410 lines
13 KiB
PHP
410 lines
13 KiB
PHP
<?php
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/**
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* This is the class for integrating ActivityPub into the Friends Plugin.
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*
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* @since 0.14
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*
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* @package ActivityPub
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* @author Alex Kirk
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*/
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namespace Activitypub;
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class Friends_Feed_Parser_ActivityPub extends \Friends\Feed_Parser {
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const SLUG = 'activitypub';
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const NAME = 'ActivityPub';
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const URL = 'https://www.w3.org/TR/activitypub/';
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private $friends_feed;
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/**
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* Constructor.
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*
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* @param \Friends\Feed $friends_feed The friends feed
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*/
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public function __construct( \Friends\Feed $friends_feed ) {
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$this->friends_feed = $friends_feed;
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\add_action( 'activitypub_inbox', array( $this, 'handle_received_activity' ), 10, 3 );
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\add_action( 'friends_user_feed_activated', array( $this, 'queue_follow_user' ), 10 );
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\add_action( 'friends_user_feed_deactivated', array( $this, 'queue_unfollow_user' ), 10 );
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\add_action( 'friends_feed_parser_activitypub_follow', array( $this, 'follow_user' ), 10, 2 );
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\add_action( 'friends_feed_parser_activitypub_unfollow', array( $this, 'unfollow_user' ), 10, 2 );
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\add_filter( 'friends_rewrite_incoming_url', array( $this, 'friends_rewrite_incoming_url' ), 10, 2 );
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}
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/**
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* Allow logging a message via an action.
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* @param string $message The message to log.
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* @param array $objects Optional objects as meta data.
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* @return void
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*/
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private function log( $message, $objects = array() ) {
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do_action( 'friends_activitypub_log', $message, $objects );
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}
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/**
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* Determines if this is a supported feed and to what degree we feel it's supported.
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*
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* @param string $url The url.
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* @param string $mime_type The mime type.
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* @param string $title The title.
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* @param string|null $content The content, it can't be assumed that it's always available.
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*
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* @return int Return 0 if unsupported, a positive value representing the confidence for the feed, use 10 if you're reasonably confident.
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*/
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public function feed_support_confidence( $url, $mime_type, $title, $content = null ) {
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if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $url ) ) {
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return 10;
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}
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return 0;
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}
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/**
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* Format the feed title and autoselect the posts feed.
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*
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* @param array $feed_details The feed details.
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*
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* @return array The (potentially) modified feed details.
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*/
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public function update_feed_details( $feed_details ) {
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$meta = \Activitypub\get_remote_metadata_by_actor( $feed_details['url'] );
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if ( ! $meta || is_wp_error( $meta ) ) {
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return $meta;
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}
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if ( isset( $meta['name'] ) ) {
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$feed_details['title'] = $meta['name'];
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} elseif ( isset( $meta['preferredUsername'] ) ) {
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$feed_details['title'] = $meta['preferredUsername'];
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}
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if ( isset( $meta['id'] ) ) {
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$feed_details['url'] = $meta['id'];
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}
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return $feed_details;
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}
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/**
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* Rewrite a Mastodon style URL @username@server to a URL via webfinger.
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*
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* @param string $url The URL to filter.
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* @param string $incoming_url Potentially a mastodon identifier.
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*
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* @return <type> ( description_of_the_return_value )
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*/
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public function friends_rewrite_incoming_url( $url, $incoming_url ) {
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if ( preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $incoming_url ) ) {
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$resolved_url = \Activitypub\Webfinger::resolve( $incoming_url );
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if ( ! is_wp_error( $resolved_url ) ) {
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return $resolved_url;
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}
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}
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return $url;
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}
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/**
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* Discover the feeds available at the URL specified.
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*
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* @param string $content The content for the URL is already provided here.
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* @param string $url The url to search.
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*
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* @return array A list of supported feeds at the URL.
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*/
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public function discover_available_feeds( $content, $url ) {
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$discovered_feeds = array();
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$meta = \Activitypub\get_remote_metadata_by_actor( $url );
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if ( $meta && ! is_wp_error( $meta ) ) {
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$discovered_feeds[ $meta['id'] ] = array(
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'type' => 'application/activity+json',
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'rel' => 'self',
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'post-format' => 'status',
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'parser' => self::SLUG,
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'autoselect' => true,
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);
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}
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return $discovered_feeds;
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}
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/**
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* Fetches a feed and returns the processed items.
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*
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* @param string $url The url.
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*
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* @return array An array of feed items.
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*/
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public function fetch_feed( $url ) {
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// There is no feed to fetch, we'll receive items via ActivityPub.
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return array();
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}
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/**
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* Handles "Create" requests
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*
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* @param array $object The activity-object
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* @param int $user_id The id of the local blog-user
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* @param string $type The type of the activity.
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*/
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public function handle_received_activity( $object, $user_id, $type ) {
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if ( ! in_array(
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$type,
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array(
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// We don't need to handle 'Accept' types since it's handled by the ActivityPub plugin itself.
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'create',
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'announce',
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),
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true
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) ) {
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return false;
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}
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$actor_url = $object['actor'];
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$user_feed = false;
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if ( \wp_http_validate_url( $actor_url ) ) {
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// Let's check if we follow this actor. If not it might be a different URL representation.
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$user_feed = $this->friends_feed->get_user_feed_by_url( $actor_url );
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}
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if ( is_wp_error( $user_feed ) || ! \wp_http_validate_url( $actor_url ) ) {
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$meta = \Activitypub\get_remote_metadata_by_actor( $actor_url );
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if ( ! $meta || ! isset( $meta['url'] ) ) {
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$this->log( 'Received invalid meta for ' . $actor_url );
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return false;
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}
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$actor_url = $meta['url'];
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if ( ! \wp_http_validate_url( $actor_url ) ) {
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$this->log( 'Received invalid meta url for ' . $actor_url );
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return false;
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}
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}
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$user_feed = $this->friends_feed->get_user_feed_by_url( $actor_url );
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if ( ! $user_feed || is_wp_error( $user_feed ) ) {
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$this->log( 'We\'re not following ' . $actor_url );
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// We're not following this user.
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return false;
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}
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switch ( $type ) {
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case 'create':
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return $this->handle_incoming_post( $object['object'], $user_feed );
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case 'announce':
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return $this->handle_incoming_announce( $object['object'], $user_feed, $user_id );
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}
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return true;
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}
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/**
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* Map the Activity type to a post fomat.
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*
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* @param string $type The type.
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*
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* @return string The determined post format.
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*/
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private function map_type_to_post_format( $type ) {
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return 'status';
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}
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/**
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* We received a post for a feed, handle it.
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*
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* @param array $object The object from ActivityPub.
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* @param \Friends\User_Feed $user_feed The user feed.
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*/
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private function handle_incoming_post( $object, \Friends\User_Feed $user_feed ) {
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$permalink = $object['id'];
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if ( isset( $object['url'] ) ) {
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$permalink = $object['url'];
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}
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$data = array(
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'permalink' => $permalink,
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'content' => $object['content'],
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'post_format' => $this->map_type_to_post_format( $object['type'] ),
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'date' => $object['published'],
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);
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if ( isset( $object['attributedTo'] ) ) {
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$meta = \Activitypub\get_remote_metadata_by_actor( $object['attributedTo'] );
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$this->log( 'Attributed to ' . $object['attributedTo'], compact( 'meta' ) );
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if ( isset( $meta['name'] ) ) {
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$data['author'] = $meta['name'];
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} elseif ( isset( $meta['preferredUsername'] ) ) {
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$data['author'] = $meta['preferredUsername'];
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}
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}
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if ( ! empty( $object['attachment'] ) ) {
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foreach ( $object['attachment'] as $attachment ) {
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if ( ! isset( $attachment['type'] ) || ! isset( $attachment['mediaType'] ) ) {
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continue;
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}
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if ( 'Document' !== $attachment['type'] || strpos( $attachment['mediaType'], 'image/' ) !== 0 ) {
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continue;
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}
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$data['content'] .= PHP_EOL;
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$data['content'] .= '<!-- wp:image -->';
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$data['content'] .= '<p><img src="' . esc_url( $attachment['url'] ) . '" width="' . esc_attr( $attachment['width'] ) . '" height="' . esc_attr( $attachment['height'] ) . '" class="size-full" /></p>';
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$data['content'] .= '<!-- /wp:image -->';
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}
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$meta = \Activitypub\get_remote_metadata_by_actor( $object['attributedTo'] );
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$this->log( 'Attributed to ' . $object['attributedTo'], compact( 'meta' ) );
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if ( isset( $meta['name'] ) ) {
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$data['author'] = $meta['name'];
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} elseif ( isset( $meta['preferredUsername'] ) ) {
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$data['author'] = $meta['preferredUsername'];
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}
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}
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$this->log(
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'Received feed item',
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array(
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'url' => $permalink,
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'data' => $data,
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)
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);
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$item = new \Friends\Feed_Item( $data );
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$this->friends_feed->process_incoming_feed_items( array( $item ), $user_feed );
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return true;
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}
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/**
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* We received an announced URL (boost) for a feed, handle it.
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*
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* @param array $url The announced URL.
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* @param \Friends\User_Feed $user_feed The user feed.
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*/
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private function handle_incoming_announce( $url, \Friends\User_Feed $user_feed, $user_id ) {
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if ( ! \wp_http_validate_url( $url ) ) {
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$this->log( 'Received invalid announce', compact( 'url' ) );
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return false;
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}
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$this->log( 'Received announce for ' . $url );
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$response = \Activitypub\safe_remote_get( $url, $user_id );
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if ( \is_wp_error( $response ) ) {
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return $response;
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}
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$json = \wp_remote_retrieve_body( $response );
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$object = \json_decode( $json, true );
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if ( ! $object ) {
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$this->log( 'Received invalid json', compact( 'json' ) );
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return false;
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}
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$this->log( 'Received response', compact( 'url', 'object' ) );
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return $this->handle_incoming_post( $object, $user_feed );
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}
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/**
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* Prepare to follow the user via a scheduled event.
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*
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* @param \Friends\User_Feed $user_feed The user feed.
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*
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* @return bool|WP_Error Whether the event was queued.
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*/
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public function queue_follow_user( \Friends\User_Feed $user_feed ) {
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if ( self::SLUG !== $user_feed->get_parser() ) {
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return;
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}
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$args = array( $user_feed->get_url(), get_current_user_id() );
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$unfollow_timestamp = wp_next_scheduled( 'friends_feed_parser_activitypub_unfollow', $args );
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if ( $unfollow_timestamp ) {
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// If we just unfollowed, we don't want the event to potentially be executed after our follow event.
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wp_unschedule_event( $unfollow_timestamp, $args );
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}
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if ( wp_next_scheduled( 'friends_feed_parser_activitypub_follow', $args ) ) {
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return;
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}
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return \wp_schedule_single_event( \time(), 'friends_feed_parser_activitypub_follow', $args );
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}
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/**
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* Follow a user via ActivityPub at a URL.
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*
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* @param string $url The url.
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* @param int $user_id The current user id.
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*/
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public function follow_user( $url, $user_id ) {
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$meta = \Activitypub\get_remote_metadata_by_actor( $url );
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$to = $meta['id'];
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$inbox = \Activitypub\get_inbox_by_actor( $to );
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$actor = \get_author_posts_url( $user_id );
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$activity = new \Activitypub\Model\Activity( 'Follow', \Activitypub\Model\Activity::TYPE_SIMPLE );
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$activity->set_to( null );
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$activity->set_cc( null );
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$activity->set_actor( $actor );
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$activity->set_object( $to );
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$activity->set_id( $actor . '#follow-' . \preg_replace( '~^https?://~', '', $to ) );
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$activity = $activity->to_json();
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\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
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}
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/**
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* Prepare to unfollow the user via a scheduled event.
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*
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* @param \Friends\User_Feed $user_feed The user feed.
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*
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* @return bool|WP_Error Whether the event was queued.
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*/
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public function queue_unfollow_user( \Friends\User_Feed $user_feed ) {
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if ( self::SLUG !== $user_feed->get_parser() ) {
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return false;
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}
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$args = array( $user_feed->get_url(), get_current_user_id() );
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$follow_timestamp = wp_next_scheduled( 'friends_feed_parser_activitypub_follow', $args );
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if ( $follow_timestamp ) {
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// If we just followed, we don't want the event to potentially be executed after our unfollow event.
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wp_unschedule_event( $follow_timestamp, $args );
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}
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if ( wp_next_scheduled( 'friends_feed_parser_activitypub_unfollow', $args ) ) {
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return true;
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}
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return \wp_schedule_single_event( \time(), 'friends_feed_parser_activitypub_unfollow', $args );
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}
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/**
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* Unfllow a user via ActivityPub at a URL.
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*
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* @param string $url The url.
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* @param int $user_id The current user id.
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*/
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public function unfollow_user( $url, $user_id ) {
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$meta = \Activitypub\get_remote_metadata_by_actor( $url );
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$to = $meta['id'];
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$inbox = \Activitypub\get_inbox_by_actor( $to );
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$actor = \get_author_posts_url( $user_id );
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$activity = new \Activitypub\Model\Activity( 'Undo', \Activitypub\Model\Activity::TYPE_SIMPLE );
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$activity->set_to( null );
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$activity->set_cc( null );
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$activity->set_actor( $actor );
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$activity->set_object(
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array(
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'type' => 'Follow',
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'actor' => $actor,
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'object' => $to,
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'id' => $to,
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)
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);
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$activity->set_id( $actor . '#unfollow-' . \preg_replace( '~^https?://~', '', $to ) );
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$activity = $activity->to_json();
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\Activitypub\safe_remote_post( $inbox, $activity, $user_id );
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}
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}
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