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         /**#@+
  33          * @access private
  34          */
  35         /**
  36          * The canonical name of this special page
  37          * Also used for the default <h1> heading, @see getDescription()
  38          */
  39         var $mName;
  40         /**
  41          * The local name of this special page
  42          */
  43         var $mLocalName;
  44         /**
  45          * Minimum user level required to access this page, or "" for anyone.
  46          * Also used to categorise the pages in Special:Specialpages
  47          */
  48         var $mRestriction;
  49         /**
  50          * Listed in Special:Specialpages?
  51          */
  52         var $mListed;
  53         /**
  54          * Function name called by the default execute()
  55          */
  56         var $mFunction;
  57         /**
  58          * File which needs to be included before the function above can be called
  59          */
  60         var $mFile;
  61         /**
  62          * Whether or not this special page is being included from an article
  63          */
  64         var $mIncluding;
  65         /**
  66          * Whether the special page can be included in an article
  67          */
  68         var $mIncludable;
  69         /**
  70          * Query parameters that can be passed through redirects
  71          */
  72         var $mAllowedRedirectParams = array();
  73         /**
  74          * List of special pages, followed by parameters.
  75          * If the only parameter is a string, that is the page name.
  76          * Otherwise, it is an array. The format is one of:
  77          ** array( 'SpecialPage', name, right )
  78          ** array( 'IncludableSpecialPage', name, right, listed? )
  79          ** array( 'UnlistedSpecialPage', name, right )
  80          ** array( 'SpecialRedirectToSpecial', name, page to redirect to, special page param, ... )
  81          */
  82         static public $mList = array(
  83                 # Maintenance Reports
  84                 'BrokenRedirects'           => array( 'SpecialPage', 'BrokenRedirects' ),
  85                 'Deadendpages'              => array( 'SpecialPage', 'Deadendpages' ),
  86                 'DoubleRedirects'           => array( 'SpecialPage', 'DoubleRedirects' ),
  87                 'Longpages'                 => array( 'SpecialPage', 'Longpages' ),
  88                 'Ancientpages'              => array( 'SpecialPage', 'Ancientpages' ),
  89                 'Lonelypages'               => array( 'SpecialPage', 'Lonelypages' ),
  90                 'Fewestrevisions'           => array( 'SpecialPage', 'Fewestrevisions' ),
  91                 'Withoutinterwiki'          => array( 'SpecialPage', 'Withoutinterwiki' ),
  92                 'Protectedpages'            => array( 'SpecialPage', 'Protectedpages' ),
  93                 'Protectedtitles'           => array( 'SpecialPage', 'Protectedtitles' ),
  94                 'Shortpages'                => array( 'SpecialPage', 'Shortpages' ),
  95                 'Uncategorizedcategories'   => array( 'SpecialPage', 'Uncategorizedcategories' ),
  96                 'Uncategorizedimages'       => array( 'SpecialPage', 'Uncategorizedimages' ),
  97                 'Uncategorizedpages'        => array( 'SpecialPage', 'Uncategorizedpages' ),
  98                 'Uncategorizedtemplates'    => array( 'SpecialPage', 'Uncategorizedtemplates' ),
  99                 'Unusedcategories'          => array( 'SpecialPage', 'Unusedcategories' ),
 100                 'Unusedimages'              => array( 'SpecialPage', 'Unusedimages' ),
 101                 'Unusedtemplates'           => array( 'SpecialPage', 'Unusedtemplates' ),
 102                 'Unwatchedpages'            => array( 'SpecialPage', 'Unwatchedpages', 'unwatchedpages' ),
 103                 'Wantedcategories'          => array( 'SpecialPage', 'Wantedcategories' ),
 104                 'Wantedfiles'               => array( 'SpecialPage', 'Wantedfiles' ),
 105                 'Wantedpages'               => array( 'IncludableSpecialPage', 'Wantedpages' ),
 106                 'Wantedtemplates'           => array( 'SpecialPage', 'Wantedtemplates' ),
 107
 108                 # List of pages
 109                 'Allpages'                  => 'SpecialAllpages',
 110                 'Prefixindex'               => 'SpecialPrefixindex',
 111                 'Categories'                => array( 'SpecialPage', 'Categories' ),
 112                 'Disambiguations'           => array( 'SpecialPage', 'Disambiguations' ),
 113                 'Listredirects'             => array( 'SpecialPage', 'Listredirects' ),
 114
 115                 # Login/create account
 116                 'Userlogin'                 => array( 'SpecialPage', 'Userlogin' ),
 117                 'CreateAccount'             => array( 'SpecialRedirectToSpecial', 'CreateAccount', 'Userlogin', 'signup', array( 'uselang' ) ),
 118
 119                 # Users and rights
 120                 'Blockip'                   => array( 'SpecialPage', 'Blockip', 'block' ),
 121                 'Ipblocklist'               => array( 'SpecialPage', 'Ipblocklist' ),
 122                 'Resetpass'                 => 'SpecialResetpass',
 123                 'DeletedContributions'      => 'DeletedContributionsPage',
 124                 'Preferences'               => array( 'SpecialPage', 'Preferences' ),
 125                 'Contributions'             => 'SpecialContributions',
 126                 'Listgrouprights'           => 'SpecialListGroupRights',
 127                 'Listusers'                 => array( 'SpecialPage', 'Listusers' ),
 128                 'Userrights'                => 'UserrightsPage',
 129
 130                 # Recent changes and logs
 131                 'Newimages'                 => array( 'IncludableSpecialPage', 'Newimages' ),
 132                 'Log'                       => array( 'SpecialPage', 'Log' ),
 133                 'Watchlist'                 => array( 'SpecialPage', 'Watchlist' ),
 134                 'Newpages'                  => 'SpecialNewpages',
 135                 'Recentchanges'             => 'SpecialRecentchanges',
 136                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 137                 'Tags'                      => 'SpecialTags',
 138
 139                 # Media reports and uploads
 140                 'Listfiles'                 => array( 'SpecialPage', 'Listfiles' ),
 141                 'Filepath'                  => array( 'SpecialPage', 'Filepath' ),
 142                 'MIMEsearch'                => array( 'SpecialPage', 'MIMEsearch' ),
 143                 'FileDuplicateSearch'       => array( 'SpecialPage', 'FileDuplicateSearch' ),
 144                 'Upload'                    => array( 'SpecialPage', 'Upload' ),
 145
 146                 # Wiki data and tools
 147                 'Statistics'                            => 'SpecialStatistics',
 148                 'Allmessages'               => array( 'SpecialPage', 'Allmessages' ),
 149                 'Version'                   => 'SpecialVersion',
 150                 'Lockdb'                    => array( 'SpecialPage', 'Lockdb', 'siteadmin' ),
 151                 'Unlockdb'                  => array( 'SpecialPage', 'Unlockdb', 'siteadmin' ),
 152
 153                 # Redirecting special pages
 154                 'LinkSearch'                => array( 'SpecialPage', 'LinkSearch' ),
 155                 'Randompage'                => 'Randompage',
 156                 'Randomredirect'            => 'SpecialRandomredirect',
 157
 158                 # High use pages
 159                 'Mostlinkedcategories'      => array( 'SpecialPage', 'Mostlinkedcategories' ),
 160                 'Mostimages'                => array( 'SpecialPage', 'Mostimages' ),
 161                 'Mostlinked'                => array( 'SpecialPage', 'Mostlinked' ),
 162                 'Mostlinkedtemplates'       => array( 'SpecialPage', 'Mostlinkedtemplates' ),
 163                 'Mostcategories'            => array( 'SpecialPage', 'Mostcategories' ),
 164                 'Mostrevisions'             => array( 'SpecialPage', 'Mostrevisions' ),
 165
 166                 # Page tools
 167                 'Export'                    => 'SpecialExport',
 168                 'Import'                    => 'SpecialImport',
 169                 'Undelete'                  => array( 'SpecialPage', 'Undelete', 'deletedhistory' ),
 170                 'Whatlinkshere'             => array( 'SpecialPage', 'Whatlinkshere' ),
 171                 'MergeHistory'              => array( 'SpecialPage', 'MergeHistory', 'mergehistory' ),
 172
 173                 # Other
 174                 'Booksources'               => 'SpecialBookSources',
 175
 176                 # Unlisted / redirects
 177                 'Blankpage'                 => array( 'UnlistedSpecialPage', 'Blankpage' ),
 178                 'Blockme'                   => array( 'UnlistedSpecialPage', 'Blockme' ),
 179                 'Emailuser'                 => array( 'UnlistedSpecialPage', 'Emailuser' ),
 180                 'Listadmins'                => array( 'SpecialRedirectToSpecial', 'Listadmins', 'Listusers', 'sysop' ),
 181                 'Listbots'                  => array( 'SpecialRedirectToSpecial', 'Listbots', 'Listusers', 'bot' ),
 182                 'Movepage'                  => array( 'UnlistedSpecialPage', 'Movepage' ),
 183                 'Mycontributions'           => array( 'SpecialMycontributions' ),
 184                 'Mypage'                    => array( 'SpecialMypage' ),
 185                 'Mytalk'                    => array( 'SpecialMytalk' ),
 186                 'Revisiondelete'            => 'SpecialRevisiondelete',
 187                 'Specialpages'              => array( 'UnlistedSpecialPage', 'Specialpages' ),
 188                 'Userlogout'                => array( 'UnlistedSpecialPage', 'Userlogout' ),
 189         );
 190
 191         static public $mAliases;
 192         static public $mListInitialised = false;
 193
 194         /**#@-*/
 195
 196         /**
 197          * Initialise the special page list
 198          * This must be called before accessing SpecialPage::$mList
 199          */
 200         static function initList() {
 201                 global $wgSpecialPages;
 202                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 203
 204                 if ( self::$mListInitialised ) {
 205                         return;
 206                 }
 207                 wfProfileIn( __METHOD__ );
 208
 209                 # Better to set this now, to avoid infinite recursion in carelessly written hooks
 210                 self::$mListInitialised = true;
 211
 212                 if( !$wgDisableCounters ) {
 213                         self::$mList['Popularpages'] = array( 'SpecialPage', 'Popularpages' );
 214                 }
 215
 216                 if( !$wgDisableInternalSearch ) {
 217                         self::$mList['Search'] = array( 'SpecialPage', 'Search' );
 218                 }
 219
 220                 if( $wgEmailAuthentication ) {
 221                         self::$mList['Confirmemail'] = 'EmailConfirmation';
 222                         self::$mList['Invalidateemail'] = 'EmailInvalidation';
 223                 }
 224
 225                 # Add extension special pages
 226                 self::$mList = array_merge( self::$mList, $wgSpecialPages );
 227
 228                 # Run hooks
 229                 # This hook can be used to remove undesired built-in special pages
 230                 wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 231                 wfProfileOut( __METHOD__ );
 232         }
 233
 234         static function initAliasList() {
 235                 if ( !is_null( self::$mAliases ) ) {
 236                         return;
 237                 }
 238
 239                 global $wgContLang;
 240                 $aliases = $wgContLang->getSpecialPageAliases();
 241                 $missingPages = self::$mList;
 242                 self::$mAliases = array();
 243                 foreach ( $aliases as $realName => $aliasList ) {
 244                         foreach ( $aliasList as $alias ) {
 245                                 self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 246                         }
 247                         unset( $missingPages[$realName] );
 248                 }
 249                 foreach ( $missingPages as $name => $stuff ) {
 250                         self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 251                 }
 252         }
 253
 254         /**
 255          * Given a special page alias, return the special page name.
 256          * Returns false if there is no such alias.
 257          */
 258         static function resolveAlias( $alias ) {
 259                 global $wgContLang;
 260
 261                 if ( !self::$mListInitialised ) self::initList();
 262                 if ( is_null( self::$mAliases ) ) self::initAliasList();
 263                 $caseFoldedAlias = $wgContLang->caseFold( $alias );
 264                 if ( isset( self::$mAliases[$caseFoldedAlias] ) ) {
 265                         return self::$mAliases[$caseFoldedAlias];
 266                 } else {
 267                         return false;
 268                 }
 269         }
 270
 271         /**
 272          * Given a special page name with a possible subpage, return an array
 273          * where the first element is the special page name and the second is the
 274          * subpage.
 275          */
 276         static function resolveAliasWithSubpage( $alias ) {
 277                 $bits = explode( '/', $alias, 2 );
 278                 $name = self::resolveAlias( $bits[0] );
 279                 if( !isset( $bits[1] ) ) { // bug 2087
 280                         $par = NULL;
 281                 } else {
 282                         $par = $bits[1];
 283                 }
 284                 return array( $name, $par );
 285         }
 286
 287         /**
 288          * Add a page to the list of valid special pages. This used to be the preferred
 289          * method for adding special pages in extensions. It's now suggested that you add
 290          * an associative record to $wgSpecialPages. This avoids autoloading SpecialPage.
 291          *
 292          * @param SpecialPage $page
 293          * @static
 294          */
 295         static function addPage( &$page ) {
 296                 if ( !self::$mListInitialised ) {
 297                         self::initList();
 298                 }
 299                 self::$mList[$page->mName] = $page;
 300         }
 301
 302         /**
 303          * Add a page to a certain display group for Special:SpecialPages
 304          *
 305          * @param mixed $page (SpecialPage or string)
 306          * @param string $group
 307          * @static
 308          */
 309         static function setGroup( $page, $group ) {
 310                 global $wgSpecialPageGroups;
 311                 $name = is_object($page) ? $page->mName : $page;
 312                 $wgSpecialPageGroups[$name] = $group;
 313         }
 314
 315         /**
 316          * Add a page to a certain display group for Special:SpecialPages
 317          *
 318          * @param SpecialPage $page
 319          * @static
 320          */
 321         static function getGroup( &$page ) {
 322                 global $wgSpecialPageGroups;
 323                 static $specialPageGroupsCache = array();
 324                 if( isset($specialPageGroupsCache[$page->mName]) ) {
 325                         return $specialPageGroupsCache[$page->mName];
 326                 }
 327                 $group = wfMsg('specialpages-specialpagegroup-'.strtolower($page->mName));
 328                 if( $group == ''
 329                  || wfEmptyMsg('specialpages-specialpagegroup-'.strtolower($page->mName), $group ) ) {
 330                         $group = isset($wgSpecialPageGroups[$page->mName])
 331                                 ? $wgSpecialPageGroups[$page->mName]
 332                                 : '-';
 333                 }
 334                 if( $group == '-' ) $group = 'other';
 335                 $specialPageGroupsCache[$page->mName] = $group;
 336                 return $group;
 337         }
 338
 339         /**
 340          * Remove a special page from the list
 341          * Formerly used to disable expensive or dangerous special pages. The
 342          * preferred method is now to add a SpecialPage_initList hook.
 343          *
 344          * @static
 345          */
 346         static function removePage( $name ) {
 347                 if ( !self::$mListInitialised ) {
 348                         self::initList();
 349                 }
 350                 unset( self::$mList[$name] );
 351         }
 352
 353         /**
 354          * Check if a given name exist as a special page or as a special page alias
 355          * @param $name string: name of a special page
 356          * @return boolean: true if a special page exists with this name
 357          */
 358         static function exists( $name ) {
 359                 global $wgContLang;
 360                 if ( !self::$mListInitialised ) {
 361                         self::initList();
 362                 }
 363                 if( !self::$mAliases ) {
 364                         self::initAliasList();
 365                 }
 366
 367                 # Remove special pages inline parameters:
 368                 $bits = explode( '/', $name );
 369                 $name = $wgContLang->caseFold($bits[0]);
 370
 371                 return
 372                         array_key_exists( $name, self::$mList )
 373                         or array_key_exists( $name, self::$mAliases )
 374                 ;
 375         }
 376
 377         /**
 378          * Find the object with a given name and return it (or NULL)
 379          * @static
 380          * @param string $name
 381          */
 382         static function getPage( $name ) {
 383                 if ( !self::$mListInitialised ) {
 384                         self::initList();
 385                 }
 386                 if ( array_key_exists( $name, self::$mList ) ) {
 387                         $rec = self::$mList[$name];
 388                         if ( is_string( $rec ) ) {
 389                                 $className = $rec;
 390                                 self::$mList[$name] = new $className;
 391                         } elseif ( is_array( $rec ) ) {
 392                                 $className = array_shift( $rec );
 393                                 self::$mList[$name] = wfCreateObject( $className, $rec );
 394                         }
 395                         return self::$mList[$name];
 396                 } else {
 397                         return NULL;
 398                 }
 399         }
 400
 401         /**
 402          * Get a special page with a given localised name, or NULL if there
 403          * is no such special page.
 404          */
 405         static function getPageByAlias( $alias ) {
 406                 $realName = self::resolveAlias( $alias );
 407                 if ( $realName ) {
 408                         return self::getPage( $realName );
 409                 } else {
 410                         return NULL;
 411                 }
 412         }
 413
 414         /**
 415          * Return categorised listable special pages which are available
 416          * for the current user, and everyone.
 417          * @static
 418          */
 419         static function getUsablePages() {
 420                 global $wgUser;
 421                 if ( !self::$mListInitialised ) {
 422                         self::initList();
 423                 }
 424                 $pages = array();
 425
 426                 foreach ( self::$mList as $name => $rec ) {
 427                         $page = self::getPage( $name );
 428                         if ( $page->isListed()
 429                                 && (
 430                                         !$page->isRestricted()
 431                                         || $page->userCanExecute( $wgUser )
 432                                 )
 433                         ) {
 434                                 $pages[$name] = $page;
 435                         }
 436                 }
 437                 return $pages;
 438         }
 439
 440         /**
 441          * Return categorised listable special pages for all users
 442          * @static
 443          */
 444         static function getRegularPages() {
 445                 if ( !self::$mListInitialised ) {
 446                         self::initList();
 447                 }
 448                 $pages = array();
 449
 450                 foreach ( self::$mList as $name => $rec ) {
 451                         $page = self::getPage( $name );
 452                         if ( $page->isListed() && !$page->isRestricted() ) {
 453                                 $pages[$name] = $page;
 454                         }
 455                 }
 456                 return $pages;
 457         }
 458
 459         /**
 460          * Return categorised listable special pages which are available
 461          * for the current user, but not for everyone
 462          * @static
 463          */
 464         static function getRestrictedPages() {
 465                 global $wgUser;
 466                 if( !self::$mListInitialised ) {
 467                         self::initList();
 468                 }
 469                 $pages = array();
 470
 471                 foreach( self::$mList as $name => $rec ) {
 472                         $page = self::getPage( $name );
 473                         if(
 474                                 $page->isListed()
 475                                 && $page->isRestricted()
 476                                 && $page->userCanExecute( $wgUser )
 477                         ) {
 478                                 $pages[$name] = $page;
 479                         }
 480                 }
 481                 return $pages;
 482         }
 483
 484         /**
 485          * Execute a special page path.
 486          * The path     may contain parameters, e.g. Special:Name/Params
 487          * Extracts the special page name and call the execute method, passing the parameters
 488          *
 489          * Returns a title object if the page is redirected, false if there was no such special
 490          * page, and true if it was successful.
 491          *
 492          * @param $title          a title object
 493          * @param $including      output is being captured for use in {{special:whatever}}
 494          */
 495         static function executePath( &$title, $including = false ) {
 496                 global $wgOut, $wgTitle, $wgRequest;
 497                 wfProfileIn( __METHOD__ );
 498
 499                 # FIXME: redirects broken due to this call
 500                 $bits = explode( '/', $title->getDBkey(), 2 );
 501                 $name = $bits[0];
 502                 if( !isset( $bits[1] ) ) { // bug 2087
 503                         $par = NULL;
 504                 } else {
 505                         $par = $bits[1];
 506                 }
 507                 $page = SpecialPage::getPageByAlias( $name );
 508                 # Nonexistent?
 509                 if ( !$page ) {
 510                         if ( !$including ) {
 511                                 $wgOut->setArticleRelated( false );
 512                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 513                                 $wgOut->setStatusCode( 404 );
 514                                 $wgOut->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 515                         }
 516                         wfProfileOut( __METHOD__ );
 517                         return false;
 518                 }
 519
 520                 # Check for redirect
 521                 if ( !$including ) {
 522                         $redirect = $page->getRedirect( $par );
 523                         if ( $redirect ) {
 524                                 $query = $page->getRedirectQuery();
 525                                 $url = $redirect->getFullUrl( $query );
 526                                 $wgOut->redirect( $url );
 527                                 wfProfileOut( __METHOD__ );
 528                                 return $redirect;
 529                         }
 530                 }
 531
 532                 # Redirect to canonical alias for GET commands
 533                 # Not for POST, we'd lose the post data, so it's best to just distribute
 534                 # the request. Such POST requests are possible for old extensions that
 535                 # generate self-links without being aware that their default name has
 536                 # changed.
 537                 if ( !$including && $name != $page->getLocalName() && !$wgRequest->wasPosted() ) {
 538                         $query = $_GET;
 539                         unset( $query['title'] );
 540                         $query = wfArrayToCGI( $query );
 541                         $title = $page->getTitle( $par );
 542                         $url = $title->getFullUrl( $query );
 543                         $wgOut->redirect( $url );
 544                         wfProfileOut( __METHOD__ );
 545                         return $redirect;
 546                 }
 547
 548                 if ( $including && !$page->includable() ) {
 549                         wfProfileOut( __METHOD__ );
 550                         return false;
 551                 } elseif ( !$including ) {
 552                         $wgTitle = $page->getTitle();
 553                 }
 554                 $page->including( $including );
 555
 556                 // Execute special page
 557                 $profName = 'Special:' . $page->getName();
 558                 wfProfileIn( $profName );
 559                 $page->execute( $par );
 560                 wfProfileOut( $profName );
 561                 wfProfileOut( __METHOD__ );
 562                 return true;
 563         }
 564
 565         /**
 566          * Just like executePath() except it returns the HTML instead of outputting it
 567          * Returns false if there was no such special page, or a title object if it was
 568          * a redirect.
 569          * @static
 570          */
 571         static function capturePath( &$title ) {
 572                 global $wgOut, $wgTitle;
 573
 574                 $oldTitle = $wgTitle;
 575                 $oldOut = $wgOut;
 576                 $wgOut = new OutputPage;
 577
 578                 $ret = SpecialPage::executePath( $title, true );
 579                 if ( $ret === true ) {
 580                         $ret = $wgOut->getHTML();
 581                 }
 582                 $wgTitle = $oldTitle;
 583                 $wgOut = $oldOut;
 584                 return $ret;
 585         }
 586
 587         /**
 588          * Get the local name for a specified canonical name
 589          *
 590          * @param $name
 591          * @param mixed $subpage Boolean false, or string
 592          *
 593          * @return string
 594          */
 595         static function getLocalNameFor( $name, $subpage = false ) {
 596                 global $wgContLang;
 597                 $aliases = $wgContLang->getSpecialPageAliases();
 598                 if ( isset( $aliases[$name][0] ) ) {
 599                         $name = $aliases[$name][0];
 600                 }
 601                 if ( $subpage !== false && !is_null( $subpage ) ) {
 602                         $name = "$name/$subpage";
 603                 }
 604                 return ucfirst( $name );
 605         }
 606
 607         /**
 608          * Get a localised Title object for a specified special page name
 609          */
 610         static function getTitleFor( $name, $subpage = false ) {
 611                 $name = self::getLocalNameFor( $name, $subpage );
 612                 if ( $name ) {
 613                         return Title::makeTitle( NS_SPECIAL, $name );
 614                 } else {
 615                         throw new MWException( "Invalid special page name \"$name\"" );
 616                 }
 617         }
 618
 619         /**
 620          * Get a localised Title object for a page name with a possibly unvalidated subpage
 621          */
 622         static function getSafeTitleFor( $name, $subpage = false ) {
 623                 $name = self::getLocalNameFor( $name, $subpage );
 624                 if ( $name ) {
 625                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 626                 } else {
 627                         return null;
 628                 }
 629         }
 630
 631         /**
 632          * Get a title for a given alias
 633          * @return Title or null if there is no such alias
 634          */
 635         static function getTitleForAlias( $alias ) {
 636                 $name = self::resolveAlias( $alias );
 637                 if ( $name ) {
 638                         return self::getTitleFor( $name );
 639                 } else {
 640                         return null;
 641                 }
 642         }
 643
 644         /**
 645          * Default constructor for special pages
 646          * Derivative classes should call this from their constructor
 647          *     Note that if the user does not have the required level, an error message will
 648          *     be displayed by the default execute() method, without the global function ever
 649          *     being called.
 650          *
 651          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 652          *     and displayRestrictionError()
 653          *
 654          * @param string $name Name of the special page, as seen in links and URLs
 655          * @param string $restriction User right required, e.g. "block" or "delete"
 656          * @param boolean $listed Whether the page is listed in Special:Specialpages
 657          * @param string $function Function called by execute(). By default it is constructed from $name
 658          * @param string $file File which is included by execute(). It is also constructed from $name by default
 659          */
 660         function SpecialPage( $name = '', $restriction = '', $listed = true, $function = false, $file = 'default', $includable = false ) {
 661                 $this->mName = $name;
 662                 $this->mRestriction = $restriction;
 663                 $this->mListed = $listed;
 664                 $this->mIncludable = $includable;
 665                 if ( $function == false ) {
 666                         $this->mFunction = 'wfSpecial'.$name;
 667                 } else {
 668                         $this->mFunction = $function;
 669                 }
 670                 if ( $file === 'default' ) {
 671                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 672                 } else {
 673                         $this->mFile = $file;
 674                 }
 675         }
 676
 677         /**#@+
 678           * Accessor
 679           *
 680           * @deprecated
 681           */
 682         function getName() { return $this->mName; }
 683         function getRestriction() { return $this->mRestriction; }
 684         function getFile() { return $this->mFile; }
 685         function isListed() { return $this->mListed; }
 686         /**#@-*/
 687
 688         /**#@+
 689           * Accessor and mutator
 690           */
 691         function name( $x = NULL ) { return wfSetVar( $this->mName, $x ); }
 692         function restrictions( $x = NULL) { return wfSetVar( $this->mRestrictions, $x ); }
 693         function listed( $x = NULL) { return wfSetVar( $this->mListed, $x ); }
 694         function func( $x = NULL) { return wfSetVar( $this->mFunction, $x ); }
 695         function file( $x = NULL) { return wfSetVar( $this->mFile, $x ); }
 696         function includable( $x = NULL ) { return wfSetVar( $this->mIncludable, $x ); }
 697         function including( $x = NULL ) { return wfSetVar( $this->mIncluding, $x ); }
 698         /**#@-*/
 699
 700         /**
 701          * Get the localised name of the special page
 702          */
 703         function getLocalName() {
 704                 if ( !isset( $this->mLocalName ) ) {
 705                         $this->mLocalName = self::getLocalNameFor( $this->mName );
 706                 }
 707                 return $this->mLocalName;
 708         }
 709
 710         /**
 711          * Can be overridden by subclasses with more complicated permissions
 712          * schemes.
 713          *
 714          * @return bool Should the page be displayed with the restricted-access
 715          *   pages?
 716          */
 717         public function isRestricted() {
 718                 return $this->mRestriction != '';
 719         }
 720
 721         /**
 722          * Checks if the given user (identified by an object) can execute this
 723          * special page (as defined by $mRestriction).  Can be overridden by sub-
 724          * classes with more complicated permissions schemes.
 725          *
 726          * @param User $user The user to check
 727          * @return bool Does the user have permission to view the page?
 728          */
 729         public function userCanExecute( $user ) {
 730                 return $user->isAllowed( $this->mRestriction );
 731         }
 732
 733         /**
 734          * Output an error message telling the user what access level they have to have
 735          */
 736         function displayRestrictionError() {
 737                 global $wgOut;
 738                 $wgOut->permissionRequired( $this->mRestriction );
 739         }
 740
 741         /**
 742          * Sets headers - this should be called from the execute() method of all derived classes!
 743          */
 744         function setHeaders() {
 745                 global $wgOut;
 746                 $wgOut->setArticleRelated( false );
 747                 $wgOut->setRobotPolicy( "noindex,nofollow" );
 748                 $wgOut->setPageTitle( $this->getDescription() );
 749         }
 750
 751         /**
 752          * Default execute method
 753          * Checks user permissions, calls the function given in mFunction
 754          *
 755          * This may be overridden by subclasses.
 756          */
 757         function execute( $par ) {
 758                 global $wgUser;
 759
 760                 $this->setHeaders();
 761
 762                 if ( $this->userCanExecute( $wgUser ) ) {
 763                         $func = $this->mFunction;
 764                         // only load file if the function does not exist
 765                         if(!is_callable($func) and $this->mFile) {
 766                                 require_once( $this->mFile );
 767                         }
 768                         $this->outputHeader();
 769                         call_user_func( $func, $par, $this );
 770                 } else {
 771                         $this->displayRestrictionError();
 772                 }
 773         }
 774
 775         /**
 776          * Outputs a summary message on top of special pages
 777          * Per default the message key is the canonical name of the special page
 778          * May be overriden, i.e. by extensions to stick with the naming conventions
 779          * for message keys: 'extensionname-xxx'
 780          *
 781          * @param string message key of the summary
 782          */
 783         function outputHeader( $summaryMessageKey = '' ) {
 784                 global $wgOut, $wgContLang;
 785
 786                 if( $summaryMessageKey == '' ) {
 787                         $msg = $wgContLang->lc( $this->name() ) . '-summary';
 788                 } else {
 789                         $msg = $summaryMessageKey;
 790                 }
 791                 $out = wfMsgNoTrans( $msg );
 792                 if ( ! wfEmptyMsg( $msg, $out ) and  $out !== '' and ! $this->including() ) {
 793                         $wgOut->wrapWikiMsg( "<div class='mw-specialpage-summary'>\n$1</div>", $msg );
 794                 }
 795
 796         }
 797
 798         # Returns the name that goes in the <h1> in the special page itself, and also the name that
 799         # will be listed in Special:Specialpages
 800         #
 801         # Derived classes can override this, but usually it is easier to keep the default behaviour.
 802         # Messages can be added at run-time, see MessageCache.php
 803         function getDescription() {
 804                 return wfMsg( strtolower( $this->mName ) );
 805         }
 806
 807         /**
 808          * Get a self-referential title object
 809          */
 810         function getTitle( $subpage = false) {
 811                 return self::getTitleFor( $this->mName, $subpage );
 812         }
 813
 814         /**
 815          * Set whether this page is listed in Special:Specialpages, at run-time
 816          */
 817         function setListed( $listed ) {
 818                 return wfSetVar( $this->mListed, $listed );
 819         }
 820
 821         /**
 822          * If the special page is a redirect, then get the Title object it redirects to.
 823          * False otherwise.
 824          */
 825         function getRedirect( $subpage ) {
 826                 return false;
 827         }
 828
 829         /**
 830          * Return part of the request string for a special redirect page
 831          * This allows passing, e.g. action=history to Special:Mypage, etc.
 832          *
 833          * @return string
 834          */
 835         function getRedirectQuery() {
 836                 global $wgRequest;
 837                 $params = array();
 838                 foreach( $this->mAllowedRedirectParams as $arg ) {
 839                         if( $val = $wgRequest->getVal( $arg, false ) )
 840                                 $params[] = $arg . '=' . $val;
 841                 }
 842
 843                 return count( $params ) ? implode( '&', $params ) : false;
 844         }
 845 }
 846
 847 /**
 848  * Shortcut to construct a special page which is unlisted by default
 849  * @ingroup SpecialPage
 850  */
 851 class UnlistedSpecialPage extends SpecialPage
 852 {
 853         function UnlistedSpecialPage( $name, $restriction = '', $function = false, $file = 'default' ) {
 854                 SpecialPage::SpecialPage( $name, $restriction, false, $function, $file );
 855         }
 856 }
 857
 858 /**
 859  * Shortcut to construct an includable special  page
 860  * @ingroup SpecialPage
 861  */
 862 class IncludableSpecialPage extends SpecialPage
 863 {
 864         function IncludableSpecialPage( $name, $restriction = '', $listed = true, $function = false, $file = 'default' ) {
 865                 SpecialPage::SpecialPage( $name, $restriction, $listed, $function, $file, true );
 866         }
 867 }
 868
 869 /**
 870  * Shortcut to construct a special page alias.
 871  * @ingroup SpecialPage
 872  */
 873 class SpecialRedirectToSpecial extends UnlistedSpecialPage {
 874         var $redirName, $redirSubpage;
 875
 876         function __construct( $name, $redirName, $redirSubpage = false, $redirectParams = array() ) {
 877                 parent::__construct( $name );
 878                 $this->redirName = $redirName;
 879                 $this->redirSubpage = $redirSubpage;
 880                 $this->mAllowedRedirectParams = $redirectParams;
 881         }
 882
 883         function getRedirect( $subpage ) {
 884                 if ( $this->redirSubpage === false ) {
 885                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
 886                 } else {
 887                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
 888                 }
 889         }
 890 }
 891
 892 /** SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
 893  * are used to get user independant links pointing to the user page, talk
 894  * page and list of contributions.
 895  * This can let us cache a single copy of any generated content for all
 896  * users.
 897  */
 898
 899 /**
 900  * Shortcut to construct a special page pointing to current user user's page.
 901  * @ingroup SpecialPage
 902  */
 903 class SpecialMypage extends UnlistedSpecialPage {
 904         function __construct() {
 905                 parent::__construct( 'Mypage' );
 906                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro', 'section' );
 907         }
 908
 909         function getRedirect( $subpage ) {
 910                 global $wgUser;
 911                 if ( strval( $subpage ) !== '' ) {
 912                         return Title::makeTitle( NS_USER, $wgUser->getName() . '/' . $subpage );
 913                 } else {
 914                         return Title::makeTitle( NS_USER, $wgUser->getName() );
 915                 }
 916         }
 917 }
 918
 919 /**
 920  * Shortcut to construct a special page pointing to current user talk page.
 921  * @ingroup SpecialPage
 922  */
 923 class SpecialMytalk extends UnlistedSpecialPage {
 924         function __construct() {
 925                 parent::__construct( 'Mytalk' );
 926                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro', 'section' );
 927         }
 928
 929         function getRedirect( $subpage ) {
 930                 global $wgUser;
 931                 if ( strval( $subpage ) !== '' ) {
 932                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() . '/' . $subpage );
 933                 } else {
 934                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() );
 935                 }
 936         }
 937 }
 938
 939 /**
 940  * Shortcut to construct a special page pointing to current user contributions.
 941  * @ingroup SpecialPage
 942  */
 943 class SpecialMycontributions extends UnlistedSpecialPage {
 944         function __construct() {
 945                 parent::__construct(  'Mycontributions' );
 946         }
 947
 948         function getRedirect( $subpage ) {
 949                 global $wgUser;
 950                 return SpecialPage::getTitleFor( 'Contributions', $wgUser->getName() );
 951         }
 952 }