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183 lines
3.3 KiB
JavaScript

5 years ago
/*!
* cookie-parser
* Copyright(c) 2014 TJ Holowaychuk
* Copyright(c) 2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
* @private
*/
var cookie = require('cookie')
var signature = require('cookie-signature')
/**
* Module exports.
* @public
*/
module.exports = cookieParser
module.exports.JSONCookie = JSONCookie
module.exports.JSONCookies = JSONCookies
module.exports.signedCookie = signedCookie
module.exports.signedCookies = signedCookies
/**
* Parse Cookie header and populate `req.cookies`
* with an object keyed by the cookie names.
*
* @param {string|array} [secret] A string (or array of strings) representing cookie signing secret(s).
* @param {Object} [options]
* @return {Function}
* @public
*/
function cookieParser (secret, options) {
var secrets = !secret || Array.isArray(secret)
? (secret || [])
: [secret]
return function cookieParser (req, res, next) {
if (req.cookies) {
return next()
}
var cookies = req.headers.cookie
req.secret = secrets[0]
req.cookies = Object.create(null)
req.signedCookies = Object.create(null)
// no cookies
if (!cookies) {
return next()
}
req.cookies = cookie.parse(cookies, options)
// parse signed cookies
if (secrets.length !== 0) {
req.signedCookies = signedCookies(req.cookies, secrets)
req.signedCookies = JSONCookies(req.signedCookies)
}
// parse JSON cookies
req.cookies = JSONCookies(req.cookies)
next()
}
}
/**
* Parse JSON cookie string.
*
* @param {String} str
* @return {Object} Parsed object or undefined if not json cookie
* @public
*/
function JSONCookie (str) {
if (typeof str !== 'string' || str.substr(0, 2) !== 'j:') {
return undefined
}
try {
return JSON.parse(str.slice(2))
} catch (err) {
return undefined
}
}
/**
* Parse JSON cookies.
*
* @param {Object} obj
* @return {Object}
* @public
*/
function JSONCookies (obj) {
var cookies = Object.keys(obj)
var key
var val
for (var i = 0; i < cookies.length; i++) {
key = cookies[i]
val = JSONCookie(obj[key])
if (val) {
obj[key] = val
}
}
return obj
}
/**
* Parse a signed cookie string, return the decoded value.
*
* @param {String} str signed cookie string
* @param {string|array} secret
* @return {String} decoded value
* @public
*/
function signedCookie (str, secret) {
if (typeof str !== 'string') {
return undefined
}
if (str.substr(0, 2) !== 's:') {
return str
}
var secrets = !secret || Array.isArray(secret)
? (secret || [])
: [secret]
for (var i = 0; i < secrets.length; i++) {
var val = signature.unsign(str.slice(2), secrets[i])
if (val !== false) {
return val
}
}
return false
}
/**
* Parse signed cookies, returning an object containing the decoded key/value
* pairs, while removing the signed key from obj.
*
* @param {Object} obj
* @param {string|array} secret
* @return {Object}
* @public
*/
function signedCookies (obj, secret) {
var cookies = Object.keys(obj)
var dec
var key
var ret = Object.create(null)
var val
for (var i = 0; i < cookies.length; i++) {
key = cookies[i]
val = obj[key]
dec = signedCookie(val, secret)
if (val !== dec) {
ret[key] = dec
delete obj[key]
}
}
return ret
}