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