What is the best way to handle expired tokens in laravel 5.
I mean I have a page and it has some links which perform ajax requests. They work fine when the page is loaded but when I wait for sometime then I get a TOKEN MISMATCH error.
Now, I have to refresh the page to make it work again. BUT, I don't want to refresh the page. I want some way to refresh the token or some other work around to make it fix.
I hope you got my point.
I think the answer by @UX Labs is misleading. And then the comment from @jfadich seems completely incorrect.
For Laravel 5.4 in May 2017, I solved the problem this way:
In web.php:
Route::post('keep-token-alive', function() {
return 'Token must have been valid, and the session expiration has been extended.'; //https://stackoverflow.com/q/31449434/470749
});
In javascript in your view:
$(document).ready(function () {
setInterval(keepTokenAlive, 1000 * 60 * 15); // every 15 mins
function keepTokenAlive() {
$.ajax({
url: '/keep-token-alive', //https://stackoverflow.com/q/31449434/470749
method: 'post',
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
}).then(function (result) {
console.log(new Date() + ' ' + result + ' ' + $('meta[name="csrf-token"]').attr('content'));
});
}
});
Note that you must not list 'keep-token-alive' in the exclusions within VerifyCsrfToken.php. As @ITDesigns.eu implied in a comment, it's important for this route to verify that there is a valid token currently and that it just needs to have its expiration extended.
My Laravel site allows users to watch a video (an hour long), and it uses ajax to post their progress every minute.
But many users load the page and then don't start the video until many hours later.
I don't know why they leave their browser tab open so long before watching, but they do.
And then I'd get a ton of TokenMismatch exceptions in my logs (and would miss out on the data of their progress).
In session.php, I changed 'lifetime' from 120 to 360 minutes, but that still wasn't enough. And I didn't want to make it longer than 6 hours. So I needed to enable this one page to frequently extend the session via ajax.
In web.php:
Route::post('refresh-csrf', function() {//Note: as I mentioned in my answer, I think this approach from @UX Labs does not make sense, but I first wanted to design a test view that used buttons to ping different URLs to understand how tokens work. The "return csrf_token();" does not even seem to get used.
return csrf_token();
});
Route::post('test-csrf', function() {
return 'Token must have been valid.';
});
In javascript in your view:
<button id="tryPost">Try posting to db</button>
<button id="getNewToken">Get new token</button>
(function () {
var $ = require("jquery");
$(document).ready(function () {
$('body').prepend('<div>' + new Date() + ' Current token is: ' + $('meta[name="csrf-token"]').attr('content') + '</div>');
$('#getNewToken').click(function () {
$.ajax({
url: '/refresh-csrf',
method: 'post',
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
}).then(function (d) {
$('meta[name="csrf-token"]').attr('content', d);
$('body').prepend('<div>' + new Date() + ' Refreshed token is: ' + $('meta[name="csrf-token"]').attr('content') + '</div>');
});
});
$('#tryPost').click(function () {
$.ajax({
url: '/test-csrf',
method: 'post',
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
}).then(function (d) {
$('body').prepend('<div>' + new Date() + ' Result of test: ' + d + '</div>');
});
});
});
})();
In session.php, temporarily change 'lifetime' to something very short for testing purposes.
Then play around.
This is how I learned how the Laravel token works and how we really just need to successfully POST to a CSRF-protected route frequently so that the token continues to be valid.
Update 2022; the csrf_token() method will never create a new token, and it simply loads existing CSRF-token from current-session (if any, and returns it).
But this tricks you into thinking it works, because Laravel increases the life-time of the existing CSRF-token, and that each time a request to a CSRF-protected route is made.
For an implemention that really creates new CSRF-token, see:
stackoverflow.com/Get new CSRF token with Ajax?
A work around for it, is to actually get the new token every certain time, otherwise you are defeating the purpose of the csrf token:
<html>
<head>
<meta name="csrf_token" content="{{ csrf_token() }}">
</head>
<body>
<script type="text/javascript">
var csrfToken = $('[name="csrf_token"]').attr('content');
setInterval(refreshToken, 3600000); // 1 hour
function refreshToken(){
$.get('refresh-csrf').done(function(data){
csrfToken = data; // the new token
});
}
setInterval(refreshToken, 3600000); // 1 hour
</script>
</body>
</html>
In laravel routes
Route::get('refresh-csrf', function(){
return csrf_token();
});
I apologize in case of any syntax errors, haven't used jquery for long time, but i guess you get the idea
I combine 2 things for this case:
1. Increase session lifetime
//In config/session.php replace this:
'lifetime' => 120
//with:
'lifetime' => 360
Laravel 5 default lifetime is 120 (minutes), you can change it to whatever value you like, for example 360 (6 hours)
2. Catch the exception and display an error message
//In app/Exceptions/Handler.php replace this:
public function render($request, Exception $e)
{
if ($e instanceof ModelNotFoundException) {
$e = new NotFoundHttpException($e->getMessage(), $e);
}
return parent::render($request, $e);
}
//with:
public function render($request, Exception $e)
{
if ($e instanceof ModelNotFoundException) {
$e = new NotFoundHttpException($e->getMessage(), $e);
}
if ($e instanceof \Illuminate\Session\TokenMismatchException) {
return redirect('/')->withErrors(['token_error' => 'Sorry, your session seems to have expired. Please try again.']);
}
return parent::render($request, $e);
}
So basicaly you redirect the user to the root "/" (you can change this to any path you want) with an error message and on that page you have to do this to display the error message:
@if ($errors->has('token_error'))
{{ $errors->first('token_error') }}
@endif
According to the docs:
Laravel automatically generates a CSRF "token" for each active user session managed by the application.
This means, for any individual the csrf code is the same for any page that the user visits. It becomes invalid once your session expires. Thus if you set the lifetime to 1 week, CSRF token will only expire after 1 week.
This can achieved like this in config/session.php:
/*
|--------------------------------------------------------------------------
| Session Lifetime
|--------------------------------------------------------------------------
|
| Here you may specify the number of minutes that you wish the session
| to be allowed to remain idle before it expires. If you want them
| to immediately expire on the browser closing, set that option.
|
*/
'lifetime' => 60 * 24 * 7, // Set session lifetime to 1 week
'expire_on_close' => true,
Why I dont like any of the above answers:
Keeps the session forever alive and recreates a new CSRF token after a fixed time. This is an issue if the user has multiple taps open. Everytime one tap refreshes the CSRF token, all the other tabs become invalid.
This answer is better, because it does not change the CSRF token, so multiple tabs are not effected. It simply keeps the session alive with making a js call after a fixed time with setInterval. However, setInterval does not work while the PC goes to sleep. So the session may expire when the PC goes to sleep, which is also a likly scenario. Therefore, instead of trying to keep the session alive by js-calls,just increase lifetime.
Displaying an error when session is timed out is okay, but it would be better if the issue never happens. Setting lifetime to 6h is not enough, because its likly that a tab may be open for a couple of days.
All the other answers propose to disable CSRF for the route in questions, but this is of course no option, because it creates a big security risk.
Best way to handle this Exception is with App\Exceptions\Handler.php.
public function render($request, Exception $e) {
if ($e instanceof \Illuminate\Session\TokenMismatchException) {
return Redirect::back()->withErrors(['session' => 'Désolé, votre session semble avoir expiré. Veuillez réessayer.']);
}
return parent::render($request, $e);
}
and where ever you wanna show this message (in all your pages that contains csrf_token), add this piece:
<div>
@if(count($errors)>0)
@foreach($errors->all() as $error)
<ul>
<li>{{$error}}</li>
</ul>
@endforeach
@endif
</div>
Increase the lifetime of your sessions. You can do so by editing the config/session.php file in your laravel configuration.
/*
|--------------------------------------------------------------------------
| Session Lifetime
|--------------------------------------------------------------------------
|
| Here you may specify the number of minutes that you wish the session
| to be allowed to remain idle before it expires. If you want them
| to immediately expire on the browser closing, set that option.
|
*/
'lifetime' => 120,
I have a simple solution that:
in /routes/web.php:
$router->get('csrf-token', function() {
return request()->session()->token();
});
This simply returns the current csrf token.
Because this only returns a new token when necessary, there are no problems when having multiple tabs open as described by @Adam.
You just need to make sure to call the above route every X minutes (where X is your session lifetime - 5 minutes), and update any _token inputs. I do this as follows (i use momentjs and axios here):
handleNewCsrfToken();
// Use visbility API to make sure the token gets updated in time, even when the device went to sleep.
document.addEventListener('visibilitychange', function() {
if (document.visibilityState === 'visible') {
setTimeoutToRefreshCsrfToken();
} else if (document.visibilityState === 'hidden') {
clearTimeout(refreshCsrfTokenTimeout);
}
});
function handleNewCsrfToken() {
updateCsrfTokenTimeoutTarget();
setTimeoutToRefreshCsrfToken();
}
function updateCsrfTokenTimeoutTarget() {
csrfTokenTimeoutTarget = moment().add(2, 'hour').subtract(5, 'minute');
}
function setTimeoutToRefreshCsrfToken() {
refreshCsrfTokenTimeout = setTimeout(refreshCsrfToken, csrfTokenTimeoutTarget.diff());
}
function refreshCsrfToken() {
axios.get('/csrf-token').then(function(response) {
document.getElementsByName('_token').forEach(function(element) {
element.value = response.data;
handleNewCsrfToken();
});
});
}
try this in your main layout file
@guest
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<meta http-equiv="refresh" content="{{config('session.lifetime') * 60}}">
@endguest
a short and fast way.... for handling ajax requests,when token expire : add this script to the end of master layout or your document
$(window).load(function(){
$.ajaxSetup({
statusCode: {
419: function(){
location.reload();
}
}
});
});
and for handling http requests when token expires, create 419.blade.php in this path: \resources\views\errors and add this script to it:
<script type="text/javascript">
//reload on current page
window.location = '';
</script>
Circum-navigating the token is generally accepted as a terrible approach but there are problems with using js timers mentioned above too. js seetTimeout/setInterval is unreliable when the browser tab is either not it focus, minimised or in the case of many users, thier laptop/device is sleeping/closed etc.
A better route might be to use a js timer to recalculate the 'time to die' from a datestamp set in a cookie (or meta tag for fussy GDPR no-cookie users). this datestamp will be the realworld (timezoned) time the session will die and is updated every page refresh. This way, it doesn't matter what the browser/device was doing/not doing whilst you were away AND it'll still be acurate for those with 'keep me signed in' etc.
The next problem is what to do instead of auto resfreshing the token - present the user with a 're-login in' form (modal/popup) that ajaxes the new token to the page as mentioned above.
You may try Caffeine for Laravel package it set an interval then it refresh the token like suggested in some answers also it will be added automatically in every form having csrf token
I think the best option is to take the lifetime configuration of the config/session.php file, then the lifetime value multiplied by 60 * 1000 in the javascript code. Use helper function config() provided by laravel, it might look like this:
<script type="text/javascript">
var timeout = ({{config('session.lifetime')}} * 60) * 1000;
setTimeout(function() {
//reload on current page
window.location = '';
}, timeout);
</script>
This are all workarounds that I dont like.. (but I admit they can work) I dont know since witch version this exists on Laravel, but there is a way to exclude pages from CSRF token validation:
https://laravel.com/docs/5.5/csrf
Simply adding a record on $except array on VerifyCsrfToken Middleware with your uri that you want to exclude. Please take in account, this must only be done on specific cases.
This is the best solution for me... Simple and just like (almost) everything on Laravel, they already thought about it. ;)
