Email unsubscribing that may in theory, work

Were it not for that fact that you can't use the base handler in the pusher because it pulls in the world. Comitting while I fix that on a different branch.

synapse/push/mailer.py

@@ -81,6 +81,7 @@ class Mailer(object):
     def __init__(self, hs):
         self.hs = hs
         self.store = self.hs.get_datastore()
+        self.handlers = self.hs.get_handlers()
         self.state_handler = self.hs.get_state_handler()
         loader = jinja2.FileSystemLoader(self.hs.config.email_template_dir)
         self.app_name = self.hs.config.email_app_name
@@ -95,7 +96,8 @@ class Mailer(object):
         )
 
     @defer.inlineCallbacks
-    def send_notification_mail(self, user_id, email_address, push_actions, reason):
+    def send_notification_mail(self, app_id, user_id, email_address,
+                               push_actions, reason):
         raw_from = email.utils.parseaddr(self.hs.config.email_notif_from)[1]
         raw_to = email.utils.parseaddr(email_address)[1]
 
@@ -157,7 +159,7 @@ class Mailer(object):
 
         template_vars = {
             "user_display_name": user_display_name,
-            "unsubscribe_link": self.make_unsubscribe_link(),
+            "unsubscribe_link": self.make_unsubscribe_link(app_id, email_address),
             "summary_text": summary_text,
             "app_name": self.app_name,
             "rooms": rooms,
@@ -423,9 +425,18 @@ class Mailer(object):
                 notif['room_id'], notif['event_id']
             )
 
-    def make_unsubscribe_link(self):
-        # XXX: matrix.to
-        return "https://vector.im/#/settings"
+    def make_unsubscribe_link(self, app_id, email_address):
+        params = {
+            "access_token": self.handlers.auth.generate_delete_pusher_token(),
+            "app_id": app_id,
+            "pushkey": email_address,
+        }
+
+        # XXX: make r0 once API is stable
+        return "%s_matrix/client/unstable/pushers/remove?%s" % (
+            self.hs.config.public_baseurl,
+            urllib.urlencode(params),
+        )
 
     def mxc_to_http_filter(self, value, width, height, resize_method="crop"):
         if value[0:6] != "mxc://":