1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
<?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 returns 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 value 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, filemtime, filectime, file_get_contents,
* getMimeType, hash, fopen, free_space and search
*/
class OC_FileProxy{
private static $proxies=array();
public static $enabled=true;
/**
* fallback function when a proxy operation is not implemented
* @param string $function the name of the proxy operation
* @param mixed $arguments
*
* this implements a dummy proxy for all operations
*/
public function __call($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;
}
/**
* @param string $operation
*/
public static function getProxies($operation = null) {
if ($operation === null) {
// return all
return self::$proxies;
}
$proxies=array();
foreach(self::$proxies as $proxy) {
if(method_exists($proxy, $operation)) {
$proxies[]=$proxy;
}
}
return $proxies;
}
/**
* @param string $operation
* @param string|boolean $filepath
*/
public static function runPreProxies($operation,&$filepath,&$filepath2=null) {
if(!self::$enabled) {
return true;
}
$operation='pre'.$operation;
$proxies=self::getProxies($operation);
foreach($proxies as $proxy) {
if(!is_null($filepath2)) {
if($proxy->$operation($filepath, $filepath2)===false) {
return false;
}
}else{
if($proxy->$operation($filepath)===false) {
return false;
}
}
}
return true;
}
/**
* @param string $operation
* @param string|boolean $path
*
* @return string
*/
public static function runPostProxies($operation, $path, $result) {
if(!self::$enabled) {
return $result;
}
$operation='post'.$operation;
$proxies=self::getProxies($operation);
foreach($proxies as $proxy) {
$result=$proxy->$operation($path, $result);
}
return $result;
}
public static function clearProxies() {
self::$proxies=array();
}
}
|
