Noptin_Page::email_click( $filter )

	public function email_click( $filter ) {

		if ( 'email_click' != $this->get_request_action() ) {
			return $filter;
		}

		$to = get_home_url();

		if ( isset( $_GET['to'] ) ) {
			$to = urldecode( $_GET['to'] );
		}

		if ( isset( $_GET['sid'] ) && isset( $_GET['cid'] ) ) {
			$subscriber_id = intval( $_GET['sid'] );
			$campaign_id   = intval( $_GET['cid'] );
			log_noptin_subscriber_campaign_click( $subscriber_id, $campaign_id, $to );
		}

		wp_redirect( $to );
		exit;

	}