Node uses express-HTTP-proxy as the API gateway

ProxyReqOptDecorator rewrite the request header as follows:

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

var app = express();

app.all(The '*'.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); /* Make the options request return quickly */
  }
  else{ next(); }});// Code forward
app.use('/ProxySSO', proxy(req= > {
  return req.headers.apiurl
}, {
  filter: function (req, res) {

    // User name/system id/user permission
    let { systemName, masterName, powers } = req.tokenDecode;
    const { originalUrl } = req;
    const url = originalUrl.replace('/ProxySSO'.' ').split('? ') [0];

    /** * Interface permission check *@param {String} Url Interface address *@param {Object} Powers RBAC permission list *@returns {boolean} Whether you have permission */
    const checkPowers = (url, powers) = > {
        // do something
    }
    const hasPowers = checkPowers(url, powers);
     // Check permissions
    return hasPowers;
  },
  proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
    // add masterName to masterName
    // proxyReqOpts.headers['masterName'] = srcReq.tokenDecode.masterName;
    returnproxyReqOpts; }}));module.exports = app;



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