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<?php
/**
* Provide basic rate limiting functionality via WP Options API.
*
* Currently only provides a simple limit by delaying action by X seconds.
*
* Example usage:
*
* When an action runs, call set_rate_limit, e.g.:
*
* KKART_Rate_Limiter::set_rate_limit( "{$my_action_name}_{$user_id}", $delay );
*
* This sets a timestamp for future timestamp after which action can run again.
*
*
* Then before running the action again, check if the action is allowed to run, e.g.:
*
* if ( KKART_Rate_Limiter::retried_too_soon( "{$my_action_name}_{$user_id}" ) ) {
* add_notice( 'Sorry, too soon!' );
* }
*
* @package Kkart\Classes
* @version 3.9.0
* @since 3.9.0
*/
defined( 'ABSPATH' ) || exit;
/**
* Rate limit class.
*/
class KKART_Rate_Limiter {
/**
* Constructs Option name from action identifier.
*
* @param string $action_id Identifier of the action.
* @return string
*/
public static function storage_id( $action_id ) {
return 'kkart_rate_limit_' . $action_id;
}
/**
* Returns true if the action is not allowed to be run by the rate limiter yet, false otherwise.
*
* @param string $action_id Identifier of the action.
* @return bool
*/
public static function retried_too_soon( $action_id ) {
$next_try_allowed_at = get_option( self::storage_id( $action_id ) );
// No record of action running, so action is allowed to run.
if ( false === $next_try_allowed_at ) {
return false;
}
// Before the next run is allowed, retry forbidden.
if ( time() <= $next_try_allowed_at ) {
return true;
}
// After the next run is allowed, retry allowed.
return false;
}
/**
* Sets the rate limit delay in seconds for action with identifier $id.
*
* @param string $action_id Identifier of the action.
* @param int $delay Delay in seconds.
* @return bool True if the option setting was successful, false otherwise.
*/
public static function set_rate_limit( $action_id, $delay ) {
$option_name = self::storage_id( $action_id );
$next_try_allowed_at = time() + $delay;
return update_option( $option_name, $next_try_allowed_at );
}
}