427 lines
14 KiB
Python
427 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from distutils.util import strtobool
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import six
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from unpaddedbase64 import encode_base64
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from synapse.api.errors import UnsupportedRoomVersionError
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, EventFormatVersions
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from synapse.util.caches import intern_dict
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from synapse.util.frozenutils import freeze
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# Whether we should use frozen_dict in FrozenEvent. Using frozen_dicts prevents
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# bugs where we accidentally share e.g. signature dicts. However, converting a
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# dict to frozen_dicts is expensive.
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#
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# NOTE: This is overridden by the configuration by the Synapse worker apps, but
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# for the sake of tests, it is set here while it cannot be configured on the
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# homeserver object itself.
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USE_FROZEN_DICTS = strtobool(os.environ.get("SYNAPSE_USE_FROZEN_DICTS", "0"))
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class _EventInternalMetadata(object):
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def __init__(self, internal_metadata_dict):
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self.__dict__ = dict(internal_metadata_dict)
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def get_dict(self):
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return dict(self.__dict__)
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def is_outlier(self):
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return getattr(self, "outlier", False)
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def is_out_of_band_membership(self):
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"""Whether this is an out of band membership, like an invite or an invite
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rejection. This is needed as those events are marked as outliers, but
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they still need to be processed as if they're new events (e.g. updating
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invite state in the database, relaying to clients, etc).
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"""
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return getattr(self, "out_of_band_membership", False)
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def get_send_on_behalf_of(self):
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"""Whether this server should send the event on behalf of another server.
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This is used by the federation "send_join" API to forward the initial join
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event for a server in the room.
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returns a str with the name of the server this event is sent on behalf of.
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"""
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return getattr(self, "send_on_behalf_of", None)
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def need_to_check_redaction(self):
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"""Whether the redaction event needs to be rechecked when fetching
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from the database.
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Starting in room v3 redaction events are accepted up front, and later
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checked to see if the redacter and redactee's domains match.
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If the sender of the redaction event is allowed to redact any event
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due to auth rules, then this will always return false.
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Returns:
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bool
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"""
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return getattr(self, "recheck_redaction", False)
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def is_soft_failed(self):
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"""Whether the event has been soft failed.
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Soft failed events should be handled as usual, except:
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1. They should not go down sync or event streams, or generally
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sent to clients.
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2. They should not be added to the forward extremities (and
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therefore not to current state).
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Returns:
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bool
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"""
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return getattr(self, "soft_failed", False)
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def should_proactively_send(self):
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"""Whether the event, if ours, should be sent to other clients and
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servers.
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This is used for sending dummy events internally. Servers and clients
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can still explicitly fetch the event.
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Returns:
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bool
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"""
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return getattr(self, "proactively_send", True)
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def is_redacted(self):
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"""Whether the event has been redacted.
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This is used for efficiently checking whether an event has been
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marked as redacted without needing to make another database call.
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Returns:
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bool
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"""
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return getattr(self, "redacted", False)
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def _event_dict_property(key):
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# We want to be able to use hasattr with the event dict properties.
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# However, (on python3) hasattr expects AttributeError to be raised. Hence,
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# we need to transform the KeyError into an AttributeError
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def getter(self):
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try:
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return self._event_dict[key]
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except KeyError:
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raise AttributeError(key)
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def setter(self, v):
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try:
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self._event_dict[key] = v
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except KeyError:
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raise AttributeError(key)
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def delete(self):
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try:
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del self._event_dict[key]
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except KeyError:
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raise AttributeError(key)
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return property(getter, setter, delete)
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class EventBase(object):
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def __init__(
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self,
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event_dict,
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signatures={},
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unsigned={},
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internal_metadata_dict={},
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rejected_reason=None,
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):
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self.signatures = signatures
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self.unsigned = unsigned
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self.rejected_reason = rejected_reason
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self._event_dict = event_dict
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self.internal_metadata = _EventInternalMetadata(internal_metadata_dict)
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auth_events = _event_dict_property("auth_events")
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depth = _event_dict_property("depth")
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content = _event_dict_property("content")
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hashes = _event_dict_property("hashes")
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origin = _event_dict_property("origin")
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origin_server_ts = _event_dict_property("origin_server_ts")
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prev_events = _event_dict_property("prev_events")
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redacts = _event_dict_property("redacts")
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room_id = _event_dict_property("room_id")
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sender = _event_dict_property("sender")
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user_id = _event_dict_property("sender")
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@property
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def membership(self):
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return self.content["membership"]
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def is_state(self):
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return hasattr(self, "state_key") and self.state_key is not None
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def get_dict(self):
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d = dict(self._event_dict)
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d.update({"signatures": self.signatures, "unsigned": dict(self.unsigned)})
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return d
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def get(self, key, default=None):
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return self._event_dict.get(key, default)
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def get_internal_metadata_dict(self):
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return self.internal_metadata.get_dict()
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def get_pdu_json(self, time_now=None):
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pdu_json = self.get_dict()
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if time_now is not None and "age_ts" in pdu_json["unsigned"]:
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age = time_now - pdu_json["unsigned"]["age_ts"]
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pdu_json.setdefault("unsigned", {})["age"] = int(age)
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del pdu_json["unsigned"]["age_ts"]
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# This may be a frozen event
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pdu_json["unsigned"].pop("redacted_because", None)
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return pdu_json
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def __set__(self, instance, value):
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raise AttributeError("Unrecognized attribute %s" % (instance,))
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def __getitem__(self, field):
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return self._event_dict[field]
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def __contains__(self, field):
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return field in self._event_dict
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def items(self):
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return list(self._event_dict.items())
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def keys(self):
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return six.iterkeys(self._event_dict)
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def prev_event_ids(self):
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"""Returns the list of prev event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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list[str]: The list of event IDs of this event's prev_events
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"""
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return [e for e, _ in self.prev_events]
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def auth_event_ids(self):
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"""Returns the list of auth event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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list[str]: The list of event IDs of this event's auth_events
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"""
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return [e for e, _ in self.auth_events]
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class FrozenEvent(EventBase):
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format_version = EventFormatVersions.V1 # All events of this type are V1
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def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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# copy.deepcopy
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signatures = {
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name: {sig_id: sig for sig_id, sig in sigs.items()}
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for name, sigs in event_dict.pop("signatures", {}).items()
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}
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unsigned = dict(event_dict.pop("unsigned", {}))
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# We intern these strings because they turn up a lot (especially when
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# caching).
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event_dict = intern_dict(event_dict)
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if USE_FROZEN_DICTS:
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frozen_dict = freeze(event_dict)
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else:
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frozen_dict = event_dict
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self.event_id = event_dict["event_id"]
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self.type = event_dict["type"]
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if "state_key" in event_dict:
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self.state_key = event_dict["state_key"]
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super(FrozenEvent, self).__init__(
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frozen_dict,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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rejected_reason=rejected_reason,
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)
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def __str__(self):
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return self.__repr__()
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def __repr__(self):
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return "<FrozenEvent event_id='%s', type='%s', state_key='%s'>" % (
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self.get("event_id", None),
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self.get("type", None),
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self.get("state_key", None),
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)
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class FrozenEventV2(EventBase):
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format_version = EventFormatVersions.V2 # All events of this type are V2
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def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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# copy.deepcopy
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signatures = {
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name: {sig_id: sig for sig_id, sig in sigs.items()}
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for name, sigs in event_dict.pop("signatures", {}).items()
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}
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assert "event_id" not in event_dict
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unsigned = dict(event_dict.pop("unsigned", {}))
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# We intern these strings because they turn up a lot (especially when
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# caching).
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event_dict = intern_dict(event_dict)
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if USE_FROZEN_DICTS:
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frozen_dict = freeze(event_dict)
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else:
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frozen_dict = event_dict
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self._event_id = None
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self.type = event_dict["type"]
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if "state_key" in event_dict:
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self.state_key = event_dict["state_key"]
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super(FrozenEventV2, self).__init__(
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frozen_dict,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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rejected_reason=rejected_reason,
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)
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@property
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def event_id(self):
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# We have to import this here as otherwise we get an import loop which
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# is hard to break.
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from synapse.crypto.event_signing import compute_event_reference_hash
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if self._event_id:
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return self._event_id
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self._event_id = "$" + encode_base64(compute_event_reference_hash(self)[1])
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return self._event_id
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def prev_event_ids(self):
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"""Returns the list of prev event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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list[str]: The list of event IDs of this event's prev_events
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"""
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return self.prev_events
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def auth_event_ids(self):
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"""Returns the list of auth event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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list[str]: The list of event IDs of this event's auth_events
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"""
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return self.auth_events
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def __str__(self):
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return self.__repr__()
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def __repr__(self):
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return "<%s event_id='%s', type='%s', state_key='%s'>" % (
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self.__class__.__name__,
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self.event_id,
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self.get("type", None),
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self.get("state_key", None),
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)
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class FrozenEventV3(FrozenEventV2):
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"""FrozenEventV3, which differs from FrozenEventV2 only in the event_id format"""
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format_version = EventFormatVersions.V3 # All events of this type are V3
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@property
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def event_id(self):
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# We have to import this here as otherwise we get an import loop which
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# is hard to break.
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from synapse.crypto.event_signing import compute_event_reference_hash
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if self._event_id:
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return self._event_id
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self._event_id = "$" + encode_base64(
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compute_event_reference_hash(self)[1], urlsafe=True
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)
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return self._event_id
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def room_version_to_event_format(room_version):
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"""Converts a room version string to the event format
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Args:
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room_version (str)
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Returns:
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int
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Raises:
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UnsupportedRoomVersionError if the room version is unknown
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"""
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v = KNOWN_ROOM_VERSIONS.get(room_version)
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if not v:
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# this can happen if support is withdrawn for a room version
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raise UnsupportedRoomVersionError()
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return v.event_format
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def event_type_from_format_version(format_version):
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"""Returns the python type to use to construct an Event object for the
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given event format version.
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Args:
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format_version (int): The event format version
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Returns:
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type: A type that can be initialized as per the initializer of
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`FrozenEvent`
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"""
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if format_version == EventFormatVersions.V1:
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return FrozenEvent
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elif format_version == EventFormatVersions.V2:
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return FrozenEventV2
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elif format_version == EventFormatVersions.V3:
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return FrozenEventV3
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else:
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raise Exception("No event format %r" % (format_version,))
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