includes/SpecialPage.php

   1 <?php
   2 /**
   3  * SpecialPage: handling special pages and lists thereof.
   4  *
   5  * To add a special page in an extension, add to $wgSpecialPages either
   6  * an object instance or an array containing the name and constructor
   7  * parameters. The latter is preferred for performance reasons.
   8  *
   9  * The object instantiated must be either an instance of SpecialPage or a
  10  * sub-class thereof. It must have an execute() method, which sends the HTML
  11  * for the special page to $wgOut. The parent class has an execute() method
  12  * which distributes the call to the historical global functions. Additionally,
  13  * execute() also checks if the user has the necessary access privileges
  14  * and bails out if not.
  15  *
  16  * To add a core special page, use the similar static list in
  17  * SpecialPage::$mList. To remove a core static special page at runtime, use
  18  * a SpecialPage_initList hook.
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @defgroup SpecialPage SpecialPage
  23  */
  24
  25 /**
  26  * Parent special page class, also static functions for handling the special
  27  * page list.
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialPage {
  31
  32         // The canonical name of this special page
  33         // Also used for the default <h1> heading, @see getDescription()
  34         /*private*/ var $mName;
  35
  36         // The local name of this special page
  37         private $mLocalName;
  38
  39         // Minimum user level required to access this page, or "" for anyone.
  40         // Also used to categorise the pages in Special:Specialpages
  41         private $mRestriction;
  42
  43         // Listed in Special:Specialpages?
  44         private $mListed;
  45
  46         // Function name called by the default execute()
  47         private $mFunction;
  48
  49         // File which needs to be included before the function above can be called
  50         private $mFile;
  51
  52         // Whether or not this special page is being included from an article
  53         protected $mIncluding;
  54
  55         // Whether the special page can be included in an article
  56         protected $mIncludable;
  57
  58         /**
  59          * Current request context
  60          * @var RequestContext
  61          */
  62         protected $mContext;
  63
  64         /**
  65          * Initialise the special page list
  66          * This must be called before accessing SpecialPage::$mList
  67          * @deprecated since 1.18
  68          */
  69         static function initList() {
  70                 // Noop
  71         }
  72
  73         /**
  74          * @deprecated since 1.18
  75          */
  76         static function initAliasList() {
  77                 // Noop
  78         }
  79
  80         /**
  81          * Given a special page alias, return the special page name.
  82          * Returns false if there is no such alias.
  83          *
  84          * @param $alias String
  85          * @return String or false
  86          * @deprecated since 1.18 call SpecialPageFactory method directly
  87          */
  88         static function resolveAlias( $alias ) {
  89                 list( $name, /*...*/ ) = SpecialPageFactory::resolveAlias( $alias );
  90                 return $name;
  91         }
  92
  93         /**
  94          * Given a special page name with a possible subpage, return an array
  95          * where the first element is the special page name and the second is the
  96          * subpage.
  97          *
  98          * @param $alias String
  99          * @return Array
 100          * @deprecated since 1.18 call SpecialPageFactory method directly
 101          */
 102         static function resolveAliasWithSubpage( $alias ) {
 103                 return SpecialPageFactory::resolveAlias( $alias );
 104         }
 105
 106         /**
 107          * Add a page to the list of valid special pages. This used to be the preferred
 108          * method for adding special pages in extensions. It's now suggested that you add
 109          * an associative record to $wgSpecialPages. This avoids autoloading SpecialPage.
 110          *
 111          * @param $page SpecialPage
 112          * @deprecated in 1.7, warnings in 1.17, might be removed in 1.20
 113          */
 114         static function addPage( &$page ) {
 115                 wfDeprecated( __METHOD__ );
 116                 SpecialPageFactory::getList()->{$page->mName} = $page;
 117         }
 118
 119         /**
 120          * Add a page to a certain display group for Special:SpecialPages
 121          *
 122          * @param $page Mixed: SpecialPage or string
 123          * @param $group String
 124          * @deprecated since 1.18 call SpecialPageFactory method directly
 125          */
 126         static function setGroup( $page, $group ) {
 127                 return SpecialPageFactory::setGroup( $page, $group );
 128         }
 129
 130         /**
 131          * Add a page to a certain display group for Special:SpecialPages
 132          *
 133          * @param $page SpecialPage
 134          * @deprecated since 1.18 call SpecialPageFactory method directly
 135          */
 136         static function getGroup( &$page ) {
 137                 return SpecialPageFactory::getGroup( $page );
 138         }
 139
 140         /**
 141          * Remove a special page from the list
 142          * Formerly used to disable expensive or dangerous special pages. The
 143          * preferred method is now to add a SpecialPage_initList hook.
 144          * @deprecated since 1.18
 145          */
 146         static function removePage( $name ) {
 147                 unset( SpecialPageFactory::getList()->$name );
 148         }
 149
 150         /**
 151          * Check if a given name exist as a special page or as a special page alias
 152          *
 153          * @param $name String: name of a special page
 154          * @return Boolean: true if a special page exists with this name
 155          * @deprecated since 1.18 call SpecialPageFactory method directly
 156          */
 157         static function exists( $name ) {
 158                 return SpecialPageFactory::exists( $name );
 159         }
 160
 161         /**
 162          * Find the object with a given name and return it (or NULL)
 163          *
 164          * @param $name String
 165          * @return SpecialPage object or null if the page doesn't exist
 166          * @deprecated since 1.18 call SpecialPageFactory method directly
 167          */
 168         static function getPage( $name ) {
 169                 return SpecialPageFactory::getPage( $name );
 170         }
 171
 172         /**
 173          * Get a special page with a given localised name, or NULL if there
 174          * is no such special page.
 175          *
 176          * @return SpecialPage object or null if the page doesn't exist
 177          * @deprecated since 1.18 call SpecialPageFactory method directly
 178          */
 179         static function getPageByAlias( $alias ) {
 180                 return SpecialPageFactory::getPage( $alias );
 181         }
 182
 183         /**
 184          * Return categorised listable special pages which are available
 185          * for the current user, and everyone.
 186          *
 187          * @return Associative array mapping page's name to its SpecialPage object
 188          * @deprecated since 1.18 call SpecialPageFactory method directly
 189          */
 190         static function getUsablePages() {
 191                 return SpecialPageFactory::getUsablePages();
 192         }
 193
 194         /**
 195          * Return categorised listable special pages for all users
 196          *
 197          * @return Associative array mapping page's name to its SpecialPage object
 198          * @deprecated since 1.18 call SpecialPageFactory method directly
 199          */
 200         static function getRegularPages() {
 201                 return SpecialPageFactory::getRegularPages();
 202         }
 203
 204         /**
 205          * Return categorised listable special pages which are available
 206          * for the current user, but not for everyone
 207          *
 208          * @return Associative array mapping page's name to its SpecialPage object
 209          * @deprecated since 1.18 call SpecialPageFactory method directly
 210          */
 211         static function getRestrictedPages() {
 212                 return SpecialPageFactory::getRestrictedPages();
 213         }
 214
 215         /**
 216          * Execute a special page path.
 217          * The path may contain parameters, e.g. Special:Name/Params
 218          * Extracts the special page name and call the execute method, passing the parameters
 219          *
 220          * Returns a title object if the page is redirected, false if there was no such special
 221          * page, and true if it was successful.
 222          *
 223          * @param $title          Title object
 224          * @param $context        RequestContext
 225          * @param $including      Bool output is being captured for use in {{special:whatever}}
 226          * @deprecated since 1.18 call SpecialPageFactory method directly
 227          */
 228         public static function executePath( &$title, RequestContext &$context, $including = false ) {
 229                 return SpecialPageFactory::executePath( $title, $context, $including );
 230         }
 231
 232         /**
 233          * Just like executePath() except it returns the HTML instead of outputting it
 234          * Returns false if there was no such special page, or a title object if it was
 235          * a redirect.
 236          *
 237          * @return String: HTML fragment
 238          * @deprecated since 1.18 call SpecialPageFactory method directly
 239          */
 240         static function capturePath( &$title ) {
 241                 return SpecialPageFactory::capturePath( $title );
 242         }
 243
 244         /**
 245          * Get the local name for a specified canonical name
 246          *
 247          * @param $name String
 248          * @param $subpage Mixed: boolean false, or string
 249          *
 250          * @return String
 251          * @deprecated since 1.18 call SpecialPageFactory method directly
 252          */
 253         static function getLocalNameFor( $name, $subpage = false ) {
 254                 return SpecialPageFactory::getLocalNameFor( $name, $subpage );
 255         }
 256
 257         /**
 258          * Get a localised Title object for a specified special page name
 259          *
 260          * @return Title object
 261          */
 262         public static function getTitleFor( $name, $subpage = false ) {
 263                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
 264                 if ( $name ) {
 265                         return Title::makeTitle( NS_SPECIAL, $name );
 266                 } else {
 267                         throw new MWException( "Invalid special page name \"$name\"" );
 268                 }
 269         }
 270
 271         /**
 272          * Get a localised Title object for a page name with a possibly unvalidated subpage
 273          *
 274          * @return Title object or null if the page doesn't exist
 275          */
 276         public static function getSafeTitleFor( $name, $subpage = false ) {
 277                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
 278                 if ( $name ) {
 279                         return Title::makeTitleSafe( NS_SPECIAL, $name );
 280                 } else {
 281                         return null;
 282                 }
 283         }
 284
 285         /**
 286          * Get a title for a given alias
 287          *
 288          * @return Title or null if there is no such alias
 289          * @deprecated since 1.18 call SpecialPageFactory method directly
 290          */
 291         static function getTitleForAlias( $alias ) {
 292                 return SpecialPageFactory::getTitleForAlias( $alias );
 293         }
 294
 295         /**
 296          * Default constructor for special pages
 297          * Derivative classes should call this from their constructor
 298          *     Note that if the user does not have the required level, an error message will
 299          *     be displayed by the default execute() method, without the global function ever
 300          *     being called.
 301          *
 302          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 303          *     and displayRestrictionError()
 304          *
 305          * @param $name String: name of the special page, as seen in links and URLs
 306          * @param $restriction String: user right required, e.g. "block" or "delete"
 307          * @param $listed Boolean: whether the page is listed in Special:Specialpages
 308          * @param $function Callback: function called by execute(). By default it is constructed from $name
 309          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 310          * @param $includable Boolean: whether the page can be included in normal pages
 311          */
 312         public function __construct( $name = '', $restriction = '', $listed = true, $function = false, $file = 'default', $includable = false ) {
 313                 $this->init( $name, $restriction, $listed, $function, $file, $includable );
 314         }
 315
 316         /**
 317          * Do the real work for the constructor, mainly so __call() can intercept
 318          * calls to SpecialPage()
 319          * @see __construct() for param docs
 320          */
 321         private function init( $name, $restriction, $listed, $function, $file, $includable ) {
 322                 $this->mName = $name;
 323                 $this->mRestriction = $restriction;
 324                 $this->mListed = $listed;
 325                 $this->mIncludable = $includable;
 326                 if ( !$function ) {
 327                         $this->mFunction = 'wfSpecial'.$name;
 328                 } else {
 329                         $this->mFunction = $function;
 330                 }
 331                 if ( $file === 'default' ) {
 332                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 333                 } else {
 334                         $this->mFile = $file;
 335                 }
 336         }
 337
 338         /**
 339          * Use PHP's magic __call handler to get calls to the old PHP4 constructor
 340          * because PHP E_STRICT yells at you for having __construct() and SpecialPage()
 341          *
 342          * @param $fName String Name of called method
 343          * @param $a Array Arguments to the method
 344          * @deprecated since 1.17, call parent::__construct()
 345          */
 346         public function __call( $fName, $a ) {
 347                 // Sometimes $fName is SpecialPage, sometimes it's specialpage. <3 PHP
 348                 if( strtolower( $fName ) == 'specialpage' ) {
 349                         // Deprecated messages now, remove in 1.19 or 1.20?
 350                         wfDeprecated( __METHOD__ );
 351
 352                         $name = isset( $a[0] ) ? $a[0] : '';
 353                         $restriction = isset( $a[1] ) ? $a[1] : '';
 354                         $listed = isset( $a[2] ) ? $a[2] : true;
 355                         $function = isset( $a[3] ) ? $a[3] : false;
 356                         $file = isset( $a[4] ) ? $a[4] : 'default';
 357                         $includable = isset( $a[5] ) ? $a[5] : false;
 358                         $this->init( $name, $restriction, $listed, $function, $file, $includable );
 359                 } else {
 360                         $className = get_class( $this );
 361                         throw new MWException( "Call to undefined method $className::$fName" );
 362                 }
 363         }
 364
 365         /**
 366          * Get the name of this Special Page.
 367          * @return String
 368          */
 369         function getName() {
 370                 return $this->mName;
 371         }
 372
 373         /**
 374          * Get the permission that a user must have to execute this page
 375          * @return String
 376          */
 377         function getRestriction() {
 378                 return $this->mRestriction;
 379         }
 380
 381         /**
 382          * Get the file which will be included by SpecialPage::execute() if your extension is
 383          * still stuck in the past and hasn't overridden the execute() method.  No modern code
 384          * should want or need to know this.
 385          * @return String
 386          * @deprecated since 1.18
 387          */
 388         function getFile() {
 389                 return $this->mFile;
 390         }
 391
 392         // FIXME: decide which syntax to use for this, and stick to it
 393         /**
 394          * Whether this special page is listed in Special:SpecialPages
 395          * @since r3583 (v1.3)
 396          * @return Bool
 397          */
 398         function isListed() {
 399                 return $this->mListed;
 400         }
 401         /**
 402          * Set whether this page is listed in Special:Specialpages, at run-time
 403          * @since r3583 (v1.3)
 404          * @return Bool
 405          */
 406         function setListed( $listed ) {
 407                 return wfSetVar( $this->mListed, $listed );
 408         }
 409         /**
 410          * Get or set whether this special page is listed in Special:SpecialPages
 411          * @since r11308 (v1.6)
 412          * @return Bool
 413          */
 414         function listed( $x = null) {
 415                 return wfSetVar( $this->mListed, $x );
 416         }
 417
 418         /**
 419          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 420          * @return Bool
 421          */
 422         public function isIncludable(){
 423                 return $this->mIncludable;
 424         }
 425
 426         /**
 427          * These mutators are very evil, as the relevant variables should not mutate.  So
 428          * don't use them.
 429          * @deprecated since 1.18
 430          */
 431         function name( $x = null ) { return wfSetVar( $this->mName, $x ); }
 432         function restriction( $x = null) { return wfSetVar( $this->mRestriction, $x ); }
 433         function func( $x = null) { return wfSetVar( $this->mFunction, $x ); }
 434         function file( $x = null) { return wfSetVar( $this->mFile, $x ); }
 435         function includable( $x = null ) { return wfSetVar( $this->mIncludable, $x ); }
 436
 437         /**
 438          * Whether the special page is being evaluated via transclusion
 439          * @return Bool
 440          */
 441         function including( $x = null ) {
 442                 return wfSetVar( $this->mIncluding, $x );
 443         }
 444
 445         /**
 446          * Get the localised name of the special page
 447          */
 448         function getLocalName() {
 449                 if ( !isset( $this->mLocalName ) ) {
 450                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 451                 }
 452                 return $this->mLocalName;
 453         }
 454
 455         /**
 456          * Is this page expensive (for some definition of expensive)?
 457          * Expensive pages are disabled or cached in miser mode.  Originally used
 458          * (and still overridden) by QueryPage and subclasses, moved here so that
 459          * Special:SpecialPages can safely call it for all special pages.
 460          *
 461          * @return Boolean
 462          */
 463         public function isExpensive() {
 464                 return false;
 465         }
 466
 467         /**
 468          * Can be overridden by subclasses with more complicated permissions
 469          * schemes.
 470          *
 471          * @return Boolean: should the page be displayed with the restricted-access
 472          *   pages?
 473          */
 474         public function isRestricted() {
 475                 global $wgGroupPermissions;
 476                 // DWIM: If all anons can do something, then it is not restricted
 477                 return $this->mRestriction != '' && empty($wgGroupPermissions['*'][$this->mRestriction]);
 478         }
 479
 480         /**
 481          * Checks if the given user (identified by an object) can execute this
 482          * special page (as defined by $mRestriction).  Can be overridden by sub-
 483          * classes with more complicated permissions schemes.
 484          *
 485          * @param $user User: the user to check
 486          * @return Boolean: does the user have permission to view the page?
 487          */
 488         public function userCanExecute( User $user ) {
 489                 return $user->isAllowed( $this->mRestriction );
 490         }
 491
 492         /**
 493          * Output an error message telling the user what access level they have to have
 494          */
 495         function displayRestrictionError() {
 496                 throw new PermissionsError( $this->mRestriction );
 497         }
 498
 499         /**
 500          * Sets headers - this should be called from the execute() method of all derived classes!
 501          */
 502         function setHeaders() {
 503                 $out = $this->getOutput();
 504                 $out->setArticleRelated( false );
 505                 $out->setRobotPolicy( "noindex,nofollow" );
 506                 $out->setPageTitle( $this->getDescription() );
 507         }
 508
 509         /**
 510          * Default execute method
 511          * Checks user permissions, calls the function given in mFunction
 512          *
 513          * This must be overridden by subclasses; it will be made abstract in a future version
 514          */
 515         function execute( $par ) {
 516                 $this->setHeaders();
 517
 518                 if ( $this->userCanExecute( $this->getUser() ) ) {
 519                         $func = $this->mFunction;
 520                         // only load file if the function does not exist
 521                         if(!is_callable($func) and $this->mFile) {
 522                                 require_once( $this->mFile );
 523                         }
 524                         $this->outputHeader();
 525                         call_user_func( $func, $par, $this );
 526                 } else {
 527                         $this->displayRestrictionError();
 528                 }
 529         }
 530
 531         /**
 532          * Outputs a summary message on top of special pages
 533          * Per default the message key is the canonical name of the special page
 534          * May be overriden, i.e. by extensions to stick with the naming conventions
 535          * for message keys: 'extensionname-xxx'
 536          *
 537          * @param $summaryMessageKey String: message key of the summary
 538          */
 539         function outputHeader( $summaryMessageKey = '' ) {
 540                 global $wgContLang;
 541
 542                 if( $summaryMessageKey == '' ) {
 543                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 544                 } else {
 545                         $msg = $summaryMessageKey;
 546                 }
 547                 if ( !wfMessage( $msg )->isBlank() and ! $this->including() ) {
 548                         $this->getOutput()->wrapWikiMsg( "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 549                 }
 550
 551         }
 552
 553         /**
 554          * Returns the name that goes in the \<h1\> in the special page itself, and
 555          * also the name that will be listed in Special:Specialpages
 556          *
 557          * Derived classes can override this, but usually it is easier to keep the
 558          * default behaviour. Messages can be added at run-time, see
 559          * MessageCache.php.
 560          *
 561          * @return String
 562          */
 563         function getDescription() {
 564                 return wfMsg( strtolower( $this->mName ) );
 565         }
 566
 567         /**
 568          * Get a self-referential title object
 569          *
 570          * @return Title object
 571          */
 572         function getTitle( $subpage = false ) {
 573                 return self::getTitleFor( $this->mName, $subpage );
 574         }
 575
 576         /**
 577          * Sets the context this SpecialPage is executed in
 578          *
 579          * @param $context RequestContext
 580          * @since 1.18
 581          */
 582         public function setContext( $context ) {
 583                 $this->mContext = $context;
 584         }
 585
 586         /**
 587          * Gets the context this SpecialPage is executed in
 588          *
 589          * @return RequestContext
 590          * @since 1.18
 591          */
 592         public function getContext() {
 593                 if ( $this->mContext instanceof RequestContext ) {
 594                         return $this->mContext;
 595                 } else {
 596                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
 597                         return RequestContext::getMain();
 598                 }
 599         }
 600
 601         /**
 602          * Get the WebRequest being used for this instance
 603          *
 604          * @return WebRequest
 605          * @since 1.18
 606          */
 607         public function getRequest() {
 608                 return $this->getContext()->getRequest();
 609         }
 610
 611         /**
 612          * Get the OutputPage being used for this instance
 613          *
 614          * @return OutputPage
 615          * @since 1.18
 616          */
 617         public function getOutput() {
 618                 return $this->getContext()->getOutput();
 619         }
 620
 621         /**
 622          * Shortcut to get the skin being used for this instance
 623          *
 624          * @return User
 625          * @since 1.18
 626          */
 627         public function getUser() {
 628                 return $this->getContext()->getUser();
 629         }
 630
 631         /**
 632          * Shortcut to get the skin being used for this instance
 633          *
 634          * @return Skin
 635          * @since 1.18
 636          */
 637         public function getSkin() {
 638                 return $this->getContext()->getSkin();
 639         }
 640
 641         /**
 642          * Return the full title, including $par
 643          *
 644          * @return Title
 645          * @since 1.18
 646          */
 647         public function getFullTitle() {
 648                 return $this->getContext()->getTitle();
 649         }
 650
 651         /**
 652          * Wrapper around wfMessage that sets the current context. Currently this
 653          * is only the title.
 654          *
 655          * @see wfMessage
 656          */
 657         public function msg( /* $args */ ) {
 658                 return call_user_func_array( 'wfMessage', func_get_args() )->title( $this->getFullTitle() );
 659         }
 660 }
 661
 662 /**
 663  * Special page which uses an HTMLForm to handle processing.  This is mostly a
 664  * clone of FormAction.  More special pages should be built this way; maybe this could be
 665  * a new structure for SpecialPages
 666  */
 667 abstract class FormSpecialPage extends SpecialPage {
 668
 669         /**
 670          * Get an HTMLForm descriptor array
 671          * @return Array
 672          */
 673         protected abstract function getFormFields();
 674
 675         /**
 676          * Add pre- or post-text to the form
 677          * @return String HTML which will be sent to $form->addPreText()
 678          */
 679         protected function preText() { return ''; }
 680         protected function postText() { return ''; }
 681
 682         /**
 683          * Play with the HTMLForm if you need to more substantially
 684          * @param $form HTMLForm
 685          */
 686         protected function alterForm( HTMLForm $form ) {}
 687
 688         /**
 689          * Get the HTMLForm to control behaviour
 690          * @return HTMLForm|null
 691          */
 692         protected function getForm() {
 693                 $this->fields = $this->getFormFields();
 694
 695                 // Give hooks a chance to alter the form, adding extra fields or text etc
 696                 wfRunHooks( "Special{$this->getName()}ModifyFormFields", array( &$this->fields ) );
 697
 698                 $form = new HTMLForm( $this->fields, $this->getContext() );
 699                 $form->setSubmitCallback( array( $this, 'onSubmit' ) );
 700                 $form->setWrapperLegend( wfMessage( strtolower( $this->getName() ) . '-legend' ) );
 701                 $form->addHeaderText( wfMessage( strtolower( $this->getName() ) . '-text' )->parseAsBlock() );
 702
 703                 // Retain query parameters (uselang etc)
 704                 $params = array_diff_key( $this->getRequest()->getQueryValues(), array( 'title' => null ) );
 705                 $form->addHiddenField( 'redirectparams', wfArrayToCGI( $params ) );
 706
 707                 $form->addPreText( $this->preText() );
 708                 $form->addPostText( $this->postText() );
 709                 $this->alterForm( $form );
 710
 711                 // Give hooks a chance to alter the form, adding extra fields or text etc
 712                 wfRunHooks( "Special{$this->getName()}BeforeFormDisplay", array( &$form ) );
 713
 714                 return $form;
 715         }
 716
 717         /**
 718          * Process the form on POST submission.
 719          * @param  $data Array
 720          * @return Bool|Array true for success, false for didn't-try, array of errors on failure
 721          */
 722         public abstract function onSubmit( array $data );
 723
 724         /**
 725          * Do something exciting on successful processing of the form, most likely to show a
 726          * confirmation message
 727          */
 728         public abstract function onSuccess();
 729
 730         /**
 731          * Basic SpecialPage workflow: get a form, send it to the user; get some data back,
 732          */
 733         public function execute( $par ) {
 734                 $this->setParameter( $par );
 735                 $this->setHeaders();
 736
 737                 // This will throw exceptions if there's a problem
 738                 $this->userCanExecute( $this->getUser() );
 739
 740                 $form = $this->getForm();
 741                 if ( $form->show() ) {
 742                         $this->onSuccess();
 743                 }
 744         }
 745
 746         /**
 747          * Maybe do something interesting with the subpage parameter
 748          * @param $par String
 749          */
 750         protected function setParameter( $par ){}
 751
 752         /**
 753          * Checks if the given user (identified by an object) can perform this action.  Can be
 754          * overridden by sub-classes with more complicated permissions schemes.  Failures here
 755          * must throw subclasses of ErrorPageError
 756          *
 757          * @param $user User: the user to check, or null to use the context user
 758          * @throws ErrorPageError
 759          */
 760         public function userCanExecute( User $user ) {
 761                 if ( $this->requiresWrite() && wfReadOnly() ) {
 762                         throw new ReadOnlyError();
 763                 }
 764
 765                 if ( $this->getRestriction() !== null && !$user->isAllowed( $this->getRestriction() ) ) {
 766                         throw new PermissionsError( $this->getRestriction() );
 767                 }
 768
 769                 if ( $this->requiresUnblock() && $user->isBlocked() ) {
 770                         $block = $user->mBlock;
 771                         throw new UserBlockedError( $block );
 772                 }
 773
 774                 return true;
 775         }
 776
 777         /**
 778          * Whether this action requires the wiki not to be locked
 779          * @return Bool
 780          */
 781         public function requiresWrite() {
 782                 return true;
 783         }
 784
 785         /**
 786          * Whether this action cannot be executed by a blocked user
 787          * @return Bool
 788          */
 789         public function requiresUnblock() {
 790                 return true;
 791         }
 792 }
 793
 794 /**
 795  * Shortcut to construct a special page which is unlisted by default
 796  * @ingroup SpecialPage
 797  */
 798 class UnlistedSpecialPage extends SpecialPage
 799 {
 800         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
 801                 parent::__construct( $name, $restriction, false, $function, $file );
 802         }
 803
 804         public function isListed(){
 805                 return false;
 806         }
 807 }
 808
 809 /**
 810  * Shortcut to construct an includable special  page
 811  * @ingroup SpecialPage
 812  */
 813 class IncludableSpecialPage extends SpecialPage
 814 {
 815         function __construct( $name, $restriction = '', $listed = true, $function = false, $file = 'default' ) {
 816                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
 817         }
 818
 819         public function isIncludable(){
 820                 return true;
 821         }
 822 }
 823
 824 /**
 825  * Shortcut to construct a special page alias.
 826  * @ingroup SpecialPage
 827  */
 828 abstract class RedirectSpecialPage extends UnlistedSpecialPage {
 829
 830         // Query parameters that can be passed through redirects
 831         protected $mAllowedRedirectParams = array();
 832
 833         // Query parameteres added by redirects
 834         protected $mAddedRedirectParams = array();
 835
 836         public function execute( $par ){
 837                 $redirect = $this->getRedirect( $par );
 838                 $query = $this->getRedirectQuery();
 839                 // Redirect to a page title with possible query parameters
 840                 if ( $redirect instanceof Title ) {
 841                         $url = $redirect->getFullUrl( $query );
 842                         $this->getContext()->output->redirect( $url );
 843                         wfProfileOut( __METHOD__ );
 844                         return $redirect;
 845                 // Redirect to index.php with query parameters
 846                 } elseif ( $redirect === true ) {
 847                         global $wgScript;
 848                         $url = $wgScript . '?' . wfArrayToCGI( $query );
 849                         $this->getContext()->output->redirect( $url );
 850                         wfProfileOut( __METHOD__ );
 851                         return $redirect;
 852                 } else {
 853                         $class = __CLASS__;
 854                         throw new MWException( "RedirectSpecialPage $class doesn't redirect!" );
 855                 }
 856         }
 857
 858         /**
 859          * If the special page is a redirect, then get the Title object it redirects to.
 860          * False otherwise.
 861          *
 862          * @return Title|false
 863          */
 864         abstract public function getRedirect( $par );
 865
 866         /**
 867          * Return part of the request string for a special redirect page
 868          * This allows passing, e.g. action=history to Special:Mypage, etc.
 869          *
 870          * @return String
 871          */
 872         public function getRedirectQuery() {
 873                 $params = array();
 874
 875                 foreach( $this->mAllowedRedirectParams as $arg ) {
 876                         if( $this->getContext()->request->getVal( $arg, null ) !== null ){
 877                                 $params[$arg] = $this->getContext()->request->getVal( $arg );
 878                         }
 879                 }
 880
 881                 foreach( $this->mAddedRedirectParams as $arg => $val ) {
 882                         $params[$arg] = $val;
 883                 }
 884
 885                 return count( $params )
 886                         ? $params
 887                         : false;
 888         }
 889 }
 890
 891 abstract class SpecialRedirectToSpecial extends RedirectSpecialPage {
 892
 893         var $redirName, $redirSubpage;
 894
 895         function __construct( $name, $redirName, $redirSubpage = false, $allowedRedirectParams = array(), $addedRedirectParams = array() ) {
 896                 parent::__construct( $name );
 897                 $this->redirName = $redirName;
 898                 $this->redirSubpage = $redirSubpage;
 899                 $this->mAllowedRedirectParams = $allowedRedirectParams;
 900                 $this->mAddedRedirectParams = $addedRedirectParams;
 901         }
 902
 903         public function getRedirect( $subpage ) {
 904                 if ( $this->redirSubpage === false ) {
 905                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
 906                 } else {
 907                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
 908                 }
 909         }
 910 }
 911
 912 /**
 913  * ListAdmins --> ListUsers/admin
 914  */
 915 class SpecialListAdmins extends SpecialRedirectToSpecial {
 916         function __construct(){
 917                 parent::__construct( 'ListAdmins', 'ListUsers', 'sysop' );
 918         }
 919 }
 920
 921 /**
 922  * ListBots --> ListUsers/admin
 923  */
 924 class SpecialListBots extends SpecialRedirectToSpecial {
 925         function __construct(){
 926                 parent::__construct( 'ListAdmins', 'ListUsers', 'bot' );
 927         }
 928 }
 929
 930 /**
 931  * CreateAccount --> UserLogin/signup
 932  * FIXME: this (and the rest of the login frontend) needs to die a horrible painful death
 933  */
 934 class SpecialCreateAccount extends SpecialRedirectToSpecial {
 935         function __construct(){
 936                 parent::__construct( 'CreateAccount', 'Userlogin', 'signup', array( 'uselang' ) );
 937         }
 938 }
 939 /**
 940  * SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
 941  * are used to get user independant links pointing to the user page, talk
 942  * page and list of contributions.
 943  * This can let us cache a single copy of any generated content for all
 944  * users.
 945  */
 946
 947 /**
 948  * Shortcut to construct a special page pointing to current user user's page.
 949  * @ingroup SpecialPage
 950  */
 951 class SpecialMypage extends RedirectSpecialPage {
 952         function __construct() {
 953                 parent::__construct( 'Mypage' );
 954                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
 955                         'section', 'oldid', 'diff', 'dir' );
 956         }
 957
 958         function getRedirect( $subpage ) {
 959                 global $wgUser;
 960                 if ( strval( $subpage ) !== '' ) {
 961                         return Title::makeTitle( NS_USER, $wgUser->getName() . '/' . $subpage );
 962                 } else {
 963                         return Title::makeTitle( NS_USER, $wgUser->getName() );
 964                 }
 965         }
 966 }
 967
 968 /**
 969  * Shortcut to construct a special page pointing to current user talk page.
 970  * @ingroup SpecialPage
 971  */
 972 class SpecialMytalk extends RedirectSpecialPage {
 973         function __construct() {
 974                 parent::__construct( 'Mytalk' );
 975                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
 976                         'section', 'oldid', 'diff', 'dir' );
 977         }
 978
 979         function getRedirect( $subpage ) {
 980                 global $wgUser;
 981                 if ( strval( $subpage ) !== '' ) {
 982                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() . '/' . $subpage );
 983                 } else {
 984                         return Title::makeTitle( NS_USER_TALK, $wgUser->getName() );
 985                 }
 986         }
 987 }
 988
 989 /**
 990  * Shortcut to construct a special page pointing to current user contributions.
 991  * @ingroup SpecialPage
 992  */
 993 class SpecialMycontributions extends RedirectSpecialPage {
 994         function __construct() {
 995                 parent::__construct(  'Mycontributions' );
 996                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
 997                         'offset', 'dir', 'year', 'month', 'feed' );
 998         }
 999
1000         function getRedirect( $subpage ) {
1001                 global $wgUser;
1002                 return SpecialPage::getTitleFor( 'Contributions', $wgUser->getName() );
1003         }
1004 }
1005
1006 /**
1007  * Redirect to Special:Listfiles?user=$wgUser
1008  */
1009 class SpecialMyuploads extends RedirectSpecialPage {
1010         function __construct() {
1011                 parent::__construct( 'Myuploads' );
1012                 $this->mAllowedRedirectParams = array( 'limit' );
1013         }
1014
1015         function getRedirect( $subpage ) {
1016                 global $wgUser;
1017                 return SpecialPage::getTitleFor( 'Listfiles', $wgUser->getName() );
1018         }
1019 }
1020
1021 /**
1022  * Redirect from Special:PermanentLink/### to index.php?oldid=###
1023  */
1024 class SpecialPermanentLink extends RedirectSpecialPage {
1025         function __construct() {
1026                 parent::__construct( 'PermanentLink' );
1027                 $this->mAllowedRedirectParams = array();
1028         }
1029
1030         function getRedirect( $subpage ) {
1031                 $subpage = intval( $subpage );
1032                 $this->mAddedRedirectParams['oldid'] = $subpage;
1033                 return true;
1034         }
1035 }