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<?php |
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/** |
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* Outbox 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\Outbox; |
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|
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use Activitypub\Collection\Actors; |
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use Activitypub\Collection\Outbox as Outbox_Collection; |
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use Activitypub\Moderation; |
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|
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use function Activitypub\object_to_uri; |
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use function Activitypub\unfollow; |
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|
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/** |
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* Handle outgoing Undo activities. |
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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_filter( 'activitypub_outbox_undo', array( self::class, 'handle_undo' ), 10, 2 ); |
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} |
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|
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/** |
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* Handle outgoing "Undo" activities from local actors. |
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* |
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* Resolves the referenced activity from the outbox and delegates |
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* to the appropriate collection method to reverse its side effects |
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* and create the Undo activity. |
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* |
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* @param array $data The activity data array. |
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* @param int $user_id The user ID. |
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* |
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* @return int|\WP_Error The undo outbox item ID, or WP_Error on failure. |
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*/ |
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public static function handle_undo( $data, $user_id = null ) { |
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$object = $data['object'] ?? ''; |
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$id = object_to_uri( $object ); |
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|
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if ( empty( $id ) ) { |
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/* |
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* The embedded object has no `id` — common for clients that |
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* inline the activity to undo. Mastodon and other major |
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* implementations match an id-less Undo→Follow on the inner |
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* Follow's target. Mirror that fallback here so spec-valid |
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* bodies don't bypass the local unfollow logic. |
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*/ |
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if ( \is_array( $object ) && 'Follow' === ( $object['type'] ?? '' ) ) { |
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$embedded_actor = object_to_uri( $object['actor'] ?? '' ); |
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$user_actor = Actors::get_by_id( $user_id ); |
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|
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if ( \is_wp_error( $user_actor ) || ! $embedded_actor || $embedded_actor !== $user_actor->get_id() ) { |
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return new \WP_Error( |
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'activitypub_forbidden', |
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\__( 'You can only undo your own activities.', 'activitypub' ), |
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array( 'status' => 403 ) |
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); |
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} |
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|
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$target = object_to_uri( $object['object'] ?? '' ); |
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|
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if ( $target ) { |
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return unfollow( $target, $user_id ); |
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} |
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} |
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|
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return $data; |
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} |
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|
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$outbox_item = Outbox_Collection::get_by_guid( $id ); |
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|
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if ( \is_wp_error( $outbox_item ) ) { |
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return $data; |
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} |
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|
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// Verify the user owns this outbox item (blog actor user_id === 0 can undo any). |
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if ( $user_id > 0 && (int) $outbox_item->post_author !== $user_id ) { |
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return new \WP_Error( |
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'activitypub_forbidden', |
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\__( 'You can only undo your own activities.', 'activitypub' ), |
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array( 'status' => 403 ) |
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); |
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} |
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|
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$activity_type = \get_post_meta( $outbox_item->ID, '_activitypub_activity_type', true ); |
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|
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switch ( $activity_type ) { |
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case 'Follow': |
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$stored = \json_decode( $outbox_item->post_content, true ); |
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$target = object_to_uri( $stored['object'] ?? '' ); |
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|
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if ( $target ) { |
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return unfollow( $target, $user_id ); |
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} |
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|
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return $data; |
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|
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case 'Block': |
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$stored = \json_decode( $outbox_item->post_content, true ); |
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$actor_uri = \is_array( $stored ) ? object_to_uri( $stored['object'] ?? '' ) : ''; |
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|
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if ( $actor_uri ) { |
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Moderation::remove_user_block( $user_id, Moderation::TYPE_ACTOR, $actor_uri ); |
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} |
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|
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return Outbox_Collection::undo( $outbox_item ); |
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|
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default: |
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return Outbox_Collection::undo( $outbox_item ); |
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} |
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} |
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} |
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|
