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# -*- test-case-name: twisted.web.test.test_proxy -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
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"<H1>Could not connect</H1>")
        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

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
_auth Folder 0755
test Folder 0755
__init__.py File 699 B 0644
_element.py File 5.81 KB 0644
_flatten.py File 15.54 KB 0644
_http2.py File 48 KB 0644
_newclient.py File 61.84 KB 0644
_responses.py File 3.57 KB 0644
_stan.py File 10.54 KB 0644
client.py File 74.26 KB 0644
demo.py File 554 B 0644
distrib.py File 11.45 KB 0644
domhelpers.py File 8.44 KB 0644
error.py File 12.49 KB 0644
guard.py File 630 B 0644
html.py File 1.52 KB 0644
http.py File 96.91 KB 0644
http_headers.py File 8.04 KB 0644
iweb.py File 24.97 KB 0644
microdom.py File 35.35 KB 0644
proxy.py File 9.6 KB 0644
resource.py File 12.8 KB 0644
rewrite.py File 1.81 KB 0644
script.py File 5.61 KB 0644
server.py File 25.86 KB 0644
static.py File 35.12 KB 0644
sux.py File 20.4 KB 0644
tap.py File 8.73 KB 0644
template.py File 17.14 KB 0644
twcgi.py File 11.08 KB 0644
util.py File 12.12 KB 0644
vhost.py File 4.36 KB 0644
wsgi.py File 21.04 KB 0644
xmlrpc.py File 19.66 KB 0644