Unify a bit the types of the fetcher

Now it will only accept a string as parameter instead of either a string
(DN) or a array (complete record).

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

apps/user_ldap/lib/Group_LDAP.php

@@ -56,7 +56,7 @@ class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, I
 
 	/** @var string[][] $cachedGroupMembers array of users with gid as key */
 	protected $cachedGroupMembers;
-	/** @var string[] $cachedGroupsByMember array of groups with uid as key */
+	/** @var string[][] $cachedGroupsByMember array of groups with uid as key */
 	protected $cachedGroupsByMember;
 	/** @var string[] $cachedNestedGroups array of groups with gid (DN) as key */
 	protected $cachedNestedGroups;
@@ -304,7 +304,7 @@ private function _groupMembers(string $dnGroup, ?array &$seen = null): array {
 			$rawMemberReads[$dnGroup] = $members;
 		}
 		if (is_array($members)) {
-			$fetcher = function ($memberDN) use (&$seen) {
+			$fetcher = function (string $memberDN) use (&$seen) {
 				return $this->_groupMembers($memberDN, $seen);
 			};
 			$allMembers = $this->walkNestedGroupsReturnDNs($dnGroup, $fetcher, $members, $seen);
@@ -342,7 +342,7 @@ private function _getGroupDNsFromMemberOf(string $dn): array {
 			return [];
 		}
 
-		$fetcher = function ($groupDN) {
+		$fetcher = function (string $groupDN) {
 			if (isset($this->cachedNestedGroups[$groupDN])) {
 				$nestedGroups = $this->cachedNestedGroups[$groupDN];
 			} else {
@@ -362,7 +362,7 @@ private function _getGroupDNsFromMemberOf(string $dn): array {
 	/**
 	 * @psalm-param list<array{dn: list<string>}|string> $list
 	 * @psalm-param array<string, int|array|string> $seen List of DN that have already been processed.
-	 * @param Closure(string) $fetcher
+	 * @psalm-param Closure(string) $fetcher
 	 */
 	private function processListFromWalkingNestedGroups(array &$list, array &$seen, string $dn, Closure $fetcher): void {
 		while ($record = array_shift($list)) {
@@ -375,7 +375,7 @@ private function processListFromWalkingNestedGroups(array &$list, array &$seen,
 			$cacheKey = 'walkNestedGroups_' . $recordDN;
 			$fetched = $this->access->connection->getFromCache($cacheKey);
 			if ($fetched === null) {
-				$fetched = $fetcher($record);
+				$fetched = $fetcher($recordDN);
 				$fetched = $this->access->connection->writeToCache($cacheKey, $fetched);
 			}
 			$list = array_merge($list, $fetched);
@@ -388,7 +388,7 @@ private function processListFromWalkingNestedGroups(array &$list, array &$seen,
 	/**
 	 * @psalm-param list<array{dn: list<string>}|string> $list
 	 * @psalm-param array<string, int|array|string> $seen List of DN that have already been processed.
-	 * @param Closure(string) $fetcher
+	 * @psalm-param Closure(string) $fetcher
 	 */
 	private function walkNestedGroupsReturnDNs(string $dn, Closure $fetcher, array $list, array &$seen = []): array {
 		$nesting = (int)$this->access->connection->ldapNestedGroups;
@@ -404,15 +404,15 @@ private function walkNestedGroupsReturnDNs(string $dn, Closure $fetcher, array $
 	/**
 	 * @psalm-param list<array{dn: list<string>}> $list
 	 * @psalm-param array<string, int|array|string> $seen List of DN that have already been processed.
+	 * @psalm-param Closure(string) $fetcher
 	 * @return array[] An array of records
-	 * @param Closure(string) $fetcher
 	 */
 	private function walkNestedGroupsReturnRecords(string $dn, Closure $fetcher, array $list, array &$seen = []): array {
 		$nesting = (int)$this->access->connection->ldapNestedGroups;
 
 		if ($nesting !== 1) {
 			// the keys are numeric, but should hold the DN
-			return array_reduce($list, function ($transformed, $record) use ($dn) {
+			return array_reduce($list, function (array $transformed, array $record) use ($dn) {
 				if ($record['dn'][0] != $dn) {
 					$transformed[$record['dn'][0]] = $record;
 				}
@@ -893,10 +893,7 @@ private function getGroupsByMember(string $dn, array &$seen = null): array {
 		$groups = $this->access->fetchListOfGroups($filter,
 			[strtolower($this->access->connection->ldapGroupMemberAssocAttr), $this->access->connection->ldapGroupDisplayName, 'dn']);
 		if (is_array($groups)) {
-			$fetcher = function ($dn) use (&$seen) {
-				if (is_array($dn) && isset($dn['dn'][0])) {
-					$dn = $dn['dn'][0];
-				}
+			$fetcher = function (string $dn) use (&$seen) {
 				return $this->getGroupsByMember($dn, $seen);
 			};
 
@@ -1215,7 +1212,7 @@ protected function filterValidGroups(array $listOfGroups): array {
 		$validGroupDNs = [];
 		foreach ($listOfGroups as $key => $item) {
 			$dn = is_string($item) ? $item : $item['dn'][0];
-			if(is_array($item) && !isset($item[$this->access->connection->ldapGroupDisplayName][0])) {
+			if (is_array($item) && !isset($item[$this->access->connection->ldapGroupDisplayName][0])) {
 				continue;
 			}
 			$name = $item[$this->access->connection->ldapGroupDisplayName][0] ?? null;