import base64
import os
import stat
import sys
import time
import mock


from twisted.trial import unittest
from twisted.internet import defer
from twisted.python import log

from foolscap.api import flushEventualQueue
import foolscap.logging.log

from twisted.application import service
from allmydata.node import Node, formatTimeTahoeStyle, MissingConfigEntry, read_config, config_from_string
from allmydata.introducer.server import create_introducer
from allmydata.client import create_client, _valid_config_sections
from allmydata.util import fileutil, iputil
from allmydata.util.namespace import Namespace
from allmydata.util.configutil import UnknownConfigError
import allmydata.test.common_util as testutil


class LoggingMultiService(service.MultiService):
    def log(self, msg, **kw):
        pass

class TestNode(Node):
    CERTFILE='DEFAULT_CERTFILE_BLANK'

    def __init__(self, basedir):
        config = read_config(
            basedir,
            'DEFAULT_PORTNUMFILE_BLANK',
            _valid_config_sections=_valid_config_sections,
        )
        Node.__init__(self, config, basedir)


class TestCase(testutil.SignalMixin, unittest.TestCase):

    @defer.inlineCallbacks
    def setUp(self):
        testutil.SignalMixin.setUp(self)
        self.parent = LoggingMultiService()
        self.parent.startService()
        self._available_port = yield iputil.allocate_tcp_port()

    def tearDown(self):
        log.msg("%s.tearDown" % self.__class__.__name__)
        testutil.SignalMixin.tearDown(self)
        d = defer.succeed(None)
        d.addCallback(lambda res: self.parent.stopService())
        d.addCallback(flushEventualQueue)
        return d

    def _test_location(self, basedir, expected_addresses, tub_port=None, tub_location=None, local_addresses=None):
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write("[node]\n")
        if tub_port:
            f.write("tub.port = %d\n" % (tub_port,))
        if tub_location is not None:
            f.write("tub.location = %s\n" % (tub_location,))
        f.close()

        if local_addresses:
            self.patch(iputil, 'get_local_addresses_sync',
                       lambda: local_addresses)

        n = TestNode(basedir)
        n.setServiceParent(self.parent)
        furl = n.tub.registerReference(n)
        for address in expected_addresses:
            self.failUnlessIn(address, furl)

    def test_location1(self):
        return self._test_location(basedir="test_node/test_location1",
                                   expected_addresses=["192.0.2.0:1234"],
                                   tub_location="192.0.2.0:1234")

    def test_location2(self):
        return self._test_location(basedir="test_node/test_location2",
                                   expected_addresses=["192.0.2.0:1234", "example.org:8091"],
                                   tub_location="192.0.2.0:1234,example.org:8091")

    def test_location_not_set(self):
        """Checks the autogenerated furl when tub.location is not set."""
        return self._test_location(
            basedir="test_node/test_location3",
            expected_addresses=[
                "127.0.0.1:{}".format(self._available_port),
                "192.0.2.0:{}".format(self._available_port),
            ],
            tub_port=self._available_port,
            local_addresses=["127.0.0.1", "192.0.2.0"],
        )

    def test_location_auto_and_explicit(self):
        """Checks the autogenerated furl when tub.location contains 'AUTO'."""
        return self._test_location(
            basedir="test_node/test_location4",
            expected_addresses=[
                "127.0.0.1:{}".format(self._available_port),
                "192.0.2.0:{}".format(self._available_port),
                "example.com:4321",
            ],
            tub_port=self._available_port,
            tub_location="AUTO,example.com:{}".format(self._available_port),
            local_addresses=["127.0.0.1", "192.0.2.0", "example.com:4321"],
        )

    def test_tahoe_cfg_utf8(self):
        basedir = "test_node/test_tahoe_cfg_utf8"
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write(u"\uFEFF[node]\n".encode('utf-8'))
        f.write(u"nickname = \u2621\n".encode('utf-8'))
        f.close()

        n = TestNode(basedir)
        n.setServiceParent(self.parent)
        self.failUnlessEqual(n.get_config("node", "nickname").decode('utf-8'),
                             u"\u2621")

    def test_tahoe_cfg_hash_in_name(self):
        basedir = "test_node/test_cfg_hash_in_name"
        nickname = "Hash#Bang!" # a clever nickname containing a hash
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write("[node]\n")
        f.write("nickname = %s\n" % (nickname,))
        f.close()
        n = TestNode(basedir)
        self.failUnless(n.nickname == nickname)

    def test_private_config(self):
        basedir = "test_node/test_private_config"
        privdir = os.path.join(basedir, "private")
        fileutil.make_dirs(privdir)
        f = open(os.path.join(privdir, 'already'), 'wt')
        f.write("secret")
        f.close()

        n = TestNode(basedir)
        self.failUnlessEqual(n.get_private_config("already"), "secret")
        self.failUnlessEqual(n.get_private_config("not", "default"), "default")
        self.failUnlessRaises(MissingConfigEntry, n.get_private_config, "not")
        value = n.get_or_create_private_config("new", "start")
        self.failUnlessEqual(value, "start")
        self.failUnlessEqual(n.get_private_config("new"), "start")
        counter = []
        def make_newer():
            counter.append("called")
            return "newer"
        value = n.get_or_create_private_config("newer", make_newer)
        self.failUnlessEqual(len(counter), 1)
        self.failUnlessEqual(value, "newer")
        self.failUnlessEqual(n.get_private_config("newer"), "newer")

        value = n.get_or_create_private_config("newer", make_newer)
        self.failUnlessEqual(len(counter), 1) # don't call unless necessary
        self.failUnlessEqual(value, "newer")

    def test_timestamp(self):
        # this modified logger doesn't seem to get used during the tests,
        # probably because we don't modify the LogObserver that trial
        # installs (only the one that twistd installs). So manually exercise
        # it a little bit.
        t = formatTimeTahoeStyle("ignored", time.time())
        self.failUnless("Z" in t)
        t2 = formatTimeTahoeStyle("ignored", int(time.time()))
        self.failUnless("Z" in t2)

    def test_secrets_dir(self):
        basedir = "test_node/test_secrets_dir"
        fileutil.make_dirs(basedir)
        n = TestNode(basedir)
        self.failUnless(isinstance(n, TestNode))
        self.failUnless(os.path.exists(os.path.join(basedir, "private")))

    def test_secrets_dir_protected(self):
        if "win32" in sys.platform.lower() or "cygwin" in sys.platform.lower():
            # We don't know how to test that unprivileged users can't read this
            # thing.  (Also we don't know exactly how to set the permissions so
            # that unprivileged users can't read this thing.)
            raise unittest.SkipTest("We don't know how to set permissions on Windows.")
        basedir = "test_node/test_secrets_dir_protected"
        fileutil.make_dirs(basedir)
        n = TestNode(basedir)
        self.failUnless(isinstance(n, TestNode))
        privdir = os.path.join(basedir, "private")
        st = os.stat(privdir)
        bits = stat.S_IMODE(st[stat.ST_MODE])
        self.failUnless(bits & 0001 == 0, bits)

    def test_logdir_is_str(self):
        basedir = "test_node/test_logdir_is_str"
        fileutil.make_dirs(basedir)

        ns = Namespace()
        ns.called = False
        def call_setLogDir(logdir):
            ns.called = True
            self.failUnless(isinstance(logdir, str), logdir)
        self.patch(foolscap.logging.log, 'setLogDir', call_setLogDir)

        TestNode(basedir)
        self.failUnless(ns.called)

class EmptyNode(Node):
    def __init__(self):
        config = config_from_string("", "no portfile")
        Node.__init__(self, config, 'no basedir')

EXPECTED = {
    # top-level key is tub.port category
    "missing": {
        # 2nd-level key is tub.location category
        "missing": "alloc/auto",
        "empty": "ERR2",
        "disabled": "ERR4",
        "hintstring": "alloc/file",
        },
    "empty": {
        "missing": "ERR1",
        "empty": "ERR1",
        "disabled": "ERR1",
        "hintstring": "ERR1",
        },
    "disabled": {
        "missing": "ERR3",
        "empty": "ERR2",
        "disabled": "no-listen",
        "hintstring": "ERR3",
        },
    "endpoint": {
        "missing": "auto",
        "empty": "ERR2",
        "disabled": "ERR4",
        "hintstring": "manual",
        },
    }

class PortLocation(unittest.TestCase):
    def test_all(self):
        for tp in EXPECTED.keys():
            for tl in EXPECTED[tp].keys():
                exp = EXPECTED[tp][tl]
                self._try(tp, tl, exp)

    def _try(self, tp, tl, exp):
        log.msg("PortLocation._try:", tp, tl, exp)
        cfg_tubport = {"missing": None,
                       "empty": "",
                       "disabled": "disabled",
                       "endpoint": "tcp:777",
                       }[tp]
        cfg_location = {"missing": None,
                        "empty": "",
                        "disabled": "disabled",
                        "hintstring": "tcp:HOST:888,AUTO",
                        }[tl]

        n = EmptyNode()
        basedir = os.path.join("test_node/portlocation/%s/%s" % (tp, tl))
        fileutil.make_dirs(basedir)
        config = n.config = read_config(
            basedir,
            "node.port",
            _valid_config_sections=_valid_config_sections,
        )
        n._reveal_ip = True

        if exp in ("ERR1", "ERR2", "ERR3", "ERR4"):
            e = self.assertRaises(ValueError, n.get_tub_portlocation,
                                  cfg_tubport, cfg_location)
            if exp == "ERR1":
                self.assertEqual("tub.port must not be empty", str(e))
            elif exp == "ERR2":
                self.assertEqual("tub.location must not be empty", str(e))
            elif exp == "ERR3":
                self.assertEqual("tub.port is disabled, but not tub.location",
                                 str(e))
            elif exp == "ERR4":
                self.assertEqual("tub.location is disabled, but not tub.port",
                                 str(e))
            else:
                self.assert_(False)
        elif exp == "no-listen":
            res = n.get_tub_portlocation(cfg_tubport, cfg_location)
            self.assertEqual(res, None)
        elif exp in ("alloc/auto", "alloc/file", "auto", "manual"):
            with mock.patch("allmydata.util.iputil.get_local_addresses_sync",
                            return_value=["LOCAL"]):
                with mock.patch("allmydata.util.iputil.allocate_tcp_port",
                                return_value=999):
                    port, location = n.get_tub_portlocation(cfg_tubport,
                                                            cfg_location)
            try:
                with open(config.portnum_fname, "r") as f:
                    saved_port = f.read().strip()
            except EnvironmentError:
                saved_port = None
            if exp == "alloc/auto":
                self.assertEqual(port, "tcp:999")
                self.assertEqual(location, "tcp:LOCAL:999")
                self.assertEqual(saved_port, "tcp:999")
            elif exp == "alloc/file":
                self.assertEqual(port, "tcp:999")
                self.assertEqual(location, "tcp:HOST:888,tcp:LOCAL:999")
                self.assertEqual(saved_port, "tcp:999")
            elif exp == "auto":
                self.assertEqual(port, "tcp:777")
                self.assertEqual(location, "tcp:LOCAL:777")
                self.assertEqual(saved_port, None)
            elif exp == "manual":
                self.assertEqual(port, "tcp:777")
                self.assertEqual(location, "tcp:HOST:888,tcp:LOCAL:777")
                self.assertEqual(saved_port, None)
            else:
                self.assert_(False)
        else:
            self.assert_(False)

BASE_CONFIG = """
[client]
introducer.furl = empty
[tor]
enabled = false
[i2p]
enabled = false
[node]
"""

NOLISTEN = """
[node]
tub.port = disabled
tub.location = disabled
"""

DISABLE_STORAGE = """
[storage]
enabled = false
"""

ENABLE_STORAGE = """
[storage]
enabled = true
"""

ENABLE_HELPER = """
[helper]
enabled = true
"""

class FakeTub:
    def __init__(self):
        self.tubID = base64.b32encode("foo")
        self.listening_ports = []
    def setOption(self, name, value): pass
    def removeAllConnectionHintHandlers(self): pass
    def addConnectionHintHandler(self, hint_type, handler): pass
    def listenOn(self, what):
        self.listening_ports.append(what)
    def setLocation(self, location): pass
    def setServiceParent(self, parent): pass

class Listeners(unittest.TestCase):
    def test_multiple_ports(self):
        n = EmptyNode()
        n.basedir = self.mktemp()
        n.config_fname = os.path.join(n.basedir, "tahoe.cfg")
        os.mkdir(n.basedir)
        os.mkdir(os.path.join(n.basedir, "private"))
        port1 = iputil.allocate_tcp_port()
        port2 = iputil.allocate_tcp_port()
        port = ("tcp:%d:interface=127.0.0.1,tcp:%d:interface=127.0.0.1" %
                (port1, port2))
        location = "tcp:localhost:%d,tcp:localhost:%d" % (port1, port2)
        with open(n.config_fname, "w") as f:
            f.write(BASE_CONFIG)
            f.write("tub.port = %s\n" % port)
            f.write("tub.location = %s\n" % location)
        # we're doing a lot of calling-into-setup-methods here, it might be
        # better to just create a real Node instance, I'm not sure.
        n.config = read_config(
            n.basedir,
            "client.port",
            _valid_config_sections=_valid_config_sections,
        )
        n.check_privacy()
        n.services = []
        n.create_i2p_provider()
        n.create_tor_provider()
        n.init_connections()
        n.set_tub_options()
        t = FakeTub()
        with mock.patch("allmydata.node.Tub", return_value=t):
            n.create_main_tub()
        self.assertEqual(t.listening_ports,
                         ["tcp:%d:interface=127.0.0.1" % port1,
                          "tcp:%d:interface=127.0.0.1" % port2])

    def test_tor_i2p_listeners(self):
        n = EmptyNode()
        n.basedir = self.mktemp()
        n.config_fname = os.path.join(n.basedir, "tahoe.cfg")
        os.mkdir(n.basedir)
        os.mkdir(os.path.join(n.basedir, "private"))
        with open(n.config_fname, "w") as f:
            f.write(BASE_CONFIG)
            f.write("tub.port = listen:i2p,listen:tor\n")
            f.write("tub.location = tcp:example.org:1234\n")
        # we're doing a lot of calling-into-setup-methods here, it might be
        # better to just create a real Node instance, I'm not sure.
        n.config = read_config(
            n.basedir,
            "client.port",
            _valid_config_sections=_valid_config_sections,
        )
        n.check_privacy()
        n.services = []
        i2p_ep = object()
        tor_ep = object()
        n._i2p_provider = mock.Mock()
        n._i2p_provider.get_listener = mock.Mock(return_value=i2p_ep)
        n._tor_provider = mock.Mock()
        n._tor_provider.get_listener = mock.Mock(return_value=tor_ep)
        n.init_connections()
        n.set_tub_options()
        t = FakeTub()
        with mock.patch("allmydata.node.Tub", return_value=t):
            n.create_main_tub()
        self.assertEqual(n._i2p_provider.get_listener.mock_calls, [mock.call()])
        self.assertEqual(n._tor_provider.get_listener.mock_calls, [mock.call()])
        self.assertEqual(t.listening_ports, [i2p_ep, tor_ep])

class ClientNotListening(unittest.TestCase):
    def test_disabled(self):
        basedir = "test_node/test_disabled"
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write(BASE_CONFIG)
        f.write(NOLISTEN)
        f.write(DISABLE_STORAGE)
        f.close()
        n = create_client(basedir)
        self.assertEqual(n.tub.getListeners(), [])

    def test_disabled_but_storage(self):
        basedir = "test_node/test_disabled_but_storage"
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write(BASE_CONFIG)
        f.write(NOLISTEN)
        f.write(ENABLE_STORAGE)
        f.close()
        e = self.assertRaises(ValueError, create_client, basedir)
        self.assertIn("storage is enabled, but tub is not listening", str(e))

    def test_disabled_but_helper(self):
        basedir = "test_node/test_disabled_but_helper"
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write(BASE_CONFIG)
        f.write(NOLISTEN)
        f.write(DISABLE_STORAGE)
        f.write(ENABLE_HELPER)
        f.close()
        e = self.assertRaises(ValueError, create_client, basedir)
        self.assertIn("helper is enabled, but tub is not listening", str(e))

class IntroducerNotListening(unittest.TestCase):
    def test_port_none_introducer(self):
        basedir = "test_node/test_port_none_introducer"
        fileutil.make_dirs(basedir)
        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
        f.write("[node]\n")
        f.write("tub.port = disabled\n")
        f.write("tub.location = disabled\n")
        f.close()
        e = self.assertRaises(ValueError, create_introducer, basedir)
        self.assertIn("we are Introducer, but tub is not listening", str(e))

class Configuration(unittest.TestCase):

    def setUp(self):
        self.basedir = self.mktemp()
        fileutil.make_dirs(self.basedir)

    def test_read_invalid_config(self):
        with open(os.path.join(self.basedir, 'tahoe.cfg'), 'w') as f:
            f.write(
                '[invalid section]\n'
                'foo = bar\n'
            )
        with self.assertRaises(UnknownConfigError) as ctx:
            read_config(
                self.basedir,
                "client.port",
                _valid_config_sections=_valid_config_sections,
            )

        self.assertIn(
            "invalid section",
            str(ctx.exception),
        )

    def test_create_client_invalid_config(self):
        with open(os.path.join(self.basedir, 'tahoe.cfg'), 'w') as f:
            f.write(
                '[invalid section]\n'
                'foo = bar\n'
            )
        with self.assertRaises(UnknownConfigError) as ctx:
            create_client(self.basedir)

        self.assertIn(
            "invalid section",
            str(ctx.exception),
        )