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