forked-synapse/synapse/handlers/register.py

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2016-01-05 13:01:18 -05:00
# Copyright 2014 - 2016 OpenMarket Ltd
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#
# 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.
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"""Contains functions for registering clients."""
import logging
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple
from prometheus_client import Counter
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from synapse import types
from synapse.api.constants import MAX_USERID_LENGTH, EventTypes, JoinRules, LoginType
from synapse.api.errors import AuthError, Codes, ConsentNotGivenError, SynapseError
from synapse.appservice import ApplicationService
from synapse.config.server import is_threepid_reserved
from synapse.http.servlet import assert_params_in_dict
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from synapse.replication.http.login import RegisterDeviceReplicationServlet
from synapse.replication.http.register import (
ReplicationPostRegisterActionsServlet,
ReplicationRegisterServlet,
)
from synapse.spam_checker_api import RegistrationBehaviour
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, UserID, create_requester
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from ._base import BaseHandler
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
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registration_counter = Counter(
"synapse_user_registrations_total",
"Number of new users registered (since restart)",
["guest", "shadow_banned", "auth_provider"],
)
login_counter = Counter(
"synapse_user_logins_total",
"Number of user logins (since restart)",
["guest", "auth_provider"],
)
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class RegistrationHandler(BaseHandler):
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.hs = hs
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self.auth = hs.get_auth()
self._auth_handler = hs.get_auth_handler()
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self.profile_handler = hs.get_profile_handler()
self.user_directory_handler = hs.get_user_directory_handler()
self.identity_handler = self.hs.get_identity_handler()
self.ratelimiter = hs.get_registration_ratelimiter()
self.macaroon_gen = hs.get_macaroon_generator()
self._server_notices_mxid = hs.config.server_notices_mxid
self._server_name = hs.hostname
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self.spam_checker = hs.get_spam_checker()
if hs.config.worker_app:
self._register_client = ReplicationRegisterServlet.make_client(hs)
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self._register_device_client = RegisterDeviceReplicationServlet.make_client(
hs
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)
self._post_registration_client = (
ReplicationPostRegisterActionsServlet.make_client(hs)
)
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else:
self.device_handler = hs.get_device_handler()
self._register_device_client = self.register_device_inner
self.pusher_pool = hs.get_pusherpool()
self.session_lifetime = hs.config.session_lifetime
async def check_username(
self,
localpart: str,
guest_access_token: Optional[str] = None,
assigned_user_id: Optional[str] = None,
):
if types.contains_invalid_mxid_characters(localpart):
raise SynapseError(
400,
"User ID can only contain characters a-z, 0-9, or '=_-./'",
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Codes.INVALID_USERNAME,
)
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if not localpart:
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raise SynapseError(400, "User ID cannot be empty", Codes.INVALID_USERNAME)
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if localpart[0] == "_":
raise SynapseError(
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400, "User ID may not begin with _", Codes.INVALID_USERNAME
)
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
if assigned_user_id:
if user_id == assigned_user_id:
return
else:
raise SynapseError(
400,
"A different user ID has already been registered for this session",
)
self.check_user_id_not_appservice_exclusive(user_id)
if len(user_id) > MAX_USERID_LENGTH:
raise SynapseError(
400,
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"User ID may not be longer than %s characters" % (MAX_USERID_LENGTH,),
Codes.INVALID_USERNAME,
)
users = await self.store.get_users_by_id_case_insensitive(user_id)
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if users:
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if not guest_access_token:
raise SynapseError(
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400, "User ID already taken.", errcode=Codes.USER_IN_USE
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)
user_data = await self.auth.get_user_by_access_token(guest_access_token)
if (
not user_data.is_guest
or UserID.from_string(user_data.user_id).localpart != localpart
):
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raise AuthError(
403,
"Cannot register taken user ID without valid guest "
"credentials for that user.",
errcode=Codes.FORBIDDEN,
)
if guest_access_token is None:
try:
int(localpart)
raise SynapseError(
400,
"Numeric user IDs are reserved for guest users.",
errcode=Codes.INVALID_USERNAME,
)
except ValueError:
pass
async def register_user(
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self,
localpart: Optional[str] = None,
password_hash: Optional[str] = None,
guest_access_token: Optional[str] = None,
make_guest: bool = False,
admin: bool = False,
threepid: Optional[dict] = None,
user_type: Optional[str] = None,
default_display_name: Optional[str] = None,
address: Optional[str] = None,
bind_emails: Optional[Iterable[str]] = None,
by_admin: bool = False,
user_agent_ips: Optional[List[Tuple[str, str]]] = None,
auth_provider_id: Optional[str] = None,
) -> str:
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"""Registers a new client on the server.
Args:
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localpart: The local part of the user ID to register. If None,
one will be generated.
password_hash: The hashed password to assign to this user so they can
login again. This can be None which means they cannot login again
via a password (e.g. the user is an application service user).
guest_access_token: The access token used when this was a guest
account.
make_guest: True if the the new user should be guest,
false to add a regular user account.
admin: True if the user should be registered as a server admin.
threepid: The threepid used for registering, if any.
user_type: type of user. One of the values from
api.constants.UserTypes, or None for a normal user.
default_display_name: if set, the new user's displayname
will be set to this. Defaults to 'localpart'.
address: the IP address used to perform the registration.
bind_emails: list of emails to bind to this account.
by_admin: True if this registration is being made via the
admin api, otherwise False.
user_agent_ips: Tuples of IP addresses and user-agents used
during the registration process.
auth_provider_id: The SSO IdP the user used, if any.
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Returns:
The registered user_id.
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Raises:
SynapseError if there was a problem registering.
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"""
bind_emails = bind_emails or []
await self.check_registration_ratelimit(address)
result = await self.spam_checker.check_registration_for_spam(
threepid,
localpart,
user_agent_ips or [],
auth_provider_id=auth_provider_id,
)
if result == RegistrationBehaviour.DENY:
logger.info(
"Blocked registration of %r",
localpart,
)
# We return a 429 to make it not obvious that they've been
# denied.
raise SynapseError(429, "Rate limited")
shadow_banned = result == RegistrationBehaviour.SHADOW_BAN
if shadow_banned:
logger.info(
"Shadow banning registration of %r",
localpart,
)
# do not check_auth_blocking if the call is coming through the Admin API
if not by_admin:
await self.auth.check_auth_blocking(threepid=threepid)
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if localpart is not None:
await self.check_username(localpart, guest_access_token=guest_access_token)
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was_guest = guest_access_token is not None
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
if was_guest:
# If the user was a guest then they already have a profile
default_display_name = None
elif default_display_name is None:
default_display_name = localpart
await self.register_with_store(
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user_id=user_id,
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password_hash=password_hash,
was_guest=was_guest,
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make_guest=make_guest,
create_profile_with_displayname=default_display_name,
admin=admin,
user_type=user_type,
address=address,
shadow_banned=shadow_banned,
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)
if self.hs.config.user_directory_search_all_users:
profile = await self.store.get_profileinfo(localpart)
await self.user_directory_handler.handle_local_profile_change(
user_id, profile
)
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else:
# autogen a sequential user ID
fail_count = 0
# If a default display name is not given, generate one.
generate_display_name = default_display_name is None
# This breaks on successful registration *or* errors after 10 failures.
while True:
# Fail after being unable to find a suitable ID a few times
if fail_count > 10:
raise SynapseError(500, "Unable to find a suitable guest user ID")
localpart = await self.store.generate_user_id()
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
self.check_user_id_not_appservice_exclusive(user_id)
if generate_display_name:
default_display_name = localpart
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try:
await self.register_with_store(
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user_id=user_id,
password_hash=password_hash,
make_guest=make_guest,
create_profile_with_displayname=default_display_name,
address=address,
shadow_banned=shadow_banned,
)
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# Successfully registered
break
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except SynapseError:
# if user id is taken, just generate another
fail_count += 1
registration_counter.labels(
guest=make_guest,
shadow_banned=shadow_banned,
auth_provider=(auth_provider_id or ""),
).inc()
if not self.hs.config.user_consent_at_registration:
if not self.hs.config.auto_join_rooms_for_guests and make_guest:
logger.info(
"Skipping auto-join for %s because auto-join for guests is disabled",
user_id,
)
else:
await self._auto_join_rooms(user_id)
else:
logger.info(
"Skipping auto-join for %s because consent is required at registration",
user_id,
)
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# Bind any specified emails to this account
current_time = self.hs.get_clock().time_msec()
for email in bind_emails:
# generate threepid dict
threepid_dict = {
"medium": "email",
"address": email,
"validated_at": current_time,
}
# Bind email to new account
await self._register_email_threepid(user_id, threepid_dict, None)
return user_id
async def _create_and_join_rooms(self, user_id: str) -> None:
"""
Create the auto-join rooms and join or invite the user to them.
This should only be called when the first "real" user registers.
Args:
user_id: The user to join
"""
# Getting the handlers during init gives a dependency loop.
room_creation_handler = self.hs.get_room_creation_handler()
room_member_handler = self.hs.get_room_member_handler()
# Generate a stub for how the rooms will be configured.
stub_config = {
"preset": self.hs.config.registration.autocreate_auto_join_room_preset,
}
# If the configuration providers a user ID to create rooms with, use
# that instead of the first user registered.
requires_join = False
if self.hs.config.registration.auto_join_user_id:
fake_requester = create_requester(
self.hs.config.registration.auto_join_user_id,
authenticated_entity=self._server_name,
)
# If the room requires an invite, add the user to the list of invites.
if self.hs.config.registration.auto_join_room_requires_invite:
stub_config["invite"] = [user_id]
# If the room is being created by a different user, the first user
# registered needs to join it. Note that in the case of an invitation
# being necessary this will occur after the invite was sent.
requires_join = True
else:
fake_requester = create_requester(
user_id, authenticated_entity=self._server_name
)
# Choose whether to federate the new room.
if not self.hs.config.registration.autocreate_auto_join_rooms_federated:
stub_config["creation_content"] = {"m.federate": False}
for r in self.hs.config.registration.auto_join_rooms:
logger.info("Auto-joining %s to %s", user_id, r)
try:
room_alias = RoomAlias.from_string(r)
if self.hs.hostname != room_alias.domain:
logger.warning(
"Cannot create room alias %s, "
"it does not match server domain",
r,
)
else:
# A shallow copy is OK here since the only key that is
# modified is room_alias_name.
config = stub_config.copy()
# create room expects the localpart of the room alias
config["room_alias_name"] = room_alias.localpart
info, _ = await room_creation_handler.create_room(
fake_requester,
config=config,
ratelimit=False,
)
# If the room does not require an invite, but another user
# created it, then ensure the first user joins it.
if requires_join:
await room_member_handler.update_membership(
requester=create_requester(
user_id, authenticated_entity=self._server_name
),
target=UserID.from_string(user_id),
room_id=info["room_id"],
# Since it was just created, there are no remote hosts.
remote_room_hosts=[],
action="join",
ratelimit=False,
)
except Exception as e:
logger.error("Failed to join new user to %r: %r", r, e)
async def _join_rooms(self, user_id: str) -> None:
"""
Join or invite the user to the auto-join rooms.
Args:
user_id: The user to join
"""
room_member_handler = self.hs.get_room_member_handler()
for r in self.hs.config.registration.auto_join_rooms:
logger.info("Auto-joining %s to %s", user_id, r)
try:
room_alias = RoomAlias.from_string(r)
if RoomAlias.is_valid(r):
(
room,
remote_room_hosts,
) = await room_member_handler.lookup_room_alias(room_alias)
room_id = room.to_string()
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else:
raise SynapseError(
400, "%s was not legal room ID or room alias" % (r,)
)
# Calculate whether the room requires an invite or can be
# joined directly. Note that unless a join rule of public exists,
# it is treated as requiring an invite.
requires_invite = True
state = await self.store.get_filtered_current_state_ids(
room_id, StateFilter.from_types([(EventTypes.JoinRules, "")])
)
event_id = state.get((EventTypes.JoinRules, ""))
if event_id:
join_rules_event = await self.store.get_event(
event_id, allow_none=True
)
if join_rules_event:
join_rule = join_rules_event.content.get("join_rule", None)
requires_invite = join_rule and join_rule != JoinRules.PUBLIC
# Send the invite, if necessary.
if requires_invite:
# If an invite is required, there must be a auto-join user ID.
assert self.hs.config.registration.auto_join_user_id
await room_member_handler.update_membership(
requester=create_requester(
self.hs.config.registration.auto_join_user_id,
authenticated_entity=self._server_name,
),
target=UserID.from_string(user_id),
room_id=room_id,
remote_room_hosts=remote_room_hosts,
action="invite",
ratelimit=False,
)
# Send the join.
await room_member_handler.update_membership(
requester=create_requester(
user_id, authenticated_entity=self._server_name
),
target=UserID.from_string(user_id),
room_id=room_id,
remote_room_hosts=remote_room_hosts,
action="join",
ratelimit=False,
)
except ConsentNotGivenError as e:
# Technically not necessary to pull out this error though
# moving away from bare excepts is a good thing to do.
logger.error("Failed to join new user to %r: %r", r, e)
except Exception as e:
logger.error("Failed to join new user to %r: %r", r, e)
async def _auto_join_rooms(self, user_id: str) -> None:
"""Automatically joins users to auto join rooms - creating the room in the first place
if the user is the first to be created.
Args:
user_id: The user to join
"""
# auto-join the user to any rooms we're supposed to dump them into
# try to create the room if we're the first real user on the server. Note
# that an auto-generated support or bot user is not a real user and will never be
# the user to create the room
should_auto_create_rooms = False
is_real_user = await self.store.is_real_user(user_id)
if self.hs.config.registration.autocreate_auto_join_rooms and is_real_user:
count = await self.store.count_real_users()
should_auto_create_rooms = count == 1
if should_auto_create_rooms:
await self._create_and_join_rooms(user_id)
else:
await self._join_rooms(user_id)
async def post_consent_actions(self, user_id: str) -> None:
"""A series of registration actions that can only be carried out once consent
has been granted
Args:
user_id: The user to join
"""
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await self._auto_join_rooms(user_id)
async def appservice_register(self, user_localpart: str, as_token: str) -> str:
user = UserID(user_localpart, self.hs.hostname)
user_id = user.to_string()
service = self.store.get_app_service_by_token(as_token)
if not service:
raise AuthError(403, "Invalid application service token.")
if not service.is_interested_in_user(user_id):
raise SynapseError(
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400,
"Invalid user localpart for this application service.",
errcode=Codes.EXCLUSIVE,
)
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service_id = service.id if service.is_exclusive_user(user_id) else None
self.check_user_id_not_appservice_exclusive(user_id, allowed_appservice=service)
await self.register_with_store(
user_id=user_id,
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password_hash="",
appservice_id=service_id,
create_profile_with_displayname=user.localpart,
)
return user_id
def check_user_id_not_appservice_exclusive(
self, user_id: str, allowed_appservice: Optional[ApplicationService] = None
) -> None:
# don't allow people to register the server notices mxid
if self._server_notices_mxid is not None:
if user_id == self._server_notices_mxid:
raise SynapseError(
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400, "This user ID is reserved.", errcode=Codes.EXCLUSIVE
)
# valid user IDs must not clash with any user ID namespaces claimed by
# application services.
services = self.store.get_app_services()
interested_services = [
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s
for s in services
if s.is_interested_in_user(user_id) and s != allowed_appservice
]
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for service in interested_services:
if service.is_exclusive_user(user_id):
raise SynapseError(
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400,
"This user ID is reserved by an application service.",
errcode=Codes.EXCLUSIVE,
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)
async def check_registration_ratelimit(self, address: Optional[str]) -> None:
"""A simple helper method to check whether the registration rate limit has been hit
for a given IP address
Args:
address: the IP address used to perform the registration. If this is
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None, no ratelimiting will be performed.
Raises:
LimitExceededError: If the rate limit has been exceeded.
"""
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if not address:
return
await self.ratelimiter.ratelimit(None, address)
async def register_with_store(
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self,
user_id: str,
password_hash: Optional[str] = None,
was_guest: bool = False,
make_guest: bool = False,
appservice_id: Optional[str] = None,
create_profile_with_displayname: Optional[str] = None,
admin: bool = False,
user_type: Optional[str] = None,
address: Optional[str] = None,
shadow_banned: bool = False,
) -> None:
"""Register user in the datastore.
Args:
user_id: The desired user ID to register.
password_hash: Optional. The password hash for this user.
was_guest: Optional. Whether this is a guest account being
upgraded to a non-guest account.
make_guest: True if the the new user should be guest,
false to add a regular user account.
appservice_id: The ID of the appservice registering the user.
create_profile_with_displayname: Optionally create a
profile for the user, setting their displayname to the given value
admin: is an admin user?
user_type: type of user. One of the values from
api.constants.UserTypes, or None for a normal user.
address: the IP address used to perform the registration.
shadow_banned: Whether to shadow-ban the user
"""
if self.hs.config.worker_app:
await self._register_client(
user_id=user_id,
password_hash=password_hash,
was_guest=was_guest,
make_guest=make_guest,
appservice_id=appservice_id,
create_profile_with_displayname=create_profile_with_displayname,
admin=admin,
user_type=user_type,
address=address,
shadow_banned=shadow_banned,
)
else:
await self.store.register_user(
user_id=user_id,
password_hash=password_hash,
was_guest=was_guest,
make_guest=make_guest,
appservice_id=appservice_id,
create_profile_with_displayname=create_profile_with_displayname,
admin=admin,
user_type=user_type,
shadow_banned=shadow_banned,
)
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async def register_device(
self,
user_id: str,
device_id: Optional[str],
initial_display_name: Optional[str],
is_guest: bool = False,
is_appservice_ghost: bool = False,
auth_provider_id: Optional[str] = None,
) -> Tuple[str, str]:
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"""Register a device for a user and generate an access token.
The access token will be limited by the homeserver's session_lifetime config.
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Args:
user_id: full canonical @user:id
device_id: The device ID to check, or None to generate a new one.
initial_display_name: An optional display name for the device.
is_guest: Whether this is a guest account
auth_provider_id: The SSO IdP the user used, if any (just used for the
prometheus metrics).
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Returns:
Tuple of device ID and access token
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"""
res = await self._register_device_client(
user_id=user_id,
device_id=device_id,
initial_display_name=initial_display_name,
is_guest=is_guest,
is_appservice_ghost=is_appservice_ghost,
)
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login_counter.labels(
guest=is_guest,
auth_provider=(auth_provider_id or ""),
).inc()
return res["device_id"], res["access_token"]
async def register_device_inner(
self,
user_id: str,
device_id: Optional[str],
initial_display_name: Optional[str],
is_guest: bool = False,
is_appservice_ghost: bool = False,
) -> Dict[str, str]:
"""Helper for register_device
Does the bits that need doing on the main process. Not for use outside this
class and RegisterDeviceReplicationServlet.
"""
assert not self.hs.config.worker_app
valid_until_ms = None
if self.session_lifetime is not None:
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if is_guest:
raise Exception(
"session_lifetime is not currently implemented for guest access"
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)
valid_until_ms = self.clock.time_msec() + self.session_lifetime
registered_device_id = await self.device_handler.check_device_registered(
user_id, device_id, initial_display_name
)
if is_guest:
assert valid_until_ms is None
access_token = self.macaroon_gen.generate_access_token(
user_id, ["guest = true"]
)
else:
access_token = await self._auth_handler.get_access_token_for_user_id(
user_id,
device_id=registered_device_id,
valid_until_ms=valid_until_ms,
is_appservice_ghost=is_appservice_ghost,
)
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return {"device_id": registered_device_id, "access_token": access_token}
async def post_registration_actions(
self, user_id: str, auth_result: dict, access_token: Optional[str]
) -> None:
"""A user has completed registration
Args:
user_id: The user ID that consented
auth_result: The authenticated credentials of the newly registered user.
access_token: The access token of the newly logged in device, or
None if `inhibit_login` enabled.
"""
# TODO: 3pid registration can actually happen on the workers. Consider
# refactoring it.
if self.hs.config.worker_app:
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await self._post_registration_client(
user_id=user_id, auth_result=auth_result, access_token=access_token
)
return
if auth_result and LoginType.EMAIL_IDENTITY in auth_result:
threepid = auth_result[LoginType.EMAIL_IDENTITY]
# Necessary due to auth checks prior to the threepid being
# written to the db
if is_threepid_reserved(
self.hs.config.mau_limits_reserved_threepids, threepid
):
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await self.store.upsert_monthly_active_user(user_id)
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await self._register_email_threepid(user_id, threepid, access_token)
if auth_result and LoginType.MSISDN in auth_result:
threepid = auth_result[LoginType.MSISDN]
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await self._register_msisdn_threepid(user_id, threepid)
if auth_result and LoginType.TERMS in auth_result:
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await self._on_user_consented(user_id, self.hs.config.user_consent_version)
async def _on_user_consented(self, user_id: str, consent_version: str) -> None:
"""A user consented to the terms on registration
Args:
user_id: The user ID that consented.
consent_version: version of the policy the user has consented to.
"""
logger.info("%s has consented to the privacy policy", user_id)
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await self.store.user_set_consent_version(user_id, consent_version)
await self.post_consent_actions(user_id)
async def _register_email_threepid(
self, user_id: str, threepid: dict, token: Optional[str]
) -> None:
"""Add an email address as a 3pid identifier
Also adds an email pusher for the email address, if configured in the
HS config
Must be called on master.
Args:
user_id: id of user
threepid: m.login.email.identity auth response
token: access_token for the user, or None if not logged in.
"""
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reqd = ("medium", "address", "validated_at")
if any(x not in threepid for x in reqd):
# This will only happen if the ID server returns a malformed response
logger.info("Can't add incomplete 3pid")
return
await self._auth_handler.add_threepid(
user_id,
threepid["medium"],
threepid["address"],
threepid["validated_at"],
)
# And we add an email pusher for them by default, but only
# if email notifications are enabled (so people don't start
# getting mail spam where they weren't before if email
# notifs are set up on a homeserver)
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if (
self.hs.config.email_enable_notifs
and self.hs.config.email_notif_for_new_users
and token
):
# Pull the ID of the access token back out of the db
# It would really make more sense for this to be passed
# up when the access token is saved, but that's quite an
# invasive change I'd rather do separately.
user_tuple = await self.store.get_user_by_access_token(token)
# The token better still exist.
assert user_tuple
token_id = user_tuple.token_id
await self.pusher_pool.add_pusher(
user_id=user_id,
access_token=token_id,
kind="email",
app_id="m.email",
app_display_name="Email Notifications",
device_display_name=threepid["address"],
pushkey=threepid["address"],
lang=None, # We don't know a user's language here
data={},
)
async def _register_msisdn_threepid(self, user_id: str, threepid: dict) -> None:
"""Add a phone number as a 3pid identifier
Must be called on master.
Args:
user_id: id of user
threepid: m.login.msisdn auth response
"""
try:
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assert_params_in_dict(threepid, ["medium", "address", "validated_at"])
except SynapseError as ex:
if ex.errcode == Codes.MISSING_PARAM:
# This will only happen if the ID server returns a malformed response
logger.info("Can't add incomplete 3pid")
return None
raise
await self._auth_handler.add_threepid(
user_id,
threepid["medium"],
threepid["address"],
threepid["validated_at"],
)