From d4a5e480ab9fb2337909f1be3c30048a8eb14d78 Mon Sep 17 00:00:00 2001
From: Carl Schwan <carl@carlschwan.eu>
Date: Tue, 11 Jan 2022 15:44:25 +0100
Subject: Fix idn emails not working in shares

Fix #30595

Signed-off-by: Carl Schwan <carl@carlschwan.eu>
---
 lib/private/Collaboration/Collaborators/MailPlugin.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/private/Collaboration/Collaborators/MailPlugin.php b/lib/private/Collaboration/Collaborators/MailPlugin.php
index 9e35aa828da..53a223b38dd 100644
--- a/lib/private/Collaboration/Collaborators/MailPlugin.php
+++ b/lib/private/Collaboration/Collaborators/MailPlugin.php
@@ -247,11 +247,14 @@ class MailPlugin implements ISearchPlugin {
 			$userResults['wide'] = array_slice($userResults['wide'], $offset, $limit);
 		}
 
+		[$username, $domain] = explode('@', $search);
+		$domain = idn_to_ascii($domain);
+		$searchIdn = $username . '@' . $domain;
 
-		if (!$searchResult->hasExactIdMatch($emailType) && filter_var($search, FILTER_VALIDATE_EMAIL)) {
+		if (!$searchResult->hasExactIdMatch($emailType) && filter_var($searchIdn, FILTER_VALIDATE_EMAIL)) {
 			$result['exact'][] = [
 				'label' => $search,
-				'uuid' => $search,
+				'uuid' => $searchIdn,
 				'value' => [
 					'shareType' => IShare::TYPE_EMAIL,
 					'shareWith' => $search,
-- 
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