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                 $hideBit = Revision::DELETED_USER; // username hidden?
 701
 702                 $sql = "SELECT {$userTable}.*, MAX(rev_timestamp) as timestamp
 703                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 704                         WHERE rev_page = $pageId
 705                         AND rev_user != $user
 706                         AND rev_deleted & $hideBit = 0
 707                         GROUP BY rev_user, rev_user_text, user_real_name
 708                         ORDER BY timestamp DESC";
 709
 710                 if($limit > 0)
 711                         $sql = $dbr->limitResult($sql, $limit, $offset);
 712
 713                 $sql .= ' '. $this->getSelectOptions();
 714
 715                 $res = $dbr->query($sql, __METHOD__ );
 716
 717                 return new UserArrayFromResult( $res );
 718         }
 719
 720         /**
 721          * This is the default action of the script: just view the page of
 722          * the given title.
 723         */
 724         public function view() {
 725                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 726                 global $wgEnableParserCache, $wgStylePath, $wgParser;
 727                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 728                 global $wgDefaultRobotPolicy;
 729
 730                 # Let the parser know if this is the printable version
 731                 if( $wgOut->isPrintable() ) {
 732                         $wgOut->parserOptions()->setIsPrintable( true );
 733                 }
 734
 735                 wfProfileIn( __METHOD__ );
 736
 737                 # Get variables from query string
 738                 $oldid = $this->getOldID();
 739
 740                 # Try client and file cache
 741                 if( $oldid === 0 && $this->checkTouched() ) {
 742                         global $wgUseETag;
 743                         if( $wgUseETag ) {
 744                                 $parserCache = ParserCache::singleton();
 745                                 $wgOut->setETag( $parserCache->getETag($this, $wgOut->parserOptions()) );
 746                         }
 747                         # Is is client cached?
 748                         if( $wgOut->checkLastModified( $this->getTouched() ) ) {
 749                                 wfProfileOut( __METHOD__ );
 750                                 return;
 751                         # Try file cache
 752                         } else if( $this->tryFileCache() ) {
 753                                 # tell wgOut that output is taken care of
 754                                 $wgOut->disable();
 755                                 $this->viewUpdates();
 756                                 wfProfileOut( __METHOD__ );
 757                                 return;
 758                         }
 759                 }
 760
 761                 $ns = $this->mTitle->getNamespace(); # shortcut
 762                 $sk = $wgUser->getSkin();
 763
 764                 # getOldID may want us to redirect somewhere else
 765                 if( $this->mRedirectUrl ) {
 766                         $wgOut->redirect( $this->mRedirectUrl );
 767                         wfProfileOut( __METHOD__ );
 768                         return;
 769                 }
 770
 771                 $diff = $wgRequest->getVal( 'diff' );
 772                 $rcid = $wgRequest->getVal( 'rcid' );
 773                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 774                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 775                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 776                 $return404 = false;
 777
 778                 $wgOut->setArticleFlag( true );
 779
 780                 # Discourage indexing of printable versions, but encourage following
 781                 if( $wgOut->isPrintable() ) {
 782                         $policy = 'noindex,follow';
 783                 } elseif( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 784                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 785                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 786                         # Honour customised robot policies for this namespace
 787                         $policy = $wgNamespaceRobotPolicies[$ns];
 788                 } else {
 789                         $policy = $wgDefaultRobotPolicy;
 790                 }
 791                 $wgOut->setRobotPolicy( $policy );
 792
 793                 # Allow admins to see deleted content if explicitly requested
 794                 $delId = $diff ? $diff : $oldid;
 795                 $unhide = $wgRequest->getInt('unhide') == 1;
 796                 # If we got diff and oldid in the query, we want to see a
 797                 # diff page instead of the article.
 798                 if( !is_null( $diff ) ) {
 799                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 800
 801                         $htmldiff = $wgRequest->getVal( 'htmldiff' , false);
 802                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid, $purge, $htmldiff, $unhide );
 803                         // DifferenceEngine directly fetched the revision:
 804                         $this->mRevIdFetched = $de->mNewid;
 805                         $de->showDiffPage( $diffOnly );
 806
 807                         // Needed to get the page's current revision
 808                         $this->loadPageData();
 809                         if( $diff == 0 || $diff == $this->mLatest ) {
 810                                 # Run view updates for current revision only
 811                                 $this->viewUpdates();
 812                         }
 813                         wfProfileOut( __METHOD__ );
 814                         return;
 815                 }
 816
 817                 if( $ns == NS_USER || $ns == NS_USER_TALK ) {
 818                         # User/User_talk subpages are not modified. (bug 11443)
 819                         if( !$this->mTitle->isSubpage() ) {
 820                                 $block = new Block();
 821                                 if( $block->load( $this->mTitle->getBaseText() ) ) {
 822                                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 823                                 }
 824                         }
 825                 }
 826
 827                 # Should the parser cache be used?
 828                 $pcache = $this->useParserCache( $oldid );
 829                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 830                 if( $wgUser->getOption( 'stubthreshold' ) ) {
 831                         wfIncrStats( 'pcache_miss_stub' );
 832                 }
 833
 834                 $wasRedirected = false;
 835                 if( isset( $this->mRedirectedFrom ) ) {
 836                         // This is an internally redirected page view.
 837                         // We'll need a backlink to the source page for navigation.
 838                         if( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 839                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 840                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 841                                 $wgOut->setSubtitle( $s );
 842
 843                                 // Set the fragment if one was specified in the redirect
 844                                 if( strval( $this->mTitle->getFragment() ) != '' ) {
 845                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 846                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 847                                 }
 848
 849                                 // Add a <link rel="canonical"> tag
 850                                 $wgOut->addLink( array( 'rel' => 'canonical',
 851                                         'href' => $this->mTitle->getLocalURL() )
 852                                 );
 853                                 $wasRedirected = true;
 854                         }
 855                 } elseif( !empty( $rdfrom ) ) {
 856                         // This is an externally redirected view, from some other wiki.
 857                         // If it was reported from a trusted site, supply a backlink.
 858                         global $wgRedirectSources;
 859                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 860                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 861                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 862                                 $wgOut->setSubtitle( $s );
 863                                 $wasRedirected = true;
 864                         }
 865                 }
 866
 867                 # Allow a specific header on talk pages, like [[MediaWiki:Talkpagetext]]
 868                 if( $this->mTitle->isTalkPage() ) {
 869                         $msg = wfMsgNoTrans( 'talkpageheader' );
 870                         if ( $msg !== '-' && !wfEmptyMsg( 'talkpageheader', $msg ) ) {
 871                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1</div>", array( 'talkpageheader' ) );
 872                         }
 873                 }
 874
 875                 $outputDone = false;
 876                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 877                 if( $pcache && $wgOut->tryParserCache( $this ) ) {
 878                         // Ensure that UI elements requiring revision ID have
 879                         // the correct version information.
 880                         $wgOut->setRevisionId( $this->mLatest );
 881                         $outputDone = true;
 882                 }
 883                 # Fetch content and check for errors
 884                 if( !$outputDone ) {
 885                         # If the article does not exist and was deleted/moved, show the log
 886                         if( $this->getID() == 0 ) {
 887                                 $this->showLogs();
 888                         }
 889                         $text = $this->getContent();
 890                         // For now, check also for ID until getContent actually returns
 891                         // false for pages that do not exists
 892                         if( $text === false || $this->getID() === 0 ) {
 893                                 # Failed to load, replace text with error message
 894                                 $t = $this->mTitle->getPrefixedText();
 895                                 if( $oldid ) {
 896                                         $d = wfMsgExt( 'missingarticle-rev', 'escape', $oldid );
 897                                         $text = wfMsgExt( 'missing-article', 'parsemag', $t, $d );
 898                                 // Always use page content for pages in the MediaWiki namespace
 899                                 // since it contains the default message
 900                                 } elseif ( $this->mTitle->getNamespace() != NS_MEDIAWIKI ) {
 901                                         $text = wfMsgExt( 'noarticletext', 'parsemag' );
 902                                 }
 903                         }
 904
 905                         # Non-existent pages
 906                         if( $this->getID() === 0 ) {
 907                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 908                                 $text = "<div class='noarticletext'>\n$text\n</div>";
 909                                 if( !$this->hasViewableContent() ) {
 910                                         // If there's no backing content, send a 404 Not Found
 911                                         // for better machine handling of broken links.
 912                                         $return404 = true;
 913                                 }
 914                         }
 915
 916                         if( $return404 ) {
 917                                 $wgRequest->response()->header( "HTTP/1.x 404 Not Found" );
 918                         }
 919
 920                         # Another whitelist check in case oldid is altering the title
 921                         if( !$this->mTitle->userCanRead() ) {
 922                                 $wgOut->loginToUse();
 923                                 $wgOut->output();
 924                                 $wgOut->disable();
 925                                 wfProfileOut( __METHOD__ );
 926                                 return;
 927                         }
 928
 929                         # For ?curid=x urls, disallow indexing
 930                         if( $wgRequest->getInt('curid') )
 931                                 $wgOut->setRobotPolicy( 'noindex,follow' );
 932
 933                         # We're looking at an old revision
 934                         if( !empty( $oldid ) ) {
 935                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 936                                 if( is_null( $this->mRevision ) ) {
 937                                         // FIXME: This would be a nice place to load the 'no such page' text.
 938                                 } else {
 939                                         $this->setOldSubtitle( $oldid );
 940                                         # Allow admins to see deleted content if explicitly requested
 941                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 942                                                 // If the user is not allowed to see it...
 943                                                 if( !$this->mRevision->userCan(Revision::DELETED_TEXT) ) {
 944                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 945                                                                 'rev-deleted-text-permission' );
 946                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 947                                                         wfProfileOut( __METHOD__ );
 948                                                         return;
 949                                                 // If the user needs to confirm that they want to see it...
 950                                                 } else if( !$unhide ) {
 951                                                         # Give explanation and add a link to view the revision...
 952                                                         $link = $this->mTitle->getFullUrl( "oldid={$oldid}&unhide=1" );
 953                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 954                                                                 array('rev-deleted-text-unhide',$link) );
 955                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 956                                                         wfProfileOut( __METHOD__ );
 957                                                         return;
 958                                                 // We are allowed to see...
 959                                                 } else {
 960                                                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 961                                                                 'rev-deleted-text-view' );
 962                                                 }
 963                                         }
 964                                         // Is this the current revision and otherwise cacheable? Try the parser cache...
 965                                         if( $oldid === $this->getLatest() && $this->useParserCache( false )
 966                                                 && $wgOut->tryParserCache( $this ) )
 967                                         {
 968                                                 $outputDone = true;
 969                                         }
 970                                 }
 971                         }
 972
 973                         // Ensure that UI elements requiring revision ID have
 974                         // the correct version information.
 975                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 976
 977                         if( $outputDone ) {
 978                                 // do nothing...
 979                         // Pages containing custom CSS or JavaScript get special treatment
 980                         } else if( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
 981                                 $wgOut->addHTML( wfMsgExt( 'clearyourcache', 'parse' ) );
 982                                 // Give hooks a chance to customise the output
 983                                 if( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->mTitle, $wgOut ) ) ) {
 984                                         // Wrap the whole lot in a <pre> and don't parse
 985                                         $m = array();
 986                                         preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 987                                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 988                                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 989                                         $wgOut->addHTML( "\n</pre>\n" );
 990                                 }
 991                         } else if( $rt = Title::newFromRedirectArray( $text ) ) { # get an array of redirect targets
 992                                 # Don't append the subtitle if this was an old revision
 993                                 $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 994                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 995                                 $wgOut->addParserOutputNoText( $parseout );
 996                         } else if( $pcache ) {
 997                                 # Display content and save to parser cache
 998                                 $this->outputWikiText( $text );
 999                         } else {
1000                                 # Display content, don't attempt to save to parser cache
1001                                 # Don't show section-edit links on old revisions... this way lies madness.
1002                                 if( !$this->isCurrent() ) {
1003                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
1004                                 }
1005                                 # Display content and don't save to parser cache
1006                                 # With timing hack -- TS 2006-07-26
1007                                 $time = -wfTime();
1008                                 $this->outputWikiText( $text, false );
1009                                 $time += wfTime();
1010
1011                                 # Timing hack
1012                                 if( $time > 3 ) {
1013                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1014                                                 $this->mTitle->getPrefixedDBkey()));
1015                                 }
1016
1017                                 if( !$this->isCurrent() ) {
1018                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
1019                                 }
1020                         }
1021                 }
1022                 /* title may have been set from the cache */
1023                 $t = $wgOut->getPageTitle();
1024                 if( empty( $t ) ) {
1025                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1026
1027                         # For the main page, overwrite the <title> element with the con-
1028                         # tents of 'pagetitle-view-mainpage' instead of the default (if
1029                         # that's not empty).
1030                         if( $this->mTitle->equals( Title::newMainPage() ) &&
1031                         wfMsgForContent( 'pagetitle-view-mainpage' ) !== '' ) {
1032                                 $wgOut->setHTMLTitle( wfMsgForContent( 'pagetitle-view-mainpage' ) );
1033                         }
1034                 }
1035
1036                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1037                 if( $ns == NS_USER_TALK && IP::isValid( $this->mTitle->getText() ) ) {
1038                         $wgOut->addWikiMsg('anontalkpagetext');
1039                 }
1040
1041                 # If we have been passed an &rcid= parameter, we want to give the user a
1042                 # chance to mark this new article as patrolled.
1043                 if( !empty($rcid) && $this->mTitle->exists() && $this->mTitle->quickUserCan('patrol') ) {
1044                         $wgOut->addHTML(
1045                                 "<div class='patrollink'>" .
1046                                         wfMsgHtml( 'markaspatrolledlink',
1047                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
1048                                                 "action=markpatrolled&rcid=$rcid" )
1049                                         ) .
1050                                 '</div>'
1051                          );
1052                 }
1053
1054                 # Trackbacks
1055                 if( $wgUseTrackbacks ) {
1056                         $this->addTrackbacks();
1057                 }
1058
1059                 $this->viewUpdates();
1060                 wfProfileOut( __METHOD__ );
1061         }
1062
1063         protected function showLogs() {
1064                 global $wgUser, $wgOut;
1065                 $loglist = new LogEventsList( $wgUser->getSkin(), $wgOut );
1066                 $pager = new LogPager( $loglist, array('move', 'delete'), false, $this->mTitle->getPrefixedText() );
1067                 if( $pager->getNumRows() > 0 ) {
1068                         $pager->mLimit = 10;
1069                         $wgOut->addHTML( '<div class="mw-warning-with-logexcerpt">' );
1070                         $wgOut->addWikiMsg( 'moveddeleted-notice' );
1071                         $wgOut->addHTML(
1072                                 $loglist->beginLogEventsList() .
1073                                 $pager->getBody() .
1074                                 $loglist->endLogEventsList()
1075                         );
1076                         if( $pager->getNumRows() > 10 ) {
1077                                 $wgOut->addHTML( $wgUser->getSkin()->link(
1078                                         SpecialPage::getTitleFor( 'Log' ),
1079                                         wfMsgHtml( 'log-fulllog' ),
1080                                         array(),
1081                                         array( 'page' => $this->mTitle->getPrefixedText() )
1082                                 ) );
1083                         }
1084                         $wgOut->addHTML( '</div>' );
1085                 }
1086         }
1087
1088         /*
1089         * Should the parser cache be used?
1090         */
1091         protected function useParserCache( $oldid ) {
1092                 global $wgUser, $wgEnableParserCache;
1093
1094                 return $wgEnableParserCache
1095                         && intval( $wgUser->getOption( 'stubthreshold' ) ) == 0
1096                         && $this->exists()
1097                         && empty( $oldid )
1098                         && !$this->mTitle->isCssOrJsPage()
1099                         && !$this->mTitle->isCssJsSubpage();
1100         }
1101
1102         /**
1103          * View redirect
1104          * @param $target Title object or Array of destination(s) to redirect
1105          * @param $appendSubtitle Boolean [optional]
1106          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1107          */
1108         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1109                 global $wgParser, $wgOut, $wgContLang, $wgStylePath, $wgUser;
1110                 # Display redirect
1111                 if( !is_array( $target ) ) {
1112                         $target = array( $target );
1113                 }
1114                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1115                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1116                 $imageUrl2 = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1117                 $alt2 = $wgContLang->isRTL() ? '&larr;' : '&rarr;'; // should -> and <- be used instead of entities?
1118
1119                 if( $appendSubtitle ) {
1120                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1121                 }
1122                 $sk = $wgUser->getSkin();
1123                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1124                 $title = array_shift( $target );
1125                 if( $forceKnown ) {
1126                         $link = $sk->makeKnownLinkObj( $title, htmlspecialchars( $title->getFullText() ) );
1127                 } else {
1128                         $link = $sk->link( $title, htmlspecialchars( $title->getFullText() ) );
1129                 }
1130                 // automatically append redirect=no to each link, since most of them are redirect pages themselves
1131                 foreach( $target as $rt ) {
1132                         if( $forceKnown ) {
1133                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1134                                         . $sk->makeKnownLinkObj( $rt, htmlspecialchars( $rt->getFullText() ) );
1135                         } else {
1136                                 $link .= '<img src="'.$imageUrl2.'" alt="'.$alt2.' " />'
1137                                         . $sk->link( $rt, htmlspecialchars( $rt->getFullText() ) );
1138                         }
1139                 }
1140                 return '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
1141                         '<span class="redirectText">'.$link.'</span>';
1142
1143         }
1144
1145         public function addTrackbacks() {
1146                 global $wgOut, $wgUser;
1147                 $dbr = wfGetDB( DB_SLAVE );
1148                 $tbs = $dbr->select( 'trackbacks',
1149                         array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
1150                         array('tb_page' => $this->getID() )
1151                 );
1152                 if( !$dbr->numRows($tbs) ) return;
1153
1154                 $tbtext = "";
1155                 while( $o = $dbr->fetchObject($tbs) ) {
1156                         $rmvtxt = "";
1157                         if( $wgUser->isAllowed( 'trackback' ) ) {
1158                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid=" .
1159                                         $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
1160                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1161                         }
1162                         $tbtext .= "\n";
1163                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
1164                                         $o->tb_title,
1165                                         $o->tb_url,
1166                                         $o->tb_ex,
1167                                         $o->tb_name,
1168                                         $rmvtxt);
1169                 }
1170                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>$1</div>\n", array( 'trackbackbox', $tbtext ) );
1171                 $this->mTitle->invalidateCache();
1172         }
1173
1174         public function deletetrackback() {
1175                 global $wgUser, $wgRequest, $wgOut;
1176                 if( !$wgUser->matchEditToken($wgRequest->getVal('token')) ) {
1177                         $wgOut->addWikiMsg( 'sessionfailure' );
1178                         return;
1179                 }
1180
1181                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
1182                 if( count($permission_errors) ) {
1183                         $wgOut->showPermissionsErrorPage( $permission_errors );
1184                         return;
1185                 }
1186
1187                 $db = wfGetDB( DB_MASTER );
1188                 $db->delete( 'trackbacks', array('tb_id' => $wgRequest->getInt('tbid')) );
1189
1190                 $wgOut->addWikiMsg( 'trackbackdeleteok' );
1191                 $this->mTitle->invalidateCache();
1192         }
1193
1194         public function render() {
1195                 global $wgOut;
1196                 $wgOut->setArticleBodyOnly(true);
1197                 $this->view();
1198         }
1199
1200         /**
1201          * Handle action=purge
1202          */
1203         public function purge() {
1204                 global $wgUser, $wgRequest, $wgOut;
1205                 if( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
1206                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1207                                 $this->doPurge();
1208                                 $this->view();
1209                         }
1210                 } else {
1211                         $action = htmlspecialchars( $wgRequest->getRequestURL() );
1212                         $button = wfMsgExt( 'confirm_purge_button', array('escapenoentities') );
1213                         $form = "<form method=\"post\" action=\"$action\">\n" .
1214                                         "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
1215                                         "</form>\n";
1216                         $top = wfMsgExt( 'confirm-purge-top', array('parse') );
1217                         $bottom = wfMsgExt( 'confirm-purge-bottom', array('parse') );
1218                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
1219                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1220                         $wgOut->addHTML( $top . $form . $bottom );
1221                 }
1222         }
1223
1224         /**
1225          * Perform the actions of a page purging
1226          */
1227         public function doPurge() {
1228                 global $wgUseSquid;
1229                 // Invalidate the cache
1230                 $this->mTitle->invalidateCache();
1231
1232                 if( $wgUseSquid ) {
1233                         // Commit the transaction before the purge is sent
1234                         $dbw = wfGetDB( DB_MASTER );
1235                         $dbw->immediateCommit();
1236
1237                         // Send purge
1238                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1239                         $update->doUpdate();
1240                 }
1241                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1242                         global $wgMessageCache;
1243                         if( $this->getID() == 0 ) {
1244                                 $text = false;
1245                         } else {
1246                                 $text = $this->getRawText();
1247                         }
1248                         $wgMessageCache->replace( $this->mTitle->getDBkey(), $text );
1249                 }
1250         }
1251
1252         /**
1253          * Insert a new empty page record for this article.
1254          * This *must* be followed up by creating a revision
1255          * and running $this->updateToLatest( $rev_id );
1256          * or else the record will be left in a funky state.
1257          * Best if all done inside a transaction.
1258          *
1259          * @param $dbw Database
1260          * @return int The newly created page_id key, or false if the title already existed
1261          * @private
1262          */
1263         public function insertOn( $dbw ) {
1264                 wfProfileIn( __METHOD__ );
1265
1266                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1267                 $dbw->insert( 'page', array(
1268                         'page_id'           => $page_id,
1269                         'page_namespace'    => $this->mTitle->getNamespace(),
1270                         'page_title'        => $this->mTitle->getDBkey(),
1271                         'page_counter'      => 0,
1272                         'page_restrictions' => '',
1273                         'page_is_redirect'  => 0, # Will set this shortly...
1274                         'page_is_new'       => 1,
1275                         'page_random'       => wfRandom(),
1276                         'page_touched'      => $dbw->timestamp(),
1277                         'page_latest'       => 0, # Fill this in shortly...
1278                         'page_len'          => 0, # Fill this in shortly...
1279                 ), __METHOD__, 'IGNORE' );
1280
1281                 $affected = $dbw->affectedRows();
1282                 if( $affected ) {
1283                         $newid = $dbw->insertId();
1284                         $this->mTitle->resetArticleId( $newid );
1285                 }
1286                 wfProfileOut( __METHOD__ );
1287                 return $affected ? $newid : false;
1288         }
1289
1290         /**
1291          * Update the page record to point to a newly saved revision.
1292          *
1293          * @param $dbw Database object
1294          * @param $revision Revision: For ID number, and text used to set
1295                             length and redirect status fields
1296          * @param $lastRevision Integer: if given, will not overwrite the page field
1297          *                      when different from the currently set value.
1298          *                      Giving 0 indicates the new page flag should be set
1299          *                      on.
1300          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1301          *                                                       removing rows in redirect table.
1302          * @return bool true on success, false on failure
1303          * @private
1304          */
1305         public function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1306                 wfProfileIn( __METHOD__ );
1307
1308                 $text = $revision->getText();
1309                 $rt = Title::newFromRedirect( $text );
1310
1311                 $conditions = array( 'page_id' => $this->getId() );
1312                 if( !is_null( $lastRevision ) ) {
1313                         # An extra check against threads stepping on each other
1314                         $conditions['page_latest'] = $lastRevision;
1315                 }
1316
1317                 $dbw->update( 'page',
1318                         array( /* SET */
1319                                 'page_latest'      => $revision->getId(),
1320                                 'page_touched'     => $dbw->timestamp(),
1321                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1322                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1323                                 'page_len'         => strlen( $text ),
1324                         ),
1325                         $conditions,
1326                         __METHOD__ );
1327
1328                 $result = $dbw->affectedRows() != 0;
1329                 if( $result ) {
1330                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1331                 }
1332
1333                 wfProfileOut( __METHOD__ );
1334                 return $result;
1335         }
1336
1337         /**
1338          * Add row to the redirect table if this is a redirect, remove otherwise.
1339          *
1340          * @param $dbw Database
1341          * @param $redirectTitle a title object pointing to the redirect target,
1342          *                                               or NULL if this is not a redirect
1343          * @param $lastRevIsRedirect If given, will optimize adding and
1344          *                                                       removing rows in redirect table.
1345          * @return bool true on success, false on failure
1346          * @private
1347          */
1348         public function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1349                 // Always update redirects (target link might have changed)
1350                 // Update/Insert if we don't know if the last revision was a redirect or not
1351                 // Delete if changing from redirect to non-redirect
1352                 $isRedirect = !is_null($redirectTitle);
1353                 if($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1354                         wfProfileIn( __METHOD__ );
1355                         if( $isRedirect ) {
1356                                 // This title is a redirect, Add/Update row in the redirect table
1357                                 $set = array( /* SET */
1358                                         'rd_namespace' => $redirectTitle->getNamespace(),
1359                                         'rd_title'     => $redirectTitle->getDBkey(),
1360                                         'rd_from'      => $this->getId(),
1361                                 );
1362                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1363                         } else {
1364                                 // This is not a redirect, remove row from redirect table
1365                                 $where = array( 'rd_from' => $this->getId() );
1366                                 $dbw->delete( 'redirect', $where, __METHOD__);
1367                         }
1368                         if( $this->getTitle()->getNamespace() == NS_FILE ) {
1369                                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1370                         }
1371                         wfProfileOut( __METHOD__ );
1372                         return ( $dbw->affectedRows() != 0 );
1373                 }
1374                 return true;
1375         }
1376
1377         /**
1378          * If the given revision is newer than the currently set page_latest,
1379          * update the page record. Otherwise, do nothing.
1380          *
1381          * @param $dbw Database object
1382          * @param $revision Revision object
1383          */
1384         public function updateIfNewerOn( &$dbw, $revision ) {
1385                 wfProfileIn( __METHOD__ );
1386                 $row = $dbw->selectRow(
1387                         array( 'revision', 'page' ),
1388                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1389                         array(
1390                                 'page_id' => $this->getId(),
1391                                 'page_latest=rev_id' ),
1392                         __METHOD__ );
1393                 if( $row ) {
1394                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1395                                 wfProfileOut( __METHOD__ );
1396                                 return false;
1397                         }
1398                         $prev = $row->rev_id;
1399                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1400                 } else {
1401                         # No or missing previous revision; mark the page as new
1402                         $prev = 0;
1403                         $lastRevIsRedirect = null;
1404                 }
1405                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1406                 wfProfileOut( __METHOD__ );
1407                 return $ret;
1408         }
1409
1410         /**
1411          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
1412          * @return string Complete article text, or null if error
1413          */
1414         public function replaceSection( $section, $text, $summary = '', $edittime = NULL ) {
1415                 wfProfileIn( __METHOD__ );
1416                 if( strval( $section ) == '' ) {
1417                         // Whole-page edit; let the whole text through
1418                 } else {
1419                         if( is_null($edittime) ) {
1420                                 $rev = Revision::newFromTitle( $this->mTitle );
1421                         } else {
1422                                 $dbw = wfGetDB( DB_MASTER );
1423                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1424                         }
1425                         if( !$rev ) {
1426                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1427                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1428                                 return null;
1429                         }
1430                         $oldtext = $rev->getText();
1431
1432                         if( $section == 'new' ) {
1433                                 # Inserting a new section
1434                                 $subject = $summary ? wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n" : '';
1435                                 $text = strlen( trim( $oldtext ) ) > 0
1436                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1437                                                 : "{$subject}{$text}";
1438                         } else {
1439                                 # Replacing an existing section; roll out the big guns
1440                                 global $wgParser;
1441                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1442                         }
1443                 }
1444                 wfProfileOut( __METHOD__ );
1445                 return $text;
1446         }
1447
1448         /**
1449          * @deprecated use Article::doEdit()
1450          */
1451         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false, $bot=false ) {
1452                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1453                         ( $isminor ? EDIT_MINOR : 0 ) |
1454                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 ) |
1455                         ( $bot ? EDIT_FORCE_BOT : 0 );
1456
1457                 # If this is a comment, add the summary as headline
1458                 if( $comment && $summary != "" ) {
1459                         $text = wfMsgForContent('newsectionheaderdefaultlevel',$summary) . "\n\n".$text;
1460                 }
1461
1462                 $this->doEdit( $text, $summary, $flags );
1463
1464                 $dbw = wfGetDB( DB_MASTER );
1465                 if($watchthis) {
1466                         if(!$this->mTitle->userIsWatching()) {
1467                                 $dbw->begin();
1468                                 $this->doWatch();
1469                                 $dbw->commit();
1470                         }
1471                 } else {
1472                         if( $this->mTitle->userIsWatching() ) {
1473                                 $dbw->begin();
1474                                 $this->doUnwatch();
1475                                 $dbw->commit();
1476                         }
1477                 }
1478                 $this->doRedirect( $this->isRedirect( $text ) );
1479         }
1480
1481         /**
1482          * @deprecated use Article::doEdit()
1483          */
1484         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1485                 wfDeprecated( __METHOD__ );
1486                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1487                         ( $minor ? EDIT_MINOR : 0 ) |
1488                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1489
1490                 $status = $this->doEdit( $text, $summary, $flags );
1491                 if( !$status->isOK() ) {
1492                         return false;
1493                 }
1494
1495                 $dbw = wfGetDB( DB_MASTER );
1496                 if( $watchthis ) {
1497                         if(!$this->mTitle->userIsWatching()) {
1498                                 $dbw->begin();
1499                                 $this->doWatch();
1500                                 $dbw->commit();
1501                         }
1502                 } else {
1503                         if( $this->mTitle->userIsWatching() ) {
1504                                 $dbw->begin();
1505                                 $this->doUnwatch();
1506                                 $dbw->commit();
1507                         }
1508                 }
1509
1510                 $extraQuery = ''; // Give extensions a chance to modify URL query on update
1511                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this, &$sectionanchor, &$extraQuery ) );
1512
1513                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor, $extraQuery );
1514                 return true;
1515         }
1516
1517         /**
1518          * Article::doEdit()
1519          *
1520          * Change an existing article or create a new article. Updates RC and all necessary caches,
1521          * optionally via the deferred update array.
1522          *
1523          * $wgUser must be set before calling this function.
1524          *
1525          * @param $text String: new text
1526          * @param $summary String: edit summary
1527          * @param $flags Integer bitfield:
1528          *      EDIT_NEW
1529          *          Article is known or assumed to be non-existent, create a new one
1530          *      EDIT_UPDATE
1531          *          Article is known or assumed to be pre-existing, update it
1532          *      EDIT_MINOR
1533          *          Mark this edit minor, if the user is allowed to do so
1534          *      EDIT_SUPPRESS_RC
1535          *          Do not log the change in recentchanges
1536          *      EDIT_FORCE_BOT
1537          *          Mark the edit a "bot" edit regardless of user rights
1538          *      EDIT_DEFER_UPDATES
1539          *          Defer some of the updates until the end of index.php
1540          *      EDIT_AUTOSUMMARY
1541          *          Fill in blank summaries with generated text where possible
1542          *
1543          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1544          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
1545          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1546          * edit-already-exists error will be returned. These two conditions are also possible with
1547          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1548          *
1549          * @param $baseRevId the revision ID this edit was based off, if any
1550          * @param $user Optional user object, $wgUser will be used if not passed
1551          *
1552          * @return Status object. Possible errors:
1553          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1554          *     edit-gone-missing:       In update mode, but the article didn't exist
1555          *     edit-conflict:           In update mode, the article changed unexpectedly
1556          *     edit-no-change:          Warning that the text was the same as before
1557          *     edit-already-exists:     In creation mode, but the article already exists
1558          *
1559          *  Extensions may define additional errors.
1560          *
1561          *  $return->value will contain an associative array with members as follows:
1562          *     new:                     Boolean indicating if the function attempted to create a new article
1563          *     revision:                The revision object for the inserted revision, or null
1564          *
1565          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1566          */
1567         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1568                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1569
1570                 # Low-level sanity check
1571                 if( $this->mTitle->getText() == '' ) {
1572                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1573                 }
1574
1575                 wfProfileIn( __METHOD__ );
1576
1577                 $user = is_null($user) ? $wgUser : $user;
1578                 $status = Status::newGood( array() );
1579
1580                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
1581                 $this->loadPageData();
1582
1583                 if( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1584                         $aid = $this->mTitle->getArticleID();
1585                         if( $aid ) {
1586                                 $flags |= EDIT_UPDATE;
1587                         } else {
1588                                 $flags |= EDIT_NEW;
1589                         }
1590                 }
1591
1592                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
1593                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
1594                 {
1595                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1596                         wfProfileOut( __METHOD__ );
1597                         if( $status->isOK() ) {
1598                                 $status->fatal( 'edit-hook-aborted');
1599                         }
1600                         return $status;
1601                 }
1602
1603                 # Silently ignore EDIT_MINOR if not allowed
1604                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed('minoredit');
1605                 $bot = $flags & EDIT_FORCE_BOT;
1606
1607                 $oldtext = $this->getRawText(); // current revision
1608                 $oldsize = strlen( $oldtext );
1609
1610                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1611                 if( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1612                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1613                 }
1614
1615                 $editInfo = $this->prepareTextForEdit( $text );
1616                 $text = $editInfo->pst;
1617                 $newsize = strlen( $text );
1618
1619                 $dbw = wfGetDB( DB_MASTER );
1620                 $now = wfTimestampNow();
1621
1622                 if( $flags & EDIT_UPDATE ) {
1623                         # Update article, but only if changed.
1624                         $status->value['new'] = false;
1625                         # Make sure the revision is either completely inserted or not inserted at all
1626                         if( !$wgDBtransactions ) {
1627                                 $userAbort = ignore_user_abort( true );
1628                         }
1629
1630                         $revisionId = 0;
1631
1632                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1633
1634                         if( $changed ) {
1635                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1636                                   - (int)$this->isCountable( $oldtext );
1637                                 $this->mTotalAdjustment = 0;
1638
1639                                 if( !$this->mLatest ) {
1640                                         # Article gone missing
1641                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1642                                         $status->fatal( 'edit-gone-missing' );
1643                                         wfProfileOut( __METHOD__ );
1644                                         return $status;
1645                                 }
1646
1647                                 $revision = new Revision( array(
1648                                         'page'       => $this->getId(),
1649                                         'comment'    => $summary,
1650                                         'minor_edit' => $isminor,
1651                                         'text'       => $text,
1652                                         'parent_id'  => $this->mLatest,
1653                                         'user'       => $user->getId(),
1654                                         'user_text'  => $user->getName(),
1655                                         ) );
1656
1657                                 $dbw->begin();
1658                                 $revisionId = $revision->insertOn( $dbw );
1659
1660                                 # Update page
1661                                 #
1662                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1663                                 # during the course of this function. This makes sure that EditPage can detect
1664                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1665                                 # before this function is called. A previous function used a separate query, this
1666                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1667                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1668
1669                                 if( !$ok ) {
1670                                         /* Belated edit conflict! Run away!! */
1671                                         $status->fatal( 'edit-conflict' );
1672                                         # Delete the invalid revision if the DB is not transactional
1673                                         if( !$wgDBtransactions ) {
1674                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1675                                         }
1676                                         $revisionId = 0;
1677                                         $dbw->rollback();
1678                                 } else {
1679                                         global $wgUseRCPatrol;
1680                                         # Update recentchanges
1681                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1682                                                 # Mark as patrolled if the user can do so
1683                                                 $patrolled = $wgUseRCPatrol && $this->mTitle->userCan('autopatrol');
1684                                                 # Add RC row to the DB
1685                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1686                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1687                                                         $revisionId, $patrolled
1688                                                 );
1689                                                 # Log auto-patrolled edits
1690                                                 if( $patrolled ) {
1691                                                         PatrolLog::record( $rc, true );
1692                                                 }
1693                                         }
1694                                         # Notify extensions of a new edit
1695                                         wfRunHooks( 'NewRevisionFromEditComplete', array(&$this, $revision, $baseRevId, $user) );
1696                                         $user->incEditCount();
1697                                         $dbw->commit();
1698                                 }
1699                         } else {
1700                                 $status->warning( 'edit-no-change' );
1701                                 $revision = null;
1702                                 // Keep the same revision ID, but do some updates on it
1703                                 $revisionId = $this->getRevIdFetched();
1704                                 // Update page_touched, this is usually implicit in the page update
1705                                 // Other cache updates are done in onArticleEdit()
1706                                 $this->mTitle->invalidateCache();
1707                         }
1708
1709                         if( !$wgDBtransactions ) {
1710                                 ignore_user_abort( $userAbort );
1711                         }
1712                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1713                         if( !$status->isOK() ) {
1714                                 wfProfileOut( __METHOD__ );
1715                                 return $status;
1716                         }
1717
1718                         # Invalidate cache of this article and all pages using this article
1719                         # as a template. Partly deferred.
1720                         Article::onArticleEdit( $this->mTitle );
1721                         # Update links tables, site stats, etc.
1722                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1723                 } else {
1724                         # Create new article
1725                         $status->value['new'] = true;
1726
1727                         # Set statistics members
1728                         # We work out if it's countable after PST to avoid counter drift
1729                         # when articles are created with {{subst:}}
1730                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1731                         $this->mTotalAdjustment = 1;
1732
1733                         $dbw->begin();
1734
1735                         # Add the page record; stake our claim on this title!
1736                         # This will return false if the article already exists
1737                         $newid = $this->insertOn( $dbw );
1738
1739                         if( $newid === false ) {
1740                                 $dbw->rollback();
1741                                 $status->fatal( 'edit-already-exists' );
1742                                 wfProfileOut( __METHOD__ );
1743                                 return $status;
1744                         }
1745
1746                         # Save the revision text...
1747                         $revision = new Revision( array(
1748                                 'page'       => $newid,
1749                                 'comment'    => $summary,
1750                                 'minor_edit' => $isminor,
1751                                 'text'       => $text,
1752                                 'user'       => $user->getId(),
1753                                 'user_text'  => $user->getName(),
1754                                 ) );
1755                         $revisionId = $revision->insertOn( $dbw );
1756
1757                         $this->mTitle->resetArticleID( $newid );
1758
1759                         # Update the page record with revision data
1760                         $this->updateRevisionOn( $dbw, $revision, 0 );
1761
1762                         # Update recentchanges
1763                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1764                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1765                                 # Mark as patrolled if the user can do so
1766                                 $patrolled = ($wgUseRCPatrol || $wgUseNPPatrol) && $this->mTitle->userCan('autopatrol');
1767                                 # Add RC row to the DB
1768                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1769                                         '', strlen($text), $revisionId, $patrolled );
1770                                 # Log auto-patrolled edits
1771                                 if( $patrolled ) {
1772                                         PatrolLog::record( $rc, true );
1773                                 }
1774                         }
1775                         # Notify extensions of a new page edit
1776                         wfRunHooks( 'NewRevisionFromEditComplete', array(&$this, $revision, false, $user) );
1777                         $user->incEditCount();
1778                         $dbw->commit();
1779
1780                         # Update links, etc.
1781                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1782
1783                         # Clear caches
1784                         Article::onArticleCreate( $this->mTitle );
1785
1786                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1787                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1788                 }
1789
1790                 # Do updates right now unless deferral was requested
1791                 if( !( $flags & EDIT_DEFER_UPDATES ) ) {
1792                         wfDoUpdates();
1793                 }
1794
1795                 // Return the new revision (or null) to the caller
1796                 $status->value['revision'] = $revision;
1797
1798                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1799                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1800
1801                 wfProfileOut( __METHOD__ );
1802                 return $status;
1803         }
1804
1805         /**
1806          * @deprecated wrapper for doRedirect
1807          */
1808         public function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1809                 wfDeprecated( __METHOD__ );
1810                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1811         }
1812
1813         /**
1814          * Output a redirect back to the article.
1815          * This is typically used after an edit.
1816          *
1817          * @param $noRedir Boolean: add redirect=no
1818          * @param $sectionAnchor String: section to redirect to, including "#"
1819          * @param $extraQuery String: extra query params
1820          */
1821         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1822                 global $wgOut;
1823                 if( $noRedir ) {
1824                         $query = 'redirect=no';
1825                         if( $extraQuery )
1826                                 $query .= "&$query";
1827                 } else {
1828                         $query = $extraQuery;
1829                 }
1830                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1831         }
1832
1833         /**
1834          * Mark this particular edit/page as patrolled
1835          */
1836         public function markpatrolled() {
1837                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUseNPPatrol, $wgUser;
1838                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1839
1840                 # If we haven't been given an rc_id value, we can't do anything
1841                 $rcid = (int) $wgRequest->getVal('rcid');
1842                 $rc = RecentChange::newFromId($rcid);
1843                 if( is_null($rc) ) {
1844                         $wgOut->showErrorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1845                         return;
1846                 }
1847
1848                 #It would be nice to see where the user had actually come from, but for now just guess
1849                 $returnto = $rc->getAttribute( 'rc_type' ) == RC_NEW ? 'Newpages' : 'Recentchanges';
1850                 $return = SpecialPage::getTitleFor( $returnto );
1851
1852                 $dbw = wfGetDB( DB_MASTER );
1853                 $errors = $rc->doMarkPatrolled();
1854
1855                 if( in_array(array('rcpatroldisabled'), $errors) ) {
1856                         $wgOut->showErrorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1857                         return;
1858                 }
1859
1860                 if( in_array(array('hookaborted'), $errors) ) {
1861                         // The hook itself has handled any output
1862                         return;
1863                 }
1864
1865                 if( in_array(array('markedaspatrollederror-noautopatrol'), $errors) ) {
1866                         $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1867                         $wgOut->addWikiMsg( 'markedaspatrollederror-noautopatrol' );
1868                         $wgOut->returnToMain( false, $return );
1869                         return;
1870                 }
1871
1872                 if( !empty($errors) ) {
1873                         $wgOut->showPermissionsErrorPage( $errors );
1874                         return;
1875                 }
1876
1877                 # Inform the user
1878                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1879                 $wgOut->addWikiMsg( 'markedaspatrolledtext' );
1880                 $wgOut->returnToMain( false, $return );
1881         }
1882
1883         /**
1884          * User-interface handler for the "watch" action
1885          */
1886
1887         public function watch() {
1888                 global $wgUser, $wgOut;
1889                 if( $wgUser->isAnon() ) {
1890                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1891                         return;
1892                 }
1893                 if( wfReadOnly() ) {
1894                         $wgOut->readOnlyPage();
1895                         return;
1896                 }
1897                 if( $this->doWatch() ) {
1898                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1899                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1900                         $wgOut->addWikiMsg( 'addedwatchtext', $this->mTitle->getPrefixedText() );
1901                 }
1902                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1903         }
1904
1905         /**
1906          * Add this page to $wgUser's watchlist
1907          * @return bool true on successful watch operation
1908          */
1909         public function doWatch() {
1910                 global $wgUser;
1911                 if( $wgUser->isAnon() ) {
1912                         return false;
1913                 }
1914                 if( wfRunHooks('WatchArticle', array(&$wgUser, &$this)) ) {
1915                         $wgUser->addWatch( $this->mTitle );
1916                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1917                 }
1918                 return false;
1919         }
1920
1921         /**
1922          * User interface handler for the "unwatch" action.
1923          */
1924         public function unwatch() {
1925                 global $wgUser, $wgOut;
1926                 if( $wgUser->isAnon() ) {
1927                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1928                         return;
1929                 }
1930                 if( wfReadOnly() ) {
1931                         $wgOut->readOnlyPage();
1932                         return;
1933                 }
1934                 if( $this->doUnwatch() ) {
1935                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1936                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1937                         $wgOut->addWikiMsg( 'removedwatchtext', $this->mTitle->getPrefixedText() );
1938                 }
1939                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1940         }
1941
1942         /**
1943          * Stop watching a page
1944          * @return bool true on successful unwatch
1945          */
1946         public function doUnwatch() {
1947                 global $wgUser;
1948                 if( $wgUser->isAnon() ) {
1949                         return false;
1950                 }
1951                 if( wfRunHooks('UnwatchArticle', array(&$wgUser, &$this)) ) {
1952                         $wgUser->removeWatch( $this->mTitle );
1953                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1954                 }
1955                 return false;
1956         }
1957
1958         /**
1959          * action=protect handler
1960          */
1961         public function protect() {
1962                 $form = new ProtectionForm( $this );
1963                 $form->execute();
1964         }
1965
1966         /**
1967          * action=unprotect handler (alias)
1968          */
1969         public function unprotect() {
1970                 $this->protect();
1971         }
1972
1973         /**
1974          * Update the article's restriction field, and leave a log entry.
1975          *
1976          * @param $limit Array: set of restriction keys
1977          * @param $reason String
1978          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1979          * @param $expiry Array: per restriction type expiration
1980          * @return bool true on success
1981          */
1982         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1983                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1984
1985                 $id = $this->mTitle->getArticleID();
1986                 if ( $id <= 0 ) {
1987                         wfDebug( "updateRestrictions failed: $id <= 0\n" );
1988                         return false;
1989                 }
1990
1991                 if ( wfReadOnly() ) {
1992                         wfDebug( "updateRestrictions failed: read-only\n" );
1993                         return false;
1994                 }
1995
1996                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1997                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1998                         return false;
1999                 }
2000
2001                 if( !$cascade ) {
2002                         $cascade = false;
2003                 }
2004
2005                 // Take this opportunity to purge out expired restrictions
2006                 Title::purgeExpiredRestrictions();
2007
2008                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
2009                 # we expect a single selection, but the schema allows otherwise.
2010                 $current = array();
2011                 $updated = Article::flattenRestrictions( $limit );
2012                 $changed = false;
2013                 foreach( $wgRestrictionTypes as $action ) {
2014                         if( isset( $expiry[$action] ) ) {
2015                                 # Get current restrictions on $action
2016                                 $aLimits = $this->mTitle->getRestrictions( $action );
2017                                 $current[$action] = implode( '', $aLimits );
2018                                 # Are any actual restrictions being dealt with here?
2019                                 $aRChanged = count($aLimits) || !empty($limit[$action]);
2020                                 # If something changed, we need to log it. Checking $aRChanged
2021                                 # assures that "unprotecting" a page that is not protected does
2022                                 # not log just because the expiry was "changed".
2023                                 if( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
2024                                         $changed = true;
2025                                 }
2026                         }
2027                 }
2028
2029                 $current = Article::flattenRestrictions( $current );
2030
2031                 $changed = ($changed || $current != $updated );
2032                 $changed = $changed || ($updated && $this->mTitle->areRestrictionsCascading() != $cascade);
2033                 $protect = ( $updated != '' );
2034
2035                 # If nothing's changed, do nothing
2036                 if( $changed ) {
2037                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
2038
2039                                 $dbw = wfGetDB( DB_MASTER );
2040
2041                                 # Prepare a null revision to be added to the history
2042                                 $modified = $current != '' && $protect;
2043                                 if( $protect ) {
2044                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
2045                                 } else {
2046                                         $comment_type = 'unprotectedarticle';
2047                                 }
2048                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
2049
2050                                 # Only restrictions with the 'protect' right can cascade...
2051                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2052                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2053                                 # The schema allows multiple restrictions
2054                                 if(!in_array('protect', $editrestriction) && !in_array('sysop', $editrestriction))
2055                                         $cascade = false;
2056                                 $cascade_description = '';
2057                                 if( $cascade ) {
2058                                         $cascade_description = ' ['.wfMsgForContent('protect-summary-cascade').']';
2059                                 }
2060
2061                                 if( $reason )
2062                                         $comment .= ": $reason";
2063
2064                                 $editComment = $comment;
2065                                 $encodedExpiry = array();
2066                                 $protect_description = '';
2067                                 foreach( $limit as $action => $restrictions  ) {
2068                                         if ( !isset($expiry[$action]) )
2069                                                 $expiry[$action] = 'infinite';
2070
2071                                         $encodedExpiry[$action] = Block::encodeExpiry($expiry[$action], $dbw );
2072                                         if( $restrictions != '' ) {
2073                                                 $protect_description .= "[$action=$restrictions] (";
2074                                                 if( $encodedExpiry[$action] != 'infinity' ) {
2075                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
2076                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2077                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2078                                                                 $wgContLang->time( $expiry[$action], false, false ) );
2079                                                 } else {
2080                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
2081                                                 }
2082                                                 $protect_description .= ') ';
2083                                         }
2084                                 }
2085                                 $protect_description = trim($protect_description);
2086
2087                                 if( $protect_description && $protect )
2088                                         $editComment .= " ($protect_description)";
2089                                 if( $cascade )
2090                                         $editComment .= "$cascade_description";
2091                                 # Update restrictions table
2092                                 foreach( $limit as $action => $restrictions ) {
2093                                         if($restrictions != '' ) {
2094                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
2095                                                         array( 'pr_page' => $id,
2096                                                                 'pr_type' => $action,
2097                                                                 'pr_level' => $restrictions,
2098                                                                 'pr_cascade' => ($cascade && $action == 'edit') ? 1 : 0,
2099                                                                 'pr_expiry' => $encodedExpiry[$action] ), __METHOD__  );
2100                                         } else {
2101                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2102                                                         'pr_type' => $action ), __METHOD__ );
2103                                         }
2104                                 }
2105
2106                                 # Insert a null revision
2107                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2108                                 $nullRevId = $nullRevision->insertOn( $dbw );
2109
2110                                 $latest = $this->getLatest();
2111                                 # Update page record
2112                                 $dbw->update( 'page',
2113                                         array( /* SET */
2114                                                 'page_touched' => $dbw->timestamp(),
2115                                                 'page_restrictions' => '',
2116                                                 'page_latest' => $nullRevId
2117                                         ), array( /* WHERE */
2118                                                 'page_id' => $id
2119                                         ), 'Article::protect'
2120                                 );
2121
2122                                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $nullRevision, $latest, $wgUser) );
2123                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
2124
2125                                 # Update the protection log
2126                                 $log = new LogPage( 'protect' );
2127                                 if( $protect ) {
2128                                         $params = array($protect_description,$cascade ? 'cascade' : '');
2129                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason), $params );
2130                                 } else {
2131                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
2132                                 }
2133
2134                         } # End hook
2135                 } # End "changed" check
2136
2137                 return true;
2138         }
2139
2140         /**
2141          * Take an array of page restrictions and flatten it to a string
2142          * suitable for insertion into the page_restrictions field.
2143          * @param $limit Array
2144          * @return String
2145          */
2146         protected static function flattenRestrictions( $limit ) {
2147                 if( !is_array( $limit ) ) {
2148                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
2149                 }
2150                 $bits = array();
2151                 ksort( $limit );
2152                 foreach( $limit as $action => $restrictions ) {
2153                         if( $restrictions != '' ) {
2154                                 $bits[] = "$action=$restrictions";
2155                         }
2156                 }
2157                 return implode( ':', $bits );
2158         }
2159
2160         /**
2161          * Auto-generates a deletion reason
2162          * @param &$hasHistory Boolean: whether the page has a history
2163          */
2164         public function generateReason( &$hasHistory ) {
2165                 global $wgContLang;
2166                 $dbw = wfGetDB( DB_MASTER );
2167                 // Get the last revision
2168                 $rev = Revision::newFromTitle( $this->mTitle );
2169                 if( is_null( $rev ) )
2170                         return false;
2171
2172                 // Get the article's contents
2173                 $contents = $rev->getText();
2174                 $blank = false;
2175                 // If the page is blank, use the text from the previous revision,
2176                 // which can only be blank if there's a move/import/protect dummy revision involved
2177                 if( $contents == '' ) {
2178                         $prev = $rev->getPrevious();
2179                         if( $prev )     {
2180                                 $contents = $prev->getText();
2181                                 $blank = true;
2182                         }
2183                 }
2184
2185                 // Find out if there was only one contributor
2186                 // Only scan the last 20 revisions
2187                 $res = $dbw->select( 'revision', 'rev_user_text',
2188                         array( 'rev_page' => $this->getID(), 'rev_deleted & '.Revision::DELETED_USER.'=0' ),
2189                         __METHOD__,
2190                         array( 'LIMIT' => 20 )
2191                 );
2192                 if( $res === false )
2193                         // This page has no revisions, which is very weird
2194                         return false;
2195
2196                 $hasHistory = ( $res->numRows() > 1 );
2197                 $row = $dbw->fetchObject( $res );
2198                 $onlyAuthor = $row->rev_user_text;
2199                 // Try to find a second contributor
2200                 foreach( $res as $row ) {
2201                         if( $row->rev_user_text != $onlyAuthor ) {
2202                                 $onlyAuthor = false;
2203                                 break;
2204                         }
2205                 }
2206                 $dbw->freeResult( $res );
2207
2208                 // Generate the summary with a '$1' placeholder
2209                 if( $blank ) {
2210                         // The current revision is blank and the one before is also
2211                         // blank. It's just not our lucky day
2212                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2213                 } else {
2214                         if( $onlyAuthor )
2215                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2216                         else
2217                                 $reason = wfMsgForContent( 'excontent', '$1' );
2218                 }
2219
2220                 if( $reason == '-' ) {
2221                         // Allow these UI messages to be blanked out cleanly
2222                         return '';
2223                 }
2224
2225                 // Replace newlines with spaces to prevent uglyness
2226                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2227                 // Calculate the maximum amount of chars to get
2228                 // Max content length = max comment length - length of the comment (excl. $1) - '...'
2229                 $maxLength = 255 - (strlen( $reason ) - 2) - 3;
2230                 $contents = $wgContLang->truncate( $contents, $maxLength );
2231                 // Remove possible unfinished links
2232                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2233                 // Now replace the '$1' placeholder
2234                 $reason = str_replace( '$1', $contents, $reason );
2235                 return $reason;
2236         }
2237
2238
2239         /*
2240          * UI entry point for page deletion
2241          */
2242         public function delete() {
2243                 global $wgUser, $wgOut, $wgRequest;
2244
2245                 $confirm = $wgRequest->wasPosted() &&
2246                                 $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
2247
2248                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
2249                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
2250
2251                 $reason = $this->DeleteReasonList;
2252
2253                 if( $reason != 'other' && $this->DeleteReason != '' ) {
2254                         // Entry from drop down menu + additional comment
2255                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
2256                 } elseif( $reason == 'other' ) {
2257                         $reason = $this->DeleteReason;
2258                 }
2259                 # Flag to hide all contents of the archived revisions
2260                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $wgUser->isAllowed( 'suppressrevision' );
2261
2262                 # This code desperately needs to be totally rewritten
2263
2264                 # Read-only check...
2265                 if( wfReadOnly() ) {
2266                         $wgOut->readOnlyPage();
2267                         return;
2268                 }
2269
2270                 # Check permissions
2271                 $permission_errors = $this->mTitle->getUserPermissionsErrors( 'delete', $wgUser );
2272
2273                 if( count( $permission_errors ) > 0 ) {
2274                         $wgOut->showPermissionsErrorPage( $permission_errors );
2275                         return;
2276                 }
2277
2278                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->mTitle->getPrefixedText() ) );
2279
2280                 # Better double-check that it hasn't been deleted yet!
2281                 $dbw = wfGetDB( DB_MASTER );
2282                 $conds = $this->mTitle->pageCond();
2283                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
2284                 if( $latest === false ) {
2285                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2286                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2287                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2288                         return;
2289                 }
2290
2291                 # Hack for big sites
2292                 $bigHistory = $this->isBigDeletion();
2293                 if( $bigHistory && !$this->mTitle->userCan( 'bigdelete' ) ) {
2294                         global $wgLang, $wgDeleteRevisionsLimit;
2295                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2296                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2297                         return;
2298                 }
2299
2300                 if( $confirm ) {
2301                         $this->doDelete( $reason, $suppress );
2302                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
2303                                 $this->doWatch();
2304                         } elseif( $this->mTitle->userIsWatching() ) {
2305                                 $this->doUnwatch();
2306                         }
2307                         return;
2308                 }
2309
2310                 // Generate deletion reason
2311                 $hasHistory = false;
2312                 if( !$reason ) $reason = $this->generateReason($hasHistory);
2313
2314                 // If the page has a history, insert a warning
2315                 if( $hasHistory && !$confirm ) {
2316                         $skin = $wgUser->getSkin();
2317                         $wgOut->addHTML( '<strong>' . wfMsgExt( 'historywarning', array( 'parseinline' ) ) . ' ' . $skin->historyLink() . '</strong>' );
2318                         if( $bigHistory ) {
2319                                 global $wgLang, $wgDeleteRevisionsLimit;
2320                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1</div>\n",
2321                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
2322                         }
2323                 }
2324
2325                 return $this->confirmDelete( $reason );
2326         }
2327
2328         /**
2329          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
2330          */
2331         public function isBigDeletion() {
2332                 global $wgDeleteRevisionsLimit;
2333                 if( $wgDeleteRevisionsLimit ) {
2334                         $revCount = $this->estimateRevisionCount();
2335                         return $revCount > $wgDeleteRevisionsLimit;
2336                 }
2337                 return false;
2338         }
2339
2340         /**
2341          * @return int approximate revision count
2342          */
2343         public function estimateRevisionCount() {
2344                 $dbr = wfGetDB( DB_SLAVE );
2345                 // For an exact count...
2346                 //return $dbr->selectField( 'revision', 'COUNT(*)',
2347                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
2348                 return $dbr->estimateRowCount( 'revision', '*',
2349                         array( 'rev_page' => $this->getId() ), __METHOD__ );
2350         }
2351
2352         /**
2353          * Get the last N authors
2354          * @param $num Integer: number of revisions to get
2355          * @param $revLatest String: the latest rev_id, selected from the master (optional)
2356          * @return array Array of authors, duplicates not removed
2357          */
2358         public function getLastNAuthors( $num, $revLatest = 0 ) {
2359                 wfProfileIn( __METHOD__ );
2360                 // First try the slave
2361                 // If that doesn't have the latest revision, try the master
2362                 $continue = 2;
2363                 $db = wfGetDB( DB_SLAVE );
2364                 do {
2365                         $res = $db->select( array( 'page', 'revision' ),
2366                                 array( 'rev_id', 'rev_user_text' ),
2367                                 array(
2368                                         'page_namespace' => $this->mTitle->getNamespace(),
2369                                         'page_title' => $this->mTitle->getDBkey(),
2370                                         'rev_page = page_id'
2371                                 ), __METHOD__, $this->getSelectOptions( array(
2372                                         'ORDER BY' => 'rev_timestamp DESC',
2373                                         'LIMIT' => $num
2374                                 ) )
2375                         );
2376                         if( !$res ) {
2377                                 wfProfileOut( __METHOD__ );
2378                                 return array();
2379                         }
2380                         $row = $db->fetchObject( $res );
2381                         if( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
2382                                 $db = wfGetDB( DB_MASTER );
2383                                 $continue--;
2384                         } else {
2385                                 $continue = 0;
2386                         }
2387                 } while ( $continue );
2388
2389                 $authors = array( $row->rev_user_text );
2390                 while ( $row = $db->fetchObject( $res ) ) {
2391                         $authors[] = $row->rev_user_text;
2392                 }
2393                 wfProfileOut( __METHOD__ );
2394                 return $authors;
2395         }
2396
2397         /**
2398          * Output deletion confirmation dialog
2399          * @param $reason String: prefilled reason
2400          */
2401         public function confirmDelete( $reason ) {
2402                 global $wgOut, $wgUser;
2403
2404                 wfDebug( "Article::confirmDelete\n" );
2405
2406                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $wgUser->getSkin()->makeKnownLinkObj( $this->mTitle ) ) );
2407                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2408                 $wgOut->addWikiMsg( 'confirmdeletetext' );
2409
2410                 if( $wgUser->isAllowed( 'suppressrevision' ) ) {
2411                         $suppress = "<tr id=\"wpDeleteSuppressRow\" name=\"wpDeleteSuppressRow\">
2412                                         <td></td>
2413                                         <td class='mw-input'><strong>" .
2414                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
2415                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
2416                                         "</strong></td>
2417                                 </tr>";
2418                 } else {
2419                         $suppress = '';
2420                 }
2421                 $checkWatch = $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching();
2422
2423                 $form = Xml::openElement( 'form', array( 'method' => 'post',
2424                         'action' => $this->mTitle->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
2425                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
2426                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
2427                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
2428                         "<tr id=\"wpDeleteReasonListRow\">
2429                                 <td class='mw-label'>" .
2430                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
2431                                 "</td>
2432                                 <td class='mw-input'>" .
2433                                         Xml::listDropDown( 'wpDeleteReasonList',
2434                                                 wfMsgForContent( 'deletereason-dropdown' ),
2435                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
2436                                 "</td>
2437                         </tr>
2438                         <tr id=\"wpDeleteReasonRow\">
2439                                 <td class='mw-label'>" .
2440                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
2441                                 "</td>
2442                                 <td class='mw-input'>" .
2443                                         Xml::input( 'wpReason', 60, $reason, array( 'type' => 'text', 'maxlength' => '255',
2444                                                 'tabindex' => '2', 'id' => 'wpReason' ) ) .
2445                                 "</td>
2446                         </tr>
2447                         <tr>
2448                                 <td></td>
2449                                 <td class='mw-input'>" .
2450                                         Xml::checkLabel( wfMsg( 'watchthis' ),
2451                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
2452                                 "</td>
2453                         </tr>
2454                         $suppress
2455                         <tr>
2456                                 <td></td>
2457                                 <td class='mw-submit'>" .
2458                                         Xml::submitButton( wfMsg( 'deletepage' ),
2459                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
2460                                 "</td>
2461                         </tr>" .
2462                         Xml::closeElement( 'table' ) .
2463                         Xml::closeElement( 'fieldset' ) .
2464                         Xml::hidden( 'wpEditToken', $wgUser->editToken() ) .
2465                         Xml::closeElement( 'form' );
2466
2467                         if( $wgUser->isAllowed( 'editinterface' ) ) {
2468                                 $skin = $wgUser->getSkin();
2469                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
2470                                 $link = $skin->link(
2471                                         $title,
2472                                         wfMsgHtml( 'delete-edit-reasonlist' ),
2473                                         array(),
2474                                         array( 'action' => 'edit' )
2475                                 );
2476                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
2477                         }
2478
2479                 $wgOut->addHTML( $form );
2480                 LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2481         }
2482
2483         /**
2484          * Perform a deletion and output success or failure messages
2485          */
2486         public function doDelete( $reason, $suppress = false ) {
2487                 global $wgOut, $wgUser;
2488                 $id = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2489
2490                 $error = '';
2491                 if( wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason, &$error)) ) {
2492                         if( $this->doDeleteArticle( $reason, $suppress, $id ) ) {
2493                                 $deleted = $this->mTitle->getPrefixedText();
2494
2495                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2496                                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2497
2498                                 $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
2499
2500                                 $wgOut->addWikiMsg( 'deletedtext', $deleted, $loglink );
2501                                 $wgOut->returnToMain( false );
2502                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason, $id));
2503                         } else {
2504                                 if( $error == '' ) {
2505                                         $wgOut->showFatalError( wfMsgExt( 'cannotdelete', array( 'parse' ) ) );
2506                                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
2507                                         LogEventsList::showLogExtract( $wgOut, 'delete', $this->mTitle->getPrefixedText() );
2508                                 } else {
2509                                         $wgOut->showFatalError( $error );
2510                                 }
2511                         }
2512                 }
2513         }
2514
2515         /**
2516          * Back-end article deletion
2517          * Deletes the article with database consistency, writes logs, purges caches
2518          * Returns success
2519          */
2520         public function doDeleteArticle( $reason, $suppress = false, $id = 0 ) {
2521                 global $wgUseSquid, $wgDeferredUpdateList;
2522                 global $wgUseTrackbacks;
2523
2524                 wfDebug( __METHOD__."\n" );
2525
2526                 $dbw = wfGetDB( DB_MASTER );
2527                 $ns = $this->mTitle->getNamespace();
2528                 $t = $this->mTitle->getDBkey();
2529                 $id = $id ? $id : $this->mTitle->getArticleID( GAID_FOR_UPDATE );
2530
2531                 if( $t == '' || $id == 0 ) {
2532                         return false;
2533                 }
2534
2535                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getRawText() ), -1 );
2536                 array_push( $wgDeferredUpdateList, $u );
2537
2538                 // Bitfields to further suppress the content
2539                 if( $suppress ) {
2540                         $bitfield = 0;
2541                         // This should be 15...
2542                         $bitfield |= Revision::DELETED_TEXT;
2543                         $bitfield |= Revision::DELETED_COMMENT;
2544                         $bitfield |= Revision::DELETED_USER;
2545                         $bitfield |= Revision::DELETED_RESTRICTED;
2546                 } else {
2547                         $bitfield = 'rev_deleted';
2548                 }
2549
2550                 $dbw->begin();
2551                 // For now, shunt the revision data into the archive table.
2552                 // Text is *not* removed from the text table; bulk storage
2553                 // is left intact to avoid breaking block-compression or
2554                 // immutable storage schemes.
2555                 //
2556                 // For backwards compatibility, note that some older archive
2557                 // table entries will have ar_text and ar_flags fields still.
2558                 //
2559                 // In the future, we may keep revisions and mark them with
2560                 // the rev_deleted field, which is reserved for this purpose.
2561                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2562                         array(
2563                                 'ar_namespace'  => 'page_namespace',
2564                                 'ar_title'      => 'page_title',
2565                                 'ar_comment'    => 'rev_comment',
2566                                 'ar_user'       => 'rev_user',
2567                                 'ar_user_text'  => 'rev_user_text',
2568                                 'ar_timestamp'  => 'rev_timestamp',
2569                                 'ar_minor_edit' => 'rev_minor_edit',
2570                                 'ar_rev_id'     => 'rev_id',
2571                                 'ar_text_id'    => 'rev_text_id',
2572                                 'ar_text'       => '\'\'', // Be explicit to appease
2573                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2574                                 'ar_len'        => 'rev_len',
2575                                 'ar_page_id'    => 'page_id',
2576                                 'ar_deleted'    => $bitfield
2577                         ), array(
2578                                 'page_id' => $id,
2579                                 'page_id = rev_page'
2580                         ), __METHOD__
2581                 );
2582
2583                 # Delete restrictions for it
2584                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2585
2586                 # Now that it's safely backed up, delete it
2587                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2588                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
2589                 if( !$ok ) {
2590                         $dbw->rollback();
2591                         return false;
2592                 }
2593
2594                 # Fix category table counts
2595                 $cats = array();
2596                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
2597                 foreach( $res as $row ) {
2598                         $cats []= $row->cl_to;
2599                 }
2600                 $this->updateCategoryCounts( array(), $cats );
2601
2602                 # If using cascading deletes, we can skip some explicit deletes
2603                 if( !$dbw->cascadingDeletes() ) {
2604                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2605
2606                         if($wgUseTrackbacks)
2607                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2608
2609                         # Delete outgoing links
2610                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2611                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2612                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2613                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2614                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2615                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2616                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2617                 }
2618
2619                 # If using cleanup triggers, we can skip some manual deletes
2620                 if( !$dbw->cleanupTriggers() ) {
2621                         # Clean up recentchanges entries...
2622                         $dbw->delete( 'recentchanges',
2623                                 array( 'rc_type != '.RC_LOG,
2624                                         'rc_namespace' => $this->mTitle->getNamespace(),
2625                                         'rc_title' => $this->mTitle->getDBkey() ),
2626                                 __METHOD__ );
2627                         $dbw->delete( 'recentchanges',
2628                                 array( 'rc_type != '.RC_LOG, 'rc_cur_id' => $id ),
2629                                 __METHOD__ );
2630                 }
2631
2632                 # Clear caches
2633                 Article::onArticleDelete( $this->mTitle );
2634
2635                 # Clear the cached article id so the interface doesn't act like we exist
2636                 $this->mTitle->resetArticleID( 0 );
2637
2638                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2639                 $logtype = $suppress ? 'suppress' : 'delete';
2640                 $log = new LogPage( $logtype );
2641
2642                 # Make sure logging got through
2643                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
2644
2645                 $dbw->commit();
2646
2647                 return true;
2648         }
2649
2650         /**
2651          * Roll back the most recent consecutive set of edits to a page
2652          * from the same user; fails if there are no eligible edits to
2653          * roll back to, e.g. user is the sole contributor. This function
2654          * performs permissions checks on $wgUser, then calls commitRollback()
2655          * to do the dirty work
2656          *
2657          * @param $fromP String: Name of the user whose edits to rollback.
2658          * @param $summary String: Custom summary. Set to default summary if empty.
2659          * @param $token String: Rollback token.
2660          * @param $bot Boolean: If true, mark all reverted edits as bot.
2661          *
2662          * @param $resultDetails Array: contains result-specific array of additional values
2663          *    'alreadyrolled' : 'current' (rev)
2664          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2665          *
2666          * @return array of errors, each error formatted as
2667          *   array(messagekey, param1, param2, ...).
2668          * On success, the array is empty.  This array can also be passed to
2669          * OutputPage::showPermissionsErrorPage().
2670          */
2671         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails ) {
2672                 global $wgUser;
2673                 $resultDetails = null;
2674
2675                 # Check permissions
2676                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
2677                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser );
2678                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2679
2680                 if( !$wgUser->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) )
2681                         $errors[] = array( 'sessionfailure' );
2682
2683                 if( $wgUser->pingLimiter( 'rollback' ) || $wgUser->pingLimiter() ) {
2684                         $errors[] = array( 'actionthrottledtext' );
2685                 }
2686                 # If there were errors, bail out now
2687                 if( !empty( $errors ) )
2688                         return $errors;
2689
2690                 return $this->commitRollback($fromP, $summary, $bot, $resultDetails);
2691         }
2692
2693         /**
2694          * Backend implementation of doRollback(), please refer there for parameter
2695          * and return value documentation
2696          *
2697          * NOTE: This function does NOT check ANY permissions, it just commits the
2698          * rollback to the DB Therefore, you should only call this function direct-
2699          * ly if you want to use custom permissions checks. If you don't, use
2700          * doRollback() instead.
2701          */
2702         public function commitRollback($fromP, $summary, $bot, &$resultDetails) {
2703                 global $wgUseRCPatrol, $wgUser, $wgLang;
2704                 $dbw = wfGetDB( DB_MASTER );
2705
2706                 if( wfReadOnly() ) {
2707                         return array( array( 'readonlytext' ) );
2708                 }
2709
2710                 # Get the last editor
2711                 $current = Revision::newFromTitle( $this->mTitle );
2712                 if( is_null( $current ) ) {
2713                         # Something wrong... no page?
2714                         return array(array('notanarticle'));
2715                 }
2716
2717                 $from = str_replace( '_', ' ', $fromP );
2718                 if( $from != $current->getUserText() ) {
2719                         $resultDetails = array( 'current' => $current );
2720                         return array(array('alreadyrolled',
2721                                 htmlspecialchars($this->mTitle->getPrefixedText()),
2722                                 htmlspecialchars($fromP),
2723                                 htmlspecialchars($current->getUserText())
2724                         ));
2725                 }
2726
2727                 # Get the last edit not by this guy
2728                 $user = intval( $current->getUser() );
2729                 $user_text = $dbw->addQuotes( $current->getUserText() );
2730                 $s = $dbw->selectRow( 'revision',
2731                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2732                         array(  'rev_page' => $current->getPage(),
2733                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2734                         ), __METHOD__,
2735                         array(  'USE INDEX' => 'page_timestamp',
2736                                 'ORDER BY'  => 'rev_timestamp DESC' )
2737                         );
2738                 if( $s === false ) {
2739                         # No one else ever edited this page
2740                         return array(array('cantrollback'));
2741                 } else if( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
2742                         # Only admins can see this text
2743                         return array(array('notvisiblerev'));
2744                 }
2745
2746                 $set = array();
2747                 if( $bot && $wgUser->isAllowed('markbotedits') ) {
2748                         # Mark all reverted edits as bot
2749                         $set['rc_bot'] = 1;
2750                 }
2751                 if( $wgUseRCPatrol ) {
2752                         # Mark all reverted edits as patrolled
2753                         $set['rc_patrolled'] = 1;
2754                 }
2755
2756                 if( $set ) {
2757                         $dbw->update( 'recentchanges', $set,
2758                                         array( /* WHERE */
2759                                                 'rc_cur_id' => $current->getPage(),
2760                                                 'rc_user_text' => $current->getUserText(),
2761                                                 "rc_timestamp > '{$s->rev_timestamp}'",
2762                                         ), __METHOD__
2763                                 );
2764                 }
2765
2766                 # Generate the edit summary if necessary
2767                 $target = Revision::newFromId( $s->rev_id );
2768                 if( empty( $summary ) ){
2769                         $summary = wfMsgForContent( 'revertpage' );
2770                 }
2771
2772                 # Allow the custom summary to use the same args as the default message
2773                 $args = array(
2774                         $target->getUserText(), $from, $s->rev_id,
2775                         $wgLang->timeanddate(wfTimestamp(TS_MW, $s->rev_timestamp), true),
2776                         $current->getId(), $wgLang->timeanddate($current->getTimestamp())
2777                 );
2778                 $summary = wfMsgReplaceArgs( $summary, $args );
2779
2780                 # Save
2781                 $flags = EDIT_UPDATE;
2782
2783                 if( $wgUser->isAllowed('minoredit') )
2784                         $flags |= EDIT_MINOR;
2785
2786                 if( $bot && ($wgUser->isAllowed('markbotedits') || $wgUser->isAllowed('bot')) )
2787                         $flags |= EDIT_FORCE_BOT;
2788                 # Actually store the edit
2789                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
2790                 if( !empty( $status->value['revision'] ) ) {
2791                         $revId = $status->value['revision']->getId();
2792                 } else {
2793                         $revId = false;
2794                 }
2795
2796                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $wgUser, $target, $current ) );
2797
2798                 $resultDetails = array(
2799                         'summary' => $summary,
2800                         'current' => $current,
2801                         'target' => $target,
2802                         'newid' => $revId
2803                 );
2804                 return array();
2805         }
2806
2807         /**
2808          * User interface for rollback operations
2809          */
2810         public function rollback() {
2811                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2812                 $details = null;
2813
2814                 $result = $this->doRollback(
2815                         $wgRequest->getVal( 'from' ),
2816                         $wgRequest->getText( 'summary' ),
2817                         $wgRequest->getVal( 'token' ),
2818                         $wgRequest->getBool( 'bot' ),
2819                         $details
2820                 );
2821
2822                 if( in_array( array( 'actionthrottledtext' ), $result ) ) {
2823                         $wgOut->rateLimited();
2824                         return;
2825                 }
2826                 if( isset( $result[0][0] ) && ( $result[0][0] == 'alreadyrolled' || $result[0][0] == 'cantrollback' ) ) {
2827                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2828                         $errArray = $result[0];
2829                         $errMsg = array_shift( $errArray );
2830                         $wgOut->addWikiMsgArray( $errMsg, $errArray );
2831                         if( isset( $details['current'] ) ){
2832                                 $current = $details['current'];
2833                                 if( $current->getComment() != '' ) {
2834                                         $wgOut->addWikiMsgArray( 'editcomment', array(
2835                                                 $wgUser->getSkin()->formatComment( $current->getComment() ) ), array( 'replaceafter' ) );
2836                                 }
2837                         }
2838                         return;
2839                 }
2840                 # Display permissions errors before read-only message -- there's no
2841                 # point in misleading the user into thinking the inability to rollback
2842                 # is only temporary.
2843                 if( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
2844                         # array_diff is completely broken for arrays of arrays, sigh.  Re-
2845                         # move any 'readonlytext' error manually.
2846                         $out = array();
2847                         foreach( $result as $error ) {
2848                                 if( $error != array( 'readonlytext' ) ) {
2849                                         $out []= $error;
2850                                 }
2851                         }
2852                         $wgOut->showPermissionsErrorPage( $out );
2853                         return;
2854                 }
2855                 if( $result == array( array( 'readonlytext' ) ) ) {
2856                         $wgOut->readOnlyPage();
2857                         return;
2858                 }
2859
2860                 $current = $details['current'];
2861                 $target = $details['target'];
2862                 $newId = $details['newid'];
2863                 $wgOut->setPageTitle( wfMsg( 'actioncomplete' ) );
2864                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2865                 $old = $wgUser->getSkin()->userLink( $current->getUser(), $current->getUserText() )
2866                         . $wgUser->getSkin()->userToolLinks( $current->getUser(), $current->getUserText() );
2867                 $new = $wgUser->getSkin()->userLink( $target->getUser(), $target->getUserText() )
2868                         . $wgUser->getSkin()->userToolLinks( $target->getUser(), $target->getUserText() );
2869                 $wgOut->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
2870                 $wgOut->returnToMain( false, $this->mTitle );
2871
2872                 if( !$wgRequest->getBool( 'hidediff', false ) && !$wgUser->getBoolOption( 'norollbackdiff', false ) ) {
2873                         $de = new DifferenceEngine( $this->mTitle, $current->getId(), $newId, false, true );
2874                         $de->showDiff( '', '' );
2875                 }
2876         }
2877
2878
2879         /**
2880          * Do standard deferred updates after page view
2881          */
2882         public function viewUpdates() {
2883                 global $wgDeferredUpdateList, $wgDisableCounters, $wgUser;
2884                 # Don't update page view counters on views from bot users (bug 14044)
2885                 if( !$wgDisableCounters && !$wgUser->isAllowed('bot') && $this->getID() ) {
2886                         Article::incViewCount( $this->getID() );
2887                         $u = new SiteStatsUpdate( 1, 0, 0 );
2888                         array_push( $wgDeferredUpdateList, $u );
2889                 }
2890                 # Update newtalk / watchlist notification status
2891                 $wgUser->clearNotification( $this->mTitle );
2892         }
2893
2894         /**
2895          * Prepare text which is about to be saved.
2896          * Returns a stdclass with source, pst and output members
2897          */
2898         public function prepareTextForEdit( $text, $revid=null ) {
2899                 if( $this->mPreparedEdit && $this->mPreparedEdit->newText == $text && $this->mPreparedEdit->revid == $revid) {
2900                         // Already prepared
2901                         return $this->mPreparedEdit;
2902                 }
2903                 global $wgParser;
2904                 $edit = (object)array();
2905                 $edit->revid = $revid;
2906                 $edit->newText = $text;
2907                 $edit->pst = $this->preSaveTransform( $text );
2908                 $options = new ParserOptions;
2909                 $options->setTidy( true );
2910                 $options->enableLimitReport();
2911                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $options, true, true, $revid );
2912                 $edit->oldText = $this->getContent();
2913                 $this->mPreparedEdit = $edit;
2914                 return $edit;
2915         }
2916
2917         /**
2918          * Do standard deferred updates after page edit.
2919          * Update links tables, site stats, search index and message cache.
2920          * Purges pages that include this page if the text was changed here.
2921          * Every 100th edit, prune the recent changes table.
2922          *
2923          * @private
2924          * @param $text New text of the article
2925          * @param $summary Edit summary
2926          * @param $minoredit Minor edit
2927          * @param $timestamp_of_pagechange Timestamp associated with the page change
2928          * @param $newid rev_id value of the new revision
2929          * @param $changed Whether or not the content actually changed
2930          */
2931         public function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2932                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser, $wgEnableParserCache;
2933
2934                 wfProfileIn( __METHOD__ );
2935
2936                 # Parse the text
2937                 # Be careful not to double-PST: $text is usually already PST-ed once
2938                 if( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2939                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2940                         $editInfo = $this->prepareTextForEdit( $text, $newid );
2941                 } else {
2942                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2943                         $editInfo = $this->mPreparedEdit;
2944                 }
2945
2946                 # Save it to the parser cache
2947                 if( $wgEnableParserCache ) {
2948                         $popts = new ParserOptions;
2949                         $popts->setTidy( true );
2950                         $popts->enableLimitReport();
2951                         $parserCache = ParserCache::singleton();
2952                         $parserCache->save( $editInfo->output, $this, $popts );
2953                 }
2954
2955                 # Update the links tables
2956                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
2957                 $u->doUpdate();
2958
2959                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
2960
2961                 if( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2962                         if( 0 == mt_rand( 0, 99 ) ) {
2963                                 // Flush old entries from the `recentchanges` table; we do this on
2964                                 // random requests so as to avoid an increase in writes for no good reason
2965                                 global $wgRCMaxAge;
2966                                 $dbw = wfGetDB( DB_MASTER );
2967                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2968                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2969                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2970                                 $dbw->query( $sql );
2971                         }
2972                 }
2973
2974                 $id = $this->getID();
2975                 $title = $this->mTitle->getPrefixedDBkey();
2976                 $shortTitle = $this->mTitle->getDBkey();
2977
2978                 if( 0 == $id ) {
2979                         wfProfileOut( __METHOD__ );
2980                         return;
2981                 }
2982
2983                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2984                 array_push( $wgDeferredUpdateList, $u );
2985                 $u = new SearchUpdate( $id, $title, $text );
2986                 array_push( $wgDeferredUpdateList, $u );
2987
2988                 # If this is another user's talk page, update newtalk
2989                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2990                 # load of user talk pages and piss people off, nor if it's a minor edit
2991                 # by a properly-flagged bot.
2992                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2993                         && !( $minoredit && $wgUser->isAllowed( 'nominornewtalk' ) ) ) {
2994                         if( wfRunHooks('ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2995                                 $other = User::newFromName( $shortTitle, false );
2996                                 if( !$other ) {
2997                                         wfDebug( __METHOD__.": invalid username\n" );
2998                                 } elseif( User::isIP( $shortTitle ) ) {
2999                                         // An anonymous user
3000                                         $other->setNewtalk( true );
3001                                 } elseif( $other->isLoggedIn() ) {
3002                                         $other->setNewtalk( true );
3003                                 } else {
3004                                         wfDebug( __METHOD__. ": don't need to notify a nonexistent user\n" );
3005                                 }
3006                         }
3007                 }
3008
3009                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3010                         $wgMessageCache->replace( $shortTitle, $text );
3011                 }
3012
3013                 wfProfileOut( __METHOD__ );
3014         }
3015
3016         /**
3017          * Perform article updates on a special page creation.
3018          *
3019          * @param $rev Revision object
3020          *
3021          * @todo This is a shitty interface function. Kill it and replace the
3022          * other shitty functions like editUpdates and such so it's not needed
3023          * anymore.
3024          */
3025         public function createUpdates( $rev ) {
3026                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
3027                 $this->mTotalAdjustment = 1;
3028                 $this->editUpdates( $rev->getText(), $rev->getComment(),
3029                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
3030         }
3031
3032         /**
3033          * Generate the navigation links when browsing through an article revisions
3034          * It shows the information as:
3035          *   Revision as of \<date\>; view current revision
3036          *   \<- Previous version | Next Version -\>
3037          *
3038          * @param $oldid String: revision ID of this article revision
3039          */
3040         public function setOldSubtitle( $oldid = 0 ) {
3041                 global $wgLang, $wgOut, $wgUser, $wgRequest;
3042
3043                 if( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
3044                         return;
3045                 }
3046
3047                 $revision = Revision::newFromId( $oldid );
3048
3049                 $current = ( $oldid == $this->mLatest );
3050                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
3051                 $sk = $wgUser->getSkin();
3052                 $lnk = $current
3053                         ? wfMsgHtml( 'currentrevisionlink' )
3054                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'currentrevisionlink' ) );
3055                 $curdiff = $current
3056                         ? wfMsgHtml( 'diff' )
3057                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=cur&oldid='.$oldid );
3058                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
3059                 $prevlink = $prev
3060                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
3061                         : wfMsgHtml( 'previousrevision' );
3062                 $prevdiff = $prev
3063                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=prev&oldid='.$oldid )
3064                         : wfMsgHtml( 'diff' );
3065                 $nextlink = $current
3066                         ? wfMsgHtml( 'nextrevision' )
3067                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'nextrevision' ), 'direction=next&oldid='.$oldid );
3068                 $nextdiff = $current
3069                         ? wfMsgHtml( 'diff' )
3070                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml( 'diff' ), 'diff=next&oldid='.$oldid );
3071
3072                 $cdel='';
3073                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
3074                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
3075                         if( $revision->isCurrent() ) {
3076                         // We don't handle top deleted edits too well
3077                                 $cdel = wfMsgHtml( 'rev-delundel' );
3078                         } else if( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
3079                         // If revision was hidden from sysops
3080                                 $cdel = wfMsgHtml( 'rev-delundel' );
3081                         } else {
3082                                 $cdel = $sk->makeKnownLinkObj( $revdel,
3083                                         wfMsgHtml('rev-delundel'),
3084                                         'type=revision' .
3085                                         '&target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
3086                                         '&ids=' . urlencode( $oldid ) );
3087                                 // Bolden oversighted content
3088                                 if( $revision->isDeleted( Revision::DELETED_RESTRICTED ) )
3089                                         $cdel = "<strong>$cdel</strong>";
3090                         }
3091                         $cdel = "(<small>$cdel</small>) ";
3092                 }
3093                 $unhide = $wgRequest->getInt('unhide') == 1 && $wgUser->matchEditToken( $wgRequest->getVal('token'), $oldid );
3094                 # Show user links if allowed to see them. If hidden, then show them only if requested...
3095                 $userlinks = $sk->revUserTools( $revision, !$unhide );
3096
3097                 $m = wfMsg( 'revision-info-current' );
3098                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
3099                         ? 'revision-info-current'
3100                         : 'revision-info';
3101
3102                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsgExt( $infomsg, array( 'parseinline', 'replaceafter' ),
3103                         $td, $userlinks, $revision->getID() ) . "</div>\n" .
3104
3105                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
3106                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
3107                 $wgOut->setSubtitle( $r );
3108         }
3109
3110         /**
3111          * This function is called right before saving the wikitext,
3112          * so we can do things like signatures and links-in-context.
3113          *
3114          * @param $text String
3115          */
3116         public function preSaveTransform( $text ) {
3117                 global $wgParser, $wgUser;
3118                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
3119         }
3120
3121         /* Caching functions */
3122
3123         /**
3124          * checkLastModified returns true if it has taken care of all
3125          * output to the client that is necessary for this request.
3126          * (that is, it has sent a cached version of the page)
3127          */
3128         protected function tryFileCache() {
3129                 static $called = false;
3130                 if( $called ) {
3131                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
3132                         return false;
3133                 }
3134                 $called = true;
3135                 if( $this->isFileCacheable() ) {
3136                         $cache = new HTMLFileCache( $this->mTitle );
3137                         if( $cache->isFileCacheGood( $this->mTouched ) ) {
3138                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
3139                                 $cache->loadFromFileCache();
3140                                 return true;
3141                         } else {
3142                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
3143                                 ob_start( array(&$cache, 'saveToFileCache' ) );
3144                         }
3145                 } else {
3146                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
3147                 }
3148                 return false;
3149         }
3150
3151         /**
3152          * Check if the page can be cached
3153          * @return bool
3154          */
3155         public function isFileCacheable() {
3156                 $cacheable = false;
3157                 if( HTMLFileCache::useFileCache() ) {
3158                         $cacheable = $this->getID() && !$this->mRedirectedFrom;
3159                         // Extension may have reason to disable file caching on some pages.
3160                         if( $cacheable ) {
3161                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
3162                         }
3163                 }
3164                 return $cacheable;
3165         }
3166
3167         /**
3168          * Loads page_touched and returns a value indicating if it should be used
3169          *
3170          */
3171         public function checkTouched() {
3172                 if( !$this->mDataLoaded ) {
3173                         $this->loadPageData();
3174                 }
3175                 return !$this->mIsRedirect;
3176         }
3177
3178         /**
3179          * Get the page_touched field
3180          */
3181         public function getTouched() {
3182                 # Ensure that page data has been loaded
3183                 if( !$this->mDataLoaded ) {
3184                         $this->loadPageData();
3185                 }
3186                 return $this->mTouched;
3187         }
3188
3189         /**
3190          * Get the page_latest field
3191          */
3192         public function getLatest() {
3193                 if( !$this->mDataLoaded ) {
3194                         $this->loadPageData();
3195                 }
3196                 return (int)$this->mLatest;
3197         }
3198
3199         /**
3200          * Edit an article without doing all that other stuff
3201          * The article must already exist; link tables etc
3202          * are not updated, caches are not flushed.
3203          *
3204          * @param $text String: text submitted
3205          * @param $comment String: comment submitted
3206          * @param $minor Boolean: whereas it's a minor modification
3207          */
3208         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3209                 wfProfileIn( __METHOD__ );
3210
3211                 $dbw = wfGetDB( DB_MASTER );
3212                 $revision = new Revision( array(
3213                         'page'       => $this->getId(),
3214                         'text'       => $text,
3215                         'comment'    => $comment,
3216                         'minor_edit' => $minor ? 1 : 0,
3217                         ) );
3218                 $revision->insertOn( $dbw );
3219                 $this->updateRevisionOn( $dbw, $revision );
3220
3221                 wfRunHooks( 'NewRevisionFromEditComplete', array($this, $revision, false, $wgUser) );
3222
3223                 wfProfileOut( __METHOD__ );
3224         }
3225
3226         /**
3227          * Used to increment the view counter
3228          *
3229          * @param $id Integer: article id
3230          */
3231         public static function incViewCount( $id ) {
3232                 $id = intval( $id );
3233                 global $wgHitcounterUpdateFreq, $wgDBtype;
3234
3235                 $dbw = wfGetDB( DB_MASTER );
3236                 $pageTable = $dbw->tableName( 'page' );
3237                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
3238                 $acchitsTable = $dbw->tableName( 'acchits' );
3239
3240                 if( $wgHitcounterUpdateFreq <= 1 ) {
3241                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
3242                         return;
3243                 }
3244
3245                 # Not important enough to warrant an error page in case of failure
3246                 $oldignore = $dbw->ignoreErrors( true );
3247
3248                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
3249
3250                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
3251                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
3252                         # Most of the time (or on SQL errors), skip row count check
3253                         $dbw->ignoreErrors( $oldignore );
3254                         return;
3255                 }
3256
3257                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
3258                 $row = $dbw->fetchObject( $res );
3259                 $rown = intval( $row->n );
3260                 if( $rown >= $wgHitcounterUpdateFreq ){
3261                         wfProfileIn( 'Article::incViewCount-collect' );
3262                         $old_user_abort = ignore_user_abort( true );
3263
3264                         if($wgDBtype == 'mysql')
3265                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
3266                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
3267                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
3268                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
3269                                 'GROUP BY hc_id');
3270                         $dbw->query("DELETE FROM $hitcounterTable");
3271                         if($wgDBtype == 'mysql') {
3272                                 $dbw->query('UNLOCK TABLES');
3273                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
3274                                         'WHERE page_id = hc_id');
3275                         }
3276                         else {
3277                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
3278                                         "FROM $acchitsTable WHERE page_id = hc_id");
3279                         }
3280                         $dbw->query("DROP TABLE $acchitsTable");
3281
3282                         ignore_user_abort( $old_user_abort );
3283                         wfProfileOut( 'Article::incViewCount-collect' );
3284                 }
3285                 $dbw->ignoreErrors( $oldignore );
3286         }
3287
3288         /**#@+
3289          * The onArticle*() functions are supposed to be a kind of hooks
3290          * which should be called whenever any of the specified actions
3291          * are done.
3292          *
3293          * This is a good place to put code to clear caches, for instance.
3294          *
3295          * This is called on page move and undelete, as well as edit
3296          *
3297          * @param $title a title object
3298          */
3299
3300         public static function onArticleCreate( $title ) {
3301                 # Update existence markers on article/talk tabs...
3302                 if( $title->isTalkPage() ) {
3303                         $other = $title->getSubjectPage();
3304                 } else {
3305                         $other = $title->getTalkPage();
3306                 }
3307                 $other->invalidateCache();
3308                 $other->purgeSquid();
3309
3310                 $title->touchLinks();
3311                 $title->purgeSquid();
3312                 $title->deleteTitleProtection();
3313         }
3314
3315         public static function onArticleDelete( $title ) {
3316                 global $wgMessageCache;
3317                 # Update existence markers on article/talk tabs...
3318                 if( $title->isTalkPage() ) {
3319                         $other = $title->getSubjectPage();
3320                 } else {
3321                         $other = $title->getTalkPage();
3322                 }
3323                 $other->invalidateCache();
3324                 $other->purgeSquid();
3325
3326                 $title->touchLinks();
3327                 $title->purgeSquid();
3328
3329                 # File cache
3330                 HTMLFileCache::clearFileCache( $title );
3331
3332                 # Messages
3333                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
3334                         $wgMessageCache->replace( $title->getDBkey(), false );
3335                 }
3336                 # Images
3337                 if( $title->getNamespace() == NS_FILE ) {
3338                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3339                         $update->doUpdate();
3340                 }
3341                 # User talk pages
3342                 if( $title->getNamespace() == NS_USER_TALK ) {
3343                         $user = User::newFromName( $title->getText(), false );
3344                         $user->setNewtalk( false );
3345                 }
3346                 # Image redirects
3347                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3348         }
3349
3350         /**
3351          * Purge caches on page update etc
3352          */
3353         public static function onArticleEdit( $title, $flags = '' ) {
3354                 global $wgDeferredUpdateList;
3355
3356                 // Invalidate caches of articles which include this page
3357                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
3358
3359                 // Invalidate the caches of all pages which redirect here
3360                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
3361
3362                 # Purge squid for this page only
3363                 $title->purgeSquid();
3364
3365                 # Clear file cache for this page only
3366                 HTMLFileCache::clearFileCache( $title );
3367         }
3368
3369         /**#@-*/
3370
3371         /**
3372          * Overriden by ImagePage class, only present here to avoid a fatal error
3373          * Called for ?action=revert
3374          */
3375         public function revert() {
3376                 global $wgOut;
3377                 $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3378         }
3379
3380         /**
3381          * Info about this page
3382          * Called for ?action=info when $wgAllowPageInfo is on.
3383          */
3384         public function info() {
3385                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
3386
3387                 if( !$wgAllowPageInfo ) {
3388                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
3389                         return;
3390                 }
3391
3392                 $page = $this->mTitle->getSubjectPage();
3393
3394                 $wgOut->setPagetitle( $page->getPrefixedText() );
3395                 $wgOut->setPageTitleActionText( wfMsg( 'info_short' ) );
3396                 $wgOut->setSubtitle( wfMsgHtml( 'infosubtitle' ) );
3397
3398                 if( !$this->mTitle->exists() ) {
3399                         $wgOut->addHTML( '<div class="noarticletext">' );
3400                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
3401                                 // This doesn't quite make sense; the user is asking for
3402                                 // information about the _page_, not the message... -- RC
3403                                 $wgOut->addHTML( htmlspecialchars( wfMsgWeirdKey( $this->mTitle->getText() ) ) );
3404                         } else {
3405                                 $msg = $wgUser->isLoggedIn()
3406                                         ? 'noarticletext'
3407                                         : 'noarticletextanon';
3408                                 $wgOut->addHTML( wfMsgExt( $msg, 'parse' ) );
3409                         }
3410                         $wgOut->addHTML( '</div>' );
3411                 } else {
3412                         $dbr = wfGetDB( DB_SLAVE );
3413                         $wl_clause = array(
3414                                 'wl_title'     => $page->getDBkey(),
3415                                 'wl_namespace' => $page->getNamespace() );
3416                         $numwatchers = $dbr->selectField(
3417                                 'watchlist',
3418                                 'COUNT(*)',
3419                                 $wl_clause,
3420                                 __METHOD__,
3421                                 $this->getSelectOptions() );
3422
3423                         $pageInfo = $this->pageCountInfo( $page );
3424                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
3425
3426                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
3427                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
3428                         if( $talkInfo ) {
3429                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
3430                         }
3431                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
3432                         if( $talkInfo ) {
3433                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
3434                         }
3435                         $wgOut->addHTML( '</ul>' );
3436                 }
3437         }
3438
3439         /**
3440          * Return the total number of edits and number of unique editors
3441          * on a given page. If page does not exist, returns false.
3442          *
3443          * @param $title Title object
3444          * @return array
3445          */
3446         public function pageCountInfo( $title ) {
3447                 $id = $title->getArticleId();
3448                 if( $id == 0 ) {
3449                         return false;
3450                 }
3451                 $dbr = wfGetDB( DB_SLAVE );
3452                 $rev_clause = array( 'rev_page' => $id );
3453                 $edits = $dbr->selectField(
3454                         'revision',
3455                         'COUNT(rev_page)',
3456                         $rev_clause,
3457                         __METHOD__,
3458                         $this->getSelectOptions()
3459                 );
3460                 $authors = $dbr->selectField(
3461                         'revision',
3462                         'COUNT(DISTINCT rev_user_text)',
3463                         $rev_clause,
3464                         __METHOD__,
3465                         $this->getSelectOptions()
3466                 );
3467                 return array( 'edits' => $edits, 'authors' => $authors );
3468         }
3469
3470         /**
3471          * Return a list of templates used by this article.
3472          * Uses the templatelinks table
3473          *
3474          * @return Array of Title objects
3475          */
3476         public function getUsedTemplates() {
3477                 $result = array();
3478                 $id = $this->mTitle->getArticleID();
3479                 if( $id == 0 ) {
3480                         return array();
3481                 }
3482                 $dbr = wfGetDB( DB_SLAVE );
3483                 $res = $dbr->select( array( 'templatelinks' ),
3484                         array( 'tl_namespace', 'tl_title' ),
3485                         array( 'tl_from' => $id ),
3486                         __METHOD__ );
3487                 if( $res !== false ) {
3488                         foreach( $res as $row ) {
3489                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
3490                         }
3491                 }
3492                 $dbr->freeResult( $res );
3493                 return $result;
3494         }
3495
3496         /**
3497          * Returns a list of hidden categories this page is a member of.
3498          * Uses the page_props and categorylinks tables.
3499          *
3500          * @return Array of Title objects
3501          */
3502         public function getHiddenCategories() {
3503                 $result = array();
3504                 $id = $this->mTitle->getArticleID();
3505                 if( $id == 0 ) {
3506                         return array();
3507                 }
3508                 $dbr = wfGetDB( DB_SLAVE );
3509                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3510                         array( 'cl_to' ),
3511                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3512                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to'),
3513                         __METHOD__ );
3514                 if( $res !== false ) {
3515                         foreach( $res as $row ) {
3516                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3517                         }
3518                 }
3519                 $dbr->freeResult( $res );
3520                 return $result;
3521         }
3522
3523         /**
3524         * Return an applicable autosummary if one exists for the given edit.
3525         * @param $oldtext String: the previous text of the page.
3526         * @param $newtext String: The submitted text of the page.
3527         * @param $flags Bitmask: a bitmask of flags submitted for the edit.
3528         * @return string An appropriate autosummary, or an empty string.
3529         */
3530         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3531                 # Decide what kind of autosummary is needed.
3532
3533                 # Redirect autosummaries
3534                 $ot = Title::newFromRedirect( $oldtext );
3535                 $rt = Title::newFromRedirect( $newtext );
3536                 if( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
3537                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
3538                 }
3539
3540                 # New page autosummaries
3541                 if( $flags & EDIT_NEW && strlen( $newtext ) ) {
3542                         # If they're making a new article, give its text, truncated, in the summary.
3543                         global $wgContLang;
3544                         $truncatedtext = $wgContLang->truncate(
3545                                 str_replace("\n", ' ', $newtext),
3546                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
3547                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
3548                 }
3549
3550                 # Blanking autosummaries
3551                 if( $oldtext != '' && $newtext == '' ) {
3552                         return wfMsgForContent( 'autosumm-blank' );
3553                 } elseif( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500) {
3554                         # Removing more than 90% of the article
3555                         global $wgContLang;
3556                         $truncatedtext = $wgContLang->truncate(
3557                                 $newtext,
3558                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
3559                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
3560                 }
3561
3562                 # If we reach this point, there's no applicable autosummary for our case, so our
3563                 # autosummary is empty.
3564                 return '';
3565         }
3566
3567         /**
3568          * Add the primary page-view wikitext to the output buffer
3569          * Saves the text into the parser cache if possible.
3570          * Updates templatelinks if it is out of date.
3571          *
3572          * @param $text String
3573          * @param $cache Boolean
3574          */
3575         public function outputWikiText( $text, $cache = true ) {
3576                 global $wgParser, $wgOut, $wgEnableParserCache, $wgUseFileCache;
3577
3578                 $popts = $wgOut->parserOptions();
3579                 $popts->setTidy(true);
3580                 $popts->enableLimitReport();
3581                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
3582                         $popts, true, true, $this->getRevIdFetched() );
3583                 $popts->setTidy(false);
3584                 $popts->enableLimitReport( false );
3585                 if( $wgEnableParserCache && $cache && $this && $parserOutput->getCacheTime() != -1 ) {
3586                         $parserCache = ParserCache::singleton();
3587                         $parserCache->save( $parserOutput, $this, $popts );
3588                 }
3589                 // Make sure file cache is not used on uncacheable content.
3590                 // Output that has magic words in it can still use the parser cache
3591                 // (if enabled), though it will generally expire sooner.
3592                 if( $parserOutput->getCacheTime() == -1 || $parserOutput->containsOldMagic() ) {
3593                         $wgUseFileCache = false;
3594                 }
3595
3596                 if( $this->isCurrent() && !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
3597                         // templatelinks table may have become out of sync,
3598                         // especially if using variable-based transclusions.
3599                         // For paranoia, check if things have changed and if
3600                         // so apply updates to the database. This will ensure
3601                         // that cascaded protections apply as soon as the changes
3602                         // are visible.
3603
3604                         # Get templates from templatelinks
3605                         $id = $this->mTitle->getArticleID();
3606
3607                         $tlTemplates = array();
3608
3609                         $dbr = wfGetDB( DB_SLAVE );
3610                         $res = $dbr->select( array( 'templatelinks' ),
3611                                 array( 'tl_namespace', 'tl_title' ),
3612                                 array( 'tl_from' => $id ),
3613                                 __METHOD__ );
3614
3615                         global $wgContLang;
3616                         foreach( $res as $row ) {
3617                                 $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3618                         }
3619
3620                         # Get templates from parser output.
3621                         $poTemplates = array();
3622                         foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3623                                 foreach ( $templates as $dbk => $id ) {
3624                                         $poTemplates["$ns:$dbk"] = true;
3625                                 }
3626                         }
3627
3628                         # Get the diff
3629                         # Note that we simulate array_diff_key in PHP <5.0.x
3630                         $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3631
3632                         if( count( $templates_diff ) > 0 ) {
3633                                 # Whee, link updates time.
3634                                 $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3635                                 $u->doUpdate();
3636                         }
3637                 }
3638
3639                 $wgOut->addParserOutput( $parserOutput );
3640         }
3641
3642         /**
3643          * Update all the appropriate counts in the category table, given that
3644          * we've added the categories $added and deleted the categories $deleted.
3645          *
3646          * @param $added array   The names of categories that were added
3647          * @param $deleted array The names of categories that were deleted
3648          * @return null
3649          */
3650         public function updateCategoryCounts( $added, $deleted ) {
3651                 $ns = $this->mTitle->getNamespace();
3652                 $dbw = wfGetDB( DB_MASTER );
3653
3654                 # First make sure the rows exist.  If one of the "deleted" ones didn't
3655                 # exist, we might legitimately not create it, but it's simpler to just
3656                 # create it and then give it a negative value, since the value is bogus
3657                 # anyway.
3658                 #
3659                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3660                 $insertCats = array_merge( $added, $deleted );
3661                 if( !$insertCats ) {
3662                         # Okay, nothing to do
3663                         return;
3664                 }
3665                 $insertRows = array();
3666                 foreach( $insertCats as $cat ) {
3667                         $insertRows[] = array( 'cat_title' => $cat );
3668                 }
3669                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
3670
3671                 $addFields    = array( 'cat_pages = cat_pages + 1' );
3672                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3673                 if( $ns == NS_CATEGORY ) {
3674                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
3675                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3676                 } elseif( $ns == NS_FILE ) {
3677                         $addFields[]    = 'cat_files = cat_files + 1';
3678                         $removeFields[] = 'cat_files = cat_files - 1';
3679                 }
3680
3681                 if( $added ) {
3682                         $dbw->update(
3683                                 'category',
3684                                 $addFields,
3685                                 array( 'cat_title' => $added ),
3686                                 __METHOD__
3687                         );
3688                 }
3689                 if( $deleted ) {
3690                         $dbw->update(
3691                                 'category',
3692                                 $removeFields,
3693                                 array( 'cat_title' => $deleted ),
3694                                 __METHOD__
3695                         );
3696                 }
3697         }
3698 }