a bit of refactoring for oc_filesystem and implement user quota

1 files changed, 111 insertions, 0 deletions

diff --git a/lib/fileproxy.php b/lib/fileproxy.php
new file mode 100644
index 00000000000..549b7015a6a
--- /dev/null
+++ b/lib/fileproxy.php
@@ -0,0 +1,111 @@
+<?php
+
+/**
+* ownCloud
+*
+* @author Robin Appelman
+* @copyright 2011 Robin Appelman icewind1991@gmail.com
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+* License as published by the Free Software Foundation; either
+* version 3 of the License, or any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+*
+* You should have received a copy of the GNU Affero General Public
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*
+*/
+
+/**
+ * Class for manipulating filesystem requests
+ *
+ * Manipulation happens by using 2 kind of proxy operations, pre and post proxies
+ * that manipulate the filesystem call and the result of the call respectively
+ *
+ * A pre-proxy recieves the filepath as arugments (or 2 filespaths in case of operations like copy or move) and return a boolean
+ * If a pre-proxy returnes false the file operation will be canceled
+ * All filesystem operations have a pre-proxy
+ *
+ * A post-proxy recieves 2 arguments, the filepath and the result of the operation.
+ * The return calue of the post-proxy will be used as the new result of the operation
+ * The operations that have a post-proxy are
+ *      file_get_contents, is_file, is_dir, file_exists, stat, is_readable, is_writable, fileatime, filemtime, filectime, file_get_contents, getMimeType, hash, free_space and search
+ */
+
+class OC_FileProxy{
+	private static $proxies=array();
+	
+	/**
+	 * check if this proxy implments a specific proxy operation
+	 * @param string #proxy name of the proxy operation
+	 * @return bool
+	 */
+	public function provides($operation){
+		return method_exists($this,$operation);
+	}
+	
+	/**
+	 * fallback function when a proxy operation is not implement
+	 * @param string $function the name of the proxy operation
+	 * @param mixed
+	 *
+	 * this implements a dummy proxy for all operations
+	 */
+	public function __call($function,$arguments){
+		if(substr($function,0,3)=='pre'){
+			return true;
+		}else{
+			return $arguments[1];
+		}
+	}
+	
+	/**
+	 * register a proxy to be used
+	 * @param OC_FileProxy $proxy
+	 */
+	public static function register($proxy){
+		self::$proxies[]=$proxy;
+	}
+	
+	public static function getProxies($operation,$post){
+		$operation=(($post)?'post':'pre').$operation;
+		$proxies=array();
+		foreach(self::$proxies as $proxy){
+			if($proxy->provides($operation)){
+				$proxies[]=$proxy;
+			}
+		}
+		return $proxies;
+	}
+
+	public static function runPreProxies($operation,$filepath,$filepath2=null){
+		$proxies=self::getProxies($operation,false);
+		$operation='pre'.$operation;
+		foreach($proxies as $proxy){
+			if($filepath2){
+				if(!$proxy->$operation($filepath,$filepath2)){
+					return false;
+				}
+			}else{
+				if(!$proxy->$operation($filepath)){
+					return false;
+				}
+			}
+		}
+		return true;
+	}
+
+	public static function runPostProxies($operation,$path,$result){
+		$proxies=self::getProxies($operation,true);
+		$operation='post'.$operation;
+		foreach($proxies as $proxy){
+			$result=$proxy->$operation($path,$result);
+		}
+		return $result;
+	}
+}
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