includes/SpecialPageFactory.php

   1 <?php
   2 /**
   3  * Factory for handling the special page list and generating SpecialPage objects.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  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  *
  28  * To add a special page in an extension, add to $wgSpecialPages either
  29  * an object instance or an array containing the name and constructor
  30  * parameters. The latter is preferred for performance reasons.
  31  *
  32  * The object instantiated must be either an instance of SpecialPage or a
  33  * sub-class thereof. It must have an execute() method, which sends the HTML
  34  * for the special page to $wgOut. The parent class has an execute() method
  35  * which distributes the call to the historical global functions. Additionally,
  36  * execute() also checks if the user has the necessary access privileges
  37  * and bails out if not.
  38  *
  39  * To add a core special page, use the similar static list in
  40  * SpecialPage::$mList. To remove a core static special page at runtime, use
  41  * a SpecialPage_initList hook.
  42  *
  43  * @ingroup SpecialPage
  44  * @since 1.17
  45  */
  46 class SpecialPageFactory {
  47
  48         /**
  49          * List of special page names to the subclass of SpecialPage which handles them.
  50          */
  51         private static $mList = array(
  52                 // Maintenance Reports
  53                 'BrokenRedirects'           => 'BrokenRedirectsPage',
  54                 'Deadendpages'              => 'DeadendpagesPage',
  55                 'DoubleRedirects'           => 'DoubleRedirectsPage',
  56                 'Longpages'                 => 'LongpagesPage',
  57                 'Ancientpages'              => 'AncientpagesPage',
  58                 'Lonelypages'               => 'LonelypagesPage',
  59                 'Fewestrevisions'           => 'FewestrevisionsPage',
  60                 'Withoutinterwiki'          => 'WithoutinterwikiPage',
  61                 'Protectedpages'            => 'SpecialProtectedpages',
  62                 'Protectedtitles'           => 'SpecialProtectedtitles',
  63                 'Shortpages'                => 'ShortpagesPage',
  64                 'Uncategorizedcategories'   => 'UncategorizedcategoriesPage',
  65                 'Uncategorizedimages'       => 'UncategorizedimagesPage',
  66                 'Uncategorizedpages'        => 'UncategorizedpagesPage',
  67                 'Uncategorizedtemplates'    => 'UncategorizedtemplatesPage',
  68                 'Unusedcategories'          => 'UnusedcategoriesPage',
  69                 'Unusedimages'              => 'UnusedimagesPage',
  70                 'Unusedtemplates'           => 'UnusedtemplatesPage',
  71                 'Unwatchedpages'            => 'UnwatchedpagesPage',
  72                 'Wantedcategories'          => 'WantedcategoriesPage',
  73                 'Wantedfiles'               => 'WantedfilesPage',
  74                 'Wantedpages'               => 'WantedpagesPage',
  75                 'Wantedtemplates'           => 'WantedtemplatesPage',
  76
  77                 // List of pages
  78                 'Allpages'                  => 'SpecialAllpages',
  79                 'Prefixindex'               => 'SpecialPrefixindex',
  80                 'Categories'                => 'SpecialCategories',
  81                 'Disambiguations'           => 'DisambiguationsPage',
  82                 'Listredirects'             => 'ListredirectsPage',
  83
  84                 // Login/create account
  85                 'Userlogin'                 => 'LoginForm',
  86                 'CreateAccount'             => 'SpecialCreateAccount',
  87
  88                 // Users and rights
  89                 'Block'                     => 'SpecialBlock',
  90                 'Unblock'                   => 'SpecialUnblock',
  91                 'BlockList'                 => 'SpecialBlockList',
  92                 'ChangePassword'            => 'SpecialChangePassword',
  93                 'PasswordReset'             => 'SpecialPasswordReset',
  94                 'DeletedContributions'      => 'DeletedContributionsPage',
  95                 'Preferences'               => 'SpecialPreferences',
  96                 'Contributions'             => 'SpecialContributions',
  97                 'Listgrouprights'           => 'SpecialListGroupRights',
  98                 'Listusers'                 => 'SpecialListUsers' ,
  99                 'Listadmins'                => 'SpecialListAdmins',
 100                 'Listbots'                  => 'SpecialListBots',
 101                 'Activeusers'               => 'SpecialActiveUsers',
 102                 'Userrights'                => 'UserrightsPage',
 103                 'EditWatchlist'             => 'SpecialEditWatchlist',
 104
 105                 // Recent changes and logs
 106                 'Newimages'                 => 'SpecialNewFiles',
 107                 'Log'                       => 'SpecialLog',
 108                 'Watchlist'                 => 'SpecialWatchlist',
 109                 'Newpages'                  => 'SpecialNewpages',
 110                 'Recentchanges'             => 'SpecialRecentchanges',
 111                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 112                 'Tags'                      => 'SpecialTags',
 113
 114                 // Media reports and uploads
 115                 'Listfiles'                 => 'SpecialListFiles',
 116                 'Filepath'                  => 'SpecialFilepath',
 117                 'MIMEsearch'                => 'MIMEsearchPage',
 118                 'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
 119                 'Upload'                    => 'SpecialUpload',
 120                 'UploadStash'               => 'SpecialUploadStash',
 121
 122                 // Wiki data and tools
 123                 'Statistics'                => 'SpecialStatistics',
 124                 'Allmessages'               => 'SpecialAllmessages',
 125                 'Version'                   => 'SpecialVersion',
 126                 'Lockdb'                    => 'SpecialLockdb',
 127                 'Unlockdb'                  => 'SpecialUnlockdb',
 128
 129                 // Redirecting special pages
 130                 'LinkSearch'                => 'LinkSearchPage',
 131                 'Randompage'                => 'Randompage',
 132                 'Randomredirect'            => 'SpecialRandomredirect',
 133
 134                 // High use pages
 135                 'Mostlinkedcategories'      => 'MostlinkedCategoriesPage',
 136                 'Mostimages'                => 'MostimagesPage',
 137                 'Mostinterwikis'            => 'MostinterwikisPage',
 138                 'Mostlinked'                => 'MostlinkedPage',
 139                 'Mostlinkedtemplates'       => 'MostlinkedTemplatesPage',
 140                 'Mostcategories'            => 'MostcategoriesPage',
 141                 'Mostrevisions'             => 'MostrevisionsPage',
 142
 143                 // Page tools
 144                 'ComparePages'              => 'SpecialComparePages',
 145                 'Export'                    => 'SpecialExport',
 146                 'Import'                    => 'SpecialImport',
 147                 'Undelete'                  => 'SpecialUndelete',
 148                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 149                 'MergeHistory'              => 'SpecialMergeHistory',
 150
 151                 // Other
 152                 'Booksources'               => 'SpecialBookSources',
 153
 154                 // Unlisted / redirects
 155                 'Blankpage'                 => 'SpecialBlankpage',
 156                 'Blockme'                   => 'SpecialBlockme',
 157                 'Emailuser'                 => 'SpecialEmailUser',
 158                 'Movepage'                  => 'MovePageForm',
 159                 'Mycontributions'           => 'SpecialMycontributions',
 160                 'Mypage'                    => 'SpecialMypage',
 161                 'Mytalk'                    => 'SpecialMytalk',
 162                 'Myuploads'                 => 'SpecialMyuploads',
 163                 'PermanentLink'             => 'SpecialPermanentLink',
 164                 'Revisiondelete'            => 'SpecialRevisionDelete',
 165                 'Specialpages'              => 'SpecialSpecialpages',
 166                 'Userlogout'                => 'SpecialUserlogout',
 167         );
 168
 169         private static $mAliases;
 170
 171         /**
 172          * Initialise the special page list
 173          * This must be called before accessing SpecialPage::$mList
 174          *
 175          * @return array
 176          */
 177         static function getList() {
 178                 global $wgSpecialPages;
 179                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 180                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 181
 182                 if ( !is_object( self::$mList ) ) {
 183                         wfProfileIn( __METHOD__ );
 184
 185                         if ( !$wgDisableCounters ) {
 186                                 self::$mList['Popularpages'] = 'PopularpagesPage';
 187                         }
 188
 189                         if ( !$wgDisableInternalSearch ) {
 190                                 self::$mList['Search'] = 'SpecialSearch';
 191                         }
 192
 193                         if ( $wgEmailAuthentication ) {
 194                                 self::$mList['Confirmemail'] = 'EmailConfirmation';
 195                                 self::$mList['Invalidateemail'] = 'EmailInvalidation';
 196                         }
 197
 198                         if ( $wgEnableEmail ) {
 199                                 self::$mList['ChangeEmail'] = 'SpecialChangeEmail';
 200                         }
 201
 202                         if( $wgEnableJavaScriptTest ) {
 203                                 self::$mList['JavaScriptTest'] = 'SpecialJavaScriptTest';
 204                         }
 205
 206                         // Add extension special pages
 207                         self::$mList = array_merge( self::$mList, $wgSpecialPages );
 208
 209                         // Run hooks
 210                         // This hook can be used to remove undesired built-in special pages
 211                         wfRunHooks( 'SpecialPage_initList', array( &self::$mList ) );
 212
 213                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 214                         settype( self::$mList, 'object' );
 215
 216                         wfProfileOut( __METHOD__ );
 217                 }
 218                 return self::$mList;
 219         }
 220
 221         /**
 222          * Initialise and return the list of special page aliases.  Returns an object with
 223          * properties which can be accessed $obj->pagename - each property is an array of
 224          * aliases; the first in the array is the cannonical alias.  All registered special
 225          * pages are guaranteed to have a property entry, and for that property array to
 226          * contain at least one entry (English fallbacks will be added if necessary).
 227          * @return Object
 228          */
 229         static function getAliasList() {
 230                 if ( !is_object( self::$mAliases ) ) {
 231                         global $wgContLang;
 232                         $aliases = $wgContLang->getSpecialPageAliases();
 233
 234                         // Objects are passed by reference by default, need to create a copy
 235                         $missingPages = clone self::getList();
 236
 237                         self::$mAliases = array();
 238                         foreach ( $aliases as $realName => $aliasList ) {
 239                                 foreach ( $aliasList as $alias ) {
 240                                         self::$mAliases[$wgContLang->caseFold( $alias )] = $realName;
 241                                 }
 242                                 unset( $missingPages->$realName );
 243                         }
 244                         foreach ( $missingPages as $name => $stuff ) {
 245                                 self::$mAliases[$wgContLang->caseFold( $name )] = $name;
 246                         }
 247
 248                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 249                         self::$mAliases = (object)self::$mAliases;
 250                 }
 251                 return self::$mAliases;
 252         }
 253
 254         /**
 255          * Given a special page name with a possible subpage, return an array
 256          * where the first element is the special page name and the second is the
 257          * subpage.
 258          *
 259          * @param $alias String
 260          * @return Array( String, String|null ), or array( null, null ) if the page is invalid
 261          */
 262         public static function resolveAlias( $alias ) {
 263                 global $wgContLang;
 264                 $bits = explode( '/', $alias, 2 );
 265
 266                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 267                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 268                 if ( isset( self::getAliasList()->$caseFoldedAlias ) ) {
 269                         $name = self::getAliasList()->$caseFoldedAlias;
 270                 } else {
 271                         return array( null, null );
 272                 }
 273
 274                 if ( !isset( $bits[1] ) ) { // bug 2087
 275                         $par = null;
 276                 } else {
 277                         $par = $bits[1];
 278                 }
 279
 280                 return array( $name, $par );
 281         }
 282
 283         /**
 284          * Add a page to a certain display group for Special:SpecialPages
 285          *
 286          * @param $page Mixed: SpecialPage or string
 287          * @param $group String
 288          */
 289         public static function setGroup( $page, $group ) {
 290                 global $wgSpecialPageGroups;
 291                 $name = is_object( $page ) ? $page->getName() : $page;
 292                 $wgSpecialPageGroups[$name] = $group;
 293         }
 294
 295         /**
 296          * Get the group that the special page belongs in on Special:SpecialPage
 297          *
 298          * @param $page SpecialPage
 299          * @return String
 300          */
 301         public static function getGroup( &$page ) {
 302                 $name = $page->getName();
 303
 304                 global $wgSpecialPageGroups;
 305                 static $specialPageGroupsCache = array();
 306                 if ( isset( $specialPageGroupsCache[$name] ) ) {
 307                         return $specialPageGroupsCache[$name];
 308                 }
 309                 $msg = wfMessage( 'specialpages-specialpagegroup-' . strtolower( $name ) );
 310                 if ( !$msg->isBlank() ) {
 311                         $group = $msg->text();
 312                 } else {
 313                         $group = isset( $wgSpecialPageGroups[$name] )
 314                                 ? $wgSpecialPageGroups[$name]
 315                                 : '-';
 316                 }
 317                 if ( $group == '-' ) {
 318                         $group = 'other';
 319                 }
 320                 $specialPageGroupsCache[$name] = $group;
 321                 return $group;
 322         }
 323
 324         /**
 325          * Check if a given name exist as a special page or as a special page alias
 326          *
 327          * @param $name String: name of a special page
 328          * @return Boolean: true if a special page exists with this name
 329          */
 330         public static function exists( $name ) {
 331                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 332                 return property_exists( self::getList(), $title );
 333         }
 334
 335         /**
 336          * Find the object with a given name and return it (or NULL)
 337          *
 338          * @param $name String Special page name, may be localised and/or an alias
 339          * @return SpecialPage object or null if the page doesn't exist
 340          */
 341         public static function getPage( $name ) {
 342                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 343                 if ( property_exists( self::getList(), $realName ) ) {
 344                         $rec = self::getList()->$realName;
 345                         if ( is_string( $rec ) ) {
 346                                 $className = $rec;
 347                                 return new $className;
 348                         } elseif ( is_array( $rec ) ) {
 349                                 // @deprecated, officially since 1.18, unofficially since forever
 350                                 wfDebug( "Array syntax for \$wgSpecialPages is deprecated, define a subclass of SpecialPage instead." );
 351                                 $className = array_shift( $rec );
 352                                 self::getList()->$realName = MWFunction::newObj( $className, $rec );
 353                         }
 354                         return self::getList()->$realName;
 355                 } else {
 356                         return null;
 357                 }
 358         }
 359
 360         /**
 361          * Return categorised listable special pages which are available
 362          * for the current user, and everyone.
 363          *
 364          * @param $user User object to check permissions, $wgUser will be used
 365          *              if not provided
 366          * @return Array( String => Specialpage )
 367          */
 368         public static function getUsablePages( User $user = null ) {
 369                 $pages = array();
 370                 if ( $user === null ) {
 371                         global $wgUser;
 372                         $user = $wgUser;
 373                 }
 374                 $context = RequestContext::newExtraneousContext( Title::newMainPage() );
 375                 $context->setUser( $user );
 376                 foreach ( self::getList() as $name => $rec ) {
 377                         $page = self::getPage( $name );
 378                         if ( $page ) { // not null
 379                                 $page->setContext( $context );
 380                                 if ( $page->isListed()
 381                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 382                                 ) {
 383                                         $pages[$name] = $page;
 384                                 }
 385                         }
 386                 }
 387                 return $pages;
 388         }
 389
 390         /**
 391          * Return categorised listable special pages for all users
 392          *
 393          * @return Array( String => Specialpage )
 394          */
 395         public static function getRegularPages() {
 396                 $pages = array();
 397                 foreach ( self::getList() as $name => $rec ) {
 398                         $page = self::getPage( $name );
 399                         if ( $page->isListed() && !$page->isRestricted() ) {
 400                                 $pages[$name] = $page;
 401                         }
 402                 }
 403                 return $pages;
 404         }
 405
 406         /**
 407          * Return categorised listable special pages which are available
 408          * for the current user, but not for everyone
 409          *
 410          * @return Array( String => Specialpage )
 411          */
 412         public static function getRestrictedPages() {
 413                 global $wgUser;
 414                 $pages = array();
 415                 foreach ( self::getList() as $name => $rec ) {
 416                         $page = self::getPage( $name );
 417                         if (
 418                                 $page->isListed()
 419                                 && $page->isRestricted()
 420                                 && $page->userCanExecute( $wgUser )
 421                         ) {
 422                                 $pages[$name] = $page;
 423                         }
 424                 }
 425                 return $pages;
 426         }
 427
 428         /**
 429          * Execute a special page path.
 430          * The path may contain parameters, e.g. Special:Name/Params
 431          * Extracts the special page name and call the execute method, passing the parameters
 432          *
 433          * Returns a title object if the page is redirected, false if there was no such special
 434          * page, and true if it was successful.
 435          *
 436          * @param $title          Title object
 437          * @param $context        IContextSource
 438          * @param $including      Bool output is being captured for use in {{special:whatever}}
 439          *
 440          * @return bool
 441          */
 442         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 443                 wfProfileIn( __METHOD__ );
 444
 445                 // @todo FIXME: Redirects broken due to this call
 446                 $bits = explode( '/', $title->getDBkey(), 2 );
 447                 $name = $bits[0];
 448                 if ( !isset( $bits[1] ) ) { // bug 2087
 449                         $par = null;
 450                 } else {
 451                         $par = $bits[1];
 452                 }
 453                 $page = self::getPage( $name );
 454                 // Nonexistent?
 455                 if ( !$page ) {
 456                         $context->getOutput()->setArticleRelated( false );
 457                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 458
 459                         global $wgSend404Code;
 460                         if ( $wgSend404Code ) {
 461                                 $context->getOutput()->setStatusCode( 404 );
 462                         }
 463
 464                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 465                         wfProfileOut( __METHOD__ );
 466                         return false;
 467                 }
 468
 469                 // Page exists, set the context
 470                 $page->setContext( $context );
 471
 472                 if ( !$including ) {
 473                         // Redirect to canonical alias for GET commands
 474                         // Not for POST, we'd lose the post data, so it's best to just distribute
 475                         // the request. Such POST requests are possible for old extensions that
 476                         // generate self-links without being aware that their default name has
 477                         // changed.
 478                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 479                                 $query = $context->getRequest()->getQueryValues();
 480                                 unset( $query['title'] );
 481                                 $query = wfArrayToCGI( $query );
 482                                 $title = $page->getTitle( $par );
 483                                 $url = $title->getFullUrl( $query );
 484                                 $context->getOutput()->redirect( $url );
 485                                 wfProfileOut( __METHOD__ );
 486                                 return $title;
 487                         } else {
 488                                 $context->setTitle( $page->getTitle( $par ) );
 489                         }
 490
 491                 } elseif ( !$page->isIncludable() ) {
 492                         wfProfileOut( __METHOD__ );
 493                         return false;
 494                 }
 495
 496                 $page->including( $including );
 497
 498                 // Execute special page
 499                 $profName = 'Special:' . $page->getName();
 500                 wfProfileIn( $profName );
 501                 $page->run( $par );
 502                 wfProfileOut( $profName );
 503                 wfProfileOut( __METHOD__ );
 504                 return true;
 505         }
 506
 507         /**
 508          * Just like executePath() but will override global variables and execute
 509          * the page in "inclusion" mode. Returns true if the execution was
 510          * successful or false if there was no such special page, or a title object
 511          * if it was a redirect.
 512          *
 513          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 514          * variables so that the special page will get the context it'd expect on a
 515          * normal request, and then restores them to their previous values after.
 516          *
 517          * @param $title Title
 518          * @param $context IContextSource
 519          *
 520          * @return String: HTML fragment
 521          */
 522         static function capturePath( Title $title, IContextSource $context ) {
 523                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 524
 525                 // Save current globals
 526                 $oldTitle = $wgTitle;
 527                 $oldOut = $wgOut;
 528                 $oldRequest = $wgRequest;
 529                 $oldUser = $wgUser;
 530                 $oldLang = $wgLang;
 531
 532                 // Set the globals to the current context
 533                 $wgTitle = $title;
 534                 $wgOut = $context->getOutput();
 535                 $wgRequest = $context->getRequest();
 536                 $wgUser = $context->getUser();
 537                 $wgLang = $context->getLanguage();
 538
 539                 // The useful part
 540                 $ret = self::executePath( $title, $context, true );
 541
 542                 // And restore the old globals
 543                 $wgTitle = $oldTitle;
 544                 $wgOut = $oldOut;
 545                 $wgRequest = $oldRequest;
 546                 $wgUser = $oldUser;
 547                 $wgLang = $oldLang;
 548
 549                 return $ret;
 550         }
 551
 552         /**
 553          * Get the local name for a specified canonical name
 554          *
 555          * @param $name String
 556          * @param $subpage String|Bool
 557          *
 558          * @return String
 559          */
 560         static function getLocalNameFor( $name, $subpage = false ) {
 561                 global $wgContLang;
 562                 $aliases = $wgContLang->getSpecialPageAliases();
 563
 564                 if ( isset( $aliases[$name][0] ) ) {
 565                         $name = $aliases[$name][0];
 566                 } else {
 567                         // Try harder in case someone misspelled the correct casing
 568                         $found = false;
 569                         foreach ( $aliases as $n => $values ) {
 570                                 if ( strcasecmp( $name, $n ) === 0 ) {
 571                                         wfWarn( "Found alias defined for $n when searching for " .
 572                                                 "special page aliases for $name. Case mismatch?" );
 573                                         $name = $values[0];
 574                                         $found = true;
 575                                         break;
 576                                 }
 577                         }
 578                         if ( !$found ) {
 579                                 wfWarn( "Did not find alias for special page '$name'. " .
 580                                         "Perhaps no aliases are defined for it?" );
 581                         }
 582                 }
 583                 if ( $subpage !== false && !is_null( $subpage ) ) {
 584                         $name = "$name/$subpage";
 585                 }
 586                 return $wgContLang->ucfirst( $name );
 587         }
 588
 589         /**
 590          * Get a title for a given alias
 591          *
 592          * @param $alias String
 593          *
 594          * @return Title or null if there is no such alias
 595          */
 596         static function getTitleForAlias( $alias ) {
 597                 $name = self::resolveAlias( $alias );
 598                 if ( $name ) {
 599                         return SpecialPage::getTitleFor( $name );
 600                 } else {
 601                         return null;
 602                 }
 603         }
 604 }