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# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Callable, Dict, Optional
import attr
class EventFormatVersions:
"""This is an internal enum for tracking the version of the event format,
independently from the room version.
"""
V1 = 1 # $id:server event id format
V2 = 2 # MSC1659-style $hash event id format: introduced for room v3
V3 = 3 # MSC1884-style $hash format: introduced for room v4
KNOWN_EVENT_FORMAT_VERSIONS = {
EventFormatVersions.V1,
EventFormatVersions.V2,
EventFormatVersions.V3,
}
class StateResolutionVersions:
"""Enum to identify the state resolution algorithms"""
V1 = 1 # room v1 state res
V2 = 2 # MSC1442 state res: room v2 and later
class RoomDisposition:
STABLE = "stable"
UNSTABLE = "unstable"
@attr.s(slots=True, frozen=True)
class RoomVersion:
"""An object which describes the unique attributes of a room version."""
identifier = attr.ib(type=str) # the identifier for this version
disposition = attr.ib(type=str) # one of the RoomDispositions
event_format = attr.ib(type=int) # one of the EventFormatVersions
state_res = attr.ib(type=int) # one of the StateResolutionVersions
enforce_key_validity = attr.ib(type=bool)
# Before MSC2432, m.room.aliases had special auth rules and redaction rules
special_case_aliases_auth = attr.ib(type=bool)
# Strictly enforce canonicaljson, do not allow:
# * Integers outside the range of [-2 ^ 53 + 1, 2 ^ 53 - 1]
# * Floats
# * NaN, Infinity, -Infinity
strict_canonicaljson = attr.ib(type=bool)
# MSC2209: Check 'notifications' key while verifying
# m.room.power_levels auth rules.
limit_notifications_power_levels = attr.ib(type=bool)
# MSC2174/MSC2176: Apply updated redaction rules algorithm.
msc2176_redaction_rules = attr.ib(type=bool)
# MSC3083: Support the 'restricted' join_rule.
msc3083_join_rules = attr.ib(type=bool)
# MSC2403: Allows join_rules to be set to 'knock', changes auth rules to allow sending
# m.room.membership event with membership 'knock'.
msc2403_knocking = attr.ib(type=bool)
class RoomVersions:
V1 = RoomVersion(
"1",
RoomDisposition.STABLE,
EventFormatVersions.V1,
StateResolutionVersions.V1,
enforce_key_validity=False,
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
V2 = RoomVersion(
"2",
RoomDisposition.STABLE,
EventFormatVersions.V1,
StateResolutionVersions.V2,
enforce_key_validity=False,
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
V3 = RoomVersion(
"3",
RoomDisposition.STABLE,
EventFormatVersions.V2,
StateResolutionVersions.V2,
enforce_key_validity=False,
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
V4 = RoomVersion(
"4",
RoomDisposition.STABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=False,
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
V5 = RoomVersion(
"5",
RoomDisposition.STABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
V6 = RoomVersion(
"6",
RoomDisposition.STABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=False,
)
MSC2176 = RoomVersion(
"org.matrix.msc2176",
RoomDisposition.UNSTABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2176_redaction_rules=True,
msc3083_join_rules=False,
msc2403_knocking=False,
)
MSC3083 = RoomVersion(
"org.matrix.msc3083.v2",
RoomDisposition.UNSTABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc2403_knocking=False,
)
V7 = RoomVersion(
"7",
RoomDisposition.STABLE,
EventFormatVersions.V3,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc2403_knocking=True,
)
KNOWN_ROOM_VERSIONS: Dict[str, RoomVersion] = {
v.identifier: v
for v in (
RoomVersions.V1,
RoomVersions.V2,
RoomVersions.V3,
RoomVersions.V4,
RoomVersions.V5,
RoomVersions.V6,
RoomVersions.MSC2176,
RoomVersions.MSC3083,
RoomVersions.V7,
)
}
@attr.s(slots=True, frozen=True, auto_attribs=True)
class RoomVersionCapability:
"""An object which describes the unique attributes of a room version."""
identifier: str # the identifier for this capability
preferred_version: Optional[RoomVersion]
support_check_lambda: Callable[[RoomVersion], bool]
MSC3244_CAPABILITIES = {
cap.identifier: {
"preferred": cap.preferred_version.identifier
if cap.preferred_version is not None
else None,
"support": [
v.identifier
for v in KNOWN_ROOM_VERSIONS.values()
if cap.support_check_lambda(v)
],
}
for cap in (
RoomVersionCapability(
"knock",
RoomVersions.V7,
lambda room_version: room_version.msc2403_knocking,
),
RoomVersionCapability(
"restricted",
None,
lambda room_version: room_version.msc3083_join_rules,
),
)
}
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