wordpress-event-bridge-for-.../includes/activitypub/transformer/class-event.php

395 lines
11 KiB
PHP

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