includes/specialpage/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 use MediaWiki\Auth\AuthManager;
  25 use MediaWiki\Linker\LinkRenderer;
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * Parent class for all special pages.
  30  *
  31  * Includes some static functions for handling the special page list deprecated
  32  * in favor of SpecialPageFactory.
  33  *
  34  * @ingroup SpecialPage
  35  */
  36 class SpecialPage {
  37         // The canonical name of this special page
  38         // Also used for the default <h1> heading, @see getDescription()
  39         protected $mName;
  40
  41         // The local name of this special page
  42         private $mLocalName;
  43
  44         // Minimum user level required to access this page, or "" for anyone.
  45         // Also used to categorise the pages in Special:Specialpages
  46         protected $mRestriction;
  47
  48         // Listed in Special:Specialpages?
  49         private $mListed;
  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          * @var LinkRenderer|null
  65          */
  66         private $linkRenderer;
  67
  68         /**
  69          * Get a localised Title object for a specified special page name
  70          *
  71          * @since 1.9
  72          * @since 1.21 $fragment parameter added
  73          *
  74          * @param string $name
  75          * @param string|bool $subpage Subpage string, or false to not use a subpage
  76          * @param string $fragment The link fragment (after the "#")
  77          * @return Title
  78          * @throws MWException
  79          */
  80         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
  81                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  82
  83                 return Title::makeTitle( NS_SPECIAL, $name, $fragment );
  84         }
  85
  86         /**
  87          * Get a localised Title object for a page name with a possibly unvalidated subpage
  88          *
  89          * @param string $name
  90          * @param string|bool $subpage Subpage string, or false to not use a subpage
  91          * @return Title|null Title object or null if the page doesn't exist
  92          */
  93         public static function getSafeTitleFor( $name, $subpage = false ) {
  94                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  95                 if ( $name ) {
  96                         return Title::makeTitleSafe( NS_SPECIAL, $name );
  97                 } else {
  98                         return null;
  99                 }
 100         }
 101
 102         /**
 103          * Default constructor for special pages
 104          * Derivative classes should call this from their constructor
 105          *     Note that if the user does not have the required level, an error message will
 106          *     be displayed by the default execute() method, without the global function ever
 107          *     being called.
 108          *
 109          *     If you override execute(), you can recover the default behavior with userCanExecute()
 110          *     and displayRestrictionError()
 111          *
 112          * @param string $name Name of the special page, as seen in links and URLs
 113          * @param string $restriction User right required, e.g. "block" or "delete"
 114          * @param bool $listed Whether the page is listed in Special:Specialpages
 115          * @param callable|bool $function Unused
 116          * @param string $file Unused
 117          * @param bool $includable Whether the page can be included in normal pages
 118          */
 119         public function __construct(
 120                 $name = '', $restriction = '', $listed = true,
 121                 $function = false, $file = '', $includable = false
 122         ) {
 123                 $this->mName = $name;
 124                 $this->mRestriction = $restriction;
 125                 $this->mListed = $listed;
 126                 $this->mIncludable = $includable;
 127         }
 128
 129         /**
 130          * Get the name of this Special Page.
 131          * @return string
 132          */
 133         function getName() {
 134                 return $this->mName;
 135         }
 136
 137         /**
 138          * Get the permission that a user must have to execute this page
 139          * @return string
 140          */
 141         function getRestriction() {
 142                 return $this->mRestriction;
 143         }
 144
 145         // @todo FIXME: Decide which syntax to use for this, and stick to it
 146         /**
 147          * Whether this special page is listed in Special:SpecialPages
 148          * @since 1.3 (r3583)
 149          * @return bool
 150          */
 151         function isListed() {
 152                 return $this->mListed;
 153         }
 154
 155         /**
 156          * Set whether this page is listed in Special:Specialpages, at run-time
 157          * @since 1.3
 158          * @param bool $listed
 159          * @return bool
 160          */
 161         function setListed( $listed ) {
 162                 return wfSetVar( $this->mListed, $listed );
 163         }
 164
 165         /**
 166          * Get or set whether this special page is listed in Special:SpecialPages
 167          * @since 1.6
 168          * @param bool $x
 169          * @return bool
 170          */
 171         function listed( $x = null ) {
 172                 return wfSetVar( $this->mListed, $x );
 173         }
 174
 175         /**
 176          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 177          * @return bool
 178          */
 179         public function isIncludable() {
 180                 return $this->mIncludable;
 181         }
 182
 183         /**
 184          * How long to cache page when it is being included.
 185          *
 186          * @note If cache time is not 0, then the current user becomes an anon
 187          *   if you want to do any per-user customizations, than this method
 188          *   must be overriden to return 0.
 189          * @since 1.26
 190          * @return int Time in seconds, 0 to disable caching altogether,
 191          *  false to use the parent page's cache settings
 192          */
 193         public function maxIncludeCacheTime() {
 194                 return $this->getConfig()->get( 'MiserMode' ) ? $this->getCacheTTL() : 0;
 195         }
 196
 197         /**
 198          * @return int Seconds that this page can be cached
 199          */
 200         protected function getCacheTTL() {
 201                 return 60 * 60;
 202         }
 203
 204         /**
 205          * Whether the special page is being evaluated via transclusion
 206          * @param bool $x
 207          * @return bool
 208          */
 209         function including( $x = null ) {
 210                 return wfSetVar( $this->mIncluding, $x );
 211         }
 212
 213         /**
 214          * Get the localised name of the special page
 215          * @return string
 216          */
 217         function getLocalName() {
 218                 if ( !isset( $this->mLocalName ) ) {
 219                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 220                 }
 221
 222                 return $this->mLocalName;
 223         }
 224
 225         /**
 226          * Is this page expensive (for some definition of expensive)?
 227          * Expensive pages are disabled or cached in miser mode.  Originally used
 228          * (and still overridden) by QueryPage and subclasses, moved here so that
 229          * Special:SpecialPages can safely call it for all special pages.
 230          *
 231          * @return bool
 232          */
 233         public function isExpensive() {
 234                 return false;
 235         }
 236
 237         /**
 238          * Is this page cached?
 239          * Expensive pages are cached or disabled in miser mode.
 240          * Used by QueryPage and subclasses, moved here so that
 241          * Special:SpecialPages can safely call it for all special pages.
 242          *
 243          * @return bool
 244          * @since 1.21
 245          */
 246         public function isCached() {
 247                 return false;
 248         }
 249
 250         /**
 251          * Can be overridden by subclasses with more complicated permissions
 252          * schemes.
 253          *
 254          * @return bool Should the page be displayed with the restricted-access
 255          *   pages?
 256          */
 257         public function isRestricted() {
 258                 // DWIM: If anons can do something, then it is not restricted
 259                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 260         }
 261
 262         /**
 263          * Checks if the given user (identified by an object) can execute this
 264          * special page (as defined by $mRestriction).  Can be overridden by sub-
 265          * classes with more complicated permissions schemes.
 266          *
 267          * @param User $user The user to check
 268          * @return bool Does the user have permission to view the page?
 269          */
 270         public function userCanExecute( User $user ) {
 271                 return $user->isAllowed( $this->mRestriction );
 272         }
 273
 274         /**
 275          * Output an error message telling the user what access level they have to have
 276          * @throws PermissionsError
 277          */
 278         function displayRestrictionError() {
 279                 throw new PermissionsError( $this->mRestriction );
 280         }
 281
 282         /**
 283          * Checks if userCanExecute, and if not throws a PermissionsError
 284          *
 285          * @since 1.19
 286          * @return void
 287          * @throws PermissionsError
 288          */
 289         public function checkPermissions() {
 290                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 291                         $this->displayRestrictionError();
 292                 }
 293         }
 294
 295         /**
 296          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 297          *
 298          * @since 1.19
 299          * @return void
 300          * @throws ReadOnlyError
 301          */
 302         public function checkReadOnly() {
 303                 if ( wfReadOnly() ) {
 304                         throw new ReadOnlyError;
 305                 }
 306         }
 307
 308         /**
 309          * If the user is not logged in, throws UserNotLoggedIn error
 310          *
 311          * The user will be redirected to Special:Userlogin with the given message as an error on
 312          * the form.
 313          *
 314          * @since 1.23
 315          * @param string $reasonMsg [optional] Message key to be displayed on login page
 316          * @param string $titleMsg [optional] Passed on to UserNotLoggedIn constructor
 317          * @throws UserNotLoggedIn
 318          */
 319         public function requireLogin(
 320                 $reasonMsg = 'exception-nologin-text', $titleMsg = 'exception-nologin'
 321         ) {
 322                 if ( $this->getUser()->isAnon() ) {
 323                         throw new UserNotLoggedIn( $reasonMsg, $titleMsg );
 324                 }
 325         }
 326
 327         /**
 328          * Tells if the special page does something security-sensitive and needs extra defense against
 329          * a stolen account (e.g. a reauthentication). What exactly that will mean is decided by the
 330          * authentication framework.
 331          * @return bool|string False or the argument for AuthManager::securitySensitiveOperationStatus().
 332          *   Typically a special page needing elevated security would return its name here.
 333          */
 334         protected function getLoginSecurityLevel() {
 335                 return false;
 336         }
 337
 338         /**
 339          * Verifies that the user meets the security level, possibly reauthenticating them in the process.
 340          *
 341          * This should be used when the page does something security-sensitive and needs extra defense
 342          * against a stolen account (e.g. a reauthentication). The authentication framework will make
 343          * an extra effort to make sure the user account is not compromised. What that exactly means
 344          * will depend on the system and user settings; e.g. the user might be required to log in again
 345          * unless their last login happened recently, or they might be given a second-factor challenge.
 346          *
 347          * Calling this method will result in one if these actions:
 348          * - return true: all good.
 349          * - return false and set a redirect: caller should abort; the redirect will take the user
 350          *   to the login page for reauthentication, and back.
 351          * - throw an exception if there is no way for the user to meet the requirements without using
 352          *   a different access method (e.g. this functionality is only available from a specific IP).
 353          *
 354          * Note that this does not in any way check that the user is authorized to use this special page
 355          * (use checkPermissions() for that).
 356          *
 357          * @param string $level A security level. Can be an arbitrary string, defaults to the page name.
 358          * @return bool False means a redirect to the reauthentication page has been set and processing
 359          *   of the special page should be aborted.
 360          * @throws ErrorPageError If the security level cannot be met, even with reauthentication.
 361          */
 362         protected function checkLoginSecurityLevel( $level = null ) {
 363                 $level = $level ?: $this->getName();
 364                 $securityStatus = AuthManager::singleton()->securitySensitiveOperationStatus( $level );
 365                 if ( $securityStatus === AuthManager::SEC_OK ) {
 366                         return true;
 367                 } elseif ( $securityStatus === AuthManager::SEC_REAUTH ) {
 368                         $request = $this->getRequest();
 369                         $title = SpecialPage::getTitleFor( 'Userlogin' );
 370                         $query = [
 371                                 'returnto' => $this->getFullTitle()->getPrefixedDBkey(),
 372                                 'returntoquery' => wfArrayToCgi( array_diff_key( $request->getQueryValues(),
 373                                         [ 'title' => true ] ) ),
 374                                 'force' => $level,
 375                         ];
 376                         $url = $title->getFullURL( $query, false, PROTO_HTTPS );
 377
 378                         $this->getOutput()->redirect( $url );
 379                         return false;
 380                 }
 381
 382                 $titleMessage = wfMessage( 'specialpage-securitylevel-not-allowed-title' );
 383                 $errorMessage = wfMessage( 'specialpage-securitylevel-not-allowed' );
 384                 throw new ErrorPageError( $titleMessage, $errorMessage );
 385         }
 386
 387         /**
 388          * Return an array of subpages beginning with $search that this special page will accept.
 389          *
 390          * For example, if a page supports subpages "foo", "bar" and "baz" (as in Special:PageName/foo,
 391          * etc.):
 392          *
 393          *   - `prefixSearchSubpages( "ba" )` should return `array( "bar", "baz" )`
 394          *   - `prefixSearchSubpages( "f" )` should return `array( "foo" )`
 395          *   - `prefixSearchSubpages( "z" )` should return `array()`
 396          *   - `prefixSearchSubpages( "" )` should return `array( foo", "bar", "baz" )`
 397          *
 398          * @param string $search Prefix to search for
 399          * @param int $limit Maximum number of results to return (usually 10)
 400          * @param int $offset Number of results to skip (usually 0)
 401          * @return string[] Matching subpages
 402          */
 403         public function prefixSearchSubpages( $search, $limit, $offset ) {
 404                 $subpages = $this->getSubpagesForPrefixSearch();
 405                 if ( !$subpages ) {
 406                         return [];
 407                 }
 408
 409                 return self::prefixSearchArray( $search, $limit, $subpages, $offset );
 410         }
 411
 412         /**
 413          * Return an array of subpages that this special page will accept for prefix
 414          * searches. If this method requires a query you might instead want to implement
 415          * prefixSearchSubpages() directly so you can support $limit and $offset. This
 416          * method is better for static-ish lists of things.
 417          *
 418          * @return string[] subpages to search from
 419          */
 420         protected function getSubpagesForPrefixSearch() {
 421                 return [];
 422         }
 423
 424         /**
 425          * Perform a regular substring search for prefixSearchSubpages
 426          * @param string $search Prefix to search for
 427          * @param int $limit Maximum number of results to return (usually 10)
 428          * @param int $offset Number of results to skip (usually 0)
 429          * @return string[] Matching subpages
 430          */
 431         protected function prefixSearchString( $search, $limit, $offset ) {
 432                 $title = Title::newFromText( $search );
 433                 if ( !$title || !$title->canExist() ) {
 434                         // No prefix suggestion in special and media namespace
 435                         return [];
 436                 }
 437
 438                 $searchEngine = MediaWikiServices::getInstance()->newSearchEngine();
 439                 $searchEngine->setLimitOffset( $limit, $offset );
 440                 $searchEngine->setNamespaces( [] );
 441                 $result = $searchEngine->defaultPrefixSearch( $search );
 442                 return array_map( function( Title $t ) {
 443                         return $t->getPrefixedText();
 444                 }, $result );
 445         }
 446
 447         /**
 448          * Helper function for implementations of prefixSearchSubpages() that
 449          * filter the values in memory (as opposed to making a query).
 450          *
 451          * @since 1.24
 452          * @param string $search
 453          * @param int $limit
 454          * @param array $subpages
 455          * @param int $offset
 456          * @return string[]
 457          */
 458         protected static function prefixSearchArray( $search, $limit, array $subpages, $offset ) {
 459                 $escaped = preg_quote( $search, '/' );
 460                 return array_slice( preg_grep( "/^$escaped/i",
 461                         array_slice( $subpages, $offset ) ), 0, $limit );
 462         }
 463
 464         /**
 465          * Sets headers - this should be called from the execute() method of all derived classes!
 466          */
 467         function setHeaders() {
 468                 $out = $this->getOutput();
 469                 $out->setArticleRelated( false );
 470                 $out->setRobotPolicy( $this->getRobotPolicy() );
 471                 $out->setPageTitle( $this->getDescription() );
 472                 if ( $this->getConfig()->get( 'UseMediaWikiUIEverywhere' ) ) {
 473                         $out->addModuleStyles( [
 474                                 'mediawiki.ui.input',
 475                                 'mediawiki.ui.radio',
 476                                 'mediawiki.ui.checkbox',
 477                         ] );
 478                 }
 479         }
 480
 481         /**
 482          * Entry point.
 483          *
 484          * @since 1.20
 485          *
 486          * @param string|null $subPage
 487          */
 488         final public function run( $subPage ) {
 489                 /**
 490                  * Gets called before @see SpecialPage::execute.
 491                  * Return false to prevent calling execute() (since 1.27+).
 492                  *
 493                  * @since 1.20
 494                  *
 495                  * @param SpecialPage $this
 496                  * @param string|null $subPage
 497                  */
 498                 if ( !Hooks::run( 'SpecialPageBeforeExecute', [ $this, $subPage ] ) ) {
 499                         return;
 500                 }
 501
 502                 if ( $this->beforeExecute( $subPage ) === false ) {
 503                         return;
 504                 }
 505                 $this->execute( $subPage );
 506                 $this->afterExecute( $subPage );
 507
 508                 /**
 509                  * Gets called after @see SpecialPage::execute.
 510                  *
 511                  * @since 1.20
 512                  *
 513                  * @param SpecialPage $this
 514                  * @param string|null $subPage
 515                  */
 516                 Hooks::run( 'SpecialPageAfterExecute', [ $this, $subPage ] );
 517         }
 518
 519         /**
 520          * Gets called before @see SpecialPage::execute.
 521          * Return false to prevent calling execute() (since 1.27+).
 522          *
 523          * @since 1.20
 524          *
 525          * @param string|null $subPage
 526          * @return bool|void
 527          */
 528         protected function beforeExecute( $subPage ) {
 529                 // No-op
 530         }
 531
 532         /**
 533          * Gets called after @see SpecialPage::execute.
 534          *
 535          * @since 1.20
 536          *
 537          * @param string|null $subPage
 538          */
 539         protected function afterExecute( $subPage ) {
 540                 // No-op
 541         }
 542
 543         /**
 544          * Default execute method
 545          * Checks user permissions
 546          *
 547          * This must be overridden by subclasses; it will be made abstract in a future version
 548          *
 549          * @param string|null $subPage
 550          */
 551         public function execute( $subPage ) {
 552                 $this->setHeaders();
 553                 $this->checkPermissions();
 554                 $this->checkLoginSecurityLevel( $this->getLoginSecurityLevel() );
 555                 $this->outputHeader();
 556         }
 557
 558         /**
 559          * Outputs a summary message on top of special pages
 560          * Per default the message key is the canonical name of the special page
 561          * May be overridden, i.e. by extensions to stick with the naming conventions
 562          * for message keys: 'extensionname-xxx'
 563          *
 564          * @param string $summaryMessageKey Message key of the summary
 565          */
 566         function outputHeader( $summaryMessageKey = '' ) {
 567                 global $wgContLang;
 568
 569                 if ( $summaryMessageKey == '' ) {
 570                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 571                 } else {
 572                         $msg = $summaryMessageKey;
 573                 }
 574                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 575                         $this->getOutput()->wrapWikiMsg(
 576                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 577                 }
 578         }
 579
 580         /**
 581          * Returns the name that goes in the \<h1\> in the special page itself, and
 582          * also the name that will be listed in Special:Specialpages
 583          *
 584          * Derived classes can override this, but usually it is easier to keep the
 585          * default behavior.
 586          *
 587          * @return string
 588          */
 589         function getDescription() {
 590                 return $this->msg( strtolower( $this->mName ) )->text();
 591         }
 592
 593         /**
 594          * Get a self-referential title object
 595          *
 596          * @param string|bool $subpage
 597          * @return Title
 598          * @deprecated since 1.23, use SpecialPage::getPageTitle
 599          */
 600         function getTitle( $subpage = false ) {
 601                 return $this->getPageTitle( $subpage );
 602         }
 603
 604         /**
 605          * Get a self-referential title object
 606          *
 607          * @param string|bool $subpage
 608          * @return Title
 609          * @since 1.23
 610          */
 611         function getPageTitle( $subpage = false ) {
 612                 return self::getTitleFor( $this->mName, $subpage );
 613         }
 614
 615         /**
 616          * Sets the context this SpecialPage is executed in
 617          *
 618          * @param IContextSource $context
 619          * @since 1.18
 620          */
 621         public function setContext( $context ) {
 622                 $this->mContext = $context;
 623         }
 624
 625         /**
 626          * Gets the context this SpecialPage is executed in
 627          *
 628          * @return IContextSource|RequestContext
 629          * @since 1.18
 630          */
 631         public function getContext() {
 632                 if ( $this->mContext instanceof IContextSource ) {
 633                         return $this->mContext;
 634                 } else {
 635                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
 636                                 "Return RequestContext::getMain(); for sanity\n" );
 637
 638                         return RequestContext::getMain();
 639                 }
 640         }
 641
 642         /**
 643          * Get the WebRequest being used for this instance
 644          *
 645          * @return WebRequest
 646          * @since 1.18
 647          */
 648         public function getRequest() {
 649                 return $this->getContext()->getRequest();
 650         }
 651
 652         /**
 653          * Get the OutputPage being used for this instance
 654          *
 655          * @return OutputPage
 656          * @since 1.18
 657          */
 658         public function getOutput() {
 659                 return $this->getContext()->getOutput();
 660         }
 661
 662         /**
 663          * Shortcut to get the User executing this instance
 664          *
 665          * @return User
 666          * @since 1.18
 667          */
 668         public function getUser() {
 669                 return $this->getContext()->getUser();
 670         }
 671
 672         /**
 673          * Shortcut to get the skin being used for this instance
 674          *
 675          * @return Skin
 676          * @since 1.18
 677          */
 678         public function getSkin() {
 679                 return $this->getContext()->getSkin();
 680         }
 681
 682         /**
 683          * Shortcut to get user's language
 684          *
 685          * @return Language
 686          * @since 1.19
 687          */
 688         public function getLanguage() {
 689                 return $this->getContext()->getLanguage();
 690         }
 691
 692         /**
 693          * Shortcut to get main config object
 694          * @return Config
 695          * @since 1.24
 696          */
 697         public function getConfig() {
 698                 return $this->getContext()->getConfig();
 699         }
 700
 701         /**
 702          * Return the full title, including $par
 703          *
 704          * @return Title
 705          * @since 1.18
 706          */
 707         public function getFullTitle() {
 708                 return $this->getContext()->getTitle();
 709         }
 710
 711         /**
 712          * Return the robot policy. Derived classes that override this can change
 713          * the robot policy set by setHeaders() from the default 'noindex,nofollow'.
 714          *
 715          * @return string
 716          * @since 1.23
 717          */
 718         protected function getRobotPolicy() {
 719                 return 'noindex,nofollow';
 720         }
 721
 722         /**
 723          * Wrapper around wfMessage that sets the current context.
 724          *
 725          * @since 1.16
 726          * @return Message
 727          * @see wfMessage
 728          */
 729         public function msg( /* $args */ ) {
 730                 $message = call_user_func_array(
 731                         [ $this->getContext(), 'msg' ],
 732                         func_get_args()
 733                 );
 734                 // RequestContext passes context to wfMessage, and the language is set from
 735                 // the context, but setting the language for Message class removes the
 736                 // interface message status, which breaks for example usernameless gender
 737                 // invocations. Restore the flag when not including special page in content.
 738                 if ( $this->including() ) {
 739                         $message->setInterfaceMessageFlag( false );
 740                 }
 741
 742                 return $message;
 743         }
 744
 745         /**
 746          * Adds RSS/atom links
 747          *
 748          * @param array $params
 749          */
 750         protected function addFeedLinks( $params ) {
 751                 $feedTemplate = wfScript( 'api' );
 752
 753                 foreach ( $this->getConfig()->get( 'FeedClasses' ) as $format => $class ) {
 754                         $theseParams = $params + [ 'feedformat' => $format ];
 755                         $url = wfAppendQuery( $feedTemplate, $theseParams );
 756                         $this->getOutput()->addFeedLink( $format, $url );
 757                 }
 758         }
 759
 760         /**
 761          * Adds help link with an icon via page indicators.
 762          * Link target can be overridden by a local message containing a wikilink:
 763          * the message key is: lowercase special page name + '-helppage'.
 764          * @param string $to Target MediaWiki.org page title or encoded URL.
 765          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
 766          * @since 1.25
 767          */
 768         public function addHelpLink( $to, $overrideBaseUrl = false ) {
 769                 global $wgContLang;
 770                 $msg = $this->msg( $wgContLang->lc( $this->getName() ) . '-helppage' );
 771
 772                 if ( !$msg->isDisabled() ) {
 773                         $helpUrl = Skin::makeUrl( $msg->plain() );
 774                         $this->getOutput()->addHelpLink( $helpUrl, true );
 775                 } else {
 776                         $this->getOutput()->addHelpLink( $to, $overrideBaseUrl );
 777                 }
 778         }
 779
 780         /**
 781          * Get the group that the special page belongs in on Special:SpecialPage
 782          * Use this method, instead of getGroupName to allow customization
 783          * of the group name from the wiki side
 784          *
 785          * @return string Group of this special page
 786          * @since 1.21
 787          */
 788         public function getFinalGroupName() {
 789                 $name = $this->getName();
 790
 791                 // Allow overbidding the group from the wiki side
 792                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 793                 if ( !$msg->isBlank() ) {
 794                         $group = $msg->text();
 795                 } else {
 796                         // Than use the group from this object
 797                         $group = $this->getGroupName();
 798                 }
 799
 800                 return $group;
 801         }
 802
 803         /**
 804          * Indicates whether this special page may perform database writes
 805          *
 806          * @return bool
 807          * @since 1.27
 808          */
 809         public function doesWrites() {
 810                 return false;
 811         }
 812
 813         /**
 814          * Under which header this special page is listed in Special:SpecialPages
 815          * See messages 'specialpages-group-*' for valid names
 816          * This method defaults to group 'other'
 817          *
 818          * @return string
 819          * @since 1.21
 820          */
 821         protected function getGroupName() {
 822                 return 'other';
 823         }
 824
 825         /**
 826          * Call wfTransactionalTimeLimit() if this request was POSTed
 827          * @since 1.26
 828          */
 829         protected function useTransactionalTimeLimit() {
 830                 if ( $this->getRequest()->wasPosted() ) {
 831                         wfTransactionalTimeLimit();
 832                 }
 833         }
 834
 835         /**
 836          * @since 1.28
 837          * @return LinkRenderer
 838          */
 839         protected function getLinkRenderer() {
 840                 if ( $this->linkRenderer ) {
 841                         return $this->linkRenderer;
 842                 } else {
 843                         return MediaWikiServices::getInstance()->getLinkRenderer();
 844                 }
 845         }
 846
 847         /**
 848          * @since 1.28
 849          * @param LinkRenderer $linkRenderer
 850          */
 851         public function setLinkRenderer( LinkRenderer $linkRenderer ) {
 852                 $this->linkRenderer = $linkRenderer;
 853         }
 854 }