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""" Simplistic HTTP proxy support. This comes in two main variants - the Proxy and the ReverseProxy. When a Proxy is in use, a browser trying to connect to a server (say, www.yahoo.com) will be intercepted by the Proxy, and the proxy will covertly connect to the server, and return the result. When a ReverseProxy is in use, the client connects directly to the ReverseProxy (say, www.yahoo.com) which farms off the request to one of a pool of servers, and returns the result. Normally, a Proxy is used on the client end of an Internet connection, while a ReverseProxy is used on the server end. """ from __future__ import absolute_import, division from twisted.python.compat import urllib_parse, urlquote from twisted.internet import reactor from twisted.internet.protocol import ClientFactory from twisted.web.resource import Resource from twisted.web.server import NOT_DONE_YET from twisted.web.http import HTTPClient, Request, HTTPChannel, _QUEUED_SENTINEL class ProxyClient(HTTPClient): """ Used by ProxyClientFactory to implement a simple web proxy. @ivar _finished: A flag which indicates whether or not the original request has been finished yet. """ _finished = False def __init__(self, command, rest, version, headers, data, father): self.father = father self.command = command self.rest = rest if b"proxy-connection" in headers: del headers[b"proxy-connection"] headers[b"connection"] = b"close" headers.pop(b'keep-alive', None) self.headers = headers self.data = data def connectionMade(self): self.sendCommand(self.command, self.rest) for header, value in self.headers.items(): self.sendHeader(header, value) self.endHeaders() self.transport.write(self.data) def handleStatus(self, version, code, message): self.father.setResponseCode(int(code), message) def handleHeader(self, key, value): # t.web.server.Request sets default values for these headers in its # 'process' method. When these headers are received from the remote # server, they ought to override the defaults, rather than append to # them. if key.lower() in [b'server', b'date', b'content-type']: self.father.responseHeaders.setRawHeaders(key, [value]) else: self.father.responseHeaders.addRawHeader(key, value) def handleResponsePart(self, buffer): self.father.write(buffer) def handleResponseEnd(self): """ Finish the original request, indicating that the response has been completely written to it, and disconnect the outgoing transport. """ if not self._finished: self._finished = True self.father.finish() self.transport.loseConnection() class ProxyClientFactory(ClientFactory): """ Used by ProxyRequest to implement a simple web proxy. """ protocol = ProxyClient def __init__(self, command, rest, version, headers, data, father): self.father = father self.command = command self.rest = rest self.headers = headers self.data = data self.version = version def buildProtocol(self, addr): return self.protocol(self.command, self.rest, self.version, self.headers, self.data, self.father) def clientConnectionFailed(self, connector, reason): """ Report a connection failure in a response to the incoming request as an error. """ self.father.setResponseCode(501, b"Gateway error") self.father.responseHeaders.addRawHeader(b"Content-Type", b"text/html") self.father.write(b"

Could not connect

") self.father.finish() class ProxyRequest(Request): """ Used by Proxy to implement a simple web proxy. @ivar reactor: the reactor used to create connections. @type reactor: object providing L{twisted.internet.interfaces.IReactorTCP} """ protocols = {b'http': ProxyClientFactory} ports = {b'http': 80} def __init__(self, channel, queued=_QUEUED_SENTINEL, reactor=reactor): Request.__init__(self, channel, queued) self.reactor = reactor def process(self): parsed = urllib_parse.urlparse(self.uri) protocol = parsed[0] host = parsed[1].decode('ascii') port = self.ports[protocol] if ':' in host: host, port = host.split(':') port = int(port) rest = urllib_parse.urlunparse((b'', b'') + parsed[2:]) if not rest: rest = rest + b'/' class_ = self.protocols[protocol] headers = self.getAllHeaders().copy() if b'host' not in headers: headers[b'host'] = host.encode('ascii') self.content.seek(0, 0) s = self.content.read() clientFactory = class_(self.method, rest, self.clientproto, headers, s, self) self.reactor.connectTCP(host, port, clientFactory) class Proxy(HTTPChannel): """ This class implements a simple web proxy. Since it inherits from L{twisted.web.http.HTTPChannel}, to use it you should do something like this:: from twisted.web import http f = http.HTTPFactory() f.protocol = Proxy Make the HTTPFactory a listener on a port as per usual, and you have a fully-functioning web proxy! """ requestFactory = ProxyRequest class ReverseProxyRequest(Request): """ Used by ReverseProxy to implement a simple reverse proxy. @ivar proxyClientFactoryClass: a proxy client factory class, used to create new connections. @type proxyClientFactoryClass: L{ClientFactory} @ivar reactor: the reactor used to create connections. @type reactor: object providing L{twisted.internet.interfaces.IReactorTCP} """ proxyClientFactoryClass = ProxyClientFactory def __init__(self, channel, queued=_QUEUED_SENTINEL, reactor=reactor): Request.__init__(self, channel, queued) self.reactor = reactor def process(self): """ Handle this request by connecting to the proxied server and forwarding it there, then forwarding the response back as the response to this request. """ self.requestHeaders.setRawHeaders(b"host", [self.factory.host.encode('ascii')]) clientFactory = self.proxyClientFactoryClass( self.method, self.uri, self.clientproto, self.getAllHeaders(), self.content.read(), self) self.reactor.connectTCP(self.factory.host, self.factory.port, clientFactory) class ReverseProxy(HTTPChannel): """ Implements a simple reverse proxy. For details of usage, see the file examples/reverse-proxy.py. """ requestFactory = ReverseProxyRequest class ReverseProxyResource(Resource): """ Resource that renders the results gotten from another server Put this resource in the tree to cause everything below it to be relayed to a different server. @ivar proxyClientFactoryClass: a proxy client factory class, used to create new connections. @type proxyClientFactoryClass: L{ClientFactory} @ivar reactor: the reactor used to create connections. @type reactor: object providing L{twisted.internet.interfaces.IReactorTCP} """ proxyClientFactoryClass = ProxyClientFactory def __init__(self, host, port, path, reactor=reactor): """ @param host: the host of the web server to proxy. @type host: C{str} @param port: the port of the web server to proxy. @type port: C{port} @param path: the base path to fetch data from. Note that you shouldn't put any trailing slashes in it, it will be added automatically in request. For example, if you put B{/foo}, a request on B{/bar} will be proxied to B{/foo/bar}. Any required encoding of special characters (such as " " or "/") should have been done already. @type path: C{str} """ Resource.__init__(self) self.host = host self.port = port self.path = path self.reactor = reactor def getChild(self, path, request): """ Create and return a proxy resource with the same proxy configuration as this one, except that its path also contains the segment given by C{path} at the end. """ return ReverseProxyResource( self.host, self.port, self.path + b'/' + urlquote(path, safe=b"").encode('utf-8'), self.reactor) def render(self, request): """ Render a request by forwarding it to the proxied server. """ # RFC 2616 tells us that we can omit the port if it's the default port, # but we have to provide it otherwise if self.port == 80: host = self.host else: host = self.host + u":" + str(self.port) request.requestHeaders.setRawHeaders(b"host", [host.encode('ascii')]) request.content.seek(0, 0) qs = urllib_parse.urlparse(request.uri)[4] if qs: rest = self.path + b'?' + qs else: rest = self.path clientFactory = self.proxyClientFactoryClass( request.method, rest, request.clientproto, request.getAllHeaders(), request.content.read(), request) self.reactor.connectTCP(self.host, self.port, clientFactory) return NOT_DONE_YET