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for a personal plugin (nothing going to the public or commercial), I built an AJAX form and its endpoint is a custom endpoint (REST Api).

When a certain Page containing my form is accessed, I generate a nonce.

Then, the user sends the form, I add the conventional header (X-WP-Nonce) and in the endpoint function I validate the nonce I first created when the page was loaded.

I would like my nonce to be short-lived, that is, 12 hours is too much.

I found I can use apply_filters('nonce_life', timeHere) but I don't know where this line is supposed to be: should it go right before this one?

$nonce = wp_create_nonce('wp_rest');

Moreover: could this line change the lifespan of ANY nonce in my WP or does the change affect only my nonce? I wouldn't want to break other plugins.

Thanks!

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Yes, using that filter will affect the lifespan of all nonces created after this filter is added, and while it remains in-place. So your best bet is to add it, create the nonce, remove it:

function my_nonce_lifetime() {
    return 600; // 10 minutes
}
add_filter( 'nonce_life', 'my_nonce_lifetime' );
$nonce = wp_create_nonce('wp_rest');
remove_filter( 'nonce_life', 'my_nonce_lifetime' );
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    Glad it helps! :) – Paul G. Sep 3 '17 at 20:45

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