includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * See design.txt for an overview.
  11  * Note: edit user interface and cache support functions have been
  12  * moved to separate EditPage and HTMLFileCache classes.
  13  *
  14  */
  15 class Article {
  16         /**@{{
  17          * @private
  18          */
  19         var $mComment = '';               //!<
  20         var $mContent;                    //!<
  21         var $mContentLoaded = false;      //!<
  22         var $mCounter = -1;               //!< Not loaded
  23         var $mCurID = -1;                 //!< Not loaded
  24         var $mDataLoaded = false;         //!<
  25         var $mForUpdate = false;          //!<
  26         var $mGoodAdjustment = 0;         //!<
  27         var $mIsRedirect = false;         //!<
  28         var $mLatest = false;             //!<
  29         var $mMinorEdit;                  //!<
  30         var $mOldId;                      //!<
  31         var $mPreparedEdit = false;       //!< Title object if set
  32         var $mRedirectedFrom = null;      //!< Title object if set
  33         var $mRedirectTarget = null;      //!< Title object if set
  34         var $mRedirectUrl = false;        //!<
  35         var $mRevIdFetched = 0;           //!<
  36         var $mRevision;                   //!<
  37         var $mTimestamp = '';             //!<
  38         var $mTitle;                      //!<
  39         var $mTotalAdjustment = 0;        //!<
  40         var $mTouched = '19700101000000'; //!<
  41         var $mUser = -1;                  //!< Not loaded
  42         var $mUserText = '';              //!<
  43         /**@}}*/
  44
  45         /**
  46          * Constructor and clear the article
  47          * @param $title Reference to a Title object.
  48          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  49          */
  50         public function __construct( Title $title, $oldId = null ) {
  51                 $this->mTitle =& $title;
  52                 $this->mOldId = $oldId;
  53         }
  54
  55         /**
  56          * Constructor from an article article
  57          * @param $id The article ID to load
  58          */
  59         public static function newFromID( $id ) {
  60                 $t = Title::newFromID( $id );
  61                 return $t == null ? null : new Article( $t );
  62         }
  63
  64         /**
  65          * Tell the page view functions that this view was redirected
  66          * from another page on the wiki.
  67          * @param $from Title object.
  68          */
  69         public function setRedirectedFrom( $from ) {
  70                 $this->mRedirectedFrom = $from;
  71         }
  72
  73         /**
  74          * If this page is a redirect, get its target
  75          *
  76          * The target will be fetched from the redirect table if possible.
  77          * If this page doesn't have an entry there, call insertRedirect()
  78          * @return mixed Title object, or null if this page is not a redirect
  79          */
  80         public function getRedirectTarget() {
  81                 if( !$this->mTitle || !$this->mTitle->isRedirect() )
  82                         return null;
  83                 if( !is_null($this->mRedirectTarget) )
  84                         return $this->mRedirectTarget;
  85                 # Query the redirect table
  86                 $dbr = wfGetDB( DB_SLAVE );
  87                 $row = $dbr->selectRow( 'redirect',
  88                         array('rd_namespace', 'rd_title'),
  89                         array('rd_from' => $this->getID() ),
  90                         __METHOD__
  91                 );
  92                 if( $row ) {
  93                         return $this->mRedirectTarget = Title::makeTitle($row->rd_namespace, $row->rd_title);
  94                 }
  95                 # This page doesn't have an entry in the redirect table
  96                 return $this->mRedirectTarget = $this->insertRedirect();
  97         }
  98
  99         /**
 100          * Insert an entry for this page into the redirect table.
 101          *
 102          * Don't call this function directly unless you know what you're doing.
 103          * @return Title object
 104          */
 105         public function insertRedirect() {
 106                 $retval = Title::newFromRedirect( $this->getContent() );
 107                 if( !$retval ) {
 108                         return null;
 109                 }
 110                 $dbw = wfGetDB( DB_MASTER );
 111                 $dbw->replace( 'redirect', array('rd_from'),
 112                         array(
 113                                 'rd_from' => $this->getID(),
 114                                 'rd_namespace' => $retval->getNamespace(),
 115                                 'rd_title' => $retval->getDBKey()
 116                         ),
 117                         __METHOD__
 118                 );
 119                 return $retval;
 120         }
 121
 122         /**
 123          * Get the Title object this page redirects to
 124          *
 125          * @return mixed false, Title of in-wiki target, or string with URL
 126          */
 127         public function followRedirect() {
 128                 $text = $this->getContent();
 129                 return $this->followRedirectText( $text );
 130         }
 131
 132         /**
 133          * Get the Title object this text redirects to
 134          *
 135          * @return mixed false, Title of in-wiki target, or string with URL
 136          */
 137         public function followRedirectText( $text ) {
 138                 $rt = Title::newFromRedirectRecurse( $text ); // recurse through to only get the final target
 139                 # process if title object is valid and not special:userlogout
 140                 if( $rt ) {
 141                         if( $rt->getInterwiki() != '' ) {
 142                                 if( $rt->isLocal() ) {
 143                                         // Offsite wikis need an HTTP redirect.
 144                                         //
 145                                         // This can be hard to reverse and may produce loops,
 146                                         // so they may be disabled in the site configuration.
 147                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 148                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 149                                 }
 150                         } else {
 151                                 if( $rt->getNamespace() == NS_SPECIAL ) {
 152                                         // Gotta handle redirects to special pages differently:
 153                                         // Fill the HTTP response "Location" header and ignore
 154                                         // the rest of the page we're on.
 155                                         //
 156                                         // This can be hard to reverse, so they may be disabled.
 157                                         if( $rt->isSpecial( 'Userlogout' ) ) {
 158                                                 // rolleyes
 159                                         } else {
 160                                                 return $rt->getFullURL();
 161                                         }
 162                                 }
 163                                 return $rt;
 164                         }
 165                 }
 166                 // No or invalid redirect
 167                 return false;
 168         }
 169
 170         /**
 171          * get the title object of the article
 172          */
 173         public function getTitle() {
 174                 return $this->mTitle;
 175         }
 176
 177         /**
 178          * Clear the object
 179          * @private
 180          */
 181         public function clear() {
 182                 $this->mDataLoaded    = false;
 183                 $this->mContentLoaded = false;
 184
 185                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 186                 $this->mRedirectedFrom = null; # Title object if set
 187                 $this->mRedirectTarget = null; # Title object if set
 188                 $this->mUserText =
 189                 $this->mTimestamp = $this->mComment = '';
 190                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 191                 $this->mTouched = '19700101000000';
 192                 $this->mForUpdate = false;
 193                 $this->mIsRedirect = false;
 194                 $this->mRevIdFetched = 0;
 195                 $this->mRedirectUrl = false;
 196                 $this->mLatest = false;
 197                 $this->mPreparedEdit = false;
 198         }
 199
 200         /**
 201          * Note that getContent/loadContent do not follow redirects anymore.
 202          * If you need to fetch redirectable content easily, try
 203          * the shortcut in Article::followContent()
 204          *
 205          * @return Return the text of this revision
 206         */
 207         public function getContent() {
 208                 global $wgUser, $wgContLang, $wgOut, $wgMessageCache;
 209                 wfProfileIn( __METHOD__ );
 210                 if( $this->getID() === 0 ) {
 211                         # If this is a MediaWiki:x message, then load the messages
 212                         # and return the message value for x.
 213                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 214                                 # If this is a system message, get the default text.
 215                                 list( $message, $lang ) = $wgMessageCache->figureMessage( $wgContLang->lcfirst( $this->mTitle->getText() ) );
 216                                 $wgMessageCache->loadAllMessages( $lang );
 217                                 $text = wfMsgGetKey( $message, false, $lang, false );
 218                                 if( wfEmptyMsg( $message, $text ) )
 219                                         $text = '';
 220                         } else {
 221                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 222                         }
 223                         wfProfileOut( __METHOD__ );
 224                         return $text;
 225                 } else {
 226                         $this->loadContent();
 227                         wfProfileOut( __METHOD__ );
 228                         return $this->mContent;
 229                 }
 230         }
 231
 232         /**
 233          * Get the text of the current revision. No side-effects...
 234          *
 235          * @return Return the text of the current revision
 236         */
 237         public function getRawText() {
 238                 // Check process cache for current revision
 239                 if( $this->mContentLoaded && $this->mOldId == 0 ) {
 240                         return $this->mContent;
 241                 }
 242                 $rev = Revision::newFromTitle( $this->mTitle );
 243                 $text = $rev ? $rev->getRawText() : false;
 244                 return $text;
 245         }
 246
 247         /**
 248          * This function returns the text of a section, specified by a number ($section).
 249          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 250          * the first section before any such heading (section 0).
 251          *
 252          * If a section contains subsections, these are also returned.
 253          *
 254          * @param $text String: text to look in
 255          * @param $section Integer: section number
 256          * @return string text of the requested section
 257          * @deprecated
 258          */
 259         public function getSection( $text, $section ) {
 260                 global $wgParser;
 261                 return $wgParser->getSection( $text, $section );
 262         }
 263
 264         /**
 265          * Get the text that needs to be saved in order to undo all revisions
 266          * between $undo and $undoafter. Revisions must belong to the same page,
 267          * must exist and must not be deleted
 268          * @param $undo Revision
 269          * @param $undoafter Revision Must be an earlier revision than $undo
 270          * @return mixed string on success, false on failure
 271          */
 272         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 273                 $undo_text = $undo->getText();
 274                 $undoafter_text = $undoafter->getText();
 275                 $cur_text = $this->getContent();
 276                 if ( $cur_text == $undo_text ) {
 277                         # No use doing a merge if it's just a straight revert.
 278                         return $undoafter_text;
 279                 }
 280                 $undone_text = '';
 281                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) )
 282                         return false;
 283                 return $undone_text;
 284         }
 285
 286         /**
 287          * @return int The oldid of the article that is to be shown, 0 for the
 288          *             current revision
 289          */
 290         public function getOldID() {
 291                 if( is_null( $this->mOldId ) ) {
 292                         $this->mOldId = $this->getOldIDFromRequest();
 293                 }
 294                 return $this->mOldId;
 295         }
 296
 297         /**
 298          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 299          *
 300          * @return int The old id for the request
 301          */
 302         public function getOldIDFromRequest() {
 303                 global $wgRequest;
 304                 $this->mRedirectUrl = false;
 305                 $oldid = $wgRequest->getVal( 'oldid' );
 306                 if( isset( $oldid ) ) {
 307                         $oldid = intval( $oldid );
 308                         if( $wgRequest->getVal( 'direction' ) == 'next' ) {
 309                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 310                                 if( $nextid  ) {
 311                                         $oldid = $nextid;
 312                                 } else {
 313                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 314                                 }
 315                         } elseif( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 316                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 317                                 if( $previd ) {
 318                                         $oldid = $previd;
 319                                 }
 320                         }
 321                 }
 322                 if( !$oldid ) {
 323                         $oldid = 0;
 324                 }
 325                 return $oldid;
 326         }
 327
 328         /**
 329          * Load the revision (including text) into this object
 330          */
 331         function loadContent() {
 332                 if( $this->mContentLoaded ) return;
 333                 wfProfileIn( __METHOD__ );
 334                 # Query variables :P
 335                 $oldid = $this->getOldID();
 336                 # Pre-fill content with error message so that if something
 337                 # fails we'll have something telling us what we intended.
 338                 $this->mOldId = $oldid;
 339                 $this->fetchContent( $oldid );
 340                 wfProfileOut( __METHOD__ );
 341         }
 342
 343
 344         /**
 345          * Fetch a page record with the given conditions
 346          * @param $dbr Database object
 347          * @param $conditions Array
 348          */
 349         protected function pageData( $dbr, $conditions ) {
 350                 $fields = array(
 351                                 'page_id',
 352                                 'page_namespace',
 353                                 'page_title',
 354                                 'page_restrictions',
 355                                 'page_counter',
 356                                 'page_is_redirect',
 357                                 'page_is_new',
 358                                 'page_random',
 359                                 'page_touched',
 360                                 'page_latest',
 361                                 'page_len',
 362                 );
 363                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 364                 $row = $dbr->selectRow(
 365                         'page',
 366                         $fields,
 367                         $conditions,
 368                         __METHOD__
 369                 );
 370                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 371                 return $row ;
 372         }
 373
 374         /**
 375          * @param $dbr Database object
 376          * @param $title Title object
 377          */
 378         public function pageDataFromTitle( $dbr, $title ) {
 379                 return $this->pageData( $dbr, array(
 380                         'page_namespace' => $title->getNamespace(),
 381                         'page_title'     => $title->getDBkey() ) );
 382         }
 383
 384         /**
 385          * @param $dbr Database
 386          * @param $id Integer
 387          */
 388         protected function pageDataFromId( $dbr, $id ) {
 389                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 390         }
 391
 392         /**
 393          * Set the general counter, title etc data loaded from
 394          * some source.
 395          *
 396          * @param $data Database row object or "fromdb"
 397          */
 398         public function loadPageData( $data = 'fromdb' ) {
 399                 if( $data === 'fromdb' ) {
 400                         $dbr = wfGetDB( DB_MASTER );
 401                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 402                 }
 403
 404                 $lc = LinkCache::singleton();
 405                 if( $data ) {
 406                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect );
 407
 408                         $this->mTitle->mArticleID = $data->page_id;
 409
 410                         # Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mCounter     = $data->page_counter;
 414                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mIsRedirect  = $data->page_is_redirect;
 416                         $this->mLatest      = $data->page_latest;
 417                 } else {
 418                         if( is_object( $this->mTitle ) ) {
 419                                 $lc->addBadLinkObj( $this->mTitle );
 420                         }
 421                         $this->mTitle->mArticleID = 0;
 422                 }
 423
 424                 $this->mDataLoaded  = true;
 425         }
 426
 427         /**
 428          * Get text of an article from database
 429          * Does *NOT* follow redirects.
 430          * @param $oldid Int: 0 for whatever the latest revision is
 431          * @return string
 432          */
 433         function fetchContent( $oldid = 0 ) {
 434                 if( $this->mContentLoaded ) {
 435                         return $this->mContent;
 436                 }
 437
 438                 $dbr = wfGetDB( DB_MASTER );
 439
 440                 # Pre-fill content with error message so that if something
 441                 # fails we'll have something telling us what we intended.
 442                 $t = $this->mTitle->getPrefixedText();
 443                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 444                 $this->mContent = wfMsg( 'missing-article', $t, $d ) ;
 445
 446                 if( $oldid ) {
 447                         $revision = Revision::newFromId( $oldid );
 448                         if( is_null( $revision ) ) {
 449                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 450                                 return false;
 451                         }
 452                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 453                         if( !$data ) {
 454                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 455                                 return false;
 456                         }
 457                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 458                         $this->loadPageData( $data );
 459                 } else {
 460                         if( !$this->mDataLoaded ) {
 461                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 462                                 if( !$data ) {
 463                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 464                                         return false;
 465                                 }
 466                                 $this->loadPageData( $data );
 467                         }
 468                         $revision = Revision::newFromId( $this->mLatest );
 469                         if( is_null( $revision ) ) {
 470                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$this->mLatest}\n" );
 471                                 return false;
 472                         }
 473                 }
 474
 475                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 476                 // We should instead work with the Revision object when we need it...
 477                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 478
 479                 $this->mUser      = $revision->getUser();
 480                 $this->mUserText  = $revision->getUserText();
 481                 $this->mComment   = $revision->getComment();
 482                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 483
 484                 $this->mRevIdFetched = $revision->getId();
 485                 $this->mContentLoaded = true;
 486                 $this->mRevision =& $revision;
 487
 488                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 489
 490                 return $this->mContent;
 491         }
 492
 493         /**
 494          * Read/write accessor to select FOR UPDATE
 495          *
 496          * @param $x Mixed: FIXME
 497          */
 498         public function forUpdate( $x = NULL ) {
 499                 return wfSetVar( $this->mForUpdate, $x );
 500         }
 501
 502         /**
 503          * Get the database which should be used for reads
 504          *
 505          * @return Database
 506          * @deprecated - just call wfGetDB( DB_MASTER ) instead
 507          */
 508         function getDB() {
 509                 wfDeprecated( __METHOD__ );
 510                 return wfGetDB( DB_MASTER );
 511         }
 512
 513         /**
 514          * Get options for all SELECT statements
 515          *
 516          * @param $options Array: an optional options array which'll be appended to
 517          *                       the default
 518          * @return Array: options
 519          */
 520         protected function getSelectOptions( $options = '' ) {
 521                 if( $this->mForUpdate ) {
 522                         if( is_array( $options ) ) {
 523                                 $options[] = 'FOR UPDATE';
 524                         } else {
 525                                 $options = 'FOR UPDATE';
 526                         }
 527                 }
 528                 return $options;
 529         }
 530
 531         /**
 532          * @return int Page ID
 533          */
 534         public function getID() {
 535                 if( $this->mTitle ) {
 536                         return $this->mTitle->getArticleID();
 537                 } else {
 538                         return 0;
 539                 }
 540         }
 541
 542         /**
 543          * @return bool Whether or not the page exists in the database
 544          */
 545         public function exists() {
 546                 return $this->getId() > 0;
 547         }
 548
 549         /**
 550          * Check if this page is something we're going to be showing
 551          * some sort of sensible content for. If we return false, page
 552          * views (plain action=view) will return an HTTP 404 response,
 553          * so spiders and robots can know they're following a bad link.
 554          *
 555          * @return bool
 556          */
 557         public function hasViewableContent() {
 558                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 559         }
 560
 561         /**
 562          * @return int The view count for the page
 563          */
 564         public function getCount() {
 565                 if( -1 == $this->mCounter ) {
 566                         $id = $this->getID();
 567                         if( $id == 0 ) {
 568                                 $this->mCounter = 0;
 569                         } else {
 570                                 $dbr = wfGetDB( DB_SLAVE );
 571                                 $this->mCounter = $dbr->selectField( 'page',
 572                                         'page_counter',
 573                                         array( 'page_id' => $id ),
 574                                         __METHOD__,
 575                                         $this->getSelectOptions()
 576                                 );
 577                         }
 578                 }
 579                 return $this->mCounter;
 580         }
 581
 582         /**
 583          * Determine whether a page  would be suitable for being counted as an
 584          * article in the site_stats table based on the title & its content
 585          *
 586          * @param $text String: text to analyze
 587          * @return bool
 588          */
 589         public function isCountable( $text ) {
 590                 global $wgUseCommaCount;
 591
 592                 $token = $wgUseCommaCount ? ',' : '[[';
 593                 return $this->mTitle->isContentPage() && !$this->isRedirect($text) && in_string($token,$text);
 594         }
 595
 596         /**
 597          * Tests if the article text represents a redirect
 598          *
 599          * @param $text String: FIXME
 600          * @return bool
 601          */
 602         public function isRedirect( $text = false ) {
 603                 if( $text === false ) {
 604                         if( $this->mDataLoaded ) {
 605                                 return $this->mIsRedirect;
 606                         }
 607                         // Apparently loadPageData was never called
 608                         $this->loadContent();
 609                         $titleObj = Title::newFromRedirectRecurse( $this->fetchContent() );
 610                 } else {
 611                         $titleObj = Title::newFromRedirect( $text );
 612                 }
 613                 return $titleObj !== NULL;
 614         }
 615
 616         /**
 617          * Returns true if the currently-referenced revision is the current edit
 618          * to this page (and it exists).
 619          * @return bool
 620          */
 621         public function isCurrent() {
 622                 # If no oldid, this is the current version.
 623                 if( $this->getOldID() == 0 ) {
 624                         return true;
 625                 }
 626                 return $this->exists() && isset($this->mRevision) && $this->mRevision->isCurrent();
 627         }
 628
 629         /**
 630          * Loads everything except the text
 631          * This isn't necessary for all uses, so it's only done if needed.
 632          */
 633         protected function loadLastEdit() {
 634                 if( -1 != $this->mUser )
 635                         return;
 636
 637                 # New or non-existent articles have no user information
 638                 $id = $this->getID();
 639                 if( 0 == $id ) return;
 640
 641                 $this->mLastRevision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 642                 if( !is_null( $this->mLastRevision ) ) {
 643                         $this->mUser      = $this->mLastRevision->getUser();
 644                         $this->mUserText  = $this->mLastRevision->getUserText();
 645                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 646                         $this->mComment   = $this->mLastRevision->getComment();
 647                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 648                         $this->mRevIdFetched = $this->mLastRevision->getId();
 649                 }
 650         }
 651
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by ParserCache::get()
 654                 if( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657                 return wfTimestamp(TS_MW, $this->mTimestamp);
 658         }
 659
 660         public function getUser() {
 661                 $this->loadLastEdit();
 662                 return $this->mUser;
 663         }
 664
 665         public function getUserText() {
 666                 $this->loadLastEdit();
 667                 return $this->mUserText;
 668         }
 669
 670         public function getComment() {
 671                 $this->loadLastEdit();
 672                 return $this->mComment;
 673         }
 674
 675         public function getMinorEdit() {
 676                 $this->loadLastEdit();
 677                 return $this->mMinorEdit;
 678         }
 679
 680         /* Use this to fetch the rev ID used on page views */
 681         public function getRevIdFetched() {
 682                 $this->loadLastEdit();
 683                 return $this->mRevIdFetched;
 684         }
 685
 686         /**
 687          * @param $limit Integer: default 0.
 688          * @param $offset Integer: default 0.
 689          */
 690         public function getContributors($limit = 0, $offset = 0) {
 691                 # XXX: this is expensive; cache this info somewhere.
 692
 693                 $contribs = array();
 694                 $dbr = wfGetDB( DB_SLAVE );
 695                 $revTable = $dbr->tableName( 'revision' );
 696                 $userTable = $dbr->tableName( 'user' );
 697                 $user = $this->getUser();
 698                 $pageId = $this->getId();
 699
 700                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 701                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 702                         WHERE rev_page = $pageId
 703                         AND rev_user != $user
 704                         GROUP BY rev_user, rev_user_text, user_real_name
 705                         ORDER BY timestamp DESC";
 706
 707                 if($limit > 0) { $sql .= ' LIMIT '.$limit; }
 708                 if($offset > 0) { $sql .= ' OFFSET '.$offset; }
 709
 710                 $sql .= ' '. $this->getSelectOptions();
 711
 712                 $res = $dbr->query($sql, __METHOD__ );
 713
 714                 return new UserArrayFromResult( $res );
 715         }
 716
 717         /**
 718          * This is the default action of the script: just view the page of
 719          * the given title.
 720         */
 721         public function view() {
 722                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 723                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 724                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 725                 global $wgDefaultRobotPolicy;
 726
 727                 wfProfileIn( __METHOD__ );
 728
 729                 # Get variables from query string
 730                 $oldid = $this->getOldID();
 731
 732                 # Try file cache
 733                 if( $oldid === 0 && $this->checkTouched() ) {
 734                         global $wgUseETag;
 735                         if( $wgUseETag ) {
 736                                 $parserCache = ParserCache::singleton();
 737                                 $wgOut->setETag( $parserCache->getETag($this,$wgUser) );
 738                         }
 739                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 740                                 wfProfileOut( __METHOD__ );
 741                                 return;
 742                         } else if( $this->tryFileCache() ) {
 743                                 # tell wgOut that output is taken care of
 744                                 $wgOut->disable();
 745                                 $this->viewUpdates();
 746                                 wfProfileOut( __METHOD__ );
 747                                 return;
 748                         }
 749                 }
 750
 751                 $ns = $this->mTitle->getNamespace(); # shortcut
 752                 $sk = $wgUser->getSkin();
 753
 754                 # getOldID may want us to redirect somewhere else
 755                 if( $this->mRedirectUrl ) {
 756                         $wgOut->redirect( $this->mRedirectUrl );
 757                         wfProfileOut( __METHOD__ );
 758                         return;
 759                 }
 760
 761                 $diff = $wgRequest->getVal( 'diff' );
 762                 $rcid = $wgRequest->getVal( 'rcid' );
 763                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 764                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 765                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 766                 $return404 = false;
 767
 768                 $wgOut->setArticleFlag( true );
 769
 770                 # Discourage indexing of printable versions, but encourage following
 771                 if( $wgOut->isPrintable() ) {
 772                         $policy = 'noindex,follow';
 773                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 774                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 775                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 776                         # Honour customised robot policies for this namespace
 777                         $policy = $wgNamespaceRobotPolicies[$ns];
 778                 } else {
 779                         $policy = $wgDefaultRobotPolicy;
 780                 }
 781                 $wgOut->setRobotPolicy( $policy );
 782
 783                 # Allow admins to see deleted content if explicitly requested
 784                 $delId = $diff ? $diff : $oldid;
 785                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $delId );
 786                 # If we got diff and oldid in the query, we want to see a
 787                 # diff page instead of the article.
 788
 789                 if( !is_null( $diff ) ) {
 790                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 791
 792                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 793                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 794                         // DifferenceEngine directly fetched the revision:
 795                         $this->mRevIdFetched = $de->mNewid;
 796                         $de->showDiffPage( $diffOnly );
 797
 798                         // Needed to get the page's current revision
 799                         $this->loadPageData();
 800                         if( $diff == 0 || $diff == $this->mLatest ) {
 801                                 # Run view updates for current revision only
 802                                 $this->viewUpdates();
 803                         }
 804                         wfProfileOut( __METHOD__ );
 805                         return;
 806                 }
 807
 808                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 809                         # User/User_talk subpages are not modified. (bug 11443)
 810                         if( !$this->mTitle->isSubpage() ) {
 811                                 $block = new Block();
 812                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 813                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 814                                 }
 815                         }
 816                 }
 817
 818                 # Should the parser cache be used?
 819                 $pcache = $this->useParserCache( $oldid );
 820                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 821                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 822                         wfIncrStats( 'pcache_miss_stub' );
 823                 }
 824
 825                 $wasRedirected = false;
 826                 if( isset( $this->mRedirectedFrom ) ) {
 827                         // This is an internally redirected page view.
 828                         // We'll need a backlink to the source page for navigation.
 829                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 830                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 831                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 832                                 $wgOut->setSubtitle( $s );
 833
 834                                 // Set the fragment if one was specified in the redirect
 835                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 836                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 837                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 838                                 }
 839
 840                                 // Add a <link rel="canonical"> tag
 841                                 $wgOut->addLink( array( 'rel' => 'canonical',
 842                                         'href' => $this->mTitle->getLocalURL() )
 843                                 );
 844                                 $wasRedirected = true;
 845                         }
 846                 } elseif( !empty( $rdfrom ) ) {
 847                         // This is an externally redirected view, from some other wiki.
 848                         // If it was reported from a trusted site, supply a backlink.
 849                         global $wgRedirectSources;
 850                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 851                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 852                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 853                                 $wgOut->setSubtitle( $s );
 854                                 $wasRedirected = true;
 855                         }
 856                 }
 857
 858                 $outputDone = false;
 859                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 860                 if( $pcache && $wgOut->tryParserCache( $this, $wgUser ) ) {
 861                         // Ensure that UI elements requiring revision ID have
 862                         // the correct version information.
 863                         $wgOut->setRevisionId( $this->mLatest );
 864                         $outputDone = true;
 865                 }
 866                 # Fetch content and check for errors
 867                 if( !$outputDone ) {
 868                         # If the article does not exist and was deleted, show the log
 869                         if( $this->getID() == 0 ) {
 870                                 $this->showDeletionLog();
 871                         }
 872                         $text = $this->getContent();
 873                         // For now, check also for ID until getContent actually returns
 874                         // false for pages that do not exists
 875                         if( $text === false || $this->getID() === 0 ) {
 876                                 # Failed to load, replace text with error message
 877                                 $t = $this->mTitle->getPrefixedText();
 878                                 if( $oldid ) {
 879                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 880                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 881                                 // Always use page content for pages in the MediaWiki namespace
 882                                 // since it contains the default message
 883                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 884                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 885                                 }
 886                         }
 887
 888                         # Non-existent pages
 889                         if( $this->getID() === 0 ) {
 890                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 891                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 892                                 if( !$this->hasViewableContent() ) {
 893                                         // If there's no backing content, send a 404 Not Found
 894                                         // for better machine handling of broken links.
 895                                         $return404 = true;
 896                                 }
 897                         }
 898
 899                         if( $return404 ) {
 900                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 901                         }
 902
 903                         # Another whitelist check in case oldid is altering the title
 904                         if( !$this->mTitle->userCanRead() ) {
 905                                 $wgOut->loginToUse();
 906                                 $wgOut->output();
 907                                 $wgOut->disable();
 908                                 wfProfileOut( __METHOD__ );
 909                                 return;
 910                         }
 911
 912                         # For ?curid=x urls, disallow indexing
 913                         if( $wgRequest->getInt('curid') )
 914                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 915
 916                         # We're looking at an old revision
 917                         if( !empty( $oldid ) ) {
 918                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 919                                 if( is_null( $this->mRevision ) ) {
 920                                         // FIXME: This would be a nice place to load the 'no such page' text.
 921                                 } else {
 922                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 923                                         # Allow admins to see deleted content if explicitly requested
 924                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 925                                                 if( !$unhide || !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 926                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 927                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 928                                                         wfProfileOut( __METHOD__ );
 929                                                         return;
 930                                                 } else {
 931                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 932                                                         // and we are allowed to see...
 933                                                 }
 934                                         }
 935                                 }
 936                         }
 937
 938                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 939
 940                          // Pages containing custom CSS or JavaScript get special treatment
 941                         if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 942                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 943                                 // Give hooks a chance to customise the output
 944                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 945                                         // Wrap the whole lot in a <pre> and don't parse
 946                                         $m = array();
 947                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 948                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 949                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 950                                         $wgOut->addHTML( "\n</pre>\n" );
 951                                 }
 952                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 953                                 # Don't append the subtitle if this was an old revision
 954                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 955                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 956                                 $wgOut->addParserOutputNoText( $parseout );
 957                         } else if( $pcache ) {
 958                                 # Display content and save to parser cache
 959                                 $this->outputWikiText( $text );
 960                         } else {
 961                                 # Display content, don't attempt to save to parser cache
 962                                 # Don't show section-edit links on old revisions... this way lies madness.
 963                                 if( !$this->isCurrent() ) {
 964                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 965                                 }
 966                                 # Display content and don't save to parser cache
 967                                 # With timing hack -- TS 2006-07-26
 968                                 $time = -wfTime();
 969                                 $this->outputWikiText( $text, false );
 970                                 $time += wfTime();
 971
 972                                 # Timing hack
 973                                 if( $time > 3 ) {
 974                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 975                                                 $this->mTitle->getPrefixedDBkey()));
 976                                 }
 977
 978                                 if( !$this->isCurrent() ) {
 979                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 980                                 }
 981                         }
 982                 }
 983                 /* title may have been set from the cache */
 984                 $t = $wgOut->getPageTitle();
 985                 if( empty( $t ) ) {
 986                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 987
 988                         # For the main page, overwrite the <title> element with the con-
 989                         # tents of 'pagetitle-view-mainpage' instead of the default (if
 990                         # that's not empty).
 991                         if( $this->mTitle->equals( Title::newMainPage() ) &&
 992                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
 993                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
 994                         }
 995                 }
 996
 997                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 998                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
 999                         $wgOut->addWikiMsg('anontalkpagetext');
1000                 }
1001
1002                 # If we have been passed an &rcid= parameter, we want to give the user a
1003                 # chance to mark this new article as patrolled.
1004                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1005                         $wgOut->addHTML(
1006                                 "<div class='patrollink'>" .
1007                                         wfMsgHtml( 'markaspatrolledlink',
1008                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1009                                                 "action=markpatrolled&rcid=$rcid" )
1010                                         ) .
1011                                 '</div>'
1012                          );
1013                 }
1014
1015                 # Trackbacks
1016                 if( $wgUseTrackbacks ) {
1017                         $this->addTrackbacks();
1018                 }
1019
1020                 $this->viewUpdates();
1021                 wfProfileOut( __METHOD__ );
1022         }
1023
1024         protected function showDeletionLog() {
1025                 global $wgUser, $wgOut;
1026                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1027                 $pager = new LogPager( $loglist, 'delete', false, $this->mTitle->getPrefixedText() );
1028                 if( $pager->getNumRows() > 0 ) {
1029                         $pager->mLimit = 10;
1030                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1031                         $wgOut->addWikiMsg( 'deleted-notice' );
1032                         $wgOut->addHTML(
1033                                 $loglist->beginLogEventsList() .
1034                                 $pager->getBody() .
1035                                 $loglist->endLogEventsList()
1036                         );
1037                         if( $pager->getNumRows() > 10 ) {
1038                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1039                                         SpecialPage::getTitleFor( 'Log' ),
1040                                         wfMsgHtml( 'deletelog-fulllog' ),
1041                                         array(),
1042                                         array( 'type' => 'delete', 'page' => $this->mTitle->getPrefixedText() )
1043                                 ) );
1044                         }
1045                         $wgOut->addHTML( '</div>' );
1046                 }
1047         }
1048
1049         /*
1050         * Should the parser cache be used?
1051         */
1052         protected function useParserCache( $oldid ) {
1053                 global $wgUser, $wgEnableParserCache;
1054
1055                 return $wgEnableParserCache
1056                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1057                         && $this->exists()
1058                         && empty( $oldid )
1059                         && !$this->mTitle->isCssOrJsPage()
1060                         && !$this->mTitle->isCssJsSubpage();
1061         }
1062
1063         /**
1064          * View redirect
1065          * @param $target Title object or Array of destination(s) to redirect
1066          * @param $appendSubtitle Boolean [optional]
1067          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1068          */
1069         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1070                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1071                 # Display redirect
1072                 if( !is_array( $target ) ) {
1073                         $target = array( $target );
1074                 }
1075                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1076                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1077                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1078                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1079
1080                 if( $appendSubtitle ) {
1081                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1082                 }
1083                 $sk = $wgUser->getSkin();
1084                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1085                 $title = array_shift( $target );
1086                 if( $forceKnown ) {
1087                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1088                 } else {
1089                         $link = $sk->makeLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1090                 }
1091                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1092                 foreach( $target as $rt ) {
1093                         if( $forceKnown ) {
1094                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1095                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1096                         } else {
1097                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1098                                         . $sk->makeLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1099                         }
1100                 }
1101                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1102                         '<span class="redirectText">'.$link.'</span>';
1103
1104         }
1105
1106         public function addTrackbacks() {
1107                 global $wgOut, $wgUser;
1108                 $dbr = wfGetDB( DB_SLAVE );
1109                 $tbs = $dbr->select( 'trackbacks',
1110                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1111                         array('tb_page' => $this->getID() )
1112                 );
1113                 if( !$dbr->numRows($tbs) ) return;
1114
1115                 $tbtext = "";
1116                 while( $o = $dbr->fetchObject($tbs) ) {
1117                         $rmvtxt = "";
1118                         if( $wgUser->isAllowed( 'trackback' ) ) {
1119                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1120                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1121                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1122                         }
1123                         $tbtext .= "\n";
1124                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1125                                         $o->tb_title,
1126                                         $o->tb_url,
1127                                         $o->tb_ex,
1128                                         $o->tb_name,
1129                                         $rmvtxt);
1130                 }
1131                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1132                 $this->mTitle->invalidateCache();
1133         }
1134
1135         public function deletetrackback() {
1136                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
1137                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1138                         $wgOut->addWikiMsg( 'sessionfailure' );
1139                         return;
1140                 }
1141
1142                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1143                 if( count($permission_errors) ) {
1144                         $wgOut->showPermissionsErrorPage( $permission_errors );
1145                         return;
1146                 }
1147
1148                 $db = wfGetDB( DB_MASTER );
1149                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1150
1151                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1152                 $this->mTitle->invalidateCache();
1153         }
1154
1155         public function render() {
1156                 global $wgOut;
1157                 $wgOut->setArticleBodyOnly(true);
1158                 $this->view();
1159         }
1160
1161         /**
1162          * Handle action=purge
1163          */
1164         public function purge() {
1165                 global $wgUser, $wgRequest, $wgOut;
1166                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1167                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1168                                 $this->doPurge();
1169                                 $this->view();
1170                         }
1171                 } else {
1172                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1173                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1174                         $form = "<form method=\"post\" action=\"$action\">\n" .
1175                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1176                                         "</form>\n";
1177                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1178                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1179                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1180                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1181                         $wgOut->addHTML( $top . $form . $bottom );
1182                 }
1183         }
1184
1185         /**
1186          * Perform the actions of a page purging
1187          */
1188         public function doPurge() {
1189                 global $wgUseSquid;
1190                 // Invalidate the cache
1191                 $this->mTitle->invalidateCache();
1192
1193                 if( $wgUseSquid ) {
1194                         // Commit the transaction before the purge is sent
1195                         $dbw = wfGetDB( DB_MASTER );
1196                         $dbw->immediateCommit();
1197
1198                         // Send purge
1199                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1200                         $update->doUpdate();
1201                 }
1202                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1203                         global $wgMessageCache;
1204                         if( $this->getID() == 0 ) {
1205                                 $text = false;
1206                         } else {
1207                                 $text = $this->getRawText();
1208                         }
1209                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1210                 }
1211         }
1212
1213         /**
1214          * Insert a new empty page record for this article.
1215          * This *must* be followed up by creating a revision
1216          * and running $this->updateToLatest( $rev_id );
1217          * or else the record will be left in a funky state.
1218          * Best if all done inside a transaction.
1219          *
1220          * @param $dbw Database
1221          * @return int The newly created page_id key, or false if the title already existed
1222          * @private
1223          */
1224         public function insertOn( $dbw ) {
1225                 wfProfileIn( __METHOD__ );
1226
1227                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1228                 $dbw->insert( 'page', array(
1229                         'page_id'           => $page_id,
1230                         'page_namespace'    => $this->mTitle->getNamespace(),
1231                         'page_title'        => $this->mTitle->getDBkey(),
1232                         'page_counter'      => 0,
1233                         'page_restrictions' => '',
1234                         'page_is_redirect'  => 0, # Will set this shortly...
1235                         'page_is_new'       => 1,
1236                         'page_random'       => wfRandom(),
1237                         'page_touched'      => $dbw->timestamp(),
1238                         'page_latest'       => 0, # Fill this in shortly...
1239                         'page_len'          => 0, # Fill this in shortly...
1240                 ), __METHOD__, 'IGNORE' );
1241
1242                 $affected = $dbw->affectedRows();
1243                 if( $affected ) {
1244                         $newid = $dbw->insertId();
1245                         $this->mTitle->resetArticleId( $newid );
1246                 }
1247                 wfProfileOut( __METHOD__ );
1248                 return $affected ? $newid : false;
1249         }
1250
1251         /**
1252          * Update the page record to point to a newly saved revision.
1253          *
1254          * @param $dbw Database object
1255          * @param $revision Revision: For ID number, and text used to set
1256                             length and redirect status fields
1257          * @param $lastRevision Integer: if given, will not overwrite the page field
1258          *                      when different from the currently set value.
1259          *                      Giving 0 indicates the new page flag should be set
1260          *                      on.
1261          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1262          *                                                       removing rows in redirect table.
1263          * @return bool true on success, false on failure
1264          * @private
1265          */
1266         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1267                 wfProfileIn( __METHOD__ );
1268
1269                 $text = $revision->getText();
1270                 $rt = Title::newFromRedirect( $text );
1271
1272                 $conditions = array( 'page_id' => $this->getId() );
1273                 if( !is_null( $lastRevision ) ) {
1274                         # An extra check against threads stepping on each other
1275                         $conditions['page_latest'] = $lastRevision;
1276                 }
1277
1278                 $dbw->update( 'page',
1279                         array( /* SET */
1280                                 'page_latest'      => $revision->getId(),
1281                                 'page_touched'     => $dbw->timestamp(),
1282                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1283                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1284                                 'page_len'         => strlen( $text ),
1285                         ),
1286                         $conditions,
1287                         __METHOD__ );
1288
1289                 $result = $dbw->affectedRows() != 0;
1290                 if( $result ) {
1291                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1292                 }
1293
1294                 wfProfileOut( __METHOD__ );
1295                 return $result;
1296         }
1297
1298         /**
1299          * Add row to the redirect table if this is a redirect, remove otherwise.
1300          *
1301          * @param $dbw Database
1302          * @param $redirectTitle a title object pointing to the redirect target,
1303          *                                               or NULL if this is not a redirect
1304          * @param $lastRevIsRedirect If given, will optimize adding and
1305          *                                                       removing rows in redirect table.
1306          * @return bool true on success, false on failure
1307          * @private
1308          */
1309         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1310                 // Always update redirects (target link might have changed)
1311                 // Update/Insert if we don't know if the last revision was a redirect or not
1312                 // Delete if changing from redirect to non-redirect
1313                 $isRedirect = !is_null($redirectTitle);
1314                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1315                         wfProfileIn( __METHOD__ );
1316                         if( $isRedirect ) {
1317                                 // This title is a redirect, Add/Update row in the redirect table
1318                                 $set = array( /* SET */
1319                                         'rd_namespace' => $redirectTitle->getNamespace(),
1320                                         'rd_title'     => $redirectTitle->getDBkey(),
1321                                         'rd_from'      => $this->getId(),
1322                                 );
1323                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1324                         } else {
1325                                 // This is not a redirect, remove row from redirect table
1326                                 $where = array( 'rd_from' => $this->getId() );
1327                                 $dbw->delete( 'redirect', $where, __METHOD__);
1328                         }
1329                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1330                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1331                         }
1332                         wfProfileOut( __METHOD__ );
1333                         return ( $dbw->affectedRows() != 0 );
1334                 }
1335                 return true;
1336         }
1337
1338         /**
1339          * If the given revision is newer than the currently set page_latest,
1340          * update the page record. Otherwise, do nothing.
1341          *
1342          * @param $dbw Database object
1343          * @param $revision Revision object
1344          */
1345         public function updateIfNewerOn( &$dbw, $revision ) {
1346                 wfProfileIn( __METHOD__ );
1347                 $row = $dbw->selectRow(
1348                         array( 'revision', 'page' ),
1349                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1350                         array(
1351                                 'page_id' => $this->getId(),
1352                                 'page_latest=rev_id' ),
1353                         __METHOD__ );
1354                 if( $row ) {
1355                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1356                                 wfProfileOut( __METHOD__ );
1357                                 return false;
1358                         }
1359                         $prev = $row->rev_id;
1360                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1361                 } else {
1362                         # No or missing previous revision; mark the page as new
1363                         $prev = 0;
1364                         $lastRevIsRedirect = null;
1365                 }
1366                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1367                 wfProfileOut( __METHOD__ );
1368                 return $ret;
1369         }
1370
1371         /**
1372          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1373          * @return string Complete article text, or null if error
1374          */
1375         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1376                 wfProfileIn( __METHOD__ );
1377                 if( strval( $section ) == '' ) {
1378                         // Whole-page edit; let the whole text through
1379                 } else {
1380                         if( is_null($edittime) ) {
1381                                 $rev = Revision::newFromTitle( $this->mTitle );
1382                         } else {
1383                                 $dbw = wfGetDB( DB_MASTER );
1384                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1385                         }
1386                         if( !$rev ) {
1387                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1388                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1389                                 return null;
1390                         }
1391                         $oldtext = $rev->getText();
1392
1393                         if( $section == 'new' ) {
1394                                 # Inserting a new section
1395                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1396                                 $text = strlen( trim( $oldtext ) ) > 0
1397                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1398                                                 : "{$subject}{$text}";
1399                         } else {
1400                                 # Replacing an existing section; roll out the big guns
1401                                 global $wgParser;
1402                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1403                         }
1404                 }
1405                 wfProfileOut( __METHOD__ );
1406                 return $text;
1407         }
1408
1409         /**
1410          * @deprecated use Article::doEdit()
1411          */
1412         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1413                 wfDeprecated( __METHOD__ );
1414                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1415                         ( $isminor ? EDIT_MINOR : 0 ) |
1416                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1417                         ( $bot ? EDIT_FORCE_BOT : 0 );
1418
1419                 # If this is a comment, add the summary as headline
1420                 if( $comment && $summary != "" ) {
1421                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1422                 }
1423
1424                 $this->doEdit( $text, $summary, $flags );
1425
1426                 $dbw = wfGetDB( DB_MASTER );
1427                 if($watchthis) {
1428                         if(!$this->mTitle->userIsWatching()) {
1429                                 $dbw->begin();
1430                                 $this->doWatch();
1431                                 $dbw->commit();
1432                         }
1433                 } else {
1434                         if( $this->mTitle->userIsWatching() ) {
1435                                 $dbw->begin();
1436                                 $this->doUnwatch();
1437                                 $dbw->commit();
1438                         }
1439                 }
1440                 $this->doRedirect( $this->isRedirect( $text ) );
1441         }
1442
1443         /**
1444          * @deprecated use Article::doEdit()
1445          */
1446         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1447                 wfDeprecated( __METHOD__ );
1448                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1449                         ( $minor ? EDIT_MINOR : 0 ) |
1450                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1451
1452                 $status = $this->doEdit( $text, $summary, $flags );
1453                 if( !$status->isOK() ) {
1454                         return false;
1455                 }
1456
1457                 $dbw = wfGetDB( DB_MASTER );
1458                 if( $watchthis ) {
1459                         if(!$this->mTitle->userIsWatching()) {
1460                                 $dbw->begin();
1461                                 $this->doWatch();
1462                                 $dbw->commit();
1463                         }
1464                 } else {
1465                         if( $this->mTitle->userIsWatching() ) {
1466                                 $dbw->begin();
1467                                 $this->doUnwatch();
1468                                 $dbw->commit();
1469                         }
1470                 }
1471
1472                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1473                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1474
1475                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1476                 return true;
1477         }
1478
1479         /**
1480          * Article::doEdit()
1481          *
1482          * Change an existing article or create a new article. Updates RC and all necessary caches,
1483          * optionally via the deferred update array.
1484          *
1485          * $wgUser must be set before calling this function.
1486          *
1487          * @param $text String: new text
1488          * @param $summary String: edit summary
1489          * @param $flags Integer bitfield:
1490          *      EDIT_NEW
1491          *          Article is known or assumed to be non-existent, create a new one
1492          *      EDIT_UPDATE
1493          *          Article is known or assumed to be pre-existing, update it
1494          *      EDIT_MINOR
1495          *          Mark this edit minor, if the user is allowed to do so
1496          *      EDIT_SUPPRESS_RC
1497          *          Do not log the change in recentchanges
1498          *      EDIT_FORCE_BOT
1499          *          Mark the edit a "bot" edit regardless of user rights
1500          *      EDIT_DEFER_UPDATES
1501          *          Defer some of the updates until the end of index.php
1502          *      EDIT_AUTOSUMMARY
1503          *          Fill in blank summaries with generated text where possible
1504          *
1505          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1506          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1507          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1508          * edit-already-exists error will be returned. These two conditions are also possible with
1509          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1510          *
1511          * @param $baseRevId the revision ID this edit was based off, if any
1512          * @param $user Optional user object, $wgUser will be used if not passed
1513          *
1514          * @return Status object. Possible errors:
1515          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1516          *     edit-gone-missing:       In update mode, but the article didn't exist
1517          *     edit-conflict:           In update mode, the article changed unexpectedly
1518          *     edit-no-change:          Warning that the text was the same as before
1519          *     edit-already-exists:     In creation mode, but the article already exists
1520          *
1521          *  Extensions may define additional errors.
1522          *
1523          *  $return->value will contain an associative array with members as follows:
1524          *     new:                     Boolean indicating if the function attempted to create a new article
1525          *     revision:                The revision object for the inserted revision, or null
1526          *
1527          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1528          */
1529         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1530                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1531
1532                 # Low-level sanity check
1533                 if( $this->mTitle->getText() == '' ) {
1534                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1535                 }
1536
1537                 wfProfileIn( __METHOD__ );
1538
1539                 $user = is_null($user) ? $wgUser : $user;
1540                 $status = Status::newGood( array() );
1541
1542                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1543                 $this->loadPageData();
1544
1545                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1546                         $aid = $this->mTitle->getArticleID();
1547                         if( $aid ) {
1548                                 $flags |= EDIT_UPDATE;
1549                         } else {
1550                                 $flags |= EDIT_NEW;
1551                         }
1552                 }
1553
1554                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1555                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1556                 {
1557                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1558                         wfProfileOut( __METHOD__ );
1559                         if( $status->isOK() ) {
1560                                 $status->fatal( 'edit-hook-aborted');
1561                         }
1562                         return $status;
1563                 }
1564
1565                 # Silently ignore EDIT_MINOR if not allowed
1566                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1567                 $bot = $flags & EDIT_FORCE_BOT;
1568
1569                 $oldtext = $this->getRawText(); // current revision
1570                 $oldsize = strlen( $oldtext );
1571
1572                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1573                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1574                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1575                 }
1576
1577                 $editInfo = $this->prepareTextForEdit( $text );
1578                 $text = $editInfo->pst;
1579                 $newsize = strlen( $text );
1580
1581                 $dbw = wfGetDB( DB_MASTER );
1582                 $now = wfTimestampNow();
1583
1584                 if( $flags & EDIT_UPDATE ) {
1585                         # Update article, but only if changed.
1586                         $status->value['new'] = false;
1587                         # Make sure the revision is either completely inserted or not inserted at all
1588                         if( !$wgDBtransactions ) {
1589                                 $userAbort = ignore_user_abort( true );
1590                         }
1591
1592                         $revisionId = 0;
1593
1594                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1595
1596                         if( $changed ) {
1597                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1598                                   - (int)$this->isCountable( $oldtext );
1599                                 $this->mTotalAdjustment = 0;
1600
1601                                 if( !$this->mLatest ) {
1602                                         # Article gone missing
1603                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1604                                         $status->fatal( 'edit-gone-missing' );
1605                                         wfProfileOut( __METHOD__ );
1606                                         return $status;
1607                                 }
1608
1609                                 $revision = new Revision( array(
1610                                         'page'       => $this->getId(),
1611                                         'comment'    => $summary,
1612                                         'minor_edit' => $isminor,
1613                                         'text'       => $text,
1614                                         'parent_id'  => $this->mLatest,
1615                                         'user'       => $user->getId(),
1616                                         'user_text'  => $user->getName(),
1617                                         ) );
1618
1619                                 $dbw->begin();
1620                                 $revisionId = $revision->insertOn( $dbw );
1621
1622                                 # Update page
1623                                 #
1624                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1625                                 # during the course of this function. This makes sure that EditPage can detect
1626                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1627                                 # before this function is called. A previous function used a separate query, this
1628                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1629                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1630
1631                                 if( !$ok ) {
1632                                         /* Belated edit conflict! Run away!! */
1633                                         $status->fatal( 'edit-conflict' );
1634                                         # Delete the invalid revision if the DB is not transactional
1635                                         if( !$wgDBtransactions ) {
1636                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1637                                         }
1638                                         $revisionId = 0;
1639                                         $dbw->rollback();
1640                                 } else {
1641                                         global $wgUseRCPatrol;
1642                                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, $baseRevId, $user) );
1643                                         # Update recentchanges
1644                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1645                                                 # Mark as patrolled if the user can do so
1646                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1647                                                 # Add RC row to the DB
1648                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1649                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1650                                                         $revisionId, $patrolled
1651                                                 );
1652                                                 # Log auto-patrolled edits
1653                                                 if( $patrolled ) {
1654                                                         PatrolLog::record( $rc, true );
1655                                                 }
1656                                         }
1657                                         $user->incEditCount();
1658                                         $dbw->commit();
1659                                 }
1660                         } else {
1661                                 $status->warning( 'edit-no-change' );
1662                                 $revision = null;
1663                                 // Keep the same revision ID, but do some updates on it
1664                                 $revisionId = $this->getRevIdFetched();
1665                                 // Update page_touched, this is usually implicit in the page update
1666                                 // Other cache updates are done in onArticleEdit()
1667                                 $this->mTitle->invalidateCache();
1668                         }
1669
1670                         if( !$wgDBtransactions ) {
1671                                 ignore_user_abort( $userAbort );
1672                         }
1673                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1674                         if( !$status->isOK() ) {
1675                                 wfProfileOut( __METHOD__ );
1676                                 return $status;
1677                         }
1678
1679                         # Invalidate cache of this article and all pages using this article
1680                         # as a template. Partly deferred.
1681                         Article::onArticleEdit( $this->mTitle );
1682                         # Update links tables, site stats, etc.
1683                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1684                 } else {
1685                         # Create new article
1686                         $status->value['new'] = true;
1687
1688                         # Set statistics members
1689                         # We work out if it's countable after PST to avoid counter drift
1690                         # when articles are created with {{subst:}}
1691                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1692                         $this->mTotalAdjustment = 1;
1693
1694                         $dbw->begin();
1695
1696                         # Add the page record; stake our claim on this title!
1697                         # This will return false if the article already exists
1698                         $newid = $this->insertOn( $dbw );
1699
1700                         if( $newid === false ) {
1701                                 $dbw->rollback();
1702                                 $status->fatal( 'edit-already-exists' );
1703                                 wfProfileOut( __METHOD__ );
1704                                 return $status;
1705                         }
1706
1707                         # Save the revision text...
1708                         $revision = new Revision( array(
1709                                 'page'       => $newid,
1710                                 'comment'    => $summary,
1711                                 'minor_edit' => $isminor,
1712                                 'text'       => $text,
1713                                 'user'       => $user->getId(),
1714                                 'user_text'  => $user->getName(),
1715                                 ) );
1716                         $revisionId = $revision->insertOn( $dbw );
1717
1718                         $this->mTitle->resetArticleID( $newid );
1719
1720                         # Update the page record with revision data
1721                         $this->updateRevisionOn( $dbw, $revision, 0 );
1722
1723                         wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $user) );
1724                         # Update recentchanges
1725                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1726                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1727                                 # Mark as patrolled if the user can do so
1728                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1729                                 # Add RC row to the DB
1730                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1731                                         '', strlen($text), $revisionId, $patrolled );
1732                                 # Log auto-patrolled edits
1733                                 if( $patrolled ) {
1734                                         PatrolLog::record( $rc, true );
1735                                 }
1736                         }
1737                         $user->incEditCount();
1738                         $dbw->commit();
1739
1740                         # Update links, etc.
1741                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1742
1743                         # Clear caches
1744                         Article::onArticleCreate( $this->mTitle );
1745
1746                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1747                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1748                 }
1749
1750                 # Do updates right now unless deferral was requested
1751                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1752                         wfDoUpdates();
1753                 }
1754
1755                 // Return the new revision (or null) to the caller
1756                 $status->value['revision'] = $revision;
1757
1758                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1759                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status ) );
1760
1761                 wfProfileOut( __METHOD__ );
1762                 return $status;
1763         }
1764
1765         /**
1766          * @deprecated wrapper for doRedirect
1767          */
1768         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1769                 wfDeprecated( __METHOD__ );
1770                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1771         }
1772
1773         /**
1774          * Output a redirect back to the article.
1775          * This is typically used after an edit.
1776          *
1777          * @param $noRedir Boolean: add redirect=no
1778          * @param $sectionAnchor String: section to redirect to, including "#"
1779          * @param $extraQuery String: extra query params
1780          */
1781         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1782                 global $wgOut;
1783                 if( $noRedir ) {
1784                         $query = 'redirect=no';
1785                         if( $extraQuery )
1786                                 $query .= "&$query";
1787                 } else {
1788                         $query = $extraQuery;
1789                 }
1790                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1791         }
1792
1793         /**
1794          * Mark this particular edit/page as patrolled
1795          */
1796         public function markpatrolled() {
1797                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1798                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1799
1800                 # If we haven't been given an rc_id value, we can't do anything
1801                 $rcid = (int) $wgRequest->getVal('rcid');
1802                 $rc = RecentChange::newFromId($rcid);
1803                 if( is_null($rc) ) {
1804                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1805                         return;
1806                 }
1807
1808                 #It would be nice to see where the user had actually come from, but for now just guess
1809                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1810                 $return = SpecialPage::getTitleFor( $returnto );
1811
1812                 $dbw = wfGetDB( DB_MASTER );
1813                 $errors = $rc->doMarkPatrolled();
1814
1815                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1816                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1817                         return;
1818                 }
1819
1820                 if( in_array(array('hookaborted'), $errors) ) {
1821                         // The hook itself has handled any output
1822                         return;
1823                 }
1824
1825                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1826                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1827                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1828                         $wgOut->returnToMain( false, $return );
1829                         return;
1830                 }
1831
1832                 if( !empty($errors) ) {
1833                         $wgOut->showPermissionsErrorPage( $errors );
1834                         return;
1835                 }
1836
1837                 # Inform the user
1838                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1839                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1840                 $wgOut->returnToMain( false, $return );
1841         }
1842
1843         /**
1844          * User-interface handler for the "watch" action
1845          */
1846
1847         public function watch() {
1848                 global $wgUser, $wgOut;
1849                 if( $wgUser->isAnon() ) {
1850                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1851                         return;
1852                 }
1853                 if( wfReadOnly() ) {
1854                         $wgOut->readOnlyPage();
1855                         return;
1856                 }
1857                 if( $this->doWatch() ) {
1858                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1859                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1860                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1861                 }
1862                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1863         }
1864
1865         /**
1866          * Add this page to $wgUser's watchlist
1867          * @return bool true on successful watch operation
1868          */
1869         public function doWatch() {
1870                 global $wgUser;
1871                 if( $wgUser->isAnon() ) {
1872                         return false;
1873                 }
1874                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1875                         $wgUser->addWatch( $this->mTitle );
1876                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1877                 }
1878                 return false;
1879         }
1880
1881         /**
1882          * User interface handler for the "unwatch" action.
1883          */
1884         public function unwatch() {
1885                 global $wgUser, $wgOut;
1886                 if( $wgUser->isAnon() ) {
1887                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1888                         return;
1889                 }
1890                 if( wfReadOnly() ) {
1891                         $wgOut->readOnlyPage();
1892                         return;
1893                 }
1894                 if( $this->doUnwatch() ) {
1895                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1896                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1897                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1898                 }
1899                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1900         }
1901
1902         /**
1903          * Stop watching a page
1904          * @return bool true on successful unwatch
1905          */
1906         public function doUnwatch() {
1907                 global $wgUser;
1908                 if( $wgUser->isAnon() ) {
1909                         return false;
1910                 }
1911                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1912                         $wgUser->removeWatch( $this->mTitle );
1913                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1914                 }
1915                 return false;
1916         }
1917
1918         /**
1919          * action=protect handler
1920          */
1921         public function protect() {
1922                 $form = new ProtectionForm( $this );
1923                 $form->execute();
1924         }
1925
1926         /**
1927          * action=unprotect handler (alias)
1928          */
1929         public function unprotect() {
1930                 $this->protect();
1931         }
1932
1933         /**
1934          * Update the article's restriction field, and leave a log entry.
1935          *
1936          * @param $limit Array: set of restriction keys
1937          * @param $reason String
1938          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1939          * @param $expiry Array: per restriction type expiration
1940          * @return bool true on success
1941          */
1942         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1943                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1944
1945                 $id = $this->mTitle->getArticleID();
1946                 if ( $id <= 0 ) {
1947                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
1948                         return false;
1949                 }
1950
1951                 if ( wfReadOnly() ) {
1952                         wfDebug( "updateRestrictions failed: read-only\n" );
1953                         return false;
1954                 }
1955
1956                 if ( wfReadOnly() ) {
1957                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1958                         return false;
1959                 }
1960
1961                 if( !$cascade ) {
1962                         $cascade = false;
1963                 }
1964
1965                 // Take this opportunity to purge out expired restrictions
1966                 Title::purgeExpiredRestrictions();
1967
1968                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1969                 # we expect a single selection, but the schema allows otherwise.
1970                 $current = array();
1971                 $updated = Article::flattenRestrictions( $limit );
1972                 $changed = false;
1973                 foreach( $wgRestrictionTypes as $action ) {
1974                         if( isset( $expiry[$action] ) ) {
1975                                 # Get current restrictions on $action
1976                                 $aLimits = $this->mTitle->getRestrictions( $action );
1977                                 $current[$action] = implode( '', $aLimits );
1978                                 # Are any actual restrictions being dealt with here?
1979                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
1980                                 # If something changed, we need to log it. Checking $aRChanged
1981                                 # assures that "unprotecting" a page that is not protected does
1982                                 # not log just because the expiry was "changed".
1983                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1984                                         $changed = true;
1985                                 }
1986                         }
1987                 }
1988
1989                 $current = Article::flattenRestrictions( $current );
1990
1991                 $changed = ($changed || $current != $updated );
1992                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
1993                 $protect = ( $updated != '' );
1994
1995                 # If nothing's changed, do nothing
1996                 if( $changed ) {
1997                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1998
1999                                 $dbw = wfGetDB( DB_MASTER );
2000
2001                                 # Prepare a null revision to be added to the history
2002                                 $modified = $current != '' && $protect;
2003                                 if( $protect ) {
2004                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2005                                 } else {
2006                                         $comment_type = 'unprotectedarticle';
2007                                 }
2008                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2009
2010                                 # Only restrictions with the 'protect' right can cascade...
2011                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2012                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2013                                 # The schema allows multiple restrictions
2014                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2015                                         $cascade = false;
2016                                 $cascade_description = '';
2017                                 if( $cascade ) {
2018                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2019                                 }
2020
2021                                 if( $reason )
2022                                         $comment .= ": $reason";
2023
2024                                 $editComment = $comment;
2025                                 $encodedExpiry = array();
2026                                 $protect_description = '';
2027                                 foreach( $limit as $action => $restrictions  ) {
2028                                         if ( !isset($expiry[$action]) )
2029                                                 $expiry[$action] = 'infinite';
2030
2031                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2032                                         if( $restrictions != '' ) {
2033                                                 $protect_description .= "[$action=$restrictions] (";
2034                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2035                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2036                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2037                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2038                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2039                                                 } else {
2040                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2041                                                 }
2042                                                 $protect_description .= ') ';
2043                                         }
2044                                 }
2045                                 $protect_description = trim($protect_description);
2046
2047                                 if( $protect_description && $protect )
2048                                         $editComment .= " ($protect_description)";
2049                                 if( $cascade )
2050                                         $editComment .= "$cascade_description";
2051                                 # Update restrictions table
2052                                 foreach( $limit as $action => $restrictions ) {
2053                                         if($restrictions != '' ) {
2054                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2055                                                         array( 'pr_page' => $id,
2056                                                                 'pr_type' => $action,
2057                                                                 'pr_level' => $restrictions,
2058                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2059                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2060                                         } else {
2061                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2062                                                         'pr_type' => $action ), __METHOD__ );
2063                                         }
2064                                 }
2065
2066                                 # Insert a null revision
2067                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2068                                 $nullRevId = $nullRevision->insertOn( $dbw );
2069
2070                                 $latest = $this->getLatest();
2071                                 # Update page record
2072                                 $dbw->update( 'page',
2073                                         array( /* SET */
2074                                                 'page_touched' => $dbw->timestamp(),
2075                                                 'page_restrictions' => '',
2076                                                 'page_latest' => $nullRevId
2077                                         ), array( /* WHERE */
2078                                                 'page_id' => $id
2079                                         ), 'Article::protect'
2080                                 );
2081
2082                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2083                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2084
2085                                 # Update the protection log
2086                                 $log = new LogPage( 'protect' );
2087                                 if( $protect ) {
2088                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2089                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2090                                 } else {
2091                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2092                                 }
2093
2094                         } # End hook
2095                 } # End "changed" check
2096
2097                 return true;
2098         }
2099
2100         /**
2101          * Take an array of page restrictions and flatten it to a string
2102          * suitable for insertion into the page_restrictions field.
2103          * @param $limit Array
2104          * @return String
2105          */
2106         protected static function flattenRestrictions( $limit ) {
2107                 if( !is_array( $limit ) ) {
2108                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2109                 }
2110                 $bits = array();
2111                 ksort( $limit );
2112                 foreach( $limit as $action => $restrictions ) {
2113                         if( $restrictions != '' ) {
2114                                 $bits[] = "$action=$restrictions";
2115                         }
2116                 }
2117                 return implode( ':', $bits );
2118         }
2119
2120         /**
2121          * Auto-generates a deletion reason
2122          * @param &$hasHistory Boolean: whether the page has a history
2123          */
2124         public function generateReason( &$hasHistory ) {
2125                 global $wgContLang;
2126                 $dbw = wfGetDB( DB_MASTER );
2127                 // Get the last revision
2128                 $rev = Revision::newFromTitle( $this->mTitle );
2129                 if( is_null( $rev ) )
2130                         return false;
2131
2132                 // Get the article's contents
2133                 $contents = $rev->getText();
2134                 $blank = false;
2135                 // If the page is blank, use the text from the previous revision,
2136                 // which can only be blank if there's a move/import/protect dummy revision involved
2137                 if( $contents == '' ) {
2138                         $prev = $rev->getPrevious();
2139                         if( $prev )     {
2140                                 $contents = $prev->getText();
2141                                 $blank = true;
2142                         }
2143                 }
2144
2145                 // Find out if there was only one contributor
2146                 // Only scan the last 20 revisions
2147                 $limit = 20;
2148                 $res = $dbw->select( 'revision', 'rev_user_text',
2149                         array( 'rev_page' => $this->getID() ), __METHOD__,
2150                         array( 'LIMIT' => $limit )
2151                 );
2152                 if( $res === false )
2153                         // This page has no revisions, which is very weird
2154                         return false;
2155                 if( $res->numRows() > 1 )
2156                                 $hasHistory = true;
2157                 else
2158                                 $hasHistory = false;
2159                 $row = $dbw->fetchObject( $res );
2160                 $onlyAuthor = $row->rev_user_text;
2161                 // Try to find a second contributor
2162                 foreach( $res as $row ) {
2163                         if( $row->rev_user_text != $onlyAuthor ) {
2164                                 $onlyAuthor = false;
2165                                 break;
2166                         }
2167                 }
2168                 $dbw->freeResult( $res );
2169
2170                 // Generate the summary with a '$1' placeholder
2171                 if( $blank ) {
2172                         // The current revision is blank and the one before is also
2173                         // blank. It's just not our lucky day
2174                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2175                 } else {
2176                         if( $onlyAuthor )
2177                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2178                         else
2179                                 $reason = wfMsgForContent( 'excontent', '$1' );
2180                 }
2181
2182                 if( $reason == '-' ) {
2183                         // Allow these UI messages to be blanked out cleanly
2184                         return '';
2185                 }
2186
2187                 // Replace newlines with spaces to prevent uglyness
2188                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2189                 // Calculate the maximum amount of chars to get
2190                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2191                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2192                 $contents = $wgContLang->truncate( $contents, $maxLength );
2193                 // Remove possible unfinished links
2194                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2195                 // Now replace the '$1' placeholder
2196                 $reason = str_replace( '$1', $contents, $reason );
2197                 return $reason;
2198         }
2199
2200
2201         /*
2202          * UI entry point for page deletion
2203          */
2204         public function delete() {
2205                 global $wgUser, $wgOut, $wgRequest;
2206
2207                 $confirm = $wgRequest->wasPosted() &&
2208                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2209
2210                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2211                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2212
2213                 $reason = $this->DeleteReasonList;
2214
2215                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2216                         // Entry from drop down menu + additional comment
2217                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2218                 } elseif( $reason == 'other' ) {
2219                         $reason = $this->DeleteReason;
2220                 }
2221                 # Flag to hide all contents of the archived revisions
2222                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2223
2224                 # This code desperately needs to be totally rewritten
2225
2226                 # Read-only check...
2227                 if( wfReadOnly() ) {
2228                         $wgOut->readOnlyPage();
2229                         return;
2230                 }
2231
2232                 # Check permissions
2233                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2234
2235                 if( count( $permission_errors ) > 0 ) {
2236                         $wgOut->showPermissionsErrorPage( $permission_errors );
2237                         return;
2238                 }
2239
2240                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2241
2242                 # Better double-check that it hasn't been deleted yet!
2243                 $dbw = wfGetDB( DB_MASTER );
2244                 $conds = $this->mTitle->pageCond();
2245                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2246                 if( $latest === false ) {
2247                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2248                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2249                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2250                         return;
2251                 }
2252
2253                 # Hack for big sites
2254                 $bigHistory = $this->isBigDeletion();
2255                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2256                         global $wgLang, $wgDeleteRevisionsLimit;
2257                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2258                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2259                         return;
2260                 }
2261
2262                 if( $confirm ) {
2263                         $this->doDelete( $reason, $suppress );
2264                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2265                                 $this->doWatch();
2266                         } elseif( $this->mTitle->userIsWatching() ) {
2267                                 $this->doUnwatch();
2268                         }
2269                         return;
2270                 }
2271
2272                 // Generate deletion reason
2273                 $hasHistory = false;
2274                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2275
2276                 // If the page has a history, insert a warning
2277                 if( $hasHistory && !$confirm ) {
2278                         $skin = $wgUser->getSkin();
2279                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2280                         if( $bigHistory ) {
2281                                 global $wgLang, $wgDeleteRevisionsLimit;
2282                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2283                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2284                         }
2285                 }
2286
2287                 return $this->confirmDelete( $reason );
2288         }
2289
2290         /**
2291          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2292          */
2293         public function isBigDeletion() {
2294                 global $wgDeleteRevisionsLimit;
2295                 if( $wgDeleteRevisionsLimit ) {
2296                         $revCount = $this->estimateRevisionCount();
2297                         return $revCount > $wgDeleteRevisionsLimit;
2298                 }
2299                 return false;
2300         }
2301
2302         /**
2303          * @return int approximate revision count
2304          */
2305         public function estimateRevisionCount() {
2306                 $dbr = wfGetDB( DB_SLAVE );
2307                 // For an exact count...
2308                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2309                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2310                 return $dbr->estimateRowCount( 'revision', '*',
2311                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2312         }
2313
2314         /**
2315          * Get the last N authors
2316          * @param $num Integer: number of revisions to get
2317          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2318          * @return array Array of authors, duplicates not removed
2319          */
2320         public function getLastNAuthors( $num, $revLatest = 0 ) {
2321                 wfProfileIn( __METHOD__ );
2322                 // First try the slave
2323                 // If that doesn't have the latest revision, try the master
2324                 $continue = 2;
2325                 $db = wfGetDB( DB_SLAVE );
2326                 do {
2327                         $res = $db->select( array( 'page', 'revision' ),
2328                                 array( 'rev_id', 'rev_user_text' ),
2329                                 array(
2330                                         'page_namespace' => $this->mTitle->getNamespace(),
2331                                         'page_title' => $this->mTitle->getDBkey(),
2332                                         'rev_page = page_id'
2333                                 ), __METHOD__, $this->getSelectOptions( array(
2334                                         'ORDER BY' => 'rev_timestamp DESC',
2335                                         'LIMIT' => $num
2336                                 ) )
2337                         );
2338                         if( !$res ) {
2339                                 wfProfileOut( __METHOD__ );
2340                                 return array();
2341                         }
2342                         $row = $db->fetchObject( $res );
2343                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2344                                 $db = wfGetDB( DB_MASTER );
2345                                 $continue--;
2346                         } else {
2347                                 $continue = 0;
2348                         }
2349                 } while ( $continue );
2350
2351                 $authors = array( $row->rev_user_text );
2352                 while ( $row = $db->fetchObject( $res ) ) {
2353                         $authors[] = $row->rev_user_text;
2354                 }
2355                 wfProfileOut( __METHOD__ );
2356                 return $authors;
2357         }
2358
2359         /**
2360          * Output deletion confirmation dialog
2361          * @param $reason String: prefilled reason
2362          */
2363         public function confirmDelete( $reason ) {
2364                 global $wgOut, $wgUser;
2365
2366                 wfDebug( "Article::confirmDelete\n" );
2367
2368                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2369                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2370                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2371
2372                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2373                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2374                                         <td></td>
2375                                         <td class='mw-input'>" .
2376                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2377                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2378                                         "</td>
2379                                 </tr>";
2380                 } else {
2381                         $suppress = '';
2382                 }
2383                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2384
2385                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2386                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2387                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2388                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2389                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2390                         "<tr id=\"wpDeleteReasonListRow\">
2391                                 <td class='mw-label'>" .
2392                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2393                                 "</td>
2394                                 <td class='mw-input'>" .
2395                                         Xml::listDropDown( 'wpDeleteReasonList',
2396                                                 wfMsgForContent( 'deletereason-dropdown' ),
2397                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2398                                 "</td>
2399                         </tr>
2400                         <tr id=\"wpDeleteReasonRow\">
2401                                 <td class='mw-label'>" .
2402                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2403                                 "</td>
2404                                 <td class='mw-input'>" .
2405                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2406                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2407                                 "</td>
2408                         </tr>
2409                         <tr>
2410                                 <td></td>
2411                                 <td class='mw-input'>" .
2412                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2413                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2414                                 "</td>
2415                         </tr>
2416                         $suppress
2417                         <tr>
2418                                 <td></td>
2419                                 <td class='mw-submit'>" .
2420                                         Xml::submitButton( wfMsg( 'deletepage' ),
2421                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2422                                 "</td>
2423                         </tr>" .
2424                         Xml::closeElement( 'table' ) .
2425                         Xml::closeElement( 'fieldset' ) .
2426                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2427                         Xml::closeElement( 'form' );
2428
2429                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2430                                 $skin = $wgUser->getSkin();
2431                                 $link = $skin->makeLink ( 'MediaWiki:Deletereason-dropdown', wfMsgHtml( 'delete-edit-reasonlist' ) );
2432                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2433                         }
2434
2435                 $wgOut->addHTML( $form );
2436                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2437         }
2438
2439         /**
2440          * Perform a deletion and output success or failure messages
2441          */
2442         public function doDelete( $reason, $suppress = false ) {
2443                 global $wgOut, $wgUser;
2444                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2445
2446                 $error = '';
2447                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2448                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2449                                 $deleted = $this->mTitle->getPrefixedText();
2450
2451                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2452                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2453
2454                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2455
2456                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2457                                 $wgOut->returnToMain( false );
2458                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2459                         } else {
2460                                 if( $error == '' ) {
2461                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2462                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2463                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2464                                 } else {
2465                                         $wgOut->showFatalError( $error );
2466                                 }
2467                         }
2468                 }
2469         }
2470
2471         /**
2472          * Back-end article deletion
2473          * Deletes the article with database consistency, writes logs, purges caches
2474          * Returns success
2475          */
2476         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2477                 global $wgUseSquid, $wgDeferredUpdateList;
2478                 global $wgUseTrackbacks;
2479
2480                 wfDebug( __METHOD__."\n" );
2481
2482                 $dbw = wfGetDB( DB_MASTER );
2483                 $ns = $this->mTitle->getNamespace();
2484                 $t = $this->mTitle->getDBkey();
2485                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2486
2487                 if( $t == '' || $id == 0 ) {
2488                         return false;
2489                 }
2490
2491                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2492                 array_push( $wgDeferredUpdateList, $u );
2493
2494                 // Bitfields to further suppress the content
2495                 if( $suppress ) {
2496                         $bitfield = 0;
2497                         // This should be 15...
2498                         $bitfield |= Revision::DELETED_TEXT;
2499                         $bitfield |= Revision::DELETED_COMMENT;
2500                         $bitfield |= Revision::DELETED_USER;
2501                         $bitfield |= Revision::DELETED_RESTRICTED;
2502                 } else {
2503                         $bitfield = 'rev_deleted';
2504                 }
2505
2506                 $dbw->begin();
2507                 // For now, shunt the revision data into the archive table.
2508                 // Text is *not* removed from the text table; bulk storage
2509                 // is left intact to avoid breaking block-compression or
2510                 // immutable storage schemes.
2511                 //
2512                 // For backwards compatibility, note that some older archive
2513                 // table entries will have ar_text and ar_flags fields still.
2514                 //
2515                 // In the future, we may keep revisions and mark them with
2516                 // the rev_deleted field, which is reserved for this purpose.
2517                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2518                         array(
2519                                 'ar_namespace'  => 'page_namespace',
2520                                 'ar_title'      => 'page_title',
2521                                 'ar_comment'    => 'rev_comment',
2522                                 'ar_user'       => 'rev_user',
2523                                 'ar_user_text'  => 'rev_user_text',
2524                                 'ar_timestamp'  => 'rev_timestamp',
2525                                 'ar_minor_edit' => 'rev_minor_edit',
2526                                 'ar_rev_id'     => 'rev_id',
2527                                 'ar_text_id'    => 'rev_text_id',
2528                                 'ar_text'       => '\'\'', // Be explicit to appease
2529                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2530                                 'ar_len'        => 'rev_len',
2531                                 'ar_page_id'    => 'page_id',
2532                                 'ar_deleted'    => $bitfield
2533                         ), array(
2534                                 'page_id' => $id,
2535                                 'page_id = rev_page'
2536                         ), __METHOD__
2537                 );
2538
2539                 # Delete restrictions for it
2540                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2541
2542                 # Now that it's safely backed up, delete it
2543                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2544                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2545                 if( !$ok ) {
2546                         $dbw->rollback();
2547                         return false;
2548                 }
2549
2550                 # Fix category table counts
2551                 $cats = array();
2552                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2553                 foreach( $res as $row ) {
2554                         $cats []= $row->cl_to;
2555                 }
2556                 $this->updateCategoryCounts( array(), $cats );
2557
2558                 # If using cascading deletes, we can skip some explicit deletes
2559                 if( !$dbw->cascadingDeletes() ) {
2560                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2561
2562                         if($wgUseTrackbacks)
2563                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2564
2565                         # Delete outgoing links
2566                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2567                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2568                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2569                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2570                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2571                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2572                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2573                 }
2574
2575                 # If using cleanup triggers, we can skip some manual deletes
2576                 if( !$dbw->cleanupTriggers() ) {
2577                         # Clean up recentchanges entries...
2578                         $dbw->delete( 'recentchanges',
2579                                 array( 'rc_type != '.RC_LOG,
2580                                         'rc_namespace' => $this->mTitle->getNamespace(),
2581                                         'rc_title' => $this->mTitle->getDBKey() ),
2582                                 __METHOD__ );
2583                         $dbw->delete( 'recentchanges',
2584                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2585                                 __METHOD__ );
2586                 }
2587
2588                 # Clear caches
2589                 Article::onArticleDelete( $this->mTitle );
2590
2591                 # Clear the cached article id so the interface doesn't act like we exist
2592                 $this->mTitle->resetArticleID( 0 );
2593
2594                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2595                 $logtype = $suppress ? 'suppress' : 'delete';
2596                 $log = new LogPage( $logtype );
2597
2598                 # Make sure logging got through
2599                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2600
2601                 $dbw->commit();
2602
2603                 return true;
2604         }
2605
2606         /**
2607          * Roll back the most recent consecutive set of edits to a page
2608          * from the same user; fails if there are no eligible edits to
2609          * roll back to, e.g. user is the sole contributor. This function
2610          * performs permissions checks on $wgUser, then calls commitRollback()
2611          * to do the dirty work
2612          *
2613          * @param $fromP String: Name of the user whose edits to rollback.
2614          * @param $summary String: Custom summary. Set to default summary if empty.
2615          * @param $token String: Rollback token.
2616          * @param $bot Boolean: If true, mark all reverted edits as bot.
2617          *
2618          * @param $resultDetails Array: contains result-specific array of additional values
2619          *    'alreadyrolled' : 'current' (rev)
2620          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2621          *
2622          * @return array of errors, each error formatted as
2623          *   array(messagekey, param1, param2, ...).
2624          * On success, the array is empty.  This array can also be passed to
2625          * OutputPage::showPermissionsErrorPage().
2626          */
2627         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2628                 global $wgUser;
2629                 $resultDetails = null;
2630
2631                 # Check permissions
2632                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2633                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2634                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2635
2636                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2637                         $errors[] = array( 'sessionfailure' );
2638
2639                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2640                         $errors[] = array( 'actionthrottledtext' );
2641                 }
2642                 # If there were errors, bail out now
2643                 if( !empty( $errors ) )
2644                         return $errors;
2645
2646                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2647         }
2648
2649         /**
2650          * Backend implementation of doRollback(), please refer there for parameter
2651          * and return value documentation
2652          *
2653          * NOTE: This function does NOT check ANY permissions, it just commits the
2654          * rollback to the DB Therefore, you should only call this function direct-
2655          * ly if you want to use custom permissions checks. If you don't, use
2656          * doRollback() instead.
2657          */
2658         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2659                 global $wgUseRCPatrol, $wgUser, $wgLang;
2660                 $dbw = wfGetDB( DB_MASTER );
2661
2662                 if( wfReadOnly() ) {
2663                         return array( array( 'readonlytext' ) );
2664                 }
2665
2666                 # Get the last editor
2667                 $current = Revision::newFromTitle( $this->mTitle );
2668                 if( is_null( $current ) ) {
2669                         # Something wrong... no page?
2670                         return array(array('notanarticle'));
2671                 }
2672
2673                 $from = str_replace( '_', ' ', $fromP );
2674                 if( $from != $current->getUserText() ) {
2675                         $resultDetails = array( 'current' => $current );
2676                         return array(array('alreadyrolled',
2677                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2678                                 htmlspecialchars($fromP),
2679                                 htmlspecialchars($current->getUserText())
2680                         ));
2681                 }
2682
2683                 # Get the last edit not by this guy
2684                 $user = intval( $current->getUser() );
2685                 $user_text = $dbw->addQuotes( $current->getUserText() );
2686                 $s = $dbw->selectRow( 'revision',
2687                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2688                         array(  'rev_page' => $current->getPage(),
2689                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2690                         ), __METHOD__,
2691                         array(  'USE INDEX' => 'page_timestamp',
2692                                 'ORDER BY'  => 'rev_timestamp DESC' )
2693                         );
2694                 if( $s === false ) {
2695                         # No one else ever edited this page
2696                         return array(array('cantrollback'));
2697                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2698                         # Only admins can see this text
2699                         return array(array('notvisiblerev'));
2700                 }
2701
2702                 $set = array();
2703                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2704                         # Mark all reverted edits as bot
2705                         $set['rc_bot'] = 1;
2706                 }
2707                 if( $wgUseRCPatrol ) {
2708                         # Mark all reverted edits as patrolled
2709                         $set['rc_patrolled'] = 1;
2710                 }
2711
2712                 if( $set ) {
2713                         $dbw->update( 'recentchanges', $set,
2714                                         array( /* WHERE */
2715                                                 'rc_cur_id' => $current->getPage(),
2716                                                 'rc_user_text' => $current->getUserText(),
2717                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2718                                         ), __METHOD__
2719                                 );
2720                 }
2721
2722                 # Generate the edit summary if necessary
2723                 $target = Revision::newFromId( $s->rev_id );
2724                 if( empty( $summary ) ){
2725                         $summary = wfMsgForContent( 'revertpage' );
2726                 }
2727
2728                 # Allow the custom summary to use the same args as the default message
2729                 $args = array(
2730                         $target->getUserText(), $from, $s->rev_id,
2731                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2732                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2733                 );
2734                 $summary = wfMsgReplaceArgs( $summary, $args );
2735
2736                 # Save
2737                 $flags = EDIT_UPDATE;
2738
2739                 if( $wgUser->isAllowed('minoredit') )
2740                         $flags |= EDIT_MINOR;
2741
2742                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2743                         $flags |= EDIT_FORCE_BOT;
2744                 # Actually store the edit
2745                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2746                 if( !empty( $status->value['revision'] ) ) {
2747                         $revId = $status->value['revision']->getId();
2748                 } else {
2749                         $revId = false;
2750                 }
2751
2752                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2753
2754                 $resultDetails = array(
2755                         'summary' => $summary,
2756                         'current' => $current,
2757                         'target' => $target,
2758                         'newid' => $revId
2759                 );
2760                 return array();
2761         }
2762
2763         /**
2764          * User interface for rollback operations
2765          */
2766         public function rollback() {
2767                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2768                 $details = null;
2769
2770                 $result = $this->doRollback(
2771                         $wgRequest->getVal( 'from' ),
2772                         $wgRequest->getText( 'summary' ),
2773                         $wgRequest->getVal( 'token' ),
2774                         $wgRequest->getBool( 'bot' ),
2775                         $details
2776                 );
2777
2778                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2779                         $wgOut->rateLimited();
2780                         return;
2781                 }
2782                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2783                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2784                         $errArray = $result[0];
2785                         $errMsg = array_shift( $errArray );
2786                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2787                         if( isset( $details['current'] ) ){
2788                                 $current = $details['current'];
2789                                 if( $current->getComment() != '' ) {
2790                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2791                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2792                                 }
2793                         }
2794                         return;
2795                 }
2796                 # Display permissions errors before read-only message -- there's no
2797                 # point in misleading the user into thinking the inability to rollback
2798                 # is only temporary.
2799                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2800                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2801                         # move any 'readonlytext' error manually.
2802                         $out = array();
2803                         foreach( $result as $error ) {
2804                                 if( $error != array( 'readonlytext' ) ) {
2805                                         $out []= $error;
2806                                 }
2807                         }
2808                         $wgOut->showPermissionsErrorPage( $out );
2809                         return;
2810                 }
2811                 if( $result == array( array( 'readonlytext' ) ) ) {
2812                         $wgOut->readOnlyPage();
2813                         return;
2814                 }
2815
2816                 $current = $details['current'];
2817                 $target = $details['target'];
2818                 $newId = $details['newid'];
2819                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2820                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2821                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2822                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2823                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2824                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2825                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2826                 $wgOut->returnToMain( false, $this->mTitle );
2827
2828                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2829                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2830                         $de->showDiff( '', '' );
2831                 }
2832         }
2833
2834
2835         /**
2836          * Do standard deferred updates after page view
2837          */
2838         public function viewUpdates() {
2839                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2840                 # Don't update page view counters on views from bot users (bug 14044)
2841                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2842                         Article::incViewCount( $this->getID() );
2843                         $u = new SiteStatsUpdate( 1, 0, 0 );
2844                         array_push( $wgDeferredUpdateList, $u );
2845                 }
2846                 # Update newtalk / watchlist notification status
2847                 $wgUser->clearNotification( $this->mTitle );
2848         }
2849
2850         /**
2851          * Prepare text which is about to be saved.
2852          * Returns a stdclass with source, pst and output members
2853          */
2854         public function prepareTextForEdit( $text, $revid=null ) {
2855                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2856                         // Already prepared
2857                         return $this->mPreparedEdit;
2858                 }
2859                 global $wgParser;
2860                 $edit = (object)array();
2861                 $edit->revid = $revid;
2862                 $edit->newText = $text;
2863                 $edit->pst = $this->preSaveTransform( $text );
2864                 $options = new ParserOptions;
2865                 $options->setTidy( true );
2866                 $options->enableLimitReport();
2867                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2868                 $edit->oldText = $this->getContent();
2869                 $this->mPreparedEdit = $edit;
2870                 return $edit;
2871         }
2872
2873         /**
2874          * Do standard deferred updates after page edit.
2875          * Update links tables, site stats, search index and message cache.
2876          * Purges pages that include this page if the text was changed here.
2877          * Every 100th edit, prune the recent changes table.
2878          *
2879          * @private
2880          * @param $text New text of the article
2881          * @param $summary Edit summary
2882          * @param $minoredit Minor edit
2883          * @param $timestamp_of_pagechange Timestamp associated with the page change
2884          * @param $newid rev_id value of the new revision
2885          * @param $changed Whether or not the content actually changed
2886          */
2887         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2888                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2889
2890                 wfProfileIn( __METHOD__ );
2891
2892                 # Parse the text
2893                 # Be careful not to double-PST: $text is usually already PST-ed once
2894                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2895                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2896                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2897                 } else {
2898                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2899                         $editInfo = $this->mPreparedEdit;
2900                 }
2901
2902                 # Save it to the parser cache
2903                 if( $wgEnableParserCache ) {
2904                         $parserCache = ParserCache::singleton();
2905                         $parserCache->save( $editInfo->output, $this, $wgUser );
2906                 }
2907
2908                 # Update the links tables
2909                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2910                 $u->doUpdate();
2911
2912                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2913
2914                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2915                         if( 0 == mt_rand( 0, 99 ) ) {
2916                                 // Flush old entries from the `recentchanges` table; we do this on
2917                                 // random requests so as to avoid an increase in writes for no good reason
2918                                 global $wgRCMaxAge;
2919                                 $dbw = wfGetDB( DB_MASTER );
2920                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2921                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2922                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2923                                 $dbw->query( $sql );
2924                         }
2925                 }
2926
2927                 $id = $this->getID();
2928                 $title = $this->mTitle->getPrefixedDBkey();
2929                 $shortTitle = $this->mTitle->getDBkey();
2930
2931                 if( 0 == $id ) {
2932                         wfProfileOut( __METHOD__ );
2933                         return;
2934                 }
2935
2936                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2937                 array_push( $wgDeferredUpdateList, $u );
2938                 $u = new SearchUpdate( $id, $title, $text );
2939                 array_push( $wgDeferredUpdateList, $u );
2940
2941                 # If this is another user's talk page, update newtalk
2942                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2943                 # load of user talk pages and piss people off, nor if it's a minor edit
2944                 # by a properly-flagged bot.
2945                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2946                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2947                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2948                                 $other = User::newFromName( $shortTitle, false );
2949                                 if( !$other ) {
2950                                         wfDebug( __METHOD__.": invalid username\n" );
2951                                 } elseif( User::isIP( $shortTitle ) ) {
2952                                         // An anonymous user
2953                                         $other->setNewtalk( true );
2954                                 } elseif( $other->isLoggedIn() ) {
2955                                         $other->setNewtalk( true );
2956                                 } else {
2957                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
2958                                 }
2959                         }
2960                 }
2961
2962                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2963                         $wgMessageCache->replace( $shortTitle, $text );
2964                 }
2965
2966                 wfProfileOut( __METHOD__ );
2967         }
2968
2969         /**
2970          * Perform article updates on a special page creation.
2971          *
2972          * @param $rev Revision object
2973          *
2974          * @todo This is a shitty interface function. Kill it and replace the
2975          * other shitty functions like editUpdates and such so it's not needed
2976          * anymore.
2977          */
2978         public function createUpdates( $rev ) {
2979                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2980                 $this->mTotalAdjustment = 1;
2981                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2982                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2983         }
2984
2985         /**
2986          * Generate the navigation links when browsing through an article revisions
2987          * It shows the information as:
2988          *   Revision as of \<date\>; view current revision
2989          *   \<- Previous version | Next Version -\>
2990          *
2991          * @param $oldid String: revision ID of this article revision
2992          */
2993         public function setOldSubtitle( $oldid = 0 ) {
2994                 global $wgLang, $wgOut, $wgUser, $wgRequest;
2995
2996                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
2997                         return;
2998                 }
2999
3000                 $revision = Revision::newFromId( $oldid );
3001
3002                 $current = ( $oldid == $this->mLatest );
3003                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3004                 $sk = $wgUser->getSkin();
3005                 $lnk = $current
3006                         ? wfMsgHtml( 'currentrevisionlink' )
3007                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3008                 $curdiff = $current
3009                         ? wfMsgHtml( 'diff' )
3010                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3011                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3012                 $prevlink = $prev
3013                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3014                         : wfMsgHtml( 'previousrevision' );
3015                 $prevdiff = $prev
3016                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3017                         : wfMsgHtml( 'diff' );
3018                 $nextlink = $current
3019                         ? wfMsgHtml( 'nextrevision' )
3020                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3021                 $nextdiff = $current
3022                         ? wfMsgHtml( 'diff' )
3023                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3024
3025                 $cdel='';
3026                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3027                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3028                         if( $revision->isCurrent() ) {
3029                         // We don't handle top deleted edits too well
3030                                 $cdel = wfMsgHtml( 'rev-delundel' );
3031                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3032                         // If revision was hidden from sysops
3033                                 $cdel = wfMsgHtml( 'rev-delundel' );
3034                         } else {
3035                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3036                                         wfMsgHtml('rev-delundel'),
3037                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3038                                         '&oldid=' . urlencode( $oldid ) );
3039                                 // Bolden oversighted content
3040                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3041                                         $cdel = "<strong>$cdel</strong>";
3042                         }
3043                         $cdel = "(<small>$cdel</small>) ";
3044                 }
3045                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3046                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3047                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3048
3049                 $m = wfMsg( 'revision-info-current' );
3050                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3051                         ? 'revision-info-current'
3052                         : 'revision-info';
3053
3054                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3055                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3056
3057                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3058                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3059                 $wgOut->setSubtitle( $r );
3060         }
3061
3062         /**
3063          * This function is called right before saving the wikitext,
3064          * so we can do things like signatures and links-in-context.
3065          *
3066          * @param $text String
3067          */
3068         public function preSaveTransform( $text ) {
3069                 global $wgParser, $wgUser;
3070                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3071         }
3072
3073         /* Caching functions */
3074
3075         /**
3076          * checkLastModified returns true if it has taken care of all
3077          * output to the client that is necessary for this request.
3078          * (that is, it has sent a cached version of the page)
3079          */
3080         protected function tryFileCache() {
3081                 static $called = false;
3082                 if( $called ) {
3083                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3084                         return false;
3085                 }
3086                 $called = true;
3087                 if( $this->isFileCacheable() ) {
3088                         $cache = new HTMLFileCache( $this->mTitle );
3089                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3090                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3091                                 $cache->loadFromFileCache();
3092                                 return true;
3093                         } else {
3094                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3095                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3096                         }
3097                 } else {
3098                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3099                 }
3100                 return false;
3101         }
3102
3103         /**
3104          * Check if the page can be cached
3105          * @return bool
3106          */
3107         public function isFileCacheable() {
3108                 $cacheable = false;
3109                 if( HTMLFileCache::useFileCache() ) {
3110                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3111                         // Extension may have reason to disable file caching on some pages.
3112                         if( $cacheable ) {
3113                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3114                         }
3115                 }
3116                 return $cacheable;
3117         }
3118
3119         /**
3120          * Loads page_touched and returns a value indicating if it should be used
3121          *
3122          */
3123         public function checkTouched() {
3124                 if( !$this->mDataLoaded ) {
3125                         $this->loadPageData();
3126                 }
3127                 return !$this->mIsRedirect;
3128         }
3129
3130         /**
3131          * Get the page_touched field
3132          */
3133         public function getTouched() {
3134                 # Ensure that page data has been loaded
3135                 if( !$this->mDataLoaded ) {
3136                         $this->loadPageData();
3137                 }
3138                 return $this->mTouched;
3139         }
3140
3141         /**
3142          * Get the page_latest field
3143          */
3144         public function getLatest() {
3145                 if( !$this->mDataLoaded ) {
3146                         $this->loadPageData();
3147                 }
3148                 return $this->mLatest;
3149         }
3150
3151         /**
3152          * Edit an article without doing all that other stuff
3153          * The article must already exist; link tables etc
3154          * are not updated, caches are not flushed.
3155          *
3156          * @param $text String: text submitted
3157          * @param $comment String: comment submitted
3158          * @param $minor Boolean: whereas it's a minor modification
3159          */
3160         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3161                 wfProfileIn( __METHOD__ );
3162
3163                 $dbw = wfGetDB( DB_MASTER );
3164                 $revision = new Revision( array(
3165                         'page'       => $this->getId(),
3166                         'text'       => $text,
3167                         'comment'    => $comment,
3168                         'minor_edit' => $minor ? 1 : 0,
3169                         ) );
3170                 $revision->insertOn( $dbw );
3171                 $this->updateRevisionOn( $dbw, $revision );
3172
3173                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3174
3175                 wfProfileOut( __METHOD__ );
3176         }
3177
3178         /**
3179          * Used to increment the view counter
3180          *
3181          * @param $id Integer: article id
3182          */
3183         public static function incViewCount( $id ) {
3184                 $id = intval( $id );
3185                 global $wgHitcounterUpdateFreq, $wgDBtype;
3186
3187                 $dbw = wfGetDB( DB_MASTER );
3188                 $pageTable = $dbw->tableName( 'page' );
3189                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3190                 $acchitsTable = $dbw->tableName( 'acchits' );
3191
3192                 if( $wgHitcounterUpdateFreq <= 1 ) {
3193                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3194                         return;
3195                 }
3196
3197                 # Not important enough to warrant an error page in case of failure
3198                 $oldignore = $dbw->ignoreErrors( true );
3199
3200                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3201
3202                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3203                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3204                         # Most of the time (or on SQL errors), skip row count check
3205                         $dbw->ignoreErrors( $oldignore );
3206                         return;
3207                 }
3208
3209                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3210                 $row = $dbw->fetchObject( $res );
3211                 $rown = intval( $row->n );
3212                 if( $rown >= $wgHitcounterUpdateFreq ){
3213                         wfProfileIn( 'Article::incViewCount-collect' );
3214                         $old_user_abort = ignore_user_abort( true );
3215
3216                         if($wgDBtype == 'mysql')
3217                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3218                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3219                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3220                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3221                                 'GROUP BY hc_id');
3222                         $dbw->query("DELETE FROM $hitcounterTable");
3223                         if($wgDBtype == 'mysql') {
3224                                 $dbw->query('UNLOCK TABLES');
3225                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3226                                         'WHERE page_id = hc_id');
3227                         }
3228                         else {
3229                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3230                                         "FROM $acchitsTable WHERE page_id = hc_id");
3231                         }
3232                         $dbw->query("DROP TABLE $acchitsTable");
3233
3234                         ignore_user_abort( $old_user_abort );
3235                         wfProfileOut( 'Article::incViewCount-collect' );
3236                 }
3237                 $dbw->ignoreErrors( $oldignore );
3238         }
3239
3240         /**#@+
3241          * The onArticle*() functions are supposed to be a kind of hooks
3242          * which should be called whenever any of the specified actions
3243          * are done.
3244          *
3245          * This is a good place to put code to clear caches, for instance.
3246          *
3247          * This is called on page move and undelete, as well as edit
3248          *
3249          * @param $title a title object
3250          */
3251
3252         public static function onArticleCreate( $title ) {
3253                 # Update existence markers on article/talk tabs...
3254                 if( $title->isTalkPage() ) {
3255                         $other = $title->getSubjectPage();
3256                 } else {
3257                         $other = $title->getTalkPage();
3258                 }
3259                 $other->invalidateCache();
3260                 $other->purgeSquid();
3261
3262                 $title->touchLinks();
3263                 $title->purgeSquid();
3264                 $title->deleteTitleProtection();
3265         }
3266
3267         public static function onArticleDelete( $title ) {
3268                 global $wgMessageCache;
3269                 # Update existence markers on article/talk tabs...
3270                 if( $title->isTalkPage() ) {
3271                         $other = $title->getSubjectPage();
3272                 } else {
3273                         $other = $title->getTalkPage();
3274                 }
3275                 $other->invalidateCache();
3276                 $other->purgeSquid();
3277
3278                 $title->touchLinks();
3279                 $title->purgeSquid();
3280
3281                 # File cache
3282                 HTMLFileCache::clearFileCache( $title );
3283
3284                 # Messages
3285                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3286                         $wgMessageCache->replace( $title->getDBkey(), false );
3287                 }
3288                 # Images
3289                 if( $title->getNamespace() == NS_FILE ) {
3290                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3291                         $update->doUpdate();
3292                 }
3293                 # User talk pages
3294                 if( $title->getNamespace() == NS_USER_TALK ) {
3295                         $user = User::newFromName( $title->getText(), false );
3296                         $user->setNewtalk( false );
3297                 }
3298         }
3299
3300         /**
3301          * Purge caches on page update etc
3302          */
3303         public static function onArticleEdit( $title, $flags = '' ) {
3304                 global $wgDeferredUpdateList;
3305
3306                 // Invalidate caches of articles which include this page
3307                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3308
3309                 // Invalidate the caches of all pages which redirect here
3310                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3311
3312                 # Purge squid for this page only
3313                 $title->purgeSquid();
3314
3315                 # Clear file cache for this page only
3316                 HTMLFileCache::clearFileCache( $title );
3317         }
3318
3319         /**#@-*/
3320
3321         /**
3322          * Overriden by ImagePage class, only present here to avoid a fatal error
3323          * Called for ?action=revert
3324          */
3325         public function revert() {
3326                 global $wgOut;
3327                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3328         }
3329
3330         /**
3331          * Info about this page
3332          * Called for ?action=info when $wgAllowPageInfo is on.
3333          */
3334         public function info() {
3335                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3336
3337                 if( !$wgAllowPageInfo ) {
3338                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3339                         return;
3340                 }
3341
3342                 $page = $this->mTitle->getSubjectPage();
3343
3344                 $wgOut->setPagetitle( $page->getPrefixedText() );
3345                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3346                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3347
3348                 if( !$this->mTitle->exists() ) {
3349                         $wgOut->addHTML( '<div class="noarticletext">' );
3350                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3351                                 // This doesn't quite make sense; the user is asking for
3352                                 // information about the _page_, not the message... -- RC
3353                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3354                         } else {
3355                                 $msg = $wgUser->isLoggedIn()
3356                                         ? 'noarticletext'
3357                                         : 'noarticletextanon';
3358                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3359                         }
3360                         $wgOut->addHTML( '</div>' );
3361                 } else {
3362                         $dbr = wfGetDB( DB_SLAVE );
3363                         $wl_clause = array(
3364                                 'wl_title'     => $page->getDBkey(),
3365                                 'wl_namespace' => $page->getNamespace() );
3366                         $numwatchers = $dbr->selectField(
3367                                 'watchlist',
3368                                 'COUNT(*)',
3369                                 $wl_clause,
3370                                 __METHOD__,
3371                                 $this->getSelectOptions() );
3372
3373                         $pageInfo = $this->pageCountInfo( $page );
3374                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3375
3376                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3377                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3378                         if( $talkInfo ) {
3379                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3380                         }
3381                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3382                         if( $talkInfo ) {
3383                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3384                         }
3385                         $wgOut->addHTML( '</ul>' );
3386                 }
3387         }
3388
3389         /**
3390          * Return the total number of edits and number of unique editors
3391          * on a given page. If page does not exist, returns false.
3392          *
3393          * @param $title Title object
3394          * @return array
3395          */
3396         protected function pageCountInfo( $title ) {
3397                 $id = $title->getArticleId();
3398                 if( $id == 0 ) {
3399                         return false;
3400                 }
3401                 $dbr = wfGetDB( DB_SLAVE );
3402                 $rev_clause = array( 'rev_page' => $id );
3403                 $edits = $dbr->selectField(
3404                         'revision',
3405                         'COUNT(rev_page)',
3406                         $rev_clause,
3407                         __METHOD__,
3408                         $this->getSelectOptions()
3409                 );
3410                 $authors = $dbr->selectField(
3411                         'revision',
3412                         'COUNT(DISTINCT rev_user_text)',
3413                         $rev_clause,
3414                         __METHOD__,
3415                         $this->getSelectOptions()
3416                 );
3417                 return array( 'edits' => $edits, 'authors' => $authors );
3418         }
3419
3420         /**
3421          * Return a list of templates used by this article.
3422          * Uses the templatelinks table
3423          *
3424          * @return Array of Title objects
3425          */
3426         public function getUsedTemplates() {
3427                 $result = array();
3428                 $id = $this->mTitle->getArticleID();
3429                 if( $id == 0 ) {
3430                         return array();
3431                 }
3432                 $dbr = wfGetDB( DB_SLAVE );
3433                 $res = $dbr->select( array( 'templatelinks' ),
3434                         array( 'tl_namespace', 'tl_title' ),
3435                         array( 'tl_from' => $id ),
3436                         __METHOD__ );
3437                 if( $res !== false ) {
3438                         foreach( $res as $row ) {
3439                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3440                         }
3441                 }
3442                 $dbr->freeResult( $res );
3443                 return $result;
3444         }
3445
3446         /**
3447          * Returns a list of hidden categories this page is a member of.
3448          * Uses the page_props and categorylinks tables.
3449          *
3450          * @return Array of Title objects
3451          */
3452         public function getHiddenCategories() {
3453                 $result = array();
3454                 $id = $this->mTitle->getArticleID();
3455                 if( $id == 0 ) {
3456                         return array();
3457                 }
3458                 $dbr = wfGetDB( DB_SLAVE );
3459                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3460                         array( 'cl_to' ),
3461                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3462                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3463                         __METHOD__ );
3464                 if( $res !== false ) {
3465                         foreach( $res as $row ) {
3466                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3467                         }
3468                 }
3469                 $dbr->freeResult( $res );
3470                 return $result;
3471         }
3472
3473         /**
3474         * Return an applicable autosummary if one exists for the given edit.
3475         * @param $oldtext String: the previous text of the page.
3476         * @param $newtext String: The submitted text of the page.
3477         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3478         * @return string An appropriate autosummary, or an empty string.
3479         */
3480         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3481                 # Decide what kind of autosummary is needed.
3482
3483                 # Redirect autosummaries
3484                 $ot = Title::newFromRedirect( $oldtext );
3485                 $rt = Title::newFromRedirect( $newtext );
3486                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3487                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3488                 }
3489
3490                 # New page autosummaries
3491                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3492                         # If they're making a new article, give its text, truncated, in the summary.
3493                         global $wgContLang;
3494                         $truncatedtext = $wgContLang->truncate(
3495                                 str_replace("\n", ' ', $newtext),
3496                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3497                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3498                 }
3499
3500                 # Blanking autosummaries
3501                 if( $oldtext != '' && $newtext == '' ) {
3502                         return wfMsgForContent( 'autosumm-blank' );
3503                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3504                         # Removing more than 90% of the article
3505                         global $wgContLang;
3506                         $truncatedtext = $wgContLang->truncate(
3507                                 $newtext,
3508                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3509                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3510                 }
3511
3512                 # If we reach this point, there's no applicable autosummary for our case, so our
3513                 # autosummary is empty.
3514                 return '';
3515         }
3516
3517         /**
3518          * Add the primary page-view wikitext to the output buffer
3519          * Saves the text into the parser cache if possible.
3520          * Updates templatelinks if it is out of date.
3521          *
3522          * @param $text String
3523          * @param $cache Boolean
3524          */
3525         public function outputWikiText( $text, $cache = true ) {
3526                 global $wgParser, $wgUser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3527
3528                 $popts = $wgOut->parserOptions();
3529                 $popts->setTidy(true);
3530                 $popts->enableLimitReport();
3531                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3532                         $popts, true, true, $this->getRevIdFetched() );
3533                 $popts->setTidy(false);
3534                 $popts->enableLimitReport( false );
3535                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3536                         $parserCache = ParserCache::singleton();
3537                         $parserCache->save( $parserOutput, $this, $wgUser );
3538                 }
3539                 // Make sure file cache is not used on uncacheable content.
3540                 // Output that has magic words in it can still use the parser cache
3541                 // (if enabled), though it will generally expire sooner.
3542                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3543                         $wgUseFileCache = false;
3544                 }
3545
3546                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3547                         // templatelinks table may have become out of sync,
3548                         // especially if using variable-based transclusions.
3549                         // For paranoia, check if things have changed and if
3550                         // so apply updates to the database. This will ensure
3551                         // that cascaded protections apply as soon as the changes
3552                         // are visible.
3553
3554                         # Get templates from templatelinks
3555                         $id = $this->mTitle->getArticleID();
3556
3557                         $tlTemplates = array();
3558
3559                         $dbr = wfGetDB( DB_SLAVE );
3560                         $res = $dbr->select( array( 'templatelinks' ),
3561                                 array( 'tl_namespace', 'tl_title' ),
3562                                 array( 'tl_from' => $id ),
3563                                 __METHOD__ );
3564
3565                         global $wgContLang;
3566                         foreach( $res as $row ) {
3567                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3568                         }
3569
3570                         # Get templates from parser output.
3571                         $poTemplates = array();
3572                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3573                                 foreach ( $templates as $dbk => $id ) {
3574                                         $key = $row->tl_namespace . ':'. $row->tl_title;
3575                                         $poTemplates["$ns:$dbk"] = true;
3576                                 }
3577                         }
3578
3579                         # Get the diff
3580                         # Note that we simulate array_diff_key in PHP <5.0.x
3581                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3582
3583                         if( count( $templates_diff ) > 0 ) {
3584                                 # Whee, link updates time.
3585                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3586                                 $u->doUpdate();
3587                         }
3588                 }
3589
3590                 $wgOut->addParserOutput( $parserOutput );
3591         }
3592
3593         /**
3594          * Update all the appropriate counts in the category table, given that
3595          * we've added the categories $added and deleted the categories $deleted.
3596          *
3597          * @param $added array   The names of categories that were added
3598          * @param $deleted array The names of categories that were deleted
3599          * @return null
3600          */
3601         public function updateCategoryCounts( $added, $deleted ) {
3602                 $ns = $this->mTitle->getNamespace();
3603                 $dbw = wfGetDB( DB_MASTER );
3604
3605                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3606                 # exist, we might legitimately not create it, but it's simpler to just
3607                 # create it and then give it a negative value, since the value is bogus
3608                 # anyway.
3609                 #
3610                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3611                 $insertCats = array_merge( $added, $deleted );
3612                 if( !$insertCats ) {
3613                         # Okay, nothing to do
3614                         return;
3615                 }
3616                 $insertRows = array();
3617                 foreach( $insertCats as $cat ) {
3618                         $insertRows[] = array( 'cat_title' => $cat );
3619                 }
3620                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3621
3622                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3623                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3624                 if( $ns == NS_CATEGORY ) {
3625                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3626                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3627                 } elseif( $ns == NS_FILE ) {
3628                         $addFields[]    = 'cat_files = cat_files + 1';
3629                         $removeFields[] = 'cat_files = cat_files - 1';
3630                 }
3631
3632                 if( $added ) {
3633                         $dbw->update(
3634                                 'category',
3635                                 $addFields,
3636                                 array( 'cat_title' => $added ),
3637                                 __METHOD__
3638                         );
3639                 }
3640                 if( $deleted ) {
3641                         $dbw->update(
3642                                 'category',
3643                                 $removeFields,
3644                                 array( 'cat_title' => $deleted ),
3645                                 __METHOD__
3646                         );
3647                 }
3648         }
3649 }