synapse-product/synapse/handlers/account_validity.py
2021-03-23 07:12:48 -04:00

268 lines
10 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2019 New Vector 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 email.mime.multipart
import email.utils
import logging
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from typing import TYPE_CHECKING, List
from synapse.api.errors import StoreError, SynapseError
from synapse.logging.context import make_deferred_yieldable
from synapse.metrics.background_process_metrics import wrap_as_background_process
from synapse.types import UserID
from synapse.util import stringutils
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class AccountValidityHandler:
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.config = hs.config
self.store = self.hs.get_datastore()
self.sendmail = self.hs.get_sendmail()
self.clock = self.hs.get_clock()
self._account_validity = self.hs.config.account_validity
if (
self._account_validity.enabled
and self._account_validity.renew_by_email_enabled
):
# Don't do email-specific configuration if renewal by email is disabled.
self._template_html = self.config.account_validity_template_html
self._template_text = self.config.account_validity_template_text
try:
app_name = self.hs.config.email_app_name
self._subject = self._account_validity.renew_email_subject % {
"app": app_name
}
self._from_string = self.hs.config.email_notif_from % {"app": app_name}
except Exception:
# If substitution failed, fall back to the bare strings.
self._subject = self._account_validity.renew_email_subject
self._from_string = self.hs.config.email_notif_from
self._raw_from = email.utils.parseaddr(self._from_string)[1]
# Check the renewal emails to send and send them every 30min.
if hs.config.run_background_tasks:
self.clock.looping_call(self._send_renewal_emails, 30 * 60 * 1000)
@wrap_as_background_process("send_renewals")
async def _send_renewal_emails(self) -> None:
"""Gets the list of users whose account is expiring in the amount of time
configured in the ``renew_at`` parameter from the ``account_validity``
configuration, and sends renewal emails to all of these users as long as they
have an email 3PID attached to their account.
"""
expiring_users = await self.store.get_users_expiring_soon()
if expiring_users:
for user in expiring_users:
await self._send_renewal_email(
user_id=user["user_id"], expiration_ts=user["expiration_ts_ms"]
)
async def send_renewal_email_to_user(self, user_id: str) -> None:
"""
Send a renewal email for a specific user.
Args:
user_id: The user ID to send a renewal email for.
Raises:
SynapseError if the user is not set to renew.
"""
expiration_ts = await self.store.get_expiration_ts_for_user(user_id)
# If this user isn't set to be expired, raise an error.
if expiration_ts is None:
raise SynapseError(400, "User has no expiration time: %s" % (user_id,))
await self._send_renewal_email(user_id, expiration_ts)
async def _send_renewal_email(self, user_id: str, expiration_ts: int) -> None:
"""Sends out a renewal email to every email address attached to the given user
with a unique link allowing them to renew their account.
Args:
user_id: ID of the user to send email(s) to.
expiration_ts: Timestamp in milliseconds for the expiration date of
this user's account (used in the email templates).
"""
addresses = await self._get_email_addresses_for_user(user_id)
# Stop right here if the user doesn't have at least one email address.
# In this case, they will have to ask their server admin to renew their
# account manually.
# We don't need to do a specific check to make sure the account isn't
# deactivated, as a deactivated account isn't supposed to have any
# email address attached to it.
if not addresses:
return
try:
user_display_name = await self.store.get_profile_displayname(
UserID.from_string(user_id).localpart
)
if user_display_name is None:
user_display_name = user_id
except StoreError:
user_display_name = user_id
renewal_token = await self._get_renewal_token(user_id)
url = "%s_matrix/client/unstable/account_validity/renew?token=%s" % (
self.hs.config.public_baseurl,
renewal_token,
)
template_vars = {
"display_name": user_display_name,
"expiration_ts": expiration_ts,
"url": url,
}
html_text = self._template_html.render(**template_vars)
html_part = MIMEText(html_text, "html", "utf8")
plain_text = self._template_text.render(**template_vars)
text_part = MIMEText(plain_text, "plain", "utf8")
for address in addresses:
raw_to = email.utils.parseaddr(address)[1]
multipart_msg = MIMEMultipart("alternative")
multipart_msg["Subject"] = self._subject
multipart_msg["From"] = self._from_string
multipart_msg["To"] = address
multipart_msg["Date"] = email.utils.formatdate()
multipart_msg["Message-ID"] = email.utils.make_msgid()
multipart_msg.attach(text_part)
multipart_msg.attach(html_part)
logger.info("Sending renewal email to %s", address)
await make_deferred_yieldable(
self.sendmail(
self.hs.config.email_smtp_host,
self._raw_from,
raw_to,
multipart_msg.as_string().encode("utf8"),
reactor=self.hs.get_reactor(),
port=self.hs.config.email_smtp_port,
requireAuthentication=self.hs.config.email_smtp_user is not None,
username=self.hs.config.email_smtp_user,
password=self.hs.config.email_smtp_pass,
requireTransportSecurity=self.hs.config.require_transport_security,
)
)
await self.store.set_renewal_mail_status(user_id=user_id, email_sent=True)
async def _get_email_addresses_for_user(self, user_id: str) -> List[str]:
"""Retrieve the list of email addresses attached to a user's account.
Args:
user_id: ID of the user to lookup email addresses for.
Returns:
Email addresses for this account.
"""
threepids = await self.store.user_get_threepids(user_id)
addresses = []
for threepid in threepids:
if threepid["medium"] == "email":
addresses.append(threepid["address"])
return addresses
async def _get_renewal_token(self, user_id: str) -> str:
"""Generates a 32-byte long random string that will be inserted into the
user's renewal email's unique link, then saves it into the database.
Args:
user_id: ID of the user to generate a string for.
Returns:
The generated string.
Raises:
StoreError(500): Couldn't generate a unique string after 5 attempts.
"""
attempts = 0
while attempts < 5:
try:
renewal_token = stringutils.random_string(32)
await self.store.set_renewal_token_for_user(user_id, renewal_token)
return renewal_token
except StoreError:
attempts += 1
raise StoreError(500, "Couldn't generate a unique string as refresh string.")
async def renew_account(self, renewal_token: str) -> bool:
"""Renews the account attached to a given renewal token by pushing back the
expiration date by the current validity period in the server's configuration.
Args:
renewal_token: Token sent with the renewal request.
Returns:
Whether the provided token is valid.
"""
try:
user_id = await self.store.get_user_from_renewal_token(renewal_token)
except StoreError:
return False
logger.debug("Renewing an account for user %s", user_id)
await self.renew_account_for_user(user_id)
return True
async def renew_account_for_user(
self, user_id: str, expiration_ts: int = None, email_sent: bool = False
) -> int:
"""Renews the account attached to a given user by pushing back the
expiration date by the current validity period in the server's
configuration.
Args:
renewal_token: Token sent with the renewal request.
expiration_ts: New expiration date. Defaults to now + validity period.
email_sen: Whether an email has been sent for this validity period.
Defaults to False.
Returns:
New expiration date for this account, as a timestamp in
milliseconds since epoch.
"""
if expiration_ts is None:
expiration_ts = self.clock.time_msec() + self._account_validity.period
await self.store.set_account_validity_for_user(
user_id=user_id, expiration_ts=expiration_ts, email_sent=email_sent
)
return expiration_ts