import  socket, _thread, select,http.client, io

class MyHandler:
    def __init__(self, connection, address, timeout):
        self.client = connection
        self.timeout = timeout
        self.host=''
        self.port=80
        data=self.HttpRequestParser()
        self.remote = socket.create_connection((self.host, self.port))
        self.remote.sendall(data)
        self.Http_forward(self.client,self.remote)
        self.remote.close()
        self.client.close()
 
    #连接建立后转发数据
    def Http_forward(self,local, remote, timeout=60, ):
        count = 0
        while 1:
            count += 2
            (ins, _, errors) = select.select([ local,remote], [], [ local,remote], 2)
            if errors:
                break
            if ins:
                for sock in ins:
                    if sock is local:
                        remote.sendall(self.HttpRequestParser())
                    else:
                        local.sendall(sock.recv(8192))
                    count=0
            else:
                pass
            if count == timeout:
                break

#把来自客户端的请求重新封装下
    def HttpRequestParser(self):
    
        client_buffer = b''

        while 1:
            client_buffer += self.client.recv(8192)
            end = client_buffer.find(b'\n')
            if end!=-1:
                break

        end = client_buffer.find(b'\r\n')
        method, path, protocol = (client_buffer[:end+1]).split()
        client_buffer = client_buffer[end+2:]
        end=client_buffer.find(b'\r\n\r\n')
        postdata=client_buffer[end+4:]
        headers=dict(http.client.parse_headers(io.BytesIO(client_buffer[:end+4])))
        headers['Connection']='close'
        
        path = path[7:]
        i = path.find(b'/')
        self.host = path[:i] 
        path = path[i:]
        i = self.host.find(b':')
        if i!=-1:
            self.port = int(self.host[i+1:])
            self.host = self.host[:i]
        else:
            self.port = 80
        #重新构造http请求
        data=method+b' '+path+b' '+protocol+b'\r\n'
        data+=bytes(''.join('%s: %s\r\n' % (k, headers[k]) for k in headers if not  k.startswith('Proxy-')), encoding = "utf-8") #herders
        data+=postdata
        print(bytes.decode(data))
        return data

def start_server(host='localhost', port=8000, IPv6=False, timeout=60,
                  handler=MyHandler):
    if IPv6==True:
        soc_type=socket.AF_INET6
    else:
        soc_type=socket.AF_INET
    soc = socket.socket(soc_type)
    soc.bind((host, port))
    print ("Serving on %s:%d."%(host, port))#debug
    soc.listen(0)
    while 1:
        _thread.start_new_thread(handler, soc.accept()+(timeout,))

if __name__ == '__main__':
    start_server()

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