Cancel a p3a subscription via the API

[Michael Nelson]

I can't see any way to retrieve and/or cancel a subscription via the API. bug 530315 was created a while ago, and fixed with Person.getArchiveSubscriptionURLs(), and Person.getArchiveSubscriptionURL(archive), and these work well for getting the private PPA url as required.

If, on the other hand, the owner of an archive wants to cancel a subscription via the API I can't see how this can currently be done except when first creating the new subscription. (That is, an ArchiveSubscriber is returned when calling Archive.newSubscription(), but I can't see a way to get a handle on it at a later point... newSubscription() raises an exception if the subscription already exists).

[Michael Nelson (michael.nelson)]

I noticed since that I can do this with:
{{{
            subs_uri = lookup_service_root(settings.LP_SERVICE) + (
                "{version}/~{owner_name}/+archive/{ppa_name}/"
                "+subscriptions/{subscriber_name}".format(
                    version=settings.LP_VERSION, owner_name=owner_name,
                    ppa_name=ppa_name,
                    subscriber_name=subscriber_name)
            lp_subscription = self.launchpad_service.load(subs_uri)

            lp_subscription.status = 'Cancelled'
            lp_subscription.lp_save()
}}}

although of course it would be nice to not have to rely on the uri structure.