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                 'Activeusers' => 'SpecialActiveUsers',
  90                 'Block' => 'SpecialBlock',
  91                 'Unblock' => 'SpecialUnblock',
  92                 'BlockList' => 'SpecialBlockList',
  93                 'ChangePassword' => 'SpecialChangePassword',
  94                 'BotPasswords' => 'SpecialBotPasswords',
  95                 'PasswordReset' => 'SpecialPasswordReset',
  96                 'DeletedContributions' => 'DeletedContributionsPage',
  97                 'Preferences' => 'SpecialPreferences',
  98                 'ResetTokens' => 'SpecialResetTokens',
  99                 'Contributions' => 'SpecialContributions',
 100                 'Listgrouprights' => 'SpecialListGroupRights',
 101                 'Listgrants' => 'SpecialListGrants',
 102                 'Listusers' => 'SpecialListUsers',
 103                 'Listadmins' => 'SpecialListAdmins',
 104                 'Listbots' => 'SpecialListBots',
 105                 'Userrights' => 'UserrightsPage',
 106                 'EditWatchlist' => 'SpecialEditWatchlist',
 107
 108                 // Recent changes and logs
 109                 'Newimages' => 'SpecialNewFiles',
 110                 'Log' => 'SpecialLog',
 111                 'Watchlist' => 'SpecialWatchlist',
 112                 'Newpages' => 'SpecialNewpages',
 113                 'Recentchanges' => 'SpecialRecentChanges',
 114                 'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 115                 'Tags' => 'SpecialTags',
 116
 117                 // Media reports and uploads
 118                 'Listfiles' => 'SpecialListFiles',
 119                 'Filepath' => 'SpecialFilepath',
 120                 'MediaStatistics' => 'MediaStatisticsPage',
 121                 'MIMEsearch' => 'MIMEsearchPage',
 122                 'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 123                 'Upload' => 'SpecialUpload',
 124                 'UploadStash' => 'SpecialUploadStash',
 125                 'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 126
 127                 // Data and tools
 128                 'ApiSandbox' => 'SpecialApiSandbox',
 129                 'Statistics' => 'SpecialStatistics',
 130                 'Allmessages' => 'SpecialAllMessages',
 131                 'Version' => 'SpecialVersion',
 132                 'Lockdb' => 'SpecialLockdb',
 133                 'Unlockdb' => 'SpecialUnlockdb',
 134
 135                 // Redirecting special pages
 136                 'LinkSearch' => 'LinkSearchPage',
 137                 'Randompage' => 'RandomPage',
 138                 'RandomInCategory' => 'SpecialRandomInCategory',
 139                 'Randomredirect' => 'SpecialRandomredirect',
 140                 'Randomrootpage' => 'SpecialRandomrootpage',
 141
 142                 // High use pages
 143                 'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 144                 'Mostimages' => 'MostimagesPage',
 145                 'Mostinterwikis' => 'MostinterwikisPage',
 146                 'Mostlinked' => 'MostlinkedPage',
 147                 'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 148                 'Mostcategories' => 'MostcategoriesPage',
 149                 'Mostrevisions' => 'MostrevisionsPage',
 150
 151                 // Page tools
 152                 'ComparePages' => 'SpecialComparePages',
 153                 'Export' => 'SpecialExport',
 154                 'Import' => 'SpecialImport',
 155                 'Undelete' => 'SpecialUndelete',
 156                 'Whatlinkshere' => 'SpecialWhatLinksHere',
 157                 'MergeHistory' => 'SpecialMergeHistory',
 158                 'ExpandTemplates' => 'SpecialExpandTemplates',
 159
 160                 // Other
 161                 'Booksources' => 'SpecialBookSources',
 162
 163                 // Unlisted / redirects
 164                 'ApiHelp' => 'SpecialApiHelp',
 165                 'Blankpage' => 'SpecialBlankpage',
 166                 'Diff' => 'SpecialDiff',
 167                 'EditTags' => 'SpecialEditTags',
 168                 'Emailuser' => 'SpecialEmailUser',
 169                 'Movepage' => 'MovePageForm',
 170                 'Mycontributions' => 'SpecialMycontributions',
 171                 'MyLanguage' => 'SpecialMyLanguage',
 172                 'Mypage' => 'SpecialMypage',
 173                 'Mytalk' => 'SpecialMytalk',
 174                 'Myuploads' => 'SpecialMyuploads',
 175                 'AllMyUploads' => 'SpecialAllMyUploads',
 176                 'PermanentLink' => 'SpecialPermanentLink',
 177                 'Redirect' => 'SpecialRedirect',
 178                 'Revisiondelete' => 'SpecialRevisionDelete',
 179                 'RunJobs' => 'SpecialRunJobs',
 180                 'Specialpages' => 'SpecialSpecialpages',
 181                 'Userlogout' => 'SpecialUserlogout',
 182         ];
 183
 184         private static $list;
 185         private static $aliases;
 186         private static $pageObjectCache = [];
 187
 188         /**
 189          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 190          * the internal list has already been initialized, e.g. during testing.
 191          */
 192         public static function resetList() {
 193                 self::$list = null;
 194                 self::$aliases = null;
 195                 self::$pageObjectCache = [];
 196         }
 197
 198         /**
 199          * Returns a list of canonical special page names.
 200          * May be used to iterate over all registered special pages.
 201          *
 202          * @return string[]
 203          */
 204         public static function getNames() {
 205                 return array_keys( self::getPageList() );
 206         }
 207
 208         /**
 209          * Get the special page list as an array
 210          *
 211          * @deprecated since 1.24, use getNames() instead.
 212          * @return array
 213          */
 214         public static function getList() {
 215                 wfDeprecated( __FUNCTION__, '1.24' );
 216                 return self::getPageList();
 217         }
 218
 219         /**
 220          * Get the special page list as an array
 221          *
 222          * @return array
 223          */
 224         private static function getPageList() {
 225                 global $wgSpecialPages;
 226                 global $wgDisableInternalSearch, $wgEmailAuthentication;
 227                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 228                 global $wgPageLanguageUseDB, $wgContentHandlerUseDB;
 229
 230                 if ( !is_array( self::$list ) ) {
 231
 232                         self::$list = self::$coreList;
 233
 234                         if ( !$wgDisableInternalSearch ) {
 235                                 self::$list['Search'] = 'SpecialSearch';
 236                         }
 237
 238                         if ( $wgEmailAuthentication ) {
 239                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 240                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 241                         }
 242
 243                         if ( $wgEnableEmail ) {
 244                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 245                         }
 246
 247                         if ( $wgEnableJavaScriptTest ) {
 248                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 249                         }
 250
 251                         if ( $wgPageLanguageUseDB ) {
 252                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 253                         }
 254                         if ( $wgContentHandlerUseDB ) {
 255                                 self::$list['ChangeContentModel'] = 'SpecialChangeContentModel';
 256                         }
 257
 258                         // Add extension special pages
 259                         self::$list = array_merge( self::$list, $wgSpecialPages );
 260
 261                         // This hook can be used to disable unwanted core special pages
 262                         // or conditionally register special pages.
 263                         Hooks::run( 'SpecialPage_initList', [ &self::$list ] );
 264
 265                 }
 266
 267                 return self::$list;
 268         }
 269
 270         /**
 271          * Initialise and return the list of special page aliases. Returns an array where
 272          * the key is an alias, and the value is the canonical name of the special page.
 273          * All registered special pages are guaranteed to map to themselves.
 274          * @return array
 275          */
 276         private static function getAliasList() {
 277                 if ( is_null( self::$aliases ) ) {
 278                         global $wgContLang;
 279                         $aliases = $wgContLang->getSpecialPageAliases();
 280                         $pageList = self::getPageList();
 281
 282                         self::$aliases = [];
 283                         $keepAlias = [];
 284
 285                         // Force every canonical name to be an alias for itself.
 286                         foreach ( $pageList as $name => $stuff ) {
 287                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 288                                 self::$aliases[$caseFoldedAlias] = $name;
 289                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 290                         }
 291
 292                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 293                         if ( is_array( $aliases ) ) {
 294                                 foreach ( $aliases as $realName => $aliasList ) {
 295                                         $aliasList = array_values( $aliasList );
 296                                         foreach ( $aliasList as $i => $alias ) {
 297                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 298
 299                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 300                                                         $realName === self::$aliases[$caseFoldedAlias]
 301                                                 ) {
 302                                                         // Ignore same-realName conflicts
 303                                                         continue;
 304                                                 }
 305
 306                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 307                                                         self::$aliases[$caseFoldedAlias] = $realName;
 308                                                         if ( !$i ) {
 309                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 310                                                         }
 311                                                 } elseif ( !$i ) {
 312                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 313                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 314                                                                 self::$aliases[$caseFoldedAlias]
 315                                                         );
 316                                                 }
 317                                         }
 318                                 }
 319                         }
 320                 }
 321
 322                 return self::$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                 $aliases = self::getAliasList();
 340                 if ( isset( $aliases[$caseFoldedAlias] ) ) {
 341                         $name = $aliases[$caseFoldedAlias];
 342                 } else {
 343                         return [ null, null ];
 344                 }
 345
 346                 if ( !isset( $bits[1] ) ) { // bug 2087
 347                         $par = null;
 348                 } else {
 349                         $par = $bits[1];
 350                 }
 351
 352                 return [ $name, $par ];
 353         }
 354
 355         /**
 356          * Check if a given name exist as a special page or as a special page alias
 357          *
 358          * @param string $name Name of a special page
 359          * @return bool True if a special page exists with this name
 360          */
 361         public static function exists( $name ) {
 362                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 363
 364                 $specialPageList = self::getPageList();
 365                 return isset( $specialPageList[$title] );
 366         }
 367
 368         /**
 369          * Find the object with a given name and return it (or NULL)
 370          *
 371          * @param string $name Special page name, may be localised and/or an alias
 372          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 373          */
 374         public static function getPage( $name ) {
 375                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 376
 377                 if ( isset( self::$pageObjectCache[$realName] ) ) {
 378                         return self::$pageObjectCache[$realName];
 379                 }
 380
 381                 $specialPageList = self::getPageList();
 382
 383                 if ( isset( $specialPageList[$realName] ) ) {
 384                         $rec = $specialPageList[$realName];
 385
 386                         if ( is_callable( $rec ) ) {
 387                                 // Use callback to instantiate the special page
 388                                 $page = call_user_func( $rec );
 389                         } elseif ( is_string( $rec ) ) {
 390                                 $className = $rec;
 391                                 $page = new $className;
 392                         } elseif ( is_array( $rec ) ) {
 393                                 $className = array_shift( $rec );
 394                                 // @deprecated, officially since 1.18, unofficially since forever
 395                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 396                                         "define a subclass of SpecialPage instead.", '1.18' );
 397                                 $page = ObjectFactory::getObjectFromSpec( [
 398                                         'class' => $className,
 399                                         'args' => $rec,
 400                                         'closure_expansion' => false,
 401                                 ] );
 402                         } elseif ( $rec instanceof SpecialPage ) {
 403                                 $page = $rec; // XXX: we should deep clone here
 404                         } else {
 405                                 $page = null;
 406                         }
 407
 408                         self::$pageObjectCache[$realName] = $page;
 409                         if ( $page instanceof SpecialPage ) {
 410                                 return $page;
 411                         } else {
 412                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 413                                 // nor a special page object. Give up.
 414                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 415                                 return null;
 416                         }
 417
 418                 } else {
 419                         return null;
 420                 }
 421         }
 422
 423         /**
 424          * Return categorised listable special pages which are available
 425          * for the current user, and everyone.
 426          *
 427          * @param User $user User object to check permissions, $wgUser will be used
 428          *        if not provided
 429          * @return array ( string => Specialpage )
 430          */
 431         public static function getUsablePages( User $user = null ) {
 432                 $pages = [];
 433                 if ( $user === null ) {
 434                         global $wgUser;
 435                         $user = $wgUser;
 436                 }
 437                 foreach ( self::getPageList() as $name => $rec ) {
 438                         $page = self::getPage( $name );
 439                         if ( $page ) { // not null
 440                                 $page->setContext( RequestContext::getMain() );
 441                                 if ( $page->isListed()
 442                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 443                                 ) {
 444                                         $pages[$name] = $page;
 445                                 }
 446                         }
 447                 }
 448
 449                 return $pages;
 450         }
 451
 452         /**
 453          * Return categorised listable special pages for all users
 454          *
 455          * @return array ( string => Specialpage )
 456          */
 457         public static function getRegularPages() {
 458                 $pages = [];
 459                 foreach ( self::getPageList() as $name => $rec ) {
 460                         $page = self::getPage( $name );
 461                         if ( $page->isListed() && !$page->isRestricted() ) {
 462                                 $pages[$name] = $page;
 463                         }
 464                 }
 465
 466                 return $pages;
 467         }
 468
 469         /**
 470          * Return categorised listable special pages which are available
 471          * for the current user, but not for everyone
 472          *
 473          * @param User|null $user User object to use or null for $wgUser
 474          * @return array ( string => Specialpage )
 475          */
 476         public static function getRestrictedPages( User $user = null ) {
 477                 $pages = [];
 478                 if ( $user === null ) {
 479                         global $wgUser;
 480                         $user = $wgUser;
 481                 }
 482                 foreach ( self::getPageList() as $name => $rec ) {
 483                         $page = self::getPage( $name );
 484                         if (
 485                                 $page->isListed()
 486                                 && $page->isRestricted()
 487                                 && $page->userCanExecute( $user )
 488                         ) {
 489                                 $pages[$name] = $page;
 490                         }
 491                 }
 492
 493                 return $pages;
 494         }
 495
 496         /**
 497          * Execute a special page path.
 498          * The path may contain parameters, e.g. Special:Name/Params
 499          * Extracts the special page name and call the execute method, passing the parameters
 500          *
 501          * Returns a title object if the page is redirected, false if there was no such special
 502          * page, and true if it was successful.
 503          *
 504          * @param Title $title
 505          * @param IContextSource $context
 506          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 507          *
 508          * @return bool
 509          */
 510         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 511                 // @todo FIXME: Redirects broken due to this call
 512                 $bits = explode( '/', $title->getDBkey(), 2 );
 513                 $name = $bits[0];
 514                 if ( !isset( $bits[1] ) ) { // bug 2087
 515                         $par = null;
 516                 } else {
 517                         $par = $bits[1];
 518                 }
 519
 520                 $page = self::getPage( $name );
 521                 if ( !$page ) {
 522                         $context->getOutput()->setArticleRelated( false );
 523                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 524
 525                         global $wgSend404Code;
 526                         if ( $wgSend404Code ) {
 527                                 $context->getOutput()->setStatusCode( 404 );
 528                         }
 529
 530                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 531
 532                         return false;
 533                 }
 534
 535                 if ( !$including ) {
 536                         // Narrow DB query expectations for this HTTP request
 537                         $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
 538                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 539                         if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
 540                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 541                                 $context->getRequest()->markAsSafeRequest();
 542                         }
 543                 }
 544
 545                 // Page exists, set the context
 546                 $page->setContext( $context );
 547
 548                 if ( !$including ) {
 549                         // Redirect to canonical alias for GET commands
 550                         // Not for POST, we'd lose the post data, so it's best to just distribute
 551                         // the request. Such POST requests are possible for old extensions that
 552                         // generate self-links without being aware that their default name has
 553                         // changed.
 554                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 555                                 $query = $context->getRequest()->getQueryValues();
 556                                 unset( $query['title'] );
 557                                 $title = $page->getPageTitle( $par );
 558                                 $url = $title->getFullURL( $query );
 559                                 $context->getOutput()->redirect( $url );
 560
 561                                 return $title;
 562                         } else {
 563                                 $context->setTitle( $page->getPageTitle( $par ) );
 564                         }
 565                 } elseif ( !$page->isIncludable() ) {
 566                         return false;
 567                 }
 568
 569                 $page->including( $including );
 570
 571                 // Execute special page
 572                 $page->run( $par );
 573
 574                 return true;
 575         }
 576
 577         /**
 578          * Just like executePath() but will override global variables and execute
 579          * the page in "inclusion" mode. Returns true if the execution was
 580          * successful or false if there was no such special page, or a title object
 581          * if it was a redirect.
 582          *
 583          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 584          * variables so that the special page will get the context it'd expect on a
 585          * normal request, and then restores them to their previous values after.
 586          *
 587          * @param Title $title
 588          * @param IContextSource $context
 589          * @return string HTML fragment
 590          */
 591         public static function capturePath( Title $title, IContextSource $context ) {
 592                 global $wgTitle, $wgOut, $wgRequest, $wgUser, $wgLang;
 593                 $main = RequestContext::getMain();
 594
 595                 // Save current globals and main context
 596                 $glob = [
 597                         'title' => $wgTitle,
 598                         'output' => $wgOut,
 599                         'request' => $wgRequest,
 600                         'user' => $wgUser,
 601                         'language' => $wgLang,
 602                 ];
 603                 $ctx = [
 604                         'title' => $main->getTitle(),
 605                         'output' => $main->getOutput(),
 606                         'request' => $main->getRequest(),
 607                         'user' => $main->getUser(),
 608                         'language' => $main->getLanguage(),
 609                 ];
 610
 611                 // Override
 612                 $wgTitle = $title;
 613                 $wgOut = $context->getOutput();
 614                 $wgRequest = $context->getRequest();
 615                 $wgUser = $context->getUser();
 616                 $wgLang = $context->getLanguage();
 617                 $main->setTitle( $title );
 618                 $main->setOutput( $context->getOutput() );
 619                 $main->setRequest( $context->getRequest() );
 620                 $main->setUser( $context->getUser() );
 621                 $main->setLanguage( $context->getLanguage() );
 622
 623                 // The useful part
 624                 $ret = self::executePath( $title, $context, true );
 625
 626                 // Restore old globals and context
 627                 $wgTitle = $glob['title'];
 628                 $wgOut = $glob['output'];
 629                 $wgRequest = $glob['request'];
 630                 $wgUser = $glob['user'];
 631                 $wgLang = $glob['language'];
 632                 $main->setTitle( $ctx['title'] );
 633                 $main->setOutput( $ctx['output'] );
 634                 $main->setRequest( $ctx['request'] );
 635                 $main->setUser( $ctx['user'] );
 636                 $main->setLanguage( $ctx['language'] );
 637
 638                 return $ret;
 639         }
 640
 641         /**
 642          * Get the local name for a specified canonical name
 643          *
 644          * @param string $name
 645          * @param string|bool $subpage
 646          * @return string
 647          */
 648         public static function getLocalNameFor( $name, $subpage = false ) {
 649                 global $wgContLang;
 650                 $aliases = $wgContLang->getSpecialPageAliases();
 651                 $aliasList = self::getAliasList();
 652
 653                 // Find the first alias that maps back to $name
 654                 if ( isset( $aliases[$name] ) ) {
 655                         $found = false;
 656                         foreach ( $aliases[$name] as $alias ) {
 657                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 658                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 659                                 if ( isset( $aliasList[$caseFoldedAlias] ) &&
 660                                         $aliasList[$caseFoldedAlias] === $name
 661                                 ) {
 662                                         $name = $alias;
 663                                         $found = true;
 664                                         break;
 665                                 }
 666                         }
 667                         if ( !$found ) {
 668                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 669                                         "It seems all defined aliases conflict?" );
 670                         }
 671                 } else {
 672                         // Check if someone misspelled the correct casing
 673                         if ( is_array( $aliases ) ) {
 674                                 foreach ( $aliases as $n => $values ) {
 675                                         if ( strcasecmp( $name, $n ) === 0 ) {
 676                                                 wfWarn( "Found alias defined for $n when searching for " .
 677                                                         "special page aliases for $name. Case mismatch?" );
 678                                                 return self::getLocalNameFor( $n, $subpage );
 679                                         }
 680                                 }
 681                         }
 682
 683                         wfWarn( "Did not find alias for special page '$name'. " .
 684                                 "Perhaps no aliases are defined for it?" );
 685                 }
 686
 687                 if ( $subpage !== false && !is_null( $subpage ) ) {
 688                         $name = "$name/$subpage";
 689                 }
 690
 691                 return $wgContLang->ucfirst( $name );
 692         }
 693
 694         /**
 695          * Get a title for a given alias
 696          *
 697          * @param string $alias
 698          * @return Title|null Title or null if there is no such alias
 699          */
 700         public static function getTitleForAlias( $alias ) {
 701                 list( $name, $subpage ) = self::resolveAlias( $alias );
 702                 if ( $name != null ) {
 703                         return SpecialPage::getTitleFor( $name, $subpage );
 704                 } else {
 705                         return null;
 706                 }
 707         }
 708 }