Use email settings in DAV search

Signed-off-by: Louis Chemineau <louis@chmn.me>

apps/dav/lib/Connector/Sabre/Principal.php

@@ -266,6 +266,7 @@ protected function searchUserPrincipals(array $searchProperties, $test = 'allof'
 		$limitEnumerationPhone = $this->shareManager->limitEnumerationToPhone();
 		$allowEnumerationFullMatch = $this->shareManager->allowEnumerationFullMatch();
 		$ignoreSecondDisplayName = $this->shareManager->ignoreSecondDisplayName();
+		$matchEmail = $this->shareManager->matchEmail();
 
 		// If sharing is restricted to group members only,
 		// return only members that have groups in common
@@ -294,7 +295,7 @@ protected function searchUserPrincipals(array $searchProperties, $test = 'allof'
 			switch ($prop) {
 				case '{http://sabredav.org/ns}email-address':
 					if (!$allowEnumeration) {
-						if ($allowEnumerationFullMatch) {
+						if ($allowEnumerationFullMatch && $matchEmail) {
 							$users = $this->userManager->getByEmail($value);
 						} else {
 							$users = [];

apps/dav/tests/unit/Connector/Sabre/PrincipalTest.php

@@ -633,6 +633,10 @@ public function testSearchPrincipalWithEnumerationDisabledEmail() {
 			->method('allowEnumerationFullMatch')
 			->willReturn(true);
 
+		$this->shareManager->expects($this->once())
+			->method('matchEmail')
+			->willReturn(true);
+
 		$user2 = $this->createMock(IUser::class);
 		$user2->method('getUID')->willReturn('user2');
 		$user2->method('getDisplayName')->willReturn('User 2');