text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  "HTTP Proxy Tools, pyOpenSSL version"
  
  _name = "ProxyTool"
  __author__ = 'phoenix'
  __version__ = '1.0'
  
  import time
  from datetime import datetime
  import logging
  import cgi
  import socket
  import select
  import selectors
  import ssl
  from http.server import HTTPServer, BaseHTTPRequestHandler
  from socketserver import ThreadingMixIn
  from CertTool import get_cert
  
  from colorama import init, Fore, Back, Style
  init(autoreset=True)
  
  logger = logging.getLogger('__main__')
  
  message_format = """\
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
  <html>
      <head>
          <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
          <title>Proxy Error: %(code)d</title>
      </head>
      <body>
          <h1>%(code)d: %(message)s</h1>
          <p>The following error occurred while trying to access <strong>%(url)s</strong></p>
          <p><strong>%(explain)s</strong></p>
          <hr>Generated on %(now)s by %(server)s.
      </body>
  </html>
  """
  
  def read_write(socket1, socket2):
      "Read and Write contents between 2 sockets, wait 5s for no data before return"
      start = time.time()
      with selectors.DefaultSelector() as selector:
          socket1.setblocking(False)
          socket2.setblocking(False)
          selector.register(socket1, selectors.EVENT_READ)
          selector.register(socket2, selectors.EVENT_READ)
          while True:
              tasks = selector.select(5)
              if not tasks: break
              for key, events in tasks:
                  if events & selectors.EVENT_READ:
                      reader = key.fileobj
                      writer = socket2 if reader is socket1 else socket1
                      try:
                          data = reader.recv(1024)
                          if data:
                              writer.sendall(data)
                          else:
                              # EOF
                              selector.unregister(reader)
                              selector.unregister(writer)
                      except (ConnectionAbortedError, ConnectionResetError, BrokenPipeError):
                          pass
          logger.debug("took %.2Fs" % (time.time()-start))
  
  def read_write(socket1, socket2, max_idling=10):
      "Read and Write contents between 2 sockets"
      iw = [socket1, socket2]
      ow = []
      count = 0
      while True:
          count += 1
          (ins, _, exs) = select.select(iw, ow, iw, 1)
          if exs: break
          if ins:
              for reader in ins:
                  writer = socket2 if reader is socket1 else socket1
                  try:
                      data = reader.recv(1024)
                      if data:
                          writer.send(data)
                          count = 0
                  except (ConnectionAbortedError, ConnectionResetError, BrokenPipeError):
                      pass
          if count == max_idling: break
  
  class ProxyRequestHandler(BaseHTTPRequestHandler):
      """RequestHandler with do_CONNECT method defined
      """
      server_version = "%s/%s" % (_name, __version__)
      # do_CONNECT() will set self.ssltunnel to override this
      ssltunnel = False
      # Override default value 'HTTP/1.0'
      protocol_version = 'HTTP/1.1'
  
      def do_CONNECT(self):
          "Descrypt https request and dispatch to http handler"
          # request line: CONNECT www.example.com:443 HTTP/1.1
          self.host, self.port = self.path.split(":")
          # SSL MITM
          self.wfile.write(("HTTP/1.1 200 Connection established\r\n" +
                            "Proxy-agent: %s\r\n" % self.version_string() +
                            "\r\n").encode('ascii'))
          commonname = '.' + self.host.partition('.')[-1] if self.host.count('.') >= 2 else self.host
          dummycert = get_cert(commonname)
          # set a flag for do_METHOD
          self.ssltunnel = True
  
          ssl_sock = ssl.wrap_socket(self.connection, keyfile=dummycert, certfile=dummycert, server_side=True)
          # Ref: Lib/socketserver.py#StreamRequestHandler.setup()
          self.connection = ssl_sock
          self.rfile = self.connection.makefile('rb', self.rbufsize)
          self.wfile = self.connection.makefile('wb', self.wbufsize)
          # dispatch to do_METHOD()
          self.handle_one_request()
  
      def handle_one_request(self):
          """Catch more exceptions than default
  
          Intend to catch exceptions on local side
          Exceptions on remote side should be handled in do_*()
          """
          try:
              BaseHTTPRequestHandler.handle_one_request(self)
              return
          except (ConnectionError, FileNotFoundError) as e:
              logger.warning(Fore.RED + "%s", e)
          except (ssl.SSLEOFError, ssl.SSLError) as e:
              if hasattr(self, 'url'):
                  # Happens after the tunnel is established
                  logger.warning(Fore.YELLOW + '"%s" while operating on established local SSL tunnel for [%s]' % (e, self.url))
              else:
                  logger.warning(Fore.YELLOW + '"%s" while trying to establish local SSL tunnel for [%s]' % (e, self.path))
          self.close_connection = 1
  
      def sendout_error(self, url, code, message=None, explain=None):
          "Modified from http.server.send_error() for customized display"
          try:
              shortmsg, longmsg = self.responses[code]
          except KeyError:
              shortmsg, longmsg = '???', '???'
          if message is None:
              message = shortmsg
          if explain is None:
              explain = longmsg
          content = (message_format %
                     {'code': code, 'message': message, 'explain': explain,
                      'url': url, 'now': datetime.today(), 'server': self.server_version})
          body = content.encode('UTF-8', 'replace')
          self.send_response_only(code, message)
          self.send_header("Content-Type", self.error_content_type)
          self.send_header('Content-Length', int(len(body)))
          self.end_headers()
          if self.command != 'HEAD' and code >= 200 and code not in (204, 304):
              self.wfile.write(body)
  
      def deny_request(self):
          self.send_response_only(403)
          self.send_header('Content-Length', 0)
          self.end_headers()
  
      def redirect(self, url):
          self.send_response_only(302)
          self.send_header('Content-Length', 0)
          self.send_header('Location', url)
          self.end_headers()
  
      def forward_to_https_proxy(self):
          "Forward https request to upstream https proxy"
          logger.debug('Using Proxy - %s' % self.proxy)
          proxy_host, proxy_port = self.proxy.split('//')[1].split(':')
          server_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
          try:
              server_conn.connect((proxy_host, int(proxy_port)))
              server_conn.send(('CONNECT %s HTTP/1.1\r\n\r\n' % self.path).encode('ascii'))
              server_conn.settimeout(0.1)
              datas = b''
              while True:
                  try:
                      data = server_conn.recv(4096)
                  except socket.timeout:
                      break
                  if data:
                      datas += data
                  else:
                      break
              server_conn.setblocking(True)
              if b'200' in datas and b'established' in datas.lower():
                  logger.info(Fore.CYAN + '[P] SSL Pass-Thru: https://%s/' % self.path)
                  self.wfile.write(("HTTP/1.1 200 Connection established\r\n" +
                                    "Proxy-agent: %s\r\n\r\n" % self.version_string()).encode('ascii'))
                  read_write(self.connection, server_conn)
              else:
                  logger.warning(Fore.YELLOW + 'Proxy %s failed.', self.proxy)
                  if datas:
                      logger.debug(datas)
                      self.wfile.write(datas)
          finally:
              # We don't maintain a connection reuse pool, so close the connection anyway
              server_conn.close()
  
      def forward_to_socks5_proxy(self):
          "Forward https request to upstream socks5 proxy"
          logger.warning(Fore.YELLOW + 'Socks5 proxy not implemented yet, please use https proxy')
  
      def tunnel_traffic(self):
          "Tunnel traffic to remote host:port"
          logger.info(Fore.CYAN + '[D] SSL Pass-Thru: https://%s/' % self.path)
          server_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
          try:
              server_conn.connect((self.host, int(self.port)))
              self.wfile.write(("HTTP/1.1 200 Connection established\r\n" +
                                "Proxy-agent: %s\r\n" % self.version_string() +
                                "\r\n").encode('ascii'))
              read_write(self.connection, server_conn)
          except TimeoutError:
              self.wfile.write(b"HTTP/1.1 504 Gateway Timeout\r\n\r\n")
              logger.warning(Fore.YELLOW + 'Timed Out: https://%s:%s/' % (self.host, self.port))
          except socket.gaierror as e:
              self.wfile.write(b"HTTP/1.1 503 Service Unavailable\r\n\r\n")
              logger.warning(Fore.YELLOW + '%s: https://%s:%s/' % (e, self.host, self.port))
          finally:
              # We don't maintain a connection reuse pool, so close the connection anyway
              server_conn.close()
  
      def ssl_get_response(self, conn):
          try:
              server_conn = ssl.wrap_socket(conn, cert_reqs=ssl.CERT_REQUIRED, ca_certs="cacert.pem", ssl_version=ssl.PROTOCOL_TLSv1)
              server_conn.sendall(('%s %s HTTP/1.1\r\n' % (self.command, self.path)).encode('ascii'))
              server_conn.sendall(self.headers.as_bytes())
              if self.postdata:
                  server_conn.sendall(self.postdata)
              while True:
                  data = server_conn.recv(4096)
                  if data:
                      self.wfile.write(data)
                  else: break
          except (ssl.SSLEOFError, ssl.SSLError) as e:
              logger.error(Fore.RED + Style.BRIGHT + "[SSLError]")
              self.send_error(417, message="Exception %s" % str(e.__class__), explain=str(e))
  
      def purge_headers(self, headers):
          "Remove hop-by-hop headers that shouldn't pass through a Proxy"
          for name in ["Connection", "Keep-Alive", "Upgrade",
                       "Proxy-Connection", "Proxy-Authenticate"]:
              del headers[name]
  
      def write_headers(self, headers):
          self.purge_headers(headers)
          for key, value in headers.items():
              self.send_header(key, value)
          self.end_headers()
          
      def stream_to_client(self, response):
          bufsize = 1024 * 64
          need_chunked = 'Transfer-Encoding' in response.headers
          written = 0
          while True:
              data = response.read(bufsize)
              if not data:
                  if need_chunked:
                      self.wfile.write(b'0\r\n\r\n')
                  break
              if need_chunked:
                  self.wfile.write(('%x\r\n' % len(data)).encode('ascii'))
              self.wfile.write(data)
              if need_chunked:
                  self.wfile.write(b'\r\n')
              written += len(data)
          return written
          
      def http_request_info(self):
          """Return HTTP request information in bytes
          """    
          context = ["CLIENT VALUES:",
                     "client_address = %s" % str(self.client_address),
                     "requestline = %s" % self.requestline,
                     "command = %s" % self.command,
                     "path = %s" % self.path,
                     "request_version = %s" % self.request_version,
                     "",
                     "SERVER VALUES:",
                     "server_version = %s" % self.server_version,
                     "sys_version = %s" % self.sys_version,
                     "protocol_version = %s" % self.protocol_version,
                     "",
                     "HEADER RECEIVED:"]
          for name, value in sorted(self.headers.items()):
              context.append("%s = %s" % (name, value.rstrip()))
  
          if self.command == "POST":
              context.append("\r\nPOST VALUES:")
              form = cgi.FieldStorage(fp=self.rfile,
                                      headers=self.headers,
                                      environ={'REQUEST_METHOD': 'POST'})
              for field in form.keys():
                  fielditem = form[field]
                  if fielditem.filename:
                      # The field contains an uploaded file
                      file_data = fielditem.file.read()
                      file_len = len(file_data)
                      context.append('Uploaded %s as "%s" (%d bytes)'
                                     % (field, fielditem.filename, file_len))
                  else:
                      # Regular form value
                      context.append("%s = %s" % (field, fielditem.value))
                                      
          return("\r\n".join(context).encode('ascii'))
  
  def demo():
      PORT = 8000
  
      class ProxyServer(ThreadingMixIn, HTTPServer):
          """Handle requests in a separate thread."""
          pass
  
      class RequestHandler(ProxyRequestHandler):
          "Displaying HTTP request information"
          server_version = "DemoProxy/0.1"
  
          def do_METHOD(self):
              "Universal method for GET, POST, HEAD, PUT and DELETE"
              message = self.http_request_info()
              self.send_response(200)
              # 'Content-Length' is important for HTTP/1.1
              self.send_header('Content-Length', len(message))
              self.end_headers()
              self.wfile.write(message)
  
          do_GET = do_POST = do_HEAD = do_PUT = do_DELETE = do_OPTIONS = do_METHOD
  
      print('%s serving now, <Ctrl-C> to stop ...' % RequestHandler.server_version)
      print('Listen Addr  : localhost:%s' % PORT)
      print("-" * 10)
      server = ProxyServer(('', PORT), RequestHandler)
      server.serve_forever()
  
  if __name__ == '__main__':
      try:
          demo()
      except KeyboardInterrupt:
          print("Quitting...")
  