Use mimetype in thumbnail

ajax/thumbnail.php

@@ -21,12 +21,50 @@
  *
  */
 
-OCP\JSON::checkLoggedIn();
-OCP\JSON::checkAppEnabled('office');
+namespace OCA\Office;
+
+\OCP\JSON::checkLoggedIn();
+\OCP\JSON::checkAppEnabled('office');
 session_write_close();
 
 // TODO: short-circuit or fix the http 500 that happens on ajax/thumbnail.php
 // or just wait unit preview is merged to core ;)
 
 $file = $_GET['filepath'];
-//\OCP\Preview::show($file, 120, 120);
+if (method_exists('\OCP\Preview', 'show')){
+	\OCP\Preview::show($file, 120, 120);
+} else {
+	$mimetype = \OCP\Files::getMimeType($file);
+
+	// Replace slash and backslash with a minus
+	$icon = \str_replace(array('/', '\\') , '-', $mimetype);
+
+	$iconFile = '';
+	
+	// Is it a dir?
+	if ($mimetype === 'dir'){
+		$iconFile = \OC::$SERVERROOT . '/core/img/filetypes/folder.png';
+	}
+
+	// Icon exists?
+	if (!$iconFile && file_exists(\OC::$SERVERROOT . '/core/img/filetypes/' . $icon . '.png')){
+		$iconFile =  \OC::$SERVERROOT . '/core/img/filetypes/' . $icon . '.png';
+	}
+
+	// Try only the first part of the filetype
+	$mimePart = substr($icon, 0, strpos($icon, '-'));
+	if (!$iconFile && file_exists(\OC::$SERVERROOT . '/core/img/filetypes/' . $mimePart . '.png')){
+		$iconFile = \OC::$SERVERROOT . '/core/img/filetypes/' . $mimePart . '.png';
+	} 
+	
+	if (!$iconFile){
+		$iconFile = \OC::$SERVERROOT . '/core/img/filetypes/file.png';
+	}
+	
+	$iconData = base64_encode(file_get_contents($iconFile));
+	$image = new \OC_Image($iconData);
+	\OC_Util::obEnd();
+
+	echo $image->show();
+}
+