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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.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.web.asynchronous
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:
client.fetch(req, handle_response)
except tornado.httpclient.HTTPError as e:
if hasattr(e, 'response') and e.response:
self.handle_response(e.response)
else:
self.set_status(500)
self.write('Internal server error:\n' + str(e))
self.finish()
@tornado.web.asynchronous
def post(self):
return self.get()
@tornado.web.asynchronous
def connect(self):
host, port = self.request.uri.split(':')
client = self.request.connection.stream
def read_from_client(data):
upstream.write(data)
def read_from_upstream(data):
client.write(data)
def client_close(data=None):
if upstream.closed():
return
if data:
upstream.write(data)
upstream.close()
def upstream_close(data=None):
if client.closed():
return
if data:
client.write(data)
client.close()
def start_tunnel():
client.read_until_close(client_close, read_from_client)
upstream.read_until_close(upstream_close, read_from_upstream)
client.write(b'HTTP/1.0 200 Connection established\r\n\r\n')
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
upstream = tornado.iostream.IOStream(s)
upstream.connect((host, int(port)), start_tunnel)
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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