[stable14] Fix user creation using LDAP Plugin

apps/user_ldap/lib/Group_LDAP.php

@@ -1171,6 +1171,7 @@ public function addToGroup($uid, $gid) {
 		if ($this->groupPluginManager->implementsActions(GroupInterface::ADD_TO_GROUP)) {
 			if ($ret = $this->groupPluginManager->addToGroup($uid, $gid)) {
 				$this->access->connection->clearCache();
+				unset($this->cachedGroupMembers[$gid]);
 			}
 			return $ret;
 		}
@@ -1188,6 +1189,7 @@ public function removeFromGroup($uid, $gid) {
 		if ($this->groupPluginManager->implementsActions(GroupInterface::REMOVE_FROM_GROUP)) {
 			if ($ret = $this->groupPluginManager->removeFromGroup($uid, $gid)) {
 				$this->access->connection->clearCache();
+				unset($this->cachedGroupMembers[$gid]);
 			}
 			return $ret;
 		}

apps/user_ldap/lib/UserPluginManager.php

@@ -84,7 +84,7 @@ public function implementsActions($actions) {
 	 *
 	 * @param string $username The username of the user to create
 	 * @param string $password The password of the new user
-	 * @return bool
+	 * @return string | false The user DN if user creation was successful.
 	 * @throws \Exception
 	 */
 	public function createUser($username, $password) {

apps/user_ldap/lib/User_LDAP.php

@@ -613,11 +613,20 @@ public function getNewLDAPConnection($uid) {
 	 * create new user
 	 * @param string $username username of the new user
 	 * @param string $password password of the new user
-	 * @return bool was the user created?
+	 * @throws \UnexpectedValueException
+	 * @return bool
 	 */
 	public function createUser($username, $password) {
 		if ($this->userPluginManager->implementsActions(Backend::CREATE_USER)) {
-			return $this->userPluginManager->createUser($username, $password);
+			if ($dn = $this->userPluginManager->createUser($username, $password)) {
+				if (is_string($dn)) {
+					//updates user mapping
+					$this->access->dn2ocname($dn, $username, true);
+				} else {
+					throw new \UnexpectedValueException("LDAP Plugin: Method createUser changed to return the user DN instead of boolean.");
+				}
+			}
+			return (bool) $dn;
 		}
 		return false;
 	}

apps/user_ldap/tests/User_LDAPTest.php

@@ -1422,7 +1422,7 @@ public function testCreateUserWithPlugin() {
 			->with('uid','password')
 			->willReturn('result');
 
-		$this->assertEquals($this->backend->createUser('uid', 'password'),'result');
+		$this->assertEquals($this->backend->createUser('uid', 'password'),true);
 	}
 
 	public function testCreateUserFailing() {