add script to initialize/reset admin password to default

db/reset_admin_password.js

@@ -0,0 +1,62 @@
+#!/usr/bin/env node
+const {getMysqlConnection} = require('../lib/db');
+const crypto = require('crypto');
+const uuidv4 = require('uuid/v4');
+const sqlInsert = `INSERT into users 
+(user_sid, name, hashed_password, salt) 
+values (?, ?, ?, ?)
+`;
+/**
+ * generates random string of characters i.e salt
+ * @function
+ * @param {number} length - Length of the random string.
+ */
+const genRandomString = (len) => {
+  return crypto.randomBytes(Math.ceil(len / 2))
+    .toString('hex') /** convert to hexadecimal format */
+    .slice(0, len);   /** return required number of characters */
+};
+
+/**
+ * hash password with sha512.
+ * @function
+ * @param {string} password - List of required fields.
+ * @param {string} salt - Data to be validated.
+ */
+const sha512 = function(password, salt) {
+  const hash = crypto.createHmac('sha512', salt); /** Hashing algorithm sha512 */
+  hash.update(password);
+  var value = hash.digest('hex');
+  return {
+    salt:salt,
+    passwordHash:value
+  };
+};
+
+const saltHashPassword = (userpassword) => {
+  var salt = genRandomString(16); /** Gives us salt of length 16 */
+  return sha512(userpassword, salt);
+};
+
+/* reset admin password */
+getMysqlConnection((err, conn) => {
+  if (err) return console.log(err, 'Error connecting to database');
+
+  /* delete admin user if it exists */
+  conn.query('DELETE from users where name = "admin"', (err) => {
+    if (err) return console.log(err, 'Error removing admin user');
+    const {salt, passwordHash} = saltHashPassword('admin');
+    const sid = uuidv4();
+    conn.query(sqlInsert, [
+      sid,
+      'admin',
+      passwordHash,
+      salt
+    ], (err) => {
+      if (err) return console.log(err, 'Error inserting admin user');
+      console.log('successfully reset admin password');
+      conn.release();
+      process.exit(0);
+    });
+  });
+});