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 /**
  25  * Parent class for all special pages.
  26  *
  27  * Includes some static functions for handling the special page list deprecated
  28  * in favor of SpecialPageFactory.
  29  *
  30  * @ingroup SpecialPage
  31  */
  32 class SpecialPage {
  33         // The canonical name of this special page
  34         // Also used for the default <h1> heading, @see getDescription()
  35         protected $mName;
  36
  37         // The local name of this special page
  38         private $mLocalName;
  39
  40         // Minimum user level required to access this page, or "" for anyone.
  41         // Also used to categorise the pages in Special:Specialpages
  42         protected $mRestriction;
  43
  44         // Listed in Special:Specialpages?
  45         private $mListed;
  46
  47         // Whether or not this special page is being included from an article
  48         protected $mIncluding;
  49
  50         // Whether the special page can be included in an article
  51         protected $mIncludable;
  52
  53         /**
  54          * Current request context
  55          * @var IContextSource
  56          */
  57         protected $mContext;
  58
  59         /**
  60          * Get a localised Title object for a specified special page name
  61          *
  62          * @param string $name
  63          * @param string|bool $subpage Subpage string, or false to not use a subpage
  64          * @param string $fragment The link fragment (after the "#")
  65          * @return Title
  66          * @throws MWException
  67          */
  68         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
  69                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  70
  71                 return Title::makeTitle( NS_SPECIAL, $name, $fragment );
  72         }
  73
  74         /**
  75          * Get a localised Title object for a page name with a possibly unvalidated subpage
  76          *
  77          * @param string $name
  78          * @param string|bool $subpage Subpage string, or false to not use a subpage
  79          * @return Title|null Title object or null if the page doesn't exist
  80          */
  81         public static function getSafeTitleFor( $name, $subpage = false ) {
  82                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  83                 if ( $name ) {
  84                         return Title::makeTitleSafe( NS_SPECIAL, $name );
  85                 } else {
  86                         return null;
  87                 }
  88         }
  89
  90         /**
  91          * Default constructor for special pages
  92          * Derivative classes should call this from their constructor
  93          *     Note that if the user does not have the required level, an error message will
  94          *     be displayed by the default execute() method, without the global function ever
  95          *     being called.
  96          *
  97          *     If you override execute(), you can recover the default behavior with userCanExecute()
  98          *     and displayRestrictionError()
  99          *
 100          * @param string $name Name of the special page, as seen in links and URLs
 101          * @param string $restriction User right required, e.g. "block" or "delete"
 102          * @param bool $listed Whether the page is listed in Special:Specialpages
 103          * @param callable|bool $function Unused
 104          * @param string $file Unused
 105          * @param bool $includable Whether the page can be included in normal pages
 106          */
 107         public function __construct(
 108                 $name = '', $restriction = '', $listed = true,
 109                 $function = false, $file = '', $includable = false
 110         ) {
 111                 $this->mName = $name;
 112                 $this->mRestriction = $restriction;
 113                 $this->mListed = $listed;
 114                 $this->mIncludable = $includable;
 115         }
 116
 117         /**
 118          * Get the name of this Special Page.
 119          * @return string
 120          */
 121         function getName() {
 122                 return $this->mName;
 123         }
 124
 125         /**
 126          * Get the permission that a user must have to execute this page
 127          * @return string
 128          */
 129         function getRestriction() {
 130                 return $this->mRestriction;
 131         }
 132
 133         // @todo FIXME: Decide which syntax to use for this, and stick to it
 134         /**
 135          * Whether this special page is listed in Special:SpecialPages
 136          * @since 1.3 (r3583)
 137          * @return bool
 138          */
 139         function isListed() {
 140                 return $this->mListed;
 141         }
 142
 143         /**
 144          * Set whether this page is listed in Special:Specialpages, at run-time
 145          * @since 1.3
 146          * @param bool $listed
 147          * @return bool
 148          */
 149         function setListed( $listed ) {
 150                 return wfSetVar( $this->mListed, $listed );
 151         }
 152
 153         /**
 154          * Get or set whether this special page is listed in Special:SpecialPages
 155          * @since 1.6
 156          * @param bool $x
 157          * @return bool
 158          */
 159         function listed( $x = null ) {
 160                 return wfSetVar( $this->mListed, $x );
 161         }
 162
 163         /**
 164          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 165          * @return bool
 166          */
 167         public function isIncludable() {
 168                 return $this->mIncludable;
 169         }
 170
 171         /**
 172          * Whether the special page is being evaluated via transclusion
 173          * @param bool $x
 174          * @return bool
 175          */
 176         function including( $x = null ) {
 177                 return wfSetVar( $this->mIncluding, $x );
 178         }
 179
 180         /**
 181          * Get the localised name of the special page
 182          * @return string
 183          */
 184         function getLocalName() {
 185                 if ( !isset( $this->mLocalName ) ) {
 186                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 187                 }
 188
 189                 return $this->mLocalName;
 190         }
 191
 192         /**
 193          * Is this page expensive (for some definition of expensive)?
 194          * Expensive pages are disabled or cached in miser mode.  Originally used
 195          * (and still overridden) by QueryPage and subclasses, moved here so that
 196          * Special:SpecialPages can safely call it for all special pages.
 197          *
 198          * @return bool
 199          */
 200         public function isExpensive() {
 201                 return false;
 202         }
 203
 204         /**
 205          * Is this page cached?
 206          * Expensive pages are cached or disabled in miser mode.
 207          * Used by QueryPage and subclasses, moved here so that
 208          * Special:SpecialPages can safely call it for all special pages.
 209          *
 210          * @return bool
 211          * @since 1.21
 212          */
 213         public function isCached() {
 214                 return false;
 215         }
 216
 217         /**
 218          * Can be overridden by subclasses with more complicated permissions
 219          * schemes.
 220          *
 221          * @return bool Should the page be displayed with the restricted-access
 222          *   pages?
 223          */
 224         public function isRestricted() {
 225                 // DWIM: If anons can do something, then it is not restricted
 226                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 227         }
 228
 229         /**
 230          * Checks if the given user (identified by an object) can execute this
 231          * special page (as defined by $mRestriction).  Can be overridden by sub-
 232          * classes with more complicated permissions schemes.
 233          *
 234          * @param User $user The user to check
 235          * @return bool Does the user have permission to view the page?
 236          */
 237         public function userCanExecute( User $user ) {
 238                 return $user->isAllowed( $this->mRestriction );
 239         }
 240
 241         /**
 242          * Output an error message telling the user what access level they have to have
 243          * @throws PermissionsError
 244          */
 245         function displayRestrictionError() {
 246                 throw new PermissionsError( $this->mRestriction );
 247         }
 248
 249         /**
 250          * Checks if userCanExecute, and if not throws a PermissionsError
 251          *
 252          * @since 1.19
 253          * @return void
 254          * @throws PermissionsError
 255          */
 256         public function checkPermissions() {
 257                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 258                         $this->displayRestrictionError();
 259                 }
 260         }
 261
 262         /**
 263          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 264          *
 265          * @since 1.19
 266          * @return void
 267          * @throws ReadOnlyError
 268          */
 269         public function checkReadOnly() {
 270                 if ( wfReadOnly() ) {
 271                         throw new ReadOnlyError;
 272                 }
 273         }
 274
 275         /**
 276          * If the user is not logged in, throws UserNotLoggedIn error
 277          *
 278          * The user will be redirected to Special:Userlogin with the given message as an error on
 279          * the form.
 280          *
 281          * @since 1.23
 282          * @param string $reasonMsg [optional] Message key to be displayed on login page
 283          * @param string $titleMsg [optional] Passed on to UserNotLoggedIn constructor
 284          * @throws UserNotLoggedIn
 285          */
 286         public function requireLogin(
 287                 $reasonMsg = 'exception-nologin-text', $titleMsg = 'exception-nologin'
 288         ) {
 289                 if ( $this->getUser()->isAnon() ) {
 290                         throw new UserNotLoggedIn( $reasonMsg, $titleMsg );
 291                 }
 292         }
 293
 294         /**
 295          * Return an array of subpages beginning with $search that this special page will accept.
 296          *
 297          * For example, if a page supports subpages "foo", "bar" and "baz" (as in Special:PageName/foo,
 298          * etc.):
 299          *
 300          *   - `prefixSearchSubpages( "ba" )` should return `array( "bar", "baz" )`
 301          *   - `prefixSearchSubpages( "f" )` should return `array( "foo" )`
 302          *   - `prefixSearchSubpages( "z" )` should return `array()`
 303          *   - `prefixSearchSubpages( "" )` should return `array( foo", "bar", "baz" )`
 304          *
 305          * @param string $search Prefix to search for
 306          * @param int $limit Maximum number of results to return (usually 10)
 307          * @param int $offset Number of results to skip (usually 0)
 308          * @return string[] Matching subpages
 309          */
 310         public function prefixSearchSubpages( $search, $limit, $offset ) {
 311                 $subpages = $this->getSubpagesForPrefixSearch();
 312                 if ( !$subpages ) {
 313                         return [];
 314                 }
 315
 316                 return self::prefixSearchArray( $search, $limit, $subpages, $offset );
 317         }
 318
 319         /**
 320          * Return an array of subpages that this special page will accept for prefix
 321          * searches. If this method requires a query you might instead want to implement
 322          * prefixSearchSubpages() directly so you can support $limit and $offset. This
 323          * method is better for static-ish lists of things.
 324          *
 325          * @return string[] subpages to search from
 326          */
 327         protected function getSubpagesForPrefixSearch() {
 328                 return [];
 329         }
 330
 331         /**
 332          * Perform a regular substring search for prefixSearchSubpages
 333          * @param string $search Prefix to search for
 334          * @param int $limit Maximum number of results to return (usually 10)
 335          * @param int $offset Number of results to skip (usually 0)
 336          * @return string[] Matching subpages
 337          */
 338         protected function prefixSearchString( $search, $limit, $offset ) {
 339                 $title = Title::newFromText( $search );
 340                 if ( !$title || !$title->canExist() ) {
 341                         // No prefix suggestion in special and media namespace
 342                         return [];
 343                 }
 344
 345                 $searchEngine = SearchEngine::create();
 346                 $searchEngine->setLimitOffset( $limit, $offset );
 347                 $searchEngine->setNamespaces( [] );
 348                 $result = $searchEngine->defaultPrefixSearch( $search );
 349                 return array_map( function( Title $t ) {
 350                         return $t->getPrefixedText();
 351                 }, $result );
 352         }
 353
 354         /**
 355          * Helper function for implementations of prefixSearchSubpages() that
 356          * filter the values in memory (as opposed to making a query).
 357          *
 358          * @since 1.24
 359          * @param string $search
 360          * @param int $limit
 361          * @param array $subpages
 362          * @param int $offset
 363          * @return string[]
 364          */
 365         protected static function prefixSearchArray( $search, $limit, array $subpages, $offset ) {
 366                 $escaped = preg_quote( $search, '/' );
 367                 return array_slice( preg_grep( "/^$escaped/i",
 368                         array_slice( $subpages, $offset ) ), 0, $limit );
 369         }
 370
 371         /**
 372          * Sets headers - this should be called from the execute() method of all derived classes!
 373          */
 374         function setHeaders() {
 375                 $out = $this->getOutput();
 376                 $out->setArticleRelated( false );
 377                 $out->setRobotPolicy( $this->getRobotPolicy() );
 378                 $out->setPageTitle( $this->getDescription() );
 379                 if ( $this->getConfig()->get( 'UseMediaWikiUIEverywhere' ) ) {
 380                         $out->addModuleStyles( [
 381                                 'mediawiki.ui.input',
 382                                 'mediawiki.ui.radio',
 383                                 'mediawiki.ui.checkbox',
 384                         ] );
 385                 }
 386         }
 387
 388         /**
 389          * Entry point.
 390          *
 391          * @since 1.20
 392          *
 393          * @param string|null $subPage
 394          */
 395         final public function run( $subPage ) {
 396                 /**
 397                  * Gets called before @see SpecialPage::execute.
 398                  * Return false to prevent calling execute() (since 1.27+).
 399                  *
 400                  * @since 1.20
 401                  *
 402                  * @param SpecialPage $this
 403                  * @param string|null $subPage
 404                  */
 405                 if ( !Hooks::run( 'SpecialPageBeforeExecute', [ $this, $subPage ] ) ) {
 406                         return;
 407                 }
 408
 409                 if ( $this->beforeExecute( $subPage ) === false ) {
 410                         return;
 411                 }
 412                 $this->execute( $subPage );
 413                 $this->afterExecute( $subPage );
 414
 415                 /**
 416                  * Gets called after @see SpecialPage::execute.
 417                  *
 418                  * @since 1.20
 419                  *
 420                  * @param SpecialPage $this
 421                  * @param string|null $subPage
 422                  */
 423                 Hooks::run( 'SpecialPageAfterExecute', [ $this, $subPage ] );
 424         }
 425
 426         /**
 427          * Gets called before @see SpecialPage::execute.
 428          * Return false to prevent calling execute() (since 1.27+).
 429          *
 430          * @since 1.20
 431          *
 432          * @param string|null $subPage
 433          * @return bool|void
 434          */
 435         protected function beforeExecute( $subPage ) {
 436                 // No-op
 437         }
 438
 439         /**
 440          * Gets called after @see SpecialPage::execute.
 441          *
 442          * @since 1.20
 443          *
 444          * @param string|null $subPage
 445          */
 446         protected function afterExecute( $subPage ) {
 447                 // No-op
 448         }
 449
 450         /**
 451          * Default execute method
 452          * Checks user permissions
 453          *
 454          * This must be overridden by subclasses; it will be made abstract in a future version
 455          *
 456          * @param string|null $subPage
 457          */
 458         public function execute( $subPage ) {
 459                 $this->setHeaders();
 460                 $this->checkPermissions();
 461                 $this->outputHeader();
 462         }
 463
 464         /**
 465          * Outputs a summary message on top of special pages
 466          * Per default the message key is the canonical name of the special page
 467          * May be overridden, i.e. by extensions to stick with the naming conventions
 468          * for message keys: 'extensionname-xxx'
 469          *
 470          * @param string $summaryMessageKey Message key of the summary
 471          */
 472         function outputHeader( $summaryMessageKey = '' ) {
 473                 global $wgContLang;
 474
 475                 if ( $summaryMessageKey == '' ) {
 476                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 477                 } else {
 478                         $msg = $summaryMessageKey;
 479                 }
 480                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 481                         $this->getOutput()->wrapWikiMsg(
 482                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 483                 }
 484         }
 485
 486         /**
 487          * Returns the name that goes in the \<h1\> in the special page itself, and
 488          * also the name that will be listed in Special:Specialpages
 489          *
 490          * Derived classes can override this, but usually it is easier to keep the
 491          * default behavior.
 492          *
 493          * @return string
 494          */
 495         function getDescription() {
 496                 return $this->msg( strtolower( $this->mName ) )->text();
 497         }
 498
 499         /**
 500          * Get a self-referential title object
 501          *
 502          * @param string|bool $subpage
 503          * @return Title
 504          * @deprecated since 1.23, use SpecialPage::getPageTitle
 505          */
 506         function getTitle( $subpage = false ) {
 507                 return $this->getPageTitle( $subpage );
 508         }
 509
 510         /**
 511          * Get a self-referential title object
 512          *
 513          * @param string|bool $subpage
 514          * @return Title
 515          * @since 1.23
 516          */
 517         function getPageTitle( $subpage = false ) {
 518                 return self::getTitleFor( $this->mName, $subpage );
 519         }
 520
 521         /**
 522          * Sets the context this SpecialPage is executed in
 523          *
 524          * @param IContextSource $context
 525          * @since 1.18
 526          */
 527         public function setContext( $context ) {
 528                 $this->mContext = $context;
 529         }
 530
 531         /**
 532          * Gets the context this SpecialPage is executed in
 533          *
 534          * @return IContextSource|RequestContext
 535          * @since 1.18
 536          */
 537         public function getContext() {
 538                 if ( $this->mContext instanceof IContextSource ) {
 539                         return $this->mContext;
 540                 } else {
 541                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
 542                                 "Return RequestContext::getMain(); for sanity\n" );
 543
 544                         return RequestContext::getMain();
 545                 }
 546         }
 547
 548         /**
 549          * Get the WebRequest being used for this instance
 550          *
 551          * @return WebRequest
 552          * @since 1.18
 553          */
 554         public function getRequest() {
 555                 return $this->getContext()->getRequest();
 556         }
 557
 558         /**
 559          * Get the OutputPage being used for this instance
 560          *
 561          * @return OutputPage
 562          * @since 1.18
 563          */
 564         public function getOutput() {
 565                 return $this->getContext()->getOutput();
 566         }
 567
 568         /**
 569          * Shortcut to get the User executing this instance
 570          *
 571          * @return User
 572          * @since 1.18
 573          */
 574         public function getUser() {
 575                 return $this->getContext()->getUser();
 576         }
 577
 578         /**
 579          * Shortcut to get the skin being used for this instance
 580          *
 581          * @return Skin
 582          * @since 1.18
 583          */
 584         public function getSkin() {
 585                 return $this->getContext()->getSkin();
 586         }
 587
 588         /**
 589          * Shortcut to get user's language
 590          *
 591          * @return Language
 592          * @since 1.19
 593          */
 594         public function getLanguage() {
 595                 return $this->getContext()->getLanguage();
 596         }
 597
 598         /**
 599          * Shortcut to get main config object
 600          * @return Config
 601          * @since 1.24
 602          */
 603         public function getConfig() {
 604                 return $this->getContext()->getConfig();
 605         }
 606
 607         /**
 608          * Return the full title, including $par
 609          *
 610          * @return Title
 611          * @since 1.18
 612          */
 613         public function getFullTitle() {
 614                 return $this->getContext()->getTitle();
 615         }
 616
 617         /**
 618          * Return the robot policy. Derived classes that override this can change
 619          * the robot policy set by setHeaders() from the default 'noindex,nofollow'.
 620          *
 621          * @return string
 622          * @since 1.23
 623          */
 624         protected function getRobotPolicy() {
 625                 return 'noindex,nofollow';
 626         }
 627
 628         /**
 629          * Wrapper around wfMessage that sets the current context.
 630          *
 631          * @return Message
 632          * @see wfMessage
 633          */
 634         public function msg( /* $args */ ) {
 635                 $message = call_user_func_array(
 636                         [ $this->getContext(), 'msg' ],
 637                         func_get_args()
 638                 );
 639                 // RequestContext passes context to wfMessage, and the language is set from
 640                 // the context, but setting the language for Message class removes the
 641                 // interface message status, which breaks for example usernameless gender
 642                 // invocations. Restore the flag when not including special page in content.
 643                 if ( $this->including() ) {
 644                         $message->setInterfaceMessageFlag( false );
 645                 }
 646
 647                 return $message;
 648         }
 649
 650         /**
 651          * Adds RSS/atom links
 652          *
 653          * @param array $params
 654          */
 655         protected function addFeedLinks( $params ) {
 656                 $feedTemplate = wfScript( 'api' );
 657
 658                 foreach ( $this->getConfig()->get( 'FeedClasses' ) as $format => $class ) {
 659                         $theseParams = $params + [ 'feedformat' => $format ];
 660                         $url = wfAppendQuery( $feedTemplate, $theseParams );
 661                         $this->getOutput()->addFeedLink( $format, $url );
 662                 }
 663         }
 664
 665         /**
 666          * Adds help link with an icon via page indicators.
 667          * Link target can be overridden by a local message containing a wikilink:
 668          * the message key is: lowercase special page name + '-helppage'.
 669          * @param string $to Target MediaWiki.org page title or encoded URL.
 670          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
 671          * @since 1.25
 672          */
 673         public function addHelpLink( $to, $overrideBaseUrl = false ) {
 674                 global $wgContLang;
 675                 $msg = $this->msg( $wgContLang->lc( $this->getName() ) . '-helppage' );
 676
 677                 if ( !$msg->isDisabled() ) {
 678                         $helpUrl = Skin::makeUrl( $msg->plain() );
 679                         $this->getOutput()->addHelpLink( $helpUrl, true );
 680                 } else {
 681                         $this->getOutput()->addHelpLink( $to, $overrideBaseUrl );
 682                 }
 683         }
 684
 685         /**
 686          * Get the group that the special page belongs in on Special:SpecialPage
 687          * Use this method, instead of getGroupName to allow customization
 688          * of the group name from the wiki side
 689          *
 690          * @return string Group of this special page
 691          * @since 1.21
 692          */
 693         public function getFinalGroupName() {
 694                 $name = $this->getName();
 695
 696                 // Allow overbidding the group from the wiki side
 697                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 698                 if ( !$msg->isBlank() ) {
 699                         $group = $msg->text();
 700                 } else {
 701                         // Than use the group from this object
 702                         $group = $this->getGroupName();
 703                 }
 704
 705                 return $group;
 706         }
 707
 708         /**
 709          * Indicates whether this special page may perform database writes
 710          *
 711          * @return bool
 712          * @since 1.27
 713          */
 714         public function doesWrites() {
 715                 return false;
 716         }
 717
 718         /**
 719          * Under which header this special page is listed in Special:SpecialPages
 720          * See messages 'specialpages-group-*' for valid names
 721          * This method defaults to group 'other'
 722          *
 723          * @return string
 724          * @since 1.21
 725          */
 726         protected function getGroupName() {
 727                 return 'other';
 728         }
 729
 730         /**
 731          * Call wfTransactionalTimeLimit() if this request was POSTed
 732          * @since 1.26
 733          */
 734         protected function useTransactionalTimeLimit() {
 735                 if ( $this->getRequest()->wasPosted() ) {
 736                         wfTransactionalTimeLimit();
 737                 }
 738         }
 739 }