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