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         /**@}}*/
  38
  39         /**
  40          * Constructor and clear the article
  41          * @param $title Reference to a Title object.
  42          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  43          */
  44         function __construct( &$title, $oldId = null ) {
  45                 $this->mTitle =& $title;
  46                 $this->mOldId = $oldId;
  47                 $this->clear();
  48         }
  49
  50         /**
  51          * Tell the page view functions that this view was redirected
  52          * from another page on the wiki.
  53          * @param $from Title object.
  54          */
  55         function setRedirectedFrom( $from ) {
  56                 $this->mRedirectedFrom = $from;
  57         }
  58
  59         /**
  60          * @return mixed false, Title of in-wiki target, or string with URL
  61          */
  62         function followRedirect() {
  63                 $text = $this->getContent();
  64                 $rt = Title::newFromRedirect( $text );
  65
  66                 # process if title object is valid and not special:userlogout
  67                 if( $rt ) {
  68                         if( $rt->getInterwiki() != '' ) {
  69                                 if( $rt->isLocal() ) {
  70                                         // Offsite wikis need an HTTP redirect.
  71                                         //
  72                                         // This can be hard to reverse and may produce loops,
  73                                         // so they may be disabled in the site configuration.
  74
  75                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  76                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  77                                 }
  78                         } else {
  79                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  80                                         // Gotta handle redirects to special pages differently:
  81                                         // Fill the HTTP response "Location" header and ignore
  82                                         // the rest of the page we're on.
  83                                         //
  84                                         // This can be hard to reverse, so they may be disabled.
  85
  86                                         if( $rt->isSpecial( 'Userlogout' ) ) {
  87                                                 // rolleyes
  88                                         } else {
  89                                                 return $rt->getFullURL();
  90                                         }
  91                                 }
  92                                 return $rt;
  93                         }
  94                 }
  95
  96                 // No or invalid redirect
  97                 return false;
  98         }
  99
 100         /**
 101          * get the title object of the article
 102          */
 103         function getTitle() {
 104                 return $this->mTitle;
 105         }
 106
 107         /**
 108           * Clear the object
 109           * @private
 110           */
 111         function clear() {
 112                 $this->mDataLoaded    = false;
 113                 $this->mContentLoaded = false;
 114
 115                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 116                 $this->mRedirectedFrom = null; # Title object if set
 117                 $this->mUserText =
 118                 $this->mTimestamp = $this->mComment = '';
 119                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 120                 $this->mTouched = '19700101000000';
 121                 $this->mForUpdate = false;
 122                 $this->mIsRedirect = false;
 123                 $this->mRevIdFetched = 0;
 124                 $this->mRedirectUrl = false;
 125                 $this->mLatest = false;
 126         }
 127
 128         /**
 129          * Note that getContent/loadContent do not follow redirects anymore.
 130          * If you need to fetch redirectable content easily, try
 131          * the shortcut in Article::followContent()
 132          * FIXME
 133          * @todo There are still side-effects in this!
 134          *        In general, you should use the Revision class, not Article,
 135          *        to fetch text for purposes other than page views.
 136          *
 137          * @return Return the text of this revision
 138         */
 139         function getContent() {
 140                 global $wgUser, $wgOut;
 141
 142                 wfProfileIn( __METHOD__ );
 143
 144                 if ( 0 == $this->getID() ) {
 145                         wfProfileOut( __METHOD__ );
 146                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 147
 148                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 149                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 150                         } else {
 151                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 152                         }
 153
 154                         return "<div class='noarticletext'>$ret</div>";
 155                 } else {
 156                         $this->loadContent();
 157                         wfProfileOut( __METHOD__ );
 158                         return $this->mContent;
 159                 }
 160         }
 161
 162         /**
 163          * This function returns the text of a section, specified by a number ($section).
 164          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 165          * the first section before any such heading (section 0).
 166          *
 167          * If a section contains subsections, these are also returned.
 168          *
 169          * @param $text String: text to look in
 170          * @param $section Integer: section number
 171          * @return string text of the requested section
 172          * @deprecated
 173          */
 174         function getSection($text,$section) {
 175                 global $wgParser;
 176                 return $wgParser->getSection( $text, $section );
 177         }
 178
 179         /**
 180          * @return int The oldid of the article that is to be shown, 0 for the
 181          *             current revision
 182          */
 183         function getOldID() {
 184                 if ( is_null( $this->mOldId ) ) {
 185                         $this->mOldId = $this->getOldIDFromRequest();
 186                 }
 187                 return $this->mOldId;
 188         }
 189
 190         /**
 191          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 192          *
 193          * @return int The old id for the request
 194          */
 195         function getOldIDFromRequest() {
 196                 global $wgRequest;
 197                 $this->mRedirectUrl = false;
 198                 $oldid = $wgRequest->getVal( 'oldid' );
 199                 if ( isset( $oldid ) ) {
 200                         $oldid = intval( $oldid );
 201                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 202                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 203                                 if ( $nextid  ) {
 204                                         $oldid = $nextid;
 205                                 } else {
 206                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 207                                 }
 208                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 209                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 210                                 if ( $previd ) {
 211                                         $oldid = $previd;
 212                                 } else {
 213                                         # TODO
 214                                 }
 215                         }
 216                         # unused:
 217                         # $lastid = $oldid;
 218                 }
 219
 220                 if ( !$oldid ) {
 221                         $oldid = 0;
 222                 }
 223                 return $oldid;
 224         }
 225
 226         /**
 227          * Load the revision (including text) into this object
 228          */
 229         function loadContent() {
 230                 if ( $this->mContentLoaded ) return;
 231
 232                 # Query variables :P
 233                 $oldid = $this->getOldID();
 234
 235                 # Pre-fill content with error message so that if something
 236                 # fails we'll have something telling us what we intended.
 237                 $this->mOldId = $oldid;
 238                 $this->fetchContent( $oldid );
 239         }
 240
 241
 242         /**
 243          * Fetch a page record with the given conditions
 244          * @param Database $dbr
 245          * @param array    $conditions
 246          * @private
 247          */
 248         function pageData( $dbr, $conditions ) {
 249                 $fields = array(
 250                                 'page_id',
 251                                 'page_namespace',
 252                                 'page_title',
 253                                 'page_restrictions',
 254                                 'page_counter',
 255                                 'page_is_redirect',
 256                                 'page_is_new',
 257                                 'page_random',
 258                                 'page_touched',
 259                                 'page_latest',
 260                                 'page_len' ) ;
 261                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 262                 $row = $dbr->selectRow( 'page',
 263                         $fields,
 264                         $conditions,
 265                         'Article::pageData' );
 266                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 267                 return $row ;
 268         }
 269
 270         /**
 271          * @param Database $dbr
 272          * @param Title $title
 273          */
 274         function pageDataFromTitle( $dbr, $title ) {
 275                 return $this->pageData( $dbr, array(
 276                         'page_namespace' => $title->getNamespace(),
 277                         'page_title'     => $title->getDBkey() ) );
 278         }
 279
 280         /**
 281          * @param Database $dbr
 282          * @param int $id
 283          */
 284         function pageDataFromId( $dbr, $id ) {
 285                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 286         }
 287
 288         /**
 289          * Set the general counter, title etc data loaded from
 290          * some source.
 291          *
 292          * @param object $data
 293          * @private
 294          */
 295         function loadPageData( $data = 'fromdb' ) {
 296                 if ( $data === 'fromdb' ) {
 297                         $dbr = $this->getDB();
 298                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 299                 }
 300
 301                 $lc =& LinkCache::singleton();
 302                 if ( $data ) {
 303                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 304
 305                         $this->mTitle->mArticleID = $data->page_id;
 306
 307                         # Old-fashioned restrictions.
 308                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 309
 310                         $this->mCounter     = $data->page_counter;
 311                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 312                         $this->mIsRedirect  = $data->page_is_redirect;
 313                         $this->mLatest      = $data->page_latest;
 314                 } else {
 315                         if ( is_object( $this->mTitle ) ) {
 316                                 $lc->addBadLinkObj( $this->mTitle );
 317                         }
 318                         $this->mTitle->mArticleID = 0;
 319                 }
 320
 321                 $this->mDataLoaded  = true;
 322         }
 323
 324         /**
 325          * Get text of an article from database
 326          * Does *NOT* follow redirects.
 327          * @param int $oldid 0 for whatever the latest revision is
 328          * @return string
 329          */
 330         function fetchContent( $oldid = 0 ) {
 331                 if ( $this->mContentLoaded ) {
 332                         return $this->mContent;
 333                 }
 334
 335                 $dbr = $this->getDB();
 336
 337                 # Pre-fill content with error message so that if something
 338                 # fails we'll have something telling us what we intended.
 339                 $t = $this->mTitle->getPrefixedText();
 340                 if( $oldid ) {
 341                         $t .= ',oldid='.$oldid;
 342                 }
 343                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 344
 345                 if( $oldid ) {
 346                         $revision = Revision::newFromId( $oldid );
 347                         if( is_null( $revision ) ) {
 348                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 349                                 return false;
 350                         }
 351                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 352                         if( !$data ) {
 353                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 354                                 return false;
 355                         }
 356                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 357                         $this->loadPageData( $data );
 358                 } else {
 359                         if( !$this->mDataLoaded ) {
 360                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 361                                 if( !$data ) {
 362                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 363                                         return false;
 364                                 }
 365                                 $this->loadPageData( $data );
 366                         }
 367                         $revision = Revision::newFromId( $this->mLatest );
 368                         if( is_null( $revision ) ) {
 369                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 370                                 return false;
 371                         }
 372                 }
 373
 374                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 375                 // We should instead work with the Revision object when we need it...
 376                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 377                 //$this->mContent   = $revision->getText();
 378
 379                 $this->mUser      = $revision->getUser();
 380                 $this->mUserText  = $revision->getUserText();
 381                 $this->mComment   = $revision->getComment();
 382                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 383
 384                 $this->mRevIdFetched = $revision->getID();
 385                 $this->mContentLoaded = true;
 386                 $this->mRevision =& $revision;
 387
 388                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 389
 390                 return $this->mContent;
 391         }
 392
 393         /**
 394          * Read/write accessor to select FOR UPDATE
 395          *
 396          * @param $x Mixed: FIXME
 397          */
 398         function forUpdate( $x = NULL ) {
 399                 return wfSetVar( $this->mForUpdate, $x );
 400         }
 401
 402         /**
 403          * Get the database which should be used for reads
 404          *
 405          * @return Database
 406          */
 407         function getDB() {
 408                 return wfGetDB( DB_MASTER );
 409         }
 410
 411         /**
 412          * Get options for all SELECT statements
 413          *
 414          * @param $options Array: an optional options array which'll be appended to
 415          *                       the default
 416          * @return Array: options
 417          */
 418         function getSelectOptions( $options = '' ) {
 419                 if ( $this->mForUpdate ) {
 420                         if ( is_array( $options ) ) {
 421                                 $options[] = 'FOR UPDATE';
 422                         } else {
 423                                 $options = 'FOR UPDATE';
 424                         }
 425                 }
 426                 return $options;
 427         }
 428
 429         /**
 430          * @return int Page ID
 431          */
 432         function getID() {
 433                 if( $this->mTitle ) {
 434                         return $this->mTitle->getArticleID();
 435                 } else {
 436                         return 0;
 437                 }
 438         }
 439
 440         /**
 441          * @return bool Whether or not the page exists in the database
 442          */
 443         function exists() {
 444                 return $this->getId() != 0;
 445         }
 446
 447         /**
 448          * @return int The view count for the page
 449          */
 450         function getCount() {
 451                 if ( -1 == $this->mCounter ) {
 452                         $id = $this->getID();
 453                         if ( $id == 0 ) {
 454                                 $this->mCounter = 0;
 455                         } else {
 456                                 $dbr = wfGetDB( DB_SLAVE );
 457                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 458                                         'Article::getCount', $this->getSelectOptions() );
 459                         }
 460                 }
 461                 return $this->mCounter;
 462         }
 463
 464         /**
 465          * Determine whether a page  would be suitable for being counted as an
 466          * article in the site_stats table based on the title & its content
 467          *
 468          * @param $text String: text to analyze
 469          * @return bool
 470          */
 471         function isCountable( $text ) {
 472                 global $wgUseCommaCount;
 473
 474                 $token = $wgUseCommaCount ? ',' : '[[';
 475                 return
 476                         $this->mTitle->isContentPage()
 477                         && !$this->isRedirect( $text )
 478                         && in_string( $token, $text );
 479         }
 480
 481         /**
 482          * Tests if the article text represents a redirect
 483          *
 484          * @param $text String: FIXME
 485          * @return bool
 486          */
 487         function isRedirect( $text = false ) {
 488                 if ( $text === false ) {
 489                         $this->loadContent();
 490                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 491                 } else {
 492                         $titleObj = Title::newFromRedirect( $text );
 493                 }
 494                 return $titleObj !== NULL;
 495         }
 496
 497         /**
 498          * Returns true if the currently-referenced revision is the current edit
 499          * to this page (and it exists).
 500          * @return bool
 501          */
 502         function isCurrent() {
 503                 # If no oldid, this is the current version.
 504                 if ($this->getOldID() == 0)
 505                         return true;
 506
 507                 return $this->exists() &&
 508                         isset( $this->mRevision ) &&
 509                         $this->mRevision->isCurrent();
 510         }
 511
 512         /**
 513          * Loads everything except the text
 514          * This isn't necessary for all uses, so it's only done if needed.
 515          * @private
 516          */
 517         function loadLastEdit() {
 518                 if ( -1 != $this->mUser )
 519                         return;
 520
 521                 # New or non-existent articles have no user information
 522                 $id = $this->getID();
 523                 if ( 0 == $id ) return;
 524
 525                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 526                 if( !is_null( $this->mLastRevision ) ) {
 527                         $this->mUser      = $this->mLastRevision->getUser();
 528                         $this->mUserText  = $this->mLastRevision->getUserText();
 529                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 530                         $this->mComment   = $this->mLastRevision->getComment();
 531                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 532                         $this->mRevIdFetched = $this->mLastRevision->getID();
 533                 }
 534         }
 535
 536         function getTimestamp() {
 537                 // Check if the field has been filled by ParserCache::get()
 538                 if ( !$this->mTimestamp ) {
 539                         $this->loadLastEdit();
 540                 }
 541                 return wfTimestamp(TS_MW, $this->mTimestamp);
 542         }
 543
 544         function getUser() {
 545                 $this->loadLastEdit();
 546                 return $this->mUser;
 547         }
 548
 549         function getUserText() {
 550                 $this->loadLastEdit();
 551                 return $this->mUserText;
 552         }
 553
 554         function getComment() {
 555                 $this->loadLastEdit();
 556                 return $this->mComment;
 557         }
 558
 559         function getMinorEdit() {
 560                 $this->loadLastEdit();
 561                 return $this->mMinorEdit;
 562         }
 563
 564         function getRevIdFetched() {
 565                 $this->loadLastEdit();
 566                 return $this->mRevIdFetched;
 567         }
 568
 569         /**
 570          * @todo Document, fixme $offset never used.
 571          * @param $limit Integer: default 0.
 572          * @param $offset Integer: default 0.
 573          */
 574         function getContributors($limit = 0, $offset = 0) {
 575                 # XXX: this is expensive; cache this info somewhere.
 576
 577                 $contribs = array();
 578                 $dbr = wfGetDB( DB_SLAVE );
 579                 $revTable = $dbr->tableName( 'revision' );
 580                 $userTable = $dbr->tableName( 'user' );
 581                 $user = $this->getUser();
 582                 $pageId = $this->getId();
 583
 584                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 585                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 586                         WHERE rev_page = $pageId
 587                         AND rev_user != $user
 588                         GROUP BY rev_user, rev_user_text, user_real_name
 589                         ORDER BY timestamp DESC";
 590
 591                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 592                 $sql .= ' '. $this->getSelectOptions();
 593
 594                 $res = $dbr->query($sql, __METHOD__);
 595
 596                 while ( $line = $dbr->fetchObject( $res ) ) {
 597                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 598                 }
 599
 600                 $dbr->freeResult($res);
 601                 return $contribs;
 602         }
 603
 604         /**
 605          * This is the default action of the script: just view the page of
 606          * the given title.
 607         */
 608         function view() {
 609                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 610                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 611                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 612                 $sk = $wgUser->getSkin();
 613
 614                 wfProfileIn( __METHOD__ );
 615
 616                 $parserCache =& ParserCache::singleton();
 617                 $ns = $this->mTitle->getNamespace(); # shortcut
 618
 619                 # Get variables from query string
 620                 $oldid = $this->getOldID();
 621
 622                 # getOldID may want us to redirect somewhere else
 623                 if ( $this->mRedirectUrl ) {
 624                         $wgOut->redirect( $this->mRedirectUrl );
 625                         wfProfileOut( __METHOD__ );
 626                         return;
 627                 }
 628
 629                 $diff = $wgRequest->getVal( 'diff' );
 630                 $rcid = $wgRequest->getVal( 'rcid' );
 631                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 632                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 633
 634                 $wgOut->setArticleFlag( true );
 635
 636                 # Discourage indexing of printable versions, but encourage following
 637                 if( $wgOut->isPrintable() ) {
 638                         $policy = 'noindex,follow';
 639                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 640                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 641                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 642                         # Honour customised robot policies for this namespace
 643                         $policy = $wgNamespaceRobotPolicies[$ns];
 644                 } elseif ( $this->mTitle->getRestrictions( 'robots' ) ) {
 645                         $policy = implode( ',', $this->mTitle->getRestrictions( 'robots' ) );
 646                 } else {
 647                         # Default to encourage indexing and following links
 648                         $policy = 'index,follow';
 649                 }
 650                 $wgOut->setRobotPolicy( $policy );
 651
 652                 # If we got diff and oldid in the query, we want to see a
 653                 # diff page instead of the article.
 654
 655                 if ( !is_null( $diff ) ) {
 656                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 657
 658                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 659                         // DifferenceEngine directly fetched the revision:
 660                         $this->mRevIdFetched = $de->mNewid;
 661                         $de->showDiffPage( $diffOnly );
 662
 663                         // Needed to get the page's current revision
 664                         $this->loadPageData();
 665                         if( $diff == 0 || $diff == $this->mLatest ) {
 666                                 # Run view updates for current revision only
 667                                 $this->viewUpdates();
 668                         }
 669                         wfProfileOut( __METHOD__ );
 670                         return;
 671                 }
 672
 673                 if ( empty( $oldid ) && $this->checkTouched() ) {
 674                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 675
 676                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 677                                 wfProfileOut( __METHOD__ );
 678                                 return;
 679                         } else if ( $this->tryFileCache() ) {
 680                                 # tell wgOut that output is taken care of
 681                                 $wgOut->disable();
 682                                 $this->viewUpdates();
 683                                 wfProfileOut( __METHOD__ );
 684                                 return;
 685                         }
 686                 }
 687
 688                 # Should the parser cache be used?
 689                 $pcache = $wgEnableParserCache &&
 690                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 691                         $this->exists() &&
 692                         empty( $oldid );
 693                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 694                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 695                         wfIncrStats( 'pcache_miss_stub' );
 696                 }
 697
 698                 $wasRedirected = false;
 699                 if ( isset( $this->mRedirectedFrom ) ) {
 700                         // This is an internally redirected page view.
 701                         // We'll need a backlink to the source page for navigation.
 702                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 703                                 $sk = $wgUser->getSkin();
 704                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 705                                 $s = wfMsg( 'redirectedfrom', $redir );
 706                                 $wgOut->setSubtitle( $s );
 707
 708                                 // Set the fragment if one was specified in the redirect
 709                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 710                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 711                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 712                                 }
 713                                 $wasRedirected = true;
 714                         }
 715                 } elseif ( !empty( $rdfrom ) ) {
 716                         // This is an externally redirected view, from some other wiki.
 717                         // If it was reported from a trusted site, supply a backlink.
 718                         global $wgRedirectSources;
 719                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 720                                 $sk = $wgUser->getSkin();
 721                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 722                                 $s = wfMsg( 'redirectedfrom', $redir );
 723                                 $wgOut->setSubtitle( $s );
 724                                 $wasRedirected = true;
 725                         }
 726                 }
 727
 728                 $outputDone = false;
 729                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 730                 if ( $pcache ) {
 731                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 732                                 // Ensure that UI elements requiring revision ID have
 733                                 // the correct version information.
 734                                 $wgOut->setRevisionId( $this->mLatest );
 735                                 $outputDone = true;
 736                         }
 737                 }
 738                 if ( !$outputDone ) {
 739                         $text = $this->getContent();
 740                         if ( $text === false ) {
 741                                 # Failed to load, replace text with error message
 742                                 $t = $this->mTitle->getPrefixedText();
 743                                 if( $oldid ) {
 744                                         $t .= ',oldid='.$oldid;
 745                                         $text = wfMsg( 'missingarticle', $t );
 746                                 } else {
 747                                         $text = wfMsg( 'noarticletext', $t );
 748                                 }
 749                         }
 750
 751                         # Another whitelist check in case oldid is altering the title
 752                         if ( !$this->mTitle->userCanRead() ) {
 753                                 $wgOut->loginToUse();
 754                                 $wgOut->output();
 755                                 exit;
 756                         }
 757
 758                         # We're looking at an old revision
 759
 760                         if ( !empty( $oldid ) ) {
 761                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 762                                 if( is_null( $this->mRevision ) ) {
 763                                         // FIXME: This would be a nice place to load the 'no such page' text.
 764                                 } else {
 765                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 766                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 767                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 768                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 769                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 770                                                         return;
 771                                                 } else {
 772                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 773                                                         // and we are allowed to see...
 774                                                 }
 775                                         }
 776                                 }
 777
 778                         }
 779                 }
 780                 if( !$outputDone ) {
 781                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 782                         # wrap user css and user js in pre and don't parse
 783                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 784                         if (
 785                                 $ns == NS_USER &&
 786                                 preg_match('!/[\w]+\.(css|js)$!', $this->mTitle->getDBkey(), $matches)
 787                         ) {
 788                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 789                                 $wgOut->addHTML( "<pre class=\"mw-user-{$matches[1]}\" dir=\"ltr\">".htmlspecialchars($this->mContent)."\n</pre>" );
 790                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 791                                 # Display redirect
 792                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 793                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 794                                 # Don't overwrite the subtitle if this was an old revision
 795                                 if( !$wasRedirected && $this->isCurrent() ) {
 796                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 797                                 }
 798                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 799
 800                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 801                                   '<span class="redirectText">'.$link.'</span>' );
 802
 803                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 804                                 $wgOut->addParserOutputNoText( $parseout );
 805                         } else if ( $pcache ) {
 806                                 # Display content and save to parser cache
 807                                 $this->outputWikiText( $text );
 808                         } else {
 809                                 # Display content, don't attempt to save to parser cache
 810                                 # Don't show section-edit links on old revisions... this way lies madness.
 811                                 if( !$this->isCurrent() ) {
 812                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 813                                 }
 814                                 # Display content and don't save to parser cache
 815                                 # With timing hack -- TS 2006-07-26
 816                                 $time = -wfTime();
 817                                 $this->outputWikiText( $text, false );
 818                                 $time += wfTime();
 819
 820                                 # Timing hack
 821                                 if ( $time > 3 ) {
 822                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 823                                                 $this->mTitle->getPrefixedDBkey()));
 824                                 }
 825
 826                                 if( !$this->isCurrent() ) {
 827                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 828                                 }
 829
 830                         }
 831                 }
 832                 /* title may have been set from the cache */
 833                 $t = $wgOut->getPageTitle();
 834                 if( empty( $t ) ) {
 835                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 836                 }
 837
 838                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 839                 if( $ns == NS_USER_TALK &&
 840                         User::isIP( $this->mTitle->getText() ) ) {
 841                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 842                 }
 843
 844                 # If we have been passed an &rcid= parameter, we want to give the user a
 845                 # chance to mark this new article as patrolled.
 846                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 847                         $wgOut->addHTML(
 848                                 "<div class='patrollink'>" .
 849                                         wfMsgHtml( 'markaspatrolledlink',
 850                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 851                                                 "action=markpatrolled&rcid=$rcid" )
 852                                         ) .
 853                                 '</div>'
 854                          );
 855                 }
 856
 857                 # Trackbacks
 858                 if ($wgUseTrackbacks)
 859                         $this->addTrackbacks();
 860
 861                 $this->viewUpdates();
 862                 wfProfileOut( __METHOD__ );
 863         }
 864
 865         function addTrackbacks() {
 866                 global $wgOut, $wgUser;
 867
 868                 $dbr = wfGetDB(DB_SLAVE);
 869                 $tbs = $dbr->select(
 870                                 /* FROM   */ 'trackbacks',
 871                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 872                                 /* WHERE  */ array('tb_page' => $this->getID())
 873                 );
 874
 875                 if (!$dbr->numrows($tbs))
 876                         return;
 877
 878                 $tbtext = "";
 879                 while ($o = $dbr->fetchObject($tbs)) {
 880                         $rmvtxt = "";
 881                         if ($wgUser->isAllowed( 'trackback' )) {
 882                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 883                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 884                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 885                         }
 886                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 887                                         $o->tb_title,
 888                                         $o->tb_url,
 889                                         $o->tb_ex,
 890                                         $o->tb_name,
 891                                         $rmvtxt);
 892                 }
 893                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 894         }
 895
 896         function deletetrackback() {
 897                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 898
 899                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 900                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 901                         return;
 902                 }
 903
 904                 if ((!$wgUser->isAllowed('delete'))) {
 905                         $wgOut->permissionRequired( 'delete' );
 906                         return;
 907                 }
 908
 909                 if (wfReadOnly()) {
 910                         $wgOut->readOnlyPage();
 911                         return;
 912                 }
 913
 914                 $db = wfGetDB(DB_MASTER);
 915                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 916                 $wgTitle->invalidateCache();
 917                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 918         }
 919
 920         function render() {
 921                 global $wgOut;
 922
 923                 $wgOut->setArticleBodyOnly(true);
 924                 $this->view();
 925         }
 926
 927         /**
 928          * Handle action=purge
 929          */
 930         function purge() {
 931                 global $wgUser, $wgRequest, $wgOut;
 932
 933                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 934                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 935                                 $this->doPurge();
 936                         }
 937                 } else {
 938                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 939                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 940                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 941                         $msg = str_replace( '$1',
 942                                 "<form method=\"post\" action=\"$action\">\n" .
 943                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 944                                 "</form>\n", $msg );
 945
 946                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 947                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 948                         $wgOut->addHTML( $msg );
 949                 }
 950         }
 951
 952         /**
 953          * Perform the actions of a page purging
 954          */
 955         function doPurge() {
 956                 global $wgUseSquid;
 957                 // Invalidate the cache
 958                 $this->mTitle->invalidateCache();
 959
 960                 if ( $wgUseSquid ) {
 961                         // Commit the transaction before the purge is sent
 962                         $dbw = wfGetDB( DB_MASTER );
 963                         $dbw->immediateCommit();
 964
 965                         // Send purge
 966                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 967                         $update->doUpdate();
 968                 }
 969                 $this->view();
 970         }
 971
 972         /**
 973          * Insert a new empty page record for this article.
 974          * This *must* be followed up by creating a revision
 975          * and running $this->updateToLatest( $rev_id );
 976          * or else the record will be left in a funky state.
 977          * Best if all done inside a transaction.
 978          *
 979          * @param Database $dbw
 980          * @return int     The newly created page_id key
 981          * @private
 982          */
 983         function insertOn( $dbw ) {
 984                 wfProfileIn( __METHOD__ );
 985
 986                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 987                 $dbw->insert( 'page', array(
 988                         'page_id'           => $page_id,
 989                         'page_namespace'    => $this->mTitle->getNamespace(),
 990                         'page_title'        => $this->mTitle->getDBkey(),
 991                         'page_counter'      => 0,
 992                         'page_restrictions' => '',
 993                         'page_is_redirect'  => 0, # Will set this shortly...
 994                         'page_is_new'       => 1,
 995                         'page_random'       => wfRandom(),
 996                         'page_touched'      => $dbw->timestamp(),
 997                         'page_latest'       => 0, # Fill this in shortly...
 998                         'page_len'          => 0, # Fill this in shortly...
 999                 ), __METHOD__ );
1000                 $newid = $dbw->insertId();
1001
1002                 $this->mTitle->resetArticleId( $newid );
1003
1004                 wfProfileOut( __METHOD__ );
1005                 return $newid;
1006         }
1007
1008         /**
1009          * Update the page record to point to a newly saved revision.
1010          *
1011          * @param Database $dbw
1012          * @param Revision $revision For ID number, and text used to set
1013                                      length and redirect status fields
1014          * @param int $lastRevision If given, will not overwrite the page field
1015          *                          when different from the currently set value.
1016          *                          Giving 0 indicates the new page flag should
1017          *                          be set on.
1018          * @param bool $lastRevIsRedirect If given, will optimize adding and
1019          *                                                      removing rows in redirect table.
1020          * @return bool true on success, false on failure
1021          * @private
1022          */
1023         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1024                 wfProfileIn( __METHOD__ );
1025
1026                 $text = $revision->getText();
1027                 $rt = Title::newFromRedirect( $text );
1028
1029                 $conditions = array( 'page_id' => $this->getId() );
1030                 if( !is_null( $lastRevision ) ) {
1031                         # An extra check against threads stepping on each other
1032                         $conditions['page_latest'] = $lastRevision;
1033                 }
1034
1035                 $dbw->update( 'page',
1036                         array( /* SET */
1037                                 'page_latest'      => $revision->getId(),
1038                                 'page_touched'     => $dbw->timestamp(),
1039                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1040                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1041                                 'page_len'         => strlen( $text ),
1042                         ),
1043                         $conditions,
1044                         __METHOD__ );
1045
1046                 $result = $dbw->affectedRows() != 0;
1047
1048                 if ($result) {
1049                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1050                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1051                 }
1052
1053                 wfProfileOut( __METHOD__ );
1054                 return $result;
1055         }
1056
1057         /**
1058          * Add row to the redirect table if this is a redirect, remove otherwise.
1059          *
1060          * @param Database $dbw
1061          * @param $redirectTitle a title object pointing to the redirect target,
1062          *                                                      or NULL if this is not a redirect
1063          * @param bool $lastRevIsRedirect If given, will optimize adding and
1064          *                                                      removing rows in redirect table.
1065          * @return bool true on success, false on failure
1066          * @private
1067          */
1068         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1069
1070                 // Always update redirects (target link might have changed)
1071                 // Update/Insert if we don't know if the last revision was a redirect or not
1072                 // Delete if changing from redirect to non-redirect
1073                 $isRedirect = !is_null($redirectTitle);
1074                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1075
1076                         wfProfileIn( __METHOD__ );
1077
1078                         if ($isRedirect) {
1079
1080                                 // This title is a redirect, Add/Update row in the redirect table
1081                                 $set = array( /* SET */
1082                                         'rd_namespace' => $redirectTitle->getNamespace(),
1083                                         'rd_title'     => $redirectTitle->getDBkey(),
1084                                         'rd_from'      => $this->getId(),
1085                                 );
1086
1087                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1088                         } else {
1089                                 // This is not a redirect, remove row from redirect table
1090                                 $where = array( 'rd_from' => $this->getId() );
1091                                 $dbw->delete( 'redirect', $where, __METHOD__);
1092                         }
1093
1094                         wfProfileOut( __METHOD__ );
1095                         return ( $dbw->affectedRows() != 0 );
1096                 }
1097
1098                 return true;
1099         }
1100
1101         /**
1102          * If the given revision is newer than the currently set page_latest,
1103          * update the page record. Otherwise, do nothing.
1104          *
1105          * @param Database $dbw
1106          * @param Revision $revision
1107          */
1108         function updateIfNewerOn( &$dbw, $revision ) {
1109                 wfProfileIn( __METHOD__ );
1110
1111                 $row = $dbw->selectRow(
1112                         array( 'revision', 'page' ),
1113                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1114                         array(
1115                                 'page_id' => $this->getId(),
1116                                 'page_latest=rev_id' ),
1117                         __METHOD__ );
1118                 if( $row ) {
1119                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1120                                 wfProfileOut( __METHOD__ );
1121                                 return false;
1122                         }
1123                         $prev = $row->rev_id;
1124                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1125                 } else {
1126                         # No or missing previous revision; mark the page as new
1127                         $prev = 0;
1128                         $lastRevIsRedirect = null;
1129                 }
1130
1131                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1132                 wfProfileOut( __METHOD__ );
1133                 return $ret;
1134         }
1135
1136         /**
1137          * @return string Complete article text, or null if error
1138          */
1139         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1140                 wfProfileIn( __METHOD__ );
1141
1142                 if( $section == '' ) {
1143                         // Whole-page edit; let the text through unmolested.
1144                 } else {
1145                         if( is_null( $edittime ) ) {
1146                                 $rev = Revision::newFromTitle( $this->mTitle );
1147                         } else {
1148                                 $dbw = wfGetDB( DB_MASTER );
1149                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1150                         }
1151                         if( is_null( $rev ) ) {
1152                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1153                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1154                                 return null;
1155                         }
1156                         $oldtext = $rev->getText();
1157
1158                         if( $section == 'new' ) {
1159                                 # Inserting a new section
1160                                 $subject = $summary ? "== {$summary} ==\n\n" : '';
1161                                 $text = strlen( trim( $oldtext ) ) > 0
1162                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1163                                                 : "{$subject}{$text}";
1164                         } else {
1165                                 # Replacing an existing section; roll out the big guns
1166                                 global $wgParser;
1167                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1168                         }
1169
1170                 }
1171
1172                 wfProfileOut( __METHOD__ );
1173                 return $text;
1174         }
1175
1176         /**
1177          * @deprecated use Article::doEdit()
1178          */
1179         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1180                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1181                         ( $isminor ? EDIT_MINOR : 0 ) |
1182                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1183
1184                 # If this is a comment, add the summary as headline
1185                 if ( $comment && $summary != "" ) {
1186                         $text = "== {$summary} ==\n\n".$text;
1187                 }
1188
1189                 $this->doEdit( $text, $summary, $flags );
1190
1191                 $dbw = wfGetDB( DB_MASTER );
1192                 if ($watchthis) {
1193                         if (!$this->mTitle->userIsWatching()) {
1194                                 $dbw->begin();
1195                                 $this->doWatch();
1196                                 $dbw->commit();
1197                         }
1198                 } else {
1199                         if ( $this->mTitle->userIsWatching() ) {
1200                                 $dbw->begin();
1201                                 $this->doUnwatch();
1202                                 $dbw->commit();
1203                         }
1204                 }
1205                 $this->doRedirect( $this->isRedirect( $text ) );
1206         }
1207
1208         /**
1209          * @deprecated use Article::doEdit()
1210          */
1211         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1212                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1213                         ( $minor ? EDIT_MINOR : 0 ) |
1214                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1215
1216                 $good = $this->doEdit( $text, $summary, $flags );
1217                 if ( $good ) {
1218                         $dbw = wfGetDB( DB_MASTER );
1219                         if ($watchthis) {
1220                                 if (!$this->mTitle->userIsWatching()) {
1221                                         $dbw->begin();
1222                                         $this->doWatch();
1223                                         $dbw->commit();
1224                                 }
1225                         } else {
1226                                 if ( $this->mTitle->userIsWatching() ) {
1227                                         $dbw->begin();
1228                                         $this->doUnwatch();
1229                                         $dbw->commit();
1230                                 }
1231                         }
1232
1233                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1234                 }
1235                 return $good;
1236         }
1237
1238         /**
1239          * Article::doEdit()
1240          *
1241          * Change an existing article or create a new article. Updates RC and all necessary caches,
1242          * optionally via the deferred update array.
1243          *
1244          * $wgUser must be set before calling this function.
1245          *
1246          * @param string $text New text
1247          * @param string $summary Edit summary
1248          * @param integer $flags bitfield:
1249          *      EDIT_NEW
1250          *          Article is known or assumed to be non-existent, create a new one
1251          *      EDIT_UPDATE
1252          *          Article is known or assumed to be pre-existing, update it
1253          *      EDIT_MINOR
1254          *          Mark this edit minor, if the user is allowed to do so
1255          *      EDIT_SUPPRESS_RC
1256          *          Do not log the change in recentchanges
1257          *      EDIT_FORCE_BOT
1258          *          Mark the edit a "bot" edit regardless of user rights
1259          *      EDIT_DEFER_UPDATES
1260          *          Defer some of the updates until the end of index.php
1261          *      EDIT_AUTOSUMMARY
1262          *          Fill in blank summaries with generated text where possible
1263          *
1264          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1265          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1266          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1267          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1268          * to MediaWiki's performance-optimised locking strategy.
1269          *
1270          * @return bool success
1271          */
1272         function doEdit( $text, $summary, $flags = 0 ) {
1273                 global $wgUser, $wgDBtransactions;
1274
1275                 wfProfileIn( __METHOD__ );
1276                 $good = true;
1277
1278                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1279                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1280                         if ( $aid ) {
1281                                 $flags |= EDIT_UPDATE;
1282                         } else {
1283                                 $flags |= EDIT_NEW;
1284                         }
1285                 }
1286
1287                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1288                         &$summary, $flags & EDIT_MINOR,
1289                         null, null, &$flags ) ) )
1290                 {
1291                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1292                         wfProfileOut( __METHOD__ );
1293                         return false;
1294                 }
1295
1296                 # Silently ignore EDIT_MINOR if not allowed
1297                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1298                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1299
1300                 $oldtext = $this->getContent();
1301                 $oldsize = strlen( $oldtext );
1302
1303                 # Provide autosummaries if one is not provided.
1304                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1305                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1306
1307                 $text = $this->preSaveTransform( $text );
1308                 $newsize = strlen( $text );
1309
1310                 $dbw = wfGetDB( DB_MASTER );
1311                 $now = wfTimestampNow();
1312
1313                 if ( $flags & EDIT_UPDATE ) {
1314                         # Update article, but only if changed.
1315
1316                         # Make sure the revision is either completely inserted or not inserted at all
1317                         if( !$wgDBtransactions ) {
1318                                 $userAbort = ignore_user_abort( true );
1319                         }
1320
1321                         $lastRevision = 0;
1322                         $revisionId = 0;
1323
1324                         if ( 0 != strcmp( $text, $oldtext ) ) {
1325                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1326                                   - (int)$this->isCountable( $oldtext );
1327                                 $this->mTotalAdjustment = 0;
1328
1329                                 $lastRevision = $dbw->selectField(
1330                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1331
1332                                 if ( !$lastRevision ) {
1333                                         # Article gone missing
1334                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1335                                         wfProfileOut( __METHOD__ );
1336                                         return false;
1337                                 }
1338
1339                                 $revision = new Revision( array(
1340                                         'page'       => $this->getId(),
1341                                         'comment'    => $summary,
1342                                         'minor_edit' => $isminor,
1343                                         'text'       => $text
1344                                         ) );
1345
1346                                 $dbw->begin();
1347                                 $revisionId = $revision->insertOn( $dbw );
1348
1349                                 # Update page
1350                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1351
1352                                 if( !$ok ) {
1353                                         /* Belated edit conflict! Run away!! */
1354                                         $good = false;
1355                                         $dbw->rollback();
1356                                 } else {
1357                                         # Update recentchanges
1358                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1359                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1360                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1361                                                         $revisionId );
1362
1363                                                 # Mark as patrolled if the user can do so
1364                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1365                                                         RecentChange::markPatrolled( $rcid );
1366                                                         PatrolLog::record( $rcid, true );
1367                                                 }
1368                                         }
1369                                         $wgUser->incEditCount();
1370                                         $dbw->commit();
1371                                 }
1372                         } else {
1373                                 // Keep the same revision ID, but do some updates on it
1374                                 $revisionId = $this->getRevIdFetched();
1375                                 // Update page_touched, this is usually implicit in the page update
1376                                 // Other cache updates are done in onArticleEdit()
1377                                 $this->mTitle->invalidateCache();
1378                         }
1379
1380                         if( !$wgDBtransactions ) {
1381                                 ignore_user_abort( $userAbort );
1382                         }
1383
1384                         if ( $good ) {
1385                                 # Invalidate cache of this article and all pages using this article
1386                                 # as a template. Partly deferred.
1387                                 Article::onArticleEdit( $this->mTitle );
1388
1389                                 # Update links tables, site stats, etc.
1390                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1391                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1392                         }
1393                 } else {
1394                         # Create new article
1395
1396                         # Set statistics members
1397                         # We work out if it's countable after PST to avoid counter drift
1398                         # when articles are created with {{subst:}}
1399                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1400                         $this->mTotalAdjustment = 1;
1401
1402                         $dbw->begin();
1403
1404                         # Add the page record; stake our claim on this title!
1405                         # This will fail with a database query exception if the article already exists
1406                         $newid = $this->insertOn( $dbw );
1407
1408                         # Save the revision text...
1409                         $revision = new Revision( array(
1410                                 'page'       => $newid,
1411                                 'comment'    => $summary,
1412                                 'minor_edit' => $isminor,
1413                                 'text'       => $text
1414                                 ) );
1415                         $revisionId = $revision->insertOn( $dbw );
1416
1417                         $this->mTitle->resetArticleID( $newid );
1418
1419                         # Update the page record with revision data
1420                         $this->updateRevisionOn( $dbw, $revision, 0 );
1421
1422                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1423                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1424                                   '', strlen( $text ), $revisionId );
1425                                 # Mark as patrolled if the user can
1426                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1427                                         RecentChange::markPatrolled( $rcid );
1428                                         PatrolLog::record( $rcid, true );
1429                                 }
1430                         }
1431                         $wgUser->incEditCount();
1432                         $dbw->commit();
1433
1434                         # Update links, etc.
1435                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1436
1437                         # Clear caches
1438                         Article::onArticleCreate( $this->mTitle );
1439
1440                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1441                                 $summary, $flags & EDIT_MINOR,
1442                                 null, null, &$flags ) );
1443                 }
1444
1445                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1446                         wfDoUpdates();
1447                 }
1448
1449                 wfRunHooks( 'ArticleSaveComplete',
1450                         array( &$this, &$wgUser, $text,
1451                         $summary, $flags & EDIT_MINOR,
1452                         null, null, &$flags ) );
1453
1454                 wfProfileOut( __METHOD__ );
1455                 return $good;
1456         }
1457
1458         /**
1459          * @deprecated wrapper for doRedirect
1460          */
1461         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1462                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1463         }
1464
1465         /**
1466          * Output a redirect back to the article.
1467          * This is typically used after an edit.
1468          *
1469          * @param boolean $noRedir Add redirect=no
1470          * @param string $sectionAnchor section to redirect to, including "#"
1471          */
1472         function doRedirect( $noRedir = false, $sectionAnchor = '' ) {
1473                 global $wgOut;
1474                 if ( $noRedir ) {
1475                         $query = 'redirect=no';
1476                 } else {
1477                         $query = '';
1478                 }
1479                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1480         }
1481
1482         /**
1483          * Mark this particular edit as patrolled
1484          */
1485         function markpatrolled() {
1486                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1487                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1488
1489                 # Check RC patrol config. option
1490                 if( !$wgUseRCPatrol ) {
1491                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1492                         return;
1493                 }
1494
1495                 # Check permissions
1496                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1497                         $wgOut->permissionRequired( 'patrol' );
1498                         return;
1499                 }
1500
1501                 # If we haven't been given an rc_id value, we can't do anything
1502                 $rcid = $wgRequest->getVal( 'rcid' );
1503                 if( !$rcid ) {
1504                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1505                         return;
1506                 }
1507
1508                 # Handle the 'MarkPatrolled' hook
1509                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1510                         return;
1511                 }
1512
1513                 $return = SpecialPage::getTitleFor( 'Recentchanges' );
1514                 # If it's left up to us, check that the user is allowed to patrol this edit
1515                 # If the user has the "autopatrol" right, then we'll assume there are no
1516                 # other conditions stopping them doing so
1517                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1518                         $rc = RecentChange::newFromId( $rcid );
1519                         # Graceful error handling, as we've done before here...
1520                         # (If the recent change doesn't exist, then it doesn't matter whether
1521                         # the user is allowed to patrol it or not; nothing is going to happen
1522                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1523                                 # The user made this edit, and can't patrol it
1524                                 # Tell them so, and then back off
1525                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1526                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1527                                 $wgOut->returnToMain( false, $return );
1528                                 return;
1529                         }
1530                 }
1531
1532                 # Mark the edit as patrolled
1533                 RecentChange::markPatrolled( $rcid );
1534                 PatrolLog::record( $rcid );
1535                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1536
1537                 # Inform the user
1538                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1539                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1540                 $wgOut->returnToMain( false, $return );
1541         }
1542
1543         /**
1544          * User-interface handler for the "watch" action
1545          */
1546
1547         function watch() {
1548
1549                 global $wgUser, $wgOut;
1550
1551                 if ( $wgUser->isAnon() ) {
1552                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1553                         return;
1554                 }
1555                 if ( wfReadOnly() ) {
1556                         $wgOut->readOnlyPage();
1557                         return;
1558                 }
1559
1560                 if( $this->doWatch() ) {
1561                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1562                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1563
1564                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1565                         $text = wfMsg( 'addedwatchtext', $link );
1566                         $wgOut->addWikiText( $text );
1567                 }
1568
1569                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1570         }
1571
1572         /**
1573          * Add this page to $wgUser's watchlist
1574          * @return bool true on successful watch operation
1575          */
1576         function doWatch() {
1577                 global $wgUser;
1578                 if( $wgUser->isAnon() ) {
1579                         return false;
1580                 }
1581
1582                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1583                         $wgUser->addWatch( $this->mTitle );
1584
1585                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1586                 }
1587
1588                 return false;
1589         }
1590
1591         /**
1592          * User interface handler for the "unwatch" action.
1593          */
1594         function unwatch() {
1595
1596                 global $wgUser, $wgOut;
1597
1598                 if ( $wgUser->isAnon() ) {
1599                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1600                         return;
1601                 }
1602                 if ( wfReadOnly() ) {
1603                         $wgOut->readOnlyPage();
1604                         return;
1605                 }
1606
1607                 if( $this->doUnwatch() ) {
1608                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1609                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1610
1611                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1612                         $text = wfMsg( 'removedwatchtext', $link );
1613                         $wgOut->addWikiText( $text );
1614                 }
1615
1616                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1617         }
1618
1619         /**
1620          * Stop watching a page
1621          * @return bool true on successful unwatch
1622          */
1623         function doUnwatch() {
1624                 global $wgUser;
1625                 if( $wgUser->isAnon() ) {
1626                         return false;
1627                 }
1628
1629                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1630                         $wgUser->removeWatch( $this->mTitle );
1631
1632                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1633                 }
1634
1635                 return false;
1636         }
1637
1638         /**
1639          * action=protect handler
1640          */
1641         function protect() {
1642                 $form = new ProtectionForm( $this );
1643                 $form->execute();
1644         }
1645
1646         /**
1647          * action=unprotect handler (alias)
1648          */
1649         function unprotect() {
1650                 $this->protect();
1651         }
1652
1653         /**
1654          * Update the article's restriction field, and leave a log entry.
1655          *
1656          * @param array $limit set of restriction keys
1657          * @param string $reason
1658          * @return bool true on success
1659          */
1660         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1661                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1662
1663                 $id = $this->mTitle->getArticleID();
1664                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1665                         return false;
1666                 }
1667
1668                 if (!$cascade) {
1669                         $cascade = false;
1670                 }
1671
1672                 // Take this opportunity to purge out expired restrictions
1673                 Title::purgeExpiredRestrictions();
1674
1675                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1676                 # we expect a single selection, but the schema allows otherwise.
1677                 $current = array();
1678                 foreach( $wgRestrictionTypes as $action )
1679                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1680                 $current['robots'] = implode( '', $this->mTitle->getRestrictions( 'robots' ) );
1681
1682                 $current = Article::flattenRestrictions( $current );
1683                 $updated = Article::flattenRestrictions( $limit );
1684
1685                 $changed = ( $current != $updated );
1686                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1687                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1688                 $protect = ( $updated != '' );
1689
1690                 # If nothing's changed, do nothing
1691                 if( $changed ) {
1692                         global $wgGroupPermissions;
1693                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1694
1695                                 $dbw = wfGetDB( DB_MASTER );
1696
1697                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1698
1699                                 $expiry_description = '';
1700                                 if ( $encodedExpiry != 'infinity' ) {
1701                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1702                                 }
1703
1704                                 # Prepare a null revision to be added to the history
1705                                 $modified = $current != '' && $protect;
1706                                 if ( $protect ) {
1707                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1708                                 } else {
1709                                         $comment_type = 'unprotectedarticle';
1710                                 }
1711                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1712
1713                                 foreach( $limit as $action => $restrictions ) {
1714                                         # Check if the group level required to edit also can protect pages
1715                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1716                                         if ( in_array( $restrictions, $wgRestrictionTypes ) ) {
1717                                                 $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1718                                         }
1719                                 }
1720
1721                                 $cascade_description = '';
1722                                 if ($cascade) {
1723                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1724                                 }
1725
1726                                 if( $reason )
1727                                         $comment .= ": $reason";
1728                                 if( $protect )
1729                                         $comment .= " [$updated]";
1730                                 if ( $expiry_description && $protect )
1731                                         $comment .= "$expiry_description";
1732                                 if ( $cascade )
1733                                         $comment .= "$cascade_description";
1734
1735                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1736                                 $nullRevId = $nullRevision->insertOn( $dbw );
1737
1738                                 # Update restrictions table
1739                                 foreach( $limit as $action => $restrictions ) {
1740                                         if ($restrictions != '' ) {
1741                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1742                                                         array( 'pr_page' => $id, 'pr_type' => $action
1743                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1744                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1745                                         } else {
1746                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1747                                                         'pr_type' => $action ), __METHOD__ );
1748                                         }
1749                                 }
1750
1751                                 # Update page record
1752                                 $dbw->update( 'page',
1753                                         array( /* SET */
1754                                                 'page_touched' => $dbw->timestamp(),
1755                                                 'page_restrictions' => '',
1756                                                 'page_latest' => $nullRevId
1757                                         ), array( /* WHERE */
1758                                                 'page_id' => $id
1759                                         ), 'Article::protect'
1760                                 );
1761                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1762
1763                                 # Update the protection log
1764                                 $log = new LogPage( 'protect' );
1765
1766                                 if( $protect ) {
1767                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1768                                 } else {
1769                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1770                                 }
1771
1772                         } # End hook
1773                 } # End "changed" check
1774
1775                 return true;
1776         }
1777
1778         /**
1779          * Take an array of page restrictions and flatten it to a string
1780          * suitable for insertion into the page_restrictions field.
1781          * @param array $limit
1782          * @return string
1783          * @private
1784          */
1785         function flattenRestrictions( $limit ) {
1786                 if( !is_array( $limit ) ) {
1787                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1788                 }
1789                 $bits = array();
1790                 ksort( $limit );
1791                 foreach( $limit as $action => $restrictions ) {
1792                         if( $restrictions != '' ) {
1793                                 $bits[] = "$action=$restrictions";
1794                         }
1795                 }
1796                 return implode( ':', $bits );
1797         }
1798
1799         /*
1800          * UI entry point for page deletion
1801          */
1802         function delete() {
1803                 global $wgUser, $wgOut, $wgRequest;
1804                 $confirm = $wgRequest->wasPosted() &&
1805                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1806                 $reason = $wgRequest->getText( 'wpReason' );
1807
1808                 # This code desperately needs to be totally rewritten
1809
1810                 # Check permissions
1811                 if( $wgUser->isAllowed( 'delete' ) ) {
1812                         if( $wgUser->isBlocked( !$confirm ) ) {
1813                                 $wgOut->blockedPage();
1814                                 return;
1815                         }
1816                 } else {
1817                         $wgOut->permissionRequired( 'delete' );
1818                         return;
1819                 }
1820
1821                 if( wfReadOnly() ) {
1822                         $wgOut->readOnlyPage();
1823                         return;
1824                 }
1825
1826                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1827
1828                 # Better double-check that it hasn't been deleted yet!
1829                 $dbw = wfGetDB( DB_MASTER );
1830                 $conds = $this->mTitle->pageCond();
1831                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1832                 if ( $latest === false ) {
1833                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1834                         return;
1835                 }
1836
1837                 if( $confirm ) {
1838                         $this->doDelete( $reason );
1839                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1840                                 $this->doWatch();
1841                         } elseif( $this->mTitle->userIsWatching() ) {
1842                                 $this->doUnwatch();
1843                         }
1844                         return;
1845                 }
1846
1847                 # determine whether this page has earlier revisions
1848                 # and insert a warning if it does
1849                 $maxRevisions = 20;
1850                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1851
1852                 if( count( $authors ) > 1 && !$confirm ) {
1853                         $skin=$wgUser->getSkin();
1854                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1855                 }
1856
1857                 # If a single user is responsible for all revisions, find out who they are
1858                 if ( count( $authors ) == $maxRevisions ) {
1859                         // Query bailed out, too many revisions to find out if they're all the same
1860                         $authorOfAll = false;
1861                 } else {
1862                         $authorOfAll = reset( $authors );
1863                         foreach ( $authors as $author ) {
1864                                 if ( $authorOfAll != $author ) {
1865                                         $authorOfAll = false;
1866                                         break;
1867                                 }
1868                         }
1869                 }
1870                 # Fetch article text
1871                 $rev = Revision::newFromTitle( $this->mTitle );
1872
1873                 if( !is_null( $rev ) ) {
1874                         # if this is a mini-text, we can paste part of it into the deletion reason
1875                         $text = $rev->getText();
1876
1877                         #if this is empty, an earlier revision may contain "useful" text
1878                         $blanked = false;
1879                         if( $text == '' ) {
1880                                 $prev = $rev->getPrevious();
1881                                 if( $prev ) {
1882                                         $text = $prev->getText();
1883                                         $blanked = true;
1884                                 }
1885                         }
1886
1887                         $length = strlen( $text );
1888
1889                         # this should not happen, since it is not possible to store an empty, new
1890                         # page. Let's insert a standard text in case it does, though
1891                         if( $length == 0 && $reason === '' ) {
1892                                 $reason = wfMsgForContent( 'exblank' );
1893                         }
1894
1895                         if( $reason === '' ) {
1896                                 # comment field=255, let's grep the first 150 to have some user
1897                                 # space left
1898                                 global $wgContLang;
1899                                 $text = $wgContLang->truncate( $text, 150, '...' );
1900
1901                                 # let's strip out newlines
1902                                 $text = preg_replace( "/[\n\r]/", '', $text );
1903
1904                                 if( !$blanked ) {
1905                                         if( $authorOfAll === false ) {
1906                                                 $reason = wfMsgForContent( 'excontent', $text );
1907                                         } else {
1908                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1909                                         }
1910                                 } else {
1911                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1912                                 }
1913                         }
1914                 }
1915
1916                 return $this->confirmDelete( '', $reason );
1917         }
1918
1919         /**
1920          * Get the last N authors
1921          * @param int $num Number of revisions to get
1922          * @param string $revLatest The latest rev_id, selected from the master (optional)
1923          * @return array Array of authors, duplicates not removed
1924          */
1925         function getLastNAuthors( $num, $revLatest = 0 ) {
1926                 wfProfileIn( __METHOD__ );
1927
1928                 // First try the slave
1929                 // If that doesn't have the latest revision, try the master
1930                 $continue = 2;
1931                 $db = wfGetDB( DB_SLAVE );
1932                 do {
1933                         $res = $db->select( array( 'page', 'revision' ),
1934                                 array( 'rev_id', 'rev_user_text' ),
1935                                 array(
1936                                         'page_namespace' => $this->mTitle->getNamespace(),
1937                                         'page_title' => $this->mTitle->getDBkey(),
1938                                         'rev_page = page_id'
1939                                 ), __METHOD__, $this->getSelectOptions( array(
1940                                         'ORDER BY' => 'rev_timestamp DESC',
1941                                         'LIMIT' => $num
1942                                 ) )
1943                         );
1944                         if ( !$res ) {
1945                                 wfProfileOut( __METHOD__ );
1946                                 return array();
1947                         }
1948                         $row = $db->fetchObject( $res );
1949                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1950                                 $db = wfGetDB( DB_MASTER );
1951                                 $continue--;
1952                         } else {
1953                                 $continue = 0;
1954                         }
1955                 } while ( $continue );
1956
1957                 $authors = array( $row->rev_user_text );
1958                 while ( $row = $db->fetchObject( $res ) ) {
1959                         $authors[] = $row->rev_user_text;
1960                 }
1961                 wfProfileOut( __METHOD__ );
1962                 return $authors;
1963         }
1964
1965         /**
1966          * Output deletion confirmation dialog
1967          */
1968         function confirmDelete( $par, $reason ) {
1969                 global $wgOut, $wgUser;
1970
1971                 wfDebug( "Article::confirmDelete\n" );
1972
1973                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1974                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1975                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1976                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1977
1978                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1979
1980                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1981                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1982                 $token = htmlspecialchars( $wgUser->editToken() );
1983                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
1984
1985                 $wgOut->addHTML( "
1986 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1987         <table border='0'>
1988                 <tr>
1989                         <td align='right'>
1990                                 <label for='wpReason'>{$delcom}:</label>
1991                         </td>
1992                         <td align='left'>
1993                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"1\" />
1994                         </td>
1995                 </tr>
1996                 <tr>
1997                         <td>&nbsp;</td>
1998                         <td>$watch</td>
1999                 </tr>
2000                 <tr>
2001                         <td>&nbsp;</td>
2002                         <td>
2003                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
2004                         </td>
2005                 </tr>
2006         </table>
2007         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2008 </form>\n" );
2009
2010                 $wgOut->returnToMain( false );
2011
2012                 $this->showLogExtract( $wgOut );
2013         }
2014
2015
2016         /**
2017          * Show relevant lines from the deletion log
2018          */
2019         function showLogExtract( $out ) {
2020                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2021                 $logViewer = new LogViewer(
2022                         new LogReader(
2023                                 new FauxRequest(
2024                                         array( 'page' => $this->mTitle->getPrefixedText(),
2025                                                'type' => 'delete' ) ) ) );
2026                 $logViewer->showList( $out );
2027         }
2028
2029
2030         /**
2031          * Perform a deletion and output success or failure messages
2032          */
2033         function doDelete( $reason ) {
2034                 global $wgOut, $wgUser;
2035                 wfDebug( __METHOD__."\n" );
2036
2037                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2038                         if ( $this->doDeleteArticle( $reason ) ) {
2039                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2040
2041                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2042                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2043
2044                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2045                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2046
2047                                 $wgOut->addWikiText( $text );
2048                                 $wgOut->returnToMain( false );
2049                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2050                         } else {
2051                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2052                         }
2053                 }
2054         }
2055
2056         /**
2057          * Back-end article deletion
2058          * Deletes the article with database consistency, writes logs, purges caches
2059          * Returns success
2060          */
2061         function doDeleteArticle( $reason ) {
2062                 global $wgUseSquid, $wgDeferredUpdateList;
2063                 global $wgUseTrackbacks;
2064
2065                 wfDebug( __METHOD__."\n" );
2066
2067                 $dbw = wfGetDB( DB_MASTER );
2068                 $ns = $this->mTitle->getNamespace();
2069                 $t = $this->mTitle->getDBkey();
2070                 $id = $this->mTitle->getArticleID();
2071
2072                 if ( $t == '' || $id == 0 ) {
2073                         return false;
2074                 }
2075
2076                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2077                 array_push( $wgDeferredUpdateList, $u );
2078
2079                 // For now, shunt the revision data into the archive table.
2080                 // Text is *not* removed from the text table; bulk storage
2081                 // is left intact to avoid breaking block-compression or
2082                 // immutable storage schemes.
2083                 //
2084                 // For backwards compatibility, note that some older archive
2085                 // table entries will have ar_text and ar_flags fields still.
2086                 //
2087                 // In the future, we may keep revisions and mark them with
2088                 // the rev_deleted field, which is reserved for this purpose.
2089                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2090                         array(
2091                                 'ar_namespace'  => 'page_namespace',
2092                                 'ar_title'      => 'page_title',
2093                                 'ar_comment'    => 'rev_comment',
2094                                 'ar_user'       => 'rev_user',
2095                                 'ar_user_text'  => 'rev_user_text',
2096                                 'ar_timestamp'  => 'rev_timestamp',
2097                                 'ar_minor_edit' => 'rev_minor_edit',
2098                                 'ar_rev_id'     => 'rev_id',
2099                                 'ar_text_id'    => 'rev_text_id',
2100                                 'ar_text'       => '\'\'', // Be explicit to appease
2101                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2102                                 'ar_len'                => 'rev_len'
2103                         ), array(
2104                                 'page_id' => $id,
2105                                 'page_id = rev_page'
2106                         ), __METHOD__
2107                 );
2108
2109                 # Delete restrictions for it
2110                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2111
2112                 # Now that it's safely backed up, delete it
2113                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2114
2115                 # If using cascading deletes, we can skip some explicit deletes
2116                 if ( !$dbw->cascadingDeletes() ) {
2117
2118                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2119
2120                         if ($wgUseTrackbacks)
2121                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2122
2123                         # Delete outgoing links
2124                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2125                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2126                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2127                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2128                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2129                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2130                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2131                 }
2132
2133                 # If using cleanup triggers, we can skip some manual deletes
2134                 if ( !$dbw->cleanupTriggers() ) {
2135
2136                         # Clean up recentchanges entries...
2137                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2138                 }
2139
2140                 # Clear caches
2141                 Article::onArticleDelete( $this->mTitle );
2142
2143                 # Log the deletion
2144                 $log = new LogPage( 'delete' );
2145                 $log->addEntry( 'delete', $this->mTitle, $reason );
2146
2147                 # Clear the cached article id so the interface doesn't act like we exist
2148                 $this->mTitle->resetArticleID( 0 );
2149                 $this->mTitle->mArticleID = 0;
2150                 return true;
2151         }
2152
2153         /**
2154          * Revert a modification
2155          */
2156         function rollback() {
2157                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2158
2159                 if( $wgUser->isAllowed( 'rollback' ) ) {
2160                         if( $wgUser->isBlocked() ) {
2161                                 $wgOut->blockedPage();
2162                                 return;
2163                         }
2164                 } else {
2165                         $wgOut->permissionRequired( 'rollback' );
2166                         return;
2167                 }
2168
2169                 if ( wfReadOnly() ) {
2170                         $wgOut->readOnlyPage( $this->getContent() );
2171                         return;
2172                 }
2173                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2174                         array( $this->mTitle->getPrefixedText(),
2175                                 $wgRequest->getVal( 'from' ) )  ) ) {
2176                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2177                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2178                         return;
2179                 }
2180                 $dbw = wfGetDB( DB_MASTER );
2181
2182                 # Enhanced rollback, marks edits rc_bot=1
2183                 $bot = $wgRequest->getBool( 'bot' );
2184
2185                 # Replace all this user's current edits with the next one down
2186
2187                 # Get the last editor
2188                 $current = Revision::newFromTitle( $this->mTitle );
2189                 if( is_null( $current ) ) {
2190                         # Something wrong... no page?
2191                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2192                         return;
2193                 }
2194
2195                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2196                 if( $from != $current->getUserText() ) {
2197                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2198                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2199                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2200                                 htmlspecialchars( $from ),
2201                                 htmlspecialchars( $current->getUserText() ) ) );
2202                         if( $current->getComment() != '') {
2203                                 $wgOut->addHTML(
2204                                         wfMsg( 'editcomment',
2205                                         $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2206                         }
2207                         return;
2208                 }
2209
2210                 # Get the last edit not by this guy
2211                 $user = intval( $current->getUser() );
2212                 $user_text = $dbw->addQuotes( $current->getUserText() );
2213                 $s = $dbw->selectRow( 'revision',
2214                         array( 'rev_id', 'rev_timestamp' ),
2215                         array(
2216                                 'rev_page' => $current->getPage(),
2217                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2218                         ), __METHOD__,
2219                         array(
2220                                 'USE INDEX' => 'page_timestamp',
2221                                 'ORDER BY'  => 'rev_timestamp DESC' )
2222                         );
2223                 if( $s === false ) {
2224                         # Something wrong
2225                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2226                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2227                         return;
2228                 }
2229
2230                 $set = array();
2231                 if ( $bot ) {
2232                         # Mark all reverted edits as bot
2233                         $set['rc_bot'] = 1;
2234                 }
2235                 if ( $wgUseRCPatrol ) {
2236                         # Mark all reverted edits as patrolled
2237                         $set['rc_patrolled'] = 1;
2238                 }
2239
2240                 if ( $set ) {
2241                         $dbw->update( 'recentchanges', $set,
2242                                 array( /* WHERE */
2243                                         'rc_cur_id'    => $current->getPage(),
2244                                         'rc_user_text' => $current->getUserText(),
2245                                         "rc_timestamp > '{$s->rev_timestamp}'",
2246                                 ), __METHOD__
2247                         );
2248                 }
2249
2250                 # Get the edit summary
2251                 $target = Revision::newFromId( $s->rev_id );
2252                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2253                 $newComment = $wgRequest->getText( 'summary', $newComment );
2254
2255                 # Save it!
2256                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2257                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2258                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2259
2260                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2261
2262                 $wgOut->returnToMain( false );
2263         }
2264
2265
2266         /**
2267          * Do standard deferred updates after page view
2268          * @private
2269          */
2270         function viewUpdates() {
2271                 global $wgDeferredUpdateList;
2272
2273                 if ( 0 != $this->getID() ) {
2274                         global $wgDisableCounters;
2275                         if( !$wgDisableCounters ) {
2276                                 Article::incViewCount( $this->getID() );
2277                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2278                                 array_push( $wgDeferredUpdateList, $u );
2279                         }
2280                 }
2281
2282                 # Update newtalk / watchlist notification status
2283                 global $wgUser;
2284                 $wgUser->clearNotification( $this->mTitle );
2285         }
2286
2287         /**
2288          * Do standard deferred updates after page edit.
2289          * Update links tables, site stats, search index and message cache.
2290          * Every 1000th edit, prune the recent changes table.
2291          *
2292          * @private
2293          * @param $text New text of the article
2294          * @param $summary Edit summary
2295          * @param $minoredit Minor edit
2296          * @param $timestamp_of_pagechange Timestamp associated with the page change
2297          * @param $newid rev_id value of the new revision
2298          * @param $changed Whether or not the content actually changed
2299          */
2300         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2301                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2302
2303                 wfProfileIn( __METHOD__ );
2304
2305                 # Parse the text
2306                 $options = new ParserOptions;
2307                 $options->setTidy(true);
2308                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2309
2310                 # Save it to the parser cache
2311                 $parserCache =& ParserCache::singleton();
2312                 $parserCache->save( $poutput, $this, $wgUser );
2313
2314                 # Update the links tables
2315                 $u = new LinksUpdate( $this->mTitle, $poutput );
2316                 $u->doUpdate();
2317
2318                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2319                         wfSeedRandom();
2320                         if ( 0 == mt_rand( 0, 999 ) ) {
2321                                 # Periodically flush old entries from the recentchanges table.
2322                                 global $wgRCMaxAge;
2323
2324                                 $dbw = wfGetDB( DB_MASTER );
2325                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2326                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2327                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2328                                 $dbw->query( $sql );
2329                         }
2330                 }
2331
2332                 $id = $this->getID();
2333                 $title = $this->mTitle->getPrefixedDBkey();
2334                 $shortTitle = $this->mTitle->getDBkey();
2335
2336                 if ( 0 == $id ) {
2337                         wfProfileOut( __METHOD__ );
2338                         return;
2339                 }
2340
2341                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2342                 array_push( $wgDeferredUpdateList, $u );
2343                 $u = new SearchUpdate( $id, $title, $text );
2344                 array_push( $wgDeferredUpdateList, $u );
2345
2346                 # If this is another user's talk page, update newtalk
2347                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2348                 # load of user talk pages and piss people off, nor if it's a minor edit
2349                 # by a properly-flagged bot.
2350                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2351                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2352                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2353                                 $other = User::newFromName( $shortTitle );
2354                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2355                                         // An anonymous user
2356                                         $other = new User();
2357                                         $other->setName( $shortTitle );
2358                                 }
2359                                 if( $other ) {
2360                                         $other->setNewtalk( true );
2361                                 }
2362                         }
2363                 }
2364
2365                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2366                         $wgMessageCache->replace( $shortTitle, $text );
2367                 }
2368
2369                 wfProfileOut( __METHOD__ );
2370         }
2371
2372         /**
2373          * Perform article updates on a special page creation.
2374          *
2375          * @param Revision $rev
2376          *
2377          * @todo This is a shitty interface function. Kill it and replace the
2378          * other shitty functions like editUpdates and such so it's not needed
2379          * anymore.
2380          */
2381         function createUpdates( $rev ) {
2382                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2383                 $this->mTotalAdjustment = 1;
2384                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2385                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2386         }
2387
2388         /**
2389          * Generate the navigation links when browsing through an article revisions
2390          * It shows the information as:
2391          *   Revision as of \<date\>; view current revision
2392          *   \<- Previous version | Next Version -\>
2393          *
2394          * @private
2395          * @param string $oldid         Revision ID of this article revision
2396          */
2397         function setOldSubtitle( $oldid=0 ) {
2398                 global $wgLang, $wgOut, $wgUser;
2399
2400                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2401                                 return;
2402                 }
2403
2404                 $revision = Revision::newFromId( $oldid );
2405
2406                 $current = ( $oldid == $this->mLatest );
2407                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2408                 $sk = $wgUser->getSkin();
2409                 $lnk = $current
2410                         ? wfMsg( 'currentrevisionlink' )
2411                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2412                 $curdiff = $current
2413                         ? wfMsg( 'diff' )
2414                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2415                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2416                 $prevlink = $prev
2417                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2418                         : wfMsg( 'previousrevision' );
2419                 $prevdiff = $prev
2420                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2421                         : wfMsg( 'diff' );
2422                 $nextlink = $current
2423                         ? wfMsg( 'nextrevision' )
2424                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2425                 $nextdiff = $current
2426                         ? wfMsg( 'diff' )
2427                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2428
2429                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2430                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2431
2432                 $m = wfMsg( 'revision-info-current' );
2433                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2434                         ? 'revision-info-current'
2435                         : 'revision-info';
2436
2437                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2438                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2439                 $wgOut->setSubtitle( $r );
2440         }
2441
2442         /**
2443          * This function is called right before saving the wikitext,
2444          * so we can do things like signatures and links-in-context.
2445          *
2446          * @param string $text
2447          */
2448         function preSaveTransform( $text ) {
2449                 global $wgParser, $wgUser;
2450                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2451         }
2452
2453         /* Caching functions */
2454
2455         /**
2456          * checkLastModified returns true if it has taken care of all
2457          * output to the client that is necessary for this request.
2458          * (that is, it has sent a cached version of the page)
2459          */
2460         function tryFileCache() {
2461                 static $called = false;
2462                 if( $called ) {
2463                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2464                         return;
2465                 }
2466                 $called = true;
2467                 if($this->isFileCacheable()) {
2468                         $touched = $this->mTouched;
2469                         $cache = new HTMLFileCache( $this->mTitle );
2470                         if($cache->isFileCacheGood( $touched )) {
2471                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2472                                 $cache->loadFromFileCache();
2473                                 return true;
2474                         } else {
2475                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2476                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2477                         }
2478                 } else {
2479                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2480                 }
2481         }
2482
2483         /**
2484          * Check if the page can be cached
2485          * @return bool
2486          */
2487         function isFileCacheable() {
2488                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2489                 $action    = $wgRequest->getVal( 'action'    );
2490                 $oldid     = $wgRequest->getVal( 'oldid'     );
2491                 $diff      = $wgRequest->getVal( 'diff'      );
2492                 $redirect  = $wgRequest->getVal( 'redirect'  );
2493                 $printable = $wgRequest->getVal( 'printable' );
2494                 $page      = $wgRequest->getVal( 'page' );
2495
2496                 //check for non-standard user language; this covers uselang,
2497                 //and extensions for auto-detecting user language.
2498                 $ulang     = $wgLang->getCode();
2499                 $clang     = $wgContLang->getCode();
2500
2501                 $cacheable = $wgUseFileCache
2502                         && (!$wgShowIPinHeader)
2503                         && ($this->getID() != 0)
2504                         && ($wgUser->isAnon())
2505                         && (!$wgUser->getNewtalk())
2506                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2507                         && (empty( $action ) || $action == 'view')
2508                         && (!isset($oldid))
2509                         && (!isset($diff))
2510                         && (!isset($redirect))
2511                         && (!isset($printable))
2512                         && !isset($page)
2513                         && (!$this->mRedirectedFrom)
2514                         && ($ulang === $clang);
2515
2516                 if ( $cacheable ) {
2517                         //extension may have reason to disable file caching on some pages.
2518                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2519                 }
2520
2521                 return $cacheable;
2522         }
2523
2524         /**
2525          * Loads page_touched and returns a value indicating if it should be used
2526          *
2527          */
2528         function checkTouched() {
2529                 if( !$this->mDataLoaded ) {
2530                         $this->loadPageData();
2531                 }
2532                 return !$this->mIsRedirect;
2533         }
2534
2535         /**
2536          * Get the page_touched field
2537          */
2538         function getTouched() {
2539                 # Ensure that page data has been loaded
2540                 if( !$this->mDataLoaded ) {
2541                         $this->loadPageData();
2542                 }
2543                 return $this->mTouched;
2544         }
2545
2546         /**
2547          * Get the page_latest field
2548          */
2549         function getLatest() {
2550                 if ( !$this->mDataLoaded ) {
2551                         $this->loadPageData();
2552                 }
2553                 return $this->mLatest;
2554         }
2555
2556         /**
2557          * Edit an article without doing all that other stuff
2558          * The article must already exist; link tables etc
2559          * are not updated, caches are not flushed.
2560          *
2561          * @param string $text text submitted
2562          * @param string $comment comment submitted
2563          * @param bool $minor whereas it's a minor modification
2564          */
2565         function quickEdit( $text, $comment = '', $minor = 0 ) {
2566                 wfProfileIn( __METHOD__ );
2567
2568                 $dbw = wfGetDB( DB_MASTER );
2569                 $dbw->begin();
2570                 $revision = new Revision( array(
2571                         'page'       => $this->getId(),
2572                         'text'       => $text,
2573                         'comment'    => $comment,
2574                         'minor_edit' => $minor ? 1 : 0,
2575                         ) );
2576                 $revision->insertOn( $dbw );
2577                 $this->updateRevisionOn( $dbw, $revision );
2578                 $dbw->commit();
2579
2580                 wfProfileOut( __METHOD__ );
2581         }
2582
2583         /**
2584          * Used to increment the view counter
2585          *
2586          * @static
2587          * @param integer $id article id
2588          */
2589         function incViewCount( $id ) {
2590                 $id = intval( $id );
2591                 global $wgHitcounterUpdateFreq, $wgDBtype;
2592
2593                 $dbw = wfGetDB( DB_MASTER );
2594                 $pageTable = $dbw->tableName( 'page' );
2595                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2596                 $acchitsTable = $dbw->tableName( 'acchits' );
2597
2598                 if( $wgHitcounterUpdateFreq <= 1 ) {
2599                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2600                         return;
2601                 }
2602
2603                 # Not important enough to warrant an error page in case of failure
2604                 $oldignore = $dbw->ignoreErrors( true );
2605
2606                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2607
2608                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2609                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2610                         # Most of the time (or on SQL errors), skip row count check
2611                         $dbw->ignoreErrors( $oldignore );
2612                         return;
2613                 }
2614
2615                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2616                 $row = $dbw->fetchObject( $res );
2617                 $rown = intval( $row->n );
2618                 if( $rown >= $wgHitcounterUpdateFreq ){
2619                         wfProfileIn( 'Article::incViewCount-collect' );
2620                         $old_user_abort = ignore_user_abort( true );
2621
2622                         if ($wgDBtype == 'mysql')
2623                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2624                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2625                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2626                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2627                                 'GROUP BY hc_id');
2628                         $dbw->query("DELETE FROM $hitcounterTable");
2629                         if ($wgDBtype == 'mysql') {
2630                                 $dbw->query('UNLOCK TABLES');
2631                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2632                                         'WHERE page_id = hc_id');
2633                         }
2634                         else {
2635                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2636                                         "FROM $acchitsTable WHERE page_id = hc_id");
2637                         }
2638                         $dbw->query("DROP TABLE $acchitsTable");
2639
2640                         ignore_user_abort( $old_user_abort );
2641                         wfProfileOut( 'Article::incViewCount-collect' );
2642                 }
2643                 $dbw->ignoreErrors( $oldignore );
2644         }
2645
2646         /**#@+
2647          * The onArticle*() functions are supposed to be a kind of hooks
2648          * which should be called whenever any of the specified actions
2649          * are done.
2650          *
2651          * This is a good place to put code to clear caches, for instance.
2652          *
2653          * This is called on page move and undelete, as well as edit
2654          * @static
2655          * @param $title_obj a title object
2656          */
2657
2658         static function onArticleCreate($title) {
2659                 # The talk page isn't in the regular link tables, so we need to update manually:
2660                 if ( $title->isTalkPage() ) {
2661                         $other = $title->getSubjectPage();
2662                 } else {
2663                         $other = $title->getTalkPage();
2664                 }
2665                 $other->invalidateCache();
2666                 $other->purgeSquid();
2667
2668                 $title->touchLinks();
2669                 $title->purgeSquid();
2670         }
2671
2672         static function onArticleDelete( $title ) {
2673                 global $wgUseFileCache, $wgMessageCache;
2674
2675                 $title->touchLinks();
2676                 $title->purgeSquid();
2677
2678                 # File cache
2679                 if ( $wgUseFileCache ) {
2680                         $cm = new HTMLFileCache( $title );
2681                         @unlink( $cm->fileCacheName() );
2682                 }
2683
2684                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2685                         $wgMessageCache->replace( $title->getDBkey(), false );
2686                 }
2687         }
2688
2689         /**
2690          * Purge caches on page update etc
2691          */
2692         static function onArticleEdit( $title ) {
2693                 global $wgDeferredUpdateList, $wgUseFileCache;
2694
2695                 // Invalidate caches of articles which include this page
2696                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2697                 $wgDeferredUpdateList[] = $update;
2698
2699                 # Purge squid for this page only
2700                 $title->purgeSquid();
2701
2702                 # Clear file cache
2703                 if ( $wgUseFileCache ) {
2704                         $cm = new HTMLFileCache( $title );
2705                         @unlink( $cm->fileCacheName() );
2706                 }
2707         }
2708
2709         /**#@-*/
2710
2711         /**
2712          * Info about this page
2713          * Called for ?action=info when $wgAllowPageInfo is on.
2714          *
2715          * @public
2716          */
2717         function info() {
2718                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2719
2720                 if ( !$wgAllowPageInfo ) {
2721                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2722                         return;
2723                 }
2724
2725                 $page = $this->mTitle->getSubjectPage();
2726
2727                 $wgOut->setPagetitle( $page->getPrefixedText() );
2728                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2729
2730                 # first, see if the page exists at all.
2731                 $exists = $page->getArticleId() != 0;
2732                 if( !$exists ) {
2733                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2734                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2735                         } else {
2736                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2737                         }
2738                 } else {
2739                         $dbr = wfGetDB( DB_SLAVE );
2740                         $wl_clause = array(
2741                                 'wl_title'     => $page->getDBkey(),
2742                                 'wl_namespace' => $page->getNamespace() );
2743                         $numwatchers = $dbr->selectField(
2744                                 'watchlist',
2745                                 'COUNT(*)',
2746                                 $wl_clause,
2747                                 __METHOD__,
2748                                 $this->getSelectOptions() );
2749
2750                         $pageInfo = $this->pageCountInfo( $page );
2751                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2752
2753                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2754                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2755                         if( $talkInfo ) {
2756                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2757                         }
2758                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2759                         if( $talkInfo ) {
2760                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2761                         }
2762                         $wgOut->addHTML( '</ul>' );
2763
2764                 }
2765         }
2766
2767         /**
2768          * Return the total number of edits and number of unique editors
2769          * on a given page. If page does not exist, returns false.
2770          *
2771          * @param Title $title
2772          * @return array
2773          * @private
2774          */
2775         function pageCountInfo( $title ) {
2776                 $id = $title->getArticleId();
2777                 if( $id == 0 ) {
2778                         return false;
2779                 }
2780
2781                 $dbr = wfGetDB( DB_SLAVE );
2782
2783                 $rev_clause = array( 'rev_page' => $id );
2784
2785                 $edits = $dbr->selectField(
2786                         'revision',
2787                         'COUNT(rev_page)',
2788                         $rev_clause,
2789                         __METHOD__,
2790                         $this->getSelectOptions() );
2791
2792                 $authors = $dbr->selectField(
2793                         'revision',
2794                         'COUNT(DISTINCT rev_user_text)',
2795                         $rev_clause,
2796                         __METHOD__,
2797                         $this->getSelectOptions() );
2798
2799                 return array( 'edits' => $edits, 'authors' => $authors );
2800         }
2801
2802         /**
2803          * Return a list of templates used by this article.
2804          * Uses the templatelinks table
2805          *
2806          * @return array Array of Title objects
2807          */
2808         function getUsedTemplates() {
2809                 $result = array();
2810                 $id = $this->mTitle->getArticleID();
2811                 if( $id == 0 ) {
2812                         return array();
2813                 }
2814
2815                 $dbr = wfGetDB( DB_SLAVE );
2816                 $res = $dbr->select( array( 'templatelinks' ),
2817                         array( 'tl_namespace', 'tl_title' ),
2818                         array( 'tl_from' => $id ),
2819                         'Article:getUsedTemplates' );
2820                 if ( false !== $res ) {
2821                         if ( $dbr->numRows( $res ) ) {
2822                                 while ( $row = $dbr->fetchObject( $res ) ) {
2823                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2824                                 }
2825                         }
2826                 }
2827                 $dbr->freeResult( $res );
2828                 return $result;
2829         }
2830
2831         /**
2832          * Return an auto-generated summary if the text provided is a redirect.
2833          *
2834          * @param  string $text The wikitext to check
2835          * @return string '' or an appropriate summary
2836          */
2837         public static function getRedirectAutosummary( $text ) {
2838                 $rt = Title::newFromRedirect( $text );
2839                 if( is_object( $rt ) )
2840                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2841                 else
2842                         return '';
2843         }
2844
2845         /**
2846          * Return an auto-generated summary if the new text is much shorter than
2847          * the old text.
2848          *
2849          * @param  string $oldtext The previous text of the page
2850          * @param  string $text    The submitted text of the page
2851          * @return string An appropriate autosummary, or an empty string.
2852          */
2853         public static function getBlankingAutosummary( $oldtext, $text ) {
2854                 if ($oldtext!='' && $text=='') {
2855                         return wfMsgForContent('autosumm-blank');
2856                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
2857                         #Removing more than 90% of the article
2858                         global $wgContLang;
2859                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
2860                         return wfMsgForContent('autosumm-replace', $truncatedtext);
2861                 } else {
2862                         return '';
2863                 }
2864         }
2865
2866         /**
2867         * Return an applicable autosummary if one exists for the given edit.
2868         * @param string $oldtext The previous text of the page.
2869         * @param string $newtext The submitted text of the page.
2870         * @param bitmask $flags A bitmask of flags submitted for the edit.
2871         * @return string An appropriate autosummary, or an empty string.
2872         */
2873         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2874
2875                 # This code is UGLY UGLY UGLY.
2876                 # Somebody PLEASE come up with a more elegant way to do it.
2877
2878                 #Redirect autosummaries
2879                 $summary = self::getRedirectAutosummary( $newtext );
2880
2881                 if ($summary)
2882                         return $summary;
2883
2884                 #Blanking autosummaries
2885                 if (!($flags & EDIT_NEW))
2886                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
2887
2888                 if ($summary)
2889                         return $summary;
2890
2891                 #New page autosummaries
2892                 if ($flags & EDIT_NEW && strlen($newtext)) {
2893                         #If they're making a new article, give its text, truncated, in the summary.
2894                         global $wgContLang;
2895                         $truncatedtext = $wgContLang->truncate(
2896                                 str_replace("\n", ' ', $newtext),
2897                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
2898                                 '...' );
2899                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
2900                 }
2901
2902                 if ($summary)
2903                         return $summary;
2904
2905                 return $summary;
2906         }
2907
2908         /**
2909          * Add the primary page-view wikitext to the output buffer
2910          * Saves the text into the parser cache if possible.
2911          * Updates templatelinks if it is out of date.
2912          *
2913          * @param string  $text
2914          * @param bool    $cache
2915          */
2916         public function outputWikiText( $text, $cache = true ) {
2917                 global $wgParser, $wgUser, $wgOut;
2918
2919                 $popts = $wgOut->parserOptions();
2920                 $popts->setTidy(true);
2921                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
2922                         $popts, true, true, $this->getRevIdFetched() );
2923                 $popts->setTidy(false);
2924                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
2925                         $parserCache =& ParserCache::singleton();
2926                         $parserCache->save( $parserOutput, $this, $wgUser );
2927                 }
2928
2929                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
2930                         // templatelinks table may have become out of sync,
2931                         // especially if using variable-based transclusions.
2932                         // For paranoia, check if things have changed and if
2933                         // so apply updates to the database. This will ensure
2934                         // that cascaded protections apply as soon as the changes
2935                         // are visible.
2936
2937                         # Get templates from templatelinks
2938                         $id = $this->mTitle->getArticleID();
2939
2940                         $tlTemplates = array();
2941
2942                         $dbr = wfGetDB( DB_SLAVE );
2943                         $res = $dbr->select( array( 'templatelinks' ),
2944                                 array( 'tl_namespace', 'tl_title' ),
2945                                 array( 'tl_from' => $id ),
2946                                 'Article:getUsedTemplates' );
2947
2948                         global $wgContLang;
2949
2950                         if ( false !== $res ) {
2951                                 if ( $dbr->numRows( $res ) ) {
2952                                         while ( $row = $dbr->fetchObject( $res ) ) {
2953                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
2954                                         }
2955                                 }
2956                         }
2957
2958                         # Get templates from parser output.
2959                         $poTemplates_allns = $parserOutput->getTemplates();
2960
2961                         $poTemplates = array ();
2962                         foreach ( $poTemplates_allns as $ns_templates ) {
2963                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
2964                         }
2965
2966                         # Get the diff
2967                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
2968
2969                         if ( count( $templates_diff ) > 0 ) {
2970                                 # Whee, link updates time.
2971                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
2972
2973                                 $dbw = wfGetDb( DB_MASTER );
2974                                 $dbw->begin();
2975
2976                                 $u->doUpdate();
2977
2978                                 $dbw->commit();
2979                         }
2980                 }
2981
2982                 $wgOut->addParserOutput( $parserOutput );
2983         }
2984
2985 }
2986
2987 ?>