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/*!
* express-session
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* Copyright(c) 2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict';
/**
* Module dependencies.
* @private
*/
var Store = require('./store')
var util = require('util')
/**
* Shim setImmediate for node.js < 0.10
* @private
*/
/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
? setImmediate
: function(fn){ process.nextTick(fn.bind.apply(fn, arguments)) }
/**
* Module exports.
*/
module.exports = MemoryStore
/**
* A session store in memory.
* @public
*/
function MemoryStore() {
Store.call(this)
this.sessions = Object.create(null)
}
/**
* Inherit from Store.
*/
util.inherits(MemoryStore, Store)
/**
* Get all active sessions.
*
* @param {function} callback
* @public
*/
MemoryStore.prototype.all = function all(callback) {
var sessionIds = Object.keys(this.sessions)
var sessions = Object.create(null)
for (var i = 0; i < sessionIds.length; i++) {
var sessionId = sessionIds[i]
var session = getSession.call(this, sessionId)
if (session) {
sessions[sessionId] = session;
}
}
callback && defer(callback, null, sessions)
}
/**
* Clear all sessions.
*
* @param {function} callback
* @public
*/
MemoryStore.prototype.clear = function clear(callback) {
this.sessions = Object.create(null)
callback && defer(callback)
}
/**
* Destroy the session associated with the given session ID.
*
* @param {string} sessionId
* @public
*/
MemoryStore.prototype.destroy = function destroy(sessionId, callback) {
delete this.sessions[sessionId]
callback && defer(callback)
}
/**
* Fetch session by the given session ID.
*
* @param {string} sessionId
* @param {function} callback
* @public
*/
MemoryStore.prototype.get = function get(sessionId, callback) {
defer(callback, null, getSession.call(this, sessionId))
}
/**
* Commit the given session associated with the given sessionId to the store.
*
* @param {string} sessionId
* @param {object} session
* @param {function} callback
* @public
*/
MemoryStore.prototype.set = function set(sessionId, session, callback) {
this.sessions[sessionId] = JSON.stringify(session)
callback && defer(callback)
}
/**
* Get number of active sessions.
*
* @param {function} callback
* @public
*/
MemoryStore.prototype.length = function length(callback) {
this.all(function (err, sessions) {
if (err) return callback(err)
callback(null, Object.keys(sessions).length)
})
}
/**
* Touch the given session object associated with the given session ID.
*
* @param {string} sessionId
* @param {object} session
* @param {function} callback
* @public
*/
MemoryStore.prototype.touch = function touch(sessionId, session, callback) {
var currentSession = getSession.call(this, sessionId)
if (currentSession) {
// update expiration
currentSession.cookie = session.cookie
this.sessions[sessionId] = JSON.stringify(currentSession)
}
callback && defer(callback)
}
/**
* Get session from the store.
* @private
*/
function getSession(sessionId) {
var sess = this.sessions[sessionId]
if (!sess) {
return
}
// parse
sess = JSON.parse(sess)
if (sess.cookie) {
var expires = typeof sess.cookie.expires === 'string'
? new Date(sess.cookie.expires)
: sess.cookie.expires
// destroy expired session
if (expires && expires <= Date.now()) {
delete this.sessions[sessionId]
return
}
}
return sess
}