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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test for L{twisted.web.proxy}.
"""
from twisted.trial.unittest import TestCase
from twisted.test.proto_helpers import StringTransportWithDisconnection
from twisted.test.proto_helpers import MemoryReactor
from twisted.web.resource import Resource
from twisted.web.server import Site
from twisted.web.proxy import ReverseProxyResource, ProxyClientFactory
from twisted.web.proxy import ProxyClient, ProxyRequest, ReverseProxyRequest
from twisted.web.test.test_web import DummyRequest
class ReverseProxyResourceTests(TestCase):
"""
Tests for L{ReverseProxyResource}.
"""
def _testRender(self, uri, expectedURI):
"""
Check that a request pointing at C{uri} produce a new proxy connection,
with the path of this request pointing at C{expectedURI}.
"""
root = Resource()
reactor = MemoryReactor()
resource = ReverseProxyResource(u"127.0.0.1", 1234, b"/path", reactor)
root.putChild(b'index', resource)
site = Site(root)
transport = StringTransportWithDisconnection()
channel = site.buildProtocol(None)
channel.makeConnection(transport)
# Clear the timeout if the tests failed
self.addCleanup(channel.connectionLost, None)
channel.dataReceived(b"GET " +
uri +
b" HTTP/1.1\r\nAccept: text/html\r\n\r\n")
# Check that one connection has been created, to the good host/port
self.assertEqual(len(reactor.tcpClients), 1)
self.assertEqual(reactor.tcpClients[0][0], u"127.0.0.1")
self.assertEqual(reactor.tcpClients[0][1], 1234)
# Check the factory passed to the connect, and its given path
factory = reactor.tcpClients[0][2]
self.assertIsInstance(factory, ProxyClientFactory)
self.assertEqual(factory.rest, expectedURI)
self.assertEqual(factory.headers[b"host"], b"127.0.0.1:1234")
def test_render(self):
"""
Test that L{ReverseProxyResource.render} initiates a connection to the
given server with a L{ProxyClientFactory} as parameter.
"""
return self._testRender(b"/index", b"/path")
def test_renderWithQuery(self):
"""
Test that L{ReverseProxyResource.render} passes query parameters to the
created factory.
"""
return self._testRender(b"/index?foo=bar", b"/path?foo=bar")
def test_getChild(self):
"""
The L{ReverseProxyResource.getChild} method should return a resource
instance with the same class as the originating resource, forward
port, host, and reactor values, and update the path value with the
value passed.
"""
reactor = MemoryReactor()
resource = ReverseProxyResource(u"127.0.0.1", 1234, b"/path", reactor)
child = resource.getChild(b'foo', None)
# The child should keep the same class
self.assertIsInstance(child, ReverseProxyResource)
self.assertEqual(child.path, b"/path/foo")
self.assertEqual(child.port, 1234)
self.assertEqual(child.host, u"127.0.0.1")
self.assertIdentical(child.reactor, resource.reactor)
def test_getChildWithSpecial(self):
"""
The L{ReverseProxyResource} return by C{getChild} has a path which has
already been quoted.
"""
resource = ReverseProxyResource(u"127.0.0.1", 1234, b"/path")
child = resource.getChild(b' /%', None)
self.assertEqual(child.path, b"/path/%20%2F%25")
class DummyChannel(object):
"""
A dummy HTTP channel, that does nothing but holds a transport and saves
connection lost.
@ivar transport: the transport used by the client.
@ivar lostReason: the reason saved at connection lost.
"""
def __init__(self, transport):
"""
Hold a reference to the transport.
"""
self.transport = transport
self.lostReason = None
def connectionLost(self, reason):
"""
Keep track of the connection lost reason.
"""
self.lostReason = reason
class ProxyClientTests(TestCase):
"""
Tests for L{ProxyClient}.
"""
def _parseOutHeaders(self, content):
"""
Parse the headers out of some web content.
@param content: Bytes received from a web server.
@return: A tuple of (requestLine, headers, body). C{headers} is a dict
of headers, C{requestLine} is the first line (e.g. "POST /foo ...")
and C{body} is whatever is left.
"""
headers, body = content.split(b'\r\n\r\n')
headers = headers.split(b'\r\n')
requestLine = headers.pop(0)
return (
requestLine, dict(header.split(b': ') for header in headers), body)
def makeRequest(self, path):
"""
Make a dummy request object for the URL path.
@param path: A URL path, beginning with a slash.
@return: A L{DummyRequest}.
"""
return DummyRequest(path)
def makeProxyClient(self, request, method=b"GET", headers=None,
requestBody=b""):
"""
Make a L{ProxyClient} object used for testing.
@param request: The request to use.
@param method: The HTTP method to use, GET by default.
@param headers: The HTTP headers to use expressed as a dict. If not
provided, defaults to {'accept': 'text/html'}.
@param requestBody: The body of the request. Defaults to the empty
string.
@return: A L{ProxyClient}
"""
if headers is None:
headers = {b"accept": b"text/html"}
path = b'/' + request.postpath
return ProxyClient(
method, path, b'HTTP/1.0', headers, requestBody, request)
def connectProxy(self, proxyClient):
"""
Connect a proxy client to a L{StringTransportWithDisconnection}.
@param proxyClient: A L{ProxyClient}.
@return: The L{StringTransportWithDisconnection}.
"""
clientTransport = StringTransportWithDisconnection()
clientTransport.protocol = proxyClient
proxyClient.makeConnection(clientTransport)
return clientTransport
def assertForwardsHeaders(self, proxyClient, requestLine, headers):
"""
Assert that C{proxyClient} sends C{headers} when it connects.
@param proxyClient: A L{ProxyClient}.
@param requestLine: The request line we expect to be sent.
@param headers: A dict of headers we expect to be sent.
@return: If the assertion is successful, return the request body as
bytes.
"""
self.connectProxy(proxyClient)
requestContent = proxyClient.transport.value()
receivedLine, receivedHeaders, body = self._parseOutHeaders(
requestContent)
self.assertEqual(receivedLine, requestLine)
self.assertEqual(receivedHeaders, headers)
return body
def makeResponseBytes(self, code, message, headers, body):
lines = [b"HTTP/1.0 " + str(code).encode('ascii') + b' ' + message]
for header, values in headers:
for value in values:
lines.append(header + b': ' + value)
lines.extend([b'', body])
return b'\r\n'.join(lines)
def assertForwardsResponse(self, request, code, message, headers, body):
"""
Assert that C{request} has forwarded a response from the server.
@param request: A L{DummyRequest}.
@param code: The expected HTTP response code.
@param message: The expected HTTP message.
@param headers: The expected HTTP headers.
@param body: The expected response body.
"""
self.assertEqual(request.responseCode, code)
self.assertEqual(request.responseMessage, message)
receivedHeaders = list(request.responseHeaders.getAllRawHeaders())
receivedHeaders.sort()
expectedHeaders = headers[:]
expectedHeaders.sort()
self.assertEqual(receivedHeaders, expectedHeaders)
self.assertEqual(b''.join(request.written), body)
def _testDataForward(self, code, message, headers, body, method=b"GET",
requestBody=b"", loseConnection=True):
"""
Build a fake proxy connection, and send C{data} over it, checking that
it's forwarded to the originating request.
"""
request = self.makeRequest(b'foo')
client = self.makeProxyClient(
request, method, {b'accept': b'text/html'}, requestBody)
receivedBody = self.assertForwardsHeaders(
client, method + b' /foo HTTP/1.0',
{b'connection': b'close', b'accept': b'text/html'})
self.assertEqual(receivedBody, requestBody)
# Fake an answer
client.dataReceived(
self.makeResponseBytes(code, message, headers, body))
# Check that the response data has been forwarded back to the original
# requester.
self.assertForwardsResponse(request, code, message, headers, body)
# Check that when the response is done, the request is finished.
if loseConnection:
client.transport.loseConnection()
# Even if we didn't call loseConnection, the transport should be
# disconnected. This lets us not rely on the server to close our
# sockets for us.
self.assertFalse(client.transport.connected)
self.assertEqual(request.finished, 1)
def test_forward(self):
"""
When connected to the server, L{ProxyClient} should send the saved
request, with modifications of the headers, and then forward the result
to the parent request.
"""
return self._testDataForward(
200, b"OK", [(b"Foo", [b"bar", b"baz"])], b"Some data\r\n")
def test_postData(self):
"""
Try to post content in the request, and check that the proxy client
forward the body of the request.
"""
return self._testDataForward(
200, b"OK", [(b"Foo", [b"bar"])], b"Some data\r\n", b"POST", b"Some content")
def test_statusWithMessage(self):
"""
If the response contains a status with a message, it should be
forwarded to the parent request with all the information.
"""
return self._testDataForward(
404, b"Not Found", [], b"")
def test_contentLength(self):
"""
If the response contains a I{Content-Length} header, the inbound
request object should still only have C{finish} called on it once.
"""
data = b"foo bar baz"
return self._testDataForward(
200,
b"OK",
[(b"Content-Length", [str(len(data)).encode('ascii')])],
data)
def test_losesConnection(self):
"""
If the response contains a I{Content-Length} header, the outgoing
connection is closed when all response body data has been received.
"""
data = b"foo bar baz"
return self._testDataForward(
200,
b"OK",
[(b"Content-Length", [str(len(data)).encode('ascii')])],
data,
loseConnection=False)
def test_headersCleanups(self):
"""
The headers given at initialization should be modified:
B{proxy-connection} should be removed if present, and B{connection}
should be added.
"""
client = ProxyClient(b'GET', b'/foo', b'HTTP/1.0',
{b"accept": b"text/html", b"proxy-connection": b"foo"}, b'', None)
self.assertEqual(client.headers,
{b"accept": b"text/html", b"connection": b"close"})
def test_keepaliveNotForwarded(self):
"""
The proxy doesn't really know what to do with keepalive things from
the remote server, so we stomp over any keepalive header we get from
the client.
"""
headers = {
b"accept": b"text/html",
b'keep-alive': b'300',
b'connection': b'keep-alive',
}
expectedHeaders = headers.copy()
expectedHeaders[b'connection'] = b'close'
del expectedHeaders[b'keep-alive']
client = ProxyClient(b'GET', b'/foo', b'HTTP/1.0', headers, b'', None)
self.assertForwardsHeaders(
client, b'GET /foo HTTP/1.0', expectedHeaders)
def test_defaultHeadersOverridden(self):
"""
L{server.Request} within the proxy sets certain response headers by
default. When we get these headers back from the remote server, the
defaults are overridden rather than simply appended.
"""
request = self.makeRequest(b'foo')
request.responseHeaders.setRawHeaders(b'server', [b'old-bar'])
request.responseHeaders.setRawHeaders(b'date', [b'old-baz'])
request.responseHeaders.setRawHeaders(b'content-type', [b"old/qux"])
client = self.makeProxyClient(request, headers={b'accept': b'text/html'})
self.connectProxy(client)
headers = {
b'Server': [b'bar'],
b'Date': [b'2010-01-01'],
b'Content-Type': [b'application/x-baz'],
}
client.dataReceived(
self.makeResponseBytes(200, b"OK", headers.items(), b''))
self.assertForwardsResponse(
request, 200, b'OK', list(headers.items()), b'')
class ProxyClientFactoryTests(TestCase):
"""
Tests for L{ProxyClientFactory}.
"""
def test_connectionFailed(self):
"""
Check that L{ProxyClientFactory.clientConnectionFailed} produces
a B{501} response to the parent request.
"""
request = DummyRequest([b'foo'])
factory = ProxyClientFactory(b'GET', b'/foo', b'HTTP/1.0',
{b"accept": b"text/html"}, '', request)
factory.clientConnectionFailed(None, None)
self.assertEqual(request.responseCode, 501)
self.assertEqual(request.responseMessage, b"Gateway error")
self.assertEqual(
list(request.responseHeaders.getAllRawHeaders()),
[(b"Content-Type", [b"text/html"])])
self.assertEqual(
b''.join(request.written),
b"<H1>Could not connect</H1>")
self.assertEqual(request.finished, 1)
def test_buildProtocol(self):
"""
L{ProxyClientFactory.buildProtocol} should produce a L{ProxyClient}
with the same values of attributes (with updates on the headers).
"""
factory = ProxyClientFactory(b'GET', b'/foo', b'HTTP/1.0',
{b"accept": b"text/html"}, b'Some data',
None)
proto = factory.buildProtocol(None)
self.assertIsInstance(proto, ProxyClient)
self.assertEqual(proto.command, b'GET')
self.assertEqual(proto.rest, b'/foo')
self.assertEqual(proto.data, b'Some data')
self.assertEqual(proto.headers,
{b"accept": b"text/html", b"connection": b"close"})
class ProxyRequestTests(TestCase):
"""
Tests for L{ProxyRequest}.
"""
def _testProcess(self, uri, expectedURI, method=b"GET", data=b""):
"""
Build a request pointing at C{uri}, and check that a proxied request
is created, pointing a C{expectedURI}.
"""
transport = StringTransportWithDisconnection()
channel = DummyChannel(transport)
reactor = MemoryReactor()
request = ProxyRequest(channel, False, reactor)
request.gotLength(len(data))
request.handleContentChunk(data)
request.requestReceived(method, b'http://example.com' + uri,
b'HTTP/1.0')
self.assertEqual(len(reactor.tcpClients), 1)
self.assertEqual(reactor.tcpClients[0][0], u"example.com")
self.assertEqual(reactor.tcpClients[0][1], 80)
factory = reactor.tcpClients[0][2]
self.assertIsInstance(factory, ProxyClientFactory)
self.assertEqual(factory.command, method)
self.assertEqual(factory.version, b'HTTP/1.0')
self.assertEqual(factory.headers, {b'host': b'example.com'})
self.assertEqual(factory.data, data)
self.assertEqual(factory.rest, expectedURI)
self.assertEqual(factory.father, request)
def test_process(self):
"""
L{ProxyRequest.process} should create a connection to the given server,
with a L{ProxyClientFactory} as connection factory, with the correct
parameters:
- forward comment, version and data values
- update headers with the B{host} value
- remove the host from the URL
- pass the request as parent request
"""
return self._testProcess(b"/foo/bar", b"/foo/bar")
def test_processWithoutTrailingSlash(self):
"""
If the incoming request doesn't contain a slash,
L{ProxyRequest.process} should add one when instantiating
L{ProxyClientFactory}.
"""
return self._testProcess(b"", b"/")
def test_processWithData(self):
"""
L{ProxyRequest.process} should be able to retrieve request body and
to forward it.
"""
return self._testProcess(
b"/foo/bar", b"/foo/bar", b"POST", b"Some content")
def test_processWithPort(self):
"""
Check that L{ProxyRequest.process} correctly parse port in the incoming
URL, and create a outgoing connection with this port.
"""
transport = StringTransportWithDisconnection()
channel = DummyChannel(transport)
reactor = MemoryReactor()
request = ProxyRequest(channel, False, reactor)
request.gotLength(0)
request.requestReceived(b'GET', b'http://example.com:1234/foo/bar',
b'HTTP/1.0')
# That should create one connection, with the port parsed from the URL
self.assertEqual(len(reactor.tcpClients), 1)
self.assertEqual(reactor.tcpClients[0][0], u"example.com")
self.assertEqual(reactor.tcpClients[0][1], 1234)
class DummyFactory(object):
"""
A simple holder for C{host} and C{port} information.
"""
def __init__(self, host, port):
self.host = host
self.port = port
class ReverseProxyRequestTests(TestCase):
"""
Tests for L{ReverseProxyRequest}.
"""
def test_process(self):
"""
L{ReverseProxyRequest.process} should create a connection to its
factory host/port, using a L{ProxyClientFactory} instantiated with the
correct parameters, and particularly set the B{host} header to the
factory host.
"""
transport = StringTransportWithDisconnection()
channel = DummyChannel(transport)
reactor = MemoryReactor()
request = ReverseProxyRequest(channel, False, reactor)
request.factory = DummyFactory(u"example.com", 1234)
request.gotLength(0)
request.requestReceived(b'GET', b'/foo/bar', b'HTTP/1.0')
# Check that one connection has been created, to the good host/port
self.assertEqual(len(reactor.tcpClients), 1)
self.assertEqual(reactor.tcpClients[0][0], u"example.com")
self.assertEqual(reactor.tcpClients[0][1], 1234)
# Check the factory passed to the connect, and its headers
factory = reactor.tcpClients[0][2]
self.assertIsInstance(factory, ProxyClientFactory)
self.assertEqual(factory.headers, {b'host': b'example.com'})
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