add Web.maybe_superfeedr_unsubscribe

for #550

tests/test_web.py

@@ -1,5 +1,6 @@
 """Unit tests for webmention.py."""
 import copy
+from datetime import timedelta
 from unittest.mock import ANY, patch
 
 from flask import g, get_flashed_messages
@@ -518,9 +519,11 @@ class WebTest(TestCase):
 
         user = Web.get_or_create('user.com')
         self.assertEqual('user.com', user.key.id())
-        self.assert_entities_equal(user, self.user,
-                                   ignore=['superfeedr_subscribed', 'updated'])
-        self.assertTrue(user.superfeedr_subscribed)
+        self.assert_entities_equal(
+            user, self.user,
+            ignore=['superfeedr_subscribed', 'superfeedr_subscribed_feed', 'updated'])
+        self.assertEqual(NOW, user.superfeedr_subscribed)
+        self.assertEqual('https://foo/atom', user.superfeedr_subscribed_feed)
 
         self.assert_req(mock_post, SUPERFEEDR_PUSH_API, data={
             'hub.mode': 'subscribe',
@@ -1813,7 +1816,6 @@ class WebTest(TestCase):
         self.assertEqual(400, got.status_code)
 
     @patch('oauth_dropins.webutil.appengine_config.tasks_client.create_task')
-    @patch('oauth_dropins.webutil.appengine_info.LOCAL_SERVER', False)
     def test_maybe_superfeedr_subscribe(self, mock_create_task, mock_get, mock_post):
         common.RUN_TASKS_INLINE = False
 
@@ -1862,6 +1864,8 @@ class WebTest(TestCase):
             'retrieve': 'true',
         }, auth=ANY)
         self.assertEqual(NOW, self.user.key.get().superfeedr_subscribed)
+        self.assertEqual('https://foo/atom',
+                         self.user.key.get().superfeedr_subscribed_feed)
 
         obj = Object.get_by_id('http://domain.tld/entry/1')
         self.assertIn(entries[0], obj.atom)
@@ -1873,7 +1877,6 @@ class WebTest(TestCase):
         self.assert_task(mock_create_task, 'receive', '/queue/receive',
                          obj=obj.key.urlsafe(), authed_as='user.com')
 
-
     def test_maybe_superfeedr_subscribe_no_feed(self, mock_get, mock_post):
         self.user.obj.mf2 = ACTOR_MF2  # no rel-urls
         web.maybe_superfeedr_subscribe(self.user)
@@ -1885,6 +1888,38 @@ class WebTest(TestCase):
         web.maybe_superfeedr_subscribe(self.user)
         # should be a noop
 
+    def test_maybe_superfeedr_unsubscribe(self, mock_get, mock_post):
+        appengine_info.LOCAL_SERVER = False
+
+        self.user.superfeedr_subscribed = NOW
+        self.user.superfeedr_subscribed_feed = 'http://feed'
+        self.user.put()
+
+        mock_post.return_value = requests_response('OK')
+
+        web.maybe_superfeedr_unsubscribe(self.user)
+        self.assert_req(mock_post, SUPERFEEDR_PUSH_API, data={
+            'hub.mode': 'unsubscribe',
+            'hub.topic': 'http://feed',
+            'hub.callback': 'http://localhost/superfeedr/notify/user.com',
+        }, auth=ANY)
+
+    def test_maybe_superfeedr_unsubscribe_not_subscribed(self, mock_get, mock_post):
+        appengine_info.LOCAL_SERVER = False
+
+        web.maybe_superfeedr_unsubscribe(self.user)
+        mock_post.assert_not_called()
+
+    def test_maybe_superfeedr_unsubscribe_last_webmention_later(self, _, mock_post):
+        appengine_info.LOCAL_SERVER = False
+
+        self.user.superfeedr_subscribed = NOW
+        self.user.last_webmention_in = NOW + timedelta(days=1)
+        self.user.put()
+
+        web.maybe_superfeedr_unsubscribe(self.user)
+        mock_post.assert_not_called()
+
     def _test_verify(self, redirects, hcard, actor, redirects_error=None):
         self.user.has_redirects = False
         self.user.put()

web.py

@@ -97,6 +97,7 @@ class Web(User, Protocol):
     has_hcard = ndb.BooleanProperty()
     last_webmention_in = ndb.DateTimeProperty(tzinfo=timezone.utc)
     superfeedr_subscribed = ndb.DateTimeProperty(tzinfo=timezone.utc)
+    superfeedr_subscribed_feed = ndb.StringProperty()
 
     # Originally, BF served Web users' AP actor ids on fed.brid.gy, eg
     # https://fed.brid.gy/snarfed.org . When we started adding new protocols, we
@@ -642,6 +643,7 @@ def maybe_superfeedr_subscribe(user):
     resp.raise_for_status()
 
     user.superfeedr_subscribed = util.now()
+    user.superfeedr_subscribed_feed = url
     user.put()
 
     # handle feed entries (posts)
@@ -650,6 +652,31 @@ def maybe_superfeedr_subscribe(user):
         return _superfeedr_notify(resp.text, user=user)
 
 
+def maybe_superfeedr_unsubscribe(user):
+    """Subscribes to a user's Atom or RSS feed in Superfeedr.
+
+    Args:
+      user (Web)
+    """
+    if (not user.superfeedr_subscribed
+            or not user.superfeedr_subscribed_feed
+            or (user.last_webmention_in
+                and user.last_webmention_in > user.superfeedr_subscribed)
+            or appengine_info.LOCAL_SERVER):
+        return
+
+    # unsubscribe
+    logger.info(f'Unsubscribing from Superfeedr for {user.superfeedr_subscribed_feed}')
+
+    auth = HTTPBasicAuth(SUPERFEEDR_USERNAME, SUPERFEEDR_TOKEN)
+    resp = util.requests_post(SUPERFEEDR_PUSH_API, auth=auth, data={
+        'hub.mode': 'unsubscribe',
+        'hub.topic': user.superfeedr_subscribed_feed,
+        'hub.callback': common.host_url(f'/superfeedr/notify/{user.key.id()}'),
+    })
+    resp.raise_for_status()
+
+
 # generate/check per-user token for auth?
 # or https://documentation.superfeedr.com/subscribers.html#http-authentication ?
 @app.post(f'/superfeedr/notify/<regex("{DOMAIN_RE}"):domain>')