MatrixSynapse/synapse/events/utils.py

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# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2021 The Matrix.org Foundation C.I.C.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import collections.abc
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import re
from typing import (
TYPE_CHECKING,
Any,
Callable,
Dict,
Iterable,
List,
Mapping,
MutableMapping,
Optional,
Union,
)
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import attr
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from synapse.api.constants import EventContentFields, EventTypes, RelationTypes
from synapse.api.errors import Codes, SynapseError
from synapse.api.room_versions import RoomVersion
from synapse.types import JsonDict
from synapse.util.frozenutils import unfreeze
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from . import EventBase
if TYPE_CHECKING:
from synapse.handlers.relations import BundledAggregations
# Split strings on "." but not "\." This uses a negative lookbehind assertion for '\'
# (?<!stuff) matches if the current position in the string is not preceded
# by a match for 'stuff'.
# TODO: This is fast, but fails to handle "foo\\.bar" which should be treated as
# the literal fields "foo\" and "bar" but will instead be treated as "foo\\.bar"
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SPLIT_FIELD_REGEX = re.compile(r"(?<!\\)\.")
CANONICALJSON_MAX_INT = (2**53) - 1
CANONICALJSON_MIN_INT = -CANONICALJSON_MAX_INT
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def prune_event(event: EventBase) -> EventBase:
"""Returns a pruned version of the given event, which removes all keys we
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don't know about or think could potentially be dodgy.
This is used when we "redact" an event. We want to remove all fields that
the user has specified, but we do want to keep necessary information like
type, state_key etc.
"""
pruned_event_dict = prune_event_dict(event.room_version, event.get_dict())
from . import make_event_from_dict
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pruned_event = make_event_from_dict(
pruned_event_dict, event.room_version, event.internal_metadata.get_dict()
)
# copy the internal fields
pruned_event.internal_metadata.stream_ordering = (
event.internal_metadata.stream_ordering
)
pruned_event.internal_metadata.outlier = event.internal_metadata.outlier
# Mark the event as redacted
pruned_event.internal_metadata.redacted = True
return pruned_event
def prune_event_dict(room_version: RoomVersion, event_dict: JsonDict) -> JsonDict:
"""Redacts the event_dict in the same way as `prune_event`, except it
operates on dicts rather than event objects
Returns:
A copy of the pruned event dict
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"""
allowed_keys = [
"event_id",
"sender",
"room_id",
"hashes",
"signatures",
"content",
"type",
"state_key",
"depth",
"prev_events",
"auth_events",
"origin",
"origin_server_ts",
]
# Room versions from before MSC2176 had additional allowed keys.
if not room_version.msc2176_redaction_rules:
allowed_keys.extend(["prev_state", "membership"])
event_type = event_dict["type"]
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new_content = {}
def add_fields(*fields: str) -> None:
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for field in fields:
if field in event_dict["content"]:
new_content[field] = event_dict["content"][field]
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if event_type == EventTypes.Member:
add_fields("membership")
if room_version.msc3375_redaction_rules:
add_fields(EventContentFields.AUTHORISING_USER)
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elif event_type == EventTypes.Create:
# MSC2176 rules state that create events cannot be redacted.
if room_version.msc2176_redaction_rules:
return event_dict
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add_fields("creator")
elif event_type == EventTypes.JoinRules:
add_fields("join_rule")
if room_version.msc3083_join_rules:
add_fields("allow")
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elif event_type == EventTypes.PowerLevels:
add_fields(
"users",
"users_default",
"events",
"events_default",
"state_default",
"ban",
"kick",
"redact",
)
if room_version.msc2176_redaction_rules:
add_fields("invite")
Make historical events discoverable from backfill for servers without any scrollback history (MSC2716) (#10245) * Make historical messages available to federated servers Part of MSC2716: https://github.com/matrix-org/matrix-doc/pull/2716 Follow-up to https://github.com/matrix-org/synapse/pull/9247 * Debug message not available on federation * Add base starting insertion point when no chunk ID is provided * Fix messages from multiple senders in historical chunk Follow-up to https://github.com/matrix-org/synapse/pull/9247 Part of MSC2716: https://github.com/matrix-org/matrix-doc/pull/2716 --- Previously, Synapse would throw a 403, `Cannot force another user to join.`, because we were trying to use `?user_id` from a single virtual user which did not match with messages from other users in the chunk. * Remove debug lines * Messing with selecting insertion event extremeties * Move db schema change to new version * Add more better comments * Make a fake requester with just what we need See https://github.com/matrix-org/synapse/pull/10276#discussion_r660999080 * Store insertion events in table * Make base insertion event float off on its own See https://github.com/matrix-org/synapse/pull/10250#issuecomment-875711889 Conflicts: synapse/rest/client/v1/room.py * Validate that the app service can actually control the given user See https://github.com/matrix-org/synapse/pull/10276#issuecomment-876316455 Conflicts: synapse/rest/client/v1/room.py * Add some better comments on what we're trying to check for * Continue debugging * Share validation logic * Add inserted historical messages to /backfill response * Remove debug sql queries * Some marker event implemntation trials * Clean up PR * Rename insertion_event_id to just event_id * Add some better sql comments * More accurate description * Add changelog * Make it clear what MSC the change is part of * Add more detail on which insertion event came through * Address review and improve sql queries * Only use event_id as unique constraint * Fix test case where insertion event is already in the normal DAG * Remove debug changes * Switch to chunk events so we can auth via power_levels Previously, we were using `content.chunk_id` to connect one chunk to another. But these events can be from any `sender` and we can't tell who should be able to send historical events. We know we only want the application service to do it but these events have the sender of a real historical message, not the application service user ID as the sender. Other federated homeservers also have no indicator which senders are an application service on the originating homeserver. So we want to auth all of the MSC2716 events via power_levels and have them be sent by the application service with proper PL levels in the room. * Switch to chunk events for federation * Add unstable room version to support new historical PL * Fix federated events being rejected for no state_groups Add fix from https://github.com/matrix-org/synapse/pull/10439 until it merges. * Only connect base insertion event to prev_event_ids Per discussion with @erikjohnston, https://matrix.to/#/!UytJQHLQYfvYWsGrGY:jki.re/$12bTUiObDFdHLAYtT7E-BvYRp3k_xv8w0dUQHibasJk?via=jki.re&via=matrix.org * Make it possible to get the room_version with txn * Allow but ignore historical events in unsupported room version See https://github.com/matrix-org/synapse/pull/10245#discussion_r675592489 We can't reject historical events on unsupported room versions because homeservers without knowledge of MSC2716 or the new room version don't reject historical events either. Since we can't rely on the auth check here to stop historical events on unsupported room versions, I've added some additional checks in the processing/persisting code (`synapse/storage/databases/main/events.py` -> `_handle_insertion_event` and `_handle_chunk_event`). I've had to do some refactoring so there is method to fetch the room version by `txn`. * Move to unique index syntax See https://github.com/matrix-org/synapse/pull/10245#discussion_r675638509 * High-level document how the insertion->chunk lookup works * Remove create_event fallback for room_versions See https://github.com/matrix-org/synapse/pull/10245/files#r677641879 * Use updated method name
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if room_version.msc2716_historical:
add_fields("historical")
elif event_type == EventTypes.Aliases and room_version.special_case_aliases_auth:
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add_fields("aliases")
elif event_type == EventTypes.RoomHistoryVisibility:
add_fields("history_visibility")
elif event_type == EventTypes.Redaction and room_version.msc2176_redaction_rules:
add_fields("redacts")
elif room_version.msc2716_redactions and event_type == EventTypes.MSC2716_INSERTION:
add_fields(EventContentFields.MSC2716_NEXT_BATCH_ID)
elif room_version.msc2716_redactions and event_type == EventTypes.MSC2716_BATCH:
add_fields(EventContentFields.MSC2716_BATCH_ID)
elif room_version.msc2716_redactions and event_type == EventTypes.MSC2716_MARKER:
add_fields(EventContentFields.MSC2716_MARKER_INSERTION)
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allowed_fields = {k: v for k, v in event_dict.items() if k in allowed_keys}
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allowed_fields["content"] = new_content
unsigned: JsonDict = {}
allowed_fields["unsigned"] = unsigned
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event_unsigned = event_dict.get("unsigned", {})
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if "age_ts" in event_unsigned:
unsigned["age_ts"] = event_unsigned["age_ts"]
if "replaces_state" in event_unsigned:
unsigned["replaces_state"] = event_unsigned["replaces_state"]
return allowed_fields
def _copy_field(src: JsonDict, dst: JsonDict, field: List[str]) -> None:
"""Copy the field in 'src' to 'dst'.
For example, if src={"foo":{"bar":5}} and dst={}, and field=["foo","bar"]
then dst={"foo":{"bar":5}}.
Args:
src: The dict to read from.
dst: The dict to modify.
field: List of keys to drill down to in 'src'.
"""
if len(field) == 0: # this should be impossible
return
if len(field) == 1: # common case e.g. 'origin_server_ts'
if field[0] in src:
dst[field[0]] = src[field[0]]
return
# Else is a nested field e.g. 'content.body'
# Pop the last field as that's the key to move across and we need the
# parent dict in order to access the data. Drill down to the right dict.
key_to_move = field.pop(-1)
sub_dict = src
for sub_field in field: # e.g. sub_field => "content"
if sub_field in sub_dict and isinstance(
sub_dict[sub_field], collections.abc.Mapping
):
sub_dict = sub_dict[sub_field]
else:
return
if key_to_move not in sub_dict:
return
# Insert the key into the output dictionary, creating nested objects
# as required. We couldn't do this any earlier or else we'd need to delete
# the empty objects if the key didn't exist.
sub_out_dict = dst
for sub_field in field:
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sub_out_dict = sub_out_dict.setdefault(sub_field, {})
sub_out_dict[key_to_move] = sub_dict[key_to_move]
def only_fields(dictionary: JsonDict, fields: List[str]) -> JsonDict:
"""Return a new dict with only the fields in 'dictionary' which are present
in 'fields'.
If there are no event fields specified then all fields are included.
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The entries may include '.' characters to indicate sub-fields.
So ['content.body'] will include the 'body' field of the 'content' object.
A literal '.' character in a field name may be escaped using a '\'.
Args:
dictionary: The dictionary to read from.
fields: A list of fields to copy over. Only shallow refs are
taken.
Returns:
A new dictionary with only the given fields. If fields was empty,
the same dictionary is returned.
"""
if len(fields) == 0:
return dictionary
# for each field, convert it:
# ["content.body.thing\.with\.dots"] => [["content", "body", "thing\.with\.dots"]]
split_fields = [SPLIT_FIELD_REGEX.split(f) for f in fields]
# for each element of the output array of arrays:
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# remove escaping so we can use the right key names.
split_fields[:] = [
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[f.replace(r"\.", r".") for f in field_array] for field_array in split_fields
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]
output: JsonDict = {}
for field_array in split_fields:
_copy_field(dictionary, output, field_array)
return output
def format_event_raw(d: JsonDict) -> JsonDict:
return d
def format_event_for_client_v1(d: JsonDict) -> JsonDict:
d = format_event_for_client_v2(d)
sender = d.get("sender")
if sender is not None:
d["user_id"] = sender
copy_keys = (
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"age",
"redacted_because",
"replaces_state",
"prev_content",
"invite_room_state",
"knock_room_state",
)
for key in copy_keys:
if key in d["unsigned"]:
d[key] = d["unsigned"][key]
return d
def format_event_for_client_v2(d: JsonDict) -> JsonDict:
drop_keys = (
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"auth_events",
"prev_events",
"hashes",
"signatures",
"depth",
"origin",
"prev_state",
)
for key in drop_keys:
d.pop(key, None)
return d
def format_event_for_client_v2_without_room_id(d: JsonDict) -> JsonDict:
d = format_event_for_client_v2(d)
d.pop("room_id", None)
return d
@attr.s(slots=True, frozen=True, auto_attribs=True)
class SerializeEventConfig:
as_client_event: bool = True
# Function to convert from federation format to client format
event_format: Callable[[JsonDict], JsonDict] = format_event_for_client_v1
# ID of the user's auth token - used for namespacing of transaction IDs
token_id: Optional[int] = None
# List of event fields to include. If empty, all fields will be returned.
only_event_fields: Optional[List[str]] = None
# Some events can have stripped room state stored in the `unsigned` field.
# This is required for invite and knock functionality. If this option is
# False, that state will be removed from the event before it is returned.
# Otherwise, it will be kept.
include_stripped_room_state: bool = False
_DEFAULT_SERIALIZE_EVENT_CONFIG = SerializeEventConfig()
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def serialize_event(
e: Union[JsonDict, EventBase],
time_now_ms: int,
*,
config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
) -> JsonDict:
"""Serialize event for clients
Args:
e
time_now_ms
config: Event serialization config
Returns:
The serialized event dictionary.
"""
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# FIXME(erikj): To handle the case of presence events and the like
if not isinstance(e, EventBase):
return e
time_now_ms = int(time_now_ms)
# Should this strip out None's?
d = {k: v for k, v in e.get_dict().items()}
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d["event_id"] = e.event_id
if "age_ts" in d["unsigned"]:
d["unsigned"]["age"] = time_now_ms - d["unsigned"]["age_ts"]
del d["unsigned"]["age_ts"]
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if "redacted_because" in e.unsigned:
d["unsigned"]["redacted_because"] = serialize_event(
e.unsigned["redacted_because"], time_now_ms, config=config
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)
if config.token_id is not None:
if config.token_id == getattr(e.internal_metadata, "token_id", None):
txn_id = getattr(e.internal_metadata, "txn_id", None)
if txn_id is not None:
d["unsigned"]["transaction_id"] = txn_id
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# invite_room_state and knock_room_state are a list of stripped room state events
# that are meant to provide metadata about a room to an invitee/knocker. They are
# intended to only be included in specific circumstances, such as down sync, and
# should not be included in any other case.
if not config.include_stripped_room_state:
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d["unsigned"].pop("invite_room_state", None)
d["unsigned"].pop("knock_room_state", None)
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if config.as_client_event:
d = config.event_format(d)
only_event_fields = config.only_event_fields
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if only_event_fields:
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if not isinstance(only_event_fields, list) or not all(
isinstance(f, str) for f in only_event_fields
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):
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raise TypeError("only_event_fields must be a list of strings")
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d = only_fields(d, only_event_fields)
return d
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class EventClientSerializer:
"""Serializes events that are to be sent to clients.
This is used for bundling extra information with any events to be sent to
clients.
"""
def serialize_event(
self,
event: Union[JsonDict, EventBase],
time_now: int,
*,
config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
apply_edits: bool = True,
) -> JsonDict:
"""Serializes a single event.
Args:
event: The event being serialized.
time_now: The current time in milliseconds
config: Event serialization config
bundle_aggregations: A map from event_id to the aggregations to be bundled
into the event.
apply_edits: Whether the content of the event should be modified to reflect
any replacement in `bundle_aggregations[<event_id>].replace`.
Returns:
The serialized event
"""
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# To handle the case of presence events and the like
if not isinstance(event, EventBase):
return event
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serialized_event = serialize_event(event, time_now, config=config)
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# Check if there are any bundled aggregations to include with the event.
if bundle_aggregations:
if event.event_id in bundle_aggregations:
self._inject_bundled_aggregations(
event,
time_now,
config,
bundle_aggregations,
serialized_event,
apply_edits=apply_edits,
)
return serialized_event
def _apply_edit(
self, orig_event: EventBase, serialized_event: JsonDict, edit: EventBase
) -> None:
"""Replace the content, preserving existing relations of the serialized event.
Args:
orig_event: The original event.
serialized_event: The original event, serialized. This is modified.
edit: The event which edits the above.
"""
# Ensure we take copies of the edit content, otherwise we risk modifying
# the original event.
edit_content = edit.content.copy()
# Unfreeze the event content if necessary, so that we may modify it below
edit_content = unfreeze(edit_content)
serialized_event["content"] = edit_content.get("m.new_content", {})
# Check for existing relations
relates_to = orig_event.content.get("m.relates_to")
if relates_to:
# Keep the relations, ensuring we use a dict copy of the original
serialized_event["content"]["m.relates_to"] = relates_to.copy()
else:
serialized_event["content"].pop("m.relates_to", None)
def _inject_bundled_aggregations(
self,
event: EventBase,
time_now: int,
config: SerializeEventConfig,
bundled_aggregations: Dict[str, "BundledAggregations"],
serialized_event: JsonDict,
apply_edits: bool,
) -> None:
"""Potentially injects bundled aggregations into the unsigned portion of the serialized event.
Args:
event: The event being serialized.
time_now: The current time in milliseconds
config: Event serialization config
bundled_aggregations: Bundled aggregations to be injected.
A map from event_id to aggregation data. Must contain at least an
entry for `event`.
While serializing the bundled aggregations this map may be searched
again for additional events in a recursive manner.
serialized_event: The serialized event which may be modified.
apply_edits: Whether the content of the event should be modified to reflect
any replacement in `aggregations.replace`.
"""
# We have already checked that aggregations exist for this event.
event_aggregations = bundled_aggregations[event.event_id]
# The JSON dictionary to be added under the unsigned property of the event
# being serialized.
serialized_aggregations = {}
if event_aggregations.annotations:
serialized_aggregations[
RelationTypes.ANNOTATION
] = event_aggregations.annotations
if event_aggregations.references:
serialized_aggregations[
RelationTypes.REFERENCE
] = event_aggregations.references
if event_aggregations.replace:
# If there is an edit, optionally apply it to the event.
edit = event_aggregations.replace
if apply_edits:
self._apply_edit(event, serialized_event, edit)
# Include information about it in the relations dict.
serialized_aggregations[RelationTypes.REPLACE] = {
"event_id": edit.event_id,
"origin_server_ts": edit.origin_server_ts,
"sender": edit.sender,
}
# Include any threaded replies to this event.
if event_aggregations.thread:
thread = event_aggregations.thread
serialized_latest_event = self.serialize_event(
thread.latest_event,
time_now,
config=config,
bundle_aggregations=bundled_aggregations,
)
thread_summary = {
"latest_event": serialized_latest_event,
"count": thread.count,
"current_user_participated": thread.current_user_participated,
}
serialized_aggregations[RelationTypes.THREAD] = thread_summary
# Include the bundled aggregations in the event.
if serialized_aggregations:
# There is likely already an "unsigned" field, but a filter might
# have stripped it off (via the event_fields option). The server is
# allowed to return additional fields, so add it back.
serialized_event.setdefault("unsigned", {}).setdefault(
"m.relations", {}
).update(serialized_aggregations)
def serialize_events(
self,
events: Iterable[Union[JsonDict, EventBase]],
time_now: int,
*,
config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
) -> List[JsonDict]:
"""Serializes multiple events.
Args:
event
time_now: The current time in milliseconds
config: Event serialization config
bundle_aggregations: Whether to include the bundled aggregations for this
event. Only applies to non-state events. (State events never include
bundled aggregations.)
Returns:
The list of serialized events
"""
return [
self.serialize_event(
event,
time_now,
config=config,
bundle_aggregations=bundle_aggregations,
)
for event in events
]
_PowerLevel = Union[str, int]
def copy_and_fixup_power_levels_contents(
old_power_levels: Mapping[str, Union[_PowerLevel, Mapping[str, _PowerLevel]]]
) -> Dict[str, Union[int, Dict[str, int]]]:
"""Copy the content of a power_levels event, unfreezing frozendicts along the way.
We accept as input power level values which are strings, provided they represent an
integer, e.g. `"`100"` instead of 100. Such strings are converted to integers
in the returned dictionary (hence "fixup" in the function name).
Note that future room versions will outlaw such stringy power levels (see
https://github.com/matrix-org/matrix-spec/issues/853).
Raises:
TypeError if the input does not look like a valid power levels event content
"""
if not isinstance(old_power_levels, collections.abc.Mapping):
raise TypeError("Not a valid power-levels content: %r" % (old_power_levels,))
power_levels: Dict[str, Union[int, Dict[str, int]]] = {}
for k, v in old_power_levels.items():
if isinstance(v, collections.abc.Mapping):
h: Dict[str, int] = {}
power_levels[k] = h
for k1, v1 in v.items():
_copy_power_level_value_as_integer(v1, h, k1)
else:
_copy_power_level_value_as_integer(v, power_levels, k)
return power_levels
def _copy_power_level_value_as_integer(
old_value: object,
power_levels: MutableMapping[str, Any],
key: str,
) -> None:
"""Set `power_levels[key]` to the integer represented by `old_value`.
:raises TypeError: if `old_value` is not an integer, nor a base-10 string
representation of an integer.
"""
if isinstance(old_value, int):
power_levels[key] = old_value
return
if isinstance(old_value, str):
try:
parsed_value = int(old_value, base=10)
except ValueError:
# Fall through to the final TypeError.
pass
else:
power_levels[key] = parsed_value
return
raise TypeError(f"Invalid power_levels value for {key}: {old_value}")
def validate_canonicaljson(value: Any) -> None:
"""
Ensure that the JSON object is valid according to the rules of canonical JSON.
See the appendix section 3.1: Canonical JSON.
This rejects JSON that has:
* An integer outside the range of [-2 ^ 53 + 1, 2 ^ 53 - 1]
* Floats
* NaN, Infinity, -Infinity
"""
if isinstance(value, int):
if value < CANONICALJSON_MIN_INT or CANONICALJSON_MAX_INT < value:
raise SynapseError(400, "JSON integer out of range", Codes.BAD_JSON)
elif isinstance(value, float):
# Note that Infinity, -Infinity, and NaN are also considered floats.
raise SynapseError(400, "Bad JSON value: float", Codes.BAD_JSON)
elif isinstance(value, collections.abc.Mapping):
for v in value.values():
validate_canonicaljson(v)
elif isinstance(value, (list, tuple)):
for i in value:
validate_canonicaljson(i)
elif not isinstance(value, (bool, str)) and value is not None:
# Other potential JSON values (bool, None, str) are safe.
raise SynapseError(400, "Unknown JSON value", Codes.BAD_JSON)