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import base64
import http.server as SimpleHTTPServer
import select
import socket
import socketserver as SocketServer
import threading
from urllib.request import urlopen
def pipe_sockets(sock1, sock2, timeout):
"""Pipe data from one socket to another and vice-versa."""
sockets = [sock1, sock2]
try:
while True:
rlist, _, xlist = select.select(sockets, [], sockets, timeout)
if xlist:
break
for sock in rlist:
data = sock.recv(8096)
if not data: # disconnected
break
other = next(s for s in sockets if s is not sock)
other.sendall(data)
except OSError:
pass
finally:
for sock in sockets:
sock.close()
class Future:
# concurrent.futures.Future docs say that they shouldn't be instantiated
# directly, so this is a simple implementation which mimics the Future
# which can safely be instantiated!
def __init__(self):
self._event = threading.Event()
self._result = None
self._exc = None
def result(self, timeout=None):
if not self._event.wait(timeout):
raise AssertionError("Future timed out")
if self._exc is not None:
raise self._exc
return self._result
def set_result(self, result):
self._result = result
self._event.set()
def set_exception(self, exception):
self._exc = exception
self._event.set()
class ProxyServerThread(threading.Thread):
spinup_timeout = 10
def __init__(self, timeout=None):
self.proxy_host = 'localhost'
self.proxy_port = None # randomly selected by OS
self.timeout = timeout
self.proxy_server = None
self.socket_created_future = Future()
self.requests = []
self.auth = None
super().__init__()
self.daemon = True
def reset(self):
self.requests.clear()
self.auth = None
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.stop()
self.join()
def set_auth(self, username, password):
self.auth = "%s:%s" % (username, password)
def get_proxy_url(self, with_scheme=True):
assert self.socket_created_future.result(self.spinup_timeout)
if self.auth:
auth = "%s@" % self.auth
else:
auth = ""
if with_scheme:
scheme = "http://"
else:
scheme = ""
return "%s%s%s:%s" % (scheme, auth, self.proxy_host, self.proxy_port)
def run(self):
assert not self.proxy_server, ("This class is not reentrable. "
"Please create a new instance.")
requests = self.requests
proxy_thread = self
class Proxy(SimpleHTTPServer.SimpleHTTPRequestHandler):
timeout = self.timeout
def check_auth(self):
if proxy_thread.auth is not None:
auth_header = self.headers.get('Proxy-Authorization')
b64_auth = base64.standard_b64encode(
proxy_thread.auth.encode()
).decode()
expected_auth = "Basic %s" % b64_auth
if auth_header != expected_auth:
self.send_response(401)
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(
(
"not authenticated. Expected %r, received %r"
% (expected_auth, auth_header)
).encode()
)
self.connection.close()
return False
return True
def do_GET(self):
if not self.check_auth():
return
requests.append(self.path)
req = urlopen(self.path, timeout=self.timeout)
self.send_response(req.getcode())
content_type = req.info().get('content-type', None)
if content_type:
self.send_header('Content-Type', content_type)
self.send_header('Connection', 'close')
self.end_headers()
self.copyfile(req, self.wfile)
self.connection.close()
req.close()
def do_CONNECT(self):
if not self.check_auth():
return
requests.append(self.path)
# Make a raw TCP connection to the target server
host, port = self.path.split(':')
try:
addr = host, int(port)
other_connection = \
socket.create_connection(addr, timeout=self.timeout)
except OSError:
self.send_error(502, 'Bad gateway')
return
# Respond that a tunnel has been created
self.send_response(200)
self.send_header('Connection', 'close')
self.end_headers()
pipe_sockets(self.connection, # it closes sockets
other_connection, self.timeout)
# ThreadingTCPServer offloads connections to separate threads, so
# the serve_forever loop doesn't block until connection is closed
# (unlike TCPServer). This allows to shutdown the serve_forever loop
# even if there's an open connection.
try:
self.proxy_server = SocketServer.ThreadingTCPServer(
(self.proxy_host, 0),
Proxy
)
# don't hang if there're some open connections
self.proxy_server.daemon_threads = True
self.proxy_port = self.proxy_server.server_address[1]
except Exception as e:
self.socket_created_future.set_exception(e)
raise
else:
self.socket_created_future.set_result(True)
self.proxy_server.serve_forever()
def stop(self):
self.proxy_server.shutdown() # stop serve_forever()
self.proxy_server.server_close()
class HttpServerThread(threading.Thread):
spinup_timeout = 10
def __init__(self, timeout=None):
self.server_host = 'localhost'
self.server_port = None # randomly selected by OS
self.timeout = timeout
self.http_server = None
self.socket_created_future = Future()
super().__init__()
self.daemon = True
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.stop()
self.join()
def get_server_url(self):
assert self.socket_created_future.result(self.spinup_timeout)
return "http://%s:%s" % (self.server_host, self.server_port)
def run(self):
assert not self.http_server, ("This class is not reentrable. "
"Please create a new instance.")
class Server(SimpleHTTPServer.SimpleHTTPRequestHandler):
timeout = self.timeout
def do_GET(self):
if self.path == "/":
self.send_response(200)
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(b"Hello world")
elif self.path == "/json":
self.send_response(200)
self.send_header('Content-type', 'application/json')
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(b'{"hello":"world"}')
elif self.path == "/json/plain":
self.send_response(200)
self.send_header('Content-type', 'text/plain;charset=utf-8')
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(b'{"hello":"world"}')
else:
self.send_response(404)
self.send_header('Connection', 'close')
self.send_header('X-test-header', 'hello')
self.end_headers()
self.wfile.write(b"Not found")
self.connection.close()
# ThreadingTCPServer offloads connections to separate threads, so
# the serve_forever loop doesn't block until connection is closed
# (unlike TCPServer). This allows to shutdown the serve_forever loop
# even if there's an open connection.
try:
self.http_server = SocketServer.ThreadingTCPServer(
(self.server_host, 0),
Server
)
# don't hang if there're some open connections
self.http_server.daemon_threads = True
self.server_port = self.http_server.server_address[1]
except Exception as e:
self.socket_created_future.set_exception(e)
raise
else:
self.socket_created_future.set_result(True)
self.http_server.serve_forever()
def stop(self):
self.http_server.shutdown() # stop serve_forever()
self.http_server.server_close()
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