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<?php
/**
* Stripe Webhook Validation Handler
*
* @since 4.6.0
*
* @package LearnDash\Core
*/
namespace LearnDash\Core\Payments\Stripe;
use Learndash_Payment_Gateway;
use Learndash_Stripe_Gateway;
/**
* Stripe Webhook Validation Handler.
*
* @since 4.6.0
*/
class Webhook_Setup_Validator {
private const TRANSIENT_KEY = 'learndash_stripe_webhook_validation';
private const TRANSIENT_EXPIRATION = 60;
private const STATUS_IN_PROGRESS = 'in_progress';
private const STATUS_SUCCESS = 'success';
/**
* Ajax action name.
*
* @since 4.6.0
*
* @var string
*/
public static $ajax_action = 'learndash_validate_stripe_webhook';
/**
* Handles webhook validation ajax request.
*
* @since 4.6.0
*
* @return void
*/
public function handle_ajax_request(): void {
// Validate.
if ( ! is_admin() ) {
wp_send_json_error(
[
'message' => esc_html__( 'Invalid request.', 'learndash' ),
]
);
}
$nonce = isset( $_POST['nonce'] ) ? sanitize_text_field( wp_unslash( $_POST['nonce'] ) ) : '';
if ( ! wp_verify_nonce( $nonce, self::$ajax_action ) ) {
wp_send_json_error(
[
'message' => esc_html__( 'Invalid nonce.', 'learndash' ),
]
);
}
$call_index = isset( $_POST['call_index'] ) ? (int) sanitize_text_field( wp_unslash( $_POST['call_index'] ) ) : 0;
if ( $call_index < 1 ) {
wp_send_json_error(
[
'message' => esc_html__( 'Invalid call index.', 'learndash' ),
]
);
}
// Process.
// If it's the first call, we need to create and delete a fake coupon to test the webhook.
// A webhook processor will update the transient to mark the validation as successful.
if ( 1 === $call_index ) {
$stripe_gateway = Learndash_Payment_Gateway::get_active_payment_gateway_by_name( Learndash_Stripe_Gateway::get_name() );
if ( ! $stripe_gateway instanceof Learndash_Stripe_Gateway ) {
wp_send_json_error(
[
'message' => esc_html__( 'Stripe gateway is not active.', 'learndash' ),
]
);
}
$coupon_id = $stripe_gateway->create_fake_coupon_for_webhook_test();
$this->mark_in_progress( $coupon_id );
}
$status = self::get_status();
// Return response.
wp_send_json_success(
[
'success' => self::STATUS_SUCCESS === $status,
'fail' => '' === $status,
'progress' => self::STATUS_IN_PROGRESS === $status,
]
);
}
/**
* Deletes transient.
*
* @since 4.6.0
*
* @return void
*/
public function reset(): void {
delete_transient( self::TRANSIENT_KEY );
}
/**
* Sets transient to mark webhook validation in progress.
*
* @since 4.6.0
*
* @param string $secret_key Secret key.
*
* @return void
*/
public function mark_in_progress( string $secret_key ): void {
$data = [
'status' => self::STATUS_IN_PROGRESS,
'secret_key' => $secret_key,
];
// If in a minute it will still be in progress, it will be deleted. And the status will be empty.
set_transient( self::TRANSIENT_KEY, $data, self::TRANSIENT_EXPIRATION );
}
/**
* Sets transient to mark webhook validation in progress.
*
* @since 4.6.0
*
* @param string $secret_key Secret key.
*
* @return bool True if transient was set.
*/
public function mark_successful( string $secret_key ): bool {
if ( $this->get_secret_key() !== $secret_key ) {
return false;
}
$data = [
'status' => self::STATUS_SUCCESS,
'secret_key' => $secret_key,
];
return set_transient( self::TRANSIENT_KEY, $data, self::TRANSIENT_EXPIRATION );
}
/**
* Returns status or empty string if no transient.
*
* @since 4.6.0
*
* @return string
*/
protected function get_status(): string {
return $this->get_data()['status'] ?? '';
}
/**
* Returns secret_key or empty string if no transient.
*
* @since 4.6.0
*
* @return string
*/
protected function get_secret_key(): string {
return $this->get_data()['secret_key'] ?? '';
}
/**
* Returns data from transient or empty array if no transient.
*
* @since 4.6.0
*
* @return array<string, string>
*/
protected function get_data(): array {
$data = get_transient( self::TRANSIENT_KEY );
if ( ! is_array( $data ) || empty( $data ) ) {
return [];
}
return $data;
}
}