add user db model

nodejs/models/users.js

@@ -0,0 +1,58 @@
+var mysql   = require('mysql');
+var config  = require('../config');
+var crypto  = require('crypto');
+var jwt = require('jsonwebtoken');
+
+var connection = mysql.createConnection({
+  host:     config.mysql_host,
+  user:     config.mysql_user,
+  password: config.mysql_secret,
+  database: config.mysql_database
+});
+ 
+connection.connect();
+
+var Users = function () {
+  connection.query('CREATE TABLE IF NOT EXISTS users ( id INT(12) NOT NULL AUTO_INCREMENT, name VARCHAR(200) NOT NULL,  salt VARCHAR(32) NOT NULL, hash VARCHAR(128) NOT NULL, UNIQUE (name),  PRIMARY KEY (id) )'
+  , function(err, rows, fields) {  
+    if (err) throw err;
+  });
+}
+
+Users.prototype.findById = function(id, callback) {
+  connection.query('SELECT * FROM users WHERE id = ?', [id], callback);
+}
+
+Users.prototype.findByName = function(name, callback) {
+  connection.query('SELECT * FROM users WHERE name = ?', [name.toLowerCase()], callback);
+}
+
+Users.prototype.validPassword = function (password, result) {
+  return result.hash === crypto.pbkdf2Sync(password, result.salt, 1000, 64).toString('hex');
+};
+
+Users.prototype.add = function(name, password, callback) {
+  var u = {
+    name: name.toLowerCase()
+  };
+
+  u.salt = crypto.randomBytes(16).toString('hex');
+  u.hash = crypto.pbkdf2Sync(password, u.salt, 1000, 64).toString('hex');
+  connection.query('INSERT INTO users SET ?', u, callback);
+}
+
+Users.prototype.generateJWT = function (id, username) {
+  
+  var today = new Date();
+  var exp = new Date(today);
+  exp.setDate(today.getDate() + 60);
+  
+  return jwt.sign({
+    _id: id,
+    username: username,
+    exp: parseInt(exp.getTime() / 1000),
+  }, config.crypto_secret);
+ 
+};
+
+module.exports = Users;