rewrite to a module

extra_modules/getip.js

@@ -1,15 +1,14 @@
-const fs = require('fs');
-const config = JSON.parse(fs.readFileSync("server_config.json"))
-
+import fs from "fs";
+const config = JSON.parse(fs.readFileSync("server_config.json"));
 /**
  * gets ip of a request
- * @param {request} req 
+ * @param {request} req
  * @returns ip of the given request, after taking preferred headers into account
  */
- function getIP(req) {
+function getIP(req) {
     let ip = req.socket.remoteAddress;
-    if(req.headers[config.preferred_ip_header] != undefined && ip == config.only_prefer_when_ip)ip = req.headers[config.preferred_ip_header]
-    return ip
-  }
-
-module.exports = getIP
+    if (req.headers[config.preferred_ip_header] != undefined && ip == config.only_prefer_when_ip)
+        ip = req.headers[config.preferred_ip_header];
+    return ip;
+}
+export default getIP;