facebook-open-graph-update.php

<?php

/**
 * Plugin Name: Facebook Open Graph update
 * Plugin URI: https://wordpress.org/plugins/facebook-open-graph-update/
 * Description: Updates Facebook Open Graph when saving/updating a post
 * Version: 1.7.0
 * Author: Toni Viemerö
 * Author URI: https://selfdestruct.net/
 * License: GPLv3
 */

class FacebookOpenGraphUpdate {
	private $api_url = 'https://graph.facebook.com/';

	public function __construct() {
		add_action( 'transition_post_status', array( $this, 'transition_post_status' ), 10, 3 );
		add_action( 'save_post', array( $this, 'save_post' ), 10, 3 );
		add_action( 'publish_post', array( $this, 'publish_post' ), 10, 2 );
		add_action( 'admin_footer', array( $this, 'admin_footer' ) );
		add_filter( 'page_row_actions', array( $this, 'edit_row_actions' ), 10, 2 );
		add_filter( 'post_row_actions', array( $this, 'edit_row_actions' ), 10, 2 );
		add_action( 'wp_ajax_facebook_open_graph_update', array( $this, 'ajax' ) );
	}

	public function transition_post_status( $new_status, $old_status, $post ) {
		if ( 'publish' === $new_status && 'nav_menu_item' !== $post->post_type ) {
			$this->scrape( $post->ID );
		}
	}

	public function save_post( $post_id, $post, $update ) {
		if ( 'publish' === $post->post_status && 'nav_menu_item' !== $post->post_type ) {
			$this->scrape( $post->ID );
		}
	}

	public function publish_post( $post_id, $post ) {
		if ( 'nav_menu_item' !== $post->post_type ) {
			$this->scrape( $post->ID );
		}
	}

	public function admin_footer() {
		$screen = get_current_screen();

		if ( in_array( $screen->id, array( 'edit-page', 'edit-post' ), true ) ) {
			?>
			<script type="text/javascript">
			jQuery( document ).ready( function( $ ) {
				$( 'span.facebook_open_graph_update a' ).on( 'click', function( e ) {
					e.preventDefault();

					var data = {
						'action'  : 'facebook_open_graph_update',
						'post_id' : $( this ).data( 'post-id' ),
						'nonce'   : '<?php print esc_attr( wp_create_nonce( 'facebook-open-graph-update' ) ); ?>'
					};

					$.post( ajaxurl, data );
				} );
			} );
			</script>
			<?php
		}
	}

	public function edit_row_actions( $actions, $post ) {
		if ( current_user_can( 'edit_post', $post->ID ) ) {
			$actions = array_merge( $actions, array(
				'facebook_open_graph_update' => sprintf(
					'<a data-post-id="%d">' .
					__( 'Facebook Open Graph update', 'facebook-open-graph-update' ) .
					'</a>',
					$post->ID
				),
				)
			);
		}

		return $actions;
	}

	public function ajax() {
		global $wp_query;

		$status = false;

		if ( check_ajax_referer( 'facebook-open-graph-update', 'nonce' ) ) {
			if ( isset( $wp_query->query_vars['post_id'] ) && intval( $wp_query->query_vars['post_id'] ) > 0 ) {
				if ( $this->scrape( intval( $wp_query->query_vars['post_id'] ) ) ) {
					$status = true;
				}
			}
		}

		if ( $status ) {
			wp_send_json_success();
		} else {
			wp_send_json_error();
		}
	}

	public function scrape( $post_id = null ) {
		if ( boolval( get_option( 'blog_public' ) ) === false ) {
			return;
		}

		if ( intval( $post_id ) > 0 ) {
			$params = http_build_query( array(
				'id'           => esc_url( get_permalink( $post_id ) ),
				'scrape'       => true,
				'access_token' => $this->get_access_token(),
			) );

			$response = wp_remote_post( $this->api_url . '?' . $params );

			if ( is_wp_error( $response ) ) {
				return false;
			} else {
				$body = wp_remote_retrieve_body( $response );
				$json = json_decode( $body );
				if ( $json && isset( $json->id ) ) {
					return true;
				} else {
					return false;
				}
			}
		} else {
			return false;
		}
	}

	public function get_access_token() {
		$access_token = apply_filters( 'facebook_open_graph_update_access_token', '' );

		return $access_token;
	}
}

function facebookopengraphupdate_load() {
	$facebookopengraphupdate = new FacebookOpenGraphUpdate();
}
add_action( 'plugins_loaded', 'facebookopengraphupdate_load' );