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/**
* Cross site request forgery prevention:
* We send both a cookie and a query parameter with the same random token.
* The server should check that they are equal.
*
* NB: Makes use of JQuery ajaxPrefilter to automatically expose the mechanism
*/
/*global define */
define(['jquery', './mobile-bridge', 'module'], function ($, mobileBridge, module) {
'use strict';
var csrf = {},
token,
tokenName = encodeURIComponent('CSRF'),
firstOfQueue = null,
moduleInitialized = false;
/**
* Creates a random alphanumeric string of length 128
* @return {String}
*/
function generateRandomToken() {
if (mobileBridge.isMobile){
var mobileToken = getMobileToken();
if (mobileToken !== null){
// Sets the token in a cookie
setCookie(mobileToken);
return mobileToken;
}
}
var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz',
stringLength = 128,
randomString = '',
i;
for (i = 0; i < stringLength; i++) {
var rnum = Math.floor(Math.random() * chars.length);
randomString += chars.substring(rnum, rnum + 1);
}
// Sets the token in a cookie
setCookie(encodeURIComponent(randomString));
return encodeURIComponent(randomString);
}
/**
* Uses the mobile shell to generate a token. Returns null if
* not run from within the shell.
*/
function getMobileToken() {
return mobileBridge.isMobile && (typeof mobileBridge.getCSRFToken === 'function') ? mobileBridge.getCSRFToken() : null;
}
/**
* Saves a token as a csrf cookie with an expiry date
* @param {String} value alphanumeric token
*/
function setCookie(value, expires) {
window.document.cookie = tokenName + '=' + value + '; Path=/' +
(module.config().secure !== false ? '; Secure' : '') +
(expires !== undefined ? ';expires=Thu, 01 Jan 1970 00:00:00 UTC' : '')
;
}
/**
* Overrides default jQuery behaviour to add the csrf cookie
* and request parameter in the url automatically.
* For an explanation of the parameters, see the jQuery docs
*/
function setupAjaxPrefilter(){
$.ajaxPrefilter(function (options, originalOptions, jqXHR) {
// if first Ajax of queue, the token is not yet generated, so ajaxStart function
// will set the token when it will be available.
// if second consecutive request, then the ajaxStart will already be called,
// and the token would be already available, so set header right now.
if (firstOfQueue === null){
firstOfQueue = jqXHR;
}else{
jqXHR.setRequestHeader(tokenName, token);
}
});
}
function ajaxStart(){
// Gets a token. Gives precedence to the mobile token.
token = generateRandomToken();
// token should already be available at this time, while for the first Ajax,
// the prefilter will be call before "ajaxStart"
if (firstOfQueue !== null){
firstOfQueue.setRequestHeader(tokenName, token);
}
}
function ajaxStop(){
// clear the cookie
setCookie('' /* empty CSRF value */, true /* expires now*/);
token = null;
firstOfQueue = null;
}
/**
* Initialization function. Gets the token from either mobile or random
* Sets the cookie.
*/
function initialize() {
if (moduleInitialized){
return; // already initialized
}
// set the initialized
moduleInitialized = true;
$(document).ajaxStart(ajaxStart);
$(document).ajaxStop(ajaxStop);
setupAjaxPrefilter();
}
/**
* Automatically add token to a form
*/
csrf.addTokenOnSubmit = function(htmlElement) {
var form = $(htmlElement);
if (typeof form.prop('tagName') !== 'string' || 'FORM' !== form.prop('tagName').toUpperCase()) {
throw 'Cannot add token on other elements than a form';
}
if (typeof form.attr('method') === 'string' && form.attr('method').toLowerCase() === 'post') {
token = generateRandomToken();
var csrfHidden = $('<input>')
.attr('type', 'hidden')
.attr('name', tokenName)
.attr('value', token);
form.append(csrfHidden);
}
};
csrf.isAjaxRequestOngoing = function(){
return firstOfQueue !== null;
};
initialize();
return csrf;
});
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