[TASK] Retrieving siteroot

Classes/Controller/MailController.php

@@ -80,6 +80,8 @@ class MailController extends ActionController {
 		$selectedTemplate = NULL, $selectedExtension = NULL, $selectedLanguageLeft = NULL,
 		$selectedLanguageRight = NULL, $selectedExtensionKey = NULL, $selectedTemplateKey = NULL
 	) {
+		$siteRoot = BackendService::getSiteRoot((int) GeneralUtility::_GP('id'));
+
 		if (!($this->session instanceof PhpSession)) {
 			$this->session = $this->objectManager->get('SGalinski\SgMail\Session\PhpSession');
 			$this->session->setSessionKey('sg_mail_controller_session');

Classes/Service/BackendService.php

@@ -94,4 +94,23 @@ class BackendService {
 		$buttonBar->addButton($shortcutButton, ButtonBar::BUTTON_POSITION_RIGHT);
 		$docHeaderComponent->getButtonBar();
 	}
+
+	/**
+	 * Retrieves the next site root in the page hierarchy from the current page
+	 *
+	 * @param $currentPid
+	 * @return array
+	 */
+	public static function getSiteRoot($currentPid) {
+		$rootLine = BackendUtility::BEgetRootLine((int) GeneralUtility::_GP('id'));
+		$siteRoot = [];
+		foreach ($rootLine as $page) {
+			if ($page['is_siteroot'] === '1') {
+				$siteRoot = $page;
+				break;
+			}
+		}
+
+		return $siteRoot;
+	}
 }