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add proxy, fix smart contract refactor bug
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| #!/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 asyncio | ||
| import os | ||
| import sys | ||
| import socket | ||
| if sys.version_info[0] == 2: | ||
| from urlparse import urlparse | ||
| else: | ||
| from urllib.parse import urlparse | ||
|
|
||
| import tornado.httpserver | ||
| import tornado.ioloop | ||
| import tornado.iostream | ||
| import tornado.web | ||
| import tornado.httpclient | ||
| import tornado.httputil | ||
| from yadacoin.core.config import get_config | ||
|
|
||
|
|
||
| __all__ = ['ProxyHandler'] | ||
|
|
||
|
|
||
| def get_proxy(url): | ||
| url_parsed = urlparse(url, scheme='http') | ||
| proxy_key = '%s_proxy' % url_parsed.scheme | ||
| return os.environ.get(proxy_key) | ||
|
|
||
|
|
||
| def parse_proxy(proxy): | ||
| proxy_parsed = urlparse(proxy, scheme='http') | ||
| return proxy_parsed.hostname, proxy_parsed.port | ||
|
|
||
|
|
||
| def fetch_request(url, **kwargs): | ||
| proxy = get_proxy(url) | ||
| if proxy: | ||
| get_config().app_log.debug('Forward request via upstream proxy %s', proxy) | ||
| tornado.httpclient.AsyncHTTPClient.configure( | ||
| 'tornado.curl_httpclient.CurlAsyncHTTPClient') | ||
| host, port = parse_proxy(proxy) | ||
| kwargs['proxy_host'] = host | ||
| kwargs['proxy_port'] = port | ||
|
|
||
| req = tornado.httpclient.HTTPRequest(url, **kwargs) | ||
| client = tornado.httpclient.AsyncHTTPClient() | ||
| return client.fetch(req, raise_error=False) | ||
|
|
||
|
|
||
| class ProxyHandler(tornado.web.RequestHandler): | ||
| SUPPORTED_METHODS = ['GET', 'POST', 'CONNECT'] | ||
|
|
||
| def compute_etag(self): | ||
| return None # disable tornado Etag | ||
|
|
||
| async def get(self): | ||
| get_config().app_log.debug('Handle %s request to %s', self.request.method, | ||
| self.request.uri) | ||
|
|
||
| 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)) | ||
| else: | ||
| self.set_status(response.code, response.reason) | ||
| self._headers = tornado.httputil.HTTPHeaders() # clear tornado default header | ||
|
|
||
| for header, v in response.headers.get_all(): | ||
| if header not in ('Content-Length', 'Transfer-Encoding', 'Content-Encoding', 'Connection'): | ||
| self.add_header(header, v) # some header appear multiple times, eg 'Set-Cookie' | ||
|
|
||
| if response.body: | ||
| self.set_header('Content-Length', len(response.body)) | ||
| self.write(response.body) | ||
| self.finish() | ||
|
|
||
| body = self.request.body | ||
| if not body: | ||
| body = None | ||
| try: | ||
| if 'Proxy-Connection' in self.request.headers: | ||
| del self.request.headers['Proxy-Connection'] | ||
| resp = await fetch_request( | ||
| self.request.uri, | ||
| method=self.request.method, body=body, | ||
| headers=self.request.headers, follow_redirects=False, | ||
| allow_nonstandard_methods=True) | ||
| handle_response(resp) | ||
| except tornado.httpclient.HTTPError as e: | ||
| if hasattr(e, 'response') and e.response: | ||
| handle_response(e.response) | ||
| else: | ||
| self.set_status(500) | ||
| self.write('Internal server error:\n' + str(e)) | ||
| self.finish() | ||
|
|
||
| async def post(self): | ||
| return await self.get() | ||
|
|
||
| async def connect(self): | ||
| config = get_config() | ||
| config.app_log.debug('Start CONNECT to %s', self.request.uri) | ||
| host, port = self.request.uri.split(':') | ||
| client = self.request.connection.stream | ||
|
|
||
| async def relay(reader, writer): | ||
| try: | ||
| alldata = b'' | ||
| while True: | ||
| data = await reader.read_bytes(1024*64, partial=True) | ||
| if writer.closed(): | ||
| get_config().app_log.debug(alldata) | ||
| return | ||
| if data: | ||
| alldata += data | ||
| writer.write(data) | ||
| else: | ||
| break | ||
| get_config().app_log.debug(alldata) | ||
| except tornado.iostream.StreamClosedError: | ||
| pass | ||
|
|
||
| async def start_tunnel(): | ||
| get_config().app_log.debug('CONNECT tunnel established to %s', self.request.uri) | ||
| client.write(b'HTTP/1.0 407 Proxy Authentication Required\r\n') | ||
| client.write(b'Proxy-Authenticate: Basic realm="Access to internal site"\r\n\r\n') | ||
| await asyncio.gather( | ||
| relay(client, upstream), | ||
| relay(upstream, client) | ||
| ) | ||
| client.close() | ||
| upstream.close() | ||
|
|
||
| async def on_proxy_response(data=None): | ||
| if data: | ||
| first_line = data.splitlines()[0] | ||
| http_v, status, text = first_line.split(None, 2) | ||
| if int(status) == 200: | ||
| get_config().app_log.debug('Connected to upstream proxy %s', proxy) | ||
| await start_tunnel() | ||
| return | ||
|
|
||
| self.set_status(500) | ||
| self.finish() | ||
|
|
||
| async def start_proxy_tunnel(): | ||
| upstream.write('CONNECT %s HTTP/1.1\r\n' % self.request.uri) | ||
| upstream.write('Host: %s\r\n' % self.request.uri) | ||
| upstream.write('Proxy-Connection: Keep-Alive\r\n\r\n') | ||
| data = await upstream.read_until('\r\n\r\n') | ||
| on_proxy_response(data) | ||
|
|
||
| s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) | ||
| upstream = tornado.iostream.IOStream(s) | ||
|
|
||
| proxy = get_proxy(self.request.uri) | ||
| if proxy: | ||
| proxy_host, proxy_port = parse_proxy(proxy) | ||
| await upstream.connect((proxy_host, proxy_port)) | ||
| await start_proxy_tunnel() | ||
| else: | ||
| await upstream.connect((host, int(port))) | ||
| await start_tunnel() |