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                 'Block'                     => 'SpecialBlock',
 140                 'Unblock'                   => 'SpecialUnblock',
 141                 'BlockList'                 => 'SpecialBlockList',
 142                 'Resetpass'                 => 'SpecialResetpass',
 143                 'DeletedContributions'      => 'DeletedContributionsPage',
 144                 'Preferences'               => 'SpecialPreferences',
 145                 'Contributions'             => 'SpecialContributions',
 146                 'Listgrouprights'           => 'SpecialListGroupRights',
 147                 'Listusers'                 => 'SpecialListusers',
 148                 'Listadmins'                => array( 'SpecialRedirectToSpecial', 'Listadmins', 'Listusers', 'sysop' ),
 149                 'Listbots'                  => array( 'SpecialRedirectToSpecial', 'Listbots', 'Listusers', 'bot' ),
 150                 'Activeusers'               => 'SpecialActiveUsers',
 151                 'Userrights'                => 'UserrightsPage',
 152                 'DisableAccount'            => 'SpecialDisableAccount',
 153                 'EditWatchlist'             => 'SpecialEditWatchlist',
 154
 155                 # Recent changes and logs
 156                 'Newimages'                 => 'SpecialNewFiles',
 157                 'Log'                       => 'SpecialLog',
 158                 'Watchlist'                 => 'SpecialWatchlist',
 159                 'Newpages'                  => 'SpecialNewpages',
 160                 'Recentchanges'             => 'SpecialRecentchanges',
 161                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 162                 'Tags'                      => 'SpecialTags',
 163
 164                 # Media reports and uploads
 165                 'Listfiles'                 => 'SpecialListFiles',
 166                 'Filepath'                  => 'SpecialFilepath',
 167                 'MIMEsearch'                => 'MIMEsearchPage',
 168                 'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
 169                 'Upload'                    => 'SpecialUpload',
 170                 'UploadStash'               => 'SpecialUploadStash',
 171
 172                 # Wiki data and tools
 173                 'Statistics'                => 'SpecialStatistics',
 174                 'Allmessages'               => 'SpecialAllmessages',
 175                 'Version'                   => 'SpecialVersion',
 176                 'Lockdb'                    => 'SpecialLockdb',
 177                 'Unlockdb'                  => 'SpecialUnlockdb',
 178
 179                 # Redirecting special pages
 180                 'LinkSearch'                => 'LinkSearchPage',
 181                 'Randompage'                => 'Randompage',
 182                 'Randomredirect'            => 'SpecialRandomredirect',
 183
 184                 # High use pages
 185                 'Mostlinkedcategories'      => 'MostlinkedCategoriesPage',
 186                 'Mostimages'                => 'MostimagesPage',
 187                 'Mostlinked'                => 'MostlinkedPage',
 188                 'Mostlinkedtemplates'       => 'MostlinkedTemplatesPage',
 189                 'Mostcategories'            => 'MostcategoriesPage',
 190                 'Mostrevisions'             => 'MostrevisionsPage',
 191
 192                 # Page tools
 193                 'ComparePages'              => 'SpecialComparePages',
 194                 'Export'                    => 'SpecialExport',
 195                 'Import'                    => 'SpecialImport',
 196                 'Undelete'                  => 'SpecialUndelete',
 197                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 198                 'MergeHistory'              => 'SpecialMergeHistory',
 199
 200                 # Other
 201                 'Booksources'               => 'SpecialBookSources',
 202
 203                 # Unlisted / redirects
 204                 'Blankpage'                 => 'SpecialBlankpage',
 205                 'Blockme'                   => 'SpecialBlockme',
 206                 'Emailuser'                 => 'SpecialEmailUser',
 207                 'Movepage'                  => 'MovePageForm',
 208                 'Mycontributions'           => 'SpecialMycontributions',
 209                 'Mypage'                    => 'SpecialMypage',
 210                 'Mytalk'                    => 'SpecialMytalk',
 211                 'Myuploads'                 => 'SpecialMyuploads',
 212                 'PermanentLink'             => 'SpecialPermanentLink',
 213                 'Revisiondelete'            => 'SpecialRevisionDelete',
 214                 'RevisionMove'              => 'SpecialRevisionMove',
 215                 'Specialpages'              => 'SpecialSpecialpages',
 216                 'Userlogout'                => 'SpecialUserlogout',
 217         );
 218
 219         static public $mAliases;
 220         static public $mListInitialised = false;
 221
 222         /**#@-*/
 223
 224         /**
 225          * Initialise the special page list
 226          * This must be called before accessing SpecialPage::$mList
 227          */
 228         static function initList() {
 229                 global $wgSpecialPages;
 230                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 231
 232                 if ( self::$mListInitialised ) {
 233                         return;
 234                 }
 235                 wfProfileIn( __METHOD__ );
 236
 237                 # Better to set this now, to avoid infinite recursion in carelessly written hooks
 238                 self::$mListInitialised = true;
 239
 240                 if( !$wgDisableCounters ) {
 241                         self::$mList['Popularpages'] = 'PopularpagesPage';
 242                 }
 243
 244                 if( !$wgDisableInternalSearch ) {
 245                         self::$mList['Search'] = 'SpecialSearch';
 246                 }
 247
 248                 if( $wgEmailAuthentication ) {
 249                         self::$mList['Confirmemail'] = 'EmailConfirmation';
 250                         self::$mList['Invalidateemail'] = 'EmailInvalidation';
 251                 }
 252
 253                 # Add extension special pages
 254                 self::$mList = array_merge( self::$mList, $wgSpecialPages );
 255
 256                 # Run hooks
 257                 # This hook can be used to remove undesired built-in special pages
 258                 wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 259                 wfProfileOut( __METHOD__ );
 260         }
 261
 262         static function initAliasList() {
 263                 if ( !is_null( self::$mAliases ) ) {
 264                         return;
 265                 }
 266
 267                 global $wgContLang;
 268                 $aliases = $wgContLang->getSpecialPageAliases();
 269                 $missingPages = self::$mList;
 270                 self::$mAliases = array();
 271                 foreach ( $aliases as $realName => $aliasList ) {
 272                         foreach ( $aliasList as $alias ) {
 273                                 self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 274                         }
 275                         unset( $missingPages[$realName] );
 276                 }
 277                 foreach ( $missingPages as $name => $stuff ) {
 278                         self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 279                 }
 280         }
 281
 282         /**
 283          * Given a special page alias, return the special page name.
 284          * Returns false if there is no such alias.
 285          *
 286          * @param $alias String
 287          * @return String or false
 288          */
 289         static function resolveAlias( $alias ) {
 290                 global $wgContLang;
 291
 292                 if ( !self::$mListInitialised ) self::initList();
 293                 if ( is_null( self::$mAliases ) ) self::initAliasList();
 294                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 295                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 296                 if ( isset( self::$mAliases[$caseFoldedAlias] ) ) {
 297                         return self::$mAliases[$caseFoldedAlias];
 298                 } else {
 299                         return false;
 300                 }
 301         }
 302
 303         /**
 304          * Given a special page name with a possible subpage, return an array
 305          * where the first element is the special page name and the second is the
 306          * subpage.
 307          *
 308          * @param $alias String
 309          * @return Array
 310          */
 311         static function resolveAliasWithSubpage( $alias ) {
 312                 $bits = explode( '/', $alias, 2 );
 313                 $name = self::resolveAlias( $bits[0] );
 314                 if( !isset( $bits[1] ) ) { // bug 2087
 315                         $par = null;
 316                 } else {
 317                         $par = $bits[1];
 318                 }
 319                 return array( $name, $par );
 320         }
 321
 322         /**
 323          * Add a page to the list of valid special pages. This used to be the preferred
 324          * method for adding special pages in extensions. It's now suggested that you add
 325          * an associative record to $wgSpecialPages. This avoids autoloading SpecialPage.
 326          *
 327          * @param $page SpecialPage
 328          * Deprecated in 1.7, warnings in 1.17, might be removed in 1.20
 329          */
 330         static function addPage( &$page ) {
 331                 wfDeprecated( __METHOD__ );
 332                 if ( !self::$mListInitialised ) {
 333                         self::initList();
 334                 }
 335                 self::$mList[$page->mName] = $page;
 336         }
 337
 338         /**
 339          * Add a page to a certain display group for Special:SpecialPages
 340          *
 341          * @param $page Mixed: SpecialPage or string
 342          * @param $group String
 343          */
 344         static function setGroup( $page, $group ) {
 345                 global $wgSpecialPageGroups;
 346                 $name = is_object($page) ? $page->mName : $page;
 347                 $wgSpecialPageGroups[$name] = $group;
 348         }
 349
 350         /**
 351          * Add a page to a certain display group for Special:SpecialPages
 352          *
 353          * @param $page SpecialPage
 354          */
 355         static function getGroup( &$page ) {
 356                 global $wgSpecialPageGroups;
 357                 static $specialPageGroupsCache = array();
 358                 if( isset($specialPageGroupsCache[$page->mName]) ) {
 359                         return $specialPageGroupsCache[$page->mName];
 360                 }
 361                 $msg = wfMessage('specialpages-specialpagegroup-'.strtolower($page->mName));
 362                 if ( !$msg->isBlank() ) {
 363                         $group = $msg->text();
 364                 } else {
 365                         $group = isset($wgSpecialPageGroups[$page->mName])
 366                                 ? $wgSpecialPageGroups[$page->mName]
 367                                 : '-';
 368                 }
 369                 if( $group == '-' ) $group = 'other';
 370                 $specialPageGroupsCache[$page->mName] = $group;
 371                 return $group;
 372         }
 373
 374         /**
 375          * Remove a special page from the list
 376          * Formerly used to disable expensive or dangerous special pages. The
 377          * preferred method is now to add a SpecialPage_initList hook.
 378          */
 379         static function removePage( $name ) {
 380                 if ( !self::$mListInitialised ) {
 381                         self::initList();
 382                 }
 383                 unset( self::$mList[$name] );
 384         }
 385
 386         /**
 387          * Check if a given name exist as a special page or as a special page alias
 388          *
 389          * @param $name String: name of a special page
 390          * @return Boolean: true if a special page exists with this name
 391          */
 392         static function exists( $name ) {
 393                 global $wgContLang;
 394                 if ( !self::$mListInitialised ) {
 395                         self::initList();
 396                 }
 397                 if( !self::$mAliases ) {
 398                         self::initAliasList();
 399                 }
 400
 401                 # Remove special pages inline parameters:
 402                 $bits = explode( '/', $name );
 403                 $name = $wgContLang->caseFold($bits[0]);
 404
 405                 return
 406                         array_key_exists( $name, self::$mList )
 407                         or array_key_exists( $name, self::$mAliases )
 408                 ;
 409         }
 410
 411         /**
 412          * Find the object with a given name and return it (or NULL)
 413          *
 414          * @param $name String
 415          * @return SpecialPage object or null if the page doesn't exist
 416          */
 417         static function getPage( $name ) {
 418                 if ( !self::$mListInitialised ) {
 419                         self::initList();
 420                 }
 421                 if ( array_key_exists( $name, self::$mList ) ) {
 422                         $rec = self::$mList[$name];
 423                         if ( is_string( $rec ) ) {
 424                                 $className = $rec;
 425                                 self::$mList[$name] = new $className;
 426                         } elseif ( is_array( $rec ) ) {
 427                                 $className = array_shift( $rec );
 428                                 self::$mList[$name] = MWFunction::newObj( $className, $rec );
 429                         }
 430                         return self::$mList[$name];
 431                 } else {
 432                         return null;
 433                 }
 434         }
 435
 436         /**
 437          * Get a special page with a given localised name, or NULL if there
 438          * is no such special page.
 439          *
 440          * @return SpecialPage object or null if the page doesn't exist
 441          */
 442         static function getPageByAlias( $alias ) {
 443                 $realName = self::resolveAlias( $alias );
 444                 if ( $realName ) {
 445                         return self::getPage( $realName );
 446                 } else {
 447                         return null;
 448                 }
 449         }
 450
 451         /**
 452          * Return categorised listable special pages which are available
 453          * for the current user, and everyone.
 454          *
 455          * @return Associative array mapping page's name to its SpecialPage object
 456          */
 457         static function getUsablePages() {
 458                 global $wgUser;
 459                 if ( !self::$mListInitialised ) {
 460                         self::initList();
 461                 }
 462                 $pages = array();
 463
 464                 foreach ( self::$mList as $name => $rec ) {
 465                         $page = self::getPage( $name );
 466                         if ( $page->isListed()
 467                                 && (
 468                                         !$page->isRestricted()
 469                                         || $page->userCanExecute( $wgUser )
 470                                 )
 471                         ) {
 472                                 $pages[$name] = $page;
 473                         }
 474                 }
 475                 return $pages;
 476         }
 477
 478         /**
 479          * Return categorised listable special pages for all users
 480          *
 481          * @return Associative array mapping page's name to its SpecialPage object
 482          */
 483         static function getRegularPages() {
 484                 if ( !self::$mListInitialised ) {
 485                         self::initList();
 486                 }
 487                 $pages = array();
 488
 489                 foreach ( self::$mList as $name => $rec ) {
 490                         $page = self::getPage( $name );
 491                         if ( $page->isListed() && !$page->isRestricted() ) {
 492                                 $pages[$name] = $page;
 493                         }
 494                 }
 495                 return $pages;
 496         }
 497
 498         /**
 499          * Return categorised listable special pages which are available
 500          * for the current user, but not for everyone
 501          *
 502          * @return Associative array mapping page's name to its SpecialPage object
 503          */
 504         static function getRestrictedPages() {
 505                 global $wgUser;
 506                 if( !self::$mListInitialised ) {
 507                         self::initList();
 508                 }
 509                 $pages = array();
 510
 511                 foreach( self::$mList as $name => $rec ) {
 512                         $page = self::getPage( $name );
 513                         if(
 514                                 $page->isListed()
 515                                 && $page->isRestricted()
 516                                 && $page->userCanExecute( $wgUser )
 517                         ) {
 518                                 $pages[$name] = $page;
 519                         }
 520                 }
 521                 return $pages;
 522         }
 523
 524         /**
 525          * Execute a special page path.
 526          * The path may contain parameters, e.g. Special:Name/Params
 527          * Extracts the special page name and call the execute method, passing the parameters
 528          *
 529          * Returns a title object if the page is redirected, false if there was no such special
 530          * page, and true if it was successful.
 531          *
 532          * @param $title          a title object
 533          * @param $including      output is being captured for use in {{special:whatever}}
 534          */
 535         static function executePath( &$title, $including = false ) {
 536                 global $wgOut, $wgTitle, $wgRequest;
 537                 wfProfileIn( __METHOD__ );
 538
 539                 # FIXME: redirects broken due to this call
 540                 $bits = explode( '/', $title->getDBkey(), 2 );
 541                 $name = $bits[0];
 542                 if( !isset( $bits[1] ) ) { // bug 2087
 543                         $par = null;
 544                 } else {
 545                         $par = $bits[1];
 546                 }
 547                 $page = SpecialPage::getPageByAlias( $name );
 548                 # Nonexistent?
 549                 if ( !$page ) {
 550                         if ( !$including ) {
 551                                 $wgOut->setArticleRelated( false );
 552                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 553                                 $wgOut->setStatusCode( 404 );
 554                                 $wgOut->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 555                         }
 556                         wfProfileOut( __METHOD__ );
 557                         return false;
 558                 }
 559
 560                 # Page exists, set the context
 561                 $page->setContext( $wgRequest, $wgOut );
 562
 563                 # Check for redirect
 564                 if ( !$including ) {
 565                         $redirect = $page->getRedirect( $par );
 566                         $query = $page->getRedirectQuery();
 567                         if ( $redirect instanceof Title ) {
 568                                 $url = $redirect->getFullUrl( $query );
 569                                 $wgOut->redirect( $url );
 570                                 wfProfileOut( __METHOD__ );
 571                                 return $redirect;
 572                         } elseif( $redirect === true ) {
 573                                 global $wgScript;
 574                                 $url = $wgScript . '?' . wfArrayToCGI( $query );
 575                                 $wgOut->redirect( $url );
 576                                 wfProfileOut( __METHOD__ );
 577                                 return $redirect;
 578                         }
 579                 }
 580
 581                 # Redirect to canonical alias for GET commands
 582                 # Not for POST, we'd lose the post data, so it's best to just distribute
 583                 # the request. Such POST requests are possible for old extensions that
 584                 # generate self-links without being aware that their default name has
 585                 # changed.
 586                 if ( !$including && $name != $page->getLocalName() && !$wgRequest->wasPosted() ) {
 587                         $query = $_GET;
 588                         unset( $query['title'] );
 589                         $query = wfArrayToCGI( $query );
 590                         $title = $page->getTitle( $par );
 591                         $url = $title->getFullUrl( $query );
 592                         $wgOut->redirect( $url );
 593                         wfProfileOut( __METHOD__ );
 594                         return $redirect;
 595                 }
 596
 597                 if ( $including && !$page->includable() ) {
 598                         wfProfileOut( __METHOD__ );
 599                         return false;
 600                 } elseif ( !$including ) {
 601                         $wgTitle = $page->getTitle();
 602                 }
 603                 $page->including( $including );
 604
 605                 // Execute special page
 606                 $profName = 'Special:' . $page->name();
 607                 wfProfileIn( $profName );
 608                 $page->execute( $par );
 609                 wfProfileOut( $profName );
 610                 wfProfileOut( __METHOD__ );
 611                 return true;
 612         }
 613
 614         /**
 615          * Just like executePath() except it returns the HTML instead of outputting it
 616          * Returns false if there was no such special page, or a title object if it was
 617          * a redirect.
 618          *
 619          * @return String: HTML fragment
 620          */
 621         static function capturePath( &$title ) {
 622                 global $wgOut, $wgTitle, $wgUser;
 623
 624                 $oldTitle = $wgTitle;
 625                 $oldOut = $wgOut;
 626                 $wgOut = new OutputPage;
 627                 $wgOut->setTitle( $title );
 628                 $wgOut->setUser( $wgUser ); # for now, there may be a better idea in the future
 629
 630                 $ret = SpecialPage::executePath( $title, true );
 631                 if ( $ret === true ) {
 632                         $ret = $wgOut->getHTML();
 633                 }
 634                 $wgTitle = $oldTitle;
 635                 $wgOut = $oldOut;
 636                 return $ret;
 637         }
 638
 639         /**
 640          * Get the local name for a specified canonical name
 641          *
 642          * @param $name String
 643          * @param $subpage Mixed: boolean false, or string
 644          *
 645          * @return String
 646          */
 647         static function getLocalNameFor( $name, $subpage = false ) {
 648                 global $wgContLang;
 649                 $aliases = $wgContLang->getSpecialPageAliases();
 650                 if ( isset( $aliases[$name][0] ) ) {
 651                         $name = $aliases[$name][0];
 652                 } else {
 653                         // Try harder in case someone misspelled the correct casing
 654                         $found = false;
 655                         foreach ( $aliases as $n => $values ) {
 656                                 if ( strcasecmp( $name, $n ) === 0 ) {
 657                                         wfWarn( "Found alias defined for $n when searching for " .
 658                                                 "special page aliases for $name. Case mismatch?" );
 659                                         $name = $values[0];
 660                                         $found = true;
 661                                         break;
 662                                 }
 663                         }
 664                         if ( !$found ) {
 665                                 wfWarn( "Did not find alias for special page '$name'. " .
 666                                         "Perhaps no aliases are defined for it?" );
 667                         }
 668                 }
 669                 if ( $subpage !== false && !is_null( $subpage ) ) {
 670                         $name = "$name/$subpage";
 671                 }
 672                 return $wgContLang->ucfirst( $name );
 673         }
 674
 675         /**
 676          * Get a localised Title object for a specified special page name
 677          *
 678          * @return Title object
 679          */
 680         static function getTitleFor( $name, $subpage = false ) {
 681                 $name = self::getLocalNameFor( $name, $subpage );
 682                 if ( $name ) {
 683                         return Title::makeTitle( NS_SPECIAL, $name );
 684                 } else {
 685                         throw new MWException( "Invalid special page name \"$name\"" );
 686                 }
 687         }
 688
 689         /**
 690          * Get a localised Title object for a page name with a possibly unvalidated subpage
 691          *
 692          * @return Title object or null if the page doesn't exist
 693          */
 694         static function getSafeTitleFor( $name, $subpage = false ) {
 695                 $name = self::getLocalNameFor( $name, $subpage );
 696                 if ( $name ) {
 697                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 698                 } else {
 699                         return null;
 700                 }
 701         }
 702
 703         /**
 704          * Get a title for a given alias
 705          *
 706          * @return Title or null if there is no such alias
 707          */
 708         static function getTitleForAlias( $alias ) {
 709                 $name = self::resolveAlias( $alias );
 710                 if ( $name ) {
 711                         return self::getTitleFor( $name );
 712                 } else {
 713                         return null;
 714                 }
 715         }
 716
 717         /**
 718          * Default constructor for special pages
 719          * Derivative classes should call this from their constructor
 720          *     Note that if the user does not have the required level, an error message will
 721          *     be displayed by the default execute() method, without the global function ever
 722          *     being called.
 723          *
 724          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 725          *     and displayRestrictionError()
 726          *
 727          * @param $name String: name of the special page, as seen in links and URLs
 728          * @param $restriction String: user right required, e.g. "block" or "delete"
 729          * @param $listed Boolean: whether the page is listed in Special:Specialpages
 730          * @param $function Callback: function called by execute(). By default it is constructed from $name
 731          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 732          * @param $includable Boolean: whether the page can be included in normal pages
 733          */
 734         public function __construct( $name = '', $restriction = '', $listed = true, $function = false, $file = 'default', $includable = false ) {
 735                 $this->init( $name, $restriction, $listed, $function, $file, $includable );
 736         }
 737
 738         /**
 739          * Do the real work for the constructor, mainly so __call() can intercept
 740          * calls to SpecialPage()
 741          * @see __construct() for param docs
 742          */
 743         private function init( $name, $restriction, $listed, $function, $file, $includable ) {
 744                 $this->mName = $name;
 745                 $this->mRestriction = $restriction;
 746                 $this->mListed = $listed;
 747                 $this->mIncludable = $includable;
 748                 if ( !$function ) {
 749                         $this->mFunction = 'wfSpecial'.$name;
 750                 } else {
 751                         $this->mFunction = $function;
 752                 }
 753                 if ( $file === 'default' ) {
 754                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 755                 } else {
 756                         $this->mFile = $file;
 757                 }
 758         }
 759
 760         /**
 761          * Use PHP's magic __call handler to get calls to the old PHP4 constructor
 762          * because PHP E_STRICT yells at you for having __construct() and SpecialPage()
 763          *
 764          * @param $fName String Name of called method
 765          * @param $a Array Arguments to the method
 766          * @deprecated Call isn't deprecated, but SpecialPage::SpecialPage() is
 767          */
 768         public function __call( $fName, $a ) {
 769                 // Sometimes $fName is SpecialPage, sometimes it's specialpage. <3 PHP
 770                 if( strtolower( $fName ) == 'specialpage' ) {
 771                         // Debug messages now, warnings in 1.19 or 1.20?
 772                         wfDebug( "Deprecated SpecialPage::SpecialPage() called, use __construct();\n" );
 773                         $name = isset( $a[0] ) ? $a[0] : '';
 774                         $restriction = isset( $a[1] ) ? $a[1] : '';
 775                         $listed = isset( $a[2] ) ? $a[2] : true;
 776                         $function = isset( $a[3] ) ? $a[3] : false;
 777                         $file = isset( $a[4] ) ? $a[4] : 'default';
 778                         $includable = isset( $a[5] ) ? $a[5] : false;
 779                         $this->init( $name, $restriction, $listed, $function, $file, $includable );
 780                 } else {
 781                         $className = get_class( $this );
 782                         throw new MWException( "Call to undefined method $className::$fName" );
 783                 }
 784         }
 785
 786         /**#@+
 787           * Accessor
 788           *
 789           * @deprecated
 790           */
 791         function getName() { return $this->mName; }
 792         function getRestriction() { return $this->mRestriction; }
 793         function getFile() { return $this->mFile; }
 794         function isListed() { return $this->mListed; }
 795         /**#@-*/
 796
 797         /**#@+
 798           * Accessor and mutator
 799           */
 800         function name( $x = null ) { return wfSetVar( $this->mName, $x ); }
 801         function restrictions( $x = null) {
 802                 # Use the one below this
 803                 wfDeprecated( __METHOD__ );
 804                 return wfSetVar( $this->mRestriction, $x );
 805         }
 806         function restriction( $x = null) { return wfSetVar( $this->mRestriction, $x ); }
 807         function listed( $x = null) { return wfSetVar( $this->mListed, $x ); }
 808         function func( $x = null) { return wfSetVar( $this->mFunction, $x ); }
 809         function file( $x = null) { return wfSetVar( $this->mFile, $x ); }
 810         function includable( $x = null ) { return wfSetVar( $this->mIncludable, $x ); }
 811         function including( $x = null ) { return wfSetVar( $this->mIncluding, $x ); }
 812         /**#@-*/
 813
 814         /**
 815          * Get the localised name of the special page
 816          */
 817         function getLocalName() {
 818                 if ( !isset( $this->mLocalName ) ) {
 819                         $this->mLocalName = self::getLocalNameFor( $this->mName );
 820                 }
 821                 return $this->mLocalName;
 822         }
 823
 824         /**
 825          * Is this page expensive (for some definition of expensive)?
 826          * Expensive pages are disabled or cached in miser mode.  Originally used
 827          * (and still overridden) by QueryPage and subclasses, moved here so that
 828          * Special:SpecialPages can safely call it for all special pages.
 829          *
 830          * @return Boolean
 831          */
 832         public function isExpensive() {
 833                 return false;
 834         }
 835
 836         /**
 837          * Can be overridden by subclasses with more complicated permissions
 838          * schemes.
 839          *
 840          * @return Boolean: should the page be displayed with the restricted-access
 841          *   pages?
 842          */
 843         public function isRestricted() {
 844                 global $wgGroupPermissions;
 845                 // DWIM: If all anons can do something, then it is not restricted
 846                 return $this->mRestriction != '' && empty($wgGroupPermissions['*'][$this->mRestriction]);
 847         }
 848
 849         /**
 850          * Checks if the given user (identified by an object) can execute this
 851          * special page (as defined by $mRestriction).  Can be overridden by sub-
 852          * classes with more complicated permissions schemes.
 853          *
 854          * @param $user User: the user to check
 855          * @return Boolean: does the user have permission to view the page?
 856          */
 857         public function userCanExecute( $user ) {
 858                 return $user->isAllowed( $this->mRestriction );
 859         }
 860
 861         /**
 862          * Output an error message telling the user what access level they have to have
 863          */
 864         function displayRestrictionError() {
 865                 global $wgOut;
 866                 $wgOut->permissionRequired( $this->mRestriction );
 867         }
 868
 869         /**
 870          * Sets headers - this should be called from the execute() method of all derived classes!
 871          */
 872         function setHeaders() {
 873                 global $wgOut;
 874                 $wgOut->setArticleRelated( false );
 875                 $wgOut->setRobotPolicy( "noindex,nofollow" );
 876                 $wgOut->setPageTitle( $this->getDescription() );
 877         }
 878
 879         /**
 880          * Default execute method
 881          * Checks user permissions, calls the function given in mFunction
 882          *
 883          * This may be overridden by subclasses.
 884          */
 885         function execute( $par ) {
 886                 global $wgUser;
 887
 888                 $this->setHeaders();
 889
 890                 if ( $this->userCanExecute( $wgUser ) ) {
 891                         $func = $this->mFunction;
 892                         // only load file if the function does not exist
 893                         if(!is_callable($func) and $this->mFile) {
 894                                 require_once( $this->mFile );
 895                         }
 896                         $this->outputHeader();
 897                         call_user_func( $func, $par, $this );
 898                 } else {
 899                         $this->displayRestrictionError();
 900                 }
 901         }
 902
 903         /**
 904          * Outputs a summary message on top of special pages
 905          * Per default the message key is the canonical name of the special page
 906          * May be overriden, i.e. by extensions to stick with the naming conventions
 907          * for message keys: 'extensionname-xxx'
 908          *
 909          * @param $summaryMessageKey String: message key of the summary
 910          */
 911         function outputHeader( $summaryMessageKey = '' ) {
 912                 global $wgOut, $wgContLang;
 913
 914                 if( $summaryMessageKey == '' ) {
 915                         $msg = $wgContLang->lc( $this->name() ) . '-summary';
 916                 } else {
 917                         $msg = $summaryMessageKey;
 918                 }
 919                 if ( !wfMessage( $msg )->isBlank() and ! $this->including() ) {
 920                         $wgOut->wrapWikiMsg( "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 921                 }
 922
 923         }
 924
 925         /**
 926          * Returns the name that goes in the \<h1\> in the special page itself, and
 927          * also the name that will be listed in Special:Specialpages
 928          *
 929          * Derived classes can override this, but usually it is easier to keep the
 930          * default behaviour. Messages can be added at run-time, see
 931          * MessageCache.php.
 932          *
 933          * @return String
 934          */
 935         function getDescription() {
 936                 return wfMsg( strtolower( $this->mName ) );
 937         }
 938
 939         /**
 940          * Get a self-referential title object
 941          *
 942          * @return Title object
 943          */
 944         function getTitle( $subpage = false ) {
 945                 return self::getTitleFor( $this->mName, $subpage );
 946         }
 947
 948         /**
 949          * Set whether this page is listed in Special:Specialpages, at run-time
 950          */
 951         function setListed( $listed ) {
 952                 return wfSetVar( $this->mListed, $listed );
 953         }
 954
 955         /**
 956          * If the special page is a redirect, then get the Title object it redirects to.
 957          * False otherwise.
 958          */
 959         function getRedirect( $subpage ) {
 960                 return false;
 961         }
 962
 963         /**
 964          * Return part of the request string for a special redirect page
 965          * This allows passing, e.g. action=history to Special:Mypage, etc.
 966          *
 967          * @return String
 968          */
 969         function getRedirectQuery() {
 970                 global $wgRequest;
 971                 $params = array();
 972
 973                 foreach( $this->mAllowedRedirectParams as $arg ) {
 974                         if( $wgRequest->getVal( $arg, null ) !== null ){
 975                                 $params[$arg] = $wgRequest->getVal( $arg );
 976                         }
 977                 }
 978
 979                 foreach( $this->mAddedRedirectParams as $arg => $val ) {
 980                         $params[$arg] = $val;
 981                 }
 982
 983                 return count( $params )
 984                         ? $params
 985                         : false;
 986         }
 987
 988         /**
 989          * Sets the context this SpecialPage is executed in
 990          *
 991          * @param $request WebRequest
 992          * @param $output OutputPage
 993          */
 994         protected function setContext( $request, $output ) {
 995                 $this->mRequest = $request;
 996                 $this->mOutput = $output;
 997                 $this->mFullTitle = $output->getTitle();
 998         }
 999         /**
1000          * Wrapper around wfMessage that sets the current context. Currently this
1001          * is only the title.
1002          *
1003          * @see wfMessage
1004          */
1005         public function msg( /* $args */ ) {
1006                 return call_user_func_array( 'wfMessage', func_get_args() )->title( $this->mFullTitle );
1007         }
1008 }
1009
1010 /**
1011  * Shortcut to construct a special page which is unlisted by default
1012  * @ingroup SpecialPage
1013  */
1014 class UnlistedSpecialPage extends SpecialPage
1015 {
1016         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
1017                 parent::__construct( $name, $restriction, false, $function, $file );
1018         }
1019 }
1020
1021 /**
1022  * Shortcut to construct an includable special  page
1023  * @ingroup SpecialPage
1024  */
1025 class IncludableSpecialPage extends SpecialPage
1026 {
1027         function __construct( $name, $restriction = '', $listed = true, $function = false, $file = 'default' ) {
1028                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
1029         }
1030 }
1031
1032 /**
1033  * Shortcut to construct a special page alias.
1034  * @ingroup SpecialPage
1035  */
1036 class SpecialRedirectToSpecial extends UnlistedSpecialPage {
1037         var $redirName, $redirSubpage;
1038
1039         function __construct( $name, $redirName, $redirSubpage = false, $allowedRedirectParams = array(), $addedRedirectParams = array() ) {
1040                 parent::__construct( $name );
1041                 $this->redirName = $redirName;
1042                 $this->redirSubpage = $redirSubpage;
1043                 $this->mAllowedRedirectParams = $allowedRedirectParams;
1044                 $this->mAddedRedirectParams = $addedRedirectParams;
1045         }
1046
1047         function getRedirect( $subpage ) {
1048                 if ( $this->redirSubpage === false ) {
1049                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
1050                 } else {
1051                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
1052                 }
1053         }
1054 }
1055
1056 /**
1057  * SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
1058  * are used to get user independant links pointing to the user page, talk
1059  * page and list of contributions.
1060  * This can let us cache a single copy of any generated content for all
1061  * users.
1062  */
1063
1064 /**
1065  * Shortcut to construct a special page pointing to current user user's page.
1066  * @ingroup SpecialPage
1067  */
1068 class SpecialMypage extends UnlistedSpecialPage {
1069         function __construct() {
1070                 parent::__construct( 'Mypage' );
1071                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1072                         'section', 'oldid', 'diff', 'dir' );
1073         }
1074
1075         function getRedirect( $subpage ) {
1076                 global $wgUser;
1077                 if ( strval( $subpage ) !== '' ) {
1078                         return Title::makeTitle( NS_USER, $wgUser->getName() . '/' . $subpage );
1079                 } else {
1080                         return Title::makeTitle( NS_USER, $wgUser->getName() );
1081                 }
1082         }
1083 }
1084
1085 /**
1086  * Shortcut to construct a special page pointing to current user talk page.
1087  * @ingroup SpecialPage
1088  */
1089 class SpecialMytalk extends UnlistedSpecialPage {
1090         function __construct() {
1091                 parent::__construct( 'Mytalk' );
1092                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1093                         'section', 'oldid', 'diff', 'dir' );
1094         }
1095
1096         function getRedirect( $subpage ) {
1097                 global $wgUser;
1098                 if ( strval( $subpage ) !== '' ) {
1099                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() . '/' . $subpage );
1100                 } else {
1101                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() );
1102                 }
1103         }
1104 }
1105
1106 /**
1107  * Shortcut to construct a special page pointing to current user contributions.
1108  * @ingroup SpecialPage
1109  */
1110 class SpecialMycontributions extends UnlistedSpecialPage {
1111         function __construct() {
1112                 parent::__construct(  'Mycontributions' );
1113                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
1114                         'offset', 'dir', 'year', 'month', 'feed' );
1115         }
1116
1117         function getRedirect( $subpage ) {
1118                 global $wgUser;
1119                 return SpecialPage::getTitleFor( 'Contributions', $wgUser->getName() );
1120         }
1121 }
1122
1123 /**
1124  * Redirect to Special:Listfiles?user=$wgUser
1125  */
1126 class SpecialMyuploads extends UnlistedSpecialPage {
1127         function __construct() {
1128                 parent::__construct( 'Myuploads' );
1129                 $this->mAllowedRedirectParams = array( 'limit' );
1130         }
1131
1132         function getRedirect( $subpage ) {
1133                 global $wgUser;
1134                 return SpecialPage::getTitleFor( 'Listfiles', $wgUser->getName() );
1135         }
1136 }
1137
1138 /**
1139  * Redirect from Special:PermanentLink/### to index.php?oldid=###
1140  */
1141 class SpecialPermanentLink extends UnlistedSpecialPage {
1142         function __construct() {
1143                 parent::__construct( 'PermanentLink' );
1144                 $this->mAllowedRedirectParams = array();
1145         }
1146
1147         function getRedirect( $subpage ) {
1148                 $subpage = intval( $subpage );
1149                 $this->mAddedRedirectParams['oldid'] = $subpage;
1150                 return true;
1151         }
1152 }