527 lines
16 KiB
Python
527 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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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 re
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import string
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import sys
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from collections import namedtuple
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from typing import Any, Dict, Tuple, TypeVar
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import attr
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from signedjson.key import decode_verify_key_bytes
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from unpaddedbase64 import decode_base64
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from synapse.api.errors import SynapseError
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# define a version of typing.Collection that works on python 3.5
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if sys.version_info[:3] >= (3, 6, 0):
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from typing import Collection
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else:
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from typing import Sized, Iterable, Container
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T_co = TypeVar("T_co", covariant=True)
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class Collection(Iterable[T_co], Container[T_co], Sized):
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__slots__ = ()
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# Define a state map type from type/state_key to T (usually an event ID or
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# event)
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T = TypeVar("T")
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StateMap = Dict[Tuple[str, str], T]
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# the type of a JSON-serialisable dict. This could be made stronger, but it will
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# do for now.
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JsonDict = Dict[str, Any]
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class Requester(
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namedtuple(
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"Requester", ["user", "access_token_id", "is_guest", "device_id", "app_service"]
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)
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):
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"""
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Represents the user making a request
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Attributes:
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user (UserID): id of the user making the request
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access_token_id (int|None): *ID* of the access token used for this
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request, or None if it came via the appservice API or similar
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is_guest (bool): True if the user making this request is a guest user
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device_id (str|None): device_id which was set at authentication time
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app_service (ApplicationService|None): the AS requesting on behalf of the user
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"""
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def serialize(self):
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"""Converts self to a type that can be serialized as JSON, and then
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deserialized by `deserialize`
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Returns:
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dict
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"""
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return {
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"user_id": self.user.to_string(),
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"access_token_id": self.access_token_id,
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"is_guest": self.is_guest,
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"device_id": self.device_id,
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"app_server_id": self.app_service.id if self.app_service else None,
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}
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@staticmethod
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def deserialize(store, input):
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"""Converts a dict that was produced by `serialize` back into a
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Requester.
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Args:
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store (DataStore): Used to convert AS ID to AS object
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input (dict): A dict produced by `serialize`
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Returns:
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Requester
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"""
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appservice = None
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if input["app_server_id"]:
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appservice = store.get_app_service_by_id(input["app_server_id"])
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return Requester(
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user=UserID.from_string(input["user_id"]),
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access_token_id=input["access_token_id"],
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is_guest=input["is_guest"],
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device_id=input["device_id"],
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app_service=appservice,
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)
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def create_requester(
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user_id, access_token_id=None, is_guest=False, device_id=None, app_service=None
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):
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"""
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Create a new ``Requester`` object
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Args:
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user_id (str|UserID): id of the user making the request
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access_token_id (int|None): *ID* of the access token used for this
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request, or None if it came via the appservice API or similar
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is_guest (bool): True if the user making this request is a guest user
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device_id (str|None): device_id which was set at authentication time
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app_service (ApplicationService|None): the AS requesting on behalf of the user
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Returns:
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Requester
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"""
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if not isinstance(user_id, UserID):
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user_id = UserID.from_string(user_id)
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return Requester(user_id, access_token_id, is_guest, device_id, app_service)
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def get_domain_from_id(string):
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idx = string.find(":")
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if idx == -1:
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raise SynapseError(400, "Invalid ID: %r" % (string,))
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return string[idx + 1 :]
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def get_localpart_from_id(string):
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idx = string.find(":")
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if idx == -1:
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raise SynapseError(400, "Invalid ID: %r" % (string,))
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return string[1:idx]
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class DomainSpecificString(namedtuple("DomainSpecificString", ("localpart", "domain"))):
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"""Common base class among ID/name strings that have a local part and a
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domain name, prefixed with a sigil.
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Has the fields:
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'localpart' : The local part of the name (without the leading sigil)
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'domain' : The domain part of the name
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"""
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# Deny iteration because it will bite you if you try to create a singleton
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# set by:
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# users = set(user)
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def __iter__(self):
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raise ValueError("Attempted to iterate a %s" % (type(self).__name__,))
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# Because this class is a namedtuple of strings and booleans, it is deeply
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# immutable.
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def __copy__(self):
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return self
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def __deepcopy__(self, memo):
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return self
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@classmethod
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def from_string(cls, s):
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"""Parse the string given by 's' into a structure object."""
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if len(s) < 1 or s[0:1] != cls.SIGIL:
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raise SynapseError(
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400, "Expected %s string to start with '%s'" % (cls.__name__, cls.SIGIL)
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)
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parts = s[1:].split(":", 1)
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if len(parts) != 2:
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raise SynapseError(
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400,
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"Expected %s of the form '%slocalname:domain'"
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% (cls.__name__, cls.SIGIL),
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)
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domain = parts[1]
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# This code will need changing if we want to support multiple domain
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# names on one HS
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return cls(localpart=parts[0], domain=domain)
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def to_string(self):
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"""Return a string encoding the fields of the structure object."""
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return "%s%s:%s" % (self.SIGIL, self.localpart, self.domain)
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@classmethod
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def is_valid(cls, s):
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try:
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cls.from_string(s)
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return True
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except Exception:
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return False
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__repr__ = to_string
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class UserID(DomainSpecificString):
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"""Structure representing a user ID."""
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SIGIL = "@"
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class RoomAlias(DomainSpecificString):
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"""Structure representing a room name."""
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SIGIL = "#"
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class RoomID(DomainSpecificString):
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"""Structure representing a room id. """
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SIGIL = "!"
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class EventID(DomainSpecificString):
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"""Structure representing an event id. """
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SIGIL = "$"
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class GroupID(DomainSpecificString):
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"""Structure representing a group ID."""
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SIGIL = "+"
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@classmethod
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def from_string(cls, s):
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group_id = super(GroupID, cls).from_string(s)
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if not group_id.localpart:
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raise SynapseError(400, "Group ID cannot be empty")
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if contains_invalid_mxid_characters(group_id.localpart):
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raise SynapseError(
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400, "Group ID can only contain characters a-z, 0-9, or '=_-./'"
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)
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return group_id
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mxid_localpart_allowed_characters = set(
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"_-./=" + string.ascii_lowercase + string.digits
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)
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def contains_invalid_mxid_characters(localpart):
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"""Check for characters not allowed in an mxid or groupid localpart
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Args:
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localpart (basestring): the localpart to be checked
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Returns:
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bool: True if there are any naughty characters
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"""
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return any(c not in mxid_localpart_allowed_characters for c in localpart)
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UPPER_CASE_PATTERN = re.compile(b"[A-Z_]")
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# the following is a pattern which matches '=', and bytes which are not allowed in a mxid
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# localpart.
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#
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# It works by:
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# * building a string containing the allowed characters (excluding '=')
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# * escaping every special character with a backslash (to stop '-' being interpreted as a
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# range operator)
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# * wrapping it in a '[^...]' regex
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# * converting the whole lot to a 'bytes' sequence, so that we can use it to match
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# bytes rather than strings
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#
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NON_MXID_CHARACTER_PATTERN = re.compile(
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("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters - {"="})),)).encode(
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"ascii"
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)
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)
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def map_username_to_mxid_localpart(username, case_sensitive=False):
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"""Map a username onto a string suitable for a MXID
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This follows the algorithm laid out at
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https://matrix.org/docs/spec/appendices.html#mapping-from-other-character-sets.
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Args:
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username (unicode|bytes): username to be mapped
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case_sensitive (bool): true if TEST and test should be mapped
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onto different mxids
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Returns:
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unicode: string suitable for a mxid localpart
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"""
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if not isinstance(username, bytes):
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username = username.encode("utf-8")
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# first we sort out upper-case characters
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if case_sensitive:
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def f1(m):
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return b"_" + m.group().lower()
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username = UPPER_CASE_PATTERN.sub(f1, username)
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else:
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username = username.lower()
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# then we sort out non-ascii characters
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def f2(m):
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g = m.group()[0]
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if isinstance(g, str):
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# on python 2, we need to do a ord(). On python 3, the
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# byte itself will do.
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g = ord(g)
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return b"=%02x" % (g,)
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username = NON_MXID_CHARACTER_PATTERN.sub(f2, username)
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# we also do the =-escaping to mxids starting with an underscore.
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username = re.sub(b"^_", b"=5f", username)
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# we should now only have ascii bytes left, so can decode back to a
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# unicode.
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return username.decode("ascii")
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class StreamToken(
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namedtuple(
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"Token",
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(
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"room_key",
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"presence_key",
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"typing_key",
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"receipt_key",
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"account_data_key",
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"push_rules_key",
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"to_device_key",
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"device_list_key",
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"groups_key",
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),
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)
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):
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_SEPARATOR = "_"
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START = None # type: StreamToken
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@classmethod
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def from_string(cls, string):
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try:
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keys = string.split(cls._SEPARATOR)
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while len(keys) < len(cls._fields):
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# i.e. old token from before receipt_key
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keys.append("0")
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return cls(*keys)
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except Exception:
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raise SynapseError(400, "Invalid Token")
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def to_string(self):
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return self._SEPARATOR.join([str(k) for k in self])
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@property
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def room_stream_id(self):
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# TODO(markjh): Awful hack to work around hacks in the presence tests
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# which assume that the keys are integers.
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if type(self.room_key) is int:
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return self.room_key
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else:
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return int(self.room_key[1:].split("-")[-1])
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def is_after(self, other):
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"""Does this token contain events that the other doesn't?"""
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return (
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(other.room_stream_id < self.room_stream_id)
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or (int(other.presence_key) < int(self.presence_key))
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or (int(other.typing_key) < int(self.typing_key))
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or (int(other.receipt_key) < int(self.receipt_key))
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or (int(other.account_data_key) < int(self.account_data_key))
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or (int(other.push_rules_key) < int(self.push_rules_key))
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or (int(other.to_device_key) < int(self.to_device_key))
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or (int(other.device_list_key) < int(self.device_list_key))
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or (int(other.groups_key) < int(self.groups_key))
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)
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def copy_and_advance(self, key, new_value):
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"""Advance the given key in the token to a new value if and only if the
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new value is after the old value.
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"""
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new_token = self.copy_and_replace(key, new_value)
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if key == "room_key":
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new_id = new_token.room_stream_id
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old_id = self.room_stream_id
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else:
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new_id = int(getattr(new_token, key))
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old_id = int(getattr(self, key))
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if old_id < new_id:
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return new_token
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else:
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return self
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def copy_and_replace(self, key, new_value):
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return self._replace(**{key: new_value})
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StreamToken.START = StreamToken(*(["s0"] + ["0"] * (len(StreamToken._fields) - 1)))
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class RoomStreamToken(namedtuple("_StreamToken", "topological stream")):
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"""Tokens are positions between events. The token "s1" comes after event 1.
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s0 s1
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[0] V [1] V [2]
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Tokens can either be a point in the live event stream or a cursor going
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through historic events.
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When traversing the live event stream events are ordered by when they
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arrived at the homeserver.
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When traversing historic events the events are ordered by their depth in
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the event graph "topological_ordering" and then by when they arrived at the
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homeserver "stream_ordering".
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Live tokens start with an "s" followed by the "stream_ordering" id of the
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event it comes after. Historic tokens start with a "t" followed by the
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"topological_ordering" id of the event it comes after, followed by "-",
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followed by the "stream_ordering" id of the event it comes after.
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"""
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__slots__ = [] # type: list
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@classmethod
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def parse(cls, string):
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try:
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if string[0] == "s":
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return cls(topological=None, stream=int(string[1:]))
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if string[0] == "t":
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parts = string[1:].split("-", 1)
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return cls(topological=int(parts[0]), stream=int(parts[1]))
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except Exception:
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pass
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raise SynapseError(400, "Invalid token %r" % (string,))
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@classmethod
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def parse_stream_token(cls, string):
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try:
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if string[0] == "s":
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return cls(topological=None, stream=int(string[1:]))
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except Exception:
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pass
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raise SynapseError(400, "Invalid token %r" % (string,))
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def __str__(self):
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if self.topological is not None:
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return "t%d-%d" % (self.topological, self.stream)
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else:
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return "s%d" % (self.stream,)
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class ThirdPartyInstanceID(
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namedtuple("ThirdPartyInstanceID", ("appservice_id", "network_id"))
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):
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# Deny iteration because it will bite you if you try to create a singleton
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# set by:
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# users = set(user)
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def __iter__(self):
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raise ValueError("Attempted to iterate a %s" % (type(self).__name__,))
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# Because this class is a namedtuple of strings, it is deeply immutable.
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def __copy__(self):
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return self
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def __deepcopy__(self, memo):
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return self
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@classmethod
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def from_string(cls, s):
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bits = s.split("|", 2)
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if len(bits) != 2:
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raise SynapseError(400, "Invalid ID %r" % (s,))
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return cls(appservice_id=bits[0], network_id=bits[1])
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def to_string(self):
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return "%s|%s" % (self.appservice_id, self.network_id)
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__str__ = to_string
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@classmethod
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def create(cls, appservice_id, network_id):
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return cls(appservice_id=appservice_id, network_id=network_id)
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@attr.s(slots=True)
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class ReadReceipt(object):
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"""Information about a read-receipt"""
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room_id = attr.ib()
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receipt_type = attr.ib()
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user_id = attr.ib()
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event_ids = attr.ib()
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data = attr.ib()
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def get_verify_key_from_cross_signing_key(key_info):
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"""Get the key ID and signedjson verify key from a cross-signing key dict
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Args:
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key_info (dict): a cross-signing key dict, which must have a "keys"
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property that has exactly one item in it
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Returns:
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(str, VerifyKey): the key ID and verify key for the cross-signing key
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"""
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# make sure that exactly one key is provided
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if "keys" not in key_info:
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raise ValueError("Invalid key")
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keys = key_info["keys"]
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if len(keys) != 1:
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raise ValueError("Invalid key")
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# and return that one key
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for key_id, key_data in keys.items():
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return (key_id, decode_verify_key_bytes(key_id, decode_base64(key_data)))
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