react express实现webssh demo解析

const SSHClient = require('ssh2').Client;
const utf8 = require('utf8');
export const createNewServer = (machineConfig: any, socket: any) => {
  const ssh = new SSHClient();
  const { host, username, password } = machineConfig;
  // 连接成功
  ssh.on('ready', function () {
    socket.send('\r\n*** SSH CONNECTION SUCCESS ***\r\n');
    ssh.shell(function (err: any, stream: any) {
      // 出错
      if (err) {
        return socket.send('\r\n*** SSH SHELL ERROR: ' + err.message + ' ***\r\n');
      }
      // 前端发送消息
      socket.on('message', function (data: any) {
        stream.write(data);
      });
      // 通过sh发送消息给前端
      stream.on('data', function (d: any) {
        socket.send(utf8.decode(d.toString('binary')));
        // 关闭连接
      }).on('close', function () {
        ssh.end();
      });
    })
    // 关闭连接
  }).on('close', function () {
    socket.send('\r\n*** SSH CONNECTION CLOSED ***\r\n');
    // 连接错误
  }).on('error', function (err: any) {
    socket.send('\r\n*** SSH CONNECTION ERROR: ' + err.message + ' ***\r\n');
    // 连接
  }).connect({
    port: 22,
    host,
    username,
    password
  });
}

import React, { useEffect, useRef } from 'react';
import { Terminal } from 'xterm';
import { WebLinksAddon } from 'xterm-addon-web-links';
import { FitAddon } from 'xterm-addon-fit';
import 'xterm/css/xterm.css';
const FontSize = 14;
const Col = 80;
const WebTerminal = () => {
  const webTerminal = useRef(null);
  const ws = useRef(null);
  useEffect(() => {
    // 初始化终端
    const ele = document.getElementById('terminal');
    if (ele && !webTerminal.current) {
      const height = ele.clientHeight;
      // 初始化
      const terminal = new Terminal({
        cursorBlink: true,
        cols: Col,
        rows: Math.ceil(height / FontSize),
      });
      // 辅助
      const fitAddon = new FitAddon();
      terminal.loadAddon(new WebLinksAddon());
      terminal.loadAddon(fitAddon);
      terminal.open(ele);
      terminal.write('Hello from \x1B[1;3;31mxterm.js\x1B[0m $ ');
      fitAddon.fit();
      webTerminal.current = terminal;
    }
    // 初始化ws连接
    if (ws.current) ws.current.close();
    const socket = new WebSocket('ws://localhost:3001');
    socket.onopen = () => {
      socket.send('connect success');
    };
    ws.current = socket;
  }, []);
  useEffect(() => {
    // 新增监听事件
    const terminal = webTerminal.current;
    const socket = ws.current;
    if (terminal && socket) {
      // 监听
      terminal.onKey(e => {
        const { key } = e;
        socket.send(key);
      });
      // ws监听
      socket.onmessage = e => {
        console.log(e);
        if (typeof e.data === 'string') {
          terminal.write(e.data);
        } else {
          console.error('格式错误');
        }
      };
    }
  }, []);
  return <div id="terminal"  style={{ backgroundColor: '#000', width: '100vw', height: '100vh' }}/>;
};
export default WebTerminal;

import WebSSH from './components/WebSSH';
import React from 'react';
import ReactDOM from 'react-dom';
ReactDOM.render(
  <WebSSH />,
  document.getElementById('root')
);