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<?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;
}
}
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