e password.
		 *     @type int    $created   Unix timestamp of when the password was created.
		 *     @type null   $last_used Null.
		 *     @type null   $last_ip   Null.
		 * }
		 * @param string $new_password The generated application password in plain text.
		 * @param array  $args         {
		 *     Arguments used to create the application password.
		 *
		 *     @type string $name   The name of the application password.
		 *     @type string $app_id A UUID provided by the application to uniquely identify it.
		 * }
		 */
		do_action( 'wp_create_application_password', $user_id, $new_item, $new_password, $args );

		return array( $new_password, $new_item );
	}

	/**
	 * Gets a user's application passwords.
	 *
	 * @since 5.6.0
	 *
	 * @param int $user_id User ID.
	 * @return array {
	 *     The list of application passwords.
	 *
	 *     @type array ...$0 {
	 *         @type string      $uuid      The unique identifier for the application password.
	 *         @type string      $app_id    A UUID provided by the application to uniquely identify it.
	 *         @type string      $name      The name of the application password.
	 *         @type string      $password  A one-way hash of the password.
	 *         @type int         $created   Unix timestamp of when the password was created.
	 *         @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.
	 *         @type string|null $last_ip   The IP address the application password was last used by.
	 *     }
	 * }
	 */
	public static function get_user_application_passwords( $user_id ) {
		$passwords = get_user_meta( $user_id, static::USERMETA_KEY_APPLICATION_PASSWORDS, true );

		if ( ! is_array( $passwords ) ) {
			return array();
		}

		$save = false;

		foreach ( $passwords as $i => $password ) {
			if ( ! isset( $password['uuid'] ) ) {
				$passwords[ $i ]['uuid'] = wp_generate_uuid4();
				$save                    = true;
			}
		}

		if ( $save ) {
			static::set_user_application_passwords( $user_id, $passwords );
		}

		return $passwords;
	}

	/**
	 * Gets a user's application password with the given UUID.
	 *
	 * @since 5.6.0
	 *
	 * @param int    $user_id User ID.
	 * @param string $uuid    The password's UUID.
	 * @return array|null {
	 *     The application password if found, null otherwise.
	 *
	 *     @type string      $uuid      The unique identifier for the application password.
	 *     @type string      $app_id    A UUID provided by the application to uniquely identify it.
	 *     @type string      $name      The name of the application password.
	 *     @type string      $password  A one-way hash of the password.
	 *     @type int         $created   Unix timestamp of when the password was created.
	 *     @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.
	 *     @type string|null $last_ip   The IP address the application password was last used by.
	 * }
	 */
	public static function get_user_application_password( $user_id, $uuid ) {
		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $password ) {
			if ( $password['uuid'] === $uuid ) {
				return $password;
			}
		}

		return null;
	}

	/**
	 * Checks if an application password with the given name exists for this user.
	 *
	 * @since 5.7.0
	 *
	 * @param int    $user_id User ID.
	 * @param string $name    Application name.
	 * @return bool Whether the provided application name exists.
	 */
	public static function application_name_exists_for_user( $user_id, $name ) {
		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $password ) {
			if ( strtolower( $password['name'] ) === strtolower( $name ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Updates an application password.
	 *
	 * @since 5.6.0
	 *
	 * @param int    $user_id User ID.
	 * @param string $uuid    The password's UUID.
	 * @param array  $update  {
	 *     Information about the application password to update.
	 *
	 *     @type string      $uuid      The unique identifier for the application password.
	 *     @type string      $app_id    A UUID provided by the application to uniquely identify it.
	 *     @type string      $name      The name of the application password.
	 *     @type string      $password  A one-way hash of the password.
	 *     @type int         $created   Unix timestamp of when the password was created.
	 *     @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.
	 *     @type string|null $last_ip   The IP address the application password was last used by.
	 * }
	 * @return true|WP_Error True if successful, otherwise a WP_Error instance is returned on error.
	 */
	public static function update_application_password( $user_id, $uuid, $update = array() ) {
		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as &$item ) {
			if ( $item['uuid'] !== $uuid ) {
				continue;
			}

			if ( ! empty( $update['name'] ) ) {
				$update['name'] = sanitize_text_field( $update['name'] );
			}

			$save = false;

			if ( ! empty( $update['name'] ) && $item['name'] !== $update['name'] ) {
				$item['name'] = $update['name'];
				$save         = true;
			}

			if ( $save ) {
				$saved = static::set_user_application_passwords( $user_id, $passwords );

				if ( ! $saved ) {
					return new WP_Error( 'db_error', __( 'Could not save application password.' ) );
				}
			}

			/**
			 * Fires when an application password is updated.
			 *
			 * @since 5.6.0
			 *
			 * @param int   $user_id The user ID.
			 * @param array $item    {
			 *     The updated application password details.
			 *
			 *     @type string      $uuid      The unique identifier for the application password.
			 *     @type string      $app_id    A UUID provided by the application to uniquely identify it.
			 *     @type string      $name      The name of the application password.
			 *     @type string      $password  A one-way hash of the password.
			 *     @type int         $created   Unix timestamp of when the password was created.
			 *     @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.
			 *     @type string|null $last_ip   The IP address the application password was last used by.
			 * }
			 * @param array $update  The information to update.
			 */
			do_action( 'wp_update_application_password', $user_id, $item, $update );

			return true;
		}

		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );
	}

	/**
	 * Records that an application password has been used.
	 *
	 * @since 5.6.0
	 *
	 * @param int    $user_id User ID.
	 * @param string $uuid    The password's UUID.
	 * @return true|WP_Error True if the usage was recorded, a WP_Error if an error occurs.
	 */
	public static function record_application_password_usage( $user_id, $uuid ) {
		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as &$password ) {
			if ( $password['uuid'] !== $uuid ) {
				continue;
			}

			// Only record activity once a day.
			if ( $password['last_used'] + DAY_IN_SECONDS > time() ) {
				return true;
			}

			$password['last_used'] = time();
			$password['last_ip']   = $_SERVER['REMOTE_ADDR'];

			$saved = static::set_user_application_passwords( $user_id, $passwords );

			if ( ! $saved ) {
				return new WP_Error( 'db_error', __( 'Could not save application password.' ) );
			}

			return true;
		}

		// Specified application password not found!
		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );
	}

	/**
	 * Deletes an application password.
	 *
	 * @since 5.6.0
	 *
	 * @param int    $user_id User ID.
	 * @param string $uuid    The password's UUID.
	 * @return true|WP_Error Whether the password was successfully found and deleted, a WP_Error otherwise.
	 */
	public static function delete_application_password( $user_id, $uuid ) {
		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $key => $item ) {
			if ( $item['uuid'] === $uuid ) {
				unset( $passwords[ $key ] );
				$saved = static::set_user_application_passwords( $user_id, $passwords );

				if ( ! $saved ) {
					return new WP_Error( 'db_error', __( 'Could not delete application password.' ) );
				}

				/**
				 * Fires when an application password is deleted.
				 *
				 * @since 5.6.0
				 *
				 * @param int   $user_id The user ID.
				 * @param array $item    The data about the application password.
				 */
				do_action( 'wp_delete_application_password', $user_id, $item );

				return true;
			}
		}

		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );
	}

	/**
	 * Deletes all application passwords for the given user.
	 *
	 * @since 5.6.0
	 *
	 * @param int $user_id User ID.
	 * @return int|WP_Error The number of passwords that were deleted or a WP_Error on failure.
	 */
	public static function delete_all_application_passwords( $user_id ) {
		$passwords = static::get_user_application_passwords( $user_id );

		if ( $passwords ) {
			$saved = static::set_user_application_passwords( $user_id, array() );

			if ( ! $saved ) {
				return new WP_Error( 'db_error', __( 'Could not delete application passwords.' ) );
			}

			foreach ( $passwords as $item ) {
				/** This action is documented in wp-includes/class-wp-application-passwords.php */
				do_action( 'wp_delete_application_password', $user_id, $item );
			}

			return count( $passwords );
		}

		return 0;
	}

	/**
	 * Sets a user's application passwords.
	 *
	 * @since 5.6.0
	 *
	 * @param int   $user_id   User ID.
	 * @param array $passwords {
	 *     The list of application passwords.
	 *
	 *     @type array ...$0 {
	 *         @type string      $uuid      The unique identifier for the application password.
	 *         @type string      $app_id    A UUID provided by the application to uniquely identify it.
	 *         @type string      $name      The name of the application password.
	 *         @type string      $password  A one-way hash of the password.
	 *         @type int         $created   Unix timestamp of when the password was created.
	 *         @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.
	 *         @type string|null $last_ip   The IP address the application password was last used by.
	 *     }
	 * }
	 * @return int|bool User meta ID if the key didn't exist (ie. this is the first time that an application password
	 *                  has been saved for the user), true on successful update, false on failure or if the value passed
	 *                  is the same as the one that is already in the database.
	 */
	protected static function set_user_application_passwords( $user_id, $passwords ) {
		return update_user_meta( $user_id, static::USERMETA_KEY_APPLICATION_PASSWORDS, $passwords );
	}

	/**
	 * Sanitizes and then splits a password into smaller chunks.
	 *
	 * @since 5.6.0
	 *
	 * @param string $raw_password The raw application password.
	 * @return string The chunked password.
	 */
	public static function chunk_password( $raw_password ) {
		$raw_password = preg_replace( '/[^a-z\d]/i', '', $raw_password );

		return trim( chunk_split( $raw_password, 4, ' ' ) );
	}
}
             => array(
						'force' => array(
							'type'        => 'boolean',
							'default'     => false,
							'description' => __( 'Required to be true, as revisions do not support trashing.' ),
						),
					),
				),
				'schema' => array( $this, 'get_public_item_schema' ),
			)
		);
	}

	/**
	 * Gets the parent post, if the template ID is valid.
	 *
	 * @since 6.4.0
	 *
	 * @param string $parent_template_id Supplied ID.
	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
	 */
	protected function get_parent( $parent_template_id ) {
		$template = get_block_template( $parent_template_id, $this->parent_post_type );

		if ( ! $template ) {
			return new WP_Error(
				'rest_post_invalid_parent',
				__( 'Invalid template parent ID.' ),
				array( 'status' => 404 )
			);
		}

		return get_post( $template->wp_id );
	}

	/**
	 * Prepares the item for the REST response.
	 *
	 * @since 6.4.0
	 *
	 * @param WP_Post         $item    Post revision object.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $item, $request ) {
		$template = _build_block_template_result_from_post( $item );
		$response = $this->parent_controller->prepare_item_for_response( $template, $request );

		$fields = $this->get_fields_for_response( $request );
		$data   = $response->get_data();

		if ( in_array( 'parent', $fields, true ) ) {
			$data['parent'] = (int) $item->post_parent;
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->filter_response_by_context( $data, $context );

		// Wrap the data in a response object.
		$response = new WP_REST_Response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $template );
			$response->add_links( $links );
		}

		return $response;
	}

	/**
	 * Checks if a given request has access to delete a revision.
	 *
	 * @since 6.4.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has access to delete the item, WP_Error object otherwise.
	 */
	public function delete_item_permissions_check( $request ) {
		$parent = $this->get_parent( $request['parent'] );
		if ( is_wp_error( $parent ) ) {
			return $parent;
		}

		if ( ! current_user_can( 'delete_post', $parent->ID ) ) {
			return new WP_Error(
				'rest_cannot_delete',
				__( 'Sorry, you are not allowed to delete revisions of this post.' ),
				array( 'status' => rest_authorization_required_code() )
			);
		}

		$revision = $this->get_revision( $request['id'] );
		if ( is_wp_error( $revision ) ) {
			return $revision;
		}

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return new WP_Error(
				'rest_cannot_delete',
				__( 'Sorry, you are not allowed to delete this revision.' ),
				array( 'status' => rest_authorization_required_code() )
			);
		}

		return true;
	}

	/**
	 * Prepares links for the request.
	 *
	 * @since 6.4.0
	 *
	 * @param WP_Block_Template $template Template.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $template ) {
		$links = array(
			'self'   => array(
				'href' => rest_url( sprintf( '/%s/%s/%s/%s/%d', $this->namespace, $this->parent_base, $template->id, $this->rest_base, $template->wp_id ) ),
			),
			'parent' => array(
				'href' => rest_url( sprintf( '/%s/%s/%s', $this->namespace, $this->parent_base, $template->id ) ),
			),
		);

		return $links;
	}

	/**
	 * Retrieves the item's schema, conforming to JSON Schema.
	 *
	 * @since 6.4.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = $this->parent_controller->get_item_schema();

		$schema['properties']['parent'] = array(
			'description' => __( 'The ID for the parent of the revision.' ),
			'type'        => 'integer',
			'context'     => array( 'view', 'edit', 'embed' ),
		);

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}
}