includes/SpecialPage.php

   1 <?php
   2 /**
   3  * SpecialPage: handling special pages and lists thereof.
   4  *
   5  * To add a special page in an extension, add to $wgSpecialPages either
   6  * an object instance or an array containing the name and constructor
   7  * parameters. The latter is preferred for performance reasons.
   8  *
   9  * The object instantiated must be either an instance of SpecialPage or a
  10  * sub-class thereof. It must have an execute() method, which sends the HTML
  11  * for the special page to $wgOut. The parent class has an execute() method
  12  * which distributes the call to the historical global functions. Additionally,
  13  * execute() also checks if the user has the necessary access privileges
  14  * and bails out if not.
  15  *
  16  * To add a core special page, use the similar static list in
  17  * SpecialPage::$mList. To remove a core static special page at runtime, use
  18  * a SpecialPage_initList hook.
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24
  25 /**
  26  * Parent special page class, also static functions for handling the special
  27  * page list.
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialPage {
  31         /**#@+
  32          * @access private
  33          */
  34         /**
  35          * The canonical name of this special page
  36          * Also used for the default <h1> heading, @see getDescription()
  37          */
  38         var $mName;
  39         /**
  40          * The local name of this special page
  41          */
  42         var $mLocalName;
  43         /**
  44          * Minimum user level required to access this page, or "" for anyone.
  45          * Also used to categorise the pages in Special:Specialpages
  46          */
  47         var $mRestriction;
  48         /**
  49          * Listed in Special:Specialpages?
  50          */
  51         var $mListed;
  52         /**
  53          * Function name called by the default execute()
  54          */
  55         var $mFunction;
  56         /**
  57          * File which needs to be included before the function above can be called
  58          */
  59         var $mFile;
  60         /**
  61          * Whether or not this special page is being included from an article
  62          */
  63         var $mIncluding;
  64         /**
  65          * Whether the special page can be included in an article
  66          */
  67         var $mIncludable;
  68         /**
  69          * Query parameters that can be passed through redirects
  70          */
  71         var $mAllowedRedirectParams = array();
  72         /**
  73          * Query parameteres added by redirects
  74          */
  75         var $mAddedRedirectParams = array();
  76         /**
  77          * Current request
  78          * @var WebRequest
  79          */
  80         protected $mRequest;
  81         /**
  82          * Current output page
  83          * @var OutputPage
  84          */
  85         protected $mOutput;
  86         /**
  87          * Full title including $par
  88          * @var Title
  89          */
  90         protected $mFullTitle;
  91
  92         /**
  93          * List of special pages, followed by parameters.
  94          * If the only parameter is a string, that is the page name.
  95          * Otherwise, it is an array. The format is one of:
  96          ** array( 'SpecialPage', name, right )
  97          ** array( 'IncludableSpecialPage', name, right, listed? )
  98          ** array( 'UnlistedSpecialPage', name, right )
  99          ** array( 'SpecialRedirectToSpecial', name, page to redirect to, special page param, ... )
 100          */
 101         static public $mList = array(
 102                 # Maintenance Reports
 103                 'BrokenRedirects'           => 'BrokenRedirectsPage',
 104                 'Deadendpages'              => 'DeadendpagesPage',
 105                 'DoubleRedirects'           => 'DoubleRedirectsPage',
 106                 'Longpages'                 => 'LongpagesPage',
 107                 'Ancientpages'              => 'AncientpagesPage',
 108                 'Lonelypages'               => 'LonelypagesPage',
 109                 'Fewestrevisions'           => 'FewestrevisionsPage',
 110                 'Withoutinterwiki'          => 'WithoutinterwikiPage',
 111                 'Protectedpages'            => 'SpecialProtectedpages',
 112                 'Protectedtitles'           => 'SpecialProtectedtitles',
 113                 'Shortpages'                => 'ShortpagesPage',
 114                 'Uncategorizedcategories'   => 'UncategorizedcategoriesPage',
 115                 'Uncategorizedimages'       => 'UncategorizedimagesPage',
 116                 'Uncategorizedpages'        => 'UncategorizedpagesPage',
 117                 'Uncategorizedtemplates'    => 'UncategorizedtemplatesPage',
 118                 'Unusedcategories'          => 'UnusedcategoriesPage',
 119                 'Unusedimages'              => 'UnusedimagesPage',
 120                 'Unusedtemplates'           => 'UnusedtemplatesPage',
 121                 'Unwatchedpages'            => 'UnwatchedpagesPage',
 122                 'Wantedcategories'          => 'WantedcategoriesPage',
 123                 'Wantedfiles'               => 'WantedfilesPage',
 124                 'Wantedpages'               => 'WantedpagesPage',
 125                 'Wantedtemplates'           => 'WantedtemplatesPage',
 126
 127                 # List of pages
 128                 'Allpages'                  => 'SpecialAllpages',
 129                 'Prefixindex'               => 'SpecialPrefixindex',
 130                 'Categories'                => 'SpecialCategories',
 131                 'Disambiguations'           => 'DisambiguationsPage',
 132                 'Listredirects'             => 'ListredirectsPage',
 133
 134                 # Login/create account
 135                 'Userlogin'                 => 'LoginForm',
 136                 'CreateAccount'             => array( 'SpecialRedirectToSpecial', 'CreateAccount', 'Userlogin', 'signup', array( 'uselang' ) ),
 137
 138                 # Users and rights
 139                 'Blockip'                   => 'IPBlockForm',
 140                 'Ipblocklist'               => 'IPUnblockForm',
 141                 'Unblock'                   => array( 'SpecialRedirectToSpecial', 'Unblock', 'Ipblocklist', false, array( 'uselang', 'ip', 'id' ), array( 'action' => 'unblock' ) ),
 142                 'Resetpass'                 => 'SpecialResetpass',
 143                 'DeletedContributions'      => 'DeletedContributionsPage',
 144                 'Preferences'               => 'SpecialPreferences',
 145                 'Contributions'             => 'SpecialContributions',
 146                 'Listgrouprights'           => 'SpecialListGroupRights',
 147                 'Listusers'                 => array( 'SpecialPage', 'Listusers' ),
 148                 'Listadmins'                => array( 'SpecialRedirectToSpecial', 'Listadmins', 'Listusers', 'sysop' ),
 149                 'Listbots'                  => array( 'SpecialRedirectToSpecial', 'Listbots', 'Listusers', 'bot' ),
 150                 'Activeusers'               => 'SpecialActiveUsers',
 151                 'Userrights'                => 'UserrightsPage',
 152                 'DisableAccount'            => 'SpecialDisableAccount',
 153
 154                 # Recent changes and logs
 155                 'Newimages'                 => array( 'IncludableSpecialPage', 'Newimages' ),
 156                 'Log'                       => 'SpecialLog',
 157                 'Watchlist'                 => array( 'SpecialPage', 'Watchlist' ),
 158                 'Newpages'                  => 'SpecialNewpages',
 159                 'Recentchanges'             => 'SpecialRecentchanges',
 160                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 161                 'Tags'                      => 'SpecialTags',
 162
 163                 # Media reports and uploads
 164                 'Listfiles'                 => array( 'SpecialPage', 'Listfiles' ),
 165                 'Filepath'                  => 'SpecialFilepath',
 166                 'MIMEsearch'                => 'MIMEsearchPage',
 167                 'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
 168                 'Upload'                    => 'SpecialUpload',
 169                 'UploadStash'               => 'SpecialUploadStash',
 170
 171                 # Wiki data and tools
 172                 'Statistics'                => 'SpecialStatistics',
 173                 'Allmessages'               => 'SpecialAllmessages',
 174                 'Version'                   => 'SpecialVersion',
 175                 'Lockdb'                    => 'SpecialLockdb',
 176                 'Unlockdb'                  => 'SpecialUnlockdb',
 177
 178                 # Redirecting special pages
 179                 'LinkSearch'                => 'LinkSearchPage',
 180                 'Randompage'                => 'Randompage',
 181                 'Randomredirect'            => 'SpecialRandomredirect',
 182
 183                 # High use pages
 184                 'Mostlinkedcategories'      => 'MostlinkedCategoriesPage',
 185                 'Mostimages'                => 'MostimagesPage',
 186                 'Mostlinked'                => 'MostlinkedPage',
 187                 'Mostlinkedtemplates'       => 'MostlinkedTemplatesPage',
 188                 'Mostcategories'            => 'MostcategoriesPage',
 189                 'Mostrevisions'             => 'MostrevisionsPage',
 190
 191                 # Page tools
 192                 'ComparePages'              => 'SpecialComparePages',
 193                 'Export'                    => 'SpecialExport',
 194                 'Import'                    => 'SpecialImport',
 195                 'Undelete'                  => 'SpecialUndelete',
 196                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 197                 'MergeHistory'              => 'SpecialMergeHistory',
 198
 199                 # Other
 200                 'Booksources'               => 'SpecialBookSources',
 201
 202                 # Unlisted / redirects
 203                 'Blankpage'                 => 'SpecialBlankpage',
 204                 'Blockme'                   => 'SpecialBlockme',
 205                 'Emailuser'                 => 'SpecialEmailUser',
 206                 'Movepage'                  => 'MovePageForm',
 207                 'Mycontributions'           => 'SpecialMycontributions',
 208                 'Mypage'                    => 'SpecialMypage',
 209                 'Mytalk'                    => 'SpecialMytalk',
 210                 'Myuploads'                 => 'SpecialMyuploads',
 211                 'PermanentLink'             => 'SpecialPermanentLink',
 212                 'Revisiondelete'            => 'SpecialRevisionDelete',
 213                 'RevisionMove'              => 'SpecialRevisionMove',
 214                 'Specialpages'              => 'SpecialSpecialpages',
 215                 'Userlogout'                => 'SpecialUserlogout',
 216         );
 217
 218         static public $mAliases;
 219         static public $mListInitialised = false;
 220
 221         /**#@-*/
 222
 223         /**
 224          * Initialise the special page list
 225          * This must be called before accessing SpecialPage::$mList
 226          */
 227         static function initList() {
 228                 global $wgSpecialPages;
 229                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 230
 231                 if ( self::$mListInitialised ) {
 232                         return;
 233                 }
 234                 wfProfileIn( __METHOD__ );
 235
 236                 # Better to set this now, to avoid infinite recursion in carelessly written hooks
 237                 self::$mListInitialised = true;
 238
 239                 if( !$wgDisableCounters ) {
 240                         self::$mList['Popularpages'] = 'PopularpagesPage';
 241                 }
 242
 243                 if( !$wgDisableInternalSearch ) {
 244                         self::$mList['Search'] = 'SpecialSearch';
 245                 }
 246
 247                 if( $wgEmailAuthentication ) {
 248                         self::$mList['Confirmemail'] = 'EmailConfirmation';
 249                         self::$mList['Invalidateemail'] = 'EmailInvalidation';
 250                 }
 251
 252                 # Add extension special pages
 253                 self::$mList = array_merge( self::$mList, $wgSpecialPages );
 254
 255                 # Run hooks
 256                 # This hook can be used to remove undesired built-in special pages
 257                 wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 258                 wfProfileOut( __METHOD__ );
 259         }
 260
 261         static function initAliasList() {
 262                 if ( !is_null( self::$mAliases ) ) {
 263                         return;
 264                 }
 265
 266                 global $wgContLang;
 267                 $aliases = $wgContLang->getSpecialPageAliases();
 268                 $missingPages = self::$mList;
 269                 self::$mAliases = array();
 270                 foreach ( $aliases as $realName => $aliasList ) {
 271                         foreach ( $aliasList as $alias ) {
 272                                 self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 273                         }
 274                         unset( $missingPages[$realName] );
 275                 }
 276                 foreach ( $missingPages as $name => $stuff ) {
 277                         self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 278                 }
 279         }
 280
 281         /**
 282          * Given a special page alias, return the special page name.
 283          * Returns false if there is no such alias.
 284          *
 285          * @param $alias String
 286          * @return String or false
 287          */
 288         static function resolveAlias( $alias ) {
 289                 global $wgContLang;
 290
 291                 if ( !self::$mListInitialised ) self::initList();
 292                 if ( is_null( self::$mAliases ) ) self::initAliasList();
 293                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 294                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 295                 if ( isset( self::$mAliases[$caseFoldedAlias] ) ) {
 296                         return self::$mAliases[$caseFoldedAlias];
 297                 } else {
 298                         return false;
 299                 }
 300         }
 301
 302         /**
 303          * Given a special page name with a possible subpage, return an array
 304          * where the first element is the special page name and the second is the
 305          * subpage.
 306          *
 307          * @param $alias String
 308          * @return Array
 309          */
 310         static function resolveAliasWithSubpage( $alias ) {
 311                 $bits = explode( '/', $alias, 2 );
 312                 $name = self::resolveAlias( $bits[0] );
 313                 if( !isset( $bits[1] ) ) { // bug 2087
 314                         $par = null;
 315                 } else {
 316                         $par = $bits[1];
 317                 }
 318                 return array( $name, $par );
 319         }
 320
 321         /**
 322          * Add a page to the list of valid special pages. This used to be the preferred
 323          * method for adding special pages in extensions. It's now suggested that you add
 324          * an associative record to $wgSpecialPages. This avoids autoloading SpecialPage.
 325          *
 326          * @param $page SpecialPage
 327          * Deprecated in 1.7, warnings in 1.17, might be removed in 1.20
 328          */
 329         static function addPage( &$page ) {
 330                 wfDeprecated( __METHOD__ );
 331                 if ( !self::$mListInitialised ) {
 332                         self::initList();
 333                 }
 334                 self::$mList[$page->mName] = $page;
 335         }
 336
 337         /**
 338          * Add a page to a certain display group for Special:SpecialPages
 339          *
 340          * @param $page Mixed: SpecialPage or string
 341          * @param $group String
 342          */
 343         static function setGroup( $page, $group ) {
 344                 global $wgSpecialPageGroups;
 345                 $name = is_object($page) ? $page->mName : $page;
 346                 $wgSpecialPageGroups[$name] = $group;
 347         }
 348
 349         /**
 350          * Add a page to a certain display group for Special:SpecialPages
 351          *
 352          * @param $page SpecialPage
 353          */
 354         static function getGroup( &$page ) {
 355                 global $wgSpecialPageGroups;
 356                 static $specialPageGroupsCache = array();
 357                 if( isset($specialPageGroupsCache[$page->mName]) ) {
 358                         return $specialPageGroupsCache[$page->mName];
 359                 }
 360                 $msg = wfMessage('specialpages-specialpagegroup-'.strtolower($page->mName));
 361                 if ( !$msg->isBlank() ) {
 362                         $group = $msg->text();
 363                 } else {
 364                         $group = isset($wgSpecialPageGroups[$page->mName])
 365                                 ? $wgSpecialPageGroups[$page->mName]
 366                                 : '-';
 367                 }
 368                 if( $group == '-' ) $group = 'other';
 369                 $specialPageGroupsCache[$page->mName] = $group;
 370                 return $group;
 371         }
 372
 373         /**
 374          * Remove a special page from the list
 375          * Formerly used to disable expensive or dangerous special pages. The
 376          * preferred method is now to add a SpecialPage_initList hook.
 377          */
 378         static function removePage( $name ) {
 379                 if ( !self::$mListInitialised ) {
 380                         self::initList();
 381                 }
 382                 unset( self::$mList[$name] );
 383         }
 384
 385         /**
 386          * Check if a given name exist as a special page or as a special page alias
 387          *
 388          * @param $name String: name of a special page
 389          * @return Boolean: true if a special page exists with this name
 390          */
 391         static function exists( $name ) {
 392                 global $wgContLang;
 393                 if ( !self::$mListInitialised ) {
 394                         self::initList();
 395                 }
 396                 if( !self::$mAliases ) {
 397                         self::initAliasList();
 398                 }
 399
 400                 # Remove special pages inline parameters:
 401                 $bits = explode( '/', $name );
 402                 $name = $wgContLang->caseFold($bits[0]);
 403
 404                 return
 405                         array_key_exists( $name, self::$mList )
 406                         or array_key_exists( $name, self::$mAliases )
 407                 ;
 408         }
 409
 410         /**
 411          * Find the object with a given name and return it (or NULL)
 412          *
 413          * @param $name String
 414          * @return SpecialPage object or null if the page doesn't exist
 415          */
 416         static function getPage( $name ) {
 417                 if ( !self::$mListInitialised ) {
 418                         self::initList();
 419                 }
 420                 if ( array_key_exists( $name, self::$mList ) ) {
 421                         $rec = self::$mList[$name];
 422                         if ( is_string( $rec ) ) {
 423                                 $className = $rec;
 424                                 self::$mList[$name] = new $className;
 425                         } elseif ( is_array( $rec ) ) {
 426                                 $className = array_shift( $rec );
 427                                 self::$mList[$name] = MWFunction::newObj( $className, $rec );
 428                         }
 429                         return self::$mList[$name];
 430                 } else {
 431                         return null;
 432                 }
 433         }
 434
 435         /**
 436          * Get a special page with a given localised name, or NULL if there
 437          * is no such special page.
 438          *
 439          * @return SpecialPage object or null if the page doesn't exist
 440          */
 441         static function getPageByAlias( $alias ) {
 442                 $realName = self::resolveAlias( $alias );
 443                 if ( $realName ) {
 444                         return self::getPage( $realName );
 445                 } else {
 446                         return null;
 447                 }
 448         }
 449
 450         /**
 451          * Return categorised listable special pages which are available
 452          * for the current user, and everyone.
 453          *
 454          * @return Associative array mapping page's name to its SpecialPage object
 455          */
 456         static function getUsablePages() {
 457                 global $wgUser;
 458                 if ( !self::$mListInitialised ) {
 459                         self::initList();
 460                 }
 461                 $pages = array();
 462
 463                 foreach ( self::$mList as $name => $rec ) {
 464                         $page = self::getPage( $name );
 465                         if ( $page->isListed()
 466                                 && (
 467                                         !$page->isRestricted()
 468                                         || $page->userCanExecute( $wgUser )
 469                                 )
 470                         ) {
 471                                 $pages[$name] = $page;
 472                         }
 473                 }
 474                 return $pages;
 475         }
 476
 477         /**
 478          * Return categorised listable special pages for all users
 479          *
 480          * @return Associative array mapping page's name to its SpecialPage object
 481          */
 482         static function getRegularPages() {
 483                 if ( !self::$mListInitialised ) {
 484                         self::initList();
 485                 }
 486                 $pages = array();
 487
 488                 foreach ( self::$mList as $name => $rec ) {
 489                         $page = self::getPage( $name );
 490                         if ( $page->isListed() && !$page->isRestricted() ) {
 491                                 $pages[$name] = $page;
 492                         }
 493                 }
 494                 return $pages;
 495         }
 496
 497         /**
 498          * Return categorised listable special pages which are available
 499          * for the current user, but not for everyone
 500          *
 501          * @return Associative array mapping page's name to its SpecialPage object
 502          */
 503         static function getRestrictedPages() {
 504                 global $wgUser;
 505                 if( !self::$mListInitialised ) {
 506                         self::initList();
 507                 }
 508                 $pages = array();
 509
 510                 foreach( self::$mList as $name => $rec ) {
 511                         $page = self::getPage( $name );
 512                         if(
 513                                 $page->isListed()
 514                                 && $page->isRestricted()
 515                                 && $page->userCanExecute( $wgUser )
 516                         ) {
 517                                 $pages[$name] = $page;
 518                         }
 519                 }
 520                 return $pages;
 521         }
 522
 523         /**
 524          * Execute a special page path.
 525          * The path may contain parameters, e.g. Special:Name/Params
 526          * Extracts the special page name and call the execute method, passing the parameters
 527          *
 528          * Returns a title object if the page is redirected, false if there was no such special
 529          * page, and true if it was successful.
 530          *
 531          * @param $title          a title object
 532          * @param $including      output is being captured for use in {{special:whatever}}
 533          */
 534         static function executePath( &$title, $including = false ) {
 535                 global $wgOut, $wgTitle, $wgRequest;
 536                 wfProfileIn( __METHOD__ );
 537
 538                 # FIXME: redirects broken due to this call
 539                 $bits = explode( '/', $title->getDBkey(), 2 );
 540                 $name = $bits[0];
 541                 if( !isset( $bits[1] ) ) { // bug 2087
 542                         $par = null;
 543                 } else {
 544                         $par = $bits[1];
 545                 }
 546                 $page = SpecialPage::getPageByAlias( $name );
 547                 # Nonexistent?
 548                 if ( !$page ) {
 549                         if ( !$including ) {
 550                                 $wgOut->setArticleRelated( false );
 551                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 552                                 $wgOut->setStatusCode( 404 );
 553                                 $wgOut->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 554                         }
 555                         wfProfileOut( __METHOD__ );
 556                         return false;
 557                 }
 558
 559                 # Page exists, set the context
 560                 $page->setContext( $wgRequest, $wgOut );
 561
 562                 # Check for redirect
 563                 if ( !$including ) {
 564                         $redirect = $page->getRedirect( $par );
 565                         $query = $page->getRedirectQuery();
 566                         if ( $redirect instanceof Title ) {
 567                                 $url = $redirect->getFullUrl( $query );
 568                                 $wgOut->redirect( $url );
 569                                 wfProfileOut( __METHOD__ );
 570                                 return $redirect;
 571                         } elseif( $redirect === true ) {
 572                                 global $wgScript;
 573                                 $url = $wgScript . '?' . wfArrayToCGI( $query );
 574                                 $wgOut->redirect( $url );
 575                                 wfProfileOut( __METHOD__ );
 576                                 return $redirect;
 577                         }
 578                 }
 579
 580                 # Redirect to canonical alias for GET commands
 581                 # Not for POST, we'd lose the post data, so it's best to just distribute
 582                 # the request. Such POST requests are possible for old extensions that
 583                 # generate self-links without being aware that their default name has
 584                 # changed.
 585                 if ( !$including && $name != $page->getLocalName() && !$wgRequest->wasPosted() ) {
 586                         $query = $_GET;
 587                         unset( $query['title'] );
 588                         $query = wfArrayToCGI( $query );
 589                         $title = $page->getTitle( $par );
 590                         $url = $title->getFullUrl( $query );
 591                         $wgOut->redirect( $url );
 592                         wfProfileOut( __METHOD__ );
 593                         return $redirect;
 594                 }
 595
 596                 if ( $including && !$page->includable() ) {
 597                         wfProfileOut( __METHOD__ );
 598                         return false;
 599                 } elseif ( !$including ) {
 600                         $wgTitle = $page->getTitle();
 601                 }
 602                 $page->including( $including );
 603
 604                 // Execute special page
 605                 $profName = 'Special:' . $page->name();
 606                 wfProfileIn( $profName );
 607                 $page->execute( $par );
 608                 wfProfileOut( $profName );
 609                 wfProfileOut( __METHOD__ );
 610                 return true;
 611         }
 612
 613         /**
 614          * Just like executePath() except it returns the HTML instead of outputting it
 615          * Returns false if there was no such special page, or a title object if it was
 616          * a redirect.
 617          *
 618          * @return String: HTML fragment
 619          */
 620         static function capturePath( &$title ) {
 621                 global $wgOut, $wgTitle;
 622
 623                 $oldTitle = $wgTitle;
 624                 $oldOut = $wgOut;
 625                 $wgOut = new OutputPage;
 626                 $wgOut->setTitle( $title );
 627
 628                 $ret = SpecialPage::executePath( $title, true );
 629                 if ( $ret === true ) {
 630                         $ret = $wgOut->getHTML();
 631                 }
 632                 $wgTitle = $oldTitle;
 633                 $wgOut = $oldOut;
 634                 return $ret;
 635         }
 636
 637         /**
 638          * Get the local name for a specified canonical name
 639          *
 640          * @param $name String
 641          * @param $subpage Mixed: boolean false, or string
 642          *
 643          * @return String
 644          */
 645         static function getLocalNameFor( $name, $subpage = false ) {
 646                 global $wgContLang;
 647                 $aliases = $wgContLang->getSpecialPageAliases();
 648                 if ( isset( $aliases[$name][0] ) ) {
 649                         $name = $aliases[$name][0];
 650                 } else {
 651                         // Try harder in case someone misspelled the correct casing
 652                         $found = false;
 653                         foreach ( $aliases as $n => $values ) {
 654                                 if ( strcasecmp( $name, $n ) === 0 ) {
 655                                         wfWarn( "Found alias defined for $n when searching for " .
 656                                                 "special page aliases for $name. Case mismatch?" );
 657                                         $name = $values[0];
 658                                         $found = true;
 659                                         break;
 660                                 }
 661                         }
 662                         if ( !$found ) {
 663                                 wfWarn( "Did not find alias for special page '$name'. " .
 664                                         "Perhaps no aliases are defined for it?" );
 665                         }
 666                 }
 667                 if ( $subpage !== false && !is_null( $subpage ) ) {
 668                         $name = "$name/$subpage";
 669                 }
 670                 return $wgContLang->ucfirst( $name );
 671         }
 672
 673         /**
 674          * Get a localised Title object for a specified special page name
 675          *
 676          * @return Title object
 677          */
 678         static function getTitleFor( $name, $subpage = false ) {
 679                 $name = self::getLocalNameFor( $name, $subpage );
 680                 if ( $name ) {
 681                         return Title::makeTitle( NS_SPECIAL, $name );
 682                 } else {
 683                         throw new MWException( "Invalid special page name \"$name\"" );
 684                 }
 685         }
 686
 687         /**
 688          * Get a localised Title object for a page name with a possibly unvalidated subpage
 689          *
 690          * @return Title object or null if the page doesn't exist
 691          */
 692         static function getSafeTitleFor( $name, $subpage = false ) {
 693                 $name = self::getLocalNameFor( $name, $subpage );
 694                 if ( $name ) {
 695                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 696                 } else {
 697                         return null;
 698                 }
 699         }
 700
 701         /**
 702          * Get a title for a given alias
 703          *
 704          * @return Title or null if there is no such alias
 705          */
 706         static function getTitleForAlias( $alias ) {
 707                 $name = self::resolveAlias( $alias );
 708                 if ( $name ) {
 709                         return self::getTitleFor( $name );
 710                 } else {
 711                         return null;
 712                 }
 713         }
 714
 715         /**
 716          * Default constructor for special pages
 717          * Derivative classes should call this from their constructor
 718          *     Note that if the user does not have the required level, an error message will
 719          *     be displayed by the default execute() method, without the global function ever
 720          *     being called.
 721          *
 722          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 723          *     and displayRestrictionError()
 724          *
 725          * @param $name String: name of the special page, as seen in links and URLs
 726          * @param $restriction String: user right required, e.g. "block" or "delete"
 727          * @param $listed Boolean: whether the page is listed in Special:Specialpages
 728          * @param $function Callback: function called by execute(). By default it is constructed from $name
 729          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 730          * @param $includable Boolean: whether the page can be included in normal pages
 731          */
 732         public function __construct( $name = '', $restriction = '', $listed = true, $function = false, $file = 'default', $includable = false ) {
 733                 $this->init( $name, $restriction, $listed, $function, $file, $includable );
 734         }
 735
 736         /**
 737          * Do the real work for the constructor, mainly so __call() can intercept
 738          * calls to SpecialPage()
 739          * @see __construct() for param docs
 740          */
 741         private function init( $name, $restriction, $listed, $function, $file, $includable ) {
 742                 $this->mName = $name;
 743                 $this->mRestriction = $restriction;
 744                 $this->mListed = $listed;
 745                 $this->mIncludable = $includable;
 746                 if ( !$function ) {
 747                         $this->mFunction = 'wfSpecial'.$name;
 748                 } else {
 749                         $this->mFunction = $function;
 750                 }
 751                 if ( $file === 'default' ) {
 752                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 753                 } else {
 754                         $this->mFile = $file;
 755                 }
 756         }
 757
 758         /**
 759          * Use PHP's magic __call handler to get calls to the old PHP4 constructor
 760          * because PHP E_STRICT yells at you for having __construct() and SpecialPage()
 761          *
 762          * @param $fName String Name of called method
 763          * @param $a Array Arguments to the method
 764          * @deprecated Call isn't deprecated, but SpecialPage::SpecialPage() is
 765          */
 766         public function __call( $fName, $a ) {
 767                 // Sometimes $fName is SpecialPage, sometimes it's specialpage. <3 PHP
 768                 if( strtolower( $fName ) == 'specialpage' ) {
 769                         // Debug messages now, warnings in 1.19 or 1.20?
 770                         wfDebug( "Deprecated SpecialPage::SpecialPage() called, use __construct();\n" );
 771                         $name = isset( $a[0] ) ? $a[0] : '';
 772                         $restriction = isset( $a[1] ) ? $a[1] : '';
 773                         $listed = isset( $a[2] ) ? $a[2] : true;
 774                         $function = isset( $a[3] ) ? $a[3] : false;
 775                         $file = isset( $a[4] ) ? $a[4] : 'default';
 776                         $includable = isset( $a[5] ) ? $a[5] : false;
 777                         $this->init( $name, $restriction, $listed, $function, $file, $includable );
 778                 } else {
 779                         $className = get_class( $this );
 780                         throw new MWException( "Call to undefined method $className::$fName" );
 781                 }
 782         }
 783
 784         /**#@+
 785           * Accessor
 786           *
 787           * @deprecated
 788           */
 789         function getName() { return $this->mName; }
 790         function getRestriction() { return $this->mRestriction; }
 791         function getFile() { return $this->mFile; }
 792         function isListed() { return $this->mListed; }
 793         /**#@-*/
 794
 795         /**#@+
 796           * Accessor and mutator
 797           */
 798         function name( $x = null ) { return wfSetVar( $this->mName, $x ); }
 799         function restrictions( $x = null) {
 800                 # Use the one below this
 801                 wfDeprecated( __METHOD__ );
 802                 return wfSetVar( $this->mRestriction, $x );
 803         }
 804         function restriction( $x = null) { return wfSetVar( $this->mRestriction, $x ); }
 805         function listed( $x = null) { return wfSetVar( $this->mListed, $x ); }
 806         function func( $x = null) { return wfSetVar( $this->mFunction, $x ); }
 807         function file( $x = null) { return wfSetVar( $this->mFile, $x ); }
 808         function includable( $x = null ) { return wfSetVar( $this->mIncludable, $x ); }
 809         function including( $x = null ) { return wfSetVar( $this->mIncluding, $x ); }
 810         /**#@-*/
 811
 812         /**
 813          * Get the localised name of the special page
 814          */
 815         function getLocalName() {
 816                 if ( !isset( $this->mLocalName ) ) {
 817                         $this->mLocalName = self::getLocalNameFor( $this->mName );
 818                 }
 819                 return $this->mLocalName;
 820         }
 821
 822         /**
 823          * Can be overridden by subclasses with more complicated permissions
 824          * schemes.
 825          *
 826          * @return Boolean: should the page be displayed with the restricted-access
 827          *   pages?
 828          */
 829         public function isRestricted() {
 830                 global $wgGroupPermissions;
 831                 // DWIM: If all anons can do something, then it is not restricted
 832                 return $this->mRestriction != '' && empty($wgGroupPermissions['*'][$this->mRestriction]);
 833         }
 834
 835         /**
 836          * Checks if the given user (identified by an object) can execute this
 837          * special page (as defined by $mRestriction).  Can be overridden by sub-
 838          * classes with more complicated permissions schemes.
 839          *
 840          * @param $user User: the user to check
 841          * @return Boolean: does the user have permission to view the page?
 842          */
 843         public function userCanExecute( $user ) {
 844                 return $user->isAllowed( $this->mRestriction );
 845         }
 846
 847         /**
 848          * Output an error message telling the user what access level they have to have
 849          */
 850         function displayRestrictionError() {
 851                 global $wgOut;
 852                 $wgOut->permissionRequired( $this->mRestriction );
 853         }
 854
 855         /**
 856          * Sets headers - this should be called from the execute() method of all derived classes!
 857          */
 858         function setHeaders() {
 859                 global $wgOut;
 860                 $wgOut->setArticleRelated( false );
 861                 $wgOut->setRobotPolicy( "noindex,nofollow" );
 862                 $wgOut->setPageTitle( $this->getDescription() );
 863         }
 864
 865         /**
 866          * Default execute method
 867          * Checks user permissions, calls the function given in mFunction
 868          *
 869          * This may be overridden by subclasses.
 870          */
 871         function execute( $par ) {
 872                 global $wgUser;
 873
 874                 $this->setHeaders();
 875
 876                 if ( $this->userCanExecute( $wgUser ) ) {
 877                         $func = $this->mFunction;
 878                         // only load file if the function does not exist
 879                         if(!is_callable($func) and $this->mFile) {
 880                                 require_once( $this->mFile );
 881                         }
 882                         $this->outputHeader();
 883                         call_user_func( $func, $par, $this );
 884                 } else {
 885                         $this->displayRestrictionError();
 886                 }
 887         }
 888
 889         /**
 890          * Outputs a summary message on top of special pages
 891          * Per default the message key is the canonical name of the special page
 892          * May be overriden, i.e. by extensions to stick with the naming conventions
 893          * for message keys: 'extensionname-xxx'
 894          *
 895          * @param $summaryMessageKey String: message key of the summary
 896          */
 897         function outputHeader( $summaryMessageKey = '' ) {
 898                 global $wgOut, $wgContLang;
 899
 900                 if( $summaryMessageKey == '' ) {
 901                         $msg = $wgContLang->lc( $this->name() ) . '-summary';
 902                 } else {
 903                         $msg = $summaryMessageKey;
 904                 }
 905                 if ( !wfMessage( $msg )->isBlank() and ! $this->including() ) {
 906                         $wgOut->wrapWikiMsg( "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 907                 }
 908
 909         }
 910
 911         /**
 912          * Returns the name that goes in the \<h1\> in the special page itself, and
 913          * also the name that will be listed in Special:Specialpages
 914          *
 915          * Derived classes can override this, but usually it is easier to keep the
 916          * default behaviour. Messages can be added at run-time, see
 917          * MessageCache.php.
 918          *
 919          * @return String
 920          */
 921         function getDescription() {
 922                 return wfMsg( strtolower( $this->mName ) );
 923         }
 924
 925         /**
 926          * Get a self-referential title object
 927          *
 928          * @return Title object
 929          */
 930         function getTitle( $subpage = false ) {
 931                 return self::getTitleFor( $this->mName, $subpage );
 932         }
 933
 934         /**
 935          * Set whether this page is listed in Special:Specialpages, at run-time
 936          */
 937         function setListed( $listed ) {
 938                 return wfSetVar( $this->mListed, $listed );
 939         }
 940
 941         /**
 942          * If the special page is a redirect, then get the Title object it redirects to.
 943          * False otherwise.
 944          */
 945         function getRedirect( $subpage ) {
 946                 return false;
 947         }
 948
 949         /**
 950          * Return part of the request string for a special redirect page
 951          * This allows passing, e.g. action=history to Special:Mypage, etc.
 952          *
 953          * @return String
 954          */
 955         function getRedirectQuery() {
 956                 global $wgRequest;
 957                 $params = array();
 958
 959                 foreach( $this->mAllowedRedirectParams as $arg ) {
 960                         if( $wgRequest->getVal( $arg, null ) !== null ){
 961                                 $params[$arg] = $wgRequest->getVal( $arg );
 962                         }
 963                 }
 964
 965                 foreach( $this->mAddedRedirectParams as $arg => $val ) {
 966                         $params[$arg] = $val;
 967                 }
 968
 969                 return count( $params )
 970                         ? $params
 971                         : false;
 972         }
 973
 974         /**
 975          * Sets the context this SpecialPage is executed in
 976          *
 977          * @param $request WebRequest
 978          * @param $output OutputPage
 979          */
 980         protected function setContext( $request, $output ) {
 981                 $this->mRequest = $request;
 982                 $this->mOutput = $output;
 983                 $this->mFullTitle = $output->getTitle();
 984         }
 985         /**
 986          * Wrapper around wfMessage that sets the current context. Currently this
 987          * is only the title.
 988          *
 989          * @see wfMessage
 990          */
 991         public function msg( /* $args */ ) {
 992                 return call_user_func_array( 'wfMessage', func_get_args() )->title( $this->mFullTitle );
 993         }
 994 }
 995
 996 /**
 997  * Shortcut to construct a special page which is unlisted by default
 998  * @ingroup SpecialPage
 999  */
1000 class UnlistedSpecialPage extends SpecialPage
1001 {
1002         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
1003                 parent::__construct( $name, $restriction, false, $function, $file );
1004         }
1005 }
1006
1007 /**
1008  * Shortcut to construct an includable special  page
1009  * @ingroup SpecialPage
1010  */
1011 class IncludableSpecialPage extends SpecialPage
1012 {
1013         function __construct( $name, $restriction = '', $listed = true, $function = false, $file = 'default' ) {
1014                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
1015         }
1016 }
1017
1018 /**
1019  * Shortcut to construct a special page alias.
1020  * @ingroup SpecialPage
1021  */
1022 class SpecialRedirectToSpecial extends UnlistedSpecialPage {
1023         var $redirName, $redirSubpage;
1024
1025         function __construct( $name, $redirName, $redirSubpage = false, $allowedRedirectParams = array(), $addedRedirectParams = array() ) {
1026                 parent::__construct( $name );
1027                 $this->redirName = $redirName;
1028                 $this->redirSubpage = $redirSubpage;
1029                 $this->mAllowedRedirectParams = $allowedRedirectParams;
1030                 $this->mAddedRedirectParams = $addedRedirectParams;
1031         }
1032
1033         function getRedirect( $subpage ) {
1034                 if ( $this->redirSubpage === false ) {
1035                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
1036                 } else {
1037                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
1038                 }
1039         }
1040 }
1041
1042 /**
1043  * SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
1044  * are used to get user independant links pointing to the user page, talk
1045  * page and list of contributions.
1046  * This can let us cache a single copy of any generated content for all
1047  * users.
1048  */
1049
1050 /**
1051  * Shortcut to construct a special page pointing to current user user's page.
1052  * @ingroup SpecialPage
1053  */
1054 class SpecialMypage extends UnlistedSpecialPage {
1055         function __construct() {
1056                 parent::__construct( 'Mypage' );
1057                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1058                         'section', 'oldid', 'diff', 'dir' );
1059         }
1060
1061         function getRedirect( $subpage ) {
1062                 global $wgUser;
1063                 if ( strval( $subpage ) !== '' ) {
1064                         return Title::makeTitle( NS_USER, $wgUser->getName() . '/' . $subpage );
1065                 } else {
1066                         return Title::makeTitle( NS_USER, $wgUser->getName() );
1067                 }
1068         }
1069 }
1070
1071 /**
1072  * Shortcut to construct a special page pointing to current user talk page.
1073  * @ingroup SpecialPage
1074  */
1075 class SpecialMytalk extends UnlistedSpecialPage {
1076         function __construct() {
1077                 parent::__construct( 'Mytalk' );
1078                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1079                         'section', 'oldid', 'diff', 'dir' );
1080         }
1081
1082         function getRedirect( $subpage ) {
1083                 global $wgUser;
1084                 if ( strval( $subpage ) !== '' ) {
1085                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() . '/' . $subpage );
1086                 } else {
1087                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() );
1088                 }
1089         }
1090 }
1091
1092 /**
1093  * Shortcut to construct a special page pointing to current user contributions.
1094  * @ingroup SpecialPage
1095  */
1096 class SpecialMycontributions extends UnlistedSpecialPage {
1097         function __construct() {
1098                 parent::__construct(  'Mycontributions' );
1099                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
1100                         'offset', 'dir', 'year', 'month', 'feed' );
1101         }
1102
1103         function getRedirect( $subpage ) {
1104                 global $wgUser;
1105                 return SpecialPage::getTitleFor( 'Contributions', $wgUser->getName() );
1106         }
1107 }
1108
1109 /**
1110  * Redirect to Special:Listfiles?user=$wgUser
1111  */
1112 class SpecialMyuploads extends UnlistedSpecialPage {
1113         function __construct() {
1114                 parent::__construct( 'Myuploads' );
1115                 $this->mAllowedRedirectParams = array( 'limit' );
1116         }
1117
1118         function getRedirect( $subpage ) {
1119                 global $wgUser;
1120                 return SpecialPage::getTitleFor( 'Listfiles', $wgUser->getName() );
1121         }
1122 }
1123
1124 /**
1125  * Redirect from Special:PermanentLink/### to index.php?oldid=###
1126  */
1127 class SpecialPermanentLink extends UnlistedSpecialPage {
1128         function __construct() {
1129                 parent::__construct( 'PermanentLink' );
1130                 $this->mAllowedRedirectParams = array();
1131         }
1132
1133         function getRedirect( $subpage ) {
1134                 $subpage = intval( $subpage );
1135                 $this->mAddedRedirectParams['oldid'] = $subpage;
1136                 return true;
1137         }
1138 }