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  * @todo Turn this into a real ContextSource
  31  * @ingroup SpecialPage
  32  */
  33 class SpecialPage {
  34         // The canonical name of this special page
  35         // Also used for the default <h1> heading, @see getDescription()
  36         protected $mName;
  37
  38         // The local name of this special page
  39         private $mLocalName;
  40
  41         // Minimum user level required to access this page, or "" for anyone.
  42         // Also used to categorise the pages in Special:Specialpages
  43         private $mRestriction;
  44
  45         // Listed in Special:Specialpages?
  46         private $mListed;
  47
  48         // Whether or not this special page is being included from an article
  49         protected $mIncluding;
  50
  51         // Whether the special page can be included in an article
  52         protected $mIncludable;
  53
  54         /**
  55          * Current request context
  56          * @var IContextSource
  57          */
  58         protected $mContext;
  59
  60         /**
  61          * Get a localised Title object for a specified special page name
  62          *
  63          * @param string $name
  64          * @param string|bool $subpage Subpage string, or false to not use a subpage
  65          * @param string $fragment The link fragment (after the "#")
  66          * @return Title
  67          * @throws MWException
  68          */
  69         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
  70                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  71
  72                 return Title::makeTitle( NS_SPECIAL, $name, $fragment );
  73         }
  74
  75         /**
  76          * Get a localised Title object for a page name with a possibly unvalidated subpage
  77          *
  78          * @param string $name
  79          * @param string|bool $subpage Subpage string, or false to not use a subpage
  80          * @return Title|null Title object or null if the page doesn't exist
  81          */
  82         public static function getSafeTitleFor( $name, $subpage = false ) {
  83                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  84                 if ( $name ) {
  85                         return Title::makeTitleSafe( NS_SPECIAL, $name );
  86                 } else {
  87                         return null;
  88                 }
  89         }
  90
  91         /**
  92          * Default constructor for special pages
  93          * Derivative classes should call this from their constructor
  94          *     Note that if the user does not have the required level, an error message will
  95          *     be displayed by the default execute() method, without the global function ever
  96          *     being called.
  97          *
  98          *     If you override execute(), you can recover the default behavior with userCanExecute()
  99          *     and displayRestrictionError()
 100          *
 101          * @param string $name Name of the special page, as seen in links and URLs
 102          * @param string $restriction User right required, e.g. "block" or "delete"
 103          * @param bool $listed Whether the page is listed in Special:Specialpages
 104          * @param callable|bool $function unused
 105          * @param string $file unused
 106          * @param bool $includable Whether the page can be included in normal pages
 107          */
 108         public function __construct(
 109                 $name = '', $restriction = '', $listed = true,
 110                 $function = false, $file = '', $includable = false
 111         ) {
 112                 $this->mName = $name;
 113                 $this->mRestriction = $restriction;
 114                 $this->mListed = $listed;
 115                 $this->mIncludable = $includable;
 116         }
 117
 118         /**
 119          * Get the name of this Special Page.
 120          * @return string
 121          */
 122         function getName() {
 123                 return $this->mName;
 124         }
 125
 126         /**
 127          * Get the permission that a user must have to execute this page
 128          * @return string
 129          */
 130         function getRestriction() {
 131                 return $this->mRestriction;
 132         }
 133
 134         // @todo FIXME: Decide which syntax to use for this, and stick to it
 135         /**
 136          * Whether this special page is listed in Special:SpecialPages
 137          * @since r3583 (v1.3)
 138          * @return bool
 139          */
 140         function isListed() {
 141                 return $this->mListed;
 142         }
 143
 144         /**
 145          * Set whether this page is listed in Special:Specialpages, at run-time
 146          * @since 1.3
 147          * @param bool $listed
 148          * @return bool
 149          */
 150         function setListed( $listed ) {
 151                 return wfSetVar( $this->mListed, $listed );
 152         }
 153
 154         /**
 155          * Get or set whether this special page is listed in Special:SpecialPages
 156          * @since 1.6
 157          * @param bool $x
 158          * @return bool
 159          */
 160         function listed( $x = null ) {
 161                 return wfSetVar( $this->mListed, $x );
 162         }
 163
 164         /**
 165          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 166          * @return bool
 167          */
 168         public function isIncludable() {
 169                 return $this->mIncludable;
 170         }
 171
 172         /**
 173          * Whether the special page is being evaluated via transclusion
 174          * @param bool $x
 175          * @return bool
 176          */
 177         function including( $x = null ) {
 178                 return wfSetVar( $this->mIncluding, $x );
 179         }
 180
 181         /**
 182          * Get the localised name of the special page
 183          * @return string
 184          */
 185         function getLocalName() {
 186                 if ( !isset( $this->mLocalName ) ) {
 187                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 188                 }
 189
 190                 return $this->mLocalName;
 191         }
 192
 193         /**
 194          * Is this page expensive (for some definition of expensive)?
 195          * Expensive pages are disabled or cached in miser mode.  Originally used
 196          * (and still overridden) by QueryPage and subclasses, moved here so that
 197          * Special:SpecialPages can safely call it for all special pages.
 198          *
 199          * @return bool
 200          */
 201         public function isExpensive() {
 202                 return false;
 203         }
 204
 205         /**
 206          * Is this page cached?
 207          * Expensive pages are cached or disabled in miser mode.
 208          * Used by QueryPage and subclasses, moved here so that
 209          * Special:SpecialPages can safely call it for all special pages.
 210          *
 211          * @return bool
 212          * @since 1.21
 213          */
 214         public function isCached() {
 215                 return false;
 216         }
 217
 218         /**
 219          * Can be overridden by subclasses with more complicated permissions
 220          * schemes.
 221          *
 222          * @return bool Should the page be displayed with the restricted-access
 223          *   pages?
 224          */
 225         public function isRestricted() {
 226                 // DWIM: If anons can do something, then it is not restricted
 227                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 228         }
 229
 230         /**
 231          * Checks if the given user (identified by an object) can execute this
 232          * special page (as defined by $mRestriction).  Can be overridden by sub-
 233          * classes with more complicated permissions schemes.
 234          *
 235          * @param User $user The user to check
 236          * @return bool Does the user have permission to view the page?
 237          */
 238         public function userCanExecute( User $user ) {
 239                 return $user->isAllowed( $this->mRestriction );
 240         }
 241
 242         /**
 243          * Output an error message telling the user what access level they have to have
 244          * @throws PermissionsError
 245          */
 246         function displayRestrictionError() {
 247                 throw new PermissionsError( $this->mRestriction );
 248         }
 249
 250         /**
 251          * Checks if userCanExecute, and if not throws a PermissionsError
 252          *
 253          * @since 1.19
 254          * @return void
 255          * @throws PermissionsError
 256          */
 257         public function checkPermissions() {
 258                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 259                         $this->displayRestrictionError();
 260                 }
 261         }
 262
 263         /**
 264          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 265          *
 266          * @since 1.19
 267          * @return void
 268          * @throws ReadOnlyError
 269          */
 270         public function checkReadOnly() {
 271                 if ( wfReadOnly() ) {
 272                         throw new ReadOnlyError;
 273                 }
 274         }
 275
 276         /**
 277          * If the user is not logged in, throws UserNotLoggedIn error.
 278          *
 279          * Default error message includes a link to Special:Userlogin with properly set 'returnto' query
 280          * parameter.
 281          *
 282          * @since 1.23
 283          * @param string|Message $reasonMsg [optional] Passed on to UserNotLoggedIn constructor. Strings
 284          *     will be used as message keys. If a string is given, the message will also receive a
 285          *     formatted login link (generated using the 'loginreqlink' message) as first parameter. If a
 286          *     Message is given, it will be passed on verbatim.
 287          * @param string|Message $titleMsg [optional] Passed on to UserNotLoggedIn constructor. Strings
 288          *     will be used as message keys.
 289          * @throws UserNotLoggedIn
 290          */
 291         public function requireLogin( $reasonMsg = null, $titleMsg = null ) {
 292                 if ( $this->getUser()->isAnon() ) {
 293                         // Use default messages if not given or explicit null passed
 294                         if ( !$reasonMsg ) {
 295                                 $reasonMsg = 'exception-nologin-text-manual';
 296                         }
 297                         if ( !$titleMsg ) {
 298                                 $titleMsg = 'exception-nologin';
 299                         }
 300
 301                         // Convert to Messages with current context
 302                         if ( is_string( $reasonMsg ) ) {
 303                                 $loginreqlink = Linker::linkKnown(
 304                                         SpecialPage::getTitleFor( 'Userlogin' ),
 305                                         $this->msg( 'loginreqlink' )->escaped(),
 306                                         array(),
 307                                         array( 'returnto' => $this->getPageTitle()->getPrefixedText() )
 308                                 );
 309                                 $reasonMsg = $this->msg( $reasonMsg )->rawParams( $loginreqlink );
 310                         }
 311                         if ( is_string( $titleMsg ) ) {
 312                                 $titleMsg = $this->msg( $titleMsg );
 313                         }
 314
 315                         throw new UserNotLoggedIn( $reasonMsg, $titleMsg );
 316                 }
 317         }
 318
 319         /**
 320          * Return an array of subpages beginning with $search that this special page will accept.
 321          *
 322          * For example, if a page supports subpages "foo", "bar" and "baz" (as in Special:PageName/foo,
 323          * etc.):
 324          *
 325          *   - `prefixSearchSubpages( "ba" )` should return `array( "bar", "baz" )`
 326          *   - `prefixSearchSubpages( "f" )` should return `array( "foo" )`
 327          *   - `prefixSearchSubpages( "z" )` should return `array()`
 328          *   - `prefixSearchSubpages( "" )` should return `array( foo", "bar", "baz" )`
 329          *
 330          * @param string $search Prefix to search for
 331          * @param integer $limit Maximum number of results to return
 332          * @return string[] Matching subpages
 333          */
 334         public function prefixSearchSubpages( $search, $limit = 10 ) {
 335                 return array();
 336         }
 337
 338         /**
 339          * Helper function for implementations of prefixSearchSubpages() that
 340          * filter the values in memory (as oppposed to making a query).
 341          *
 342          * @since 1.24
 343          * @param string $search
 344          * @param int $limit
 345          * @param array $subpages
 346          * @return string[]
 347          */
 348         protected static function prefixSearchArray( $search, $limit, array $subpages ) {
 349                 $escaped = preg_quote( $search, '/' );
 350                 return array_slice( preg_grep( "/^$escaped/i", $subpages ), 0, $limit );
 351         }
 352
 353         /**
 354          * Sets headers - this should be called from the execute() method of all derived classes!
 355          */
 356         function setHeaders() {
 357                 $out = $this->getOutput();
 358                 $out->setArticleRelated( false );
 359                 $out->setRobotPolicy( $this->getRobotPolicy() );
 360                 $out->setPageTitle( $this->getDescription() );
 361         }
 362
 363         /**
 364          * Entry point.
 365          *
 366          * @since 1.20
 367          *
 368          * @param string|null $subPage
 369          */
 370         final public function run( $subPage ) {
 371                 /**
 372                  * Gets called before @see SpecialPage::execute.
 373                  *
 374                  * @since 1.20
 375                  *
 376                  * @param SpecialPage $this
 377                  * @param string|null $subPage
 378                  */
 379                 wfRunHooks( 'SpecialPageBeforeExecute', array( $this, $subPage ) );
 380
 381                 $this->beforeExecute( $subPage );
 382                 $this->execute( $subPage );
 383                 $this->afterExecute( $subPage );
 384
 385                 /**
 386                  * Gets called after @see SpecialPage::execute.
 387                  *
 388                  * @since 1.20
 389                  *
 390                  * @param SpecialPage $this
 391                  * @param string|null $subPage
 392                  */
 393                 wfRunHooks( 'SpecialPageAfterExecute', array( $this, $subPage ) );
 394         }
 395
 396         /**
 397          * Gets called before @see SpecialPage::execute.
 398          *
 399          * @since 1.20
 400          *
 401          * @param string|null $subPage
 402          */
 403         protected function beforeExecute( $subPage ) {
 404                 // No-op
 405         }
 406
 407         /**
 408          * Gets called after @see SpecialPage::execute.
 409          *
 410          * @since 1.20
 411          *
 412          * @param string|null $subPage
 413          */
 414         protected function afterExecute( $subPage ) {
 415                 // No-op
 416         }
 417
 418         /**
 419          * Default execute method
 420          * Checks user permissions
 421          *
 422          * This must be overridden by subclasses; it will be made abstract in a future version
 423          *
 424          * @param string|null $subPage
 425          */
 426         public function execute( $subPage ) {
 427                 $this->setHeaders();
 428                 $this->checkPermissions();
 429                 $this->outputHeader();
 430         }
 431
 432         /**
 433          * Outputs a summary message on top of special pages
 434          * Per default the message key is the canonical name of the special page
 435          * May be overridden, i.e. by extensions to stick with the naming conventions
 436          * for message keys: 'extensionname-xxx'
 437          *
 438          * @param string $summaryMessageKey Message key of the summary
 439          */
 440         function outputHeader( $summaryMessageKey = '' ) {
 441                 global $wgContLang;
 442
 443                 if ( $summaryMessageKey == '' ) {
 444                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 445                 } else {
 446                         $msg = $summaryMessageKey;
 447                 }
 448                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 449                         $this->getOutput()->wrapWikiMsg(
 450                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 451                 }
 452         }
 453
 454         /**
 455          * Returns the name that goes in the \<h1\> in the special page itself, and
 456          * also the name that will be listed in Special:Specialpages
 457          *
 458          * Derived classes can override this, but usually it is easier to keep the
 459          * default behavior.
 460          *
 461          * @return string
 462          */
 463         function getDescription() {
 464                 return $this->msg( strtolower( $this->mName ) )->text();
 465         }
 466
 467         /**
 468          * Get a self-referential title object
 469          *
 470          * @param string|bool $subpage
 471          * @return Title
 472          * @deprecated since 1.23, use SpecialPage::getPageTitle
 473          */
 474         function getTitle( $subpage = false ) {
 475                 return $this->getPageTitle( $subpage );
 476         }
 477
 478         /**
 479          * Get a self-referential title object
 480          *
 481          * @param string|bool $subpage
 482          * @return Title
 483          * @since 1.23
 484          */
 485         function getPageTitle( $subpage = false ) {
 486                 return self::getTitleFor( $this->mName, $subpage );
 487         }
 488
 489         /**
 490          * Sets the context this SpecialPage is executed in
 491          *
 492          * @param IContextSource $context
 493          * @since 1.18
 494          */
 495         public function setContext( $context ) {
 496                 $this->mContext = $context;
 497         }
 498
 499         /**
 500          * Gets the context this SpecialPage is executed in
 501          *
 502          * @return IContextSource|RequestContext
 503          * @since 1.18
 504          */
 505         public function getContext() {
 506                 if ( $this->mContext instanceof IContextSource ) {
 507                         return $this->mContext;
 508                 } else {
 509                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
 510                                 "Return RequestContext::getMain(); for sanity\n" );
 511
 512                         return RequestContext::getMain();
 513                 }
 514         }
 515
 516         /**
 517          * Get the WebRequest being used for this instance
 518          *
 519          * @return WebRequest
 520          * @since 1.18
 521          */
 522         public function getRequest() {
 523                 return $this->getContext()->getRequest();
 524         }
 525
 526         /**
 527          * Get the OutputPage being used for this instance
 528          *
 529          * @return OutputPage
 530          * @since 1.18
 531          */
 532         public function getOutput() {
 533                 return $this->getContext()->getOutput();
 534         }
 535
 536         /**
 537          * Shortcut to get the User executing this instance
 538          *
 539          * @return User
 540          * @since 1.18
 541          */
 542         public function getUser() {
 543                 return $this->getContext()->getUser();
 544         }
 545
 546         /**
 547          * Shortcut to get the skin being used for this instance
 548          *
 549          * @return Skin
 550          * @since 1.18
 551          */
 552         public function getSkin() {
 553                 return $this->getContext()->getSkin();
 554         }
 555
 556         /**
 557          * Shortcut to get user's language
 558          *
 559          * @return Language
 560          * @since 1.19
 561          */
 562         public function getLanguage() {
 563                 return $this->getContext()->getLanguage();
 564         }
 565
 566         /**
 567          * Shortcut to get main config object
 568          * @return Config
 569          * @since 1.24
 570          */
 571         public function getConfig() {
 572                 return $this->getContext()->getConfig();
 573         }
 574
 575         /**
 576          * Return the full title, including $par
 577          *
 578          * @return Title
 579          * @since 1.18
 580          */
 581         public function getFullTitle() {
 582                 return $this->getContext()->getTitle();
 583         }
 584
 585         /**
 586          * Return the robot policy. Derived classes that override this can change
 587          * the robot policy set by setHeaders() from the default 'noindex,nofollow'.
 588          *
 589          * @return string
 590          * @since 1.23
 591          */
 592         protected function getRobotPolicy() {
 593                 return 'noindex,nofollow';
 594         }
 595
 596         /**
 597          * Wrapper around wfMessage that sets the current context.
 598          *
 599          * @return Message
 600          * @see wfMessage
 601          */
 602         public function msg( /* $args */ ) {
 603                 $message = call_user_func_array(
 604                         array( $this->getContext(), 'msg' ),
 605                         func_get_args()
 606                 );
 607                 // RequestContext passes context to wfMessage, and the language is set from
 608                 // the context, but setting the language for Message class removes the
 609                 // interface message status, which breaks for example usernameless gender
 610                 // invocations. Restore the flag when not including special page in content.
 611                 if ( $this->including() ) {
 612                         $message->setInterfaceMessageFlag( false );
 613                 }
 614
 615                 return $message;
 616         }
 617
 618         /**
 619          * Adds RSS/atom links
 620          *
 621          * @param array $params
 622          */
 623         protected function addFeedLinks( $params ) {
 624                 global $wgFeedClasses;
 625
 626                 $feedTemplate = wfScript( 'api' );
 627
 628                 foreach ( $wgFeedClasses as $format => $class ) {
 629                         $theseParams = $params + array( 'feedformat' => $format );
 630                         $url = wfAppendQuery( $feedTemplate, $theseParams );
 631                         $this->getOutput()->addFeedLink( $format, $url );
 632                 }
 633         }
 634
 635         /**
 636          * Get the group that the special page belongs in on Special:SpecialPage
 637          * Use this method, instead of getGroupName to allow customization
 638          * of the group name from the wiki side
 639          *
 640          * @return string Group of this special page
 641          * @since 1.21
 642          */
 643         public function getFinalGroupName() {
 644                 global $wgSpecialPageGroups;
 645                 $name = $this->getName();
 646
 647                 // Allow overbidding the group from the wiki side
 648                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 649                 if ( !$msg->isBlank() ) {
 650                         $group = $msg->text();
 651                 } else {
 652                         // Than use the group from this object
 653                         $group = $this->getGroupName();
 654
 655                         // Group '-' is used as default to have the chance to determine,
 656                         // if the special pages overrides this method,
 657                         // if not overridden, $wgSpecialPageGroups is checked for b/c
 658                         if ( $group === '-' && isset( $wgSpecialPageGroups[$name] ) ) {
 659                                 $group = $wgSpecialPageGroups[$name];
 660                         }
 661                 }
 662
 663                 // never give '-' back, change to 'other'
 664                 if ( $group === '-' ) {
 665                         $group = 'other';
 666                 }
 667
 668                 return $group;
 669         }
 670
 671         /**
 672          * Under which header this special page is listed in Special:SpecialPages
 673          * See messages 'specialpages-group-*' for valid names
 674          * This method defaults to group 'other'
 675          *
 676          * @return string
 677          * @since 1.21
 678          */
 679         protected function getGroupName() {
 680                 // '-' used here to determine, if this group is overridden or has a hardcoded 'other'
 681                 // Needed for b/c in getFinalGroupName
 682                 return '-';
 683         }
 684 }