我找到了这个解决方案：

在我的Admin object

add_action( \'admin_notices\', array( $this, \'display_warning_no_ssl\') );

function display_warning_no_ssl() {

    $forms = foo_get_form_pages();

    foreach ( $forms as $form ){
        $permalink = get_post_permalink( $form[\'ID\'] );
        $protocol = foo_get_protocol( $permalink );
        if($protocol !== "https"){
            ?>
            <div class="notice error is-dismissible" >
                <p><?php _e( \'Enabling the HTTPS protocol for the page : "\'.$permalink.\'" is not mandatory but strongly advised for security issues for your users.!\', PLUGIN_DOMAIN ); ?></p>
            </div>
            <?php
        }
    }

} 

function foo_get_form_pages(){
    global $wpdb;
    $forms_query_string       = "SELECT * FROM {$wpdb->prefix}posts WHERE post_type=\'foo\'";
    $forms = $wpdb->get_results( $forms_query_string, ARRAY_A );
    $f_forms = array();
    foreach ( $forms as $key => $val ){
        $f_forms[$val[\'post_name\']] = $val; 
    }
    return $f_forms; 
}

function foo_get_protocol( $url ){
    $a_url = explode("://", $url);
    return $a_url[0];
}