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

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<?php
/**
* Replace the default ActivityPub Transformer
*
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* @package Activitypub_Event_Extensions
* @license AGPL-3.0-or-later
*/
namespace Activitypub_Event_Extensions\Activitypub\Transformer;
use DateTime;
use Activitypub\Activity\Extended_Object\Event as Event_Object;
use Activitypub\Activity\Extended_Object\Place;
use Activitypub\Transformer\Post;
/**
* Base transformer for WordPress event post types to ActivityPub events.
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*
* Everything that transforming several WordPress post types that represent events
* have in common, as well as sane defaults for events should be defined here.
*/
abstract class Event extends Post {
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/**
* The WordPress event taxonomy.
*
* @var string
*/
protected $wp_taxonomy;
/**
* Returns the User-URL of the Author of the Post.
*
* If `single_user` mode is enabled, the URL of the Blog-User is returned.
*
* @return string The User-URL.
*/
protected function get_actor(): ?string {
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return $this->get_attributed_to();
}
/**
* 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 );
}
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/**
* 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 {
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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 ) {
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() ? $this->get_url() : null;
}
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/**
* Set the event category, via the mapping setting.
*/
public function get_category(): ?string {
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$current_category_mapping = \get_option( 'activitypub_event_extensions_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 ] );
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} else {
// Return the default event category.
return sanitize_text_field( \get_option( 'activitypub_event_extensions_default_event_category', 'MEETING' ) );
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}
}
/**
* Retrieves the excerpt text (may be HTML). Used for constructing the summary.
*
* @return ?string
*/
protected function extract_excerpt(): ?string {
if ( $this->wp_object->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 protected 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;
}
/**
* Compose a human readable formatted start time.
*/
protected function format_time( $is_start_time = true ) {
$time = $is_start_time ? $this->get_start_time() : $this->get_end_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_category(): string {
require_once ACTIVITYPUB_EVENT_EXTENSIONS_PLUGIN_DIR . '/includes/event-categories.php';
$category = $this->get_category();
if ( array_key_exists( $category, ACTIVITYPUB_EVENT_EXTENSIONS_EVENT_CATEGORIES ) ) {
return ACTIVITYPUB_EVENT_EXTENSIONS_EVENT_CATEGORIES[ $category ];
} else {
return ACTIVITYPUB_EVENT_EXTENSIONS_EVENT_CATEGORIES['MEETING'];
}
}
/**
* 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 {
$excerpt = $this->extract_excerpt();
// BeforeFirstRelease: decide whether this should be a admin setting.
$fallback_to_content = true;
if ( is_null( $excerpt ) && $fallback_to_content ) {
$excerpt = $this->get_content();
}
$category = $this->format_category();
$start_time = $this->format_time();
$end_time = $this->format_time( false );
$address = $this->format_address();
$formatted_items = array();
if ( ! empty( $category ) ) {
$formatted_items[] = "🏷️ $category";
}
if ( ! empty( $start_time ) ) {
$formatted_items[] = "🗓️ . {$start_time}";
}
if ( ! empty( $end_time ) ) {
$formatted_items[] = "⏳ . {$end_time}";
}
if ( ! empty( $address ) ) {
$formatted_items[] = "📍 {$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;
}
/**
* 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 );
$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(),
)
);
return $activitypub_object;
}
}