[stable31] fix(LDAP): use displayname from DB, before reaching out to LDAP

apps/user_ldap/lib/Access.php

@@ -704,7 +704,7 @@ private function ldap2NextcloudNames(array $ldapObjects, bool $isUsers): array {
 						continue;
 					}
 					$sndName = $ldapObject[$sndAttribute][0] ?? '';
-					$this->cacheUserDisplayName($ncName, $nameByLDAP, $sndName);
+					$this->applyUserDisplayName($ncName, $nameByLDAP, $sndName);
 				} elseif ($nameByLDAP !== null) {
 					$this->cacheGroupDisplayName($ncName, $nameByLDAP);
 				}
@@ -752,20 +752,16 @@ public function cacheGroupExists(string $gid): void {
 		$this->connection->writeToCache('groupExists' . $gid, true);
 	}
 
-	/**
-	 * caches the user display name
-	 *
-	 * @param string $ocName the internal Nextcloud username
-	 * @param string $displayName the display name
-	 * @param string $displayName2 the second display name
-	 * @throws \Exception
-	 */
-	public function cacheUserDisplayName(string $ocName, string $displayName, string $displayName2 = ''): void {
-		$user = $this->userManager->get($ocName);
+	public function applyUserDisplayName(string $uid, string $displayName, string $displayName2 = ''): void {
+		$user = $this->userManager->get($uid);
 		if ($user === null) {
 			return;
 		}
-		$displayName = $user->composeAndStoreDisplayName($displayName, $displayName2);
+		$composedDisplayName = $user->composeAndStoreDisplayName($displayName, $displayName2);
+		$this->cacheUserDisplayName($uid, $composedDisplayName);
+	}
+
+	public function cacheUserDisplayName(string $ocName, string $displayName): void {
 		$cacheKeyTrunk = 'getDisplayName';
 		$this->connection->writeToCache($cacheKeyTrunk . $ocName, $displayName);
 	}

apps/user_ldap/lib/User/User.php

@@ -113,12 +113,8 @@ public function processAttributes(array $ldapEntry): void {
 			$displayName2 = (string)$ldapEntry[$attr][0];
 		}
 		if ($displayName !== '') {
-			$this->composeAndStoreDisplayName($displayName, $displayName2);
-			$this->access->cacheUserDisplayName(
-				$this->getUsername(),
-				$displayName,
-				$displayName2
-			);
+			$composedDisplayName = $this->composeAndStoreDisplayName($displayName, $displayName2);
+			$this->access->cacheUserDisplayName($this->getUsername(), $composedDisplayName);
 		}
 		unset($attr);
 
@@ -128,7 +124,8 @@ public function processAttributes(array $ldapEntry): void {
 		$attr = strtolower($this->connection->ldapEmailAttribute);
 		if (isset($ldapEntry[$attr])) {
 			$mailValue = 0;
-			for ($x = 0; $x < count($ldapEntry[$attr]); $x++) {
+			$emailValues = count($ldapEntry[$attr]);
+			for ($x = 0; $x < $emailValues; $x++) {
 				if (filter_var($ldapEntry[$attr][$x], FILTER_VALIDATE_EMAIL)) {
 					$mailValue = $x;
 					break;
@@ -451,6 +448,10 @@ public function composeAndStoreDisplayName(string $displayName, string $displayN
 		return $displayName;
 	}
 
+	public function fetchStoredDisplayName(): string {
+		return $this->config->getUserValue($this->uid, 'user_ldap', 'displayName', '');
+	}
+
 	/**
 	 * Stores the LDAP Username in the Database
 	 */

apps/user_ldap/lib/User_LDAP.php

@@ -409,26 +409,21 @@ public function getHome($uid) {
 		return $path;
 	}
 
-	/**
-	 * get display name of the user
-	 * @param string $uid user ID of the user
-	 * @return string|false display name
-	 */
-	public function getDisplayName($uid) {
-		if ($this->userPluginManager->implementsActions(Backend::GET_DISPLAYNAME)) {
-			return $this->userPluginManager->getDisplayName($uid);
-		}
-
-		if (!$this->userExists($uid)) {
-			return false;
+	private function getDisplayNameFromDatabase(string $uid): ?string {
+		$user = $this->access->userManager->get($uid);
+		if ($user instanceof User) {
+			$displayName = $user->fetchStoredDisplayName();
+			if ($displayName !== '') {
+				return $displayName;
+			}
 		}
-
-		$cacheKey = 'getDisplayName' . $uid;
-		if (!is_null($displayName = $this->access->connection->getFromCache($cacheKey))) {
-			return $displayName;
+		if ($user instanceof OfflineUser) {
+			return $user->getDisplayName();
 		}
+		return null;
+	}
 
-		//Check whether the display name is configured to have a 2nd feature
+	private function getDisplayNameFromLdap(string $uid): string {
 		$additionalAttribute = $this->access->connection->ldapUserDisplayName2;
 		$displayName2 = '';
 		if ($additionalAttribute !== '') {
@@ -450,16 +445,40 @@ public function getDisplayName($uid) {
 
 			$user = $this->access->userManager->get($uid);
 			if ($user instanceof User) {
-				$displayName = $user->composeAndStoreDisplayName($displayName, (string)$displayName2);
-				$this->access->connection->writeToCache($cacheKey, $displayName);
+				return $user->composeAndStoreDisplayName($displayName, (string)$displayName2);
 			}
 			if ($user instanceof OfflineUser) {
-				$displayName = $user->getDisplayName();
+				return $user->getDisplayName();
 			}
+		}
+
+		return '';
+	}
+
+	public function getDisplayName($uid): string {
+		if ($this->userPluginManager->implementsActions(Backend::GET_DISPLAYNAME)) {
+			return $this->userPluginManager->getDisplayName($uid);
+		}
+
+		if (!$this->userExists($uid)) {
+			return '';
+		}
+
+		$cacheKey = 'getDisplayName' . $uid;
+		if (!is_null($displayName = $this->access->connection->getFromCache($cacheKey))) {
 			return $displayName;
 		}
 
-		return null;
+		if ($displayName = $this->getDisplayNameFromDatabase($uid)) {
+			$this->access->connection->writeToCache($cacheKey, $displayName);
+			return $displayName;
+		}
+
+		if ($displayName = $this->getDisplayNameFromLdap($uid)) {
+			$this->access->connection->writeToCache($cacheKey, $displayName);
+		}
+
+		return $displayName;
 	}
 
 	/**
@@ -483,7 +502,8 @@ public function setDisplayName($uid, $displayName) {
 	 * @param string $search
 	 * @param int|null $limit
 	 * @param int|null $offset
-	 * @return array an array of all displayNames (value) and the corresponding uids (key)
+	 * @return array an array of all displayNames (value) and the corresponding
+	 *               uids (key)
 	 */
 	public function getDisplayNames($search = '', $limit = null, $offset = null) {
 		$cacheKey = 'getDisplayNames-' . $search . '-' . $limit . '-' . $offset;

build/psalm-baseline.xml

@@ -1101,16 +1101,10 @@
     </InvalidDocblock>
   </file>
   <file src="apps/user_ldap/lib/User_LDAP.php">
-    <ImplementedReturnTypeMismatch>
-      <code><![CDATA[string|false]]></code>
-    </ImplementedReturnTypeMismatch>
     <MoreSpecificImplementedParamType>
       <code><![CDATA[$limit]]></code>
       <code><![CDATA[$offset]]></code>
     </MoreSpecificImplementedParamType>
-    <NullableReturnStatement>
-      <code><![CDATA[null]]></code>
-    </NullableReturnStatement>
     <RedundantCondition>
       <code><![CDATA[$displayName && (count($displayName) > 0)]]></code>
       <code><![CDATA[is_string($dn)]]></code>