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