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-rw-r--r--synapse/handlers/auth.py9
-rw-r--r--synapse/handlers/device.py171
-rw-r--r--synapse/handlers/directory.py12
-rw-r--r--synapse/handlers/e2e_keys.py16
-rw-r--r--synapse/handlers/federation.py3
-rw-r--r--synapse/handlers/message.py132
-rw-r--r--synapse/handlers/oidc_handler.py11
-rw-r--r--synapse/handlers/room.py16
-rw-r--r--synapse/handlers/room_member.py44
-rw-r--r--synapse/handlers/stats.py2
-rw-r--r--synapse/handlers/sync.py36
11 files changed, 302 insertions, 150 deletions
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 00eae92052..f6d17c53b1 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -164,7 +164,14 @@ class AuthHandler(BaseHandler):
 
         self.bcrypt_rounds = hs.config.bcrypt_rounds
 
+        # we can't use hs.get_module_api() here, because to do so will create an
+        # import loop.
+        #
+        # TODO: refactor this class to separate the lower-level stuff that
+        #   ModuleApi can use from the higher-level stuff that uses ModuleApi, as
+        #   better way to break the loop
         account_handler = ModuleApi(hs, self)
+
         self.password_providers = [
             module(config=config, account_handler=account_handler)
             for module, config in hs.config.password_providers
@@ -212,7 +219,7 @@ class AuthHandler(BaseHandler):
         self._clock = self.hs.get_clock()
 
         # Expire old UI auth sessions after a period of time.
-        if hs.config.worker_app is None:
+        if hs.config.run_background_tasks:
             self._clock.looping_call(
                 run_as_background_process,
                 5 * 60 * 1000,
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index b9d9098104..debb1b4f29 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Copyright 2016 OpenMarket Ltd
 # Copyright 2019 New Vector Ltd
-# Copyright 2019 The Matrix.org Foundation C.I.C.
+# Copyright 2019,2020 The Matrix.org Foundation C.I.C.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-from typing import Any, Dict, List, Optional
+from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Set, Tuple
 
 from synapse.api import errors
 from synapse.api.constants import EventTypes
@@ -29,7 +29,10 @@ from synapse.api.errors import (
 from synapse.logging.opentracing import log_kv, set_tag, trace
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.types import (
+    Collection,
+    JsonDict,
     StreamToken,
+    UserID,
     get_domain_from_id,
     get_verify_key_from_cross_signing_key,
 )
@@ -41,13 +44,16 @@ from synapse.util.retryutils import NotRetryingDestination
 
 from ._base import BaseHandler
 
+if TYPE_CHECKING:
+    from synapse.app.homeserver import HomeServer
+
 logger = logging.getLogger(__name__)
 
 MAX_DEVICE_DISPLAY_NAME_LEN = 100
 
 
 class DeviceWorkerHandler(BaseHandler):
-    def __init__(self, hs):
+    def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
         self.hs = hs
@@ -105,7 +111,9 @@ class DeviceWorkerHandler(BaseHandler):
 
     @trace
     @measure_func("device.get_user_ids_changed")
-    async def get_user_ids_changed(self, user_id: str, from_token: StreamToken):
+    async def get_user_ids_changed(
+        self, user_id: str, from_token: StreamToken
+    ) -> JsonDict:
         """Get list of users that have had the devices updated, or have newly
         joined a room, that `user_id` may be interested in.
         """
@@ -221,8 +229,8 @@ class DeviceWorkerHandler(BaseHandler):
             possibly_joined = possibly_changed & users_who_share_room
             possibly_left = (possibly_changed | possibly_left) - users_who_share_room
         else:
-            possibly_joined = []
-            possibly_left = []
+            possibly_joined = set()
+            possibly_left = set()
 
         result = {"changed": list(possibly_joined), "left": list(possibly_left)}
 
@@ -230,7 +238,7 @@ class DeviceWorkerHandler(BaseHandler):
 
         return result
 
-    async def on_federation_query_user_devices(self, user_id):
+    async def on_federation_query_user_devices(self, user_id: str) -> JsonDict:
         stream_id, devices = await self.store.get_e2e_device_keys_for_federation_query(
             user_id
         )
@@ -249,7 +257,7 @@ class DeviceWorkerHandler(BaseHandler):
 
 
 class DeviceHandler(DeviceWorkerHandler):
-    def __init__(self, hs):
+    def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
         self.federation_sender = hs.get_federation_sender()
@@ -264,7 +272,7 @@ class DeviceHandler(DeviceWorkerHandler):
 
         hs.get_distributor().observe("user_left_room", self.user_left_room)
 
-    def _check_device_name_length(self, name: str):
+    def _check_device_name_length(self, name: Optional[str]):
         """
         Checks whether a device name is longer than the maximum allowed length.
 
@@ -283,8 +291,11 @@ class DeviceHandler(DeviceWorkerHandler):
             )
 
     async def check_device_registered(
-        self, user_id, device_id, initial_device_display_name=None
-    ):
+        self,
+        user_id: str,
+        device_id: Optional[str],
+        initial_device_display_name: Optional[str] = None,
+    ) -> str:
         """
         If the given device has not been registered, register it with the
         supplied display name.
@@ -292,12 +303,11 @@ class DeviceHandler(DeviceWorkerHandler):
         If no device_id is supplied, we make one up.
 
         Args:
-            user_id (str):  @user:id
-            device_id (str | None): device id supplied by client
-            initial_device_display_name (str | None): device display name from
-                 client
+            user_id:  @user:id
+            device_id: device id supplied by client
+            initial_device_display_name: device display name from client
         Returns:
-            str: device id (generated if none was supplied)
+            device id (generated if none was supplied)
         """
 
         self._check_device_name_length(initial_device_display_name)
@@ -316,15 +326,15 @@ class DeviceHandler(DeviceWorkerHandler):
         # times in case of a clash.
         attempts = 0
         while attempts < 5:
-            device_id = stringutils.random_string(10).upper()
+            new_device_id = stringutils.random_string(10).upper()
             new_device = await self.store.store_device(
                 user_id=user_id,
-                device_id=device_id,
+                device_id=new_device_id,
                 initial_device_display_name=initial_device_display_name,
             )
             if new_device:
-                await self.notify_device_update(user_id, [device_id])
-                return device_id
+                await self.notify_device_update(user_id, [new_device_id])
+                return new_device_id
             attempts += 1
 
         raise errors.StoreError(500, "Couldn't generate a device ID.")
@@ -433,7 +443,9 @@ class DeviceHandler(DeviceWorkerHandler):
 
     @trace
     @measure_func("notify_device_update")
-    async def notify_device_update(self, user_id, device_ids):
+    async def notify_device_update(
+        self, user_id: str, device_ids: Collection[str]
+    ) -> None:
         """Notify that a user's device(s) has changed. Pokes the notifier, and
         remote servers if the user is local.
         """
@@ -445,7 +457,7 @@ class DeviceHandler(DeviceWorkerHandler):
             user_id
         )
 
-        hosts = set()
+        hosts = set()  # type: Set[str]
         if self.hs.is_mine_id(user_id):
             hosts.update(get_domain_from_id(u) for u in users_who_share_room)
             hosts.discard(self.server_name)
@@ -497,7 +509,7 @@ class DeviceHandler(DeviceWorkerHandler):
 
         self.notifier.on_new_event("device_list_key", position, users=[from_user_id])
 
-    async def user_left_room(self, user, room_id):
+    async def user_left_room(self, user: UserID, room_id: str) -> None:
         user_id = user.to_string()
         room_ids = await self.store.get_rooms_for_user(user_id)
         if not room_ids:
@@ -505,8 +517,89 @@ class DeviceHandler(DeviceWorkerHandler):
             # receive device updates. Mark this in DB.
             await self.store.mark_remote_user_device_list_as_unsubscribed(user_id)
 
+    async def store_dehydrated_device(
+        self,
+        user_id: str,
+        device_data: JsonDict,
+        initial_device_display_name: Optional[str] = None,
+    ) -> str:
+        """Store a dehydrated device for a user.  If the user had a previous
+        dehydrated device, it is removed.
+
+        Args:
+            user_id: the user that we are storing the device for
+            device_data: the dehydrated device information
+            initial_device_display_name: The display name to use for the device
+        Returns:
+            device id of the dehydrated device
+        """
+        device_id = await self.check_device_registered(
+            user_id, None, initial_device_display_name,
+        )
+        old_device_id = await self.store.store_dehydrated_device(
+            user_id, device_id, device_data
+        )
+        if old_device_id is not None:
+            await self.delete_device(user_id, old_device_id)
+        return device_id
+
+    async def get_dehydrated_device(
+        self, user_id: str
+    ) -> Optional[Tuple[str, JsonDict]]:
+        """Retrieve the information for a dehydrated device.
+
+        Args:
+            user_id: the user whose dehydrated device we are looking for
+        Returns:
+            a tuple whose first item is the device ID, and the second item is
+            the dehydrated device information
+        """
+        return await self.store.get_dehydrated_device(user_id)
+
+    async def rehydrate_device(
+        self, user_id: str, access_token: str, device_id: str
+    ) -> dict:
+        """Process a rehydration request from the user.
+
+        Args:
+            user_id: the user who is rehydrating the device
+            access_token: the access token used for the request
+            device_id: the ID of the device that will be rehydrated
+        Returns:
+            a dict containing {"success": True}
+        """
+        success = await self.store.remove_dehydrated_device(user_id, device_id)
+
+        if not success:
+            raise errors.NotFoundError()
+
+        # If the dehydrated device was successfully deleted (the device ID
+        # matched the stored dehydrated device), then modify the access
+        # token to use the dehydrated device's ID and copy the old device
+        # display name to the dehydrated device, and destroy the old device
+        # ID
+        old_device_id = await self.store.set_device_for_access_token(
+            access_token, device_id
+        )
+        old_device = await self.store.get_device(user_id, old_device_id)
+        await self.store.update_device(user_id, device_id, old_device["display_name"])
+        # can't call self.delete_device because that will clobber the
+        # access token so call the storage layer directly
+        await self.store.delete_device(user_id, old_device_id)
+        await self.store.delete_e2e_keys_by_device(
+            user_id=user_id, device_id=old_device_id
+        )
 
-def _update_device_from_client_ips(device, client_ips):
+        # tell everyone that the old device is gone and that the dehydrated
+        # device has a new display name
+        await self.notify_device_update(user_id, [old_device_id, device_id])
+
+        return {"success": True}
+
+
+def _update_device_from_client_ips(
+    device: Dict[str, Any], client_ips: Dict[Tuple[str, str], Dict[str, Any]]
+) -> None:
     ip = client_ips.get((device["user_id"], device["device_id"]), {})
     device.update({"last_seen_ts": ip.get("last_seen"), "last_seen_ip": ip.get("ip")})
 
@@ -514,7 +607,7 @@ def _update_device_from_client_ips(device, client_ips):
 class DeviceListUpdater:
     "Handles incoming device list updates from federation and updates the DB"
 
-    def __init__(self, hs, device_handler):
+    def __init__(self, hs: "HomeServer", device_handler: DeviceHandler):
         self.store = hs.get_datastore()
         self.federation = hs.get_federation_client()
         self.clock = hs.get_clock()
@@ -523,7 +616,9 @@ class DeviceListUpdater:
         self._remote_edu_linearizer = Linearizer(name="remote_device_list")
 
         # user_id -> list of updates waiting to be handled.
-        self._pending_updates = {}
+        self._pending_updates = (
+            {}
+        )  # type: Dict[str, List[Tuple[str, str, Iterable[str], JsonDict]]]
 
         # Recently seen stream ids. We don't bother keeping these in the DB,
         # but they're useful to have them about to reduce the number of spurious
@@ -546,7 +641,9 @@ class DeviceListUpdater:
         )
 
     @trace
-    async def incoming_device_list_update(self, origin, edu_content):
+    async def incoming_device_list_update(
+        self, origin: str, edu_content: JsonDict
+    ) -> None:
         """Called on incoming device list update from federation. Responsible
         for parsing the EDU and adding to pending updates list.
         """
@@ -607,7 +704,7 @@ class DeviceListUpdater:
         await self._handle_device_updates(user_id)
 
     @measure_func("_incoming_device_list_update")
-    async def _handle_device_updates(self, user_id):
+    async def _handle_device_updates(self, user_id: str) -> None:
         "Actually handle pending updates."
 
         with (await self._remote_edu_linearizer.queue(user_id)):
@@ -655,7 +752,9 @@ class DeviceListUpdater:
                     stream_id for _, stream_id, _, _ in pending_updates
                 )
 
-    async def _need_to_do_resync(self, user_id, updates):
+    async def _need_to_do_resync(
+        self, user_id: str, updates: Iterable[Tuple[str, str, Iterable[str], JsonDict]]
+    ) -> bool:
         """Given a list of updates for a user figure out if we need to do a full
         resync, or whether we have enough data that we can just apply the delta.
         """
@@ -686,7 +785,7 @@ class DeviceListUpdater:
         return False
 
     @trace
-    async def _maybe_retry_device_resync(self):
+    async def _maybe_retry_device_resync(self) -> None:
         """Retry to resync device lists that are out of sync, except if another retry is
         in progress.
         """
@@ -729,7 +828,7 @@ class DeviceListUpdater:
 
     async def user_device_resync(
         self, user_id: str, mark_failed_as_stale: bool = True
-    ) -> Optional[dict]:
+    ) -> Optional[JsonDict]:
         """Fetches all devices for a user and updates the device cache with them.
 
         Args:
@@ -753,7 +852,7 @@ class DeviceListUpdater:
                 # it later.
                 await self.store.mark_remote_user_device_cache_as_stale(user_id)
 
-            return
+            return None
         except (RequestSendFailed, HttpResponseException) as e:
             logger.warning(
                 "Failed to handle device list update for %s: %s", user_id, e,
@@ -770,12 +869,12 @@ class DeviceListUpdater:
             # next time we get a device list update for this user_id.
             # This makes it more likely that the device lists will
             # eventually become consistent.
-            return
+            return None
         except FederationDeniedError as e:
             set_tag("error", True)
             log_kv({"reason": "FederationDeniedError"})
             logger.info(e)
-            return
+            return None
         except Exception as e:
             set_tag("error", True)
             log_kv(
@@ -788,7 +887,7 @@ class DeviceListUpdater:
                 # it later.
                 await self.store.mark_remote_user_device_cache_as_stale(user_id)
 
-            return
+            return None
         log_kv({"result": result})
         stream_id = result["stream_id"]
         devices = result["devices"]
@@ -849,7 +948,7 @@ class DeviceListUpdater:
         user_id: str,
         master_key: Optional[Dict[str, Any]],
         self_signing_key: Optional[Dict[str, Any]],
-    ) -> list:
+    ) -> List[str]:
         """Process the given new master and self-signing key for the given remote user.
 
         Args:
diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 62aa9a2da8..ad5683d251 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -46,6 +46,7 @@ class DirectoryHandler(BaseHandler):
         self.config = hs.config
         self.enable_room_list_search = hs.config.enable_room_list_search
         self.require_membership = hs.config.require_membership_for_aliases
+        self.third_party_event_rules = hs.get_third_party_event_rules()
 
         self.federation = hs.get_federation_client()
         hs.get_federation_registry().register_query_handler(
@@ -383,7 +384,7 @@ class DirectoryHandler(BaseHandler):
         """
         creator = await self.store.get_room_alias_creator(alias.to_string())
 
-        if creator is not None and creator == user_id:
+        if creator == user_id:
             return True
 
         # Resolve the alias to the corresponding room.
@@ -454,6 +455,15 @@ class DirectoryHandler(BaseHandler):
                 # per alias creation rule?
                 raise SynapseError(403, "Not allowed to publish room")
 
+            # Check if publishing is blocked by a third party module
+            allowed_by_third_party_rules = await (
+                self.third_party_event_rules.check_visibility_can_be_modified(
+                    room_id, visibility
+                )
+            )
+            if not allowed_by_third_party_rules:
+                raise SynapseError(403, "Not allowed to publish room")
+
         await self.store.set_room_is_public(room_id, making_public)
 
     async def edit_published_appservice_room_list(
diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index dd40fd1299..611742ae72 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -496,6 +496,22 @@ class E2eKeysHandler:
             log_kv(
                 {"message": "Did not update one_time_keys", "reason": "no keys given"}
             )
+        fallback_keys = keys.get("org.matrix.msc2732.fallback_keys", None)
+        if fallback_keys and isinstance(fallback_keys, dict):
+            log_kv(
+                {
+                    "message": "Updating fallback_keys for device.",
+                    "user_id": user_id,
+                    "device_id": device_id,
+                }
+            )
+            await self.store.set_e2e_fallback_keys(user_id, device_id, fallback_keys)
+        elif fallback_keys:
+            log_kv({"message": "Did not update fallback_keys", "reason": "not a dict"})
+        else:
+            log_kv(
+                {"message": "Did not update fallback_keys", "reason": "no keys given"}
+            )
 
         # the device should have been registered already, but it may have been
         # deleted due to a race with a DELETE request. Or we may be using an
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 1a8144405a..5ac2fc5656 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -3008,6 +3008,9 @@ class FederationHandler(BaseHandler):
         elif event.internal_metadata.is_outlier():
             return
 
+        # the event has been persisted so it should have a stream ordering.
+        assert event.internal_metadata.stream_ordering
+
         event_pos = PersistedEventPosition(
             self._instance_name, event.internal_metadata.stream_ordering
         )
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index ee271e85e5..3e9a22e8f3 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -635,59 +635,6 @@ class EventCreationHandler:
         msg = self._block_events_without_consent_error % {"consent_uri": consent_uri}
         raise ConsentNotGivenError(msg=msg, consent_uri=consent_uri)
 
-    async def send_nonmember_event(
-        self,
-        requester: Requester,
-        event: EventBase,
-        context: EventContext,
-        ratelimit: bool = True,
-        ignore_shadow_ban: bool = False,
-    ) -> int:
-        """
-        Persists and notifies local clients and federation of an event.
-
-        Args:
-            requester: The requester sending the event.
-            event: The event to send.
-            context: The context of the event.
-            ratelimit: Whether to rate limit this send.
-            ignore_shadow_ban: True if shadow-banned users should be allowed to
-                send this event.
-
-        Return:
-            The stream_id of the persisted event.
-
-        Raises:
-            ShadowBanError if the requester has been shadow-banned.
-        """
-        if event.type == EventTypes.Member:
-            raise SynapseError(
-                500, "Tried to send member event through non-member codepath"
-            )
-
-        if not ignore_shadow_ban and requester.shadow_banned:
-            # We randomly sleep a bit just to annoy the requester.
-            await self.clock.sleep(random.randint(1, 10))
-            raise ShadowBanError()
-
-        user = UserID.from_string(event.sender)
-
-        assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
-
-        if event.is_state():
-            prev_event = await self.deduplicate_state_event(event, context)
-            if prev_event is not None:
-                logger.info(
-                    "Not bothering to persist state event %s duplicated by %s",
-                    event.event_id,
-                    prev_event.event_id,
-                )
-                return await self.store.get_stream_id_for_event(prev_event.event_id)
-
-        return await self.handle_new_client_event(
-            requester=requester, event=event, context=context, ratelimit=ratelimit
-        )
-
     async def deduplicate_state_event(
         self, event: EventBase, context: EventContext
     ) -> Optional[EventBase]:
@@ -728,7 +675,7 @@ class EventCreationHandler:
         """
         Creates an event, then sends it.
 
-        See self.create_event and self.send_nonmember_event.
+        See self.create_event and self.handle_new_client_event.
 
         Args:
             requester: The requester sending the event.
@@ -738,9 +685,19 @@ class EventCreationHandler:
             ignore_shadow_ban: True if shadow-banned users should be allowed to
                 send this event.
 
+        Returns:
+            The event, and its stream ordering (if state event deduplication happened,
+            the previous, duplicate event).
+
         Raises:
             ShadowBanError if the requester has been shadow-banned.
         """
+
+        if event_dict["type"] == EventTypes.Member:
+            raise SynapseError(
+                500, "Tried to send member event through non-member codepath"
+            )
+
         if not ignore_shadow_ban and requester.shadow_banned:
             # We randomly sleep a bit just to annoy the requester.
             await self.clock.sleep(random.randint(1, 10))
@@ -756,20 +713,27 @@ class EventCreationHandler:
                 requester, event_dict, token_id=requester.access_token_id, txn_id=txn_id
             )
 
+            assert self.hs.is_mine_id(event.sender), "User must be our own: %s" % (
+                event.sender,
+            )
+
             spam_error = self.spam_checker.check_event_for_spam(event)
             if spam_error:
                 if not isinstance(spam_error, str):
                     spam_error = "Spam is not permitted here"
                 raise SynapseError(403, spam_error, Codes.FORBIDDEN)
 
-            stream_id = await self.send_nonmember_event(
-                requester,
-                event,
-                context,
+            ev = await self.handle_new_client_event(
+                requester=requester,
+                event=event,
+                context=context,
                 ratelimit=ratelimit,
                 ignore_shadow_ban=ignore_shadow_ban,
             )
-        return event, stream_id
+
+        # we know it was persisted, so must have a stream ordering
+        assert ev.internal_metadata.stream_ordering
+        return ev, ev.internal_metadata.stream_ordering
 
     @measure_func("create_new_client_event")
     async def create_new_client_event(
@@ -843,8 +807,11 @@ class EventCreationHandler:
         context: EventContext,
         ratelimit: bool = True,
         extra_users: List[UserID] = [],
-    ) -> int:
-        """Processes a new event. This includes checking auth, persisting it,
+        ignore_shadow_ban: bool = False,
+    ) -> EventBase:
+        """Processes a new event.
+
+        This includes deduplicating, checking auth, persisting,
         notifying users, sending to remote servers, etc.
 
         If called from a worker will hit out to the master process for final
@@ -857,10 +824,39 @@ class EventCreationHandler:
             ratelimit
             extra_users: Any extra users to notify about event
 
+            ignore_shadow_ban: True if shadow-banned users should be allowed to
+                send this event.
+
         Return:
-            The stream_id of the persisted event.
+            If the event was deduplicated, the previous, duplicate, event. Otherwise,
+            `event`.
+
+        Raises:
+            ShadowBanError if the requester has been shadow-banned.
         """
 
+        # we don't apply shadow-banning to membership events here. Invites are blocked
+        # higher up the stack, and we allow shadow-banned users to send join and leave
+        # events as normal.
+        if (
+            event.type != EventTypes.Member
+            and not ignore_shadow_ban
+            and requester.shadow_banned
+        ):
+            # We randomly sleep a bit just to annoy the requester.
+            await self.clock.sleep(random.randint(1, 10))
+            raise ShadowBanError()
+
+        if event.is_state():
+            prev_event = await self.deduplicate_state_event(event, context)
+            if prev_event is not None:
+                logger.info(
+                    "Not bothering to persist state event %s duplicated by %s",
+                    event.event_id,
+                    prev_event.event_id,
+                )
+                return prev_event
+
         if event.is_state() and (event.type, event.state_key) == (
             EventTypes.Create,
             "",
@@ -915,13 +911,13 @@ class EventCreationHandler:
                 )
                 stream_id = result["stream_id"]
                 event.internal_metadata.stream_ordering = stream_id
-                return stream_id
+                return event
 
             stream_id = await self.persist_and_notify_client_event(
                 requester, event, context, ratelimit=ratelimit, extra_users=extra_users
             )
 
-            return stream_id
+            return event
         except Exception:
             # Ensure that we actually remove the entries in the push actions
             # staging area, if we calculated them.
@@ -1232,8 +1228,12 @@ class EventCreationHandler:
 
                 # Since this is a dummy-event it is OK if it is sent by a
                 # shadow-banned user.
-                await self.send_nonmember_event(
-                    requester, event, context, ratelimit=False, ignore_shadow_ban=True,
+                await self.handle_new_client_event(
+                    requester=requester,
+                    event=event,
+                    context=context,
+                    ratelimit=False,
+                    ignore_shadow_ban=True,
                 )
                 return True
             except ConsentNotGivenError:
diff --git a/synapse/handlers/oidc_handler.py b/synapse/handlers/oidc_handler.py
index 19cd652675..05ac86e697 100644
--- a/synapse/handlers/oidc_handler.py
+++ b/synapse/handlers/oidc_handler.py
@@ -96,6 +96,7 @@ class OidcHandler:
         self.hs = hs
         self._callback_url = hs.config.oidc_callback_url  # type: str
         self._scopes = hs.config.oidc_scopes  # type: List[str]
+        self._user_profile_method = hs.config.oidc_user_profile_method  # type: str
         self._client_auth = ClientAuth(
             hs.config.oidc_client_id,
             hs.config.oidc_client_secret,
@@ -196,11 +197,11 @@ class OidcHandler:
                     % (m["response_types_supported"],)
                 )
 
-        # If the openid scope was not requested, we need a userinfo endpoint to fetch user infos
+        # Ensure there's a userinfo endpoint to fetch from if it is required.
         if self._uses_userinfo:
             if m.get("userinfo_endpoint") is None:
                 raise ValueError(
-                    'provider has no "userinfo_endpoint", even though it is required because the "openid" scope is not requested'
+                    'provider has no "userinfo_endpoint", even though it is required'
                 )
         else:
             # If we're not using userinfo, we need a valid jwks to validate the ID token
@@ -220,8 +221,10 @@ class OidcHandler:
         ``access_token`` with the ``userinfo_endpoint``.
         """
 
-        # Maybe that should be user-configurable and not inferred?
-        return "openid" not in self._scopes
+        return (
+            "openid" not in self._scopes
+            or self._user_profile_method == "userinfo_endpoint"
+        )
 
     async def load_metadata(self) -> OpenIDProviderMetadata:
         """Load and validate the provider metadata.
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index d5f7c78edf..d0530a446c 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -185,6 +185,7 @@ class RoomCreationHandler(BaseHandler):
             ShadowBanError if the requester is shadow-banned.
         """
         user_id = requester.user.to_string()
+        assert self.hs.is_mine_id(user_id), "User must be our own: %s" % (user_id,)
 
         # start by allocating a new room id
         r = await self.store.get_room(old_room_id)
@@ -229,8 +230,8 @@ class RoomCreationHandler(BaseHandler):
         )
 
         # now send the tombstone
-        await self.event_creation_handler.send_nonmember_event(
-            requester, tombstone_event, tombstone_context
+        await self.event_creation_handler.handle_new_client_event(
+            requester=requester, event=tombstone_event, context=tombstone_context,
         )
 
         old_room_state = await tombstone_context.get_current_state_ids()
@@ -681,6 +682,15 @@ class RoomCreationHandler(BaseHandler):
             creator_id=user_id, is_public=is_public, room_version=room_version,
         )
 
+        # Check whether this visibility value is blocked by a third party module
+        allowed_by_third_party_rules = await (
+            self.third_party_event_rules.check_visibility_can_be_modified(
+                room_id, visibility
+            )
+        )
+        if not allowed_by_third_party_rules:
+            raise SynapseError(403, "Room visibility value not allowed.")
+
         directory_handler = self.hs.get_handlers().directory_handler
         if room_alias:
             await directory_handler.create_association(
@@ -962,8 +972,6 @@ class RoomCreationHandler(BaseHandler):
             try:
                 random_string = stringutils.random_string(18)
                 gen_room_id = RoomID(random_string, self.hs.hostname).to_string()
-                if isinstance(gen_room_id, bytes):
-                    gen_room_id = gen_room_id.decode("utf-8")
                 await self.store.store_room(
                     room_id=gen_room_id,
                     room_creator_user_id=creator_id,
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 8feba8c90a..fd8114a64d 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -22,7 +22,7 @@ from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple, Union
 from unpaddedbase64 import encode_base64
 
 from synapse import types
-from synapse.api.constants import MAX_DEPTH, EventTypes, Membership
+from synapse.api.constants import MAX_DEPTH, AccountDataTypes, EventTypes, Membership
 from synapse.api.errors import (
     AuthError,
     Codes,
@@ -188,15 +188,6 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
             require_consent=require_consent,
         )
 
-        # Check if this event matches the previous membership event for the user.
-        duplicate = await self.event_creation_handler.deduplicate_state_event(
-            event, context
-        )
-        if duplicate is not None:
-            # Discard the new event since this membership change is a no-op.
-            _, stream_id = await self.store.get_event_ordering(duplicate.event_id)
-            return duplicate.event_id, stream_id
-
         prev_state_ids = await context.get_prev_state_ids()
 
         prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None)
@@ -221,7 +212,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
                         retry_after_ms=int(1000 * (time_allowed - time_now_s))
                     )
 
-        stream_id = await self.event_creation_handler.handle_new_client_event(
+        result_event = await self.event_creation_handler.handle_new_client_event(
             requester, event, context, extra_users=[target], ratelimit=ratelimit,
         )
 
@@ -231,7 +222,9 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
                 if prev_member_event.membership == Membership.JOIN:
                     await self._user_left_room(target, room_id)
 
-        return event.event_id, stream_id
+        # we know it was persisted, so should have a stream ordering
+        assert result_event.internal_metadata.stream_ordering
+        return result_event.event_id, result_event.internal_metadata.stream_ordering
 
     async def copy_room_tags_and_direct_to_room(
         self, old_room_id, new_room_id, user_id
@@ -247,7 +240,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
         user_account_data, _ = await self.store.get_account_data_for_user(user_id)
 
         # Copy direct message state if applicable
-        direct_rooms = user_account_data.get("m.direct", {})
+        direct_rooms = user_account_data.get(AccountDataTypes.DIRECT, {})
 
         # Check which key this room is under
         if isinstance(direct_rooms, dict):
@@ -258,7 +251,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
 
                     # Save back to user's m.direct account data
                     await self.store.add_account_data_for_user(
-                        user_id, "m.direct", direct_rooms
+                        user_id, AccountDataTypes.DIRECT, direct_rooms
                     )
                     break
 
@@ -441,12 +434,12 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
                 same_membership = old_membership == effective_membership_state
                 same_sender = requester.user.to_string() == old_state.sender
                 if same_sender and same_membership and same_content:
-                    _, stream_id = await self.store.get_event_ordering(
-                        old_state.event_id
-                    )
+                    # duplicate event.
+                    # we know it was persisted, so must have a stream ordering.
+                    assert old_state.internal_metadata.stream_ordering
                     return (
                         old_state.event_id,
-                        stream_id,
+                        old_state.internal_metadata.stream_ordering,
                     )
 
             if old_membership in ["ban", "leave"] and action == "kick":
@@ -642,7 +635,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
 
     async def send_membership_event(
         self,
-        requester: Requester,
+        requester: Optional[Requester],
         event: EventBase,
         context: EventContext,
         ratelimit: bool = True,
@@ -672,12 +665,6 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
         else:
             requester = types.create_requester(target_user)
 
-        prev_event = await self.event_creation_handler.deduplicate_state_event(
-            event, context
-        )
-        if prev_event is not None:
-            return
-
         prev_state_ids = await context.get_prev_state_ids()
         if event.membership == Membership.JOIN:
             if requester.is_guest:
@@ -1185,10 +1172,13 @@ class RoomMemberMasterHandler(RoomMemberHandler):
 
         context = await self.state_handler.compute_event_context(event)
         context.app_service = requester.app_service
-        stream_id = await self.event_creation_handler.handle_new_client_event(
+        result_event = await self.event_creation_handler.handle_new_client_event(
             requester, event, context, extra_users=[UserID.from_string(target_user)],
         )
-        return event.event_id, stream_id
+        # we know it was persisted, so must have a stream ordering
+        assert result_event.internal_metadata.stream_ordering
+
+        return result_event.event_id, result_event.internal_metadata.stream_ordering
 
     async def _user_left_room(self, target: UserID, room_id: str) -> None:
         """Implements RoomMemberHandler._user_left_room
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index 249ffe2a55..dc62b21c06 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -49,7 +49,7 @@ class StatsHandler:
         # Guard to ensure we only process deltas one at a time
         self._is_processing = False
 
-        if hs.config.stats_enabled:
+        if self.stats_enabled and hs.config.run_background_tasks:
             self.notifier.add_replication_callback(self.notify_new_event)
 
             # We kick this off so that we don't have to wait for a change before
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index bfe2583002..6fb8332f93 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -21,7 +21,7 @@ from typing import TYPE_CHECKING, Any, Dict, FrozenSet, List, Optional, Set, Tup
 import attr
 from prometheus_client import Counter
 
-from synapse.api.constants import EventTypes, Membership
+from synapse.api.constants import AccountDataTypes, EventTypes, Membership
 from synapse.api.filtering import FilterCollection
 from synapse.events import EventBase
 from synapse.logging.context import current_context
@@ -87,7 +87,7 @@ class SyncConfig:
 class TimelineBatch:
     prev_batch = attr.ib(type=StreamToken)
     events = attr.ib(type=List[EventBase])
-    limited = attr.ib(bool)
+    limited = attr.ib(type=bool)
 
     def __bool__(self) -> bool:
         """Make the result appear empty if there are no updates. This is used
@@ -201,6 +201,8 @@ class SyncResult:
         device_lists: List of user_ids whose devices have changed
         device_one_time_keys_count: Dict of algorithm to count for one time keys
             for this device
+        device_unused_fallback_key_types: List of key types that have an unused fallback
+            key
         groups: Group updates, if any
     """
 
@@ -213,6 +215,7 @@ class SyncResult:
     to_device = attr.ib(type=List[JsonDict])
     device_lists = attr.ib(type=DeviceLists)
     device_one_time_keys_count = attr.ib(type=JsonDict)
+    device_unused_fallback_key_types = attr.ib(type=List[str])
     groups = attr.ib(type=Optional[GroupsSyncResult])
 
     def __bool__(self) -> bool:
@@ -457,8 +460,13 @@ class SyncHandler:
                 recents = []
 
             if not limited or block_all_timeline:
+                prev_batch_token = now_token
+                if recents:
+                    room_key = recents[0].internal_metadata.before
+                    prev_batch_token = now_token.copy_and_replace("room_key", room_key)
+
                 return TimelineBatch(
-                    events=recents, prev_batch=now_token, limited=False
+                    events=recents, prev_batch=prev_batch_token, limited=False
                 )
 
             filtering_factor = 2
@@ -1014,10 +1022,14 @@ class SyncHandler:
         logger.debug("Fetching OTK data")
         device_id = sync_config.device_id
         one_time_key_counts = {}  # type: JsonDict
+        unused_fallback_key_types = []  # type: List[str]
         if device_id:
             one_time_key_counts = await self.store.count_e2e_one_time_keys(
                 user_id, device_id
             )
+            unused_fallback_key_types = await self.store.get_e2e_unused_fallback_key_types(
+                user_id, device_id
+            )
 
         logger.debug("Fetching group data")
         await self._generate_sync_entry_for_groups(sync_result_builder)
@@ -1041,6 +1053,7 @@ class SyncHandler:
             device_lists=device_lists,
             groups=sync_result_builder.groups,
             device_one_time_keys_count=one_time_key_counts,
+            device_unused_fallback_key_types=unused_fallback_key_types,
             next_batch=sync_result_builder.now_token,
         )
 
@@ -1378,13 +1391,16 @@ class SyncHandler:
                         return set(), set(), set(), set()
 
         ignored_account_data = await self.store.get_global_account_data_by_type_for_user(
-            "m.ignored_user_list", user_id=user_id
+            AccountDataTypes.IGNORED_USER_LIST, user_id=user_id
         )
 
+        # If there is ignored users account data and it matches the proper type,
+        # then use it.
+        ignored_users = frozenset()  # type: FrozenSet[str]
         if ignored_account_data:
-            ignored_users = ignored_account_data.get("ignored_users", {}).keys()
-        else:
-            ignored_users = frozenset()
+            ignored_users_data = ignored_account_data.get("ignored_users", {})
+            if isinstance(ignored_users_data, dict):
+                ignored_users = frozenset(ignored_users_data.keys())
 
         if since_token:
             room_changes = await self._get_rooms_changed(
@@ -1478,7 +1494,7 @@ class SyncHandler:
         return False
 
     async def _get_rooms_changed(
-        self, sync_result_builder: "SyncResultBuilder", ignored_users: Set[str]
+        self, sync_result_builder: "SyncResultBuilder", ignored_users: FrozenSet[str]
     ) -> _RoomChanges:
         """Gets the the changes that have happened since the last sync.
         """
@@ -1690,7 +1706,7 @@ class SyncHandler:
         return _RoomChanges(room_entries, invited, newly_joined_rooms, newly_left_rooms)
 
     async def _get_all_rooms(
-        self, sync_result_builder: "SyncResultBuilder", ignored_users: Set[str]
+        self, sync_result_builder: "SyncResultBuilder", ignored_users: FrozenSet[str]
     ) -> _RoomChanges:
         """Returns entries for all rooms for the user.
 
@@ -1764,7 +1780,7 @@ class SyncHandler:
     async def _generate_room_entry(
         self,
         sync_result_builder: "SyncResultBuilder",
-        ignored_users: Set[str],
+        ignored_users: FrozenSet[str],
         room_builder: "RoomSyncResultBuilder",
         ephemeral: List[JsonDict],
         tags: Optional[Dict[str, Dict[str, Any]]],