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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
<?php
/**
* PHP script to stream out an image thumbnail.
*
* @file
* @ingroup Media
*/
define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
require_once( './includes/WebStart.php' );
$wgTrivialMimeDetection = true; //don't use fancy mime detection, just check the file extension for jpg/gif/png.
require_once( "$IP/includes/StreamFile.php" );
wfThumbMain();
wfLogProfilingData();
//--------------------------------------------------------------------------
function wfThumbMain() {
wfProfileIn( __METHOD__ );
$headers = array();
// Get input parameters
if ( get_magic_quotes_gpc() ) {
$params = array_map( 'stripslashes', $_REQUEST );
} else {
$params = $_REQUEST;
}
$fileName = isset( $params['f'] ) ? $params['f'] : '';
unset( $params['f'] );
// Backwards compatibility parameters
if ( isset( $params['w'] ) ) {
$params['width'] = $params['w'];
unset( $params['w'] );
}
if ( isset( $params['p'] ) ) {
$params['page'] = $params['p'];
}
unset( $params['r'] );
// Is this a thumb of an archived file?
$isOld = (isset( $params['archived'] ) && $params['archived']);
unset( $params['archived'] );
// Some basic input validation
$fileName = strtr( $fileName, '\\/', '__' );
// Actually fetch the image. Method depends on whether it is archived or not.
if( $isOld ) {
// Format is <timestamp>!<name>
$bits = explode( '!', $fileName, 2 );
if( !isset($bits[1]) ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
wfProfileOut( __METHOD__ );
return;
}
$title = Title::makeTitleSafe( NS_FILE, $bits[1] );
if( is_null($title) ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
wfProfileOut( __METHOD__ );
return;
}
$img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName );
} else {
$img = wfLocalFile( $fileName );
}
// Check permissions if there are read restrictions
if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
if ( !$img->getTitle()->userCanRead() ) {
wfThumbError( 403, 'Access denied. You do not have permission to access ' .
'the source file.' );
wfProfileOut( __METHOD__ );
return;
}
$headers[] = 'Cache-Control: private';
$headers[] = 'Vary: Cookie';
}
if ( !$img ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
wfProfileOut( __METHOD__ );
return;
}
if ( !$img->exists() ) {
wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
wfProfileOut( __METHOD__ );
return;
}
$sourcePath = $img->getPath();
if ( $sourcePath === false ) {
wfThumbError( 500, 'The source file is not locally accessible.' );
wfProfileOut( __METHOD__ );
return;
}
// Check IMS against the source file
// This means that clients can keep a cached copy even after it has been deleted on the server
if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
// Fix IE brokenness
$imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
// Calculate time
wfSuppressWarnings();
$imsUnix = strtotime( $imsString );
$stat = stat( $sourcePath );
wfRestoreWarnings();
if ( $stat['mtime'] <= $imsUnix ) {
header( 'HTTP/1.1 304 Not Modified' );
wfProfileOut( __METHOD__ );
return;
}
}
// Stream the file if it exists already
try {
if ( false != ( $thumbName = $img->thumbName( $params ) ) ) {
$thumbPath = $img->getThumbPath( $thumbName );
if ( is_file( $thumbPath ) ) {
wfStreamFile( $thumbPath, $headers );
wfProfileOut( __METHOD__ );
return;
}
}
} catch ( MWException $e ) {
wfThumbError( 500, $e->getHTML() );
wfProfileOut( __METHOD__ );
return;
}
try {
$thumb = $img->transform( $params, File::RENDER_NOW );
} catch( Exception $ex ) {
// Tried to select a page on a non-paged file?
$thumb = false;
}
$errorMsg = false;
if ( !$thumb ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
} elseif ( $thumb->isError() ) {
$errorMsg = $thumb->getHtmlMsg();
} elseif ( !$thumb->getPath() ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
} elseif ( $thumb->getPath() == $img->getPath() ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'Image was not scaled, ' .
'is the requested width bigger than the source?' );
} else {
wfStreamFile( $thumb->getPath(), $headers );
}
if ( $errorMsg !== false ) {
wfThumbError( 500, $errorMsg );
}
wfProfileOut( __METHOD__ );
}
function wfThumbError( $status, $msg ) {
global $wgShowHostnames;
header( 'Cache-Control: no-cache' );
header( 'Content-Type: text/html; charset=utf-8' );
if ( $status == 404 ) {
header( 'HTTP/1.1 404 Not found' );
} elseif ( $status == 403 ) {
header( 'HTTP/1.1 403 Forbidden' );
header( 'Vary: Cookie' );
} else {
header( 'HTTP/1.1 500 Internal server error' );
}
if( $wgShowHostnames ) {
$url = htmlspecialchars( isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '' );
$hostname = htmlspecialchars( wfHostname() );
$debug = "<!-- $url -->\n<!-- $hostname -->\n";
} else {
$debug = "";
}
echo <<<EOT
<html><head><title>Error generating thumbnail</title></head>
<body>
<h1>Error generating thumbnail</h1>
<p>
$msg
</p>
$debug
</body>
</html>
EOT;
}
|
