Fix #952 better logging

Fix issue  creating a group with same id is not checked
Fix #937 Check that file is readable otherwise we cannot compute md5 on it.

Author: cdujeu

core/src/core/classes/class.AuthService.php

@@ -200,7 +200,7 @@ public static function checkBruteForceLogin(&$loginArray)
         $loginArray[$serverAddress] = $login;
         if ($login["count"] > 3) {
             if (AJXP_SERVER_DEBUG || ConfService::getCoreConf("DISABLE_BRUTE_FORCE_CHECK", "auth") === true) {
-                AJXP_Logger::debug("Warning: failed login 3 time for $login from address $serverAddress! Captcha is disabled.");
+                AJXP_Logger::debug("Warning: failed login 3 time from address $serverAddress, but ignored because captcha is disabled.");
                 return true;
             }
             return FALSE;
@@ -916,6 +916,10 @@ public static function listChildrenGroups($baseGroup = "/")
     public static function createGroup($baseGroup, $groupName, $groupLabel)
     {
         if(empty($groupName)) throw new Exception("Please provide a name for this new group!");
+        $currentGroups = self::listChildrenGroups($baseGroup);
+        if(array_key_exists("/".$groupName, $currentGroups)){
+            throw new Exception("Group with this name already exists, please pick another name!");
+        }
         if(empty($groupLabel)) $groupLabel = $groupName;
         ConfService::getConfStorageImpl()->createGroup(rtrim(self::filterBaseGroup($baseGroup), "/")."/".$groupName, $groupLabel);
     }

core/src/plugins/meta.filehasher/class.FileHasher.php

@@ -197,7 +197,7 @@ public function switchActions($actionName, $httpVars, $fileVars)
                     if(method_exists($this->accessDriver, "filesystemFileSize")){
                         $this->accessDriver->filesystemFileSize(null, $stat);
                     }
-                    if (!$stat) {
+                    if (!$stat || !is_readable($node->getUrl())) {
                         print '{}';
                     } else {
                         if($node->isLeaf()) {
@@ -227,8 +227,9 @@ public function switchActions($actionName, $httpVars, $fileVars)
                         if(method_exists($this->accessDriver, "filesystemFileSize")){
                             $this->accessDriver->filesystemFileSize(null, $stat);
                         }
-                        if(!$stat) $stat = '{}';
-                        else {
+                        if(!$stat || !is_readable($node->getUrl())) {
+                            $stat = '{}';
+                        } else {
                             if(!is_dir($node->getUrl())) $hash = $this->getFileHash($node);
                             else $hash = 'directory';
                             $stat[13] = $stat["hash"] = $hash;