includes/SpecialPageFactory.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  * Factory for handling the special page list and generating SpecialPage objects
  27  * @ingroup SpecialPage
  28  * @since 1.17
  29  */
  30 class SpecialPageFactory {
  31
  32         /**
  33          * List of special page names to the subclass of SpecialPage which handles them.
  34          */
  35         private static $mList = array(
  36                 // Maintenance Reports
  37                 'BrokenRedirects'           => 'BrokenRedirectsPage',
  38                 'Deadendpages'              => 'DeadendpagesPage',
  39                 'DoubleRedirects'           => 'DoubleRedirectsPage',
  40                 'Longpages'                 => 'LongpagesPage',
  41                 'Ancientpages'              => 'AncientpagesPage',
  42                 'Lonelypages'               => 'LonelypagesPage',
  43                 'Fewestrevisions'           => 'FewestrevisionsPage',
  44                 'Withoutinterwiki'          => 'WithoutinterwikiPage',
  45                 'Protectedpages'            => 'SpecialProtectedpages',
  46                 'Protectedtitles'           => 'SpecialProtectedtitles',
  47                 'Shortpages'                => 'ShortpagesPage',
  48                 'Uncategorizedcategories'   => 'UncategorizedcategoriesPage',
  49                 'Uncategorizedimages'       => 'UncategorizedimagesPage',
  50                 'Uncategorizedpages'        => 'UncategorizedpagesPage',
  51                 'Uncategorizedtemplates'    => 'UncategorizedtemplatesPage',
  52                 'Unusedcategories'          => 'UnusedcategoriesPage',
  53                 'Unusedimages'              => 'UnusedimagesPage',
  54                 'Unusedtemplates'           => 'UnusedtemplatesPage',
  55                 'Unwatchedpages'            => 'UnwatchedpagesPage',
  56                 'Wantedcategories'          => 'WantedcategoriesPage',
  57                 'Wantedfiles'               => 'WantedfilesPage',
  58                 'Wantedpages'               => 'WantedpagesPage',
  59                 'Wantedtemplates'           => 'WantedtemplatesPage',
  60
  61                 // List of pages
  62                 'Allpages'                  => 'SpecialAllpages',
  63                 'Prefixindex'               => 'SpecialPrefixindex',
  64                 'Categories'                => 'SpecialCategories',
  65                 'Disambiguations'           => 'DisambiguationsPage',
  66                 'Listredirects'             => 'ListredirectsPage',
  67
  68                 // Login/create account
  69                 'Userlogin'                 => 'LoginForm',
  70                 'CreateAccount'             => 'SpecialCreateAccount',
  71
  72                 // Users and rights
  73                 'Block'                     => 'SpecialBlock',
  74                 'Unblock'                   => 'SpecialUnblock',
  75                 'BlockList'                 => 'SpecialBlockList',
  76                 'ChangePassword'            => 'SpecialChangePassword',
  77                 'PasswordReset'             => 'SpecialPasswordReset',
  78                 'DeletedContributions'      => 'DeletedContributionsPage',
  79                 'Preferences'               => 'SpecialPreferences',
  80                 'Contributions'             => 'SpecialContributions',
  81                 'Listgrouprights'           => 'SpecialListGroupRights',
  82                 'Listusers'                 => 'SpecialListUsers' ,
  83                 'Listadmins'                => 'SpecialListAdmins',
  84                 'Listbots'                  => 'SpecialListBots',
  85                 'Activeusers'               => 'SpecialActiveUsers',
  86                 'Userrights'                => 'UserrightsPage',
  87                 'EditWatchlist'             => 'SpecialEditWatchlist',
  88
  89                 // Recent changes and logs
  90                 'Newimages'                 => 'SpecialNewFiles',
  91                 'Log'                       => 'SpecialLog',
  92                 'Watchlist'                 => 'SpecialWatchlist',
  93                 'Newpages'                  => 'SpecialNewpages',
  94                 'Recentchanges'             => 'SpecialRecentchanges',
  95                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
  96                 'Tags'                      => 'SpecialTags',
  97
  98                 // Media reports and uploads
  99                 'Listfiles'                 => 'SpecialListFiles',
 100                 'Filepath'                  => 'SpecialFilepath',
 101                 'MIMEsearch'                => 'MIMEsearchPage',
 102                 'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
 103                 'Upload'                    => 'SpecialUpload',
 104                 'UploadStash'               => 'SpecialUploadStash',
 105
 106                 // Wiki data and tools
 107                 'Statistics'                => 'SpecialStatistics',
 108                 'Allmessages'               => 'SpecialAllmessages',
 109                 'Version'                   => 'SpecialVersion',
 110                 'Lockdb'                    => 'SpecialLockdb',
 111                 'Unlockdb'                  => 'SpecialUnlockdb',
 112
 113                 // Redirecting special pages
 114                 'LinkSearch'                => 'LinkSearchPage',
 115                 'Randompage'                => 'Randompage',
 116                 'Randomredirect'            => 'SpecialRandomredirect',
 117
 118                 // High use pages
 119                 'Mostlinkedcategories'      => 'MostlinkedCategoriesPage',
 120                 'Mostimages'                => 'MostimagesPage',
 121                 'Mostlinked'                => 'MostlinkedPage',
 122                 'Mostlinkedtemplates'       => 'MostlinkedTemplatesPage',
 123                 'Mostcategories'            => 'MostcategoriesPage',
 124                 'Mostrevisions'             => 'MostrevisionsPage',
 125
 126                 // Page tools
 127                 'ComparePages'              => 'SpecialComparePages',
 128                 'Export'                    => 'SpecialExport',
 129                 'GlobalFileUsage'           => 'SpecialGlobalFileUsage',
 130                 'GlobalTemplateUsage'       => 'SpecialGlobalTemplateUsage',
 131                 'Import'                    => 'SpecialImport',
 132                 'Undelete'                  => 'SpecialUndelete',
 133                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 134                 'MergeHistory'              => 'SpecialMergeHistory',
 135
 136                 // Other
 137                 'Booksources'               => 'SpecialBookSources',
 138
 139                 // Unlisted / redirects
 140                 'Blankpage'                 => 'SpecialBlankpage',
 141                 'Blockme'                   => 'SpecialBlockme',
 142                 'Emailuser'                 => 'SpecialEmailUser',
 143                 'Movepage'                  => 'MovePageForm',
 144                 'Mycontributions'           => 'SpecialMycontributions',
 145                 'Mypage'                    => 'SpecialMypage',
 146                 'Mytalk'                    => 'SpecialMytalk',
 147                 'Myuploads'                 => 'SpecialMyuploads',
 148                 'PermanentLink'             => 'SpecialPermanentLink',
 149                 'Revisiondelete'            => 'SpecialRevisionDelete',
 150                 'Specialpages'              => 'SpecialSpecialpages',
 151                 'Userlogout'                => 'SpecialUserlogout',
 152         );
 153
 154         private static $mAliases;
 155
 156         /**
 157          * Initialise the special page list
 158          * This must be called before accessing SpecialPage::$mList
 159          *
 160          * @return array
 161          */
 162         static function getList() {
 163                 global $wgSpecialPages;
 164                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 165                 global $wgEnableEmail;
 166
 167                 if ( !is_object( self::$mList ) ) {
 168                         wfProfileIn( __METHOD__ );
 169
 170                         if ( !$wgDisableCounters ) {
 171                                 self::$mList['Popularpages'] = 'PopularpagesPage';
 172                         }
 173
 174                         if ( !$wgDisableInternalSearch ) {
 175                                 self::$mList['Search'] = 'SpecialSearch';
 176                         }
 177
 178                         if ( $wgEmailAuthentication ) {
 179                                 self::$mList['Confirmemail'] = 'EmailConfirmation';
 180                                 self::$mList['Invalidateemail'] = 'EmailInvalidation';
 181                         }
 182
 183                         if ( $wgEnableEmail ) {
 184                                 self::$mList['ChangeEmail'] = 'SpecialChangeEmail';
 185                         }
 186
 187                         // Add extension special pages
 188                         self::$mList = array_merge( self::$mList, $wgSpecialPages );
 189
 190                         // Run hooks
 191                         // This hook can be used to remove undesired built-in special pages
 192                         wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 193
 194                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 195                         settype( self::$mList, 'object' );
 196
 197                         wfProfileOut( __METHOD__ );
 198                 }
 199                 return self::$mList;
 200         }
 201
 202         /**
 203          * Initialise and return the list of special page aliases.  Returns an object with
 204          * properties which can be accessed $obj->pagename - each property is an array of
 205          * aliases; the first in the array is the cannonical alias.  All registered special
 206          * pages are guaranteed to have a property entry, and for that property array to
 207          * contain at least one entry (English fallbacks will be added if necessary).
 208          * @return Object
 209          */
 210         static function getAliasList() {
 211                 if ( !is_object( self::$mAliases ) ) {
 212                         global $wgContLang;
 213                         $aliases = $wgContLang->getSpecialPageAliases();
 214
 215                         // Objects are passed by reference by default, need to create a copy
 216                         $missingPages = clone self::getList();
 217
 218                         self::$mAliases = array();
 219                         foreach ( $aliases as $realName => $aliasList ) {
 220                                 foreach ( $aliasList as $alias ) {
 221                                         self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 222                                 }
 223                                 unset( $missingPages->$realName );
 224                         }
 225                         foreach ( $missingPages as $name => $stuff ) {
 226                                 self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 227                         }
 228
 229                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 230                         self::$mAliases = (object)self::$mAliases;
 231                 }
 232                 return self::$mAliases;
 233         }
 234
 235         /**
 236          * Given a special page name with a possible subpage, return an array
 237          * where the first element is the special page name and the second is the
 238          * subpage.
 239          *
 240          * @param $alias String
 241          * @return Array( String, String|null ), or array( null, null ) if the page is invalid
 242          */
 243         public static function resolveAlias( $alias ) {
 244                 global $wgContLang;
 245                 $bits = explode( '/', $alias, 2 );
 246
 247                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 248                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 249                 if ( isset( self::getAliasList()->$caseFoldedAlias ) ) {
 250                         $name = self::getAliasList()->$caseFoldedAlias;
 251                 } else {
 252                         return array( null, null );
 253                 }
 254
 255                 if ( !isset( $bits[1] ) ) { // bug 2087
 256                         $par = null;
 257                 } else {
 258                         $par = $bits[1];
 259                 }
 260
 261                 return array( $name, $par );
 262         }
 263
 264         /**
 265          * Add a page to a certain display group for Special:SpecialPages
 266          *
 267          * @param $page Mixed: SpecialPage or string
 268          * @param $group String
 269          */
 270         public static function setGroup( $page, $group ) {
 271                 global $wgSpecialPageGroups;
 272                 $name = is_object( $page ) ? $page->getName() : $page;
 273                 $wgSpecialPageGroups[$name] = $group;
 274         }
 275
 276         /**
 277          * Get the group that the special page belongs in on Special:SpecialPage
 278          *
 279          * @param $page SpecialPage
 280          */
 281         public static function getGroup( &$page ) {
 282                 $name = $page->getName();
 283
 284                 global $wgSpecialPageGroups;
 285                 static $specialPageGroupsCache = array();
 286                 if ( isset( $specialPageGroupsCache[$name] ) ) {
 287                         return $specialPageGroupsCache[$name];
 288                 }
 289                 $msg = wfMessage( 'specialpages-specialpagegroup-' . strtolower( $name ) );
 290                 if ( !$msg->isBlank() ) {
 291                         $group = $msg->text();
 292                 } else {
 293                         $group = isset( $wgSpecialPageGroups[$name] )
 294                                 ? $wgSpecialPageGroups[$name]
 295                                 : '-';
 296                 }
 297                 if ( $group == '-' ) {
 298                         $group = 'other';
 299                 }
 300                 $specialPageGroupsCache[$name] = $group;
 301                 return $group;
 302         }
 303
 304         /**
 305          * Check if a given name exist as a special page or as a special page alias
 306          *
 307          * @param $name String: name of a special page
 308          * @return Boolean: true if a special page exists with this name
 309          */
 310         public static function exists( $name ) {
 311                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 312                 return property_exists( self::getList(), $title );
 313         }
 314
 315         /**
 316          * Find the object with a given name and return it (or NULL)
 317          *
 318          * @param $name String Special page name, may be localised and/or an alias
 319          * @return SpecialPage object or null if the page doesn't exist
 320          */
 321         public static function getPage( $name ) {
 322                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 323                 if ( property_exists( self::getList(), $realName ) ) {
 324                         $rec = self::getList()->$realName;
 325                         if ( is_string( $rec ) ) {
 326                                 $className = $rec;
 327                                 return new $className;
 328                         } elseif ( is_array( $rec ) ) {
 329                                 // @deprecated, officially since 1.18, unofficially since forever
 330                                 wfDebug( "Array syntax for \$wgSpecialPages is deprecated, define a subclass of SpecialPage instead." );
 331                                 $className = array_shift( $rec );
 332                                 self::getList()->$realName = MWFunction::newObj( $className, $rec );
 333                         }
 334                         return self::getList()->$realName;
 335                 } else {
 336                         return null;
 337                 }
 338         }
 339
 340         /**
 341          * Return categorised listable special pages which are available
 342          * for the current user, and everyone.
 343          *
 344          * @return Array( String => Specialpage )
 345          */
 346         public static function getUsablePages() {
 347                 global $wgUser;
 348                 $pages = array();
 349                 foreach ( self::getList() as $name => $rec ) {
 350                         $page = self::getPage( $name );
 351                         if ( $page->isListed()
 352                                 && (
 353                                         !$page->isRestricted()
 354                                         || $page->userCanExecute( $wgUser )
 355                                 )
 356                         ) {
 357                                 $pages[$name] = $page;
 358                         }
 359                 }
 360                 return $pages;
 361         }
 362
 363         /**
 364          * Return categorised listable special pages for all users
 365          *
 366          * @return Array( String => Specialpage )
 367          */
 368         public static function getRegularPages() {
 369                 $pages = array();
 370                 foreach ( self::getList() as $name => $rec ) {
 371                         $page = self::getPage( $name );
 372                         if ( $page->isListed() && !$page->isRestricted() ) {
 373                                 $pages[$name] = $page;
 374                         }
 375                 }
 376                 return $pages;
 377         }
 378
 379         /**
 380          * Return categorised listable special pages which are available
 381          * for the current user, but not for everyone
 382          *
 383          * @return Array( String => Specialpage )
 384          */
 385         public static function getRestrictedPages() {
 386                 global $wgUser;
 387                 $pages = array();
 388                 foreach ( self::getList() as $name => $rec ) {
 389                         $page = self::getPage( $name );
 390                         if (
 391                                 $page->isListed()
 392                                 && $page->isRestricted()
 393                                 && $page->userCanExecute( $wgUser )
 394                         ) {
 395                                 $pages[$name] = $page;
 396                         }
 397                 }
 398                 return $pages;
 399         }
 400
 401         /**
 402          * Execute a special page path.
 403          * The path may contain parameters, e.g. Special:Name/Params
 404          * Extracts the special page name and call the execute method, passing the parameters
 405          *
 406          * Returns a title object if the page is redirected, false if there was no such special
 407          * page, and true if it was successful.
 408          *
 409          * @param $title          Title object
 410          * @param $context        RequestContext
 411          * @param $including      Bool output is being captured for use in {{special:whatever}}
 412          *
 413          * @return bool
 414          */
 415         public static function executePath( Title &$title, RequestContext &$context, $including = false ) {
 416                 wfProfileIn( __METHOD__ );
 417
 418                 // @todo FIXME: Redirects broken due to this call
 419                 $bits = explode( '/', $title->getDBkey(), 2 );
 420                 $name = $bits[0];
 421                 if ( !isset( $bits[1] ) ) { // bug 2087
 422                         $par = null;
 423                 } else {
 424                         $par = $bits[1];
 425                 }
 426                 $page = self::getPage( $name );
 427                 // Nonexistent?
 428                 if ( !$page ) {
 429                         $context->getOutput()->setArticleRelated( false );
 430                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 431                         $context->getOutput()->setStatusCode( 404 );
 432                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 433                         wfProfileOut( __METHOD__ );
 434                         return false;
 435                 }
 436
 437                 // Page exists, set the context
 438                 $page->setContext( $context );
 439
 440                 if ( !$including ) {
 441                         // Redirect to canonical alias for GET commands
 442                         // Not for POST, we'd lose the post data, so it's best to just distribute
 443                         // the request. Such POST requests are possible for old extensions that
 444                         // generate self-links without being aware that their default name has
 445                         // changed.
 446                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 447                                 $query = $context->getRequest()->getQueryValues();
 448                                 unset( $query['title'] );
 449                                 $query = wfArrayToCGI( $query );
 450                                 $title = $page->getTitle( $par );
 451                                 $url = $title->getFullUrl( $query );
 452                                 $context->getOutput()->redirect( $url );
 453                                 wfProfileOut( __METHOD__ );
 454                                 return $title;
 455                         } else {
 456                                 $context->setTitle( $page->getTitle() );
 457                         }
 458
 459                 } elseif ( !$page->isIncludable() ) {
 460                         wfProfileOut( __METHOD__ );
 461                         return false;
 462                 }
 463
 464                 $page->including( $including );
 465
 466                 // Execute special page
 467                 $profName = 'Special:' . $page->getName();
 468                 wfProfileIn( $profName );
 469                 $page->execute( $par );
 470                 wfProfileOut( $profName );
 471                 wfProfileOut( __METHOD__ );
 472                 return true;
 473         }
 474
 475         /**
 476          * Just like executePath() but will override global variables and execute
 477          * the page in "inclusion" mode. Returns true if the excution was successful
 478          * or false if there was no such special page, or a title object if it was
 479          * a redirect.
 480          *
 481          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 482          * variables so that the special page will get the context it'd expect on a
 483          * normal request, and then restores them to their previous values after.
 484          *
 485          * @param $title Title
 486          * @param $context RequestContext
 487          *
 488          * @return String: HTML fragment
 489          */
 490         static function capturePath( Title $title, RequestContext $context ) {
 491                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 492
 493                 // Save current globals
 494                 $oldTitle = $wgTitle;
 495                 $oldOut = $wgOut;
 496                 $oldRequest = $wgRequest;
 497                 $oldUser = $wgUser;
 498                 $oldLang = $wgLang;
 499
 500                 // Set the globals to the current context
 501                 $wgTitle = $title;
 502                 $wgOut = $context->getOutput();
 503                 $wgRequest = $context->getRequest();
 504                 $wgUser = $context->getUser();
 505                 $wgLang = $context->getLang();
 506
 507                 // The useful part
 508                 $ret = self::executePath( $title, $context, true );
 509
 510                 // And restore that globals
 511                 $wgTitle = $oldTitle;
 512                 $wgOut = $oldOut;
 513                 $wgRequest = $oldRequest;
 514                 $wgUser = $oldUser;
 515                 $wgLang = $oldLang;
 516
 517                 return $ret;
 518         }
 519
 520         /**
 521          * Get the local name for a specified canonical name
 522          *
 523          * @param $name String
 524          * @param $subpage String|Bool
 525          *
 526          * @return String
 527          */
 528         static function getLocalNameFor( $name, $subpage = false ) {
 529                 global $wgContLang;
 530                 $aliases = $wgContLang->getSpecialPageAliases();
 531
 532                 if ( isset( $aliases[$name][0] ) ) {
 533                         $name = $aliases[$name][0];
 534                 } else {
 535                         // Try harder in case someone misspelled the correct casing
 536                         $found = false;
 537                         foreach ( $aliases as $n => $values ) {
 538                                 if ( strcasecmp( $name, $n ) === 0 ) {
 539                                         wfWarn( "Found alias defined for $n when searching for " .
 540                                                 "special page aliases for $name. Case mismatch?" );
 541                                         $name = $values[0];
 542                                         $found = true;
 543                                         break;
 544                                 }
 545                         }
 546                         if ( !$found ) {
 547                                 wfWarn( "Did not find alias for special page '$name'. " .
 548                                         "Perhaps no aliases are defined for it?" );
 549                         }
 550                 }
 551                 if ( $subpage !== false && !is_null( $subpage ) ) {
 552                         $name = "$name/$subpage";
 553                 }
 554                 return $wgContLang->ucfirst( $name );
 555         }
 556
 557         /**
 558          * Get a title for a given alias
 559          *
 560          * @param $alias String
 561          *
 562          * @return Title or null if there is no such alias
 563          */
 564         static function getTitleForAlias( $alias ) {
 565                 $name = self::resolveAlias( $alias );
 566                 if ( $name ) {
 567                         return SpecialPage::getTitleFor( $name );
 568                 } else {
 569                         return null;
 570                 }
 571         }
 572 }