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# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""Simplistic HTTP proxy support.
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This comes in two main variants - the Proxy and the ReverseProxy.
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When a Proxy is in use, a browser trying to connect to a server (say,
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www.yahoo.com) will be intercepted by the Proxy, and the proxy will covertly
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connect to the server, and return the result.
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When a ReverseProxy is in use, the client connects directly to the ReverseProxy
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(say, www.yahoo.com) which farms off the request to one of a pool of servers,
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and returns the result.
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Normally, a Proxy is used on the client end of an Internet connection, while a
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ReverseProxy is used on the server end.
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from twisted.internet import reactor, protocol
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from twisted.web import resource, server, http
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class ProxyClient(http.HTTPClient):
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"""Used by ProxyClientFactory to implement a simple web proxy."""
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def __init__(self, command, rest, version, headers, data, father):
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self.command = command
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if headers.has_key("proxy-connection"):
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del headers["proxy-connection"]
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headers["connection"] = "close"
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self.headers = headers
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def connectionMade(self):
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self.sendCommand(self.command, self.rest)
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for header, value in self.headers.items():
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self.sendHeader(header, value)
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self.transport.write(self.data)
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def handleStatus(self, version, code, message):
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self.father.transport.write("%s %s %s\r\n" % (version, code, message))
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def handleHeader(self, key, value):
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self.father.transport.write("%s: %s\r\n" % (key, value))
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def handleEndHeaders(self):
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self.father.transport.write("\r\n")
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def handleResponsePart(self, buffer):
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self.father.transport.write(buffer)
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def handleResponseEnd(self):
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self.transport.loseConnection()
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self.father.channel.transport.loseConnection()
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class ProxyClientFactory(protocol.ClientFactory):
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"""Used by ProxyRequest to implement a simple web proxy."""
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protocol = ProxyClient
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def __init__(self, command, rest, version, headers, data, father):
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self.command = command
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self.headers = headers
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self.version = version
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def buildProtocol(self, addr):
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return self.protocol(self.command, self.rest, self.version,
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self.headers, self.data, self.father)
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def clientConnectionFailed(self, connector, reason):
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self.father.transport.write("HTTP/1.0 501 Gateway error\r\n")
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self.father.transport.write("Content-Type: text/html\r\n")
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self.father.transport.write("\r\n")
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self.father.transport.write('''<H1>Could not connect</H1>''')
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class ProxyRequest(http.Request):
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"""Used by Proxy to implement a simple web proxy."""
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protocols = {'http': ProxyClientFactory}
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parsed = urlparse.urlparse(self.uri)
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port = self.ports[protocol]
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host, port = host.split(':')
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rest = urlparse.urlunparse(('','')+parsed[2:])
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class_ = self.protocols[protocol]
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headers = self.getAllHeaders().copy()
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if not headers.has_key('host'):
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headers['host'] = host
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self.content.seek(0, 0)
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s = self.content.read()
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clientFactory = class_(self.method, rest, self.clientproto, headers,
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reactor.connectTCP(host, port, clientFactory)
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class Proxy(http.HTTPChannel):
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"""This class implements a simple web proxy.
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Since it inherits from twisted.protocols.http.HTTPChannel, to use it you
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should do something like this::
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from twisted.web import http
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f = http.HTTPFactory()
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Make the HTTPFactory a listener on a port as per usual, and you have
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a fully-functioning web proxy!
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requestFactory = ProxyRequest
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class ReverseProxyRequest(http.Request):
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"""Used by ReverseProxy to implement a simple reverse proxy."""
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self.received_headers['host'] = self.factory.host
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clientFactory = ProxyClientFactory(self.method, self.uri,
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self.getAllHeaders(),
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self.content.read(), self)
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reactor.connectTCP(self.factory.host, self.factory.port,
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class ReverseProxy(http.HTTPChannel):
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"""Implements a simple reverse proxy.
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For details of usage, see the file examples/proxy.py"""
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requestFactory = ReverseProxyRequest
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class ReverseProxyResource(resource.Resource):
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"""Resource that renders the results gotten from another server
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Put this resource in the tree to cause everything below it to be relayed
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to a different server.
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def __init__(self, host, port, path):
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resource.Resource.__init__(self)
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def getChild(self, path, request):
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return ReverseProxyResource(self.host, self.port, self.path+'/'+path)
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def render(self, request):
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request.received_headers['host'] = self.host
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request.content.seek(0, 0)
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qs = urlparse.urlparse(request.uri)[4]
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rest = self.path + '?' + qs
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clientFactory = ProxyClientFactory(request.method, rest,
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request.getAllHeaders(),
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request.content.read(),
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reactor.connectTCP(self.host, self.port, clientFactory)
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return server.NOT_DONE_YET
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src/twisted/web/proxy.py
