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/*!
* csrf
* Copyright(c) 2014 Jonathan Ong
* Copyright(c) 2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var rndm = require('rndm')
var uid = require('uid-safe')
var compare = require('tsscmp')
var crypto = require('crypto')
var escape = require('base64-url').escape
/**
* Module exports.
* @public
*/
module.exports = Tokens
/**
* Token generation/verification class.
*
* @param {object} [options]
* @param {number} [options.saltLength=8] The string length of the salt
* @param {number} [options.secretLength=18] The byte length of the secret key
* @public
*/
function Tokens (options) {
if (!(this instanceof Tokens)) {
return new Tokens(options)
}
var opts = options || {}
var saltLength = opts.saltLength !== undefined
? opts.saltLength
: 8
if (typeof saltLength !== 'number' || !isFinite(saltLength) || saltLength < 1) {
throw new TypeError('option saltLength must be finite number > 1')
}
var secretLength = opts.secretLength !== undefined
? opts.secretLength
: 18
if (typeof secretLength !== 'number' || !isFinite(secretLength) || secretLength < 1) {
throw new TypeError('option secretLength must be finite number > 1')
}
this.saltLength = saltLength
this.secretLength = secretLength
}
/**
* Create a new CSRF token.
*
* @param {string} secret The secret for the token.
* @public
*/
Tokens.prototype.create = function create (secret) {
if (!secret || typeof secret !== 'string') {
throw new TypeError('argument secret is required')
}
return this._tokenize(secret, rndm(this.saltLength))
}
/**
* Create a new secret key.
*
* @param {function} [callback]
* @public
*/
Tokens.prototype.secret = function secret (callback) {
return uid(this.secretLength, callback)
}
/**
* Create a new secret key synchronously.
* @public
*/
Tokens.prototype.secretSync = function secretSync () {
return uid.sync(this.secretLength)
}
/**
* Tokenize a secret and salt.
* @private
*/
Tokens.prototype._tokenize = function tokenize (secret, salt) {
var hash = crypto
.createHash('sha1')
.update(salt + '-' + secret, 'ascii')
.digest('base64')
return escape(salt + '-' + hash)
}
/**
* Verify if a given token is valid for a given secret.
*
* @param {string} secret
* @param {string} token
* @public
*/
Tokens.prototype.verify = function verify (secret, token) {
if (!secret || typeof secret !== 'string') {
return false
}
if (!token || typeof token !== 'string') {
return false
}
var index = token.indexOf('-')
if (index === -1) {
return false
}
var salt = token.substr(0, index)
var expected = this._tokenize(secret, salt)
return compare(token, expected)
}
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