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# -*- test-case-name: twisted.mail.test.test_pop3client -*-
# Copyright (c) 2001-2004 Divmod Inc.
# See LICENSE for details.
import inspect
import sys
from typing import List
from unittest import skipIf
from zope.interface import directlyProvides
import twisted.mail._pop3client
from twisted.internet import defer, error, interfaces, protocol, reactor
from twisted.internet.testing import StringTransport
from twisted.mail.pop3 import (
AdvancedPOP3Client as POP3Client,
InsecureAuthenticationDisallowed,
ServerErrorResponse,
)
from twisted.mail.test import pop3testserver
from twisted.protocols import basic, loopback
from twisted.python import log
from twisted.trial.unittest import TestCase
try:
from twisted.test.ssl_helpers import ClientTLSContext, ServerTLSContext
except ImportError:
ClientTLSContext = None # type: ignore[assignment,misc]
ServerTLSContext = None # type: ignore[assignment,misc]
class StringTransportWithConnectionLosing(StringTransport):
def loseConnection(self):
self.protocol.connectionLost(error.ConnectionDone())
capCache = {
b"TOP": None,
b"LOGIN-DELAY": b"180",
b"UIDL": None,
b"STLS": None,
b"USER": None,
b"SASL": b"LOGIN",
}
def setUp(greet=True):
p = POP3Client()
# Skip the CAPA login will issue if it doesn't already have a
# capability cache
p._capCache = capCache
t = StringTransportWithConnectionLosing()
t.protocol = p
p.makeConnection(t)
if greet:
p.dataReceived(b"+OK Hello!\r\n")
return p, t
def strip(f):
return lambda result, f=f: f()
class POP3ClientLoginTests(TestCase):
def testNegativeGreeting(self):
p, t = setUp(greet=False)
p.allowInsecureLogin = True
d = p.login(b"username", b"password")
p.dataReceived(b"-ERR Offline for maintenance\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"Offline for maintenance")
)
def testOkUser(self):
p, t = setUp()
d = p.user(b"username")
self.assertEqual(t.value(), b"USER username\r\n")
p.dataReceived(b"+OK send password\r\n")
return d.addCallback(self.assertEqual, b"send password")
def testBadUser(self):
p, t = setUp()
d = p.user(b"username")
self.assertEqual(t.value(), b"USER username\r\n")
p.dataReceived(b"-ERR account suspended\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"account suspended")
)
def testOkPass(self):
p, t = setUp()
d = p.password(b"password")
self.assertEqual(t.value(), b"PASS password\r\n")
p.dataReceived(b"+OK you're in!\r\n")
return d.addCallback(self.assertEqual, b"you're in!")
def testBadPass(self):
p, t = setUp()
d = p.password(b"password")
self.assertEqual(t.value(), b"PASS password\r\n")
p.dataReceived(b"-ERR go away\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"go away")
)
def testOkLogin(self):
p, t = setUp()
p.allowInsecureLogin = True
d = p.login(b"username", b"password")
self.assertEqual(t.value(), b"USER username\r\n")
p.dataReceived(b"+OK go ahead\r\n")
self.assertEqual(t.value(), b"USER username\r\nPASS password\r\n")
p.dataReceived(b"+OK password accepted\r\n")
return d.addCallback(self.assertEqual, b"password accepted")
def testBadPasswordLogin(self):
p, t = setUp()
p.allowInsecureLogin = True
d = p.login(b"username", b"password")
self.assertEqual(t.value(), b"USER username\r\n")
p.dataReceived(b"+OK waiting on you\r\n")
self.assertEqual(t.value(), b"USER username\r\nPASS password\r\n")
p.dataReceived(b"-ERR bogus login\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"bogus login")
)
def testBadUsernameLogin(self):
p, t = setUp()
p.allowInsecureLogin = True
d = p.login(b"username", b"password")
self.assertEqual(t.value(), b"USER username\r\n")
p.dataReceived(b"-ERR bogus login\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"bogus login")
)
def testServerGreeting(self):
p, t = setUp(greet=False)
p.dataReceived(b"+OK lalala this has no challenge\r\n")
self.assertEqual(p.serverChallenge, None)
def testServerGreetingWithChallenge(self):
p, t = setUp(greet=False)
p.dataReceived(b"+OK <here is the challenge>\r\n")
self.assertEqual(p.serverChallenge, b"<here is the challenge>")
def testAPOP(self):
p, t = setUp(greet=False)
p.dataReceived(b"+OK <challenge string goes here>\r\n")
d = p.login(b"username", b"password")
self.assertEqual(
t.value(), b"APOP username f34f1e464d0d7927607753129cabe39a\r\n"
)
p.dataReceived(b"+OK Welcome!\r\n")
return d.addCallback(self.assertEqual, b"Welcome!")
def testInsecureLoginRaisesException(self):
p, t = setUp(greet=False)
p.dataReceived(b"+OK Howdy\r\n")
d = p.login(b"username", b"password")
self.assertFalse(t.value())
return self.assertFailure(d, InsecureAuthenticationDisallowed)
def testSSLTransportConsideredSecure(self):
"""
If a server doesn't offer APOP but the transport is secured using
SSL or TLS, a plaintext login should be allowed, not rejected with
an InsecureAuthenticationDisallowed exception.
"""
p, t = setUp(greet=False)
directlyProvides(t, interfaces.ISSLTransport)
p.dataReceived(b"+OK Howdy\r\n")
d = p.login(b"username", b"password")
self.assertEqual(t.value(), b"USER username\r\n")
t.clear()
p.dataReceived(b"+OK\r\n")
self.assertEqual(t.value(), b"PASS password\r\n")
p.dataReceived(b"+OK\r\n")
return d
class ListConsumer:
def __init__(self):
self.data = {}
def consume(self, result):
(item, value) = result
self.data.setdefault(item, []).append(value)
class MessageConsumer:
def __init__(self):
self.data = []
def consume(self, line):
self.data.append(line)
class POP3ClientListTests(TestCase):
def testListSize(self):
p, t = setUp()
d = p.listSize()
self.assertEqual(t.value(), b"LIST\r\n")
p.dataReceived(b"+OK Here it comes\r\n")
p.dataReceived(b"1 3\r\n2 2\r\n3 1\r\n.\r\n")
return d.addCallback(self.assertEqual, [3, 2, 1])
def testListSizeWithConsumer(self):
p, t = setUp()
c = ListConsumer()
f = c.consume
d = p.listSize(f)
self.assertEqual(t.value(), b"LIST\r\n")
p.dataReceived(b"+OK Here it comes\r\n")
p.dataReceived(b"1 3\r\n2 2\r\n3 1\r\n")
self.assertEqual(c.data, {0: [3], 1: [2], 2: [1]})
p.dataReceived(b"5 3\r\n6 2\r\n7 1\r\n")
self.assertEqual(c.data, {0: [3], 1: [2], 2: [1], 4: [3], 5: [2], 6: [1]})
p.dataReceived(b".\r\n")
return d.addCallback(self.assertIdentical, f)
def testFailedListSize(self):
p, t = setUp()
d = p.listSize()
self.assertEqual(t.value(), b"LIST\r\n")
p.dataReceived(b"-ERR Fatal doom server exploded\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"Fatal doom server exploded")
)
def testListUID(self):
p, t = setUp()
d = p.listUID()
self.assertEqual(t.value(), b"UIDL\r\n")
p.dataReceived(b"+OK Here it comes\r\n")
p.dataReceived(b"1 abc\r\n2 def\r\n3 ghi\r\n.\r\n")
return d.addCallback(self.assertEqual, [b"abc", b"def", b"ghi"])
def testListUIDWithConsumer(self):
p, t = setUp()
c = ListConsumer()
f = c.consume
d = p.listUID(f)
self.assertEqual(t.value(), b"UIDL\r\n")
p.dataReceived(b"+OK Here it comes\r\n")
p.dataReceived(b"1 xyz\r\n2 abc\r\n5 mno\r\n")
self.assertEqual(c.data, {0: [b"xyz"], 1: [b"abc"], 4: [b"mno"]})
p.dataReceived(b".\r\n")
return d.addCallback(self.assertIdentical, f)
def testFailedListUID(self):
p, t = setUp()
d = p.listUID()
self.assertEqual(t.value(), b"UIDL\r\n")
p.dataReceived(b"-ERR Fatal doom server exploded\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"Fatal doom server exploded")
)
class POP3ClientMessageTests(TestCase):
def testRetrieve(self):
p, t = setUp()
d = p.retrieve(7)
self.assertEqual(t.value(), b"RETR 8\r\n")
p.dataReceived(b"+OK Message incoming\r\n")
p.dataReceived(b"La la la here is message text\r\n")
p.dataReceived(b"..Further message text tra la la\r\n")
p.dataReceived(b".\r\n")
return d.addCallback(
self.assertEqual,
[b"La la la here is message text", b".Further message text tra la la"],
)
def testRetrieveWithConsumer(self):
p, t = setUp()
c = MessageConsumer()
f = c.consume
d = p.retrieve(7, f)
self.assertEqual(t.value(), b"RETR 8\r\n")
p.dataReceived(b"+OK Message incoming\r\n")
p.dataReceived(b"La la la here is message text\r\n")
p.dataReceived(b"..Further message text\r\n.\r\n")
return d.addCallback(self._cbTestRetrieveWithConsumer, f, c)
def _cbTestRetrieveWithConsumer(self, result, f, c):
self.assertIdentical(result, f)
self.assertEqual(
c.data, [b"La la la here is message text", b".Further message text"]
)
def testPartialRetrieve(self):
p, t = setUp()
d = p.retrieve(7, lines=2)
self.assertEqual(t.value(), b"TOP 8 2\r\n")
p.dataReceived(b"+OK 2 lines on the way\r\n")
p.dataReceived(b"Line the first! Woop\r\n")
p.dataReceived(b"Line the last! Bye\r\n")
p.dataReceived(b".\r\n")
return d.addCallback(
self.assertEqual, [b"Line the first! Woop", b"Line the last! Bye"]
)
def testPartialRetrieveWithConsumer(self):
p, t = setUp()
c = MessageConsumer()
f = c.consume
d = p.retrieve(7, f, lines=2)
self.assertEqual(t.value(), b"TOP 8 2\r\n")
p.dataReceived(b"+OK 2 lines on the way\r\n")
p.dataReceived(b"Line the first! Woop\r\n")
p.dataReceived(b"Line the last! Bye\r\n")
p.dataReceived(b".\r\n")
return d.addCallback(self._cbTestPartialRetrieveWithConsumer, f, c)
def _cbTestPartialRetrieveWithConsumer(self, result, f, c):
self.assertIdentical(result, f)
self.assertEqual(c.data, [b"Line the first! Woop", b"Line the last! Bye"])
def testFailedRetrieve(self):
p, t = setUp()
d = p.retrieve(0)
self.assertEqual(t.value(), b"RETR 1\r\n")
p.dataReceived(b"-ERR Fatal doom server exploded\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"Fatal doom server exploded")
)
def test_concurrentRetrieves(self):
"""
Issue three retrieve calls immediately without waiting for any to
succeed and make sure they all do succeed eventually.
"""
p, t = setUp()
messages = [
p.retrieve(i).addCallback(
self.assertEqual,
[b"First line of %d." % (i + 1,), b"Second line of %d." % (i + 1,)],
)
for i in range(3)
]
for i in range(1, 4):
self.assertEqual(t.value(), b"RETR %d\r\n" % (i,))
t.clear()
p.dataReceived(b"+OK 2 lines on the way\r\n")
p.dataReceived(b"First line of %d.\r\n" % (i,))
p.dataReceived(b"Second line of %d.\r\n" % (i,))
self.assertEqual(t.value(), b"")
p.dataReceived(b".\r\n")
return defer.DeferredList(messages, fireOnOneErrback=True)
class POP3ClientMiscTests(TestCase):
def testCapability(self):
p, t = setUp()
d = p.capabilities(useCache=0)
self.assertEqual(t.value(), b"CAPA\r\n")
p.dataReceived(b"+OK Capabilities on the way\r\n")
p.dataReceived(b"X\r\nY\r\nZ\r\nA 1 2 3\r\nB 1 2\r\nC 1\r\n.\r\n")
return d.addCallback(
self.assertEqual,
{
b"X": None,
b"Y": None,
b"Z": None,
b"A": [b"1", b"2", b"3"],
b"B": [b"1", b"2"],
b"C": [b"1"],
},
)
def testCapabilityError(self):
p, t = setUp()
d = p.capabilities(useCache=0)
self.assertEqual(t.value(), b"CAPA\r\n")
p.dataReceived(b"-ERR This server is lame!\r\n")
return d.addCallback(self.assertEqual, {})
def testStat(self):
p, t = setUp()
d = p.stat()
self.assertEqual(t.value(), b"STAT\r\n")
p.dataReceived(b"+OK 1 1212\r\n")
return d.addCallback(self.assertEqual, (1, 1212))
def testStatError(self):
p, t = setUp()
d = p.stat()
self.assertEqual(t.value(), b"STAT\r\n")
p.dataReceived(b"-ERR This server is lame!\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"This server is lame!")
)
def testNoop(self):
p, t = setUp()
d = p.noop()
self.assertEqual(t.value(), b"NOOP\r\n")
p.dataReceived(b"+OK No-op to you too!\r\n")
return d.addCallback(self.assertEqual, b"No-op to you too!")
def testNoopError(self):
p, t = setUp()
d = p.noop()
self.assertEqual(t.value(), b"NOOP\r\n")
p.dataReceived(b"-ERR This server is lame!\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"This server is lame!")
)
def testRset(self):
p, t = setUp()
d = p.reset()
self.assertEqual(t.value(), b"RSET\r\n")
p.dataReceived(b"+OK Reset state\r\n")
return d.addCallback(self.assertEqual, b"Reset state")
def testRsetError(self):
p, t = setUp()
d = p.reset()
self.assertEqual(t.value(), b"RSET\r\n")
p.dataReceived(b"-ERR This server is lame!\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"This server is lame!")
)
def testDelete(self):
p, t = setUp()
d = p.delete(3)
self.assertEqual(t.value(), b"DELE 4\r\n")
p.dataReceived(b"+OK Hasta la vista\r\n")
return d.addCallback(self.assertEqual, b"Hasta la vista")
def testDeleteError(self):
p, t = setUp()
d = p.delete(3)
self.assertEqual(t.value(), b"DELE 4\r\n")
p.dataReceived(b"-ERR Winner is not you.\r\n")
return self.assertFailure(d, ServerErrorResponse).addCallback(
lambda exc: self.assertEqual(exc.args[0], b"Winner is not you.")
)
class SimpleClient(POP3Client):
def __init__(self, deferred, contextFactory=None):
self.deferred = deferred
self.allowInsecureLogin = True
def serverGreeting(self, challenge):
self.deferred.callback(None)
class POP3HelperMixin:
serverCTX = None
clientCTX = None
def setUp(self):
d = defer.Deferred()
self.server = pop3testserver.POP3TestServer(contextFactory=self.serverCTX)
self.client = SimpleClient(d, contextFactory=self.clientCTX)
self.client.timeout = 30
self.connected = d
def tearDown(self):
del self.server
del self.client
del self.connected
def _cbStopClient(self, ignore):
self.client.transport.loseConnection()
def _ebGeneral(self, failure):
self.client.transport.loseConnection()
self.server.transport.loseConnection()
return failure
def loopback(self):
return loopback.loopbackTCP(self.server, self.client, noisy=False)
class TLSServerFactory(protocol.ServerFactory):
class protocol(basic.LineReceiver):
context = None
output: List[bytes] = []
def connectionMade(self):
self.factory.input = []
self.output = self.output[:]
for line in self.output.pop(0):
self.sendLine(line)
def lineReceived(self, line):
self.factory.input.append(line)
[self.sendLine(l) for l in self.output.pop(0)]
if line == b"STLS":
self.transport.startTLS(self.context)
@skipIf(not ClientTLSContext, "OpenSSL not present")
@skipIf(not interfaces.IReactorSSL(reactor, None), "OpenSSL not present")
class POP3TLSTests(TestCase):
"""
Tests for POP3Client's support for TLS connections.
"""
def test_startTLS(self):
"""
POP3Client.startTLS starts a TLS session over its existing TCP
connection.
"""
sf = TLSServerFactory()
sf.protocol.output = [
[b"+OK"], # Server greeting
[b"+OK", b"STLS", b"."], # CAPA response
[b"+OK"], # STLS response
[b"+OK", b"."], # Second CAPA response
[b"+OK"], # QUIT response
]
sf.protocol.context = ServerTLSContext()
port = reactor.listenTCP(0, sf, interface="127.0.0.1")
self.addCleanup(port.stopListening)
H = port.getHost().host
P = port.getHost().port
connLostDeferred = defer.Deferred()
cp = SimpleClient(defer.Deferred(), ClientTLSContext())
def connectionLost(reason):
SimpleClient.connectionLost(cp, reason)
connLostDeferred.callback(None)
cp.connectionLost = connectionLost
cf = protocol.ClientFactory()
cf.protocol = lambda: cp
conn = reactor.connectTCP(H, P, cf)
def cbConnected(ignored):
log.msg("Connected to server; starting TLS")
return cp.startTLS()
def cbStartedTLS(ignored):
log.msg("Started TLS; disconnecting")
return cp.quit()
def cbDisconnected(ign):
log.msg("Disconnected; asserting correct input received")
self.assertEqual(sf.input, [b"CAPA", b"STLS", b"CAPA", b"QUIT"])
def cleanup(result):
log.msg(
"Asserted correct input; disconnecting "
"client and shutting down server"
)
conn.disconnect()
return connLostDeferred
cp.deferred.addCallback(cbConnected)
cp.deferred.addCallback(cbStartedTLS)
cp.deferred.addCallback(cbDisconnected)
cp.deferred.addBoth(cleanup)
return cp.deferred
class POP3TimeoutTests(POP3HelperMixin, TestCase):
def testTimeout(self):
def login():
d = self.client.login("test", "twisted")
d.addCallback(loggedIn)
d.addErrback(timedOut)
return d
def loggedIn(result):
self.fail("Successfully logged in!? Impossible!")
def timedOut(failure):
failure.trap(error.TimeoutError)
self._cbStopClient(None)
def quit():
return self.client.quit()
self.client.timeout = 0.01
# Tell the server to not return a response to client. This
# will trigger a timeout.
pop3testserver.TIMEOUT_RESPONSE = True
methods = [login, quit]
map(self.connected.addCallback, map(strip, methods))
self.connected.addCallback(self._cbStopClient)
self.connected.addErrback(self._ebGeneral)
return self.loopback()
class POP3ClientModuleStructureTests(TestCase):
"""
Miscellaneous tests more to do with module/package structure than
anything to do with the POP3 client.
"""
def test_all(self):
"""
twisted.mail._pop3client.__all__ should be empty because all classes
should be imported through twisted.mail.pop3.
"""
self.assertEqual(twisted.mail._pop3client.__all__, [])
def test_import(self):
"""
Every public class in twisted.mail._pop3client should be available as
a member of twisted.mail.pop3 with the exception of
twisted.mail._pop3client.POP3Client which should be available as
twisted.mail.pop3.AdvancedClient.
"""
publicClasses = [
c[0]
for c in inspect.getmembers(
sys.modules["twisted.mail._pop3client"], inspect.isclass
)
if not c[0][0] == "_"
]
for pc in publicClasses:
if not pc == "POP3Client":
self.assertTrue(
hasattr(twisted.mail.pop3, pc),
f"{pc} not in {twisted.mail.pop3}",
)
else:
self.assertTrue(hasattr(twisted.mail.pop3, "AdvancedPOP3Client"))
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