Delete: Self-Destruct

.github/changelog/2046-from-description

@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Adds a self-destruct feature to remove a blog from the Fediverse by sending Delete activities to followers.

includes/class-cli.php

@@ -7,9 +7,11 @@
 
 namespace Activitypub;
 
+use Activitypub\Activity\Activity;
 use Activitypub\Collection\Actors;
 use Activitypub\Collection\Followers;
 use Activitypub\Collection\Outbox;
+use Activitypub\Scheduler;
 
 /**
  * WP-CLI commands.
@@ -23,15 +25,88 @@ class Cli extends \WP_CLI_Command {
 	 *
 	 * ## EXAMPLES
 	 *
-	 *     $ wp activitypub self-destruct
+	 *     $ wp activitypub self_destruct
 	 *
 	 * @param array|null $args       The arguments.
 	 * @param array|null $assoc_args The associative arguments.
 	 *
 	 * @return void
 	 */
-	public function self_destruct( $args, $assoc_args ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
-		\WP_CLI::warning( 'Self-Destructing is not implemented yet.' );
+	public function self_destruct( $args, $assoc_args = array() ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
+		// Display warning header.
+		\WP_CLI::line( \WP_CLI::colorize( '%R⚠️  DESTRUCTIVE OPERATION ⚠️%n' ) );
+		\WP_CLI::line( '' );
+
+		$question = 'You are about to delete your blog from the Fediverse. This action is IRREVERSIBLE and will:';
+		\WP_CLI::line( \WP_CLI::colorize( "%y{$question}%n" ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%y• Send Delete activities to all followers%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%y• Remove your blog from ActivityPub networks%n' ) );
+		\WP_CLI::line( '' );
+
+		\WP_CLI::confirm( 'Are you absolutely sure you want to continue?', $assoc_args );
+
+		// Get all users with ActivityPub capabilities.
+		$user_ids = \get_users(
+			array(
+				'fields'         => 'ID',
+				'capability__in' => array( 'activitypub' ),
+			)
+		);
+
+		if ( empty( $user_ids ) ) {
+			\WP_CLI::warning( 'No ActivityPub users found. Nothing to delete.' );
+			return;
+		}
+
+		// Show what will be processed.
+		$user_count = \count( $user_ids );
+		\WP_CLI::line( \WP_CLI::colorize( '%GStarting Fediverse deletion process...%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( "%BFound {$user_count} ActivityPub user(s) to process:%n" ) );
+		\WP_CLI::line( '' );
+
+		// Set the self-destruct flag.
+		\add_option( 'activitypub_self_destruct', true );
+
+		// Hook into outbox processing completion to notify when self-destruct is done.
+		\add_action( 'activitypub_outbox_processing_complete', array( Scheduler::class, 'check_self_destruct_completion' ), 10, 2 );
+
+		// Process each user with progress indication.
+		$processed = 0;
+		foreach ( $user_ids as $user_id ) {
+			$actor = Actors::get_by_id( $user_id );
+
+			if ( ! $actor ) {
+				\WP_CLI::line( \WP_CLI::colorize( "%R✗ Failed to load user ID: {$user_id}%n" ) );
+				continue;
+			}
+
+			$activity = new Activity();
+			$activity->set_actor( $actor->get_id() );
+			$activity->set_object( $actor->get_id() );
+			$activity->set_type( 'Delete' );
+
+			add_to_outbox( $activity, null, $user_id );
+			++$processed;
+
+			\WP_CLI::line( \WP_CLI::colorize( "%G✓%n [{$processed}/{$user_count}] Scheduled deletion for: %B{$actor->get_name()}%n" ) );
+		}
+
+		\WP_CLI::line( '' );
+
+		if ( 0 === $processed ) {
+			\WP_CLI::error( 'Failed to schedule any deletions. Please check your configuration.' );
+			return;
+		}
+
+		// Final success message with clear next steps.
+		\WP_CLI::success( "Successfully scheduled {$processed} user(s) for Fediverse deletion." );
+		\WP_CLI::line( '' );
+		\WP_CLI::line( \WP_CLI::colorize( '%Y📋 Next Steps:%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%Y• Keep the ActivityPub plugin active%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%Y• Delete activities will be sent automatically%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%Y• Process may take several minutes to complete%n' ) );
+		\WP_CLI::line( \WP_CLI::colorize( '%Y• The plugin will notify you when the process is done.%n' ) );
+		\WP_CLI::line( '' );
 	}
 
 	/**

includes/class-scheduler.php

@@ -73,6 +73,54 @@ public static function register_schedulers() {
 		do_action( 'activitypub_register_schedulers' );
 	}
 
+	/**
+	 * Check if self-destruct process is complete and notify.
+	 *
+	 * @param array  $inboxes        The inboxes.
+	 * @param string $json           The ActivityPub Activity JSON.
+	 */
+	public static function check_self_destruct_completion( $inboxes, $json ) {
+		// Only proceed if self-destruct is active.
+		if ( ! \get_option( 'activitypub_self_destruct', false ) ) {
+			return;
+		}
+
+		// Check if this is a Delete activity (part of self-destruct).
+		$activity_data = \json_decode( $json, true );
+		if ( ! isset( $activity_data['type'] ) || 'Delete' !== $activity_data['type'] ) {
+			return;
+		}
+
+		// Check if there are any more pending Delete activities for self-destruct.
+		$pending_deletes = \get_posts(
+			array(
+				'post_type'      => Outbox::POST_TYPE,
+				'post_status'    => 'pending',
+				'posts_per_page' => 1,
+				// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+				'meta_query'     => array(
+					array(
+						'key'     => '_activitypub_activity_type',
+						'value'   => 'Delete',
+						'compare' => '=',
+					),
+				),
+			)
+		);
+
+		// If no more pending Delete activities, self-destruct is complete.
+		if ( empty( $pending_deletes ) ) {
+			// Remove the self-destruct flag.
+			\delete_option( 'activitypub_self_destruct' );
+
+			// Remove the completion hook to avoid future notifications.
+			\remove_action( 'activitypub_outbox_processing_complete', array( self::class, 'check_self_destruct_completion' ), 10 );
+
+			// Add an admin notice for completion.
+			\add_option( 'activitypub_self_destruct_complete', \time() );
+		}
+	}
+
 	/**
 	 * Schedule all ActivityPub schedules.
 	 */

includes/wp-admin/class-admin.php

@@ -81,6 +81,24 @@ public static function admin_notices() {
 		if ( ! $current_screen ) {
 			return;
 		}
+
+		// Check for self-destruct completion notice.
+		$self_destruct_complete = \get_option( 'activitypub_self_destruct_complete' );
+		if ( $self_destruct_complete ) {
+			// Show the notice only once, then remove it.
+			\delete_option( 'activitypub_self_destruct_complete' );
+			?>
+			<div class="notice notice-success is-dismissible">
+				<p>
+					<strong><?php esc_html_e( 'ActivityPub Self-Destruct Complete!', 'activitypub' ); ?></strong>
+				</p>
+				<p>
+					<?php esc_html_e( 'All Delete activities have been successfully sent to the Fediverse. Your blog is no longer discoverable via ActivityPub and all followers have been notified of the deletion.', 'activitypub' ); ?>
+				</p>
+			</div>
+			<?php
+		}
+
 		if ( 'edit' === $current_screen->base && Extra_Fields::is_extra_fields_post_type( $current_screen->post_type ) ) {
 			?>
 			<div class="notice" style="margin: 0; background: none; border: none; box-shadow: none; padding: 15px 0 0 0; font-size: 14px;">