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