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         // Function name called by the default execute()
  49         private $mFunction;
  50
  51         // File which needs to be included before the function above can be called
  52         private $mFile;
  53
  54         // Whether or not this special page is being included from an article
  55         protected $mIncluding;
  56
  57         // Whether the special page can be included in an article
  58         protected $mIncludable;
  59
  60         /**
  61          * Current request context
  62          * @var IContextSource
  63          */
  64         protected $mContext;
  65
  66         /**
  67          * Get a localised Title object for a specified special page name
  68          *
  69          * @param string $name
  70          * @param string|bool $subpage Subpage string, or false to not use a subpage
  71          * @param string $fragment The link fragment (after the "#")
  72          * @return Title
  73          * @throws MWException
  74          */
  75         public static function getTitleFor( $name, $subpage = false, $fragment = '' ) {
  76                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  77
  78                 return Title::makeTitle( NS_SPECIAL, $name, $fragment );
  79         }
  80
  81         /**
  82          * Get a localised Title object for a page name with a possibly unvalidated subpage
  83          *
  84          * @param string $name
  85          * @param string|bool $subpage Subpage string, or false to not use a subpage
  86          * @return Title|null Title object or null if the page doesn't exist
  87          */
  88         public static function getSafeTitleFor( $name, $subpage = false ) {
  89                 $name = SpecialPageFactory::getLocalNameFor( $name, $subpage );
  90                 if ( $name ) {
  91                         return Title::makeTitleSafe( NS_SPECIAL, $name );
  92                 } else {
  93                         return null;
  94                 }
  95         }
  96
  97         /**
  98          * Default constructor for special pages
  99          * Derivative classes should call this from their constructor
 100          *     Note that if the user does not have the required level, an error message will
 101          *     be displayed by the default execute() method, without the global function ever
 102          *     being called.
 103          *
 104          *     If you override execute(), you can recover the default behavior with userCanExecute()
 105          *     and displayRestrictionError()
 106          *
 107          * @param string $name Name of the special page, as seen in links and URLs
 108          * @param string $restriction User right required, e.g. "block" or "delete"
 109          * @param bool $listed Whether the page is listed in Special:Specialpages
 110          * @param callable|bool $function Function called by execute(). By default
 111          *   it is constructed from $name
 112          * @param string $file File which is included by execute(). It is also
 113          *   constructed from $name by default
 114          * @param bool $includable Whether the page can be included in normal pages
 115          */
 116         public function __construct(
 117                 $name = '', $restriction = '', $listed = true,
 118                 $function = false, $file = 'default', $includable = false
 119         ) {
 120                 $this->mName = $name;
 121                 $this->mRestriction = $restriction;
 122                 $this->mListed = $listed;
 123                 $this->mIncludable = $includable;
 124                 if ( !$function ) {
 125                         $this->mFunction = 'wfSpecial' . $name;
 126                 } else {
 127                         $this->mFunction = $function;
 128                 }
 129                 if ( $file === 'default' ) {
 130                         $this->mFile = __DIR__ . "/specials/Special$name.php";
 131                 } else {
 132                         $this->mFile = $file;
 133                 }
 134         }
 135
 136         /**
 137          * Get the name of this Special Page.
 138          * @return string
 139          */
 140         function getName() {
 141                 return $this->mName;
 142         }
 143
 144         /**
 145          * Get the permission that a user must have to execute this page
 146          * @return string
 147          */
 148         function getRestriction() {
 149                 return $this->mRestriction;
 150         }
 151
 152         /**
 153          * Get the file which will be included by SpecialPage::execute() if your extension is
 154          * still stuck in the past and hasn't overridden the execute() method.  No modern code
 155          * should want or need to know this.
 156          * @return string
 157          * @deprecated since 1.18
 158          */
 159         function getFile() {
 160                 wfDeprecated( __METHOD__, '1.18' );
 161
 162                 return $this->mFile;
 163         }
 164
 165         // @todo FIXME: Decide which syntax to use for this, and stick to it
 166         /**
 167          * Whether this special page is listed in Special:SpecialPages
 168          * @since r3583 (v1.3)
 169          * @return bool
 170          */
 171         function isListed() {
 172                 return $this->mListed;
 173         }
 174
 175         /**
 176          * Set whether this page is listed in Special:Specialpages, at run-time
 177          * @since 1.3
 178          * @param bool $listed
 179          * @return bool
 180          */
 181         function setListed( $listed ) {
 182                 return wfSetVar( $this->mListed, $listed );
 183         }
 184
 185         /**
 186          * Get or set whether this special page is listed in Special:SpecialPages
 187          * @since 1.6
 188          * @param bool $x
 189          * @return bool
 190          */
 191         function listed( $x = null ) {
 192                 return wfSetVar( $this->mListed, $x );
 193         }
 194
 195         /**
 196          * Whether it's allowed to transclude the special page via {{Special:Foo/params}}
 197          * @return bool
 198          */
 199         public function isIncludable() {
 200                 return $this->mIncludable;
 201         }
 202
 203         /**
 204          * Whether the special page is being evaluated via transclusion
 205          * @param bool $x
 206          * @return bool
 207          */
 208         function including( $x = null ) {
 209                 return wfSetVar( $this->mIncluding, $x );
 210         }
 211
 212         /**
 213          * Get the localised name of the special page
 214          * @return string
 215          */
 216         function getLocalName() {
 217                 if ( !isset( $this->mLocalName ) ) {
 218                         $this->mLocalName = SpecialPageFactory::getLocalNameFor( $this->mName );
 219                 }
 220
 221                 return $this->mLocalName;
 222         }
 223
 224         /**
 225          * Is this page expensive (for some definition of expensive)?
 226          * Expensive pages are disabled or cached in miser mode.  Originally used
 227          * (and still overridden) by QueryPage and subclasses, moved here so that
 228          * Special:SpecialPages can safely call it for all special pages.
 229          *
 230          * @return bool
 231          */
 232         public function isExpensive() {
 233                 return false;
 234         }
 235
 236         /**
 237          * Is this page cached?
 238          * Expensive pages are cached or disabled in miser mode.
 239          * Used by QueryPage and subclasses, moved here so that
 240          * Special:SpecialPages can safely call it for all special pages.
 241          *
 242          * @return bool
 243          * @since 1.21
 244          */
 245         public function isCached() {
 246                 return false;
 247         }
 248
 249         /**
 250          * Can be overridden by subclasses with more complicated permissions
 251          * schemes.
 252          *
 253          * @return bool Should the page be displayed with the restricted-access
 254          *   pages?
 255          */
 256         public function isRestricted() {
 257                 // DWIM: If anons can do something, then it is not restricted
 258                 return $this->mRestriction != '' && !User::groupHasPermission( '*', $this->mRestriction );
 259         }
 260
 261         /**
 262          * Checks if the given user (identified by an object) can execute this
 263          * special page (as defined by $mRestriction).  Can be overridden by sub-
 264          * classes with more complicated permissions schemes.
 265          *
 266          * @param User $user The user to check
 267          * @return bool Does the user have permission to view the page?
 268          */
 269         public function userCanExecute( User $user ) {
 270                 return $user->isAllowed( $this->mRestriction );
 271         }
 272
 273         /**
 274          * Output an error message telling the user what access level they have to have
 275          * @throws PermissionsError
 276          */
 277         function displayRestrictionError() {
 278                 throw new PermissionsError( $this->mRestriction );
 279         }
 280
 281         /**
 282          * Checks if userCanExecute, and if not throws a PermissionsError
 283          *
 284          * @since 1.19
 285          * @return void
 286          * @throws PermissionsError
 287          */
 288         public function checkPermissions() {
 289                 if ( !$this->userCanExecute( $this->getUser() ) ) {
 290                         $this->displayRestrictionError();
 291                 }
 292         }
 293
 294         /**
 295          * If the wiki is currently in readonly mode, throws a ReadOnlyError
 296          *
 297          * @since 1.19
 298          * @return void
 299          * @throws ReadOnlyError
 300          */
 301         public function checkReadOnly() {
 302                 if ( wfReadOnly() ) {
 303                         throw new ReadOnlyError;
 304                 }
 305         }
 306
 307         /**
 308          * If the user is not logged in, throws UserNotLoggedIn error.
 309          *
 310          * Default error message includes a link to Special:Userlogin with properly set 'returnto' query
 311          * parameter.
 312          *
 313          * @since 1.23
 314          * @param string|Message $reasonMsg [optional] Passed on to UserNotLoggedIn constructor. Strings
 315          *     will be used as message keys. If a string is given, the message will also receive a
 316          *     formatted login link (generated using the 'loginreqlink' message) as first parameter. If a
 317          *     Message is given, it will be passed on verbatim.
 318          * @param string|Message $titleMsg [optional] Passed on to UserNotLoggedIn constructor. Strings
 319          *     will be used as message keys.
 320          * @throws UserNotLoggedIn
 321          */
 322         public function requireLogin( $reasonMsg = null, $titleMsg = null ) {
 323                 if ( $this->getUser()->isAnon() ) {
 324                         // Use default messages if not given or explicit null passed
 325                         if ( !$reasonMsg ) {
 326                                 $reasonMsg = 'exception-nologin-text-manual';
 327                         }
 328                         if ( !$titleMsg ) {
 329                                 $titleMsg = 'exception-nologin';
 330                         }
 331
 332                         // Convert to Messages with current context
 333                         if ( is_string( $reasonMsg ) ) {
 334                                 $loginreqlink = Linker::linkKnown(
 335                                         SpecialPage::getTitleFor( 'Userlogin' ),
 336                                         $this->msg( 'loginreqlink' )->escaped(),
 337                                         array(),
 338                                         array( 'returnto' => $this->getPageTitle()->getPrefixedText() )
 339                                 );
 340                                 $reasonMsg = $this->msg( $reasonMsg )->rawParams( $loginreqlink );
 341                         }
 342                         if ( is_string( $titleMsg ) ) {
 343                                 $titleMsg = $this->msg( $titleMsg );
 344                         }
 345
 346                         throw new UserNotLoggedIn( $reasonMsg, $titleMsg );
 347                 }
 348         }
 349
 350         /**
 351          * Sets headers - this should be called from the execute() method of all derived classes!
 352          */
 353         function setHeaders() {
 354                 $out = $this->getOutput();
 355                 $out->setArticleRelated( false );
 356                 $out->setRobotPolicy( $this->getRobotPolicy() );
 357                 $out->setPageTitle( $this->getDescription() );
 358         }
 359
 360         /**
 361          * Entry point.
 362          *
 363          * @since 1.20
 364          *
 365          * @param string|null $subPage
 366          */
 367         final public function run( $subPage ) {
 368                 /**
 369                  * Gets called before @see SpecialPage::execute.
 370                  *
 371                  * @since 1.20
 372                  *
 373                  * @param SpecialPage $this
 374                  * @param string|null $subPage
 375                  */
 376                 wfRunHooks( 'SpecialPageBeforeExecute', array( $this, $subPage ) );
 377
 378                 $this->beforeExecute( $subPage );
 379                 $this->execute( $subPage );
 380                 $this->afterExecute( $subPage );
 381
 382                 /**
 383                  * Gets called after @see SpecialPage::execute.
 384                  *
 385                  * @since 1.20
 386                  *
 387                  * @param SpecialPage $this
 388                  * @param string|null $subPage
 389                  */
 390                 wfRunHooks( 'SpecialPageAfterExecute', array( $this, $subPage ) );
 391         }
 392
 393         /**
 394          * Gets called before @see SpecialPage::execute.
 395          *
 396          * @since 1.20
 397          *
 398          * @param string|null $subPage
 399          */
 400         protected function beforeExecute( $subPage ) {
 401                 // No-op
 402         }
 403
 404         /**
 405          * Gets called after @see SpecialPage::execute.
 406          *
 407          * @since 1.20
 408          *
 409          * @param string|null $subPage
 410          */
 411         protected function afterExecute( $subPage ) {
 412                 // No-op
 413         }
 414
 415         /**
 416          * Default execute method
 417          * Checks user permissions, calls the function given in mFunction
 418          *
 419          * This must be overridden by subclasses; it will be made abstract in a future version
 420          *
 421          * @param string|null $subPage
 422          */
 423         public function execute( $subPage ) {
 424                 $this->setHeaders();
 425                 $this->checkPermissions();
 426
 427                 $func = $this->mFunction;
 428                 // only load file if the function does not exist
 429                 if ( !is_callable( $func ) && $this->mFile ) {
 430                         require_once $this->mFile;
 431                 }
 432                 $this->outputHeader();
 433                 call_user_func( $func, $subPage, $this );
 434         }
 435
 436         /**
 437          * Outputs a summary message on top of special pages
 438          * Per default the message key is the canonical name of the special page
 439          * May be overridden, i.e. by extensions to stick with the naming conventions
 440          * for message keys: 'extensionname-xxx'
 441          *
 442          * @param string $summaryMessageKey Message key of the summary
 443          */
 444         function outputHeader( $summaryMessageKey = '' ) {
 445                 global $wgContLang;
 446
 447                 if ( $summaryMessageKey == '' ) {
 448                         $msg = $wgContLang->lc( $this->getName() ) . '-summary';
 449                 } else {
 450                         $msg = $summaryMessageKey;
 451                 }
 452                 if ( !$this->msg( $msg )->isDisabled() && !$this->including() ) {
 453                         $this->getOutput()->wrapWikiMsg(
 454                                 "<div class='mw-specialpage-summary'>\n$1\n</div>", $msg );
 455                 }
 456         }
 457
 458         /**
 459          * Returns the name that goes in the \<h1\> in the special page itself, and
 460          * also the name that will be listed in Special:Specialpages
 461          *
 462          * Derived classes can override this, but usually it is easier to keep the
 463          * default behavior.
 464          *
 465          * @return string
 466          */
 467         function getDescription() {
 468                 return $this->msg( strtolower( $this->mName ) )->text();
 469         }
 470
 471         /**
 472          * Get a self-referential title object
 473          *
 474          * @param string|bool $subpage
 475          * @return Title
 476          * @deprecated in 1.23, use SpecialPage::getPageTitle
 477          */
 478         function getTitle( $subpage = false ) {
 479                 return $this->getPageTitle( $subpage );
 480         }
 481
 482         /**
 483          * Get a self-referential title object
 484          *
 485          * @param string|bool $subpage
 486          * @return Title
 487          * @since 1.23
 488          */
 489         function getPageTitle( $subpage = false ) {
 490                 return self::getTitleFor( $this->mName, $subpage );
 491         }
 492
 493         /**
 494          * Sets the context this SpecialPage is executed in
 495          *
 496          * @param IContextSource $context
 497          * @since 1.18
 498          */
 499         public function setContext( $context ) {
 500                 $this->mContext = $context;
 501         }
 502
 503         /**
 504          * Gets the context this SpecialPage is executed in
 505          *
 506          * @return IContextSource|RequestContext
 507          * @since 1.18
 508          */
 509         public function getContext() {
 510                 if ( $this->mContext instanceof IContextSource ) {
 511                         return $this->mContext;
 512                 } else {
 513                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
 514                                 "Return RequestContext::getMain(); for sanity\n" );
 515
 516                         return RequestContext::getMain();
 517                 }
 518         }
 519
 520         /**
 521          * Get the WebRequest being used for this instance
 522          *
 523          * @return WebRequest
 524          * @since 1.18
 525          */
 526         public function getRequest() {
 527                 return $this->getContext()->getRequest();
 528         }
 529
 530         /**
 531          * Get the OutputPage being used for this instance
 532          *
 533          * @return OutputPage
 534          * @since 1.18
 535          */
 536         public function getOutput() {
 537                 return $this->getContext()->getOutput();
 538         }
 539
 540         /**
 541          * Shortcut to get the User executing this instance
 542          *
 543          * @return User
 544          * @since 1.18
 545          */
 546         public function getUser() {
 547                 return $this->getContext()->getUser();
 548         }
 549
 550         /**
 551          * Shortcut to get the skin being used for this instance
 552          *
 553          * @return Skin
 554          * @since 1.18
 555          */
 556         public function getSkin() {
 557                 return $this->getContext()->getSkin();
 558         }
 559
 560         /**
 561          * Shortcut to get user's language
 562          *
 563          * @deprecated since 1.19 Use getLanguage instead
 564          * @return Language
 565          * @since 1.18
 566          */
 567         public function getLang() {
 568                 wfDeprecated( __METHOD__, '1.19' );
 569
 570                 return $this->getLanguage();
 571         }
 572
 573         /**
 574          * Shortcut to get user's language
 575          *
 576          * @return Language
 577          * @since 1.19
 578          */
 579         public function getLanguage() {
 580                 return $this->getContext()->getLanguage();
 581         }
 582
 583         /**
 584          * Return the full title, including $par
 585          *
 586          * @return Title
 587          * @since 1.18
 588          */
 589         public function getFullTitle() {
 590                 return $this->getContext()->getTitle();
 591         }
 592
 593         /**
 594          * Return the robot policy. Derived classes that override this can change
 595          * the robot policy set by setHeaders() from the default 'noindex,nofollow'.
 596          *
 597          * @return string
 598          * @since 1.23
 599          */
 600         protected function getRobotPolicy() {
 601                 return 'noindex,nofollow';
 602         }
 603
 604         /**
 605          * Wrapper around wfMessage that sets the current context.
 606          *
 607          * @return Message
 608          * @see wfMessage
 609          */
 610         public function msg( /* $args */ ) {
 611                 $message = call_user_func_array(
 612                         array( $this->getContext(), 'msg' ),
 613                         func_get_args()
 614                 );
 615                 // RequestContext passes context to wfMessage, and the language is set from
 616                 // the context, but setting the language for Message class removes the
 617                 // interface message status, which breaks for example usernameless gender
 618                 // invocations. Restore the flag when not including special page in content.
 619                 if ( $this->including() ) {
 620                         $message->setInterfaceMessageFlag( false );
 621                 }
 622
 623                 return $message;
 624         }
 625
 626         /**
 627          * Adds RSS/atom links
 628          *
 629          * @param array $params
 630          */
 631         protected function addFeedLinks( $params ) {
 632                 global $wgFeedClasses;
 633
 634                 $feedTemplate = wfScript( 'api' );
 635
 636                 foreach ( $wgFeedClasses as $format => $class ) {
 637                         $theseParams = $params + array( 'feedformat' => $format );
 638                         $url = wfAppendQuery( $feedTemplate, $theseParams );
 639                         $this->getOutput()->addFeedLink( $format, $url );
 640                 }
 641         }
 642
 643         /**
 644          * Get the group that the special page belongs in on Special:SpecialPage
 645          * Use this method, instead of getGroupName to allow customization
 646          * of the group name from the wiki side
 647          *
 648          * @return string Group of this special page
 649          * @since 1.21
 650          */
 651         public function getFinalGroupName() {
 652                 global $wgSpecialPageGroups;
 653                 $name = $this->getName();
 654
 655                 // Allow overbidding the group from the wiki side
 656                 $msg = $this->msg( 'specialpages-specialpagegroup-' . strtolower( $name ) )->inContentLanguage();
 657                 if ( !$msg->isBlank() ) {
 658                         $group = $msg->text();
 659                 } else {
 660                         // Than use the group from this object
 661                         $group = $this->getGroupName();
 662
 663                         // Group '-' is used as default to have the chance to determine,
 664                         // if the special pages overrides this method,
 665                         // if not overridden, $wgSpecialPageGroups is checked for b/c
 666                         if ( $group === '-' && isset( $wgSpecialPageGroups[$name] ) ) {
 667                                 $group = $wgSpecialPageGroups[$name];
 668                         }
 669                 }
 670
 671                 // never give '-' back, change to 'other'
 672                 if ( $group === '-' ) {
 673                         $group = 'other';
 674                 }
 675
 676                 return $group;
 677         }
 678
 679         /**
 680          * Under which header this special page is listed in Special:SpecialPages
 681          * See messages 'specialpages-group-*' for valid names
 682          * This method defaults to group 'other'
 683          *
 684          * @return string
 685          * @since 1.21
 686          */
 687         protected function getGroupName() {
 688                 // '-' used here to determine, if this group is overridden or has a hardcoded 'other'
 689                 // Needed for b/c in getFinalGroupName
 690                 return '-';
 691         }
 692 }