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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2025 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
import logging
from typing import TYPE_CHECKING, Awaitable, Callable, List, Optional
import attr
from synapse.util.async_helpers import delay_cancellation
from synapse.util.metrics import Measure
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
@attr.s(auto_attribs=True)
class RatelimitOverride:
"""Represents a ratelimit being overridden."""
per_second: float
"""The number of actions that can be performed in a second. `0.0` means that ratelimiting is disabled."""
burst_count: int
"""How many actions that can be performed before being limited."""
GET_RATELIMIT_OVERRIDE_FOR_USER_CALLBACK = Callable[
[str, str], Awaitable[Optional[RatelimitOverride]]
]
class RatelimitModuleApiCallbacks:
def __init__(self, hs: "HomeServer") -> None:
self.clock = hs.get_clock()
self._get_ratelimit_override_for_user_callbacks: List[
GET_RATELIMIT_OVERRIDE_FOR_USER_CALLBACK
] = []
def register_callbacks(
self,
get_ratelimit_override_for_user: Optional[
GET_RATELIMIT_OVERRIDE_FOR_USER_CALLBACK
] = None,
) -> None:
"""Register callbacks from module for each hook."""
if get_ratelimit_override_for_user is not None:
self._get_ratelimit_override_for_user_callbacks.append(
get_ratelimit_override_for_user
)
async def get_ratelimit_override_for_user(
self, user_id: str, limiter_name: str
) -> Optional[RatelimitOverride]:
for callback in self._get_ratelimit_override_for_user_callbacks:
with Measure(self.clock, f"{callback.__module__}.{callback.__qualname__}"):
res: Optional[RatelimitOverride] = await delay_cancellation(
callback(user_id, limiter_name)
)
if res:
return res
return None
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