/**
  * Read the user belonging to the incoming request and get his/her defaultDB.
  *
  * @return String $userdb
  */
 public static function readDbFromRequest()
 {
     $app = \Slim\Slim::getInstance();
     $oUser = new User();
     $request = $app->request();
     $public_key = $request->headers('X-PublicKey');
     //get User array from sent public key
     $user = $oUser->getUserByPublicKey($public_key);
     $userdb = $oUser->setDefaultDatabase($user['LoginID']);
     if ($userdb != NULL) {
         return $userdb;
     } else {
         $response["error"] = true;
         $response["defaultdb"] = "Could not select database of user.";
         LogHelper::write("Could not select database, check if the user's DefaultDB is available.", $user['username']);
         RequestHelper::echoResponse(500, $response);
         $app->stop();
     }
 }
use lib\LogHelper as Log;
// API Versioning
$app->group('/v1', function () use($app) {
    /**
     * GET route to export whole database to JSON
     *
     */
    $app->get('/database/export', function () use($app) {
        //create empty user
        $oUser = new User();
        //request header
        $request = $app->request();
        $public_key = $request->headers('X-PublicKey');
        //get User array from sent public key
        $user = $oUser->getUserByPublicKey($public_key);
        $userdb = $oUser->setDefaultDatabase($user['LoginID']);
        //get access level string of user
        $access_level = $oUser->getAccessLevel($user['LoginID']);
        //create new instance with the user specific database
        $tempTool = new DbExport($userdb);
        //read relevant table names with the user specific access level
        $export = $tempTool->readRelevantTables($access_level);
        $app->contentType('application/json;charset=utf-8');
        echo json_encode($export);
    });
    /**
     * GET route to export database meta information to JSON
     *
     */
    $app->get('/database/scheme', function () use($app) {
        $userdb = R::readDbFromRequest();