Thanks Brett,
That's what I ended up doing, and I just wanted to make sure there
wasn't another way that I was missing. Now I'm including the topic URL + hub
URL + signature in the callback URL and that's working for me. That is, in
addition to a key to the record in my database that tracks the subscription.
I need the information in both places for error detection and
self-correction, given that there is always a margin of error in distributed
systems like the PSHB model.
Regards,
Waleed
On Tue, Feb 23, 2010 at 1:56 PM, Brett Slatkin <[email protected]> wrote:
> Hey Waleed,
>
> This is why there's automatic subscription refreshing:
>
>
> http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#autorefresh
>
> Just wait for the Hub to send you the refresh request and if you don't
> know anything about the feed return a 404.
>
> In the meantime, ignore all the updates for callback URLs you don't
> know. This is why it's important to encode some information about the
> subscription in your callback URL (like a primary key in your database
> that points to the subscription record).
>
> Hope that helps,
>
> -Brett
>
> On Sun, Feb 21, 2010 at 4:20 PM, Waleed Abdulla <[email protected]> wrote:
> > Hi everyone,
> > I'm getting PSHB updates for feeds that I have previously subscribed
> to
> > but I don't want them anymore. To issue an unsubscribe request, I need to
> > know the hub url and the topic url, of which I only have the hub url
> because
> > I had encoded it in the callback URL when I subscribed, but I don't have
> the
> > topic URL (long story, don't ask :)
> > I started to parse the feed content to extract the topic URL from it
> > from the <link rel='self'> tag. That worked for a few feeds, but I
> quickly
> > found out that Blogger.com blogs actually put a different feed URL in the
> > "self" link, and they put the actual feed URL in a different tag:
> > <link rel='http://schemas.google.com/g/2005#feed' ...>
> > So I put an exception for blogger.com blogs to grab the topic URL
> from
> > the other link. That worked for many feeds, but I still have many other
> > updates I receive in which the feed doesn't contain a self link at all or
> > it's a bozo feed that can't be parsed. Am I missing something
> obvious? Any
> > suggestions?
> > Regards,
> > Waleed
> >
> >
>
