MatrixSynapse/synapse/appservice/__init__.py

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# Copyright 2015, 2016 OpenMarket 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.
import logging
import re
from enum import Enum
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Pattern
import attr
from netaddr import IPSet
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from synapse.api.constants import EventTypes
from synapse.events import EventBase
from synapse.types import GroupID, JsonDict, UserID, get_domain_from_id
from synapse.util.caches.descriptors import _CacheContext, cached
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if TYPE_CHECKING:
from synapse.appservice.api import ApplicationServiceApi
from synapse.storage.databases.main import DataStore
logger = logging.getLogger(__name__)
class ApplicationServiceState(Enum):
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DOWN = "down"
UP = "up"
@attr.s(slots=True, frozen=True, auto_attribs=True)
class Namespace:
exclusive: bool
group_id: Optional[str]
regex: Pattern[str]
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class ApplicationService:
"""Defines an application service. This definition is mostly what is
provided to the /register AS API.
Provides methods to check if this service is "interested" in events.
"""
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NS_USERS = "users"
NS_ALIASES = "aliases"
NS_ROOMS = "rooms"
# The ordering here is important as it is used to map database values (which
# are stored as ints representing the position in this list) to namespace
# values.
NS_LIST = [NS_USERS, NS_ALIASES, NS_ROOMS]
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def __init__(
self,
token: str,
hostname: str,
id: str,
sender: str,
url: Optional[str] = None,
namespaces: Optional[JsonDict] = None,
hs_token: Optional[str] = None,
protocols: Optional[Iterable[str]] = None,
rate_limited: bool = True,
ip_range_whitelist: Optional[IPSet] = None,
supports_ephemeral: bool = False,
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):
self.token = token
self.url = (
url.rstrip("/") if isinstance(url, str) else None
) # url must not end with a slash
self.hs_token = hs_token
self.sender = sender
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self.server_name = hostname
self.namespaces = self._check_namespaces(namespaces)
self.id = id
self.ip_range_whitelist = ip_range_whitelist
self.supports_ephemeral = supports_ephemeral
if "|" in self.id:
raise Exception("application service ID cannot contain '|' character")
# .protocols is a publicly visible field
if protocols:
self.protocols = set(protocols)
else:
self.protocols = set()
self.rate_limited = rate_limited
def _check_namespaces(
self, namespaces: Optional[JsonDict]
) -> Dict[str, List[Namespace]]:
# Sanity check that it is of the form:
# {
# users: [ {regex: "[A-z]+.*", exclusive: true}, ...],
# aliases: [ {regex: "[A-z]+.*", exclusive: true}, ...],
# rooms: [ {regex: "[A-z]+.*", exclusive: true}, ...],
# }
if namespaces is None:
namespaces = {}
result: Dict[str, List[Namespace]] = {}
for ns in ApplicationService.NS_LIST:
result[ns] = []
if ns not in namespaces:
continue
if not isinstance(namespaces[ns], list):
raise ValueError("Bad namespace value for '%s'" % ns)
for regex_obj in namespaces[ns]:
if not isinstance(regex_obj, dict):
raise ValueError("Expected dict regex for ns '%s'" % ns)
exclusive = regex_obj.get("exclusive")
if not isinstance(exclusive, bool):
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raise ValueError("Expected bool for 'exclusive' in ns '%s'" % ns)
group_id = regex_obj.get("group_id")
if group_id:
if not isinstance(group_id, str):
raise ValueError(
"Expected string for 'group_id' in ns '%s'" % ns
)
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try:
GroupID.from_string(group_id)
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except Exception:
raise ValueError(
"Expected valid group ID for 'group_id' in ns '%s'" % ns
)
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")
if not isinstance(regex, str):
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raise ValueError("Expected string for 'regex' in ns '%s'" % ns)
# Pre-compile regex.
result[ns].append(Namespace(exclusive, group_id, re.compile(regex)))
return result
def _matches_regex(
self, namespace_key: str, test_string: str
) -> Optional[Namespace]:
for namespace in self.namespaces[namespace_key]:
if namespace.regex.match(test_string):
return namespace
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return None
def _is_exclusive(self, namespace_key: str, test_string: str) -> bool:
namespace = self._matches_regex(namespace_key, test_string)
if namespace:
return namespace.exclusive
return False
async def _matches_user(
self, event: Optional[EventBase], store: Optional["DataStore"] = None
) -> bool:
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if not event:
return False
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if self.is_interested_in_user(event.sender):
return True
# also check m.room.member state key
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if event.type == EventTypes.Member and self.is_interested_in_user(
event.state_key
):
return True
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if not store:
return False
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does_match = await self.matches_user_in_member_list(event.room_id, store)
return does_match
@cached(num_args=1, cache_context=True)
async def matches_user_in_member_list(
self,
room_id: str,
store: "DataStore",
cache_context: _CacheContext,
) -> bool:
"""Check if this service is interested a room based upon it's membership
Args:
room_id: The room to check.
store: The datastore to query.
Returns:
True if this service would like to know about this room.
"""
member_list = await store.get_users_in_room(
room_id, on_invalidate=cache_context.invalidate
)
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# check joined member events
for user_id in member_list:
if self.is_interested_in_user(user_id):
return True
return False
def _matches_room_id(self, event: EventBase) -> bool:
if hasattr(event, "room_id"):
return self.is_interested_in_room(event.room_id)
return False
async def _matches_aliases(
self, event: EventBase, store: Optional["DataStore"] = None
) -> bool:
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if not store or not event:
return False
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alias_list = await store.get_aliases_for_room(event.room_id)
for alias in alias_list:
if self.is_interested_in_alias(alias):
return True
return False
async def is_interested(
self, event: EventBase, store: Optional["DataStore"] = None
) -> bool:
"""Check if this service is interested in this event.
Args:
event: The event to check.
store: The datastore to query.
Returns:
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True if this service would like to know about this event.
"""
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# Do cheap checks first
if self._matches_room_id(event):
return True
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# This will check the namespaces first before
# checking the store, so should be run before _matches_aliases
if await self._matches_user(event, store):
return True
# This will check the store, so should be run last
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if await self._matches_aliases(event, store):
return True
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return False
@cached(num_args=1)
async def is_interested_in_presence(
self, user_id: UserID, store: "DataStore"
) -> bool:
"""Check if this service is interested a user's presence
Args:
user_id: The user to check.
store: The datastore to query.
Returns:
True if this service would like to know about presence for this user.
"""
# Find all the rooms the sender is in
if self.is_interested_in_user(user_id.to_string()):
return True
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
for room_id in room_ids:
if await self.matches_user_in_member_list(room_id, store):
return True
return False
def is_interested_in_user(self, user_id: str) -> bool:
return (
bool(self._matches_regex(ApplicationService.NS_USERS, user_id))
or user_id == self.sender
)
def is_interested_in_alias(self, alias: str) -> bool:
return bool(self._matches_regex(ApplicationService.NS_ALIASES, alias))
def is_interested_in_room(self, room_id: str) -> bool:
return bool(self._matches_regex(ApplicationService.NS_ROOMS, room_id))
def is_exclusive_user(self, user_id: str) -> bool:
return (
self._is_exclusive(ApplicationService.NS_USERS, user_id)
or user_id == self.sender
)
def is_interested_in_protocol(self, protocol: str) -> bool:
return protocol in self.protocols
def is_exclusive_alias(self, alias: str) -> bool:
return self._is_exclusive(ApplicationService.NS_ALIASES, alias)
def is_exclusive_room(self, room_id: str) -> bool:
return self._is_exclusive(ApplicationService.NS_ROOMS, room_id)
def get_exclusive_user_regexes(self) -> List[Pattern[str]]:
"""Get the list of regexes used to determine if a user is exclusively
registered by the AS
"""
return [
namespace.regex
for namespace in self.namespaces[ApplicationService.NS_USERS]
if namespace.exclusive
]
def get_groups_for_user(self, user_id: str) -> Iterable[str]:
"""Get the groups that this user is associated with by this AS
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Args:
user_id: The ID of the user.
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Returns:
An iterable that yields group_id strings.
"""
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return (
namespace.group_id
for namespace in self.namespaces[ApplicationService.NS_USERS]
if namespace.group_id and namespace.regex.match(user_id)
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)
def is_rate_limited(self) -> bool:
return self.rate_limited
def __str__(self) -> str:
# copy dictionary and redact token fields so they don't get logged
dict_copy = self.__dict__.copy()
dict_copy["token"] = "<redacted>"
dict_copy["hs_token"] = "<redacted>"
return "ApplicationService: %s" % (dict_copy,)
class AppServiceTransaction:
"""Represents an application service transaction."""
def __init__(
self,
service: ApplicationService,
id: int,
events: List[EventBase],
ephemeral: List[JsonDict],
):
self.service = service
self.id = id
self.events = events
self.ephemeral = ephemeral
async def send(self, as_api: "ApplicationServiceApi") -> bool:
"""Sends this transaction using the provided AS API interface.
Args:
as_api: The API to use to send.
Returns:
True if the transaction was sent.
"""
return await as_api.push_bulk(
service=self.service,
events=self.events,
ephemeral=self.ephemeral,
txn_id=self.id,
)
async def complete(self, store: "DataStore") -> None:
"""Completes this transaction as successful.
Marks this transaction ID on the application service and removes the
transaction contents from the database.
Args:
store: The database store to operate on.
"""
await store.complete_appservice_txn(service=self.service, txn_id=self.id)