includes/specialpage/SpecialPageFactory.php

   1 <?php
   2 /**
   3  * Factory for handling the special page list and generating SpecialPage objects.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24
  25 /**
  26  * Factory for handling the special page list and generating SpecialPage objects.
  27  *
  28  * To add a special page in an extension, add to $wgSpecialPages either
  29  * an object instance or an array containing the name and constructor
  30  * parameters. The latter is preferred for performance reasons.
  31  *
  32  * The object instantiated must be either an instance of SpecialPage or a
  33  * sub-class thereof. It must have an execute() method, which sends the HTML
  34  * for the special page to $wgOut. The parent class has an execute() method
  35  * which distributes the call to the historical global functions. Additionally,
  36  * execute() also checks if the user has the necessary access privileges
  37  * and bails out if not.
  38  *
  39  * To add a core special page, use the similar static list in
  40  * SpecialPageFactory::$list. To remove a core static special page at runtime, use
  41  * a SpecialPage_initList hook.
  42  *
  43  * @ingroup SpecialPage
  44  * @since 1.17
  45  */
  46 class SpecialPageFactory {
  47         /**
  48          * List of special page names to the subclass of SpecialPage which handles them.
  49          */
  50         private static $coreList = [
  51                 // Maintenance Reports
  52                 'BrokenRedirects' => 'BrokenRedirectsPage',
  53                 'Deadendpages' => 'DeadendPagesPage',
  54                 'DoubleRedirects' => 'DoubleRedirectsPage',
  55                 'Longpages' => 'LongPagesPage',
  56                 'Ancientpages' => 'AncientPagesPage',
  57                 'Lonelypages' => 'LonelyPagesPage',
  58                 'Fewestrevisions' => 'FewestrevisionsPage',
  59                 'Withoutinterwiki' => 'WithoutInterwikiPage',
  60                 'Protectedpages' => 'SpecialProtectedpages',
  61                 'Protectedtitles' => 'SpecialProtectedtitles',
  62                 'Shortpages' => 'ShortPagesPage',
  63                 'Uncategorizedcategories' => 'UncategorizedCategoriesPage',
  64                 'Uncategorizedimages' => 'UncategorizedImagesPage',
  65                 'Uncategorizedpages' => 'UncategorizedPagesPage',
  66                 'Uncategorizedtemplates' => 'UncategorizedTemplatesPage',
  67                 'Unusedcategories' => 'UnusedCategoriesPage',
  68                 'Unusedimages' => 'UnusedimagesPage',
  69                 'Unusedtemplates' => 'UnusedtemplatesPage',
  70                 'Unwatchedpages' => 'UnwatchedpagesPage',
  71                 'Wantedcategories' => 'WantedCategoriesPage',
  72                 'Wantedfiles' => 'WantedFilesPage',
  73                 'Wantedpages' => 'WantedPagesPage',
  74                 'Wantedtemplates' => 'WantedTemplatesPage',
  75
  76                 // List of pages
  77                 'Allpages' => 'SpecialAllPages',
  78                 'Prefixindex' => 'SpecialPrefixindex',
  79                 'Categories' => 'SpecialCategories',
  80                 'Listredirects' => 'ListredirectsPage',
  81                 'PagesWithProp' => 'SpecialPagesWithProp',
  82                 'TrackingCategories' => 'SpecialTrackingCategories',
  83
  84                 // Login/create account
  85                 'Userlogin' => 'LoginForm',
  86                 'CreateAccount' => 'SpecialCreateAccount',
  87
  88                 // Users and rights
  89                 'Block' => 'SpecialBlock',
  90                 'Unblock' => 'SpecialUnblock',
  91                 'BlockList' => 'SpecialBlockList',
  92                 'ChangePassword' => 'SpecialChangePassword',
  93                 'BotPasswords' => 'SpecialBotPasswords',
  94                 'PasswordReset' => 'SpecialPasswordReset',
  95                 'DeletedContributions' => 'DeletedContributionsPage',
  96                 'Preferences' => 'SpecialPreferences',
  97                 'ResetTokens' => 'SpecialResetTokens',
  98                 'Contributions' => 'SpecialContributions',
  99                 'Listgrouprights' => 'SpecialListGroupRights',
 100                 'Listgrants' => 'SpecialListGrants',
 101                 'Listusers' => 'SpecialListUsers',
 102                 'Listadmins' => 'SpecialListAdmins',
 103                 'Listbots' => 'SpecialListBots',
 104                 'Userrights' => 'UserrightsPage',
 105                 'EditWatchlist' => 'SpecialEditWatchlist',
 106
 107                 // Recent changes and logs
 108                 'Newimages' => 'SpecialNewFiles',
 109                 'Log' => 'SpecialLog',
 110                 'Watchlist' => 'SpecialWatchlist',
 111                 'Newpages' => 'SpecialNewpages',
 112                 'Recentchanges' => 'SpecialRecentChanges',
 113                 'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 114                 'Tags' => 'SpecialTags',
 115
 116                 // Media reports and uploads
 117                 'Listfiles' => 'SpecialListFiles',
 118                 'Filepath' => 'SpecialFilepath',
 119                 'MediaStatistics' => 'MediaStatisticsPage',
 120                 'MIMEsearch' => 'MIMEsearchPage',
 121                 'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 122                 'Upload' => 'SpecialUpload',
 123                 'UploadStash' => 'SpecialUploadStash',
 124                 'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 125
 126                 // Data and tools
 127                 'ApiSandbox' => 'SpecialApiSandbox',
 128                 'Statistics' => 'SpecialStatistics',
 129                 'Allmessages' => 'SpecialAllMessages',
 130                 'Version' => 'SpecialVersion',
 131                 'Lockdb' => 'SpecialLockdb',
 132                 'Unlockdb' => 'SpecialUnlockdb',
 133
 134                 // Redirecting special pages
 135                 'LinkSearch' => 'LinkSearchPage',
 136                 'Randompage' => 'RandomPage',
 137                 'RandomInCategory' => 'SpecialRandomInCategory',
 138                 'Randomredirect' => 'SpecialRandomredirect',
 139                 'Randomrootpage' => 'SpecialRandomrootpage',
 140
 141                 // High use pages
 142                 'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 143                 'Mostimages' => 'MostimagesPage',
 144                 'Mostinterwikis' => 'MostinterwikisPage',
 145                 'Mostlinked' => 'MostlinkedPage',
 146                 'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 147                 'Mostcategories' => 'MostcategoriesPage',
 148                 'Mostrevisions' => 'MostrevisionsPage',
 149
 150                 // Page tools
 151                 'ComparePages' => 'SpecialComparePages',
 152                 'Export' => 'SpecialExport',
 153                 'Import' => 'SpecialImport',
 154                 'Undelete' => 'SpecialUndelete',
 155                 'Whatlinkshere' => 'SpecialWhatLinksHere',
 156                 'MergeHistory' => 'SpecialMergeHistory',
 157                 'ExpandTemplates' => 'SpecialExpandTemplates',
 158
 159                 // Other
 160                 'Booksources' => 'SpecialBookSources',
 161
 162                 // Unlisted / redirects
 163                 'ApiHelp' => 'SpecialApiHelp',
 164                 'Blankpage' => 'SpecialBlankpage',
 165                 'Diff' => 'SpecialDiff',
 166                 'EditTags' => 'SpecialEditTags',
 167                 'Emailuser' => 'SpecialEmailUser',
 168                 'Movepage' => 'MovePageForm',
 169                 'Mycontributions' => 'SpecialMycontributions',
 170                 'MyLanguage' => 'SpecialMyLanguage',
 171                 'Mypage' => 'SpecialMypage',
 172                 'Mytalk' => 'SpecialMytalk',
 173                 'Myuploads' => 'SpecialMyuploads',
 174                 'AllMyUploads' => 'SpecialAllMyUploads',
 175                 'PermanentLink' => 'SpecialPermanentLink',
 176                 'Redirect' => 'SpecialRedirect',
 177                 'Revisiondelete' => 'SpecialRevisionDelete',
 178                 'RunJobs' => 'SpecialRunJobs',
 179                 'Specialpages' => 'SpecialSpecialpages',
 180                 'Userlogout' => 'SpecialUserlogout',
 181         ];
 182
 183         private static $list;
 184         private static $aliases;
 185         private static $pageObjectCache = [];
 186
 187         /**
 188          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 189          * the internal list has already been initialized, e.g. during testing.
 190          */
 191         public static function resetList() {
 192                 self::$list = null;
 193                 self::$aliases = null;
 194                 self::$pageObjectCache = [];
 195         }
 196
 197         /**
 198          * Returns a list of canonical special page names.
 199          * May be used to iterate over all registered special pages.
 200          *
 201          * @return string[]
 202          */
 203         public static function getNames() {
 204                 return array_keys( self::getPageList() );
 205         }
 206
 207         /**
 208          * Get the special page list as an array
 209          *
 210          * @deprecated since 1.24, use getNames() instead.
 211          * @return array
 212          */
 213         public static function getList() {
 214                 wfDeprecated( __FUNCTION__, '1.24' );
 215                 return self::getPageList();
 216         }
 217
 218         /**
 219          * Get the special page list as an array
 220          *
 221          * @return array
 222          */
 223         private static function getPageList() {
 224                 global $wgSpecialPages;
 225                 global $wgDisableInternalSearch, $wgEmailAuthentication;
 226                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 227                 global $wgPageLanguageUseDB, $wgContentHandlerUseDB;
 228
 229                 if ( !is_array( self::$list ) ) {
 230
 231                         self::$list = self::$coreList;
 232
 233                         if ( !$wgDisableInternalSearch ) {
 234                                 self::$list['Search'] = 'SpecialSearch';
 235                         }
 236
 237                         if ( $wgEmailAuthentication ) {
 238                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 239                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 240                         }
 241
 242                         if ( $wgEnableEmail ) {
 243                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 244                         }
 245
 246                         if ( $wgEnableJavaScriptTest ) {
 247                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 248                         }
 249
 250                         if ( $wgPageLanguageUseDB ) {
 251                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 252                         }
 253                         if ( $wgContentHandlerUseDB ) {
 254                                 self::$list['ChangeContentModel'] = 'SpecialChangeContentModel';
 255                         }
 256
 257                         self::$list['Activeusers'] = 'SpecialActiveUsers';
 258
 259                         // Add extension special pages
 260                         self::$list = array_merge( self::$list, $wgSpecialPages );
 261
 262                         // This hook can be used to disable unwanted core special pages
 263                         // or conditionally register special pages.
 264                         Hooks::run( 'SpecialPage_initList', [ &self::$list ] );
 265
 266                 }
 267
 268                 return self::$list;
 269         }
 270
 271         /**
 272          * Initialise and return the list of special page aliases. Returns an array where
 273          * the key is an alias, and the value is the canonical name of the special page.
 274          * All registered special pages are guaranteed to map to themselves.
 275          * @return array
 276          */
 277         private static function getAliasList() {
 278                 if ( is_null( self::$aliases ) ) {
 279                         global $wgContLang;
 280                         $aliases = $wgContLang->getSpecialPageAliases();
 281                         $pageList = self::getPageList();
 282
 283                         self::$aliases = [];
 284                         $keepAlias = [];
 285
 286                         // Force every canonical name to be an alias for itself.
 287                         foreach ( $pageList as $name => $stuff ) {
 288                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 289                                 self::$aliases[$caseFoldedAlias] = $name;
 290                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 291                         }
 292
 293                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 294                         if ( is_array( $aliases ) ) {
 295                                 foreach ( $aliases as $realName => $aliasList ) {
 296                                         $aliasList = array_values( $aliasList );
 297                                         foreach ( $aliasList as $i => $alias ) {
 298                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 299
 300                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 301                                                         $realName === self::$aliases[$caseFoldedAlias]
 302                                                 ) {
 303                                                         // Ignore same-realName conflicts
 304                                                         continue;
 305                                                 }
 306
 307                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 308                                                         self::$aliases[$caseFoldedAlias] = $realName;
 309                                                         if ( !$i ) {
 310                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 311                                                         }
 312                                                 } elseif ( !$i ) {
 313                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 314                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 315                                                                 self::$aliases[$caseFoldedAlias]
 316                                                         );
 317                                                 }
 318                                         }
 319                                 }
 320                         }
 321                 }
 322
 323                 return self::$aliases;
 324         }
 325
 326         /**
 327          * Given a special page name with a possible subpage, return an array
 328          * where the first element is the special page name and the second is the
 329          * subpage.
 330          *
 331          * @param string $alias
 332          * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 333          */
 334         public static function resolveAlias( $alias ) {
 335                 global $wgContLang;
 336                 $bits = explode( '/', $alias, 2 );
 337
 338                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 339                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 340                 $aliases = self::getAliasList();
 341                 if ( isset( $aliases[$caseFoldedAlias] ) ) {
 342                         $name = $aliases[$caseFoldedAlias];
 343                 } else {
 344                         return [ null, null ];
 345                 }
 346
 347                 if ( !isset( $bits[1] ) ) { // bug 2087
 348                         $par = null;
 349                 } else {
 350                         $par = $bits[1];
 351                 }
 352
 353                 return [ $name, $par ];
 354         }
 355
 356         /**
 357          * Check if a given name exist as a special page or as a special page alias
 358          *
 359          * @param string $name Name of a special page
 360          * @return bool True if a special page exists with this name
 361          */
 362         public static function exists( $name ) {
 363                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 364
 365                 $specialPageList = self::getPageList();
 366                 return isset( $specialPageList[$title] );
 367         }
 368
 369         /**
 370          * Find the object with a given name and return it (or NULL)
 371          *
 372          * @param string $name Special page name, may be localised and/or an alias
 373          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 374          */
 375         public static function getPage( $name ) {
 376                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 377
 378                 if ( isset( self::$pageObjectCache[$realName] ) ) {
 379                         return self::$pageObjectCache[$realName];
 380                 }
 381
 382                 $specialPageList = self::getPageList();
 383
 384                 if ( isset( $specialPageList[$realName] ) ) {
 385                         $rec = $specialPageList[$realName];
 386
 387                         if ( is_callable( $rec ) ) {
 388                                 // Use callback to instantiate the special page
 389                                 $page = call_user_func( $rec );
 390                         } elseif ( is_string( $rec ) ) {
 391                                 $className = $rec;
 392                                 $page = new $className;
 393                         } elseif ( is_array( $rec ) ) {
 394                                 $className = array_shift( $rec );
 395                                 // @deprecated, officially since 1.18, unofficially since forever
 396                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 397                                         "define a subclass of SpecialPage instead.", '1.18' );
 398                                 $page = ObjectFactory::getObjectFromSpec( [
 399                                         'class' => $className,
 400                                         'args' => $rec,
 401                                         'closure_expansion' => false,
 402                                 ] );
 403                         } elseif ( $rec instanceof SpecialPage ) {
 404                                 $page = $rec; // XXX: we should deep clone here
 405                         } else {
 406                                 $page = null;
 407                         }
 408
 409                         self::$pageObjectCache[$realName] = $page;
 410                         if ( $page instanceof SpecialPage ) {
 411                                 return $page;
 412                         } else {
 413                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 414                                 // nor a special page object. Give up.
 415                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 416                                 return null;
 417                         }
 418
 419                 } else {
 420                         return null;
 421                 }
 422         }
 423
 424         /**
 425          * Return categorised listable special pages which are available
 426          * for the current user, and everyone.
 427          *
 428          * @param User $user User object to check permissions, $wgUser will be used
 429          *        if not provided
 430          * @return array ( string => Specialpage )
 431          */
 432         public static function getUsablePages( User $user = null ) {
 433                 $pages = [];
 434                 if ( $user === null ) {
 435                         global $wgUser;
 436                         $user = $wgUser;
 437                 }
 438                 foreach ( self::getPageList() as $name => $rec ) {
 439                         $page = self::getPage( $name );
 440                         if ( $page ) { // not null
 441                                 $page->setContext( RequestContext::getMain() );
 442                                 if ( $page->isListed()
 443                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 444                                 ) {
 445                                         $pages[$name] = $page;
 446                                 }
 447                         }
 448                 }
 449
 450                 return $pages;
 451         }
 452
 453         /**
 454          * Return categorised listable special pages for all users
 455          *
 456          * @return array ( string => Specialpage )
 457          */
 458         public static function getRegularPages() {
 459                 $pages = [];
 460                 foreach ( self::getPageList() as $name => $rec ) {
 461                         $page = self::getPage( $name );
 462                         if ( $page->isListed() && !$page->isRestricted() ) {
 463                                 $pages[$name] = $page;
 464                         }
 465                 }
 466
 467                 return $pages;
 468         }
 469
 470         /**
 471          * Return categorised listable special pages which are available
 472          * for the current user, but not for everyone
 473          *
 474          * @param User|null $user User object to use or null for $wgUser
 475          * @return array ( string => Specialpage )
 476          */
 477         public static function getRestrictedPages( User $user = null ) {
 478                 $pages = [];
 479                 if ( $user === null ) {
 480                         global $wgUser;
 481                         $user = $wgUser;
 482                 }
 483                 foreach ( self::getPageList() as $name => $rec ) {
 484                         $page = self::getPage( $name );
 485                         if (
 486                                 $page->isListed()
 487                                 && $page->isRestricted()
 488                                 && $page->userCanExecute( $user )
 489                         ) {
 490                                 $pages[$name] = $page;
 491                         }
 492                 }
 493
 494                 return $pages;
 495         }
 496
 497         /**
 498          * Execute a special page path.
 499          * The path may contain parameters, e.g. Special:Name/Params
 500          * Extracts the special page name and call the execute method, passing the parameters
 501          *
 502          * Returns a title object if the page is redirected, false if there was no such special
 503          * page, and true if it was successful.
 504          *
 505          * @param Title $title
 506          * @param IContextSource $context
 507          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 508          *
 509          * @return bool
 510          */
 511         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 512                 // @todo FIXME: Redirects broken due to this call
 513                 $bits = explode( '/', $title->getDBkey(), 2 );
 514                 $name = $bits[0];
 515                 if ( !isset( $bits[1] ) ) { // bug 2087
 516                         $par = null;
 517                 } else {
 518                         $par = $bits[1];
 519                 }
 520
 521                 $page = self::getPage( $name );
 522                 if ( !$page ) {
 523                         $context->getOutput()->setArticleRelated( false );
 524                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 525
 526                         global $wgSend404Code;
 527                         if ( $wgSend404Code ) {
 528                                 $context->getOutput()->setStatusCode( 404 );
 529                         }
 530
 531                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 532
 533                         return false;
 534                 }
 535
 536                 if ( !$including ) {
 537                         // Narrow DB query expectations for this HTTP request
 538                         $trxLimits = $context->getConfig()->get( 'TrxProfilerLimits' );
 539                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 540                         if ( $context->getRequest()->wasPosted() && !$page->doesWrites() ) {
 541                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 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 }