttpResponse(challenge, content_type='text/plain')
elif request.method == 'POST':
subscription = get_object_or_404(Subscription, pk=pk)
parsed = feedparser.parse(
getattr(request, 'body', request.raw_post_data), )
if parsed.feed.links: # single notification
hub_url = subscription.hub
self_url = subscription.topic
for link in parsed.feed.links:
if link['rel'] == 'hub':
hub_url = link['href']
elif link['rel'] == 'self':
self_url = link['href']
needs_update = False
if hub_url and subscription.hub != hub_url:
# hub URL has changed; let's update our subscription
needs_update = True
elif self_url != subscription.topic:
# topic URL has changed
needs_update = True
if needs_update:
subscription_needs_update.send(
sender=subscription,
hub_url=hub_url,
topic_url=self_url,
)
updated.send(sender=subscription, update=parsed)
return HttpResponse('')
return Http404
