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