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 $wgOut. The parent class has an execute() method
  35  * which distributes the call to the historical global functions. Additionally,
  36  * execute() also checks if the user has the necessary access privileges
  37  * and bails out if not.
  38  *
  39  * To add a core special page, use the similar static list in
  40  * SpecialPageFactory::$list. 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 $list = 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                 'Listredirects'             => 'ListredirectsPage',
  82                 'PagesWithProp'             => 'SpecialPagesWithProp',
  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                 'ResetTokens'               => 'SpecialResetTokens',
  97                 'Contributions'             => 'SpecialContributions',
  98                 'Listgrouprights'           => 'SpecialListGroupRights',
  99                 'Listusers'                 => 'SpecialListUsers',
 100                 'Listadmins'                => 'SpecialListAdmins',
 101                 'Listbots'                  => 'SpecialListBots',
 102                 'Activeusers'               => 'SpecialActiveUsers',
 103                 'Userrights'                => 'UserrightsPage',
 104                 'EditWatchlist'             => 'SpecialEditWatchlist',
 105
 106                 // Recent changes and logs
 107                 'Newimages'                 => 'SpecialNewFiles',
 108                 'Log'                       => 'SpecialLog',
 109                 'Watchlist'                 => 'SpecialWatchlist',
 110                 'Newpages'                  => 'SpecialNewpages',
 111                 'Recentchanges'             => 'SpecialRecentChanges',
 112                 'Recentchangeslinked'       => 'SpecialRecentchangeslinked',
 113                 'Tags'                      => 'SpecialTags',
 114
 115                 // Media reports and uploads
 116                 'Listfiles'                 => 'SpecialListFiles',
 117                 'Filepath'                  => 'SpecialFilepath',
 118                 'MIMEsearch'                => 'MIMEsearchPage',
 119                 'FileDuplicateSearch'       => 'FileDuplicateSearchPage',
 120                 'Upload'                    => 'SpecialUpload',
 121                 'UploadStash'               => 'SpecialUploadStash',
 122
 123                 // Data and tools
 124                 'Statistics'                => 'SpecialStatistics',
 125                 'Allmessages'               => 'SpecialAllmessages',
 126                 'Version'                   => 'SpecialVersion',
 127                 'Lockdb'                    => 'SpecialLockdb',
 128                 'Unlockdb'                  => 'SpecialUnlockdb',
 129
 130                 // Redirecting special pages
 131                 'LinkSearch'                => 'LinkSearchPage',
 132                 'Randompage'                => 'Randompage',
 133                 'RandomInCategory'          => 'SpecialRandomInCategory',
 134                 'Randomredirect'            => 'SpecialRandomredirect',
 135
 136                 // High use pages
 137                 'Mostlinkedcategories'      => 'MostlinkedCategoriesPage',
 138                 'Mostimages'                => 'MostimagesPage',
 139                 'Mostinterwikis'            => 'MostinterwikisPage',
 140                 'Mostlinked'                => 'MostlinkedPage',
 141                 'Mostlinkedtemplates'       => 'MostlinkedTemplatesPage',
 142                 'Mostcategories'            => 'MostcategoriesPage',
 143                 'Mostrevisions'             => 'MostrevisionsPage',
 144
 145                 // Page tools
 146                 'ComparePages'              => 'SpecialComparePages',
 147                 'Export'                    => 'SpecialExport',
 148                 'Import'                    => 'SpecialImport',
 149                 'Undelete'                  => 'SpecialUndelete',
 150                 'Whatlinkshere'             => 'SpecialWhatlinkshere',
 151                 'MergeHistory'              => 'SpecialMergeHistory',
 152                 'ExpandTemplates'           => 'SpecialExpandTemplates',
 153
 154                 // Other
 155                 'Booksources'               => 'SpecialBookSources',
 156
 157                 // Unlisted / redirects
 158                 'Blankpage'                 => 'SpecialBlankpage',
 159                 'Emailuser'                 => 'SpecialEmailUser',
 160                 'Movepage'                  => 'MovePageForm',
 161                 'Mycontributions'           => 'SpecialMycontributions',
 162                 'Mypage'                    => 'SpecialMypage',
 163                 'Mytalk'                    => 'SpecialMytalk',
 164                 'Myuploads'                 => 'SpecialMyuploads',
 165                 'AllMyUploads'              => 'SpecialAllMyUploads',
 166                 'PermanentLink'             => 'SpecialPermanentLink',
 167                 'Redirect'                  => 'SpecialRedirect',
 168                 'Revisiondelete'            => 'SpecialRevisionDelete',
 169                 'Specialpages'              => 'SpecialSpecialpages',
 170                 'Userlogout'                => 'SpecialUserlogout',
 171         );
 172
 173         private static $aliases;
 174
 175         /**
 176          * Get the special page list
 177          *
 178          * @return array
 179          */
 180         static function getList() {
 181                 global $wgSpecialPages;
 182                 global $wgDisableCounters, $wgDisableInternalSearch, $wgEmailAuthentication;
 183                 global $wgEnableEmail, $wgEnableJavaScriptTest;
 184
 185                 if ( !is_object( self::$list ) ) {
 186                         wfProfileIn( __METHOD__ );
 187
 188                         if ( !$wgDisableCounters ) {
 189                                 self::$list['Popularpages'] = 'PopularpagesPage';
 190                         }
 191
 192                         if ( !$wgDisableInternalSearch ) {
 193                                 self::$list['Search'] = 'SpecialSearch';
 194                         }
 195
 196                         if ( $wgEmailAuthentication ) {
 197                                 self::$list['Confirmemail'] = 'EmailConfirmation';
 198                                 self::$list['Invalidateemail'] = 'EmailInvalidation';
 199                         }
 200
 201                         if ( $wgEnableEmail ) {
 202                                 self::$list['ChangeEmail'] = 'SpecialChangeEmail';
 203                         }
 204
 205                         if ( $wgEnableJavaScriptTest ) {
 206                                 self::$list['JavaScriptTest'] = 'SpecialJavaScriptTest';
 207                         }
 208
 209                         // Add extension special pages
 210                         self::$list = array_merge( self::$list, $wgSpecialPages );
 211
 212                         // Run hooks
 213                         // This hook can be used to remove undesired built-in special pages
 214                         wfRunHooks( 'SpecialPage_initList', array( &self::$list ) );
 215
 216                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 217                         settype( self::$list, 'object' );
 218
 219                         wfProfileOut( __METHOD__ );
 220                 }
 221                 return self::$list;
 222         }
 223
 224         /**
 225          * Initialise and return the list of special page aliases.  Returns an object with
 226          * properties which can be accessed $obj->pagename - each property is an array of
 227          * aliases; the first in the array is the canonical alias.  All registered special
 228          * pages are guaranteed to have a property entry, and for that property array to
 229          * contain at least one entry (English fallbacks will be added if necessary).
 230          * @return Object
 231          */
 232         static function getAliasList() {
 233                 if ( !is_object( self::$aliases ) ) {
 234                         global $wgContLang;
 235                         $aliases = $wgContLang->getSpecialPageAliases();
 236
 237                         // Objects are passed by reference by default, need to create a copy
 238                         $missingPages = clone self::getList();
 239
 240                         self::$aliases = array();
 241                         foreach ( $aliases as $realName => $aliasList ) {
 242                                 foreach ( $aliasList as $alias ) {
 243                                         self::$aliases[$wgContLang->caseFold( $alias )] = $realName;
 244                                 }
 245                                 unset( $missingPages->$realName );
 246                         }
 247                         foreach ( $missingPages as $name => $stuff ) {
 248                                 self::$aliases[$wgContLang->caseFold( $name )] = $name;
 249                         }
 250
 251                         // Cast to object: func()[$key] doesn't work, but func()->$key does
 252                         self::$aliases = (object)self::$aliases;
 253                 }
 254                 return self::$aliases;
 255         }
 256
 257         /**
 258          * Given a special page name with a possible subpage, return an array
 259          * where the first element is the special page name and the second is the
 260          * subpage.
 261          *
 262          * @param $alias String
 263          * @return Array( String, String|null ), or array( null, null ) if the page is invalid
 264          */
 265         public static function resolveAlias( $alias ) {
 266                 global $wgContLang;
 267                 $bits = explode( '/', $alias, 2 );
 268
 269                 $caseFoldedAlias = $wgContLang->caseFold( $bits[0] );
 270                 $caseFoldedAlias = str_replace( ' ', '_', $caseFoldedAlias );
 271                 if ( isset( self::getAliasList()->$caseFoldedAlias ) ) {
 272                         $name = self::getAliasList()->$caseFoldedAlias;
 273                 } else {
 274                         return array( null, null );
 275                 }
 276
 277                 if ( !isset( $bits[1] ) ) { // bug 2087
 278                         $par = null;
 279                 } else {
 280                         $par = $bits[1];
 281                 }
 282
 283                 return array( $name, $par );
 284         }
 285
 286         /**
 287          * Add a page to a certain display group for Special:SpecialPages
 288          *
 289          * @param $page Mixed: SpecialPage or string
 290          * @param $group String
 291          * @deprecated since 1.21 Override SpecialPage::getGroupName
 292          */
 293         public static function setGroup( $page, $group ) {
 294                 wfDeprecated( __METHOD__, '1.21' );
 295
 296                 global $wgSpecialPageGroups;
 297                 $name = is_object( $page ) ? $page->getName() : $page;
 298                 $wgSpecialPageGroups[$name] = $group;
 299         }
 300
 301         /**
 302          * Get the group that the special page belongs in on Special:SpecialPage
 303          *
 304          * @param $page SpecialPage
 305          * @return String
 306          * @deprecated since 1.21 Use SpecialPage::getFinalGroupName
 307          */
 308         public static function getGroup( &$page ) {
 309                 wfDeprecated( __METHOD__, '1.21' );
 310
 311                 return $page->getFinalGroupName();
 312         }
 313
 314         /**
 315          * Check if a given name exist as a special page or as a special page alias
 316          *
 317          * @param string $name name of a special page
 318          * @return Boolean: true if a special page exists with this name
 319          */
 320         public static function exists( $name ) {
 321                 list( $title, /*...*/ ) = self::resolveAlias( $name );
 322                 return property_exists( self::getList(), $title );
 323         }
 324
 325         /**
 326          * Find the object with a given name and return it (or NULL)
 327          *
 328          * @param string $name Special page name, may be localised and/or an alias
 329          * @return SpecialPage|null SpecialPage object or null if the page doesn't exist
 330          */
 331         public static function getPage( $name ) {
 332                 list( $realName, /*...*/ ) = self::resolveAlias( $name );
 333                 if ( property_exists( self::getList(), $realName ) ) {
 334                         $rec = self::getList()->$realName;
 335                         if ( is_string( $rec ) ) {
 336                                 $className = $rec;
 337                                 return new $className;
 338                         } elseif ( is_array( $rec ) ) {
 339                                 // @deprecated, officially since 1.18, unofficially since forever
 340                                 wfDebug( "Array syntax for \$wgSpecialPages is deprecated, define a subclass of SpecialPage instead." );
 341                                 $className = array_shift( $rec );
 342                                 self::getList()->$realName = MWFunction::newObj( $className, $rec );
 343                         }
 344                         return self::getList()->$realName;
 345                 } else {
 346                         return null;
 347                 }
 348         }
 349
 350         /**
 351          * Return categorised listable special pages which are available
 352          * for the current user, and everyone.
 353          *
 354          * @param $user User object to check permissions, $wgUser will be used
 355          *              if not provided
 356          * @return Array( String => Specialpage )
 357          */
 358         public static function getUsablePages( User $user = null ) {
 359                 $pages = array();
 360                 if ( $user === null ) {
 361                         global $wgUser;
 362                         $user = $wgUser;
 363                 }
 364                 foreach ( self::getList() as $name => $rec ) {
 365                         $page = self::getPage( $name );
 366                         if ( $page ) { // not null
 367                                 $page->setContext( RequestContext::getMain() );
 368                                 if ( $page->isListed()
 369                                         && ( !$page->isRestricted() || $page->userCanExecute( $user ) )
 370                                 ) {
 371                                         $pages[$name] = $page;
 372                                 }
 373                         }
 374                 }
 375                 return $pages;
 376         }
 377
 378         /**
 379          * Return categorised listable special pages for all users
 380          *
 381          * @return Array( String => Specialpage )
 382          */
 383         public static function getRegularPages() {
 384                 $pages = array();
 385                 foreach ( self::getList() as $name => $rec ) {
 386                         $page = self::getPage( $name );
 387                         if ( $page->isListed() && !$page->isRestricted() ) {
 388                                 $pages[$name] = $page;
 389                         }
 390                 }
 391                 return $pages;
 392         }
 393
 394         /**
 395          * Return categorised listable special pages which are available
 396          * for the current user, but not for everyone
 397          *
 398          * @return Array( String => Specialpage )
 399          */
 400         public static function getRestrictedPages() {
 401                 global $wgUser;
 402                 $pages = array();
 403                 foreach ( self::getList() as $name => $rec ) {
 404                         $page = self::getPage( $name );
 405                         if (
 406                                 $page->isListed()
 407                                 && $page->isRestricted()
 408                                 && $page->userCanExecute( $wgUser )
 409                         ) {
 410                                 $pages[$name] = $page;
 411                         }
 412                 }
 413                 return $pages;
 414         }
 415
 416         /**
 417          * Execute a special page path.
 418          * The path may contain parameters, e.g. Special:Name/Params
 419          * Extracts the special page name and call the execute method, passing the parameters
 420          *
 421          * Returns a title object if the page is redirected, false if there was no such special
 422          * page, and true if it was successful.
 423          *
 424          * @param $title          Title object
 425          * @param $context        IContextSource
 426          * @param $including      Bool output is being captured for use in {{special:whatever}}
 427          *
 428          * @return bool
 429          */
 430         public static function executePath( Title &$title, IContextSource &$context, $including = false ) {
 431                 wfProfileIn( __METHOD__ );
 432
 433                 // @todo FIXME: Redirects broken due to this call
 434                 $bits = explode( '/', $title->getDBkey(), 2 );
 435                 $name = $bits[0];
 436                 if ( !isset( $bits[1] ) ) { // bug 2087
 437                         $par = null;
 438                 } else {
 439                         $par = $bits[1];
 440                 }
 441                 $page = self::getPage( $name );
 442                 // Nonexistent?
 443                 if ( !$page ) {
 444                         $context->getOutput()->setArticleRelated( false );
 445                         $context->getOutput()->setRobotPolicy( 'noindex,nofollow' );
 446
 447                         global $wgSend404Code;
 448                         if ( $wgSend404Code ) {
 449                                 $context->getOutput()->setStatusCode( 404 );
 450                         }
 451
 452                         $context->getOutput()->showErrorPage( 'nosuchspecialpage', 'nospecialpagetext' );
 453                         wfProfileOut( __METHOD__ );
 454                         return false;
 455                 }
 456
 457                 // Page exists, set the context
 458                 $page->setContext( $context );
 459
 460                 if ( !$including ) {
 461                         // Redirect to canonical alias for GET commands
 462                         // Not for POST, we'd lose the post data, so it's best to just distribute
 463                         // the request. Such POST requests are possible for old extensions that
 464                         // generate self-links without being aware that their default name has
 465                         // changed.
 466                         if ( $name != $page->getLocalName() && !$context->getRequest()->wasPosted() ) {
 467                                 $query = $context->getRequest()->getQueryValues();
 468                                 unset( $query['title'] );
 469                                 $title = $page->getTitle( $par );
 470                                 $url = $title->getFullURL( $query );
 471                                 $context->getOutput()->redirect( $url );
 472                                 wfProfileOut( __METHOD__ );
 473                                 return $title;
 474                         } else {
 475                                 $context->setTitle( $page->getTitle( $par ) );
 476                         }
 477
 478                 } elseif ( !$page->isIncludable() ) {
 479                         wfProfileOut( __METHOD__ );
 480                         return false;
 481                 }
 482
 483                 $page->including( $including );
 484
 485                 // Execute special page
 486                 $profName = 'Special:' . $page->getName();
 487                 wfProfileIn( $profName );
 488                 $page->run( $par );
 489                 wfProfileOut( $profName );
 490                 wfProfileOut( __METHOD__ );
 491                 return true;
 492         }
 493
 494         /**
 495          * Just like executePath() but will override global variables and execute
 496          * the page in "inclusion" mode. Returns true if the execution was
 497          * successful or false if there was no such special page, or a title object
 498          * if it was a redirect.
 499          *
 500          * Also saves the current $wgTitle, $wgOut, $wgRequest, $wgUser and $wgLang
 501          * variables so that the special page will get the context it'd expect on a
 502          * normal request, and then restores them to their previous values after.
 503          *
 504          * @param $title Title
 505          * @param $context IContextSource
 506          *
 507          * @return String: HTML fragment
 508          */
 509         static function capturePath( Title $title, IContextSource $context ) {
 510                 global $wgOut, $wgTitle, $wgRequest, $wgUser, $wgLang;
 511
 512                 // Save current globals
 513                 $oldTitle = $wgTitle;
 514                 $oldOut = $wgOut;
 515                 $oldRequest = $wgRequest;
 516                 $oldUser = $wgUser;
 517                 $oldLang = $wgLang;
 518
 519                 // Set the globals to the current context
 520                 $wgTitle = $title;
 521                 $wgOut = $context->getOutput();
 522                 $wgRequest = $context->getRequest();
 523                 $wgUser = $context->getUser();
 524                 $wgLang = $context->getLanguage();
 525
 526                 // The useful part
 527                 $ret = self::executePath( $title, $context, true );
 528
 529                 // And restore the old globals
 530                 $wgTitle = $oldTitle;
 531                 $wgOut = $oldOut;
 532                 $wgRequest = $oldRequest;
 533                 $wgUser = $oldUser;
 534                 $wgLang = $oldLang;
 535
 536                 return $ret;
 537         }
 538
 539         /**
 540          * Get the local name for a specified canonical name
 541          *
 542          * @param $name String
 543          * @param $subpage String|Bool
 544          *
 545          * @return String
 546          */
 547         static function getLocalNameFor( $name, $subpage = false ) {
 548                 global $wgContLang;
 549                 $aliases = $wgContLang->getSpecialPageAliases();
 550
 551                 if ( isset( $aliases[$name][0] ) ) {
 552                         $name = $aliases[$name][0];
 553                 } else {
 554                         // Try harder in case someone misspelled the correct casing
 555                         $found = false;
 556                         foreach ( $aliases as $n => $values ) {
 557                                 if ( strcasecmp( $name, $n ) === 0 ) {
 558                                         wfWarn( "Found alias defined for $n when searching for " .
 559                                                 "special page aliases for $name. Case mismatch?" );
 560                                         $name = $values[0];
 561                                         $found = true;
 562                                         break;
 563                                 }
 564                         }
 565                         if ( !$found ) {
 566                                 wfWarn( "Did not find alias for special page '$name'. " .
 567                                         "Perhaps no aliases are defined for it?" );
 568                         }
 569                 }
 570                 if ( $subpage !== false && !is_null( $subpage ) ) {
 571                         $name = "$name/$subpage";
 572                 }
 573                 return $wgContLang->ucfirst( $name );
 574         }
 575
 576         /**
 577          * Get a title for a given alias
 578          *
 579          * @param $alias String
 580          *
 581          * @return Title or null if there is no such alias
 582          */
 583         static function getTitleForAlias( $alias ) {
 584                 $name = self::resolveAlias( $alias );
 585                 if ( $name ) {
 586                         return SpecialPage::getTitleFor( $name );
 587                 } else {
 588                         return null;
 589                 }
 590         }
 591 }