includes/specialpage/SpecialPageFactory.php

   1 <?php
   2 /**
   3  * Factory for handling the special page list and generating SpecialPage objects.
   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  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24
  25 namespace MediaWiki\Special;
  26
  27 use Config;
  28 use Hooks;
  29 use IContextSource;
  30 use Language;
  31 use MediaWiki\Linker\LinkRenderer;
  32 use Profiler;
  33 use RequestContext;
  34 use SpecialPage;
  35 use Title;
  36 use User;
  37
  38 /**
  39  * Factory for handling the special page list and generating SpecialPage objects.
  40  *
  41  * To add a special page in an extension, add to $wgSpecialPages either
  42  * an object instance or an array containing the name and constructor
  43  * parameters. The latter is preferred for performance reasons.
  44  *
  45  * The object instantiated must be either an instance of SpecialPage or a
  46  * sub-class thereof. It must have an execute() method, which sends the HTML
  47  * for the special page to $wgOut. The parent class has an execute() method
  48  * which distributes the call to the historical global functions. Additionally,
  49  * execute() also checks if the user has the necessary access privileges
  50  * and bails out if not.
  51  *
  52  * To add a core special page, use the similar static list in
  53  * SpecialPageFactory::$list. To remove a core static special page at runtime, use
  54  * a SpecialPage_initList hook.
  55  *
  56  * @note There are two classes called SpecialPageFactory.  You should use this first one, in
  57  * namespace MediaWiki\Special, which is a service.  \SpecialPageFactory is a deprecated collection
  58  * of static methods that forwards to the global service.
  59  *
  60  * @ingroup SpecialPage
  61  * @since 1.17
  62  */
  63 class SpecialPageFactory {
  64         /**
  65          * List of special page names to the subclass of SpecialPage which handles them.
  66          * @todo Make this a const when we drop HHVM support (T192166).  It can still be private in PHP
  67          * 7.1.
  68          */
  69         private static $coreList = [
  70                 // Maintenance Reports
  71                 'BrokenRedirects' => \BrokenRedirectsPage::class,
  72                 'Deadendpages' => \DeadendPagesPage::class,
  73                 'DoubleRedirects' => \DoubleRedirectsPage::class,
  74                 'Longpages' => \LongPagesPage::class,
  75                 'Ancientpages' => \AncientPagesPage::class,
  76                 'Lonelypages' => \LonelyPagesPage::class,
  77                 'Fewestrevisions' => \FewestrevisionsPage::class,
  78                 'Withoutinterwiki' => \WithoutInterwikiPage::class,
  79                 'Protectedpages' => \SpecialProtectedpages::class,
  80                 'Protectedtitles' => \SpecialProtectedtitles::class,
  81                 'Shortpages' => \ShortPagesPage::class,
  82                 'Uncategorizedcategories' => \UncategorizedCategoriesPage::class,
  83                 'Uncategorizedimages' => \UncategorizedImagesPage::class,
  84                 'Uncategorizedpages' => \UncategorizedPagesPage::class,
  85                 'Uncategorizedtemplates' => \UncategorizedTemplatesPage::class,
  86                 'Unusedcategories' => \UnusedCategoriesPage::class,
  87                 'Unusedimages' => \UnusedimagesPage::class,
  88                 'Unusedtemplates' => \UnusedtemplatesPage::class,
  89                 'Unwatchedpages' => \UnwatchedpagesPage::class,
  90                 'Wantedcategories' => \WantedCategoriesPage::class,
  91                 'Wantedfiles' => \WantedFilesPage::class,
  92                 'Wantedpages' => \WantedPagesPage::class,
  93                 'Wantedtemplates' => \WantedTemplatesPage::class,
  94
  95                 // List of pages
  96                 'Allpages' => \SpecialAllPages::class,
  97                 'Prefixindex' => \SpecialPrefixindex::class,
  98                 'Categories' => \SpecialCategories::class,
  99                 'Listredirects' => \ListredirectsPage::class,
 100                 'PagesWithProp' => \SpecialPagesWithProp::class,
 101                 'TrackingCategories' => \SpecialTrackingCategories::class,
 102
 103                 // Authentication
 104                 'Userlogin' => \SpecialUserLogin::class,
 105                 'Userlogout' => \SpecialUserLogout::class,
 106                 'CreateAccount' => \SpecialCreateAccount::class,
 107                 'LinkAccounts' => \SpecialLinkAccounts::class,
 108                 'UnlinkAccounts' => \SpecialUnlinkAccounts::class,
 109                 'ChangeCredentials' => \SpecialChangeCredentials::class,
 110                 'RemoveCredentials' => \SpecialRemoveCredentials::class,
 111
 112                 // Users and rights
 113                 'Activeusers' => \SpecialActiveUsers::class,
 114                 'Block' => \SpecialBlock::class,
 115                 'Unblock' => \SpecialUnblock::class,
 116                 'BlockList' => \SpecialBlockList::class,
 117                 'AutoblockList' => \SpecialAutoblockList::class,
 118                 'ChangePassword' => \SpecialChangePassword::class,
 119                 'BotPasswords' => \SpecialBotPasswords::class,
 120                 'PasswordReset' => \SpecialPasswordReset::class,
 121                 'DeletedContributions' => \DeletedContributionsPage::class,
 122                 'Preferences' => \SpecialPreferences::class,
 123                 'ResetTokens' => \SpecialResetTokens::class,
 124                 'Contributions' => \SpecialContributions::class,
 125                 'Listgrouprights' => \SpecialListGroupRights::class,
 126                 'Listgrants' => \SpecialListGrants::class,
 127                 'Listusers' => \SpecialListUsers::class,
 128                 'Listadmins' => \SpecialListAdmins::class,
 129                 'Listbots' => \SpecialListBots::class,
 130                 'Userrights' => \UserrightsPage::class,
 131                 'EditWatchlist' => \SpecialEditWatchlist::class,
 132                 'PasswordPolicies' => \SpecialPasswordPolicies::class,
 133
 134                 // Recent changes and logs
 135                 'Newimages' => \SpecialNewFiles::class,
 136                 'Log' => \SpecialLog::class,
 137                 'Watchlist' => \SpecialWatchlist::class,
 138                 'Newpages' => \SpecialNewpages::class,
 139                 'Recentchanges' => \SpecialRecentChanges::class,
 140                 'Recentchangeslinked' => \SpecialRecentChangesLinked::class,
 141                 'Tags' => \SpecialTags::class,
 142
 143                 // Media reports and uploads
 144                 'Listfiles' => \SpecialListFiles::class,
 145                 'Filepath' => \SpecialFilepath::class,
 146                 'MediaStatistics' => \MediaStatisticsPage::class,
 147                 'MIMEsearch' => \MIMEsearchPage::class,
 148                 'FileDuplicateSearch' => \FileDuplicateSearchPage::class,
 149                 'Upload' => \SpecialUpload::class,
 150                 'UploadStash' => \SpecialUploadStash::class,
 151                 'ListDuplicatedFiles' => \ListDuplicatedFilesPage::class,
 152
 153                 // Data and tools
 154                 'ApiSandbox' => \SpecialApiSandbox::class,
 155                 'Statistics' => \SpecialStatistics::class,
 156                 'Allmessages' => \SpecialAllMessages::class,
 157                 'Version' => \SpecialVersion::class,
 158                 'Lockdb' => \SpecialLockdb::class,
 159                 'Unlockdb' => \SpecialUnlockdb::class,
 160
 161                 // Redirecting special pages
 162                 'LinkSearch' => \LinkSearchPage::class,
 163                 'Randompage' => \RandomPage::class,
 164                 'RandomInCategory' => \SpecialRandomInCategory::class,
 165                 'Randomredirect' => \SpecialRandomredirect::class,
 166                 'Randomrootpage' => \SpecialRandomrootpage::class,
 167                 'GoToInterwiki' => \SpecialGoToInterwiki::class,
 168
 169                 // High use pages
 170                 'Mostlinkedcategories' => \MostlinkedCategoriesPage::class,
 171                 'Mostimages' => \MostimagesPage::class,
 172                 'Mostinterwikis' => \MostinterwikisPage::class,
 173                 'Mostlinked' => \MostlinkedPage::class,
 174                 'Mostlinkedtemplates' => \MostlinkedTemplatesPage::class,
 175                 'Mostcategories' => \MostcategoriesPage::class,
 176                 'Mostrevisions' => \MostrevisionsPage::class,
 177
 178                 // Page tools
 179                 'ComparePages' => \SpecialComparePages::class,
 180                 'Export' => \SpecialExport::class,
 181                 'Import' => \SpecialImport::class,
 182                 'Undelete' => \SpecialUndelete::class,
 183                 'Whatlinkshere' => \SpecialWhatLinksHere::class,
 184                 'MergeHistory' => \SpecialMergeHistory::class,
 185                 'ExpandTemplates' => \SpecialExpandTemplates::class,
 186
 187                 // Other
 188                 'Booksources' => \SpecialBookSources::class,
 189
 190                 // Unlisted / redirects
 191                 'ApiHelp' => \SpecialApiHelp::class,
 192                 'Blankpage' => \SpecialBlankpage::class,
 193                 'Diff' => \SpecialDiff::class,
 194                 'EditTags' => \SpecialEditTags::class,
 195                 'Emailuser' => \SpecialEmailUser::class,
 196                 'Movepage' => \MovePageForm::class,
 197                 'Mycontributions' => \SpecialMycontributions::class,
 198                 'MyLanguage' => \SpecialMyLanguage::class,
 199                 'Mypage' => \SpecialMypage::class,
 200                 'Mytalk' => \SpecialMytalk::class,
 201                 'Myuploads' => \SpecialMyuploads::class,
 202                 'AllMyUploads' => \SpecialAllMyUploads::class,
 203                 'PermanentLink' => \SpecialPermanentLink::class,
 204                 'Redirect' => \SpecialRedirect::class,
 205                 'Revisiondelete' => \SpecialRevisionDelete::class,
 206                 'RunJobs' => \SpecialRunJobs::class,
 207                 'Specialpages' => \SpecialSpecialpages::class,
 208                 'PageData' => \SpecialPageData::class,
 209         ];
 210
 211         /** @var array Special page name => class name */
 212         private $list;
 213
 214         /** @var array */
 215         private $aliases;
 216
 217         /** @var Config */
 218         private $config;
 219
 220         /** @var Language */
 221         private $contLang;
 222
 223         /**
 224          * @param Config $config
 225          * @param Language $contLang
 226          */
 227         public function __construct( Config $config, Language $contLang ) {
 228                 $this->config = $config;
 229                 $this->contLang = $contLang;
 230         }
 231
 232         /**
 233          * Returns a list of canonical special page names.
 234          * May be used to iterate over all registered special pages.
 235          *
 236          * @return string[]
 237          */
 238         public function getNames() : array {
 239                 return array_keys( $this->getPageList() );
 240         }
 241
 242         /**
 243          * Get the special page list as an array
 244          *
 245          * @return array
 246          */
 247         private function getPageList() : array {
 248                 if ( !is_array( $this->list ) ) {
 249                         $this->list = self::$coreList;
 250
 251                         if ( !$this->config->get( 'DisableInternalSearch' ) ) {
 252                                 $this->list['Search'] = \SpecialSearch::class;
 253                         }
 254
 255                         if ( $this->config->get( 'EmailAuthentication' ) ) {
 256                                 $this->list['Confirmemail'] = \EmailConfirmation::class;
 257                                 $this->list['Invalidateemail'] = \EmailInvalidation::class;
 258                         }
 259
 260                         if ( $this->config->get( 'EnableEmail' ) ) {
 261                                 $this->list['ChangeEmail'] = \SpecialChangeEmail::class;
 262                         }
 263
 264                         if ( $this->config->get( 'EnableJavaScriptTest' ) ) {
 265                                 $this->list['JavaScriptTest'] = \SpecialJavaScriptTest::class;
 266                         }
 267
 268                         if ( $this->config->get( 'PageLanguageUseDB' ) ) {
 269                                 $this->list['PageLanguage'] = \SpecialPageLanguage::class;
 270                         }
 271                         if ( $this->config->get( 'ContentHandlerUseDB' ) ) {
 272                                 $this->list['ChangeContentModel'] = \SpecialChangeContentModel::class;
 273                         }
 274
 275                         // Add extension special pages
 276                         $this->list = array_merge( $this->list, $this->config->get( 'SpecialPages' ) );
 277
 278                         // This hook can be used to disable unwanted core special pages
 279                         // or conditionally register special pages.
 280                         Hooks::run( 'SpecialPage_initList', [ &$this->list ] );
 281
 282                 }
 283
 284                 return $this->list;
 285         }
 286
 287         /**
 288          * Initialise and return the list of special page aliases. Returns an array where
 289          * the key is an alias, and the value is the canonical name of the special page.
 290          * All registered special pages are guaranteed to map to themselves.
 291          * @return array
 292          */
 293         private function getAliasList() : array {
 294                 if ( is_null( $this->aliases ) ) {
 295                         $aliases = $this->contLang->getSpecialPageAliases();
 296                         $pageList = $this->getPageList();
 297
 298                         $this->aliases = [];
 299                         $keepAlias = [];
 300
 301                         // Force every canonical name to be an alias for itself.
 302                         foreach ( $pageList as $name => $stuff ) {
 303                                 $caseFoldedAlias = $this->contLang->caseFold( $name );
 304                                 $this->aliases[$caseFoldedAlias] = $name;
 305                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 306                         }
 307
 308                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 309                         if ( is_array( $aliases ) ) {
 310                                 foreach ( $aliases as $realName => $aliasList ) {
 311                                         $aliasList = array_values( $aliasList );
 312                                         foreach ( $aliasList as $i => $alias ) {
 313                                                 $caseFoldedAlias = $this->contLang->caseFold( $alias );
 314
 315                                                 if ( isset( $this->aliases[$caseFoldedAlias] ) &&
 316                                                         $realName === $this->aliases[$caseFoldedAlias]
 317                                                 ) {
 318                                                         // Ignore same-realName conflicts
 319                                                         continue;
 320                                                 }
 321
 322                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 323                                                         $this->aliases[$caseFoldedAlias] = $realName;
 324                                                         if ( !$i ) {
 325                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 326                                                         }
 327                                                 } elseif ( !$i ) {
 328                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 329                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 330                                                                 $this->aliases[$caseFoldedAlias]
 331                                                         );
 332                                                 }
 333                                         }
 334                                 }
 335                         }
 336                 }
 337
 338                 return $this->aliases;
 339         }
 340
 341         /**
 342          * Given a special page name with a possible subpage, return an array
 343          * where the first element is the special page name and the second is the
 344          * subpage.
 345          *
 346          * @param string $alias
 347          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 348          */
 349         public function resolveAlias( $alias ) {
 350                 $bits = explode( '/', $alias, 2 );
 351
 352                 $caseFoldedAlias = $this->contLang->caseFold( $bits[0] );
 353                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 354                 $aliases = $this->getAliasList();
 355                 if ( isset( $aliases[$caseFoldedAlias] ) ) {
 356                         $name = $aliases[$caseFoldedAlias];
 357                 } else {
 358                         return [ null, null ];
 359                 }
 360
 361                 if ( !isset( $bits[1] ) ) { // T4087
 362                         $par = null;
 363                 } else {
 364                         $par = $bits[1];
 365                 }
 366
 367                 return [ $name, $par ];
 368         }
 369
 370         /**
 371          * Check if a given name exist as a special page or as a special page alias
 372          *
 373          * @param string $name Name of a special page
 374          * @return bool True if a special page exists with this name
 375          */
 376         public function exists( $name ) {
 377                 list( $title, /*...*/ ) = $this->resolveAlias( $name );
 378
 379                 $specialPageList = $this->getPageList();
 380                 return isset( $specialPageList[$title] );
 381         }
 382
 383         /**
 384          * Find the object with a given name and return it (or NULL)
 385          *
 386          * @param string $name Special page name, may be localised and/or an alias
 387          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 388          */
 389         public function getPage( $name ) {
 390                 list( $realName, /*...*/ ) = $this->resolveAlias( $name );
 391
 392                 $specialPageList = $this->getPageList();
 393
 394                 if ( isset( $specialPageList[$realName] ) ) {
 395                         $rec = $specialPageList[$realName];
 396
 397                         if ( is_callable( $rec ) ) {
 398                                 // Use callback to instantiate the special page
 399                                 $page = $rec();
 400                         } elseif ( is_string( $rec ) ) {
 401                                 $className = $rec;
 402                                 $page = new $className;
 403                         } elseif ( $rec instanceof SpecialPage ) {
 404                                 $page = $rec; // XXX: we should deep clone here
 405                         } else {
 406                                 $page = null;
 407                         }
 408
 409                         if ( $page instanceof SpecialPage ) {
 410                                 return $page;
 411                         } else {
 412                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 413                                 // nor a special page object. Give up.
 414                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 415                                 return null;
 416                         }
 417
 418                 } else {
 419                         return null;
 420                 }
 421         }
 422
 423         /**
 424          * Return categorised listable special pages which are available
 425          * for the current user, and everyone.
 426          *
 427          * @param User $user User object to check permissions
 428          *  provided
 429          * @return array ( string => Specialpage )
 430          */
 431         public function getUsablePages( User $user ) : array {
 432                 $pages = [];
 433                 foreach ( $this->getPageList() as $name => $rec ) {
 434                         $page = $this->getPage( $name );
 435                         if ( $page ) { // not null
 436                                 $page->setContext( RequestContext::getMain() );
 437                                 if ( $page->isListed()
 438                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 439                                 ) {
 440                                         $pages[$name] = $page;
 441                                 }
 442                         }
 443                 }
 444
 445                 return $pages;
 446         }
 447
 448         /**
 449          * Return categorised listable special pages for all users
 450          *
 451          * @return array ( string => Specialpage )
 452          */
 453         public function getRegularPages() : array {
 454                 $pages = [];
 455                 foreach ( $this->getPageList() as $name => $rec ) {
 456                         $page = $this->getPage( $name );
 457                         if ( $page && $page->isListed() && !$page->isRestricted() ) {
 458                                 $pages[$name] = $page;
 459                         }
 460                 }
 461
 462                 return $pages;
 463         }
 464
 465         /**
 466          * Return categorised listable special pages which are available
 467          * for the current user, but not for everyone
 468          *
 469          * @param User $user User object to use
 470          * @return array ( string => Specialpage )
 471          */
 472         public function getRestrictedPages( User $user ) : array {
 473                 $pages = [];
 474                 foreach ( $this->getPageList() as $name => $rec ) {
 475                         $page = $this->getPage( $name );
 476                         if ( $page
 477                                 && $page->isListed()
 478                                 && $page->isRestricted()
 479                                 && $page->userCanExecute( $user )
 480                         ) {
 481                                 $pages[$name] = $page;
 482                         }
 483                 }
 484
 485                 return $pages;
 486         }
 487
 488         /**
 489          * Execute a special page path.
 490          * The path may contain parameters, e.g. Special:Name/Params
 491          * Extracts the special page name and call the execute method, passing the parameters
 492          *
 493          * Returns a title object if the page is redirected, false if there was no such special
 494          * page, and true if it was successful.
 495          *
 496          * @param Title &$title
 497          * @param IContextSource &$context
 498          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 499          * @param LinkRenderer|null $linkRenderer (since 1.28)
 500          *
 501          * @return bool|Title
 502          */
 503         public function executePath( Title &$title, IContextSource &$context, $including = false,
 504                 LinkRenderer $linkRenderer = null
 505         ) {
 506                 // @todo FIXME: Redirects broken due to this call
 507                 $bits = explode( '/', $title->getDBkey(), 2 );
 508                 $name = $bits[0];
 509                 if ( !isset( $bits[1] ) ) { // T4087
 510                         $par = null;
 511                 } else {
 512                         $par = $bits[1];
 513                 }
 514
 515                 $page = $this->getPage( $name );
 516                 if ( !$page ) {
 517                         $context->getOutput()->setArticleRelated( false );
 518                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 519
 520                         global $wgSend404Code;
 521                         if ( $wgSend404Code ) {
 522                                 $context->getOutput()->setStatusCode( 404 );
 523                         }
 524
 525                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 526
 527                         return false;
 528                 }
 529
 530                 if ( !$including ) {
 531                         // Narrow DB query expectations for this HTTP request
 532                         $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
 533                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 534                         if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
 535                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 536                                 $context->getRequest()->markAsSafeRequest();
 537                         }
 538                 }
 539
 540                 // Page exists, set the context
 541                 $page->setContext( $context );
 542
 543                 if ( !$including ) {
 544                         // Redirect to canonical alias for GET commands
 545                         // Not for POST, we'd lose the post data, so it's best to just distribute
 546                         // the request. Such POST requests are possible for old extensions that
 547                         // generate self-links without being aware that their default name has
 548                         // changed.
 549                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 550                                 $query = $context->getRequest()->getQueryValues();
 551                                 unset( $query['title'] );
 552                                 $title = $page->getPageTitle( $par );
 553                                 $url = $title->getFullURL( $query );
 554                                 $context->getOutput()->redirect( $url );
 555
 556                                 return $title;
 557                         } else {
 558                                 $context->setTitle( $page->getPageTitle( $par ) );
 559                         }
 560                 } elseif ( !$page->isIncludable() ) {
 561                         return false;
 562                 }
 563
 564                 $page->including( $including );
 565                 if ( $linkRenderer ) {
 566                         $page->setLinkRenderer( $linkRenderer );
 567                 }
 568
 569                 // Execute special page
 570                 $page->run( $par );
 571
 572                 return true;
 573         }
 574
 575         /**
 576          * Just like executePath() but will override global variables and execute
 577          * the page in "inclusion" mode. Returns true if the execution was
 578          * successful or false if there was no such special page, or a title object
 579          * if it was a redirect.
 580          *
 581          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 582          * variables so that the special page will get the context it'd expect on a
 583          * normal request, and then restores them to their previous values after.
 584          *
 585          * @param Title $title
 586          * @param IContextSource $context
 587          * @param LinkRenderer|null $linkRenderer (since 1.28)
 588          * @return string HTML fragment
 589          */
 590         public function capturePath(
 591                 Title $title, IContextSource $context, LinkRenderer $linkRenderer = null
 592         ) {
 593                 global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
 594                 $main = RequestContext::getMain();
 595
 596                 // Save current globals and main context
 597                 $glob = [
 598                         'title' => $wgTitle,
 599                         'output' => $wgOut,
 600                         'request' => $wgRequest,
 601                         'user' => $wgUser,
 602                         'language' => $wgLang,
 603                 ];
 604                 $ctx = [
 605                         'title' => $main->getTitle(),
 606                         'output' => $main->getOutput(),
 607                         'request' => $main->getRequest(),
 608                         'user' => $main->getUser(),
 609                         'language' => $main->getLanguage(),
 610                 ];
 611
 612                 // Override
 613                 $wgTitle = $title;
 614                 $wgOut = $context->getOutput();
 615                 $wgRequest = $context->getRequest();
 616                 $wgUser = $context->getUser();
 617                 $wgLang = $context->getLanguage();
 618                 $main->setTitle( $title );
 619                 $main->setOutput( $context->getOutput() );
 620                 $main->setRequest( $context->getRequest() );
 621                 $main->setUser( $context->getUser() );
 622                 $main->setLanguage( $context->getLanguage() );
 623
 624                 // The useful part
 625                 $ret = $this->executePath( $title, $context, true, $linkRenderer );
 626
 627                 // Restore old globals and context
 628                 $wgTitle = $glob['title'];
 629                 $wgOut = $glob['output'];
 630                 $wgRequest = $glob['request'];
 631                 $wgUser = $glob['user'];
 632                 $wgLang = $glob['language'];
 633                 $main->setTitle( $ctx['title'] );
 634                 $main->setOutput( $ctx['output'] );
 635                 $main->setRequest( $ctx['request'] );
 636                 $main->setUser( $ctx['user'] );
 637                 $main->setLanguage( $ctx['language'] );
 638
 639                 return $ret;
 640         }
 641
 642         /**
 643          * Get the local name for a specified canonical name
 644          *
 645          * @param string $name
 646          * @param string|bool $subpage
 647          * @return string
 648          */
 649         public function getLocalNameFor( $name, $subpage = false ) {
 650                 $aliases = $this->contLang->getSpecialPageAliases();
 651                 $aliasList = $this->getAliasList();
 652
 653                 // Find the first alias that maps back to $name
 654                 if ( isset( $aliases[$name] ) ) {
 655                         $found = false;
 656                         foreach ( $aliases[$name] as $alias ) {
 657                                 $caseFoldedAlias = $this->contLang->caseFold( $alias );
 658                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 659                                 if ( isset( $aliasList[$caseFoldedAlias] ) &&
 660                                         $aliasList[$caseFoldedAlias] === $name
 661                                 ) {
 662                                         $name = $alias;
 663                                         $found = true;
 664                                         break;
 665                                 }
 666                         }
 667                         if ( !$found ) {
 668                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 669                                         "It seems all defined aliases conflict?" );
 670                         }
 671                 } else {
 672                         // Check if someone misspelled the correct casing
 673                         if ( is_array( $aliases ) ) {
 674                                 foreach ( $aliases as $n => $values ) {
 675                                         if ( strcasecmp( $name, $n ) === 0 ) {
 676                                                 wfWarn( "Found alias defined for $n when searching for " .
 677                                                         "special page aliases for $name. Case mismatch?" );
 678                                                 return $this->getLocalNameFor( $n, $subpage );
 679                                         }
 680                                 }
 681                         }
 682
 683                         wfWarn( "Did not find alias for special page '$name'. " .
 684                                 "Perhaps no aliases are defined for it?" );
 685                 }
 686
 687                 if ( $subpage !== false && !is_null( $subpage ) ) {
 688                         // Make sure it's in dbkey form
 689                         $subpage = str_replace( ' ', '_', $subpage );
 690                         $name = "$name/$subpage";
 691                 }
 692
 693                 return $this->contLang->ucfirst( $name );
 694         }
 695
 696         /**
 697          * Get a title for a given alias
 698          *
 699          * @param string $alias
 700          * @return Title|null Title or null if there is no such alias
 701          */
 702         public function getTitleForAlias( $alias ) {
 703                 list( $name, $subpage ) = $this->resolveAlias( $alias );
 704                 if ( $name != null ) {
 705                         return SpecialPage::getTitleFor( $name, $subpage );
 706                 } else {
 707                         return null;
 708                 }
 709         }
 710 }