updated plugin ActivityPub version 8.3.0
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337
wp-content/plugins/activitypub/includes/functions-activity.php
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337
wp-content/plugins/activitypub/includes/functions-activity.php
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<?php
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/**
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* Activity functions.
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*
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* Functions for working with ActivityPub activities, objects, and actors.
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*
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* @package Activitypub
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*/
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namespace Activitypub;
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use Activitypub\Activity\Activity;
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use Activitypub\Activity\Actor;
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use Activitypub\Activity\Base_Object;
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/**
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* Returns the ActivityPub default JSON-context.
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*
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* @return array The activitypub context.
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*
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* @deprecated 7.6.0 Use the respective context function instead.
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*/
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function get_context() {
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\_deprecated_function( __FUNCTION__, '7.6.0', 'Use the respective context function instead.' );
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$context = Activity::JSON_LD_CONTEXT;
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/**
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* Filters the ActivityPub JSON-LD context.
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*
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* This filter allows developers to modify or extend the JSON-LD context used
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* in ActivityPub responses. The context defines the vocabulary and terms used
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* in the ActivityPub JSON objects.
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*
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* @param array $context The default ActivityPub JSON-LD context array.
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*/
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return \apply_filters( 'activitypub_json_context', $context );
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}
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/**
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* Extract recipient URLs from Activity object.
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*
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* @param array $data The Activity object as array.
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*
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* @return array The list of user URLs.
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*/
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function extract_recipients_from_activity( $data ) {
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$recipient_items = array();
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foreach ( array( 'to', 'bto', 'cc', 'bcc', 'audience' ) as $i ) {
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$recipient_items = \array_merge( $recipient_items, extract_recipients_from_activity_property( $i, $data ) );
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}
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return \array_unique( $recipient_items );
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}
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/**
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* Extract recipient URLs from a specific property of an Activity object.
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*
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* Checks the activity level first, then falls back to the object property,
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* and finally checks the instrument property (used by QuoteRequest activities).
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*
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* @param string $property The property to extract recipients from (e.g., 'to', 'cc').
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* @param array $data The Activity object as array.
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*
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* @return array The list of user URLs.
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*/
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function extract_recipients_from_activity_property( $property, $data ) {
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$recipients = array();
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if ( ! empty( $data[ $property ] ) ) {
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$recipients = $data[ $property ];
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} elseif ( ! empty( $data['object'][ $property ] ) ) {
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$recipients = $data['object'][ $property ];
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} elseif ( ! empty( $data['instrument'][ $property ] ) ) {
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// QuoteRequest activities have addressing in the instrument (the quoting Note).
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$recipients = $data['instrument'][ $property ];
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}
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$recipients = \array_map( '\Activitypub\object_to_uri', (array) $recipients );
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return \array_unique( \array_filter( $recipients ) );
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}
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/**
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* Determine the visibility of the activity based on its recipients.
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*
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* @param array $activity The activity data.
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*
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* @return string One of ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC,
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* ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC, or
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* ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE.
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*/
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function get_activity_visibility( $activity ) {
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// Set default visibility for specific activity types.
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if ( ! empty( $activity['type'] ) && in_array( $activity['type'], array( 'Accept', 'Delete', 'Follow', 'Reject', 'Undo' ), true ) ) {
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return ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE;
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}
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// Check 'to' field for public visibility.
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$to = extract_recipients_from_activity_property( 'to', $activity );
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if ( ! empty( array_intersect( $to, ACTIVITYPUB_PUBLIC_AUDIENCE_IDENTIFIERS ) ) ) {
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return ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC;
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}
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// Check 'cc' field for quiet public visibility.
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$cc = extract_recipients_from_activity_property( 'cc', $activity );
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if ( ! empty( array_intersect( $cc, ACTIVITYPUB_PUBLIC_AUDIENCE_IDENTIFIERS ) ) ) {
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return ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC;
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}
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return ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE;
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}
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/**
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* Check if passed Activity is Public.
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*
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* @see https://github.com/w3c/activitypub/issues/404#issuecomment-2926310561
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* @see https://www.w3.org/TR/activitypub/#delivery (Section 7.1, "Silent and private activities")
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*
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* @param Base_Object|array $data The Activity object as Base_Object or array.
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*
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* @return boolean True if public, false if not.
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*/
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function is_activity_public( $data ) {
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if ( $data instanceof Base_Object ) {
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$data = $data->to_array();
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}
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$recipients = extract_recipients_from_activity( $data );
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if ( empty( $recipients ) ) {
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return false;
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}
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return ! empty( array_intersect( $recipients, ACTIVITYPUB_PUBLIC_AUDIENCE_IDENTIFIERS ) );
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}
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/**
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* Check if passed Activity is a reply.
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*
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* @param array $data The Activity object as array.
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*
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* @return boolean True if a reply, false if not.
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*/
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function is_activity_reply( $data ) {
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return ! empty( $data['object']['inReplyTo'] );
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}
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/**
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* Check if passed Activity is a quote.
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*
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* Checks for quote properties: quote, quoteUrl, quoteUri, or _misskey_quote.
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*
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* @param array $data The Activity object as array.
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*
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* @return boolean True if a quote, false if not.
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*/
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function is_quote_activity( $data ) {
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return ! empty( $data['object']['quote'] ) ||
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! empty( $data['object']['quoteUrl'] ) ||
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! empty( $data['object']['quoteUri'] ) ||
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! empty( $data['object']['_misskey_quote'] );
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}
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/**
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* Get the URI of an ActivityPub object.
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*
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* @param array|string $data The ActivityPub object.
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*
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* @return string|null The URI of the ActivityPub object.
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*/
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function object_to_uri( $data ) {
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// Check whether it is already simple.
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if ( ! $data || is_string( $data ) ) {
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return $data;
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}
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if ( is_object( $data ) ) {
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$data = $data->to_array();
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}
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/*
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* Check if it is a list, then take first item.
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* This plugin does not support collections.
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*/
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if ( array_is_list( $data ) ) {
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$data = $data[0];
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}
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// Check if it is simplified now.
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if ( is_string( $data ) ) {
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return $data;
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}
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$type = 'Object';
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if ( isset( $data['type'] ) ) {
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$type = $data['type'];
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}
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// Return part of Object that makes most sense.
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switch ( $type ) {
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case 'Audio': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-audio.
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case 'Document': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-document.
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case 'Image': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-image.
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case 'Video': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-video.
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$data = object_to_uri( $data['url'] );
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break;
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case 'Link': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-link.
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case 'Mention': // See https://www.w3.org/TR/activitystreams-vocabulary/#dfn-mention.
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$data = $data['href'];
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break;
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case 'FeaturedItem': // See https://github.com/mastodon/featured_collections/pull/1.
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$data = object_to_uri( $data['featuredObject'] ?? null );
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break;
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default:
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if ( isset( $data['id'] ) ) {
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$data = $data['id'];
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} elseif ( isset( $data['url'] ) ) {
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$data = object_to_uri( $data['url'] );
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} elseif ( isset( $data['href'] ) ) {
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$data = $data['href'];
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} else {
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$data = null;
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}
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break;
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}
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return $data;
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}
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/**
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* Check if an `$data` is an Activity.
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*
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* @see https://www.w3.org/ns/activitystreams#activities
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*
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* @param array|object|string $data The data to check.
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*
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* @return boolean True if the `$data` is an Activity, false otherwise.
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*/
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function is_activity( $data ) {
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/**
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* Filters the activity types.
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*
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* @param array $types The activity types.
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*/
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$types = apply_filters( 'activitypub_activity_types', Activity::TYPES );
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return _is_type_of( $data, $types );
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}
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/**
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* Check if an `$data` is an Activity Object.
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*
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* @see https://www.w3.org/TR/activitystreams-vocabulary/#object-types
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*
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* @param array|object|string $data The data to check.
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*
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* @return boolean True if the `$data` is an Activity Object, false otherwise.
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*/
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function is_activity_object( $data ) {
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/**
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* Filters the activity object types.
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*
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* @param array $types The activity object types.
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*/
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$types = \apply_filters( 'activitypub_activity_object_types', Base_Object::TYPES );
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return _is_type_of( $data, $types );
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}
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/**
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* Check if an `$data` is an Actor.
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*
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* @see https://www.w3.org/ns/activitystreams#actor
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*
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* @param array|object|string $data The data to check.
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*
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* @return boolean True if the `$data` is an Actor, false otherwise.
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*/
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function is_actor( $data ) {
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/**
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* Filters the actor types.
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*
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* @param array $types The actor types.
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*/
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$types = apply_filters( 'activitypub_actor_types', Actor::TYPES );
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return _is_type_of( $data, $types );
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}
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/**
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* Check if an `$data` is a Collection.
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*
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* @see https://www.w3.org/ns/activitystreams#collections
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*
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* @param array|object|string $data The data to check.
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*
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* @return boolean True if the `$data` is a Collection, false otherwise.
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*/
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function is_collection( $data ) {
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/**
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* Filters the collection types.
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*
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* @param array $types The collection types.
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*/
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$types = apply_filters( 'activitypub_collection_types', array( 'Collection', 'OrderedCollection', 'CollectionPage', 'OrderedCollectionPage' ) );
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return _is_type_of( $data, $types );
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}
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/**
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* Private helper to check if $data is of a given type set.
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*
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* @param array|object|string $data The data to check.
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* @param array $types The types to check against.
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*
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* @return boolean True if $data is of one of the types, false otherwise.
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*/
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function _is_type_of( $data, $types ) {
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if ( is_string( $data ) ) {
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return in_array( $data, $types, true );
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}
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if ( is_array( $data ) && isset( $data['type'] ) ) {
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return in_array( $data['type'], $types, true );
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}
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if ( $data instanceof Base_Object ) {
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return in_array( $data->get_type(), $types, true );
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}
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return false;
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}
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