yos_web/buildAnnexation/BGJ/server.js

/**
 * 本地开发服务器，解决跨域问题
 *
 * 使用方法：node server.js
 * 启动后访问：http://localhost:3000/yuyue.html?test=1
 */
const http = require('http')
const fs = require('fs')
const path = require('path')
const url = require('url')

const PORT = 3003
const API_HOST = '61.164.207.46'
const API_PORT = 8000

const MIME = {
  '.html': 'text/html;charset=utf-8',
  '.js': 'application/javascript;charset=utf-8',
  '.css': 'text/css;charset=utf-8',
  '.json': 'application/json;charset=utf-8',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.gif': 'image/gif',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon'
}

// 静态文件服务
function serveStatic(req, res) {
  var pathname = url.parse(req.url).pathname
  if (pathname === '/') pathname = '/yuyue.html'

  var filePath = path.join(__dirname, pathname)
  var ext = path.extname(filePath)

  fs.readFile(filePath, function(err, data) {
    if (err) {
      res.writeHead(404, { 'Content-Type': 'text/plain' })
      res.end('Not Found')
      return
    }
    res.writeHead(200, {
      'Content-Type': MIME[ext] || 'application/octet-stream',
      // 允许页面被 iframe 嵌入
      'X-Frame-Options': 'SAMEORIGIN'
    })
    res.end(data)
  })
}

// 代理 API 请求
function proxyApi(req, res) {
  var chunks = []
  req.on('data', function(chunk) { chunks.push(chunk) })
  req.on('end', function() {
    var body = Buffer.concat(chunks)

    // 从请求的 Host 头中获取域名和端口号
    var host = req.headers.host || (API_HOST + ':' + API_PORT)
    var hostParts = host.split(':')
    var targetHost = hostParts[0]
    var targetPort = hostParts[1] || '80'

    var options = {
      hostname: targetHost,
      port: targetPort,
      path: '/yos/rest/index',
      method: 'POST',
      headers: {
        'Content-Type': 'application/json;charset=utf-8',
        'Content-Length': body.length
      }
    }

    var proxyReq = http.request(options, function(proxyRes) {
      var data = []
      proxyRes.on('data', function(chunk) { data.push(chunk) })
      proxyRes.on('end', function() {
        // 返回响应，添加 CORS 头
        res.writeHead(proxyRes.statusCode, {
          'Content-Type': 'application/json;charset=utf-8',
          'Access-Control-Allow-Origin': '*',
          'Access-Control-Allow-Methods': 'POST, OPTIONS',
          'Access-Control-Allow-Headers': 'Content-Type'
        })
        res.end(Buffer.concat(data))
      })
    })

    proxyReq.on('error', function(err) {
      res.writeHead(500, { 'Content-Type': 'application/json;charset=utf-8' })
      res.end(JSON.stringify({ code: -1, data: '代理请求失败: ' + err.message }))
    })

    proxyReq.write(body)
    proxyReq.end()
  })
}

var server = http.createServer(function(req, res) {
  var pathname = url.parse(req.url).pathname

  // 处理 OPTIONS 预检请求
  if (req.method === 'OPTIONS') {
    res.writeHead(204, {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'POST, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type',
      'Access-Control-Max-Age': 86400
    })
    res.end()
    return
  }

  // API 代理
  if (pathname === '/api/proxy') {
    proxyApi(req, res)
    return
  }

  // 静态文件
  serveStatic(req, res)
})

server.listen(PORT, '0.0.0.0', function() {
  console.log('========================================')
  console.log('  本地开发服务器已启动')
  console.log('  访问地址: http://localhost:' + PORT + '/yuyue.html')
  console.log('  测试模式: http://localhost:' + PORT + '/yuyue.html?test=1')
  console.log('  按 Ctrl+C 停止')
  console.log('========================================')
})