includes/resourceloader/ResourceLoaderWikiModule.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @author Trevor Parscal
  20  * @author Roan Kattouw
  21  */
  22
  23 defined( 'MEDIAWIKI' ) || die( 1 );
  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::isValidCssJsSubpage.
  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         abstract protected function getPages( ResourceLoaderContext $context );
  45
  46         /* Protected Methods */
  47
  48         /**
  49          * @param $title Title
  50          * @return null|string
  51          */
  52         protected function getContent( $title ) {
  53                 if ( $title->getNamespace() === NS_MEDIAWIKI ) {
  54                         $dbkey = $title->getDBkey();
  55                         return wfEmptyMsg( $dbkey ) ? '' : wfMsgExt( $dbkey, 'content' );
  56                 }
  57                 if ( !$title->isCssJsSubpage() ) {
  58                         return null;
  59                 }
  60                 $revision = Revision::newFromTitle( $title );
  61                 if ( !$revision ) {
  62                         return null;
  63                 }
  64                 return $revision->getRawText();
  65         }
  66
  67         /* Methods */
  68
  69         /**
  70          * @param $context ResourceLoaderContext
  71          * @return string
  72          */
  73         public function getScript( ResourceLoaderContext $context ) {
  74                 $scripts = '';
  75                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
  76                         if ( $options['type'] !== 'script' ) {
  77                                 continue;
  78                         }
  79                         $title = Title::newFromText( $titleText );
  80                         if ( !$title ) {
  81                                 continue;
  82                         }
  83                         $script = $this->getContent( $title );
  84                         if ( strval( $script ) !== '' ) {
  85                                 if ( strpos( $titleText, '*/' ) === false ) {
  86                                         $scripts .=  "/* $titleText */\n";
  87                                 }
  88                                 $scripts .= $script . "\n";
  89                         }
  90                 }
  91                 return $scripts;
  92         }
  93
  94         /**
  95          * @param $context ResourceLoaderContext
  96          * @return array
  97          */
  98         public function getStyles( ResourceLoaderContext $context ) {
  99                 global $wgScriptPath;
 100
 101                 $styles = array();
 102                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 103                         if ( $options['type'] !== 'style' ) {
 104                                 continue;
 105                         }
 106                         $title = Title::newFromText( $titleText );
 107                         if ( !$title ) {
 108                                 continue;
 109                         }
 110                         $media = isset( $options['media'] ) ? $options['media'] : 'all';
 111                         $style = $this->getContent( $title );
 112                         if ( strval( $style ) === '' ) {
 113                                 continue;
 114                         }
 115                         if ( $this->getFlip( $context ) ) {
 116                                 $style = CSSJanus::transform( $style, true, false );
 117                         }
 118                         $style = CSSMin::remap( $style, false, $wgScriptPath, true );
 119                         if ( !isset( $styles[$media] ) ) {
 120                                 $styles[$media] = '';
 121                         }
 122                         if ( strpos( $titleText, '*/' ) === false ) {
 123                                 $styles[$media] .=  "/* $titleText */\n";
 124                         }
 125                         $styles[$media] .= $style . "\n";
 126                 }
 127                 return $styles;
 128         }
 129
 130         /**
 131          * @param $context ResourceLoaderContext
 132          * @return int|mixed
 133          */
 134         public function getModifiedTime( ResourceLoaderContext $context ) {
 135                 $modifiedTime = 1; // wfTimestamp() interprets 0 as "now"
 136                 $mtimes = $this->getTitleMtimes( $context );
 137                 if ( count( $mtimes ) ) {
 138                         $modifiedTime = max( $modifiedTime, max( $mtimes ) );
 139                 }
 140                 return $modifiedTime;
 141         }
 142
 143         /**
 144          * @param $context ResourceLoaderContext
 145          * @return bool
 146          */
 147         public function isKnownEmpty( ResourceLoaderContext $context ) {
 148                 return count( $this->getTitleMtimes( $context ) ) == 0;
 149         }
 150
 151         /**
 152          * Get the modification times of all titles that would be loaded for
 153          * a given context.
 154          * @param $context ResourceLoaderContext: Context object
 155          * @return array( prefixed DB key => UNIX timestamp ), nonexistent titles are dropped
 156          */
 157         protected function getTitleMtimes( ResourceLoaderContext $context ) {
 158                 $hash = $context->getHash();
 159                 if ( isset( $this->titleMtimes[$hash] ) ) {
 160                         return $this->titleMtimes[$hash];
 161                 }
 162
 163                 $this->titleMtimes[$hash] = array();
 164                 $batch = new LinkBatch;
 165                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 166                         $batch->addObj( Title::newFromText( $titleText ) );
 167                 }
 168
 169                 if ( !$batch->isEmpty() ) {
 170                         $dbr = wfGetDB( DB_SLAVE );
 171                         $res = $dbr->select( 'page',
 172                                 array( 'page_namespace', 'page_title', 'page_touched' ),
 173                                 $batch->constructSet( 'page', $dbr ),
 174                                 __METHOD__
 175                         );
 176                         foreach ( $res as $row ) {
 177                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 178                                 $this->titleMtimes[$hash][$title->getPrefixedDBkey()] =
 179                                         wfTimestamp( TS_UNIX, $row->page_touched );
 180                         }
 181                 }
 182                 return $this->titleMtimes[$hash];
 183         }
 184 }