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- #!/usr/bin/env python
- #
- # Simple asynchronous HTTP proxy with tunnelling (CONNECT).
- #
- # GET/POST proxying based on
- # http://groups.google.com/group/python-tornado/msg/7bea08e7a049cf26
- #
- # Copyright (C) 2012 Senko Rasic <senko.rasic@dobarkod.hr>
- #
- # Permission is hereby granted, free of charge, to any person obtaining a copy
- # of this software and associated documentation files (the "Software"), to deal
- # in the Software without restriction, including without limitation the rights
- # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- # copies of the Software, and to permit persons to whom the Software is
- # furnished to do so, subject to the following conditions:
- #
- # The above copyright notice and this permission notice shall be included in
- # all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- # THE SOFTWARE.
- import sys
- import socket
- import tornado.gen
- import tornado.httpserver
- import tornado.ioloop
- import tornado.iostream
- import tornado.web
- import tornado.httpclient
- __all__ = ["ProxyHandler", "run_proxy"]
- class ProxyHandler(tornado.web.RequestHandler):
- SUPPORTED_METHODS = ["GET", "POST", "CONNECT"]
- @tornado.gen.coroutine
- def get(self):
- def handle_response(response):
- if response.error and not isinstance(
- response.error, tornado.httpclient.HTTPError
- ):
- self.set_status(500)
- self.write("Internal server error:\n" + str(response.error))
- self.finish()
- else:
- self.set_status(response.code)
- for header in (
- "Date",
- "Cache-Control",
- "Server",
- "Content-Type",
- "Location",
- ):
- v = response.headers.get(header)
- if v:
- self.set_header(header, v)
- if response.body:
- self.write(response.body)
- self.finish()
- req = tornado.httpclient.HTTPRequest(
- url=self.request.uri,
- method=self.request.method,
- body=self.request.body,
- headers=self.request.headers,
- follow_redirects=False,
- allow_nonstandard_methods=True,
- )
- client = tornado.httpclient.AsyncHTTPClient()
- try:
- response = yield client.fetch(req)
- yield handle_response(response)
- except tornado.httpclient.HTTPError as e:
- if hasattr(e, "response") and e.response:
- yield handle_response(e.response)
- else:
- self.set_status(500)
- self.write("Internal server error:\n" + str(e))
- self.finish()
- @tornado.gen.coroutine
- def post(self):
- yield self.get()
- @tornado.gen.coroutine
- def connect(self):
- host, port = self.request.uri.split(":")
- client = self.request.connection.stream
- @tornado.gen.coroutine
- def start_forward(reader, writer):
- while True:
- try:
- data = yield reader.read_bytes(4096, partial=True)
- except tornado.iostream.StreamClosedError:
- break
- if not data:
- break
- writer.write(data)
- writer.close()
- s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
- upstream = tornado.iostream.IOStream(s)
- yield upstream.connect((host, int(port)))
- client.write(b"HTTP/1.0 200 Connection established\r\n\r\n")
- fu1 = start_forward(client, upstream)
- fu2 = start_forward(upstream, client)
- yield [fu1, fu2]
- def run_proxy(port, start_ioloop=True):
- """
- Run proxy on the specified port. If start_ioloop is True (default),
- the tornado IOLoop will be started immediately.
- """
- app = tornado.web.Application([(r".*", ProxyHandler)])
- app.listen(port)
- ioloop = tornado.ioloop.IOLoop.instance()
- if start_ioloop:
- ioloop.start()
- if __name__ == "__main__":
- port = 8888
- if len(sys.argv) > 1:
- port = int(sys.argv[1])
- print("Starting HTTP proxy on port %d" % port)
- run_proxy(port)
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