def test_accept_consent(self):
"""
A user can use the consent form to accept the terms.
"""
uri_builder = ConsentURIBuilder(self.hs.config)
resource = consent_resource.ConsentResource(self.hs)
# Register a user
user_id = self.register_user("user", "pass")
access_token = self.login("user", "pass")
# Fetch the consent page, to get the consent version
consent_uri = (
uri_builder.build_user_consent_uri(user_id).replace("_matrix/", "")
+ "&u=user"
)
channel = make_request(
self.reactor,
FakeSite(resource, self.reactor),
"GET",
consent_uri,
access_token=access_token,
shorthand=False,
)
self.assertEqual(channel.code, 200)
# Get the version from the body, and whether we've consented
version, consented = channel.result["body"].decode("ascii").split(",")
self.assertEqual(consented, "False")
# POST to the consent page, saying we've agreed
channel = make_request(
self.reactor,
FakeSite(resource, self.reactor),
"POST",
consent_uri + "&v=" + version,
access_token=access_token,
shorthand=False,
)
self.assertEqual(channel.code, 200)
# Fetch the consent page, to get the consent version -- it should have
# changed
channel = make_request(
self.reactor,
FakeSite(resource, self.reactor),
"GET",
consent_uri,
access_token=access_token,
shorthand=False,
)
self.assertEqual(channel.code, 200)
# Get the version from the body, and check that it's the version we
# agreed to, and that we've consented to it.
version, consented = channel.result["body"].decode("ascii").split(",")
self.assertEqual(consented, "True")
self.assertEqual(version, "1")
def test_accept_consent(self):
"""
A user can use the consent form to accept the terms.
"""
uri_builder = ConsentURIBuilder(self.hs.config)
resource = consent_resource.ConsentResource(self.hs)
# Register a user
user_id = self.register_user("user", "pass")
access_token = self.login("user", "pass")
# Fetch the consent page, to get the consent version
consent_uri = (
uri_builder.build_user_consent_uri(user_id).replace("_matrix/", "")
+ "&u=user"
)
request, channel = self.make_request(
"GET", consent_uri, access_token=access_token, shorthand=False
)
render(request, resource, self.reactor)
self.assertEqual(channel.code, 200)
# Get the version from the body, and whether we've consented
version, consented = channel.result["body"].decode('ascii').split(",")
self.assertEqual(consented, "False")
# POST to the consent page, saying we've agreed
request, channel = self.make_request(
"POST",
consent_uri + "&v=" + version,
access_token=access_token,
shorthand=False,
)
render(request, resource, self.reactor)
self.assertEqual(channel.code, 200)
# Fetch the consent page, to get the consent version -- it should have
# changed
request, channel = self.make_request(
"GET", consent_uri, access_token=access_token, shorthand=False
)
render(request, resource, self.reactor)
self.assertEqual(channel.code, 200)
# Get the version from the body, and check that it's the version we
# agreed to, and that we've consented to it.
version, consented = channel.result["body"].decode('ascii').split(",")
self.assertEqual(consented, "True")
self.assertEqual(version, "1")
class ConsentServerNotices:
"""Keeps track of whether we need to send users server_notices about
privacy policy consent, and sends one if we do.
"""
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self._server_notices_manager = hs.get_server_notices_manager()
self._store = hs.get_datastore()
self._users_in_progress = set()
self._current_consent_version = hs.config.user_consent_version
self._server_notice_content = hs.config.user_consent_server_notice_content
self._send_to_guests = hs.config.user_consent_server_notice_to_guests
if self._server_notice_content is not None:
if not self._server_notices_manager.is_enabled():
raise ConfigError(
"user_consent configuration requires server notices, but "
"server notices are not enabled."
)
if "body" not in self._server_notice_content:
raise ConfigError(
"user_consent server_notice_consent must contain a 'body' key."
)
self._consent_uri_builder = ConsentURIBuilder(hs.config)
async def maybe_send_server_notice_to_user(self, user_id: str) -> None:
"""Check if we need to send a notice to this user, and does so if so
Args:
user_id: user to check
"""
if self._server_notice_content is None:
# not enabled
return
# make sure we don't send two messages to the same user at once
if user_id in self._users_in_progress:
return
self._users_in_progress.add(user_id)
try:
u = await self._store.get_user_by_id(user_id)
if u["is_guest"] and not self._send_to_guests:
# don't send to guests
return
if u["consent_version"] == self._current_consent_version:
# user has already consented
return
if u["consent_server_notice_sent"] == self._current_consent_version:
# we've already sent a notice to the user
return
# need to send a message.
try:
consent_uri = self._consent_uri_builder.build_user_consent_uri(
get_localpart_from_id(user_id)
)
content = copy_with_str_subst(
self._server_notice_content, {"consent_uri": consent_uri}
)
await self._server_notices_manager.send_notice(user_id, content)
await self._store.user_set_consent_server_notice_sent(
user_id, self._current_consent_version
)
except SynapseError as e:
logger.error("Error sending server notice about user consent: %s", e)
finally:
self._users_in_progress.remove(user_id)
class EventCreationHandler(object):
def __init__(self, hs):
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.clock = hs.get_clock()
self.validator = EventValidator()
self.profile_handler = hs.get_profile_handler()
self.event_builder_factory = hs.get_event_builder_factory()
self.server_name = hs.hostname
self.ratelimiter = hs.get_ratelimiter()
self.notifier = hs.get_notifier()
self.config = hs.config
self.send_event_to_master = ReplicationSendEventRestServlet.make_client(
hs)
# This is only used to get at ratelimit function, and maybe_kick_guest_users
self.base_handler = BaseHandler(hs)
self.pusher_pool = hs.get_pusherpool()
# We arbitrarily limit concurrent event creation for a room to 5.
# This is to stop us from diverging history *too* much.
self.limiter = Linearizer(max_count=5,
name="room_event_creation_limit")
self.action_generator = hs.get_action_generator()
self.spam_checker = hs.get_spam_checker()
if self.config.block_events_without_consent_error is not None:
self._consent_uri_builder = ConsentURIBuilder(self.config)
@defer.inlineCallbacks
def create_event(self,
requester,
event_dict,
token_id=None,
txn_id=None,
prev_events_and_hashes=None):
"""
Given a dict from a client, create a new event.
Creates an FrozenEvent object, filling out auth_events, prev_events,
etc.
Adds display names to Join membership events.
Args:
requester
event_dict (dict): An entire event
token_id (str)
txn_id (str)
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
Raises:
ResourceLimitError if server is blocked to some resource being
exceeded
Returns:
Tuple of created event (FrozenEvent), Context
"""
yield self.auth.check_auth_blocking(requester.user.to_string())
builder = self.event_builder_factory.new(event_dict)
self.validator.validate_new(builder)
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
target = UserID.from_string(builder.state_key)
if membership in {Membership.JOIN, Membership.INVITE}:
# If event doesn't include a display name, add one.
profile = self.profile_handler
content = builder.content
try:
if "displayname" not in content:
content["displayname"] = yield profile.get_displayname(
target)
if "avatar_url" not in content:
content["avatar_url"] = yield profile.get_avatar_url(
target)
except Exception as e:
logger.info("Failed to get profile information for %r: %s",
target, e)
is_exempt = yield self._is_exempt_from_privacy_policy(
builder, requester)
if not is_exempt:
yield self.assert_accepted_privacy_policy(requester)
if token_id is not None:
builder.internal_metadata.token_id = token_id
if txn_id is not None:
builder.internal_metadata.txn_id = txn_id
event, context = yield self.create_new_client_event(
builder=builder,
requester=requester,
prev_events_and_hashes=prev_events_and_hashes,
)
defer.returnValue((event, context))
def _is_exempt_from_privacy_policy(self, builder, requester):
""""Determine if an event to be sent is exempt from having to consent
to the privacy policy
Args:
builder (synapse.events.builder.EventBuilder): event being created
requester (Requster): user requesting this event
Returns:
Deferred[bool]: true if the event can be sent without the user
consenting
"""
# the only thing the user can do is join the server notices room.
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
if membership == Membership.JOIN:
return self._is_server_notices_room(builder.room_id)
elif membership == Membership.LEAVE:
# the user is always allowed to leave (but not kick people)
return builder.state_key == requester.user.to_string()
return succeed(False)
@defer.inlineCallbacks
def _is_server_notices_room(self, room_id):
if self.config.server_notices_mxid is None:
defer.returnValue(False)
user_ids = yield self.store.get_users_in_room(room_id)
defer.returnValue(self.config.server_notices_mxid in user_ids)
@defer.inlineCallbacks
def assert_accepted_privacy_policy(self, requester):
"""Check if a user has accepted the privacy policy
Called when the given user is about to do something that requires
privacy consent. We see if the user is exempt and otherwise check that
they have given consent. If they have not, a ConsentNotGiven error is
raised.
Args:
requester (synapse.types.Requester):
The user making the request
Returns:
Deferred[None]: returns normally if the user has consented or is
exempt
Raises:
ConsentNotGivenError: if the user has not given consent yet
"""
if self.config.block_events_without_consent_error is None:
return
# exempt AS users from needing consent
if requester.app_service is not None:
return
user_id = requester.user.to_string()
# exempt the system notices user
if (self.config.server_notices_mxid is not None
and user_id == self.config.server_notices_mxid):
return
u = yield self.store.get_user_by_id(user_id)
assert u is not None
if u["appservice_id"] is not None:
# users registered by an appservice are exempt
return
if u["consent_version"] == self.config.user_consent_version:
return
consent_uri = self._consent_uri_builder.build_user_consent_uri(
requester.user.localpart, )
msg = self.config.block_events_without_consent_error % {
'consent_uri': consent_uri,
}
raise ConsentNotGivenError(
msg=msg,
consent_uri=consent_uri,
)
@defer.inlineCallbacks
def send_nonmember_event(self, requester, event, context, ratelimit=True):
"""
Persists and notifies local clients and federation of an event.
Args:
event (FrozenEvent) the event to send.
context (Context) the context of the event.
ratelimit (bool): Whether to rate limit this send.
is_guest (bool): Whether the sender is a guest.
"""
if event.type == EventTypes.Member:
raise SynapseError(
500, "Tried to send member event through non-member codepath")
user = UserID.from_string(event.sender)
assert self.hs.is_mine(user), "User must be our own: %s" % (user, )
if event.is_state():
prev_state = yield self.deduplicate_state_event(event, context)
if prev_state is not None:
defer.returnValue(prev_state)
yield self.handle_new_client_event(
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
)
@defer.inlineCallbacks
def deduplicate_state_event(self, event, context):
"""
Checks whether event is in the latest resolved state in context.
If so, returns the version of the event in context.
Otherwise, returns None.
"""
prev_state_ids = yield context.get_prev_state_ids(self.store)
prev_event_id = prev_state_ids.get((event.type, event.state_key))
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event:
return
if prev_event and event.user_id == prev_event.user_id:
prev_content = encode_canonical_json(prev_event.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
defer.returnValue(prev_event)
return
@defer.inlineCallbacks
def create_and_send_nonmember_event(self,
requester,
event_dict,
ratelimit=True,
txn_id=None):
"""
Creates an event, then sends it.
See self.create_event and self.send_nonmember_event.
"""
# We limit the number of concurrent event sends in a room so that we
# don't fork the DAG too much. If we don't limit then we can end up in
# a situation where event persistence can't keep up, causing
# extremities to pile up, which in turn leads to state resolution
# taking longer.
with (yield self.limiter.queue(event_dict["room_id"])):
event, context = yield self.create_event(
requester,
event_dict,
token_id=requester.access_token_id,
txn_id=txn_id)
spam_error = self.spam_checker.check_event_for_spam(event)
if spam_error:
if not isinstance(spam_error, string_types):
spam_error = "Spam is not permitted here"
raise SynapseError(403, spam_error, Codes.FORBIDDEN)
yield self.send_nonmember_event(
requester,
event,
context,
ratelimit=ratelimit,
)
defer.returnValue(event)
@measure_func("create_new_client_event")
@defer.inlineCallbacks
def create_new_client_event(self,
builder,
requester=None,
prev_events_and_hashes=None):
"""Create a new event for a local client
Args:
builder (EventBuilder):
requester (synapse.types.Requester|None):
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
Returns:
Deferred[(synapse.events.EventBase, synapse.events.snapshot.EventContext)]
"""
if prev_events_and_hashes is not None:
assert len(prev_events_and_hashes) <= 10, \
"Attempting to create an event with %i prev_events" % (
len(prev_events_and_hashes),
)
else:
prev_events_and_hashes = \
yield self.store.get_prev_events_for_room(builder.room_id)
if prev_events_and_hashes:
depth = max([d for _, _, d in prev_events_and_hashes]) + 1
# we cap depth of generated events, to ensure that they are not
# rejected by other servers (and so that they can be persisted in
# the db)
depth = min(depth, MAX_DEPTH)
else:
depth = 1
prev_events = [(event_id, prev_hashes)
for event_id, prev_hashes, _ in prev_events_and_hashes]
builder.prev_events = prev_events
builder.depth = depth
context = yield self.state.compute_event_context(builder)
if requester:
context.app_service = requester.app_service
if builder.is_state():
builder.prev_state = yield self.store.add_event_hashes(
context.prev_state_events)
yield self.auth.add_auth_events(builder, context)
signing_key = self.hs.config.signing_key[0]
add_hashes_and_signatures(builder, self.server_name, signing_key)
event = builder.build()
logger.debug(
"Created event %s",
event.event_id,
)
defer.returnValue((
event,
context,
))
@measure_func("handle_new_client_event")
@defer.inlineCallbacks
def handle_new_client_event(
self,
requester,
event,
context,
ratelimit=True,
extra_users=[],
):
"""Processes a new event. This includes checking auth, persisting it,
notifying users, sending to remote servers, etc.
If called from a worker will hit out to the master process for final
processing.
Args:
requester (Requester)
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
extra_users (list(UserID)): Any extra users to notify about event
"""
try:
yield self.auth.check_from_context(event, context)
except AuthError as err:
logger.warn("Denying new event %r because %s", event, err)
raise err
# Ensure that we can round trip before trying to persist in db
try:
dump = frozendict_json_encoder.encode(event.content)
json.loads(dump)
except Exception:
logger.exception("Failed to encode content: %r", event.content)
raise
yield self.action_generator.handle_push_actions_for_event(
event, context)
try:
# If we're a worker we need to hit out to the master.
if self.config.worker_app:
yield self.send_event_to_master(
event_id=event.event_id,
store=self.store,
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
extra_users=extra_users,
)
return
yield self.persist_and_notify_client_event(
requester,
event,
context,
ratelimit=ratelimit,
extra_users=extra_users,
)
except: # noqa: E722, as we reraise the exception this is fine.
# Ensure that we actually remove the entries in the push actions
# staging area, if we calculated them.
tp, value, tb = sys.exc_info()
run_in_background(
self.store.remove_push_actions_from_staging,
event.event_id,
)
six.reraise(tp, value, tb)
@defer.inlineCallbacks
def persist_and_notify_client_event(
self,
requester,
event,
context,
ratelimit=True,
extra_users=[],
):
"""Called when we have fully built the event, have already
calculated the push actions for the event, and checked auth.
This should only be run on master.
"""
assert not self.config.worker_app
if ratelimit:
yield self.base_handler.ratelimit(requester)
yield self.base_handler.maybe_kick_guest_users(event, context)
if event.type == EventTypes.CanonicalAlias:
# Check the alias is acually valid (at this time at least)
room_alias_str = event.content.get("alias", None)
if room_alias_str:
room_alias = RoomAlias.from_string(room_alias_str)
directory_handler = self.hs.get_handlers().directory_handler
mapping = yield directory_handler.get_association(room_alias)
if mapping["room_id"] != event.room_id:
raise SynapseError(
400, "Room alias %s does not point to the room" %
(room_alias_str, ))
federation_handler = self.hs.get_handlers().federation_handler
if event.type == EventTypes.Member:
if event.content["membership"] == Membership.INVITE:
def is_inviter_member_event(e):
return (e.type == EventTypes.Member
and e.sender == event.sender)
current_state_ids = yield context.get_current_state_ids(
self.store)
state_to_include_ids = [
e_id for k, e_id in iteritems(current_state_ids)
if k[0] in self.hs.config.room_invite_state_types or k == (
EventTypes.Member, event.sender)
]
state_to_include = yield self.store.get_events(
state_to_include_ids)
event.unsigned["invite_room_state"] = [{
"type": e.type,
"state_key": e.state_key,
"content": e.content,
"sender": e.sender,
} for e in itervalues(state_to_include)]
invitee = UserID.from_string(event.state_key)
if not self.hs.is_mine(invitee):
# TODO: Can we add signature from remote server in a nicer
# way? If we have been invited by a remote server, we need
# to get them to sign the event.
returned_invite = yield federation_handler.send_invite(
invitee.domain,
event,
)
event.unsigned.pop("room_state", None)
# TODO: Make sure the signatures actually are correct.
event.signatures.update(returned_invite.signatures)
if event.type == EventTypes.Redaction:
prev_state_ids = yield context.get_prev_state_ids(self.store)
auth_events_ids = yield self.auth.compute_auth_events(
event,
prev_state_ids,
for_verification=True,
)
auth_events = yield self.store.get_events(auth_events_ids)
auth_events = {(e.type, e.state_key): e
for e in auth_events.values()}
if self.auth.check_redaction(event, auth_events=auth_events):
original_event = yield self.store.get_event(
event.redacts,
check_redacted=False,
get_prev_content=False,
allow_rejected=False,
allow_none=False)
if event.user_id != original_event.user_id:
raise AuthError(
403, "You don't have permission to redact events")
if event.type == EventTypes.Create:
prev_state_ids = yield context.get_prev_state_ids(self.store)
if prev_state_ids:
raise AuthError(
403,
"Changing the room create event is forbidden",
)
(event_stream_id,
max_stream_id) = yield self.store.persist_event(event,
context=context)
self.pusher_pool.on_new_notifications(
event_stream_id,
max_stream_id,
)
def _notify():
try:
self.notifier.on_new_room_event(event,
event_stream_id,
max_stream_id,
extra_users=extra_users)
except Exception:
logger.exception("Error notifying about new room event")
run_in_background(_notify)
if event.type == EventTypes.Message:
# We don't want to block sending messages on any presence code. This
# matters as sometimes presence code can take a while.
run_in_background(self._bump_active_time, requester.user)
@defer.inlineCallbacks
def _bump_active_time(self, user):
try:
presence = self.hs.get_presence_handler()
yield presence.bump_presence_active_time(user)
except Exception:
logger.exception("Error bumping presence active time")
class EventCreationHandler(object):
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.storage = hs.get_storage()
self.state = hs.get_state_handler()
self.clock = hs.get_clock()
self.validator = EventValidator()
self.profile_handler = hs.get_profile_handler()
self.event_builder_factory = hs.get_event_builder_factory()
self.server_name = hs.hostname
self.notifier = hs.get_notifier()
self.config = hs.config
self.require_membership_for_aliases = hs.config.require_membership_for_aliases
self._is_event_writer = (
self.config.worker.writers.events == hs.get_instance_name())
self.room_invite_state_types = self.hs.config.room_invite_state_types
self.send_event = ReplicationSendEventRestServlet.make_client(hs)
# This is only used to get at ratelimit function, and maybe_kick_guest_users
self.base_handler = BaseHandler(hs)
self.pusher_pool = hs.get_pusherpool()
# We arbitrarily limit concurrent event creation for a room to 5.
# This is to stop us from diverging history *too* much.
self.limiter = Linearizer(max_count=5,
name="room_event_creation_limit")
self.action_generator = hs.get_action_generator()
self.spam_checker = hs.get_spam_checker()
self.third_party_event_rules = hs.get_third_party_event_rules()
self._block_events_without_consent_error = (
self.config.block_events_without_consent_error)
# Rooms which should be excluded from dummy insertion. (For instance,
# those without local users who can send events into the room).
#
# map from room id to time-of-last-attempt.
#
self._rooms_to_exclude_from_dummy_event_insertion = {
} # type: dict[str, int]
# we need to construct a ConsentURIBuilder here, as it checks that the necessary
# config options, but *only* if we have a configuration for which we are
# going to need it.
if self._block_events_without_consent_error:
self._consent_uri_builder = ConsentURIBuilder(self.config)
if (not self.config.worker_app
and self.config.cleanup_extremities_with_dummy_events):
self.clock.looping_call(
lambda: run_as_background_process(
"send_dummy_events_to_fill_extremities",
self._send_dummy_events_to_fill_extremities,
),
5 * 60 * 1000,
)
self._message_handler = hs.get_message_handler()
self._ephemeral_events_enabled = hs.config.enable_ephemeral_messages
self._dummy_events_threshold = hs.config.dummy_events_threshold
@defer.inlineCallbacks
def create_event(
self,
requester,
event_dict,
token_id=None,
txn_id=None,
prev_event_ids: Optional[Collection[str]] = None,
require_consent=True,
):
"""
Given a dict from a client, create a new event.
Creates an FrozenEvent object, filling out auth_events, prev_events,
etc.
Adds display names to Join membership events.
Args:
requester
event_dict (dict): An entire event
token_id (str)
txn_id (str)
prev_event_ids:
the forward extremities to use as the prev_events for the
new event.
If None, they will be requested from the database.
require_consent (bool): Whether to check if the requester has
consented to privacy policy.
Raises:
ResourceLimitError if server is blocked to some resource being
exceeded
Returns:
Tuple of created event (FrozenEvent), Context
"""
yield self.auth.check_auth_blocking(requester.user.to_string())
if event_dict["type"] == EventTypes.Create and event_dict[
"state_key"] == "":
room_version = event_dict["content"]["room_version"]
else:
try:
room_version = yield self.store.get_room_version_id(
event_dict["room_id"])
except NotFoundError:
raise AuthError(403, "Unknown room")
builder = self.event_builder_factory.new(room_version, event_dict)
self.validator.validate_builder(builder)
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
target = UserID.from_string(builder.state_key)
if membership in {Membership.JOIN, Membership.INVITE}:
# If event doesn't include a display name, add one.
profile = self.profile_handler
content = builder.content
try:
if "displayname" not in content:
displayname = yield profile.get_displayname(target)
if displayname is not None:
content["displayname"] = displayname
if "avatar_url" not in content:
avatar_url = yield profile.get_avatar_url(target)
if avatar_url is not None:
content["avatar_url"] = avatar_url
except Exception as e:
logger.info("Failed to get profile information for %r: %s",
target, e)
is_exempt = yield self._is_exempt_from_privacy_policy(
builder, requester)
if require_consent and not is_exempt:
yield self.assert_accepted_privacy_policy(requester)
if token_id is not None:
builder.internal_metadata.token_id = token_id
if txn_id is not None:
builder.internal_metadata.txn_id = txn_id
event, context = yield self.create_new_client_event(
builder=builder,
requester=requester,
prev_event_ids=prev_event_ids,
)
# In an ideal world we wouldn't need the second part of this condition. However,
# this behaviour isn't spec'd yet, meaning we should be able to deactivate this
# behaviour. Another reason is that this code is also evaluated each time a new
# m.room.aliases event is created, which includes hitting a /directory route.
# Therefore not including this condition here would render the similar one in
# synapse.handlers.directory pointless.
if builder.type == EventTypes.Aliases and self.require_membership_for_aliases:
# Ideally we'd do the membership check in event_auth.check(), which
# describes a spec'd algorithm for authenticating events received over
# federation as well as those created locally. As of room v3, aliases events
# can be created by users that are not in the room, therefore we have to
# tolerate them in event_auth.check().
prev_state_ids = yield context.get_prev_state_ids()
prev_event_id = prev_state_ids.get(
(EventTypes.Member, event.sender))
prev_event = (yield self.store.get_event(
prev_event_id, allow_none=True) if prev_event_id else None)
if not prev_event or prev_event.membership != Membership.JOIN:
logger.warning(
("Attempt to send `m.room.aliases` in room %s by user %s but"
" membership is %s"),
event.room_id,
event.sender,
prev_event.membership if prev_event else None,
)
raise AuthError(
403, "You must be in the room to create an alias for it")
self.validator.validate_new(event, self.config)
return (event, context)
def _is_exempt_from_privacy_policy(self, builder, requester):
""""Determine if an event to be sent is exempt from having to consent
to the privacy policy
Args:
builder (synapse.events.builder.EventBuilder): event being created
requester (Requster): user requesting this event
Returns:
Deferred[bool]: true if the event can be sent without the user
consenting
"""
# the only thing the user can do is join the server notices room.
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
if membership == Membership.JOIN:
return self._is_server_notices_room(builder.room_id)
elif membership == Membership.LEAVE:
# the user is always allowed to leave (but not kick people)
return builder.state_key == requester.user.to_string()
return succeed(False)
@defer.inlineCallbacks
def _is_server_notices_room(self, room_id):
if self.config.server_notices_mxid is None:
return False
user_ids = yield self.store.get_users_in_room(room_id)
return self.config.server_notices_mxid in user_ids
@defer.inlineCallbacks
def assert_accepted_privacy_policy(self, requester):
"""Check if a user has accepted the privacy policy
Called when the given user is about to do something that requires
privacy consent. We see if the user is exempt and otherwise check that
they have given consent. If they have not, a ConsentNotGiven error is
raised.
Args:
requester (synapse.types.Requester):
The user making the request
Returns:
Deferred[None]: returns normally if the user has consented or is
exempt
Raises:
ConsentNotGivenError: if the user has not given consent yet
"""
if self._block_events_without_consent_error is None:
return
# exempt AS users from needing consent
if requester.app_service is not None:
return
user_id = requester.user.to_string()
# exempt the system notices user
if (self.config.server_notices_mxid is not None
and user_id == self.config.server_notices_mxid):
return
u = yield self.store.get_user_by_id(user_id)
assert u is not None
if u["user_type"] in (UserTypes.SUPPORT, UserTypes.BOT):
# support and bot users are not required to consent
return
if u["appservice_id"] is not None:
# users registered by an appservice are exempt
return
if u["consent_version"] == self.config.user_consent_version:
return
consent_uri = self._consent_uri_builder.build_user_consent_uri(
requester.user.localpart)
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,
event,
context,
ratelimit=True) -> int:
"""
Persists and notifies local clients and federation of an event.
Args:
event (FrozenEvent) the event to send.
context (Context) the context of the event.
ratelimit (bool): Whether to rate limit this send.
is_guest (bool): Whether the sender is a guest.
Return:
The stream_id of the persisted event.
"""
if event.type == EventTypes.Member:
raise SynapseError(
500, "Tried to send member event through non-member codepath")
user = UserID.from_string(event.sender)
assert self.hs.is_mine(user), "User must be our own: %s" % (user, )
if event.is_state():
prev_state = await self.deduplicate_state_event(event, context)
if prev_state is not None:
logger.info(
"Not bothering to persist state event %s duplicated by %s",
event.event_id,
prev_state.event_id,
)
return prev_state
return await self.handle_new_client_event(requester=requester,
event=event,
context=context,
ratelimit=ratelimit)
@defer.inlineCallbacks
def deduplicate_state_event(self, event, context):
"""
Checks whether event is in the latest resolved state in context.
If so, returns the version of the event in context.
Otherwise, returns None.
"""
prev_state_ids = yield context.get_prev_state_ids()
prev_event_id = prev_state_ids.get((event.type, event.state_key))
if not prev_event_id:
return
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event:
return
if prev_event and event.user_id == prev_event.user_id:
prev_content = encode_canonical_json(prev_event.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
return prev_event
return
async def create_and_send_nonmember_event(self,
requester,
event_dict,
ratelimit=True,
txn_id=None
) -> Tuple[EventBase, int]:
"""
Creates an event, then sends it.
See self.create_event and self.send_nonmember_event.
"""
# We limit the number of concurrent event sends in a room so that we
# don't fork the DAG too much. If we don't limit then we can end up in
# a situation where event persistence can't keep up, causing
# extremities to pile up, which in turn leads to state resolution
# taking longer.
with (await self.limiter.queue(event_dict["room_id"])):
event, context = await self.create_event(
requester,
event_dict,
token_id=requester.access_token_id,
txn_id=txn_id)
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,
ratelimit=ratelimit)
return event, stream_id
@measure_func("create_new_client_event")
@defer.inlineCallbacks
def create_new_client_event(
self,
builder,
requester=None,
prev_event_ids: Optional[Collection[str]] = None):
"""Create a new event for a local client
Args:
builder (EventBuilder):
requester (synapse.types.Requester|None):
prev_event_ids:
the forward extremities to use as the prev_events for the
new event.
If None, they will be requested from the database.
Returns:
Deferred[(synapse.events.EventBase, synapse.events.snapshot.EventContext)]
"""
if prev_event_ids is not None:
assert len(prev_event_ids) <= 10, (
"Attempting to create an event with %i prev_events" %
(len(prev_event_ids), ))
else:
prev_event_ids = yield self.store.get_prev_events_for_room(
builder.room_id)
event = yield builder.build(prev_event_ids=prev_event_ids)
context = yield self.state.compute_event_context(event)
if requester:
context.app_service = requester.app_service
self.validator.validate_new(event, self.config)
# If this event is an annotation then we check that that the sender
# can't annotate the same way twice (e.g. stops users from liking an
# event multiple times).
relation = event.content.get("m.relates_to", {})
if relation.get("rel_type") == RelationTypes.ANNOTATION:
relates_to = relation["event_id"]
aggregation_key = relation["key"]
already_exists = yield self.store.has_user_annotated_event(
relates_to, event.type, aggregation_key, event.sender)
if already_exists:
raise SynapseError(400, "Can't send same reaction twice")
logger.debug("Created event %s", event.event_id)
return (event, context)
@measure_func("handle_new_client_event")
async def handle_new_client_event(self,
requester,
event,
context,
ratelimit=True,
extra_users=[]) -> int:
"""Processes a new event. This includes checking auth, persisting it,
notifying users, sending to remote servers, etc.
If called from a worker will hit out to the master process for final
processing.
Args:
requester (Requester)
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
extra_users (list(UserID)): Any extra users to notify about event
Return:
The stream_id of the persisted event.
"""
if event.is_state() and (event.type, event.state_key) == (
EventTypes.Create,
"",
):
room_version = event.content.get("room_version",
RoomVersions.V1.identifier)
else:
room_version = await self.store.get_room_version_id(event.room_id)
event_allowed = await self.third_party_event_rules.check_event_allowed(
event, context)
if not event_allowed:
raise SynapseError(403,
"This event is not allowed in this context",
Codes.FORBIDDEN)
if event.internal_metadata.is_out_of_band_membership():
# the only sort of out-of-band-membership events we expect to see here
# are invite rejections we have generated ourselves.
assert event.type == EventTypes.Member
assert event.content["membership"] == Membership.LEAVE
else:
try:
await self.auth.check_from_context(room_version, event,
context)
except AuthError as err:
logger.warning("Denying new event %r because %s", event, err)
raise err
# Ensure that we can round trip before trying to persist in db
try:
dump = frozendict_json_encoder.encode(event.content)
json.loads(dump)
except Exception:
logger.exception("Failed to encode content: %r", event.content)
raise
await self.action_generator.handle_push_actions_for_event(
event, context)
# reraise does not allow inlineCallbacks to preserve the stacktrace, so we
# hack around with a try/finally instead.
success = False
try:
# If we're a worker we need to hit out to the master.
if not self._is_event_writer:
result = await self.send_event(
instance_name=self.config.worker.writers.events,
event_id=event.event_id,
store=self.store,
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
extra_users=extra_users,
)
stream_id = result["stream_id"]
event.internal_metadata.stream_ordering = stream_id
success = True
return stream_id
stream_id = await self.persist_and_notify_client_event(
requester,
event,
context,
ratelimit=ratelimit,
extra_users=extra_users)
success = True
return stream_id
finally:
if not success:
# Ensure that we actually remove the entries in the push actions
# staging area, if we calculated them.
run_in_background(self.store.remove_push_actions_from_staging,
event.event_id)
@defer.inlineCallbacks
def _validate_canonical_alias(self, directory_handler, room_alias_str,
expected_room_id):
"""
Ensure that the given room alias points to the expected room ID.
Args:
directory_handler: The directory handler object.
room_alias_str: The room alias to check.
expected_room_id: The room ID that the alias should point to.
"""
room_alias = RoomAlias.from_string(room_alias_str)
try:
mapping = yield defer.ensureDeferred(
directory_handler.get_association(room_alias))
except SynapseError as e:
# Turn M_NOT_FOUND errors into M_BAD_ALIAS errors.
if e.errcode == Codes.NOT_FOUND:
raise SynapseError(
400,
"Room alias %s does not point to the room" %
(room_alias_str, ),
Codes.BAD_ALIAS,
)
raise
if mapping["room_id"] != expected_room_id:
raise SynapseError(
400,
"Room alias %s does not point to the room" %
(room_alias_str, ),
Codes.BAD_ALIAS,
)
async def persist_and_notify_client_event(self,
requester,
event,
context,
ratelimit=True,
extra_users=[]) -> int:
"""Called when we have fully built the event, have already
calculated the push actions for the event, and checked auth.
This should only be run on the instance in charge of persisting events.
"""
assert self._is_event_writer
if ratelimit:
# We check if this is a room admin redacting an event so that we
# can apply different ratelimiting. We do this by simply checking
# it's not a self-redaction (to avoid having to look up whether the
# user is actually admin or not).
is_admin_redaction = False
if event.type == EventTypes.Redaction:
original_event = await self.store.get_event(
event.redacts,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
allow_rejected=False,
allow_none=True,
)
is_admin_redaction = (original_event and
event.sender != original_event.sender)
await self.base_handler.ratelimit(
requester, is_admin_redaction=is_admin_redaction)
await self.base_handler.maybe_kick_guest_users(event, context)
if event.type == EventTypes.CanonicalAlias:
# Validate a newly added alias or newly added alt_aliases.
original_alias = None
original_alt_aliases = set()
original_event_id = event.unsigned.get("replaces_state")
if original_event_id:
original_event = await self.store.get_event(original_event_id)
if original_event:
original_alias = original_event.content.get("alias", None)
original_alt_aliases = original_event.content.get(
"alt_aliases", [])
# Check the alias is currently valid (if it has changed).
room_alias_str = event.content.get("alias", None)
directory_handler = self.hs.get_handlers().directory_handler
if room_alias_str and room_alias_str != original_alias:
await self._validate_canonical_alias(directory_handler,
room_alias_str,
event.room_id)
# Check that alt_aliases is the proper form.
alt_aliases = event.content.get("alt_aliases", [])
if not isinstance(alt_aliases, (list, tuple)):
raise SynapseError(400,
"The alt_aliases property must be a list.",
Codes.INVALID_PARAM)
# If the old version of alt_aliases is of an unknown form,
# completely replace it.
if not isinstance(original_alt_aliases, (list, tuple)):
original_alt_aliases = []
# Check that each alias is currently valid.
new_alt_aliases = set(alt_aliases) - set(original_alt_aliases)
if new_alt_aliases:
for alias_str in new_alt_aliases:
await self._validate_canonical_alias(
directory_handler, alias_str, event.room_id)
federation_handler = self.hs.get_handlers().federation_handler
if event.type == EventTypes.Member:
if event.content["membership"] == Membership.INVITE:
def is_inviter_member_event(e):
return e.type == EventTypes.Member and e.sender == event.sender
current_state_ids = await context.get_current_state_ids()
state_to_include_ids = [
e_id for k, e_id in current_state_ids.items()
if k[0] in self.room_invite_state_types or k == (
EventTypes.Member, event.sender)
]
state_to_include = await self.store.get_events(
state_to_include_ids)
event.unsigned["invite_room_state"] = [{
"type": e.type,
"state_key": e.state_key,
"content": e.content,
"sender": e.sender,
} for e in state_to_include.values()]
invitee = UserID.from_string(event.state_key)
if not self.hs.is_mine(invitee):
# TODO: Can we add signature from remote server in a nicer
# way? If we have been invited by a remote server, we need
# to get them to sign the event.
returned_invite = await federation_handler.send_invite(
invitee.domain, event)
event.unsigned.pop("room_state", None)
# TODO: Make sure the signatures actually are correct.
event.signatures.update(returned_invite.signatures)
if event.type == EventTypes.Redaction:
original_event = await self.store.get_event(
event.redacts,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
allow_rejected=False,
allow_none=True,
)
# we can make some additional checks now if we have the original event.
if original_event:
if original_event.type == EventTypes.Create:
raise AuthError(
403, "Redacting create events is not permitted")
if original_event.room_id != event.room_id:
raise SynapseError(
400, "Cannot redact event from a different room")
prev_state_ids = await context.get_prev_state_ids()
auth_events_ids = await self.auth.compute_auth_events(
event, prev_state_ids, for_verification=True)
auth_events = await self.store.get_events(auth_events_ids)
auth_events = {(e.type, e.state_key): e
for e in auth_events.values()}
room_version = await self.store.get_room_version_id(event.room_id)
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
if event_auth.check_redaction(room_version_obj,
event,
auth_events=auth_events):
# this user doesn't have 'redact' rights, so we need to do some more
# checks on the original event. Let's start by checking the original
# event exists.
if not original_event:
raise NotFoundError("Could not find event %s" %
(event.redacts, ))
if event.user_id != original_event.user_id:
raise AuthError(
403, "You don't have permission to redact events")
# all the checks are done.
event.internal_metadata.recheck_redaction = False
if event.type == EventTypes.Create:
prev_state_ids = await context.get_prev_state_ids()
if prev_state_ids:
raise AuthError(403,
"Changing the room create event is forbidden")
event_stream_id, max_stream_id = await self.storage.persistence.persist_event(
event, context=context)
if self._ephemeral_events_enabled:
# If there's an expiry timestamp on the event, schedule its expiry.
self._message_handler.maybe_schedule_expiry(event)
await self.pusher_pool.on_new_notifications(event_stream_id,
max_stream_id)
def _notify():
try:
self.notifier.on_new_room_event(event,
event_stream_id,
max_stream_id,
extra_users=extra_users)
except Exception:
logger.exception("Error notifying about new room event")
run_in_background(_notify)
if event.type == EventTypes.Message:
# We don't want to block sending messages on any presence code. This
# matters as sometimes presence code can take a while.
run_in_background(self._bump_active_time, requester.user)
return event_stream_id
async def _bump_active_time(self, user):
try:
presence = self.hs.get_presence_handler()
await presence.bump_presence_active_time(user)
except Exception:
logger.exception("Error bumping presence active time")
async def _send_dummy_events_to_fill_extremities(self):
"""Background task to send dummy events into rooms that have a large
number of extremities
"""
self._expire_rooms_to_exclude_from_dummy_event_insertion()
room_ids = await self.store.get_rooms_with_many_extremities(
min_count=self._dummy_events_threshold,
limit=5,
room_id_filter=self._rooms_to_exclude_from_dummy_event_insertion.
keys(),
)
for room_id in room_ids:
# For each room we need to find a joined member we can use to send
# the dummy event with.
latest_event_ids = await self.store.get_prev_events_for_room(
room_id)
members = await self.state.get_current_users_in_room(
room_id, latest_event_ids=latest_event_ids)
dummy_event_sent = False
for user_id in members:
if not self.hs.is_mine_id(user_id):
continue
requester = create_requester(user_id)
try:
event, context = await self.create_event(
requester,
{
"type": "org.matrix.dummy_event",
"content": {},
"room_id": room_id,
"sender": user_id,
},
prev_event_ids=latest_event_ids,
)
event.internal_metadata.proactively_send = False
await self.send_nonmember_event(requester,
event,
context,
ratelimit=False)
dummy_event_sent = True
break
except ConsentNotGivenError:
logger.info(
"Failed to send dummy event into room %s for user %s due to "
"lack of consent. Will try another user" %
(room_id, user_id))
except AuthError:
logger.info(
"Failed to send dummy event into room %s for user %s due to "
"lack of power. Will try another user" %
(room_id, user_id))
if not dummy_event_sent:
# Did not find a valid user in the room, so remove from future attempts
# Exclusion is time limited, so the room will be rechecked in the future
# dependent on _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
logger.info(
"Failed to send dummy event into room %s. Will exclude it from "
"future attempts until cache expires" % (room_id, ))
now = self.clock.time_msec()
self._rooms_to_exclude_from_dummy_event_insertion[
room_id] = now
def _expire_rooms_to_exclude_from_dummy_event_insertion(self):
expire_before = self.clock.time_msec(
) - _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
to_expire = set()
for room_id, time in self._rooms_to_exclude_from_dummy_event_insertion.items(
):
if time < expire_before:
to_expire.add(room_id)
for room_id in to_expire:
logger.debug(
"Expiring room id %s from dummy event insertion exclusion cache",
room_id,
)
del self._rooms_to_exclude_from_dummy_event_insertion[room_id]
class ConsentServerNotices(object):
"""Keeps track of whether we need to send users server_notices about
privacy policy consent, and sends one if we do.
"""
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self._server_notices_manager = hs.get_server_notices_manager()
self._store = hs.get_datastore()
self._users_in_progress = set()
self._current_consent_version = hs.config.user_consent_version
self._server_notice_content = hs.config.user_consent_server_notice_content
self._send_to_guests = hs.config.user_consent_server_notice_to_guests
if self._server_notice_content is not None:
if not self._server_notices_manager.is_enabled():
raise ConfigError(
"user_consent configuration requires server notices, but "
"server notices are not enabled.",
)
if 'body' not in self._server_notice_content:
raise ConfigError(
"user_consent server_notice_consent must contain a 'body' "
"key.",
)
self._consent_uri_builder = ConsentURIBuilder(hs.config)
@defer.inlineCallbacks
def maybe_send_server_notice_to_user(self, user_id):
"""Check if we need to send a notice to this user, and does so if so
Args:
user_id (str): user to check
Returns:
Deferred
"""
if self._server_notice_content is None:
# not enabled
return
# make sure we don't send two messages to the same user at once
if user_id in self._users_in_progress:
return
self._users_in_progress.add(user_id)
try:
u = yield self._store.get_user_by_id(user_id)
if u["is_guest"] and not self._send_to_guests:
# don't send to guests
return
if u["consent_version"] == self._current_consent_version:
# user has already consented
return
if u["consent_server_notice_sent"] == self._current_consent_version:
# we've already sent a notice to the user
return
# need to send a message.
try:
consent_uri = self._consent_uri_builder.build_user_consent_uri(
get_localpart_from_id(user_id),
)
content = copy_with_str_subst(
self._server_notice_content, {
'consent_uri': consent_uri,
},
)
yield self._server_notices_manager.send_notice(
user_id, content,
)
yield self._store.user_set_consent_server_notice_sent(
user_id, self._current_consent_version,
)
except SynapseError as e:
logger.error("Error sending server notice about user consent: %s", e)
finally:
self._users_in_progress.remove(user_id)
class EventCreationHandler(object):
def __init__(self, hs):
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.clock = hs.get_clock()
self.validator = EventValidator()
self.profile_handler = hs.get_profile_handler()
self.event_builder_factory = hs.get_event_builder_factory()
self.server_name = hs.hostname
self.ratelimiter = hs.get_ratelimiter()
self.notifier = hs.get_notifier()
self.config = hs.config
self.require_membership_for_aliases = hs.config.require_membership_for_aliases
self.send_event_to_master = ReplicationSendEventRestServlet.make_client(hs)
# This is only used to get at ratelimit function, and maybe_kick_guest_users
self.base_handler = BaseHandler(hs)
self.pusher_pool = hs.get_pusherpool()
# We arbitrarily limit concurrent event creation for a room to 5.
# This is to stop us from diverging history *too* much.
self.limiter = Linearizer(max_count=5, name="room_event_creation_limit")
self.action_generator = hs.get_action_generator()
self.spam_checker = hs.get_spam_checker()
self._block_events_without_consent_error = (
self.config.block_events_without_consent_error
)
# we need to construct a ConsentURIBuilder here, as it checks that the necessary
# config options, but *only* if we have a configuration for which we are
# going to need it.
if self._block_events_without_consent_error:
self._consent_uri_builder = ConsentURIBuilder(self.config)
@defer.inlineCallbacks
def create_event(self, requester, event_dict, token_id=None, txn_id=None,
prev_events_and_hashes=None, require_consent=True):
"""
Given a dict from a client, create a new event.
Creates an FrozenEvent object, filling out auth_events, prev_events,
etc.
Adds display names to Join membership events.
Args:
requester
event_dict (dict): An entire event
token_id (str)
txn_id (str)
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
require_consent (bool): Whether to check if the requester has
consented to privacy policy.
Raises:
ResourceLimitError if server is blocked to some resource being
exceeded
Returns:
Tuple of created event (FrozenEvent), Context
"""
yield self.auth.check_auth_blocking(requester.user.to_string())
if event_dict["type"] == EventTypes.Create and event_dict["state_key"] == "":
room_version = event_dict["content"]["room_version"]
else:
try:
room_version = yield self.store.get_room_version(event_dict["room_id"])
except NotFoundError:
raise AuthError(403, "Unknown room")
builder = self.event_builder_factory.new(room_version, event_dict)
self.validator.validate_builder(builder)
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
target = UserID.from_string(builder.state_key)
if membership in {Membership.JOIN, Membership.INVITE}:
# If event doesn't include a display name, add one.
profile = self.profile_handler
content = builder.content
try:
if "displayname" not in content:
content["displayname"] = yield profile.get_displayname(target)
if "avatar_url" not in content:
content["avatar_url"] = yield profile.get_avatar_url(target)
except Exception as e:
logger.info(
"Failed to get profile information for %r: %s",
target, e
)
is_exempt = yield self._is_exempt_from_privacy_policy(builder, requester)
if require_consent and not is_exempt:
yield self.assert_accepted_privacy_policy(requester)
if token_id is not None:
builder.internal_metadata.token_id = token_id
if txn_id is not None:
builder.internal_metadata.txn_id = txn_id
event, context = yield self.create_new_client_event(
builder=builder,
requester=requester,
prev_events_and_hashes=prev_events_and_hashes,
)
# In an ideal world we wouldn't need the second part of this condition. However,
# this behaviour isn't spec'd yet, meaning we should be able to deactivate this
# behaviour. Another reason is that this code is also evaluated each time a new
# m.room.aliases event is created, which includes hitting a /directory route.
# Therefore not including this condition here would render the similar one in
# synapse.handlers.directory pointless.
if builder.type == EventTypes.Aliases and self.require_membership_for_aliases:
# Ideally we'd do the membership check in event_auth.check(), which
# describes a spec'd algorithm for authenticating events received over
# federation as well as those created locally. As of room v3, aliases events
# can be created by users that are not in the room, therefore we have to
# tolerate them in event_auth.check().
prev_state_ids = yield context.get_prev_state_ids(self.store)
prev_event_id = prev_state_ids.get((EventTypes.Member, event.sender))
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event or prev_event.membership != Membership.JOIN:
logger.warning(
("Attempt to send `m.room.aliases` in room %s by user %s but"
" membership is %s"),
event.room_id,
event.sender,
prev_event.membership if prev_event else None,
)
raise AuthError(
403,
"You must be in the room to create an alias for it",
)
self.validator.validate_new(event)
defer.returnValue((event, context))
def _is_exempt_from_privacy_policy(self, builder, requester):
""""Determine if an event to be sent is exempt from having to consent
to the privacy policy
Args:
builder (synapse.events.builder.EventBuilder): event being created
requester (Requster): user requesting this event
Returns:
Deferred[bool]: true if the event can be sent without the user
consenting
"""
# the only thing the user can do is join the server notices room.
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
if membership == Membership.JOIN:
return self._is_server_notices_room(builder.room_id)
elif membership == Membership.LEAVE:
# the user is always allowed to leave (but not kick people)
return builder.state_key == requester.user.to_string()
return succeed(False)
@defer.inlineCallbacks
def _is_server_notices_room(self, room_id):
if self.config.server_notices_mxid is None:
defer.returnValue(False)
user_ids = yield self.store.get_users_in_room(room_id)
defer.returnValue(self.config.server_notices_mxid in user_ids)
@defer.inlineCallbacks
def assert_accepted_privacy_policy(self, requester):
"""Check if a user has accepted the privacy policy
Called when the given user is about to do something that requires
privacy consent. We see if the user is exempt and otherwise check that
they have given consent. If they have not, a ConsentNotGiven error is
raised.
Args:
requester (synapse.types.Requester):
The user making the request
Returns:
Deferred[None]: returns normally if the user has consented or is
exempt
Raises:
ConsentNotGivenError: if the user has not given consent yet
"""
if self._block_events_without_consent_error is None:
return
# exempt AS users from needing consent
if requester.app_service is not None:
return
user_id = requester.user.to_string()
# exempt the system notices user
if (
self.config.server_notices_mxid is not None and
user_id == self.config.server_notices_mxid
):
return
u = yield self.store.get_user_by_id(user_id)
assert u is not None
if u["appservice_id"] is not None:
# users registered by an appservice are exempt
return
if u["consent_version"] == self.config.user_consent_version:
return
consent_uri = self._consent_uri_builder.build_user_consent_uri(
requester.user.localpart,
)
msg = self._block_events_without_consent_error % {
'consent_uri': consent_uri,
}
raise ConsentNotGivenError(
msg=msg,
consent_uri=consent_uri,
)
@defer.inlineCallbacks
def send_nonmember_event(self, requester, event, context, ratelimit=True):
"""
Persists and notifies local clients and federation of an event.
Args:
event (FrozenEvent) the event to send.
context (Context) the context of the event.
ratelimit (bool): Whether to rate limit this send.
is_guest (bool): Whether the sender is a guest.
"""
if event.type == EventTypes.Member:
raise SynapseError(
500,
"Tried to send member event through non-member codepath"
)
user = UserID.from_string(event.sender)
assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
if event.is_state():
prev_state = yield self.deduplicate_state_event(event, context)
if prev_state is not None:
logger.info(
"Not bothering to persist state event %s duplicated by %s",
event.event_id, prev_state.event_id,
)
defer.returnValue(prev_state)
yield self.handle_new_client_event(
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
)
@defer.inlineCallbacks
def deduplicate_state_event(self, event, context):
"""
Checks whether event is in the latest resolved state in context.
If so, returns the version of the event in context.
Otherwise, returns None.
"""
prev_state_ids = yield context.get_prev_state_ids(self.store)
prev_event_id = prev_state_ids.get((event.type, event.state_key))
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event:
return
if prev_event and event.user_id == prev_event.user_id:
prev_content = encode_canonical_json(prev_event.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
defer.returnValue(prev_event)
return
@defer.inlineCallbacks
def create_and_send_nonmember_event(
self,
requester,
event_dict,
ratelimit=True,
txn_id=None
):
"""
Creates an event, then sends it.
See self.create_event and self.send_nonmember_event.
"""
# We limit the number of concurrent event sends in a room so that we
# don't fork the DAG too much. If we don't limit then we can end up in
# a situation where event persistence can't keep up, causing
# extremities to pile up, which in turn leads to state resolution
# taking longer.
with (yield self.limiter.queue(event_dict["room_id"])):
event, context = yield self.create_event(
requester,
event_dict,
token_id=requester.access_token_id,
txn_id=txn_id
)
spam_error = self.spam_checker.check_event_for_spam(event)
if spam_error:
if not isinstance(spam_error, string_types):
spam_error = "Spam is not permitted here"
raise SynapseError(
403, spam_error, Codes.FORBIDDEN
)
yield self.send_nonmember_event(
requester,
event,
context,
ratelimit=ratelimit,
)
defer.returnValue(event)
@measure_func("create_new_client_event")
@defer.inlineCallbacks
def create_new_client_event(self, builder, requester=None,
prev_events_and_hashes=None):
"""Create a new event for a local client
Args:
builder (EventBuilder):
requester (synapse.types.Requester|None):
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
Returns:
Deferred[(synapse.events.EventBase, synapse.events.snapshot.EventContext)]
"""
if prev_events_and_hashes is not None:
assert len(prev_events_and_hashes) <= 10, \
"Attempting to create an event with %i prev_events" % (
len(prev_events_and_hashes),
)
else:
prev_events_and_hashes = \
yield self.store.get_prev_events_for_room(builder.room_id)
prev_events = [
(event_id, prev_hashes)
for event_id, prev_hashes, _ in prev_events_and_hashes
]
event = yield builder.build(
prev_event_ids=[p for p, _ in prev_events],
)
context = yield self.state.compute_event_context(event)
if requester:
context.app_service = requester.app_service
self.validator.validate_new(event)
# If this event is an annotation then we check that that the sender
# can't annotate the same way twice (e.g. stops users from liking an
# event multiple times).
relation = event.content.get("m.relates_to", {})
if relation.get("rel_type") == RelationTypes.ANNOTATION:
relates_to = relation["event_id"]
aggregation_key = relation["key"]
already_exists = yield self.store.has_user_annotated_event(
relates_to, event.type, aggregation_key, event.sender,
)
if already_exists:
raise SynapseError(400, "Can't send same reaction twice")
logger.debug(
"Created event %s",
event.event_id,
)
defer.returnValue(
(event, context,)
)
@measure_func("handle_new_client_event")
@defer.inlineCallbacks
def handle_new_client_event(
self,
requester,
event,
context,
ratelimit=True,
extra_users=[],
):
"""Processes a new event. This includes checking auth, persisting it,
notifying users, sending to remote servers, etc.
If called from a worker will hit out to the master process for final
processing.
Args:
requester (Requester)
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
extra_users (list(UserID)): Any extra users to notify about event
"""
if event.is_state() and (event.type, event.state_key) == (EventTypes.Create, ""):
room_version = event.content.get(
"room_version", RoomVersions.V1.identifier
)
else:
room_version = yield self.store.get_room_version(event.room_id)
try:
yield self.auth.check_from_context(room_version, event, context)
except AuthError as err:
logger.warn("Denying new event %r because %s", event, err)
raise err
# Ensure that we can round trip before trying to persist in db
try:
dump = frozendict_json_encoder.encode(event.content)
json.loads(dump)
except Exception:
logger.exception("Failed to encode content: %r", event.content)
raise
yield self.action_generator.handle_push_actions_for_event(
event, context
)
# reraise does not allow inlineCallbacks to preserve the stacktrace, so we
# hack around with a try/finally instead.
success = False
try:
# If we're a worker we need to hit out to the master.
if self.config.worker_app:
yield self.send_event_to_master(
event_id=event.event_id,
store=self.store,
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
extra_users=extra_users,
)
success = True
return
yield self.persist_and_notify_client_event(
requester,
event,
context,
ratelimit=ratelimit,
extra_users=extra_users,
)
success = True
finally:
if not success:
# Ensure that we actually remove the entries in the push actions
# staging area, if we calculated them.
run_in_background(
self.store.remove_push_actions_from_staging,
event.event_id,
)
@defer.inlineCallbacks
def persist_and_notify_client_event(
self,
requester,
event,
context,
ratelimit=True,
extra_users=[],
):
"""Called when we have fully built the event, have already
calculated the push actions for the event, and checked auth.
This should only be run on master.
"""
assert not self.config.worker_app
if ratelimit:
yield self.base_handler.ratelimit(requester)
yield self.base_handler.maybe_kick_guest_users(event, context)
if event.type == EventTypes.CanonicalAlias:
# Check the alias is acually valid (at this time at least)
room_alias_str = event.content.get("alias", None)
if room_alias_str:
room_alias = RoomAlias.from_string(room_alias_str)
directory_handler = self.hs.get_handlers().directory_handler
mapping = yield directory_handler.get_association(room_alias)
if mapping["room_id"] != event.room_id:
raise SynapseError(
400,
"Room alias %s does not point to the room" % (
room_alias_str,
)
)
federation_handler = self.hs.get_handlers().federation_handler
if event.type == EventTypes.Member:
if event.content["membership"] == Membership.INVITE:
def is_inviter_member_event(e):
return (
e.type == EventTypes.Member and
e.sender == event.sender
)
current_state_ids = yield context.get_current_state_ids(self.store)
state_to_include_ids = [
e_id
for k, e_id in iteritems(current_state_ids)
if k[0] in self.hs.config.room_invite_state_types
or k == (EventTypes.Member, event.sender)
]
state_to_include = yield self.store.get_events(state_to_include_ids)
event.unsigned["invite_room_state"] = [
{
"type": e.type,
"state_key": e.state_key,
"content": e.content,
"sender": e.sender,
}
for e in itervalues(state_to_include)
]
invitee = UserID.from_string(event.state_key)
if not self.hs.is_mine(invitee):
# TODO: Can we add signature from remote server in a nicer
# way? If we have been invited by a remote server, we need
# to get them to sign the event.
returned_invite = yield federation_handler.send_invite(
invitee.domain,
event,
)
event.unsigned.pop("room_state", None)
# TODO: Make sure the signatures actually are correct.
event.signatures.update(
returned_invite.signatures
)
if event.type == EventTypes.Redaction:
prev_state_ids = yield context.get_prev_state_ids(self.store)
auth_events_ids = yield self.auth.compute_auth_events(
event, prev_state_ids, for_verification=True,
)
auth_events = yield self.store.get_events(auth_events_ids)
auth_events = {
(e.type, e.state_key): e for e in auth_events.values()
}
room_version = yield self.store.get_room_version(event.room_id)
if self.auth.check_redaction(room_version, event, auth_events=auth_events):
original_event = yield self.store.get_event(
event.redacts,
check_redacted=False,
get_prev_content=False,
allow_rejected=False,
allow_none=False
)
if event.user_id != original_event.user_id:
raise AuthError(
403,
"You don't have permission to redact events"
)
# We've already checked.
event.internal_metadata.recheck_redaction = False
if event.type == EventTypes.Create:
prev_state_ids = yield context.get_prev_state_ids(self.store)
if prev_state_ids:
raise AuthError(
403,
"Changing the room create event is forbidden",
)
(event_stream_id, max_stream_id) = yield self.store.persist_event(
event, context=context
)
yield self.pusher_pool.on_new_notifications(
event_stream_id, max_stream_id,
)
def _notify():
try:
self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id,
extra_users=extra_users
)
except Exception:
logger.exception("Error notifying about new room event")
run_in_background(_notify)
if event.type == EventTypes.Message:
# We don't want to block sending messages on any presence code. This
# matters as sometimes presence code can take a while.
run_in_background(self._bump_active_time, requester.user)
@defer.inlineCallbacks
def _bump_active_time(self, user):
try:
presence = self.hs.get_presence_handler()
yield presence.bump_presence_active_time(user)
except Exception:
logger.exception("Error bumping presence active time")
class EventCreationHandler(object):
def __init__(self, hs):
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.clock = hs.get_clock()
self.validator = EventValidator()
self.profile_handler = hs.get_profile_handler()
self.event_builder_factory = hs.get_event_builder_factory()
self.server_name = hs.hostname
self.ratelimiter = hs.get_ratelimiter()
self.notifier = hs.get_notifier()
self.config = hs.config
self.require_membership_for_aliases = hs.config.require_membership_for_aliases
self.send_event_to_master = ReplicationSendEventRestServlet.make_client(hs)
# This is only used to get at ratelimit function, and maybe_kick_guest_users
self.base_handler = BaseHandler(hs)
self.pusher_pool = hs.get_pusherpool()
# We arbitrarily limit concurrent event creation for a room to 5.
# This is to stop us from diverging history *too* much.
self.limiter = Linearizer(max_count=5, name="room_event_creation_limit")
self.action_generator = hs.get_action_generator()
self.spam_checker = hs.get_spam_checker()
self.third_party_event_rules = hs.get_third_party_event_rules()
self._block_events_without_consent_error = (
self.config.block_events_without_consent_error
)
# we need to construct a ConsentURIBuilder here, as it checks that the necessary
# config options, but *only* if we have a configuration for which we are
# going to need it.
if self._block_events_without_consent_error:
self._consent_uri_builder = ConsentURIBuilder(self.config)
if (
not self.config.worker_app
and self.config.cleanup_extremities_with_dummy_events
):
self.clock.looping_call(
lambda: run_as_background_process(
"send_dummy_events_to_fill_extremities",
self._send_dummy_events_to_fill_extremities,
),
5 * 60 * 1000,
)
@defer.inlineCallbacks
def create_event(
self,
requester,
event_dict,
token_id=None,
txn_id=None,
prev_events_and_hashes=None,
require_consent=True,
):
"""
Given a dict from a client, create a new event.
Creates an FrozenEvent object, filling out auth_events, prev_events,
etc.
Adds display names to Join membership events.
Args:
requester
event_dict (dict): An entire event
token_id (str)
txn_id (str)
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
require_consent (bool): Whether to check if the requester has
consented to privacy policy.
Raises:
ResourceLimitError if server is blocked to some resource being
exceeded
Returns:
Tuple of created event (FrozenEvent), Context
"""
yield self.auth.check_auth_blocking(requester.user.to_string())
if event_dict["type"] == EventTypes.Create and event_dict["state_key"] == "":
room_version = event_dict["content"]["room_version"]
else:
try:
room_version = yield self.store.get_room_version(event_dict["room_id"])
except NotFoundError:
raise AuthError(403, "Unknown room")
builder = self.event_builder_factory.new(room_version, event_dict)
self.validator.validate_builder(builder)
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
target = UserID.from_string(builder.state_key)
if membership in {Membership.JOIN, Membership.INVITE}:
# If event doesn't include a display name, add one.
profile = self.profile_handler
content = builder.content
try:
if "displayname" not in content:
content["displayname"] = yield profile.get_displayname(target)
if "avatar_url" not in content:
content["avatar_url"] = yield profile.get_avatar_url(target)
except Exception as e:
logger.info(
"Failed to get profile information for %r: %s", target, e
)
is_exempt = yield self._is_exempt_from_privacy_policy(builder, requester)
if require_consent and not is_exempt:
yield self.assert_accepted_privacy_policy(requester)
if token_id is not None:
builder.internal_metadata.token_id = token_id
if txn_id is not None:
builder.internal_metadata.txn_id = txn_id
event, context = yield self.create_new_client_event(
builder=builder,
requester=requester,
prev_events_and_hashes=prev_events_and_hashes,
)
# In an ideal world we wouldn't need the second part of this condition. However,
# this behaviour isn't spec'd yet, meaning we should be able to deactivate this
# behaviour. Another reason is that this code is also evaluated each time a new
# m.room.aliases event is created, which includes hitting a /directory route.
# Therefore not including this condition here would render the similar one in
# synapse.handlers.directory pointless.
if builder.type == EventTypes.Aliases and self.require_membership_for_aliases:
# Ideally we'd do the membership check in event_auth.check(), which
# describes a spec'd algorithm for authenticating events received over
# federation as well as those created locally. As of room v3, aliases events
# can be created by users that are not in the room, therefore we have to
# tolerate them in event_auth.check().
prev_state_ids = yield context.get_prev_state_ids(self.store)
prev_event_id = prev_state_ids.get((EventTypes.Member, event.sender))
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event or prev_event.membership != Membership.JOIN:
logger.warning(
(
"Attempt to send `m.room.aliases` in room %s by user %s but"
" membership is %s"
),
event.room_id,
event.sender,
prev_event.membership if prev_event else None,
)
raise AuthError(
403, "You must be in the room to create an alias for it"
)
self.validator.validate_new(event)
defer.returnValue((event, context))
def _is_exempt_from_privacy_policy(self, builder, requester):
""""Determine if an event to be sent is exempt from having to consent
to the privacy policy
Args:
builder (synapse.events.builder.EventBuilder): event being created
requester (Requster): user requesting this event
Returns:
Deferred[bool]: true if the event can be sent without the user
consenting
"""
# the only thing the user can do is join the server notices room.
if builder.type == EventTypes.Member:
membership = builder.content.get("membership", None)
if membership == Membership.JOIN:
return self._is_server_notices_room(builder.room_id)
elif membership == Membership.LEAVE:
# the user is always allowed to leave (but not kick people)
return builder.state_key == requester.user.to_string()
return succeed(False)
@defer.inlineCallbacks
def _is_server_notices_room(self, room_id):
if self.config.server_notices_mxid is None:
defer.returnValue(False)
user_ids = yield self.store.get_users_in_room(room_id)
defer.returnValue(self.config.server_notices_mxid in user_ids)
@defer.inlineCallbacks
def assert_accepted_privacy_policy(self, requester):
"""Check if a user has accepted the privacy policy
Called when the given user is about to do something that requires
privacy consent. We see if the user is exempt and otherwise check that
they have given consent. If they have not, a ConsentNotGiven error is
raised.
Args:
requester (synapse.types.Requester):
The user making the request
Returns:
Deferred[None]: returns normally if the user has consented or is
exempt
Raises:
ConsentNotGivenError: if the user has not given consent yet
"""
if self._block_events_without_consent_error is None:
return
# exempt AS users from needing consent
if requester.app_service is not None:
return
user_id = requester.user.to_string()
# exempt the system notices user
if (
self.config.server_notices_mxid is not None
and user_id == self.config.server_notices_mxid
):
return
u = yield self.store.get_user_by_id(user_id)
assert u is not None
if u["appservice_id"] is not None:
# users registered by an appservice are exempt
return
if u["consent_version"] == self.config.user_consent_version:
return
consent_uri = self._consent_uri_builder.build_user_consent_uri(
requester.user.localpart
)
msg = self._block_events_without_consent_error % {"consent_uri": consent_uri}
raise ConsentNotGivenError(msg=msg, consent_uri=consent_uri)
@defer.inlineCallbacks
def send_nonmember_event(self, requester, event, context, ratelimit=True):
"""
Persists and notifies local clients and federation of an event.
Args:
event (FrozenEvent) the event to send.
context (Context) the context of the event.
ratelimit (bool): Whether to rate limit this send.
is_guest (bool): Whether the sender is a guest.
"""
if event.type == EventTypes.Member:
raise SynapseError(
500, "Tried to send member event through non-member codepath"
)
user = UserID.from_string(event.sender)
assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
if event.is_state():
prev_state = yield self.deduplicate_state_event(event, context)
if prev_state is not None:
logger.info(
"Not bothering to persist state event %s duplicated by %s",
event.event_id,
prev_state.event_id,
)
defer.returnValue(prev_state)
yield self.handle_new_client_event(
requester=requester, event=event, context=context, ratelimit=ratelimit
)
@defer.inlineCallbacks
def deduplicate_state_event(self, event, context):
"""
Checks whether event is in the latest resolved state in context.
If so, returns the version of the event in context.
Otherwise, returns None.
"""
prev_state_ids = yield context.get_prev_state_ids(self.store)
prev_event_id = prev_state_ids.get((event.type, event.state_key))
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if not prev_event:
return
if prev_event and event.user_id == prev_event.user_id:
prev_content = encode_canonical_json(prev_event.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
defer.returnValue(prev_event)
return
@defer.inlineCallbacks
def create_and_send_nonmember_event(
self, requester, event_dict, ratelimit=True, txn_id=None
):
"""
Creates an event, then sends it.
See self.create_event and self.send_nonmember_event.
"""
# We limit the number of concurrent event sends in a room so that we
# don't fork the DAG too much. If we don't limit then we can end up in
# a situation where event persistence can't keep up, causing
# extremities to pile up, which in turn leads to state resolution
# taking longer.
with (yield self.limiter.queue(event_dict["room_id"])):
event, context = yield self.create_event(
requester, event_dict, token_id=requester.access_token_id, txn_id=txn_id
)
spam_error = self.spam_checker.check_event_for_spam(event)
if spam_error:
if not isinstance(spam_error, string_types):
spam_error = "Spam is not permitted here"
raise SynapseError(403, spam_error, Codes.FORBIDDEN)
yield self.send_nonmember_event(
requester, event, context, ratelimit=ratelimit
)
defer.returnValue(event)
@measure_func("create_new_client_event")
@defer.inlineCallbacks
def create_new_client_event(
self, builder, requester=None, prev_events_and_hashes=None
):
"""Create a new event for a local client
Args:
builder (EventBuilder):
requester (synapse.types.Requester|None):
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
If None, they will be requested from the database.
Returns:
Deferred[(synapse.events.EventBase, synapse.events.snapshot.EventContext)]
"""
if prev_events_and_hashes is not None:
assert len(prev_events_and_hashes) <= 10, (
"Attempting to create an event with %i prev_events"
% (len(prev_events_and_hashes),)
)
else:
prev_events_and_hashes = yield self.store.get_prev_events_for_room(
builder.room_id
)
prev_events = [
(event_id, prev_hashes)
for event_id, prev_hashes, _ in prev_events_and_hashes
]
event = yield builder.build(prev_event_ids=[p for p, _ in prev_events])
context = yield self.state.compute_event_context(event)
if requester:
context.app_service = requester.app_service
self.validator.validate_new(event)
# If this event is an annotation then we check that that the sender
# can't annotate the same way twice (e.g. stops users from liking an
# event multiple times).
relation = event.content.get("m.relates_to", {})
if relation.get("rel_type") == RelationTypes.ANNOTATION:
relates_to = relation["event_id"]
aggregation_key = relation["key"]
already_exists = yield self.store.has_user_annotated_event(
relates_to, event.type, aggregation_key, event.sender
)
if already_exists:
raise SynapseError(400, "Can't send same reaction twice")
logger.debug("Created event %s", event.event_id)
defer.returnValue((event, context))
@measure_func("handle_new_client_event")
@defer.inlineCallbacks
def handle_new_client_event(
self, requester, event, context, ratelimit=True, extra_users=[]
):
"""Processes a new event. This includes checking auth, persisting it,
notifying users, sending to remote servers, etc.
If called from a worker will hit out to the master process for final
processing.
Args:
requester (Requester)
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
extra_users (list(UserID)): Any extra users to notify about event
"""
if event.is_state() and (event.type, event.state_key) == (
EventTypes.Create,
"",
):
room_version = event.content.get("room_version", RoomVersions.V1.identifier)
else:
room_version = yield self.store.get_room_version(event.room_id)
event_allowed = yield self.third_party_event_rules.check_event_allowed(
event, context
)
if not event_allowed:
raise SynapseError(
403, "This event is not allowed in this context", Codes.FORBIDDEN
)
try:
yield self.auth.check_from_context(room_version, event, context)
except AuthError as err:
logger.warn("Denying new event %r because %s", event, err)
raise err
# Ensure that we can round trip before trying to persist in db
try:
dump = frozendict_json_encoder.encode(event.content)
json.loads(dump)
except Exception:
logger.exception("Failed to encode content: %r", event.content)
raise
yield self.action_generator.handle_push_actions_for_event(event, context)
# reraise does not allow inlineCallbacks to preserve the stacktrace, so we
# hack around with a try/finally instead.
success = False
try:
# If we're a worker we need to hit out to the master.
if self.config.worker_app:
yield self.send_event_to_master(
event_id=event.event_id,
store=self.store,
requester=requester,
event=event,
context=context,
ratelimit=ratelimit,
extra_users=extra_users,
)
success = True
return
yield self.persist_and_notify_client_event(
requester, event, context, ratelimit=ratelimit, extra_users=extra_users
)
success = True
finally:
if not success:
# Ensure that we actually remove the entries in the push actions
# staging area, if we calculated them.
run_in_background(
self.store.remove_push_actions_from_staging, event.event_id
)
@defer.inlineCallbacks
def persist_and_notify_client_event(
self, requester, event, context, ratelimit=True, extra_users=[]
):
"""Called when we have fully built the event, have already
calculated the push actions for the event, and checked auth.
This should only be run on master.
"""
assert not self.config.worker_app
if ratelimit:
yield self.base_handler.ratelimit(requester)
yield self.base_handler.maybe_kick_guest_users(event, context)
if event.type == EventTypes.CanonicalAlias:
# Check the alias is acually valid (at this time at least)
room_alias_str = event.content.get("alias", None)
if room_alias_str:
room_alias = RoomAlias.from_string(room_alias_str)
directory_handler = self.hs.get_handlers().directory_handler
mapping = yield directory_handler.get_association(room_alias)
if mapping["room_id"] != event.room_id:
raise SynapseError(
400,
"Room alias %s does not point to the room" % (room_alias_str,),
)
federation_handler = self.hs.get_handlers().federation_handler
if event.type == EventTypes.Member:
if event.content["membership"] == Membership.INVITE:
def is_inviter_member_event(e):
return e.type == EventTypes.Member and e.sender == event.sender
current_state_ids = yield context.get_current_state_ids(self.store)
state_to_include_ids = [
e_id
for k, e_id in iteritems(current_state_ids)
if k[0] in self.hs.config.room_invite_state_types
or k == (EventTypes.Member, event.sender)
]
state_to_include = yield self.store.get_events(state_to_include_ids)
event.unsigned["invite_room_state"] = [
{
"type": e.type,
"state_key": e.state_key,
"content": e.content,
"sender": e.sender,
}
for e in itervalues(state_to_include)
]
invitee = UserID.from_string(event.state_key)
if not self.hs.is_mine(invitee):
# TODO: Can we add signature from remote server in a nicer
# way? If we have been invited by a remote server, we need
# to get them to sign the event.
returned_invite = yield federation_handler.send_invite(
invitee.domain, event
)
event.unsigned.pop("room_state", None)
# TODO: Make sure the signatures actually are correct.
event.signatures.update(returned_invite.signatures)
if event.type == EventTypes.Redaction:
prev_state_ids = yield context.get_prev_state_ids(self.store)
auth_events_ids = yield self.auth.compute_auth_events(
event, prev_state_ids, for_verification=True
)
auth_events = yield self.store.get_events(auth_events_ids)
auth_events = {(e.type, e.state_key): e for e in auth_events.values()}
room_version = yield self.store.get_room_version(event.room_id)
if self.auth.check_redaction(room_version, event, auth_events=auth_events):
original_event = yield self.store.get_event(
event.redacts,
check_redacted=False,
get_prev_content=False,
allow_rejected=False,
allow_none=False,
)
if event.user_id != original_event.user_id:
raise AuthError(403, "You don't have permission to redact events")
# We've already checked.
event.internal_metadata.recheck_redaction = False
if event.type == EventTypes.Create:
prev_state_ids = yield context.get_prev_state_ids(self.store)
if prev_state_ids:
raise AuthError(403, "Changing the room create event is forbidden")
(event_stream_id, max_stream_id) = yield self.store.persist_event(
event, context=context
)
yield self.pusher_pool.on_new_notifications(event_stream_id, max_stream_id)
def _notify():
try:
self.notifier.on_new_room_event(
event, event_stream_id, max_stream_id, extra_users=extra_users
)
except Exception:
logger.exception("Error notifying about new room event")
run_in_background(_notify)
if event.type == EventTypes.Message:
# We don't want to block sending messages on any presence code. This
# matters as sometimes presence code can take a while.
run_in_background(self._bump_active_time, requester.user)
@defer.inlineCallbacks
def _bump_active_time(self, user):
try:
presence = self.hs.get_presence_handler()
yield presence.bump_presence_active_time(user)
except Exception:
logger.exception("Error bumping presence active time")
@defer.inlineCallbacks
def _send_dummy_events_to_fill_extremities(self):
"""Background task to send dummy events into rooms that have a large
number of extremities
"""
room_ids = yield self.store.get_rooms_with_many_extremities(
min_count=10, limit=5
)
for room_id in room_ids:
# For each room we need to find a joined member we can use to send
# the dummy event with.
prev_events_and_hashes = yield self.store.get_prev_events_for_room(room_id)
latest_event_ids = (event_id for (event_id, _, _) in prev_events_and_hashes)
members = yield self.state.get_current_users_in_room(
room_id, latest_event_ids=latest_event_ids
)
user_id = None
for member in members:
if self.hs.is_mine_id(member):
user_id = member
break
if not user_id:
# We don't have a joined user.
# TODO: We should do something here to stop the room from
# appearing next time.
continue
requester = create_requester(user_id)
event, context = yield self.create_event(
requester,
{
"type": "org.matrix.dummy_event",
"content": {},
"room_id": room_id,
"sender": user_id,
},
prev_events_and_hashes=prev_events_and_hashes,
)
event.internal_metadata.proactively_send = False
yield self.send_nonmember_event(requester, event, context, ratelimit=False)