includes/Article.php

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