diff --git a/controller/utilscontroller.php b/controller/utilscontroller.php
new file mode 100644
index 0000000..86c1f14
--- /dev/null
+++ b/controller/utilscontroller.php
@@ -0,0 +1,271 @@
+<?php
+/**
+ * ownCloud - gpxedit
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Julien Veyssier <eneiluj@gmx.fr>
+ * @copyright Julien Veyssier 2015
+ */
+
+namespace OCA\GpxEdit\Controller;
+
+use \OC_App;
+
+use OCP\IURLGenerator;
+use OCP\IConfig;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\RedirectResponse;
+
+use OCP\AppFramework\Http\ContentSecurityPolicy;
+
+use OCP\IRequest;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\Controller;
+
+/**
+ * Recursive find files from name pattern
+ */
+function globRecursive($path, $find, $recursive=True) {
+    $result = Array();
+    $dh = opendir($path);
+    while (($file = readdir($dh)) !== false) {
+        if (substr($file, 0, 1) === '.') continue;
+        $rfile = "{$path}/{$file}";
+        if (is_dir($rfile) and $recursive) {
+            foreach (globRecursive($rfile, $find) as $ret) {
+                array_push($result, $ret);
+            }
+        } else {
+            if (fnmatch($find, $file)){
+                array_push($result, $rfile);
+            }
+        }
+    }
+    closedir($dh);
+    return $result;
+}
+
+/*
+ * search into all directories in PATH environment variable
+ * to find a program and return it if found
+ */
+function getProgramPath($progname){
+    $path_ar = explode(':',getenv('path'));
+    foreach ($path_ar as $path){
+        $supposed_gpath = $path.'/'.$progname;
+        if (file_exists($supposed_gpath) and
+            is_executable($supposed_gpath)){
+            return $supposed_gpath;
+        }
+    }
+    return null;
+}
+
+function endswith($string, $test) {
+    $strlen = strlen($string);
+    $testlen = strlen($test);
+    if ($testlen > $strlen) return false;
+    return substr_compare($string, $test, $strlen - $testlen, $testlen) === 0;
+}
+
+class UtilsController extends Controller {
+
+
+    private $userId;
+    private $userfolder;
+    private $config;
+    private $userAbsoluteDataPath;
+    private $dbconnection;
+    private $dbtype;
+    private $appPath;
+
+    public function __construct($AppName, IRequest $request, $UserId, $userfolder, $config){
+        parent::__construct($AppName, $request);
+        $this->appPath = \OC_App::getAppPath('gpxedit');
+        $this->userId = $UserId;
+        $this->dbtype = $config->getSystemValue('dbtype');
+        if ($this->dbtype === 'pgsql'){
+            $this->dbdblquotes = '"';
+        }
+        else{
+            $this->dbdblquotes = '';
+        }
+        if ($UserId !== '' and $userfolder !== null){
+            // path of user files folder relative to DATA folder
+            $this->userfolder = $userfolder;
+            // IConfig object
+            $this->config = $config;
+            // absolute path to user files folder
+            $this->userAbsoluteDataPath =
+                $this->config->getSystemValue('datadirectory').
+                rtrim($this->userfolder->getFullPath(''), '/');
+
+            // make cache if it does not exist
+            $cachedirpath = $this->userAbsoluteDataPath.'/../cache';
+            if (! is_dir($cachedirpath)){
+                mkdir($cachedirpath);
+            }
+
+            $this->dbconnection = \OC::$server->getDatabaseConnection();
+        }
+    }
+
+    /**
+     * Add one tile server to the DB for current user
+     * @NoAdminRequired
+     * @NoCSRFRequired
+     */
+    public function addTileServer($servername, $serverurl) {
+        // first we check it does not already exist
+        $sqlts = 'SELECT servername FROM *PREFIX*gpxedit_tile_servers ';
+        $sqlts .= 'WHERE '.$this->dbdblquotes.'user'.$this->dbdblquotes.'=\''.$this->userId.'\' ';
+        $sqlts .= 'AND servername=\''.$servername.'\' ';
+        $req = $this->dbconnection->prepare($sqlts);
+        $req->execute();
+        $ts = null;
+        while ($row = $req->fetch()){
+            $ts = $row['servername'];
+            break;
+        }
+        $req->closeCursor();
+
+        // then if not, we insert it
+        if ($ts === null){
+            $sql = 'INSERT INTO *PREFIX*gpxedit_tile_servers';
+            $sql .= ' ('.$this->dbdblquotes.'user'.$this->dbdblquotes.', servername, url) ';
+            $sql .= 'VALUES (\''.$this->userId.'\',';
+            $sql .= '\''.$servername.'\',';
+            $sql .= '\''.$serverurl.'\');';
+            $req = $this->dbconnection->prepare($sql);
+            $req->execute();
+            $req->closeCursor();
+            $ok = 1;
+        }
+        else{
+            $ok = 0;
+        }
+
+        $response = new DataResponse(
+            [
+                'done'=>$ok
+            ]
+        );
+        $csp = new ContentSecurityPolicy();
+        $csp->addAllowedImageDomain('*')
+            ->addAllowedMediaDomain('*')
+            ->addAllowedConnectDomain('*');
+        $response->setContentSecurityPolicy($csp);
+        return $response;
+    }
+
+    /**
+     * Delete one tile server entry from DB for current user
+     * @NoAdminRequired
+     * @NoCSRFRequired
+     */
+    public function deleteTileServer($servername) {
+        $sqldel = 'DELETE FROM *PREFIX*gpxedit_tile_servers ';
+        $sqldel .= 'WHERE '.$this->dbdblquotes.'user'.$this->dbdblquotes.'=\''.$this->userId.'\' AND servername=\'';
+        $sqldel .= $servername.'\';';
+        //$sqldel .= 'WHERE user=\''.$this->userId.'\';';
+        $req = $this->dbconnection->prepare($sqldel);
+        $req->execute();
+        $req->closeCursor();
+
+        $response = new DataResponse(
+            [
+                'done'=>1
+            ]
+        );
+        $csp = new ContentSecurityPolicy();
+        $csp->addAllowedImageDomain('*')
+            ->addAllowedMediaDomain('*')
+            ->addAllowedConnectDomain('*');
+        $response->setContentSecurityPolicy($csp);
+        return $response;
+    }
+
+    /**
+     * Save options values to the DB for current user
+     * @NoAdminRequired
+     * @NoCSRFRequired
+     */
+    public function saveOptionsValues($optionsValues) {
+        // first we check if user already has options values in DB
+        $sqlts = 'SELECT jsonvalues FROM *PREFIX*gpxedit_options_values ';
+        $sqlts .= 'WHERE '.$this->dbdblquotes.'user'.$this->dbdblquotes.'=\''.$this->userId.'\' ';
+        $req = $this->dbconnection->prepare($sqlts);
+        $req->execute();
+        $check = null;
+        while ($row = $req->fetch()){
+            $check = $row['jsonvalues'];
+            break;
+        }
+        $req->closeCursor();
+
+        // if nothing is there, we insert
+        if ($check === null){
+            $sql = 'INSERT INTO *PREFIX*gpxedit_options_values';
+            $sql .= ' ('.$this->dbdblquotes.'user'.$this->dbdblquotes.', jsonvalues) ';
+            $sql .= 'VALUES (\''.$this->userId.'\',';
+            $sql .= '\''.$optionsValues.'\');';
+            $req = $this->dbconnection->prepare($sql);
+            $req->execute();
+            $req->closeCursor();
+        }
+        // else we update the values
+        else{
+            $sqlupd = 'UPDATE *PREFIX*gpxedit_options_values ';
+            $sqlupd .= 'SET jsonvalues=\''.$optionsValues.'\' ';
+            $sqlupd .= 'WHERE '.$this->dbdblquotes.'user'.$this->dbdblquotes.'=\''.$this->userId.'\' ; ';
+            $req = $this->dbconnection->prepare($sqlupd);
+            $req->execute();
+            $req->closeCursor();
+        }
+
+        $response = new DataResponse(
+            [
+                'done'=>true
+            ]
+        );
+        $csp = new ContentSecurityPolicy();
+        $csp->addAllowedImageDomain('*')
+            ->addAllowedMediaDomain('*')
+            ->addAllowedConnectDomain('*');
+        $response->setContentSecurityPolicy($csp);
+        return $response;
+    }
+
+    /**
+     * get options values to the DB for current user
+     * @NoAdminRequired
+     * @NoCSRFRequired
+     */
+    public function getOptionsValues($optionsValues) {
+        $sqlov = 'SELECT jsonvalues FROM *PREFIX*gpxedit_options_values ';
+        $sqlov .= 'WHERE '.$this->dbdblquotes.'user'.$this->dbdblquotes.'=\''.$this->userId.'\' ;';
+        $req = $this->dbconnection->prepare($sqlov);
+        $req->execute();
+        $ov = '{}';
+        while ($row = $req->fetch()){
+            $ov = $row["jsonvalues"];
+        }
+        $req->closeCursor();
+
+        $response = new DataResponse(
+            [
+                'values'=>$ov
+            ]
+        );
+        $csp = new ContentSecurityPolicy();
+        $csp->addAllowedImageDomain('*')
+            ->addAllowedMediaDomain('*')
+            ->addAllowedConnectDomain('*');
+        $response->setContentSecurityPolicy($csp);
+        return $response;
+    }
+
+}
diff --git a/js/gpxedit.js b/js/gpxedit.js
index ec0f6ae..c06e629 100644
--- a/js/gpxedit.js
+++ b/js/gpxedit.js
@@ -1122,8 +1122,9 @@ $(document).ready(function(){
     });
 
     // load a file if 'file' GET url parameter was given
-    var fileparam = decodeURI(getUrlParameter('file'));
-    if (fileparam){
+    var urlfileparam = getUrlParameter('file');
+    var fileparam = decodeURI(urlfileparam);
+    if (urlfileparam && urlfileparam !== undefined){
         loadAction(fileparam);
     }