diff options
| -rw-r--r-- | changelog.d/16274.feature | 1 | ||||
| -rw-r--r-- | synapse/handlers/send_email.py | 10 | ||||
| -rw-r--r-- | synapse/push/mailer.py | 33 | ||||
| -rw-r--r-- | synapse/rest/synapse/client/unsubscribe.py | 17 | ||||
| -rw-r--r-- | tests/push/test_email.py | 55 |
5 files changed, 110 insertions, 6 deletions
diff --git a/changelog.d/16274.feature b/changelog.d/16274.feature new file mode 100644 index 0000000000..0d9da2bbef --- /dev/null +++ b/changelog.d/16274.feature @@ -0,0 +1 @@ +Enable users to easily unsubscribe to notifications emails via the `List-Unsubscribe` header. diff --git a/synapse/handlers/send_email.py b/synapse/handlers/send_email.py index 05e21509de..4f5fe62fe8 100644 --- a/synapse/handlers/send_email.py +++ b/synapse/handlers/send_email.py @@ -17,7 +17,7 @@ import logging from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from io import BytesIO -from typing import TYPE_CHECKING, Any, Optional +from typing import TYPE_CHECKING, Any, Dict, Optional from pkg_resources import parse_version @@ -151,6 +151,7 @@ class SendEmailHandler: app_name: str, html: str, text: str, + additional_headers: Optional[Dict[str, str]] = None, ) -> None: """Send a multipart email with the given information. @@ -160,6 +161,7 @@ class SendEmailHandler: app_name: The app name to include in the From header. html: The HTML content to include in the email. text: The plain text content to include in the email. + additional_headers: A map of additional headers to include. """ try: from_string = self._from % {"app": app_name} @@ -181,6 +183,7 @@ class SendEmailHandler: multipart_msg["To"] = email_address multipart_msg["Date"] = email.utils.formatdate() multipart_msg["Message-ID"] = email.utils.make_msgid() + # Discourage automatic responses to Synapse's emails. # Per RFC 3834, automatic responses should not be sent if the "Auto-Submitted" # header is present with any value other than "no". See @@ -194,6 +197,11 @@ class SendEmailHandler: # https://stackoverflow.com/a/25324691/5252017 # https://stackoverflow.com/a/61646381/5252017 multipart_msg["X-Auto-Response-Suppress"] = "All" + + if additional_headers: + for header, value in additional_headers.items(): + multipart_msg[header] = value + multipart_msg.attach(text_part) multipart_msg.attach(html_part) diff --git a/synapse/push/mailer.py b/synapse/push/mailer.py index 79e0627b6a..b6cad18c2d 100644 --- a/synapse/push/mailer.py +++ b/synapse/push/mailer.py @@ -298,20 +298,26 @@ class Mailer: notifs_by_room, state_by_room, notif_events, reason ) + unsubscribe_link = self._make_unsubscribe_link(user_id, app_id, email_address) + template_vars: TemplateVars = { "user_display_name": user_display_name, - "unsubscribe_link": self._make_unsubscribe_link( - user_id, app_id, email_address - ), + "unsubscribe_link": unsubscribe_link, "summary_text": summary_text, "rooms": rooms, "reason": reason, } - await self.send_email(email_address, summary_text, template_vars) + await self.send_email( + email_address, summary_text, template_vars, unsubscribe_link + ) async def send_email( - self, email_address: str, subject: str, extra_template_vars: TemplateVars + self, + email_address: str, + subject: str, + extra_template_vars: TemplateVars, + unsubscribe_link: Optional[str] = None, ) -> None: """Send an email with the given information and template text""" template_vars: TemplateVars = { @@ -330,6 +336,23 @@ class Mailer: app_name=self.app_name, html=html_text, text=plain_text, + # Include the List-Unsubscribe header which some clients render in the UI. + # Per RFC 2369, this can be a URL or mailto URL. See + # https://www.rfc-editor.org/rfc/rfc2369.html#section-3.2 + # + # It is preferred to use email, but Synapse doesn't support incoming email. + # + # Also include the List-Unsubscribe-Post header from RFC 8058. See + # https://www.rfc-editor.org/rfc/rfc8058.html#section-3.1 + # + # Note that many email clients will not render the unsubscribe link + # unless DKIM, etc. is properly setup. + additional_headers={ + "List-Unsubscribe-Post": "List-Unsubscribe=One-Click", + "List-Unsubscribe": f"<{unsubscribe_link}>", + } + if unsubscribe_link + else None, ) async def _get_room_vars( diff --git a/synapse/rest/synapse/client/unsubscribe.py b/synapse/rest/synapse/client/unsubscribe.py index 60321018f9..050fd7bba1 100644 --- a/synapse/rest/synapse/client/unsubscribe.py +++ b/synapse/rest/synapse/client/unsubscribe.py @@ -38,6 +38,10 @@ class UnsubscribeResource(DirectServeHtmlResource): self.macaroon_generator = hs.get_macaroon_generator() async def _async_render_GET(self, request: SynapseRequest) -> None: + """ + Handle a user opening an unsubscribe link in the browser, either via an + HTML/Text email or via the List-Unsubscribe header. + """ token = parse_string(request, "access_token", required=True) app_id = parse_string(request, "app_id", required=True) pushkey = parse_string(request, "pushkey", required=True) @@ -62,3 +66,16 @@ class UnsubscribeResource(DirectServeHtmlResource): 200, UnsubscribeResource.SUCCESS_HTML, ) + + async def _async_render_POST(self, request: SynapseRequest) -> None: + """ + Handle a mail user agent POSTing to the unsubscribe URL via the + List-Unsubscribe & List-Unsubscribe-Post headers. + """ + + # TODO Assert that the body has a single field + + # Assert the body has form encoded key/value pair of + # List-Unsubscribe=One-Click. + + await self._async_render_GET(request) diff --git a/tests/push/test_email.py b/tests/push/test_email.py index 4b5c96aeae..73a430ddc6 100644 --- a/tests/push/test_email.py +++ b/tests/push/test_email.py @@ -13,10 +13,12 @@ # limitations under the License. import email.message import os +from http import HTTPStatus from typing import Any, Dict, List, Sequence, Tuple import attr import pkg_resources +from parameterized import parameterized from twisted.internet.defer import Deferred from twisted.test.proto_helpers import MemoryReactor @@ -25,9 +27,11 @@ import synapse.rest.admin from synapse.api.errors import Codes, SynapseError from synapse.push.emailpusher import EmailPusher from synapse.rest.client import login, room +from synapse.rest.synapse.client.unsubscribe import UnsubscribeResource from synapse.server import HomeServer from synapse.util import Clock +from tests.server import FakeSite, make_request from tests.unittest import HomeserverTestCase @@ -175,6 +179,57 @@ class EmailPusherTests(HomeserverTestCase): self._check_for_mail() + @parameterized.expand([(False,), (True,)]) + def test_unsubscribe(self, use_post: bool) -> None: + # Create a simple room with two users + room = self.helper.create_room_as(self.user_id, tok=self.access_token) + self.helper.invite( + room=room, src=self.user_id, tok=self.access_token, targ=self.others[0].id + ) + self.helper.join(room=room, user=self.others[0].id, tok=self.others[0].token) + + # The other user sends a single message. + self.helper.send(room, body="Hi!", tok=self.others[0].token) + + # We should get emailed about that message + args, kwargs = self._check_for_mail() + + # That email should contain an unsubscribe link in the body and header. + msg: bytes = args[5] + + # Multipart: plain text, base 64 encoded; html, base 64 encoded + multipart_msg = email.message_from_bytes(msg) + txt = multipart_msg.get_payload()[0].get_payload(decode=True).decode() + html = multipart_msg.get_payload()[1].get_payload(decode=True).decode() + self.assertIn("/_synapse/client/unsubscribe", txt) + self.assertIn("/_synapse/client/unsubscribe", html) + + # The unsubscribe headers should exist. + assert multipart_msg.get("List-Unsubscribe") is not None + self.assertIsNotNone(multipart_msg.get("List-Unsubscribe-Post")) + + # Open the unsubscribe link. + unsubscribe_link = multipart_msg["List-Unsubscribe"].strip("<>") + unsubscribe_resource = UnsubscribeResource(self.hs) + channel = make_request( + self.reactor, + FakeSite(unsubscribe_resource, self.reactor), + "POST" if use_post else "GET", + unsubscribe_link, + shorthand=False, + ) + self.assertEqual(HTTPStatus.OK, channel.code, channel.result) + + # Ensure the pusher was removed. + pushers = list( + self.get_success( + self.hs.get_datastores().main.get_pushers_by( + {"user_name": self.user_id} + ) + ) + ) + self.assertEqual(pushers, []) + def test_invite_sends_email(self) -> None: # Create a room and invite the user to it room = self.helper.create_room_as(self.others[0].id, tok=self.others[0].token) |