372 lines
10 KiB
PHP
372 lines
10 KiB
PHP
<?php
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/**
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* Replace the default ActivityPub Transformer
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*
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* @package Activitypub_Event_Extensions
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* @license AGPL-3.0-or-later
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*/
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namespace Activitypub_Event_Extensions\Activitypub\Transformer;
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// Exit if accessed directly.
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defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
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use Activitypub\Activity\Extended_Object\Event as Event_Object;
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use Activitypub\Activity\Extended_Object\Place;
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use Activitypub\Transformer\Post;
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use DateTime;
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/**
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* Base transformer for WordPress event post types to ActivityPub events.
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*
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* Everything that transforming several WordPress post types that represent events
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* have in common, as well as sane defaults for events should be defined here.
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*
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* BeforeFirstRelease:
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* [ ] remove link at the end of the content.
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* [ ] add organizer.
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* [ ] do add Cancelled reason in the content.
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*/
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abstract class Event extends Post {
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/**
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* The WordPress event taxonomy.
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*
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* @var string
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*/
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protected $wp_taxonomy;
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/**
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* Returns the ActivityStreams 2.0 Object-Type for an Event.
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*
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* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-event
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*
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* @return string The Event Object-Type.
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*/
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protected function get_type(): string {
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return 'Event';
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}
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/**
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* Get a sane default for whether comments are enabled.
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*/
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protected function get_comments_enabled(): ?bool {
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return comments_open( $this->wp_object );
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}
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/**
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* Set a hardcoded template for the content.
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*
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* This actually disabled templates for the content.
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* Maybe this independent templates for events will be added later.
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*/
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protected function get_post_content_template(): string {
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return '[ap_content]';
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}
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/**
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* Returns the title of the event.
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*
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* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-name
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*
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* @return string The name.
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*/
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protected function get_name(): string {
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return $this->wp_object->post_title;
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}
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/**
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* Extend the construction of the Post Transformer to also set the according taxonomy of the event post type.
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*
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* @param WP_Post $wp_object The WordPress post object (event).
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* @param string $wp_taxonomy The taxonomy slug of the event post type.
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*/
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public function __construct( $wp_object, $wp_taxonomy = 'category' ) {
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parent::__construct( $wp_object );
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$this->wp_taxonomy = $wp_taxonomy;
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}
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/**
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* Extract the join mode.
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*
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* Currently we don't handle joins, we always mark events as external.
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*
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* @return string
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*/
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public function get_join_mode(): ?string {
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return 'external';
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}
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/**
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* Extract the external participation url.
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*
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* Currently we don't handle joins, we always mark events as external.
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* We just link back to the events HTML representation on our WordPress site.
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*
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* @return ?string The external participation URL.
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*/
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public function get_external_participation_url(): ?string {
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return 'external' === $this->get_join_mode() ? $this->get_url() : null;
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}
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/**
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* Set the event category, via the mapping setting.
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*
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* @return ?string
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*/
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public function get_category(): ?string {
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if ( is_null( $this->wp_taxonomy ) ) {
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return null;
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}
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$current_category_mapping = \get_option( 'activitypub_event_extensions_event_category_mappings', array() );
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$terms = \get_the_terms( $this->wp_object, $this->wp_taxonomy );
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// Check if the event has a category set and if that category has a specific mapping return that one.
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if ( ! is_wp_error( $terms ) && $terms && array_key_exists( $terms[0]->slug, $current_category_mapping ) ) {
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return sanitize_text_field( $current_category_mapping[ $terms[0]->slug ] );
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} else {
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// Return the default event category.
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return sanitize_text_field( \get_option( 'activitypub_event_extensions_default_event_category', 'MEETING' ) );
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}
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}
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/**
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* Retrieves the excerpt text (may be HTML). Used for constructing the summary.
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*
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* @return ?string
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*/
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protected function retrieve_excerpt(): ?string {
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if ( $this->wp_object->post_excerpt ) {
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return $this->wp_object->post_excerpt;
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} else {
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return null;
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}
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}
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/**
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* Get the start time.
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*
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* This is mandatory and must be implemented in the final event transformer class.
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*/
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abstract protected function get_start_time(): string;
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/**
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* Get the end time.
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*
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* This is not mandatory and therefore just return null by default.
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*/
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protected function get_end_time(): ?string {
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return null;
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}
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/**
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* Get a default for the location.
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*
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* This should be overridden in the actual event transformer.
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*/
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protected function get_location(): ?Place {
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return null;
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}
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/**
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* Compose a human readable formatted start time.
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*/
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protected function format_start_time(): string {
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return $this->format_time( $this->get_start_time() );
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}
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/**
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* Compose a human readable formatted end time.
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*/
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protected function format_end_time(): string {
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return $this->format_time( $this->get_end_time() );
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}
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/**
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* Compose a human readable formatted time.
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*
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* @param ?string $time The time which needs to be formatted.
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*/
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private static function format_time( $time ) {
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if ( is_null( $time ) ) {
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return '';
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}
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$start_datetime = new DateTime( $time );
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$start_timestamp = $start_datetime->getTimestamp();
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$datetime_format = get_option( 'date_format' ) . ' ' . get_option( 'time_format' );
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return wp_date( $datetime_format, $start_timestamp );
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}
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/**
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* Format a human readable address.
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*/
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protected function format_address(): string {
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$location = $this->get_location();
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if ( is_null( $location ) ) {
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return '';
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}
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$address = $location->get_address();
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if ( ! $address ) {
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return $location->get_name();
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}
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if ( is_string( $address ) ) {
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return $address;
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}
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if ( ! is_array( $address ) ) {
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return '';
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}
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return isset( $address['locality'] ) ? $address['locality'] : '';
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}
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/**
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* Format the category using the translation.
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*/
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protected function format_categories(): string {
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if ( is_null( $this->wp_taxonomy ) ) {
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return '';
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}
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$categories = array();
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// Add the federated category string.
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require_once ACTIVITYPUB_EVENT_EXTENSIONS_PLUGIN_DIR . '/includes/event-categories.php';
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$federated_category = $this->get_category();
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if ( array_key_exists( $federated_category, ACTIVITYPUB_EVENT_EXTENSIONS_EVENT_CATEGORIES ) ) {
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$categories[] = ACTIVITYPUB_EVENT_EXTENSIONS_EVENT_CATEGORIES[ $federated_category ];
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}
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// Add all category terms.
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$terms = \get_the_terms( $this->wp_object, $this->wp_taxonomy );
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if ( $terms && ! is_wp_error( $terms ) ) {
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foreach ( $terms as $term ) {
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$categories[] = $term->name;
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}
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}
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if ( ! empty( $categories ) ) {
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return implode( ' · ', array_unique( $categories ) );
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}
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return '';
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}
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/**
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* Create a custom summary.
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*
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* It contains also the most important meta-information. The summary is often used when the
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* ActivityPub object type 'Event' is not supported, e.g. in Mastodon.
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*
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* @return string $summary The custom event summary.
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*/
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public function get_summary(): ?string {
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add_filter( 'activitypub_object_content_template', array( self::class, 'remove_ap_permalink_from_template' ), 2, 2 );
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$excerpt = $this->retrieve_excerpt();
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// BeforeFirstRelease: decide whether this should be a admin setting.
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$fallback_to_content = true;
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if ( is_null( $excerpt ) && $fallback_to_content ) {
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$excerpt = parent::get_content();
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}
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remove_filter( 'activitypub_object_content_template', array( self::class, 'remove_ap_permalink_from_template' ) );
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$category = $this->format_categories();
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$start_time = $this->format_start_time();
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$end_time = $this->format_end_time();
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$address = $this->format_address();
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$formatted_items = array();
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if ( ! empty( $category ) ) {
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$formatted_items[] = '🏷️ ' . __( 'Category', 'activitypub-event-extensions' ) . ': ' . $category;
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}
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if ( ! empty( $start_time ) ) {
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$formatted_items[] = '🗓️ ' . __( 'Start', 'activitypub-event-extensions' ) . ': ' . $start_time;
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}
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if ( ! empty( $end_time ) ) {
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$formatted_items[] = '⏳ ' . __( 'End', 'activitypub-event-extensions' ) . ': ' . $end_time;
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}
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if ( ! empty( $address ) ) {
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$formatted_items[] = '📍 ' . __( 'Address', 'activitypub-event-extensions' ) . ': ' . $address;
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}
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// Compose the summary based on the number of meta items.
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if ( count( $formatted_items ) > 1 ) {
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$summary = '<ul><li>' . implode( '</li><li>', $formatted_items ) . '</li></ul>';
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} elseif ( 1 === count( $formatted_items ) ) {
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$summary = $formatted_items[0]; // Just the one item without <ul><li>.
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} else {
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$summary = ''; // No items, so no output.
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}
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$summary .= $excerpt;
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return $summary;
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}
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/**
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* By default set the timezone of the WordPress site.
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*
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* This is likely to be overwritten by the actual transformer.
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*
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* @return string The timezone string of the site.
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*/
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public function get_timezone(): string {
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return wp_timezone_string();
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}
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/**
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* Remove the permalink shortcode from a WordPress template.
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*
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* This used for the summary template, because the summary usually gets,
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* used when converting a object, where the URL is usually appended anyway.
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*
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* @param string $template The template string.
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* @param WP_Post|WP_Comment $wp_object The wp_object which was used to select the template.
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*/
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public static function remove_ap_permalink_from_template( $template, $wp_object ) {
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// we could override the template here, to get out custom template from an option.
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if ( 'event' === $wp_object->post_type ) {
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$template = str_replace( '[ap_permalink]', '', $template );
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$template = str_replace( '[ap_permalink type="html"]', '', $template );
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}
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return $template;
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}
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/**
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* Generic function that converts an WP-Event object to an ActivityPub-Event object.
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*
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* @return Event_Object
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*/
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public function to_object(): Event_Object {
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$activitypub_object = new Event_Object();
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$activitypub_object = $this->transform_object_properties( $activitypub_object );
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// maybe move the following logic (till end of the function) into getter functions.
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$published = \strtotime( $this->wp_object->post_date_gmt );
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$activitypub_object->set_published( \gmdate( 'Y-m-d\TH:i:s\Z', $published ) );
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$updated = \strtotime( $this->wp_object->post_modified_gmt );
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if ( $updated > $published ) {
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$activitypub_object->set_updated( \gmdate( 'Y-m-d\TH:i:s\Z', $updated ) );
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}
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$activitypub_object->set_content_map(
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array(
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$this->get_locale() => $this->get_content(),
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)
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);
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$activitypub_object->set_to(
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array(
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'https://www.w3.org/ns/activitystreams#Public',
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$this->get_actor_object()->get_followers(), // this fails on my machine.
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)
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);
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return $activitypub_object;
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}
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}
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