159 lines
5.2 KiB
Python
159 lines
5.2 KiB
Python
# Copyright 2021 The Matrix.org C.I.C. Foundation
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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 email.utils
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import logging
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from email.mime.multipart import MIMEMultipart
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from email.mime.text import MIMEText
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from io import BytesIO
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from typing import TYPE_CHECKING, Optional
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from twisted.internet.defer import Deferred
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from twisted.internet.interfaces import IReactorTCP
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from twisted.mail.smtp import ESMTPSenderFactory
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from synapse.logging.context import make_deferred_yieldable
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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async def _sendmail(
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reactor: IReactorTCP,
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smtphost: str,
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smtpport: int,
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from_addr: str,
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to_addr: str,
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msg_bytes: bytes,
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username: Optional[bytes] = None,
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password: Optional[bytes] = None,
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require_auth: bool = False,
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require_tls: bool = False,
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tls_hostname: Optional[str] = None,
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) -> None:
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"""A simple wrapper around ESMTPSenderFactory, to allow substitution in tests
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Params:
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reactor: reactor to use to make the outbound connection
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smtphost: hostname to connect to
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smtpport: port to connect to
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from_addr: "From" address for email
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to_addr: "To" address for email
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msg_bytes: Message content
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username: username to authenticate with, if auth is enabled
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password: password to give when authenticating
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require_auth: if auth is not offered, fail the request
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require_tls: if TLS is not offered, fail the reqest
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tls_hostname: TLS hostname to check for. None to disable TLS.
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"""
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msg = BytesIO(msg_bytes)
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d: "Deferred[object]" = Deferred()
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factory = ESMTPSenderFactory(
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username,
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password,
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from_addr,
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to_addr,
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msg,
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d,
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heloFallback=True,
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requireAuthentication=require_auth,
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requireTransportSecurity=require_tls,
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hostname=tls_hostname,
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)
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# the IReactorTCP interface claims host has to be a bytes, which seems to be wrong
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reactor.connectTCP(smtphost, smtpport, factory, timeout=30, bindAddress=None) # type: ignore[arg-type]
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await make_deferred_yieldable(d)
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class SendEmailHandler:
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self._reactor = hs.get_reactor()
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self._from = hs.config.email.email_notif_from
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self._smtp_host = hs.config.email.email_smtp_host
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self._smtp_port = hs.config.email.email_smtp_port
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user = hs.config.email.email_smtp_user
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self._smtp_user = user.encode("utf-8") if user is not None else None
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passwd = hs.config.email.email_smtp_pass
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self._smtp_pass = passwd.encode("utf-8") if passwd is not None else None
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self._require_transport_security = hs.config.email.require_transport_security
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self._enable_tls = hs.config.email.enable_smtp_tls
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self._sendmail = _sendmail
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async def send_email(
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self,
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email_address: str,
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subject: str,
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app_name: str,
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html: str,
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text: str,
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) -> None:
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"""Send a multipart email with the given information.
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Args:
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email_address: The address to send the email to.
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subject: The email's subject.
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app_name: The app name to include in the From header.
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html: The HTML content to include in the email.
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text: The plain text content to include in the email.
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"""
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try:
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from_string = self._from % {"app": app_name}
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except (KeyError, TypeError):
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from_string = self._from
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raw_from = email.utils.parseaddr(from_string)[1]
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raw_to = email.utils.parseaddr(email_address)[1]
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if raw_to == "":
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raise RuntimeError("Invalid 'to' address")
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html_part = MIMEText(html, "html", "utf8")
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text_part = MIMEText(text, "plain", "utf8")
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multipart_msg = MIMEMultipart("alternative")
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multipart_msg["Subject"] = subject
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multipart_msg["From"] = from_string
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multipart_msg["To"] = email_address
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multipart_msg["Date"] = email.utils.formatdate()
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multipart_msg["Message-ID"] = email.utils.make_msgid()
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multipart_msg.attach(text_part)
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multipart_msg.attach(html_part)
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logger.info("Sending email to %s" % email_address)
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await self._sendmail(
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self._reactor,
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self._smtp_host,
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self._smtp_port,
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raw_from,
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raw_to,
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multipart_msg.as_string().encode("utf8"),
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username=self._smtp_user,
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password=self._smtp_pass,
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require_auth=self._smtp_user is not None,
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require_tls=self._require_transport_security,
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tls_hostname=self._smtp_host if self._enable_tls else None,
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)
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