wordpress-activitypub/activitypub.php

<?php
/**
 * Plugin Name: ActivityPub
 * Plugin URI: https://github.com/pfefferle/wordpress-activitypub/
 * Description: The ActivityPub protocol is a decentralized social networking protocol based upon the ActivityStreams 2.0 data format.
 * Version: 0.15.0
 * Author: Matthias Pfefferle
 * Author URI: https://notiz.blog/
 * License: MIT
 * License URI: http://opensource.org/licenses/MIT
 * Requires PHP: 5.6
 * Text Domain: activitypub
 * Domain Path: /languages
 */

namespace Activitypub;

/**
 * Initialize plugin
 */
function init() {
	\defined( 'ACTIVITYPUB_EXCERPT_LENGTH' ) || \define( 'ACTIVITYPUB_EXCERPT_LENGTH', 400 );
	\defined( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS' ) || \define( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS', 3 );
	\defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
	\defined( 'ACTIVITYPUB_USERNAME_REGEXP' ) || \define( 'ACTIVITYPUB_USERNAME_REGEXP', '(?:([A-Za-z0-9_-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))' );
	\defined( 'ACTIVITYPUB_ALLOWED_HTML' ) || \define( 'ACTIVITYPUB_ALLOWED_HTML', '<strong><a><p><ul><ol><li><code><blockquote><pre><img>' );
	\defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<p><strong>[ap_title]</strong></p>\n\n[ap_content]\n\n<p>[ap_hashtags]</p>\n\n<p>[ap_shortlink]</p>" );
	\define( 'ACTIVITYPUB_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
	\define( 'ACTIVITYPUB_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
	\define( 'ACTIVITYPUB_PLUGIN_FILE', plugin_dir_path( __FILE__ ) . '/' . basename( __FILE__ ) );

	require_once \dirname( __FILE__ ) . '/includes/table/followers-list.php';
	require_once \dirname( __FILE__ ) . '/includes/class-signature.php';
	require_once \dirname( __FILE__ ) . '/includes/class-webfinger.php';
	require_once \dirname( __FILE__ ) . '/includes/peer/class-followers.php';
	require_once \dirname( __FILE__ ) . '/includes/functions.php';

	require_once \dirname( __FILE__ ) . '/includes/model/class-activity.php';
	require_once \dirname( __FILE__ ) . '/includes/model/class-post.php';

	require_once \dirname( __FILE__ ) . '/includes/class-activity-dispatcher.php';
	\Activitypub\Activity_Dispatcher::init();

	require_once \dirname( __FILE__ ) . '/includes/class-activitypub.php';
	\Activitypub\Activitypub::init();

	// Configure the REST API route
	require_once \dirname( __FILE__ ) . '/includes/rest/class-outbox.php';
	\Activitypub\Rest\Outbox::init();

	require_once \dirname( __FILE__ ) . '/includes/rest/class-inbox.php';
	\Activitypub\Rest\Inbox::init();

	require_once \dirname( __FILE__ ) . '/includes/rest/class-followers.php';
	\Activitypub\Rest\Followers::init();

	require_once \dirname( __FILE__ ) . '/includes/rest/class-following.php';
	\Activitypub\Rest\Following::init();

	require_once \dirname( __FILE__ ) . '/includes/rest/class-webfinger.php';
	\Activitypub\Rest\Webfinger::init();

	// load NodeInfo endpoints only if blog is public
	if ( true === (bool) \get_option( 'blog_public', 1 ) ) {
		require_once \dirname( __FILE__ ) . '/includes/rest/class-nodeinfo.php';
		\Activitypub\Rest\NodeInfo::init();
	}

	require_once \dirname( __FILE__ ) . '/includes/class-admin.php';
	\Activitypub\Admin::init();

	require_once \dirname( __FILE__ ) . '/includes/class-hashtag.php';
	\Activitypub\Hashtag::init();

	require_once \dirname( __FILE__ ) . '/includes/class-shortcodes.php';
	\Activitypub\Shortcodes::init();
	
	require_once \dirname( __FILE__ ) . '/includes/class-mention.php';
	\Activitypub\Mention::init();

	require_once \dirname( __FILE__ ) . '/includes/class-debug.php';
	\Activitypub\Debug::init();

	require_once \dirname( __FILE__ ) . '/includes/class-health-check.php';
	\Activitypub\Health_Check::init();

	require_once \dirname( __FILE__ ) . '/includes/rest/class-server.php';
	\add_filter(
		'wp_rest_server_class',
		function() {
			return '\Activitypub\Rest\Server';
		}
	);

	if ( \WP_DEBUG ) {
		require_once \dirname( __FILE__ ) . '/includes/debug.php';
	}
}
\add_action( 'plugins_loaded', '\Activitypub\init' );

/**
 * Add plugin settings link
 */
function plugin_settings_link( $actions ) {
	$settings_link[] = \sprintf(
		'<a href="%1s">%2s</a>',
		\menu_page_url( 'activitypub', false ),
		\__( 'Settings', 'activitypub' )
	);

	return \array_merge( $settings_link, $actions );
}
\add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), '\Activitypub\plugin_settings_link' );

/**
 * Add rewrite rules
 */
function add_rewrite_rules() {
	if ( ! \class_exists( 'Webfinger' ) ) {
		\add_rewrite_rule( '^.well-known/webfinger', 'index.php?rest_route=/activitypub/1.0/webfinger', 'top' );
	}

	if ( ! \class_exists( 'Nodeinfo' ) || ! (bool) \get_option( 'blog_public', 1 ) ) {
		\add_rewrite_rule( '^.well-known/nodeinfo', 'index.php?rest_route=/activitypub/1.0/nodeinfo/discovery', 'top' );
		\add_rewrite_rule( '^.well-known/x-nodeinfo2', 'index.php?rest_route=/activitypub/1.0/nodeinfo2', 'top' );
	}

	\add_rewrite_endpoint( 'activitypub', EP_AUTHORS | EP_PERMALINK | EP_PAGES );
}
\add_action( 'init', '\Activitypub\add_rewrite_rules', 1 );

/**
 * Flush rewrite rules;
 */
function flush_rewrite_rules() {
	\Activitypub\add_rewrite_rules();
	\flush_rewrite_rules();
}
\register_activation_hook( __FILE__, '\Activitypub\flush_rewrite_rules' );
\register_deactivation_hook( __FILE__, '\flush_rewrite_rules' );

/**
 * Only load code that needs BuddyPress to run once BP is loaded and initialized.
 */
function enable_buddypress_features() {
	require_once \dirname( __FILE__ ) . '/integration/class-buddypress.php';
	\Activitypub\Integration\Buddypress::init();
}
add_action( 'bp_include', '\Activitypub\enable_buddypress_features' );

add_action(
	'friends_load_parsers',
	function( \Friends\Feed $friends_feed ) {
		require_once __DIR__ . '/integration/class-friends-feed-parser-activitypub.php';
		$friends_feed->register_parser( Friends_Feed_Parser_ActivityPub::SLUG, new Friends_Feed_Parser_ActivityPub( $friends_feed ) );
	}
);

/**
 * Disable webfinger for known example domains.
*/
add_filter(
	'pre_get_remote_metadata_by_actor',
	function( $metadata, $actor ) {
		if ( ! $metadata ) {
			$username = null;
			$domain = null;
			if ( preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $actor, $m ) ) {
				$username = $m[1];
				$domain = $m[2];
			} else {
				$p = wp_parse_url( $actor );
				if ( $p ) {
					if ( isset( $p['host'] ) ) {
						$domain = $p['host'];
					}
					if ( isset( $p['path'] ) ) {
						$path_parts = explode( '/', trim( $p['path'], '/' ) );
						$username = ltrim( array_pop( $path_parts ), '@' );
					}
				}
			}
			if ( preg_match( '/[^a-zA-Z0-9.-]/', $domain ) ) {// invalid characters
				return $metadata;
			}

			if (
				rtrim( strtok( $domain, '.' ), '0123456789' ) === 'example' // classic example.org domain
				|| preg_match( '/(my|your|our)-(domain)/', $domain )
				|| preg_match( '/(test)/', $domain )
				|| in_array( $username, array( 'example' ), true )
				) {
				$metadata = array(
					'url' => sprintf( 'https://%s/users/%s/', $domain, $username ),
					'name' => $username,
				);
			}
		}
		return $metadata;
	},
	9,
	2
);