3f4c44db05
When Jetpack's image CDN is active, core calls to retrieve images return an image served by the CDN. Since Fediverse instances usually fetch and cache the data themselves, we do not need to use the CDN for those images when returned by the ActivityPub plugin. In fact, we really do not want that to happen, as Fediverse instances may get errors when trying to fetch images from the CDN (they may get blocked / rate-limited / ...). Let's hook into Jetpack's CDN to avoid that.
550 lines
12 KiB
PHP
550 lines
12 KiB
PHP
<?php
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namespace Activitypub\Model;
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/**
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* ActivityPub Post Class
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*
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* @author Matthias Pfefferle
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*/
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class Post {
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/**
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* The WordPress Post Object.
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*
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* @var WP_Post
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*/
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private $post;
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/**
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* The Post Author.
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*
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* @var string
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*/
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private $post_author;
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/**
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* The Object ID.
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*
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* @var string
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*/
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private $id;
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/**
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* The Object URL.
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*
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* @var string
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*/
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private $url;
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/**
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* The Object Summary.
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*
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* @var string
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*/
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private $summary;
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/**
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* The Object Summary
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*
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* @var string
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*/
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private $content;
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/**
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* The Object Attachments. This is usually a list of Images.
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*
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* @var array
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*/
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private $attachments;
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/**
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* The Object Tags. This is usually the list of used Hashtags.
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*
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* @var array
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*/
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private $tags;
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/**
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* The Onject Type
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*
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* @var string
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*/
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private $object_type;
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/**
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* The Allowed Tags, used in the content.
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*
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* @var array
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*/
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private $allowed_tags = array(
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'a' => array(
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'href' => array(),
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'title' => array(),
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'class' => array(),
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'rel' => array(),
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),
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'br' => array(),
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'p' => array(
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'class' => array(),
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),
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'span' => array(
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'class' => array(),
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),
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'div' => array(
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'class' => array(),
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),
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'ul' => array(),
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'ol' => array(),
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'li' => array(),
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'strong' => array(
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'class' => array(),
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),
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'b' => array(
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'class' => array(),
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),
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'i' => array(
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'class' => array(),
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),
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'em' => array(
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'class' => array(),
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),
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'blockquote' => array(),
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'cite' => array(),
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);
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/**
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* List of audience
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*
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* Also used for visibility
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*
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* @var array
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*/
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private $to = array( 'https://www.w3.org/ns/activitystreams#Public' );
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/**
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* List of audience
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*
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* Also used for visibility
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*
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* @var array
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*/
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private $cc = array();
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/**
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* Constructor
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*
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* @param WP_Post $post
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*/
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public function __construct( $post ) {
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$this->post = \get_post( $post );
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$this->add_to( \get_rest_url( null, '/activitypub/1.0/users/' . intval( $this->get_post_author() ) . '/followers' ) );
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}
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/**
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* Magic function to implement getter and setter
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*
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* @param string $method
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* @param string $params
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*
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* @return void
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*/
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public function __call( $method, $params ) {
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$var = \strtolower( \substr( $method, 4 ) );
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if ( \strncasecmp( $method, 'get', 3 ) === 0 ) {
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if ( empty( $this->$var ) && ! empty( $this->post->$var ) ) {
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return $this->post->$var;
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}
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return $this->$var;
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}
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if ( \strncasecmp( $method, 'set', 3 ) === 0 ) {
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$this->$var = $params[0];
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}
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if ( \strncasecmp( $method, 'add', 3 ) === 0 ) {
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if ( ! is_array( $this->$var ) ) {
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$this->$var = $params[0];
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}
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if ( is_array( $params[0] ) ) {
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$this->$var = array_merge( $this->$var, $params[0] );
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} else {
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array_push( $this->$var, $params[0] );
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}
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$this->$var = array_unique( $this->$var );
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}
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}
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/**
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* Converts this Object into an Array.
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*
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* @return array
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*/
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public function to_array() {
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$post = $this->post;
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$array = array(
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'id' => $this->get_id(),
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'url' => $this->get_url(),
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'type' => $this->get_object_type(),
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'published' => \gmdate( 'Y-m-d\TH:i:s\Z', \strtotime( $post->post_date_gmt ) ),
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'attributedTo' => \get_author_posts_url( $post->post_author ),
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'summary' => $this->get_summary(),
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'inReplyTo' => null,
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'content' => $this->get_content(),
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'contentMap' => array(
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\strstr( \get_locale(), '_', true ) => $this->get_content(),
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),
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'to' => $this->get_to(),
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'cc' => $this->get_cc(),
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'attachment' => $this->get_attachments(),
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'tag' => $this->get_tags(),
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);
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return \apply_filters( 'activitypub_post', $array, $this->post );
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}
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/**
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* Converts this Object into a JSON String
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*
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* @return string
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*/
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public function to_json() {
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return \wp_json_encode( $this->to_array(), \JSON_HEX_TAG | \JSON_HEX_AMP | \JSON_HEX_QUOT );
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}
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/**
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* Returns the URL of an Activity Object
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*
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* @return string
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*/
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public function get_url() {
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if ( $this->url ) {
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return $this->url;
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}
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$post = $this->post;
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if ( 'trash' === get_post_status( $post ) ) {
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$permalink = \get_post_meta( $post->ID, 'activitypub_canonical_url', true );
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} else {
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$permalink = \get_permalink( $post );
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}
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$this->url = $permalink;
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return $permalink;
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}
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/**
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* Returns the ID of an Activity Object
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*
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* @return string
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*/
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public function get_id() {
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if ( $this->id ) {
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return $this->id;
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}
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$this->id = $this->get_url();
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return $this->id;
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}
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/**
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* Returns a list of Image Attachments
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*
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* @return array
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*/
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public function get_attachments() {
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if ( $this->attachments ) {
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return $this->attachments;
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}
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$max_images = intval( \apply_filters( 'activitypub_max_image_attachments', \get_option( 'activitypub_max_image_attachments', ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS ) ) );
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$images = array();
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// max images can't be negative or zero
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if ( $max_images <= 0 ) {
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return $images;
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}
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$id = $this->post->ID;
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$image_ids = array();
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// list post thumbnail first if this post has one
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if ( \function_exists( 'has_post_thumbnail' ) && \has_post_thumbnail( $id ) ) {
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$image_ids[] = \get_post_thumbnail_id( $id );
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$max_images--;
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}
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if ( $max_images > 0 ) {
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// then list any image attachments
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$query = new \WP_Query(
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array(
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'post_parent' => $id,
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'post_status' => 'inherit',
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'post_type' => 'attachment',
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'post_mime_type' => 'image',
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'order' => 'ASC',
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'orderby' => 'menu_order ID',
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'posts_per_page' => $max_images,
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)
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);
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foreach ( $query->get_posts() as $attachment ) {
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if ( ! \in_array( $attachment->ID, $image_ids, true ) ) {
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$image_ids[] = $attachment->ID;
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}
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}
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}
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$image_ids = \array_unique( $image_ids );
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// get URLs for each image
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foreach ( $image_ids as $id ) {
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$alt = \get_post_meta( $id, '_wp_attachment_image_alt', true );
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/**
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* If you use the Jetpack plugin and its Image CDN, aka Photon,
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* the image strings returned will use the Photon URL.
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* We don't want that since Fediverse instances already do caching on their end.
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* Let the CDN only be used for visitors of the site.
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*/
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if ( class_exists( 'Jetpack_Photon' ) ) {
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\remove_filter( 'image_downsize', array( \Jetpack_Photon::instance(), 'filter_image_downsize' ) );
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}
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$thumbnail = \wp_get_attachment_image_src( $id, 'full' );
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// Re-enable Photon now that the image URL has been built.
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if ( class_exists( 'Jetpack_Photon' ) ) {
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\add_filter( 'image_downsize', array( \Jetpack_Photon::instance(), 'filter_image_downsize' ), 10, 3 );
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}
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$mimetype = \get_post_mime_type( $id );
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if ( $thumbnail ) {
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$image = array(
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'type' => 'Image',
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'url' => $thumbnail[0],
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'mediaType' => $mimetype,
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);
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if ( $alt ) {
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$image['name'] = $alt;
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}
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$images[] = $image;
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}
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}
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$this->attachments = $images;
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return $images;
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}
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/**
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* Returns a list of Tags, used in the Post
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*
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* @return array
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*/
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public function get_tags() {
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if ( $this->tags ) {
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return $this->tags;
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}
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$tags = array();
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$post_tags = \get_the_tags( $this->post->ID );
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if ( $post_tags ) {
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foreach ( $post_tags as $post_tag ) {
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$tag = array(
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'type' => 'Hashtag',
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'href' => \get_tag_link( $post_tag->term_id ),
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'name' => '#' . $post_tag->slug,
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);
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$tags[] = $tag;
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}
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}
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$mentions = apply_filters( 'activitypub_extract_mentions', array(), $this->post->post_content, $this );
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if ( $mentions ) {
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foreach ( $mentions as $mention => $url ) {
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$tag = array(
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'type' => 'Mention',
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'href' => $url,
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'name' => $mention,
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);
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$tags[] = $tag;
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}
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}
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$this->tags = $tags;
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return $tags;
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}
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/**
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* Returns the as2 object-type for a given post
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*
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* @return string the object-type
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*/
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public function get_object_type() {
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if ( $this->object_type ) {
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return $this->object_type;
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}
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if ( 'wordpress-post-format' !== \get_option( 'activitypub_object_type', 'note' ) ) {
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return \ucfirst( \get_option( 'activitypub_object_type', 'note' ) );
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}
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$post_type = \get_post_type( $this->post );
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switch ( $post_type ) {
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case 'post':
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$post_format = \get_post_format( $this->post );
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switch ( $post_format ) {
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case 'aside':
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case 'status':
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case 'quote':
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case 'note':
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$object_type = 'Note';
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break;
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case 'gallery':
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case 'image':
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$object_type = 'Image';
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break;
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case 'video':
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$object_type = 'Video';
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break;
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case 'audio':
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$object_type = 'Audio';
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break;
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default:
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$object_type = 'Article';
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break;
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}
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break;
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case 'page':
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$object_type = 'Page';
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break;
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case 'attachment':
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$mime_type = \get_post_mime_type();
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$media_type = \preg_replace( '/(\/[a-zA-Z]+)/i', '', $mime_type );
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switch ( $media_type ) {
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case 'audio':
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$object_type = 'Audio';
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break;
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case 'video':
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$object_type = 'Video';
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break;
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case 'image':
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$object_type = 'Image';
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break;
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}
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break;
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default:
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$object_type = 'Article';
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break;
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}
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$this->object_type = $object_type;
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return $object_type;
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}
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/**
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* Returns the content for the ActivityPub Item.
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*
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* @return string the content
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*/
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public function get_content() {
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global $post;
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if ( $this->content ) {
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return $this->content;
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}
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// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
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$post = $this->post;
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$content = $this->get_post_content_template();
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// Fill in the shortcodes.
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setup_postdata( $post );
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$content = do_shortcode( $content );
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wp_reset_postdata();
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$content = \wpautop( \wp_kses( $content, $this->allowed_tags ) );
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$content = \trim( \preg_replace( '/[\n\r\t]/', '', $content ) );
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$content = \apply_filters( 'activitypub_the_content', $content, $post );
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$content = \html_entity_decode( $content, \ENT_QUOTES, 'UTF-8' );
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$this->content = $content;
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return $content;
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}
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/**
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* Gets the template to use to generate the content of the activitypub item.
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*
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* @return string the template
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*/
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public function get_post_content_template() {
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if ( 'excerpt' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "[ap_excerpt]\n\n[ap_permalink type=\"html\"]";
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}
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if ( 'title' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "[ap_title]\n\n[ap_permalink type=\"html\"]";
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}
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if ( 'content' === \get_option( 'activitypub_post_content_type', 'content' ) ) {
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return "[ap_content]\n\n[ap_hashtags]\n\n[ap_permalink type=\"html\"]";
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}
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// Upgrade from old template codes to shortcodes.
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$content = self::upgrade_post_content_template();
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return $content;
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}
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/**
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* Updates the custom template to use shortcodes instead of the deprecated templates.
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*
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* @return string the updated template content
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*/
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public static function upgrade_post_content_template() {
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// Get the custom template.
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$old_content = \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
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// If the old content exists but is a blank string, we're going to need a flag to updated it even
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// after setting it to the default contents.
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$need_update = false;
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// If the old contents is blank, use the defaults.
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if ( '' === $old_content ) {
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$old_content = ACTIVITYPUB_CUSTOM_POST_CONTENT;
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$need_update = true;
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}
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// Set the new content to be the old content.
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$content = $old_content;
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// Convert old templates to shortcodes.
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$content = \str_replace( '%title%', '[ap_title]', $content );
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$content = \str_replace( '%excerpt%', '[ap_excerpt]', $content );
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$content = \str_replace( '%content%', '[ap_content]', $content );
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$content = \str_replace( '%permalink%', '[ap_permalink type="html"]', $content );
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$content = \str_replace( '%shortlink%', '[ap_shortlink type="html"]', $content );
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$content = \str_replace( '%hashtags%', '[ap_hashtags]', $content );
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$content = \str_replace( '%tags%', '[ap_hashtags]', $content );
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// Store the new template if required.
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if ( $content !== $old_content || $need_update ) {
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\update_option( 'activitypub_custom_post_content', $content );
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}
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return $content;
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}
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}
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