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                 // We want to show the content even if the page doesn't exist, as long
 145                 // as the revision does (perhaps it's been moved and the redirect
 146                 // deleted: bug 10377)
 147                 if ( 0 == $this->getID() and !$this->mOldId ) {
 148                         wfProfileOut( __METHOD__ );
 149                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 150
 151                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 152                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 153                         } else {
 154                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 155                         }
 156
 157                         return "<div class='noarticletext'>$ret</div>";
 158                 } else {
 159                         $this->loadContent();
 160                         wfProfileOut( __METHOD__ );
 161                         return $this->mContent;
 162                 }
 163         }
 164
 165         /**
 166          * This function returns the text of a section, specified by a number ($section).
 167          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 168          * the first section before any such heading (section 0).
 169          *
 170          * If a section contains subsections, these are also returned.
 171          *
 172          * @param $text String: text to look in
 173          * @param $section Integer: section number
 174          * @return string text of the requested section
 175          * @deprecated
 176          */
 177         function getSection($text,$section) {
 178                 global $wgParser;
 179                 return $wgParser->getSection( $text, $section );
 180         }
 181
 182         /**
 183          * @return int The oldid of the article that is to be shown, 0 for the
 184          *             current revision
 185          */
 186         function getOldID() {
 187                 if ( is_null( $this->mOldId ) ) {
 188                         $this->mOldId = $this->getOldIDFromRequest();
 189                 }
 190                 return $this->mOldId;
 191         }
 192
 193         /**
 194          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 195          *
 196          * @return int The old id for the request
 197          */
 198         function getOldIDFromRequest() {
 199                 global $wgRequest;
 200                 $this->mRedirectUrl = false;
 201                 $oldid = $wgRequest->getVal( 'oldid' );
 202                 if ( isset( $oldid ) ) {
 203                         $oldid = intval( $oldid );
 204                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 205                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 206                                 if ( $nextid  ) {
 207                                         $oldid = $nextid;
 208                                 } else {
 209                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 210                                 }
 211                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 212                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 213                                 if ( $previd ) {
 214                                         $oldid = $previd;
 215                                 } else {
 216                                         # TODO
 217                                 }
 218                         }
 219                         # unused:
 220                         # $lastid = $oldid;
 221                 }
 222
 223                 if ( !$oldid ) {
 224                         $oldid = 0;
 225                 }
 226                 return $oldid;
 227         }
 228
 229         /**
 230          * Load the revision (including text) into this object
 231          */
 232         function loadContent() {
 233                 if ( $this->mContentLoaded ) return;
 234
 235                 # Query variables :P
 236                 $oldid = $this->getOldID();
 237
 238                 # Pre-fill content with error message so that if something
 239                 # fails we'll have something telling us what we intended.
 240                 $this->mOldId = $oldid;
 241                 $this->fetchContent( $oldid );
 242         }
 243
 244
 245         /**
 246          * Fetch a page record with the given conditions
 247          * @param Database $dbr
 248          * @param array    $conditions
 249          * @private
 250          */
 251         function pageData( $dbr, $conditions ) {
 252                 $fields = array(
 253                                 'page_id',
 254                                 'page_namespace',
 255                                 'page_title',
 256                                 'page_restrictions',
 257                                 'page_counter',
 258                                 'page_is_redirect',
 259                                 'page_is_new',
 260                                 'page_random',
 261                                 'page_touched',
 262                                 'page_latest',
 263                                 'page_len' ) ;
 264                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 265                 $row = $dbr->selectRow( 'page',
 266                         $fields,
 267                         $conditions,
 268                         'Article::pageData' );
 269                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 270                 return $row ;
 271         }
 272
 273         /**
 274          * @param Database $dbr
 275          * @param Title $title
 276          */
 277         function pageDataFromTitle( $dbr, $title ) {
 278                 return $this->pageData( $dbr, array(
 279                         'page_namespace' => $title->getNamespace(),
 280                         'page_title'     => $title->getDBkey() ) );
 281         }
 282
 283         /**
 284          * @param Database $dbr
 285          * @param int $id
 286          */
 287         function pageDataFromId( $dbr, $id ) {
 288                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 289         }
 290
 291         /**
 292          * Set the general counter, title etc data loaded from
 293          * some source.
 294          *
 295          * @param object $data
 296          * @private
 297          */
 298         function loadPageData( $data = 'fromdb' ) {
 299                 if ( $data === 'fromdb' ) {
 300                         $dbr = $this->getDB();
 301                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 302                 }
 303
 304                 $lc =& LinkCache::singleton();
 305                 if ( $data ) {
 306                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 307
 308                         $this->mTitle->mArticleID = $data->page_id;
 309
 310                         # Old-fashioned restrictions.
 311                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 312
 313                         $this->mCounter     = $data->page_counter;
 314                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 315                         $this->mIsRedirect  = $data->page_is_redirect;
 316                         $this->mLatest      = $data->page_latest;
 317                 } else {
 318                         if ( is_object( $this->mTitle ) ) {
 319                                 $lc->addBadLinkObj( $this->mTitle );
 320                         }
 321                         $this->mTitle->mArticleID = 0;
 322                 }
 323
 324                 $this->mDataLoaded  = true;
 325         }
 326
 327         /**
 328          * Get text of an article from database
 329          * Does *NOT* follow redirects.
 330          * @param int $oldid 0 for whatever the latest revision is
 331          * @return string
 332          */
 333         function fetchContent( $oldid = 0 ) {
 334                 if ( $this->mContentLoaded ) {
 335                         return $this->mContent;
 336                 }
 337
 338                 $dbr = $this->getDB();
 339
 340                 # Pre-fill content with error message so that if something
 341                 # fails we'll have something telling us what we intended.
 342                 $t = $this->mTitle->getPrefixedText();
 343                 if( $oldid ) {
 344                         $t .= ',oldid='.$oldid;
 345                 }
 346                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 347
 348                 if( $oldid ) {
 349                         $revision = Revision::newFromId( $oldid );
 350                         if( is_null( $revision ) ) {
 351                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 352                                 return false;
 353                         }
 354                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 355                         if( !$data ) {
 356                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 357                                 return false;
 358                         }
 359                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 360                         $this->loadPageData( $data );
 361                 } else {
 362                         if( !$this->mDataLoaded ) {
 363                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 364                                 if( !$data ) {
 365                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 366                                         return false;
 367                                 }
 368                                 $this->loadPageData( $data );
 369                         }
 370                         $revision = Revision::newFromId( $this->mLatest );
 371                         if( is_null( $revision ) ) {
 372                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 373                                 return false;
 374                         }
 375                 }
 376
 377                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 378                 // We should instead work with the Revision object when we need it...
 379                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 380                 //$this->mContent   = $revision->getText();
 381
 382                 $this->mUser      = $revision->getUser();
 383                 $this->mUserText  = $revision->getUserText();
 384                 $this->mComment   = $revision->getComment();
 385                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 386
 387                 $this->mRevIdFetched = $revision->getID();
 388                 $this->mContentLoaded = true;
 389                 $this->mRevision =& $revision;
 390
 391                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 392
 393                 return $this->mContent;
 394         }
 395
 396         /**
 397          * Read/write accessor to select FOR UPDATE
 398          *
 399          * @param $x Mixed: FIXME
 400          */
 401         function forUpdate( $x = NULL ) {
 402                 return wfSetVar( $this->mForUpdate, $x );
 403         }
 404
 405         /**
 406          * Get the database which should be used for reads
 407          *
 408          * @return Database
 409          */
 410         function getDB() {
 411                 return wfGetDB( DB_MASTER );
 412         }
 413
 414         /**
 415          * Get options for all SELECT statements
 416          *
 417          * @param $options Array: an optional options array which'll be appended to
 418          *                       the default
 419          * @return Array: options
 420          */
 421         function getSelectOptions( $options = '' ) {
 422                 if ( $this->mForUpdate ) {
 423                         if ( is_array( $options ) ) {
 424                                 $options[] = 'FOR UPDATE';
 425                         } else {
 426                                 $options = 'FOR UPDATE';
 427                         }
 428                 }
 429                 return $options;
 430         }
 431
 432         /**
 433          * @return int Page ID
 434          */
 435         function getID() {
 436                 if( $this->mTitle ) {
 437                         return $this->mTitle->getArticleID();
 438                 } else {
 439                         return 0;
 440                 }
 441         }
 442
 443         /**
 444          * @return bool Whether or not the page exists in the database
 445          */
 446         function exists() {
 447                 return $this->getId() != 0;
 448         }
 449
 450         /**
 451          * @return int The view count for the page
 452          */
 453         function getCount() {
 454                 if ( -1 == $this->mCounter ) {
 455                         $id = $this->getID();
 456                         if ( $id == 0 ) {
 457                                 $this->mCounter = 0;
 458                         } else {
 459                                 $dbr = wfGetDB( DB_SLAVE );
 460                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 461                                         'Article::getCount', $this->getSelectOptions() );
 462                         }
 463                 }
 464                 return $this->mCounter;
 465         }
 466
 467         /**
 468          * Determine whether a page  would be suitable for being counted as an
 469          * article in the site_stats table based on the title & its content
 470          *
 471          * @param $text String: text to analyze
 472          * @return bool
 473          */
 474         function isCountable( $text ) {
 475                 global $wgUseCommaCount;
 476
 477                 $token = $wgUseCommaCount ? ',' : '[[';
 478                 return
 479                         $this->mTitle->isContentPage()
 480                         && !$this->isRedirect( $text )
 481                         && in_string( $token, $text );
 482         }
 483
 484         /**
 485          * Tests if the article text represents a redirect
 486          *
 487          * @param $text String: FIXME
 488          * @return bool
 489          */
 490         function isRedirect( $text = false ) {
 491                 if ( $text === false ) {
 492                         $this->loadContent();
 493                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 494                 } else {
 495                         $titleObj = Title::newFromRedirect( $text );
 496                 }
 497                 return $titleObj !== NULL;
 498         }
 499
 500         /**
 501          * Returns true if the currently-referenced revision is the current edit
 502          * to this page (and it exists).
 503          * @return bool
 504          */
 505         function isCurrent() {
 506                 # If no oldid, this is the current version.
 507                 if ($this->getOldID() == 0)
 508                         return true;
 509
 510                 return $this->exists() &&
 511                         isset( $this->mRevision ) &&
 512                         $this->mRevision->isCurrent();
 513         }
 514
 515         /**
 516          * Loads everything except the text
 517          * This isn't necessary for all uses, so it's only done if needed.
 518          * @private
 519          */
 520         function loadLastEdit() {
 521                 if ( -1 != $this->mUser )
 522                         return;
 523
 524                 # New or non-existent articles have no user information
 525                 $id = $this->getID();
 526                 if ( 0 == $id ) return;
 527
 528                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 529                 if( !is_null( $this->mLastRevision ) ) {
 530                         $this->mUser      = $this->mLastRevision->getUser();
 531                         $this->mUserText  = $this->mLastRevision->getUserText();
 532                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 533                         $this->mComment   = $this->mLastRevision->getComment();
 534                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 535                         $this->mRevIdFetched = $this->mLastRevision->getID();
 536                 }
 537         }
 538
 539         function getTimestamp() {
 540                 // Check if the field has been filled by ParserCache::get()
 541                 if ( !$this->mTimestamp ) {
 542                         $this->loadLastEdit();
 543                 }
 544                 return wfTimestamp(TS_MW, $this->mTimestamp);
 545         }
 546
 547         function getUser() {
 548                 $this->loadLastEdit();
 549                 return $this->mUser;
 550         }
 551
 552         function getUserText() {
 553                 $this->loadLastEdit();
 554                 return $this->mUserText;
 555         }
 556
 557         function getComment() {
 558                 $this->loadLastEdit();
 559                 return $this->mComment;
 560         }
 561
 562         function getMinorEdit() {
 563                 $this->loadLastEdit();
 564                 return $this->mMinorEdit;
 565         }
 566
 567         function getRevIdFetched() {
 568                 $this->loadLastEdit();
 569                 return $this->mRevIdFetched;
 570         }
 571
 572         /**
 573          * @todo Document, fixme $offset never used.
 574          * @param $limit Integer: default 0.
 575          * @param $offset Integer: default 0.
 576          */
 577         function getContributors($limit = 0, $offset = 0) {
 578                 # XXX: this is expensive; cache this info somewhere.
 579
 580                 $contribs = array();
 581                 $dbr = wfGetDB( DB_SLAVE );
 582                 $revTable = $dbr->tableName( 'revision' );
 583                 $userTable = $dbr->tableName( 'user' );
 584                 $user = $this->getUser();
 585                 $pageId = $this->getId();
 586
 587                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 588                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 589                         WHERE rev_page = $pageId
 590                         AND rev_user != $user
 591                         GROUP BY rev_user, rev_user_text, user_real_name
 592                         ORDER BY timestamp DESC";
 593
 594                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 595                 $sql .= ' '. $this->getSelectOptions();
 596
 597                 $res = $dbr->query($sql, __METHOD__);
 598
 599                 while ( $line = $dbr->fetchObject( $res ) ) {
 600                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 601                 }
 602
 603                 $dbr->freeResult($res);
 604                 return $contribs;
 605         }
 606
 607         /**
 608          * This is the default action of the script: just view the page of
 609          * the given title.
 610         */
 611         function view() {
 612                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 613                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 614                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 615                 $sk = $wgUser->getSkin();
 616
 617                 wfProfileIn( __METHOD__ );
 618
 619                 $parserCache =& ParserCache::singleton();
 620                 $ns = $this->mTitle->getNamespace(); # shortcut
 621
 622                 # Get variables from query string
 623                 $oldid = $this->getOldID();
 624
 625                 # getOldID may want us to redirect somewhere else
 626                 if ( $this->mRedirectUrl ) {
 627                         $wgOut->redirect( $this->mRedirectUrl );
 628                         wfProfileOut( __METHOD__ );
 629                         return;
 630                 }
 631
 632                 $diff = $wgRequest->getVal( 'diff' );
 633                 $rcid = $wgRequest->getVal( 'rcid' );
 634                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 635                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 636
 637                 $wgOut->setArticleFlag( true );
 638
 639                 # Discourage indexing of printable versions, but encourage following
 640                 if( $wgOut->isPrintable() ) {
 641                         $policy = 'noindex,follow';
 642                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 643                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 644                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 645                         # Honour customised robot policies for this namespace
 646                         $policy = $wgNamespaceRobotPolicies[$ns];
 647                 } else {
 648                         # Default to encourage indexing and following links
 649                         $policy = 'index,follow';
 650                 }
 651                 $wgOut->setRobotPolicy( $policy );
 652
 653                 # If we got diff and oldid in the query, we want to see a
 654                 # diff page instead of the article.
 655
 656                 if ( !is_null( $diff ) ) {
 657                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 658
 659                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 660                         // DifferenceEngine directly fetched the revision:
 661                         $this->mRevIdFetched = $de->mNewid;
 662                         $de->showDiffPage( $diffOnly );
 663
 664                         // Needed to get the page's current revision
 665                         $this->loadPageData();
 666                         if( $diff == 0 || $diff == $this->mLatest ) {
 667                                 # Run view updates for current revision only
 668                                 $this->viewUpdates();
 669                         }
 670                         wfProfileOut( __METHOD__ );
 671                         return;
 672                 }
 673
 674                 if ( empty( $oldid ) && $this->checkTouched() ) {
 675                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 676
 677                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 678                                 wfProfileOut( __METHOD__ );
 679                                 return;
 680                         } else if ( $this->tryFileCache() ) {
 681                                 # tell wgOut that output is taken care of
 682                                 $wgOut->disable();
 683                                 $this->viewUpdates();
 684                                 wfProfileOut( __METHOD__ );
 685                                 return;
 686                         }
 687                 }
 688
 689                 # Should the parser cache be used?
 690                 $pcache = $wgEnableParserCache &&
 691                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 692                         $this->exists() &&
 693                         empty( $oldid );
 694                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 695                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 696                         wfIncrStats( 'pcache_miss_stub' );
 697                 }
 698
 699                 $wasRedirected = false;
 700                 if ( isset( $this->mRedirectedFrom ) ) {
 701                         // This is an internally redirected page view.
 702                         // We'll need a backlink to the source page for navigation.
 703                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 704                                 $sk = $wgUser->getSkin();
 705                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 706                                 $s = wfMsg( 'redirectedfrom', $redir );
 707                                 $wgOut->setSubtitle( $s );
 708
 709                                 // Set the fragment if one was specified in the redirect
 710                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 711                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 712                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 713                                 }
 714                                 $wasRedirected = true;
 715                         }
 716                 } elseif ( !empty( $rdfrom ) ) {
 717                         // This is an externally redirected view, from some other wiki.
 718                         // If it was reported from a trusted site, supply a backlink.
 719                         global $wgRedirectSources;
 720                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 721                                 $sk = $wgUser->getSkin();
 722                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 723                                 $s = wfMsg( 'redirectedfrom', $redir );
 724                                 $wgOut->setSubtitle( $s );
 725                                 $wasRedirected = true;
 726                         }
 727                 }
 728
 729                 $outputDone = false;
 730                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 731                 if ( $pcache ) {
 732                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 733                                 // Ensure that UI elements requiring revision ID have
 734                                 // the correct version information.
 735                                 $wgOut->setRevisionId( $this->mLatest );
 736                                 $outputDone = true;
 737                         }
 738                 }
 739                 if ( !$outputDone ) {
 740                         $text = $this->getContent();
 741                         if ( $text === false ) {
 742                                 # Failed to load, replace text with error message
 743                                 $t = $this->mTitle->getPrefixedText();
 744                                 if( $oldid ) {
 745                                         $t .= ',oldid='.$oldid;
 746                                         $text = wfMsg( 'missingarticle', $t );
 747                                 } else {
 748                                         $text = wfMsg( 'noarticletext', $t );
 749                                 }
 750                         }
 751
 752                         # Another whitelist check in case oldid is altering the title
 753                         if ( !$this->mTitle->userCanRead() ) {
 754                                 $wgOut->loginToUse();
 755                                 $wgOut->output();
 756                                 exit;
 757                         }
 758
 759                         # We're looking at an old revision
 760
 761                         if ( !empty( $oldid ) ) {
 762                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 763                                 if( is_null( $this->mRevision ) ) {
 764                                         // FIXME: This would be a nice place to load the 'no such page' text.
 765                                 } else {
 766                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 767                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 768                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 769                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 770                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 771                                                         return;
 772                                                 } else {
 773                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 774                                                         // and we are allowed to see...
 775                                                 }
 776                                         }
 777                                 }
 778
 779                         }
 780                 }
 781                 if( !$outputDone ) {
 782                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 783                         // Wrap site/user css/js in pre and don't parse.  User pages need
 784                         // to be subpages, site pages just need to end in ".css" or ".js".
 785
 786                         // @todo: use $this->mTitle->isCssJsSubpage() when php is fixed/
 787                         // a workaround is found.
 788                         if (
 789                                 ($ns == NS_USER and preg_match('#/\w+\.(css|js)$#',$this->mTitle->getDBkey(),$matches))
 790                                 or ($ns == NS_MEDIAWIKI and preg_match('/.(css|js)$/', $this->mTitle->getDBkey(), $matches))
 791                         ) {
 792                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 793                                 $wgOut->addHTML(
 794                                         "<pre class=\"mw-code mw-{$matches[1]}\" dir=\"ltr\">"
 795                                         .htmlspecialchars($this->mContent)."\n</pre>"
 796                                 );
 797                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 798                                 # Display redirect
 799                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 800                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 801                                 # Don't overwrite the subtitle if this was an old revision
 802                                 if( !$wasRedirected && $this->isCurrent() ) {
 803                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 804                                 }
 805                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 806
 807                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 808                                   '<span class="redirectText">'.$link.'</span>' );
 809
 810                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 811                                 $wgOut->addParserOutputNoText( $parseout );
 812                         } else if ( $pcache ) {
 813                                 # Display content and save to parser cache
 814                                 $this->outputWikiText( $text );
 815                         } else {
 816                                 # Display content, don't attempt to save to parser cache
 817                                 # Don't show section-edit links on old revisions... this way lies madness.
 818                                 if( !$this->isCurrent() ) {
 819                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 820                                 }
 821                                 # Display content and don't save to parser cache
 822                                 # With timing hack -- TS 2006-07-26
 823                                 $time = -wfTime();
 824                                 $this->outputWikiText( $text, false );
 825                                 $time += wfTime();
 826
 827                                 # Timing hack
 828                                 if ( $time > 3 ) {
 829                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 830                                                 $this->mTitle->getPrefixedDBkey()));
 831                                 }
 832
 833                                 if( !$this->isCurrent() ) {
 834                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 835                                 }
 836
 837                         }
 838                 }
 839                 /* title may have been set from the cache */
 840                 $t = $wgOut->getPageTitle();
 841                 if( empty( $t ) ) {
 842                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 843                 }
 844
 845                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 846                 if( $ns == NS_USER_TALK &&
 847                         User::isIP( $this->mTitle->getText() ) ) {
 848                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 849                 }
 850
 851                 # If we have been passed an &rcid= parameter, we want to give the user a
 852                 # chance to mark this new article as patrolled.
 853                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 854                         $wgOut->addHTML(
 855                                 "<div class='patrollink'>" .
 856                                         wfMsgHtml( 'markaspatrolledlink',
 857                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 858                                                 "action=markpatrolled&rcid=$rcid" )
 859                                         ) .
 860                                 '</div>'
 861                          );
 862                 }
 863
 864                 # Trackbacks
 865                 if ($wgUseTrackbacks)
 866                         $this->addTrackbacks();
 867
 868                 $this->viewUpdates();
 869                 wfProfileOut( __METHOD__ );
 870         }
 871
 872         function addTrackbacks() {
 873                 global $wgOut, $wgUser;
 874
 875                 $dbr = wfGetDB(DB_SLAVE);
 876                 $tbs = $dbr->select(
 877                                 /* FROM   */ 'trackbacks',
 878                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 879                                 /* WHERE  */ array('tb_page' => $this->getID())
 880                 );
 881
 882                 if (!$dbr->numrows($tbs))
 883                         return;
 884
 885                 $tbtext = "";
 886                 while ($o = $dbr->fetchObject($tbs)) {
 887                         $rmvtxt = "";
 888                         if ($wgUser->isAllowed( 'trackback' )) {
 889                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 890                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 891                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 892                         }
 893                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 894                                         $o->tb_title,
 895                                         $o->tb_url,
 896                                         $o->tb_ex,
 897                                         $o->tb_name,
 898                                         $rmvtxt);
 899                 }
 900                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 901         }
 902
 903         function deletetrackback() {
 904                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 905
 906                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 907                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 908                         return;
 909                 }
 910
 911                 if ((!$wgUser->isAllowed('delete'))) {
 912                         $wgOut->permissionRequired( 'delete' );
 913                         return;
 914                 }
 915
 916                 if (wfReadOnly()) {
 917                         $wgOut->readOnlyPage();
 918                         return;
 919                 }
 920
 921                 $db = wfGetDB(DB_MASTER);
 922                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 923                 $wgTitle->invalidateCache();
 924                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 925         }
 926
 927         function render() {
 928                 global $wgOut;
 929
 930                 $wgOut->setArticleBodyOnly(true);
 931                 $this->view();
 932         }
 933
 934         /**
 935          * Handle action=purge
 936          */
 937         function purge() {
 938                 global $wgUser, $wgRequest, $wgOut;
 939
 940                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 941                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 942                                 $this->doPurge();
 943                         }
 944                 } else {
 945                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 946                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 947                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 948                         $msg = str_replace( '$1',
 949                                 "<form method=\"post\" action=\"$action\">\n" .
 950                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 951                                 "</form>\n", $msg );
 952
 953                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 954                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 955                         $wgOut->addHTML( $msg );
 956                 }
 957         }
 958
 959         /**
 960          * Perform the actions of a page purging
 961          */
 962         function doPurge() {
 963                 global $wgUseSquid;
 964                 // Invalidate the cache
 965                 $this->mTitle->invalidateCache();
 966
 967                 if ( $wgUseSquid ) {
 968                         // Commit the transaction before the purge is sent
 969                         $dbw = wfGetDB( DB_MASTER );
 970                         $dbw->immediateCommit();
 971
 972                         // Send purge
 973                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 974                         $update->doUpdate();
 975                 }
 976                 $this->view();
 977         }
 978
 979         /**
 980          * Insert a new empty page record for this article.
 981          * This *must* be followed up by creating a revision
 982          * and running $this->updateToLatest( $rev_id );
 983          * or else the record will be left in a funky state.
 984          * Best if all done inside a transaction.
 985          *
 986          * @param Database $dbw
 987          * @return int     The newly created page_id key
 988          * @private
 989          */
 990         function insertOn( $dbw ) {
 991                 wfProfileIn( __METHOD__ );
 992
 993                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 994                 $dbw->insert( 'page', array(
 995                         'page_id'           => $page_id,
 996                         'page_namespace'    => $this->mTitle->getNamespace(),
 997                         'page_title'        => $this->mTitle->getDBkey(),
 998                         'page_counter'      => 0,
 999                         'page_restrictions' => '',
1000                         'page_is_redirect'  => 0, # Will set this shortly...
1001                         'page_is_new'       => 1,
1002                         'page_random'       => wfRandom(),
1003                         'page_touched'      => $dbw->timestamp(),
1004                         'page_latest'       => 0, # Fill this in shortly...
1005                         'page_len'          => 0, # Fill this in shortly...
1006                 ), __METHOD__ );
1007                 $newid = $dbw->insertId();
1008
1009                 $this->mTitle->resetArticleId( $newid );
1010
1011                 wfProfileOut( __METHOD__ );
1012                 return $newid;
1013         }
1014
1015         /**
1016          * Update the page record to point to a newly saved revision.
1017          *
1018          * @param Database $dbw
1019          * @param Revision $revision For ID number, and text used to set
1020                                      length and redirect status fields
1021          * @param int $lastRevision If given, will not overwrite the page field
1022          *                          when different from the currently set value.
1023          *                          Giving 0 indicates the new page flag should
1024          *                          be set on.
1025          * @param bool $lastRevIsRedirect If given, will optimize adding and
1026          *                                                      removing rows in redirect table.
1027          * @return bool true on success, false on failure
1028          * @private
1029          */
1030         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1031                 wfProfileIn( __METHOD__ );
1032
1033                 $text = $revision->getText();
1034                 $rt = Title::newFromRedirect( $text );
1035
1036                 $conditions = array( 'page_id' => $this->getId() );
1037                 if( !is_null( $lastRevision ) ) {
1038                         # An extra check against threads stepping on each other
1039                         $conditions['page_latest'] = $lastRevision;
1040                 }
1041
1042                 $dbw->update( 'page',
1043                         array( /* SET */
1044                                 'page_latest'      => $revision->getId(),
1045                                 'page_touched'     => $dbw->timestamp(),
1046                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1047                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1048                                 'page_len'         => strlen( $text ),
1049                         ),
1050                         $conditions,
1051                         __METHOD__ );
1052
1053                 $result = $dbw->affectedRows() != 0;
1054
1055                 if ($result) {
1056                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1057                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1058                 }
1059
1060                 wfProfileOut( __METHOD__ );
1061                 return $result;
1062         }
1063
1064         /**
1065          * Add row to the redirect table if this is a redirect, remove otherwise.
1066          *
1067          * @param Database $dbw
1068          * @param $redirectTitle a title object pointing to the redirect target,
1069          *                                                      or NULL if this is not a redirect
1070          * @param bool $lastRevIsRedirect If given, will optimize adding and
1071          *                                                      removing rows in redirect table.
1072          * @return bool true on success, false on failure
1073          * @private
1074          */
1075         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1076
1077                 // Always update redirects (target link might have changed)
1078                 // Update/Insert if we don't know if the last revision was a redirect or not
1079                 // Delete if changing from redirect to non-redirect
1080                 $isRedirect = !is_null($redirectTitle);
1081                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1082
1083                         wfProfileIn( __METHOD__ );
1084
1085                         if ($isRedirect) {
1086
1087                                 // This title is a redirect, Add/Update row in the redirect table
1088                                 $set = array( /* SET */
1089                                         'rd_namespace' => $redirectTitle->getNamespace(),
1090                                         'rd_title'     => $redirectTitle->getDBkey(),
1091                                         'rd_from'      => $this->getId(),
1092                                 );
1093
1094                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1095                         } else {
1096                                 // This is not a redirect, remove row from redirect table
1097                                 $where = array( 'rd_from' => $this->getId() );
1098                                 $dbw->delete( 'redirect', $where, __METHOD__);
1099                         }
1100
1101                         wfProfileOut( __METHOD__ );
1102                         return ( $dbw->affectedRows() != 0 );
1103                 }
1104
1105                 return true;
1106         }
1107
1108         /**
1109          * If the given revision is newer than the currently set page_latest,
1110          * update the page record. Otherwise, do nothing.
1111          *
1112          * @param Database $dbw
1113          * @param Revision $revision
1114          */
1115         function updateIfNewerOn( &$dbw, $revision ) {
1116                 wfProfileIn( __METHOD__ );
1117
1118                 $row = $dbw->selectRow(
1119                         array( 'revision', 'page' ),
1120                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1121                         array(
1122                                 'page_id' => $this->getId(),
1123                                 'page_latest=rev_id' ),
1124                         __METHOD__ );
1125                 if( $row ) {
1126                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1127                                 wfProfileOut( __METHOD__ );
1128                                 return false;
1129                         }
1130                         $prev = $row->rev_id;
1131                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1132                 } else {
1133                         # No or missing previous revision; mark the page as new
1134                         $prev = 0;
1135                         $lastRevIsRedirect = null;
1136                 }
1137
1138                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1139                 wfProfileOut( __METHOD__ );
1140                 return $ret;
1141         }
1142
1143         /**
1144          * @return string Complete article text, or null if error
1145          */
1146         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1147                 wfProfileIn( __METHOD__ );
1148
1149                 if( $section == '' ) {
1150                         // Whole-page edit; let the text through unmolested.
1151                 } else {
1152                         if( is_null( $edittime ) ) {
1153                                 $rev = Revision::newFromTitle( $this->mTitle );
1154                         } else {
1155                                 $dbw = wfGetDB( DB_MASTER );
1156                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1157                         }
1158                         if( is_null( $rev ) ) {
1159                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1160                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1161                                 return null;
1162                         }
1163                         $oldtext = $rev->getText();
1164
1165                         if( $section == 'new' ) {
1166                                 # Inserting a new section
1167                                 $subject = $summary ? "== {$summary} ==\n\n" : '';
1168                                 $text = strlen( trim( $oldtext ) ) > 0
1169                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1170                                                 : "{$subject}{$text}";
1171                         } else {
1172                                 # Replacing an existing section; roll out the big guns
1173                                 global $wgParser;
1174                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1175                         }
1176
1177                 }
1178
1179                 wfProfileOut( __METHOD__ );
1180                 return $text;
1181         }
1182
1183         /**
1184          * @deprecated use Article::doEdit()
1185          */
1186         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1187                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1188                         ( $isminor ? EDIT_MINOR : 0 ) |
1189                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1190
1191                 # If this is a comment, add the summary as headline
1192                 if ( $comment && $summary != "" ) {
1193                         $text = "== {$summary} ==\n\n".$text;
1194                 }
1195
1196                 $this->doEdit( $text, $summary, $flags );
1197
1198                 $dbw = wfGetDB( DB_MASTER );
1199                 if ($watchthis) {
1200                         if (!$this->mTitle->userIsWatching()) {
1201                                 $dbw->begin();
1202                                 $this->doWatch();
1203                                 $dbw->commit();
1204                         }
1205                 } else {
1206                         if ( $this->mTitle->userIsWatching() ) {
1207                                 $dbw->begin();
1208                                 $this->doUnwatch();
1209                                 $dbw->commit();
1210                         }
1211                 }
1212                 $this->doRedirect( $this->isRedirect( $text ) );
1213         }
1214
1215         /**
1216          * @deprecated use Article::doEdit()
1217          */
1218         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1219                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1220                         ( $minor ? EDIT_MINOR : 0 ) |
1221                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1222
1223                 $good = $this->doEdit( $text, $summary, $flags );
1224                 if ( $good ) {
1225                         $dbw = wfGetDB( DB_MASTER );
1226                         if ($watchthis) {
1227                                 if (!$this->mTitle->userIsWatching()) {
1228                                         $dbw->begin();
1229                                         $this->doWatch();
1230                                         $dbw->commit();
1231                                 }
1232                         } else {
1233                                 if ( $this->mTitle->userIsWatching() ) {
1234                                         $dbw->begin();
1235                                         $this->doUnwatch();
1236                                         $dbw->commit();
1237                                 }
1238                         }
1239
1240                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1241                 }
1242                 return $good;
1243         }
1244
1245         /**
1246          * Article::doEdit()
1247          *
1248          * Change an existing article or create a new article. Updates RC and all necessary caches,
1249          * optionally via the deferred update array.
1250          *
1251          * $wgUser must be set before calling this function.
1252          *
1253          * @param string $text New text
1254          * @param string $summary Edit summary
1255          * @param integer $flags bitfield:
1256          *      EDIT_NEW
1257          *          Article is known or assumed to be non-existent, create a new one
1258          *      EDIT_UPDATE
1259          *          Article is known or assumed to be pre-existing, update it
1260          *      EDIT_MINOR
1261          *          Mark this edit minor, if the user is allowed to do so
1262          *      EDIT_SUPPRESS_RC
1263          *          Do not log the change in recentchanges
1264          *      EDIT_FORCE_BOT
1265          *          Mark the edit a "bot" edit regardless of user rights
1266          *      EDIT_DEFER_UPDATES
1267          *          Defer some of the updates until the end of index.php
1268          *      EDIT_AUTOSUMMARY
1269          *          Fill in blank summaries with generated text where possible
1270          *
1271          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1272          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1273          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1274          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1275          * to MediaWiki's performance-optimised locking strategy.
1276          *
1277          * @return bool success
1278          */
1279         function doEdit( $text, $summary, $flags = 0 ) {
1280                 global $wgUser, $wgDBtransactions;
1281
1282                 wfProfileIn( __METHOD__ );
1283                 $good = true;
1284
1285                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1286                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1287                         if ( $aid ) {
1288                                 $flags |= EDIT_UPDATE;
1289                         } else {
1290                                 $flags |= EDIT_NEW;
1291                         }
1292                 }
1293
1294                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1295                         &$summary, $flags & EDIT_MINOR,
1296                         null, null, &$flags ) ) )
1297                 {
1298                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1299                         wfProfileOut( __METHOD__ );
1300                         return false;
1301                 }
1302
1303                 # Silently ignore EDIT_MINOR if not allowed
1304                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1305                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1306
1307                 $oldtext = $this->getContent();
1308                 $oldsize = strlen( $oldtext );
1309
1310                 # Provide autosummaries if one is not provided.
1311                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1312                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1313
1314                 $text = $this->preSaveTransform( $text );
1315                 $newsize = strlen( $text );
1316
1317                 $dbw = wfGetDB( DB_MASTER );
1318                 $now = wfTimestampNow();
1319
1320                 if ( $flags & EDIT_UPDATE ) {
1321                         # Update article, but only if changed.
1322
1323                         # Make sure the revision is either completely inserted or not inserted at all
1324                         if( !$wgDBtransactions ) {
1325                                 $userAbort = ignore_user_abort( true );
1326                         }
1327
1328                         $lastRevision = 0;
1329                         $revisionId = 0;
1330
1331                         if ( 0 != strcmp( $text, $oldtext ) ) {
1332                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1333                                   - (int)$this->isCountable( $oldtext );
1334                                 $this->mTotalAdjustment = 0;
1335
1336                                 $lastRevision = $dbw->selectField(
1337                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1338
1339                                 if ( !$lastRevision ) {
1340                                         # Article gone missing
1341                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1342                                         wfProfileOut( __METHOD__ );
1343                                         return false;
1344                                 }
1345
1346                                 $revision = new Revision( array(
1347                                         'page'       => $this->getId(),
1348                                         'comment'    => $summary,
1349                                         'minor_edit' => $isminor,
1350                                         'text'       => $text
1351                                         ) );
1352
1353                                 $dbw->begin();
1354                                 $revisionId = $revision->insertOn( $dbw );
1355
1356                                 # Update page
1357                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1358
1359                                 if( !$ok ) {
1360                                         /* Belated edit conflict! Run away!! */
1361                                         $good = false;
1362                                         $dbw->rollback();
1363                                 } else {
1364                                         # Update recentchanges
1365                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1366                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1367                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1368                                                         $revisionId );
1369
1370                                                 # Mark as patrolled if the user can do so
1371                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1372                                                         RecentChange::markPatrolled( $rcid );
1373                                                         PatrolLog::record( $rcid, true );
1374                                                 }
1375                                         }
1376                                         $wgUser->incEditCount();
1377                                         $dbw->commit();
1378                                 }
1379                         } else {
1380                                 // Keep the same revision ID, but do some updates on it
1381                                 $revisionId = $this->getRevIdFetched();
1382                                 // Update page_touched, this is usually implicit in the page update
1383                                 // Other cache updates are done in onArticleEdit()
1384                                 $this->mTitle->invalidateCache();
1385                         }
1386
1387                         if( !$wgDBtransactions ) {
1388                                 ignore_user_abort( $userAbort );
1389                         }
1390
1391                         if ( $good ) {
1392                                 # Invalidate cache of this article and all pages using this article
1393                                 # as a template. Partly deferred.
1394                                 Article::onArticleEdit( $this->mTitle );
1395
1396                                 # Update links tables, site stats, etc.
1397                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1398                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1399                         }
1400                 } else {
1401                         # Create new article
1402
1403                         # Set statistics members
1404                         # We work out if it's countable after PST to avoid counter drift
1405                         # when articles are created with {{subst:}}
1406                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1407                         $this->mTotalAdjustment = 1;
1408
1409                         $dbw->begin();
1410
1411                         # Add the page record; stake our claim on this title!
1412                         # This will fail with a database query exception if the article already exists
1413                         $newid = $this->insertOn( $dbw );
1414
1415                         # Save the revision text...
1416                         $revision = new Revision( array(
1417                                 'page'       => $newid,
1418                                 'comment'    => $summary,
1419                                 'minor_edit' => $isminor,
1420                                 'text'       => $text
1421                                 ) );
1422                         $revisionId = $revision->insertOn( $dbw );
1423
1424                         $this->mTitle->resetArticleID( $newid );
1425
1426                         # Update the page record with revision data
1427                         $this->updateRevisionOn( $dbw, $revision, 0 );
1428
1429                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1430                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1431                                   '', strlen( $text ), $revisionId );
1432                                 # Mark as patrolled if the user can
1433                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1434                                         RecentChange::markPatrolled( $rcid );
1435                                         PatrolLog::record( $rcid, true );
1436                                 }
1437                         }
1438                         $wgUser->incEditCount();
1439                         $dbw->commit();
1440
1441                         # Update links, etc.
1442                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1443
1444                         # Clear caches
1445                         Article::onArticleCreate( $this->mTitle );
1446
1447                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1448                                 $summary, $flags & EDIT_MINOR,
1449                                 null, null, &$flags ) );
1450                 }
1451
1452                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1453                         wfDoUpdates();
1454                 }
1455
1456                 wfRunHooks( 'ArticleSaveComplete',
1457                         array( &$this, &$wgUser, $text,
1458                         $summary, $flags & EDIT_MINOR,
1459                         null, null, &$flags ) );
1460
1461                 wfProfileOut( __METHOD__ );
1462                 return $good;
1463         }
1464
1465         /**
1466          * @deprecated wrapper for doRedirect
1467          */
1468         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1469                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1470         }
1471
1472         /**
1473          * Output a redirect back to the article.
1474          * This is typically used after an edit.
1475          *
1476          * @param boolean $noRedir Add redirect=no
1477          * @param string $sectionAnchor section to redirect to, including "#"
1478          */
1479         function doRedirect( $noRedir = false, $sectionAnchor = '' ) {
1480                 global $wgOut;
1481                 if ( $noRedir ) {
1482                         $query = 'redirect=no';
1483                 } else {
1484                         $query = '';
1485                 }
1486                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1487         }
1488
1489         /**
1490          * Mark this particular edit as patrolled
1491          */
1492         function markpatrolled() {
1493                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1494                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1495
1496                 # Check RC patrol config. option
1497                 if( !$wgUseRCPatrol ) {
1498                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1499                         return;
1500                 }
1501
1502                 # Check permissions
1503                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1504                         $wgOut->permissionRequired( 'patrol' );
1505                         return;
1506                 }
1507
1508                 # If we haven't been given an rc_id value, we can't do anything
1509                 $rcid = $wgRequest->getVal( 'rcid' );
1510                 if( !$rcid ) {
1511                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1512                         return;
1513                 }
1514
1515                 # Handle the 'MarkPatrolled' hook
1516                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1517                         return;
1518                 }
1519
1520                 $return = SpecialPage::getTitleFor( 'Recentchanges' );
1521                 # If it's left up to us, check that the user is allowed to patrol this edit
1522                 # If the user has the "autopatrol" right, then we'll assume there are no
1523                 # other conditions stopping them doing so
1524                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1525                         $rc = RecentChange::newFromId( $rcid );
1526                         # Graceful error handling, as we've done before here...
1527                         # (If the recent change doesn't exist, then it doesn't matter whether
1528                         # the user is allowed to patrol it or not; nothing is going to happen
1529                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1530                                 # The user made this edit, and can't patrol it
1531                                 # Tell them so, and then back off
1532                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1533                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1534                                 $wgOut->returnToMain( false, $return );
1535                                 return;
1536                         }
1537                 }
1538
1539                 # Mark the edit as patrolled
1540                 RecentChange::markPatrolled( $rcid );
1541                 PatrolLog::record( $rcid );
1542                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1543
1544                 # Inform the user
1545                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1546                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1547                 $wgOut->returnToMain( false, $return );
1548         }
1549
1550         /**
1551          * User-interface handler for the "watch" action
1552          */
1553
1554         function watch() {
1555
1556                 global $wgUser, $wgOut;
1557
1558                 if ( $wgUser->isAnon() ) {
1559                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1560                         return;
1561                 }
1562                 if ( wfReadOnly() ) {
1563                         $wgOut->readOnlyPage();
1564                         return;
1565                 }
1566
1567                 if( $this->doWatch() ) {
1568                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1569                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1570
1571                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1572                         $text = wfMsg( 'addedwatchtext', $link );
1573                         $wgOut->addWikiText( $text );
1574                 }
1575
1576                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1577         }
1578
1579         /**
1580          * Add this page to $wgUser's watchlist
1581          * @return bool true on successful watch operation
1582          */
1583         function doWatch() {
1584                 global $wgUser;
1585                 if( $wgUser->isAnon() ) {
1586                         return false;
1587                 }
1588
1589                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1590                         $wgUser->addWatch( $this->mTitle );
1591
1592                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1593                 }
1594
1595                 return false;
1596         }
1597
1598         /**
1599          * User interface handler for the "unwatch" action.
1600          */
1601         function unwatch() {
1602
1603                 global $wgUser, $wgOut;
1604
1605                 if ( $wgUser->isAnon() ) {
1606                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1607                         return;
1608                 }
1609                 if ( wfReadOnly() ) {
1610                         $wgOut->readOnlyPage();
1611                         return;
1612                 }
1613
1614                 if( $this->doUnwatch() ) {
1615                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1616                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1617
1618                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1619                         $text = wfMsg( 'removedwatchtext', $link );
1620                         $wgOut->addWikiText( $text );
1621                 }
1622
1623                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1624         }
1625
1626         /**
1627          * Stop watching a page
1628          * @return bool true on successful unwatch
1629          */
1630         function doUnwatch() {
1631                 global $wgUser;
1632                 if( $wgUser->isAnon() ) {
1633                         return false;
1634                 }
1635
1636                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1637                         $wgUser->removeWatch( $this->mTitle );
1638
1639                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1640                 }
1641
1642                 return false;
1643         }
1644
1645         /**
1646          * action=protect handler
1647          */
1648         function protect() {
1649                 $form = new ProtectionForm( $this );
1650                 $form->execute();
1651         }
1652
1653         /**
1654          * action=unprotect handler (alias)
1655          */
1656         function unprotect() {
1657                 $this->protect();
1658         }
1659
1660         /**
1661          * Update the article's restriction field, and leave a log entry.
1662          *
1663          * @param array $limit set of restriction keys
1664          * @param string $reason
1665          * @return bool true on success
1666          */
1667         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1668                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1669
1670                 $id = $this->mTitle->getArticleID();
1671                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1672                         return false;
1673                 }
1674
1675                 if (!$cascade) {
1676                         $cascade = false;
1677                 }
1678
1679                 // Take this opportunity to purge out expired restrictions
1680                 Title::purgeExpiredRestrictions();
1681
1682                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1683                 # we expect a single selection, but the schema allows otherwise.
1684                 $current = array();
1685                 foreach( $wgRestrictionTypes as $action )
1686                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1687
1688                 $current = Article::flattenRestrictions( $current );
1689                 $updated = Article::flattenRestrictions( $limit );
1690
1691                 $changed = ( $current != $updated );
1692                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1693                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1694                 $protect = ( $updated != '' );
1695
1696                 # If nothing's changed, do nothing
1697                 if( $changed ) {
1698                         global $wgGroupPermissions;
1699                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1700
1701                                 $dbw = wfGetDB( DB_MASTER );
1702
1703                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1704
1705                                 $expiry_description = '';
1706                                 if ( $encodedExpiry != 'infinity' ) {
1707                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1708                                 }
1709
1710                                 # Prepare a null revision to be added to the history
1711                                 $modified = $current != '' && $protect;
1712                                 if ( $protect ) {
1713                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1714                                 } else {
1715                                         $comment_type = 'unprotectedarticle';
1716                                 }
1717                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1718
1719                                 foreach( $limit as $action => $restrictions ) {
1720                                         # Check if the group level required to edit also can protect pages
1721                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1722                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1723                                 }
1724
1725                                 $cascade_description = '';
1726                                 if ($cascade) {
1727                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1728                                 }
1729
1730                                 if( $reason )
1731                                         $comment .= ": $reason";
1732                                 if( $protect )
1733                                         $comment .= " [$updated]";
1734                                 if ( $expiry_description && $protect )
1735                                         $comment .= "$expiry_description";
1736                                 if ( $cascade )
1737                                         $comment .= "$cascade_description";
1738
1739                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1740                                 $nullRevId = $nullRevision->insertOn( $dbw );
1741
1742                                 # Update restrictions table
1743                                 foreach( $limit as $action => $restrictions ) {
1744                                         if ($restrictions != '' ) {
1745                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1746                                                         array( 'pr_page' => $id, 'pr_type' => $action
1747                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1748                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1749                                         } else {
1750                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1751                                                         'pr_type' => $action ), __METHOD__ );
1752                                         }
1753                                 }
1754
1755                                 # Update page record
1756                                 $dbw->update( 'page',
1757                                         array( /* SET */
1758                                                 'page_touched' => $dbw->timestamp(),
1759                                                 'page_restrictions' => '',
1760                                                 'page_latest' => $nullRevId
1761                                         ), array( /* WHERE */
1762                                                 'page_id' => $id
1763                                         ), 'Article::protect'
1764                                 );
1765                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1766
1767                                 # Update the protection log
1768                                 $log = new LogPage( 'protect' );
1769
1770                                 if( $protect ) {
1771                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1772                                 } else {
1773                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1774                                 }
1775
1776                         } # End hook
1777                 } # End "changed" check
1778
1779                 return true;
1780         }
1781
1782         /**
1783          * Take an array of page restrictions and flatten it to a string
1784          * suitable for insertion into the page_restrictions field.
1785          * @param array $limit
1786          * @return string
1787          * @private
1788          */
1789         function flattenRestrictions( $limit ) {
1790                 if( !is_array( $limit ) ) {
1791                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1792                 }
1793                 $bits = array();
1794                 ksort( $limit );
1795                 foreach( $limit as $action => $restrictions ) {
1796                         if( $restrictions != '' ) {
1797                                 $bits[] = "$action=$restrictions";
1798                         }
1799                 }
1800                 return implode( ':', $bits );
1801         }
1802
1803         /*
1804          * UI entry point for page deletion
1805          */
1806         function delete() {
1807                 global $wgUser, $wgOut, $wgRequest;
1808                 $confirm = $wgRequest->wasPosted() &&
1809                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1810                 $reason = $wgRequest->getText( 'wpReason' );
1811
1812                 # This code desperately needs to be totally rewritten
1813
1814                 # Check permissions
1815                 if( $wgUser->isAllowed( 'delete' ) ) {
1816                         if( $wgUser->isBlocked( !$confirm ) ) {
1817                                 $wgOut->blockedPage();
1818                                 return;
1819                         }
1820                 } else {
1821                         $wgOut->permissionRequired( 'delete' );
1822                         return;
1823                 }
1824
1825                 if( wfReadOnly() ) {
1826                         $wgOut->readOnlyPage();
1827                         return;
1828                 }
1829
1830                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1831
1832                 # Better double-check that it hasn't been deleted yet!
1833                 $dbw = wfGetDB( DB_MASTER );
1834                 $conds = $this->mTitle->pageCond();
1835                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1836                 if ( $latest === false ) {
1837                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1838                         return;
1839                 }
1840
1841                 if( $confirm ) {
1842                         $this->doDelete( $reason );
1843                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1844                                 $this->doWatch();
1845                         } elseif( $this->mTitle->userIsWatching() ) {
1846                                 $this->doUnwatch();
1847                         }
1848                         return;
1849                 }
1850
1851                 # determine whether this page has earlier revisions
1852                 # and insert a warning if it does
1853                 $maxRevisions = 20;
1854                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1855
1856                 if( count( $authors ) > 1 && !$confirm ) {
1857                         $skin=$wgUser->getSkin();
1858                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1859                 }
1860
1861                 # If a single user is responsible for all revisions, find out who they are
1862                 if ( count( $authors ) == $maxRevisions ) {
1863                         // Query bailed out, too many revisions to find out if they're all the same
1864                         $authorOfAll = false;
1865                 } else {
1866                         $authorOfAll = reset( $authors );
1867                         foreach ( $authors as $author ) {
1868                                 if ( $authorOfAll != $author ) {
1869                                         $authorOfAll = false;
1870                                         break;
1871                                 }
1872                         }
1873                 }
1874                 # Fetch article text
1875                 $rev = Revision::newFromTitle( $this->mTitle );
1876
1877                 if( !is_null( $rev ) ) {
1878                         # if this is a mini-text, we can paste part of it into the deletion reason
1879                         $text = $rev->getText();
1880
1881                         #if this is empty, an earlier revision may contain "useful" text
1882                         $blanked = false;
1883                         if( $text == '' ) {
1884                                 $prev = $rev->getPrevious();
1885                                 if( $prev ) {
1886                                         $text = $prev->getText();
1887                                         $blanked = true;
1888                                 }
1889                         }
1890
1891                         $length = strlen( $text );
1892
1893                         # this should not happen, since it is not possible to store an empty, new
1894                         # page. Let's insert a standard text in case it does, though
1895                         if( $length == 0 && $reason === '' ) {
1896                                 $reason = wfMsgForContent( 'exblank' );
1897                         }
1898
1899                         if( $reason === '' ) {
1900                                 # comment field=255, let's grep the first 150 to have some user
1901                                 # space left
1902                                 global $wgContLang;
1903                                 $text = $wgContLang->truncate( $text, 150, '...' );
1904
1905                                 # let's strip out newlines
1906                                 $text = preg_replace( "/[\n\r]/", '', $text );
1907
1908                                 if( !$blanked ) {
1909                                         if( $authorOfAll === false ) {
1910                                                 $reason = wfMsgForContent( 'excontent', $text );
1911                                         } else {
1912                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1913                                         }
1914                                 } else {
1915                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1916                                 }
1917                         }
1918                 }
1919
1920                 return $this->confirmDelete( '', $reason );
1921         }
1922
1923         /**
1924          * Get the last N authors
1925          * @param int $num Number of revisions to get
1926          * @param string $revLatest The latest rev_id, selected from the master (optional)
1927          * @return array Array of authors, duplicates not removed
1928          */
1929         function getLastNAuthors( $num, $revLatest = 0 ) {
1930                 wfProfileIn( __METHOD__ );
1931
1932                 // First try the slave
1933                 // If that doesn't have the latest revision, try the master
1934                 $continue = 2;
1935                 $db = wfGetDB( DB_SLAVE );
1936                 do {
1937                         $res = $db->select( array( 'page', 'revision' ),
1938                                 array( 'rev_id', 'rev_user_text' ),
1939                                 array(
1940                                         'page_namespace' => $this->mTitle->getNamespace(),
1941                                         'page_title' => $this->mTitle->getDBkey(),
1942                                         'rev_page = page_id'
1943                                 ), __METHOD__, $this->getSelectOptions( array(
1944                                         'ORDER BY' => 'rev_timestamp DESC',
1945                                         'LIMIT' => $num
1946                                 ) )
1947                         );
1948                         if ( !$res ) {
1949                                 wfProfileOut( __METHOD__ );
1950                                 return array();
1951                         }
1952                         $row = $db->fetchObject( $res );
1953                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1954                                 $db = wfGetDB( DB_MASTER );
1955                                 $continue--;
1956                         } else {
1957                                 $continue = 0;
1958                         }
1959                 } while ( $continue );
1960
1961                 $authors = array( $row->rev_user_text );
1962                 while ( $row = $db->fetchObject( $res ) ) {
1963                         $authors[] = $row->rev_user_text;
1964                 }
1965                 wfProfileOut( __METHOD__ );
1966                 return $authors;
1967         }
1968
1969         /**
1970          * Output deletion confirmation dialog
1971          */
1972         function confirmDelete( $par, $reason ) {
1973                 global $wgOut, $wgUser;
1974
1975                 wfDebug( "Article::confirmDelete\n" );
1976
1977                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1978                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1979                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1980                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1981
1982                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1983
1984                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1985                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1986                 $token = htmlspecialchars( $wgUser->editToken() );
1987                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
1988
1989                 $wgOut->addHTML( "
1990 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1991         <table border='0'>
1992                 <tr>
1993                         <td align='right'>
1994                                 <label for='wpReason'>{$delcom}:</label>
1995                         </td>
1996                         <td align='left'>
1997                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"1\" />
1998                         </td>
1999                 </tr>
2000                 <tr>
2001                         <td>&nbsp;</td>
2002                         <td>$watch</td>
2003                 </tr>
2004                 <tr>
2005                         <td>&nbsp;</td>
2006                         <td>
2007                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
2008                         </td>
2009                 </tr>
2010         </table>
2011         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2012 </form>\n" );
2013
2014                 $wgOut->returnToMain( false );
2015
2016                 $this->showLogExtract( $wgOut );
2017         }
2018
2019
2020         /**
2021          * Show relevant lines from the deletion log
2022          */
2023         function showLogExtract( $out ) {
2024                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2025                 $logViewer = new LogViewer(
2026                         new LogReader(
2027                                 new FauxRequest(
2028                                         array( 'page' => $this->mTitle->getPrefixedText(),
2029                                                'type' => 'delete' ) ) ) );
2030                 $logViewer->showList( $out );
2031         }
2032
2033
2034         /**
2035          * Perform a deletion and output success or failure messages
2036          */
2037         function doDelete( $reason ) {
2038                 global $wgOut, $wgUser;
2039                 wfDebug( __METHOD__."\n" );
2040
2041                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2042                         if ( $this->doDeleteArticle( $reason ) ) {
2043                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2044
2045                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2046                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2047
2048                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2049                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2050
2051                                 $wgOut->addWikiText( $text );
2052                                 $wgOut->returnToMain( false );
2053                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2054                         } else {
2055                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2056                         }
2057                 }
2058         }
2059
2060         /**
2061          * Back-end article deletion
2062          * Deletes the article with database consistency, writes logs, purges caches
2063          * Returns success
2064          */
2065         function doDeleteArticle( $reason ) {
2066                 global $wgUseSquid, $wgDeferredUpdateList;
2067                 global $wgUseTrackbacks;
2068
2069                 wfDebug( __METHOD__."\n" );
2070
2071                 $dbw = wfGetDB( DB_MASTER );
2072                 $ns = $this->mTitle->getNamespace();
2073                 $t = $this->mTitle->getDBkey();
2074                 $id = $this->mTitle->getArticleID();
2075
2076                 if ( $t == '' || $id == 0 ) {
2077                         return false;
2078                 }
2079
2080                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2081                 array_push( $wgDeferredUpdateList, $u );
2082
2083                 // For now, shunt the revision data into the archive table.
2084                 // Text is *not* removed from the text table; bulk storage
2085                 // is left intact to avoid breaking block-compression or
2086                 // immutable storage schemes.
2087                 //
2088                 // For backwards compatibility, note that some older archive
2089                 // table entries will have ar_text and ar_flags fields still.
2090                 //
2091                 // In the future, we may keep revisions and mark them with
2092                 // the rev_deleted field, which is reserved for this purpose.
2093                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2094                         array(
2095                                 'ar_namespace'  => 'page_namespace',
2096                                 'ar_title'      => 'page_title',
2097                                 'ar_comment'    => 'rev_comment',
2098                                 'ar_user'       => 'rev_user',
2099                                 'ar_user_text'  => 'rev_user_text',
2100                                 'ar_timestamp'  => 'rev_timestamp',
2101                                 'ar_minor_edit' => 'rev_minor_edit',
2102                                 'ar_rev_id'     => 'rev_id',
2103                                 'ar_text_id'    => 'rev_text_id',
2104                                 'ar_text'       => '\'\'', // Be explicit to appease
2105                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2106                                 'ar_len'                => 'rev_len'
2107                         ), array(
2108                                 'page_id' => $id,
2109                                 'page_id = rev_page'
2110                         ), __METHOD__
2111                 );
2112
2113                 # Delete restrictions for it
2114                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2115
2116                 # Now that it's safely backed up, delete it
2117                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2118
2119                 # If using cascading deletes, we can skip some explicit deletes
2120                 if ( !$dbw->cascadingDeletes() ) {
2121
2122                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2123
2124                         if ($wgUseTrackbacks)
2125                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2126
2127                         # Delete outgoing links
2128                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2129                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2130                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2131                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2132                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2133                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2134                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2135                 }
2136
2137                 # If using cleanup triggers, we can skip some manual deletes
2138                 if ( !$dbw->cleanupTriggers() ) {
2139
2140                         # Clean up recentchanges entries...
2141                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2142                 }
2143
2144                 # Clear caches
2145                 Article::onArticleDelete( $this->mTitle );
2146
2147                 # Log the deletion
2148                 $log = new LogPage( 'delete' );
2149                 $log->addEntry( 'delete', $this->mTitle, $reason );
2150
2151                 # Clear the cached article id so the interface doesn't act like we exist
2152                 $this->mTitle->resetArticleID( 0 );
2153                 $this->mTitle->mArticleID = 0;
2154                 return true;
2155         }
2156
2157         /**
2158          * Revert a modification
2159          */
2160         function rollback() {
2161                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2162
2163                 if( $wgUser->isAllowed( 'rollback' ) ) {
2164                         if( $wgUser->isBlocked() ) {
2165                                 $wgOut->blockedPage();
2166                                 return;
2167                         }
2168                 } else {
2169                         $wgOut->permissionRequired( 'rollback' );
2170                         return;
2171                 }
2172
2173                 if ( wfReadOnly() ) {
2174                         $wgOut->readOnlyPage( $this->getContent() );
2175                         return;
2176                 }
2177                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2178                         array( $this->mTitle->getPrefixedText(),
2179                                 $wgRequest->getVal( 'from' ) )  ) ) {
2180                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2181                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2182                         return;
2183                 }
2184                 $dbw = wfGetDB( DB_MASTER );
2185
2186                 # Enhanced rollback, marks edits rc_bot=1
2187                 $bot = $wgRequest->getBool( 'bot' );
2188
2189                 # Replace all this user's current edits with the next one down
2190
2191                 # Get the last editor
2192                 $current = Revision::newFromTitle( $this->mTitle );
2193                 if( is_null( $current ) ) {
2194                         # Something wrong... no page?
2195                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2196                         return;
2197                 }
2198
2199                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2200                 if( $from != $current->getUserText() ) {
2201                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2202                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2203                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2204                                 htmlspecialchars( $from ),
2205                                 htmlspecialchars( $current->getUserText() ) ) );
2206                         if( $current->getComment() != '') {
2207                                 $wgOut->addHTML(
2208                                         wfMsg( 'editcomment',
2209                                         $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2210                         }
2211                         return;
2212                 }
2213
2214                 # Get the last edit not by this guy
2215                 $user = intval( $current->getUser() );
2216                 $user_text = $dbw->addQuotes( $current->getUserText() );
2217                 $s = $dbw->selectRow( 'revision',
2218                         array( 'rev_id', 'rev_timestamp' ),
2219                         array(
2220                                 'rev_page' => $current->getPage(),
2221                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2222                         ), __METHOD__,
2223                         array(
2224                                 'USE INDEX' => 'page_timestamp',
2225                                 'ORDER BY'  => 'rev_timestamp DESC' )
2226                         );
2227                 if( $s === false ) {
2228                         # Something wrong
2229                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2230                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2231                         return;
2232                 }
2233
2234                 $set = array();
2235                 if ( $bot ) {
2236                         # Mark all reverted edits as bot
2237                         $set['rc_bot'] = 1;
2238                 }
2239                 if ( $wgUseRCPatrol ) {
2240                         # Mark all reverted edits as patrolled
2241                         $set['rc_patrolled'] = 1;
2242                 }
2243
2244                 if ( $set ) {
2245                         $dbw->update( 'recentchanges', $set,
2246                                 array( /* WHERE */
2247                                         'rc_cur_id'    => $current->getPage(),
2248                                         'rc_user_text' => $current->getUserText(),
2249                                         "rc_timestamp > '{$s->rev_timestamp}'",
2250                                 ), __METHOD__
2251                         );
2252                 }
2253
2254                 # Get the edit summary
2255                 $target = Revision::newFromId( $s->rev_id );
2256                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2257                 $newComment = $wgRequest->getText( 'summary', $newComment );
2258
2259                 # Save it!
2260                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2261                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2262                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2263
2264                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2265
2266                 $wgOut->returnToMain( false );
2267         }
2268
2269
2270         /**
2271          * Do standard deferred updates after page view
2272          * @private
2273          */
2274         function viewUpdates() {
2275                 global $wgDeferredUpdateList;
2276
2277                 if ( 0 != $this->getID() ) {
2278                         global $wgDisableCounters;
2279                         if( !$wgDisableCounters ) {
2280                                 Article::incViewCount( $this->getID() );
2281                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2282                                 array_push( $wgDeferredUpdateList, $u );
2283                         }
2284                 }
2285
2286                 # Update newtalk / watchlist notification status
2287                 global $wgUser;
2288                 $wgUser->clearNotification( $this->mTitle );
2289         }
2290
2291         /**
2292          * Do standard deferred updates after page edit.
2293          * Update links tables, site stats, search index and message cache.
2294          * Every 1000th edit, prune the recent changes table.
2295          *
2296          * @private
2297          * @param $text New text of the article
2298          * @param $summary Edit summary
2299          * @param $minoredit Minor edit
2300          * @param $timestamp_of_pagechange Timestamp associated with the page change
2301          * @param $newid rev_id value of the new revision
2302          * @param $changed Whether or not the content actually changed
2303          */
2304         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2305                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2306
2307                 wfProfileIn( __METHOD__ );
2308
2309                 # Parse the text
2310                 $options = new ParserOptions;
2311                 $options->setTidy(true);
2312                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2313
2314                 # Save it to the parser cache
2315                 $parserCache =& ParserCache::singleton();
2316                 $parserCache->save( $poutput, $this, $wgUser );
2317
2318                 # Update the links tables
2319                 $u = new LinksUpdate( $this->mTitle, $poutput );
2320                 $u->doUpdate();
2321
2322                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2323                         wfSeedRandom();
2324                         if ( 0 == mt_rand( 0, 99 ) ) {
2325                                 # Periodically flush old entries from the recentchanges table.
2326                                 global $wgRCMaxAge;
2327
2328                                 $dbw = wfGetDB( DB_MASTER );
2329                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2330                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2331                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2332                                 $dbw->query( $sql );
2333                         }
2334                 }
2335
2336                 $id = $this->getID();
2337                 $title = $this->mTitle->getPrefixedDBkey();
2338                 $shortTitle = $this->mTitle->getDBkey();
2339
2340                 if ( 0 == $id ) {
2341                         wfProfileOut( __METHOD__ );
2342                         return;
2343                 }
2344
2345                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2346                 array_push( $wgDeferredUpdateList, $u );
2347                 $u = new SearchUpdate( $id, $title, $text );
2348                 array_push( $wgDeferredUpdateList, $u );
2349
2350                 # If this is another user's talk page, update newtalk
2351                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2352                 # load of user talk pages and piss people off, nor if it's a minor edit
2353                 # by a properly-flagged bot.
2354                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2355                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2356                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2357                                 $other = User::newFromName( $shortTitle );
2358                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2359                                         // An anonymous user
2360                                         $other = new User();
2361                                         $other->setName( $shortTitle );
2362                                 }
2363                                 if( $other ) {
2364                                         $other->setNewtalk( true );
2365                                 }
2366                         }
2367                 }
2368
2369                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2370                         $wgMessageCache->replace( $shortTitle, $text );
2371                 }
2372
2373                 wfProfileOut( __METHOD__ );
2374         }
2375
2376         /**
2377          * Perform article updates on a special page creation.
2378          *
2379          * @param Revision $rev
2380          *
2381          * @todo This is a shitty interface function. Kill it and replace the
2382          * other shitty functions like editUpdates and such so it's not needed
2383          * anymore.
2384          */
2385         function createUpdates( $rev ) {
2386                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2387                 $this->mTotalAdjustment = 1;
2388                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2389                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2390         }
2391
2392         /**
2393          * Generate the navigation links when browsing through an article revisions
2394          * It shows the information as:
2395          *   Revision as of \<date\>; view current revision
2396          *   \<- Previous version | Next Version -\>
2397          *
2398          * @private
2399          * @param string $oldid         Revision ID of this article revision
2400          */
2401         function setOldSubtitle( $oldid=0 ) {
2402                 global $wgLang, $wgOut, $wgUser;
2403
2404                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2405                                 return;
2406                 }
2407
2408                 $revision = Revision::newFromId( $oldid );
2409
2410                 $current = ( $oldid == $this->mLatest );
2411                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2412                 $sk = $wgUser->getSkin();
2413                 $lnk = $current
2414                         ? wfMsg( 'currentrevisionlink' )
2415                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2416                 $curdiff = $current
2417                         ? wfMsg( 'diff' )
2418                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2419                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2420                 $prevlink = $prev
2421                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2422                         : wfMsg( 'previousrevision' );
2423                 $prevdiff = $prev
2424                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2425                         : wfMsg( 'diff' );
2426                 $nextlink = $current
2427                         ? wfMsg( 'nextrevision' )
2428                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2429                 $nextdiff = $current
2430                         ? wfMsg( 'diff' )
2431                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2432
2433                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2434                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2435
2436                 $m = wfMsg( 'revision-info-current' );
2437                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2438                         ? 'revision-info-current'
2439                         : 'revision-info';
2440
2441                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2442                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2443                 $wgOut->setSubtitle( $r );
2444         }
2445
2446         /**
2447          * This function is called right before saving the wikitext,
2448          * so we can do things like signatures and links-in-context.
2449          *
2450          * @param string $text
2451          */
2452         function preSaveTransform( $text ) {
2453                 global $wgParser, $wgUser;
2454                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2455         }
2456
2457         /* Caching functions */
2458
2459         /**
2460          * checkLastModified returns true if it has taken care of all
2461          * output to the client that is necessary for this request.
2462          * (that is, it has sent a cached version of the page)
2463          */
2464         function tryFileCache() {
2465                 static $called = false;
2466                 if( $called ) {
2467                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2468                         return;
2469                 }
2470                 $called = true;
2471                 if($this->isFileCacheable()) {
2472                         $touched = $this->mTouched;
2473                         $cache = new HTMLFileCache( $this->mTitle );
2474                         if($cache->isFileCacheGood( $touched )) {
2475                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2476                                 $cache->loadFromFileCache();
2477                                 return true;
2478                         } else {
2479                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2480                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2481                         }
2482                 } else {
2483                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2484                 }
2485         }
2486
2487         /**
2488          * Check if the page can be cached
2489          * @return bool
2490          */
2491         function isFileCacheable() {
2492                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2493                 $action    = $wgRequest->getVal( 'action'    );
2494                 $oldid     = $wgRequest->getVal( 'oldid'     );
2495                 $diff      = $wgRequest->getVal( 'diff'      );
2496                 $redirect  = $wgRequest->getVal( 'redirect'  );
2497                 $printable = $wgRequest->getVal( 'printable' );
2498                 $page      = $wgRequest->getVal( 'page' );
2499
2500                 //check for non-standard user language; this covers uselang,
2501                 //and extensions for auto-detecting user language.
2502                 $ulang     = $wgLang->getCode();
2503                 $clang     = $wgContLang->getCode();
2504
2505                 $cacheable = $wgUseFileCache
2506                         && (!$wgShowIPinHeader)
2507                         && ($this->getID() != 0)
2508                         && ($wgUser->isAnon())
2509                         && (!$wgUser->getNewtalk())
2510                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2511                         && (empty( $action ) || $action == 'view')
2512                         && (!isset($oldid))
2513                         && (!isset($diff))
2514                         && (!isset($redirect))
2515                         && (!isset($printable))
2516                         && !isset($page)
2517                         && (!$this->mRedirectedFrom)
2518                         && ($ulang === $clang);
2519
2520                 if ( $cacheable ) {
2521                         //extension may have reason to disable file caching on some pages.
2522                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2523                 }
2524
2525                 return $cacheable;
2526         }
2527
2528         /**
2529          * Loads page_touched and returns a value indicating if it should be used
2530          *
2531          */
2532         function checkTouched() {
2533                 if( !$this->mDataLoaded ) {
2534                         $this->loadPageData();
2535                 }
2536                 return !$this->mIsRedirect;
2537         }
2538
2539         /**
2540          * Get the page_touched field
2541          */
2542         function getTouched() {
2543                 # Ensure that page data has been loaded
2544                 if( !$this->mDataLoaded ) {
2545                         $this->loadPageData();
2546                 }
2547                 return $this->mTouched;
2548         }
2549
2550         /**
2551          * Get the page_latest field
2552          */
2553         function getLatest() {
2554                 if ( !$this->mDataLoaded ) {
2555                         $this->loadPageData();
2556                 }
2557                 return $this->mLatest;
2558         }
2559
2560         /**
2561          * Edit an article without doing all that other stuff
2562          * The article must already exist; link tables etc
2563          * are not updated, caches are not flushed.
2564          *
2565          * @param string $text text submitted
2566          * @param string $comment comment submitted
2567          * @param bool $minor whereas it's a minor modification
2568          */
2569         function quickEdit( $text, $comment = '', $minor = 0 ) {
2570                 wfProfileIn( __METHOD__ );
2571
2572                 $dbw = wfGetDB( DB_MASTER );
2573                 $dbw->begin();
2574                 $revision = new Revision( array(
2575                         'page'       => $this->getId(),
2576                         'text'       => $text,
2577                         'comment'    => $comment,
2578                         'minor_edit' => $minor ? 1 : 0,
2579                         ) );
2580                 $revision->insertOn( $dbw );
2581                 $this->updateRevisionOn( $dbw, $revision );
2582                 $dbw->commit();
2583
2584                 wfProfileOut( __METHOD__ );
2585         }
2586
2587         /**
2588          * Used to increment the view counter
2589          *
2590          * @static
2591          * @param integer $id article id
2592          */
2593         function incViewCount( $id ) {
2594                 $id = intval( $id );
2595                 global $wgHitcounterUpdateFreq, $wgDBtype;
2596
2597                 $dbw = wfGetDB( DB_MASTER );
2598                 $pageTable = $dbw->tableName( 'page' );
2599                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2600                 $acchitsTable = $dbw->tableName( 'acchits' );
2601
2602                 if( $wgHitcounterUpdateFreq <= 1 ) {
2603                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2604                         return;
2605                 }
2606
2607                 # Not important enough to warrant an error page in case of failure
2608                 $oldignore = $dbw->ignoreErrors( true );
2609
2610                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2611
2612                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2613                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2614                         # Most of the time (or on SQL errors), skip row count check
2615                         $dbw->ignoreErrors( $oldignore );
2616                         return;
2617                 }
2618
2619                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2620                 $row = $dbw->fetchObject( $res );
2621                 $rown = intval( $row->n );
2622                 if( $rown >= $wgHitcounterUpdateFreq ){
2623                         wfProfileIn( 'Article::incViewCount-collect' );
2624                         $old_user_abort = ignore_user_abort( true );
2625
2626                         if ($wgDBtype == 'mysql')
2627                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2628                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2629                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2630                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2631                                 'GROUP BY hc_id');
2632                         $dbw->query("DELETE FROM $hitcounterTable");
2633                         if ($wgDBtype == 'mysql') {
2634                                 $dbw->query('UNLOCK TABLES');
2635                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2636                                         'WHERE page_id = hc_id');
2637                         }
2638                         else {
2639                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2640                                         "FROM $acchitsTable WHERE page_id = hc_id");
2641                         }
2642                         $dbw->query("DROP TABLE $acchitsTable");
2643
2644                         ignore_user_abort( $old_user_abort );
2645                         wfProfileOut( 'Article::incViewCount-collect' );
2646                 }
2647                 $dbw->ignoreErrors( $oldignore );
2648         }
2649
2650         /**#@+
2651          * The onArticle*() functions are supposed to be a kind of hooks
2652          * which should be called whenever any of the specified actions
2653          * are done.
2654          *
2655          * This is a good place to put code to clear caches, for instance.
2656          *
2657          * This is called on page move and undelete, as well as edit
2658          * @static
2659          * @param $title_obj a title object
2660          */
2661
2662         static function onArticleCreate($title) {
2663                 # The talk page isn't in the regular link tables, so we need to update manually:
2664                 if ( $title->isTalkPage() ) {
2665                         $other = $title->getSubjectPage();
2666                 } else {
2667                         $other = $title->getTalkPage();
2668                 }
2669                 $other->invalidateCache();
2670                 $other->purgeSquid();
2671
2672                 $title->touchLinks();
2673                 $title->purgeSquid();
2674         }
2675
2676         static function onArticleDelete( $title ) {
2677                 global $wgUseFileCache, $wgMessageCache;
2678
2679                 $title->touchLinks();
2680                 $title->purgeSquid();
2681
2682                 # File cache
2683                 if ( $wgUseFileCache ) {
2684                         $cm = new HTMLFileCache( $title );
2685                         @unlink( $cm->fileCacheName() );
2686                 }
2687
2688                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2689                         $wgMessageCache->replace( $title->getDBkey(), false );
2690                 }
2691         }
2692
2693         /**
2694          * Purge caches on page update etc
2695          */
2696         static function onArticleEdit( $title ) {
2697                 global $wgDeferredUpdateList, $wgUseFileCache;
2698
2699                 // Invalidate caches of articles which include this page
2700                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2701                 $wgDeferredUpdateList[] = $update;
2702
2703                 # Purge squid for this page only
2704                 $title->purgeSquid();
2705
2706                 # Clear file cache
2707                 if ( $wgUseFileCache ) {
2708                         $cm = new HTMLFileCache( $title );
2709                         @unlink( $cm->fileCacheName() );
2710                 }
2711         }
2712
2713         /**#@-*/
2714
2715         /**
2716          * Info about this page
2717          * Called for ?action=info when $wgAllowPageInfo is on.
2718          *
2719          * @public
2720          */
2721         function info() {
2722                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2723
2724                 if ( !$wgAllowPageInfo ) {
2725                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2726                         return;
2727                 }
2728
2729                 $page = $this->mTitle->getSubjectPage();
2730
2731                 $wgOut->setPagetitle( $page->getPrefixedText() );
2732                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2733
2734                 # first, see if the page exists at all.
2735                 $exists = $page->getArticleId() != 0;
2736                 if( !$exists ) {
2737                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2738                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2739                         } else {
2740                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2741                         }
2742                 } else {
2743                         $dbr = wfGetDB( DB_SLAVE );
2744                         $wl_clause = array(
2745                                 'wl_title'     => $page->getDBkey(),
2746                                 'wl_namespace' => $page->getNamespace() );
2747                         $numwatchers = $dbr->selectField(
2748                                 'watchlist',
2749                                 'COUNT(*)',
2750                                 $wl_clause,
2751                                 __METHOD__,
2752                                 $this->getSelectOptions() );
2753
2754                         $pageInfo = $this->pageCountInfo( $page );
2755                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2756
2757                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2758                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2759                         if( $talkInfo ) {
2760                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2761                         }
2762                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2763                         if( $talkInfo ) {
2764                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2765                         }
2766                         $wgOut->addHTML( '</ul>' );
2767
2768                 }
2769         }
2770
2771         /**
2772          * Return the total number of edits and number of unique editors
2773          * on a given page. If page does not exist, returns false.
2774          *
2775          * @param Title $title
2776          * @return array
2777          * @private
2778          */
2779         function pageCountInfo( $title ) {
2780                 $id = $title->getArticleId();
2781                 if( $id == 0 ) {
2782                         return false;
2783                 }
2784
2785                 $dbr = wfGetDB( DB_SLAVE );
2786
2787                 $rev_clause = array( 'rev_page' => $id );
2788
2789                 $edits = $dbr->selectField(
2790                         'revision',
2791                         'COUNT(rev_page)',
2792                         $rev_clause,
2793                         __METHOD__,
2794                         $this->getSelectOptions() );
2795
2796                 $authors = $dbr->selectField(
2797                         'revision',
2798                         'COUNT(DISTINCT rev_user_text)',
2799                         $rev_clause,
2800                         __METHOD__,
2801                         $this->getSelectOptions() );
2802
2803                 return array( 'edits' => $edits, 'authors' => $authors );
2804         }
2805
2806         /**
2807          * Return a list of templates used by this article.
2808          * Uses the templatelinks table
2809          *
2810          * @return array Array of Title objects
2811          */
2812         function getUsedTemplates() {
2813                 $result = array();
2814                 $id = $this->mTitle->getArticleID();
2815                 if( $id == 0 ) {
2816                         return array();
2817                 }
2818
2819                 $dbr = wfGetDB( DB_SLAVE );
2820                 $res = $dbr->select( array( 'templatelinks' ),
2821                         array( 'tl_namespace', 'tl_title' ),
2822                         array( 'tl_from' => $id ),
2823                         'Article:getUsedTemplates' );
2824                 if ( false !== $res ) {
2825                         if ( $dbr->numRows( $res ) ) {
2826                                 while ( $row = $dbr->fetchObject( $res ) ) {
2827                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2828                                 }
2829                         }
2830                 }
2831                 $dbr->freeResult( $res );
2832                 return $result;
2833         }
2834
2835         /**
2836          * Return an auto-generated summary if the text provided is a redirect.
2837          *
2838          * @param  string $text The wikitext to check
2839          * @return string '' or an appropriate summary
2840          */
2841         public static function getRedirectAutosummary( $text ) {
2842                 $rt = Title::newFromRedirect( $text );
2843                 if( is_object( $rt ) )
2844                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2845                 else
2846                         return '';
2847         }
2848
2849         /**
2850          * Return an auto-generated summary if the new text is much shorter than
2851          * the old text.
2852          *
2853          * @param  string $oldtext The previous text of the page
2854          * @param  string $text    The submitted text of the page
2855          * @return string An appropriate autosummary, or an empty string.
2856          */
2857         public static function getBlankingAutosummary( $oldtext, $text ) {
2858                 if ($oldtext!='' && $text=='') {
2859                         return wfMsgForContent('autosumm-blank');
2860                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
2861                         #Removing more than 90% of the article
2862                         global $wgContLang;
2863                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
2864                         return wfMsgForContent('autosumm-replace', $truncatedtext);
2865                 } else {
2866                         return '';
2867                 }
2868         }
2869
2870         /**
2871         * Return an applicable autosummary if one exists for the given edit.
2872         * @param string $oldtext The previous text of the page.
2873         * @param string $newtext The submitted text of the page.
2874         * @param bitmask $flags A bitmask of flags submitted for the edit.
2875         * @return string An appropriate autosummary, or an empty string.
2876         */
2877         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2878
2879                 # This code is UGLY UGLY UGLY.
2880                 # Somebody PLEASE come up with a more elegant way to do it.
2881
2882                 #Redirect autosummaries
2883                 $summary = self::getRedirectAutosummary( $newtext );
2884
2885                 if ($summary)
2886                         return $summary;
2887
2888                 #Blanking autosummaries
2889                 if (!($flags & EDIT_NEW))
2890                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
2891
2892                 if ($summary)
2893                         return $summary;
2894
2895                 #New page autosummaries
2896                 if ($flags & EDIT_NEW && strlen($newtext)) {
2897                         #If they're making a new article, give its text, truncated, in the summary.
2898                         global $wgContLang;
2899                         $truncatedtext = $wgContLang->truncate(
2900                                 str_replace("\n", ' ', $newtext),
2901                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
2902                                 '...' );
2903                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
2904                 }
2905
2906                 if ($summary)
2907                         return $summary;
2908
2909                 return $summary;
2910         }
2911
2912         /**
2913          * Add the primary page-view wikitext to the output buffer
2914          * Saves the text into the parser cache if possible.
2915          * Updates templatelinks if it is out of date.
2916          *
2917          * @param string  $text
2918          * @param bool    $cache
2919          */
2920         public function outputWikiText( $text, $cache = true ) {
2921                 global $wgParser, $wgUser, $wgOut;
2922
2923                 $popts = $wgOut->parserOptions();
2924                 $popts->setTidy(true);
2925                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
2926                         $popts, true, true, $this->getRevIdFetched() );
2927                 $popts->setTidy(false);
2928                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
2929                         $parserCache =& ParserCache::singleton();
2930                         $parserCache->save( $parserOutput, $this, $wgUser );
2931                 }
2932
2933                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
2934                         // templatelinks table may have become out of sync,
2935                         // especially if using variable-based transclusions.
2936                         // For paranoia, check if things have changed and if
2937                         // so apply updates to the database. This will ensure
2938                         // that cascaded protections apply as soon as the changes
2939                         // are visible.
2940
2941                         # Get templates from templatelinks
2942                         $id = $this->mTitle->getArticleID();
2943
2944                         $tlTemplates = array();
2945
2946                         $dbr = wfGetDB( DB_SLAVE );
2947                         $res = $dbr->select( array( 'templatelinks' ),
2948                                 array( 'tl_namespace', 'tl_title' ),
2949                                 array( 'tl_from' => $id ),
2950                                 'Article:getUsedTemplates' );
2951
2952                         global $wgContLang;
2953
2954                         if ( false !== $res ) {
2955                                 if ( $dbr->numRows( $res ) ) {
2956                                         while ( $row = $dbr->fetchObject( $res ) ) {
2957                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
2958                                         }
2959                                 }
2960                         }
2961
2962                         # Get templates from parser output.
2963                         $poTemplates_allns = $parserOutput->getTemplates();
2964
2965                         $poTemplates = array ();
2966                         foreach ( $poTemplates_allns as $ns_templates ) {
2967                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
2968                         }
2969
2970                         # Get the diff
2971                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
2972
2973                         if ( count( $templates_diff ) > 0 ) {
2974                                 # Whee, link updates time.
2975                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
2976
2977                                 $dbw = wfGetDb( DB_MASTER );
2978                                 $dbw->begin();
2979
2980                                 $u->doUpdate();
2981
2982                                 $dbw->commit();
2983                         }
2984                 }
2985
2986                 $wgOut->addParserOutput( $parserOutput );
2987         }
2988
2989 }
2990
2991 ?>