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          * Subclasses should return an associative array of resources in the module.
  46          * Keys should be the title of a page in the MediaWiki or User namespace.
  47          *
  48          * Values should be a nested array of options.  The supported keys are 'type' and
  49          * (CSS only) 'media'.
  50          *
  51          * For scripts, 'type' should be 'script'.
  52          *
  53          * For stylesheets, 'type' should be 'style'.
  54          * There is an optional media key, the value of which can be the
  55          * medium ('screen', 'print', etc.) of the stylesheet.
  56          *
  57          * @param $context ResourceLoaderContext
  58          * @return array
  59          */
  60         abstract protected function getPages( ResourceLoaderContext $context );
  61
  62         /* Protected Methods */
  63
  64         /**
  65          * Get the Database object used in getTitleMTimes(). Defaults to the local slave DB
  66          * but subclasses may want to override this to return a remote DB object, or to return
  67          * null if getTitleMTimes() shouldn't access the DB at all.
  68          *
  69          * NOTE: This ONLY works for getTitleMTimes() and getModifiedTime(), NOT FOR ANYTHING ELSE.
  70          * In particular, it doesn't work for getting the content of JS and CSS pages. That functionality
  71          * will use the local DB irrespective of the return value of this method.
  72          *
  73          * @return DatabaseBase|null
  74          */
  75         protected function getDB() {
  76                 return wfGetDB( DB_SLAVE );
  77         }
  78
  79         /**
  80          * @param $title Title
  81          * @return null|string
  82          */
  83         protected function getContent( $title ) {
  84                 if ( !$title->isCssJsSubpage() && !$title->isCssOrJsPage() ) {
  85                         return null;
  86                 }
  87                 $revision = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
  88                 if ( !$revision ) {
  89                         return null;
  90                 }
  91
  92                 $content = $revision->getContent( Revision::RAW );
  93
  94                 if ( !$content ) {
  95                         wfDebug( __METHOD__ . "failed to load content of JS/CSS page!\n" );
  96                         return null;
  97                 }
  98
  99                 $model = $content->getModel();
 100
 101                 if ( $model !== CONTENT_MODEL_CSS && $model !== CONTENT_MODEL_JAVASCRIPT ) {
 102                         wfDebug( __METHOD__ . "bad content model $model for JS/CSS page!\n" );
 103                         return null;
 104                 }
 105
 106                 return $content->getNativeData(); //NOTE: this is safe, we know it's JS or CSS
 107         }
 108
 109         /* Methods */
 110
 111         /**
 112          * @param $context ResourceLoaderContext
 113          * @return string
 114          */
 115         public function getScript( ResourceLoaderContext $context ) {
 116                 $scripts = '';
 117                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 118                         if ( $options['type'] !== 'script' ) {
 119                                 continue;
 120                         }
 121                         $title = Title::newFromText( $titleText );
 122                         if ( !$title || $title->isRedirect() ) {
 123                                 continue;
 124                         }
 125                         $script = $this->getContent( $title );
 126                         if ( strval( $script ) !== '' ) {
 127                                 $script = $this->validateScriptFile( $titleText, $script );
 128                                 if ( strpos( $titleText, '*/' ) === false ) {
 129                                         $scripts .=  "/* $titleText */\n";
 130                                 }
 131                                 $scripts .= $script . "\n";
 132                         }
 133                 }
 134                 return $scripts;
 135         }
 136
 137         /**
 138          * @param $context ResourceLoaderContext
 139          * @return array
 140          */
 141         public function getStyles( ResourceLoaderContext $context ) {
 142                 global $wgScriptPath;
 143
 144                 $styles = array();
 145                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 146                         if ( $options['type'] !== 'style' ) {
 147                                 continue;
 148                         }
 149                         $title = Title::newFromText( $titleText );
 150                         if ( !$title || $title->isRedirect()  ) {
 151                                 continue;
 152                         }
 153                         $media = isset( $options['media'] ) ? $options['media'] : 'all';
 154                         $style = $this->getContent( $title );
 155                         if ( strval( $style ) === '' ) {
 156                                 continue;
 157                         }
 158                         if ( $this->getFlip( $context ) ) {
 159                                 $style = CSSJanus::transform( $style, true, false );
 160                         }
 161                         $style = CSSMin::remap( $style, false, $wgScriptPath, true );
 162                         if ( !isset( $styles[$media] ) ) {
 163                                 $styles[$media] = array();
 164                         }
 165                         if ( strpos( $titleText, '*/' ) === false ) {
 166                                 $style =  "/* $titleText */\n" . $style;
 167                         }
 168                         $styles[$media][] = $style;
 169                 }
 170                 return $styles;
 171         }
 172
 173         /**
 174          * @param $context ResourceLoaderContext
 175          * @return int|mixed
 176          */
 177         public function getModifiedTime( ResourceLoaderContext $context ) {
 178                 $modifiedTime = 1; // wfTimestamp() interprets 0 as "now"
 179                 $mtimes = $this->getTitleMtimes( $context );
 180                 if ( count( $mtimes ) ) {
 181                         $modifiedTime = max( $modifiedTime, max( $mtimes ) );
 182                 }
 183                 $modifiedTime = max( $modifiedTime, $this->getMsgBlobMtime( $context->getLanguage() ) );
 184                 return $modifiedTime;
 185         }
 186
 187         /**
 188          * @param $context ResourceLoaderContext
 189          * @return bool
 190          */
 191         public function isKnownEmpty( ResourceLoaderContext $context ) {
 192                 return count( $this->getTitleMtimes( $context ) ) == 0;
 193         }
 194
 195         /**
 196          * Get the modification times of all titles that would be loaded for
 197          * a given context.
 198          * @param $context ResourceLoaderContext: Context object
 199          * @return array( prefixed DB key => UNIX timestamp ), nonexistent titles are dropped
 200          */
 201         protected function getTitleMtimes( ResourceLoaderContext $context ) {
 202                 $dbr = $this->getDB();
 203                 if ( !$dbr ) {
 204                         // We're dealing with a subclass that doesn't have a DB
 205                         return array();
 206                 }
 207
 208                 $hash = $context->getHash();
 209                 if ( isset( $this->titleMtimes[$hash] ) ) {
 210                         return $this->titleMtimes[$hash];
 211                 }
 212
 213                 $this->titleMtimes[$hash] = array();
 214                 $batch = new LinkBatch;
 215                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 216                         $batch->addObj( Title::newFromText( $titleText ) );
 217                 }
 218
 219                 if ( !$batch->isEmpty() ) {
 220                         $res = $dbr->select( 'page',
 221                                 array( 'page_namespace', 'page_title', 'page_touched' ),
 222                                 $batch->constructSet( 'page', $dbr ),
 223                                 __METHOD__
 224                         );
 225                         foreach ( $res as $row ) {
 226                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 227                                 $this->titleMtimes[$hash][$title->getPrefixedDBkey()] =
 228                                         wfTimestamp( TS_UNIX, $row->page_touched );
 229                         }
 230                 }
 231                 return $this->titleMtimes[$hash];
 232         }
 233 }