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<?php /** * Nonce abstraction for protecting forms against cross-site request forgery * * @package Caldera_Forms * @author Josh Pollock <Josh@CalderaWP.com> * @license GPL-2.0+ * @link * @copyright 2016 CalderaWP LLC */ class Caldera_Forms_Render_Nonce { /** * Nonce action prefix * * @since 1.5.0 * * @var string */ protected static $action = 'caldera_forms_front_'; /** * Create verification nonce * * @since 1.5.0 * * @param string $form_id Form ID * * @return string */ public static function create_verify_nonce( $form_id ){ return wp_create_nonce( self::nonce_action( $form_id ) ); } /** * Get name of nonce field * * @since 1.5.0 * * @return string */ public static function nonce_field_name( $form_id = false ){ $name = '_cf_verify'; if( $form_id ){ $name .= '_' . $form_id; } return $name; } /** * Verify the verification nonce * * @since 1.5.0 * * @param string $nonce Nonce to check * @param string $form_id Form ID * * @return false|int */ public static function verify_nonce( $nonce, $form_id ){ $valid = wp_verify_nonce( $nonce, self::nonce_action( $form_id ) ); if( ! $valid ){ /** * Fires when form submission is stopped by invalid security token * * @since 1.5.0 * * @param string $form_id ID of form that the */ do_action( 'caldera_forms_verification_token_failed', $form_id ); } return $valid; } /** * Create nonce field for use in form * * @since 1.5.0 * * @param $form_id * * @return string */ public static function nonce_field( $form_id, $from_esi = false ){ if ( ! $from_esi ) { if ( method_exists( 'LiteSpeed_Cache_API', 'esi_enabled' ) && LiteSpeed_Cache_API::esi_enabled() ) { if ( method_exists( 'LiteSpeed_Cache_API', 'v' ) && LiteSpeed_Cache_API::v( '1.2.4' ) ) { $params = array( 'form_id' => $form_id ) ; return LiteSpeed_Cache_API::esi_url( 'caldera_forms', 'Caldera Forms', $params ) ; } } } $nonce_field = '<input type="hidden" id="' . esc_attr( self::nonce_field_name( $form_id ) ) . '" name="' . esc_attr( self::nonce_field_name() ) . '" value="' . esc_attr( self::create_verify_nonce( $form_id ) ) . '" data-nonce-time="' . esc_attr( time() ) . '" />'; $nonce_field .= wp_referer_field( false ); return $nonce_field; } /** * Handle ESI request * */ public static function hook_esi( $params ) { $form_id = $params[ 'form_id' ] ; echo self::nonce_field( $form_id, true ) ; exit ; } /** * Create nonce action with form ID attatched * * @since 1.5.0 * * @param string $form_id Form ID * * @return string */ protected static function nonce_action( $form_id ){ return self::$action . $form_id; } }
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