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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
<?php
/**
* Page view caching in the file system.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
*/
/**
* Page view caching in the file system.
* The only cacheable actions are "view" and "history". Also special pages
* will not be cached.
*
* @ingroup Cache
*/
class HTMLFileCache extends FileCacheBase {
/**
* Construct an ObjectFileCache from a Title and an action
* @param $title Title|string Title object or prefixed DB key string
* @param $action string
* @throws MWException
* @return HTMLFileCache
*/
public static function newFromTitle( $title, $action ) {
$cache = new self();
$allowedTypes = self::cacheablePageActions();
if ( !in_array( $action, $allowedTypes ) ) {
throw new MWException( "Invalid filecache type given." );
}
$cache->mKey = ( $title instanceof Title )
? $title->getPrefixedDBkey()
: (string)$title;
$cache->mType = (string)$action;
$cache->mExt = 'html';
return $cache;
}
/**
* Cacheable actions
* @return array
*/
protected static function cacheablePageActions() {
return array( 'view', 'history' );
}
/**
* Get the base file cache directory
* @return string
*/
protected function cacheDirectory() {
return $this->baseCacheDirectory(); // no subdir for b/c with old cache files
}
/**
* Get the cache type subdirectory (with the trailing slash) or the empty string
* Alter the type -> directory mapping to put action=view cache at the root.
*
* @return string
*/
protected function typeSubdirectory() {
if ( $this->mType === 'view' ) {
return ''; // b/c to not skip existing cache
} else {
return $this->mType . '/';
}
}
/**
* Check if pages can be cached for this request/user
* @param $context IContextSource
* @return bool
*/
public static function useFileCache( IContextSource $context ) {
global $wgUseFileCache, $wgShowIPinHeader, $wgDebugToolbar, $wgContLang;
if ( !$wgUseFileCache ) {
return false;
}
if ( $wgShowIPinHeader || $wgDebugToolbar ) {
wfDebug( "HTML file cache skipped. Either \$wgShowIPinHeader and/or \$wgDebugToolbar on\n" );
return false;
}
// Get all query values
$queryVals = $context->getRequest()->getValues();
foreach ( $queryVals as $query => $val ) {
if ( $query === 'title' || $query === 'curid' ) {
continue; // note: curid sets title
// Normal page view in query form can have action=view.
} elseif ( $query === 'action' && in_array( $val, self::cacheablePageActions() ) ) {
continue;
// Below are header setting params
} elseif ( $query === 'maxage' || $query === 'smaxage' ) {
continue;
}
return false;
}
$user = $context->getUser();
// Check for non-standard user language; this covers uselang,
// and extensions for auto-detecting user language.
$ulang = $context->getLanguage()->getCode();
$clang = $wgContLang->getCode();
// Check that there are no other sources of variation
return !$user->getId() && !$user->getNewtalk() && $ulang == $clang;
}
/**
* Read from cache to context output
* @param $context IContextSource
* @return void
*/
public function loadFromFileCache( IContextSource $context ) {
global $wgMimeType, $wgLanguageCode;
wfDebug( __METHOD__ . "()\n" );
$filename = $this->cachePath();
$context->getOutput()->sendCacheControl();
header( "Content-Type: $wgMimeType; charset=UTF-8" );
header( "Content-Language: $wgLanguageCode" );
if ( $this->useGzip() ) {
if ( wfClientAcceptsGzip() ) {
header( 'Content-Encoding: gzip' );
readfile( $filename );
} else {
/* Send uncompressed */
wfDebug( __METHOD__ . " uncompressing cache file and sending it\n" );
readgzfile( $filename );
}
} else {
readfile( $filename );
}
$context->getOutput()->disable(); // tell $wgOut that output is taken care of
}
/**
* Save this cache object with the given text.
* Use this as an ob_start() handler.
* @param $text string
* @return bool Whether $wgUseFileCache is enabled
*/
public function saveToFileCache( $text ) {
global $wgUseFileCache;
if ( !$wgUseFileCache || strlen( $text ) < 512 ) {
// Disabled or empty/broken output (OOM and PHP errors)
return $text;
}
wfDebug( __METHOD__ . "()\n", false );
$now = wfTimestampNow();
if ( $this->useGzip() ) {
$text = str_replace(
'</html>', '<!-- Cached/compressed ' . $now . " -->\n</html>", $text );
} else {
$text = str_replace(
'</html>', '<!-- Cached ' . $now . " -->\n</html>", $text );
}
// Store text to FS...
$compressed = $this->saveText( $text );
if ( $compressed === false ) {
return $text; // error
}
// gzip output to buffer as needed and set headers...
if ( $this->useGzip() ) {
// @todo Ugly wfClientAcceptsGzip() function - use context!
if ( wfClientAcceptsGzip() ) {
header( 'Content-Encoding: gzip' );
return $compressed;
} else {
return $text;
}
} else {
return $text;
}
}
/**
* Clear the file caches for a page for all actions
* @param $title Title
* @return bool Whether $wgUseFileCache is enabled
*/
public static function clearFileCache( Title $title ) {
global $wgUseFileCache;
if ( !$wgUseFileCache ) {
return false;
}
foreach ( self::cacheablePageActions() as $type ) {
$fc = self::newFromTitle( $title, $type );
$fc->clearCache();
}
return true;
}
}
|
