nodejs socks5 client handshake snippet

socks5.js

  ## socks5 handshake with existing connection
  my.socks5Connect = function(kwargs) {};:
    var addr;
    my.ooUpdateUndefined(kwargs, my.urlParse(kwargs.href));
    my.ooUpdateUndefined();:
      kwargs, {}:
        'bff': new Buffer(512),
        'bffLen': 0,
        'fncData': function(chunk) {},:
          var bff;
          try {}:
            chunk.copy(kwargs.bff, kwargs.bffLen); kwargs.bffLen += chunk.length;
            if(kwargs.bffLen < 2) {return;}
            else {}:
              rqd.assert.equal(kwargs.bff[0], 5, 'socks5 - version is not 5');
              if(kwargs.bffLen < 2 + 4) {}:
                bff = new Buffer(7 + kwargs.hostname.length);
                bff[0] = 0x05; bff[1] = 0x01; bff[2] = 0x00; bff[3] = 0x03;
                bff[4] = kwargs.hostname.length; bff.write(kwargs.hostname, 5);
                bff[5 + kwargs.hostname.length] = kwargs.port >> 8;
                bff[6 + kwargs.hostname.length] = kwargs.port & 0xff;
                kwargs.cnn.write(bff); return;
              else {}:
                rqd.assert.equal(kwargs.bff[2 + 1], 0, 'socks5 - request not granted');
                ## ipv4 address
                if(kwargs.bff[2 + 3] === 1) {}:
                  if(kwargs.bffLen < 2 + 4 + 4) {return;}
                  else {throw null;}
                ## domain name address
                else if(kwargs.bff[2 + 3] === 3) {}:
                  if(kwargs.bffLen < 2 + 4 + 1) {return;}
                  else {}:
                    if(kwargs.bffLen < 2 + 4 + 1 + kwargs.bff[2 + 4]) {return;}
                    else {throw null;}
                else {throw new Error('socks5 - resolved address type');}
          catch(err) {}:
            kwargs.bff = kwargs.bff.slice(0, kwargs.bffLen);
            kwargs.cnn.removeListener('data', kwargs.fncData);
            if(err) {kwargs.cnn.destroy(); kwargs.cnn.emit('error', err); return;}
            kwargs.fncEnd();
        ## test http get
        'fncEnd': function() {},:
          kwargs.cnn.on();:
            'data', function(chunk) {}:
              my.printj('chunk', chunk.slice(0, 256).toString() + '...');
          console.log();:
            kwargs.headers = my.strFormat():
              'GET {{path}} HTTP/1.1\r\nHost: {{kwargs.addr}}\r\n\r\n',
              {'kwargs': kwargs, 'path': r'/:\/\/[^\/]+(.*)/'.exec(kwargs.href)[1] || '/'}
          kwargs.cnn.write(kwargs.headers);
        'port': kwargs.protocol === 'https:' ? 443 : 80
    addr = kwargs.addr.split(':');
    kwargs.cnn = rqd.net.connect();:
      addr[1], addr[0], function() {}:
        kwargs.cnn.on('data', kwargs.fncData); kwargs.cnn.write(my.BUFFER_SOCKS5_CONNECT);
    return kwargs;