includes/specialpage/SpecialPageFactory.php

   1 <?php
   2 /**
   3  * Factory for handling the special page list and generating SpecialPage objects.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24
  25 /**
  26  * Factory for handling the special page list and generating SpecialPage objects.
  27  *
  28  * To add a special page in an extension, add to $wgSpecialPages either
  29  * an object instance or an array containing the name and constructor
  30  * parameters. The latter is preferred for performance reasons.
  31  *
  32  * The object instantiated must be either an instance of SpecialPage or a
  33  * sub-class thereof. It must have an execute() method, which sends the HTML
  34  * for the special page to $wgOut. The parent class has an execute() method
  35  * which distributes the call to the historical global functions. Additionally,
  36  * execute() also checks if the user has the necessary access privileges
  37  * and bails out if not.
  38  *
  39  * To add a core special page, use the similar static list in
  40  * SpecialPageFactory::$list. To remove a core static special page at runtime, use
  41  * a SpecialPage_initList hook.
  42  *
  43  * @ingroup SpecialPage
  44  * @since 1.17
  45  */
  46 class SpecialPageFactory {
  47         /**
  48          * List of special page names to the subclass of SpecialPage which handles them.
  49          */
  50         private static $coreList = array(
  51                 // Maintenance Reports
  52                 'BrokenRedirects' => 'BrokenRedirectsPage',
  53                 'Deadendpages' => 'DeadendPagesPage',
  54                 'DoubleRedirects' => 'DoubleRedirectsPage',
  55                 'Longpages' => 'LongPagesPage',
  56                 'Ancientpages' => 'AncientPagesPage',
  57                 'Lonelypages' => 'LonelyPagesPage',
  58                 'Fewestrevisions' => 'FewestrevisionsPage',
  59                 'Withoutinterwiki' => 'WithoutInterwikiPage',
  60                 'Protectedpages' => 'SpecialProtectedpages',
  61                 'Protectedtitles' => 'SpecialProtectedtitles',
  62                 'Shortpages' => 'ShortPagesPage',
  63                 'Uncategorizedcategories' => 'UncategorizedCategoriesPage',
  64                 'Uncategorizedimages' => 'UncategorizedImagesPage',
  65                 'Uncategorizedpages' => 'UncategorizedPagesPage',
  66                 'Uncategorizedtemplates' => 'UncategorizedTemplatesPage',
  67                 'Unusedcategories' => 'UnusedCategoriesPage',
  68                 'Unusedimages' => 'UnusedimagesPage',
  69                 'Unusedtemplates' => 'UnusedtemplatesPage',
  70                 'Unwatchedpages' => 'UnwatchedpagesPage',
  71                 'Wantedcategories' => 'WantedCategoriesPage',
  72                 'Wantedfiles' => 'WantedFilesPage',
  73                 'Wantedpages' => 'WantedPagesPage',
  74                 'Wantedtemplates' => 'WantedTemplatesPage',
  75
  76                 // List of pages
  77                 'Allpages' => 'SpecialAllPages',
  78                 'Prefixindex' => 'SpecialPrefixindex',
  79                 'Categories' => 'SpecialCategories',
  80                 'Listredirects' => 'ListredirectsPage',
  81                 'PagesWithProp' => 'SpecialPagesWithProp',
  82                 'TrackingCategories' => 'SpecialTrackingCategories',
  83
  84                 // Login/create account
  85                 'Userlogin' => 'LoginForm',
  86                 'CreateAccount' => 'SpecialCreateAccount',
  87
  88                 // Users and rights
  89                 'Block' => 'SpecialBlock',
  90                 'Unblock' => 'SpecialUnblock',
  91                 'BlockList' => 'SpecialBlockList',
  92                 'ChangePassword' => 'SpecialChangePassword',
  93                 'PasswordReset' => 'SpecialPasswordReset',
  94                 'DeletedContributions' => 'DeletedContributionsPage',
  95                 'Preferences' => 'SpecialPreferences',
  96                 'ResetTokens' => 'SpecialResetTokens',
  97                 'Contributions' => 'SpecialContributions',
  98                 'Listgrouprights' => 'SpecialListGroupRights',
  99                 'Listusers' => 'SpecialListUsers',
 100                 'Listadmins' => 'SpecialListAdmins',
 101                 'Listbots' => 'SpecialListBots',
 102                 'Userrights' => 'UserrightsPage',
 103                 'EditWatchlist' => 'SpecialEditWatchlist',
 104
 105                 // Recent changes and logs
 106                 'Newimages' => 'SpecialNewFiles',
 107                 'Log' => 'SpecialLog',
 108                 'Watchlist' => 'SpecialWatchlist',
 109                 'Newpages' => 'SpecialNewpages',
 110                 'Recentchanges' => 'SpecialRecentChanges',
 111                 'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 112                 'Tags' => 'SpecialTags',
 113
 114                 // Media reports and uploads
 115                 'Listfiles' => 'SpecialListFiles',
 116                 'Filepath' => 'SpecialFilepath',
 117                 'MediaStatistics' => 'MediaStatisticsPage',
 118                 'MIMEsearch' => 'MIMEsearchPage',
 119                 'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 120                 'Upload' => 'SpecialUpload',
 121                 'UploadStash' => 'SpecialUploadStash',
 122                 'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 123
 124                 // Data and tools
 125                 'Statistics' => 'SpecialStatistics',
 126                 'Allmessages' => 'SpecialAllMessages',
 127                 'Version' => 'SpecialVersion',
 128                 'Lockdb' => 'SpecialLockdb',
 129                 'Unlockdb' => 'SpecialUnlockdb',
 130
 131                 // Redirecting special pages
 132                 'LinkSearch' => 'LinkSearchPage',
 133                 'Randompage' => 'RandomPage',
 134                 'RandomInCategory' => 'SpecialRandomInCategory',
 135                 'Randomredirect' => 'SpecialRandomredirect',
 136
 137                 // High use pages
 138                 'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 139                 'Mostimages' => 'MostimagesPage',
 140                 'Mostinterwikis' => 'MostinterwikisPage',
 141                 'Mostlinked' => 'MostlinkedPage',
 142                 'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 143                 'Mostcategories' => 'MostcategoriesPage',
 144                 'Mostrevisions' => 'MostrevisionsPage',
 145
 146                 // Page tools
 147                 'ComparePages' => 'SpecialComparePages',
 148                 'Export' => 'SpecialExport',
 149                 'Import' => 'SpecialImport',
 150                 'Undelete' => 'SpecialUndelete',
 151                 'Whatlinkshere' => 'SpecialWhatLinksHere',
 152                 'MergeHistory' => 'SpecialMergeHistory',
 153                 'ExpandTemplates' => 'SpecialExpandTemplates',
 154
 155                 // Other
 156                 'Booksources' => 'SpecialBookSources',
 157
 158                 // Unlisted / redirects
 159                 'ApiHelp' => 'SpecialApiHelp',
 160                 'Blankpage' => 'SpecialBlankpage',
 161                 'Diff' => 'SpecialDiff',
 162                 'Emailuser' => 'SpecialEmailUser',
 163                 'Movepage' => 'MovePageForm',
 164                 'Mycontributions' => 'SpecialMycontributions',
 165                 'MyLanguage' => 'SpecialMyLanguage',
 166                 'Mypage' => 'SpecialMypage',
 167                 'Mytalk' => 'SpecialMytalk',
 168                 'Myuploads' => 'SpecialMyuploads',
 169                 'AllMyUploads' => 'SpecialAllMyUploads',
 170                 'PermanentLink' => 'SpecialPermanentLink',
 171                 'Redirect' => 'SpecialRedirect',
 172                 'Revisiondelete' => 'SpecialRevisionDelete',
 173                 'RunJobs' => 'SpecialRunJobs',
 174                 'Specialpages' => 'SpecialSpecialpages',
 175                 'Userlogout' => 'SpecialUserlogout',
 176         );
 177
 178         private static $list;
 179         private static $aliases;
 180
 181         /**
 182          * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 183          * the internal list has already been initialized, e.g. during testing.
 184          */
 185         public static function resetList() {
 186                 self::$list = null;
 187                 self::$aliases = null;
 188         }
 189
 190         /**
 191          * Returns a list of canonical special page names.
 192          * May be used to iterate over all registered special pages.
 193          *
 194          * @return string[]
 195          */
 196         public static function getNames() {
 197                 return array_keys( self::getPageList() );
 198         }
 199
 200         /**
 201          * Get the special page list as an array
 202          *
 203          * @deprecated since 1.24, use getNames() instead.
 204          * @return array
 205          */
 206         public static function getList() {
 207                 wfDeprecated( __FUNCTION__, '1.24' );
 208                 return self::getPageList();
 209         }
 210
 211         /**
 212          * Get the special page list as an array
 213          *
 214          * @return array
 215          */
 216         private static function getPageList() {
 217                 global $wgSpecialPages;
 218                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 219                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 220                 global $wgPageLanguageUseDB;
 221
 222                 if ( !is_array( self::$list ) ) {
 223                         wfProfileIn( __METHOD__ );
 224
 225                         self::$list = self::$coreList;
 226
 227                         if ( !$wgDisableCounters ) {
 228                                 self::$list['Popularpages'] = 'PopularPagesPage';
 229                         }
 230
 231                         if ( !$wgDisableInternalSearch ) {
 232                                 self::$list['Search'] = 'SpecialSearch';
 233                         }
 234
 235                         if ( $wgEmailAuthentication ) {
 236                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 237                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 238                         }
 239
 240                         if ( $wgEnableEmail ) {
 241                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 242                         }
 243
 244                         if ( $wgEnableJavaScriptTest ) {
 245                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 246                         }
 247
 248                         if ( $wgPageLanguageUseDB ) {
 249                                 self::$list['PageLanguage'] = 'SpecialPageLanguage';
 250                         }
 251
 252                         self::$list['Activeusers'] = 'SpecialActiveUsers';
 253
 254                         // Add extension special pages
 255                         self::$list = array_merge( self::$list, $wgSpecialPages );
 256
 257                         // Run hooks
 258                         // This hook can be used to remove undesired built-in special pages
 259                         wfRunHooks( 'SpecialPage_initList', array( &self::$list ) );
 260
 261                         wfProfileOut( __METHOD__ );
 262                 }
 263
 264                 return self::$list;
 265         }
 266
 267         /**
 268          * Initialise and return the list of special page aliases.  Returns an object with
 269          * properties which can be accessed $obj->pagename - each property name is an
 270          * alias, with the value being the canonical name of the special page. All
 271          * registered special pages are guaranteed to map to themselves.
 272          * @return object
 273          */
 274         private static function getAliasListObject() {
 275                 if ( !is_object( self::$aliases ) ) {
 276                         global $wgContLang;
 277                         $aliases = $wgContLang->getSpecialPageAliases();
 278                         $pageList = self::getPageList();
 279
 280                         self::$aliases = array();
 281                         $keepAlias = array();
 282
 283                         // Force every canonical name to be an alias for itself.
 284                         foreach ( $pageList as $name => $stuff ) {
 285                                 $caseFoldedAlias = $wgContLang->caseFold( $name );
 286                                 self::$aliases[$caseFoldedAlias] = $name;
 287                                 $keepAlias[$caseFoldedAlias] = 'canonical';
 288                         }
 289
 290                         // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 291                         if ( is_array( $aliases ) ) {
 292                                 foreach ( $aliases as $realName => $aliasList ) {
 293                                         $aliasList = array_values( $aliasList );
 294                                         foreach ( $aliasList as $i => $alias ) {
 295                                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 296
 297                                                 if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 298                                                         $realName === self::$aliases[$caseFoldedAlias]
 299                                                 ) {
 300                                                         // Ignore same-realName conflicts
 301                                                         continue;
 302                                                 }
 303
 304                                                 if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 305                                                         self::$aliases[$caseFoldedAlias] = $realName;
 306                                                         if ( !$i ) {
 307                                                                 $keepAlias[$caseFoldedAlias] = 'first';
 308                                                         }
 309                                                 } elseif ( !$i ) {
 310                                                         wfWarn( "First alias '$alias' for $realName conflicts with " .
 311                                                                 "{$keepAlias[$caseFoldedAlias]} alias for " .
 312                                                                 self::$aliases[$caseFoldedAlias]
 313                                                         );
 314                                                 }
 315                                         }
 316                                 }
 317                         }
 318
 319                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 320                         self::$aliases = (object)self::$aliases;
 321                 }
 322
 323                 return self::$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( ' ', '_', $caseFoldedAlias );
 340                 if ( isset( self::getAliasListObject()->$caseFoldedAlias ) ) {
 341                         $name = self::getAliasListObject()->$caseFoldedAlias;
 342                 } else {
 343                         return array( null, null );
 344                 }
 345
 346                 if ( !isset( $bits[1] ) ) { // bug 2087
 347                         $par = null;
 348                 } else {
 349                         $par = $bits[1];
 350                 }
 351
 352                 return array( $name, $par );
 353         }
 354
 355         /**
 356          * Add a page to a certain display group for Special:SpecialPages
 357          *
 358          * @param SpecialPage|string $page
 359          * @param string $group
 360          * @deprecated since 1.21 Override SpecialPage::getGroupName
 361          */
 362         public static function setGroup( $page, $group ) {
 363                 wfDeprecated( __METHOD__, '1.21' );
 364
 365                 global $wgSpecialPageGroups;
 366                 $name = is_object( $page ) ? $page->getName() : $page;
 367                 $wgSpecialPageGroups[$name] = $group;
 368         }
 369
 370         /**
 371          * Get the group that the special page belongs in on Special:SpecialPage
 372          *
 373          * @param SpecialPage $page
 374          * @return string
 375          * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
 376          */
 377         public static function getGroup( &$page ) {
 378                 wfDeprecated( __METHOD__, '1.21' );
 379
 380                 return $page->getFinalGroupName();
 381         }
 382
 383         /**
 384          * Check if a given name exist as a special page or as a special page alias
 385          *
 386          * @param string $name Name of a special page
 387          * @return bool True if a special page exists with this name
 388          */
 389         public static function exists( $name ) {
 390                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 391
 392                 $specialPageList = self::getPageList();
 393                 return isset( $specialPageList[$title] );
 394         }
 395
 396         /**
 397          * Find the object with a given name and return it (or NULL)
 398          *
 399          * @param string $name Special page name, may be localised and/or an alias
 400          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 401          */
 402         public static function getPage( $name ) {
 403                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 404
 405                 $specialPageList = self::getPageList();
 406
 407                 if ( isset( $specialPageList[$realName] ) ) {
 408                         $rec = $specialPageList[$realName];
 409
 410                         if ( is_callable( $rec ) ) {
 411                                 // Use callback to instantiate the special page
 412                                 $page = call_user_func( $rec );
 413                         } elseif ( is_string( $rec ) ) {
 414                                 $className = $rec;
 415                                 $page = new $className;
 416                         } elseif ( is_array( $rec ) ) {
 417                                 $className = array_shift( $rec );
 418                                 // @deprecated, officially since 1.18, unofficially since forever
 419                                 wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 420                                         "define a subclass of SpecialPage instead.", '1.18' );
 421                                 $page = MWFunction::newObj( $className, $rec );
 422                         } elseif ( $rec instanceof SpecialPage ) {
 423                                 $page = $rec; //XXX: we should deep clone here
 424                         } else {
 425                                 $page = null;
 426                         }
 427
 428                         if ( $page instanceof SpecialPage ) {
 429                                 return $page;
 430                         } else {
 431                                 // It's not a classname, nor a callback, nor a legacy constructor array,
 432                                 // nor a special page object. Give up.
 433                                 wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 434                                 return null;
 435                         }
 436
 437                 } else {
 438                         return null;
 439                 }
 440         }
 441
 442         /**
 443          * Return categorised listable special pages which are available
 444          * for the current user, and everyone.
 445          *
 446          * @param User $user User object to check permissions, $wgUser will be used
 447          *        if not provided
 448          * @return array ( string => Specialpage )
 449          */
 450         public static function getUsablePages( User $user = null ) {
 451                 $pages = array();
 452                 if ( $user === null ) {
 453                         global $wgUser;
 454                         $user = $wgUser;
 455                 }
 456                 foreach ( self::getPageList() as $name => $rec ) {
 457                         $page = self::getPage( $name );
 458                         if ( $page ) { // not null
 459                                 $page->setContext( RequestContext::getMain() );
 460                                 if ( $page->isListed()
 461                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 462                                 ) {
 463                                         $pages[$name] = $page;
 464                                 }
 465                         }
 466                 }
 467
 468                 return $pages;
 469         }
 470
 471         /**
 472          * Return categorised listable special pages for all users
 473          *
 474          * @return array ( string => Specialpage )
 475          */
 476         public static function getRegularPages() {
 477                 $pages = array();
 478                 foreach ( self::getPageList() as $name => $rec ) {
 479                         $page = self::getPage( $name );
 480                         if ( $page->isListed() && !$page->isRestricted() ) {
 481                                 $pages[$name] = $page;
 482                         }
 483                 }
 484
 485                 return $pages;
 486         }
 487
 488         /**
 489          * Return categorised listable special pages which are available
 490          * for the current user, but not for everyone
 491          *
 492          * @param User|null $user User object to use or null for $wgUser
 493          * @return array ( string => Specialpage )
 494          */
 495         public static function getRestrictedPages( User $user = null ) {
 496                 $pages = array();
 497                 if ( $user === null ) {
 498                         global $wgUser;
 499                         $user = $wgUser;
 500                 }
 501                 foreach ( self::getPageList() as $name => $rec ) {
 502                         $page = self::getPage( $name );
 503                         if (
 504                                 $page->isListed()
 505                                 && $page->isRestricted()
 506                                 && $page->userCanExecute( $user )
 507                         ) {
 508                                 $pages[$name] = $page;
 509                         }
 510                 }
 511
 512                 return $pages;
 513         }
 514
 515         /**
 516          * Execute a special page path.
 517          * The path may contain parameters, e.g. Special:Name/Params
 518          * Extracts the special page name and call the execute method, passing the parameters
 519          *
 520          * Returns a title object if the page is redirected, false if there was no such special
 521          * page, and true if it was successful.
 522          *
 523          * @param Title $title
 524          * @param IContextSource $context
 525          * @param bool $including Bool output is being captured for use in {{special:whatever}}
 526          *
 527          * @return bool
 528          */
 529         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 530                 wfProfileIn( __METHOD__ );
 531
 532                 // @todo FIXME: Redirects broken due to this call
 533                 $bits = explode( '/', $title->getDBkey(), 2 );
 534                 $name = $bits[0];
 535                 if ( !isset( $bits[1] ) ) { // bug 2087
 536                         $par = null;
 537                 } else {
 538                         $par = $bits[1];
 539                 }
 540                 $page = self::getPage( $name );
 541                 // Nonexistent?
 542                 if ( !$page ) {
 543                         $context->getOutput()->setArticleRelated( false );
 544                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 545
 546                         global $wgSend404Code;
 547                         if ( $wgSend404Code ) {
 548                                 $context->getOutput()->setStatusCode( 404 );
 549                         }
 550
 551                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 552                         wfProfileOut( __METHOD__ );
 553
 554                         return false;
 555                 }
 556
 557                 // Page exists, set the context
 558                 $page->setContext( $context );
 559
 560                 if ( !$including ) {
 561                         // Redirect to canonical alias for GET commands
 562                         // Not for POST, we'd lose the post data, so it's best to just distribute
 563                         // the request. Such POST requests are possible for old extensions that
 564                         // generate self-links without being aware that their default name has
 565                         // changed.
 566                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 567                                 $query = $context->getRequest()->getQueryValues();
 568                                 unset( $query['title'] );
 569                                 $title = $page->getPageTitle( $par );
 570                                 $url = $title->getFullURL( $query );
 571                                 $context->getOutput()->redirect( $url );
 572                                 wfProfileOut( __METHOD__ );
 573
 574                                 return $title;
 575                         } else {
 576                                 $context->setTitle( $page->getPageTitle( $par ) );
 577                         }
 578                 } elseif ( !$page->isIncludable() ) {
 579                         wfProfileOut( __METHOD__ );
 580
 581                         return false;
 582                 }
 583
 584                 $page->including( $including );
 585
 586                 // Execute special page
 587                 $profName = 'Special:' . $page->getName();
 588                 wfProfileIn( $profName );
 589                 $page->run( $par );
 590                 wfProfileOut( $profName );
 591                 wfProfileOut( __METHOD__ );
 592
 593                 return true;
 594         }
 595
 596         /**
 597          * Just like executePath() but will override global variables and execute
 598          * the page in "inclusion" mode. Returns true if the execution was
 599          * successful or false if there was no such special page, or a title object
 600          * if it was a redirect.
 601          *
 602          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 603          * variables so that the special page will get the context it'd expect on a
 604          * normal request, and then restores them to their previous values after.
 605          *
 606          * @param Title $title
 607          * @param IContextSource $context
 608          * @return string HTML fragment
 609          */
 610         public static function capturePath( Title $title, IContextSource $context ) {
 611                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 612
 613                 // Save current globals
 614                 $oldTitle = $wgTitle;
 615                 $oldOut = $wgOut;
 616                 $oldRequest = $wgRequest;
 617                 $oldUser = $wgUser;
 618                 $oldLang = $wgLang;
 619
 620                 // Set the globals to the current context
 621                 $wgTitle = $title;
 622                 $wgOut = $context->getOutput();
 623                 $wgRequest = $context->getRequest();
 624                 $wgUser = $context->getUser();
 625                 $wgLang = $context->getLanguage();
 626
 627                 // The useful part
 628                 $ret = self::executePath( $title, $context, true );
 629
 630                 // And restore the old globals
 631                 $wgTitle = $oldTitle;
 632                 $wgOut = $oldOut;
 633                 $wgRequest = $oldRequest;
 634                 $wgUser = $oldUser;
 635                 $wgLang = $oldLang;
 636
 637                 return $ret;
 638         }
 639
 640         /**
 641          * Get the local name for a specified canonical name
 642          *
 643          * @param string $name
 644          * @param string|bool $subpage
 645          * @return string
 646          */
 647         public static function getLocalNameFor( $name, $subpage = false ) {
 648                 global $wgContLang;
 649                 $aliases = $wgContLang->getSpecialPageAliases();
 650                 $aliasList = self::getAliasListObject();
 651
 652                 // Find the first alias that maps back to $name
 653                 if ( isset( $aliases[$name] ) ) {
 654                         $found = false;
 655                         foreach ( $aliases[$name] as $alias ) {
 656                                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 657                                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 658                                 if ( isset( $aliasList->$caseFoldedAlias ) &&
 659                                         $aliasList->$caseFoldedAlias === $name
 660                                 ) {
 661                                         $name = $alias;
 662                                         $found = true;
 663                                         break;
 664                                 }
 665                         }
 666                         if ( !$found ) {
 667                                 wfWarn( "Did not find a usable alias for special page '$name'. " .
 668                                         "It seems all defined aliases conflict?" );
 669                         }
 670                 } else {
 671                         // Check if someone misspelled the correct casing
 672                         if ( is_array( $aliases ) ) {
 673                                 foreach ( $aliases as $n => $values ) {
 674                                         if ( strcasecmp( $name, $n ) === 0 ) {
 675                                                 wfWarn( "Found alias defined for $n when searching for " .
 676                                                         "special page aliases for $name. Case mismatch?" );
 677                                                 return self::getLocalNameFor( $n, $subpage );
 678                                         }
 679                                 }
 680                         }
 681
 682                         wfWarn( "Did not find alias for special page '$name'. " .
 683                                 "Perhaps no aliases are defined for it?" );
 684                 }
 685
 686                 if ( $subpage !== false && !is_null( $subpage ) ) {
 687                         $name = "$name/$subpage";
 688                 }
 689
 690                 return $wgContLang->ucfirst( $name );
 691         }
 692
 693         /**
 694          * Get a title for a given alias
 695          *
 696          * @param string $alias
 697          * @return Title|null Title or null if there is no such alias
 698          */
 699         public static function getTitleForAlias( $alias ) {
 700                 list( $name, $subpage ) = self::resolveAlias( $alias );
 701                 if ( $name != null ) {
 702                         return SpecialPage::getTitleFor( $name, $subpage );
 703                 } else {
 704                         return null;
 705                 }
 706         }
 707 }