facebook-instant-articles.php

<?php
/**
 * Plugin Name: Instant Articles for WP
 * Description: Add support for Instant Articles for Facebook to your WordPress site.
 * Author: Automattic, Dekode, Facebook
 * Author URI: https://vip.wordpress.com/plugins/instant-articles/
 * Version: 2.0
 * Text Domain: instant-articles
 * License: GPLv2
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * @package default
 */

$autoloader = require __DIR__ . '/vendor/autoload.php';
$autoloader->add( 'Facebook\\', __DIR__ . '/vendor/facebook/facebook-instant-articles-sdk-php/src' );

// Configures log to go through console.
\Logger::configure(
	array(
		'rootLogger' => array(
			'appenders' => array( 'facebook-instantarticles-transformer' ),
		),
		'appenders' => array(
			'facebook-instantarticles-transformer' => array(
				'class' => 'LoggerAppenderConsole',
				'threshold' => 'INFO',
				'layout' => array(
					'class' => 'LoggerLayoutSimple',
				),
			),
			'facebook-instantarticles-client' => array(
				'class' => 'LoggerAppenderConsole',
				'threshold' => 'INFO',
				'layout' => array(
					'class' => 'LoggerLayoutSimple',
				),
			),
			'instantarticles-wp-plugin' => array(
				'class' => 'LoggerAppenderConsole',
				'threshold' => 'INFO',
				'layout' => array(
					'class' => 'LoggerLayoutSimple',
				),
			),
		),
	)
);


defined( 'ABSPATH' ) || die( 'Shame on you' );

define( 'IA_PLUGIN_PATH_FULL', __FILE__ );
define( 'IA_PLUGIN_PATH', plugin_basename( __FILE__ ) );
define( 'IA_PLUGIN_FILE_BASENAME', pathinfo( __FILE__, PATHINFO_FILENAME ) );
define( 'IA_PLUGIN_TEXT_DOMAIN', 'instant-articles' );

// Let users define their own feed slug.
if ( ! defined( 'INSTANT_ARTICLES_SLUG' ) ) {
	define( 'INSTANT_ARTICLES_SLUG', 'instant-articles' );
}

require_once( dirname( __FILE__ ) . '/embeds.php' );
require_once( dirname( __FILE__ ) . '/class-instant-articles-post.php' );
require_once( dirname( __FILE__ ) . '/settings/class-instant-articles-settings.php' );
require_once( dirname( __FILE__ ) . '/meta-box/class-instant-articles-meta-box.php' );
require_once( dirname( __FILE__ ) . '/class-instant-articles-publisher.php' );

/**
 * Plugin activation hook to add our rewrite rules.
 *
 * @since 0.1
 */
function instant_articles_activate() {
	instant_articles_init();
	flush_rewrite_rules();
}
register_activation_hook( __FILE__, 'instant_articles_activate' );

/**
 * Plugin activation hook to remove our rewrite rules.
 *
 * @since 0.1
 */
function instant_articles_deactivate() {
	flush_rewrite_rules();
}
register_deactivation_hook( __FILE__, 'instant_articles_deactivate' );

/**
 * Load plugin textdomain.
 *
 * @since 0.1
 */
function instant_articles_load_textdomain() {
	load_plugin_textdomain( 'instant-articles', false, plugin_dir_path( __FILE__ ) . '/languages' );
}
add_action( 'plugins_loaded', 'instant_articles_load_textdomain' );

/**
 * Plugin hook to load compat layers.
 *
 * @since 2.0
 */
function instant_articles_load_compat() {
	require_once( dirname( __FILE__ ) . '/compat.php' );
}
add_action( 'plugins_loaded', 'instant_articles_load_compat' );

/**
 * Register our special feed.
 *
 * @since 0.1
 */
function instant_articles_init() {
	add_feed( INSTANT_ARTICLES_SLUG, 'instant_articles_feed' );
}
add_action( 'init', 'instant_articles_init' );


/**
 * Feed display callback.
 *
 * @since 0.1
 */
function instant_articles_feed() {

	// Load the feed template.
	include( dirname( __FILE__ ) . '/feed-template.php' );

}


/**
 * Modify the main query for our feed.
 *
 * We want the posts in the modified order, to provide Facebook with content updates even for older posts.
 * Facebook will only import 100 posts at the time.
 * Facebook will only update posts modified within the last 24 hours
 *
 * @param WP_Query $query  The WP_Query object. Passed by reference.
 */
function instant_articles_query( $query ) {

	if ( $query->is_main_query() && $query->is_feed( INSTANT_ARTICLES_SLUG ) ) {

		$query->set( 'orderby', 'modified' );
		$query->set( 'posts_per_page', 100 );
		$query->set( 'posts_per_rss', 100 );

		/**
		 * If the constant INSTANT_ARTICLES_LIMIT_POSTS is set to true, we will limit the feed
		 * to only include posts which are modified within the last 24 hours.
		 * Facebook will initially need 100 posts to pass the review, but will only update
		 * already imported articles if they are modified within the last 24 hours.
		 */
		if ( defined( 'INSTANT_ARTICLES_LIMIT_POSTS' ) && INSTANT_ARTICLES_LIMIT_POSTS ) {
			$query->set( 'date_query', array(
				array(
					'column' => 'post_modified',
					'after'  => '1 day ago',
				),
			) );
		}
	}

}
add_action( 'pre_get_posts', 'instant_articles_query', 10, 1 );


/**
 * Filter the SQL query to not include posts with empty content -- FB will complain.
 *
 * @since 0.1
 * @param string   $where  The original where part of the SQL statement.
 * @param WP_Query $query  The WP_Query instance.
 * @return string  The modified where part of the SQL statement.
 */
function instant_articles_query_where( $where, $query ) {

	// Don’t modify the SQL query with a potentially expensive WHERE clause if we’re OK with fewer posts than 100 and are OK with filtering in the loop.
	if ( defined( 'INSTANT_ARTICLES_LIMIT_POSTS' ) && INSTANT_ARTICLES_LIMIT_POSTS ) {
		return $where;
	}

	if ( $query->is_main_query() && $query->is_feed( INSTANT_ARTICLES_SLUG ) ) {
		global $wpdb;
		$where .= " AND {$wpdb->posts}.post_content NOT LIKE ''";
	}
	return $where;

}
add_filter( 'posts_where' , 'instant_articles_query_where', 10, 2 );

/**
 * Register all scripts and styles for the admin UI.
 *
 * @since 0.4
 */
function instant_articles_register_scripts() {
	wp_register_style(
		'instant-articles-meta-box',
		plugins_url( '/css/instant-articles-meta-box.css', __FILE__ )
	);
	wp_register_style(
		'instant-articles-settings-wizard',
		plugins_url( '/css/instant-articles-settings-wizard.css', __FILE__ )
	);

	wp_register_script(
		'instant-articles-meta-box',
		plugins_url( '/js/instant-articles-meta-box.js', __FILE__ )
	);
	wp_register_script(
		'instant-articles-option-ads',
		plugins_url( '/js/instant-articles-option-ads.js', __FILE__ ),
		null,
		null,
		true
	);
	wp_register_script(
		'instant-articles-option-analytics',
		plugins_url( '/js/instant-articles-option-analytics.js', __FILE__ ),
		null,
		null,
		true
	);
	wp_register_script(
		'instant-articles-option-publishing',
		plugins_url( '/js/instant-articles-option-publishing.js', __FILE__ ),
		null,
		null,
		true
	);
	wp_register_script(
		'instant-articles-settings',
		plugins_url( '/js/instant-articles-settings.js', __FILE__ ),
		null,
		null,
		true
	);
}
add_action( 'init', 'instant_articles_register_scripts' );

/**
 * Enqueue all scripts and styles for the admin UI.
 *
 * @since 0.4
 */
function instant_articles_enqueue_scripts() {
	wp_enqueue_style( 'instant-articles-meta-box' );
	wp_enqueue_style( 'instant-articles-settings-wizard' );

	wp_enqueue_script( 'instant-articles-meta-box' );
	wp_enqueue_script( 'instant-articles-option-ads' );
	wp_enqueue_script( 'instant-articles-option-analytics' );
	wp_enqueue_script( 'instant-articles-option-publishing' );
	wp_enqueue_script( 'instant-articles-settings' );
}
add_action( 'admin_enqueue_scripts', 'instant_articles_enqueue_scripts' );

/**
 * Automatically add meta tag for Instant Articles URL claiming
 * when page is set.
 *
 * @since 0.4
 */
function inject_url_claiming_meta_tag() {
	$publishing_settings = Instant_Articles_Option_Publishing::get_option_decoded();
	$fb_page_settings = Instant_Articles_Option_FB_Page::get_option_decoded();

	if ( isset( $fb_page_settings['page_id'] ) ) {
		?>
		<meta property="fb:pages" content="<?php echo absint( $fb_page_settings['page_id'] ); ?>" />
		<?php
	}
}
add_action( 'wp_head', 'inject_url_claiming_meta_tag' );

// Initialize the Instant Articles settings page.
Instant_Articles_Settings::init();

// Initialize the Instant Articles meta box.
Instant_Articles_Meta_Box::init();

// Initialize the Instant Articles publisher.
Instant_Articles_Publisher::init();