includes/Article.php

   1 <?php
   2 # Class representing a Wikipedia article and history.
   3 # See design.doc for an overview.
   4
   5 # Note: edit user interface and cache support functions have been
   6 # moved to separate EditPage and CacheManager classes.
   7
   8 include_once( "CacheManager.php" );
   9
  10 class Article {
  11         /* private */ var $mContent, $mContentLoaded;
  12         /* private */ var $mUser, $mTimestamp, $mUserText;
  13         /* private */ var $mCounter, $mComment, $mCountAdjustment;
  14         /* private */ var $mMinorEdit, $mRedirectedFrom;
  15         /* private */ var $mTouched, $mFileCache, $mTitle;
  16         /* private */ var $mId, $mTable;
  17
  18         function Article( &$title ) {
  19                 $this->mTitle =& $title;
  20                 $this->clear();
  21         }
  22
  23         /* private */ function clear()
  24         {
  25                 $this->mContentLoaded = false;
  26                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
  27                 $this->mRedirectedFrom = $this->mUserText =
  28                 $this->mTimestamp = $this->mComment = $this->mFileCache = "";
  29                 $this->mCountAdjustment = 0;
  30                 $this->mTouched = "19700101000000";
  31         }
  32
  33         /* static */ function getRevisionText( $row, $prefix = "old_" ) {
  34                 # Deal with optional compression of archived pages.
  35                 # This can be done periodically via maintenance/compressOld.php, and
  36                 # as pages are saved if $wgCompressRevisions is set.
  37                 $text = $prefix . "text";
  38                 $flags = $prefix . "flags";
  39                 if( isset( $row->$flags ) && (false !== strpos( $row->$flags, "gzip" ) ) ) {
  40                         return gzinflate( $row->$text );
  41                 }
  42                 if( isset( $row->$text ) ) {
  43                         return $row->$text;
  44                 }
  45                 return false;
  46         }
  47
  48         /* static */ function compressRevisionText( &$text ) {
  49                 global $wgCompressRevisions;
  50                 if( !$wgCompressRevisions ) {
  51                         return "";
  52                 }
  53                 if( !function_exists( "gzdeflate" ) ) {
  54                         wfDebug( "Article::compressRevisionText() -- no zlib support, not compressing\n" );
  55                         return "";
  56                 }
  57                 $text = gzdeflate( $text );
  58                 return "gzip";
  59         }
  60
  61         # Note that getContent/loadContent may follow redirects if
  62         # not told otherwise, and so may cause a change to mTitle.
  63
  64         # Return the text of this revision
  65         function getContent( $noredir = false )
  66         {
  67                 global $wgRequest;
  68
  69                 # Get variables from query string :P
  70                 $action = $wgRequest->getText( 'action', 'view' );
  71                 $section = $wgRequest->getText( 'section' );
  72
  73                 $fname =  "Article::getContent";
  74                 wfProfileIn( $fname );
  75
  76                 if ( 0 == $this->getID() ) {
  77                         if ( "edit" == $action ) {
  78                                 wfProfileOut( $fname );
  79                                 return ""; # was "newarticletext", now moved above the box)
  80                         }
  81                         wfProfileOut( $fname );
  82                         return wfMsg( "noarticletext" );
  83                 } else {
  84                         $this->loadContent( $noredir );
  85
  86                         if(
  87                                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
  88                                 ( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
  89                                   preg_match("/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/",$this->mTitle->getText()) &&
  90                                   $action=="view"
  91                                 )
  92                                 {
  93                                 wfProfileOut( $fname );
  94                                 return $this->mContent . "\n" .wfMsg("anontalkpagetext"); }
  95                         else {
  96                                 if($action=="edit") {
  97                                         if($section!="") {
  98                                                 if($section=="new") {
  99                                                         wfProfileOut( $fname );
 100                                                         return "";
 101                                                 }
 102
 103                                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 104                                                  $this->mContent, -1,
 105                                                  PREG_SPLIT_DELIM_CAPTURE);
 106                                                 if($section==0) {
 107                                                         wfProfileOut( $fname );
 108                                                         return trim($secs[0]);
 109                                                 } else {
 110                                                         wfProfileOut( $fname );
 111                                                         return trim($secs[$section*2-1] . $secs[$section*2]);
 112                                                 }
 113                                         }
 114                                 }
 115                                 wfProfileOut( $fname );
 116                                 return $this->mContent;
 117                         }
 118                 }
 119         }
 120
 121         # Load the revision (including cur_text) into this object
 122         function loadContent( $noredir = false )
 123         {
 124                 global $wgOut, $wgMwRedir, $wgRequest;
 125
 126                 # Query variables :P
 127                 $oldid = $wgRequest->getVal( 'oldid' );
 128                 $redirect = $wgRequest->getVal( 'redirect' );
 129
 130                 if ( $this->mContentLoaded ) return;
 131                 $fname = "Article::loadContent";
 132
 133                 # Pre-fill content with error message so that if something
 134                 # fails we'll have something telling us what we intended.
 135
 136                 $t = $this->mTitle->getPrefixedText();
 137                 if ( isset( $oldid ) ) {
 138                         $oldid = IntVal( $oldid );
 139                         $t .= ",oldid={$oldid}";
 140                 }
 141                 if ( isset( $redirect ) ) {
 142                         $redirect = ($redirect == "no") ? "no" : "yes";
 143                         $t .= ",redirect={$redirect}";
 144                 }
 145                 $this->mContent = wfMsg( "missingarticle", $t );
 146
 147                 if ( ! $oldid ) {       # Retrieve current version
 148                         $id = $this->getID();
 149                         if ( 0 == $id ) return;
 150
 151                         $sql = "SELECT " .
 152                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 153                           "FROM cur WHERE cur_id={$id}";
 154                         wfDebug( "$sql\n" );
 155                         $res = wfQuery( $sql, DB_READ, $fname );
 156                         if ( 0 == wfNumRows( $res ) ) {
 157                                 return;
 158                         }
 159
 160                         $s = wfFetchObject( $res );
 161                         # If we got a redirect, follow it (unless we've been told
 162                         # not to by either the function parameter or the query
 163                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 164                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 165                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 166                                   $s->cur_text, $m ) ) {
 167                                         $rt = Title::newFromText( $m[1] );
 168                                         if( $rt ) {
 169                                                 # Gotta hand redirects to special pages differently:
 170                                                 # Fill the HTTP response "Location" header and ignore
 171                                                 # the rest of the page we're on.
 172
 173                                                 if ( $rt->getInterwiki() != "" ) {
 174                                                         $wgOut->redirect( $rt->getFullURL() ) ;
 175                                                         return;
 176                                                 }
 177                                                 if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 178                                                         $wgOut->redirect( $rt->getFullURL() );
 179                                                         return;
 180                                                 }
 181                                                 $rid = $rt->getArticleID();
 182                                                 if ( 0 != $rid ) {
 183                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 184                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 185                                                         $res = wfQuery( $sql, DB_READ, $fname );
 186
 187                                                         if ( 0 != wfNumRows( $res ) ) {
 188                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 189                                                                 $this->mTitle = $rt;
 190                                                                 $s = wfFetchObject( $res );
 191                                                         }
 192                                                 }
 193                                         }
 194                                 }
 195                         }
 196
 197                         $this->mContent = $s->cur_text;
 198                         $this->mUser = $s->cur_user;
 199                         $this->mCounter = $s->cur_counter;
 200                         $this->mTimestamp = $s->cur_timestamp;
 201                         $this->mTouched = $s->cur_touched;
 202                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 203                         $this->mTitle->mRestrictionsLoaded = true;
 204                         wfFreeResult( $res );
 205                 } else { # oldid set, retrieve historical version
 206                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 207                           "WHERE old_id={$oldid}";
 208                         $res = wfQuery( $sql, DB_READ, $fname );
 209                         if ( 0 == wfNumRows( $res ) ) { return; }
 210
 211                         $s = wfFetchObject( $res );
 212                         $this->mContent = Article::getRevisionText( $s );
 213                         $this->mUser = $s->old_user;
 214                         $this->mCounter = 0;
 215                         $this->mTimestamp = $s->old_timestamp;
 216                         wfFreeResult( $res );
 217                 }
 218                 $this->mContentLoaded = true;
 219                 return $this->mContent;
 220         }
 221
 222         # Gets the article text without using so many damn globals
 223         # Returns false on error
 224         function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
 225                 global $wgMwRedir;
 226
 227                 if ( $this->mContentLoaded ) {
 228                         return $this->mContent;
 229                 }
 230                 $this->mContent = false;
 231
 232                 $fname = "Article::loadContent";
 233
 234                 if ( ! $oldid ) {       # Retrieve current version
 235                         $id = $this->getID();
 236                         if ( 0 == $id ) {
 237                                 return false;
 238                         }
 239
 240                         $sql = "SELECT " .
 241                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 242                           "FROM cur WHERE cur_id={$id}";
 243                         $res = wfQuery( $sql, DB_READ, $fname );
 244                         if ( 0 == wfNumRows( $res ) ) {
 245                                 return false;
 246                         }
 247
 248                         $s = wfFetchObject( $res );
 249                         # If we got a redirect, follow it (unless we've been told
 250                         # not to by either the function parameter or the query
 251                         if ( !$noredir && $wgMwRedir->matchStart( $s->cur_text ) ) {
 252                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 253                                   $s->cur_text, $m ) ) {
 254                                         $rt = Title::newFromText( $m[1] );
 255                                         if( $rt &&  $rt->getInterwiki() == "" && $rt->getNamespace() != Namespace::getSpecial() ) {
 256                                                 $rid = $rt->getArticleID();
 257                                                 if ( 0 != $rid ) {
 258                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 259                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 260                                                         $res = wfQuery( $sql, DB_READ, $fname );
 261
 262                                                         if ( 0 != wfNumRows( $res ) ) {
 263                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 264                                                                 $this->mTitle = $rt;
 265                                                                 $s = wfFetchObject( $res );
 266                                                         }
 267                                                 }
 268                                         }
 269                                 }
 270                         }
 271
 272                         $this->mContent = $s->cur_text;
 273                         $this->mUser = $s->cur_user;
 274                         $this->mCounter = $s->cur_counter;
 275                         $this->mTimestamp = $s->cur_timestamp;
 276                         $this->mTouched = $s->cur_touched;
 277                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 278                         $this->mTitle->mRestrictionsLoaded = true;
 279                         wfFreeResult( $res );
 280                 } else { # oldid set, retrieve historical version
 281                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 282                           "WHERE old_id={$oldid}";
 283                         $res = wfQuery( $sql, DB_READ, $fname );
 284                         if ( 0 == wfNumRows( $res ) ) {
 285                                 return false;
 286                         }
 287
 288                         $s = wfFetchObject( $res );
 289                         $this->mContent = Article::getRevisionText( $s );
 290                         $this->mUser = $s->old_user;
 291                         $this->mCounter = 0;
 292                         $this->mTimestamp = $s->old_timestamp;
 293                         wfFreeResult( $res );
 294                 }
 295                 $this->mContentLoaded = true;
 296                 return $this->mContent;
 297         }
 298
 299         function getID() {
 300                 if( $this->mTitle ) {
 301                         return $this->mTitle->getArticleID();
 302                 } else {
 303                         return 0;
 304                 }
 305         }
 306
 307         function getCount()
 308         {
 309                 if ( -1 == $this->mCounter ) {
 310                         $id = $this->getID();
 311                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 312                 }
 313                 return $this->mCounter;
 314         }
 315
 316         # Would the given text make this article a "good" article (i.e.,
 317         # suitable for including in the article count)?
 318
 319         function isCountable( $text )
 320         {
 321                 global $wgUseCommaCount, $wgMwRedir;
 322
 323                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 324                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 325                 $token = ($wgUseCommaCount ? "," : "[[" );
 326                 if ( false === strstr( $text, $token ) ) { return 0; }
 327                 return 1;
 328         }
 329
 330         # Loads everything from cur except cur_text
 331         # This isn't necessary for all uses, so it's only done if needed.
 332
 333         /* private */ function loadLastEdit()
 334         {
 335                 global $wgOut;
 336                 if ( -1 != $this->mUser ) return;
 337
 338                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 339                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 340                   "cur_id=" . $this->getID();
 341                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 342
 343                 if ( wfNumRows( $res ) > 0 ) {
 344                         $s = wfFetchObject( $res );
 345                         $this->mUser = $s->cur_user;
 346                         $this->mUserText = $s->cur_user_text;
 347                         $this->mTimestamp = $s->cur_timestamp;
 348                         $this->mComment = $s->cur_comment;
 349                         $this->mMinorEdit = $s->cur_minor_edit;
 350                 }
 351         }
 352
 353         function getTimestamp()
 354         {
 355                 $this->loadLastEdit();
 356                 return $this->mTimestamp;
 357         }
 358
 359         function getUser()
 360         {
 361                 $this->loadLastEdit();
 362                 return $this->mUser;
 363         }
 364
 365         function getUserText()
 366         {
 367                 $this->loadLastEdit();
 368                 return $this->mUserText;
 369         }
 370
 371         function getComment()
 372         {
 373                 $this->loadLastEdit();
 374                 return $this->mComment;
 375         }
 376
 377         function getMinorEdit()
 378         {
 379                 $this->loadLastEdit();
 380                 return $this->mMinorEdit;
 381         }
 382
 383         function getContributors($limit = 0, $offset = 0)
 384         {
 385                 # XXX: this is expensive; cache this info somewhere.
 386
 387                 $title = $this->mTitle;
 388
 389                 $contribs = array();
 390
 391                 $res = wfQuery("SELECT DISTINCT old.old_user, old.old_user_text, user.user_real_name " .
 392                                " FROM old, user " .
 393                                " WHERE old.old_user = user.user_id " .
 394                                " AND old.old_namespace = " . $title->getNamespace() .
 395                                " AND old.old_title = '" . $title->getDBkey() . "'" .
 396                                " AND old.old_user != 0 " .
 397                                " AND old.old_user != " . $this->getUser(), DB_READ);
 398
 399                 while ( $line = wfFetchObject( $res ) ) {
 400                         $contribs[$line->old_user] = array($line->old_user_text, $line->user_real_name);
 401                 }
 402
 403                 # Count anonymous users
 404
 405                 $res = wfQuery("SELECT COUNT(*) AS cnt " .
 406                                " FROM old " .
 407                                " WHERE old_namespace = " . $title->getNamespace() .
 408                                " AND old_title = '" . $title->getDBkey() . "'" .
 409                                " AND old_user = 0 ", DB_READ);
 410
 411                 while ( $line = wfFetchObject( $res ) ) {
 412                         $contribs[0] = array($line->cnt, 'Anonymous');
 413                 }
 414
 415                 return $contribs;
 416         }
 417
 418         # This is the default action of the script: just view the page of
 419         # the given title.
 420
 421         function view()
 422         {
 423                 global $wgUser, $wgOut, $wgLang, $wgRequest;
 424                 global $wgLinkCache, $IP, $wgEnableParserCache;
 425
 426                 $fname = "Article::view";
 427                 wfProfileIn( $fname );
 428
 429                 # Get variables from query string :P
 430                 $oldid = $wgRequest->getVal( 'oldid' );
 431                 $diff = $wgRequest->getVal( 'diff' );
 432
 433                 $wgOut->setArticleFlag( true );
 434                 $wgOut->setRobotpolicy( "index,follow" );
 435
 436                 # If we got diff and oldid in the query, we want to see a
 437                 # diff page instead of the article.
 438
 439                 if ( !is_null( $diff ) ) {
 440                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 441                         $de = new DifferenceEngine( intval($oldid), intval($diff) );
 442                         $de->showDiffPage();
 443                         wfProfileOut( $fname );
 444                         return;
 445                 }
 446
 447                 if ( !is_null( $oldid ) and $this->checkTouched() ) {
 448                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 449                                 return;
 450                         } else if ( $this->tryFileCache() ) {
 451                                 # tell wgOut that output is taken care of
 452                                 $wgOut->disable();
 453                                 $this->viewUpdates();
 454                                 return;
 455                         }
 456                 }
 457
 458                 $text = $this->getContent(); # May change mTitle
 459                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 460                 $wgOut->setHTMLTitle( $this->mTitle->getPrefixedText() .
 461                   " - " . wfMsg( "wikititlesuffix" ) );
 462
 463                 # We're looking at an old revision
 464
 465                 if ( !empty( $oldid ) ) {
 466                         $this->setOldSubtitle();
 467                         $wgOut->setRobotpolicy( "noindex,follow" );
 468                 }
 469                 if ( "" != $this->mRedirectedFrom ) {
 470                         $sk = $wgUser->getSkin();
 471                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 472                           "redirect=no" );
 473                         $s = wfMsg( "redirectedfrom", $redir );
 474                         $wgOut->setSubtitle( $s );
 475                 }
 476
 477                 $wgLinkCache->preFill( $this->mTitle );
 478
 479                 if( $wgEnableParserCache && intval($wgUser->getOption( "stubthreshold" )) == 0 ){
 480                         $wgOut->addWikiText( $text, true, $this );
 481                 } else {
 482                         $wgOut->addWikiText( $text );
 483                 }
 484
 485                 # Add link titles as META keywords
 486                 $wgOut->addMetaTags() ;
 487
 488                 $this->viewUpdates();
 489                 wfProfileOut( $fname );
 490         }
 491
 492         # Theoretically we could defer these whole insert and update
 493         # functions for after display, but that's taking a big leap
 494         # of faith, and we want to be able to report database
 495         # errors at some point.
 496
 497         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 498         {
 499                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 500                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 501
 502                 $fname = "Article::insertNewArticle";
 503
 504                 $this->mCountAdjustment = $this->isCountable( $text );
 505
 506                 $ns = $this->mTitle->getNamespace();
 507                 $ttl = $this->mTitle->getDBkey();
 508                 $text = $this->preSaveTransform( $text );
 509                 if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
 510                 else { $redir = 0; }
 511
 512                 $now = wfTimestampNow();
 513                 $won = wfInvertTimestamp( $now );
 514                 wfSeedRandom();
 515                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, ".", "" );
 516                 $isminor = ( $isminor && $wgUser->getID() ) ? 1 : 0;
 517                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 518                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 519                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 520                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 521                   wfStrencode( $text ) . "', '" .
 522                   wfStrencode( $summary ) . "', '" .
 523                   $wgUser->getID() . "', '{$now}', " .
 524                   $isminor . ", 0, '', '" .
 525                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 526                 $res = wfQuery( $sql, DB_WRITE, $fname );
 527
 528                 $newid = wfInsertId();
 529                 $this->mTitle->resetArticleID( $newid );
 530
 531                 Article::onArticleCreate( $this->mTitle );
 532                 RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );
 533
 534                 if ($watchthis) {
 535                         if(!$this->mTitle->userIsWatching()) $this->watch();
 536                 } else {
 537                         if ( $this->mTitle->userIsWatching() ) {
 538                                 $this->unwatch();
 539                         }
 540                 }
 541
 542                 # The talk page isn't in the regular link tables, so we need to update manually:
 543                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 544                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 545                 wfQuery( $sql, DB_WRITE );
 546
 547                 # standard deferred updates
 548                 $this->editUpdates( $text );
 549
 550                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 551         }
 552
 553
 554         /* Side effects: loads last edit */
 555         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = ""){
 556                 $this->loadLastEdit();
 557                 $oldtext = $this->getContent();
 558                 if ($section != "") {
 559                         if($section=="new") {
 560                                 if($summary) $subject="== {$summary} ==\n\n";
 561                                 $text=$oldtext."\n\n".$subject.$text;
 562                         } else {
 563                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?>.*?<\/h[1-6].*?>)/mi",
 564                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 565                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 566                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 567                                 $text=join("",$secs);
 568                         }
 569                 }
 570                 return $text;
 571         }
 572
 573         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false )
 574         {
 575                 global $wgOut, $wgUser, $wgLinkCache;
 576                 global $wgDBtransactions, $wgMwRedir;
 577                 global $wgUseSquid, $wgInternalServer;
 578                 $fname = "Article::updateArticle";
 579
 580                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 581                 if ( $minor && $wgUser->getID() ) { $me2 = 1; } else { $me2 = 0; }
 582                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 583                         $redir = 1;
 584                         $text = $m[1] . "\n"; # Remove all content but redirect
 585                 }
 586                 else { $redir = 0; }
 587
 588                 $text = $this->preSaveTransform( $text );
 589
 590                 # Update article, but only if changed.
 591
 592                 if( $wgDBtransactions ) {
 593                         $sql = "BEGIN";
 594                         wfQuery( $sql, DB_WRITE );
 595                 }
 596                 $oldtext = $this->getContent( true );
 597
 598                 if ( 0 != strcmp( $text, $oldtext ) ) {
 599                         $this->mCountAdjustment = $this->isCountable( $text )
 600                           - $this->isCountable( $oldtext );
 601
 602                         $now = wfTimestampNow();
 603                         $won = wfInvertTimestamp( $now );
 604                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 605                           "',cur_comment='" .  wfStrencode( $summary ) .
 606                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 607                           ",cur_timestamp='{$now}',cur_user_text='" .
 608                           wfStrencode( $wgUser->getName() ) .
 609                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 610                           "WHERE cur_id=" . $this->getID() .
 611                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 612                         $res = wfQuery( $sql, DB_WRITE, $fname );
 613
 614                         if( wfAffectedRows() == 0 ) {
 615                                 /* Belated edit conflict! Run away!! */
 616                                 return false;
 617                         }
 618
 619                         # This overwrites $oldtext if revision compression is on
 620                         $flags = Article::compressRevisionText( $oldtext );
 621
 622                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 623                           "old_comment,old_user,old_user_text,old_timestamp," .
 624                           "old_minor_edit,inverse_timestamp,old_flags) VALUES (" .
 625                           $this->mTitle->getNamespace() . ", '" .
 626                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 627                           wfStrencode( $oldtext ) . "', '" .
 628                           wfStrencode( $this->getComment() ) . "', " .
 629                           $this->getUser() . ", '" .
 630                           wfStrencode( $this->getUserText() ) . "', '" .
 631                           $this->getTimestamp() . "', " . $me1 . ", '" .
 632                           wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
 633                         $res = wfQuery( $sql, DB_WRITE, $fname );
 634                         $oldid = wfInsertID( $res );
 635
 636                         $bot = (int)($wgUser->isBot() || $forceBot);
 637                         RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $summary,
 638                                 $oldid, $this->getTimestamp(), $bot );
 639                         Article::onArticleEdit( $this->mTitle );
 640                 }
 641
 642                 if( $wgDBtransactions ) {
 643                         $sql = "COMMIT";
 644                         wfQuery( $sql, DB_WRITE );
 645                 }
 646
 647                 if ($watchthis) {
 648                         if (!$this->mTitle->userIsWatching()) $this->watch();
 649                 } else {
 650                         if ( $this->mTitle->userIsWatching() ) {
 651                                 $this->unwatch();
 652                         }
 653                 }
 654                 # standard deferred updates
 655                 $this->editUpdates( $text );
 656
 657
 658                 $urls = array();
 659                 # Template namespace
 660                 # Purge all articles linking here
 661                 if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
 662                         $titles = $this->mTitle->getLinksTo();
 663                         Title::touchArray( $titles );
 664                         if ( $wgUseSquid ) {
 665                                 foreach ( $titles as $title ) {
 666                                         $urls[] = $title->getInternalURL();
 667                                 }
 668                         }
 669                 }
 670
 671                 # Squid updates
 672                 if ( $wgUseSquid ) {
 673                         $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
 674                         $u = new SquidUpdate( $urls );
 675                         $u->doUpdate();
 676                 }
 677
 678                 $this->showArticle( $text, wfMsg( "updated" ) );
 679                 return true;
 680         }
 681
 682         # After we've either updated or inserted the article, update
 683         # the link tables and redirect to the new page.
 684
 685         function showArticle( $text, $subtitle )
 686         {
 687                 global $wgOut, $wgUser, $wgLinkCache;
 688                 global $wgMwRedir;
 689
 690                 $wgLinkCache = new LinkCache();
 691
 692                 # Get old version of link table to allow incremental link updates
 693                 $wgLinkCache->preFill( $this->mTitle );
 694                 $wgLinkCache->clear();
 695
 696                 # Now update the link cache by parsing the text
 697                 $wgOut = new OutputPage();
 698                 $wgOut->addWikiText( $text );
 699
 700                 if( $wgMwRedir->matchStart( $text ) )
 701                         $r = "redirect=no";
 702                 else
 703                         $r = "";
 704                 $wgOut->redirect( $this->mTitle->getFullURL( $r ) );
 705         }
 706
 707         # Add this page to my watchlist
 708
 709         function watch( $add = true )
 710         {
 711                 global $wgUser, $wgOut, $wgLang;
 712                 global $wgDeferredUpdateList;
 713
 714                 if ( 0 == $wgUser->getID() ) {
 715                         $wgOut->errorpage( "watchnologin", "watchnologintext" );
 716                         return;
 717                 }
 718                 if ( wfReadOnly() ) {
 719                         $wgOut->readOnlyPage();
 720                         return;
 721                 }
 722                 if( $add )
 723                         $wgUser->addWatch( $this->mTitle );
 724                 else
 725                         $wgUser->removeWatch( $this->mTitle );
 726
 727                 $wgOut->setPagetitle( wfMsg( $add ? "addedwatch" : "removedwatch" ) );
 728                 $wgOut->setRobotpolicy( "noindex,follow" );
 729
 730                 $sk = $wgUser->getSkin() ;
 731                 $link = $this->mTitle->getPrefixedText();
 732
 733                 if($add)
 734                         $text = wfMsg( "addedwatchtext", $link );
 735                 else
 736                         $text = wfMsg( "removedwatchtext", $link );
 737                 $wgOut->addWikiText( $text );
 738
 739                 $up = new UserUpdate();
 740                 array_push( $wgDeferredUpdateList, $up );
 741
 742                 $wgOut->returnToMain( false );
 743         }
 744
 745         function unwatch()
 746         {
 747                 $this->watch( false );
 748         }
 749
 750         function protect( $limit = "sysop" )
 751         {
 752                 global $wgUser, $wgOut, $wgRequest;
 753
 754                 if ( ! $wgUser->isSysop() ) {
 755                         $wgOut->sysopRequired();
 756                         return;
 757                 }
 758                 if ( wfReadOnly() ) {
 759                         $wgOut->readOnlyPage();
 760                         return;
 761                 }
 762                 $id = $this->mTitle->getArticleID();
 763                 if ( 0 == $id ) {
 764                         $wgOut->fatalEror( wfMsg( "badarticleerror" ) );
 765                         return;
 766                 }
 767
 768                 $confirm = $wgRequest->getBool( 'wpConfirmProtect' ) && $wgRequest->wasPosted();
 769                 $reason = $wgRequest->getText( 'wpReasonProtect' );
 770
 771                 if ( $confirm ) {
 772
 773         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 774                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 775                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 776
 777                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 778                 if ( $limit === "" ) {
 779                                 $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), $reason );
 780                 } else {
 781                                 $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), $reason );
 782                 }
 783                 $wgOut->redirect( $this->mTitle->getFullURL() );
 784                         return;
 785                 } else {
 786                         $reason = htmlspecialchars( wfMsg( "protectreason" ) );
 787                         return $this->confirmProtect( "", $reason, $limit );
 788                 }
 789         }
 790
 791                 # Output protection confirmation dialog
 792         function confirmProtect( $par, $reason, $limit = "sysop"  )
 793         {
 794                 global $wgOut;
 795
 796                 wfDebug( "Article::confirmProtect\n" );
 797
 798                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 799                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 800
 801                 $check = "";
 802                 $protcom = "";
 803
 804                 if ( $limit === "" ) {
 805                         $wgOut->setSubtitle( wfMsg( "unprotectsub", $sub ) );
 806                         $wgOut->addWikiText( wfMsg( "confirmunprotecttext" ) );
 807                         $check = htmlspecialchars( wfMsg( "confirmunprotect" ) );
 808                         $protcom = htmlspecialchars( wfMsg( "unprotectcomment" ) );
 809                         $formaction = $this->mTitle->escapeLocalURL( "action=unprotect" . $par );
 810                 } else {
 811                         $wgOut->setSubtitle( wfMsg( "protectsub", $sub ) );
 812                         $wgOut->addWikiText( wfMsg( "confirmprotecttext" ) );
 813                         $check = htmlspecialchars( wfMsg( "confirmprotect" ) );
 814                         $protcom = htmlspecialchars( wfMsg( "protectcomment" ) );
 815                         $formaction = $this->mTitle->escapeLocalURL( "action=protect" . $par );
 816                 }
 817
 818                 $confirm = htmlspecialchars( wfMsg( "confirm" ) );
 819
 820                 $wgOut->addHTML( "
 821 <form id='protectconfirm' method='post' action=\"{$formaction}\">
 822         <table border='0'>
 823                 <tr>
 824                         <td align='right'>
 825                                 <label for='wpReasonProtect'>{$protcom}:</label>
 826                         </td>
 827                         <td align='left'>
 828                                 <input type='text' size='60' name='wpReasonProtect' id='wpReasonProtect' value=\"" . htmlspecialchars( $reason ) . "\" />
 829                         </td>
 830                 </tr>
 831                 <tr>
 832                         <td>&nbsp;</td>
 833                 </tr>
 834                 <tr>
 835                         <td align='right'>
 836                                 <input type='checkbox' name='wpConfirmProtect' value='1' id='wpConfirmProtect' />
 837                         </td>
 838                         <td>
 839                                 <label for='wpConfirmProtect'>{$check}</label>
 840                         </td>
 841                 </tr>
 842                 <tr>
 843                         <td>&nbsp;</td>
 844                         <td>
 845                                 <input type='submit' name='wpConfirmProtectB' value=\"{$confirm}\" />
 846                         </td>
 847                 </tr>
 848         </table>
 849 </form>\n" );
 850
 851                 $wgOut->returnToMain( false );
 852         }
 853
 854         function unprotect()
 855         {
 856                 return $this->protect( "" );
 857         }
 858
 859         # UI entry point for page deletion
 860         function delete()
 861         {
 862                 global $wgUser, $wgOut, $wgMessageCache, $wgRequest;
 863                 $fname = "Article::delete";
 864                 $confirm = $wgRequest->getBool( 'wpConfirm' ) && $wgRequest->wasPosted();
 865                 $reason = $wgRequest->getText( 'wpReason' );
 866
 867                 # This code desperately needs to be totally rewritten
 868
 869                 # Check permissions
 870                 if ( ( ! $wgUser->isSysop() ) ) {
 871                         $wgOut->sysopRequired();
 872                         return;
 873                 }
 874                 if ( wfReadOnly() ) {
 875                         $wgOut->readOnlyPage();
 876                         return;
 877                 }
 878
 879                 # Better double-check that it hasn't been deleted yet!
 880                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 881                 if ( ( "" == trim( $this->mTitle->getText() ) )
 882                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 883                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 884                         return;
 885                 }
 886
 887                 if ( $confirm ) {
 888                         $this->doDelete( $reason );
 889                         return;
 890                 }
 891
 892                 # determine whether this page has earlier revisions
 893                 # and insert a warning if it does
 894                 # we select the text because it might be useful below
 895                 $ns = $this->mTitle->getNamespace();
 896                 $title = $this->mTitle->getDBkey();
 897                 $etitle = wfStrencode( $title );
 898                 $sql = "SELECT old_text,old_flags FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 899                 $res = wfQuery( $sql, DB_READ, $fname );
 900                 if( ($old=wfFetchObject($res)) && !$confirm ) {
 901                         $skin=$wgUser->getSkin();
 902                         $wgOut->addHTML("<b>".wfMsg("historywarning"));
 903                         $wgOut->addHTML( $skin->historyLink() ."</b>");
 904                 }
 905
 906                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 907                 $res=wfQuery($sql, DB_READ, $fname);
 908                 if( ($s=wfFetchObject($res))) {
 909
 910                         # if this is a mini-text, we can paste part of it into the deletion reason
 911
 912                         #if this is empty, an earlier revision may contain "useful" text
 913                         $blanked = false;
 914                         if($s->cur_text!="") {
 915                                 $text=$s->cur_text;
 916                         } else {
 917                                 if($old) {
 918                                         $text = Article::getRevisionText( $old );
 919                                         $blanked = true;
 920                                 }
 921
 922                         }
 923
 924                         $length=strlen($text);
 925
 926                         # this should not happen, since it is not possible to store an empty, new
 927                         # page. Let's insert a standard text in case it does, though
 928                         if($length == 0 && $reason === "") {
 929                                 $reason = wfMsg("exblank");
 930                         }
 931
 932                         if($length < 500 && $reason === "") {
 933
 934                                 # comment field=255, let's grep the first 150 to have some user
 935                                 # space left
 936                                 $text=substr($text,0,150);
 937                                 # let's strip out newlines and HTML tags
 938                                 $text=preg_replace("/\"/","'",$text);
 939                                 $text=preg_replace("/\</","&lt;",$text);
 940                                 $text=preg_replace("/\>/","&gt;",$text);
 941                                 $text=preg_replace("/[\n\r]/","",$text);
 942                                 if(!$blanked) {
 943                                         $reason=wfMsg("excontent"). " '".$text;
 944                                 } else {
 945                                         $reason=wfMsg("exbeforeblank") . " '".$text;
 946                                 }
 947                                 if($length>150) { $reason .= "..."; } # we've only pasted part of the text
 948                                 $reason.="'";
 949                         }
 950                 }
 951
 952                 return $this->confirmDelete( "", $reason );
 953         }
 954
 955         # Output deletion confirmation dialog
 956         function confirmDelete( $par, $reason )
 957         {
 958                 global $wgOut;
 959
 960                 wfDebug( "Article::confirmDelete\n" );
 961
 962                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 963                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
 964                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 965                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
 966
 967                 $formaction = $this->mTitle->escapeLocalURL( "action=delete" . $par );
 968
 969                 $confirm = htmlspecialchars( wfMsg( "confirm" ) );
 970                 $check = htmlspecialchars( wfMsg( "confirmcheck" ) );
 971                 $delcom = htmlspecialchars( wfMsg( "deletecomment" ) );
 972
 973                 $wgOut->addHTML( "
 974 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
 975         <table border='0'>
 976                 <tr>
 977                         <td align='right'>
 978                                 <label for='wpReason'>{$delcom}:</label>
 979                         </td>
 980                         <td align='left'>
 981                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
 982                         </td>
 983                 </tr>
 984                 <tr>
 985                         <td>&nbsp;</td>
 986                 </tr>
 987                 <tr>
 988                         <td align='right'>
 989                                 <input type='checkbox' name='wpConfirm' value='1' id='wpConfirm' />
 990                         </td>
 991                         <td>
 992                                 <label for='wpConfirm'>{$check}</label>
 993                         </td>
 994                 </tr>
 995                 <tr>
 996                         <td>&nbsp;</td>
 997                         <td>
 998                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
 999                         </td>
1000                 </tr>
1001         </table>
1002 </form>\n" );
1003
1004                 $wgOut->returnToMain( false );
1005         }
1006
1007         # Perform a deletion and output success or failure messages
1008         function doDelete( $reason )
1009         {
1010                 global $wgOut, $wgUser, $wgLang;
1011                 $fname = "Article::doDelete";
1012                 wfDebug( "$fname\n" );
1013
1014                 if ( $this->doDeleteArticle( $reason ) ) {
1015                         $deleted = $this->mTitle->getPrefixedText();
1016
1017                         $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1018                         $wgOut->setRobotpolicy( "noindex,nofollow" );
1019
1020                         $sk = $wgUser->getSkin();
1021                         $loglink = $sk->makeKnownLink( $wgLang->getNsText(
1022                           Namespace::getWikipedia() ) .
1023                           ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
1024
1025                         $text = wfMsg( "deletedtext", $deleted, $loglink );
1026
1027                         $wgOut->addHTML( "<p>" . $text . "</p>\n" );
1028                         $wgOut->returnToMain( false );
1029                 } else {
1030                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
1031                 }
1032         }
1033
1034         # Back-end article deletion
1035         # Deletes the article with database consistency, writes logs, purges caches
1036         # Returns success
1037         function doDeleteArticle( $reason )
1038         {
1039                 global $wgUser, $wgLang;
1040                 global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
1041
1042                 $fname = "Article::doDeleteArticle";
1043                 wfDebug( "$fname\n" );
1044
1045                 $ns = $this->mTitle->getNamespace();
1046                 $t = wfStrencode( $this->mTitle->getDBkey() );
1047                 $id = $this->mTitle->getArticleID();
1048
1049                 if ( "" == $t || $id == 0 ) {
1050                         return false;
1051                 }
1052
1053                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
1054                 array_push( $wgDeferredUpdateList, $u );
1055
1056                 $linksTo = $this->mTitle->getLinksTo();
1057
1058                 # Squid purging
1059                 if ( $wgUseSquid ) {
1060                         $urls = array(
1061                                 $this->mTitle->getInternalURL(),
1062                                 $this->mTitle->getInternalURL( "history" )
1063                         );
1064                         foreach ( $linksTo as $linkTo ) {
1065                                 $urls[] = $linkTo->getInternalURL();
1066                         }
1067
1068                         $u = new SquidUpdate( $urls );
1069                         array_push( $wgDeferredUpdateList, $u );
1070
1071                 }
1072
1073                 # Client and file cache invalidation
1074                 Title::touchArray( $linksTo );
1075
1076                 # Move article and history to the "archive" table
1077                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
1078                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
1079                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
1080                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
1081                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
1082                 wfQuery( $sql, DB_WRITE, $fname );
1083
1084                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
1085                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
1086                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
1087                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
1088                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
1089                 wfQuery( $sql, DB_WRITE, $fname );
1090
1091                 # Now that it's safely backed up, delete it
1092
1093                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
1094                   "cur_title='{$t}'";
1095                 wfQuery( $sql, DB_WRITE, $fname );
1096
1097                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
1098                   "old_title='{$t}'";
1099                 wfQuery( $sql, DB_WRITE, $fname );
1100
1101                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
1102                   "rc_title='{$t}'";
1103                 wfQuery( $sql, DB_WRITE, $fname );
1104
1105                 # Finally, clean up the link tables
1106                 $t = wfStrencode( $this->mTitle->getPrefixedDBkey() );
1107
1108                 Article::onArticleDelete( $this->mTitle );
1109
1110                 $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
1111                 $first = true;
1112
1113                 foreach ( $linksTo as $titleObj ) {
1114                         if ( ! $first ) { $sql .= ","; }
1115                         $first = false;
1116                         # Get article ID. Efficient because it was loaded into the cache by getLinksTo().
1117                         $linkID = $titleObj->getArticleID();
1118                         $sql .= "({$linkID},'{$t}')";
1119                 }
1120                 if ( ! $first ) {
1121                         wfQuery( $sql, DB_WRITE, $fname );
1122                 }
1123
1124                 $sql = "DELETE FROM links WHERE l_to={$id}";
1125                 wfQuery( $sql, DB_WRITE, $fname );
1126
1127                 $sql = "DELETE FROM links WHERE l_from={$id}";
1128                 wfQuery( $sql, DB_WRITE, $fname );
1129
1130                 $sql = "DELETE FROM imagelinks WHERE il_from={$id}";
1131                 wfQuery( $sql, DB_WRITE, $fname );
1132
1133                 $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
1134                 wfQuery( $sql, DB_WRITE, $fname );
1135
1136                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
1137                 $art = $this->mTitle->getPrefixedText();
1138                 $log->addEntry( wfMsg( "deletedarticle", $art ), $reason );
1139
1140                 # Clear the cached article id so the interface doesn't act like we exist
1141                 $this->mTitle->resetArticleID( 0 );
1142                 $this->mTitle->mArticleID = 0;
1143                 return true;
1144         }
1145
1146         function rollback()
1147         {
1148                 global $wgUser, $wgLang, $wgOut, $wgRequest;
1149
1150                 if ( ! $wgUser->isSysop() ) {
1151                         $wgOut->sysopRequired();
1152                         return;
1153                 }
1154                 if ( wfReadOnly() ) {
1155                         $wgOut->readOnlyPage( $this->getContent() );
1156                         return;
1157                 }
1158
1159                 # Enhanced rollback, marks edits rc_bot=1
1160                 $bot = $wgRequest->getBool( 'bot' );
1161
1162                 # Replace all this user's current edits with the next one down
1163                 $tt = wfStrencode( $this->mTitle->getDBKey() );
1164                 $n = $this->mTitle->getNamespace();
1165
1166                 # Get the last editor
1167                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
1168                 $res = wfQuery( $sql, DB_READ );
1169                 if( ($x = wfNumRows( $res )) != 1 ) {
1170                         # Something wrong
1171                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
1172                         return;
1173                 }
1174                 $s = wfFetchObject( $res );
1175                 $ut = wfStrencode( $s->cur_user_text );
1176                 $uid = $s->cur_user;
1177                 $pid = $s->cur_id;
1178
1179                 $from = str_replace( '_', ' ', $wgRequest->getVal( "from" ) );
1180                 if( $from != $s->cur_user_text ) {
1181                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
1182                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
1183                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
1184                                 htmlspecialchars( $from ),
1185                                 htmlspecialchars( $s->cur_user_text ) ) );
1186                         if($s->cur_comment != "") {
1187                                 $wgOut->addHTML(
1188                                         wfMsg("editcomment",
1189                                         htmlspecialchars( $s->cur_comment ) ) );
1190                         }
1191                         return;
1192                 }
1193
1194                 # Get the last edit not by this guy
1195                 $sql = "SELECT old_text,old_user,old_user_text,old_timestamp,old_flags
1196                 FROM old USE INDEX (name_title_timestamp)
1197                 WHERE old_namespace={$n} AND old_title='{$tt}'
1198                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
1199                 ORDER BY inverse_timestamp LIMIT 1";
1200                 $res = wfQuery( $sql, DB_READ );
1201                 if( wfNumRows( $res ) != 1 ) {
1202                         # Something wrong
1203                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
1204                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
1205                         return;
1206                 }
1207                 $s = wfFetchObject( $res );
1208
1209                 if ( $bot ) {
1210                         # Mark all reverted edits as bot
1211                         $sql = "UPDATE recentchanges SET rc_bot=1 WHERE
1212                                 rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
1213                         wfQuery( $sql, DB_WRITE, $fname );
1214                 }
1215
1216                 # Save it!
1217                 $newcomment = wfMsg( "revertpage", $s->old_user_text, $from );
1218                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1219                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1220                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr />\n" );
1221                 $this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
1222                 Article::onArticleEdit( $this->mTitle );
1223                 $wgOut->returnToMain( false );
1224         }
1225
1226
1227         # Do standard deferred updates after page view
1228
1229         /* private */ function viewUpdates()
1230         {
1231                 global $wgDeferredUpdateList;
1232                 if ( 0 != $this->getID() ) {
1233                         global $wgDisableCounters;
1234                         if( !$wgDisableCounters ) {
1235                                 Article::incViewCount( $this->getID() );
1236                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1237                                 array_push( $wgDeferredUpdateList, $u );
1238                         }
1239                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
1240                           $this->mTitle->getDBkey() );
1241                         array_push( $wgDeferredUpdateList, $u );
1242                 }
1243         }
1244
1245         # Do standard deferred updates after page edit.
1246         # Every 1000th edit, prune the recent changes table.
1247
1248         /* private */ function editUpdates( $text )
1249         {
1250                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
1251                 global $wgMessageCache;
1252
1253                 wfSeedRandom();
1254                 if ( 0 == mt_rand( 0, 999 ) ) {
1255                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1256                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1257                         wfQuery( $sql, DB_WRITE );
1258                 }
1259                 $id = $this->getID();
1260                 $title = $this->mTitle->getPrefixedDBkey();
1261                 $shortTitle = $this->mTitle->getDBkey();
1262
1263                 $adj = $this->mCountAdjustment;
1264
1265                 if ( 0 != $id ) {
1266                         $u = new LinksUpdate( $id, $title );
1267                         array_push( $wgDeferredUpdateList, $u );
1268                         $u = new SiteStatsUpdate( 0, 1, $adj );
1269                         array_push( $wgDeferredUpdateList, $u );
1270                         $u = new SearchUpdate( $id, $title, $text );
1271                         array_push( $wgDeferredUpdateList, $u );
1272
1273                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
1274                         array_push( $wgDeferredUpdateList, $u );
1275
1276                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1277                                 $wgMessageCache->replace( $shortTitle, $text );
1278                         }
1279                 }
1280         }
1281
1282         /* private */ function setOldSubtitle()
1283         {
1284                 global $wgLang, $wgOut;
1285
1286                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1287                 $r = wfMsg( "revisionasof", $td );
1288                 $wgOut->setSubtitle( "({$r})" );
1289         }
1290
1291         # This function is called right before saving the wikitext,
1292         # so we can do things like signatures and links-in-context.
1293
1294         function preSaveTransform( $text )
1295         {
1296                 global $wgParser, $wgUser;
1297                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
1298         }
1299
1300         /* Caching functions */
1301
1302         # checkLastModified returns true if it has taken care of all
1303         # output to the client that is necessary for this request.
1304         # (that is, it has sent a cached version of the page)
1305         function tryFileCache() {
1306                 static $called = false;
1307                 if( $called ) {
1308                         wfDebug( " tryFileCache() -- called twice!?\n" );
1309                         return;
1310                 }
1311                 $called = true;
1312                 if($this->isFileCacheable()) {
1313                         $touched = $this->mTouched;
1314                         if( $this->mTitle->getPrefixedDBkey() == wfMsg( "mainpage" ) ) {
1315                                 # Expire the main page quicker
1316                                 $expire = wfUnix2Timestamp( time() - 3600 );
1317                                 $touched = max( $expire, $touched );
1318                         }
1319                         $cache = new CacheManager( $this->mTitle );
1320                         if($cache->isFileCacheGood( $touched )) {
1321                                 global $wgOut;
1322                                 wfDebug( " tryFileCache() - about to load\n" );
1323                                 $cache->loadFromFileCache();
1324                                 return true;
1325                         } else {
1326                                 wfDebug( " tryFileCache() - starting buffer\n" );
1327                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1328                         }
1329                 } else {
1330                         wfDebug( " tryFileCache() - not cacheable\n" );
1331                 }
1332         }
1333
1334         function isFileCacheable() {
1335                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
1336                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
1337
1338                 return $wgUseFileCache
1339                         and (!$wgShowIPinHeader)
1340                         and ($this->getID() != 0)
1341                         and ($wgUser->getId() == 0)
1342                         and (!$wgUser->getNewtalk())
1343                         and ($this->mTitle->getNamespace() != Namespace::getSpecial())
1344                         and ($action == "view")
1345                         and (!isset($oldid))
1346                         and (!isset($diff))
1347                         and (!isset($redirect))
1348                         and (!isset($printable))
1349                         and (!$this->mRedirectedFrom);
1350         }
1351
1352         function checkTouched() {
1353                 $id = $this->getID();
1354                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1355                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1356                 if( $s = wfFetchObject( $res ) ) {
1357                         $this->mTouched = $s->cur_touched;
1358                         return !$s->cur_is_redirect;
1359                 } else {
1360                         return false;
1361                 }
1362         }
1363
1364         /* static */ function incViewCount( $id )
1365         {
1366                 $id = intval( $id );
1367                 global $wgHitcounterUpdateFreq;
1368
1369                 if( $wgHitcounterUpdateFreq <= 1 ){ //
1370                         wfQuery("UPDATE cur SET cur_counter = cur_counter + 1 " .
1371                                 "WHERE cur_id = $id", DB_WRITE);
1372                         return;
1373                 }
1374
1375                 # Not important enough to warrant an error page in case of failure
1376                 $oldignore = wfIgnoreSQLErrors( true );
1377
1378                 wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);
1379
1380                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
1381                 if( (rand() % $checkfreq != 0) or (wfLastErrno() != 0) ){
1382                         # Most of the time (or on SQL errors), skip row count check
1383                         wfIgnoreSQLErrors( $oldignore );
1384                         return;
1385                 }
1386
1387                 $res = wfQuery("SELECT COUNT(*) as n FROM hitcounter", DB_WRITE);
1388                 $row = wfFetchObject( $res );
1389                 $rown = intval( $row->n );
1390                 if( $rown >= $wgHitcounterUpdateFreq ){
1391                         wfProfileIn( "Article::incViewCount-collect" );
1392                         $old_user_abort = ignore_user_abort( true );
1393
1394                         wfQuery("LOCK TABLES hitcounter WRITE", DB_WRITE);
1395                         wfQuery("CREATE TEMPORARY TABLE acchits TYPE=HEAP ".
1396                                 "SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter ".
1397                                 "GROUP BY hc_id", DB_WRITE);
1398                         wfQuery("DELETE FROM hitcounter", DB_WRITE);
1399                         wfQuery("UNLOCK TABLES", DB_WRITE);
1400                         wfQuery("UPDATE cur,acchits SET cur_counter=cur_counter + hc_n ".
1401                                 "WHERE cur_id = hc_id", DB_WRITE);
1402                         wfQuery("DROP TABLE acchits", DB_WRITE);
1403
1404                         ignore_user_abort( $old_user_abort );
1405                         wfProfileOut( "Article::incViewCount-collect" );
1406                 }
1407                 wfIgnoreSQLErrors( $oldignore );
1408         }
1409
1410         # The onArticle*() functions are supposed to be a kind of hooks
1411         # which should be called whenever any of the specified actions
1412         # are done.
1413         #
1414         # This is a good place to put code to clear caches, for instance.
1415
1416         # This is called on page move and undelete, as well as edit
1417         /* static */ function onArticleCreate($title_obj){
1418                 global $wgEnablePersistentLC, $wgEnableParserCache, $wgUseSquid, $wgDeferredUpdateList;
1419
1420                 $titles = $title_obj->getBrokenLinksTo();
1421
1422                 # Purge squid
1423                 if ( $wgUseSquid ) {
1424                         $urls = $title_obj->getSquidURLs();
1425                         foreach ( $titles as $linkTitle ) {
1426                                 $urls[] = $linkTitle->getInternalURL();
1427                         }
1428                         $u = new SquidUpdate( $urls );
1429                         array_push( $wgDeferredUpdateList, $u );
1430                 }
1431
1432                 # Clear persistent link cache
1433                 if ( $wgEnablePersistentLC ) {
1434                         LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1435                 }
1436
1437                 # Clear parser cache (not really used)
1438                 if ( $wgEnableParserCache ) {
1439                         OutputPage::parsercacheClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1440                 }
1441         }
1442
1443         /* static */ function onArticleDelete($title_obj){
1444                 global $wgEnablePersistentLC, $wgEnableParserCache;
1445                 if ( $wgEnablePersistentLC ) {
1446                         LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
1447                 }
1448                 if ( $wgEnableParserCache ) {
1449                         OutputPage::parsercacheClearLinksTo( $title_obj->getArticleID() );
1450                 }
1451         }
1452
1453         /* static */ function onArticleEdit($title_obj){
1454                 global $wgEnablePersistentLC, $wgEnableParserCache;
1455                 if ( $wgEnablePersistentLC ) {
1456                         LinkCache::linksccClearPage( $title_obj->getArticleID() );
1457                 }
1458                 if ( $wgEnableParserCache ) {
1459                         OutputPage::parsercacheClearPage( $title_obj->getArticleID(), $title_obj->getNamespace() );
1460                 }
1461         }
1462 }
1463
1464 ?>