includes/SpecialPage.php

   1 <?php
   2 /**
   3  * Parent class for all special pages.
   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  */
  23
  24 /**
  25  * Parent special page class, also static functions for handling the special
  26  * page list.
  27  * @ingroup SpecialPage
  28  */
  29 class SpecialPage {
  30
  31         // The canonical name of this special page
  32         // Also used for the default <h1> heading, @see getDescription()
  33         protected $mName;
  34
  35         // The local name of this special page
  36         private $mLocalName;
  37
  38         // Minimum user level required to access this page, or "" for anyone.
  39         // Also used to categorise the pages in Special:Specialpages
  40         private $mRestriction;
  41
  42         // Listed in Special:Specialpages?
  43         private $mListed;
  44
  45         // Function name called by the default execute()
  46         private $mFunction;
  47
  48         // File which needs to be included before the function above can be called
  49         private $mFile;
  50
  51         // Whether or not this special page is being included from an article
  52         protected $mIncluding;
  53
  54         // Whether the special page can be included in an article
  55         protected $mIncludable;
  56
  57         /**
  58          * Current request context
  59          * @var IContextSource
  60          */
  61         protected $mContext;
  62
  63         /**
  64          * Initialise the special page list
  65          * This must be called before accessing SpecialPage::$mList
  66          * @deprecated since 1.18
  67          */
  68         static function initList() {
  69                 wfDeprecated( __METHOD__, '1.18' );
  70                 // Noop
  71         }
  72
  73         /**
  74          * @deprecated since 1.18
  75          */
  76         static function initAliasList() {
  77                 wfDeprecated( __METHOD__, '1.18' );
  78                 // Noop
  79         }
  80
  81         /**
  82          * Given a special page alias, return the special page name.
  83          * Returns false if there is no such alias.
  84          *
  85          * @param $alias String
  86          * @return String or false
  87          * @deprecated since 1.18 call SpecialPageFactory method directly
  88          */
  89         static function resolveAlias( $alias ) {
  90                 wfDeprecated( __METHOD__, '1.18' );
  91                 list( $name, /*...*/ ) = SpecialPageFactory::resolveAlias( $alias );
  92                 return $name;
  93         }
  94
  95         /**
  96          * Given a special page name with a possible subpage, return an array
  97          * where the first element is the special page name and the second is the
  98          * subpage.
  99          *
 100          * @param $alias String
 101          * @return Array
 102          * @deprecated since 1.18 call SpecialPageFactory method directly
 103          */
 104         static function resolveAliasWithSubpage( $alias ) {
 105                 return SpecialPageFactory::resolveAlias( $alias );
 106         }
 107
 108         /**
 109          * Add a page to a certain display group for Special:SpecialPages
 110          *
 111          * @param $page Mixed: SpecialPage or string
 112          * @param $group String
 113          * @deprecated since 1.18 call SpecialPageFactory method directly
 114          */
 115         static function setGroup( $page, $group ) {
 116                 wfDeprecated( __METHOD__, '1.18' );
 117                 SpecialPageFactory::setGroup( $page, $group );
 118         }
 119
 120         /**
 121          * Get the group that the special page belongs in on Special:SpecialPage
 122          *
 123          * @param $page SpecialPage
 124          * @return string
 125          * @deprecated since 1.18 call SpecialPageFactory method directly
 126          */
 127         static function getGroup( &$page ) {
 128                 wfDeprecated( __METHOD__, '1.18' );
 129                 return SpecialPageFactory::getGroup( $page );
 130         }
 131
 132         /**
 133          * Remove a special page from the list
 134          * Formerly used to disable expensive or dangerous special pages. The
 135          * preferred method is now to add a SpecialPage_initList hook.
 136          * @deprecated since 1.18
 137          *
 138          * @param string $name the page to remove
 139          */
 140         static function removePage( $name ) {
 141                 wfDeprecated( __METHOD__, '1.18' );
 142                 unset( SpecialPageFactory::getList()->$name );
 143         }
 144
 145         /**
 146          * Check if a given name exist as a special page or as a special page alias
 147          *
 148          * @param string $name name of a special page
 149          * @return Boolean: true if a special page exists with this name
 150          * @deprecated since 1.18 call SpecialPageFactory method directly
 151          */
 152         static function exists( $name ) {
 153                 wfDeprecated( __METHOD__, '1.18' );
 154                 return SpecialPageFactory::exists( $name );
 155         }
 156
 157         /**
 158          * Find the object with a given name and return it (or NULL)
 159          *
 160          * @param $name String
 161          * @return SpecialPage object or null if the page doesn't exist
 162          * @deprecated since 1.18 call SpecialPageFactory method directly
 163          */
 164         static function getPage( $name ) {
 165                 wfDeprecated( __METHOD__, '1.18' );
 166                 return SpecialPageFactory::getPage( $name );
 167         }
 168
 169         /**
 170          * Get a special page with a given localised name, or NULL if there
 171          * is no such special page.
 172          *
 173          * @param $alias String
 174          * @return SpecialPage object or null if the page doesn't exist
 175          * @deprecated since 1.18 call SpecialPageFactory method directly
 176          */
 177         static function getPageByAlias( $alias ) {
 178                 wfDeprecated( __METHOD__, '1.18' );
 179                 return SpecialPageFactory::getPage( $alias );
 180         }
 181
 182         /**
 183          * Return categorised listable special pages which are available
 184          * for the current user, and everyone.
 185          *
 186          * @param $user User object to check permissions, $wgUser will be used
 187          *              if not provided
 188          * @return array Associative array mapping page's name to its SpecialPage object
 189          * @deprecated since 1.18 call SpecialPageFactory method directly
 190          */
 191         static function getUsablePages( User $user = null ) {
 192                 wfDeprecated( __METHOD__, '1.18' );
 193                 return SpecialPageFactory::getUsablePages( $user );
 194         }
 195
 196         /**
 197          * Return categorised listable special pages for all users
 198          *
 199          * @return array Associative array mapping page's name to its SpecialPage object
 200          * @deprecated since 1.18 call SpecialPageFactory method directly
 201          */
 202         static function getRegularPages() {
 203                 wfDeprecated( __METHOD__, '1.18' );
 204                 return SpecialPageFactory::getRegularPages();
 205         }
 206
 207         /**
 208          * Return categorised listable special pages which are available
 209          * for the current user, but not for everyone
 210          *
 211          * @return array Associative array mapping page's name to its SpecialPage object
 212          * @deprecated since 1.18 call SpecialPageFactory method directly
 213          */
 214         static function getRestrictedPages() {
 215                 wfDeprecated( __METHOD__, '1.18' );
 216                 return SpecialPageFactory::getRestrictedPages();
 217         }
 218
 219         /**
 220          * Execute a special page path.
 221          * The path may contain parameters, e.g. Special:Name/Params
 222          * Extracts the special page name and call the execute method, passing the parameters
 223          *
 224          * Returns a title object if the page is redirected, false if there was no such special
 225          * page, and true if it was successful.
 226          *
 227          * @param $title          Title object
 228          * @param $context        IContextSource
 229          * @param $including      Bool output is being captured for use in {{special:whatever}}
 230          * @return Bool
 231          * @deprecated since 1.18 call SpecialPageFactory method directly
 232          */
 233         public static function executePath( &$title, IContextSource &$context, $including = false ) {
 234                 wfDeprecated( __METHOD__, '1.18' );
 235                 return SpecialPageFactory::executePath( $title, $context, $including );
 236         }
 237
 238         /**
 239          * Get the local name for a specified canonical name
 240          *
 241          * @param $name String
 242          * @param $subpage Mixed: boolean false, or string
 243          *
 244          * @return String
 245          * @deprecated since 1.18 call SpecialPageFactory method directly
 246          */
 247         static function getLocalNameFor( $name, $subpage = false ) {
 248                 wfDeprecated( __METHOD__, '1.18' );
 249                 return SpecialPageFactory::getLocalNameFor( $name, $subpage );
 250         }
 251
 252         /**
 253          * Get a localised Title object for a specified special page name
 254          *
 255          * @param $name String
 256          * @param string|Bool $subpage subpage string, or false to not use a subpage
 257          * @param string $fragment the link fragment (after the "#")
 258          * @throws MWException
 259          * @return Title object
 260          */
 261         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
 262                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
 263                 if ( $name ) {
 264                         return Title::makeTitle( NS_SPECIAL, $name, $fragment );
 265                 } else {
 266                         throw new MWException( "Invalid special page name \"$name\"" );
 267                 }
 268         }
 269
 270         /**
 271          * Get a localised Title object for a page name with a possibly unvalidated subpage
 272          *
 273          * @param $name String
 274          * @param string|Bool $subpage subpage string, or false to not use a subpage
 275          * @return Title object or null if the page doesn't exist
 276          */
 277         public static function getSafeTitleFor( $name, $subpage = false ) {
 278                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
 279                 if ( $name ) {
 280                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 281                 } else {
 282                         return null;
 283                 }
 284         }
 285
 286         /**
 287          * Get a title for a given alias
 288          *
 289          * @param $alias String
 290          * @return Title or null if there is no such alias
 291          * @deprecated since 1.18 call SpecialPageFactory method directly
 292          */
 293         static function getTitleForAlias( $alias ) {
 294                 wfDeprecated( __METHOD__, '1.18' );
 295                 return SpecialPageFactory::getTitleForAlias( $alias );
 296         }
 297
 298         /**
 299          * Default constructor for special pages
 300          * Derivative classes should call this from their constructor
 301          *     Note that if the user does not have the required level, an error message will
 302          *     be displayed by the default execute() method, without the global function ever
 303          *     being called.
 304          *
 305          *     If you override execute(), you can recover the default behavior with userCanExecute()
 306          *     and displayRestrictionError()
 307          *
 308          * @param string $name name of the special page, as seen in links and URLs
 309          * @param string $restriction user right required, e.g. "block" or "delete"
 310          * @param bool $listed whether the page is listed in Special:Specialpages
 311          * @param $function Callback|Bool: function called by execute(). By default it is constructed from $name
 312          * @param string $file file which is included by execute(). It is also constructed from $name by default
 313          * @param bool $includable whether the page can be included in normal pages
 314          */
 315         public function __construct(
 316                 $name = '', $restriction = '', $listed = true,
 317                 $function = false, $file = 'default', $includable = false
 318         ) {
 319                 $this->init( $name, $restriction, $listed, $function, $file, $includable );
 320         }
 321
 322         /**
 323          * Do the real work for the constructor, mainly so __call() can intercept
 324          * calls to SpecialPage()
 325          * @param string $name name of the special page, as seen in links and URLs
 326          * @param string $restriction user right required, e.g. "block" or "delete"
 327          * @param bool $listed whether the page is listed in Special:Specialpages
 328          * @param $function Callback|Bool: function called by execute(). By default it is constructed from $name
 329          * @param string $file file which is included by execute(). It is also constructed from $name by default
 330          * @param bool $includable whether the page can be included in normal pages
 331          */
 332         private function init( $name, $restriction, $listed, $function, $file, $includable ) {
 333                 $this->mName = $name;
 334                 $this->mRestriction = $restriction;
 335                 $this->mListed = $listed;
 336                 $this->mIncludable = $includable;
 337                 if ( !$function ) {
 338                         $this->mFunction = 'wfSpecial' . $name;
 339                 } else {
 340                         $this->mFunction = $function;
 341                 }
 342                 if ( $file === 'default' ) {
 343                         $this->mFile = __DIR__ . "/specials/Special$name.php";
 344                 } else {
 345                         $this->mFile = $file;
 346                 }
 347         }
 348
 349         /**
 350          * Use PHP's magic __call handler to get calls to the old PHP4 constructor
 351          * because PHP E_STRICT yells at you for having __construct() and SpecialPage()
 352          *
 353          * @param string $fName Name of called method
 354          * @param array $a Arguments to the method
 355          * @throws MWException
 356          * @deprecated since 1.17, call parent::__construct()
 357          */
 358         public function __call( $fName, $a ) {
 359                 // Deprecated messages now, remove in 1.19 or 1.20?
 360                 wfDeprecated( __METHOD__, '1.17' );
 361
 362                 // Sometimes $fName is SpecialPage, sometimes it's specialpage. <3 PHP
 363                 if ( strtolower( $fName ) == 'specialpage' ) {
 364                         $name = isset( $a[0] ) ? $a[0] : '';
 365                         $restriction = isset( $a[1] ) ? $a[1] : '';
 366                         $listed = isset( $a[2] ) ? $a[2] : true;
 367                         $function = isset( $a[3] ) ? $a[3] : false;
 368                         $file = isset( $a[4] ) ? $a[4] : 'default';
 369                         $includable = isset( $a[5] ) ? $a[5] : false;
 370                         $this->init( $name, $restriction, $listed, $function, $file, $includable );
 371                 } else {
 372                         $className = get_class( $this );
 373                         throw new MWException( "Call to undefined method $className::$fName" );
 374                 }
 375         }
 376
 377         /**
 378          * Get the name of this Special Page.
 379          * @return String
 380          */
 381         function getName() {
 382                 return $this->mName;
 383         }
 384
 385         /**
 386          * Get the permission that a user must have to execute this page
 387          * @return String
 388          */
 389         function getRestriction() {
 390                 return $this->mRestriction;
 391         }
 392
 393         /**
 394          * Get the file which will be included by SpecialPage::execute() if your extension is
 395          * still stuck in the past and hasn't overridden the execute() method.  No modern code
 396          * should want or need to know this.
 397          * @return String
 398          * @deprecated since 1.18
 399          */
 400         function getFile() {
 401                 wfDeprecated( __METHOD__, '1.18' );
 402                 return $this->mFile;
 403         }
 404
 405         // @todo FIXME: Decide which syntax to use for this, and stick to it
 406         /**
 407          * Whether this special page is listed in Special:SpecialPages
 408          * @since r3583 (v1.3)
 409          * @return Bool
 410          */
 411         function isListed() {
 412                 return $this->mListed;
 413         }
 414         /**
 415          * Set whether this page is listed in Special:Specialpages, at run-time
 416          * @since r3583 (v1.3)
 417          * @param $listed Bool
 418          * @return Bool
 419          */
 420         function setListed( $listed ) {
 421                 return wfSetVar( $this->mListed, $listed );
 422         }
 423         /**
 424          * Get or set whether this special page is listed in Special:SpecialPages
 425          * @since r11308 (v1.6)
 426          * @param $x Bool
 427          * @return Bool
 428          */
 429         function listed( $x = null ) {
 430                 return wfSetVar( $this->mListed, $x );
 431         }
 432
 433         /**
 434          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 435          * @return Bool
 436          */
 437         public function isIncludable() {
 438                 return $this->mIncludable;
 439         }
 440
 441         /**
 442          * These mutators are very evil, as the relevant variables should not mutate.  So
 443          * don't use them.
 444          * @param $x Mixed
 445          * @return Mixed
 446          * @deprecated since 1.18
 447          */
 448         function name( $x = null ) { wfDeprecated( __METHOD__, '1.18' ); return wfSetVar( $this->mName, $x ); }
 449
 450         /**
 451          * These mutators are very evil, as the relevant variables should not mutate.  So
 452          * don't use them.
 453          * @param $x Mixed
 454          * @return Mixed
 455          * @deprecated since 1.18
 456          */
 457         function restriction( $x = null ) { wfDeprecated( __METHOD__, '1.18' ); return wfSetVar( $this->mRestriction, $x ); }
 458
 459         /**
 460          * These mutators are very evil, as the relevant variables should not mutate.  So
 461          * don't use them.
 462          * @param $x Mixed
 463          * @return Mixed
 464          * @deprecated since 1.18
 465          */
 466         function func( $x = null ) { wfDeprecated( __METHOD__, '1.18' ); return wfSetVar( $this->mFunction, $x ); }
 467
 468         /**
 469          * These mutators are very evil, as the relevant variables should not mutate.  So
 470          * don't use them.
 471          * @param $x Mixed
 472          * @return Mixed
 473          * @deprecated since 1.18
 474          */
 475         function file( $x = null ) { wfDeprecated( __METHOD__, '1.18' ); return wfSetVar( $this->mFile, $x ); }
 476
 477         /**
 478          * These mutators are very evil, as the relevant variables should not mutate.  So
 479          * don't use them.
 480          * @param $x Mixed
 481          * @return Mixed
 482          * @deprecated since 1.18
 483          */
 484         function includable( $x = null ) { wfDeprecated( __METHOD__, '1.18' ); return wfSetVar( $this->mIncludable, $x ); }
 485
 486         /**
 487          * Whether the special page is being evaluated via transclusion
 488          * @param $x Bool
 489          * @return Bool
 490          */
 491         function including( $x = null ) {
 492                 return wfSetVar( $this->mIncluding, $x );
 493         }
 494
 495         /**
 496          * Get the localised name of the special page
 497          */
 498         function getLocalName() {
 499                 if ( !isset( $this->mLocalName ) ) {
 500                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 501                 }
 502                 return $this->mLocalName;
 503         }
 504
 505         /**
 506          * Is this page expensive (for some definition of expensive)?
 507          * Expensive pages are disabled or cached in miser mode.  Originally used
 508          * (and still overridden) by QueryPage and subclasses, moved here so that
 509          * Special:SpecialPages can safely call it for all special pages.
 510          *
 511          * @return Boolean
 512          */
 513         public function isExpensive() {
 514                 return false;
 515         }
 516
 517         /**
 518          * Is this page cached?
 519          * Expensive pages are cached or disabled in miser mode.
 520          * Used by QueryPage and subclasses, moved here so that
 521          * Special:SpecialPages can safely call it for all special pages.
 522          *
 523          * @return Boolean
 524          * @since 1.21
 525          */
 526         public function isCached() {
 527                 return false;
 528         }
 529
 530         /**
 531          * Can be overridden by subclasses with more complicated permissions
 532          * schemes.
 533          *
 534          * @return Boolean: should the page be displayed with the restricted-access
 535          *   pages?
 536          */
 537         public function isRestricted() {
 538                 // DWIM: If all anons can do something, then it is not restricted
 539                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 540         }
 541
 542         /**
 543          * Checks if the given user (identified by an object) can execute this
 544          * special page (as defined by $mRestriction).  Can be overridden by sub-
 545          * classes with more complicated permissions schemes.
 546          *
 547          * @param $user User: the user to check
 548          * @return Boolean: does the user have permission to view the page?
 549          */
 550         public function userCanExecute( User $user ) {
 551                 return $user->isAllowed( $this->mRestriction );
 552         }
 553
 554         /**
 555          * Output an error message telling the user what access level they have to have
 556          */
 557         function displayRestrictionError() {
 558                 throw new PermissionsError( $this->mRestriction );
 559         }
 560
 561         /**
 562          * Checks if userCanExecute, and if not throws a PermissionsError
 563          *
 564          * @since 1.19
 565          */
 566         public function checkPermissions() {
 567                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 568                         $this->displayRestrictionError();
 569                 }
 570         }
 571
 572         /**
 573          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 574          *
 575          * @since 1.19
 576          * @throws ReadOnlyError
 577          */
 578         public function checkReadOnly() {
 579                 if ( wfReadOnly() ) {
 580                         throw new ReadOnlyError;
 581                 }
 582         }
 583
 584         /**
 585          * Sets headers - this should be called from the execute() method of all derived classes!
 586          */
 587         function setHeaders() {
 588                 $out = $this->getOutput();
 589                 $out->setArticleRelated( false );
 590                 $out->setRobotPolicy( "noindex,nofollow" );
 591                 $out->setPageTitle( $this->getDescription() );
 592         }
 593
 594         /**
 595          * Entry point.
 596          *
 597          * @since 1.20
 598          *
 599          * @param $subPage string|null
 600          */
 601         final public function run( $subPage ) {
 602                 /**
 603                  * Gets called before @see SpecialPage::execute.
 604                  *
 605                  * @since 1.20
 606                  *
 607                  * @param $special SpecialPage
 608                  * @param $subPage string|null
 609                  */
 610                 wfRunHooks( 'SpecialPageBeforeExecute', array( $this, $subPage ) );
 611
 612                 $this->beforeExecute( $subPage );
 613                 $this->execute( $subPage );
 614                 $this->afterExecute( $subPage );
 615
 616                 /**
 617                  * Gets called after @see SpecialPage::execute.
 618                  *
 619                  * @since 1.20
 620                  *
 621                  * @param $special SpecialPage
 622                  * @param $subPage string|null
 623                  */
 624                 wfRunHooks( 'SpecialPageAfterExecute', array( $this, $subPage ) );
 625         }
 626
 627         /**
 628          * Gets called before @see SpecialPage::execute.
 629          *
 630          * @since 1.20
 631          *
 632          * @param $subPage string|null
 633          */
 634         protected function beforeExecute( $subPage ) {
 635                 // No-op
 636         }
 637
 638         /**
 639          * Gets called after @see SpecialPage::execute.
 640          *
 641          * @since 1.20
 642          *
 643          * @param $subPage string|null
 644          */
 645         protected function afterExecute( $subPage ) {
 646                 // No-op
 647         }
 648
 649         /**
 650          * Default execute method
 651          * Checks user permissions, calls the function given in mFunction
 652          *
 653          * This must be overridden by subclasses; it will be made abstract in a future version
 654          *
 655          * @param $subPage string|null
 656          */
 657         public function execute( $subPage ) {
 658                 $this->setHeaders();
 659                 $this->checkPermissions();
 660
 661                 $func = $this->mFunction;
 662                 // only load file if the function does not exist
 663                 if ( !is_callable( $func ) && $this->mFile ) {
 664                         require_once( $this->mFile );
 665                 }
 666                 $this->outputHeader();
 667                 call_user_func( $func, $subPage, $this );
 668         }
 669
 670         /**
 671          * Outputs a summary message on top of special pages
 672          * Per default the message key is the canonical name of the special page
 673          * May be overridden, i.e. by extensions to stick with the naming conventions
 674          * for message keys: 'extensionname-xxx'
 675          *
 676          * @param string $summaryMessageKey message key of the summary
 677          */
 678         function outputHeader( $summaryMessageKey = '' ) {
 679                 global $wgContLang;
 680
 681                 if ( $summaryMessageKey == '' ) {
 682                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 683                 } else {
 684                         $msg = $summaryMessageKey;
 685                 }
 686                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 687                         $this->getOutput()->wrapWikiMsg(
 688                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 689                 }
 690
 691         }
 692
 693         /**
 694          * Returns the name that goes in the \<h1\> in the special page itself, and
 695          * also the name that will be listed in Special:Specialpages
 696          *
 697          * Derived classes can override this, but usually it is easier to keep the
 698          * default behavior. Messages can be added at run-time, see
 699          * MessageCache.php.
 700          *
 701          * @return String
 702          */
 703         function getDescription() {
 704                 return $this->msg( strtolower( $this->mName ) )->text();
 705         }
 706
 707         /**
 708          * Get a self-referential title object
 709          *
 710          * @param $subpage String|Bool
 711          * @return Title object
 712          */
 713         function getTitle( $subpage = false ) {
 714                 return self::getTitleFor( $this->mName, $subpage );
 715         }
 716
 717         /**
 718          * Sets the context this SpecialPage is executed in
 719          *
 720          * @param $context IContextSource
 721          * @since 1.18
 722          */
 723         public function setContext( $context ) {
 724                 $this->mContext = $context;
 725         }
 726
 727         /**
 728          * Gets the context this SpecialPage is executed in
 729          *
 730          * @return IContextSource|RequestContext
 731          * @since 1.18
 732          */
 733         public function getContext() {
 734                 if ( $this->mContext instanceof IContextSource ) {
 735                         return $this->mContext;
 736                 } else {
 737                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
 738                         return RequestContext::getMain();
 739                 }
 740         }
 741
 742         /**
 743          * Get the WebRequest being used for this instance
 744          *
 745          * @return WebRequest
 746          * @since 1.18
 747          */
 748         public function getRequest() {
 749                 return $this->getContext()->getRequest();
 750         }
 751
 752         /**
 753          * Get the OutputPage being used for this instance
 754          *
 755          * @return OutputPage
 756          * @since 1.18
 757          */
 758         public function getOutput() {
 759                 return $this->getContext()->getOutput();
 760         }
 761
 762         /**
 763          * Shortcut to get the User executing this instance
 764          *
 765          * @return User
 766          * @since 1.18
 767          */
 768         public function getUser() {
 769                 return $this->getContext()->getUser();
 770         }
 771
 772         /**
 773          * Shortcut to get the skin being used for this instance
 774          *
 775          * @return Skin
 776          * @since 1.18
 777          */
 778         public function getSkin() {
 779                 return $this->getContext()->getSkin();
 780         }
 781
 782         /**
 783          * Shortcut to get user's language
 784          *
 785          * @deprecated 1.19 Use getLanguage instead
 786          * @return Language
 787          * @since 1.18
 788          */
 789         public function getLang() {
 790                 wfDeprecated( __METHOD__, '1.19' );
 791                 return $this->getLanguage();
 792         }
 793
 794         /**
 795          * Shortcut to get user's language
 796          *
 797          * @return Language
 798          * @since 1.19
 799          */
 800         public function getLanguage() {
 801                 return $this->getContext()->getLanguage();
 802         }
 803
 804         /**
 805          * Return the full title, including $par
 806          *
 807          * @return Title
 808          * @since 1.18
 809          */
 810         public function getFullTitle() {
 811                 return $this->getContext()->getTitle();
 812         }
 813
 814         /**
 815          * Wrapper around wfMessage that sets the current context.
 816          *
 817          * @return Message
 818          * @see wfMessage
 819          */
 820         public function msg( /* $args */ ) {
 821                 // Note: can't use func_get_args() directly as second or later item in
 822                 // a parameter list until PHP 5.3 or you get a fatal error.
 823                 // Works fine as the first parameter, which appears elsewhere in the
 824                 // code base. Sighhhh.
 825                 $args = func_get_args();
 826                 $message = call_user_func_array( array( $this->getContext(), 'msg' ), $args );
 827                 // RequestContext passes context to wfMessage, and the language is set from
 828                 // the context, but setting the language for Message class removes the
 829                 // interface message status, which breaks for example usernameless gender
 830                 // invocations. Restore the flag when not including special page in content.
 831                 if ( $this->including() ) {
 832                         $message->setInterfaceMessageFlag( false );
 833                 }
 834                 return $message;
 835         }
 836
 837         /**
 838          * Adds RSS/atom links
 839          *
 840          * @param $params array
 841          */
 842         protected function addFeedLinks( $params ) {
 843                 global $wgFeedClasses;
 844
 845                 $feedTemplate = wfScript( 'api' ) . '?';
 846
 847                 foreach ( $wgFeedClasses as $format => $class ) {
 848                         $theseParams = $params + array( 'feedformat' => $format );
 849                         $url = $feedTemplate . wfArrayToCgi( $theseParams );
 850                         $this->getOutput()->addFeedLink( $format, $url );
 851                 }
 852         }
 853
 854         /**
 855          * Get the group that the special page belongs in on Special:SpecialPage
 856          * Use this method, instead of getGroupName to allow customization
 857          * of the group name from the wiki side
 858          *
 859          * @return string Group of this special page
 860          * @since 1.21
 861          */
 862         public function getFinalGroupName() {
 863                 global $wgSpecialPageGroups;
 864                 $name = $this->getName();
 865                 $group = '-';
 866
 867                 // Allow overbidding the group from the wiki side
 868                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 869                 if ( !$msg->isBlank() ) {
 870                         $group = $msg->text();
 871                 } else {
 872                         // Than use the group from this object
 873                         $group = $this->getGroupName();
 874
 875                         // Group '-' is used as default to have the chance to determine,
 876                         // if the special pages overrides this method,
 877                         // if not overridden, $wgSpecialPageGroups is checked for b/c
 878                         if ( $group === '-' && isset( $wgSpecialPageGroups[$name] ) ) {
 879                                 $group = $wgSpecialPageGroups[$name];
 880                         }
 881                 }
 882
 883                 // never give '-' back, change to 'other'
 884                 if ( $group === '-' ) {
 885                         $group = 'other';
 886                 }
 887
 888                 return $group;
 889         }
 890
 891         /**
 892          * Under which header this special page is listed in Special:SpecialPages
 893          * See messages 'specialpages-group-*' for valid names
 894          * This method defaults to group 'other'
 895          *
 896          * @return string
 897          * @since 1.21
 898          */
 899         protected function getGroupName() {
 900                 // '-' used here to determine, if this group is overridden or has a hardcoded 'other'
 901                 // Needed for b/c in getFinalGroupName
 902                 return '-';
 903         }
 904 }
 905
 906 /**
 907  * Special page which uses an HTMLForm to handle processing.  This is mostly a
 908  * clone of FormAction.  More special pages should be built this way; maybe this could be
 909  * a new structure for SpecialPages
 910  */
 911 abstract class FormSpecialPage extends SpecialPage {
 912
 913         /**
 914          * Get an HTMLForm descriptor array
 915          * @return Array
 916          */
 917         abstract protected function getFormFields();
 918
 919         /**
 920          * Add pre- or post-text to the form
 921          * @return String HTML which will be sent to $form->addPreText()
 922          */
 923         protected function preText() { return ''; }
 924         protected function postText() { return ''; }
 925
 926         /**
 927          * Play with the HTMLForm if you need to more substantially
 928          * @param $form HTMLForm
 929          */
 930         protected function alterForm( HTMLForm $form ) {}
 931
 932         /**
 933          * Get message prefix for HTMLForm
 934          *
 935          * @since 1.21
 936          * @return string
 937          */
 938         protected function getMessagePrefix() {
 939                 return strtolower( $this->getName() );
 940         }
 941
 942         /**
 943          * Get the HTMLForm to control behavior
 944          * @return HTMLForm|null
 945          */
 946         protected function getForm() {
 947                 $this->fields = $this->getFormFields();
 948
 949                 $form = new HTMLForm( $this->fields, $this->getContext(), $this->getMessagePrefix() );
 950                 $form->setSubmitCallback( array( $this, 'onSubmit' ) );
 951                 $form->setWrapperLegendMsg( $this->getMessagePrefix() . '-legend' );
 952                 $form->addHeaderText(
 953                         $this->msg( $this->getMessagePrefix() . '-text' )->parseAsBlock() );
 954
 955                 // Retain query parameters (uselang etc)
 956                 $params = array_diff_key(
 957                         $this->getRequest()->getQueryValues(), array( 'title' => null ) );
 958                 $form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
 959
 960                 $form->addPreText( $this->preText() );
 961                 $form->addPostText( $this->postText() );
 962                 $this->alterForm( $form );
 963
 964                 // Give hooks a chance to alter the form, adding extra fields or text etc
 965                 wfRunHooks( "Special{$this->getName()}BeforeFormDisplay", array( &$form ) );
 966
 967                 return $form;
 968         }
 969
 970         /**
 971          * Process the form on POST submission.
 972          * @param  $data Array
 973          * @return Bool|Array true for success, false for didn't-try, array of errors on failure
 974          */
 975         abstract public function onSubmit( array $data );
 976
 977         /**
 978          * Do something exciting on successful processing of the form, most likely to show a
 979          * confirmation message
 980          */
 981         abstract public function onSuccess();
 982
 983         /**
 984          * Basic SpecialPage workflow: get a form, send it to the user; get some data back,
 985          *
 986          * @param string $par Subpage string if one was specified
 987          */
 988         public function execute( $par ) {
 989                 $this->setParameter( $par );
 990                 $this->setHeaders();
 991
 992                 // This will throw exceptions if there's a problem
 993                 $this->checkExecutePermissions( $this->getUser() );
 994
 995                 $form = $this->getForm();
 996                 if ( $form->show() ) {
 997                         $this->onSuccess();
 998                 }
 999         }
1000
1001         /**
1002          * Maybe do something interesting with the subpage parameter
1003          * @param $par String
1004          */
1005         protected function setParameter( $par ) {}
1006
1007         /**
1008          * Called from execute() to check if the given user can perform this action.
1009          * Failures here must throw subclasses of ErrorPageError.
1010          * @param $user User
1011          * @throws UserBlockedError
1012          * @return Bool true
1013          */
1014         protected function checkExecutePermissions( User $user ) {
1015                 $this->checkPermissions();
1016
1017                 if ( $this->requiresUnblock() && $user->isBlocked() ) {
1018                         $block = $user->getBlock();
1019                         throw new UserBlockedError( $block );
1020                 }
1021
1022                 if ( $this->requiresWrite() ) {
1023                         $this->checkReadOnly();
1024                 }
1025
1026                 return true;
1027         }
1028
1029         /**
1030          * Whether this action requires the wiki not to be locked
1031          * @return Bool
1032          */
1033         public function requiresWrite() {
1034                 return true;
1035         }
1036
1037         /**
1038          * Whether this action cannot be executed by a blocked user
1039          * @return Bool
1040          */
1041         public function requiresUnblock() {
1042                 return true;
1043         }
1044 }
1045
1046 /**
1047  * Shortcut to construct a special page which is unlisted by default
1048  * @ingroup SpecialPage
1049  */
1050 class UnlistedSpecialPage extends SpecialPage {
1051         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
1052                 parent::__construct( $name, $restriction, false, $function, $file );
1053         }
1054
1055         public function isListed() {
1056                 return false;
1057         }
1058 }
1059
1060 /**
1061  * Shortcut to construct an includable special  page
1062  * @ingroup SpecialPage
1063  */
1064 class IncludableSpecialPage extends SpecialPage {
1065         function __construct(
1066                 $name, $restriction = '', $listed = true, $function = false, $file = 'default'
1067         ) {
1068                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
1069         }
1070
1071         public function isIncludable() {
1072                 return true;
1073         }
1074 }
1075
1076 /**
1077  * Shortcut to construct a special page alias.
1078  * @ingroup SpecialPage
1079  */
1080 abstract class RedirectSpecialPage extends UnlistedSpecialPage {
1081
1082         // Query parameters that can be passed through redirects
1083         protected $mAllowedRedirectParams = array();
1084
1085         // Query parameters added by redirects
1086         protected $mAddedRedirectParams = array();
1087
1088         public function execute( $par ) {
1089                 $redirect = $this->getRedirect( $par );
1090                 $query = $this->getRedirectQuery();
1091                 // Redirect to a page title with possible query parameters
1092                 if ( $redirect instanceof Title ) {
1093                         $url = $redirect->getFullURL( $query );
1094                         $this->getOutput()->redirect( $url );
1095                         return $redirect;
1096                 // Redirect to index.php with query parameters
1097                 } elseif ( $redirect === true ) {
1098                         global $wgScript;
1099                         $url = $wgScript . '?' . wfArrayToCgi( $query );
1100                         $this->getOutput()->redirect( $url );
1101                         return $redirect;
1102                 } else {
1103                         $class = get_class( $this );
1104                         throw new MWException( "RedirectSpecialPage $class doesn't redirect!" );
1105                 }
1106         }
1107
1108         /**
1109          * If the special page is a redirect, then get the Title object it redirects to.
1110          * False otherwise.
1111          *
1112          * @param string $par Subpage string
1113          * @return Title|bool
1114          */
1115         abstract public function getRedirect( $par );
1116
1117         /**
1118          * Return part of the request string for a special redirect page
1119          * This allows passing, e.g. action=history to Special:Mypage, etc.
1120          *
1121          * @return String
1122          */
1123         public function getRedirectQuery() {
1124                 $params = array();
1125
1126                 foreach ( $this->mAllowedRedirectParams as $arg ) {
1127                         if ( $this->getRequest()->getVal( $arg, null ) !== null ) {
1128                                 $params[$arg] = $this->getRequest()->getVal( $arg );
1129                         }
1130                 }
1131
1132                 foreach ( $this->mAddedRedirectParams as $arg => $val ) {
1133                         $params[$arg] = $val;
1134                 }
1135
1136                 return count( $params )
1137                         ? $params
1138                         : false;
1139         }
1140 }
1141
1142 abstract class SpecialRedirectToSpecial extends RedirectSpecialPage {
1143         var $redirName, $redirSubpage;
1144
1145         function __construct(
1146                 $name, $redirName, $redirSubpage = false,
1147                 $allowedRedirectParams = array(), $addedRedirectParams = array()
1148         ) {
1149                 parent::__construct( $name );
1150                 $this->redirName = $redirName;
1151                 $this->redirSubpage = $redirSubpage;
1152                 $this->mAllowedRedirectParams = $allowedRedirectParams;
1153                 $this->mAddedRedirectParams = $addedRedirectParams;
1154         }
1155
1156         public function getRedirect( $subpage ) {
1157                 if ( $this->redirSubpage === false ) {
1158                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
1159                 } else {
1160                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
1161                 }
1162         }
1163 }
1164
1165 /**
1166  * ListAdmins --> ListUsers/sysop
1167  */
1168 class SpecialListAdmins extends SpecialRedirectToSpecial {
1169         function __construct() {
1170                 parent::__construct( 'Listadmins', 'Listusers', 'sysop' );
1171         }
1172 }
1173
1174 /**
1175  * ListBots --> ListUsers/bot
1176  */
1177 class SpecialListBots extends SpecialRedirectToSpecial {
1178         function __construct() {
1179                 parent::__construct( 'Listbots', 'Listusers', 'bot' );
1180         }
1181 }
1182
1183 /**
1184  * CreateAccount --> UserLogin/signup
1185  * @todo FIXME: This (and the rest of the login frontend) needs to die a horrible painful death
1186  */
1187 class SpecialCreateAccount extends SpecialRedirectToSpecial {
1188         function __construct() {
1189                 parent::__construct( 'CreateAccount', 'Userlogin', 'signup', array( 'uselang' ) );
1190         }
1191 }
1192 /**
1193  * SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
1194  * are used to get user independent links pointing to the user page, talk
1195  * page and list of contributions.
1196  * This can let us cache a single copy of any generated content for all
1197  * users.
1198  */
1199
1200 /**
1201  * Superclass for any RedirectSpecialPage which redirects the user
1202  * to a particular article (as opposed to user contributions, logs, etc.).
1203  *
1204  * For security reasons these special pages are restricted to pass on
1205  * the following subset of GET parameters to the target page while
1206  * removing all others:
1207  *
1208  * - useskin, uselang, printable: to alter the appearance of the resulting page
1209  *
1210  * - redirect: allows viewing one's user page or talk page even if it is a
1211  * redirect.
1212  *
1213  * - rdfrom: allows redirecting to one's user page or talk page from an
1214  * external wiki with the "Redirect from..." notice.
1215  *
1216  * - limit, offset: Useful for linking to history of one's own user page or
1217  * user talk page. For example, this would be a link to "the last edit to your
1218  * user talk page in the year 2010":
1219  * http://en.wikipedia.org/w/index.php?title=Special:MyPage&offset=20110000000000&limit=1&action=history
1220  *
1221  * - feed: would allow linking to the current user's RSS feed for their user
1222  * talk page:
1223  * http://en.wikipedia.org/w/index.php?title=Special:MyTalk&action=history&feed=rss
1224  *
1225  * - preloadtitle: Can be used to provide a default section title for a
1226  * preloaded new comment on one's own talk page.
1227  *
1228  * - summary : Can be used to provide a default edit summary for a preloaded
1229  * edit to one's own user page or talk page.
1230  *
1231  * - preview: Allows showing/hiding preview on first edit regardless of user
1232  * preference, useful for preloaded edits where you know preview wouldn't be
1233  * useful.
1234  *
1235  * - internaledit, externaledit, mode: Allows forcing the use of the
1236  * internal/external editor, e.g. to force the internal editor for
1237  * short/simple preloaded edits.
1238  *
1239  * - redlink: Affects the message the user sees if their talk page/user talk
1240  * page does not currently exist. Avoids confusion for newbies with no user
1241  * pages over why they got a "permission error" following this link:
1242  * http://en.wikipedia.org/w/index.php?title=Special:MyPage&redlink=1
1243  *
1244  * - debug: determines whether the debug parameter is passed to load.php,
1245  * which disables reformatting and allows scripts to be debugged. Useful
1246  * when debugging scripts that manipulate one's own user page or talk page.
1247  *
1248  * @par Hook extension:
1249  * Extensions can add to the redirect parameters list by using the hook
1250  * RedirectSpecialArticleRedirectParams
1251  *
1252  * This hook allows extensions which add GET parameters like FlaggedRevs to
1253  * retain those parameters when redirecting using special pages.
1254  *
1255  * @par Hook extension example:
1256  * @code
1257  *      $wgHooks['RedirectSpecialArticleRedirectParams'][] =
1258  *              'MyExtensionHooks::onRedirectSpecialArticleRedirectParams';
1259  *      public static function onRedirectSpecialArticleRedirectParams( &$redirectParams ) {
1260  *              $redirectParams[] = 'stable';
1261  *              return true;
1262  *      }
1263  * @endcode
1264  * @ingroup SpecialPage
1265  */
1266 abstract class RedirectSpecialArticle extends RedirectSpecialPage {
1267         function __construct( $name ) {
1268                 parent::__construct( $name );
1269                 $redirectParams = array(
1270                         'action',
1271                         'redirect', 'rdfrom',
1272                         # Options for preloaded edits
1273                         'preload', 'editintro', 'preloadtitle', 'summary', 'nosummary',
1274                         # Options for overriding user settings
1275                         'preview', 'internaledit', 'externaledit', 'mode', 'minor', 'watchthis',
1276                         # Options for history/diffs
1277                         'section', 'oldid', 'diff', 'dir',
1278                         'limit', 'offset', 'feed',
1279                         # Misc options
1280                         'redlink', 'debug',
1281                         # Options for action=raw; missing ctype can break JS or CSS in some browsers
1282                         'ctype', 'maxage', 'smaxage',
1283                 );
1284
1285                 wfRunHooks( "RedirectSpecialArticleRedirectParams", array( &$redirectParams ) );
1286                 $this->mAllowedRedirectParams = $redirectParams;
1287         }
1288 }
1289
1290 /**
1291  * Shortcut to construct a special page pointing to current user user's page.
1292  * @ingroup SpecialPage
1293  */
1294 class SpecialMypage extends RedirectSpecialArticle {
1295         function __construct() {
1296                 parent::__construct( 'Mypage' );
1297         }
1298
1299         function getRedirect( $subpage ) {
1300                 if ( strval( $subpage ) !== '' ) {
1301                         return Title::makeTitle( NS_USER, $this->getUser()->getName() . '/' . $subpage );
1302                 } else {
1303                         return Title::makeTitle( NS_USER, $this->getUser()->getName() );
1304                 }
1305         }
1306 }
1307
1308 /**
1309  * Shortcut to construct a special page pointing to current user talk page.
1310  * @ingroup SpecialPage
1311  */
1312 class SpecialMytalk extends RedirectSpecialArticle {
1313         function __construct() {
1314                 parent::__construct( 'Mytalk' );
1315         }
1316
1317         function getRedirect( $subpage ) {
1318                 if ( strval( $subpage ) !== '' ) {
1319                         return Title::makeTitle( NS_USER_TALK, $this->getUser()->getName() . '/' . $subpage );
1320                 } else {
1321                         return Title::makeTitle( NS_USER_TALK, $this->getUser()->getName() );
1322                 }
1323         }
1324 }
1325
1326 /**
1327  * Shortcut to construct a special page pointing to current user contributions.
1328  * @ingroup SpecialPage
1329  */
1330 class SpecialMycontributions extends RedirectSpecialPage {
1331         function __construct() {
1332                 parent::__construct( 'Mycontributions' );
1333                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
1334                         'offset', 'dir', 'year', 'month', 'feed' );
1335         }
1336
1337         function getRedirect( $subpage ) {
1338                 return SpecialPage::getTitleFor( 'Contributions', $this->getUser()->getName() );
1339         }
1340 }
1341
1342 /**
1343  * Redirect to Special:Listfiles?user=$wgUser
1344  */
1345 class SpecialMyuploads extends RedirectSpecialPage {
1346         function __construct() {
1347                 parent::__construct( 'Myuploads' );
1348                 $this->mAllowedRedirectParams = array( 'limit' );
1349         }
1350
1351         function getRedirect( $subpage ) {
1352                 return SpecialPage::getTitleFor( 'Listfiles', $this->getUser()->getName() );
1353         }
1354 }
1355
1356 /**
1357  * Redirect from Special:PermanentLink/### to index.php?oldid=###
1358  */
1359 class SpecialPermanentLink extends RedirectSpecialPage {
1360         function __construct() {
1361                 parent::__construct( 'PermanentLink' );
1362                 $this->mAllowedRedirectParams = array();
1363         }
1364
1365         function getRedirect( $subpage ) {
1366                 $subpage = intval( $subpage );
1367                 if ( $subpage === 0 ) {
1368                         # throw an error page when no subpage was given
1369                         throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
1370                 }
1371                 $this->mAddedRedirectParams['oldid'] = $subpage;
1372                 return true;
1373         }
1374 }