diff --git a/CHANGELOG b/CHANGELOG
index f3f57e113..7955bf7f5 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -203,6 +203,7 @@
 --------------------------------------------------------------------------------
 - output path of parent folder in many document/folder lists
 - list affected documents when transfering processes to another user
+- check for quota and duplicate content in restapi
 
 --------------------------------------------------------------------------------
                      Changes in version 5.1.22
diff --git a/inc/inc.ClassUI.php b/inc/inc.ClassUI.php
index 2b601f65e..4114cb7f2 100644
--- a/inc/inc.ClassUI.php
+++ b/inc/inc.ClassUI.php
@@ -183,10 +183,12 @@ class UI extends UI_Default {
 	} /* }}} */
 
 	static function exitError($pagetitle, $error, $noexit=false, $plain=false) {
-		global $theme, $dms, $user;
+		global $theme, $dms, $user, $settings;
+		$accessop = new SeedDMS_AccessOperation($dms, null, $user, $settings);
 		$view = UI::factory($theme, 'ErrorDlg');
 		$view->setParam('dms', $dms);
 		$view->setParam('user', $user);
+		$view->setParam('accessobject', $accessop);
 		$view->setParam('pagetitle', $pagetitle);
 		$view->setParam('errormsg', $error);
 		$view->setParam('plain', $plain);
diff --git a/out/out.ErrorDlg.php b/out/out.ErrorDlg.php
index bbea7a3ec..6681f02c8 100644
--- a/out/out.ErrorDlg.php
+++ b/out/out.ErrorDlg.php
@@ -37,7 +37,10 @@ require_once("inc/inc.Authentication.php");
 $tmp = explode('.', basename($_SERVER['SCRIPT_FILENAME']));
 $view = UI::factory($theme, $tmp[1], array('dms'=>$dms, 'user'=>$user));
 
+$accessop = new SeedDMS_AccessOperation($dms, null, $user, $settings);
+
 if($view) {
+	$view->setParam('accessobject', $accessop);
 	$view($_GET);
 	exit;
 }
diff --git a/restapi/index.php b/restapi/index.php
index e402228c9..227631ec3 100644
--- a/restapi/index.php
+++ b/restapi/index.php
@@ -595,6 +595,13 @@ class RestapiController { /* {{{ */
             return $response->withJson(array('success'=>false, 'message'=>'No parent folder id given', 'data'=>''), 400);
         }
 
+				if($settings->_quota > 0) {
+					$remain = checkQuota($userobj);
+					if ($remain < 0) {
+            return $response->withJson(array('success'=>false, 'message'=>'Quota exceeded', 'data'=>''), 400);
+					}
+				}
+
         $mfolder = $dms->getFolder($args['id']);
         if($mfolder) {
             $uploadedFiles = $request->getUploadedFiles();
@@ -692,6 +699,7 @@ class RestapiController { /* {{{ */
     function updateDocument($request, $response, $args) { /* {{{ */
         $dms = $this->container->dms;
         $userobj = $this->container->userobj;
+        $settings = $this->container->config;
 
         if(!$userobj) {
             return $response->withJson(array('success'=>false, 'message'=>'Not logged in', 'data'=>''), 403);
@@ -701,6 +709,13 @@ class RestapiController { /* {{{ */
             return $response->withJson(array('success'=>false, 'message'=>'No document id given', 'data'=>''), 400);
         }
 
+				if($settings->_quota > 0) {
+					$remain = checkQuota($userobj);
+					if ($remain < 0) {
+            return $response->withJson(array('success'=>false, 'message'=>'Quota exceeded', 'data'=>''), 400);
+					}
+				}
+
         $document = $dms->getDocument($args['id']);
         if($document) {
             if ($document->getAccessMode($userobj, 'updateDocument') >= M_READWRITE) {
@@ -726,7 +741,13 @@ class RestapiController { /* {{{ */
                 $file_info = array_pop($uploadedFiles);
                 if ($origfilename == null)
                     $origfilename = $file_info->getClientFilename();
-                $temp = $file_info->file;
+								$temp = $file_info->file;
+
+								/* Check if the uploaded file is identical to last version */
+								$lc = $document->getLatestContent();
+								if($lc->getChecksum() == SeedDMS_Core_File::checksum($temp)) {
+									return $response->withJson(array('success'=>false, 'message'=>'Uploaded file identical to last version', 'data'=>''), 400);
+								}
                 $finfo = finfo_open(FILEINFO_MIME_TYPE);
                 $userfiletype = finfo_file($finfo, $temp);
                 $fileType = ".".pathinfo($origfilename, PATHINFO_EXTENSION);
@@ -762,7 +783,15 @@ class RestapiController { /* {{{ */
 
         if(!ctype_digit($args['id']) || $args['id'] == 0) {
             return $response->withJson(array('success'=>false, 'message'=>'No document id given', 'data'=>''), 400);
-        }
+				}
+
+				if($settings->_quota > 0) {
+					$remain = checkQuota($userobj);
+					if ($remain < 0) {
+            return $response->withJson(array('success'=>false, 'message'=>'Quota exceeded', 'data'=>''), 400);
+					}
+				}
+
         $mfolder = $dms->getFolder($args['id']);
         if($mfolder) {
             if ($mfolder->getAccessMode($userobj, 'addDocument') >= M_READWRITE) {
diff --git a/views/bootstrap/class.Settings.php b/views/bootstrap/class.Settings.php
index 1f0655d8f..4ddff2538 100644
--- a/views/bootstrap/class.Settings.php
+++ b/views/bootstrap/class.Settings.php
@@ -32,13 +32,13 @@
 class SeedDMS_View_Settings extends SeedDMS_Theme_Style {
 
 	protected function showPaneHeader($name, $title, $isactive) { /* {{{ */
-		echo '<li class="'.($isactive ? 'active' : '').'"><a data-target="#'.$name.'" data-toggle="tab">'.$title.'</a></li>'."\n";
+		echo '<li class="nav-item '.($isactive ? 'active' : '').'"><a class="nav-link '.($isactive ? 'active' : '').'" data-target="#'.$name.'" data-toggle="tab">'.$title.'</a></li>'."\n";
 	} /* }}} */
 
 	protected function showStartPaneContent($name, $isactive) { /* {{{ */
 		echo '<div class="tab-pane'.($isactive ? ' active' : '').'" id="'.$name.'">';
 		$this->contentContainerStart();
-		echo '<table class="table-condensed" style="table-layout: fixed;">';
+		echo '<table class="table-condensed table-sm" style="table-layout: fixed;">';
 		echo '<tr><td width="20%"></td><td width="80%"></td></tr>';
 	} /* }}} */
 
@@ -51,7 +51,7 @@ class SeedDMS_View_Settings extends SeedDMS_Theme_Style {
 	protected function getTextField($name, $value, $type='', $placeholder='') { /* {{{ */
 		$html = '';
 		if($type == 'textarea' || ($type != 'password' && strlen($value) > 80))
-			$html .= '<textarea class="input-xxlarge" name="'.$name.'">'.$value.'</textarea>';
+			$html .= '<textarea class="form-control input-xxlarge" name="'.$name.'">'.$value.'</textarea>';
 		else {
 			if(strlen($value) > 40)
 				$class = 'input-xxlarge';
@@ -63,7 +63,7 @@ class SeedDMS_View_Settings extends SeedDMS_Theme_Style {
 				$class = 'input-medium';
 			else
 				$class = 'input-small';
-			$html .= '<input '.($type=='password' ? 'type="password"' : 'type="text"').' class="'.$class.'" name="'.$name.'" value="'.$value.'" placeholder="'.$placeholder.'"/>';
+			$html .= '<input '.($type=='password' ? 'type="password"' : 'type="text"').' class="form-control '.$class.'" name="'.$name.'" value="'.$value.'" placeholder="'.$placeholder.'"/>';
 		}
 		return $html;
 	} /* }}} */
@@ -158,9 +158,9 @@ class SeedDMS_View_Settings extends SeedDMS_Theme_Style {
         <td><?= getMLText($title) ?>:</td>
 				<td>
 <?php if($multiple) { ?>
-					<select name="<?= $name ?>[]" multiple>
+					<select class="form-control" name="<?= $name ?>[]" multiple>
 <?php } else { ?>
-					<select name="<?= $name ?>">
+					<select class="form-control" name="<?= $name ?>">
 <?php }
 		foreach($values as $i=>$value) {
 			$optval = trim($isass ? $i : $value);