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+# Copyright 2021 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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+
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+
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+from typing import List, Tuple
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+
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+from zope.interface import implementer
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+
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+from twisted.internet import defer
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+from twisted.internet.address import IPv4Address
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+from twisted.internet.defer import ensureDeferred
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+from twisted.mail import interfaces, smtp
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+
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+from tests.server import FakeTransport
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+from tests.unittest import HomeserverTestCase
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+
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+
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+@implementer(interfaces.IMessageDelivery)
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+class _DummyMessageDelivery:
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+ def __init__(self):
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+ # (recipient, message) tuples
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+ self.messages: List[Tuple[smtp.Address, bytes]] = []
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+
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+ def receivedHeader(self, helo, origin, recipients):
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+ return None
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+
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+ def validateFrom(self, helo, origin):
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+ return origin
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+
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+ def record_message(self, recipient: smtp.Address, message: bytes):
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+ self.messages.append((recipient, message))
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+
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+ def validateTo(self, user: smtp.User):
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+ return lambda: _DummyMessage(self, user)
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+
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+
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+@implementer(interfaces.IMessageSMTP)
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+class _DummyMessage:
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+ """IMessageSMTP implementation which saves the message delivered to it
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+ to the _DummyMessageDelivery object.
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+ """
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+
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+ def __init__(self, delivery: _DummyMessageDelivery, user: smtp.User):
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+ self._delivery = delivery
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+ self._user = user
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+ self._buffer: List[bytes] = []
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+
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+ def lineReceived(self, line):
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+ self._buffer.append(line)
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+
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+ def eomReceived(self):
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+ message = b"\n".join(self._buffer) + b"\n"
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+ self._delivery.record_message(self._user.dest, message)
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+ return defer.succeed(b"saved")
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+
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+ def connectionLost(self):
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+ pass
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+
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+
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+class SendEmailHandlerTestCase(HomeserverTestCase):
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+ def test_send_email(self):
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+ """Happy-path test that we can send email to a non-TLS server."""
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+ h = self.hs.get_send_email_handler()
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+ d = ensureDeferred(
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+ h.send_email(
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+ "foo@bar.com", "test subject", "Tests", "HTML content", "Text content"
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+ )
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+ )
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+ # there should be an attempt to connect to localhost:25
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+ self.assertEqual(len(self.reactor.tcpClients), 1)
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+ (host, port, client_factory, _timeout, _bindAddress) = self.reactor.tcpClients[
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+ 0
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+ ]
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+ self.assertEqual(host, "localhost")
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+ self.assertEqual(port, 25)
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+
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+ # wire it up to an SMTP server
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+ message_delivery = _DummyMessageDelivery()
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+ server_protocol = smtp.ESMTP()
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+ server_protocol.delivery = message_delivery
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+ # make sure that the server uses the test reactor to set timeouts
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+ server_protocol.callLater = self.reactor.callLater # type: ignore[assignment]
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+
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+ client_protocol = client_factory.buildProtocol(None)
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+ client_protocol.makeConnection(FakeTransport(server_protocol, self.reactor))
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+ server_protocol.makeConnection(
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+ FakeTransport(
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+ client_protocol,
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+ self.reactor,
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+ peer_address=IPv4Address("TCP", "127.0.0.1", 1234),
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+ )
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+ )
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+
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+ # the message should now get delivered
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+ self.get_success(d, by=0.1)
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+
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+ # check it arrived
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+ self.assertEqual(len(message_delivery.messages), 1)
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+ user, msg = message_delivery.messages.pop()
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+ self.assertEqual(str(user), "foo@bar.com")
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+ self.assertIn(b"Subject: test subject", msg)
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