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<?php
/**
* CartFlows Webhook Dispatcher.
*
* Core delivery engine. Schedules async webhook delivery via Action Scheduler.
*
* @package CartFlows
*/
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
if ( ! class_exists( 'Cartflows_Webhook_Dispatcher' ) ) {
/**
* Class Cartflows_Webhook_Dispatcher.
*/
class Cartflows_Webhook_Dispatcher {
/**
* Action Scheduler hook name.
*
* @var string
*/
const AS_HOOK = 'cartflows_process_webhook_delivery';
/**
* Retry backoff intervals in seconds.
*
* @var array
*/
const RETRY_INTERVALS = array( 60, 300, 1800, 3600, 7200 );
/**
* Member Variable
*
* @var instance
*/
private static $instance = null;
/**
* Initiator
*
* @return object initialized object of class.
*/
public static function get_instance() {
if ( is_null( self::$instance ) ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Constructor
*/
public function __construct() {
add_action( self::AS_HOOK, array( $this, 'process_webhook_delivery' ), 10, 4 );
}
/**
* Dispatch webhooks for an event.
*
* Finds all enabled webhooks for the event and schedules Action Scheduler jobs.
*
* @param string $event Event name.
* @param array $context Event context data.
* @return void
*/
public function dispatch( $event, $context = array() ) {
$manager = Cartflows_Webhook_Manager::get_instance();
$webhooks = $manager->get_webhooks_for_event( $event );
if ( empty( $webhooks ) ) {
wcf()->logger->log( 'Webhook dispatch: No webhooks found for event ' . $event );
return;
}
$object_id = isset( $context['order_id'] ) ? $context['order_id'] : ( isset( $context['step_id'] ) ? $context['step_id'] : 0 );
foreach ( $webhooks as $webhook ) {
// Deduplication check.
$dedup_key = 'wcf_wh_' . md5( $webhook['id'] . '_' . $event . '_' . $object_id );
if ( get_transient( $dedup_key ) ) {
wcf()->logger->log( 'Webhook dispatch: Skipping duplicate for webhook ' . $webhook['id'] . ' event ' . $event );
continue;
}
// Set dedup transient for 60 seconds.
set_transient( $dedup_key, 1, 60 );
$payload_builder = Cartflows_Webhook_Payload::get_instance();
$payload = $payload_builder->build( $event, $context, $webhook['id'] );
$body = wp_json_encode( $payload );
wcf()->logger->log( 'Webhook dispatch: Scheduling delivery for webhook ' . $webhook['id'] . ' event ' . $event );
// Schedule async delivery via Action Scheduler.
if ( function_exists( 'as_schedule_single_action' ) ) {
as_schedule_single_action(
time(),
self::AS_HOOK,
array(
'webhook_id' => $webhook['id'],
'body' => $body,
'event' => $event,
'retry_attempt' => 0,
),
'cartflows-webhooks'
);
}
}
}
/**
* Process a webhook delivery (called by Action Scheduler).
*
* @param string $webhook_id Webhook ID.
* @param string $body JSON payload body.
* @param string $event Event name.
* @param int $retry_attempt Current retry attempt.
* @return void
*/
public function process_webhook_delivery( $webhook_id, $body, $event, $retry_attempt = 0 ) {
$manager = Cartflows_Webhook_Manager::get_instance();
$webhook = $manager->get_webhook( $webhook_id );
if ( ! $webhook ) {
wcf()->logger->log( 'Webhook delivery: Webhook not found - ' . $webhook_id );
return;
}
if ( empty( $webhook['enabled'] ) ) {
wcf()->logger->log( 'Webhook delivery: Webhook disabled, skipping - ' . $webhook_id );
return;
}
$url = $webhook['url'];
$secret = isset( $webhook['secret'] ) ? $webhook['secret'] : '';
// Generate HMAC signature.
$signature = hash_hmac( 'sha256', $body, $secret );
$headers = array(
'Content-Type' => 'application/json',
'X-CartFlows-Webhook-Signature' => $signature,
'X-CartFlows-Event' => $event,
'X-CartFlows-Delivery-ID' => wp_generate_uuid4(),
'User-Agent' => 'CartFlows-Webhook/1.0',
);
wcf()->logger->log( 'Webhook delivery: Sending to ' . $url . ' for event ' . $event . ' (attempt ' . ( $retry_attempt + 1 ) . ')' );
$response = wp_safe_remote_post(
$url,
array(
'body' => $body,
'headers' => $headers,
'timeout' => 3,
'sslverify' => true,
)
);
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
wcf()->logger->log( 'Webhook delivery failed: ' . $error_message . ' - Webhook: ' . $webhook_id );
$manager->update_last_delivery(
$webhook_id,
array(
'status' => 'failed',
'triggered_at' => current_time( 'mysql' ),
'error' => $error_message,
)
);
$this->maybe_schedule_retry( $webhook_id, $body, $event, $retry_attempt, $webhook );
return;
}
$response_code = wp_remote_retrieve_response_code( $response );
if ( $response_code >= 200 && $response_code < 300 ) {
wcf()->logger->log( 'Webhook delivery success: HTTP ' . $response_code . ' - Webhook: ' . $webhook_id );
$manager->update_last_delivery(
$webhook_id,
array(
'status' => 'success',
'triggered_at' => current_time( 'mysql' ),
'error' => '',
)
);
} else {
$error_message = 'HTTP ' . $response_code . ': ' . wp_remote_retrieve_response_message( $response );
wcf()->logger->log( 'Webhook delivery failed: ' . $error_message . ' - Webhook: ' . $webhook_id );
$manager->update_last_delivery(
$webhook_id,
array(
'status' => 'failed',
'triggered_at' => current_time( 'mysql' ),
'error' => $error_message,
)
);
$this->maybe_schedule_retry( $webhook_id, $body, $event, $retry_attempt, $webhook );
}
}
/**
* Schedule a retry if within max retries.
*
* @param string $webhook_id Webhook ID.
* @param string $body JSON payload body.
* @param string $event Event name.
* @param int $retry_attempt Current retry attempt.
* @param array $webhook Webhook configuration.
* @return void
*/
private function maybe_schedule_retry( $webhook_id, $body, $event, $retry_attempt, $webhook ) {
$max_retries = isset( $webhook['max_retries'] ) ? absint( $webhook['max_retries'] ) : 3;
$next_attempt = $retry_attempt + 1;
if ( $next_attempt >= $max_retries ) {
wcf()->logger->log( 'Webhook delivery: Max retries reached (' . $max_retries . ') for webhook ' . $webhook_id . '. Giving up.' );
return;
}
$delay = isset( self::RETRY_INTERVALS[ $retry_attempt ] ) ? self::RETRY_INTERVALS[ $retry_attempt ] : 7200;
wcf()->logger->log( 'Webhook delivery: Scheduling retry ' . $next_attempt . ' in ' . $delay . 's for webhook ' . $webhook_id );
if ( function_exists( 'as_schedule_single_action' ) ) {
as_schedule_single_action(
time() + $delay,
self::AS_HOOK,
array(
'webhook_id' => $webhook_id,
'body' => $body,
'event' => $event,
'retry_attempt' => $next_attempt,
),
'cartflows-webhooks'
);
}
}
/**
* Send a test webhook synchronously.
*
* @param string $webhook_id Webhook ID.
* @return array Result with 'success', 'response_code', and 'error' keys.
*/
public function send_test( $webhook_id ) {
$manager = Cartflows_Webhook_Manager::get_instance();
$webhook = $manager->get_webhook( $webhook_id );
if ( ! $webhook ) {
return array(
'success' => false,
'response_code' => 0,
'error' => __( 'Webhook not found.', 'cartflows' ),
);
}
$payload_builder = Cartflows_Webhook_Payload::get_instance();
$payload = $payload_builder->build_test( $webhook_id );
$body = wp_json_encode( $payload );
$secret = isset( $webhook['secret'] ) ? $webhook['secret'] : '';
$signature = hash_hmac( 'sha256', $body, $secret );
$headers = array(
'Content-Type' => 'application/json',
'X-CartFlows-Webhook-Signature' => $signature,
'X-CartFlows-Event' => 'test',
'X-CartFlows-Delivery-ID' => wp_generate_uuid4(),
'User-Agent' => 'CartFlows-Webhook/1.0',
);
wcf()->logger->log( 'Webhook test: Sending test to ' . $webhook['url'] );
$response = wp_safe_remote_post(
$webhook['url'],
array(
'body' => $body,
'headers' => $headers,
'timeout' => 3,
'sslverify' => true,
)
);
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
wcf()->logger->log( 'Webhook test failed: ' . $error_message );
$manager->update_last_delivery(
$webhook_id,
array(
'status' => 'failed',
'triggered_at' => current_time( 'mysql' ),
'error' => $error_message,
)
);
return array(
'success' => false,
'response_code' => 0,
'error' => $error_message,
);
}
$response_code = wp_remote_retrieve_response_code( $response );
$manager->update_last_delivery(
$webhook_id,
array(
'status' => ( $response_code >= 200 && $response_code < 300 ) ? 'success' : 'failed',
'triggered_at' => current_time( 'mysql' ),
'error' => ( $response_code >= 200 && $response_code < 300 ) ? '' : 'HTTP ' . $response_code,
)
);
wcf()->logger->log( 'Webhook test result: HTTP ' . $response_code );
return array(
'success' => ( $response_code >= 200 && $response_code < 300 ),
'response_code' => $response_code,
'error' => ( $response_code >= 200 && $response_code < 300 ) ? '' : 'HTTP ' . $response_code,
);
}
}
}