513 lines
13 KiB
PHP
513 lines
13 KiB
PHP
<?php
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namespace Activitypub\Transformer;
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use WP_Post;
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use Activitypub\Collection\Users;
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use Activitypub\Model\Blog_User;
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use Activitypub\Activity\Base_Object;
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use function Activitypub\esc_hashtag;
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use function Activitypub\is_single_user;
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use function Activitypub\get_rest_url_by_path;
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use function Activitypub\site_supports_blocks;
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/**
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* WordPress Post Transformer
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*
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* The Post Transformer is responsible for transforming a WP_Post object into different othe
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* Object-Types.
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*
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* Currently supported are:
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*
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* - Activitypub\Activity\Base_Object
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*/
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class Post {
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/**
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* The WP_Post object.
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*
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* @var WP_Post
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*/
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protected $wp_post;
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/**
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* Static function to Transform a WP_Post Object.
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*
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* This helps to chain the output of the Transformer.
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*
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* @param WP_Post $wp_post The WP_Post object
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*
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* @return void
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*/
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public static function transform( WP_Post $wp_post ) {
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return new static( $wp_post );
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}
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/**
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*
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*
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* @param WP_Post $wp_post
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*/
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public function __construct( WP_Post $wp_post ) {
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$this->wp_post = $wp_post;
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}
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/**
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* Transforms the WP_Post object to an ActivityPub Object
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*
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* @see \Activitypub\Activity\Base_Object
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*
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* @return \Activitypub\Activity\Base_Object The ActivityPub Object
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*/
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public function to_object() {
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$wp_post = $this->wp_post;
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$object = new Base_Object();
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$object->set_id( $this->get_id() );
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$object->set_url( $this->get_url() );
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$object->set_type( $this->get_object_type() );
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$published = \strtotime( $wp_post->post_date_gmt );
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$object->set_published( \gmdate( 'Y-m-d\TH:i:s\Z', $published ) );
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$updated = \strtotime( $wp_post->post_modified_gmt );
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if ( $updated > $published ) {
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$object->set_updated( \gmdate( 'Y-m-d\TH:i:s\Z', $updated ) );
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}
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$object->set_attributed_to( $this->get_attributed_to() );
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$object->set_content( $this->get_content() );
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$object->set_content_map(
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array(
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\strstr( \get_locale(), '_', true ) => $this->get_content(),
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)
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);
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$path = sprintf( 'users/%d/followers', intval( $wp_post->post_author ) );
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$object->set_to(
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array(
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'https://www.w3.org/ns/activitystreams#Public',
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get_rest_url_by_path( $path ),
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)
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);
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$object->set_cc( $this->get_cc() );
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$object->set_attachment( $this->get_attachments() );
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$object->set_tag( $this->get_tags() );
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return $object;
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}
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/**
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* Returns the ID of the Post.
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*
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* @return string The Posts ID.
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*/
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public function get_id() {
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return $this->get_url();
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}
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/**
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* Returns the URL of the Post.
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*
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* @return string The Posts URL.
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*/
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public function get_url() {
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$post = $this->wp_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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return \esc_url( $permalink );
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}
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/**
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* Returns the User-URL of the Author of the Post.
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*
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* If `single_user` mode is enabled, the URL of the Blog-User is returned.
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*
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* @return string The User-URL.
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*/
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protected function get_attributed_to() {
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if ( is_single_user() ) {
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$user = new Blog_User();
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return $user->get_url();
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}
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return Users::get_by_id( $this->wp_post->post_author )->get_url();
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}
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/**
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* Returns the Image Attachments for this Post, parsed from blocks.
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* @param int $max_images The maximum number of images to return.
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* @param array $image_ids The image IDs to append new IDs to.
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*
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* @return array The image IDs.
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*/
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protected function get_block_image_ids( $max_images, $image_ids = [] ) {
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$blocks = \parse_blocks( $this->wp_post->post_content );
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return self::get_image_ids_from_blocks( $blocks, $image_ids, $max_images );
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}
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/**
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* Recursively get image IDs from blocks.
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* @param array $blocks The blocks to search for image IDs
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* @param array $image_ids The image IDs to append new IDs to
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* @param int $max_images The maximum number of images to return.
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*
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* @return array The image IDs.
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*/
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protected static function get_image_ids_from_blocks( $blocks, $image_ids, $max_images ) {
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foreach ( $blocks as $block ) {
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// recurse into inner blocks
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if ( ! empty( $block['innerBlocks'] ) ) {
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$image_ids = self::get_image_ids_from_blocks( $block['innerBlocks'], $image_ids, $max_images );
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}
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switch ( $block['blockName'] ) {
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case 'core/image':
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case 'core/cover':
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if ( ! empty( $block['attrs']['id'] ) ) {
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$image_ids[] = $block['attrs']['id'];
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}
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break;
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case 'jetpack/slideshow':
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case 'jetpack/tiled-gallery':
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if ( ! empty( $block['attrs']['ids'] ) ) {
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$image_ids = array_merge( $image_ids, $block['attrs']['ids'] );
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}
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break;
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case 'jetpack/image-compare':
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if ( ! empty( $block['attrs']['beforeImageId'] ) ) {
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$image_ids[] = $block['attrs']['beforeImageId'];
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}
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if ( ! empty( $block['attrs']['afterImageId'] ) ) {
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$image_ids[] = $block['attrs']['afterImageId'];
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}
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break;
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}
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// we could be at or over max, stop unneeded work
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if ( count( $image_ids ) >= $max_images ) {
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break;
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}
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}
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// still need to slice it because one gallery could knock us over the limit
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return \array_slice( $image_ids, 0, $max_images );
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}
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/**
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* Generates all Image Attachments for a Post.
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*
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* @return array The Image Attachments.
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*/
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protected function get_attachments() {
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$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 = $this->wp_post->ID;
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$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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// first try to get images that are actually in the post content
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if ( site_supports_blocks() && \has_blocks( $this->wp_post->post_content ) ) {
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$block_image_ids = $this->get_block_image_ids( $max_images, $image_ids );
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$image_ids = \array_merge( $image_ids, $block_image_ids );
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} else {
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// fallback to images attached to the post
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$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[] = $attachment->ID;
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}
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}
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}
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}
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$image_ids = \array_unique( $image_ids );
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// get URLs for each image
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foreach ( $image_ids as $id ) {
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$image_size = 'full';
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/**
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* Filter the image URL returned for each post.
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*
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* @param array|false $thumbnail The image URL, or false if no image is available.
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* @param int $id The attachment ID.
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* @param string $image_size The image size to retrieve. Set to 'full' by default.
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*/
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$thumbnail = apply_filters(
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'activitypub_get_image',
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$this->get_image( $id, $image_size ),
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$id,
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$image_size
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);
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if ( $thumbnail ) {
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$mimetype = \get_post_mime_type( $id );
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$alt = \get_post_meta( $id, '_wp_attachment_image_alt', true );
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$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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return $images;
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}
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/**
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* Return details about an image attachment.
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*
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* @param int $id The attachment ID.
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* @param string $image_size The image size to retrieve. Set to 'full' by default.
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*
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* @return array|false Array of image data, or boolean false if no image is available.
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*/
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protected function get_image( $id, $image_size = 'full' ) {
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/**
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* Hook into the image retrieval process. Before image retrieval.
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*
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* @param int $id The attachment ID.
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* @param string $image_size The image size to retrieve. Set to 'full' by default.
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*/
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do_action( 'activitypub_get_image_pre', $id, $image_size );
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$thumbnail = \wp_get_attachment_image_src( $id, $image_size );
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/**
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* Hook into the image retrieval process. After image retrieval.
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*
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* @param int $id The attachment ID.
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* @param string $image_size The image size to retrieve. Set to 'full' by default.
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*/
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do_action( 'activitypub_get_image_post', $id, $image_size );
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return $thumbnail;
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}
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/**
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* Returns the ActivityStreams 2.0 Object-Type for a Post based on the
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* settings and the Post-Type.
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*
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* @see https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
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*
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* @return string The Object-Type.
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*/
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protected function get_object_type() {
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if ( 'wordpress-post-format' !== \get_option( 'activitypub_object_type', 'note' ) ) {
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return \ucfirst( \get_option( 'activitypub_object_type', 'note' ) );
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}
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$post_type = \get_post_type( $this->wp_post );
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switch ( $post_type ) {
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case 'post':
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$post_format = \get_post_format( $this->wp_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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return $object_type;
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}
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/**
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* Returns a list of Mentions, used in the Post.
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*
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* @see https://docs.joinmastodon.org/spec/activitypub/#Mention
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*
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* @return array The list of Mentions.
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*/
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protected function get_cc() {
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$cc = array();
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$mentions = $this->get_mentions();
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if ( $mentions ) {
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foreach ( $mentions as $url ) {
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$cc[] = $url;
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}
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}
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return $cc;
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}
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/**
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* Returns a list of Tags, used in the Post.
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*
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* This includes Hash-Tags and Mentions.
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*
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* @return array The list of Tags.
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*/
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protected function get_tags() {
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$tags = array();
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$post_tags = \get_the_tags( $this->wp_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' => \esc_url( \get_tag_link( $post_tag->term_id ) ),
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'name' => esc_hashtag( $post_tag->name ),
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);
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$tags[] = $tag;
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}
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}
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$mentions = $this->get_mentions();
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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' => \esc_url( $url ),
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'name' => \esc_html( $mention ),
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);
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$tags[] = $tag;
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}
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}
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return $tags;
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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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* The content will be generated based on the user settings.
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*
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* @return string The content.
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*/
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protected function get_content() {
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global $post;
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/**
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* Provides an action hook so plugins can add their own hooks/filters before AP content is generated.
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*
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* Example: if a plugin adds a filter to `the_content` to add a button to the end of posts, it can also remove that filter here.
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*
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* @param WP_Post $post The post object.
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*/
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do_action( 'activitypub_before_get_content', $post );
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// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
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$post = $this->wp_post;
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$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( $content );
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$content = \preg_replace( '/[\n\r\t]/', '', $content );
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$content = \trim( $content );
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$content = \apply_filters( 'activitypub_the_content', $content, $post );
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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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protected 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_permalink type=\"html\"]\n\n[ap_hashtags]";
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}
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return \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
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}
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/**
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* Helper function to get the @-Mentions from the post content.
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*
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* @return array The list of @-Mentions.
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*/
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protected function get_mentions() {
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return apply_filters( 'activitypub_extract_mentions', array(), $this->wp_post->post_content, $this->wp_post );
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}
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}
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