Automattic / jetpack

		@list( $secret_1, $secret_2, $secret_eol, $user_id ) = explode( ':', $secrets );

		if ( empty( $secret_1 ) || empty( $secret_2 ) || empty( $secret_eol ) ) {

			Jetpack_Options::delete_option( $action );

			return $this->error( new Jetpack_Error( 'verify_secrets_incomplete', 'Verification secrets are incomplete', 400 ) );

		}

		if ( $secret_eol < time() ) {

			Jetpack_Options::delete_option( $action );

			} else if ( ! ctype_digit( $state ) ) {

				return $this->error( new Jetpack_Error( 'state_malformed', sprintf( 'The required "%s" parameter is malformed.', 'state' ), 400 ) );

			}

			if ( empty( $user_id ) || $user_id !== $state ) {

				Jetpack_Options::delete_option( $action );

				return $this->error( new Jetpack_Error( 'invalid_state', 'State is invalid', 400 ) );

			}

		}

		Jetpack_Options::delete_option( $action );