Datei drafts-for-friends.php:

<?php
/*
  Plugin Name: Drafts for Friends
  Plugin URI: https://wp-plugin-erstellen.de
  Version: 0.1.0
  Author: Florian Simeth
  Author URI: https://florian-simeth.de
  Description: Allows to create links to draft posts.
  Text Domain: drafts-for-friends
  Domain Path: /languages
  License: GPL
 */

add_action( 'admin_menu', 'dff_menus' );

function dff_menus() {
	$hook = add_submenu_page(
		'edit.php',							# Eltern-Menü
		__( 'Drafts for Friends', 'drafts-for-friends' ),	# Seitentitel
		__( 'Drafts for Friends', 'drafts-for-friends' ),	# Menütitel
		'manage_options',						# Benutzerrecht
		'drafts-for-friends',						# Menü-Slug
		'dff_settings_page_render'				# Funktionsname
	);

	add_action( 'load-' . $hook, 'dff_new_draft_create' );
}

function dff_settings_page_render() {
	?>
    <div class="wrap">
        <h1><?php echo esc_html( get_admin_page_title() ); ?></h1>

		<?php
		include( plugin_dir_path( __FILE__ ) . '/templates/released-posts.php' );

		include( plugin_dir_path( __FILE__ ) . '/templates/new-draft-form.php' );
		?>

    </div>
	<?php
}

function dff_draft_select_options() {
	$query = new WP_Query( array(
		'post_type'   => 'post',
		'post_status' => 'draft',
		'meta_query'  => array(
			array(
				'key'     => 'dff_key',
				'compare' => 'NOT EXISTS',
			),
		),
	) );

	if ( $query->have_posts() ) {
		while ( $query->have_posts() ) {
			$query->the_post();
			printf(
				'<option value="%d">%s</option>',
				get_the_ID(),
				esc_attr( get_the_title() )
			);
		}
	} else {
		printf(
			'<option value="0">%s</option>',
			esc_attr__( 'No drafts found.', 'drafts-for-friends' )
		);
	}
}

function dff_new_draft_create() {

	if ( ! isset( $_POST['action'] ) ) {
		return;
	}

	$nonce_check = check_admin_referer( 'dff_new_draft' );

	if ( ! $nonce_check ) {
		add_action( 'admin_notices', function () {
			?>
            <div class="notice notice-error is-dismissible">
                <p><?php _e( 'Sorry, you cannot create a new draft.', 'drafts-for-friends' ); ?></p>
            </div>
			<?php
		} );

		return;
	}

	$post_id = absint( $_POST['post_id'] ?? 0 ); // works in PHP > 7.0 only

	if ( empty( $post_id ) ) {
		add_action( 'admin_notices', function () {
			?>
            <div class="notice notice-error is-dismissible">
                <p><?php _e( 'Please select a valid draft post from the select box.', 'drafts-for-friends' ); ?></p>
            </div>
			<?php
		} );

		return;
	}

	$is_saved = add_post_meta( $post_id, 'dff_key', uniqid() );

	if ( ! $is_saved ) {
		add_action( 'admin_notices', function () {
			?>
            <div class="notice notice-error is-dismissible">
                <p><?php _e( 'Sorry, draft could not be released.', 'drafts-for-friends' ); ?></p>
            </div>
			<?php
		} );

		return;
	}

	add_action( 'admin_notices', function () {
		?>
        <div class="notice notice-success is-dismissible">
            <p><?php _e( 'Draft has been released.', 'drafts-for-friends' ); ?></p>
        </div>
		<?php
	} );

}

add_filter( 'query_vars', 'dff_add_query_var' );

function dff_add_query_var( $vars ) {

	$vars[] = 'dff_key';

	return $vars;
}

add_action( 'pre_get_posts', 'dff_intersect' );

function dff_intersect( $wp_query ) {

	if ( ! $wp_query->is_main_query() ) {
		return;
	}

	if ( ! $wp_query->is_single ) {
		return;
	}

	$post_stati   = (array) get_query_var( 'post_status' );
	$post_stati[] = 'draft';
	$post_stati   = array_filter( $post_stati );
	set_query_var( 'post_status', $post_stati );

	$key = get_query_var( 'dff_key' );

	$meta_queries   = (array) get_query_var( 'meta_query' );
	$meta_queries[] = array(
		'key'     => 'dff_key',
		'value'   => esc_sql( $key ),
		'compare' => '=',
	);
	$meta_queries   = array_filter( $meta_queries );
	set_query_var( 'meta_query', $meta_queries );
}

add_action( 'publish_post', 'dff_delete_key_on_transition' );

function dff_delete_key_on_transition( $post_id ) {
	delete_post_meta( $post_id, 'dff_key' );
}

add_filter( 'wp_redirect', 'dff_redirect_remove_key' );

function dff_redirect_remove_key( $url ) {
	$key = get_query_var( 'dff_key' );

	if ( empty( $key ) ) {
		return $url;
	}

	$post_id = get_query_var( 'p' );

	if ( 'draft' != get_post_status( $post_id ) ) {
		$url = remove_query_arg( 'dff_key', $url );
	}

	return $url;
}

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