includes/specialpage/SpecialPage.php

   1 <?php
   2 use MediaWiki\MediaWikiServices;
   3
   4 /**
   5  * Parent class for all special pages.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup SpecialPage
  24  */
  25
  26 /**
  27  * Parent class for all special pages.
  28  *
  29  * Includes some static functions for handling the special page list deprecated
  30  * in favor of SpecialPageFactory.
  31  *
  32  * @ingroup SpecialPage
  33  */
  34 class SpecialPage {
  35         // The canonical name of this special page
  36         // Also used for the default <h1> heading, @see getDescription()
  37         protected $mName;
  38
  39         // The local name of this special page
  40         private $mLocalName;
  41
  42         // Minimum user level required to access this page, or "" for anyone.
  43         // Also used to categorise the pages in Special:Specialpages
  44         protected $mRestriction;
  45
  46         // Listed in Special:Specialpages?
  47         private $mListed;
  48
  49         // Whether or not this special page is being included from an article
  50         protected $mIncluding;
  51
  52         // Whether the special page can be included in an article
  53         protected $mIncludable;
  54
  55         /**
  56          * Current request context
  57          * @var IContextSource
  58          */
  59         protected $mContext;
  60
  61         /**
  62          * Get a localised Title object for a specified special page name
  63          *
  64          * @since 1.9
  65          * @since 1.21 $fragment parameter added
  66          *
  67          * @param string $name
  68          * @param string|bool $subpage Subpage string, or false to not use a subpage
  69          * @param string $fragment The link fragment (after the "#")
  70          * @return Title
  71          * @throws MWException
  72          */
  73         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
  74                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  75
  76                 return Title::makeTitle( NS_SPECIAL, $name, $fragment );
  77         }
  78
  79         /**
  80          * Get a localised Title object for a page name with a possibly unvalidated subpage
  81          *
  82          * @param string $name
  83          * @param string|bool $subpage Subpage string, or false to not use a subpage
  84          * @return Title|null Title object or null if the page doesn't exist
  85          */
  86         public static function getSafeTitleFor( $name, $subpage = false ) {
  87                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  88                 if ( $name ) {
  89                         return Title::makeTitleSafe( NS_SPECIAL, $name );
  90                 } else {
  91                         return null;
  92                 }
  93         }
  94
  95         /**
  96          * Default constructor for special pages
  97          * Derivative classes should call this from their constructor
  98          *     Note that if the user does not have the required level, an error message will
  99          *     be displayed by the default execute() method, without the global function ever
 100          *     being called.
 101          *
 102          *     If you override execute(), you can recover the default behavior with userCanExecute()
 103          *     and displayRestrictionError()
 104          *
 105          * @param string $name Name of the special page, as seen in links and URLs
 106          * @param string $restriction User right required, e.g. "block" or "delete"
 107          * @param bool $listed Whether the page is listed in Special:Specialpages
 108          * @param callable|bool $function Unused
 109          * @param string $file Unused
 110          * @param bool $includable Whether the page can be included in normal pages
 111          */
 112         public function __construct(
 113                 $name = '', $restriction = '', $listed = true,
 114                 $function = false, $file = '', $includable = false
 115         ) {
 116                 $this->mName = $name;
 117                 $this->mRestriction = $restriction;
 118                 $this->mListed = $listed;
 119                 $this->mIncludable = $includable;
 120         }
 121
 122         /**
 123          * Get the name of this Special Page.
 124          * @return string
 125          */
 126         function getName() {
 127                 return $this->mName;
 128         }
 129
 130         /**
 131          * Get the permission that a user must have to execute this page
 132          * @return string
 133          */
 134         function getRestriction() {
 135                 return $this->mRestriction;
 136         }
 137
 138         // @todo FIXME: Decide which syntax to use for this, and stick to it
 139         /**
 140          * Whether this special page is listed in Special:SpecialPages
 141          * @since 1.3 (r3583)
 142          * @return bool
 143          */
 144         function isListed() {
 145                 return $this->mListed;
 146         }
 147
 148         /**
 149          * Set whether this page is listed in Special:Specialpages, at run-time
 150          * @since 1.3
 151          * @param bool $listed
 152          * @return bool
 153          */
 154         function setListed( $listed ) {
 155                 return wfSetVar( $this->mListed, $listed );
 156         }
 157
 158         /**
 159          * Get or set whether this special page is listed in Special:SpecialPages
 160          * @since 1.6
 161          * @param bool $x
 162          * @return bool
 163          */
 164         function listed( $x = null ) {
 165                 return wfSetVar( $this->mListed, $x );
 166         }
 167
 168         /**
 169          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 170          * @return bool
 171          */
 172         public function isIncludable() {
 173                 return $this->mIncludable;
 174         }
 175
 176         /**
 177          * Whether the special page is being evaluated via transclusion
 178          * @param bool $x
 179          * @return bool
 180          */
 181         function including( $x = null ) {
 182                 return wfSetVar( $this->mIncluding, $x );
 183         }
 184
 185         /**
 186          * Get the localised name of the special page
 187          * @return string
 188          */
 189         function getLocalName() {
 190                 if ( !isset( $this->mLocalName ) ) {
 191                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 192                 }
 193
 194                 return $this->mLocalName;
 195         }
 196
 197         /**
 198          * Is this page expensive (for some definition of expensive)?
 199          * Expensive pages are disabled or cached in miser mode.  Originally used
 200          * (and still overridden) by QueryPage and subclasses, moved here so that
 201          * Special:SpecialPages can safely call it for all special pages.
 202          *
 203          * @return bool
 204          */
 205         public function isExpensive() {
 206                 return false;
 207         }
 208
 209         /**
 210          * Is this page cached?
 211          * Expensive pages are cached or disabled in miser mode.
 212          * Used by QueryPage and subclasses, moved here so that
 213          * Special:SpecialPages can safely call it for all special pages.
 214          *
 215          * @return bool
 216          * @since 1.21
 217          */
 218         public function isCached() {
 219                 return false;
 220         }
 221
 222         /**
 223          * Can be overridden by subclasses with more complicated permissions
 224          * schemes.
 225          *
 226          * @return bool Should the page be displayed with the restricted-access
 227          *   pages?
 228          */
 229         public function isRestricted() {
 230                 // DWIM: If anons can do something, then it is not restricted
 231                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 232         }
 233
 234         /**
 235          * Checks if the given user (identified by an object) can execute this
 236          * special page (as defined by $mRestriction).  Can be overridden by sub-
 237          * classes with more complicated permissions schemes.
 238          *
 239          * @param User $user The user to check
 240          * @return bool Does the user have permission to view the page?
 241          */
 242         public function userCanExecute( User $user ) {
 243                 return $user->isAllowed( $this->mRestriction );
 244         }
 245
 246         /**
 247          * Output an error message telling the user what access level they have to have
 248          * @throws PermissionsError
 249          */
 250         function displayRestrictionError() {
 251                 throw new PermissionsError( $this->mRestriction );
 252         }
 253
 254         /**
 255          * Checks if userCanExecute, and if not throws a PermissionsError
 256          *
 257          * @since 1.19
 258          * @return void
 259          * @throws PermissionsError
 260          */
 261         public function checkPermissions() {
 262                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 263                         $this->displayRestrictionError();
 264                 }
 265         }
 266
 267         /**
 268          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 269          *
 270          * @since 1.19
 271          * @return void
 272          * @throws ReadOnlyError
 273          */
 274         public function checkReadOnly() {
 275                 if ( wfReadOnly() ) {
 276                         throw new ReadOnlyError;
 277                 }
 278         }
 279
 280         /**
 281          * If the user is not logged in, throws UserNotLoggedIn error
 282          *
 283          * The user will be redirected to Special:Userlogin with the given message as an error on
 284          * the form.
 285          *
 286          * @since 1.23
 287          * @param string $reasonMsg [optional] Message key to be displayed on login page
 288          * @param string $titleMsg [optional] Passed on to UserNotLoggedIn constructor
 289          * @throws UserNotLoggedIn
 290          */
 291         public function requireLogin(
 292                 $reasonMsg = 'exception-nologin-text', $titleMsg = 'exception-nologin'
 293         ) {
 294                 if ( $this->getUser()->isAnon() ) {
 295                         throw new UserNotLoggedIn( $reasonMsg, $titleMsg );
 296                 }
 297         }
 298
 299         /**
 300          * Return an array of subpages beginning with $search that this special page will accept.
 301          *
 302          * For example, if a page supports subpages "foo", "bar" and "baz" (as in Special:PageName/foo,
 303          * etc.):
 304          *
 305          *   - `prefixSearchSubpages( "ba" )` should return `array( "bar", "baz" )`
 306          *   - `prefixSearchSubpages( "f" )` should return `array( "foo" )`
 307          *   - `prefixSearchSubpages( "z" )` should return `array()`
 308          *   - `prefixSearchSubpages( "" )` should return `array( foo", "bar", "baz" )`
 309          *
 310          * @param string $search Prefix to search for
 311          * @param int $limit Maximum number of results to return (usually 10)
 312          * @param int $offset Number of results to skip (usually 0)
 313          * @return string[] Matching subpages
 314          */
 315         public function prefixSearchSubpages( $search, $limit, $offset ) {
 316                 $subpages = $this->getSubpagesForPrefixSearch();
 317                 if ( !$subpages ) {
 318                         return [];
 319                 }
 320
 321                 return self::prefixSearchArray( $search, $limit, $subpages, $offset );
 322         }
 323
 324         /**
 325          * Return an array of subpages that this special page will accept for prefix
 326          * searches. If this method requires a query you might instead want to implement
 327          * prefixSearchSubpages() directly so you can support $limit and $offset. This
 328          * method is better for static-ish lists of things.
 329          *
 330          * @return string[] subpages to search from
 331          */
 332         protected function getSubpagesForPrefixSearch() {
 333                 return [];
 334         }
 335
 336         /**
 337          * Perform a regular substring search for prefixSearchSubpages
 338          * @param string $search Prefix to search for
 339          * @param int $limit Maximum number of results to return (usually 10)
 340          * @param int $offset Number of results to skip (usually 0)
 341          * @return string[] Matching subpages
 342          */
 343         protected function prefixSearchString( $search, $limit, $offset ) {
 344                 $title = Title::newFromText( $search );
 345                 if ( !$title || !$title->canExist() ) {
 346                         // No prefix suggestion in special and media namespace
 347                         return [];
 348                 }
 349
 350                 $searchEngine = MediaWikiServices::getInstance()->newSearchEngine();
 351                 $searchEngine->setLimitOffset( $limit, $offset );
 352                 $searchEngine->setNamespaces( [] );
 353                 $result = $searchEngine->defaultPrefixSearch( $search );
 354                 return array_map( function( Title $t ) {
 355                         return $t->getPrefixedText();
 356                 }, $result );
 357         }
 358
 359         /**
 360          * Helper function for implementations of prefixSearchSubpages() that
 361          * filter the values in memory (as opposed to making a query).
 362          *
 363          * @since 1.24
 364          * @param string $search
 365          * @param int $limit
 366          * @param array $subpages
 367          * @param int $offset
 368          * @return string[]
 369          */
 370         protected static function prefixSearchArray( $search, $limit, array $subpages, $offset ) {
 371                 $escaped = preg_quote( $search, '/' );
 372                 return array_slice( preg_grep( "/^$escaped/i",
 373                         array_slice( $subpages, $offset ) ), 0, $limit );
 374         }
 375
 376         /**
 377          * Sets headers - this should be called from the execute() method of all derived classes!
 378          */
 379         function setHeaders() {
 380                 $out = $this->getOutput();
 381                 $out->setArticleRelated( false );
 382                 $out->setRobotPolicy( $this->getRobotPolicy() );
 383                 $out->setPageTitle( $this->getDescription() );
 384                 if ( $this->getConfig()->get( 'UseMediaWikiUIEverywhere' ) ) {
 385                         $out->addModuleStyles( [
 386                                 'mediawiki.ui.input',
 387                                 'mediawiki.ui.radio',
 388                                 'mediawiki.ui.checkbox',
 389                         ] );
 390                 }
 391         }
 392
 393         /**
 394          * Entry point.
 395          *
 396          * @since 1.20
 397          *
 398          * @param string|null $subPage
 399          */
 400         final public function run( $subPage ) {
 401                 /**
 402                  * Gets called before @see SpecialPage::execute.
 403                  * Return false to prevent calling execute() (since 1.27+).
 404                  *
 405                  * @since 1.20
 406                  *
 407                  * @param SpecialPage $this
 408                  * @param string|null $subPage
 409                  */
 410                 if ( !Hooks::run( 'SpecialPageBeforeExecute', [ $this, $subPage ] ) ) {
 411                         return;
 412                 }
 413
 414                 if ( $this->beforeExecute( $subPage ) === false ) {
 415                         return;
 416                 }
 417                 $this->execute( $subPage );
 418                 $this->afterExecute( $subPage );
 419
 420                 /**
 421                  * Gets called after @see SpecialPage::execute.
 422                  *
 423                  * @since 1.20
 424                  *
 425                  * @param SpecialPage $this
 426                  * @param string|null $subPage
 427                  */
 428                 Hooks::run( 'SpecialPageAfterExecute', [ $this, $subPage ] );
 429         }
 430
 431         /**
 432          * Gets called before @see SpecialPage::execute.
 433          * Return false to prevent calling execute() (since 1.27+).
 434          *
 435          * @since 1.20
 436          *
 437          * @param string|null $subPage
 438          * @return bool|void
 439          */
 440         protected function beforeExecute( $subPage ) {
 441                 // No-op
 442         }
 443
 444         /**
 445          * Gets called after @see SpecialPage::execute.
 446          *
 447          * @since 1.20
 448          *
 449          * @param string|null $subPage
 450          */
 451         protected function afterExecute( $subPage ) {
 452                 // No-op
 453         }
 454
 455         /**
 456          * Default execute method
 457          * Checks user permissions
 458          *
 459          * This must be overridden by subclasses; it will be made abstract in a future version
 460          *
 461          * @param string|null $subPage
 462          */
 463         public function execute( $subPage ) {
 464                 $this->setHeaders();
 465                 $this->checkPermissions();
 466                 $this->outputHeader();
 467         }
 468
 469         /**
 470          * Outputs a summary message on top of special pages
 471          * Per default the message key is the canonical name of the special page
 472          * May be overridden, i.e. by extensions to stick with the naming conventions
 473          * for message keys: 'extensionname-xxx'
 474          *
 475          * @param string $summaryMessageKey Message key of the summary
 476          */
 477         function outputHeader( $summaryMessageKey = '' ) {
 478                 global $wgContLang;
 479
 480                 if ( $summaryMessageKey == '' ) {
 481                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 482                 } else {
 483                         $msg = $summaryMessageKey;
 484                 }
 485                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 486                         $this->getOutput()->wrapWikiMsg(
 487                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 488                 }
 489         }
 490
 491         /**
 492          * Returns the name that goes in the \<h1\> in the special page itself, and
 493          * also the name that will be listed in Special:Specialpages
 494          *
 495          * Derived classes can override this, but usually it is easier to keep the
 496          * default behavior.
 497          *
 498          * @return string
 499          */
 500         function getDescription() {
 501                 return $this->msg( strtolower( $this->mName ) )->text();
 502         }
 503
 504         /**
 505          * Get a self-referential title object
 506          *
 507          * @param string|bool $subpage
 508          * @return Title
 509          * @deprecated since 1.23, use SpecialPage::getPageTitle
 510          */
 511         function getTitle( $subpage = false ) {
 512                 return $this->getPageTitle( $subpage );
 513         }
 514
 515         /**
 516          * Get a self-referential title object
 517          *
 518          * @param string|bool $subpage
 519          * @return Title
 520          * @since 1.23
 521          */
 522         function getPageTitle( $subpage = false ) {
 523                 return self::getTitleFor( $this->mName, $subpage );
 524         }
 525
 526         /**
 527          * Sets the context this SpecialPage is executed in
 528          *
 529          * @param IContextSource $context
 530          * @since 1.18
 531          */
 532         public function setContext( $context ) {
 533                 $this->mContext = $context;
 534         }
 535
 536         /**
 537          * Gets the context this SpecialPage is executed in
 538          *
 539          * @return IContextSource|RequestContext
 540          * @since 1.18
 541          */
 542         public function getContext() {
 543                 if ( $this->mContext instanceof IContextSource ) {
 544                         return $this->mContext;
 545                 } else {
 546                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
 547                                 "Return RequestContext::getMain(); for sanity\n" );
 548
 549                         return RequestContext::getMain();
 550                 }
 551         }
 552
 553         /**
 554          * Get the WebRequest being used for this instance
 555          *
 556          * @return WebRequest
 557          * @since 1.18
 558          */
 559         public function getRequest() {
 560                 return $this->getContext()->getRequest();
 561         }
 562
 563         /**
 564          * Get the OutputPage being used for this instance
 565          *
 566          * @return OutputPage
 567          * @since 1.18
 568          */
 569         public function getOutput() {
 570                 return $this->getContext()->getOutput();
 571         }
 572
 573         /**
 574          * Shortcut to get the User executing this instance
 575          *
 576          * @return User
 577          * @since 1.18
 578          */
 579         public function getUser() {
 580                 return $this->getContext()->getUser();
 581         }
 582
 583         /**
 584          * Shortcut to get the skin being used for this instance
 585          *
 586          * @return Skin
 587          * @since 1.18
 588          */
 589         public function getSkin() {
 590                 return $this->getContext()->getSkin();
 591         }
 592
 593         /**
 594          * Shortcut to get user's language
 595          *
 596          * @return Language
 597          * @since 1.19
 598          */
 599         public function getLanguage() {
 600                 return $this->getContext()->getLanguage();
 601         }
 602
 603         /**
 604          * Shortcut to get main config object
 605          * @return Config
 606          * @since 1.24
 607          */
 608         public function getConfig() {
 609                 return $this->getContext()->getConfig();
 610         }
 611
 612         /**
 613          * Return the full title, including $par
 614          *
 615          * @return Title
 616          * @since 1.18
 617          */
 618         public function getFullTitle() {
 619                 return $this->getContext()->getTitle();
 620         }
 621
 622         /**
 623          * Return the robot policy. Derived classes that override this can change
 624          * the robot policy set by setHeaders() from the default 'noindex,nofollow'.
 625          *
 626          * @return string
 627          * @since 1.23
 628          */
 629         protected function getRobotPolicy() {
 630                 return 'noindex,nofollow';
 631         }
 632
 633         /**
 634          * Wrapper around wfMessage that sets the current context.
 635          *
 636          * @return Message
 637          * @see wfMessage
 638          */
 639         public function msg( /* $args */ ) {
 640                 $message = call_user_func_array(
 641                         [ $this->getContext(), 'msg' ],
 642                         func_get_args()
 643                 );
 644                 // RequestContext passes context to wfMessage, and the language is set from
 645                 // the context, but setting the language for Message class removes the
 646                 // interface message status, which breaks for example usernameless gender
 647                 // invocations. Restore the flag when not including special page in content.
 648                 if ( $this->including() ) {
 649                         $message->setInterfaceMessageFlag( false );
 650                 }
 651
 652                 return $message;
 653         }
 654
 655         /**
 656          * Adds RSS/atom links
 657          *
 658          * @param array $params
 659          */
 660         protected function addFeedLinks( $params ) {
 661                 $feedTemplate = wfScript( 'api' );
 662
 663                 foreach ( $this->getConfig()->get( 'FeedClasses' ) as $format => $class ) {
 664                         $theseParams = $params + [ 'feedformat' => $format ];
 665                         $url = wfAppendQuery( $feedTemplate, $theseParams );
 666                         $this->getOutput()->addFeedLink( $format, $url );
 667                 }
 668         }
 669
 670         /**
 671          * Adds help link with an icon via page indicators.
 672          * Link target can be overridden by a local message containing a wikilink:
 673          * the message key is: lowercase special page name + '-helppage'.
 674          * @param string $to Target MediaWiki.org page title or encoded URL.
 675          * @param bool $overrideBaseUrl Whether $url is a full URL, to avoid MW.o.
 676          * @since 1.25
 677          */
 678         public function addHelpLink( $to, $overrideBaseUrl = false ) {
 679                 global $wgContLang;
 680                 $msg = $this->msg( $wgContLang->lc( $this->getName() ) . '-helppage' );
 681
 682                 if ( !$msg->isDisabled() ) {
 683                         $helpUrl = Skin::makeUrl( $msg->plain() );
 684                         $this->getOutput()->addHelpLink( $helpUrl, true );
 685                 } else {
 686                         $this->getOutput()->addHelpLink( $to, $overrideBaseUrl );
 687                 }
 688         }
 689
 690         /**
 691          * Get the group that the special page belongs in on Special:SpecialPage
 692          * Use this method, instead of getGroupName to allow customization
 693          * of the group name from the wiki side
 694          *
 695          * @return string Group of this special page
 696          * @since 1.21
 697          */
 698         public function getFinalGroupName() {
 699                 $name = $this->getName();
 700
 701                 // Allow overbidding the group from the wiki side
 702                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 703                 if ( !$msg->isBlank() ) {
 704                         $group = $msg->text();
 705                 } else {
 706                         // Than use the group from this object
 707                         $group = $this->getGroupName();
 708                 }
 709
 710                 return $group;
 711         }
 712
 713         /**
 714          * Indicates whether this special page may perform database writes
 715          *
 716          * @return bool
 717          * @since 1.27
 718          */
 719         public function doesWrites() {
 720                 return false;
 721         }
 722
 723         /**
 724          * Under which header this special page is listed in Special:SpecialPages
 725          * See messages 'specialpages-group-*' for valid names
 726          * This method defaults to group 'other'
 727          *
 728          * @return string
 729          * @since 1.21
 730          */
 731         protected function getGroupName() {
 732                 return 'other';
 733         }
 734
 735         /**
 736          * Call wfTransactionalTimeLimit() if this request was POSTed
 737          * @since 1.26
 738          */
 739         protected function useTransactionalTimeLimit() {
 740                 if ( $this->getRequest()->wasPosted() ) {
 741                         wfTransactionalTimeLimit();
 742                 }
 743         }
 744 }