includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Need the CacheManager to be loaded
   9  */
  10 require_once( 'CacheManager.php' );
  11 require_once( 'Revision.php' );
  12
  13 $wgArticleCurContentFields = false;
  14 $wgArticleOldContentFields = false;
  15
  16 /**
  17  * Class representing a MediaWiki article and history.
  18  *
  19  * See design.txt for an overview.
  20  * Note: edit user interface and cache support functions have been
  21  * moved to separate EditPage and CacheManager classes.
  22  *
  23  * @package MediaWiki
  24  */
  25 class Article {
  26         /**#@+
  27          * @access private
  28          */
  29         var $mContent, $mContentLoaded;
  30         var $mUser, $mTimestamp, $mUserText;
  31         var $mCounter, $mComment, $mGoodAdjustment, $mTotalAdjustment;
  32         var $mMinorEdit, $mRedirectedFrom;
  33         var $mTouched, $mFileCache, $mTitle;
  34         var $mId, $mTable;
  35         var $mForUpdate;
  36         var $mOldId;
  37         var $mRevIdFetched;
  38         var $mRevision;
  39         /**#@-*/
  40
  41         /**
  42          * Constructor and clear the article
  43          * @param mixed &$title
  44          */
  45         function Article( &$title ) {
  46                 $this->mTitle =& $title;
  47                 $this->clear();
  48         }
  49
  50         /**
  51          * get the title object of the article
  52          * @public
  53          */
  54         function getTitle() {
  55                 return $this->mTitle;
  56         }
  57
  58         /**
  59           * Clear the object
  60           * @private
  61           */
  62         function clear() {
  63                 $this->mDataLoaded    = false;
  64                 $this->mContentLoaded = false;
  65
  66                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
  67                 $this->mRedirectedFrom = $this->mUserText =
  68                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
  69                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
  70                 $this->mTouched = '19700101000000';
  71                 $this->mForUpdate = false;
  72                 $this->mIsRedirect = false;
  73                 $this->mRevIdFetched = 0;
  74         }
  75
  76         /**
  77          * Note that getContent/loadContent may follow redirects if
  78          * not told otherwise, and so may cause a change to mTitle.
  79          *
  80          * @param $noredir
  81          * @return Return the text of this revision
  82         */
  83         function getContent( $noredir ) {
  84                 global $wgRequest, $wgUser, $wgOut;
  85
  86                 # Get variables from query string :P
  87                 $action = $wgRequest->getText( 'action', 'view' );
  88                 $section = $wgRequest->getText( 'section' );
  89                 $preload = $wgRequest->getText( 'preload' );
  90
  91                 $fname =  'Article::getContent';
  92                 wfProfileIn( $fname );
  93
  94                 if ( 0 == $this->getID() ) {
  95                         if ( 'edit' == $action ) {
  96                                 wfProfileOut( $fname );
  97
  98                                 # If requested, preload some text.
  99                                 $text=$this->getPreloadedText($preload);
 100
 101                                 # We used to put MediaWiki:Newarticletext here if
 102                                 # $text was empty at this point.
 103                                 # This is now shown above the edit box instead.
 104                                 return $text;
 105                         }
 106                         wfProfileOut( $fname );
 107                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 108
 109                         $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 110                         return "<div class='noarticletext'>$ret</div>";
 111                 } else {
 112                         $this->loadContent( $noredir );
 113                         # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 114                         if ( $this->mTitle->getNamespace() == NS_USER_TALK &&
 115                           $wgUser->isIP($this->mTitle->getText()) &&
 116                           $action=='view'
 117                         ) {
 118                                 wfProfileOut( $fname );
 119                                 return $this->mContent . "\n" .wfMsg('anontalkpagetext');
 120                         } else {
 121                                 if($action=='edit') {
 122                                         if($section!='') {
 123                                                 if($section=='new') {
 124                                                         wfProfileOut( $fname );
 125                                                         $text=$this->getPreloadedText($preload);
 126                                                         return $text;
 127                                                 }
 128
 129                                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 130                                                 # comments to be stripped as well)
 131                                                 $rv=$this->getSection($this->mContent,$section);
 132                                                 wfProfileOut( $fname );
 133                                                 return $rv;
 134                                         }
 135                                 }
 136                                 wfProfileOut( $fname );
 137                                 return $this->mContent;
 138                         }
 139                 }
 140         }
 141
 142         /**
 143                 This function accepts a title string as parameter
 144                 ($preload). If this string is non-empty, it attempts
 145                 to fetch the current revision text.
 146         */
 147         function getPreloadedText($preload) {
 148                 if($preload) {
 149                         $preloadTitle=Title::newFromText($preload);
 150                         if(isset($preloadTitle) && $preloadTitle->userCanRead()) {
 151                         $rev=Revision::newFromTitle($preloadTitle);
 152                         if($rev) {
 153                                 return $rev->getText();
 154                                 }
 155                         }
 156                 }
 157                 return '';
 158         }
 159
 160         /**
 161          * This function returns the text of a section, specified by a number ($section).
 162          * A section is text under a heading like == Heading == or <h1>Heading</h1>, or
 163          * the first section before any such heading (section 0).
 164          *
 165          * If a section contains subsections, these are also returned.
 166          *
 167          * @param string $text text to look in
 168          * @param integer $section section number
 169          * @return string text of the requested section
 170          */
 171         function getSection($text,$section) {
 172
 173                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 174                 # comments to be stripped as well)
 175                 $striparray=array();
 176                 $parser=new Parser();
 177                 $parser->mOutputType=OT_WIKI;
 178                 $parser->mOptions = new ParserOptions();
 179                 $striptext=$parser->strip($text, $striparray, true);
 180
 181                 # now that we can be sure that no pseudo-sections are in the source,
 182                 # split it up by section
 183                 $secs =
 184                   preg_split(
 185                   '/(^=+.+?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)(?!\S)/mi',
 186                   $striptext, -1,
 187                   PREG_SPLIT_DELIM_CAPTURE);
 188                 if($section==0) {
 189                         $rv=$secs[0];
 190                 } else {
 191                         $headline=$secs[$section*2-1];
 192                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$headline,$matches);
 193                         $hlevel=$matches[1];
 194
 195                         # translate wiki heading into level
 196                         if(strpos($hlevel,'=')!==false) {
 197                                 $hlevel=strlen($hlevel);
 198                         }
 199
 200                         $rv=$headline. $secs[$section*2];
 201                         $count=$section+1;
 202
 203                         $break=false;
 204                         while(!empty($secs[$count*2-1]) && !$break) {
 205
 206                                 $subheadline=$secs[$count*2-1];
 207                                 preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$subheadline,$matches);
 208                                 $subhlevel=$matches[1];
 209                                 if(strpos($subhlevel,'=')!==false) {
 210                                         $subhlevel=strlen($subhlevel);
 211                                 }
 212                                 if($subhlevel > $hlevel) {
 213                                         $rv.=$subheadline.$secs[$count*2];
 214                                 }
 215                                 if($subhlevel <= $hlevel) {
 216                                         $break=true;
 217                                 }
 218                                 $count++;
 219
 220                         }
 221                 }
 222                 # reinsert stripped tags
 223                 $rv=$parser->unstrip($rv,$striparray);
 224                 $rv=$parser->unstripNoWiki($rv,$striparray);
 225                 $rv=trim($rv);
 226                 return $rv;
 227
 228         }
 229
 230         /**
 231          * Return the oldid of the article that is to be shown.
 232          * For requests with a "direction", this is not the oldid of the
 233          * query
 234          */
 235         function getOldID() {
 236                 global $wgRequest, $wgOut;
 237                 static $lastid;
 238
 239                 if ( isset( $lastid ) ) {
 240                         return $lastid;
 241                 }
 242                 # Query variables :P
 243                 $oldid = $wgRequest->getVal( 'oldid' );
 244                 if ( isset( $oldid ) ) {
 245                         $oldid = intval( $oldid );
 246                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 247                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 248                                 if ( $nextid  ) {
 249                                         $oldid = $nextid;
 250                                 } else {
 251                                         $wgOut->redirect( $this->mTitle->getFullURL( 'redirect=no' ) );
 252                                 }
 253                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 254                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 255                                 if ( $previd ) {
 256                                         $oldid = $previd;
 257                                 } else {
 258                                         # TODO
 259                                 }
 260                         }
 261                         $lastid = $oldid;
 262                 }
 263                 return @$oldid; # "@" to be able to return "unset" without PHP complaining
 264         }
 265
 266
 267         /**
 268          * Load the revision (including cur_text) into this object
 269          */
 270         function loadContent( $noredir = false ) {
 271                 global $wgOut, $wgRequest;
 272
 273                 if ( $this->mContentLoaded ) return;
 274
 275                 # Query variables :P
 276                 $oldid = $this->getOldID();
 277                 $redirect = $wgRequest->getVal( 'redirect' );
 278
 279                 $fname = 'Article::loadContent';
 280
 281                 # Pre-fill content with error message so that if something
 282                 # fails we'll have something telling us what we intended.
 283
 284                 $t = $this->mTitle->getPrefixedText();
 285
 286                 $noredir = $noredir || ($wgRequest->getVal( 'redirect' ) == 'no')
 287                         || $wgRequest->getCheck( 'rdfrom' );
 288                 $this->mOldId = $oldid;
 289                 $this->fetchContent( $oldid, $noredir, true );
 290         }
 291
 292
 293         /**
 294          * Fetch a page record with the given conditions
 295          * @param Database $dbr
 296          * @param array    $conditions
 297          * @access private
 298          */
 299         function pageData( &$dbr, $conditions ) {
 300                 return $dbr->selectRow( 'page',
 301                         array(
 302                                 'page_id',
 303                                 'page_namespace',
 304                                 'page_title',
 305                                 'page_restrictions',
 306                                 'page_counter',
 307                                 'page_is_redirect',
 308                                 'page_is_new',
 309                                 'page_random',
 310                                 'page_touched',
 311                                 'page_latest',
 312                                 'page_len' ),
 313                         $conditions,
 314                         'Article::pageData' );
 315         }
 316
 317         function pageDataFromTitle( &$dbr, $title ) {
 318                 return $this->pageData( $dbr, array(
 319                         'page_namespace' => $title->getNamespace(),
 320                         'page_title'     => $title->getDBkey() ) );
 321         }
 322
 323         function pageDataFromId( &$dbr, $id ) {
 324                 return $this->pageData( $dbr, array(
 325                         'page_id' => intval( $id ) ) );
 326         }
 327
 328         /**
 329          * Set the general counter, title etc data loaded from
 330          * some source.
 331          *
 332          * @param object $data
 333          * @access private
 334          */
 335         function loadPageData( $data ) {
 336                 $this->mTitle->loadRestrictions( $data->page_restrictions );
 337                 $this->mTitle->mRestrictionsLoaded = true;
 338
 339                 $this->mCounter    = $data->page_counter;
 340                 $this->mTouched    = wfTimestamp( TS_MW, $data->page_touched );
 341                 $this->mIsRedirect = $data->page_is_redirect;
 342                 $this->mLatest     = $data->page_latest;
 343
 344                 $this->mDataLoaded = true;
 345         }
 346
 347         /**
 348          * Get text of an article from database
 349          * @param int $oldid 0 for whatever the latest revision is
 350          * @param bool $noredir Set to false to follow redirects
 351          * @param bool $globalTitle Set to true to change the global $wgTitle object when following redirects or other unexpected title changes
 352          * @return string
 353          */
 354         function fetchContent( $oldid = 0, $noredir = true, $globalTitle = false ) {
 355                 if ( $this->mContentLoaded ) {
 356                         return $this->mContent;
 357                 }
 358                 $dbr =& $this->getDB();
 359                 $fname = 'Article::fetchContent';
 360
 361                 # Pre-fill content with error message so that if something
 362                 # fails we'll have something telling us what we intended.
 363                 $t = $this->mTitle->getPrefixedText();
 364                 if( $oldid ) {
 365                         $t .= ',oldid='.$oldid;
 366                 }
 367                 if( isset( $redirect ) ) {
 368                         $redirect = ($redirect == 'no') ? 'no' : 'yes';
 369                         $t .= ',redirect='.$redirect;
 370                 }
 371                 $this->mContent = wfMsg( 'missingarticle', $t );
 372
 373                 if( $oldid ) {
 374                         $revision = Revision::newFromId( $oldid );
 375                         if( is_null( $revision ) ) {
 376                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 377                                 return false;
 378                         }
 379                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 380                         if( !$data ) {
 381                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 382                                 return false;
 383                         }
 384                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 385                         $this->loadPageData( $data );
 386                 } else {
 387                         if( !$this->mDataLoaded ) {
 388                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 389                                 if( !$data ) {
 390                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 391                                         return false;
 392                                 }
 393                                 $this->loadPageData( $data );
 394                         }
 395                         $revision = Revision::newFromId( $this->mLatest );
 396                         if( is_null( $revision ) ) {
 397                                 wfDebug( "$fname failed to retrieve current page, rev_id $data->page_latest\n" );
 398                                 return false;
 399                         }
 400                 }
 401
 402                 # If we got a redirect, follow it (unless we've been told
 403                 # not to by either the function parameter or the query
 404                 if ( !$oldid && !$noredir ) {
 405                         $rt = Title::newFromRedirect( $revision->getText() );
 406                         # process if title object is valid and not special:userlogout
 407                         if ( $rt && ! ( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) ) {
 408                                 # Gotta hand redirects to special pages differently:
 409                                 # Fill the HTTP response "Location" header and ignore
 410                                 # the rest of the page we're on.
 411                                 global $wgDisableHardRedirects;
 412                                 if( $globalTitle && !$wgDisableHardRedirects ) {
 413                                         global $wgOut;
 414                                         if ( $rt->getInterwiki() != '' && $rt->isLocal() ) {
 415                                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 416                                                 $wgOut->redirect( $rt->getFullURL( 'rdfrom=' . urlencode( $source ) ) ) ;
 417                                                 return false;
 418                                         }
 419                                         if ( $rt->getNamespace() == NS_SPECIAL ) {
 420                                                 $wgOut->redirect( $rt->getFullURL() );
 421                                                 return false;
 422                                         }
 423                                 }
 424                                 $redirData = $this->pageDataFromTitle( $dbr, $rt );
 425                                 if( $redirData ) {
 426                                         $redirRev = Revision::newFromId( $redirData->page_latest );
 427                                         if( !is_null( $redirRev ) ) {
 428                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 429                                                 $this->mTitle = $rt;
 430                                                 $data = $redirData;
 431                                                 $this->loadPageData( $data );
 432                                                 $revision = $redirRev;
 433                                         }
 434                                 }
 435                         }
 436                 }
 437
 438                 # if the title's different from expected, update...
 439                 if( $globalTitle ) {
 440                         global $wgTitle;
 441                         if( !$this->mTitle->equals( $wgTitle ) ) {
 442                                 $wgTitle = $this->mTitle;
 443                         }
 444                 }
 445
 446                 # Back to the business at hand...
 447                 $this->mContent   = $revision->getText();
 448
 449                 $this->mUser      = $revision->getUser();
 450                 $this->mUserText  = $revision->getUserText();
 451                 $this->mComment   = $revision->getComment();
 452                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 453
 454                 $this->mRevIdFetched = $revision->getID();
 455                 $this->mContentLoaded = true;
 456                 $this->mRevision =& $revision;
 457
 458                 return $this->mContent;
 459         }
 460
 461         /**
 462          * Gets the article text without using so many damn globals
 463          * Returns false on error
 464          *
 465          * @param integer $oldid
 466          */
 467         function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
 468                 return $this->fetchContent( $oldid, $noredir, false );
 469         }
 470
 471         /**
 472          * Read/write accessor to select FOR UPDATE
 473          */
 474         function forUpdate( $x = NULL ) {
 475                 return wfSetVar( $this->mForUpdate, $x );
 476         }
 477
 478         /**
 479          * Get the database which should be used for reads
 480          */
 481         function &getDB() {
 482                 $ret =& wfGetDB( DB_MASTER );
 483                 return $ret;
 484                 #if ( $this->mForUpdate ) {
 485                         $ret =& wfGetDB( DB_MASTER );
 486                 #} else {
 487                 #       $ret =& wfGetDB( DB_SLAVE );
 488                 #}
 489                 return $ret;
 490         }
 491
 492         /**
 493          * Get options for all SELECT statements
 494          * Can pass an option array, to which the class-wide options will be appended
 495          */
 496         function getSelectOptions( $options = '' ) {
 497                 if ( $this->mForUpdate ) {
 498                         if ( is_array( $options ) ) {
 499                                 $options[] = 'FOR UPDATE';
 500                         } else {
 501                                 $options = 'FOR UPDATE';
 502                         }
 503                 }
 504                 return $options;
 505         }
 506
 507         /**
 508          * Return the Article ID
 509          */
 510         function getID() {
 511                 if( $this->mTitle ) {
 512                         return $this->mTitle->getArticleID();
 513                 } else {
 514                         return 0;
 515                 }
 516         }
 517
 518         /**
 519          * Returns true if this article exists in the database.
 520          * @return bool
 521          */
 522         function exists() {
 523                 return $this->getId() != 0;
 524         }
 525
 526         /**
 527          * Get the view count for this article
 528          */
 529         function getCount() {
 530                 if ( -1 == $this->mCounter ) {
 531                         $id = $this->getID();
 532                         $dbr =& $this->getDB();
 533                         $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 534                                 'Article::getCount', $this->getSelectOptions() );
 535                 }
 536                 return $this->mCounter;
 537         }
 538
 539         /**
 540          * Would the given text make this article a "good" article (i.e.,
 541          * suitable for including in the article count)?
 542          * @param string $text Text to analyze
 543          * @return integer 1 if it can be counted else 0
 544          */
 545         function isCountable( $text ) {
 546                 global $wgUseCommaCount;
 547
 548                 if ( NS_MAIN != $this->mTitle->getNamespace() ) { return 0; }
 549                 if ( $this->isRedirect( $text ) ) { return 0; }
 550                 $token = ($wgUseCommaCount ? ',' : '[[' );
 551                 if ( false === strstr( $text, $token ) ) { return 0; }
 552                 return 1;
 553         }
 554
 555         /**
 556          * Tests if the article text represents a redirect
 557          */
 558         function isRedirect( $text = false ) {
 559                 if ( $text === false ) {
 560                         $this->loadContent();
 561                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 562                 } else {
 563                         $titleObj = Title::newFromRedirect( $text );
 564                 }
 565                 return $titleObj !== NULL;
 566         }
 567
 568         /**
 569          * Returns true if the currently-referenced revision is the current edit
 570          * to this page (and it exists).
 571          * @return bool
 572          */
 573         function isCurrent() {
 574                 return $this->exists() &&
 575                         isset( $this->mRevision ) &&
 576                         $this->mRevision->isCurrent();
 577         }
 578
 579         /**
 580          * Loads everything except the text
 581          * This isn't necessary for all uses, so it's only done if needed.
 582          * @private
 583          */
 584         function loadLastEdit() {
 585                 global $wgOut;
 586
 587                 if ( -1 != $this->mUser )
 588                         return;
 589
 590                 # New or non-existent articles have no user information
 591                 $id = $this->getID();
 592                 if ( 0 == $id ) return;
 593
 594                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 595                 if( !is_null( $this->mLastRevision ) ) {
 596                         $this->mUser      = $this->mLastRevision->getUser();
 597                         $this->mUserText  = $this->mLastRevision->getUserText();
 598                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 599                         $this->mComment   = $this->mLastRevision->getComment();
 600                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 601                 }
 602         }
 603
 604         function getTimestamp() {
 605                 $this->loadLastEdit();
 606                 return wfTimestamp(TS_MW, $this->mTimestamp);
 607         }
 608
 609         function getUser() {
 610                 $this->loadLastEdit();
 611                 return $this->mUser;
 612         }
 613
 614         function getUserText() {
 615                 $this->loadLastEdit();
 616                 return $this->mUserText;
 617         }
 618
 619         function getComment() {
 620                 $this->loadLastEdit();
 621                 return $this->mComment;
 622         }
 623
 624         function getMinorEdit() {
 625                 $this->loadLastEdit();
 626                 return $this->mMinorEdit;
 627         }
 628
 629         function getRevIdFetched() {
 630                 $this->loadLastEdit();
 631                 return $this->mRevIdFetched;
 632         }
 633
 634         function getContributors($limit = 0, $offset = 0) {
 635                 $fname = 'Article::getContributors';
 636
 637                 # XXX: this is expensive; cache this info somewhere.
 638
 639                 $title = $this->mTitle;
 640                 $contribs = array();
 641                 $dbr =& $this->getDB();
 642                 $revTable = $dbr->tableName( 'revision' );
 643                 $userTable = $dbr->tableName( 'user' );
 644                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 645                 $ns = $title->getNamespace();
 646                 $user = $this->getUser();
 647                 $pageId = $this->getId();
 648
 649                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 650                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 651                         WHERE rev_page = $pageId
 652                         AND rev_user != $user
 653                         GROUP BY rev_user, rev_user_text, user_real_name
 654                         ORDER BY timestamp DESC";
 655
 656                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 657                 $sql .= ' '. $this->getSelectOptions();
 658
 659                 $res = $dbr->query($sql, $fname);
 660
 661                 while ( $line = $dbr->fetchObject( $res ) ) {
 662                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 663                 }
 664
 665                 $dbr->freeResult($res);
 666                 return $contribs;
 667         }
 668
 669         /**
 670          * This is the default action of the script: just view the page of
 671          * the given title.
 672         */
 673         function view() {
 674                 global $wgUser, $wgOut, $wgRequest, $wgOnlySysopsCanPatrol, $wgLang, $wgContLang;
 675                 global $wgLinkCache, $IP, $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol;
 676                 global $wgEnotif, $wgParser, $wgParserCache, $wgUseTrackbacks;
 677                 $sk = $wgUser->getSkin();
 678
 679                 $fname = 'Article::view';
 680                 wfProfileIn( $fname );
 681                 # Get variables from query string
 682                 $oldid = $this->getOldID();
 683                 $diff = $wgRequest->getVal( 'diff' );
 684                 $rcid = $wgRequest->getVal( 'rcid' );
 685                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 686
 687                 $wgOut->setArticleFlag( true );
 688                 $wgOut->setRobotpolicy( 'index,follow' );
 689                 # If we got diff and oldid in the query, we want to see a
 690                 # diff page instead of the article.
 691
 692                 if ( !is_null( $diff ) ) {
 693                         require_once( 'DifferenceEngine.php' );
 694                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 695
 696                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 697                         // DifferenceEngine directly fetched the revision:
 698                         $this->mRevIdFetched = $de->mNewid;
 699                         $de->showDiffPage();
 700
 701                         if( $diff == 0 ) {
 702                                 # Run view updates for current revision only
 703                                 $this->viewUpdates();
 704                         }
 705                         wfProfileOut( $fname );
 706                         return;
 707                 }
 708
 709                 if ( empty( $oldid ) && $this->checkTouched() ) {
 710                         $wgOut->setETag($wgParserCache->getETag($this, $wgUser));
 711
 712                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 713                                 wfProfileOut( $fname );
 714                                 return;
 715                         } else if ( $this->tryFileCache() ) {
 716                                 # tell wgOut that output is taken care of
 717                                 $wgOut->disable();
 718                                 $this->viewUpdates();
 719                                 wfProfileOut( $fname );
 720                                 return;
 721                         }
 722                 }
 723                 # Should the parser cache be used?
 724                 $pcache = $wgEnableParserCache &&
 725                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 726                         $this->exists() &&
 727                         empty( $oldid );
 728                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 729
 730                 $outputDone = false;
 731                 if ( $pcache ) {
 732                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 733                                 $outputDone = true;
 734                         }
 735                 }
 736                 if ( !$outputDone ) {
 737                         $text = $this->getContent( false ); # May change mTitle by following a redirect
 738
 739                         # Another whitelist check in case oldid or redirects are altering the title
 740                         if ( !$this->mTitle->userCanRead() ) {
 741                                 $wgOut->loginToUse();
 742                                 $wgOut->output();
 743                                 exit;
 744                         }
 745
 746                         # We're looking at an old revision
 747
 748                         if ( !empty( $oldid ) ) {
 749                                 $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 750                                 $wgOut->setRobotpolicy( 'noindex,follow' );
 751                         }
 752                         $wasRedirected = false;
 753                         if ( '' != $this->mRedirectedFrom ) {
 754                                 if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 755                                         $sk = $wgUser->getSkin();
 756                                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, '', 'redirect=no' );
 757                                         $s = wfMsg( 'redirectedfrom', $redir );
 758                                         $wgOut->setSubtitle( $s );
 759
 760                                         // Check the parser cache again, for the target page
 761                                         if( $pcache ) {
 762                                                 if( $wgOut->tryParserCache( $this, $wgUser ) ) {
 763                                                         $outputDone = true;
 764                                                 }
 765                                         }
 766                                         $wasRedirected = true;
 767                                 }
 768                         } elseif ( !empty( $rdfrom ) ) {
 769                                 global $wgRedirectSources;
 770                                 if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 771                                         $sk = $wgUser->getSkin();
 772                                         $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 773                                         $s = wfMsg( 'redirectedfrom', $redir );
 774                                         $wgOut->setSubtitle( $s );
 775                                         $wasRedirected = true;
 776                                 }
 777                         }
 778                 }
 779                 if( !$outputDone ) {
 780                         # wrap user css and user js in pre and don't parse
 781                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 782                         if (
 783                                 $this->mTitle->getNamespace() == NS_USER &&
 784                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 785                         ) {
 786                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 787                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 788                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 789                                 # Display redirect
 790                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 791                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 792                                 if( !$wasRedirected ) {
 793                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 794                                 }
 795                                 $targetUrl = $rt->escapeLocalURL();
 796                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 797                                 $link = $sk->makeLinkObj( $rt );
 798
 799                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
 800                                   '<span class="redirectText">'.$link.'</span>' );
 801
 802                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 803                                 $catlinks = $parseout->getCategoryLinks();
 804                                 $wgOut->addCategoryLinks($catlinks);
 805                                 $skin = $wgUser->getSkin();
 806                         } else if ( $pcache ) {
 807                                 # Display content and save to parser cache
 808                                 $wgOut->addPrimaryWikiText( $text, $this );
 809                         } else {
 810                                 # Display content, don't attempt to save to parser cache
 811
 812                                 # Don't show section-edit links on old revisions... this way lies madness.
 813                                 if( !$this->isCurrent() ) {
 814                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 815                                 }
 816                                 $wgOut->addWikiText( $text );
 817
 818                                 if( !$this->isCurrent() ) {
 819                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 820                                 }
 821                         }
 822                 }
 823                 /* title may have been set from the cache */
 824                 $t = $wgOut->getPageTitle();
 825                 if( empty( $t ) ) {
 826                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 827                 }
 828
 829                 # If we have been passed an &rcid= parameter, we want to give the user a
 830                 # chance to mark this new article as patrolled.
 831                 if ( $wgUseRCPatrol
 832                         && !is_null($rcid)
 833                         && $rcid != 0
 834                         && $wgUser->isLoggedIn()
 835                         && ( $wgUser->isAllowed('patrol') || !$wgOnlySysopsCanPatrol ) )
 836                 {
 837                         $wgOut->addHTML(
 838                                 "<div class='patrollink'>" .
 839                                         wfMsg ( 'markaspatrolledlink',
 840                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 841                                         ) .
 842                                 '</div>'
 843                          );
 844                 }
 845
 846                 # Trackbacks
 847                 if ($wgUseTrackbacks)
 848                         $this->addTrackbacks();
 849
 850                 # Put link titles into the link cache
 851                 $wgOut->transformBuffer();
 852
 853                 # Add link titles as META keywords
 854                 $wgOut->addMetaTags() ;
 855
 856                 $this->viewUpdates();
 857                 wfProfileOut( $fname );
 858         }
 859
 860         function addTrackbacks() {
 861                 global $wgOut, $wgUser;
 862
 863                 $dbr =& wfGetDB(DB_SLAVE);
 864                 $tbs = $dbr->select(
 865                                 /* FROM   */ 'trackbacks',
 866                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 867                                 /* WHERE  */ array('tb_page' => $this->getID())
 868                 );
 869
 870                 if (!$dbr->numrows($tbs))
 871                         return;
 872
 873                 $tbtext = "";
 874                 while ($o = $dbr->fetchObject($tbs)) {
 875                         $rmvtxt = "";
 876                         if ($wgUser->isSysop()) {
 877                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 878                                                 . $o->tb_id . "&token=" . $wgUser->editToken());
 879                                 $rmvtxt = wfMsg('trackbackremove', $delurl);
 880                         }
 881                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 882                                         $o->tb_title,
 883                                         $o->tb_url,
 884                                         $o->tb_ex,
 885                                         $o->tb_name,
 886                                         $rmvtxt);
 887                 }
 888                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 889         }
 890
 891         function deletetrackback() {
 892                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 893
 894                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 895                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 896                         return;
 897                 }
 898
 899                 if ((!$wgUser->isAllowed('delete'))) {
 900                         $wgOut->sysopRequired();
 901                         return;
 902                 }
 903
 904                 if (wfReadOnly()) {
 905                         $wgOut->readOnlyPage();
 906                         return;
 907                 }
 908
 909                 $db =& wfGetDB(DB_MASTER);
 910                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 911                 $wgTitle->invalidateCache();
 912                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 913         }
 914
 915         function render() {
 916                 global $wgOut;
 917
 918                 $wgOut->setArticleBodyOnly(true);
 919                 $this->view();
 920         }
 921
 922         function purge() {
 923                 global $wgRequest, $wgOut, $wgUseSquid;
 924
 925                 if ( $wgRequest->wasPosted() ) {
 926                         // Invalidate the cache
 927                         $this->mTitle->invalidateCache();
 928
 929                         if ( $wgUseSquid ) {
 930                                 // Commit the transaction before the purge is sent
 931                                 $dbw = wfGetDB( DB_MASTER );
 932                                 $dbw->immediateCommit();
 933
 934                                 // Send purge
 935                                 $update = SquidUpdate::newSimplePurge( $this->mTitle );
 936                                 $update->doUpdate();
 937                         }
 938                         // Redirect to the article
 939                         $wgOut->redirect( $this->mTitle->getFullURL() );
 940                 } else {
 941                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 942                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 943                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 944                         $msg = str_replace( '$1',
 945                                 "<form method=\"post\" action=\"$action\">\n" .
 946                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 947                                 "</form>\n", $msg );
 948
 949                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 950                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 951                         $wgOut->addHTML( $msg );
 952                 }
 953         }
 954
 955         /**
 956          * Insert a new empty page record for this article.
 957          * This *must* be followed up by creating a revision
 958          * and running $this->updateToLatest( $rev_id );
 959          * or else the record will be left in a funky state.
 960          * Best if all done inside a transaction.
 961          *
 962          * @param Database $dbw
 963          * @param string   $restrictions
 964          * @return int     The newly created page_id key
 965          * @access private
 966          */
 967         function insertOn( &$dbw, $restrictions = '' ) {
 968                 $fname = 'Article::insertOn';
 969                 wfProfileIn( $fname );
 970
 971                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 972                 $dbw->insert( 'page', array(
 973                         'page_id'           => $page_id,
 974                         'page_namespace'    => $this->mTitle->getNamespace(),
 975                         'page_title'        => $this->mTitle->getDBkey(),
 976                         'page_counter'      => 0,
 977                         'page_restrictions' => $restrictions,
 978                         'page_is_redirect'  => 0, # Will set this shortly...
 979                         'page_is_new'       => 1,
 980                         'page_random'       => wfRandom(),
 981                         'page_touched'      => $dbw->timestamp(),
 982                         'page_latest'       => 0, # Fill this in shortly...
 983                         'page_len'          => 0, # Fill this in shortly...
 984                 ), $fname );
 985                 $newid = $dbw->insertId();
 986
 987                 $this->mTitle->resetArticleId( $newid );
 988
 989                 wfProfileOut( $fname );
 990                 return $newid;
 991         }
 992
 993         /**
 994          * Update the page record to point to a newly saved revision.
 995          *
 996          * @param Database $dbw
 997          * @param Revision $revision -- for ID number, and text used to set
 998                                         length and redirect status fields
 999          * @param int $lastRevision -- if given, will not overwrite the page field
1000          *                             when different from the currently set value.
1001          *                             Giving 0 indicates the new page flag should
1002          *                             be set on.
1003          * @return bool true on success, false on failure
1004          * @access private
1005          */
1006         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
1007                 $fname = 'Article::updateToRevision';
1008                 wfProfileIn( $fname );
1009
1010                 $conditions = array( 'page_id' => $this->getId() );
1011                 if( !is_null( $lastRevision ) ) {
1012                         # An extra check against threads stepping on each other
1013                         $conditions['page_latest'] = $lastRevision;
1014                 }
1015
1016                 $text = $revision->getText();
1017                 $dbw->update( 'page',
1018                         array( /* SET */
1019                                 'page_latest'      => $revision->getId(),
1020                                 'page_touched'     => $dbw->timestamp(),
1021                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1022                                 'page_is_redirect' => Article::isRedirect( $text ) ? 1 : 0,
1023                                 'page_len'         => strlen( $text ),
1024                         ),
1025                         $conditions,
1026                         $fname );
1027
1028                 wfProfileOut( $fname );
1029                 return ( $dbw->affectedRows() != 0 );
1030         }
1031
1032         /**
1033          * If the given revision is newer than the currently set page_latest,
1034          * update the page record. Otherwise, do nothing.
1035          *
1036          * @param Database $dbw
1037          * @param Revision $revision
1038          */
1039         function updateIfNewerOn( &$dbw, $revision ) {
1040                 $fname = 'Article::updateIfNewerOn';
1041                 wfProfileIn( $fname );
1042
1043                 $row = $dbw->selectRow(
1044                         array( 'revision', 'page' ),
1045                         array( 'rev_id', 'rev_timestamp' ),
1046                         array(
1047                                 'page_id' => $this->getId(),
1048                                 'page_latest=rev_id' ),
1049                         $fname );
1050                 if( $row ) {
1051                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1052                                 wfProfileOut( $fname );
1053                                 return false;
1054                         }
1055                         $prev = $row->rev_id;
1056                 } else {
1057                         # No or missing previous revision; mark the page as new
1058                         $prev = 0;
1059                 }
1060
1061                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
1062                 wfProfileOut( $fname );
1063                 return $ret;
1064         }
1065
1066         /**
1067          * Theoretically we could defer these whole insert and update
1068          * functions for after display, but that's taking a big leap
1069          * of faith, and we want to be able to report database
1070          * errors at some point.
1071          * @private
1072          */
1073         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1074                 global $wgOut, $wgUser;
1075                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
1076
1077                 $fname = 'Article::insertNewArticle';
1078                 wfProfileIn( $fname );
1079
1080                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1081                         &$summary, &$isminor, &$watchthis, NULL ) ) ) {
1082                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1083                         wfProfileOut( $fname );
1084                         return false;
1085                 }
1086
1087                 $this->mGoodAdjustment = $this->isCountable( $text );
1088                 $this->mTotalAdjustment = 1;
1089
1090                 $ns = $this->mTitle->getNamespace();
1091                 $ttl = $this->mTitle->getDBkey();
1092
1093                 # If this is a comment, add the summary as headline
1094                 if($comment && $summary!="") {
1095                         $text="== {$summary} ==\n\n".$text;
1096                 }
1097                 $text = $this->preSaveTransform( $text );
1098                 $isminor = ( $isminor && $wgUser->isLoggedIn() ) ? 1 : 0;
1099                 $now = wfTimestampNow();
1100
1101                 $dbw =& wfGetDB( DB_MASTER );
1102
1103                 # Add the page record; stake our claim on this title!
1104                 $newid = $this->insertOn( $dbw );
1105
1106                 # Save the revision text...
1107                 $revision = new Revision( array(
1108                         'page'       => $newid,
1109                         'comment'    => $summary,
1110                         'minor_edit' => $isminor,
1111                         'text'       => $text
1112                         ) );
1113                 $revisionId = $revision->insertOn( $dbw );
1114
1115                 $this->mTitle->resetArticleID( $newid );
1116
1117                 # Update the page record with revision data
1118                 $this->updateRevisionOn( $dbw, $revision, 0 );
1119
1120                 Article::onArticleCreate( $this->mTitle );
1121                 if(!$suppressRC) {
1122                         RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1123                           '', strlen( $text ), $revisionId );
1124                 }
1125
1126                 if ($watchthis) {
1127                         if(!$this->mTitle->userIsWatching()) $this->watch();
1128                 } else {
1129                         if ( $this->mTitle->userIsWatching() ) {
1130                                 $this->unwatch();
1131                         }
1132                 }
1133
1134                 # The talk page isn't in the regular link tables, so we need to update manually:
1135                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1136                 $dbw->update( 'page',
1137                         array( 'page_touched' => $dbw->timestamp($now) ),
1138                         array( 'page_namespace' => $talkns,
1139                                'page_title' => $ttl ),
1140                         $fname );
1141
1142                 # standard deferred updates
1143                 $this->editUpdates( $text, $summary, $isminor, $now );
1144
1145                 $oldid = 0; # new article
1146                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1147
1148                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text,
1149                         $summary, $isminor,
1150                         $watchthis, NULL ) );
1151                 wfProfileOut( $fname );
1152         }
1153
1154         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = '', $edittime = NULL) {
1155                 $this->replaceSection( $section, $text, $summary, $edittime );
1156         }
1157
1158         /**
1159          * @return string Complete article text, or null if error
1160          */
1161         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1162                 $fname = 'Article::replaceSection';
1163                 wfProfileIn( $fname );
1164
1165                 if ($section != '') {
1166                         if( is_null( $edittime ) ) {
1167                                 $rev = Revision::newFromTitle( $this->mTitle );
1168                         } else {
1169                                 $dbw =& wfGetDB( DB_MASTER );
1170                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1171                         }
1172                         if( is_null( $rev ) ) {
1173                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1174                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1175                                 return null;
1176                         }
1177                         $oldtext = $rev->getText();
1178
1179                         if($section=='new') {
1180                                 if($summary) $subject="== {$summary} ==\n\n";
1181                                 $text=$oldtext."\n\n".$subject.$text;
1182                         } else {
1183
1184                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1185                                 # comments to be stripped as well)
1186                                 $striparray=array();
1187                                 $parser=new Parser();
1188                                 $parser->mOutputType=OT_WIKI;
1189                                 $parser->mOptions = new ParserOptions();
1190                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1191
1192                                 # now that we can be sure that no pseudo-sections are in the source,
1193                                 # split it up
1194                                 # Unfortunately we can't simply do a preg_replace because that might
1195                                 # replace the wrong section, so we have to use the section counter instead
1196                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)(?!\S)/mi',
1197                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1198                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1199
1200                                 # section 0 is top (intro) section
1201                                 if($section!=0) {
1202
1203                                         # headline of old section - we need to go through this section
1204                                         # to determine if there are any subsections that now need to
1205                                         # be erased, as the mother section has been replaced with
1206                                         # the text of all subsections.
1207                                         $headline=$secs[$section*2-1];
1208                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$headline,$matches);
1209                                         $hlevel=$matches[1];
1210
1211                                         # determine headline level for wikimarkup headings
1212                                         if(strpos($hlevel,'=')!==false) {
1213                                                 $hlevel=strlen($hlevel);
1214                                         }
1215
1216                                         $secs[$section*2-1]=''; // erase old headline
1217                                         $count=$section+1;
1218                                         $break=false;
1219                                         while(!empty($secs[$count*2-1]) && !$break) {
1220
1221                                                 $subheadline=$secs[$count*2-1];
1222                                                 preg_match(
1223                                                  '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$subheadline,$matches);
1224                                                 $subhlevel=$matches[1];
1225                                                 if(strpos($subhlevel,'=')!==false) {
1226                                                         $subhlevel=strlen($subhlevel);
1227                                                 }
1228                                                 if($subhlevel > $hlevel) {
1229                                                         // erase old subsections
1230                                                         $secs[$count*2-1]='';
1231                                                         $secs[$count*2]='';
1232                                                 }
1233                                                 if($subhlevel <= $hlevel) {
1234                                                         $break=true;
1235                                                 }
1236                                                 $count++;
1237
1238                                         }
1239
1240                                 }
1241                                 $text=join('',$secs);
1242                                 # reinsert the stuff that we stripped out earlier
1243                                 $text=$parser->unstrip($text,$striparray);
1244                                 $text=$parser->unstripNoWiki($text,$striparray);
1245                         }
1246
1247                 }
1248                 wfProfileOut( $fname );
1249                 return $text;
1250         }
1251
1252         /**
1253          * Change an existing article. Puts the previous version back into the old table, updates RC
1254          * and all necessary caches, mostly via the deferred update array.
1255          *
1256          * It is possible to call this function from a command-line script, but note that you should
1257          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1258          */
1259         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1260                 global $wgOut, $wgUser;
1261                 global $wgDBtransactions, $wgMwRedir;
1262                 global $wgUseSquid, $wgInternalServer, $wgPostCommitUpdateList, $wgUseFileCache;
1263
1264                 $fname = 'Article::updateArticle';
1265                 wfProfileIn( $fname );
1266                 $good = true;
1267
1268                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1269                         &$summary, &$minor,
1270                         &$watchthis, &$sectionanchor ) ) ) {
1271                         wfDebug( "$fname: ArticleSave hook aborted save!\n" );
1272                         wfProfileOut( $fname );
1273                         return false;
1274                 }
1275
1276                 $isminor = ( $minor && $wgUser->isLoggedIn() );
1277                 if ( $this->isRedirect( $text ) ) {
1278                         # Remove all content but redirect
1279                         # This could be done by reconstructing the redirect from a title given by
1280                         # Title::newFromRedirect(), but then we wouldn't know which synonym the user
1281                         # wants to see
1282                         if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ')[^\\n]+)/i', $text, $m ) ) {
1283                                 $redir = 1;
1284                                 $text = $m[1] . "\n";
1285                         }
1286                 }
1287                 else { $redir = 0; }
1288
1289                 $text = $this->preSaveTransform( $text );
1290                 $dbw =& wfGetDB( DB_MASTER );
1291                 $now = wfTimestampNow();
1292
1293                 # Update article, but only if changed.
1294
1295                 # It's important that we either rollback or complete, otherwise an attacker could
1296                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1297                 # could conceivably have the same effect, especially if cur is locked for long periods.
1298                 if( !$wgDBtransactions ) {
1299                         $userAbort = ignore_user_abort( true );
1300                 }
1301
1302                 $oldtext = $this->getContent( true );
1303                 $oldsize = strlen( $oldtext );
1304                 $newsize = strlen( $text );
1305                 $lastRevision = 0;
1306
1307                 if ( 0 != strcmp( $text, $oldtext ) ) {
1308                         $this->mGoodAdjustment = $this->isCountable( $text )
1309                           - $this->isCountable( $oldtext );
1310                         $this->mTotalAdjustment = 0;
1311                         $now = wfTimestampNow();
1312
1313                         $lastRevision = $dbw->selectField(
1314                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1315
1316                         $revision = new Revision( array(
1317                                 'page'       => $this->getId(),
1318                                 'comment'    => $summary,
1319                                 'minor_edit' => $isminor,
1320                                 'text'       => $text
1321                                 ) );
1322
1323                         $dbw->immediateCommit();
1324                         $dbw->begin();
1325                         $revisionId = $revision->insertOn( $dbw );
1326
1327                         # Update page
1328                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1329
1330                         if( !$ok ) {
1331                                 /* Belated edit conflict! Run away!! */
1332                                 $good = false;
1333                                 $dbw->rollback();
1334                         } else {
1335                                 # Update recentchanges and purge cache and whatnot
1336                                 $bot = (int)($wgUser->isBot() || $forceBot);
1337                                 RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1338                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1339                                         $revisionId );
1340                                 Article::onArticleEdit( $this->mTitle );
1341                                 $dbw->commit();
1342                         }
1343                 }
1344
1345                 if( !$wgDBtransactions ) {
1346                         ignore_user_abort( $userAbort );
1347                 }
1348
1349                 if ( $good ) {
1350                         if ($watchthis) {
1351                                 if (!$this->mTitle->userIsWatching()) {
1352                                         $dbw->immediateCommit();
1353                                         $dbw->begin();
1354                                         $this->watch();
1355                                         $dbw->commit();
1356                                 }
1357                         } else {
1358                                 if ( $this->mTitle->userIsWatching() ) {
1359                                         $dbw->immediateCommit();
1360                                         $dbw->begin();
1361                                         $this->unwatch();
1362                                         $dbw->commit();
1363                                 }
1364                         }
1365                         # standard deferred updates
1366                         $this->editUpdates( $text, $summary, $minor, $now );
1367
1368
1369                         $urls = array();
1370                         # Template namespace
1371                         # Purge all articles linking here
1372                         if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
1373                                 $titles = $this->mTitle->getLinksTo();
1374                                 Title::touchArray( $titles );
1375                                 if ( $wgUseSquid ) {
1376                                                 foreach ( $titles as $title ) {
1377                                                         $urls[] = $title->getInternalURL();
1378                                                 }
1379                                 }
1380                         }
1381
1382                         # Squid updates
1383                         if ( $wgUseSquid ) {
1384                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1385                                 $u = new SquidUpdate( $urls );
1386                                 array_push( $wgPostCommitUpdateList, $u );
1387                         }
1388
1389                         # File cache
1390                         if ( $wgUseFileCache ) {
1391                                 $cm = new CacheManager($this->mTitle);
1392                                 @unlink($cm->fileCacheName());
1393                         }
1394
1395                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1396                 }
1397                 wfRunHooks( 'ArticleSaveComplete',
1398                         array( &$this, &$wgUser, $text,
1399                         $summary, $minor,
1400                         $watchthis, $sectionanchor ) );
1401                 wfProfileOut( $fname );
1402                 return $good;
1403         }
1404
1405         /**
1406          * After we've either updated or inserted the article, update
1407          * the link tables and redirect to the new page.
1408          */
1409         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1410                 global $wgUseDumbLinkUpdate, $wgAntiLockFlags, $wgOut, $wgUser, $wgLinkCache, $wgEnotif;
1411                 global $wgUseEnotif;
1412
1413                 $fname = 'Article::showArticle';
1414                 wfProfileIn( $fname );
1415
1416                 $wgLinkCache = new LinkCache();
1417
1418                 if ( !$wgUseDumbLinkUpdate ) {
1419                         # Preload links to reduce lock time
1420                         if ( $wgAntiLockFlags & ALF_PRELOAD_LINKS ) {
1421                                 $wgLinkCache->preFill( $this->mTitle );
1422                                 $wgLinkCache->clear();
1423                         }
1424                 }
1425
1426                 # Parse the text and save it to the parser cache
1427                 $wgOut = new OutputPage();
1428                 $wgOut->setParserOptions( ParserOptions::newFromUser( $wgUser ) );
1429                 $wgOut->addPrimaryWikiText( $text, $this );
1430
1431                 if ( !$wgUseDumbLinkUpdate ) {
1432                         # Move the current links back to the second register
1433                         $wgLinkCache->swapRegisters();
1434
1435                         # Get old version of link table to allow incremental link updates
1436                         # Lock this data now since it is needed for an update
1437                         $wgLinkCache->forUpdate( true );
1438                         $wgLinkCache->preFill( $this->mTitle );
1439
1440                         # Swap this old version back into its rightful place
1441                         $wgLinkCache->swapRegisters();
1442                 }
1443
1444                 if( $this->isRedirect( $text ) )
1445                         $r = 'redirect=no';
1446                 else
1447                         $r = '';
1448                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1449
1450                 if ( $wgUseEnotif  ) {
1451                         # this would be better as an extension hook
1452                         include_once( "UserMailer.php" );
1453                         $wgEnotif = new EmailNotification ();
1454                         $wgEnotif->notifyOnPageChange( $this->mTitle, $now, $summary, $me2, $oldid );
1455                 }
1456                 wfProfileOut( $fname );
1457         }
1458
1459         /**
1460          * Mark this particular edit as patrolled
1461          */
1462         function markpatrolled() {
1463                 global $wgOut, $wgRequest, $wgOnlySysopsCanPatrol, $wgUseRCPatrol, $wgUser;
1464                 $wgOut->setRobotpolicy( 'noindex,follow' );
1465
1466                 if ( !$wgUseRCPatrol )
1467                 {
1468                         $wgOut->errorpage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1469                         return;
1470                 }
1471                 if ( $wgUser->isAnon() )
1472                 {
1473                         $wgOut->loginToUse();
1474                         return;
1475                 }
1476                 if ( $wgOnlySysopsCanPatrol && !$wgUser->isAllowed('patrol') )
1477                 {
1478                         $wgOut->sysopRequired();
1479                         return;
1480                 }
1481                 $rcid = $wgRequest->getVal( 'rcid' );
1482                 if ( !is_null ( $rcid ) )
1483                 {
1484                         RecentChange::markPatrolled( $rcid );
1485                         $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1486                         $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1487
1488                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1489                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1490                 }
1491                 else
1492                 {
1493                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1494                 }
1495         }
1496
1497         /**
1498          * Validate function
1499          */
1500         function validate() {
1501                 global $wgOut, $wgUser, $wgRequest, $wgUseValidation;
1502
1503                 if ( !$wgUseValidation ) # Are we using article validation at all?
1504                 {
1505                         $wgOut->errorpage( "nosuchspecialpage", "nospecialpagetext" );
1506                         return ;
1507                 }
1508
1509                 $wgOut->setRobotpolicy( 'noindex,follow' );
1510                 $revision = $wgRequest->getVal( 'revision' );
1511
1512                 include_once ( "SpecialValidate.php" ) ; # The "Validation" class
1513
1514                 $v = new Validation ;
1515                 if ( $wgRequest->getVal ( "mode" , "" ) == "list" )
1516                         $t = $v->showList ( $this ) ;
1517                 else if ( $wgRequest->getVal ( "mode" , "" ) == "details" )
1518                         $t = $v->showDetails ( $this , $wgRequest->getVal( 'revision' ) ) ;
1519                 else
1520                         $t = $v->validatePageForm ( $this , $revision ) ;
1521
1522                 $wgOut->addHTML ( $t ) ;
1523         }
1524
1525         /**
1526          * Add this page to $wgUser's watchlist
1527          */
1528
1529         function watch() {
1530
1531                 global $wgUser, $wgOut;
1532
1533                 if ( $wgUser->isAnon() ) {
1534                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1535                         return;
1536                 }
1537                 if ( wfReadOnly() ) {
1538                         $wgOut->readOnlyPage();
1539                         return;
1540                 }
1541
1542                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1543
1544                         $wgUser->addWatch( $this->mTitle );
1545                         $wgUser->saveSettings();
1546
1547                         wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1548
1549                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1550                         $wgOut->setRobotpolicy( 'noindex,follow' );
1551
1552                         $link = $this->mTitle->getPrefixedText();
1553                         $text = wfMsg( 'addedwatchtext', $link );
1554                         $wgOut->addWikiText( $text );
1555                 }
1556
1557                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1558         }
1559
1560         /**
1561          * Stop watching a page
1562          */
1563
1564         function unwatch() {
1565
1566                 global $wgUser, $wgOut;
1567
1568                 if ( $wgUser->isAnon() ) {
1569                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1570                         return;
1571                 }
1572                 if ( wfReadOnly() ) {
1573                         $wgOut->readOnlyPage();
1574                         return;
1575                 }
1576
1577                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1578
1579                         $wgUser->removeWatch( $this->mTitle );
1580                         $wgUser->saveSettings();
1581
1582                         wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1583
1584                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1585                         $wgOut->setRobotpolicy( 'noindex,follow' );
1586
1587                         $link = $this->mTitle->getPrefixedText();
1588                         $text = wfMsg( 'removedwatchtext', $link );
1589                         $wgOut->addWikiText( $text );
1590                 }
1591
1592                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1593         }
1594
1595         /**
1596          * protect a page
1597          */
1598         function protect( $limit = 'sysop' ) {
1599                 global $wgUser, $wgOut, $wgRequest;
1600
1601                 if ( ! $wgUser->isAllowed('protect') ) {
1602                         $wgOut->sysopRequired();
1603                         return;
1604                 }
1605                 if ( wfReadOnly() ) {
1606                         $wgOut->readOnlyPage();
1607                         return;
1608                 }
1609                 $id = $this->mTitle->getArticleID();
1610                 if ( 0 == $id ) {
1611                         $wgOut->fatalError( wfMsg( 'badarticleerror' ) );
1612                         return;
1613                 }
1614
1615                 $confirm = $wgRequest->wasPosted() &&
1616                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1617                 $moveonly = $wgRequest->getBool( 'wpMoveOnly' );
1618                 $reason = $wgRequest->getText( 'wpReasonProtect' );
1619
1620                 if ( $confirm ) {
1621                         $dbw =& wfGetDB( DB_MASTER );
1622                         $dbw->update( 'page',
1623                                 array( /* SET */
1624                                         'page_touched' => $dbw->timestamp(),
1625                                         'page_restrictions' => (string)$limit
1626                                 ), array( /* WHERE */
1627                                         'page_id' => $id
1628                                 ), 'Article::protect'
1629                         );
1630
1631                         $restrictions = "move=" . $limit;
1632                         if( !$moveonly ) {
1633                                 $restrictions .= ":edit=" . $limit;
1634                         }
1635                         if (wfRunHooks('ArticleProtect', array(&$this, &$wgUser, $limit == 'sysop', $reason, $moveonly))) {
1636
1637                                 $dbw =& wfGetDB( DB_MASTER );
1638                                 $dbw->update( 'page',
1639                                                           array( /* SET */
1640                                                                          'page_touched' => $dbw->timestamp(),
1641                                                                          'page_restrictions' => $restrictions
1642                                                                          ), array( /* WHERE */
1643                                                                                            'page_id' => $id
1644                                                                                            ), 'Article::protect'
1645                                                           );
1646
1647                                 wfRunHooks('ArticleProtectComplete', array(&$this, &$wgUser, $limit == 'sysop', $reason, $moveonly));
1648
1649                                 $log = new LogPage( 'protect' );
1650                                 if ( $limit === '' ) {
1651                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1652                                 } else {
1653                                         $log->addEntry( 'protect', $this->mTitle, $reason );
1654                                 }
1655                                 $wgOut->redirect( $this->mTitle->getFullURL() );
1656                         }
1657                         return;
1658                 } else {
1659                         return $this->confirmProtect( '', '', $limit );
1660                 }
1661         }
1662
1663         /**
1664          * Output protection confirmation dialog
1665          */
1666         function confirmProtect( $par, $reason, $limit = 'sysop'  ) {
1667                 global $wgOut, $wgUser;
1668
1669                 wfDebug( "Article::confirmProtect\n" );
1670
1671                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1672                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1673
1674                 $check = '';
1675                 $protcom = '';
1676                 $moveonly = '';
1677
1678                 if ( $limit === '' ) {
1679                         $wgOut->setPageTitle( wfMsg( 'confirmunprotect' ) );
1680                         $wgOut->setSubtitle( wfMsg( 'unprotectsub', $sub ) );
1681                         $wgOut->addWikiText( wfMsg( 'confirmunprotecttext' ) );
1682                         $protcom = htmlspecialchars( wfMsg( 'unprotectcomment' ) );
1683                         $formaction = $this->mTitle->escapeLocalURL( 'action=unprotect' . $par );
1684                 } else {
1685                         $wgOut->setPageTitle( wfMsg( 'confirmprotect' ) );
1686                         $wgOut->setSubtitle( wfMsg( 'protectsub', $sub ) );
1687                         $wgOut->addWikiText( wfMsg( 'confirmprotecttext' ) );
1688                         $moveonly = htmlspecialchars( wfMsg( 'protectmoveonly' ) );
1689                         $protcom = htmlspecialchars( wfMsg( 'protectcomment' ) );
1690                         $formaction = $this->mTitle->escapeLocalURL( 'action=protect' . $par );
1691                 }
1692
1693                 $confirm = htmlspecialchars( wfMsg( 'protectpage' ) );
1694                 $token = htmlspecialchars( $wgUser->editToken() );
1695
1696                 $wgOut->addHTML( "
1697 <form id='protectconfirm' method='post' action=\"{$formaction}\">
1698         <table border='0'>
1699                 <tr>
1700                         <td align='right'>
1701                                 <label for='wpReasonProtect'>{$protcom}:</label>
1702                         </td>
1703                         <td align='left'>
1704                                 <input type='text' size='60' name='wpReasonProtect' id='wpReasonProtect' value=\"" . htmlspecialchars( $reason ) . "\" />
1705                         </td>
1706                 </tr>" );
1707                 if($moveonly != '') {
1708                         $wgOut->AddHTML( "
1709                 <tr>
1710                         <td align='right'>
1711                                 <input type='checkbox' name='wpMoveOnly' value='1' id='wpMoveOnly' />
1712                         </td>
1713                         <td align='left'>
1714                                 <label for='wpMoveOnly'>{$moveonly}</label>
1715                         </td>
1716                 </tr> " );
1717                 }
1718                 $wgOut->addHTML( "
1719                 <tr>
1720                         <td>&nbsp;</td>
1721                         <td>
1722                                 <input type='submit' name='wpConfirmProtectB' value=\"{$confirm}\" />
1723                         </td>
1724                 </tr>
1725         </table>
1726         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1727 </form>" );
1728
1729                 $wgOut->returnToMain( false );
1730         }
1731
1732         /**
1733          * Unprotect the pages
1734          */
1735         function unprotect() {
1736                 return $this->protect( '' );
1737         }
1738
1739         /*
1740          * UI entry point for page deletion
1741          */
1742         function delete() {
1743                 global $wgUser, $wgOut, $wgMessageCache, $wgRequest;
1744                 $fname = 'Article::delete';
1745                 $confirm = $wgRequest->wasPosted() &&
1746                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1747                 $reason = $wgRequest->getText( 'wpReason' );
1748
1749                 # This code desperately needs to be totally rewritten
1750
1751                 # Check permissions
1752                 if( ( !$wgUser->isAllowed( 'delete' ) ) ) {
1753                         $wgOut->sysopRequired();
1754                         return;
1755                 }
1756                 if( wfReadOnly() ) {
1757                         $wgOut->readOnlyPage();
1758                         return;
1759                 }
1760
1761                 # Better double-check that it hasn't been deleted yet!
1762                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1763                 if( !$this->mTitle->exists() ) {
1764                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1765                         return;
1766                 }
1767
1768                 if( $confirm ) {
1769                         $this->doDelete( $reason );
1770                         return;
1771                 }
1772
1773                 # determine whether this page has earlier revisions
1774                 # and insert a warning if it does
1775                 # we select the text because it might be useful below
1776                 $dbr =& $this->getDB();
1777                 $ns = $this->mTitle->getNamespace();
1778                 $title = $this->mTitle->getDBkey();
1779                 $revisions = $dbr->select( array( 'page', 'revision' ),
1780                         array( 'rev_id', 'rev_user_text' ),
1781                         array(
1782                                 'page_namespace' => $ns,
1783                                 'page_title' => $title,
1784                                 'rev_page = page_id'
1785                         ), $fname, $this->getSelectOptions( array( 'ORDER BY' => 'rev_timestamp DESC' ) )
1786                 );
1787
1788                 if( $dbr->numRows( $revisions ) > 1 && !$confirm ) {
1789                         $skin=$wgUser->getSkin();
1790                         $wgOut->addHTML('<b>'.wfMsg('historywarning'));
1791                         $wgOut->addHTML( $skin->historyLink() .'</b>');
1792                 }
1793
1794                 # Fetch cur_text
1795                 $rev = Revision::newFromTitle( $this->mTitle );
1796
1797                 # Fetch name(s) of contributors
1798                 $rev_name = '';
1799                 $all_same_user = true;
1800                 while( $row = $dbr->fetchObject( $revisions ) ) {
1801                         if( $rev_name != '' && $rev_name != $row->rev_user_text ) {
1802                                 $all_same_user = false;
1803                         } else {
1804                                 $rev_name = $row->rev_user_text;
1805                         }
1806                 }
1807
1808                 if( !is_null( $rev ) ) {
1809                         # if this is a mini-text, we can paste part of it into the deletion reason
1810                         $text = $rev->getText();
1811
1812                         #if this is empty, an earlier revision may contain "useful" text
1813                         $blanked = false;
1814                         if( $text == '' ) {
1815                                 $prev = $rev->getPrevious();
1816                                 if( $prev ) {
1817                                         $text = $prev->getText();
1818                                         $blanked = true;
1819                                 }
1820                         }
1821
1822                         $length = strlen( $text );
1823
1824                         # this should not happen, since it is not possible to store an empty, new
1825                         # page. Let's insert a standard text in case it does, though
1826                         if( $length == 0 && $reason === '' ) {
1827                                 $reason = wfMsgForContent( 'exblank' );
1828                         }
1829
1830                         if( $length < 500 && $reason === '' ) {
1831                                 # comment field=255, let's grep the first 150 to have some user
1832                                 # space left
1833                                 global $wgContLang;
1834                                 $text = $wgContLang->truncate( $text, 150, '...' );
1835
1836                                 # let's strip out newlines
1837                                 $text = preg_replace( "/[\n\r]/", '', $text );
1838
1839                                 if( !$blanked ) {
1840                                         if( !$all_same_user ) {
1841                                                 $reason = wfMsgForContent( 'excontent', $text );
1842                                         } else {
1843                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $rev_name );
1844                                         }
1845                                 } else {
1846                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1847                                 }
1848                         }
1849                 }
1850
1851                 return $this->confirmDelete( '', $reason );
1852         }
1853
1854         /**
1855          * Output deletion confirmation dialog
1856          */
1857         function confirmDelete( $par, $reason ) {
1858                 global $wgOut, $wgUser;
1859
1860                 wfDebug( "Article::confirmDelete\n" );
1861
1862                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1863                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1864                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1865                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1866
1867                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1868
1869                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1870                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1871                 $token = htmlspecialchars( $wgUser->editToken() );
1872
1873                 $wgOut->addHTML( "
1874 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1875         <table border='0'>
1876                 <tr>
1877                         <td align='right'>
1878                                 <label for='wpReason'>{$delcom}:</label>
1879                         </td>
1880                         <td align='left'>
1881                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1882                         </td>
1883                 </tr>
1884                 <tr>
1885                         <td>&nbsp;</td>
1886                         <td>
1887                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1888                         </td>
1889                 </tr>
1890         </table>
1891         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1892 </form>\n" );
1893
1894                 $wgOut->returnToMain( false );
1895         }
1896
1897
1898         /**
1899          * Perform a deletion and output success or failure messages
1900          */
1901         function doDelete( $reason ) {
1902                 global $wgOut, $wgUser, $wgContLang;
1903                 $fname = 'Article::doDelete';
1904                 wfDebug( $fname."\n" );
1905
1906                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1907                         if ( $this->doDeleteArticle( $reason ) ) {
1908                                 $deleted = $this->mTitle->getPrefixedText();
1909
1910                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1911                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1912
1913                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
1914                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
1915
1916                                 $wgOut->addWikiText( $text );
1917                                 $wgOut->returnToMain( false );
1918                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
1919                         } else {
1920                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1921                         }
1922                 }
1923         }
1924
1925         /**
1926          * Back-end article deletion
1927          * Deletes the article with database consistency, writes logs, purges caches
1928          * Returns success
1929          */
1930         function doDeleteArticle( $reason ) {
1931                 global $wgUser;
1932                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer, $wgPostCommitUpdateList;
1933                 global $wgUseTrackbacks;
1934
1935                 $fname = 'Article::doDeleteArticle';
1936                 wfDebug( $fname."\n" );
1937
1938                 $dbw =& wfGetDB( DB_MASTER );
1939                 $ns = $this->mTitle->getNamespace();
1940                 $t = $this->mTitle->getDBkey();
1941                 $id = $this->mTitle->getArticleID();
1942
1943                 if ( $t == '' || $id == 0 ) {
1944                         return false;
1945                 }
1946
1947                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ), -1 );
1948                 array_push( $wgDeferredUpdateList, $u );
1949
1950                 $linksTo = $this->mTitle->getLinksTo();
1951
1952                 # Squid purging
1953                 if ( $wgUseSquid ) {
1954                         $urls = array(
1955                                 $this->mTitle->getInternalURL(),
1956                                 $this->mTitle->getInternalURL( 'history' )
1957                         );
1958
1959                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
1960                         array_push( $wgPostCommitUpdateList, $u );
1961
1962                 }
1963
1964                 # Client and file cache invalidation
1965                 Title::touchArray( $linksTo );
1966
1967
1968                 // For now, shunt the revision data into the archive table.
1969                 // Text is *not* removed from the text table; bulk storage
1970                 // is left intact to avoid breaking block-compression or
1971                 // immutable storage schemes.
1972                 //
1973                 // For backwards compatibility, note that some older archive
1974                 // table entries will have ar_text and ar_flags fields still.
1975                 //
1976                 // In the future, we may keep revisions and mark them with
1977                 // the rev_deleted field, which is reserved for this purpose.
1978                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1979                         array(
1980                                 'ar_namespace'  => 'page_namespace',
1981                                 'ar_title'      => 'page_title',
1982                                 'ar_comment'    => 'rev_comment',
1983                                 'ar_user'       => 'rev_user',
1984                                 'ar_user_text'  => 'rev_user_text',
1985                                 'ar_timestamp'  => 'rev_timestamp',
1986                                 'ar_minor_edit' => 'rev_minor_edit',
1987                                 'ar_rev_id'     => 'rev_id',
1988                                 'ar_text_id'    => 'rev_text_id',
1989                         ), array(
1990                                 'page_id' => $id,
1991                                 'page_id = rev_page'
1992                         ), $fname
1993                 );
1994
1995                 # Now that it's safely backed up, delete it
1996                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
1997                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
1998
1999                 if ($wgUseTrackbacks)
2000                         $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), $fname );
2001
2002                 # Clean up recentchanges entries...
2003                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
2004
2005                 # Finally, clean up the link tables
2006                 $t = $this->mTitle->getPrefixedDBkey();
2007
2008                 Article::onArticleDelete( $this->mTitle );
2009
2010                 # Delete outgoing links
2011                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2012                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2013                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2014
2015                 # Log the deletion
2016                 $log = new LogPage( 'delete' );
2017                 $log->addEntry( 'delete', $this->mTitle, $reason );
2018
2019                 # Clear the cached article id so the interface doesn't act like we exist
2020                 $this->mTitle->resetArticleID( 0 );
2021                 $this->mTitle->mArticleID = 0;
2022                 return true;
2023         }
2024
2025         /**
2026          * Revert a modification
2027          */
2028         function rollback() {
2029                 global $wgUser, $wgOut, $wgRequest;
2030                 $fname = 'Article::rollback';
2031
2032                 if ( ! $wgUser->isAllowed('rollback') ) {
2033                         $wgOut->sysopRequired();
2034                         return;
2035                 }
2036                 if ( wfReadOnly() ) {
2037                         $wgOut->readOnlyPage( $this->getContent( true ) );
2038                         return;
2039                 }
2040                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2041                         array( $this->mTitle->getPrefixedText(),
2042                                 $wgRequest->getVal( 'from' ) )  ) ) {
2043                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2044                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2045                         return;
2046                 }
2047                 $dbw =& wfGetDB( DB_MASTER );
2048
2049                 # Enhanced rollback, marks edits rc_bot=1
2050                 $bot = $wgRequest->getBool( 'bot' );
2051
2052                 # Replace all this user's current edits with the next one down
2053                 $tt = $this->mTitle->getDBKey();
2054                 $n = $this->mTitle->getNamespace();
2055
2056                 # Get the last editor, lock table exclusively
2057                 $dbw->begin();
2058                 $current = Revision::newFromTitle( $this->mTitle );
2059                 if( is_null( $current ) ) {
2060                         # Something wrong... no page?
2061                         $dbw->rollback();
2062                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2063                         return;
2064                 }
2065
2066                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2067                 if( $from != $current->getUserText() ) {
2068                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2069                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2070                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2071                                 htmlspecialchars( $from ),
2072                                 htmlspecialchars( $current->getUserText() ) ) );
2073                         if( $current->getComment() != '') {
2074                                 $wgOut->addHTML(
2075                                         wfMsg( 'editcomment',
2076                                         htmlspecialchars( $current->getComment() ) ) );
2077                         }
2078                         return;
2079                 }
2080
2081                 # Get the last edit not by this guy
2082                 $user = intval( $current->getUser() );
2083                 $user_text = $dbw->addQuotes( $current->getUserText() );
2084                 $s = $dbw->selectRow( 'revision',
2085                         array( 'rev_id', 'rev_timestamp' ),
2086                         array(
2087                                 'rev_page' => $current->getPage(),
2088                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2089                         ), $fname,
2090                         array(
2091                                 'USE INDEX' => 'page_timestamp',
2092                                 'ORDER BY'  => 'rev_timestamp DESC' )
2093                         );
2094                 if( $s === false ) {
2095                         # Something wrong
2096                         $dbw->rollback();
2097                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2098                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2099                         return;
2100                 }
2101
2102                 if ( $bot ) {
2103                         # Mark all reverted edits as bot
2104                         $dbw->update( 'recentchanges',
2105                                 array( /* SET */
2106                                         'rc_bot' => 1
2107                                 ), array( /* WHERE */
2108                                         'rc_cur_id'    => $current->getPage(),
2109                                         'rc_user_text' => $current->getUserText(),
2110                                         "rc_timestamp > '{$s->rev_timestamp}'",
2111                                 ), $fname
2112                         );
2113                 }
2114
2115                 # Save it!
2116                 $target = Revision::newFromId( $s->rev_id );
2117                 $newcomment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2118
2119                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2120                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2121                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newcomment ) . "</h2>\n<hr />\n" );
2122
2123                 $this->updateArticle( $target->getText(), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
2124                 Article::onArticleEdit( $this->mTitle );
2125
2126                 $dbw->commit();
2127                 $wgOut->returnToMain( false );
2128         }
2129
2130
2131         /**
2132          * Do standard deferred updates after page view
2133          * @private
2134          */
2135         function viewUpdates() {
2136                 global $wgDeferredUpdateList, $wgUseEnotif;
2137
2138                 if ( 0 != $this->getID() ) {
2139                         global $wgDisableCounters;
2140                         if( !$wgDisableCounters ) {
2141                                 Article::incViewCount( $this->getID() );
2142                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2143                                 array_push( $wgDeferredUpdateList, $u );
2144                         }
2145                 }
2146
2147                 # Update newtalk status if user is reading their own
2148                 # talk page
2149
2150                 global $wgUser;
2151                 if ($this->mTitle->getNamespace() == NS_USER_TALK &&
2152                         $this->mTitle->getText() == $wgUser->getName())
2153                 {
2154                         if ( $wgUseEnotif ) {
2155                                 require_once( 'UserTalkUpdate.php' );
2156                                 $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(), $this->mTitle->getDBkey(), false, false, false );
2157                         } else {
2158                                 $wgUser->setNewtalk(0);
2159                                 $wgUser->saveNewtalk();
2160                         }
2161                 } elseif ( $wgUseEnotif ) {
2162                         $wgUser->clearNotification( $this->mTitle );
2163                 }
2164
2165         }
2166
2167         /**
2168          * Do standard deferred updates after page edit.
2169          * Every 1000th edit, prune the recent changes table.
2170          * @private
2171          * @param string $text
2172          */
2173         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange) {
2174                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
2175                 global $wgMessageCache, $wgUser, $wgUseEnotif;
2176
2177
2178                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', &$this ) ) {
2179                         wfSeedRandom();
2180                         if ( 0 == mt_rand( 0, 999 ) ) {
2181                                 # Periodically flush old entries from the recentchanges table.
2182                                 global $wgRCMaxAge;
2183
2184                                 $dbw =& wfGetDB( DB_MASTER );
2185                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2186                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2187                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2188                                 $dbw->query( $sql );
2189                         }
2190                 }
2191
2192                 $id = $this->getID();
2193                 $title = $this->mTitle->getPrefixedDBkey();
2194                 $shortTitle = $this->mTitle->getDBkey();
2195
2196                 if ( 0 != $id ) {
2197                         $u = new LinksUpdate( $id, $title );
2198                         array_push( $wgDeferredUpdateList, $u );
2199                         $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2200                         array_push( $wgDeferredUpdateList, $u );
2201                         $u = new SearchUpdate( $id, $title, $text );
2202                         array_push( $wgDeferredUpdateList, $u );
2203
2204                         # If this is another user's talk page, update newtalk
2205
2206                         if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2207                                 if ( $wgUseEnotif ) {
2208                                         require_once( 'UserTalkUpdate.php' );
2209                                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle, $summary,
2210                                           $minoredit, $timestamp_of_pagechange);
2211                                 } else {
2212                                         $other = User::newFromName( $shortTitle );
2213                                         if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2214                                                 // An anonymous user
2215                                                 $other = new User();
2216                                                 $other->setName( $shortTitle );
2217                                         }
2218                                         if( $other ) {
2219                                                 $other->setNewtalk(1);
2220                                                 $other->saveNewtalk();
2221                                         }
2222                                 }
2223                         }
2224
2225                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2226                                 $wgMessageCache->replace( $shortTitle, $text );
2227                         }
2228                 }
2229         }
2230
2231         /**
2232          * @todo document this function
2233          * @private
2234          * @param string $oldid         Revision ID of this article revision
2235          */
2236         function setOldSubtitle( $oldid=0 ) {
2237                 global $wgLang, $wgOut, $wgUser;
2238
2239                 $current = ( $oldid == $this->mLatest );
2240                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2241                 $sk = $wgUser->getSkin();
2242                 $lnk = $current
2243                         ? wfMsg( 'currentrevisionlink' )
2244                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2245                 $prevlink = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid );
2246                 $nextlink = $current
2247                         ? wfMsg( 'nextrevision' )
2248                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2249                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2250                 $wgOut->setSubtitle( $r );
2251         }
2252
2253         /**
2254          * This function is called right before saving the wikitext,
2255          * so we can do things like signatures and links-in-context.
2256          *
2257          * @param string $text
2258          */
2259         function preSaveTransform( $text ) {
2260                 global $wgParser, $wgUser;
2261                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2262         }
2263
2264         /* Caching functions */
2265
2266         /**
2267          * checkLastModified returns true if it has taken care of all
2268          * output to the client that is necessary for this request.
2269          * (that is, it has sent a cached version of the page)
2270          */
2271         function tryFileCache() {
2272                 static $called = false;
2273                 if( $called ) {
2274                         wfDebug( " tryFileCache() -- called twice!?\n" );
2275                         return;
2276                 }
2277                 $called = true;
2278                 if($this->isFileCacheable()) {
2279                         $touched = $this->mTouched;
2280                         $cache = new CacheManager( $this->mTitle );
2281                         if($cache->isFileCacheGood( $touched )) {
2282                                 global $wgOut;
2283                                 wfDebug( " tryFileCache() - about to load\n" );
2284                                 $cache->loadFromFileCache();
2285                                 return true;
2286                         } else {
2287                                 wfDebug( " tryFileCache() - starting buffer\n" );
2288                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2289                         }
2290                 } else {
2291                         wfDebug( " tryFileCache() - not cacheable\n" );
2292                 }
2293         }
2294
2295         /**
2296          * Check if the page can be cached
2297          * @return bool
2298          */
2299         function isFileCacheable() {
2300                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2301                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2302
2303                 return $wgUseFileCache
2304                         and (!$wgShowIPinHeader)
2305                         and ($this->getID() != 0)
2306                         and ($wgUser->isAnon())
2307                         and (!$wgUser->getNewtalk())
2308                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2309                         and (empty( $action ) || $action == 'view')
2310                         and (!isset($oldid))
2311                         and (!isset($diff))
2312                         and (!isset($redirect))
2313                         and (!isset($printable))
2314                         and (!$this->mRedirectedFrom);
2315         }
2316
2317         /**
2318          * Loads cur_touched and returns a value indicating if it should be used
2319          *
2320          */
2321         function checkTouched() {
2322                 $fname = 'Article::checkTouched';
2323                 if( !$this->mDataLoaded ) {
2324                         $dbr =& $this->getDB();
2325                         $data = $this->pageDataFromId( $dbr, $this->getId() );
2326                         if( $data ) {
2327                                 $this->loadPageData( $data );
2328                         }
2329                 }
2330                 return !$this->mIsRedirect;
2331         }
2332
2333         /**
2334          * Edit an article without doing all that other stuff
2335          * The article must already exist; link tables etc
2336          * are not updated, caches are not flushed.
2337          *
2338          * @param string $text text submitted
2339          * @param string $comment comment submitted
2340          * @param bool $minor whereas it's a minor modification
2341          */
2342         function quickEdit( $text, $comment = '', $minor = 0 ) {
2343                 $fname = 'Article::quickEdit';
2344                 wfProfileIn( $fname );
2345
2346                 $dbw =& wfGetDB( DB_MASTER );
2347                 $dbw->begin();
2348                 $revision = new Revision( array(
2349                         'page'       => $this->getId(),
2350                         'text'       => $text,
2351                         'comment'    => $comment,
2352                         'minor_edit' => $minor ? 1 : 0,
2353                         ) );
2354                 $revisionId = $revision->insertOn( $dbw );
2355                 $this->updateRevisionOn( $dbw, $revision );
2356                 $dbw->commit();
2357
2358                 wfProfileOut( $fname );
2359         }
2360
2361         /**
2362          * Used to increment the view counter
2363          *
2364          * @static
2365          * @param integer $id article id
2366          */
2367         function incViewCount( $id ) {
2368                 $id = intval( $id );
2369                 global $wgHitcounterUpdateFreq;
2370
2371                 $dbw =& wfGetDB( DB_MASTER );
2372                 $pageTable = $dbw->tableName( 'page' );
2373                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2374                 $acchitsTable = $dbw->tableName( 'acchits' );
2375
2376                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2377                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2378                         return;
2379                 }
2380
2381                 # Not important enough to warrant an error page in case of failure
2382                 $oldignore = $dbw->ignoreErrors( true );
2383
2384                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2385
2386                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2387                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2388                         # Most of the time (or on SQL errors), skip row count check
2389                         $dbw->ignoreErrors( $oldignore );
2390                         return;
2391                 }
2392
2393                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2394                 $row = $dbw->fetchObject( $res );
2395                 $rown = intval( $row->n );
2396                 if( $rown >= $wgHitcounterUpdateFreq ){
2397                         wfProfileIn( 'Article::incViewCount-collect' );
2398                         $old_user_abort = ignore_user_abort( true );
2399
2400                         $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2401                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable TYPE=HEAP ".
2402                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2403                                 'GROUP BY hc_id');
2404                         $dbw->query("DELETE FROM $hitcounterTable");
2405                         $dbw->query('UNLOCK TABLES');
2406                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2407                                 'WHERE page_id = hc_id');
2408                         $dbw->query("DROP TABLE $acchitsTable");
2409
2410                         ignore_user_abort( $old_user_abort );
2411                         wfProfileOut( 'Article::incViewCount-collect' );
2412                 }
2413                 $dbw->ignoreErrors( $oldignore );
2414         }
2415
2416         /**#@+
2417          * The onArticle*() functions are supposed to be a kind of hooks
2418          * which should be called whenever any of the specified actions
2419          * are done.
2420          *
2421          * This is a good place to put code to clear caches, for instance.
2422          *
2423          * This is called on page move and undelete, as well as edit
2424          * @static
2425          * @param $title_obj a title object
2426          */
2427
2428         function onArticleCreate($title_obj) {
2429                 global $wgUseSquid, $wgPostCommitUpdateList;
2430
2431                 $title_obj->touchLinks();
2432                 $titles = $title_obj->getLinksTo();
2433
2434                 # Purge squid
2435                 if ( $wgUseSquid ) {
2436                         $urls = $title_obj->getSquidURLs();
2437                         foreach ( $titles as $linkTitle ) {
2438                                 $urls[] = $linkTitle->getInternalURL();
2439                         }
2440                         $u = new SquidUpdate( $urls );
2441                         array_push( $wgPostCommitUpdateList, $u );
2442                 }
2443         }
2444
2445         function onArticleDelete( $title ) {
2446                 global $wgMessageCache;
2447
2448                 $title->touchLinks();
2449
2450                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2451                         $wgMessageCache->replace( $title->getDBkey(), false );
2452                 }
2453         }
2454
2455         function onArticleEdit($title_obj) {
2456                 // This would be an appropriate place to purge caches.
2457                 // Why's this not in here now?
2458         }
2459
2460         /**#@-*/
2461
2462         /**
2463          * Info about this page
2464          * Called for ?action=info when $wgAllowPageInfo is on.
2465          *
2466          * @access public
2467          */
2468         function info() {
2469                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2470                 $fname = 'Article::info';
2471
2472                 if ( !$wgAllowPageInfo ) {
2473                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2474                         return;
2475                 }
2476
2477                 $page = $this->mTitle->getSubjectPage();
2478
2479                 $wgOut->setPagetitle( $page->getPrefixedText() );
2480                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2481
2482                 # first, see if the page exists at all.
2483                 $exists = $page->getArticleId() != 0;
2484                 if( !$exists ) {
2485                         $wgOut->addHTML( wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2486                 } else {
2487                         $dbr =& $this->getDB( DB_SLAVE );
2488                         $wl_clause = array(
2489                                 'wl_title'     => $page->getDBkey(),
2490                                 'wl_namespace' => $page->getNamespace() );
2491                         $numwatchers = $dbr->selectField(
2492                                 'watchlist',
2493                                 'COUNT(*)',
2494                                 $wl_clause,
2495                                 $fname,
2496                                 $this->getSelectOptions() );
2497
2498                         $pageInfo = $this->pageCountInfo( $page );
2499                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2500
2501                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2502                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2503                         if( $talkInfo ) {
2504                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2505                         }
2506                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2507                         if( $talkInfo ) {
2508                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2509                         }
2510                         $wgOut->addHTML( '</ul>' );
2511
2512                 }
2513         }
2514
2515         /**
2516          * Return the total number of edits and number of unique editors
2517          * on a given page. If page does not exist, returns false.
2518          *
2519          * @param Title $title
2520          * @return array
2521          * @access private
2522          */
2523         function pageCountInfo( $title ) {
2524                 $id = $title->getArticleId();
2525                 if( $id == 0 ) {
2526                         return false;
2527                 }
2528
2529                 $dbr =& $this->getDB( DB_SLAVE );
2530
2531                 $rev_clause = array( 'rev_page' => $id );
2532                 $fname = 'Article::pageCountInfo';
2533
2534                 $edits = $dbr->selectField(
2535                         'revision',
2536                         'COUNT(rev_page)',
2537                         $rev_clause,
2538                         $fname,
2539                         $this->getSelectOptions() );
2540
2541                 $authors = $dbr->selectField(
2542                         'revision',
2543                         'COUNT(DISTINCT rev_user_text)',
2544                         $rev_clause,
2545                         $fname,
2546                         $this->getSelectOptions() );
2547
2548                 return array( 'edits' => $edits, 'authors' => $authors );
2549         }
2550
2551         /**
2552          * Return a list of templates used by this article.
2553          * Uses the links table to find the templates
2554          *
2555          * @return array
2556          */
2557         function getUsedTemplates() {
2558                 $result = array();
2559                 $id = $this->mTitle->getArticleID();
2560
2561                 $db =& wfGetDB( DB_SLAVE );
2562                 $res = $db->select( array( 'pagelinks' ),
2563                         array( 'pl_title' ),
2564                         array(
2565                                 'pl_from' => $id,
2566                                 'pl_namespace' => NS_TEMPLATE ),
2567                         'Article:getUsedTemplates' );
2568                 if ( false !== $res ) {
2569                         if ( $db->numRows( $res ) ) {
2570                                 while ( $row = $db->fetchObject( $res ) ) {
2571                                         $result[] = $row->pl_title;
2572                                 }
2573                         }
2574                 }
2575                 $db->freeResult( $res );
2576                 return $result;
2577         }
2578 }
2579
2580 ?>