259 lines
8.5 KiB
Python
259 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 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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from synapse.api.constants import EventTypes
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from synapse.util.caches.descriptors import cachedInlineCallbacks
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from twisted.internet import defer
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import logging
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import re
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logger = logging.getLogger(__name__)
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class ApplicationServiceState(object):
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DOWN = "down"
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UP = "up"
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class AppServiceTransaction(object):
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"""Represents an application service transaction."""
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def __init__(self, service, id, events):
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self.service = service
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self.id = id
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self.events = events
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def send(self, as_api):
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"""Sends this transaction using the provided AS API interface.
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Args:
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as_api(ApplicationServiceApi): The API to use to send.
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Returns:
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A Deferred which resolves to True if the transaction was sent.
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"""
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return as_api.push_bulk(
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service=self.service,
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events=self.events,
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txn_id=self.id
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)
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def complete(self, store):
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"""Completes this transaction as successful.
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Marks this transaction ID on the application service and removes the
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transaction contents from the database.
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Args:
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store: The database store to operate on.
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Returns:
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A Deferred which resolves to True if the transaction was completed.
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"""
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return store.complete_appservice_txn(
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service=self.service,
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txn_id=self.id
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)
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class ApplicationService(object):
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"""Defines an application service. This definition is mostly what is
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provided to the /register AS API.
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Provides methods to check if this service is "interested" in events.
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"""
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NS_USERS = "users"
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NS_ALIASES = "aliases"
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NS_ROOMS = "rooms"
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# The ordering here is important as it is used to map database values (which
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# are stored as ints representing the position in this list) to namespace
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# values.
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NS_LIST = [NS_USERS, NS_ALIASES, NS_ROOMS]
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def __init__(self, token, url=None, namespaces=None, hs_token=None,
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sender=None, id=None, protocols=None, rate_limited=True):
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self.token = token
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self.url = url
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self.hs_token = hs_token
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self.sender = sender
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self.namespaces = self._check_namespaces(namespaces)
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self.id = id
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if "|" in self.id:
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raise Exception("application service ID cannot contain '|' character")
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# .protocols is a publicly visible field
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if protocols:
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self.protocols = set(protocols)
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else:
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self.protocols = set()
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self.rate_limited = rate_limited
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def _check_namespaces(self, namespaces):
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# Sanity check that it is of the form:
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# {
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# users: [ {regex: "[A-z]+.*", exclusive: true}, ...],
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# aliases: [ {regex: "[A-z]+.*", exclusive: true}, ...],
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# rooms: [ {regex: "[A-z]+.*", exclusive: true}, ...],
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# }
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if not namespaces:
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namespaces = {}
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for ns in ApplicationService.NS_LIST:
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if ns not in namespaces:
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namespaces[ns] = []
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continue
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if type(namespaces[ns]) != list:
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raise ValueError("Bad namespace value for '%s'" % ns)
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for regex_obj in namespaces[ns]:
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if not isinstance(regex_obj, dict):
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raise ValueError("Expected dict regex for ns '%s'" % ns)
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if not isinstance(regex_obj.get("exclusive"), bool):
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raise ValueError(
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"Expected bool for 'exclusive' in ns '%s'" % ns
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)
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regex = regex_obj.get("regex")
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if isinstance(regex, basestring):
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regex_obj["regex"] = re.compile(regex) # Pre-compile regex
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else:
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raise ValueError(
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"Expected string for 'regex' in ns '%s'" % ns
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)
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return namespaces
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def _matches_regex(self, test_string, namespace_key):
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for regex_obj in self.namespaces[namespace_key]:
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if regex_obj["regex"].match(test_string):
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return regex_obj
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return None
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def _is_exclusive(self, ns_key, test_string):
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regex_obj = self._matches_regex(test_string, ns_key)
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if regex_obj:
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return regex_obj["exclusive"]
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return False
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@defer.inlineCallbacks
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def _matches_user(self, event, store):
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if not event:
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defer.returnValue(False)
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if self.is_interested_in_user(event.sender):
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defer.returnValue(True)
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# also check m.room.member state key
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if (event.type == EventTypes.Member and
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self.is_interested_in_user(event.state_key)):
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defer.returnValue(True)
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if not store:
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defer.returnValue(False)
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does_match = yield self._matches_user_in_member_list(event.room_id, store)
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defer.returnValue(does_match)
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@cachedInlineCallbacks(num_args=1, cache_context=True)
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def _matches_user_in_member_list(self, room_id, store, cache_context):
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member_list = yield store.get_users_in_room(
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room_id, on_invalidate=cache_context.invalidate
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)
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# check joined member events
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for user_id in member_list:
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if self.is_interested_in_user(user_id):
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defer.returnValue(True)
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defer.returnValue(False)
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def _matches_room_id(self, event):
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if hasattr(event, "room_id"):
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return self.is_interested_in_room(event.room_id)
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return False
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@defer.inlineCallbacks
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def _matches_aliases(self, event, store):
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if not store or not event:
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defer.returnValue(False)
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alias_list = yield store.get_aliases_for_room(event.room_id)
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for alias in alias_list:
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if self.is_interested_in_alias(alias):
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defer.returnValue(True)
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defer.returnValue(False)
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@defer.inlineCallbacks
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def is_interested(self, event, store=None):
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"""Check if this service is interested in this event.
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Args:
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event(Event): The event to check.
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store(DataStore)
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Returns:
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bool: True if this service would like to know about this event.
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"""
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# Do cheap checks first
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if self._matches_room_id(event):
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defer.returnValue(True)
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if (yield self._matches_aliases(event, store)):
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defer.returnValue(True)
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if (yield self._matches_user(event, store)):
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defer.returnValue(True)
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defer.returnValue(False)
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def is_interested_in_user(self, user_id):
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return (
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self._matches_regex(user_id, ApplicationService.NS_USERS)
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or user_id == self.sender
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)
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def is_interested_in_alias(self, alias):
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return bool(self._matches_regex(alias, ApplicationService.NS_ALIASES))
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def is_interested_in_room(self, room_id):
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return bool(self._matches_regex(room_id, ApplicationService.NS_ROOMS))
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def is_exclusive_user(self, user_id):
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return (
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self._is_exclusive(ApplicationService.NS_USERS, user_id)
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or user_id == self.sender
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)
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def is_interested_in_protocol(self, protocol):
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return protocol in self.protocols
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def is_exclusive_alias(self, alias):
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return self._is_exclusive(ApplicationService.NS_ALIASES, alias)
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def is_exclusive_room(self, room_id):
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return self._is_exclusive(ApplicationService.NS_ROOMS, room_id)
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def get_exlusive_user_regexes(self):
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"""Get the list of regexes used to determine if a user is exclusively
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registered by the AS
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"""
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return [
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regex_obj["regex"]
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for regex_obj in self.namespaces[ApplicationService.NS_USERS]
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if regex_obj["exclusive"]
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]
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def is_rate_limited(self):
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return self.rate_limited
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def __str__(self):
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return "ApplicationService: %s" % (self.__dict__,)
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