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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 urllib.parse import quote as urlquote, urlparse, urlunparse

from twisted.internet import reactor
from twisted.internet.protocol import ClientFactory
from twisted.web.http import _QUEUED_SENTINEL, HTTPChannel, HTTPClient, Request
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET


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.
    """

    # Type is wrong.  See: https://twistedmatrix.com/trac/ticket/10006
    protocol = ProxyClient  # type: ignore[assignment]

    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 = 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 = 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{bytes}
        """
        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 = "%s:%d" % (self.host, self.port)
        request.requestHeaders.setRawHeaders(b"host", [host.encode("ascii")])
        request.content.seek(0, 0)
        qs = 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