PHP: authenticate for a REST request?

Question

I did create some custom endpoints for a plugin i'm working on, with the REST api. It works quite well, but now I would like to secure those requests : I don't want external users (EDIT: I mean remote requests) to be able to do query them.

But I only find documentation about javascript authentification (REST API Handbook). How should I achieve authentification with PHP (WP 5.1.1 here) ?

Thanks

Answer 1

What do you mean by "external users"? If you only want Users, that are logged into your website, to use the API Endpoint, you can filter the "rest_authentication_errors" like described here

Add this to your plugin:

add_filter( 'rest_authentication_errors', function( $result ) {
    if ( ! empty( $result ) ) {
        return $result;
    }
    if ( ! is_user_logged_in() ) {
        return new WP_Error( 'rest_not_logged_in', 'You are not currently logged in.', array( 'status' => 401 ) );
    }
    return $result;
});

Happy Coding!