361 lines
12 KiB
Python
361 lines
12 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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import logging
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import re
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from typing import TYPE_CHECKING, Iterable, List, Match, Optional
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from synapse.api.constants import EventTypes
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from synapse.events import EventBase
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from synapse.types import GroupID, JsonDict, UserID, get_domain_from_id
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from synapse.util.caches.descriptors import _CacheContext, cached
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if TYPE_CHECKING:
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from synapse.appservice.api import ApplicationServiceApi
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from synapse.storage.databases.main import DataStore
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logger = logging.getLogger(__name__)
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class ApplicationServiceState:
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DOWN = "down"
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UP = "up"
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class ApplicationService:
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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__(
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self,
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token,
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hostname,
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id,
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sender,
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url=None,
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namespaces=None,
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hs_token=None,
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protocols=None,
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rate_limited=True,
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ip_range_whitelist=None,
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supports_ephemeral=False,
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):
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self.token = token
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self.url = (
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url.rstrip("/") if isinstance(url, str) else None
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) # url must not end with a slash
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self.hs_token = hs_token
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self.sender = sender
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self.server_name = hostname
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self.namespaces = self._check_namespaces(namespaces)
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self.id = id
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self.ip_range_whitelist = ip_range_whitelist
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self.supports_ephemeral = supports_ephemeral
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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("Expected bool for 'exclusive' in ns '%s'" % ns)
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group_id = regex_obj.get("group_id")
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if group_id:
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if not isinstance(group_id, str):
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raise ValueError(
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"Expected string for 'group_id' in ns '%s'" % ns
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)
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try:
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GroupID.from_string(group_id)
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except Exception:
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raise ValueError(
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"Expected valid group ID for 'group_id' in ns '%s'" % ns
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)
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if get_domain_from_id(group_id) != self.server_name:
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raise ValueError(
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"Expected 'group_id' to be this host in ns '%s'" % ns
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)
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regex = regex_obj.get("regex")
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if isinstance(regex, str):
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regex_obj["regex"] = re.compile(regex) # Pre-compile regex
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else:
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raise ValueError("Expected string for 'regex' in ns '%s'" % ns)
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return namespaces
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def _matches_regex(self, test_string: str, namespace_key: str) -> Optional[Match]:
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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: str, test_string: str) -> bool:
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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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async def _matches_user(
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self, event: Optional[EventBase], store: Optional["DataStore"] = None
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) -> bool:
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if not event:
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return False
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if self.is_interested_in_user(event.sender):
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return True
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# also check m.room.member state key
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if event.type == EventTypes.Member and self.is_interested_in_user(
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event.state_key
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):
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return True
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if not store:
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return False
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does_match = await self.matches_user_in_member_list(event.room_id, store)
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return does_match
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@cached(num_args=1, cache_context=True)
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async def matches_user_in_member_list(
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self, room_id: str, store: "DataStore", cache_context: _CacheContext,
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) -> bool:
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"""Check if this service is interested a room based upon it's membership
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Args:
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room_id: The room to check.
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store: The datastore to query.
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Returns:
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True if this service would like to know about this room.
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"""
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member_list = await 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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return True
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return False
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def _matches_room_id(self, event: EventBase) -> bool:
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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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async def _matches_aliases(
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self, event: EventBase, store: Optional["DataStore"] = None
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) -> bool:
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if not store or not event:
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return False
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alias_list = await 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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return True
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return False
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async def is_interested(
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self, event: EventBase, store: Optional["DataStore"] = None
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) -> bool:
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"""Check if this service is interested in this event.
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Args:
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event: The event to check.
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store: The datastore to query.
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Returns:
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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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return True
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# This will check the namespaces first before
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# checking the store, so should be run before _matches_aliases
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if await self._matches_user(event, store):
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return True
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# This will check the store, so should be run last
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if await self._matches_aliases(event, store):
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return True
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return False
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@cached(num_args=1)
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async def is_interested_in_presence(
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self, user_id: UserID, store: "DataStore"
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) -> bool:
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"""Check if this service is interested a user's presence
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Args:
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user_id: The user to check.
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store: The datastore to query.
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Returns:
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True if this service would like to know about presence for this user.
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"""
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# Find all the rooms the sender is in
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if self.is_interested_in_user(user_id.to_string()):
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return True
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room_ids = await store.get_rooms_for_user(user_id.to_string())
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# Then find out if the appservice is interested in any of those rooms
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for room_id in room_ids:
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if await self.matches_user_in_member_list(room_id, store):
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return True
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return False
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def is_interested_in_user(self, user_id: str) -> bool:
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return (
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bool(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: str) -> bool:
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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: str) -> bool:
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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: str) -> bool:
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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: str) -> bool:
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return protocol in self.protocols
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def is_exclusive_alias(self, alias: str) -> bool:
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return self._is_exclusive(ApplicationService.NS_ALIASES, alias)
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def is_exclusive_room(self, room_id: str) -> bool:
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return self._is_exclusive(ApplicationService.NS_ROOMS, room_id)
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def get_exclusive_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 get_groups_for_user(self, user_id: str) -> Iterable[str]:
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"""Get the groups that this user is associated with by this AS
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Args:
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user_id: The ID of the user.
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Returns:
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An iterable that yields group_id strings.
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"""
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return (
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regex_obj["group_id"]
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for regex_obj in self.namespaces[ApplicationService.NS_USERS]
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if "group_id" in regex_obj and regex_obj["regex"].match(user_id)
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)
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def is_rate_limited(self) -> bool:
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return self.rate_limited
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def __str__(self):
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# copy dictionary and redact token fields so they don't get logged
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dict_copy = self.__dict__.copy()
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dict_copy["token"] = "<redacted>"
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dict_copy["hs_token"] = "<redacted>"
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return "ApplicationService: %s" % (dict_copy,)
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class AppServiceTransaction:
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"""Represents an application service transaction."""
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def __init__(
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self,
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service: ApplicationService,
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id: int,
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events: List[EventBase],
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ephemeral: List[JsonDict],
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):
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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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self.ephemeral = ephemeral
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async def send(self, as_api: "ApplicationServiceApi") -> bool:
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"""Sends this transaction using the provided AS API interface.
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Args:
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as_api: The API to use to send.
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Returns:
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True if the transaction was sent.
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"""
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return await as_api.push_bulk(
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service=self.service,
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events=self.events,
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ephemeral=self.ephemeral,
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txn_id=self.id,
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)
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async def complete(self, store: "DataStore") -> None:
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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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"""
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await store.complete_appservice_txn(service=self.service, txn_id=self.id)
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