737 lines
20 KiB
PHP
737 lines
20 KiB
PHP
<?php
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/**
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* Base Transformer Class file.
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*
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* @package Activitypub
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*/
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namespace Activitypub\Transformer;
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use Activitypub\Activity\Activity;
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use Activitypub\Activity\Base_Object;
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use Activitypub\Collection\Actors;
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use Activitypub\Http;
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use function Activitypub\get_upload_baseurl;
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use function Activitypub\object_to_uri;
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/**
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* WordPress Base Transformer.
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*
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* Transformers are responsible for transforming WordPress objects into different ActivityPub
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* Object-Types or Activities.
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*
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* @method string|null get_content() Returns the content for the transformed item.
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* @method string|array|null get_icon() Returns an icon for the transformed item.
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* @method string|null get_id() Returns the ID for the transformed item.
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* @method string|null get_name() Returns the name for the transformed item.
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* @method string|null get_summary() Returns the summary for the transformed item.
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*/
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abstract class Base {
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/**
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* The WP_Post or WP_Comment object.
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*
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* This is the source object of the transformer.
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*
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* @var \WP_Post|\WP_Comment|Base_Object|string|array|\WP_Term
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*/
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protected $item;
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/**
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* The WP_Post or WP_Comment object.
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*
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* @deprecated version 5.0.0
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*
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* @var \WP_Post|\WP_Comment
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*/
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protected $wp_object;
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/**
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* The content visibility.
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*
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* @var string
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*/
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protected $content_visibility;
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/**
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* Static function to Transform a WordPress 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_Comment|Base_Object|string|array|\WP_term $item The item that should be transformed.
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*
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* @return Base
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*/
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public static function transform( $item ) {
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return new static( $item );
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}
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/**
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* Base constructor.
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*
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* @param \WP_Post|\WP_Comment|Base_Object|string|array|\WP_Term $item The item that should be transformed.
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*/
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public function __construct( $item ) {
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$this->item = $item;
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$this->wp_object = $item;
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}
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/**
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* Transform all properties with available get(ter) functions.
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*
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* @param Base_Object $activity_object The ActivityPub Object.
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*
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* @return Base_Object|\WP_Error The transformed ActivityPub Object or WP_Error on failure.
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*/
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protected function transform_object_properties( $activity_object ) {
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if ( ! $activity_object || \is_wp_error( $activity_object ) ) {
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return $activity_object;
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}
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// Save activity in the context of an activitypub request.
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\add_filter( 'activitypub_is_activitypub_request', '__return_true' );
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$vars = $activity_object->get_object_var_keys();
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foreach ( $vars as $var ) {
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$getter = 'get_' . $var;
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if ( \method_exists( $this, $getter ) ) {
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$value = \call_user_func( array( $this, $getter ) );
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if ( null !== $value ) {
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$setter = 'set_' . $var;
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/**
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* Filter the value before it is set to the Activity-Object `$activity_object`.
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*
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* @param mixed $value The value that should be set.
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* @param mixed $item The Object.
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*/
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$value = \apply_filters( "activitypub_transform_{$setter}", $value, $this->item );
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/**
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* Filter the value before it is set to the Activity-Object `$activity_object`.
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*
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* @param mixed $value The value that should be set.
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* @param string $var The variable name.
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* @param mixed $item The Object.
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*/
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$value = \apply_filters( 'activitypub_transform_set', $value, $var, $this->item );
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\call_user_func( array( $activity_object, $setter ), $value );
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}
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}
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}
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// Remove activity in the context of an activitypub request.
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\remove_filter( 'activitypub_is_activitypub_request', '__return_true' );
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return $activity_object;
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}
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/**
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* Transform the item into an ActivityPub Object.
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*
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* @return Base_Object The Activity-Object.
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*/
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public function to_object() {
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$activity_object = new Base_Object();
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$activity_object = $this->transform_object_properties( $activity_object );
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if ( \is_wp_error( $activity_object ) ) {
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return $activity_object;
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}
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return $this->set_audience( $activity_object );
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}
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/**
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* Get the content visibility.
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*
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* @return string The content visibility.
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*/
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public function get_content_visibility() {
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if ( ! $this->content_visibility ) {
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return ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC;
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}
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return $this->content_visibility;
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}
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/**
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* Set the content visibility.
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*
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* @param string $content_visibility The content visibility.
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*/
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public function set_content_visibility( $content_visibility ) {
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$this->content_visibility = $content_visibility;
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return $this;
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}
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/**
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* Set the audience.
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*
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* @param Base_Object $activity_object The ActivityPub Object.
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*
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* @return Base_Object The ActivityPub Object.
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*/
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protected function set_audience( $activity_object ) {
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$public = 'https://www.w3.org/ns/activitystreams#Public';
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$followers = null;
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$replied_to = null;
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$actor = Actors::get_by_resource( $this->get_attributed_to() );
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if ( ! \is_wp_error( $actor ) ) {
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$followers = $actor->get_followers();
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}
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$mentions = array_values( $this->get_mentions() );
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if ( $this->get_in_reply_to() ) {
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$object = Http::get_remote_object( $this->get_in_reply_to() );
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if ( $object && ! \is_wp_error( $object ) && isset( $object['attributedTo'] ) ) {
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$replied_to = array( object_to_uri( $object['attributedTo'] ) );
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}
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}
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switch ( $this->get_content_visibility() ) {
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case ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC:
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$activity_object->add_to( $public );
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$activity_object->add_cc( $followers );
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$activity_object->add_cc( $mentions );
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$activity_object->add_cc( $replied_to );
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break;
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case ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC:
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$activity_object->add_to( $followers );
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$activity_object->add_to( $mentions );
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$activity_object->add_to( $replied_to );
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$activity_object->add_cc( $public );
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break;
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case ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE:
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$activity_object->add_to( $mentions );
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$activity_object->add_to( $replied_to );
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}
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return $activity_object;
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}
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/**
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* Transform the item to an ActivityPub ID.
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*
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* @return string The ID of the WordPress Object.
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*/
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public function to_id() {
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/* @var Attachment|Comment|Json|Post|User $this Object transformer. */
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return $this->get_id();
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}
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/**
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* Returns a Tombstone object for the item.
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*
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* @return Base_Object The Tombstone object.
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*/
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public function to_tombstone() {
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$object = new Base_Object();
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$object->set_type( 'Tombstone' );
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$object->set_id( $this->to_id() );
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return $object;
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}
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/**
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* Transforms the ActivityPub Object to an Activity
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*
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* @param string $type The Activity-Type.
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*
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* @return Activity The Activity.
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*/
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public function to_activity( $type ) {
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$object = $this->to_object();
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$activity = new Activity();
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$activity->set_type( $type );
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// Pre-fill the Activity with data (for example, cc and to).
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$activity->set_object( $object );
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// Use simple Object (only ID-URI) for Like and Announce.
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if ( 'Like' === $type ) {
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$activity->set_object( $object->get_id() );
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}
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return $activity;
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}
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/**
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* Returns a generic locale based on the Blog settings.
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*
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* @return string The locale of the blog.
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*/
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protected function get_locale() {
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$lang = \strtolower( \strtok( \get_locale(), '_-' ) );
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/**
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* Filter the locale of the post.
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*
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* @param string $lang The locale of the post.
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* @param mixed $item The post object.
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*
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* @return string The filtered locale of the post.
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*/
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return apply_filters( 'activitypub_locale', $lang, $this->item );
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}
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/**
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* Returns the default media type for an Object.
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*
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* @return string The media type.
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*/
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public function get_media_type() {
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return 'text/html';
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}
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/**
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* Returns the content map for the post.
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*
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* @return array|null The content map for the post or null if not set.
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*/
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protected function get_content_map() {
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if ( ! \method_exists( $this, 'get_content' ) || ! $this->get_content() ) {
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return null;
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}
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return array(
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$this->get_locale() => $this->get_content(),
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);
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}
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/**
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* Returns the name map for the post.
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*
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* @return array|null The name map for the post or null if not set.
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*/
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protected function get_name_map() {
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if ( ! \method_exists( $this, 'get_name' ) || ! $this->get_name() ) {
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return null;
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}
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return array(
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$this->get_locale() => $this->get_name(),
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);
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}
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/**
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* Returns the summary map for the post.
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*
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* @return array|null The summary map for the post or null if not set.
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*/
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protected function get_summary_map() {
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if ( ! \method_exists( $this, 'get_summary' ) || ! $this->get_summary() ) {
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return null;
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}
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return array(
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$this->get_locale() => $this->get_summary(),
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);
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}
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/**
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* Returns the tags for the post.
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*
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* @return array The tags for the post.
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*/
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protected function get_tag() {
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$tags = array();
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$mentions = $this->get_mentions();
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foreach ( $mentions as $mention => $url ) {
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$tags[] = 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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}
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return \array_unique( $tags, SORT_REGULAR );
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}
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/**
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* Get the attributed to.
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*
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* @return string The attributed to.
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*/
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protected function get_attributed_to() {
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return null;
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}
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/**
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* Extracts mentions from the content.
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*
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* @return array The mentions.
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*/
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protected function get_mentions() {
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$content = '';
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if ( method_exists( $this, 'get_content' ) ) {
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$content = $content . ' ' . $this->get_content();
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}
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if ( method_exists( $this, 'get_summary' ) ) {
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$content = $content . ' ' . $this->get_summary();
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}
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/**
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* Filter the mentions in the post content.
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*
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* @param array $mentions The mentions.
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* @param string $content The post content.
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* @param \WP_Post $post The post object.
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*
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* @return array The filtered mentions.
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*/
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return apply_filters(
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'activitypub_extract_mentions',
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array(),
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$content,
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$this->item
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);
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}
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/**
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* Returns the in reply to.
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*
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* @return string|array|null The in reply to.
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*/
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protected function get_in_reply_to() {
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return null;
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}
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/**
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* Parse HTML content for image tags and extract attachment information.
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*
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* This method is used by both Post and Comment transformers to find images
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* embedded in HTML content and extract their attachment IDs and alt text.
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*
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* @param array $media The existing media array grouped by type.
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* @param int $max_images Maximum number of images to extract.
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* @param string $content The HTML content to parse.
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*
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* @return array The updated media array with found images.
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*/
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protected function parse_html_images( $media, $max_images, $content ) {
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// If someone calls that function directly, bail.
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if ( ! \class_exists( '\WP_HTML_Tag_Processor' ) ) {
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return $media;
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}
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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 $media;
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}
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$images = array();
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$base = get_upload_baseurl();
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$tags = new \WP_HTML_Tag_Processor( $content );
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// This linter warning is a false positive - we have to re-count each time here as we modify $images.
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// phpcs:ignore Squiz.PHP.DisallowSizeFunctionsInLoops.Found
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while ( $tags->next_tag( 'img' ) && ( \count( $images ) <= $max_images ) ) {
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/**
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* Filter the image source URL.
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*
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* This can be used to modify the image source URL before it is used to
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* determine the attachment ID.
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*
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* @param string $src The image source URL.
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*/
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$src = \apply_filters( 'activitypub_image_src', $tags->get_attribute( 'src' ) );
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/*
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* If the img source is in our uploads dir, get the
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* associated ID. Note: if there's a -500x500
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* type suffix, we remove it, but we try the original
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* first in case the original image is actually called
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* that. Likewise, we try adding the -scaled suffix for
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* the case that this is a small version of an image
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* that was big enough to get scaled down on upload:
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* https://make.wordpress.org/core/2019/10/09/introducing-handling-of-big-images-in-wordpress-5-3/
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*/
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if ( null !== $src && \str_starts_with( $src, $base ) ) {
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$img_id = \attachment_url_to_postid( $src );
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if ( 0 === $img_id ) {
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$count = 0;
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$src = \strtok( $src, '?' );
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$img_id = \attachment_url_to_postid( $src );
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}
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if ( 0 === $img_id ) {
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$count = 0;
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$src = \preg_replace( '/-(?:\d+x\d+)(\.[a-zA-Z]+)$/', '$1', $src, 1, $count );
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if ( $count > 0 ) {
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$img_id = \attachment_url_to_postid( $src );
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}
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}
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if ( 0 === $img_id ) {
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$src = \preg_replace( '/(\.[a-zA-Z]+)$/', '-scaled$1', $src );
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$img_id = \attachment_url_to_postid( $src );
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}
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if ( 0 !== $img_id ) {
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$images[] = array(
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'id' => $img_id,
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'alt' => $tags->get_attribute( 'alt' ),
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);
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}
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}
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}
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if ( \count( $media['image'] ) <= $max_images ) {
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$media['image'] = \array_merge( $media['image'], $images );
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}
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return $media;
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}
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/**
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* Transforms a WordPress attachment array to ActivityStreams attachment format.
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*
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* @param array $media The WordPress attachment array with 'id', optional 'alt', and optional 'icon'.
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*
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* @return array The ActivityStreams attachment array.
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*/
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protected function transform_attachment( $media ) {
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if ( ! isset( $media['id'] ) ) {
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return $media;
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}
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$id = $media['id'];
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$attachment = array();
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$mime_type = \get_post_mime_type( $id );
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$media_type = \strtok( $mime_type, '/' );
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// Switching on image/audio/video.
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switch ( $media_type ) {
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case 'image':
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$image_size = 'large';
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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 $image_size The image size to retrieve. Set to 'large' by default.
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*/
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$thumbnail = \apply_filters( 'activitypub_get_image', $this->get_attachment_image_src( $id, $image_size ), $id, $image_size );
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if ( $thumbnail ) {
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$image = array(
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'type' => 'Image',
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'url' => \esc_url( $thumbnail[0] ),
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'mediaType' => \esc_attr( $mime_type ),
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);
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if ( ! empty( $media['alt'] ) ) {
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$image['name'] = \html_entity_decode( \wp_strip_all_tags( $media['alt'] ), ENT_QUOTES, 'UTF-8' );
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} else {
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$alt = \get_post_meta( $id, '_wp_attachment_image_alt', true );
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if ( $alt ) {
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$image['name'] = \html_entity_decode( \wp_strip_all_tags( $alt ), ENT_QUOTES, 'UTF-8' );
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}
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}
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// Add EXIF metadata using Schema.org exifData property (FEP-ee3a).
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$exif_data = $this->get_exif_data( $id );
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|
if ( $exif_data ) {
|
|
$image['exifData'] = $exif_data;
|
|
}
|
|
|
|
$attachment = $image;
|
|
}
|
|
break;
|
|
|
|
case 'audio':
|
|
case 'video':
|
|
$meta = \wp_get_attachment_metadata( $id );
|
|
$attachment = array(
|
|
'type' => \ucfirst( $media_type ),
|
|
'mediaType' => \esc_attr( $mime_type ),
|
|
'url' => \esc_url( \wp_get_attachment_url( $id ) ),
|
|
'name' => \esc_attr( \get_the_title( $id ) ),
|
|
);
|
|
|
|
// Height and width for videos.
|
|
if ( isset( $meta['width'], $meta['height'] ) ) {
|
|
$attachment['width'] = \esc_attr( $meta['width'] );
|
|
$attachment['height'] = \esc_attr( $meta['height'] );
|
|
}
|
|
|
|
// Use poster image from the block, or fall back to the transformer icon.
|
|
if ( ! empty( $media['icon'] ) ) {
|
|
$attachment['icon'] = \esc_url_raw( $media['icon'] );
|
|
} elseif ( \method_exists( $this, 'get_icon' ) && $this->get_icon() ) {
|
|
$attachment['icon'] = object_to_uri( $this->get_icon() );
|
|
}
|
|
break;
|
|
}
|
|
|
|
/**
|
|
* Filter the attachment for a post.
|
|
*
|
|
* @param array $attachment The attachment.
|
|
* @param int $id The attachment ID.
|
|
*
|
|
* @return array The filtered attachment.
|
|
*/
|
|
return \apply_filters( 'activitypub_attachment', $attachment, $id );
|
|
}
|
|
|
|
/**
|
|
* Return details about an image attachment.
|
|
*
|
|
* @param int $id The attachment ID.
|
|
* @param string $image_size The image size to retrieve. Set to 'large' by default.
|
|
*
|
|
* @return array|false Array of image data, or boolean false if no image is available.
|
|
*/
|
|
protected function get_attachment_image_src( $id, $image_size = 'large' ) {
|
|
/**
|
|
* Hook into the image retrieval process. Before image retrieval.
|
|
*
|
|
* @param int $id The attachment ID.
|
|
* @param string $image_size The image size to retrieve. Set to 'large' by default.
|
|
*/
|
|
\do_action( 'activitypub_get_image_pre', $id, $image_size );
|
|
|
|
$image = \wp_get_attachment_image_src( $id, $image_size );
|
|
|
|
/**
|
|
* Hook into the image retrieval process. After image retrieval.
|
|
*
|
|
* @param int $id The attachment ID.
|
|
* @param string $image_size The image size to retrieve. Set to 'large' by default.
|
|
*/
|
|
\do_action( 'activitypub_get_image_post', $id, $image_size );
|
|
|
|
return $image;
|
|
}
|
|
|
|
/**
|
|
* Get EXIF metadata for an image attachment using Schema.org exifData property.
|
|
*
|
|
* Returns an array of PropertyValue objects as defined in FEP-ee3a.
|
|
*
|
|
* @link https://codeberg.org/fediverse/fep/src/branch/main/fep/ee3a/fep-ee3a.md
|
|
*
|
|
* @param int $attachment_id The attachment ID.
|
|
*
|
|
* @return array|null Array of PropertyValue objects or null if no EXIF data available.
|
|
*/
|
|
protected function get_exif_data( $attachment_id ) {
|
|
$metadata = \wp_get_attachment_metadata( $attachment_id );
|
|
|
|
if ( empty( $metadata['image_meta'] ) ) {
|
|
return null;
|
|
}
|
|
|
|
$image_meta = $metadata['image_meta'];
|
|
$exif_data = array();
|
|
|
|
// Map WordPress image_meta to FEP-ee3a EXIF field names.
|
|
if ( ! empty( $image_meta['created_timestamp'] ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'DateTime',
|
|
'value' => \gmdate( 'Y:m:d H:i:s', (int) $image_meta['created_timestamp'] ),
|
|
);
|
|
}
|
|
|
|
if ( ! empty( $image_meta['shutter_speed'] ) ) {
|
|
$shutter_speed = (float) $image_meta['shutter_speed'];
|
|
// Format shutter speed as a fraction (e.g., "1/100") for speeds faster than 1 second.
|
|
if ( $shutter_speed > 0 && $shutter_speed < 1 ) {
|
|
$value = '1/' . \round( 1 / $shutter_speed );
|
|
} elseif ( $shutter_speed >= 1 ) {
|
|
$value = (string) $shutter_speed;
|
|
}
|
|
if ( isset( $value ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'ExposureTime',
|
|
'value' => $value,
|
|
);
|
|
}
|
|
}
|
|
|
|
if ( ! empty( $image_meta['aperture'] ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'FNumber',
|
|
'value' => 'f/' . (float) $image_meta['aperture'],
|
|
);
|
|
}
|
|
|
|
if ( ! empty( $image_meta['focal_length'] ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'FocalLength',
|
|
'value' => (string) (float) $image_meta['focal_length'],
|
|
);
|
|
}
|
|
|
|
if ( ! empty( $image_meta['iso'] ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'PhotographicSensitivity',
|
|
'value' => (string) (int) $image_meta['iso'],
|
|
);
|
|
}
|
|
|
|
if ( ! empty( $image_meta['camera'] ) ) {
|
|
$exif_data[] = array(
|
|
'@type' => 'PropertyValue',
|
|
'name' => 'Model',
|
|
'value' => \sanitize_text_field( $image_meta['camera'] ),
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Filter the EXIF data for an image attachment.
|
|
*
|
|
* @param array $exif_data Array of PropertyValue objects for Schema.org exifData.
|
|
* @param array $image_meta The WordPress image_meta array.
|
|
* @param int $attachment_id The attachment ID.
|
|
*
|
|
* @return array The filtered EXIF data array.
|
|
*/
|
|
$exif_data = \apply_filters( 'activitypub_image_exif', $exif_data, $image_meta, $attachment_id );
|
|
|
|
return ! empty( $exif_data ) ? $exif_data : null;
|
|
}
|
|
|
|
/**
|
|
* Filter attachments to ensure uniqueness based on their ID.
|
|
*
|
|
* @param array $attachments Array of attachments with 'id' field.
|
|
*
|
|
* @return array Array with duplicate attachments removed.
|
|
*/
|
|
protected function filter_unique_attachments( $attachments ) {
|
|
$seen_ids = array();
|
|
|
|
return \array_filter(
|
|
$attachments,
|
|
static function ( $attachment ) use ( &$seen_ids ) {
|
|
if ( isset( $attachment['id'] ) && ! in_array( $attachment['id'], $seen_ids, true ) ) {
|
|
$seen_ids[] = $attachment['id'];
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
);
|
|
}
|
|
}
|