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