André Menrath
5712706457
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339 lines
8.9 KiB
PHP
339 lines
8.9 KiB
PHP
<?php
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/**
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* Base class with common functions for transforming an ActivityPub Event object to a WordPress object.
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*
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* @package Event_Bridge_For_ActivityPub
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* @since 1.0.0
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* @license AGPL-3.0-or-later
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*/
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namespace Event_Bridge_For_ActivityPub\Activitypub\Transmogrifier;
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use Activitypub\Activity\Extended_Object\Event;
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use DateTime;
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use Exception;
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use WP_Error;
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use function Activitypub\sanitize_url;
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// Exit if accessed directly.
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defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
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/**
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* Base class with common functions for transforming an ActivityPub Event object to a WordPress object.
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*
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* @since 1.0.0
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*/
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abstract class Base {
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/**
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* The current GatherPress Event object.
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*
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* @var Event
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*/
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protected $activitypub_event;
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/**
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* Internal function to actually save the event.
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*/
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abstract protected function save_event();
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/**
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* Save the ActivityPub event object as GatherPress Event.
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*
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* @param array $activitypub_event The ActivityPub event as associative array.
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*/
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public function save( $activitypub_event ) {
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$activitypub_event = Event::init_from_array( $activitypub_event );
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if ( is_wp_error( $activitypub_event ) ) {
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return;
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}
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$this->activitypub_event = $activitypub_event;
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$this->save_event();
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}
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/**
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* Get post.
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*/
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protected function get_post_id_from_activitypub_id() {
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global $wpdb;
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return $wpdb->get_var(
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$wpdb->prepare(
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"SELECT ID FROM $wpdb->posts WHERE guid=%s",
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esc_sql( $this->activitypub_event->get_id() )
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)
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);
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}
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/**
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* Validate a time string if it is according to the ActivityPub specification.
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*
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* @param string $time_string The time string.
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* @return bool
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*/
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public static function is_valid_activitypub_time_string( $time_string ) {
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// Try to create a DateTime object from the input string.
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try {
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$date = new DateTime( $time_string );
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} catch ( Exception $e ) {
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// If parsing fails, it's not valid.
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return false;
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}
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// Ensure the timezone is correctly formatted (e.g., 'Z' or a valid offset).
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$timezone = $date->getTimezone();
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$formatted_timezone = $timezone->getName();
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// Return true only if the time string includes 'Z' or a valid timezone offset.
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$valid = 'Z' === $formatted_timezone || preg_match( '/^[+-]\d{2}:\d{2}$/ ', $formatted_timezone );
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return $valid;
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}
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/**
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* Get the image URL and alt-text of an ActivityPub object.
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*
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* @param array $data The ActivityPub object as ann associative array.
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* @return ?array Array containing the images URL and alt-text.
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*/
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private static function extract_image_alt_and_url( $data ) {
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$image = array(
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'url' => null,
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'alt' => null,
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);
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// Check whether it is already simple.
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if ( ! $data || is_string( $data ) ) {
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$image['url'] = $data;
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return $image;
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}
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if ( ! isset( $data['type'] ) ) {
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return $image;
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}
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if ( ! in_array( $data['type'], array( 'Document', 'Image' ), true ) ) {
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return $image;
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}
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if ( isset( $data['url'] ) ) {
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$image['url'] = $data['url'];
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} elseif ( isset( $data['id'] ) ) {
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$image['id'] = $data['id'];
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}
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if ( isset( $data['name'] ) ) {
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$image['alt'] = $data['name'];
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}
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return $image;
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}
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/**
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* Returns the URL of the featured image.
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*
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* @return array
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*/
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protected function get_featured_image() {
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$event = $this->activitypub_event;
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$image = $event->get_image();
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if ( $image ) {
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return self::extract_image_alt_and_url( $image );
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}
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$attachment = $event->get_attachment();
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if ( is_array( $attachment ) && ! empty( $attachment ) ) {
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$supported_types = array( 'Image', 'Document' );
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$match = null;
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foreach ( $attachment as $item ) {
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if ( in_array( $item['type'], $supported_types, true ) ) {
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$match = $item;
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break;
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}
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}
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$attachment = $match;
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}
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return self::extract_image_alt_and_url( $attachment );
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}
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/**
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* Given an image URL return an attachment ID. Image will be side-loaded into the media library if it doesn't exist.
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*
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* Forked from https://gist.github.com/kingkool68/a66d2df7835a8869625282faa78b489a.
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*
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* @param int $post_id The post ID where the image will be set as featured image.
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* @param string $url The image URL to maybe sideload.
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* @uses media_sideload_image
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* @return string|int|WP_Error
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*/
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protected static function maybe_sideload_image( $post_id, $url = '' ) {
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global $wpdb;
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// Include necessary WordPress file for media handling.
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if ( ! function_exists( 'media_sideload_image' ) ) {
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require_once ABSPATH . 'wp-admin/includes/media.php';
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require_once ABSPATH . 'wp-admin/includes/file.php';
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require_once ABSPATH . 'wp-admin/includes/image.php';
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}
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// Check to see if the URL has already been fetched, if so return the attachment ID.
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$attachment_id = $wpdb->get_var(
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$wpdb->prepare( "SELECT `post_id` FROM {$wpdb->postmeta} WHERE `meta_key` = '_source_url' AND `meta_value` = %s", sanitize_url( $url ) )
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);
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if ( ! empty( $attachment_id ) ) {
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return $attachment_id;
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}
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$attachment_id = $wpdb->get_var(
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$wpdb->prepare( "SELECT `ID` FROM {$wpdb->posts} WHERE guid=%s", $url )
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);
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if ( ! empty( $attachment_id ) ) {
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return $attachment_id;
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}
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// If the URL doesn't exist, sideload it to the media library.
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return media_sideload_image( sanitize_url( $url ), $post_id, sanitize_url( $url ), 'id' );
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}
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/**
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* Sideload an image_url set it as featured image and add the alt-text.
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*
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* @param int $post_id The post ID where the image will be set as featured image.
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* @param string $image_url The image URL.
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* @param string $alt_text The alt-text of the image.
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* @return int The attachment ID
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*/
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protected static function set_featured_image_with_alt( $post_id, $image_url, $alt_text = '' ) {
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// Maybe sideload the image or get the Attachment ID of an existing one.
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$image_id = self::maybe_sideload_image( $post_id, $image_url );
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if ( is_wp_error( $image_id ) ) {
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// Handle the error.
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return $image_id;
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}
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// Set the image as the featured image for the post.
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set_post_thumbnail( $post_id, $image_id );
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// Update the alt text.
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if ( ! empty( $alt_text ) ) {
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update_post_meta( $image_id, '_wp_attachment_image_alt', sanitize_text_field( $alt_text ) );
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}
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return $image_id; // Return the attachment ID for further use if needed.
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}
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/**
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* Convert a PostalAddress to a string.
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*
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* @link https://schema.org/PostalAddress
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*
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* @param array $postal_address The PostalAddress as an associative array.
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* @return string
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*/
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private static function postal_address_to_string( $postal_address ) {
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if ( ! is_array( $postal_address ) || 'PostalAddress' !== $postal_address['type'] ) {
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_doing_it_wrong(
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__METHOD__,
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'The parameter postal_address must be an associate array like schema.org/PostalAddress.',
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esc_html( EVENT_BRIDGE_FOR_ACTIVITYPUB_PLUGIN_VERSION )
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);
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}
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$address = array();
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$known_attributes = array(
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'streetAddress',
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'postalCode',
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'addressLocality',
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'addressState',
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'addressCountry',
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);
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foreach ( $known_attributes as $attribute ) {
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if ( isset( $postal_address[ $attribute ] ) && is_string( $postal_address[ $attribute ] ) ) {
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$address[] = $postal_address[ $attribute ];
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}
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}
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$address_string = implode( ' ,', $address );
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return $address_string;
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}
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/**
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* Convert an address to a string.
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*
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* @param mixed $address The address as an object, string or associative array.
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* @return string
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*/
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protected static function address_to_string( $address ) {
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if ( is_string( $address ) ) {
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return $address;
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}
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if ( is_object( $address ) ) {
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$address = (array) $address;
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}
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if ( ! is_array( $address ) || ! isset( $address['type'] ) ) {
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return '';
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}
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if ( 'PostalAddress' === $address['type'] ) {
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return self::postal_address_to_string( $address );
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}
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return '';
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}
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/**
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* Save the ActivityPub event object as GatherPress event.
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*/
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public function delete() {
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$post_id = $this->get_post_id_from_activitypub_id();
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if ( ! $post_id ) {
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return new WP_Error(
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'event_bridge_for_activitypub_remote_event_not_found',
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\__( 'Remote event not found in cache', 'event-bridge-for-activitypub' ),
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array( 'status' => 404 )
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);
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}
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$thumbnail_id = get_post_thumbnail_id( $post_id );
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if ( $thumbnail_id ) {
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wp_delete_attachment( $thumbnail_id, true );
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}
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wp_delete_post( $post_id, true );
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}
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/**
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* Return the number of revisions to keep.
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*
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* @return int The number of revisions to keep.
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*/
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public static function revisions_to_keep() {
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return 5;
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}
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/**
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* Returns the URL of the online event link.
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*
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* @return ?string
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*/
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protected function get_online_event_link_from_attachments() {
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$attachments = $this->activitypub_event->get_attachment();
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if ( ! is_array( $attachments ) || empty( $attachments ) ) {
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return;
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}
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foreach ( $attachments as $attachment ) {
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if ( array_key_exists( 'type', $attachment ) && 'Link' === $attachment['type'] && isset( $attachment['href'] ) ) {
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return $attachment['href'];
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}
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}
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}
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}
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