Remove presence lists (#4989)

Remove presence list support as per MSC 1819

7 files changed, 22 insertions, 338 deletions

diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index e85c49742d..3b22a22a19 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -113,27 +113,6 @@ class PresenceHandler(object):
         federation_registry.register_edu_handler(
             "m.presence", self.incoming_presence
         )
-        federation_registry.register_edu_handler(
-            "m.presence_invite",
-            lambda origin, content: self.invite_presence(
-                observed_user=UserID.from_string(content["observed_user"]),
-                observer_user=UserID.from_string(content["observer_user"]),
-            )
-        )
-        federation_registry.register_edu_handler(
-            "m.presence_accept",
-            lambda origin, content: self.accept_presence(
-                observed_user=UserID.from_string(content["observed_user"]),
-                observer_user=UserID.from_string(content["observer_user"]),
-            )
-        )
-        federation_registry.register_edu_handler(
-            "m.presence_deny",
-            lambda origin, content: self.deny_presence(
-                observed_user=UserID.from_string(content["observed_user"]),
-                observer_user=UserID.from_string(content["observer_user"]),
-            )
-        )
 
         active_presence = self.store.take_presence_startup_info()
 
@@ -760,137 +739,6 @@ class PresenceHandler(object):
         yield self._update_states([prev_state.copy_and_replace(**new_fields)])
 
     @defer.inlineCallbacks
-    def get_presence_list(self, observer_user, accepted=None):
-        """Returns the presence for all users in their presence list.
-        """
-        if not self.is_mine(observer_user):
-            raise SynapseError(400, "User is not hosted on this Home Server")
-
-        presence_list = yield self.store.get_presence_list(
-            observer_user.localpart, accepted=accepted
-        )
-
-        results = yield self.get_states(
-            target_user_ids=[row["observed_user_id"] for row in presence_list],
-            as_event=False,
-        )
-
-        now = self.clock.time_msec()
-        results[:] = [format_user_presence_state(r, now) for r in results]
-
-        is_accepted = {
-            row["observed_user_id"]: row["accepted"] for row in presence_list
-        }
-
-        for result in results:
-            result.update({
-                "accepted": is_accepted,
-            })
-
-        defer.returnValue(results)
-
-    @defer.inlineCallbacks
-    def send_presence_invite(self, observer_user, observed_user):
-        """Sends a presence invite.
-        """
-        yield self.store.add_presence_list_pending(
-            observer_user.localpart, observed_user.to_string()
-        )
-
-        if self.is_mine(observed_user):
-            yield self.invite_presence(observed_user, observer_user)
-        else:
-            yield self.federation.build_and_send_edu(
-                destination=observed_user.domain,
-                edu_type="m.presence_invite",
-                content={
-                    "observed_user": observed_user.to_string(),
-                    "observer_user": observer_user.to_string(),
-                }
-            )
-
-    @defer.inlineCallbacks
-    def invite_presence(self, observed_user, observer_user):
-        """Handles new presence invites.
-        """
-        if not self.is_mine(observed_user):
-            raise SynapseError(400, "User is not hosted on this Home Server")
-
-        # TODO: Don't auto accept
-        if self.is_mine(observer_user):
-            yield self.accept_presence(observed_user, observer_user)
-        else:
-            self.federation.build_and_send_edu(
-                destination=observer_user.domain,
-                edu_type="m.presence_accept",
-                content={
-                    "observed_user": observed_user.to_string(),
-                    "observer_user": observer_user.to_string(),
-                }
-            )
-
-            state_dict = yield self.get_state(observed_user, as_event=False)
-            state_dict = format_user_presence_state(state_dict, self.clock.time_msec())
-
-            self.federation.build_and_send_edu(
-                destination=observer_user.domain,
-                edu_type="m.presence",
-                content={
-                    "push": [state_dict]
-                }
-            )
-
-    @defer.inlineCallbacks
-    def accept_presence(self, observed_user, observer_user):
-        """Handles a m.presence_accept EDU. Mark a presence invite from a
-        local or remote user as accepted in a local user's presence list.
-        Starts polling for presence updates from the local or remote user.
-        Args:
-            observed_user(UserID): The user to update in the presence list.
-            observer_user(UserID): The owner of the presence list to update.
-        """
-        yield self.store.set_presence_list_accepted(
-            observer_user.localpart, observed_user.to_string()
-        )
-
-    @defer.inlineCallbacks
-    def deny_presence(self, observed_user, observer_user):
-        """Handle a m.presence_deny EDU. Removes a local or remote user from a
-        local user's presence list.
-        Args:
-            observed_user(UserID): The local or remote user to remove from the
-                list.
-            observer_user(UserID): The local owner of the presence list.
-        Returns:
-            A Deferred.
-        """
-        yield self.store.del_presence_list(
-            observer_user.localpart, observed_user.to_string()
-        )
-
-        # TODO(paul): Inform the user somehow?
-
-    @defer.inlineCallbacks
-    def drop(self, observed_user, observer_user):
-        """Remove a local or remote user from a local user's presence list and
-        unsubscribe the local user from updates that user.
-        Args:
-            observed_user(UserId): The local or remote user to remove from the
-                list.
-            observer_user(UserId): The local owner of the presence list.
-        Returns:
-            A Deferred.
-        """
-        if not self.is_mine(observer_user):
-            raise SynapseError(400, "User is not hosted on this Home Server")
-
-        yield self.store.del_presence_list(
-            observer_user.localpart, observed_user.to_string()
-        )
-
-        # TODO: Inform the remote that we've dropped the presence list.
-
-    @defer.inlineCallbacks
     def is_visible(self, observed_user, observer_user):
         """Returns whether a user can see another user's presence.
         """
@@ -904,11 +752,7 @@ class PresenceHandler(object):
         if observer_room_ids & observed_room_ids:
             defer.returnValue(True)
 
-        accepted_observers = yield self.store.get_presence_list_observers_accepted(
-            observed_user.to_string()
-        )
-
-        defer.returnValue(observer_user.to_string() in accepted_observers)
+        defer.returnValue(False)
 
     @defer.inlineCallbacks
     def get_all_presence_updates(self, last_id, current_id):
@@ -1204,10 +1048,7 @@ class PresenceEventSource(object):
         updates for
         """
         user_id = user.to_string()
-        plist = yield self.store.get_presence_list_accepted(
-            user.localpart, on_invalidate=cache_context.invalidate,
-        )
-        users_interested_in = set(row["observed_user_id"] for row in plist)
+        users_interested_in = set()
         users_interested_in.add(user_id)  # So that we receive our own presence
 
         users_who_share_room = yield self.store.get_users_who_share_room_with_user(
@@ -1412,10 +1253,6 @@ def get_interested_parties(store, states):
         for room_id in room_ids:
             room_ids_to_states.setdefault(room_id, []).append(state)
 
-        plist = yield store.get_presence_list_observers_accepted(state.user_id)
-        for u in plist:
-            users_to_states.setdefault(u, []).append(state)
-
         # Always notify self
         users_to_states.setdefault(state.user_id, []).append(state)
 
diff --git a/synapse/replication/slave/storage/presence.py b/synapse/replication/slave/storage/presence.py
index 9e530defe0..0ec1db25ce 100644
--- a/synapse/replication/slave/storage/presence.py
+++ b/synapse/replication/slave/storage/presence.py
@@ -39,16 +39,6 @@ class SlavedPresenceStore(BaseSlavedStore):
     _get_presence_for_user = PresenceStore.__dict__["_get_presence_for_user"]
     get_presence_for_users = PresenceStore.__dict__["get_presence_for_users"]
 
-    # XXX: This is a bit broken because we don't persist the accepted list in a
-    # way that can be replicated. This means that we don't have a way to
-    # invalidate the cache correctly.
-    get_presence_list_accepted = PresenceStore.__dict__[
-        "get_presence_list_accepted"
-    ]
-    get_presence_list_observers_accepted = PresenceStore.__dict__[
-        "get_presence_list_observers_accepted"
-    ]
-
     def get_current_presence_token(self):
         return self._presence_id_gen.get_current_token()
 
diff --git a/synapse/rest/client/v1/presence.py b/synapse/rest/client/v1/presence.py
index b5a6d6aebf..045d5a20ac 100644
--- a/synapse/rest/client/v1/presence.py
+++ b/synapse/rest/client/v1/presence.py
@@ -93,72 +93,5 @@ class PresenceStatusRestServlet(ClientV1RestServlet):
         return (200, {})
 
 
-class PresenceListRestServlet(ClientV1RestServlet):
-    PATTERNS = client_path_patterns("/presence/list/(?P<user_id>[^/]*)")
-
-    def __init__(self, hs):
-        super(PresenceListRestServlet, self).__init__(hs)
-        self.presence_handler = hs.get_presence_handler()
-
-    @defer.inlineCallbacks
-    def on_GET(self, request, user_id):
-        requester = yield self.auth.get_user_by_req(request)
-        user = UserID.from_string(user_id)
-
-        if not self.hs.is_mine(user):
-            raise SynapseError(400, "User not hosted on this Home Server")
-
-        if requester.user != user:
-            raise SynapseError(400, "Cannot get another user's presence list")
-
-        presence = yield self.presence_handler.get_presence_list(
-            observer_user=user, accepted=True
-        )
-
-        defer.returnValue((200, presence))
-
-    @defer.inlineCallbacks
-    def on_POST(self, request, user_id):
-        requester = yield self.auth.get_user_by_req(request)
-        user = UserID.from_string(user_id)
-
-        if not self.hs.is_mine(user):
-            raise SynapseError(400, "User not hosted on this Home Server")
-
-        if requester.user != user:
-            raise SynapseError(
-                400, "Cannot modify another user's presence list")
-
-        content = parse_json_object_from_request(request)
-
-        if "invite" in content:
-            for u in content["invite"]:
-                if not isinstance(u, string_types):
-                    raise SynapseError(400, "Bad invite value.")
-                if len(u) == 0:
-                    continue
-                invited_user = UserID.from_string(u)
-                yield self.presence_handler.send_presence_invite(
-                    observer_user=user, observed_user=invited_user
-                )
-
-        if "drop" in content:
-            for u in content["drop"]:
-                if not isinstance(u, string_types):
-                    raise SynapseError(400, "Bad drop value.")
-                if len(u) == 0:
-                    continue
-                dropped_user = UserID.from_string(u)
-                yield self.presence_handler.drop(
-                    observer_user=user, observed_user=dropped_user
-                )
-
-        defer.returnValue((200, {}))
-
-    def on_OPTIONS(self, request):
-        return (200, {})
-
-
 def register_servlets(hs, http_server):
     PresenceStatusRestServlet(hs).register(http_server)
-    PresenceListRestServlet(hs).register(http_server)
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index 81b4c57ad4..c1711bc8bd 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 # Remember to update this number every time a change is made to database
 # schema files, so the users will be informed on server restarts.
-SCHEMA_VERSION = 53
+SCHEMA_VERSION = 54
 
 dir_path = os.path.abspath(os.path.dirname(__file__))
 
diff --git a/synapse/storage/presence.py b/synapse/storage/presence.py
index 089ea8c048..42ec8c6bb8 100644
--- a/synapse/storage/presence.py
+++ b/synapse/storage/presence.py
@@ -19,7 +19,7 @@ from twisted.internet import defer
 
 from synapse.api.constants import PresenceState
 from synapse.util import batch_iter
-from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
+from synapse.util.caches.descriptors import cached, cachedList
 
 from ._base import SQLBaseStore
 
@@ -205,87 +205,3 @@ class PresenceStore(SQLBaseStore):
             },
             desc="disallow_presence_visible",
         )
-
-    def add_presence_list_pending(self, observer_localpart, observed_userid):
-        return self._simple_insert(
-            table="presence_list",
-            values={
-                "user_id": observer_localpart,
-                "observed_user_id": observed_userid,
-                "accepted": False,
-            },
-            desc="add_presence_list_pending",
-        )
-
-    def set_presence_list_accepted(self, observer_localpart, observed_userid):
-        def update_presence_list_txn(txn):
-            result = self._simple_update_one_txn(
-                txn,
-                table="presence_list",
-                keyvalues={
-                    "user_id": observer_localpart,
-                    "observed_user_id": observed_userid,
-                },
-                updatevalues={"accepted": True},
-            )
-
-            self._invalidate_cache_and_stream(
-                txn, self.get_presence_list_accepted, (observer_localpart,)
-            )
-            self._invalidate_cache_and_stream(
-                txn, self.get_presence_list_observers_accepted, (observed_userid,)
-            )
-
-            return result
-
-        return self.runInteraction(
-            "set_presence_list_accepted", update_presence_list_txn
-        )
-
-    def get_presence_list(self, observer_localpart, accepted=None):
-        if accepted:
-            return self.get_presence_list_accepted(observer_localpart)
-        else:
-            keyvalues = {"user_id": observer_localpart}
-            if accepted is not None:
-                keyvalues["accepted"] = accepted
-
-            return self._simple_select_list(
-                table="presence_list",
-                keyvalues=keyvalues,
-                retcols=["observed_user_id", "accepted"],
-                desc="get_presence_list",
-            )
-
-    @cached()
-    def get_presence_list_accepted(self, observer_localpart):
-        return self._simple_select_list(
-            table="presence_list",
-            keyvalues={"user_id": observer_localpart, "accepted": True},
-            retcols=["observed_user_id", "accepted"],
-            desc="get_presence_list_accepted",
-        )
-
-    @cachedInlineCallbacks()
-    def get_presence_list_observers_accepted(self, observed_userid):
-        user_localparts = yield self._simple_select_onecol(
-            table="presence_list",
-            keyvalues={"observed_user_id": observed_userid, "accepted": True},
-            retcol="user_id",
-            desc="get_presence_list_accepted",
-        )
-
-        defer.returnValue(["@%s:%s" % (u, self.hs.hostname) for u in user_localparts])
-
-    @defer.inlineCallbacks
-    def del_presence_list(self, observer_localpart, observed_userid):
-        yield self._simple_delete_one(
-            table="presence_list",
-            keyvalues={
-                "user_id": observer_localpart,
-                "observed_user_id": observed_userid,
-            },
-            desc="del_presence_list",
-        )
-        self.get_presence_list_accepted.invalidate((observer_localpart,))
-        self.get_presence_list_observers_accepted.invalidate((observed_userid,))
diff --git a/synapse/storage/schema/delta/54/drop_presence_list.sql b/synapse/storage/schema/delta/54/drop_presence_list.sql
new file mode 100644
index 0000000000..e6ee70c623
--- /dev/null
+++ b/synapse/storage/schema/delta/54/drop_presence_list.sql
@@ -0,0 +1,16 @@
+/* Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+DROP TABLE IF EXISTS presence_list;
diff --git a/synapse/storage/schema/full_schemas/16/presence.sql b/synapse/storage/schema/full_schemas/16/presence.sql
index 283136df20..0892c4cf96 100644
--- a/synapse/storage/schema/full_schemas/16/presence.sql
+++ b/synapse/storage/schema/full_schemas/16/presence.sql
@@ -28,13 +28,5 @@ CREATE TABLE IF NOT EXISTS presence_allow_inbound(
   UNIQUE (observed_user_id, observer_user_id)
 );
 
--- For each of /my/ users (watcher), which possibly-remote users are they
--- watching?
-CREATE TABLE IF NOT EXISTS presence_list(
-  user_id TEXT NOT NULL,
-  observed_user_id TEXT NOT NULL, -- a UserID,
-  accepted BOOLEAN NOT NULL,
-  UNIQUE (user_id, observed_user_id)
-);
-
-CREATE INDEX presence_list_user_id ON presence_list (user_id);
+-- We used to create a table called presence_list, but this is no longer used 
+-- and is removed in delta 54.
\ No newline at end of file