fix checking quota in webdav, adding a sabredav plugin

apps/files/appinfo/remote.php

@@ -41,6 +41,7 @@ $server->setBaseUri($baseuri);
 $server->addPlugin(new Sabre_DAV_Auth_Plugin($authBackend, 'ownCloud'));
 $server->addPlugin(new Sabre_DAV_Locks_Plugin($lockBackend));
 $server->addPlugin(new Sabre_DAV_Browser_Plugin(false)); // Show something in the Browser, but no upload
+$server->addPlugin(new OC_Connector_Sabre_QuotaPlugin());
 
 // And off we go!
 $server->exec();

lib/connector/sabre/quotaplugin.php

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This plugin check user quota and deny creating files when they exceeds the quota.
+ * 
+ * @copyright Copyright (C) 2012 entreCables S.L. All rights reserved.
+ * @author Sergio Cambra
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class OC_Connector_Sabre_QuotaPlugin extends Sabre_DAV_ServerPlugin {
+
+	/**
+		* Reference to main server object 
+		* 
+		* @var Sabre_DAV_Server 
+		*/
+	private $server;
+
+	/**
+		* This initializes the plugin.
+		*
+		* This function is called by Sabre_DAV_Server, after
+		* addPlugin is called.
+		*
+		* This method should set up the requires event subscriptions.
+		* 
+		* @param Sabre_DAV_Server $server 
+		* @return void
+		*/
+	public function initialize(Sabre_DAV_Server $server) {
+
+			$this->server = $server;
+			$this->server->subscribeEvent('beforeWriteContent',array($this,'checkQuota'),10);
+			$this->server->subscribeEvent('beforeCreateFile',array($this,'checkQuota'),10);
+
+	}
+
+	/**
+		* This method is called before any HTTP method and forces users to be authenticated
+		* 
+		* @param string $method
+		* @throws Sabre_DAV_Exception
+		* @return bool 
+		*/
+	public function checkQuota($uri, $data = null) {
+		$expected = $this->server->httpRequest->getHeader('X-Expected-Entity-Length');
+		$length = $expected ? $expected : $this->server->httpRequest->getHeader('Content-Length');
+		if ($length) {
+			if(substr($uri,0,1)!=='/') $uri='/'.$uri;
+			list($parentUri,$newName) = Sabre_DAV_URLUtil::splitPath($uri);
+			if ($length > OC_Filesystem::free_space($parentUri)) {
+				throw new Sabre_DAV_Exception('Quota exceeded. File is too big.');
+			}
+		}
+		return true;
+	}
+}