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   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 $list = array(
  51          // Maintenance Reports
  52          'BrokenRedirects' => 'BrokenRedirectsPage',
  53          'Deadendpages' => 'DeadendPagesPage',
  54          'DoubleRedirects' => 'DoubleRedirectsPage',
  55          'Longpages' => 'LongPagesPage',
  56          'Ancientpages' => 'AncientPagesPage',
  57          'Lonelypages' => 'LonelyPagesPage',
  58          'Fewestrevisions' => 'FewestrevisionsPage',
  59          'Withoutinterwiki' => 'WithoutInterwikiPage',
  60          'Protectedpages' => 'SpecialProtectedpages',
  61          'Protectedtitles' => 'SpecialProtectedtitles',
  62          'Shortpages' => 'ShortpagesPage',
  63          'Uncategorizedcategories' => 'UncategorizedCategoriesPage',
  64          'Uncategorizedimages' => 'UncategorizedImagesPage',
  65          'Uncategorizedpages' => 'UncategorizedPagesPage',
  66          'Uncategorizedtemplates' => 'UncategorizedTemplatesPage',
  67          'Unusedcategories' => 'UnusedCategoriesPage',
  68          'Unusedimages' => 'UnusedimagesPage',
  69          'Unusedtemplates' => 'UnusedtemplatesPage',
  70          'Unwatchedpages' => 'UnwatchedpagesPage',
  71          'Wantedcategories' => 'WantedCategoriesPage',
  72          'Wantedfiles' => 'WantedFilesPage',
  73          'Wantedpages' => 'WantedPagesPage',
  74          'Wantedtemplates' => 'WantedTemplatesPage',
  75  
  76          // List of pages
  77          'Allpages' => 'SpecialAllpages',
  78          'Prefixindex' => 'SpecialPrefixindex',
  79          'Categories' => 'SpecialCategories',
  80          'Listredirects' => 'ListredirectsPage',
  81          'PagesWithProp' => 'SpecialPagesWithProp',
  82          'TrackingCategories' => 'SpecialTrackingCategories',
  83  
  84          // Login/create account
  85          'Userlogin' => 'LoginForm',
  86          'CreateAccount' => 'SpecialCreateAccount',
  87  
  88          // Users and rights
  89          'Block' => 'SpecialBlock',
  90          'Unblock' => 'SpecialUnblock',
  91          'BlockList' => 'SpecialBlockList',
  92          'ChangePassword' => 'SpecialChangePassword',
  93          'PasswordReset' => 'SpecialPasswordReset',
  94          'DeletedContributions' => 'DeletedContributionsPage',
  95          'Preferences' => 'SpecialPreferences',
  96          'ResetTokens' => 'SpecialResetTokens',
  97          'Contributions' => 'SpecialContributions',
  98          'Listgrouprights' => 'SpecialListGroupRights',
  99          'Listusers' => 'SpecialListUsers',
 100          'Listadmins' => 'SpecialListAdmins',
 101          'Listbots' => 'SpecialListBots',
 102          'Userrights' => 'UserrightsPage',
 103          'EditWatchlist' => 'SpecialEditWatchlist',
 104  
 105          // Recent changes and logs
 106          'Newimages' => 'SpecialNewFiles',
 107          'Log' => 'SpecialLog',
 108          'Watchlist' => 'SpecialWatchlist',
 109          'Newpages' => 'SpecialNewpages',
 110          'Recentchanges' => 'SpecialRecentChanges',
 111          'Recentchangeslinked' => 'SpecialRecentChangesLinked',
 112          'Tags' => 'SpecialTags',
 113  
 114          // Media reports and uploads
 115          'Listfiles' => 'SpecialListFiles',
 116          'Filepath' => 'SpecialFilepath',
 117          'MediaStatistics' => 'MediaStatisticsPage',
 118          'MIMEsearch' => 'MIMEsearchPage',
 119          'FileDuplicateSearch' => 'FileDuplicateSearchPage',
 120          'Upload' => 'SpecialUpload',
 121          'UploadStash' => 'SpecialUploadStash',
 122          'ListDuplicatedFiles' => 'ListDuplicatedFilesPage',
 123  
 124          // Data and tools
 125          'Statistics' => 'SpecialStatistics',
 126          'Allmessages' => 'SpecialAllmessages',
 127          'Version' => 'SpecialVersion',
 128          'Lockdb' => 'SpecialLockdb',
 129          'Unlockdb' => 'SpecialUnlockdb',
 130  
 131          // Redirecting special pages
 132          'LinkSearch' => 'LinkSearchPage',
 133          'Randompage' => 'RandomPage',
 134          'RandomInCategory' => 'SpecialRandomInCategory',
 135          'Randomredirect' => 'SpecialRandomredirect',
 136  
 137          // High use pages
 138          'Mostlinkedcategories' => 'MostlinkedCategoriesPage',
 139          'Mostimages' => 'MostimagesPage',
 140          'Mostinterwikis' => 'MostinterwikisPage',
 141          'Mostlinked' => 'MostlinkedPage',
 142          'Mostlinkedtemplates' => 'MostlinkedTemplatesPage',
 143          'Mostcategories' => 'MostcategoriesPage',
 144          'Mostrevisions' => 'MostrevisionsPage',
 145  
 146          // Page tools
 147          'ComparePages' => 'SpecialComparePages',
 148          'Export' => 'SpecialExport',
 149          'Import' => 'SpecialImport',
 150          'Undelete' => 'SpecialUndelete',
 151          'Whatlinkshere' => 'SpecialWhatLinksHere',
 152          'MergeHistory' => 'SpecialMergeHistory',
 153          'ExpandTemplates' => 'SpecialExpandTemplates',
 154  
 155          // Other
 156          'Booksources' => 'SpecialBookSources',
 157  
 158          // Unlisted / redirects
 159          'Blankpage' => 'SpecialBlankpage',
 160          'Diff' => 'SpecialDiff',
 161          'Emailuser' => 'SpecialEmailUser',
 162          'Movepage' => 'MovePageForm',
 163          'Mycontributions' => 'SpecialMycontributions',
 164          'MyLanguage' => 'SpecialMyLanguage',
 165          'Mypage' => 'SpecialMypage',
 166          'Mytalk' => 'SpecialMytalk',
 167          'Myuploads' => 'SpecialMyuploads',
 168          'AllMyUploads' => 'SpecialAllMyUploads',
 169          'PermanentLink' => 'SpecialPermanentLink',
 170          'Redirect' => 'SpecialRedirect',
 171          'Revisiondelete' => 'SpecialRevisionDelete',
 172          'RunJobs' => 'SpecialRunJobs',
 173          'Specialpages' => 'SpecialSpecialpages',
 174          'Userlogout' => 'SpecialUserlogout',
 175      );
 176  
 177      private static $aliases;
 178  
 179      /**
 180       * Reset the internal list of special pages. Useful when changing $wgSpecialPages after
 181       * the internal list has already been initialized, e.g. during testing.
 182       */
 183  	public static function resetList() {
 184          self::$list = null;
 185          self::$aliases = null;
 186      }
 187  
 188      /**
 189       * Returns a list of canonical special page names.
 190       * May be used to iterate over all registered special pages.
 191       *
 192       * @return string[]
 193       */
 194  	public static function getNames() {
 195          return array_keys( self::getPageList() );
 196      }
 197  
 198      /**
 199       * Get the special page list as an array
 200       *
 201       * @deprecated since 1.24, use getNames() instead.
 202       * @return array
 203       */
 204  	public static function getList() {
 205          wfDeprecated( __FUNCTION__, '1.24' );
 206          return self::getPageList();
 207      }
 208  
 209      /**
 210       * Get the special page list as an array
 211       *
 212       * @return array
 213       */
 214  	private static function getPageList() {
 215          global $wgSpecialPages;
 216          global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 217          global $wgEnableEmail, $wgEnableJavaScriptTest;
 218          global $wgPageLanguageUseDB;
 219  
 220          if ( !is_object( self::$list ) ) {
 221              wfProfileIn( __METHOD__ );
 222  
 223              if ( !$wgDisableCounters ) {
 224                  self::$list['Popularpages'] = 'PopularPagesPage';
 225              }
 226  
 227              if ( !$wgDisableInternalSearch ) {
 228                  self::$list['Search'] = 'SpecialSearch';
 229              }
 230  
 231              if ( $wgEmailAuthentication ) {
 232                  self::$list['Confirmemail'] = 'EmailConfirmation';
 233                  self::$list['Invalidateemail'] = 'EmailInvalidation';
 234              }
 235  
 236              if ( $wgEnableEmail ) {
 237                  self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 238              }
 239  
 240              if ( $wgEnableJavaScriptTest ) {
 241                  self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 242              }
 243  
 244              if ( $wgPageLanguageUseDB ) {
 245                  self::$list['PageLanguage'] = 'SpecialPageLanguage';
 246              }
 247  
 248              self::$list['Activeusers'] = 'SpecialActiveUsers';
 249  
 250              // Add extension special pages
 251              self::$list = array_merge( self::$list, $wgSpecialPages );
 252  
 253              // Run hooks
 254              // This hook can be used to remove undesired built-in special pages
 255              wfRunHooks( 'SpecialPage_initList', array( &self::$list ) );
 256  
 257              wfProfileOut( __METHOD__ );
 258          }
 259  
 260          return self::$list;
 261      }
 262  
 263      /**
 264       * Initialise and return the list of special page aliases.  Returns an object with
 265       * properties which can be accessed $obj->pagename - each property name is an
 266       * alias, with the value being the canonical name of the special page. All
 267       * registered special pages are guaranteed to map to themselves.
 268       * @return object
 269       */
 270  	private static function getAliasListObject() {
 271          if ( !is_object( self::$aliases ) ) {
 272              global $wgContLang;
 273              $aliases = $wgContLang->getSpecialPageAliases();
 274  
 275              self::$aliases = array();
 276              $keepAlias = array();
 277  
 278              // Force every canonical name to be an alias for itself.
 279              foreach ( self::getPageList() as $name => $stuff ) {
 280                  $caseFoldedAlias = $wgContLang->caseFold( $name );
 281                  self::$aliases[$caseFoldedAlias] = $name;
 282                  $keepAlias[$caseFoldedAlias] = 'canonical';
 283              }
 284  
 285              // Check for $aliases being an array since Language::getSpecialPageAliases can return null
 286              if ( is_array( $aliases ) ) {
 287                  foreach ( $aliases as $realName => $aliasList ) {
 288                      $aliasList = array_values( $aliasList );
 289                      foreach ( $aliasList as $i => $alias ) {
 290                          $caseFoldedAlias = $wgContLang->caseFold( $alias );
 291  
 292                          if ( isset( self::$aliases[$caseFoldedAlias] ) &&
 293                              $realName === self::$aliases[$caseFoldedAlias]
 294                          ) {
 295                              // Ignore same-realName conflicts
 296                              continue;
 297                          }
 298  
 299                          if ( !isset( $keepAlias[$caseFoldedAlias] ) ) {
 300                              self::$aliases[$caseFoldedAlias] = $realName;
 301                              if ( !$i ) {
 302                                  $keepAlias[$caseFoldedAlias] = 'first';
 303                              }
 304                          } elseif ( !$i ) {
 305                              wfWarn( "First alias '$alias' for $realName conflicts with " .
 306                                  "{$keepAlias[$caseFoldedAlias]} alias for " .
 307                                  self::$aliases[$caseFoldedAlias]
 308                              );
 309                          }
 310                      }
 311                  }
 312              }
 313  
 314              // Cast to object: func()[$key] doesn't work, but func()->$key does
 315              self::$aliases = (object)self::$aliases;
 316          }
 317  
 318          return self::$aliases;
 319      }
 320  
 321      /**
 322       * Given a special page name with a possible subpage, return an array
 323       * where the first element is the special page name and the second is the
 324       * subpage.
 325       *
 326       * @param string $alias
 327       * @return array Array( String, String|null ), or array( null, null ) if the page is invalid
 328       */
 329  	public static function resolveAlias( $alias ) {
 330          global $wgContLang;
 331          $bits = explode( '/', $alias, 2 );
 332  
 333          $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 334          $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 335          if ( isset( self::getAliasListObject()->$caseFoldedAlias ) ) {
 336              $name = self::getAliasListObject()->$caseFoldedAlias;
 337          } else {
 338              return array( null, null );
 339          }
 340  
 341          if ( !isset( $bits[1] ) ) { // bug 2087
 342              $par = null;
 343          } else {
 344              $par = $bits[1];
 345          }
 346  
 347          return array( $name, $par );
 348      }
 349  
 350      /**
 351       * Add a page to a certain display group for Special:SpecialPages
 352       *
 353       * @param SpecialPage|string $page
 354       * @param string $group
 355       * @deprecated since 1.21 Override SpecialPage::getGroupName
 356       */
 357  	public static function setGroup( $page, $group ) {
 358          wfDeprecated( __METHOD__, '1.21' );
 359  
 360          global $wgSpecialPageGroups;
 361          $name = is_object( $page ) ? $page->getName() : $page;
 362          $wgSpecialPageGroups[$name] = $group;
 363      }
 364  
 365      /**
 366       * Get the group that the special page belongs in on Special:SpecialPage
 367       *
 368       * @param SpecialPage $page
 369       * @return string
 370       * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
 371       */
 372  	public static function getGroup( &$page ) {
 373          wfDeprecated( __METHOD__, '1.21' );
 374  
 375          return $page->getFinalGroupName();
 376      }
 377  
 378      /**
 379       * Check if a given name exist as a special page or as a special page alias
 380       *
 381       * @param string $name Name of a special page
 382       * @return bool True if a special page exists with this name
 383       */
 384  	public static function exists( $name ) {
 385          list( $title, /*...*/ ) = self::resolveAlias( $name );
 386  
 387          $specialPageList = self::getPageList();
 388          return isset( $specialPageList[$title] );
 389      }
 390  
 391      /**
 392       * Find the object with a given name and return it (or NULL)
 393       *
 394       * @param string $name Special page name, may be localised and/or an alias
 395       * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 396       */
 397  	public static function getPage( $name ) {
 398          list( $realName, /*...*/ ) = self::resolveAlias( $name );
 399  
 400          $specialPageList = self::getPageList();
 401  
 402          if ( isset( $specialPageList[$realName] ) ) {
 403              $rec = $specialPageList[$realName];
 404  
 405              if ( is_callable( $rec ) ) {
 406                  // Use callback to instantiate the special page
 407                  $page = call_user_func( $rec );
 408              } elseif ( is_string( $rec ) ) {
 409                  $className = $rec;
 410                  $page = new $className;
 411              } elseif ( is_array( $rec ) ) {
 412                  $className = array_shift( $rec );
 413                  // @deprecated, officially since 1.18, unofficially since forever
 414                  wfDeprecated( "Array syntax for \$wgSpecialPages is deprecated ($className), " .
 415                      "define a subclass of SpecialPage instead.", '1.18' );
 416                  $page = MWFunction::newObj( $className, $rec );
 417              } elseif ( $rec instanceof SpecialPage ) {
 418                  $page = $rec; //XXX: we should deep clone here
 419              } else {
 420                  $page = null;
 421              }
 422  
 423              if ( $page instanceof SpecialPage ) {
 424                  return $page;
 425              } else {
 426                  // It's not a classname, nor a callback, nor a legacy constructor array,
 427                  // nor a special page object. Give up.
 428                  wfLogWarning( "Cannot instantiate special page $realName: bad spec!" );
 429                  return null;
 430              }
 431  
 432          } else {
 433              return null;
 434          }
 435      }
 436  
 437      /**
 438       * Return categorised listable special pages which are available
 439       * for the current user, and everyone.
 440       *
 441       * @param User $user User object to check permissions, $wgUser will be used
 442       *        if not provided
 443       * @return array ( string => Specialpage )
 444       */
 445  	public static function getUsablePages( User $user = null ) {
 446          $pages = array();
 447          if ( $user === null ) {
 448              global $wgUser;
 449              $user = $wgUser;
 450          }
 451          foreach ( self::getPageList() as $name => $rec ) {
 452              $page = self::getPage( $name );
 453              if ( $page ) { // not null
 454                  $page->setContext( RequestContext::getMain() );
 455                  if ( $page->isListed()
 456                      && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 457                  ) {
 458                      $pages[$name] = $page;
 459                  }
 460              }
 461          }
 462  
 463          return $pages;
 464      }
 465  
 466      /**
 467       * Return categorised listable special pages for all users
 468       *
 469       * @return array ( string => Specialpage )
 470       */
 471  	public static function getRegularPages() {
 472          $pages = array();
 473          foreach ( self::getPageList() as $name => $rec ) {
 474              $page = self::getPage( $name );
 475              if ( $page->isListed() && !$page->isRestricted() ) {
 476                  $pages[$name] = $page;
 477              }
 478          }
 479  
 480          return $pages;
 481      }
 482  
 483      /**
 484       * Return categorised listable special pages which are available
 485       * for the current user, but not for everyone
 486       *
 487       * @param User|null $user User object to use or null for $wgUser
 488       * @return array ( string => Specialpage )
 489       */
 490  	public static function getRestrictedPages( User $user = null ) {
 491          $pages = array();
 492          if ( $user === null ) {
 493              global $wgUser;
 494              $user = $wgUser;
 495          }
 496          foreach ( self::getPageList() as $name => $rec ) {
 497              $page = self::getPage( $name );
 498              if (
 499                  $page->isListed()
 500                  && $page->isRestricted()
 501                  && $page->userCanExecute( $user )
 502              ) {
 503                  $pages[$name] = $page;
 504              }
 505          }
 506  
 507          return $pages;
 508      }
 509  
 510      /**
 511       * Execute a special page path.
 512       * The path may contain parameters, e.g. Special:Name/Params
 513       * Extracts the special page name and call the execute method, passing the parameters
 514       *
 515       * Returns a title object if the page is redirected, false if there was no such special
 516       * page, and true if it was successful.
 517       *
 518       * @param Title $title
 519       * @param IContextSource $context
 520       * @param bool $including Bool output is being captured for use in {{special:whatever}}
 521       *
 522       * @return bool
 523       */
 524  	public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 525          wfProfileIn( __METHOD__ );
 526  
 527          // @todo FIXME: Redirects broken due to this call
 528          $bits = explode( '/', $title->getDBkey(), 2 );
 529          $name = $bits[0];
 530          if ( !isset( $bits[1] ) ) { // bug 2087
 531              $par = null;
 532          } else {
 533              $par = $bits[1];
 534          }
 535          $page = self::getPage( $name );
 536          // Nonexistent?
 537          if ( !$page ) {
 538              $context->getOutput()->setArticleRelated( false );
 539              $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 540  
 541              global $wgSend404Code;
 542              if ( $wgSend404Code ) {
 543                  $context->getOutput()->setStatusCode( 404 );
 544              }
 545  
 546              $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 547              wfProfileOut( __METHOD__ );
 548  
 549              return false;
 550          }
 551  
 552          // Page exists, set the context
 553          $page->setContext( $context );
 554  
 555          if ( !$including ) {
 556              // Redirect to canonical alias for GET commands
 557              // Not for POST, we'd lose the post data, so it's best to just distribute
 558              // the request. Such POST requests are possible for old extensions that
 559              // generate self-links without being aware that their default name has
 560              // changed.
 561              if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 562                  $query = $context->getRequest()->getQueryValues();
 563                  unset( $query['title'] );
 564                  $title = $page->getPageTitle( $par );
 565                  $url = $title->getFullURL( $query );
 566                  $context->getOutput()->redirect( $url );
 567                  wfProfileOut( __METHOD__ );
 568  
 569                  return $title;
 570              } else {
 571                  $context->setTitle( $page->getPageTitle( $par ) );
 572              }
 573          } elseif ( !$page->isIncludable() ) {
 574              wfProfileOut( __METHOD__ );
 575  
 576              return false;
 577          }
 578  
 579          $page->including( $including );
 580  
 581          // Execute special page
 582          $profName = 'Special:' . $page->getName();
 583          wfProfileIn( $profName );
 584          $page->run( $par );
 585          wfProfileOut( $profName );
 586          wfProfileOut( __METHOD__ );
 587  
 588          return true;
 589      }
 590  
 591      /**
 592       * Just like executePath() but will override global variables and execute
 593       * the page in "inclusion" mode. Returns true if the execution was
 594       * successful or false if there was no such special page, or a title object
 595       * if it was a redirect.
 596       *
 597       * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 598       * variables so that the special page will get the context it'd expect on a
 599       * normal request, and then restores them to their previous values after.
 600       *
 601       * @param Title $title
 602       * @param IContextSource $context
 603       * @return string HTML fragment
 604       */
 605  	public static function capturePath( Title $title, IContextSource $context ) {
 606          global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 607  
 608          // Save current globals
 609          $oldTitle = $wgTitle;
 610          $oldOut = $wgOut;
 611          $oldRequest = $wgRequest;
 612          $oldUser = $wgUser;
 613          $oldLang = $wgLang;
 614  
 615          // Set the globals to the current context
 616          $wgTitle = $title;
 617          $wgOut = $context->getOutput();
 618          $wgRequest = $context->getRequest();
 619          $wgUser = $context->getUser();
 620          $wgLang = $context->getLanguage();
 621  
 622          // The useful part
 623          $ret = self::executePath( $title, $context, true );
 624  
 625          // And restore the old globals
 626          $wgTitle = $oldTitle;
 627          $wgOut = $oldOut;
 628          $wgRequest = $oldRequest;
 629          $wgUser = $oldUser;
 630          $wgLang = $oldLang;
 631  
 632          return $ret;
 633      }
 634  
 635      /**
 636       * Get the local name for a specified canonical name
 637       *
 638       * @param string $name
 639       * @param string|bool $subpage
 640       * @return string
 641       */
 642  	public static function getLocalNameFor( $name, $subpage = false ) {
 643          global $wgContLang;
 644          $aliases = $wgContLang->getSpecialPageAliases();
 645          $aliasList = self::getAliasListObject();
 646  
 647          // Find the first alias that maps back to $name
 648          if ( isset( $aliases[$name] ) ) {
 649              $found = false;
 650              foreach ( $aliases[$name] as $alias ) {
 651                  $caseFoldedAlias = $wgContLang->caseFold( $alias );
 652                  $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 653                  if ( isset( $aliasList->$caseFoldedAlias ) &&
 654                      $aliasList->$caseFoldedAlias === $name
 655                  ) {
 656                      $name = $alias;
 657                      $found = true;
 658                      break;
 659                  }
 660              }
 661              if ( !$found ) {
 662                  wfWarn( "Did not find a usable alias for special page '$name'. " .
 663                      "It seems all defined aliases conflict?" );
 664              }
 665          } else {
 666              // Check if someone misspelled the correct casing
 667              if ( is_array( $aliases ) ) {
 668                  foreach ( $aliases as $n => $values ) {
 669                      if ( strcasecmp( $name, $n ) === 0 ) {
 670                          wfWarn( "Found alias defined for $n when searching for " .
 671                              "special page aliases for $name. Case mismatch?" );
 672                          return self::getLocalNameFor( $n, $subpage );
 673                      }
 674                  }
 675              }
 676  
 677              wfWarn( "Did not find alias for special page '$name'. " .
 678                  "Perhaps no aliases are defined for it?" );
 679          }
 680  
 681          if ( $subpage !== false && !is_null( $subpage ) ) {
 682              $name = "$name/$subpage";
 683          }
 684  
 685          return $wgContLang->ucfirst( $name );
 686      }
 687  
 688      /**
 689       * Get a title for a given alias
 690       *
 691       * @param string $alias
 692       * @return Title|null Title or null if there is no such alias
 693       */
 694  	public static function getTitleForAlias( $alias ) {
 695          list( $name, $subpage ) = self::resolveAlias( $alias );
 696          if ( $name != null ) {
 697              return SpecialPage::getTitleFor( $name, $subpage );
 698          } else {
 699              return null;
 700          }
 701      }
 702  }