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 = array(
  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                 'PasswordReset' => 'SpecialPasswordReset',
  94                 'DeletedContributions' => 'DeletedContributionsPage',
  95                 'Preferences' => 'SpecialPreferences',
  96                 'ResetTokens' => 'SpecialResetTokens',
  97                 'Contributions' => 'SpecialContributions',
  98                 'Listgrouprights' => 'SpecialListGroupRights',
  99                 'Listusers' => 'SpecialListUsers',
 100                 'Listadmins' => 'SpecialListAdmins',
 101                 'Listbots' => 'SpecialListBots',
 102                 'Userrights' => 'UserrightsPage',
 103                 'EditWatchlist' => 'SpecialEditWatchlist',
 104
 105                 // Recent changes and logs
 106                 'Newimages' => 'SpecialNewFiles',
 107                 'Log' => 'SpecialLog',
 108                 'Watchlist' => 'SpecialWatchlist',
 109                 'Newpages' => 'SpecialNewpages',
 110                 'Recentchanges' => 'SpecialRecentChanges',
 111                 'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 112                 'Tags' => 'SpecialTags',
 113
 114                 // Media reports and uploads
 115                 'Listfiles' => 'SpecialListFiles',
 116                 'Filepath' => 'SpecialFilepath',
 117                 'MediaStatistics' => 'MediaStatisticsPage',
 118                 'MIMEsearch' => 'MIMEsearchPage',
 119                 'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 120                 'Upload' => 'SpecialUpload',
 121                 'UploadStash' => 'SpecialUploadStash',
 122                 'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 123
 124                 // Data and tools
 125                 'Statistics' => 'SpecialStatistics',
 126                 'Allmessages' => 'SpecialAllMessages',
 127                 'Version' => 'SpecialVersion',
 128                 'Lockdb' => 'SpecialLockdb',
 129                 'Unlockdb' => 'SpecialUnlockdb',
 130
 131                 // Redirecting special pages
 132                 'LinkSearch' => 'LinkSearchPage',
 133                 'Randompage' => 'RandomPage',
 134                 'RandomInCategory' => 'SpecialRandomInCategory',
 135                 'Randomredirect' => 'SpecialRandomredirect',
 136
 137                 // High use pages
 138                 'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 139                 'Mostimages' => 'MostimagesPage',
 140                 'Mostinterwikis' => 'MostinterwikisPage',
 141                 'Mostlinked' => 'MostlinkedPage',
 142                 'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 143                 'Mostcategories' => 'MostcategoriesPage',
 144                 'Mostrevisions' => 'MostrevisionsPage',
 145
 146                 // Page tools
 147                 'ComparePages' => 'SpecialComparePages',
 148                 'Export' => 'SpecialExport',
 149                 'Import' => 'SpecialImport',
 150                 'Undelete' => 'SpecialUndelete',
 151                 'Whatlinkshere' => 'SpecialWhatLinksHere',
 152                 'MergeHistory' => 'SpecialMergeHistory',
 153                 'ExpandTemplates' => 'SpecialExpandTemplates',
 154
 155                 // Other
 156                 'Booksources' => 'SpecialBookSources',
 157
 158                 // Unlisted / redirects
 159                 'ApiHelp' => 'SpecialApiHelp',
 160                 'Blankpage' => 'SpecialBlankpage',
 161                 'Diff' => 'SpecialDiff',
 162                 'EditTags' => 'SpecialEditTags',
 163                 'Emailuser' => 'SpecialEmailUser',
 164                 'Movepage' => 'MovePageForm',
 165                 'Mycontributions' => 'SpecialMycontributions',
 166                 'MyLanguage' => 'SpecialMyLanguage',
 167                 'Mypage' => 'SpecialMypage',
 168                 'Mytalk' => 'SpecialMytalk',
 169                 'Myuploads' => 'SpecialMyuploads',
 170                 'AllMyUploads' => 'SpecialAllMyUploads',
 171                 'PermanentLink' => 'SpecialPermanentLink',
 172                 'Redirect' => 'SpecialRedirect',
 173                 'Revisiondelete' => 'SpecialRevisionDelete',
 174                 'RunJobs' => 'SpecialRunJobs',
 175                 'Specialpages' => 'SpecialSpecialpages',
 176                 'Userlogout' => 'SpecialUserlogout',
 177         );
 178
 179         private static $list;
 180         private static $aliases;
 181
 182         /**
 183          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 184          * the internal list has already been initialized, e.g. during testing.
 185          */
 186         public static function resetList() {
 187                 self::$list = null;
 188                 self::$aliases = null;
 189         }
 190
 191         /**
 192          * Returns a list of canonical special page names.
 193          * May be used to iterate over all registered special pages.
 194          *
 195          * @return string[]
 196          */
 197         public static function getNames() {
 198                 return array_keys( self::getPageList() );
 199         }
 200
 201         /**
 202          * Get the special page list as an array
 203          *
 204          * @deprecated since 1.24, use getNames() instead.
 205          * @return array
 206          */
 207         public static function getList() {
 208                 wfDeprecated( __FUNCTION__, '1.24' );
 209                 return self::getPageList();
 210         }
 211
 212         /**
 213          * Get the special page list as an array
 214          *
 215          * @return array
 216          */
 217         private static function getPageList() {
 218                 global $wgSpecialPages;
 219                 global $wgDisableInternalSearch, $wgEmailAuthentication;
 220                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 221                 global $wgPageLanguageUseDB;
 222
 223                 if ( !is_array( self::$list ) ) {
 224
 225                         self::$list = self::$coreList;
 226
 227                         if ( !$wgDisableInternalSearch ) {
 228                                 self::$list['Search'] = 'SpecialSearch';
 229                         }
 230
 231                         if ( $wgEmailAuthentication ) {
 232                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 233                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 234                         }
 235
 236                         if ( $wgEnableEmail ) {
 237                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 238                         }
 239
 240                         if ( $wgEnableJavaScriptTest ) {
 241                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 242                         }
 243
 244                         if ( $wgPageLanguageUseDB ) {
 245                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 246                         }
 247
 248                         self::$list['Activeusers'] = 'SpecialActiveUsers';
 249
 250                         // Add extension special pages
 251                         self::$list = array_merge( self::$list, $wgSpecialPages );
 252
 253                         // This hook can be used to disable unwanted core special pages
 254                         // or conditionally register special pages.
 255                         Hooks::run( 'SpecialPage_initList', array( &self::$list ) );
 256
 257                 }
 258
 259                 return self::$list;
 260         }
 261
 262         /**
 263          * Initialise and return the list of special page aliases.  Returns an object with
 264          * properties which can be accessed $obj->pagename - each property name is an
 265          * alias, with the value being the canonical name of the special page. All
 266          * registered special pages are guaranteed to map to themselves.
 267          * @return object
 268          */
 269         private static function getAliasListObject() {
 270                 if ( !is_object( self::$aliases ) ) {
 271                         global $wgContLang;
 272                         $aliases = $wgContLang->getSpecialPageAliases();
 273                         $pageList = self::getPageList();
 274
 275                         self::$aliases = array();
 276                         $keepAlias = array();
 277
 278                         // Force every canonical name to be an alias for itself.
 279                         foreach ( $pageList as $name => $stuff ) {
 280                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 281                                 self::$aliases[$caseFoldedAlias] = $name;
 282                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 283                         }
 284
 285                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 286                         if ( is_array( $aliases ) ) {
 287                                 foreach ( $aliases as $realName => $aliasList ) {
 288                                         $aliasList = array_values( $aliasList );
 289                                         foreach ( $aliasList as $i => $alias ) {
 290                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 291
 292                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 293                                                         $realName === self::$aliases[$caseFoldedAlias]
 294                                                 ) {
 295                                                         // Ignore same-realName conflicts
 296                                                         continue;
 297                                                 }
 298
 299                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 300                                                         self::$aliases[$caseFoldedAlias] = $realName;
 301                                                         if ( !$i ) {
 302                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 303                                                         }
 304                                                 } elseif ( !$i ) {
 305                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 306                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 307                                                                 self::$aliases[$caseFoldedAlias]
 308                                                         );
 309                                                 }
 310                                         }
 311                                 }
 312                         }
 313
 314                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 315                         self::$aliases = (object)self::$aliases;
 316                 }
 317
 318                 return self::$aliases;
 319         }
 320
 321         /**
 322          * Given a special page name with a possible subpage, return an array
 323          * where the first element is the special page name and the second is the
 324          * subpage.
 325          *
 326          * @param string $alias
 327          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 328          */
 329         public static function resolveAlias( $alias ) {
 330                 global $wgContLang;
 331                 $bits = explode( '/', $alias, 2 );
 332
 333                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 334                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 335                 if ( isset( self::getAliasListObject()->$caseFoldedAlias ) ) {
 336                         $name = self::getAliasListObject()->$caseFoldedAlias;
 337                 } else {
 338                         return array( null, null );
 339                 }
 340
 341                 if ( !isset( $bits[1] ) ) { // bug 2087
 342                         $par = null;
 343                 } else {
 344                         $par = $bits[1];
 345                 }
 346
 347                 return array( $name, $par );
 348         }
 349
 350         /**
 351          * Add a page to a certain display group for Special:SpecialPages
 352          *
 353          * @param SpecialPage|string $page
 354          * @param string $group
 355          * @deprecated since 1.21 Override SpecialPage::getGroupName
 356          */
 357         public static function setGroup( $page, $group ) {
 358                 wfDeprecated( __METHOD__, '1.21' );
 359
 360                 global $wgSpecialPageGroups;
 361                 $name = is_object( $page ) ? $page->getName() : $page;
 362                 $wgSpecialPageGroups[$name] = $group;
 363         }
 364
 365         /**
 366          * Get the group that the special page belongs in on Special:SpecialPage
 367          *
 368          * @param SpecialPage $page
 369          * @return string
 370          * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
 371          */
 372         public static function getGroup( &$page ) {
 373                 wfDeprecated( __METHOD__, '1.21' );
 374
 375                 return $page->getFinalGroupName();
 376         }
 377
 378         /**
 379          * Check if a given name exist as a special page or as a special page alias
 380          *
 381          * @param string $name Name of a special page
 382          * @return bool True if a special page exists with this name
 383          */
 384         public static function exists( $name ) {
 385                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 386
 387                 $specialPageList = self::getPageList();
 388                 return isset( $specialPageList[$title] );
 389         }
 390
 391         /**
 392          * Find the object with a given name and return it (or NULL)
 393          *
 394          * @param string $name Special page name, may be localised and/or an alias
 395          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 396          */
 397         public static function getPage( $name ) {
 398                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 399
 400                 $specialPageList = self::getPageList();
 401
 402                 if ( isset( $specialPageList[$realName] ) ) {
 403                         $rec = $specialPageList[$realName];
 404
 405                         if ( is_callable( $rec ) ) {
 406                                 // Use callback to instantiate the special page
 407                                 $page = call_user_func( $rec );
 408                         } elseif ( is_string( $rec ) ) {
 409                                 $className = $rec;
 410                                 $page = new $className;
 411                         } elseif ( is_array( $rec ) ) {
 412                                 $className = array_shift( $rec );
 413                                 // @deprecated, officially since 1.18, unofficially since forever
 414                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 415                                         "define a subclass of SpecialPage instead.", '1.18' );
 416                                 $page = ObjectFactory::getObjectFromSpec( array(
 417                                         'class' => $className,
 418                                         'args' => $rec,
 419                                         'closure_expansion' => false,
 420                                 ) );
 421                         } elseif ( $rec instanceof SpecialPage ) {
 422                                 $page = $rec; //XXX: we should deep clone here
 423                         } else {
 424                                 $page = null;
 425                         }
 426
 427                         if ( $page instanceof SpecialPage ) {
 428                                 return $page;
 429                         } else {
 430                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 431                                 // nor a special page object. Give up.
 432                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 433                                 return null;
 434                         }
 435
 436                 } else {
 437                         return null;
 438                 }
 439         }
 440
 441         /**
 442          * Return categorised listable special pages which are available
 443          * for the current user, and everyone.
 444          *
 445          * @param User $user User object to check permissions, $wgUser will be used
 446          *        if not provided
 447          * @return array ( string => Specialpage )
 448          */
 449         public static function getUsablePages( User $user = null ) {
 450                 $pages = array();
 451                 if ( $user === null ) {
 452                         global $wgUser;
 453                         $user = $wgUser;
 454                 }
 455                 foreach ( self::getPageList() as $name => $rec ) {
 456                         $page = self::getPage( $name );
 457                         if ( $page ) { // not null
 458                                 $page->setContext( RequestContext::getMain() );
 459                                 if ( $page->isListed()
 460                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 461                                 ) {
 462                                         $pages[$name] = $page;
 463                                 }
 464                         }
 465                 }
 466
 467                 return $pages;
 468         }
 469
 470         /**
 471          * Return categorised listable special pages for all users
 472          *
 473          * @return array ( string => Specialpage )
 474          */
 475         public static function getRegularPages() {
 476                 $pages = array();
 477                 foreach ( self::getPageList() as $name => $rec ) {
 478                         $page = self::getPage( $name );
 479                         if ( $page->isListed() && !$page->isRestricted() ) {
 480                                 $pages[$name] = $page;
 481                         }
 482                 }
 483
 484                 return $pages;
 485         }
 486
 487         /**
 488          * Return categorised listable special pages which are available
 489          * for the current user, but not for everyone
 490          *
 491          * @param User|null $user User object to use or null for $wgUser
 492          * @return array ( string => Specialpage )
 493          */
 494         public static function getRestrictedPages( User $user = null ) {
 495                 $pages = array();
 496                 if ( $user === null ) {
 497                         global $wgUser;
 498                         $user = $wgUser;
 499                 }
 500                 foreach ( self::getPageList() as $name => $rec ) {
 501                         $page = self::getPage( $name );
 502                         if (
 503                                 $page->isListed()
 504                                 && $page->isRestricted()
 505                                 && $page->userCanExecute( $user )
 506                         ) {
 507                                 $pages[$name] = $page;
 508                         }
 509                 }
 510
 511                 return $pages;
 512         }
 513
 514         /**
 515          * Execute a special page path.
 516          * The path may contain parameters, e.g. Special:Name/Params
 517          * Extracts the special page name and call the execute method, passing the parameters
 518          *
 519          * Returns a title object if the page is redirected, false if there was no such special
 520          * page, and true if it was successful.
 521          *
 522          * @param Title $title
 523          * @param IContextSource $context
 524          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 525          *
 526          * @return bool
 527          */
 528         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 529
 530                 // @todo FIXME: Redirects broken due to this call
 531                 $bits = explode( '/', $title->getDBkey(), 2 );
 532                 $name = $bits[0];
 533                 if ( !isset( $bits[1] ) ) { // bug 2087
 534                         $par = null;
 535                 } else {
 536                         $par = $bits[1];
 537                 }
 538                 $page = self::getPage( $name );
 539                 // Nonexistent?
 540                 if ( !$page ) {
 541                         $context->getOutput()->setArticleRelated( false );
 542                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 543
 544                         global $wgSend404Code;
 545                         if ( $wgSend404Code ) {
 546                                 $context->getOutput()->setStatusCode( 404 );
 547                         }
 548
 549                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 550
 551                         return false;
 552                 }
 553
 554                 // Page exists, set the context
 555                 $page->setContext( $context );
 556
 557                 if ( !$including ) {
 558                         // Redirect to canonical alias for GET commands
 559                         // Not for POST, we'd lose the post data, so it's best to just distribute
 560                         // the request. Such POST requests are possible for old extensions that
 561                         // generate self-links without being aware that their default name has
 562                         // changed.
 563                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 564                                 $query = $context->getRequest()->getQueryValues();
 565                                 unset( $query['title'] );
 566                                 $title = $page->getPageTitle( $par );
 567                                 $url = $title->getFullURL( $query );
 568                                 $context->getOutput()->redirect( $url );
 569
 570                                 return $title;
 571                         } else {
 572                                 $context->setTitle( $page->getPageTitle( $par ) );
 573                         }
 574                 } elseif ( !$page->isIncludable() ) {
 575                         return false;
 576                 }
 577
 578                 $page->including( $including );
 579
 580                 // Execute special page
 581                 $page->run( $par );
 582
 583                 return true;
 584         }
 585
 586         /**
 587          * Just like executePath() but will override global variables and execute
 588          * the page in "inclusion" mode. Returns true if the execution was
 589          * successful or false if there was no such special page, or a title object
 590          * if it was a redirect.
 591          *
 592          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 593          * variables so that the special page will get the context it'd expect on a
 594          * normal request, and then restores them to their previous values after.
 595          *
 596          * @param Title $title
 597          * @param IContextSource $context
 598          * @return string HTML fragment
 599          */
 600         public static function capturePath( Title $title, IContextSource $context ) {
 601                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 602
 603                 // Save current globals
 604                 $oldTitle = $wgTitle;
 605                 $oldOut = $wgOut;
 606                 $oldRequest = $wgRequest;
 607                 $oldUser = $wgUser;
 608                 $oldLang = $wgLang;
 609
 610                 // Set the globals to the current context
 611                 $wgTitle = $title;
 612                 $wgOut = $context->getOutput();
 613                 $wgRequest = $context->getRequest();
 614                 $wgUser = $context->getUser();
 615                 $wgLang = $context->getLanguage();
 616
 617                 // The useful part
 618                 $ret = self::executePath( $title, $context, true );
 619
 620                 // And restore the old globals
 621                 $wgTitle = $oldTitle;
 622                 $wgOut = $oldOut;
 623                 $wgRequest = $oldRequest;
 624                 $wgUser = $oldUser;
 625                 $wgLang = $oldLang;
 626
 627                 return $ret;
 628         }
 629
 630         /**
 631          * Get the local name for a specified canonical name
 632          *
 633          * @param string $name
 634          * @param string|bool $subpage
 635          * @return string
 636          */
 637         public static function getLocalNameFor( $name, $subpage = false ) {
 638                 global $wgContLang;
 639                 $aliases = $wgContLang->getSpecialPageAliases();
 640                 $aliasList = self::getAliasListObject();
 641
 642                 // Find the first alias that maps back to $name
 643                 if ( isset( $aliases[$name] ) ) {
 644                         $found = false;
 645                         foreach ( $aliases[$name] as $alias ) {
 646                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 647                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 648                                 if ( isset( $aliasList->$caseFoldedAlias ) &&
 649                                         $aliasList->$caseFoldedAlias === $name
 650                                 ) {
 651                                         $name = $alias;
 652                                         $found = true;
 653                                         break;
 654                                 }
 655                         }
 656                         if ( !$found ) {
 657                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 658                                         "It seems all defined aliases conflict?" );
 659                         }
 660                 } else {
 661                         // Check if someone misspelled the correct casing
 662                         if ( is_array( $aliases ) ) {
 663                                 foreach ( $aliases as $n => $values ) {
 664                                         if ( strcasecmp( $name, $n ) === 0 ) {
 665                                                 wfWarn( "Found alias defined for $n when searching for " .
 666                                                         "special page aliases for $name. Case mismatch?" );
 667                                                 return self::getLocalNameFor( $n, $subpage );
 668                                         }
 669                                 }
 670                         }
 671
 672                         wfWarn( "Did not find alias for special page '$name'. " .
 673                                 "Perhaps no aliases are defined for it?" );
 674                 }
 675
 676                 if ( $subpage !== false && !is_null( $subpage ) ) {
 677                         $name = "$name/$subpage";
 678                 }
 679
 680                 return $wgContLang->ucfirst( $name );
 681         }
 682
 683         /**
 684          * Get a title for a given alias
 685          *
 686          * @param string $alias
 687          * @return Title|null Title or null if there is no such alias
 688          */
 689         public static function getTitleForAlias( $alias ) {
 690                 list( $name, $subpage ) = self::resolveAlias( $alias );
 691                 if ( $name != null ) {
 692                         return SpecialPage::getTitleFor( $name, $subpage );
 693                 } else {
 694                         return null;
 695                 }
 696         }
 697 }