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                 'DisableAccount'            => 'SpecialDisableAccount',
 137
 138                 # Recent changes and logs
 139                 'Newimages'                 => array( 'IncludableSpecialPage', 'Newimages' ),
 140                 'Log'                       => 'SpecialLog',
 141                 'Watchlist'                 => array( 'SpecialPage', 'Watchlist' ),
 142                 'Newpages'                  => 'SpecialNewpages',
 143                 'Recentchanges'             => 'SpecialRecentchanges',
 144                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 145                 'Tags'                      => 'SpecialTags',
 146
 147                 # Media reports and uploads
 148                 'Listfiles'                 => array( 'SpecialPage', 'Listfiles' ),
 149                 'Filepath'                  => 'SpecialFilepath',
 150                 'MIMEsearch'                => array( 'SpecialPage', 'MIMEsearch' ),
 151                 'FileDuplicateSearch'       => array( 'SpecialPage', 'FileDuplicateSearch' ),
 152                 'Upload'                    => 'SpecialUpload',
 153                 'UploadStash'        => 'SpecialUploadStash',
 154
 155                 # Wiki data and tools
 156                 'Statistics'                => 'SpecialStatistics',
 157                 'Allmessages'               => 'SpecialAllmessages',
 158                 'Version'                   => 'SpecialVersion',
 159                 'Lockdb'                    => 'SpecialLockdb',
 160                 'Unlockdb'                  => 'SpecialUnlockdb',
 161
 162                 # Redirecting special pages
 163                 'LinkSearch'                => array( 'SpecialPage', 'LinkSearch' ),
 164                 'Randompage'                => 'Randompage',
 165                 'Randomredirect'            => 'SpecialRandomredirect',
 166
 167                 # High use pages
 168                 'Mostlinkedcategories'      => array( 'SpecialPage', 'Mostlinkedcategories' ),
 169                 'Mostimages'                => array( 'SpecialPage', 'Mostimages' ),
 170                 'Mostlinked'                => array( 'SpecialPage', 'Mostlinked' ),
 171                 'Mostlinkedtemplates'       => array( 'SpecialPage', 'Mostlinkedtemplates' ),
 172                 'Mostcategories'            => array( 'SpecialPage', 'Mostcategories' ),
 173                 'Mostrevisions'             => array( 'SpecialPage', 'Mostrevisions' ),
 174
 175                 # Page tools
 176                 'ComparePages'              => 'SpecialComparePages',
 177                 'Export'                    => 'SpecialExport',
 178                 'Import'                    => 'SpecialImport',
 179                 'Undelete'                  => 'UndeleteForm',
 180                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 181                 'MergeHistory'              => 'SpecialMergeHistory',
 182
 183                 # Other
 184                 'Booksources'               => 'SpecialBookSources',
 185
 186                 # Unlisted / redirects
 187                 'Blankpage'                 => 'SpecialBlankpage',
 188                 'Blockme'                   => 'SpecialBlockme',
 189                 'Emailuser'                 => 'SpecialEmailUser',
 190                 'Movepage'                  => 'MovePageForm',
 191                 'Mycontributions'           => 'SpecialMycontributions',
 192                 'Mypage'                    => 'SpecialMypage',
 193                 'Mytalk'                    => 'SpecialMytalk',
 194                 'Revisiondelete'            => 'SpecialRevisionDelete',
 195                 'RevisionMove'              => 'SpecialRevisionMove',
 196                 'Specialpages'              => 'SpecialSpecialpages',
 197                 'Userlogout'                => 'SpecialUserlogout',
 198         );
 199
 200         static public $mAliases;
 201         static public $mListInitialised = false;
 202
 203         /**#@-*/
 204
 205         /**
 206          * Initialise the special page list
 207          * This must be called before accessing SpecialPage::$mList
 208          */
 209         static function initList() {
 210                 global $wgSpecialPages;
 211                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 212
 213                 if ( self::$mListInitialised ) {
 214                         return;
 215                 }
 216                 wfProfileIn( __METHOD__ );
 217
 218                 # Better to set this now, to avoid infinite recursion in carelessly written hooks
 219                 self::$mListInitialised = true;
 220
 221                 if( !$wgDisableCounters ) {
 222                         self::$mList['Popularpages'] = array( 'SpecialPage', 'Popularpages' );
 223                 }
 224
 225                 if( !$wgDisableInternalSearch ) {
 226                         self::$mList['Search'] = array( 'SpecialPage', 'Search' );
 227                 }
 228
 229                 if( $wgEmailAuthentication ) {
 230                         self::$mList['Confirmemail'] = 'EmailConfirmation';
 231                         self::$mList['Invalidateemail'] = 'EmailInvalidation';
 232                 }
 233
 234                 # Add extension special pages
 235                 self::$mList = array_merge( self::$mList, $wgSpecialPages );
 236
 237                 # Run hooks
 238                 # This hook can be used to remove undesired built-in special pages
 239                 wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 240                 wfProfileOut( __METHOD__ );
 241         }
 242
 243         static function initAliasList() {
 244                 if ( !is_null( self::$mAliases ) ) {
 245                         return;
 246                 }
 247
 248                 global $wgContLang;
 249                 $aliases = $wgContLang->getSpecialPageAliases();
 250                 $missingPages = self::$mList;
 251                 self::$mAliases = array();
 252                 foreach ( $aliases as $realName => $aliasList ) {
 253                         foreach ( $aliasList as $alias ) {
 254                                 self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 255                         }
 256                         unset( $missingPages[$realName] );
 257                 }
 258                 foreach ( $missingPages as $name => $stuff ) {
 259                         self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 260                 }
 261         }
 262
 263         /**
 264          * Given a special page alias, return the special page name.
 265          * Returns false if there is no such alias.
 266          *
 267          * @param $alias String
 268          * @return String or false
 269          */
 270         static function resolveAlias( $alias ) {
 271                 global $wgContLang;
 272
 273                 if ( !self::$mListInitialised ) self::initList();
 274                 if ( is_null( self::$mAliases ) ) self::initAliasList();
 275                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 276                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 277                 if ( isset( self::$mAliases[$caseFoldedAlias] ) ) {
 278                         return self::$mAliases[$caseFoldedAlias];
 279                 } else {
 280                         return false;
 281                 }
 282         }
 283
 284         /**
 285          * Given a special page name with a possible subpage, return an array
 286          * where the first element is the special page name and the second is the
 287          * subpage.
 288          *
 289          * @param $alias String
 290          * @return Array
 291          */
 292         static function resolveAliasWithSubpage( $alias ) {
 293                 $bits = explode( '/', $alias, 2 );
 294                 $name = self::resolveAlias( $bits[0] );
 295                 if( !isset( $bits[1] ) ) { // bug 2087
 296                         $par = null;
 297                 } else {
 298                         $par = $bits[1];
 299                 }
 300                 return array( $name, $par );
 301         }
 302
 303         /**
 304          * Add a page to the list of valid special pages. This used to be the preferred
 305          * method for adding special pages in extensions. It's now suggested that you add
 306          * an associative record to $wgSpecialPages. This avoids autoloading SpecialPage.
 307          *
 308          * @param $page SpecialPage
 309          * Deprecated in 1.7, warnings in 1.17, might be removed in 1.20
 310          */
 311         static function addPage( &$page ) {
 312                 wfDeprecated( __METHOD__ );
 313                 if ( !self::$mListInitialised ) {
 314                         self::initList();
 315                 }
 316                 self::$mList[$page->mName] = $page;
 317         }
 318
 319         /**
 320          * Add a page to a certain display group for Special:SpecialPages
 321          *
 322          * @param $page Mixed: SpecialPage or string
 323          * @param $group String
 324          */
 325         static function setGroup( $page, $group ) {
 326                 global $wgSpecialPageGroups;
 327                 $name = is_object($page) ? $page->mName : $page;
 328                 $wgSpecialPageGroups[$name] = $group;
 329         }
 330
 331         /**
 332          * Add a page to a certain display group for Special:SpecialPages
 333          *
 334          * @param $page SpecialPage
 335          */
 336         static function getGroup( &$page ) {
 337                 global $wgSpecialPageGroups;
 338                 static $specialPageGroupsCache = array();
 339                 if( isset($specialPageGroupsCache[$page->mName]) ) {
 340                         return $specialPageGroupsCache[$page->mName];
 341                 }
 342                 $group = wfMsg('specialpages-specialpagegroup-'.strtolower($page->mName));
 343                 if( $group == ''
 344                  || wfEmptyMsg('specialpages-specialpagegroup-'.strtolower($page->mName), $group ) ) {
 345                         $group = isset($wgSpecialPageGroups[$page->mName])
 346                                 ? $wgSpecialPageGroups[$page->mName]
 347                                 : '-';
 348                 }
 349                 if( $group == '-' ) $group = 'other';
 350                 $specialPageGroupsCache[$page->mName] = $group;
 351                 return $group;
 352         }
 353
 354         /**
 355          * Remove a special page from the list
 356          * Formerly used to disable expensive or dangerous special pages. The
 357          * preferred method is now to add a SpecialPage_initList hook.
 358          */
 359         static function removePage( $name ) {
 360                 if ( !self::$mListInitialised ) {
 361                         self::initList();
 362                 }
 363                 unset( self::$mList[$name] );
 364         }
 365
 366         /**
 367          * Check if a given name exist as a special page or as a special page alias
 368          *
 369          * @param $name String: name of a special page
 370          * @return Boolean: true if a special page exists with this name
 371          */
 372         static function exists( $name ) {
 373                 global $wgContLang;
 374                 if ( !self::$mListInitialised ) {
 375                         self::initList();
 376                 }
 377                 if( !self::$mAliases ) {
 378                         self::initAliasList();
 379                 }
 380
 381                 # Remove special pages inline parameters:
 382                 $bits = explode( '/', $name );
 383                 $name = $wgContLang->caseFold($bits[0]);
 384
 385                 return
 386                         array_key_exists( $name, self::$mList )
 387                         or array_key_exists( $name, self::$mAliases )
 388                 ;
 389         }
 390
 391         /**
 392          * Find the object with a given name and return it (or NULL)
 393          *
 394          * @param $name String
 395          * @return SpecialPage object or null if the page doesn't exist
 396          */
 397         static function getPage( $name ) {
 398                 if ( !self::$mListInitialised ) {
 399                         self::initList();
 400                 }
 401                 if ( array_key_exists( $name, self::$mList ) ) {
 402                         $rec = self::$mList[$name];
 403                         if ( is_string( $rec ) ) {
 404                                 $className = $rec;
 405                                 self::$mList[$name] = new $className;
 406                         } elseif ( is_array( $rec ) ) {
 407                                 $className = array_shift( $rec );
 408                                 self::$mList[$name] = wfCreateObject( $className, $rec );
 409                         }
 410                         return self::$mList[$name];
 411                 } else {
 412                         return null;
 413                 }
 414         }
 415
 416         /**
 417          * Get a special page with a given localised name, or NULL if there
 418          * is no such special page.
 419          *
 420          * @return SpecialPage object or null if the page doesn't exist
 421          */
 422         static function getPageByAlias( $alias ) {
 423                 $realName = self::resolveAlias( $alias );
 424                 if ( $realName ) {
 425                         return self::getPage( $realName );
 426                 } else {
 427                         return null;
 428                 }
 429         }
 430
 431         /**
 432          * Return categorised listable special pages which are available
 433          * for the current user, and everyone.
 434          *
 435          * @return Associative array mapping page's name to its SpecialPage object
 436          */
 437         static function getUsablePages() {
 438                 global $wgUser;
 439                 if ( !self::$mListInitialised ) {
 440                         self::initList();
 441                 }
 442                 $pages = array();
 443
 444                 foreach ( self::$mList as $name => $rec ) {
 445                         $page = self::getPage( $name );
 446                         if ( $page->isListed()
 447                                 && (
 448                                         !$page->isRestricted()
 449                                         || $page->userCanExecute( $wgUser )
 450                                 )
 451                         ) {
 452                                 $pages[$name] = $page;
 453                         }
 454                 }
 455                 return $pages;
 456         }
 457
 458         /**
 459          * Return categorised listable special pages for all users
 460          *
 461          * @return Associative array mapping page's name to its SpecialPage object
 462          */
 463         static function getRegularPages() {
 464                 if ( !self::$mListInitialised ) {
 465                         self::initList();
 466                 }
 467                 $pages = array();
 468
 469                 foreach ( self::$mList as $name => $rec ) {
 470                         $page = self::getPage( $name );
 471                         if ( $page->isListed() && !$page->isRestricted() ) {
 472                                 $pages[$name] = $page;
 473                         }
 474                 }
 475                 return $pages;
 476         }
 477
 478         /**
 479          * Return categorised listable special pages which are available
 480          * for the current user, but not for everyone
 481          *
 482          * @return Associative array mapping page's name to its SpecialPage object
 483          */
 484         static function getRestrictedPages() {
 485                 global $wgUser;
 486                 if( !self::$mListInitialised ) {
 487                         self::initList();
 488                 }
 489                 $pages = array();
 490
 491                 foreach( self::$mList as $name => $rec ) {
 492                         $page = self::getPage( $name );
 493                         if(
 494                                 $page->isListed()
 495                                 && $page->isRestricted()
 496                                 && $page->userCanExecute( $wgUser )
 497                         ) {
 498                                 $pages[$name] = $page;
 499                         }
 500                 }
 501                 return $pages;
 502         }
 503
 504         /**
 505          * Execute a special page path.
 506          * The path     may contain parameters, e.g. Special:Name/Params
 507          * Extracts the special page name and call the execute method, passing the parameters
 508          *
 509          * Returns a title object if the page is redirected, false if there was no such special
 510          * page, and true if it was successful.
 511          *
 512          * @param $title          a title object
 513          * @param $including      output is being captured for use in {{special:whatever}}
 514          */
 515         static function executePath( &$title, $including = false ) {
 516                 global $wgOut, $wgTitle, $wgRequest;
 517                 wfProfileIn( __METHOD__ );
 518
 519                 # FIXME: redirects broken due to this call
 520                 $bits = explode( '/', $title->getDBkey(), 2 );
 521                 $name = $bits[0];
 522                 if( !isset( $bits[1] ) ) { // bug 2087
 523                         $par = null;
 524                 } else {
 525                         $par = $bits[1];
 526                 }
 527                 $page = SpecialPage::getPageByAlias( $name );
 528                 # Nonexistent?
 529                 if ( !$page ) {
 530                         if ( !$including ) {
 531                                 $wgOut->setArticleRelated( false );
 532                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 533                                 $wgOut->setStatusCode( 404 );
 534                                 $wgOut->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 535                         }
 536                         wfProfileOut( __METHOD__ );
 537                         return false;
 538                 }
 539
 540                 # Check for redirect
 541                 if ( !$including ) {
 542                         $redirect = $page->getRedirect( $par );
 543                         if ( $redirect ) {
 544                                 $query = $page->getRedirectQuery();
 545                                 $url = $redirect->getFullUrl( $query );
 546                                 $wgOut->redirect( $url );
 547                                 wfProfileOut( __METHOD__ );
 548                                 return $redirect;
 549                         }
 550                 }
 551
 552                 # Redirect to canonical alias for GET commands
 553                 # Not for POST, we'd lose the post data, so it's best to just distribute
 554                 # the request. Such POST requests are possible for old extensions that
 555                 # generate self-links without being aware that their default name has
 556                 # changed.
 557                 if ( !$including && $name != $page->getLocalName() && !$wgRequest->wasPosted() ) {
 558                         $query = $_GET;
 559                         unset( $query['title'] );
 560                         $query = wfArrayToCGI( $query );
 561                         $title = $page->getTitle( $par );
 562                         $url = $title->getFullUrl( $query );
 563                         $wgOut->redirect( $url );
 564                         wfProfileOut( __METHOD__ );
 565                         return $redirect;
 566                 }
 567
 568                 if ( $including && !$page->includable() ) {
 569                         wfProfileOut( __METHOD__ );
 570                         return false;
 571                 } elseif ( !$including ) {
 572                         $wgTitle = $page->getTitle();
 573                 }
 574                 $page->including( $including );
 575
 576                 // Execute special page
 577                 $profName = 'Special:' . $page->name();
 578                 wfProfileIn( $profName );
 579                 $page->execute( $par );
 580                 wfProfileOut( $profName );
 581                 wfProfileOut( __METHOD__ );
 582                 return true;
 583         }
 584
 585         /**
 586          * Just like executePath() except it returns the HTML instead of outputting it
 587          * Returns false if there was no such special page, or a title object if it was
 588          * a redirect.
 589          *
 590          * @return String: HTML fragment
 591          */
 592         static function capturePath( &$title ) {
 593                 global $wgOut, $wgTitle;
 594
 595                 $oldTitle = $wgTitle;
 596                 $oldOut = $wgOut;
 597                 $wgOut = new OutputPage;
 598                 $wgOut->setTitle( $title );
 599
 600                 $ret = SpecialPage::executePath( $title, true );
 601                 if ( $ret === true ) {
 602                         $ret = $wgOut->getHTML();
 603                 }
 604                 $wgTitle = $oldTitle;
 605                 $wgOut = $oldOut;
 606                 return $ret;
 607         }
 608
 609         /**
 610          * Get the local name for a specified canonical name
 611          *
 612          * @param $name String
 613          * @param $subpage Mixed: boolean false, or string
 614          *
 615          * @return String
 616          */
 617         static function getLocalNameFor( $name, $subpage = false ) {
 618                 global $wgContLang;
 619                 $aliases = $wgContLang->getSpecialPageAliases();
 620                 if ( isset( $aliases[$name][0] ) ) {
 621                         $name = $aliases[$name][0];
 622                 } else {
 623                         // Try harder in case someone misspelled the correct casing
 624                         $found = false;
 625                         foreach ( $aliases as $n => $values ) {
 626                                 if ( strcasecmp( $name, $n ) === 0 ) {
 627                                         wfWarn( "Found alias defined for $n when searching for" .
 628                                                 "special page aliases for $name. Case mismatch?" );
 629                                         $name = $values[0];
 630                                         $found = true;
 631                                         break;
 632                                 }
 633                         }
 634                         if ( !$found ) {
 635                                 wfWarn( "Did not find alias for special page '$name'. " .
 636                                         "Perhaps no aliases are defined for it?" );
 637                         }
 638                 }
 639                 if ( $subpage !== false && !is_null( $subpage ) ) {
 640                         $name = "$name/$subpage";
 641                 }
 642                 return $wgContLang->ucfirst( $name );
 643         }
 644
 645         /**
 646          * Get a localised Title object for a specified special page name
 647          *
 648          * @return Title object
 649          */
 650         static function getTitleFor( $name, $subpage = false ) {
 651                 $name = self::getLocalNameFor( $name, $subpage );
 652                 if ( $name ) {
 653                         return Title::makeTitle( NS_SPECIAL, $name );
 654                 } else {
 655                         throw new MWException( "Invalid special page name \"$name\"" );
 656                 }
 657         }
 658
 659         /**
 660          * Get a localised Title object for a page name with a possibly unvalidated subpage
 661          *
 662          * @return Title object or null if the page doesn't exist
 663          */
 664         static function getSafeTitleFor( $name, $subpage = false ) {
 665                 $name = self::getLocalNameFor( $name, $subpage );
 666                 if ( $name ) {
 667                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 668                 } else {
 669                         return null;
 670                 }
 671         }
 672
 673         /**
 674          * Get a title for a given alias
 675          *
 676          * @return Title or null if there is no such alias
 677          */
 678         static function getTitleForAlias( $alias ) {
 679                 $name = self::resolveAlias( $alias );
 680                 if ( $name ) {
 681                         return self::getTitleFor( $name );
 682                 } else {
 683                         return null;
 684                 }
 685         }
 686
 687         /**
 688          * Default constructor for special pages
 689          * Derivative classes should call this from their constructor
 690          *     Note that if the user does not have the required level, an error message will
 691          *     be displayed by the default execute() method, without the global function ever
 692          *     being called.
 693          *
 694          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 695          *     and displayRestrictionError()
 696          *
 697          * @param $name String: name of the special page, as seen in links and URLs
 698          * @param $restriction String: user right required, e.g. "block" or "delete"
 699          * @param $listed Boolean: whether the page is listed in Special:Specialpages
 700          * @param $function Callback: function called by execute(). By default it is constructed from $name
 701          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 702          * @param $includable Boolean: whether the page can be included in normal pages
 703          */
 704         function __construct( $name = '', $restriction = '', $listed = true, $function = false, $file = 'default', $includable = false ) {
 705                 $this->mName = $name;
 706                 $this->mRestriction = $restriction;
 707                 $this->mListed = $listed;
 708                 $this->mIncludable = $includable;
 709                 if ( !$function ) {
 710                         $this->mFunction = 'wfSpecial'.$name;
 711                 } else {
 712                         $this->mFunction = $function;
 713                 }
 714                 if ( $file === 'default' ) {
 715                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 716                 } else {
 717                         $this->mFile = $file;
 718                 }
 719         }
 720
 721         /**#@+
 722           * Accessor
 723           *
 724           * @deprecated
 725           */
 726         function getName() { return $this->mName; }
 727         function getRestriction() { return $this->mRestriction; }
 728         function getFile() { return $this->mFile; }
 729         function isListed() { return $this->mListed; }
 730         /**#@-*/
 731
 732         /**#@+
 733           * Accessor and mutator
 734           */
 735         function name( $x = null ) { return wfSetVar( $this->mName, $x ); }
 736         function restrictions( $x = null) {
 737                 # Use the one below this
 738                 wfDeprecated( __METHOD__ );
 739                 return wfSetVar( $this->mRestriction, $x );
 740         }
 741         function restriction( $x = null) { return wfSetVar( $this->mRestriction, $x ); }
 742         function listed( $x = null) { return wfSetVar( $this->mListed, $x ); }
 743         function func( $x = null) { return wfSetVar( $this->mFunction, $x ); }
 744         function file( $x = null) { return wfSetVar( $this->mFile, $x ); }
 745         function includable( $x = null ) { return wfSetVar( $this->mIncludable, $x ); }
 746         function including( $x = null ) { return wfSetVar( $this->mIncluding, $x ); }
 747         /**#@-*/
 748
 749         /**
 750          * Get the localised name of the special page
 751          */
 752         function getLocalName() {
 753                 if ( !isset( $this->mLocalName ) ) {
 754                         $this->mLocalName = self::getLocalNameFor( $this->mName );
 755                 }
 756                 return $this->mLocalName;
 757         }
 758
 759         /**
 760          * Can be overridden by subclasses with more complicated permissions
 761          * schemes.
 762          *
 763          * @return Boolean: should the page be displayed with the restricted-access
 764          *   pages?
 765          */
 766         public function isRestricted() {
 767                 global $wgGroupPermissions;
 768                 // DWIM: If all anons can do something, then it is not restricted
 769                 return $this->mRestriction != '' && empty($wgGroupPermissions['*'][$this->mRestriction]);
 770         }
 771
 772         /**
 773          * Checks if the given user (identified by an object) can execute this
 774          * special page (as defined by $mRestriction).  Can be overridden by sub-
 775          * classes with more complicated permissions schemes.
 776          *
 777          * @param $user User: the user to check
 778          * @return Boolean: does the user have permission to view the page?
 779          */
 780         public function userCanExecute( $user ) {
 781                 return $user->isAllowed( $this->mRestriction );
 782         }
 783
 784         /**
 785          * Output an error message telling the user what access level they have to have
 786          */
 787         function displayRestrictionError() {
 788                 global $wgOut;
 789                 $wgOut->permissionRequired( $this->mRestriction );
 790         }
 791
 792         /**
 793          * Sets headers - this should be called from the execute() method of all derived classes!
 794          */
 795         function setHeaders() {
 796                 global $wgOut;
 797                 $wgOut->setArticleRelated( false );
 798                 $wgOut->setRobotPolicy( "noindex,nofollow" );
 799                 $wgOut->setPageTitle( $this->getDescription() );
 800         }
 801
 802         /**
 803          * Default execute method
 804          * Checks user permissions, calls the function given in mFunction
 805          *
 806          * This may be overridden by subclasses.
 807          */
 808         function execute( $par ) {
 809                 global $wgUser;
 810
 811                 $this->setHeaders();
 812
 813                 if ( $this->userCanExecute( $wgUser ) ) {
 814                         $func = $this->mFunction;
 815                         // only load file if the function does not exist
 816                         if(!is_callable($func) and $this->mFile) {
 817                                 require_once( $this->mFile );
 818                         }
 819                         $this->outputHeader();
 820                         call_user_func( $func, $par, $this );
 821                 } else {
 822                         $this->displayRestrictionError();
 823                 }
 824         }
 825
 826         /**
 827          * Outputs a summary message on top of special pages
 828          * Per default the message key is the canonical name of the special page
 829          * May be overriden, i.e. by extensions to stick with the naming conventions
 830          * for message keys: 'extensionname-xxx'
 831          *
 832          * @param $summaryMessageKey String: message key of the summary
 833          */
 834         function outputHeader( $summaryMessageKey = '' ) {
 835                 global $wgOut, $wgContLang;
 836
 837                 if( $summaryMessageKey == '' ) {
 838                         $msg = $wgContLang->lc( $this->name() ) . '-summary';
 839                 } else {
 840                         $msg = $summaryMessageKey;
 841                 }
 842                 $out = wfMsgNoTrans( $msg );
 843                 if ( ! wfEmptyMsg( $msg, $out ) and  $out !== '' and ! $this->including() ) {
 844                         $wgOut->wrapWikiMsg( "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 845                 }
 846
 847         }
 848
 849         /**
 850          * Returns the name that goes in the \<h1\> in the special page itself, and
 851          * also the name that will be listed in Special:Specialpages
 852          *
 853          * Derived classes can override this, but usually it is easier to keep the
 854          * default behaviour. Messages can be added at run-time, see
 855          * MessageCache.php.
 856          *
 857          * @return String
 858          */
 859         function getDescription() {
 860                 return wfMsg( strtolower( $this->mName ) );
 861         }
 862
 863         /**
 864          * Get a self-referential title object
 865          *
 866          * @return Title object
 867          */
 868         function getTitle( $subpage = false ) {
 869                 return self::getTitleFor( $this->mName, $subpage );
 870         }
 871
 872         /**
 873          * Set whether this page is listed in Special:Specialpages, at run-time
 874          */
 875         function setListed( $listed ) {
 876                 return wfSetVar( $this->mListed, $listed );
 877         }
 878
 879         /**
 880          * If the special page is a redirect, then get the Title object it redirects to.
 881          * False otherwise.
 882          */
 883         function getRedirect( $subpage ) {
 884                 return false;
 885         }
 886
 887         /**
 888          * Return part of the request string for a special redirect page
 889          * This allows passing, e.g. action=history to Special:Mypage, etc.
 890          *
 891          * @return String
 892          */
 893         function getRedirectQuery() {
 894                 global $wgRequest;
 895                 $params = array();
 896                 foreach( $this->mAllowedRedirectParams as $arg ) {
 897                         if( ( $val = $wgRequest->getVal( $arg, null ) ) !== null )
 898                                 $params[] = $arg . '=' . $val;
 899                 }
 900
 901                 foreach( $this->mAddedRedirectParams as $arg => $val ) {
 902                         $params[] = $arg . '=' . $val;
 903                 }
 904
 905                 return count( $params ) ? implode( '&', $params ) : false;
 906         }
 907 }
 908
 909 /**
 910  * Shortcut to construct a special page which is unlisted by default
 911  * @ingroup SpecialPage
 912  */
 913 class UnlistedSpecialPage extends SpecialPage
 914 {
 915         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
 916                 parent::__construct( $name, $restriction, false, $function, $file );
 917         }
 918 }
 919
 920 /**
 921  * Shortcut to construct an includable special  page
 922  * @ingroup SpecialPage
 923  */
 924 class IncludableSpecialPage extends SpecialPage
 925 {
 926         function __construct( $name, $restriction = '', $listed = true, $function = false, $file = 'default' ) {
 927                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
 928         }
 929 }
 930
 931 /**
 932  * Shortcut to construct a special page alias.
 933  * @ingroup SpecialPage
 934  */
 935 class SpecialRedirectToSpecial extends UnlistedSpecialPage {
 936         var $redirName, $redirSubpage;
 937
 938         function __construct( $name, $redirName, $redirSubpage = false, $allowedRedirectParams = array(), $addedRedirectParams = array() ) {
 939                 parent::__construct( $name );
 940                 $this->redirName = $redirName;
 941                 $this->redirSubpage = $redirSubpage;
 942                 $this->mAllowedRedirectParams = $allowedRedirectParams;
 943                 $this->mAddedRedirectParams = $addedRedirectParams;
 944         }
 945
 946         function getRedirect( $subpage ) {
 947                 if ( $this->redirSubpage === false ) {
 948                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
 949                 } else {
 950                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
 951                 }
 952         }
 953 }
 954
 955 /** SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
 956  * are used to get user independant links pointing to the user page, talk
 957  * page and list of contributions.
 958  * This can let us cache a single copy of any generated content for all
 959  * users.
 960  */
 961
 962 /**
 963  * Shortcut to construct a special page pointing to current user user's page.
 964  * @ingroup SpecialPage
 965  */
 966 class SpecialMypage extends UnlistedSpecialPage {
 967         function __construct() {
 968                 parent::__construct( 'Mypage' );
 969                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
 970                         'section', 'oldid', 'diff', 'dir' );
 971         }
 972
 973         function getRedirect( $subpage ) {
 974                 global $wgUser;
 975                 if ( strval( $subpage ) !== '' ) {
 976                         return Title::makeTitle( NS_USER, $wgUser->getName() . '/' . $subpage );
 977                 } else {
 978                         return Title::makeTitle( NS_USER, $wgUser->getName() );
 979                 }
 980         }
 981 }
 982
 983 /**
 984  * Shortcut to construct a special page pointing to current user talk page.
 985  * @ingroup SpecialPage
 986  */
 987 class SpecialMytalk extends UnlistedSpecialPage {
 988         function __construct() {
 989                 parent::__construct( 'Mytalk' );
 990                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
 991                         'section', 'oldid', 'diff', 'dir' );
 992         }
 993
 994         function getRedirect( $subpage ) {
 995                 global $wgUser;
 996                 if ( strval( $subpage ) !== '' ) {
 997                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() . '/' . $subpage );
 998                 } else {
 999                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() );
1000                 }
1001         }
1002 }
1003
1004 /**
1005  * Shortcut to construct a special page pointing to current user contributions.
1006  * @ingroup SpecialPage
1007  */
1008 class SpecialMycontributions extends UnlistedSpecialPage {
1009         function __construct() {
1010                 parent::__construct(  'Mycontributions' );
1011                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
1012                         'offset', 'dir', 'year', 'month', 'feed' );
1013         }
1014
1015         function getRedirect( $subpage ) {
1016                 global $wgUser;
1017                 return SpecialPage::getTitleFor( 'Contributions', $wgUser->getName() );
1018         }
1019 }