includes/resourceloader/ResourceLoaderWikiModule.php

   1 <?php
   2 /**
   3  * Abstraction for resource loader modules which pull from wiki pages.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @author Trevor Parscal
  22  * @author Roan Kattouw
  23  */
  24
  25 /**
  26  * Abstraction for resource loader modules which pull from wiki pages
  27  *
  28  * This can only be used for wiki pages in the MediaWiki and User namespaces,
  29  * because of its dependence on the functionality of
  30  * Title::isCssJsSubpage.
  31  */
  32 abstract class ResourceLoaderWikiModule extends ResourceLoaderModule {
  33
  34         /* Protected Members */
  35
  36         # Origin is user-supplied code
  37         protected $origin = self::ORIGIN_USER_SITEWIDE;
  38
  39         // In-object cache for title mtimes
  40         protected $titleMtimes = array();
  41
  42         /* Abstract Protected Methods */
  43
  44         /**
  45          * @abstract
  46          * @param $context ResourceLoaderContext
  47          */
  48         abstract protected function getPages( ResourceLoaderContext $context );
  49
  50         /* Protected Methods */
  51
  52         /**
  53          * Get the Database object used in getTitleMTimes(). Defaults to the local slave DB
  54          * but subclasses may want to override this to return a remote DB object, or to return
  55          * null if getTitleMTimes() shouldn't access the DB at all.
  56          *
  57          * NOTE: This ONLY works for getTitleMTimes() and getModifiedTime(), NOT FOR ANYTHING ELSE.
  58          * In particular, it doesn't work for getting the content of JS and CSS pages. That functionality
  59          * will use the local DB irrespective of the return value of this method.
  60          *
  61          * @return DatabaseBase|null
  62          */
  63         protected function getDB() {
  64                 return wfGetDB( DB_SLAVE );
  65         }
  66
  67         /**
  68          * @param $title Title
  69          * @return null|string
  70          */
  71         protected function getContent( $title ) {
  72                 if ( $title->getNamespace() === NS_MEDIAWIKI ) {
  73                         // The first "true" is to use the database, the second is to use the content langue
  74                         // and the last one is to specify the message key already contains the language in it ("/de", etc.)
  75                         $text = MessageCache::singleton()->get( $title->getDBkey(), true, true, true );
  76                         return $text === false ? '' : $text;
  77                 }
  78                 if ( !$title->isCssJsSubpage() && !$title->isCssOrJsPage() ) {
  79                         return null;
  80                 }
  81                 $revision = Revision::newFromTitle( $title );
  82                 if ( !$revision ) {
  83                         return null;
  84                 }
  85
  86                 $content = $revision->getContent( Revision::RAW );
  87                 $model = $content->getModel();
  88
  89                 if ( $model !== CONTENT_MODEL_CSS && $model !== CONTENT_MODEL_JAVASCRIPT ) {
  90                         wfDebug( __METHOD__ . "bad content model #$model for JS/CSS page!\n" );
  91                         return null;
  92                 }
  93
  94                 return $content->getNativeData(); //NOTE: this is safe, we know it's JS or CSS
  95         }
  96
  97         /* Methods */
  98
  99         /**
 100          * @param $context ResourceLoaderContext
 101          * @return string
 102          */
 103         public function getScript( ResourceLoaderContext $context ) {
 104                 $scripts = '';
 105                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 106                         if ( $options['type'] !== 'script' ) {
 107                                 continue;
 108                         }
 109                         $title = Title::newFromText( $titleText );
 110                         if ( !$title || $title->isRedirect() ) {
 111                                 continue;
 112                         }
 113                         $script = $this->getContent( $title );
 114                         if ( strval( $script ) !== '' ) {
 115                                 $script = $this->validateScriptFile( $titleText, $script );
 116                                 if ( strpos( $titleText, '*/' ) === false ) {
 117                                         $scripts .=  "/* $titleText */\n";
 118                                 }
 119                                 $scripts .= $script . "\n";
 120                         }
 121                 }
 122                 return $scripts;
 123         }
 124
 125         /**
 126          * @param $context ResourceLoaderContext
 127          * @return array
 128          */
 129         public function getStyles( ResourceLoaderContext $context ) {
 130                 global $wgScriptPath;
 131
 132                 $styles = array();
 133                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 134                         if ( $options['type'] !== 'style' ) {
 135                                 continue;
 136                         }
 137                         $title = Title::newFromText( $titleText );
 138                         if ( !$title || $title->isRedirect()  ) {
 139                                 continue;
 140                         }
 141                         $media = isset( $options['media'] ) ? $options['media'] : 'all';
 142                         $style = $this->getContent( $title );
 143                         if ( strval( $style ) === '' ) {
 144                                 continue;
 145                         }
 146                         if ( $this->getFlip( $context ) ) {
 147                                 $style = CSSJanus::transform( $style, true, false );
 148                         }
 149                         $style = CSSMin::remap( $style, false, $wgScriptPath, true );
 150                         if ( !isset( $styles[$media] ) ) {
 151                                 $styles[$media] = '';
 152                         }
 153                         if ( strpos( $titleText, '*/' ) === false ) {
 154                                 $styles[$media] .=  "/* $titleText */\n";
 155                         }
 156                         $styles[$media] .= $style . "\n";
 157                 }
 158                 return $styles;
 159         }
 160
 161         /**
 162          * @param $context ResourceLoaderContext
 163          * @return int|mixed
 164          */
 165         public function getModifiedTime( ResourceLoaderContext $context ) {
 166                 $modifiedTime = 1; // wfTimestamp() interprets 0 as "now"
 167                 $mtimes = $this->getTitleMtimes( $context );
 168                 if ( count( $mtimes ) ) {
 169                         $modifiedTime = max( $modifiedTime, max( $mtimes ) );
 170                 }
 171                 $modifiedTime = max( $modifiedTime, $this->getMsgBlobMtime( $context->getLanguage() ) );
 172                 return $modifiedTime;
 173         }
 174
 175         /**
 176          * @param $context ResourceLoaderContext
 177          * @return bool
 178          */
 179         public function isKnownEmpty( ResourceLoaderContext $context ) {
 180                 return count( $this->getTitleMtimes( $context ) ) == 0;
 181         }
 182
 183         /**
 184          * Get the modification times of all titles that would be loaded for
 185          * a given context.
 186          * @param $context ResourceLoaderContext: Context object
 187          * @return array( prefixed DB key => UNIX timestamp ), nonexistent titles are dropped
 188          */
 189         protected function getTitleMtimes( ResourceLoaderContext $context ) {
 190                 $dbr = $this->getDB();
 191                 if ( !$dbr ) {
 192                         // We're dealing with a subclass that doesn't have a DB
 193                         return array();
 194                 }
 195
 196                 $hash = $context->getHash();
 197                 if ( isset( $this->titleMtimes[$hash] ) ) {
 198                         return $this->titleMtimes[$hash];
 199                 }
 200
 201                 $this->titleMtimes[$hash] = array();
 202                 $batch = new LinkBatch;
 203                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 204                         $batch->addObj( Title::newFromText( $titleText ) );
 205                 }
 206
 207                 if ( !$batch->isEmpty() ) {
 208                         $res = $dbr->select( 'page',
 209                                 array( 'page_namespace', 'page_title', 'page_touched' ),
 210                                 $batch->constructSet( 'page', $dbr ),
 211                                 __METHOD__
 212                         );
 213                         foreach ( $res as $row ) {
 214                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 215                                 $this->titleMtimes[$hash][$title->getPrefixedDBkey()] =
 216                                         wfTimestamp( TS_UNIX, $row->page_touched );
 217                         }
 218                 }
 219                 return $this->titleMtimes[$hash];
 220         }
 221 }