115 lines
4.4 KiB
Python
115 lines
4.4 KiB
Python
# Copyright 2014 - 2016 OpenMarket 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 logging
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from typing import TYPE_CHECKING, Optional
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from synapse.api.ratelimiting import Ratelimiter
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class BaseHandler:
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"""
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Common base class for the event handlers.
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Deprecated: new code should not use this. Instead, Handler classes should define the
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fields they actually need. The utility methods should either be factored out to
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standalone helper functions, or to different Handler classes.
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"""
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.notifier = hs.get_notifier()
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self.state_handler = hs.get_state_handler()
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self.distributor = hs.get_distributor()
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self.clock = hs.get_clock()
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self.hs = hs
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# The rate_hz and burst_count are overridden on a per-user basis
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self.request_ratelimiter = Ratelimiter(
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store=self.store, clock=self.clock, rate_hz=0, burst_count=0
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)
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self._rc_message = self.hs.config.ratelimiting.rc_message
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# Check whether ratelimiting room admin message redaction is enabled
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# by the presence of rate limits in the config
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if self.hs.config.ratelimiting.rc_admin_redaction:
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self.admin_redaction_ratelimiter: Optional[Ratelimiter] = Ratelimiter(
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store=self.store,
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clock=self.clock,
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rate_hz=self.hs.config.ratelimiting.rc_admin_redaction.per_second,
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burst_count=self.hs.config.ratelimiting.rc_admin_redaction.burst_count,
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)
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else:
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self.admin_redaction_ratelimiter = None
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self.server_name = hs.hostname
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self.event_builder_factory = hs.get_event_builder_factory()
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async def ratelimit(self, requester, update=True, is_admin_redaction=False):
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"""Ratelimits requests.
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Args:
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requester (Requester)
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update (bool): Whether to record that a request is being processed.
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Set to False when doing multiple checks for one request (e.g.
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to check up front if we would reject the request), and set to
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True for the last call for a given request.
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is_admin_redaction (bool): Whether this is a room admin/moderator
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redacting an event. If so then we may apply different
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ratelimits depending on config.
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Raises:
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LimitExceededError if the request should be ratelimited
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"""
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user_id = requester.user.to_string()
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# The AS user itself is never rate limited.
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app_service = self.store.get_app_service_by_user_id(user_id)
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if app_service is not None:
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return # do not ratelimit app service senders
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messages_per_second = self._rc_message.per_second
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burst_count = self._rc_message.burst_count
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# Check if there is a per user override in the DB.
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override = await self.store.get_ratelimit_for_user(user_id)
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if override:
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# If overridden with a null Hz then ratelimiting has been entirely
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# disabled for the user
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if not override.messages_per_second:
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return
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messages_per_second = override.messages_per_second
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burst_count = override.burst_count
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if is_admin_redaction and self.admin_redaction_ratelimiter:
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# If we have separate config for admin redactions, use a separate
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# ratelimiter as to not have user_ids clash
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await self.admin_redaction_ratelimiter.ratelimit(requester, update=update)
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else:
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# Override rate and burst count per-user
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await self.request_ratelimiter.ratelimit(
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requester,
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rate_hz=messages_per_second,
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burst_count=burst_count,
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update=update,
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)
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