webmention-widget.php

<?php
/**
 * Plugin Name: Webmention Widget
 * Description: Add recent webmentions’ status to WordPress’ dashboard.
 * Version:     0.1
 * Author:      Jan Boddez
 * Author URI:  https://jan.boddez.net/
 * License: GNU General Public License v2 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * @package Webmention_Widget
 */

class Webmention_Widget {
	/**
	 * Registers main hook.
	 */
	function __construct() {
		add_action( 'wp_dashboard_setup', array( $this, 'add_dashboard_widget' ) );
		add_action( 'webmention_post_send', array( $this, 'store_webmention_status' ), 10, 4 );
	}

	/**
	 * Defines the Pages Dashboard Widget.
	 */
	public function add_dashboard_widget() {
		wp_add_dashboard_widget(
			'webmention_dashboard_widget',                          // Widget slug.
			__( 'Recently Sent Webmentions', 'webmention-widget' ), // Title.
			array( $this, 'webmention_dashboard_widget' )           // Display function.
		);
	}

	/**
	 * Stores a sent webmention's status.
	 */
	public function store_webmention_status( $response, $source, $target, $post_id ) {
		$recent_webmentions = get_transient( 'recent_webmentions' );

		if ( empty( $recent_webmentions ) ) {
			$recent_webmentions = array();
		}

		$result = array(
			'target' => esc_url_raw( $target ),
			'code'   => wp_remote_retrieve_response_code( $response ) ?: 0,
		);

		if ( is_wp_error( $response ) ) {
			$result['error'] = $response->get_error_message() ?: '';
		}

		$recent_webmentions[] = $result;

		set_transient( 'recent_webmentions', array_slice( $recent_webmentions, 0, 10 ) ); // Keep only the 10 most recent statuses.
	}

	/**
	 * Outputs the actual Webmention dashboard widget.
	 */
	function webmention_dashboard_widget() {
		$recent_webmentions = get_transient( 'recent_webmentions' );

		if ( empty( $recent_webmentions ) ) {
			echo '<p>' . esc_html__( 'No recent webmentions found.', 'webmention-widget' ) . '</p>';
			return;
		}
		?>
		<table style="width: 100%; box-sizing: border-box;">
			<?php
			foreach ( $recent_webmentions as $result ) {
				?>
				<tr>
					<td><a href="<?php echo esc_url( $result['target'] ); ?>"><?php echo esc_html( wp_parse_url( $result['target'], PHP_URL_HOST ) ); ?></a></td>
					<td style="text-align: right;"><?php echo esc_html( $result['code'] ); ?></td>
				</tr>

				<?php if ( ! empty( $result['error'] ) ) : ?>
					<tr>
						<td colspan="2" style="color: rgb(170, 0, 0);"><?php echo esc_html( $result['error'] ); ?></td>
					</tr>
				<?php endif ?>
				<?php
			}
			?>
		</table>
		<?php
	}
}

new Webmention_Widget();