var express = require('express');
var proxy = require('express-http-proxy')

var app = express();

app.all('*', function (req, res, next) {
 res.header("Access-Control-Allow-Origin", req.headers.origin);
 res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
 res.header("Access-Control-Allow-Credentials", "true");
 res.header("Content-Type", "application/json;charset=utf-8");
 if (req.method == 'OPTIONS') {
  res.header('Access-Control-Allow-Headers', req.headers['access-control-request-headers']);
  res.send(200); /*讓options請求快速返回*/
 }
 else {
  next();
 }
});

// 代碼轉(zhuǎn)發(fā)
app.use('/ProxySSO', proxy(req => {
 return req.headers.apiurl
}, {
 filter: function (req, res) {

  // 用戶名\系統(tǒng)標(biāo)識(shí)\用戶權(quán)限
  let { systemName, masterName, powers } = req.tokenDecode;
  const { originalUrl } = req;
  const url = originalUrl.replace('/ProxySSO', '').split('?')[0];

  /**
   * 接口權(quán)限檢查
   * @param {String} url 接口地址
   * @param {Object} powers rbac權(quán)限列表
   * @returns {boolean} 是否有權(quán)限
   */
  const checkPowers = (url, powers) => {
    //  do something
  }
  const hasPowers = checkPowers(url, powers);
   // 權(quán)限判斷
  return hasPowers;
 },
 proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
  // header增加masterName 具體按照自己的需求來
  // proxyReqOpts.headers['masterName'] = srcReq.tokenDecode.masterName;
  return proxyReqOpts;
 }
}));

module.exports = app;