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         protected $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 IContextSource
  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 $page SpecialPage
 112          * @deprecated since 1.7, warnings in 1.17, might be removed in 1.20
 113          */
 114         static function addPage( &$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          * @return null
 125          * @deprecated since 1.18 call SpecialPageFactory method directly
 126          */
 127         static function setGroup( $page, $group ) {
 128                 return SpecialPageFactory::setGroup( $page, $group );
 129         }
 130
 131         /**
 132          * Get the group that the special page belongs in on Special:SpecialPage
 133          *
 134          * @param $page SpecialPage
 135          * @return null
 136          * @deprecated since 1.18 call SpecialPageFactory method directly
 137          */
 138         static function getGroup( &$page ) {
 139                 return SpecialPageFactory::getGroup( $page );
 140         }
 141
 142         /**
 143          * Remove a special page from the list
 144          * Formerly used to disable expensive or dangerous special pages. The
 145          * preferred method is now to add a SpecialPage_initList hook.
 146          * @deprecated since 1.18
 147          *
 148          * @param $name String the page to remove
 149          */
 150         static function removePage( $name ) {
 151                 unset( SpecialPageFactory::getList()->$name );
 152         }
 153
 154         /**
 155          * Check if a given name exist as a special page or as a special page alias
 156          *
 157          * @param $name String: name of a special page
 158          * @return Boolean: true if a special page exists with this name
 159          * @deprecated since 1.18 call SpecialPageFactory method directly
 160          */
 161         static function exists( $name ) {
 162                 return SpecialPageFactory::exists( $name );
 163         }
 164
 165         /**
 166          * Find the object with a given name and return it (or NULL)
 167          *
 168          * @param $name String
 169          * @return SpecialPage object or null if the page doesn't exist
 170          * @deprecated since 1.18 call SpecialPageFactory method directly
 171          */
 172         static function getPage( $name ) {
 173                 return SpecialPageFactory::getPage( $name );
 174         }
 175
 176         /**
 177          * Get a special page with a given localised name, or NULL if there
 178          * is no such special page.
 179          *
 180          * @param $alias String
 181          * @return SpecialPage object or null if the page doesn't exist
 182          * @deprecated since 1.18 call SpecialPageFactory method directly
 183          */
 184         static function getPageByAlias( $alias ) {
 185                 return SpecialPageFactory::getPage( $alias );
 186         }
 187
 188         /**
 189          * Return categorised listable special pages which are available
 190          * for the current user, and everyone.
 191          *
 192          * @param $user User object to check permissions, $wgUser will be used
 193          *              if not provided
 194          * @return Associative array mapping page's name to its SpecialPage object
 195          * @deprecated since 1.18 call SpecialPageFactory method directly
 196          */
 197         static function getUsablePages( User $user = null ) {
 198                 return SpecialPageFactory::getUsablePages( $user );
 199         }
 200
 201         /**
 202          * Return categorised listable special pages for all users
 203          *
 204          * @return Associative array mapping page's name to its SpecialPage object
 205          * @deprecated since 1.18 call SpecialPageFactory method directly
 206          */
 207         static function getRegularPages() {
 208                 return SpecialPageFactory::getRegularPages();
 209         }
 210
 211         /**
 212          * Return categorised listable special pages which are available
 213          * for the current user, but not for everyone
 214          *
 215          * @return Associative array mapping page's name to its SpecialPage object
 216          * @deprecated since 1.18 call SpecialPageFactory method directly
 217          */
 218         static function getRestrictedPages() {
 219                 return SpecialPageFactory::getRestrictedPages();
 220         }
 221
 222         /**
 223          * Execute a special page path.
 224          * The path may contain parameters, e.g. Special:Name/Params
 225          * Extracts the special page name and call the execute method, passing the parameters
 226          *
 227          * Returns a title object if the page is redirected, false if there was no such special
 228          * page, and true if it was successful.
 229          *
 230          * @param $title          Title object
 231          * @param $context        IContextSource
 232          * @param $including      Bool output is being captured for use in {{special:whatever}}
 233          * @return Bool
 234          * @deprecated since 1.18 call SpecialPageFactory method directly
 235          */
 236         public static function executePath( &$title, IContextSource &$context, $including = false ) {
 237                 return SpecialPageFactory::executePath( $title, $context, $including );
 238         }
 239
 240         /**
 241          * Get the local name for a specified canonical name
 242          *
 243          * @param $name String
 244          * @param $subpage Mixed: boolean false, or string
 245          *
 246          * @return String
 247          * @deprecated since 1.18 call SpecialPageFactory method directly
 248          */
 249         static function getLocalNameFor( $name, $subpage = false ) {
 250                 return SpecialPageFactory::getLocalNameFor( $name, $subpage );
 251         }
 252
 253         /**
 254          * Get a localised Title object for a specified special page name
 255          *
 256          * @param $name String
 257          * @param $subpage String|Bool subpage string, or false to not use a subpage
 258          * @return Title object
 259          */
 260         public static function getTitleFor( $name, $subpage = false ) {
 261                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
 262                 if ( $name ) {
 263                         return Title::makeTitle( NS_SPECIAL, $name );
 264                 } else {
 265                         throw new MWException( "Invalid special page name \"$name\"" );
 266                 }
 267         }
 268
 269         /**
 270          * Get a localised Title object for a page name with a possibly unvalidated subpage
 271          *
 272          * @param $name String
 273          * @param $subpage String|Bool subpage string, or false to not use a subpage
 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          * @param $alias String
 289          * @return Title or null if there is no such alias
 290          * @deprecated since 1.18 call SpecialPageFactory method directly
 291          */
 292         static function getTitleForAlias( $alias ) {
 293                 return SpecialPageFactory::getTitleForAlias( $alias );
 294         }
 295
 296         /**
 297          * Default constructor for special pages
 298          * Derivative classes should call this from their constructor
 299          *     Note that if the user does not have the required level, an error message will
 300          *     be displayed by the default execute() method, without the global function ever
 301          *     being called.
 302          *
 303          *     If you override execute(), you can recover the default behaviour with userCanExecute()
 304          *     and displayRestrictionError()
 305          *
 306          * @param $name String: name of the special page, as seen in links and URLs
 307          * @param $restriction String: user right required, e.g. "block" or "delete"
 308          * @param $listed Bool: whether the page is listed in Special:Specialpages
 309          * @param $function Callback|Bool: function called by execute(). By default it is constructed from $name
 310          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 311          * @param $includable Bool: whether the page can be included in normal pages
 312          */
 313         public function __construct(
 314                 $name = '', $restriction = '', $listed = true,
 315                 $function = false, $file = 'default', $includable = false
 316         ) {
 317                 $this->init( $name, $restriction, $listed, $function, $file, $includable );
 318         }
 319
 320         /**
 321          * Do the real work for the constructor, mainly so __call() can intercept
 322          * calls to SpecialPage()
 323          * @param $name String: name of the special page, as seen in links and URLs
 324          * @param $restriction String: user right required, e.g. "block" or "delete"
 325          * @param $listed Bool: whether the page is listed in Special:Specialpages
 326          * @param $function Callback|Bool: function called by execute(). By default it is constructed from $name
 327          * @param $file String: file which is included by execute(). It is also constructed from $name by default
 328          * @param $includable Bool: whether the page can be included in normal pages
 329          */
 330         private function init( $name, $restriction, $listed, $function, $file, $includable ) {
 331                 $this->mName = $name;
 332                 $this->mRestriction = $restriction;
 333                 $this->mListed = $listed;
 334                 $this->mIncludable = $includable;
 335                 if ( !$function ) {
 336                         $this->mFunction = 'wfSpecial'.$name;
 337                 } else {
 338                         $this->mFunction = $function;
 339                 }
 340                 if ( $file === 'default' ) {
 341                         $this->mFile = dirname(__FILE__) . "/specials/Special$name.php";
 342                 } else {
 343                         $this->mFile = $file;
 344                 }
 345         }
 346
 347         /**
 348          * Use PHP's magic __call handler to get calls to the old PHP4 constructor
 349          * because PHP E_STRICT yells at you for having __construct() and SpecialPage()
 350          *
 351          * @param $fName String Name of called method
 352          * @param $a Array Arguments to the method
 353          * @deprecated since 1.17, call parent::__construct()
 354          */
 355         public function __call( $fName, $a ) {
 356                 // Sometimes $fName is SpecialPage, sometimes it's specialpage. <3 PHP
 357                 if( strtolower( $fName ) == 'specialpage' ) {
 358                         // Deprecated messages now, remove in 1.19 or 1.20?
 359                         wfDeprecated( __METHOD__ );
 360
 361                         $name = isset( $a[0] ) ? $a[0] : '';
 362                         $restriction = isset( $a[1] ) ? $a[1] : '';
 363                         $listed = isset( $a[2] ) ? $a[2] : true;
 364                         $function = isset( $a[3] ) ? $a[3] : false;
 365                         $file = isset( $a[4] ) ? $a[4] : 'default';
 366                         $includable = isset( $a[5] ) ? $a[5] : false;
 367                         $this->init( $name, $restriction, $listed, $function, $file, $includable );
 368                 } else {
 369                         $className = get_class( $this );
 370                         throw new MWException( "Call to undefined method $className::$fName" );
 371                 }
 372         }
 373
 374         /**
 375          * Get the name of this Special Page.
 376          * @return String
 377          */
 378         function getName() {
 379                 return $this->mName;
 380         }
 381
 382         /**
 383          * Get the permission that a user must have to execute this page
 384          * @return String
 385          */
 386         function getRestriction() {
 387                 return $this->mRestriction;
 388         }
 389
 390         /**
 391          * Get the file which will be included by SpecialPage::execute() if your extension is
 392          * still stuck in the past and hasn't overridden the execute() method.  No modern code
 393          * should want or need to know this.
 394          * @return String
 395          * @deprecated since 1.18
 396          */
 397         function getFile() {
 398                 return $this->mFile;
 399         }
 400
 401         // @todo FIXME: Decide which syntax to use for this, and stick to it
 402         /**
 403          * Whether this special page is listed in Special:SpecialPages
 404          * @since r3583 (v1.3)
 405          * @return Bool
 406          */
 407         function isListed() {
 408                 return $this->mListed;
 409         }
 410         /**
 411          * Set whether this page is listed in Special:Specialpages, at run-time
 412          * @since r3583 (v1.3)
 413          * @param $listed Bool
 414          * @return Bool
 415          */
 416         function setListed( $listed ) {
 417                 return wfSetVar( $this->mListed, $listed );
 418         }
 419         /**
 420          * Get or set whether this special page is listed in Special:SpecialPages
 421          * @since r11308 (v1.6)
 422          * @param $x Bool
 423          * @return Bool
 424          */
 425         function listed( $x = null) {
 426                 return wfSetVar( $this->mListed, $x );
 427         }
 428
 429         /**
 430          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 431          * @return Bool
 432          */
 433         public function isIncludable(){
 434                 return $this->mIncludable;
 435         }
 436
 437         /**
 438          * These mutators are very evil, as the relevant variables should not mutate.  So
 439          * don't use them.
 440          * @param $x Mixed
 441          * @return Mixed
 442          * @deprecated since 1.18
 443          */
 444         function name( $x = null ) { return wfSetVar( $this->mName, $x ); }
 445         function restriction( $x = null) { return wfSetVar( $this->mRestriction, $x ); }
 446         function func( $x = null) { return wfSetVar( $this->mFunction, $x ); }
 447         function file( $x = null) { return wfSetVar( $this->mFile, $x ); }
 448         function includable( $x = null ) { return wfSetVar( $this->mIncludable, $x ); }
 449
 450         /**
 451          * Whether the special page is being evaluated via transclusion
 452          * @param $x Bool
 453          * @return Bool
 454          */
 455         function including( $x = null ) {
 456                 return wfSetVar( $this->mIncluding, $x );
 457         }
 458
 459         /**
 460          * Get the localised name of the special page
 461          */
 462         function getLocalName() {
 463                 if ( !isset( $this->mLocalName ) ) {
 464                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 465                 }
 466                 return $this->mLocalName;
 467         }
 468
 469         /**
 470          * Is this page expensive (for some definition of expensive)?
 471          * Expensive pages are disabled or cached in miser mode.  Originally used
 472          * (and still overridden) by QueryPage and subclasses, moved here so that
 473          * Special:SpecialPages can safely call it for all special pages.
 474          *
 475          * @return Boolean
 476          */
 477         public function isExpensive() {
 478                 return false;
 479         }
 480
 481         /**
 482          * Can be overridden by subclasses with more complicated permissions
 483          * schemes.
 484          *
 485          * @return Boolean: should the page be displayed with the restricted-access
 486          *   pages?
 487          */
 488         public function isRestricted() {
 489                 global $wgGroupPermissions;
 490                 // DWIM: If all anons can do something, then it is not restricted
 491                 return $this->mRestriction != '' && empty($wgGroupPermissions['*'][$this->mRestriction]);
 492         }
 493
 494         /**
 495          * Checks if the given user (identified by an object) can execute this
 496          * special page (as defined by $mRestriction).  Can be overridden by sub-
 497          * classes with more complicated permissions schemes.
 498          *
 499          * @param $user User: the user to check
 500          * @return Boolean: does the user have permission to view the page?
 501          */
 502         public function userCanExecute( User $user ) {
 503                 return $user->isAllowed( $this->mRestriction );
 504         }
 505
 506         /**
 507          * Output an error message telling the user what access level they have to have
 508          */
 509         function displayRestrictionError() {
 510                 throw new PermissionsError( $this->mRestriction );
 511         }
 512
 513         /**
 514          * Checks if userCanExecute, and if not throws a PermissionsError
 515          *
 516          * @since 1.19
 517          */
 518         public function checkPermissions() {
 519                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 520                         $this->displayRestrictionError();
 521                 }
 522         }
 523
 524         /**
 525          * Sets headers - this should be called from the execute() method of all derived classes!
 526          */
 527         function setHeaders() {
 528                 $out = $this->getOutput();
 529                 $out->setArticleRelated( false );
 530                 $out->setRobotPolicy( "noindex,nofollow" );
 531                 $out->setPageTitle( $this->getDescription() );
 532         }
 533
 534         /**
 535          * Default execute method
 536          * Checks user permissions, calls the function given in mFunction
 537          *
 538          * This must be overridden by subclasses; it will be made abstract in a future version
 539          *
 540          * @param $par String subpage string, if one was specified
 541          */
 542         function execute( $par ) {
 543                 $this->setHeaders();
 544                 $this->checkPermissions();
 545
 546                 $func = $this->mFunction;
 547                 // only load file if the function does not exist
 548                 if( !is_callable($func) && $this->mFile ) {
 549                         require_once( $this->mFile );
 550                 }
 551                 $this->outputHeader();
 552                 call_user_func( $func, $par, $this );
 553         }
 554
 555         /**
 556          * Outputs a summary message on top of special pages
 557          * Per default the message key is the canonical name of the special page
 558          * May be overriden, i.e. by extensions to stick with the naming conventions
 559          * for message keys: 'extensionname-xxx'
 560          *
 561          * @param $summaryMessageKey String: message key of the summary
 562          */
 563         function outputHeader( $summaryMessageKey = '' ) {
 564                 global $wgContLang;
 565
 566                 if( $summaryMessageKey == '' ) {
 567                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 568                 } else {
 569                         $msg = $summaryMessageKey;
 570                 }
 571                 if ( !$this->msg( $msg )->isBlank() && !$this->including() ) {
 572                         $this->getOutput()->wrapWikiMsg(
 573                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 574                 }
 575
 576         }
 577
 578         /**
 579          * Returns the name that goes in the \<h1\> in the special page itself, and
 580          * also the name that will be listed in Special:Specialpages
 581          *
 582          * Derived classes can override this, but usually it is easier to keep the
 583          * default behaviour. Messages can be added at run-time, see
 584          * MessageCache.php.
 585          *
 586          * @return String
 587          */
 588         function getDescription() {
 589                 return $this->msg( strtolower( $this->mName ) )->text();
 590         }
 591
 592         /**
 593          * Get a self-referential title object
 594          *
 595          * @param $subpage String|Bool
 596          * @return Title object
 597          */
 598         function getTitle( $subpage = false ) {
 599                 return self::getTitleFor( $this->mName, $subpage );
 600         }
 601
 602         /**
 603          * Sets the context this SpecialPage is executed in
 604          *
 605          * @param $context IContextSource
 606          * @since 1.18
 607          */
 608         public function setContext( $context ) {
 609                 $this->mContext = $context;
 610         }
 611
 612         /**
 613          * Gets the context this SpecialPage is executed in
 614          *
 615          * @return IContextSource
 616          * @since 1.18
 617          */
 618         public function getContext() {
 619                 if ( $this->mContext instanceof IContextSource ) {
 620                         return $this->mContext;
 621                 } else {
 622                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
 623                         return RequestContext::getMain();
 624                 }
 625         }
 626
 627         /**
 628          * Get the WebRequest being used for this instance
 629          *
 630          * @return WebRequest
 631          * @since 1.18
 632          */
 633         public function getRequest() {
 634                 return $this->getContext()->getRequest();
 635         }
 636
 637         /**
 638          * Get the OutputPage being used for this instance
 639          *
 640          * @return OutputPage
 641          * @since 1.18
 642          */
 643         public function getOutput() {
 644                 return $this->getContext()->getOutput();
 645         }
 646
 647         /**
 648          * Shortcut to get the User executing this instance
 649          *
 650          * @return User
 651          * @since 1.18
 652          */
 653         public function getUser() {
 654                 return $this->getContext()->getUser();
 655         }
 656
 657         /**
 658          * Shortcut to get the skin being used for this instance
 659          *
 660          * @return Skin
 661          * @since 1.18
 662          */
 663         public function getSkin() {
 664                 return $this->getContext()->getSkin();
 665         }
 666
 667         /**
 668          * Shortcut to get user's language
 669          *
 670          * @return Language
 671          * @since 1.18
 672          */
 673         public function getLang() {
 674                 return $this->getContext()->getLang();
 675         }
 676
 677         /**
 678          * Return the full title, including $par
 679          *
 680          * @return Title
 681          * @since 1.18
 682          */
 683         public function getFullTitle() {
 684                 return $this->getContext()->getTitle();
 685         }
 686
 687         /**
 688          * Wrapper around wfMessage that sets the current context.
 689          *
 690          * @return Message
 691          * @see wfMessage
 692          */
 693         public function msg( /* $args */ ) {
 694                 // Note: can't use func_get_args() directly as second or later item in
 695                 // a parameter list until PHP 5.3 or you get a fatal error.
 696                 // Works fine as the first parameter, which appears elsewhere in the
 697                 // code base. Sighhhh.
 698                 $args = func_get_args();
 699                 return call_user_func_array( array( $this->getContext(), 'msg' ), $args );
 700         }
 701
 702         /**
 703          * Adds RSS/atom links
 704          *
 705          * @param $params array
 706          */
 707         protected function addFeedLinks( $params ) {
 708                 global $wgFeedClasses;
 709
 710                 $feedTemplate = wfScript( 'api' ) . '?';
 711
 712                 foreach( $wgFeedClasses as $format => $class ) {
 713                         $theseParams = $params + array( 'feedformat' => $format );
 714                         $url = $feedTemplate . wfArrayToCGI( $theseParams );
 715                         $this->getOutput()->addFeedLink( $format, $url );
 716                 }
 717         }
 718 }
 719
 720 /**
 721  * Special page which uses an HTMLForm to handle processing.  This is mostly a
 722  * clone of FormAction.  More special pages should be built this way; maybe this could be
 723  * a new structure for SpecialPages
 724  */
 725 abstract class FormSpecialPage extends SpecialPage {
 726
 727         /**
 728          * Get an HTMLForm descriptor array
 729          * @return Array
 730          */
 731         protected abstract function getFormFields();
 732
 733         /**
 734          * Add pre- or post-text to the form
 735          * @return String HTML which will be sent to $form->addPreText()
 736          */
 737         protected function preText() { return ''; }
 738         protected function postText() { return ''; }
 739
 740         /**
 741          * Play with the HTMLForm if you need to more substantially
 742          * @param $form HTMLForm
 743          */
 744         protected function alterForm( HTMLForm $form ) {}
 745
 746         /**
 747          * Get the HTMLForm to control behaviour
 748          * @return HTMLForm|null
 749          */
 750         protected function getForm() {
 751                 $this->fields = $this->getFormFields();
 752
 753                 $form = new HTMLForm( $this->fields, $this->getContext() );
 754                 $form->setSubmitCallback( array( $this, 'onSubmit' ) );
 755                 $form->setWrapperLegend( $this->msg( strtolower( $this->getName() ) . '-legend' ) );
 756                 $form->addHeaderText(
 757                         $this->msg( strtolower( $this->getName() ) . '-text' )->parseAsBlock() );
 758
 759                 // Retain query parameters (uselang etc)
 760                 $params = array_diff_key(
 761                         $this->getRequest()->getQueryValues(), array( 'title' => null ) );
 762                 $form->addHiddenField( 'redirectparams', wfArrayToCGI( $params ) );
 763
 764                 $form->addPreText( $this->preText() );
 765                 $form->addPostText( $this->postText() );
 766                 $this->alterForm( $form );
 767
 768                 // Give hooks a chance to alter the form, adding extra fields or text etc
 769                 wfRunHooks( "Special{$this->getName()}BeforeFormDisplay", array( &$form ) );
 770
 771                 return $form;
 772         }
 773
 774         /**
 775          * Process the form on POST submission.
 776          * @param  $data Array
 777          * @return Bool|Array true for success, false for didn't-try, array of errors on failure
 778          */
 779         public abstract function onSubmit( array $data );
 780
 781         /**
 782          * Do something exciting on successful processing of the form, most likely to show a
 783          * confirmation message
 784          */
 785         public abstract function onSuccess();
 786
 787         /**
 788          * Basic SpecialPage workflow: get a form, send it to the user; get some data back,
 789          *
 790          * @param $par String Subpage string if one was specified
 791          */
 792         public function execute( $par ) {
 793                 $this->setParameter( $par );
 794                 $this->setHeaders();
 795
 796                 // This will throw exceptions if there's a problem
 797                 $this->checkExecutePermissions( $this->getUser() );
 798
 799                 $form = $this->getForm();
 800                 if ( $form->show() ) {
 801                         $this->onSuccess();
 802                 }
 803         }
 804
 805         /**
 806          * Maybe do something interesting with the subpage parameter
 807          * @param $par String
 808          */
 809         protected function setParameter( $par ){}
 810
 811         /**
 812          * Called from execute() to check if the given user can perform this action.
 813          * Failures here must throw subclasses of ErrorPageError.
 814          * @param $user User
 815          * @return Bool true
 816          * @throws ErrorPageError
 817          */
 818         protected function checkExecutePermissions( User $user ) {
 819                 if ( $this->requiresWrite() && wfReadOnly() ) {
 820                         throw new ReadOnlyError();
 821                 }
 822
 823                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 824                         throw new PermissionsError( $this->getRestriction() );
 825                 }
 826
 827                 if ( $this->requiresUnblock() && $user->isBlocked() ) {
 828                         $block = $user->mBlock;
 829                         throw new UserBlockedError( $block );
 830                 }
 831
 832                 return true;
 833         }
 834
 835         /**
 836          * Whether this action requires the wiki not to be locked
 837          * @return Bool
 838          */
 839         public function requiresWrite() {
 840                 return true;
 841         }
 842
 843         /**
 844          * Whether this action cannot be executed by a blocked user
 845          * @return Bool
 846          */
 847         public function requiresUnblock() {
 848                 return true;
 849         }
 850 }
 851
 852 /**
 853  * Shortcut to construct a special page which is unlisted by default
 854  * @ingroup SpecialPage
 855  */
 856 class UnlistedSpecialPage extends SpecialPage {
 857         function __construct( $name, $restriction = '', $function = false, $file = 'default' ) {
 858                 parent::__construct( $name, $restriction, false, $function, $file );
 859         }
 860
 861         public function isListed(){
 862                 return false;
 863         }
 864 }
 865
 866 /**
 867  * Shortcut to construct an includable special  page
 868  * @ingroup SpecialPage
 869  */
 870 class IncludableSpecialPage extends SpecialPage {
 871         function __construct(
 872                 $name, $restriction = '', $listed = true, $function = false, $file = 'default'
 873         ) {
 874                 parent::__construct( $name, $restriction, $listed, $function, $file, true );
 875         }
 876
 877         public function isIncludable(){
 878                 return true;
 879         }
 880 }
 881
 882 /**
 883  * Shortcut to construct a special page alias.
 884  * @ingroup SpecialPage
 885  */
 886 abstract class RedirectSpecialPage extends UnlistedSpecialPage {
 887
 888         // Query parameters that can be passed through redirects
 889         protected $mAllowedRedirectParams = array();
 890
 891         // Query parameteres added by redirects
 892         protected $mAddedRedirectParams = array();
 893
 894         public function execute( $par ){
 895                 $redirect = $this->getRedirect( $par );
 896                 $query = $this->getRedirectQuery();
 897                 // Redirect to a page title with possible query parameters
 898                 if ( $redirect instanceof Title ) {
 899                         $url = $redirect->getFullUrl( $query );
 900                         $this->getOutput()->redirect( $url );
 901                         wfProfileOut( __METHOD__ );
 902                         return $redirect;
 903                 // Redirect to index.php with query parameters
 904                 } elseif ( $redirect === true ) {
 905                         global $wgScript;
 906                         $url = $wgScript . '?' . wfArrayToCGI( $query );
 907                         $this->getOutput()->redirect( $url );
 908                         wfProfileOut( __METHOD__ );
 909                         return $redirect;
 910                 } else {
 911                         $class = __CLASS__;
 912                         throw new MWException( "RedirectSpecialPage $class doesn't redirect!" );
 913                 }
 914         }
 915
 916         /**
 917          * If the special page is a redirect, then get the Title object it redirects to.
 918          * False otherwise.
 919          *
 920          * @param $par String Subpage string
 921          * @return Title|false
 922          */
 923         abstract public function getRedirect( $par );
 924
 925         /**
 926          * Return part of the request string for a special redirect page
 927          * This allows passing, e.g. action=history to Special:Mypage, etc.
 928          *
 929          * @return String
 930          */
 931         public function getRedirectQuery() {
 932                 $params = array();
 933
 934                 foreach( $this->mAllowedRedirectParams as $arg ) {
 935                         if( $this->getRequest()->getVal( $arg, null ) !== null ){
 936                                 $params[$arg] = $this->getRequest()->getVal( $arg );
 937                         }
 938                 }
 939
 940                 foreach( $this->mAddedRedirectParams as $arg => $val ) {
 941                         $params[$arg] = $val;
 942                 }
 943
 944                 return count( $params )
 945                         ? $params
 946                         : false;
 947         }
 948 }
 949
 950 abstract class SpecialRedirectToSpecial extends RedirectSpecialPage {
 951         var $redirName, $redirSubpage;
 952
 953         function __construct(
 954                 $name, $redirName, $redirSubpage = false,
 955                 $allowedRedirectParams = array(), $addedRedirectParams = array()
 956         ) {
 957                 parent::__construct( $name );
 958                 $this->redirName = $redirName;
 959                 $this->redirSubpage = $redirSubpage;
 960                 $this->mAllowedRedirectParams = $allowedRedirectParams;
 961                 $this->mAddedRedirectParams = $addedRedirectParams;
 962         }
 963
 964         public function getRedirect( $subpage ) {
 965                 if ( $this->redirSubpage === false ) {
 966                         return SpecialPage::getTitleFor( $this->redirName, $subpage );
 967                 } else {
 968                         return SpecialPage::getTitleFor( $this->redirName, $this->redirSubpage );
 969                 }
 970         }
 971 }
 972
 973 /**
 974  * ListAdmins --> ListUsers/sysop
 975  */
 976 class SpecialListAdmins extends SpecialRedirectToSpecial {
 977         function __construct(){
 978                 parent::__construct( 'Listadmins', 'Listusers', 'sysop' );
 979         }
 980 }
 981
 982 /**
 983  * ListBots --> ListUsers/bot
 984  */
 985 class SpecialListBots extends SpecialRedirectToSpecial {
 986         function __construct(){
 987                 parent::__construct( 'Listbots', 'Listusers', 'bot' );
 988         }
 989 }
 990
 991 /**
 992  * CreateAccount --> UserLogin/signup
 993  * @todo FIXME: This (and the rest of the login frontend) needs to die a horrible painful death
 994  */
 995 class SpecialCreateAccount extends SpecialRedirectToSpecial {
 996         function __construct(){
 997                 parent::__construct( 'CreateAccount', 'Userlogin', 'signup', array( 'uselang' ) );
 998         }
 999 }
1000 /**
1001  * SpecialMypage, SpecialMytalk and SpecialMycontributions special pages
1002  * are used to get user independant links pointing to the user page, talk
1003  * page and list of contributions.
1004  * This can let us cache a single copy of any generated content for all
1005  * users.
1006  */
1007
1008 /**
1009  * Shortcut to construct a special page pointing to current user user's page.
1010  * @ingroup SpecialPage
1011  */
1012 class SpecialMypage extends RedirectSpecialPage {
1013         function __construct() {
1014                 parent::__construct( 'Mypage' );
1015                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1016                         'section', 'oldid', 'diff', 'dir',
1017                         // Options for action=raw; missing ctype can break JS or CSS in some browsers
1018                         'ctype', 'maxage', 'smaxage' );
1019         }
1020
1021         function getRedirect( $subpage ) {
1022                 if ( strval( $subpage ) !== '' ) {
1023                         return Title::makeTitle( NS_USER, $this->getUser()->getName() . '/' . $subpage );
1024                 } else {
1025                         return Title::makeTitle( NS_USER, $this->getUser()->getName() );
1026                 }
1027         }
1028 }
1029
1030 /**
1031  * Shortcut to construct a special page pointing to current user talk page.
1032  * @ingroup SpecialPage
1033  */
1034 class SpecialMytalk extends RedirectSpecialPage {
1035         function __construct() {
1036                 parent::__construct( 'Mytalk' );
1037                 $this->mAllowedRedirectParams = array( 'action' , 'preload' , 'editintro',
1038                         'section', 'oldid', 'diff', 'dir' );
1039         }
1040
1041         function getRedirect( $subpage ) {
1042                 if ( strval( $subpage ) !== '' ) {
1043                         return Title::makeTitle( NS_USER_TALK, $this->getUser()->getName() . '/' . $subpage );
1044                 } else {
1045                         return Title::makeTitle( NS_USER_TALK, $this->getUser()->getName() );
1046                 }
1047         }
1048 }
1049
1050 /**
1051  * Shortcut to construct a special page pointing to current user contributions.
1052  * @ingroup SpecialPage
1053  */
1054 class SpecialMycontributions extends RedirectSpecialPage {
1055         function __construct() {
1056                 parent::__construct(  'Mycontributions' );
1057                 $this->mAllowedRedirectParams = array( 'limit', 'namespace', 'tagfilter',
1058                         'offset', 'dir', 'year', 'month', 'feed' );
1059         }
1060
1061         function getRedirect( $subpage ) {
1062                 return SpecialPage::getTitleFor( 'Contributions', $this->getUser()->getName() );
1063         }
1064 }
1065
1066 /**
1067  * Redirect to Special:Listfiles?user=$wgUser
1068  */
1069 class SpecialMyuploads extends RedirectSpecialPage {
1070         function __construct() {
1071                 parent::__construct( 'Myuploads' );
1072                 $this->mAllowedRedirectParams = array( 'limit' );
1073         }
1074
1075         function getRedirect( $subpage ) {
1076                 return SpecialPage::getTitleFor( 'Listfiles', $this->getUser()->getName() );
1077         }
1078 }
1079
1080 /**
1081  * Redirect from Special:PermanentLink/### to index.php?oldid=###
1082  */
1083 class SpecialPermanentLink extends RedirectSpecialPage {
1084         function __construct() {
1085                 parent::__construct( 'PermanentLink' );
1086                 $this->mAllowedRedirectParams = array();
1087         }
1088
1089         function getRedirect( $subpage ) {
1090                 $subpage = intval( $subpage );
1091                 if( $subpage === 0 ) {
1092                         # throw an error page when no subpage was given
1093                         throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
1094                 }
1095                 $this->mAddedRedirectParams['oldid'] = $subpage;
1096                 return true;
1097         }
1098 }