Method handleHandshakeResponse

deps/undici/src/lib/core/socks5-client.js:182–209

* Handle handshake response from server

()

   * Handle handshake response from server
   */
  handleHandshakeResponse () {
    if (this.buffer.length < 2) {
      return // Not enough data yet
    }

    const version = this.buffer[0]
    const method = this.buffer[1]

    if (version !== SOCKS_VERSION) {
      throw new Socks5ProxyError(`Invalid SOCKS version: ${version}`, 'UND_ERR_SOCKS5_VERSION')
    }

    if (method === AUTH_METHODS.NO_ACCEPTABLE) {
      throw new Socks5ProxyError('No acceptable authentication method', 'UND_ERR_SOCKS5_AUTH_REJECTED')
    }

    this.buffer = this.buffer.subarray(2)
    debug('server selected auth method', method)

    if (method === AUTH_METHODS.NO_AUTH) {
      this.markAuthenticated()
    } else if (method === AUTH_METHODS.USERNAME_PASSWORD) {
      this.state = STATES.AUTHENTICATING
      this.sendAuthRequest()
    } else {
      throw new Socks5ProxyError(`Unsupported authentication method: ${method}`, 'UND_ERR_SOCKS5_AUTH_METHOD')
    }
  }

  /**
   * Send username/password authentication request