Server code cleanup & fixes.

common.js

@@ -14,6 +14,7 @@
 /*jshint esversion: 6 */
 "use strict";
 
+const fs = require("fs");
 const crypto = require("crypto");
 
 // Binary encoding and decoding functions
@@ -171,4 +172,4 @@ module.exports.checkPasswordRequirements = function(password, requirements) {
     if (requirements.upper && (upper < requirements.upper)) return false;
     if (requirements.nonalpha && (nonalpha < requirements.nonalpha)) return false;
     return true;
-}
+}