irctest/irctest/server_tests/test_resume.py

"""
<https://github.com/DanielOaks/ircv3-specifications/blob/master+resume/extensions/resume.md>
"""

import secrets

from irctest import cases

from irctest.numerics import RPL_AWAY

ANCIENT_TIMESTAMP = "2006-01-02T15:04:05.999Z"


class ResumeTestCase(cases.BaseServerTestCase):
    @cases.SpecificationSelector.requiredBySpecification("Oragono")
    def testNoResumeByDefault(self):
        self.connectClient(
            "bar", capabilities=["batch", "echo-message", "labeled-response"]
        )
        ms = self.getMessages(1)
        resume_messages = [m for m in ms if m.command == "RESUME"]
        self.assertEqual(
            resume_messages,
            [],
            "should not see RESUME messages unless explicitly negotiated",
        )

    @cases.SpecificationSelector.requiredBySpecification("Oragono")
    def testResume(self):
        chname = "#" + secrets.token_hex(12)
        self.connectClient(
            "bar", capabilities=["batch", "labeled-response", "server-time"]
        )
        ms = self.getMessages(1)

        welcome = self.connectClient(
            "baz",
            capabilities=[
                "batch",
                "labeled-response",
                "server-time",
                "draft/resume-0.5",
            ],
        )
        resume_messages = [m for m in welcome if m.command == "RESUME"]
        self.assertEqual(len(resume_messages), 1)
        self.assertEqual(resume_messages[0].params[0], "TOKEN")
        token = resume_messages[0].params[1]

        self.joinChannel(1, chname)
        self.joinChannel(2, chname)
        self.sendLine(1, "PRIVMSG %s :hello friends" % (chname,))
        self.sendLine(1, "PRIVMSG baz :hello friend singular")
        self.getMessages(1)
        # should receive these messages
        privmsgs = [m for m in self.getMessages(2) if m.command == "PRIVMSG"]
        self.assertEqual(len(privmsgs), 2)
        privmsgs.sort(key=lambda m: m.params[0])
        self.assertMessageEqual(
            privmsgs[0], command="PRIVMSG", params=[chname, "hello friends"]
        )
        self.assertMessageEqual(
            privmsgs[1], command="PRIVMSG", params=["baz", "hello friend singular"]
        )
        channelMsgTime = privmsgs[0].tags.get("time")

        # tokens MUST be cryptographically secure; therefore, this token should be invalid
        # with probability at least 1 - 1/(2**128)
        bad_token = "a" * len(token)
        self.addClient()
        self.sendLine(3, "CAP LS")
        self.sendLine(3, "CAP REQ :batch labeled-response server-time draft/resume-0.5")
        self.sendLine(3, "NICK tempnick")
        self.sendLine(3, "USER tempuser 0 * tempuser")
        self.sendLine(3, " ".join(("RESUME", bad_token, ANCIENT_TIMESTAMP)))

        # resume with a bad token MUST fail
        ms = self.getMessages(3)
        resume_err_messages = [
            m
            for m in ms
            if m.command == "FAIL" and m.params[:2] == ["RESUME", "INVALID_TOKEN"]
        ]
        self.assertEqual(len(resume_err_messages), 1)
        # however, registration should proceed with the alternative nick
        self.sendLine(3, "CAP END")
        welcome_msgs = [
            m for m in self.getMessages(3) if m.command == "001"
        ]  # RPL_WELCOME
        self.assertEqual(welcome_msgs[0].params[0], "tempnick")

        self.addClient()
        self.sendLine(4, "CAP LS")
        self.sendLine(4, "CAP REQ :batch labeled-response server-time draft/resume-0.5")
        self.sendLine(4, "NICK tempnick_")
        self.sendLine(4, "USER tempuser 0 * tempuser")
        # resume with a timestamp in the distant past
        self.sendLine(4, " ".join(("RESUME", token, ANCIENT_TIMESTAMP)))
        # successful resume does not require CAP END:
        # https://github.com/ircv3/ircv3-specifications/pull/306/files#r255318883
        ms = self.getMessages(4)

        # now, do a valid resume with the correct token
        resume_messages = [m for m in ms if m.command == "RESUME"]
        self.assertEqual(len(resume_messages), 2)
        self.assertEqual(resume_messages[0].params[0], "TOKEN")
        new_token = resume_messages[0].params[1]
        self.assertNotEqual(
            token,
            new_token,
            "should receive a new, strong resume token; instead got " + new_token,
        )
        # success message
        self.assertMessageEqual(
            resume_messages[1], command="RESUME", params=["SUCCESS", "baz"]
        )

        # test replay of messages
        privmsgs = [
            m for m in ms if m.command == "PRIVMSG" and m.prefix.startswith("bar")
        ]
        self.assertEqual(len(privmsgs), 2)
        privmsgs.sort(key=lambda m: m.params[0])
        self.assertMessageEqual(
            privmsgs[0], command="PRIVMSG", params=[chname, "hello friends"]
        )
        self.assertMessageEqual(
            privmsgs[1], command="PRIVMSG", params=["baz", "hello friend singular"]
        )
        # should replay with the original server-time
        # TODO this probably isn't testing anything because the timestamp only has second resolution,
        # hence will typically match by accident
        self.assertEqual(privmsgs[0].tags.get("time"), channelMsgTime)

        # legacy client should receive a QUIT and a JOIN
        quit, join = [m for m in self.getMessages(1) if m.command in ("QUIT", "JOIN")]
        self.assertEqual(quit.command, "QUIT")
        self.assertTrue(quit.prefix.startswith("baz"))
        self.assertMessageEqual(join, command="JOIN", params=[chname])
        self.assertTrue(join.prefix.startswith("baz"))

        # original client should have been disconnected
        self.assertDisconnected(2)
        # new client should be receiving PRIVMSG sent to baz
        self.sendLine(1, "PRIVMSG baz :hello again")
        self.getMessages(1)
        self.assertMessageEqual(
            self.getMessage(4), command="PRIVMSG", params=["baz", "hello again"]
        )

        # test chain-resuming (resuming the resumed connection, using the new token)
        self.addClient()
        self.sendLine(5, "CAP LS")
        self.sendLine(5, "CAP REQ :batch labeled-response server-time draft/resume-0.5")
        self.sendLine(5, "NICK tempnick_")
        self.sendLine(5, "USER tempuser 0 * tempuser")
        self.sendLine(5, "RESUME " + new_token)
        ms = self.getMessages(5)

        resume_messages = [m for m in ms if m.command == "RESUME"]
        self.assertEqual(len(resume_messages), 2)
        self.assertEqual(resume_messages[0].params[0], "TOKEN")
        new_new_token = resume_messages[0].params[1]
        self.assertNotEqual(
            token,
            new_new_token,
            "should receive a new, strong resume token; instead got " + new_new_token,
        )
        self.assertNotEqual(
            new_token,
            new_new_token,
            "should receive a new, strong resume token; instead got " + new_new_token,
        )
        # success message
        self.assertMessageEqual(
            resume_messages[1], command="RESUME", params=["SUCCESS", "baz"]
        )

    @cases.SpecificationSelector.requiredBySpecification("Oragono")
    def testBRB(self):
        chname = "#" + secrets.token_hex(12)
        self.connectClient(
            "bar",
            capabilities=[
                "batch",
                "labeled-response",
                "message-tags",
                "server-time",
                "draft/resume-0.5",
            ],
        )
        ms = self.getMessages(1)
        self.joinChannel(1, chname)

        welcome = self.connectClient(
            "baz",
            capabilities=[
                "batch",
                "labeled-response",
                "server-time",
                "draft/resume-0.5",
            ],
        )
        resume_messages = [m for m in welcome if m.command == "RESUME"]
        self.assertEqual(len(resume_messages), 1)
        self.assertEqual(resume_messages[0].params[0], "TOKEN")
        token = resume_messages[0].params[1]
        self.joinChannel(2, chname)

        self.getMessages(1)
        self.sendLine(2, "BRB :software upgrade")
        # should receive, e.g., `BRB 210` (number of seconds)
        ms = [m for m in self.getMessages(2) if m.command == "BRB"]
        self.assertEqual(len(ms), 1)
        self.assertGreater(int(ms[0].params[0]), 1)
        # BRB disconnects you
        self.assertDisconnected(2)
        # without sending a QUIT line to friends
        self.assertEqual(self.getMessages(1), [])

        self.sendLine(1, "PRIVMSG baz :hey there")
        # BRB message should be sent as an away message
        self.assertMessageEqual(
            self.getMessage(1),
            command=RPL_AWAY,
            params=["bar", "baz", "software upgrade"],
        )

        self.addClient(3)
        self.sendLine(3, "CAP REQ :batch account-tag message-tags draft/resume-0.5")
        self.sendLine(3, " ".join(("RESUME", token, ANCIENT_TIMESTAMP)))
        ms = self.getMessages(3)

        resume_messages = [m for m in ms if m.command == "RESUME"]
        self.assertEqual(len(resume_messages), 2)
        self.assertEqual(resume_messages[0].params[0], "TOKEN")
        self.assertMessageEqual(
            resume_messages[1], command="RESUME", params=["SUCCESS", "baz"]
        )

        privmsgs = [
            m for m in ms if m.command == "PRIVMSG" and m.prefix.startswith("bar")
        ]
        self.assertEqual(len(privmsgs), 1)
        self.assertMessageEqual(privmsgs[0], params=["baz", "hey there"])

        # friend with the resume cap should receive a RESUMED message
        resumed_messages = [m for m in self.getMessages(1) if m.command == "RESUMED"]
        self.assertEqual(len(resumed_messages), 1)
        self.assertTrue(resumed_messages[0].prefix.startswith("baz"))