includes/resourceloader/ResourceLoaderWikiModule.php

   1 <?php
   2 /**
   3  * Abstraction for ResourceLoader modules that 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 ResourceLoader 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 Title::isCssJsSubpage
  30  * and Title::isCssOrJsPage().
  31  *
  32  * This module supports being used as a placeholder for a module on a remote wiki.
  33  * To do so, getDB() must be overloaded to return a foreign database object that
  34  * allows local wikis to query page metadata.
  35  *
  36  * Safe for calls on local wikis are:
  37  * - Option getters:
  38  *   - getGroup()
  39  *   - getPages()
  40  * - Basic methods that strictly involve the foreign database
  41  *   - getDB()
  42  *   - isKnownEmpty()
  43  *   - getTitleInfo()
  44  */
  45 class ResourceLoaderWikiModule extends ResourceLoaderModule {
  46
  47         // Origin defaults to users with sitewide authority
  48         protected $origin = self::ORIGIN_USER_SITEWIDE;
  49
  50         // In-process cache for title info
  51         protected $titleInfo = [];
  52
  53         // List of page names that contain CSS
  54         protected $styles = [];
  55
  56         // List of page names that contain JavaScript
  57         protected $scripts = [];
  58
  59         // Group of module
  60         protected $group;
  61
  62         /**
  63          * @param array $options For back-compat, this can be omitted in favour of overwriting getPages.
  64          */
  65         public function __construct( array $options = null ) {
  66                 if ( is_null( $options ) ) {
  67                         return;
  68                 }
  69
  70                 foreach ( $options as $member => $option ) {
  71                         switch ( $member ) {
  72                                 case 'styles':
  73                                 case 'scripts':
  74                                 case 'group':
  75                                 case 'targets':
  76                                         $this->{$member} = $option;
  77                                         break;
  78                         }
  79                 }
  80         }
  81
  82         /**
  83          * Subclasses should return an associative array of resources in the module.
  84          * Keys should be the title of a page in the MediaWiki or User namespace.
  85          *
  86          * Values should be a nested array of options.  The supported keys are 'type' and
  87          * (CSS only) 'media'.
  88          *
  89          * For scripts, 'type' should be 'script'.
  90          *
  91          * For stylesheets, 'type' should be 'style'.
  92          * There is an optional media key, the value of which can be the
  93          * medium ('screen', 'print', etc.) of the stylesheet.
  94          *
  95          * @param ResourceLoaderContext $context
  96          * @return array
  97          */
  98         protected function getPages( ResourceLoaderContext $context ) {
  99                 $config = $this->getConfig();
 100                 $pages = [];
 101
 102                 // Filter out pages from origins not allowed by the current wiki configuration.
 103                 if ( $config->get( 'UseSiteJs' ) ) {
 104                         foreach ( $this->scripts as $script ) {
 105                                 $pages[$script] = [ 'type' => 'script' ];
 106                         }
 107                 }
 108
 109                 if ( $config->get( 'UseSiteCss' ) ) {
 110                         foreach ( $this->styles as $style ) {
 111                                 $pages[$style] = [ 'type' => 'style' ];
 112                         }
 113                 }
 114
 115                 return $pages;
 116         }
 117
 118         /**
 119          * Get group name
 120          *
 121          * @return string
 122          */
 123         public function getGroup() {
 124                 return $this->group;
 125         }
 126
 127         /**
 128          * Get the Database object used in getTitleInfo().
 129          *
 130          * Defaults to the local replica DB. Subclasses may want to override this to return a foreign
 131          * database object, or null if getTitleInfo() shouldn't access the database.
 132          *
 133          * NOTE: This ONLY works for getTitleInfo() and isKnownEmpty(), NOT FOR ANYTHING ELSE.
 134          * In particular, it doesn't work for getContent() or getScript() etc.
 135          *
 136          * @return IDatabase|null
 137          */
 138         protected function getDB() {
 139                 return wfGetDB( DB_REPLICA );
 140         }
 141
 142         /**
 143          * @param string $titleText
 144          * @return null|string
 145          */
 146         protected function getContent( $titleText ) {
 147                 $title = Title::newFromText( $titleText );
 148                 if ( !$title ) {
 149                         return null;
 150                 }
 151
 152                 // If the page is a redirect, follow the redirect.
 153                 if ( $title->isRedirect() ) {
 154                         $content = $this->getContentObj( $title );
 155                         $title = $content ? $content->getUltimateRedirectTarget() : null;
 156                         if ( !$title ) {
 157                                 return null;
 158                         }
 159                 }
 160
 161                 $handler = ContentHandler::getForTitle( $title );
 162                 if ( $handler->isSupportedFormat( CONTENT_FORMAT_CSS ) ) {
 163                         $format = CONTENT_FORMAT_CSS;
 164                 } elseif ( $handler->isSupportedFormat( CONTENT_FORMAT_JAVASCRIPT ) ) {
 165                         $format = CONTENT_FORMAT_JAVASCRIPT;
 166                 } else {
 167                         return null;
 168                 }
 169
 170                 $content = $this->getContentObj( $title );
 171                 if ( !$content ) {
 172                         return null;
 173                 }
 174
 175                 return $content->serialize( $format );
 176         }
 177
 178         /**
 179          * @param Title $title
 180          * @return Content|null
 181          */
 182         protected function getContentObj( Title $title ) {
 183                 $revision = Revision::newKnownCurrent( wfGetDB( DB_REPLICA ), $title->getArticleID(),
 184                         $title->getLatestRevID() );
 185                 if ( !$revision ) {
 186                         return null;
 187                 }
 188                 $revision->setTitle( $title );
 189                 $content = $revision->getContent( Revision::RAW );
 190                 if ( !$content ) {
 191                         wfDebugLog( 'resourceloader', __METHOD__ . ': failed to load content of JS/CSS page!' );
 192                         return null;
 193                 }
 194                 return $content;
 195         }
 196
 197         /**
 198          * @param ResourceLoaderContext $context
 199          * @return string
 200          */
 201         public function getScript( ResourceLoaderContext $context ) {
 202                 $scripts = '';
 203                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 204                         if ( $options['type'] !== 'script' ) {
 205                                 continue;
 206                         }
 207                         $script = $this->getContent( $titleText );
 208                         if ( strval( $script ) !== '' ) {
 209                                 $script = $this->validateScriptFile( $titleText, $script );
 210                                 $scripts .= ResourceLoader::makeComment( $titleText ) . $script . "\n";
 211                         }
 212                 }
 213                 return $scripts;
 214         }
 215
 216         /**
 217          * @param ResourceLoaderContext $context
 218          * @return array
 219          */
 220         public function getStyles( ResourceLoaderContext $context ) {
 221                 $styles = [];
 222                 foreach ( $this->getPages( $context ) as $titleText => $options ) {
 223                         if ( $options['type'] !== 'style' ) {
 224                                 continue;
 225                         }
 226                         $media = isset( $options['media'] ) ? $options['media'] : 'all';
 227                         $style = $this->getContent( $titleText );
 228                         if ( strval( $style ) === '' ) {
 229                                 continue;
 230                         }
 231                         if ( $this->getFlip( $context ) ) {
 232                                 $style = CSSJanus::transform( $style, true, false );
 233                         }
 234                         $style = MemoizedCallable::call( 'CSSMin::remap',
 235                                 [ $style, false, $this->getConfig()->get( 'ScriptPath' ), true ] );
 236                         if ( !isset( $styles[$media] ) ) {
 237                                 $styles[$media] = [];
 238                         }
 239                         $style = ResourceLoader::makeComment( $titleText ) . $style;
 240                         $styles[$media][] = $style;
 241                 }
 242                 return $styles;
 243         }
 244
 245         /**
 246          * Disable module content versioning.
 247          *
 248          * This class does not support generating content outside of a module
 249          * request due to foreign database support.
 250          *
 251          * See getDefinitionSummary() for meta-data versioning.
 252          *
 253          * @return bool
 254          */
 255         public function enableModuleContentVersion() {
 256                 return false;
 257         }
 258
 259         /**
 260          * @param ResourceLoaderContext $context
 261          * @return array
 262          */
 263         public function getDefinitionSummary( ResourceLoaderContext $context ) {
 264                 $summary = parent::getDefinitionSummary( $context );
 265                 $summary[] = [
 266                         'pages' => $this->getPages( $context ),
 267                         // Includes meta data of current revisions
 268                         'titleInfo' => $this->getTitleInfo( $context ),
 269                 ];
 270                 return $summary;
 271         }
 272
 273         /**
 274          * @param ResourceLoaderContext $context
 275          * @return bool
 276          */
 277         public function isKnownEmpty( ResourceLoaderContext $context ) {
 278                 $revisions = $this->getTitleInfo( $context );
 279
 280                 // For user modules, don't needlessly load if there are no non-empty pages
 281                 if ( $this->getGroup() === 'user' ) {
 282                         foreach ( $revisions as $revision ) {
 283                                 if ( $revision['page_len'] > 0 ) {
 284                                         // At least one non-empty page, module should be loaded
 285                                         return false;
 286                                 }
 287                         }
 288                         return true;
 289                 }
 290
 291                 // T70488: For other modules (i.e. ones that are called in cached html output) only check
 292                 // page existance. This ensures that, if some pages in a module are temporarily blanked,
 293                 // we don't end omit the module's script or link tag on some pages.
 294                 return count( $revisions ) === 0;
 295         }
 296
 297         private function setTitleInfo( $key, array $titleInfo ) {
 298                 $this->titleInfo[$key] = $titleInfo;
 299         }
 300
 301         /**
 302          * Get the information about the wiki pages for a given context.
 303          * @param ResourceLoaderContext $context
 304          * @return array Keyed by page name
 305          */
 306         protected function getTitleInfo( ResourceLoaderContext $context ) {
 307                 $dbr = $this->getDB();
 308                 if ( !$dbr ) {
 309                         // We're dealing with a subclass that doesn't have a DB
 310                         return [];
 311                 }
 312
 313                 $pageNames = array_keys( $this->getPages( $context ) );
 314                 sort( $pageNames );
 315                 $key = implode( '|', $pageNames );
 316                 if ( !isset( $this->titleInfo[$key] ) ) {
 317                         $this->titleInfo[$key] = static::fetchTitleInfo( $dbr, $pageNames, __METHOD__ );
 318                 }
 319                 return $this->titleInfo[$key];
 320         }
 321
 322         protected static function fetchTitleInfo( IDatabase $db, array $pages, $fname = __METHOD__ ) {
 323                 $titleInfo = [];
 324                 $batch = new LinkBatch;
 325                 foreach ( $pages as $titleText ) {
 326                         $title = Title::newFromText( $titleText );
 327                         if ( $title ) {
 328                                 // Page name may be invalid if user-provided (e.g. gadgets)
 329                                 $batch->addObj( $title );
 330                         }
 331                 }
 332                 if ( !$batch->isEmpty() ) {
 333                         $res = $db->select( 'page',
 334                                 // Include page_touched to allow purging if cache is poisoned (T117587, T113916)
 335                                 [ 'page_namespace', 'page_title', 'page_touched', 'page_len', 'page_latest' ],
 336                                 $batch->constructSet( 'page', $db ),
 337                                 $fname
 338                         );
 339                         foreach ( $res as $row ) {
 340                                 // Avoid including ids or timestamps of revision/page tables so
 341                                 // that versions are not wasted
 342                                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 343                                 $titleInfo[$title->getPrefixedText()] = [
 344                                         'page_len' => $row->page_len,
 345                                         'page_latest' => $row->page_latest,
 346                                         'page_touched' => $row->page_touched,
 347                                 ];
 348                         }
 349                 }
 350                 return $titleInfo;
 351         }
 352
 353         /**
 354          * @since 1.28
 355          * @param ResourceLoaderContext $context
 356          * @param IDatabase $db
 357          * @param string[] $moduleNames
 358          */
 359         public static function preloadTitleInfo(
 360                 ResourceLoaderContext $context, IDatabase $db, array $moduleNames
 361         ) {
 362                 $rl = $context->getResourceLoader();
 363                 // getDB() can be overridden to point to a foreign database.
 364                 // For now, only preload local. In the future, we could preload by wikiID.
 365                 $allPages = [];
 366                 /** @var ResourceLoaderWikiModule[] $wikiModules */
 367                 $wikiModules = [];
 368                 foreach ( $moduleNames as $name ) {
 369                         $module = $rl->getModule( $name );
 370                         if ( $module instanceof self ) {
 371                                 $mDB = $module->getDB();
 372                                 // Subclasses may disable getDB and implement getTitleInfo differently
 373                                 if ( $mDB && $mDB->getWikiID() === $db->getWikiID() ) {
 374                                         $wikiModules[] = $module;
 375                                         $allPages += $module->getPages( $context );
 376                                 }
 377                         }
 378                 }
 379
 380                 if ( !$wikiModules ) {
 381                         // Nothing to preload
 382                         return;
 383                 }
 384
 385                 $pageNames = array_keys( $allPages );
 386                 sort( $pageNames );
 387                 $hash = sha1( implode( '|', $pageNames ) );
 388
 389                 // Avoid Zend bug where "static::" does not apply LSB in the closure
 390                 $func = [ static::class, 'fetchTitleInfo' ];
 391                 $fname = __METHOD__;
 392
 393                 $cache = ObjectCache::getMainWANInstance();
 394                 $allInfo = $cache->getWithSetCallback(
 395                         $cache->makeGlobalKey( 'resourceloader', 'titleinfo', $db->getWikiID(), $hash ),
 396                         $cache::TTL_HOUR,
 397                         function ( $curVal, &$ttl, array &$setOpts ) use ( $func, $pageNames, $db, $fname ) {
 398                                 $setOpts += Database::getCacheSetOptions( $db );
 399
 400                                 return call_user_func( $func, $db, $pageNames, $fname );
 401                         },
 402                         [ 'checkKeys' => [ $cache->makeGlobalKey( 'resourceloader', 'titleinfo', $db->getWikiID() ) ] ]
 403                 );
 404
 405                 foreach ( $wikiModules as $wikiModule ) {
 406                         $pages = $wikiModule->getPages( $context );
 407                         // Before we intersect, map the names to canonical form (T145673).
 408                         $intersect = [];
 409                         foreach ( $pages as $page => $unused ) {
 410                                 $title = Title::newFromText( $page );
 411                                 if ( $title ) {
 412                                         $intersect[ $title->getPrefixedText() ] = 1;
 413                                 } else {
 414                                         // Page name may be invalid if user-provided (e.g. gadgets)
 415                                         $rl->getLogger()->info(
 416                                                 'Invalid wiki page title "{title}" in ' . __METHOD__,
 417                                                 [ 'title' => $page ]
 418                                         );
 419                                 }
 420                         }
 421                         $info = array_intersect_key( $allInfo, $intersect );
 422                         $pageNames = array_keys( $pages );
 423                         sort( $pageNames );
 424                         $key = implode( '|', $pageNames );
 425                         $wikiModule->setTitleInfo( $key, $info );
 426                 }
 427         }
 428
 429         /**
 430          * Clear the preloadTitleInfo() cache for all wiki modules on this wiki on
 431          * page change if it was a JS or CSS page
 432          *
 433          * @param Title $title
 434          * @param Revision|null $old Prior page revision
 435          * @param Revision|null $new New page revision
 436          * @param string $wikiId
 437          * @since 1.28
 438          */
 439         public static function invalidateModuleCache(
 440                 Title $title, Revision $old = null, Revision $new = null, $wikiId
 441         ) {
 442                 static $formats = [ CONTENT_FORMAT_CSS, CONTENT_FORMAT_JAVASCRIPT ];
 443
 444                 if ( $old && in_array( $old->getContentFormat(), $formats ) ) {
 445                         $purge = true;
 446                 } elseif ( $new && in_array( $new->getContentFormat(), $formats ) ) {
 447                         $purge = true;
 448                 } else {
 449                         $purge = ( $title->isCssOrJsPage() || $title->isCssJsSubpage() );
 450                 }
 451
 452                 if ( $purge ) {
 453                         $cache = ObjectCache::getMainWANInstance();
 454                         $key = $cache->makeGlobalKey( 'resourceloader', 'titleinfo', $wikiId );
 455                         $cache->touchCheckKey( $key );
 456                 }
 457         }
 458
 459         /**
 460          * @since 1.28
 461          * @return string
 462          */
 463         public function getType() {
 464                 // Check both because subclasses don't always pass pages via the constructor,
 465                 // they may also override getPages() instead, in which case we should keep
 466                 // defaulting to LOAD_GENERAL and allow them to override getType() separately.
 467                 return ( $this->styles && !$this->scripts ) ? self::LOAD_STYLES : self::LOAD_GENERAL;
 468         }
 469 }