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 /**
  26  * Factory for handling the special page list and generating SpecialPage objects.
  27  *
  28  * To add a special page in an extension, add to $wgSpecialPages either
  29  * an object instance or an array containing the name and constructor
  30  * parameters. The latter is preferred for performance reasons.
  31  *
  32  * The object instantiated must be either an instance of SpecialPage or a
  33  * sub-class thereof. It must have an execute() method, which sends the HTML
  34  * for the special page to $wgOut. The parent class has an execute() method
  35  * which distributes the call to the historical global functions. Additionally,
  36  * execute() also checks if the user has the necessary access privileges
  37  * and bails out if not.
  38  *
  39  * To add a core special page, use the similar static list in
  40  * SpecialPageFactory::$list. To remove a core static special page at runtime, use
  41  * a SpecialPage_initList hook.
  42  *
  43  * @ingroup SpecialPage
  44  * @since 1.17
  45  */
  46 class SpecialPageFactory {
  47         /**
  48          * List of special page names to the subclass of SpecialPage which handles them.
  49          */
  50         private static $coreList = [
  51                 // Maintenance Reports
  52                 'BrokenRedirects' => 'BrokenRedirectsPage',
  53                 'Deadendpages' => 'DeadendPagesPage',
  54                 'DoubleRedirects' => 'DoubleRedirectsPage',
  55                 'Longpages' => 'LongPagesPage',
  56                 'Ancientpages' => 'AncientPagesPage',
  57                 'Lonelypages' => 'LonelyPagesPage',
  58                 'Fewestrevisions' => 'FewestrevisionsPage',
  59                 'Withoutinterwiki' => 'WithoutInterwikiPage',
  60                 'Protectedpages' => 'SpecialProtectedpages',
  61                 'Protectedtitles' => 'SpecialProtectedtitles',
  62                 'Shortpages' => 'ShortPagesPage',
  63                 'Uncategorizedcategories' => 'UncategorizedCategoriesPage',
  64                 'Uncategorizedimages' => 'UncategorizedImagesPage',
  65                 'Uncategorizedpages' => 'UncategorizedPagesPage',
  66                 'Uncategorizedtemplates' => 'UncategorizedTemplatesPage',
  67                 'Unusedcategories' => 'UnusedCategoriesPage',
  68                 'Unusedimages' => 'UnusedimagesPage',
  69                 'Unusedtemplates' => 'UnusedtemplatesPage',
  70                 'Unwatchedpages' => 'UnwatchedpagesPage',
  71                 'Wantedcategories' => 'WantedCategoriesPage',
  72                 'Wantedfiles' => 'WantedFilesPage',
  73                 'Wantedpages' => 'WantedPagesPage',
  74                 'Wantedtemplates' => 'WantedTemplatesPage',
  75
  76                 // List of pages
  77                 'Allpages' => 'SpecialAllPages',
  78                 'Prefixindex' => 'SpecialPrefixindex',
  79                 'Categories' => 'SpecialCategories',
  80                 'Listredirects' => 'ListredirectsPage',
  81                 'PagesWithProp' => 'SpecialPagesWithProp',
  82                 'TrackingCategories' => 'SpecialTrackingCategories',
  83
  84                 // Login/create account
  85                 'Userlogin' => 'LoginForm',
  86                 'CreateAccount' => 'SpecialCreateAccount',
  87
  88                 // Users and rights
  89                 'Block' => 'SpecialBlock',
  90                 'Unblock' => 'SpecialUnblock',
  91                 'BlockList' => 'SpecialBlockList',
  92                 'ChangePassword' => 'SpecialChangePassword',
  93                 'BotPasswords' => 'SpecialBotPasswords',
  94                 'PasswordReset' => 'SpecialPasswordReset',
  95                 'DeletedContributions' => 'DeletedContributionsPage',
  96                 'Preferences' => 'SpecialPreferences',
  97                 'ResetTokens' => 'SpecialResetTokens',
  98                 'Contributions' => 'SpecialContributions',
  99                 'Listgrouprights' => 'SpecialListGroupRights',
 100                 'Listgrants' => 'SpecialListGrants',
 101                 'Listusers' => 'SpecialListUsers',
 102                 'Listadmins' => 'SpecialListAdmins',
 103                 'Listbots' => 'SpecialListBots',
 104                 'Userrights' => 'UserrightsPage',
 105                 'EditWatchlist' => 'SpecialEditWatchlist',
 106
 107                 // Recent changes and logs
 108                 'Newimages' => 'SpecialNewFiles',
 109                 'Log' => 'SpecialLog',
 110                 'Watchlist' => 'SpecialWatchlist',
 111                 'Newpages' => 'SpecialNewpages',
 112                 'Recentchanges' => 'SpecialRecentChanges',
 113                 'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 114                 'Tags' => 'SpecialTags',
 115
 116                 // Media reports and uploads
 117                 'Listfiles' => 'SpecialListFiles',
 118                 'Filepath' => 'SpecialFilepath',
 119                 'MediaStatistics' => 'MediaStatisticsPage',
 120                 'MIMEsearch' => 'MIMEsearchPage',
 121                 'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 122                 'Upload' => 'SpecialUpload',
 123                 'UploadStash' => 'SpecialUploadStash',
 124                 'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 125
 126                 // Data and tools
 127                 'ApiSandbox' => 'SpecialApiSandbox',
 128                 'Statistics' => 'SpecialStatistics',
 129                 'Allmessages' => 'SpecialAllMessages',
 130                 'Version' => 'SpecialVersion',
 131                 'Lockdb' => 'SpecialLockdb',
 132                 'Unlockdb' => 'SpecialUnlockdb',
 133
 134                 // Redirecting special pages
 135                 'LinkSearch' => 'LinkSearchPage',
 136                 'Randompage' => 'RandomPage',
 137                 'RandomInCategory' => 'SpecialRandomInCategory',
 138                 'Randomredirect' => 'SpecialRandomredirect',
 139                 'Randomrootpage' => 'SpecialRandomrootpage',
 140
 141                 // High use pages
 142                 'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 143                 'Mostimages' => 'MostimagesPage',
 144                 'Mostinterwikis' => 'MostinterwikisPage',
 145                 'Mostlinked' => 'MostlinkedPage',
 146                 'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 147                 'Mostcategories' => 'MostcategoriesPage',
 148                 'Mostrevisions' => 'MostrevisionsPage',
 149
 150                 // Page tools
 151                 'ComparePages' => 'SpecialComparePages',
 152                 'Export' => 'SpecialExport',
 153                 'Import' => 'SpecialImport',
 154                 'Undelete' => 'SpecialUndelete',
 155                 'Whatlinkshere' => 'SpecialWhatLinksHere',
 156                 'MergeHistory' => 'SpecialMergeHistory',
 157                 'ExpandTemplates' => 'SpecialExpandTemplates',
 158
 159                 // Other
 160                 'Booksources' => 'SpecialBookSources',
 161
 162                 // Unlisted / redirects
 163                 'ApiHelp' => 'SpecialApiHelp',
 164                 'Blankpage' => 'SpecialBlankpage',
 165                 'Diff' => 'SpecialDiff',
 166                 'EditTags' => 'SpecialEditTags',
 167                 'Emailuser' => 'SpecialEmailUser',
 168                 'Movepage' => 'MovePageForm',
 169                 'Mycontributions' => 'SpecialMycontributions',
 170                 'MyLanguage' => 'SpecialMyLanguage',
 171                 'Mypage' => 'SpecialMypage',
 172                 'Mytalk' => 'SpecialMytalk',
 173                 'Myuploads' => 'SpecialMyuploads',
 174                 'AllMyUploads' => 'SpecialAllMyUploads',
 175                 'PermanentLink' => 'SpecialPermanentLink',
 176                 'Redirect' => 'SpecialRedirect',
 177                 'Revisiondelete' => 'SpecialRevisionDelete',
 178                 'RunJobs' => 'SpecialRunJobs',
 179                 'Specialpages' => 'SpecialSpecialpages',
 180                 'Userlogout' => 'SpecialUserlogout',
 181         ];
 182
 183         private static $list;
 184         private static $aliases;
 185
 186         /**
 187          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 188          * the internal list has already been initialized, e.g. during testing.
 189          */
 190         public static function resetList() {
 191                 self::$list = null;
 192                 self::$aliases = null;
 193         }
 194
 195         /**
 196          * Returns a list of canonical special page names.
 197          * May be used to iterate over all registered special pages.
 198          *
 199          * @return string[]
 200          */
 201         public static function getNames() {
 202                 return array_keys( self::getPageList() );
 203         }
 204
 205         /**
 206          * Get the special page list as an array
 207          *
 208          * @deprecated since 1.24, use getNames() instead.
 209          * @return array
 210          */
 211         public static function getList() {
 212                 wfDeprecated( __FUNCTION__, '1.24' );
 213                 return self::getPageList();
 214         }
 215
 216         /**
 217          * Get the special page list as an array
 218          *
 219          * @return array
 220          */
 221         private static function getPageList() {
 222                 global $wgSpecialPages;
 223                 global $wgDisableInternalSearch, $wgEmailAuthentication;
 224                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 225                 global $wgPageLanguageUseDB, $wgContentHandlerUseDB;
 226
 227                 if ( !is_array( self::$list ) ) {
 228
 229                         self::$list = self::$coreList;
 230
 231                         if ( !$wgDisableInternalSearch ) {
 232                                 self::$list['Search'] = 'SpecialSearch';
 233                         }
 234
 235                         if ( $wgEmailAuthentication ) {
 236                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 237                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 238                         }
 239
 240                         if ( $wgEnableEmail ) {
 241                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 242                         }
 243
 244                         if ( $wgEnableJavaScriptTest ) {
 245                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 246                         }
 247
 248                         if ( $wgPageLanguageUseDB ) {
 249                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 250                         }
 251                         if ( $wgContentHandlerUseDB ) {
 252                                 self::$list['ChangeContentModel'] = 'SpecialChangeContentModel';
 253                         }
 254
 255                         self::$list['Activeusers'] = 'SpecialActiveUsers';
 256
 257                         // Add extension special pages
 258                         self::$list = array_merge( self::$list, $wgSpecialPages );
 259
 260                         // This hook can be used to disable unwanted core special pages
 261                         // or conditionally register special pages.
 262                         Hooks::run( 'SpecialPage_initList', [ &self::$list ] );
 263
 264                 }
 265
 266                 return self::$list;
 267         }
 268
 269         /**
 270          * Initialise and return the list of special page aliases. Returns an array where
 271          * the key is an alias, and the value is the canonical name of the special page.
 272          * All registered special pages are guaranteed to map to themselves.
 273          * @return array
 274          */
 275         private static function getAliasList() {
 276                 if ( is_null( self::$aliases ) ) {
 277                         global $wgContLang;
 278                         $aliases = $wgContLang->getSpecialPageAliases();
 279                         $pageList = self::getPageList();
 280
 281                         self::$aliases = [];
 282                         $keepAlias = [];
 283
 284                         // Force every canonical name to be an alias for itself.
 285                         foreach ( $pageList as $name => $stuff ) {
 286                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 287                                 self::$aliases[$caseFoldedAlias] = $name;
 288                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 289                         }
 290
 291                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 292                         if ( is_array( $aliases ) ) {
 293                                 foreach ( $aliases as $realName => $aliasList ) {
 294                                         $aliasList = array_values( $aliasList );
 295                                         foreach ( $aliasList as $i => $alias ) {
 296                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 297
 298                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 299                                                         $realName === self::$aliases[$caseFoldedAlias]
 300                                                 ) {
 301                                                         // Ignore same-realName conflicts
 302                                                         continue;
 303                                                 }
 304
 305                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 306                                                         self::$aliases[$caseFoldedAlias] = $realName;
 307                                                         if ( !$i ) {
 308                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 309                                                         }
 310                                                 } elseif ( !$i ) {
 311                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 312                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 313                                                                 self::$aliases[$caseFoldedAlias]
 314                                                         );
 315                                                 }
 316                                         }
 317                                 }
 318                         }
 319                 }
 320
 321                 return self::$aliases;
 322         }
 323
 324         /**
 325          * Given a special page name with a possible subpage, return an array
 326          * where the first element is the special page name and the second is the
 327          * subpage.
 328          *
 329          * @param string $alias
 330          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 331          */
 332         public static function resolveAlias( $alias ) {
 333                 global $wgContLang;
 334                 $bits = explode( '/', $alias, 2 );
 335
 336                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 337                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 338                 $aliases = self::getAliasList();
 339                 if ( isset( $aliases[$caseFoldedAlias] ) ) {
 340                         $name = $aliases[$caseFoldedAlias];
 341                 } else {
 342                         return [ null, null ];
 343                 }
 344
 345                 if ( !isset( $bits[1] ) ) { // bug 2087
 346                         $par = null;
 347                 } else {
 348                         $par = $bits[1];
 349                 }
 350
 351                 return [ $name, $par ];
 352         }
 353
 354         /**
 355          * Check if a given name exist as a special page or as a special page alias
 356          *
 357          * @param string $name Name of a special page
 358          * @return bool True if a special page exists with this name
 359          */
 360         public static function exists( $name ) {
 361                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 362
 363                 $specialPageList = self::getPageList();
 364                 return isset( $specialPageList[$title] );
 365         }
 366
 367         /**
 368          * Find the object with a given name and return it (or NULL)
 369          *
 370          * @param string $name Special page name, may be localised and/or an alias
 371          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 372          */
 373         public static function getPage( $name ) {
 374                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 375
 376                 $specialPageList = self::getPageList();
 377
 378                 if ( isset( $specialPageList[$realName] ) ) {
 379                         $rec = $specialPageList[$realName];
 380
 381                         if ( is_callable( $rec ) ) {
 382                                 // Use callback to instantiate the special page
 383                                 $page = call_user_func( $rec );
 384                         } elseif ( is_string( $rec ) ) {
 385                                 $className = $rec;
 386                                 $page = new $className;
 387                         } elseif ( is_array( $rec ) ) {
 388                                 $className = array_shift( $rec );
 389                                 // @deprecated, officially since 1.18, unofficially since forever
 390                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 391                                         "define a subclass of SpecialPage instead.", '1.18' );
 392                                 $page = ObjectFactory::getObjectFromSpec( [
 393                                         'class' => $className,
 394                                         'args' => $rec,
 395                                         'closure_expansion' => false,
 396                                 ] );
 397                         } elseif ( $rec instanceof SpecialPage ) {
 398                                 $page = $rec; // XXX: we should deep clone here
 399                         } else {
 400                                 $page = null;
 401                         }
 402
 403                         if ( $page instanceof SpecialPage ) {
 404                                 return $page;
 405                         } else {
 406                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 407                                 // nor a special page object. Give up.
 408                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 409                                 return null;
 410                         }
 411
 412                 } else {
 413                         return null;
 414                 }
 415         }
 416
 417         /**
 418          * Return categorised listable special pages which are available
 419          * for the current user, and everyone.
 420          *
 421          * @param User $user User object to check permissions, $wgUser will be used
 422          *        if not provided
 423          * @return array ( string => Specialpage )
 424          */
 425         public static function getUsablePages( User $user = null ) {
 426                 $pages = [];
 427                 if ( $user === null ) {
 428                         global $wgUser;
 429                         $user = $wgUser;
 430                 }
 431                 foreach ( self::getPageList() as $name => $rec ) {
 432                         $page = self::getPage( $name );
 433                         if ( $page ) { // not null
 434                                 $page->setContext( RequestContext::getMain() );
 435                                 if ( $page->isListed()
 436                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 437                                 ) {
 438                                         $pages[$name] = $page;
 439                                 }
 440                         }
 441                 }
 442
 443                 return $pages;
 444         }
 445
 446         /**
 447          * Return categorised listable special pages for all users
 448          *
 449          * @return array ( string => Specialpage )
 450          */
 451         public static function getRegularPages() {
 452                 $pages = [];
 453                 foreach ( self::getPageList() as $name => $rec ) {
 454                         $page = self::getPage( $name );
 455                         if ( $page->isListed() && !$page->isRestricted() ) {
 456                                 $pages[$name] = $page;
 457                         }
 458                 }
 459
 460                 return $pages;
 461         }
 462
 463         /**
 464          * Return categorised listable special pages which are available
 465          * for the current user, but not for everyone
 466          *
 467          * @param User|null $user User object to use or null for $wgUser
 468          * @return array ( string => Specialpage )
 469          */
 470         public static function getRestrictedPages( User $user = null ) {
 471                 $pages = [];
 472                 if ( $user === null ) {
 473                         global $wgUser;
 474                         $user = $wgUser;
 475                 }
 476                 foreach ( self::getPageList() as $name => $rec ) {
 477                         $page = self::getPage( $name );
 478                         if (
 479                                 $page->isListed()
 480                                 && $page->isRestricted()
 481                                 && $page->userCanExecute( $user )
 482                         ) {
 483                                 $pages[$name] = $page;
 484                         }
 485                 }
 486
 487                 return $pages;
 488         }
 489
 490         /**
 491          * Execute a special page path.
 492          * The path may contain parameters, e.g. Special:Name/Params
 493          * Extracts the special page name and call the execute method, passing the parameters
 494          *
 495          * Returns a title object if the page is redirected, false if there was no such special
 496          * page, and true if it was successful.
 497          *
 498          * @param Title $title
 499          * @param IContextSource $context
 500          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 501          *
 502          * @return bool
 503          */
 504         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 505                 // @todo FIXME: Redirects broken due to this call
 506                 $bits = explode( '/', $title->getDBkey(), 2 );
 507                 $name = $bits[0];
 508                 if ( !isset( $bits[1] ) ) { // bug 2087
 509                         $par = null;
 510                 } else {
 511                         $par = $bits[1];
 512                 }
 513
 514                 $page = self::getPage( $name );
 515                 if ( !$page ) {
 516                         $context->getOutput()->setArticleRelated( false );
 517                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 518
 519                         global $wgSend404Code;
 520                         if ( $wgSend404Code ) {
 521                                 $context->getOutput()->setStatusCode( 404 );
 522                         }
 523
 524                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 525
 526                         return false;
 527                 }
 528
 529                 if ( !$including ) {
 530                         // Narrow DB query expectations for this HTTP request
 531                         $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
 532                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 533                         if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
 534                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 535                         }
 536                 }
 537
 538                 // Page exists, set the context
 539                 $page->setContext( $context );
 540
 541                 if ( !$including ) {
 542                         // Redirect to canonical alias for GET commands
 543                         // Not for POST, we'd lose the post data, so it's best to just distribute
 544                         // the request. Such POST requests are possible for old extensions that
 545                         // generate self-links without being aware that their default name has
 546                         // changed.
 547                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 548                                 $query = $context->getRequest()->getQueryValues();
 549                                 unset( $query['title'] );
 550                                 $title = $page->getPageTitle( $par );
 551                                 $url = $title->getFullURL( $query );
 552                                 $context->getOutput()->redirect( $url );
 553
 554                                 return $title;
 555                         } else {
 556                                 $context->setTitle( $page->getPageTitle( $par ) );
 557                         }
 558                 } elseif ( !$page->isIncludable() ) {
 559                         return false;
 560                 }
 561
 562                 $page->including( $including );
 563
 564                 // Execute special page
 565                 $page->run( $par );
 566
 567                 return true;
 568         }
 569
 570         /**
 571          * Just like executePath() but will override global variables and execute
 572          * the page in "inclusion" mode. Returns true if the execution was
 573          * successful or false if there was no such special page, or a title object
 574          * if it was a redirect.
 575          *
 576          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 577          * variables so that the special page will get the context it'd expect on a
 578          * normal request, and then restores them to their previous values after.
 579          *
 580          * @param Title $title
 581          * @param IContextSource $context
 582          * @return string HTML fragment
 583          */
 584         public static function capturePath( Title $title, IContextSource $context ) {
 585                 global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
 586                 $main = RequestContext::getMain();
 587
 588                 // Save current globals and main context
 589                 $glob = [
 590                         'title' => $wgTitle,
 591                         'output' => $wgOut,
 592                         'request' => $wgRequest,
 593                         'user' => $wgUser,
 594                         'language' => $wgLang,
 595                 ];
 596                 $ctx = [
 597                         'title' => $main->getTitle(),
 598                         'output' => $main->getOutput(),
 599                         'request' => $main->getRequest(),
 600                         'user' => $main->getUser(),
 601                         'language' => $main->getLanguage(),
 602                 ];
 603
 604                 // Override
 605                 $wgTitle = $title;
 606                 $wgOut = $context->getOutput();
 607                 $wgRequest = $context->getRequest();
 608                 $wgUser = $context->getUser();
 609                 $wgLang = $context->getLanguage();
 610                 $main->setTitle( $title );
 611                 $main->setOutput( $context->getOutput() );
 612                 $main->setRequest( $context->getRequest() );
 613                 $main->setUser( $context->getUser() );
 614                 $main->setLanguage( $context->getLanguage() );
 615
 616                 // The useful part
 617                 $ret = self::executePath( $title, $context, true );
 618
 619                 // Restore old globals and context
 620                 $wgTitle = $glob['title'];
 621                 $wgOut = $glob['output'];
 622                 $wgRequest = $glob['request'];
 623                 $wgUser = $glob['user'];
 624                 $wgLang = $glob['language'];
 625                 $main->setTitle( $ctx['title'] );
 626                 $main->setOutput( $ctx['output'] );
 627                 $main->setRequest( $ctx['request'] );
 628                 $main->setUser( $ctx['user'] );
 629                 $main->setLanguage( $ctx['language'] );
 630
 631                 return $ret;
 632         }
 633
 634         /**
 635          * Get the local name for a specified canonical name
 636          *
 637          * @param string $name
 638          * @param string|bool $subpage
 639          * @return string
 640          */
 641         public static function getLocalNameFor( $name, $subpage = false ) {
 642                 global $wgContLang;
 643                 $aliases = $wgContLang->getSpecialPageAliases();
 644                 $aliasList = self::getAliasList();
 645
 646                 // Find the first alias that maps back to $name
 647                 if ( isset( $aliases[$name] ) ) {
 648                         $found = false;
 649                         foreach ( $aliases[$name] as $alias ) {
 650                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 651                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 652                                 if ( isset( $aliasList[$caseFoldedAlias] ) &&
 653                                         $aliasList[$caseFoldedAlias] === $name
 654                                 ) {
 655                                         $name = $alias;
 656                                         $found = true;
 657                                         break;
 658                                 }
 659                         }
 660                         if ( !$found ) {
 661                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 662                                         "It seems all defined aliases conflict?" );
 663                         }
 664                 } else {
 665                         // Check if someone misspelled the correct casing
 666                         if ( is_array( $aliases ) ) {
 667                                 foreach ( $aliases as $n => $values ) {
 668                                         if ( strcasecmp( $name, $n ) === 0 ) {
 669                                                 wfWarn( "Found alias defined for $n when searching for " .
 670                                                         "special page aliases for $name. Case mismatch?" );
 671                                                 return self::getLocalNameFor( $n, $subpage );
 672                                         }
 673                                 }
 674                         }
 675
 676                         wfWarn( "Did not find alias for special page '$name'. " .
 677                                 "Perhaps no aliases are defined for it?" );
 678                 }
 679
 680                 if ( $subpage !== false && !is_null( $subpage ) ) {
 681                         $name = "$name/$subpage";
 682                 }
 683
 684                 return $wgContLang->ucfirst( $name );
 685         }
 686
 687         /**
 688          * Get a title for a given alias
 689          *
 690          * @param string $alias
 691          * @return Title|null Title or null if there is no such alias
 692          */
 693         public static function getTitleForAlias( $alias ) {
 694                 list( $name, $subpage ) = self::resolveAlias( $alias );
 695                 if ( $name != null ) {
 696                         return SpecialPage::getTitleFor( $name, $subpage );
 697                 } else {
 698                         return null;
 699                 }
 700         }
 701 }