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                 'Blankpage' => 'SpecialBlankpage',
 160                 'Diff' => 'SpecialDiff',
 161                 'Emailuser' => 'SpecialEmailUser',
 162                 'Movepage' => 'MovePageForm',
 163                 'Mycontributions' => 'SpecialMycontributions',
 164                 'MyLanguage' => 'SpecialMyLanguage',
 165                 'Mypage' => 'SpecialMypage',
 166                 'Mytalk' => 'SpecialMytalk',
 167                 'Myuploads' => 'SpecialMyuploads',
 168                 'AllMyUploads' => 'SpecialAllMyUploads',
 169                 'PermanentLink' => 'SpecialPermanentLink',
 170                 'Redirect' => 'SpecialRedirect',
 171                 'Revisiondelete' => 'SpecialRevisionDelete',
 172                 'RunJobs' => 'SpecialRunJobs',
 173                 'Specialpages' => 'SpecialSpecialpages',
 174                 'Userlogout' => 'SpecialUserlogout',
 175         );
 176
 177         private static $list;
 178         private static $aliases;
 179
 180         /**
 181          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 182          * the internal list has already been initialized, e.g. during testing.
 183          */
 184         public static function resetList() {
 185                 self::$list = null;
 186                 self::$aliases = null;
 187         }
 188
 189         /**
 190          * Returns a list of canonical special page names.
 191          * May be used to iterate over all registered special pages.
 192          *
 193          * @return string[]
 194          */
 195         public static function getNames() {
 196                 return array_keys( self::getPageList() );
 197         }
 198
 199         /**
 200          * Get the special page list as an array
 201          *
 202          * @deprecated since 1.24, use getNames() instead.
 203          * @return array
 204          */
 205         public static function getList() {
 206                 wfDeprecated( __FUNCTION__, '1.24' );
 207                 return self::getPageList();
 208         }
 209
 210         /**
 211          * Get the special page list as an array
 212          *
 213          * @return array
 214          */
 215         private static function getPageList() {
 216                 global $wgSpecialPages;
 217                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 218                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 219                 global $wgPageLanguageUseDB;
 220
 221                 if ( !is_array( self::$list ) ) {
 222                         wfProfileIn( __METHOD__ );
 223
 224                         self::$list = self::$coreList;
 225
 226                         if ( !$wgDisableCounters ) {
 227                                 self::$list['Popularpages'] = 'PopularPagesPage';
 228                         }
 229
 230                         if ( !$wgDisableInternalSearch ) {
 231                                 self::$list['Search'] = 'SpecialSearch';
 232                         }
 233
 234                         if ( $wgEmailAuthentication ) {
 235                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 236                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 237                         }
 238
 239                         if ( $wgEnableEmail ) {
 240                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 241                         }
 242
 243                         if ( $wgEnableJavaScriptTest ) {
 244                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 245                         }
 246
 247                         if ( $wgPageLanguageUseDB ) {
 248                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 249                         }
 250
 251                         self::$list['Activeusers'] = 'SpecialActiveUsers';
 252
 253                         // Add extension special pages
 254                         self::$list = array_merge( self::$list, $wgSpecialPages );
 255
 256                         // Run hooks
 257                         // This hook can be used to remove undesired built-in special pages
 258                         wfRunHooks( 'SpecialPage_initList', array( &self::$list ) );
 259
 260                         wfProfileOut( __METHOD__ );
 261                 }
 262
 263                 return self::$list;
 264         }
 265
 266         /**
 267          * Initialise and return the list of special page aliases.  Returns an object with
 268          * properties which can be accessed $obj->pagename - each property name is an
 269          * alias, with the value being the canonical name of the special page. All
 270          * registered special pages are guaranteed to map to themselves.
 271          * @return object
 272          */
 273         private static function getAliasListObject() {
 274                 if ( !is_object( self::$aliases ) ) {
 275                         global $wgContLang;
 276                         $aliases = $wgContLang->getSpecialPageAliases();
 277                         $pageList = self::getPageList();
 278
 279                         self::$aliases = array();
 280                         $keepAlias = array();
 281
 282                         // Force every canonical name to be an alias for itself.
 283                         foreach ( $pageList as $name => $stuff ) {
 284                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 285                                 self::$aliases[$caseFoldedAlias] = $name;
 286                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 287                         }
 288
 289                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 290                         if ( is_array( $aliases ) ) {
 291                                 foreach ( $aliases as $realName => $aliasList ) {
 292                                         $aliasList = array_values( $aliasList );
 293                                         foreach ( $aliasList as $i => $alias ) {
 294                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 295
 296                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 297                                                         $realName === self::$aliases[$caseFoldedAlias]
 298                                                 ) {
 299                                                         // Ignore same-realName conflicts
 300                                                         continue;
 301                                                 }
 302
 303                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 304                                                         self::$aliases[$caseFoldedAlias] = $realName;
 305                                                         if ( !$i ) {
 306                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 307                                                         }
 308                                                 } elseif ( !$i ) {
 309                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 310                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 311                                                                 self::$aliases[$caseFoldedAlias]
 312                                                         );
 313                                                 }
 314                                         }
 315                                 }
 316                         }
 317
 318                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 319                         self::$aliases = (object)self::$aliases;
 320                 }
 321
 322                 return self::$aliases;
 323         }
 324
 325         /**
 326          * Given a special page name with a possible subpage, return an array
 327          * where the first element is the special page name and the second is the
 328          * subpage.
 329          *
 330          * @param string $alias
 331          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 332          */
 333         public static function resolveAlias( $alias ) {
 334                 global $wgContLang;
 335                 $bits = explode( '/', $alias, 2 );
 336
 337                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 338                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 339                 if ( isset( self::getAliasListObject()->$caseFoldedAlias ) ) {
 340                         $name = self::getAliasListObject()->$caseFoldedAlias;
 341                 } else {
 342                         return array( null, null );
 343                 }
 344
 345                 if ( !isset( $bits[1] ) ) { // bug 2087
 346                         $par = null;
 347                 } else {
 348                         $par = $bits[1];
 349                 }
 350
 351                 return array( $name, $par );
 352         }
 353
 354         /**
 355          * Add a page to a certain display group for Special:SpecialPages
 356          *
 357          * @param SpecialPage|string $page
 358          * @param string $group
 359          * @deprecated since 1.21 Override SpecialPage::getGroupName
 360          */
 361         public static function setGroup( $page, $group ) {
 362                 wfDeprecated( __METHOD__, '1.21' );
 363
 364                 global $wgSpecialPageGroups;
 365                 $name = is_object( $page ) ? $page->getName() : $page;
 366                 $wgSpecialPageGroups[$name] = $group;
 367         }
 368
 369         /**
 370          * Get the group that the special page belongs in on Special:SpecialPage
 371          *
 372          * @param SpecialPage $page
 373          * @return string
 374          * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
 375          */
 376         public static function getGroup( &$page ) {
 377                 wfDeprecated( __METHOD__, '1.21' );
 378
 379                 return $page->getFinalGroupName();
 380         }
 381
 382         /**
 383          * Check if a given name exist as a special page or as a special page alias
 384          *
 385          * @param string $name Name of a special page
 386          * @return bool True if a special page exists with this name
 387          */
 388         public static function exists( $name ) {
 389                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 390
 391                 $specialPageList = self::getPageList();
 392                 return isset( $specialPageList[$title] );
 393         }
 394
 395         /**
 396          * Find the object with a given name and return it (or NULL)
 397          *
 398          * @param string $name Special page name, may be localised and/or an alias
 399          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 400          */
 401         public static function getPage( $name ) {
 402                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 403
 404                 $specialPageList = self::getPageList();
 405
 406                 if ( isset( $specialPageList[$realName] ) ) {
 407                         $rec = $specialPageList[$realName];
 408
 409                         if ( is_callable( $rec ) ) {
 410                                 // Use callback to instantiate the special page
 411                                 $page = call_user_func( $rec );
 412                         } elseif ( is_string( $rec ) ) {
 413                                 $className = $rec;
 414                                 $page = new $className;
 415                         } elseif ( is_array( $rec ) ) {
 416                                 $className = array_shift( $rec );
 417                                 // @deprecated, officially since 1.18, unofficially since forever
 418                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 419                                         "define a subclass of SpecialPage instead.", '1.18' );
 420                                 $page = MWFunction::newObj( $className, $rec );
 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                 wfProfileIn( __METHOD__ );
 530
 531                 // @todo FIXME: Redirects broken due to this call
 532                 $bits = explode( '/', $title->getDBkey(), 2 );
 533                 $name = $bits[0];
 534                 if ( !isset( $bits[1] ) ) { // bug 2087
 535                         $par = null;
 536                 } else {
 537                         $par = $bits[1];
 538                 }
 539                 $page = self::getPage( $name );
 540                 // Nonexistent?
 541                 if ( !$page ) {
 542                         $context->getOutput()->setArticleRelated( false );
 543                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 544
 545                         global $wgSend404Code;
 546                         if ( $wgSend404Code ) {
 547                                 $context->getOutput()->setStatusCode( 404 );
 548                         }
 549
 550                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 551                         wfProfileOut( __METHOD__ );
 552
 553                         return false;
 554                 }
 555
 556                 // Page exists, set the context
 557                 $page->setContext( $context );
 558
 559                 if ( !$including ) {
 560                         // Redirect to canonical alias for GET commands
 561                         // Not for POST, we'd lose the post data, so it's best to just distribute
 562                         // the request. Such POST requests are possible for old extensions that
 563                         // generate self-links without being aware that their default name has
 564                         // changed.
 565                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 566                                 $query = $context->getRequest()->getQueryValues();
 567                                 unset( $query['title'] );
 568                                 $title = $page->getPageTitle( $par );
 569                                 $url = $title->getFullURL( $query );
 570                                 $context->getOutput()->redirect( $url );
 571                                 wfProfileOut( __METHOD__ );
 572
 573                                 return $title;
 574                         } else {
 575                                 $context->setTitle( $page->getPageTitle( $par ) );
 576                         }
 577                 } elseif ( !$page->isIncludable() ) {
 578                         wfProfileOut( __METHOD__ );
 579
 580                         return false;
 581                 }
 582
 583                 $page->including( $including );
 584
 585                 // Execute special page
 586                 $profName = 'Special:' . $page->getName();
 587                 wfProfileIn( $profName );
 588                 $page->run( $par );
 589                 wfProfileOut( $profName );
 590                 wfProfileOut( __METHOD__ );
 591
 592                 return true;
 593         }
 594
 595         /**
 596          * Just like executePath() but will override global variables and execute
 597          * the page in "inclusion" mode. Returns true if the execution was
 598          * successful or false if there was no such special page, or a title object
 599          * if it was a redirect.
 600          *
 601          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 602          * variables so that the special page will get the context it'd expect on a
 603          * normal request, and then restores them to their previous values after.
 604          *
 605          * @param Title $title
 606          * @param IContextSource $context
 607          * @return string HTML fragment
 608          */
 609         public static function capturePath( Title $title, IContextSource $context ) {
 610                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 611
 612                 // Save current globals
 613                 $oldTitle = $wgTitle;
 614                 $oldOut = $wgOut;
 615                 $oldRequest = $wgRequest;
 616                 $oldUser = $wgUser;
 617                 $oldLang = $wgLang;
 618
 619                 // Set the globals to the current context
 620                 $wgTitle = $title;
 621                 $wgOut = $context->getOutput();
 622                 $wgRequest = $context->getRequest();
 623                 $wgUser = $context->getUser();
 624                 $wgLang = $context->getLanguage();
 625
 626                 // The useful part
 627                 $ret = self::executePath( $title, $context, true );
 628
 629                 // And restore the old globals
 630                 $wgTitle = $oldTitle;
 631                 $wgOut = $oldOut;
 632                 $wgRequest = $oldRequest;
 633                 $wgUser = $oldUser;
 634                 $wgLang = $oldLang;
 635
 636                 return $ret;
 637         }
 638
 639         /**
 640          * Get the local name for a specified canonical name
 641          *
 642          * @param string $name
 643          * @param string|bool $subpage
 644          * @return string
 645          */
 646         public static function getLocalNameFor( $name, $subpage = false ) {
 647                 global $wgContLang;
 648                 $aliases = $wgContLang->getSpecialPageAliases();
 649                 $aliasList = self::getAliasListObject();
 650
 651                 // Find the first alias that maps back to $name
 652                 if ( isset( $aliases[$name] ) ) {
 653                         $found = false;
 654                         foreach ( $aliases[$name] as $alias ) {
 655                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 656                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 657                                 if ( isset( $aliasList->$caseFoldedAlias ) &&
 658                                         $aliasList->$caseFoldedAlias === $name
 659                                 ) {
 660                                         $name = $alias;
 661                                         $found = true;
 662                                         break;
 663                                 }
 664                         }
 665                         if ( !$found ) {
 666                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 667                                         "It seems all defined aliases conflict?" );
 668                         }
 669                 } else {
 670                         // Check if someone misspelled the correct casing
 671                         if ( is_array( $aliases ) ) {
 672                                 foreach ( $aliases as $n => $values ) {
 673                                         if ( strcasecmp( $name, $n ) === 0 ) {
 674                                                 wfWarn( "Found alias defined for $n when searching for " .
 675                                                         "special page aliases for $name. Case mismatch?" );
 676                                                 return self::getLocalNameFor( $n, $subpage );
 677                                         }
 678                                 }
 679                         }
 680
 681                         wfWarn( "Did not find alias for special page '$name'. " .
 682                                 "Perhaps no aliases are defined for it?" );
 683                 }
 684
 685                 if ( $subpage !== false && !is_null( $subpage ) ) {
 686                         $name = "$name/$subpage";
 687                 }
 688
 689                 return $wgContLang->ucfirst( $name );
 690         }
 691
 692         /**
 693          * Get a title for a given alias
 694          *
 695          * @param string $alias
 696          * @return Title|null Title or null if there is no such alias
 697          */
 698         public static function getTitleForAlias( $alias ) {
 699                 list( $name, $subpage ) = self::resolveAlias( $alias );
 700                 if ( $name != null ) {
 701                         return SpecialPage::getTitleFor( $name, $subpage );
 702                 } else {
 703                         return null;
 704                 }
 705         }
 706 }