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# Copyright (c) 2008-2010 Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Tests for L{twisted.web.distrib}.
"""

from os.path import abspath
from xml.dom.minidom import parseString
try:
    import pwd
except ImportError:
    pwd = None

from zope.interface.verify import verifyObject

from twisted.python import log, filepath
from twisted.internet import reactor, defer
from twisted.trial import unittest
from twisted.spread import pb
from twisted.spread.banana import SIZE_LIMIT
from twisted.web import http, distrib, client, resource, static, server
from twisted.web.test.test_web import DummyRequest
from twisted.web.test._util import _render


class MySite(server.Site):
    def stopFactory(self):
        if hasattr(self, "logFile"):
            if self.logFile != log.logfile:
                self.logFile.close()
            del self.logFile



class PBServerFactory(pb.PBServerFactory):
    """
    A PB server factory which keeps track of the most recent protocol it
    created.

    @ivar proto: L{None} or the L{Broker} instance most recently returned
        from C{buildProtocol}.
    """
    proto = None

    def buildProtocol(self, addr):
        self.proto = pb.PBServerFactory.buildProtocol(self, addr)
        return self.proto



class DistribTest(unittest.TestCase):
    port1 = None
    port2 = None
    sub = None
    f1 = None

    def tearDown(self):
        """
        Clean up all the event sources left behind by either directly by
        test methods or indirectly via some distrib API.
        """
        dl = [defer.Deferred(), defer.Deferred()]
        if self.f1 is not None and self.f1.proto is not None:
            self.f1.proto.notifyOnDisconnect(lambda: dl[0].callback(None))
        else:
            dl[0].callback(None)
        if self.sub is not None and self.sub.publisher is not None:
            self.sub.publisher.broker.notifyOnDisconnect(
                lambda: dl[1].callback(None))
            self.sub.publisher.broker.transport.loseConnection()
        else:
            dl[1].callback(None)
        http._logDateTimeStop()
        if self.port1 is not None:
            dl.append(self.port1.stopListening())
        if self.port2 is not None:
            dl.append(self.port2.stopListening())
        return defer.gatherResults(dl)


    def testDistrib(self):
        # site1 is the publisher
        r1 = resource.Resource()
        r1.putChild("there", static.Data("root", "text/plain"))
        site1 = server.Site(r1)
        self.f1 = PBServerFactory(distrib.ResourcePublisher(site1))
        self.port1 = reactor.listenTCP(0, self.f1)
        self.sub = distrib.ResourceSubscription("127.0.0.1",
                                                self.port1.getHost().port)
        r2 = resource.Resource()
        r2.putChild("here", self.sub)
        f2 = MySite(r2)
        self.port2 = reactor.listenTCP(0, f2)
        d = client.getPage("http://127.0.0.1:%d/here/there" % \
                           self.port2.getHost().port)
        d.addCallback(self.failUnlessEqual, 'root')
        return d


    def _requestTest(self, child, **kwargs):
        """
        Set up a resource on a distrib site using L{ResourcePublisher} and
        then retrieve it from a L{ResourceSubscription} via an HTTP client.

        @param child: The resource to publish using distrib.
        @param **kwargs: Extra keyword arguments to pass to L{getPage} when
            requesting the resource.

        @return: A L{Deferred} which fires with the result of the request.
        """
        distribRoot = resource.Resource()
        distribRoot.putChild("child", child)
        distribSite = server.Site(distribRoot)
        self.f1 = distribFactory = PBServerFactory(
            distrib.ResourcePublisher(distribSite))
        distribPort = reactor.listenTCP(
            0, distribFactory, interface="127.0.0.1")
        self.addCleanup(distribPort.stopListening)
        addr = distribPort.getHost()

        self.sub = mainRoot = distrib.ResourceSubscription(
            addr.host, addr.port)
        mainSite = server.Site(mainRoot)
        mainPort = reactor.listenTCP(0, mainSite, interface="127.0.0.1")
        self.addCleanup(mainPort.stopListening)
        mainAddr = mainPort.getHost()

        return client.getPage("http://%s:%s/child" % (
            mainAddr.host, mainAddr.port), **kwargs)



    def test_requestHeaders(self):
        """
        The request headers are available on the request object passed to a
        distributed resource's C{render} method.
        """
        requestHeaders = {}

        class ReportRequestHeaders(resource.Resource):
            def render(self, request):
                requestHeaders.update(dict(
                    request.requestHeaders.getAllRawHeaders()))
                return ""

        request = self._requestTest(
            ReportRequestHeaders(), headers={'foo': 'bar'})
        def cbRequested(result):
            self.assertEquals(requestHeaders['Foo'], ['bar'])
        request.addCallback(cbRequested)
        return request


    def test_largeWrite(self):
        """
        If a string longer than the Banana size limit is passed to the
        L{distrib.Request} passed to the remote resource, it is broken into
        smaller strings to be transported over the PB connection.
        """
        class LargeWrite(resource.Resource):
            def render(self, request):
                request.write('x' * SIZE_LIMIT + 'y')
                request.finish()
                return server.NOT_DONE_YET

        request = self._requestTest(LargeWrite())
        request.addCallback(self.assertEquals, 'x' * SIZE_LIMIT + 'y')
        return request


    def test_largeReturn(self):
        """
        Like L{test_largeWrite}, but for the case where C{render} returns a
        long string rather than explicitly passing it to L{Request.write}.
        """
        class LargeReturn(resource.Resource):
            def render(self, request):
                return 'x' * SIZE_LIMIT + 'y'

        request = self._requestTest(LargeReturn())
        request.addCallback(self.assertEquals, 'x' * SIZE_LIMIT + 'y')
        return request


    def test_connectionLost(self):
        """
        If there is an error issuing the request to the remote publisher, an
        error response is returned.
        """
        # Using pb.Root as a publisher will cause request calls to fail with an
        # error every time.  Just what we want to test.
        self.f1 = serverFactory = PBServerFactory(pb.Root())
        self.port1 = serverPort = reactor.listenTCP(0, serverFactory)

        self.sub = subscription = distrib.ResourceSubscription(
            "127.0.0.1", serverPort.getHost().port)
        request = DummyRequest([''])
        d = _render(subscription, request)
        def cbRendered(ignored):
            self.assertEqual(request.responseCode, 500)
            # This is the error we caused the request to fail with.  It should
            # have been logged.
            self.assertEqual(len(self.flushLoggedErrors(pb.NoSuchMethod)), 1)
        d.addCallback(cbRendered)
        return d



class _PasswordDatabase:
    def __init__(self, users):
        self._users = users


    def getpwall(self):
        return iter(self._users)


    def getpwnam(self, username):
        for user in self._users:
            if user[0] == username:
                return user
        raise KeyError()



class UserDirectoryTests(unittest.TestCase):
    """
    Tests for L{UserDirectory}, a resource for listing all user resources
    available on a system.
    """
    def setUp(self):
        self.alice = ('alice', 'x', 123, 456, 'Alice,,,', self.mktemp(), '/bin/sh')
        self.bob = ('bob', 'x', 234, 567, 'Bob,,,', self.mktemp(), '/bin/sh')
        self.database = _PasswordDatabase([self.alice, self.bob])
        self.directory = distrib.UserDirectory(self.database)


    def test_interface(self):
        """
        L{UserDirectory} instances provide L{resource.IResource}.
        """
        self.assertTrue(verifyObject(resource.IResource, self.directory))


    def _404Test(self, name):
        """
        Verify that requesting the C{name} child of C{self.directory} results
        in a 404 response.
        """
        request = DummyRequest([name])
        result = self.directory.getChild(name, request)
        d = _render(result, request)
        def cbRendered(ignored):
            self.assertEqual(request.responseCode, 404)
        d.addCallback(cbRendered)
        return d


    def test_getInvalidUser(self):
        """
        L{UserDirectory.getChild} returns a resource which renders a 404
        response when passed a string which does not correspond to any known
        user.
        """
        return self._404Test('carol')


    def test_getUserWithoutResource(self):
        """
        L{UserDirectory.getChild} returns a resource which renders a 404
        response when passed a string which corresponds to a known user who has
        neither a user directory nor a user distrib socket.
        """
        return self._404Test('alice')


    def test_getPublicHTMLChild(self):
        """
        L{UserDirectory.getChild} returns a L{static.File} instance when passed
        the name of a user with a home directory containing a I{public_html}
        directory.
        """
        home = filepath.FilePath(self.bob[-2])
        public_html = home.child('public_html')
        public_html.makedirs()
        request = DummyRequest(['bob'])
        result = self.directory.getChild('bob', request)
        self.assertIsInstance(result, static.File)
        self.assertEqual(result.path, public_html.path)


    def test_getDistribChild(self):
        """
        L{UserDirectory.getChild} returns a L{ResourceSubscription} instance
        when passed the name of a user suffixed with C{".twistd"} who has a
        home directory containing a I{.twistd-web-pb} socket.
        """
        home = filepath.FilePath(self.bob[-2])
        home.makedirs()
        web = home.child('.twistd-web-pb')
        request = DummyRequest(['bob'])
        result = self.directory.getChild('bob.twistd', request)
        self.assertIsInstance(result, distrib.ResourceSubscription)
        self.assertEqual(result.host, 'unix')
        self.assertEqual(abspath(result.port), web.path)


    def test_invalidMethod(self):
        """
        L{UserDirectory.render} raises L{UnsupportedMethod} in response to a
        non-I{GET} request.
        """
        request = DummyRequest([''])
        request.method = 'POST'
        self.assertRaises(
            server.UnsupportedMethod, self.directory.render, request)


    def test_render(self):
        """
        L{UserDirectory} renders a list of links to available user content
        in response to a I{GET} request.
        """
        public_html = filepath.FilePath(self.alice[-2]).child('public_html')
        public_html.makedirs()
        web = filepath.FilePath(self.bob[-2])
        web.makedirs()
        # This really only works if it's a unix socket, but the implementation
        # doesn't currently check for that.  It probably should someday, and
        # then skip users with non-sockets.
        web.child('.twistd-web-pb').setContent("")

        request = DummyRequest([''])
        result = _render(self.directory, request)
        def cbRendered(ignored):
            document = parseString(''.join(request.written))

            # Each user should have an li with a link to their page.
            [alice, bob] = document.getElementsByTagName('li')
            self.assertEqual(alice.firstChild.tagName, 'a')
            self.assertEqual(alice.firstChild.getAttribute('href'), 'alice/')
            self.assertEqual(alice.firstChild.firstChild.data, 'Alice (file)')
            self.assertEqual(bob.firstChild.tagName, 'a')
            self.assertEqual(bob.firstChild.getAttribute('href'), 'bob.twistd/')
            self.assertEqual(bob.firstChild.firstChild.data, 'Bob (twistd)')

        result.addCallback(cbRendered)
        return result


    def test_passwordDatabase(self):
        """
        If L{UserDirectory} is instantiated with no arguments, it uses the
        L{pwd} module as its password database.
        """
        directory = distrib.UserDirectory()
        self.assertIdentical(directory._pwd, pwd)
    if pwd is None:
        test_passwordDatabase.skip = "pwd module required"


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