# activitypub/trunk/includes/constants.php

ActivityPub, version trunk. 118 lines.

- Page: https://pluginprobe.com/plugins/activitypub/trunk/code/includes/constants.php
- Raw: https://pluginprobe.com/plugins/activitypub/trunk/raw/includes/constants.php
- Modified: 2026-06-11T09:37:44+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/activitypub/trunk/code/includes/constants.php#L10-L20`.

```php
<?php
/**
 * Plugin constants.
 *
 * @package Activitypub
 */

// The following constants can be defined in your wp-config.php file to override the default values.

defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
defined( 'ACTIVITYPUB_EXCERPT_LENGTH' ) || define( 'ACTIVITYPUB_EXCERPT_LENGTH', 400 );
defined( 'ACTIVITYPUB_NOTE_LENGTH' ) || define( 'ACTIVITYPUB_NOTE_LENGTH', 500 );
defined( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS' ) || define( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS', 4 );
defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
defined( 'ACTIVITYPUB_USERNAME_REGEXP' ) || define( 'ACTIVITYPUB_USERNAME_REGEXP', '(?:([A-Za-z0-9\._-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))' );
defined( 'ACTIVITYPUB_URL_REGEXP' ) || define( 'ACTIVITYPUB_URL_REGEXP', '(https?:|www\.)\S+[\w\/]' );
defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "[ap_title type=\"html\"]\n\n[ap_content]\n\n[ap_hashtags]" );
defined( 'ACTIVITYPUB_DISABLE_REWRITES' ) || define( 'ACTIVITYPUB_DISABLE_REWRITES', false );
defined( 'ACTIVITYPUB_DISABLE_INCOMING_INTERACTIONS' ) || define( 'ACTIVITYPUB_DISABLE_INCOMING_INTERACTIONS', false );
defined( 'ACTIVITYPUB_DISABLE_OUTGOING_INTERACTIONS' ) || define( 'ACTIVITYPUB_DISABLE_OUTGOING_INTERACTIONS', false );
defined( 'ACTIVITYPUB_DEFAULT_OBJECT_TYPE' ) || define( 'ACTIVITYPUB_DEFAULT_OBJECT_TYPE', 'wordpress-post-format' );
defined( 'ACTIVITYPUB_OUTBOX_PROCESSING_BATCH_SIZE' ) || define( 'ACTIVITYPUB_OUTBOX_PROCESSING_BATCH_SIZE', 100 );
defined( 'ACTIVITYPUB_DISTRIBUTION_MODE' ) || define( 'ACTIVITYPUB_DISTRIBUTION_MODE', false );
// Backwards compatibility: map old ACTIVITYPUB_DISABLE_SIDELOADING to ACTIVITYPUB_DISABLE_REMOTE_CACHE.
if ( ! defined( 'ACTIVITYPUB_DISABLE_REMOTE_CACHE' ) && defined( 'ACTIVITYPUB_DISABLE_SIDELOADING' ) ) {
	define( 'ACTIVITYPUB_DISABLE_REMOTE_CACHE', ACTIVITYPUB_DISABLE_SIDELOADING );
}
defined( 'ACTIVITYPUB_DISABLE_REMOTE_CACHE' ) || define( 'ACTIVITYPUB_DISABLE_REMOTE_CACHE', false );

// The following constants are invariable and define values used throughout the plugin.

/*
 * Mastodon HTML sanitizer.
 *
 * @see https://docs.joinmastodon.org/spec/activitypub/#sanitization
 */
define(
	'ACTIVITYPUB_MASTODON_HTML_SANITIZER',
	array(
		'p'          => array(),
		'span'       => array( 'class' => true ),
		'br'         => array(),
		'a'          => array(
			'href'  => true,
			'rel'   => true,
			'class' => true,
		),
		'del'        => array(),
		'pre'        => array(),
		'code'       => array(),
		'em'         => array(),
		'strong'     => array(),
		'b'          => array(),
		'i'          => array(),
		'u'          => array(),
		'ul'         => array(),
		'ol'         => array(
			'start'    => true,
			'reversed' => true,
		),
		'li'         => array( 'value' => true ),
		'blockquote' => array(),
		'h1'         => array(),
		'h2'         => array(),
		'h3'         => array(),
		'h4'         => array(),
	)
);

define( 'ACTIVITYPUB_DATE_TIME_RFC3339', 'Y-m-d\TH:i:s\Z' );

// Define Actor-Modes for the plugin.
define( 'ACTIVITYPUB_ACTOR_MODE', 'actor' );
define( 'ACTIVITYPUB_BLOG_MODE', 'blog' );
define( 'ACTIVITYPUB_ACTOR_AND_BLOG_MODE', 'actor_blog' );

// Post visibility constants.
define( 'ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC', '' );
define( 'ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC', 'quiet_public' );
define( 'ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE', 'private' );
define( 'ACTIVITYPUB_CONTENT_VISIBILITY_LOCAL', 'local' );

// Object state constants (stored in activitypub_status meta).
define( 'ACTIVITYPUB_OBJECT_STATE_PENDING', 'pending' );
define( 'ACTIVITYPUB_OBJECT_STATE_FEDERATED', 'federated' );
define( 'ACTIVITYPUB_OBJECT_STATE_FAILED', 'failed' );
define( 'ACTIVITYPUB_OBJECT_STATE_DELETED', 'deleted' );

// Interaction policy constants.
define( 'ACTIVITYPUB_INTERACTION_POLICY_ANYONE', 'anyone' );
define( 'ACTIVITYPUB_INTERACTION_POLICY_FOLLOWERS', 'followers' );
define( 'ACTIVITYPUB_INTERACTION_POLICY_ME', 'me' );

// Identifiers that mark an Activity as Public.
define(
	'ACTIVITYPUB_PUBLIC_AUDIENCE_IDENTIFIERS',
	array(
		'https://www.w3.org/ns/activitystreams#Public',
		'as:Public',
		'Public', // For backwards compatibility.
	)
);

/*
 * HTTP error codes that indicate temporary/retriable failures.
 *
 * These errors suggest the server may recover quickly, so they get
 * shorter cache durations and qualify for automatic retries.
 *
 * @see https://github.com/tfredrich/RestApiTutorial.com/blob/master/content/advanced/responses/retries.md
 */
define( 'ACTIVITYPUB_RETRY_ERROR_CODES', array( 408, 429, 500, 502, 503, 504 ) );

// Default purge retention periods (in days).
define( 'ACTIVITYPUB_OUTBOX_PURGE_DAYS', 180 );
define( 'ACTIVITYPUB_INBOX_PURGE_DAYS', 180 );
define( 'ACTIVITYPUB_AP_POST_PURGE_DAYS', 30 );

```