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<?php |
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/** |
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* Undo handler file. |
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* |
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* @package Activitypub |
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*/ |
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|
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namespace Activitypub\Handler; |
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|
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use Activitypub\Collection\Inbox as Inbox_Collection; |
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|
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use function Activitypub\object_to_uri; |
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|
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/** |
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* Handle Undo requests. |
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*/ |
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class Undo { |
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/** |
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* Initialize the class, registering WordPress hooks. |
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*/ |
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public static function init() { |
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\add_action( 'activitypub_inbox_undo', array( self::class, 'handle_undo' ), 10, 2 ); |
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\add_action( 'activitypub_validate_object', array( self::class, 'validate_object' ), 10, 3 ); |
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} |
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|
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/** |
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* Handle "Unfollow" requests. |
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* |
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* @param array $activity The JSON "Undo" Activity. |
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* @param int|int[]|null $user_ids The user ID(s). |
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*/ |
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public static function handle_undo( $activity, $user_ids ) { |
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$success = false; |
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|
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/* |
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* Resolve the sender so Inbox::undo() can verify ownership. A genuinely absent actor |
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* maps to null (no ownership check, for programmatic callers), but an actor that is |
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* present yet unparseable must be rejected rather than skipping the check — passing |
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* null there would re-open the undo-by-id attack. |
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*/ |
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$actor = isset( $activity['actor'] ) ? object_to_uri( $activity['actor'] ) : null; |
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|
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if ( isset( $activity['actor'] ) && empty( $actor ) ) { |
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$result = new \WP_Error( |
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'activitypub_undo_invalid_actor', |
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\__( 'The Undo activity has an invalid actor.', 'activitypub' ), |
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array( 'status' => 400 ) |
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); |
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} else { |
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$result = Inbox_Collection::undo( object_to_uri( $activity['object'] ), $actor ); |
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} |
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|
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if ( $result && ! \is_wp_error( $result ) ) { |
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$success = true; |
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} |
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|
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/** |
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* Fires after an ActivityPub Undo activity has been handled. |
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* |
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* @param array $activity The ActivityPub activity data. |
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* @param int[] $user_ids The local user IDs. |
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* @param bool $success True on success, false on failure. |
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* @param \WP_Comment|string $result The target, based on the activity that is being undone. |
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*/ |
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\do_action( 'activitypub_handled_undo', $activity, (array) $user_ids, $success, $result ); |
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} |
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|
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/** |
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* Validate the object. |
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* |
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* @param bool $valid The validation state. |
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* @param string $param The object parameter. |
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* @param \WP_REST_Request $request The request object. |
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* |
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* @return bool The validation state: true if valid, false if not. |
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*/ |
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public static function validate_object( $valid, $param, $request ) { |
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$activity = $request->get_json_params(); |
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|
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if ( empty( $activity['type'] ) ) { |
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return false; |
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} |
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|
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if ( 'Undo' !== $activity['type'] ) { |
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return $valid; |
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} |
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|
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if ( ! isset( $activity['actor'], $activity['object'] ) ) { |
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return false; |
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} |
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|
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if ( ! \is_array( $activity['object'] ) && ! \is_string( $activity['object'] ) ) { |
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return false; |
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} |
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|
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if ( \is_array( $activity['object'] ) && ! isset( $activity['object']['id'] ) ) { |
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return false; |
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} |
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|
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return $valid; |
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} |
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} |
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|
