Sample template-part for Electric Book WP restricted pages

singular-restricted.php

<?php
/**
 * The template for displaying single posts and pages,
 * adapted as an Electric Book WP page for the Twenty Twenty theme
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
 *
 * @package WordPress
 * @subpackage Twenty_Twenty
 * @since Twenty Twenty 1.0
 */

get_header();
?>

<main id="site-content" role="main">

    <article <?php post_class(); ?> id="post-<?php the_ID(); ?>">

        <?php

        get_template_part( 'template-parts/entry-header' );

        if ( ! is_search() ) {
            get_template_part( 'template-parts/featured-image' );
        }

        ?>

        <div class="post-inner thin">

            <div class="entry-content">

                <?php

                // -------------------------------------------------------------------------
                // This is the part that does the work for Electric Book WP restricted pages
                // -------------------------------------------------------------------------

                    // check once-off token to prevent XSS and CSRF hacks
                    $redirect_token = isset($_GET['_wpnonce']) ? wp_verify_nonce($_GET['_wpnonce'], 'electric_book_wp_redirect') : false;
                    if ($redirect_token && isset($_GET['redirect_to'])) {

                        if (isset($_GET['reason']) && $_GET['reason'] === 'logged-out') { ?>

                            <p>
                                This is a restricted page. Please <a href="/wp-login.php?redirect_to=<?=urlencode($_GET['redirect_to'])?>">login to view it</a>.
                            </p>

                        <?php } elseif ($_GET['reason'] === 'role') { ?>

                            <p>
                                This is a restricted page. Although you are logged in, your profile lacks the necessary role required to view this page.
                            </p>

                        <?php }

                    } else {
                        echo 'I\'m just a normal WordPress page';
                    }

                // -------------------------------------------------------------------------

                ?>


            </div><!-- .entry-content -->

        </div><!-- .post-inner -->

        <div class="section-inner">
            <?php
            wp_link_pages(
                array(
                    'before'      => '<nav class="post-nav-links bg-light-background" aria-label="' . esc_attr__( 'Page', 'twentytwenty' ) . '"><span class="label">' . __( 'Pages:', 'twentytwenty' ) . '</span>',
                    'after'       => '</nav>',
                    'link_before' => '<span class="page-number">',
                    'link_after'  => '</span>',
                )
            );

            edit_post_link();

            // Single bottom post meta.
            twentytwenty_the_post_meta( get_the_ID(), 'single-bottom' );

            if ( is_single() ) {

                get_template_part( 'template-parts/entry-author-bio' );

            }
            ?>

        </div><!-- .section-inner -->

        <?php

        if ( is_single() ) {

            get_template_part( 'template-parts/navigation' );

        }

        /**
         *  Output comments wrapper if it's a post, or if comments are open,
         * or if there's a comment number – and check for password.
         * */
        if ( ( is_single() || is_page() ) && ( comments_open() || get_comments_number() ) && ! post_password_required() ) {
            ?>

            <div class="comments-wrapper section-inner">

                <?php comments_template(); ?>

            </div><!-- .comments-wrapper -->

            <?php
        }
        ?>

    </article><!-- .post -->

</main><!-- #site-content -->

<?php get_template_part( 'template-parts/footer-menus-widgets' ); ?>

<?php get_footer(); ?>

template-restricted-page-redirect.php

<?php
/**
 * Template Name: Template for Electric Book WP restricted pages
 * Template Post Type: post, page
 *
 * @package WordPress
 * @subpackage Twenty_Twenty
 * @since Twenty Twenty 1.0
 */

get_template_part( 'singular-restricted' );