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 )
  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                                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 104                                                 # comments to be stripped as well)
 105                                                 $striparray=array();
 106                                                 $parser=new Parser();
 107                                                 $parser->mOutputType=OT_WIKI;
 108                                                 $striptext=$parser->strip($this->mContent, $striparray, true);
 109
 110                                                 # now that we can be sure that no pseudo-sections are in the source,
 111                                                 # split it up by section
 112                                                 $secs =
 113                                                   preg_split(
 114                                                   "/(^=+.*?=+|^<h[1-6].*?" . ">.*?<\/h[1-6].*?" . ">)/mi",
 115                                                   $striptext, -1,
 116                                                   PREG_SPLIT_DELIM_CAPTURE);
 117
 118                                                 if($section==0) {
 119                                                         $rv=$secs[0];
 120                                                 } else {
 121                                                         $rv=$secs[$section*2-1] . $secs[$section*2];
 122                                                 }
 123
 124                                                 # reinsert stripped tags
 125                                                 $rv=$parser->unstrip($rv,$striparray);
 126                                                 $rv=trim($rv);
 127                                                 wfProfileOut( $fname );
 128                                                 return $rv;
 129                                         }
 130                                 }
 131                                 wfProfileOut( $fname );
 132                                 return $this->mContent;
 133                         }
 134                 }
 135         }
 136
 137         # Load the revision (including cur_text) into this object
 138         function loadContent( $noredir = false )
 139         {
 140                 global $wgOut, $wgMwRedir, $wgRequest;
 141
 142                 # Query variables :P
 143                 $oldid = $wgRequest->getVal( 'oldid' );
 144                 $redirect = $wgRequest->getVal( 'redirect' );
 145
 146                 if ( $this->mContentLoaded ) return;
 147                 $fname = "Article::loadContent";
 148
 149                 # Pre-fill content with error message so that if something
 150                 # fails we'll have something telling us what we intended.
 151
 152                 $t = $this->mTitle->getPrefixedText();
 153                 if ( isset( $oldid ) ) {
 154                         $oldid = IntVal( $oldid );
 155                         $t .= ",oldid={$oldid}";
 156                 }
 157                 if ( isset( $redirect ) ) {
 158                         $redirect = ($redirect == "no") ? "no" : "yes";
 159                         $t .= ",redirect={$redirect}";
 160                 }
 161                 $this->mContent = wfMsg( "missingarticle", $t );
 162
 163                 if ( ! $oldid ) {       # Retrieve current version
 164                         $id = $this->getID();
 165                         if ( 0 == $id ) return;
 166
 167                         $sql = "SELECT " .
 168                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 169                           "FROM cur WHERE cur_id={$id}";
 170                         wfDebug( "$sql\n" );
 171                         $res = wfQuery( $sql, DB_READ, $fname );
 172                         if ( 0 == wfNumRows( $res ) ) {
 173                                 return;
 174                         }
 175
 176                         $s = wfFetchObject( $res );
 177                         # If we got a redirect, follow it (unless we've been told
 178                         # not to by either the function parameter or the query
 179                         if ( ( "no" != $redirect ) && ( false == $noredir ) &&
 180                           ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
 181                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 182                                   $s->cur_text, $m ) ) {
 183                                         $rt = Title::newFromText( $m[1] );
 184                                         if( $rt ) {
 185                                                 # Gotta hand redirects to special pages differently:
 186                                                 # Fill the HTTP response "Location" header and ignore
 187                                                 # the rest of the page we're on.
 188
 189                                                 if ( $rt->getInterwiki() != "" ) {
 190                                                         $wgOut->redirect( $rt->getFullURL() ) ;
 191                                                         return;
 192                                                 }
 193                                                 if ( $rt->getNamespace() == Namespace::getSpecial() ) {
 194                                                         $wgOut->redirect( $rt->getFullURL() );
 195                                                         return;
 196                                                 }
 197                                                 $rid = $rt->getArticleID();
 198                                                 if ( 0 != $rid ) {
 199                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 200                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 201                                                         $res = wfQuery( $sql, DB_READ, $fname );
 202
 203                                                         if ( 0 != wfNumRows( $res ) ) {
 204                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 205                                                                 $this->mTitle = $rt;
 206                                                                 $s = wfFetchObject( $res );
 207                                                         }
 208                                                 }
 209                                         }
 210                                 }
 211                         }
 212
 213                         $this->mContent = $s->cur_text;
 214                         $this->mUser = $s->cur_user;
 215                         $this->mCounter = $s->cur_counter;
 216                         $this->mTimestamp = $s->cur_timestamp;
 217                         $this->mTouched = $s->cur_touched;
 218                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 219                         $this->mTitle->mRestrictionsLoaded = true;
 220                         wfFreeResult( $res );
 221                 } else { # oldid set, retrieve historical version
 222                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 223                           "WHERE old_id={$oldid}";
 224                         $res = wfQuery( $sql, DB_READ, $fname );
 225                         if ( 0 == wfNumRows( $res ) ) { return; }
 226
 227                         $s = wfFetchObject( $res );
 228                         $this->mContent = Article::getRevisionText( $s );
 229                         $this->mUser = $s->old_user;
 230                         $this->mCounter = 0;
 231                         $this->mTimestamp = $s->old_timestamp;
 232                         wfFreeResult( $res );
 233                 }
 234                 $this->mContentLoaded = true;
 235                 return $this->mContent;
 236         }
 237
 238         # Gets the article text without using so many damn globals
 239         # Returns false on error
 240         function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
 241                 global $wgMwRedir;
 242
 243                 if ( $this->mContentLoaded ) {
 244                         return $this->mContent;
 245                 }
 246                 $this->mContent = false;
 247
 248                 $fname = "Article::loadContent";
 249
 250                 if ( ! $oldid ) {       # Retrieve current version
 251                         $id = $this->getID();
 252                         if ( 0 == $id ) {
 253                                 return false;
 254                         }
 255
 256                         $sql = "SELECT " .
 257                           "cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched " .
 258                           "FROM cur WHERE cur_id={$id}";
 259                         $res = wfQuery( $sql, DB_READ, $fname );
 260                         if ( 0 == wfNumRows( $res ) ) {
 261                                 return false;
 262                         }
 263
 264                         $s = wfFetchObject( $res );
 265                         # If we got a redirect, follow it (unless we've been told
 266                         # not to by either the function parameter or the query
 267                         if ( !$noredir && $wgMwRedir->matchStart( $s->cur_text ) ) {
 268                                 if ( preg_match( "/\\[\\[([^\\]\\|]+)[\\]\\|]/",
 269                                   $s->cur_text, $m ) ) {
 270                                         $rt = Title::newFromText( $m[1] );
 271                                         if( $rt &&  $rt->getInterwiki() == "" && $rt->getNamespace() != Namespace::getSpecial() ) {
 272                                                 $rid = $rt->getArticleID();
 273                                                 if ( 0 != $rid ) {
 274                                                         $sql = "SELECT cur_text,cur_timestamp,cur_user," .
 275                                                           "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
 276                                                         $res = wfQuery( $sql, DB_READ, $fname );
 277
 278                                                         if ( 0 != wfNumRows( $res ) ) {
 279                                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 280                                                                 $this->mTitle = $rt;
 281                                                                 $s = wfFetchObject( $res );
 282                                                         }
 283                                                 }
 284                                         }
 285                                 }
 286                         }
 287
 288                         $this->mContent = $s->cur_text;
 289                         $this->mUser = $s->cur_user;
 290                         $this->mCounter = $s->cur_counter;
 291                         $this->mTimestamp = $s->cur_timestamp;
 292                         $this->mTouched = $s->cur_touched;
 293                         $this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
 294                         $this->mTitle->mRestrictionsLoaded = true;
 295                         wfFreeResult( $res );
 296                 } else { # oldid set, retrieve historical version
 297                         $sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM old " .
 298                           "WHERE old_id={$oldid}";
 299                         $res = wfQuery( $sql, DB_READ, $fname );
 300                         if ( 0 == wfNumRows( $res ) ) {
 301                                 return false;
 302                         }
 303
 304                         $s = wfFetchObject( $res );
 305                         $this->mContent = Article::getRevisionText( $s );
 306                         $this->mUser = $s->old_user;
 307                         $this->mCounter = 0;
 308                         $this->mTimestamp = $s->old_timestamp;
 309                         wfFreeResult( $res );
 310                 }
 311                 $this->mContentLoaded = true;
 312                 return $this->mContent;
 313         }
 314
 315         function getID() {
 316                 if( $this->mTitle ) {
 317                         return $this->mTitle->getArticleID();
 318                 } else {
 319                         return 0;
 320                 }
 321         }
 322
 323         function getCount()
 324         {
 325                 if ( -1 == $this->mCounter ) {
 326                         $id = $this->getID();
 327                         $this->mCounter = wfGetSQL( "cur", "cur_counter", "cur_id={$id}" );
 328                 }
 329                 return $this->mCounter;
 330         }
 331
 332         # Would the given text make this article a "good" article (i.e.,
 333         # suitable for including in the article count)?
 334
 335         function isCountable( $text )
 336         {
 337                 global $wgUseCommaCount, $wgMwRedir;
 338
 339                 if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
 340                 if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
 341                 $token = ($wgUseCommaCount ? "," : "[[" );
 342                 if ( false === strstr( $text, $token ) ) { return 0; }
 343                 return 1;
 344         }
 345
 346         # Loads everything from cur except cur_text
 347         # This isn't necessary for all uses, so it's only done if needed.
 348
 349         /* private */ function loadLastEdit()
 350         {
 351                 global $wgOut;
 352                 if ( -1 != $this->mUser ) return;
 353
 354                 $sql = "SELECT cur_user,cur_user_text,cur_timestamp," .
 355                   "cur_comment,cur_minor_edit FROM cur WHERE " .
 356                   "cur_id=" . $this->getID();
 357                 $res = wfQuery( $sql, DB_READ, "Article::loadLastEdit" );
 358
 359                 if ( wfNumRows( $res ) > 0 ) {
 360                         $s = wfFetchObject( $res );
 361                         $this->mUser = $s->cur_user;
 362                         $this->mUserText = $s->cur_user_text;
 363                         $this->mTimestamp = $s->cur_timestamp;
 364                         $this->mComment = $s->cur_comment;
 365                         $this->mMinorEdit = $s->cur_minor_edit;
 366                 }
 367         }
 368
 369         function getTimestamp()
 370         {
 371                 $this->loadLastEdit();
 372                 return $this->mTimestamp;
 373         }
 374
 375         function getUser()
 376         {
 377                 $this->loadLastEdit();
 378                 return $this->mUser;
 379         }
 380
 381         function getUserText()
 382         {
 383                 $this->loadLastEdit();
 384                 return $this->mUserText;
 385         }
 386
 387         function getComment()
 388         {
 389                 $this->loadLastEdit();
 390                 return $this->mComment;
 391         }
 392
 393         function getMinorEdit()
 394         {
 395                 $this->loadLastEdit();
 396                 return $this->mMinorEdit;
 397         }
 398
 399         function getContributors($limit = 0, $offset = 0)
 400         {
 401                 $fname = "Article::getContributors";
 402
 403                 # XXX: this is expensive; cache this info somewhere.
 404
 405                 $title = $this->mTitle;
 406
 407                 $contribs = array();
 408
 409                 $sql = "SELECT old.old_user, old.old_user_text, " .
 410                        "  user.user_real_name, MAX(old.old_timestamp) as timestamp" .
 411                        " FROM old, user " .
 412                        " WHERE old.old_user = user.user_id " .
 413                        " AND old.old_namespace = " . $title->getNamespace() .
 414                        " AND old.old_title = \"" . $title->getDBkey() . "\"" .
 415                        " AND old.old_user != 0 " .
 416                        " AND old.old_user != " . $this->getUser() .
 417                        " GROUP BY old.old_user " .
 418                        " ORDER BY timestamp DESC ";
 419
 420                 if ($limit > 0) {
 421                         $sql .= " LIMIT $limit";
 422                 }
 423
 424                 $res = wfQuery($sql, DB_READ, $fname);
 425
 426                 while ( $line = wfFetchObject( $res ) ) {
 427                         $contribs[$line->old_user] =
 428                                 array($line->old_user_text, $line->user_real_name);
 429                 }
 430
 431                 # Count anonymous users
 432
 433                 $res = wfQuery("SELECT COUNT(*) AS cnt " .
 434                                " FROM old " .
 435                                " WHERE old_namespace = " . $title->getNamespace() .
 436                                " AND old_title = '" . $title->getDBkey() . "'" .
 437                                " AND old_user = 0 ", DB_READ, $fname);
 438
 439                 while ( $line = wfFetchObject( $res ) ) {
 440                         $contribs[0] = array($line->cnt, 'Anonymous');
 441                 }
 442
 443                 return $contribs;
 444         }
 445
 446         # This is the default action of the script: just view the page of
 447         # the given title.
 448
 449         function view()
 450         {
 451                 global $wgUser, $wgOut, $wgLang, $wgRequest;
 452                 global $wgLinkCache, $IP, $wgEnableParserCache;
 453
 454                 $fname = "Article::view";
 455                 wfProfileIn( $fname );
 456
 457                 # Get variables from query string :P
 458                 $oldid = $wgRequest->getVal( 'oldid' );
 459                 $diff = $wgRequest->getVal( 'diff' );
 460
 461                 $wgOut->setArticleFlag( true );
 462                 $wgOut->setRobotpolicy( "index,follow" );
 463
 464                 # If we got diff and oldid in the query, we want to see a
 465                 # diff page instead of the article.
 466
 467                 if ( !is_null( $diff ) ) {
 468                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 469                         $de = new DifferenceEngine( intval($oldid), intval($diff) );
 470                         $de->showDiffPage();
 471                         wfProfileOut( $fname );
 472                         return;
 473                 }
 474
 475                 if ( !is_null( $oldid ) and $this->checkTouched() ) {
 476                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 477                                 return;
 478                         } else if ( $this->tryFileCache() ) {
 479                                 # tell wgOut that output is taken care of
 480                                 $wgOut->disable();
 481                                 $this->viewUpdates();
 482                                 return;
 483                         }
 484                 }
 485
 486                 $text = $this->getContent( false ); # May change mTitle by following a redirect
 487                 $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 488
 489                 # We're looking at an old revision
 490
 491                 if ( !empty( $oldid ) ) {
 492                         $this->setOldSubtitle();
 493                         $wgOut->setRobotpolicy( "noindex,follow" );
 494                 }
 495                 if ( "" != $this->mRedirectedFrom ) {
 496                         $sk = $wgUser->getSkin();
 497                         $redir = $sk->makeKnownLink( $this->mRedirectedFrom, "",
 498                           "redirect=no" );
 499                         $s = wfMsg( "redirectedfrom", $redir );
 500                         $wgOut->setSubtitle( $s );
 501                 }
 502
 503                 $wgLinkCache->preFill( $this->mTitle );
 504
 505                 # wrap user css and user js in pre and don't parse
 506                 if (
 507                         $this->mTitle->getNamespace() == Namespace::getUser() &&
 508                         preg_match("/\\/[\\w]+\\.(css|js)$/", $this->mTitle->getDBkey())
 509                 ) {
 510                         $wgOut->addWikiText( wfMsg('usercssjs'));
 511                         $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 512                 } else if( $wgEnableParserCache && intval($wgUser->getOption( "stubthreshold" )) == 0 ){
 513                         $wgOut->addWikiText( $text, true, $this );
 514                 } else {
 515                         $wgOut->addWikiText( $text );
 516                 }
 517
 518                 # Add link titles as META keywords
 519                 $wgOut->addMetaTags() ;
 520
 521                 $this->viewUpdates();
 522                 wfProfileOut( $fname );
 523         }
 524
 525         # Theoretically we could defer these whole insert and update
 526         # functions for after display, but that's taking a big leap
 527         # of faith, and we want to be able to report database
 528         # errors at some point.
 529
 530         /* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
 531         {
 532                 global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
 533                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 534
 535                 $fname = "Article::insertNewArticle";
 536
 537                 $this->mCountAdjustment = $this->isCountable( $text );
 538
 539                 $ns = $this->mTitle->getNamespace();
 540                 $ttl = $this->mTitle->getDBkey();
 541                 $text = $this->preSaveTransform( $text );
 542                 if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
 543                 else { $redir = 0; }
 544
 545                 $now = wfTimestampNow();
 546                 $won = wfInvertTimestamp( $now );
 547                 wfSeedRandom();
 548                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, ".", "" );
 549                 $isminor = ( $isminor && $wgUser->getID() ) ? 1 : 0;
 550                 $sql = "INSERT INTO cur (cur_namespace,cur_title,cur_text," .
 551                   "cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter," .
 552                   "cur_restrictions,cur_user_text,cur_is_redirect," .
 553                   "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$ns},'" . wfStrencode( $ttl ) . "', '" .
 554                   wfStrencode( $text ) . "', '" .
 555                   wfStrencode( $summary ) . "', '" .
 556                   $wgUser->getID() . "', '{$now}', " .
 557                   $isminor . ", 0, '', '" .
 558                   wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
 559                 $res = wfQuery( $sql, DB_WRITE, $fname );
 560
 561                 $newid = wfInsertId();
 562                 $this->mTitle->resetArticleID( $newid );
 563
 564                 Article::onArticleCreate( $this->mTitle );
 565                 RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );
 566
 567                 if ($watchthis) {
 568                         if(!$this->mTitle->userIsWatching()) $this->watch();
 569                 } else {
 570                         if ( $this->mTitle->userIsWatching() ) {
 571                                 $this->unwatch();
 572                         }
 573                 }
 574
 575                 # The talk page isn't in the regular link tables, so we need to update manually:
 576                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
 577                 $sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
 578                 wfQuery( $sql, DB_WRITE );
 579
 580                 # standard deferred updates
 581                 $this->editUpdates( $text );
 582
 583                 $this->showArticle( $text, wfMsg( "newarticle" ) );
 584         }
 585
 586
 587         /* Side effects: loads last edit */
 588         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = ""){
 589                 $this->loadLastEdit();
 590                 $oldtext = $this->getContent( true );
 591                 if ($section != "") {
 592                         if($section=="new") {
 593                                 if($summary) $subject="== {$summary} ==\n\n";
 594                                 $text=$oldtext."\n\n".$subject.$text;
 595                         } else {
 596
 597                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 598                                 # comments to be stripped as well)
 599                                 $striparray=array();
 600                                 $parser=new Parser();
 601                                 $parser->mOutputType=OT_WIKI;
 602                                 $oldtext=$parser->strip($oldtext, $striparray, true);
 603
 604                                 # now that we can be sure that no pseudo-sections are in the source,
 605                                 # split it up
 606                                 $secs=preg_split("/(^=+.*?=+|^<h[1-6].*?" . ">.*?<\/h[1-6].*?" . ">)/mi",
 607                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
 608                                 $secs[$section*2]=$text."\n\n"; // replace with edited
 609                                 if($section) { $secs[$section*2-1]=""; } // erase old headline
 610                                 $text=join("",$secs);
 611
 612                                 # reinsert the stuff that we stripped out earlier
 613                                 $text=$parser->unstrip($text,$striparray,true);
 614                         }
 615                 }
 616                 return $text;
 617         }
 618
 619         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false )
 620         {
 621                 global $wgOut, $wgUser, $wgLinkCache;
 622                 global $wgDBtransactions, $wgMwRedir;
 623                 global $wgUseSquid, $wgInternalServer;
 624                 $fname = "Article::updateArticle";
 625
 626                 if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
 627                 if ( $minor && $wgUser->getID() ) { $me2 = 1; } else { $me2 = 0; }
 628                 if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ")[^\\n]+)/i", $text, $m ) ) {
 629                         $redir = 1;
 630                         $text = $m[1] . "\n"; # Remove all content but redirect
 631                 }
 632                 else { $redir = 0; }
 633
 634                 $text = $this->preSaveTransform( $text );
 635
 636                 # Update article, but only if changed.
 637
 638                 if( $wgDBtransactions ) {
 639                         $sql = "BEGIN";
 640                         wfQuery( $sql, DB_WRITE );
 641                 }
 642                 $oldtext = $this->getContent( true );
 643
 644                 if ( 0 != strcmp( $text, $oldtext ) ) {
 645                         $this->mCountAdjustment = $this->isCountable( $text )
 646                           - $this->isCountable( $oldtext );
 647
 648                         $now = wfTimestampNow();
 649                         $won = wfInvertTimestamp( $now );
 650                         $sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
 651                           "',cur_comment='" .  wfStrencode( $summary ) .
 652                           "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
 653                           ",cur_timestamp='{$now}',cur_user_text='" .
 654                           wfStrencode( $wgUser->getName() ) .
 655                           "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
 656                           "WHERE cur_id=" . $this->getID() .
 657                           " AND cur_timestamp='" . $this->getTimestamp() . "'";
 658                         $res = wfQuery( $sql, DB_WRITE, $fname );
 659
 660                         if( wfAffectedRows() == 0 ) {
 661                                 /* Belated edit conflict! Run away!! */
 662                                 return false;
 663                         }
 664
 665                         # This overwrites $oldtext if revision compression is on
 666                         $flags = Article::compressRevisionText( $oldtext );
 667
 668                         $sql = "INSERT INTO old (old_namespace,old_title,old_text," .
 669                           "old_comment,old_user,old_user_text,old_timestamp," .
 670                           "old_minor_edit,inverse_timestamp,old_flags) VALUES (" .
 671                           $this->mTitle->getNamespace() . ", '" .
 672                           wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
 673                           wfStrencode( $oldtext ) . "', '" .
 674                           wfStrencode( $this->getComment() ) . "', " .
 675                           $this->getUser() . ", '" .
 676                           wfStrencode( $this->getUserText() ) . "', '" .
 677                           $this->getTimestamp() . "', " . $me1 . ", '" .
 678                           wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
 679                         $res = wfQuery( $sql, DB_WRITE, $fname );
 680                         $oldid = wfInsertID( $res );
 681
 682                         $bot = (int)($wgUser->isBot() || $forceBot);
 683                         RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $summary,
 684                                 $oldid, $this->getTimestamp(), $bot );
 685                         Article::onArticleEdit( $this->mTitle );
 686                 }
 687
 688                 if( $wgDBtransactions ) {
 689                         $sql = "COMMIT";
 690                         wfQuery( $sql, DB_WRITE );
 691                 }
 692
 693                 if ($watchthis) {
 694                         if (!$this->mTitle->userIsWatching()) $this->watch();
 695                 } else {
 696                         if ( $this->mTitle->userIsWatching() ) {
 697                                 $this->unwatch();
 698                         }
 699                 }
 700                 # standard deferred updates
 701                 $this->editUpdates( $text );
 702
 703
 704                 $urls = array();
 705                 # Template namespace
 706                 # Purge all articles linking here
 707                 if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
 708                         $titles = $this->mTitle->getLinksTo();
 709                         Title::touchArray( $titles );
 710                         if ( $wgUseSquid ) {
 711                                 foreach ( $titles as $title ) {
 712                                         $urls[] = $title->getInternalURL();
 713                                 }
 714                         }
 715                 }
 716
 717                 # Squid updates
 718                 if ( $wgUseSquid ) {
 719                         $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
 720                         $u = new SquidUpdate( $urls );
 721                         $u->doUpdate();
 722                 }
 723
 724                 $this->showArticle( $text, wfMsg( "updated" ) );
 725                 return true;
 726         }
 727
 728         # After we've either updated or inserted the article, update
 729         # the link tables and redirect to the new page.
 730
 731         function showArticle( $text, $subtitle )
 732         {
 733                 global $wgOut, $wgUser, $wgLinkCache;
 734                 global $wgMwRedir;
 735
 736                 $wgLinkCache = new LinkCache();
 737
 738                 # Get old version of link table to allow incremental link updates
 739                 $wgLinkCache->preFill( $this->mTitle );
 740                 $wgLinkCache->clear();
 741
 742                 # Now update the link cache by parsing the text
 743                 $wgOut = new OutputPage();
 744                 $wgOut->addWikiText( $text );
 745
 746                 if( $wgMwRedir->matchStart( $text ) )
 747                         $r = "redirect=no";
 748                 else
 749                         $r = "";
 750                 $wgOut->redirect( $this->mTitle->getFullURL( $r ) );
 751         }
 752
 753         # Add this page to my watchlist
 754
 755         function watch( $add = true )
 756         {
 757                 global $wgUser, $wgOut, $wgLang;
 758                 global $wgDeferredUpdateList;
 759
 760                 if ( 0 == $wgUser->getID() ) {
 761                         $wgOut->errorpage( "watchnologin", "watchnologintext" );
 762                         return;
 763                 }
 764                 if ( wfReadOnly() ) {
 765                         $wgOut->readOnlyPage();
 766                         return;
 767                 }
 768                 if( $add )
 769                         $wgUser->addWatch( $this->mTitle );
 770                 else
 771                         $wgUser->removeWatch( $this->mTitle );
 772
 773                 $wgOut->setPagetitle( wfMsg( $add ? "addedwatch" : "removedwatch" ) );
 774                 $wgOut->setRobotpolicy( "noindex,follow" );
 775
 776                 $sk = $wgUser->getSkin() ;
 777                 $link = $this->mTitle->getPrefixedText();
 778
 779                 if($add)
 780                         $text = wfMsg( "addedwatchtext", $link );
 781                 else
 782                         $text = wfMsg( "removedwatchtext", $link );
 783                 $wgOut->addWikiText( $text );
 784
 785                 $up = new UserUpdate();
 786                 array_push( $wgDeferredUpdateList, $up );
 787
 788                 $wgOut->returnToMain( false );
 789         }
 790
 791         function unwatch()
 792         {
 793                 $this->watch( false );
 794         }
 795
 796         function protect( $limit = "sysop" )
 797         {
 798                 global $wgUser, $wgOut, $wgRequest;
 799
 800                 if ( ! $wgUser->isSysop() ) {
 801                         $wgOut->sysopRequired();
 802                         return;
 803                 }
 804                 if ( wfReadOnly() ) {
 805                         $wgOut->readOnlyPage();
 806                         return;
 807                 }
 808                 $id = $this->mTitle->getArticleID();
 809                 if ( 0 == $id ) {
 810                         $wgOut->fatalError( wfMsg( "badarticleerror" ) );
 811                         return;
 812                 }
 813
 814                 $confirm = $wgRequest->getBool( 'wpConfirmProtect' ) && $wgRequest->wasPosted();
 815                 $reason = $wgRequest->getText( 'wpReasonProtect' );
 816
 817                 if ( $confirm ) {
 818
 819         $sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
 820                         "cur_restrictions='{$limit}' WHERE cur_id={$id}";
 821                 wfQuery( $sql, DB_WRITE, "Article::protect" );
 822
 823                 $log = new LogPage( wfMsg( "protectlogpage" ), wfMsg( "protectlogtext" ) );
 824                 if ( $limit === "" ) {
 825                                 $log->addEntry( wfMsg( "unprotectedarticle", $this->mTitle->getPrefixedText() ), $reason );
 826                 } else {
 827                                 $log->addEntry( wfMsg( "protectedarticle", $this->mTitle->getPrefixedText() ), $reason );
 828                 }
 829                 $wgOut->redirect( $this->mTitle->getFullURL() );
 830                         return;
 831                 } else {
 832                         $reason = htmlspecialchars( wfMsg( "protectreason" ) );
 833                         return $this->confirmProtect( "", $reason, $limit );
 834                 }
 835         }
 836
 837                 # Output protection confirmation dialog
 838         function confirmProtect( $par, $reason, $limit = "sysop"  )
 839         {
 840                 global $wgOut;
 841
 842                 wfDebug( "Article::confirmProtect\n" );
 843
 844                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
 845                 $wgOut->setRobotpolicy( "noindex,nofollow" );
 846
 847                 $check = "";
 848                 $protcom = "";
 849
 850                 if ( $limit === "" ) {
 851                         $wgOut->setSubtitle( wfMsg( "unprotectsub", $sub ) );
 852                         $wgOut->addWikiText( wfMsg( "confirmunprotecttext" ) );
 853                         $check = htmlspecialchars( wfMsg( "confirmunprotect" ) );
 854                         $protcom = htmlspecialchars( wfMsg( "unprotectcomment" ) );
 855                         $formaction = $this->mTitle->escapeLocalURL( "action=unprotect" . $par );
 856                 } else {
 857                         $wgOut->setSubtitle( wfMsg( "protectsub", $sub ) );
 858                         $wgOut->addWikiText( wfMsg( "confirmprotecttext" ) );
 859                         $check = htmlspecialchars( wfMsg( "confirmprotect" ) );
 860                         $protcom = htmlspecialchars( wfMsg( "protectcomment" ) );
 861                         $formaction = $this->mTitle->escapeLocalURL( "action=protect" . $par );
 862                 }
 863
 864                 $confirm = htmlspecialchars( wfMsg( "confirm" ) );
 865
 866                 $wgOut->addHTML( "
 867 <form id='protectconfirm' method='post' action=\"{$formaction}\">
 868         <table border='0'>
 869                 <tr>
 870                         <td align='right'>
 871                                 <label for='wpReasonProtect'>{$protcom}:</label>
 872                         </td>
 873                         <td align='left'>
 874                                 <input type='text' size='60' name='wpReasonProtect' id='wpReasonProtect' value=\"" . htmlspecialchars( $reason ) . "\" />
 875                         </td>
 876                 </tr>
 877                 <tr>
 878                         <td>&nbsp;</td>
 879                 </tr>
 880                 <tr>
 881                         <td align='right'>
 882                                 <input type='checkbox' name='wpConfirmProtect' value='1' id='wpConfirmProtect' />
 883                         </td>
 884                         <td>
 885                                 <label for='wpConfirmProtect'>{$check}</label>
 886                         </td>
 887                 </tr>
 888                 <tr>
 889                         <td>&nbsp;</td>
 890                         <td>
 891                                 <input type='submit' name='wpConfirmProtectB' value=\"{$confirm}\" />
 892                         </td>
 893                 </tr>
 894         </table>
 895 </form>\n" );
 896
 897                 $wgOut->returnToMain( false );
 898         }
 899
 900         function unprotect()
 901         {
 902                 return $this->protect( "" );
 903         }
 904
 905         # UI entry point for page deletion
 906         function delete()
 907         {
 908                 global $wgUser, $wgOut, $wgMessageCache, $wgRequest;
 909                 $fname = "Article::delete";
 910                 $confirm = $wgRequest->getBool( 'wpConfirm' ) && $wgRequest->wasPosted();
 911                 $reason = $wgRequest->getText( 'wpReason' );
 912
 913                 # This code desperately needs to be totally rewritten
 914
 915                 # Check permissions
 916                 if ( ( ! $wgUser->isSysop() ) ) {
 917                         $wgOut->sysopRequired();
 918                         return;
 919                 }
 920                 if ( wfReadOnly() ) {
 921                         $wgOut->readOnlyPage();
 922                         return;
 923                 }
 924
 925                 # Better double-check that it hasn't been deleted yet!
 926                 $wgOut->setPagetitle( wfMsg( "confirmdelete" ) );
 927                 if ( ( "" == trim( $this->mTitle->getText() ) )
 928                   or ( $this->mTitle->getArticleId() == 0 ) ) {
 929                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
 930                         return;
 931                 }
 932
 933                 if ( $confirm ) {
 934                         $this->doDelete( $reason );
 935                         return;
 936                 }
 937
 938                 # determine whether this page has earlier revisions
 939                 # and insert a warning if it does
 940                 # we select the text because it might be useful below
 941                 $ns = $this->mTitle->getNamespace();
 942                 $title = $this->mTitle->getDBkey();
 943                 $etitle = wfStrencode( $title );
 944                 $sql = "SELECT old_text,old_flags FROM old WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
 945                 $res = wfQuery( $sql, DB_READ, $fname );
 946                 if( ($old=wfFetchObject($res)) && !$confirm ) {
 947                         $skin=$wgUser->getSkin();
 948                         $wgOut->addHTML("<b>".wfMsg("historywarning"));
 949                         $wgOut->addHTML( $skin->historyLink() ."</b>");
 950                 }
 951
 952                 $sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
 953                 $res=wfQuery($sql, DB_READ, $fname);
 954                 if( ($s=wfFetchObject($res))) {
 955
 956                         # if this is a mini-text, we can paste part of it into the deletion reason
 957
 958                         #if this is empty, an earlier revision may contain "useful" text
 959                         $blanked = false;
 960                         if($s->cur_text!="") {
 961                                 $text=$s->cur_text;
 962                         } else {
 963                                 if($old) {
 964                                         $text = Article::getRevisionText( $old );
 965                                         $blanked = true;
 966                                 }
 967
 968                         }
 969
 970                         $length=strlen($text);
 971
 972                         # this should not happen, since it is not possible to store an empty, new
 973                         # page. Let's insert a standard text in case it does, though
 974                         if($length == 0 && $reason === "") {
 975                                 $reason = wfMsg("exblank");
 976                         }
 977
 978                         if($length < 500 && $reason === "") {
 979
 980                                 # comment field=255, let's grep the first 150 to have some user
 981                                 # space left
 982                                 $text=substr($text,0,150);
 983                                 # let's strip out newlines and HTML tags
 984                                 $text=preg_replace("/\"/","'",$text);
 985                                 $text=preg_replace("/\</","&lt;",$text);
 986                                 $text=preg_replace("/\>/","&gt;",$text);
 987                                 $text=preg_replace("/[\n\r]/","",$text);
 988                                 if(!$blanked) {
 989                                         $reason=wfMsg("excontent"). " '".$text;
 990                                 } else {
 991                                         $reason=wfMsg("exbeforeblank") . " '".$text;
 992                                 }
 993                                 if($length>150) { $reason .= "..."; } # we've only pasted part of the text
 994                                 $reason.="'";
 995                         }
 996                 }
 997
 998                 return $this->confirmDelete( "", $reason );
 999         }
1000
1001         # Output deletion confirmation dialog
1002         function confirmDelete( $par, $reason )
1003         {
1004                 global $wgOut;
1005
1006                 wfDebug( "Article::confirmDelete\n" );
1007
1008                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1009                 $wgOut->setSubtitle( wfMsg( "deletesub", $sub ) );
1010                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1011                 $wgOut->addWikiText( wfMsg( "confirmdeletetext" ) );
1012
1013                 $formaction = $this->mTitle->escapeLocalURL( "action=delete" . $par );
1014
1015                 $confirm = htmlspecialchars( wfMsg( "confirm" ) );
1016                 $check = htmlspecialchars( wfMsg( "confirmcheck" ) );
1017                 $delcom = htmlspecialchars( wfMsg( "deletecomment" ) );
1018
1019                 $wgOut->addHTML( "
1020 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1021         <table border='0'>
1022                 <tr>
1023                         <td align='right'>
1024                                 <label for='wpReason'>{$delcom}:</label>
1025                         </td>
1026                         <td align='left'>
1027                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1028                         </td>
1029                 </tr>
1030                 <tr>
1031                         <td>&nbsp;</td>
1032                 </tr>
1033                 <tr>
1034                         <td align='right'>
1035                                 <input type='checkbox' name='wpConfirm' value='1' id='wpConfirm' />
1036                         </td>
1037                         <td>
1038                                 <label for='wpConfirm'>{$check}</label>
1039                         </td>
1040                 </tr>
1041                 <tr>
1042                         <td>&nbsp;</td>
1043                         <td>
1044                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1045                         </td>
1046                 </tr>
1047         </table>
1048 </form>\n" );
1049
1050                 $wgOut->returnToMain( false );
1051         }
1052
1053         # Perform a deletion and output success or failure messages
1054         function doDelete( $reason )
1055         {
1056                 global $wgOut, $wgUser, $wgLang;
1057                 $fname = "Article::doDelete";
1058                 wfDebug( "$fname\n" );
1059
1060                 if ( $this->doDeleteArticle( $reason ) ) {
1061                         $deleted = $this->mTitle->getPrefixedText();
1062
1063                         $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1064                         $wgOut->setRobotpolicy( "noindex,nofollow" );
1065
1066                         $sk = $wgUser->getSkin();
1067                         $loglink = $sk->makeKnownLink( $wgLang->getNsText(
1068                           Namespace::getWikipedia() ) .
1069                           ":" . wfMsg( "dellogpage" ), wfMsg( "deletionlog" ) );
1070
1071                         $text = wfMsg( "deletedtext", $deleted, $loglink );
1072
1073                         $wgOut->addHTML( "<p>" . $text . "</p>\n" );
1074                         $wgOut->returnToMain( false );
1075                 } else {
1076                         $wgOut->fatalError( wfMsg( "cannotdelete" ) );
1077                 }
1078         }
1079
1080         # Back-end article deletion
1081         # Deletes the article with database consistency, writes logs, purges caches
1082         # Returns success
1083         function doDeleteArticle( $reason )
1084         {
1085                 global $wgUser, $wgLang;
1086                 global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
1087
1088                 $fname = "Article::doDeleteArticle";
1089                 wfDebug( "$fname\n" );
1090
1091                 $ns = $this->mTitle->getNamespace();
1092                 $t = wfStrencode( $this->mTitle->getDBkey() );
1093                 $id = $this->mTitle->getArticleID();
1094
1095                 if ( "" == $t || $id == 0 ) {
1096                         return false;
1097                 }
1098
1099                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
1100                 array_push( $wgDeferredUpdateList, $u );
1101
1102                 $linksTo = $this->mTitle->getLinksTo();
1103
1104                 # Squid purging
1105                 if ( $wgUseSquid ) {
1106                         $urls = array(
1107                                 $this->mTitle->getInternalURL(),
1108                                 $this->mTitle->getInternalURL( "history" )
1109                         );
1110                         foreach ( $linksTo as $linkTo ) {
1111                                 $urls[] = $linkTo->getInternalURL();
1112                         }
1113
1114                         $u = new SquidUpdate( $urls );
1115                         array_push( $wgDeferredUpdateList, $u );
1116
1117                 }
1118
1119                 # Client and file cache invalidation
1120                 Title::touchArray( $linksTo );
1121
1122                 # Move article and history to the "archive" table
1123                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
1124                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
1125                   "ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment," .
1126                   "cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur " .
1127                   "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
1128                 wfQuery( $sql, DB_WRITE, $fname );
1129
1130                 $sql = "INSERT INTO archive (ar_namespace,ar_title,ar_text," .
1131                   "ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit," .
1132                   "ar_flags) SELECT old_namespace,old_title,old_text,old_comment," .
1133                   "old_user,old_user_text,old_timestamp,old_minor_edit,old_flags " .
1134                   "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
1135                 wfQuery( $sql, DB_WRITE, $fname );
1136
1137                 # Now that it's safely backed up, delete it
1138
1139                 $sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
1140                   "cur_title='{$t}'";
1141                 wfQuery( $sql, DB_WRITE, $fname );
1142
1143                 $sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
1144                   "old_title='{$t}'";
1145                 wfQuery( $sql, DB_WRITE, $fname );
1146
1147                 $sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
1148                   "rc_title='{$t}'";
1149                 wfQuery( $sql, DB_WRITE, $fname );
1150
1151                 # Finally, clean up the link tables
1152                 $t = wfStrencode( $this->mTitle->getPrefixedDBkey() );
1153
1154                 Article::onArticleDelete( $this->mTitle );
1155
1156                 $sql = "INSERT INTO brokenlinks (bl_from,bl_to) VALUES ";
1157                 $first = true;
1158
1159                 foreach ( $linksTo as $titleObj ) {
1160                         if ( ! $first ) { $sql .= ","; }
1161                         $first = false;
1162                         # Get article ID. Efficient because it was loaded into the cache by getLinksTo().
1163                         $linkID = $titleObj->getArticleID();
1164                         $sql .= "({$linkID},'{$t}')";
1165                 }
1166                 if ( ! $first ) {
1167                         wfQuery( $sql, DB_WRITE, $fname );
1168                 }
1169
1170                 $sql = "DELETE FROM links WHERE l_to={$id}";
1171                 wfQuery( $sql, DB_WRITE, $fname );
1172
1173                 $sql = "DELETE FROM links WHERE l_from={$id}";
1174                 wfQuery( $sql, DB_WRITE, $fname );
1175
1176                 $sql = "DELETE FROM imagelinks WHERE il_from={$id}";
1177                 wfQuery( $sql, DB_WRITE, $fname );
1178
1179                 $sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
1180                 wfQuery( $sql, DB_WRITE, $fname );
1181
1182                 $log = new LogPage( wfMsg( "dellogpage" ), wfMsg( "dellogpagetext" ) );
1183                 $art = $this->mTitle->getPrefixedText();
1184                 $log->addEntry( wfMsg( "deletedarticle", $art ), $reason );
1185
1186                 # Clear the cached article id so the interface doesn't act like we exist
1187                 $this->mTitle->resetArticleID( 0 );
1188                 $this->mTitle->mArticleID = 0;
1189                 return true;
1190         }
1191
1192         function rollback()
1193         {
1194                 global $wgUser, $wgLang, $wgOut, $wgRequest;
1195
1196                 if ( ! $wgUser->isSysop() ) {
1197                         $wgOut->sysopRequired();
1198                         return;
1199                 }
1200                 if ( wfReadOnly() ) {
1201                         $wgOut->readOnlyPage( $this->getContent( true ) );
1202                         return;
1203                 }
1204
1205                 # Enhanced rollback, marks edits rc_bot=1
1206                 $bot = $wgRequest->getBool( 'bot' );
1207
1208                 # Replace all this user's current edits with the next one down
1209                 $tt = wfStrencode( $this->mTitle->getDBKey() );
1210                 $n = $this->mTitle->getNamespace();
1211
1212                 # Get the last editor
1213                 $sql = "SELECT cur_id,cur_user,cur_user_text,cur_comment FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
1214                 $res = wfQuery( $sql, DB_READ );
1215                 if( ($x = wfNumRows( $res )) != 1 ) {
1216                         # Something wrong
1217                         $wgOut->addHTML( wfMsg( "notanarticle" ) );
1218                         return;
1219                 }
1220                 $s = wfFetchObject( $res );
1221                 $ut = wfStrencode( $s->cur_user_text );
1222                 $uid = $s->cur_user;
1223                 $pid = $s->cur_id;
1224
1225                 $from = str_replace( '_', ' ', $wgRequest->getVal( "from" ) );
1226                 if( $from != $s->cur_user_text ) {
1227                         $wgOut->setPageTitle(wfmsg("rollbackfailed"));
1228                         $wgOut->addWikiText( wfMsg( "alreadyrolled",
1229                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
1230                                 htmlspecialchars( $from ),
1231                                 htmlspecialchars( $s->cur_user_text ) ) );
1232                         if($s->cur_comment != "") {
1233                                 $wgOut->addHTML(
1234                                         wfMsg("editcomment",
1235                                         htmlspecialchars( $s->cur_comment ) ) );
1236                         }
1237                         return;
1238                 }
1239
1240                 # Get the last edit not by this guy
1241                 $sql = "SELECT old_text,old_user,old_user_text,old_timestamp,old_flags
1242                 FROM old USE INDEX (name_title_timestamp)
1243                 WHERE old_namespace={$n} AND old_title='{$tt}'
1244                 AND (old_user <> {$uid} OR old_user_text <> '{$ut}')
1245                 ORDER BY inverse_timestamp LIMIT 1";
1246                 $res = wfQuery( $sql, DB_READ );
1247                 if( wfNumRows( $res ) != 1 ) {
1248                         # Something wrong
1249                         $wgOut->setPageTitle(wfMsg("rollbackfailed"));
1250                         $wgOut->addHTML( wfMsg( "cantrollback" ) );
1251                         return;
1252                 }
1253                 $s = wfFetchObject( $res );
1254
1255                 if ( $bot ) {
1256                         # Mark all reverted edits as bot
1257                         $sql = "UPDATE recentchanges SET rc_bot=1 WHERE
1258                                 rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
1259                         wfQuery( $sql, DB_WRITE, $fname );
1260                 }
1261
1262                 # Save it!
1263                 $newcomment = wfMsg( "revertpage", $s->old_user_text, $from );
1264                 $wgOut->setPagetitle( wfMsg( "actioncomplete" ) );
1265                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1266                 $wgOut->addHTML( "<h2>" . $newcomment . "</h2>\n<hr />\n" );
1267                 $this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
1268                 Article::onArticleEdit( $this->mTitle );
1269                 $wgOut->returnToMain( false );
1270         }
1271
1272
1273         # Do standard deferred updates after page view
1274
1275         /* private */ function viewUpdates()
1276         {
1277                 global $wgDeferredUpdateList;
1278                 if ( 0 != $this->getID() ) {
1279                         global $wgDisableCounters;
1280                         if( !$wgDisableCounters ) {
1281                                 Article::incViewCount( $this->getID() );
1282                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1283                                 array_push( $wgDeferredUpdateList, $u );
1284                         }
1285                         $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
1286                           $this->mTitle->getDBkey() );
1287                         array_push( $wgDeferredUpdateList, $u );
1288                 }
1289         }
1290
1291         # Do standard deferred updates after page edit.
1292         # Every 1000th edit, prune the recent changes table.
1293
1294         /* private */ function editUpdates( $text )
1295         {
1296                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
1297                 global $wgMessageCache;
1298
1299                 wfSeedRandom();
1300                 if ( 0 == mt_rand( 0, 999 ) ) {
1301                         $cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
1302                         $sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
1303                         wfQuery( $sql, DB_WRITE );
1304                 }
1305                 $id = $this->getID();
1306                 $title = $this->mTitle->getPrefixedDBkey();
1307                 $shortTitle = $this->mTitle->getDBkey();
1308
1309                 $adj = $this->mCountAdjustment;
1310
1311                 if ( 0 != $id ) {
1312                         $u = new LinksUpdate( $id, $title );
1313                         array_push( $wgDeferredUpdateList, $u );
1314                         $u = new SiteStatsUpdate( 0, 1, $adj );
1315                         array_push( $wgDeferredUpdateList, $u );
1316                         $u = new SearchUpdate( $id, $title, $text );
1317                         array_push( $wgDeferredUpdateList, $u );
1318
1319                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
1320                         array_push( $wgDeferredUpdateList, $u );
1321
1322                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1323                                 $wgMessageCache->replace( $shortTitle, $text );
1324                         }
1325                 }
1326         }
1327
1328         /* private */ function setOldSubtitle()
1329         {
1330                 global $wgLang, $wgOut;
1331
1332                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
1333                 $r = wfMsg( "revisionasof", $td );
1334                 $wgOut->setSubtitle( "({$r})" );
1335         }
1336
1337         # This function is called right before saving the wikitext,
1338         # so we can do things like signatures and links-in-context.
1339
1340         function preSaveTransform( $text )
1341         {
1342                 global $wgParser, $wgUser;
1343                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
1344         }
1345
1346         /* Caching functions */
1347
1348         # checkLastModified returns true if it has taken care of all
1349         # output to the client that is necessary for this request.
1350         # (that is, it has sent a cached version of the page)
1351         function tryFileCache() {
1352                 static $called = false;
1353                 if( $called ) {
1354                         wfDebug( " tryFileCache() -- called twice!?\n" );
1355                         return;
1356                 }
1357                 $called = true;
1358                 if($this->isFileCacheable()) {
1359                         $touched = $this->mTouched;
1360                         if( $this->mTitle->getPrefixedDBkey() == wfMsg( "mainpage" ) ) {
1361                                 # Expire the main page quicker
1362                                 $expire = wfUnix2Timestamp( time() - 3600 );
1363                                 $touched = max( $expire, $touched );
1364                         }
1365                         $cache = new CacheManager( $this->mTitle );
1366                         if($cache->isFileCacheGood( $touched )) {
1367                                 global $wgOut;
1368                                 wfDebug( " tryFileCache() - about to load\n" );
1369                                 $cache->loadFromFileCache();
1370                                 return true;
1371                         } else {
1372                                 wfDebug( " tryFileCache() - starting buffer\n" );
1373                                 ob_start( array(&$cache, 'saveToFileCache' ) );
1374                         }
1375                 } else {
1376                         wfDebug( " tryFileCache() - not cacheable\n" );
1377                 }
1378         }
1379
1380         function isFileCacheable() {
1381                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
1382                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
1383
1384                 return $wgUseFileCache
1385                         and (!$wgShowIPinHeader)
1386                         and ($this->getID() != 0)
1387                         and ($wgUser->getId() == 0)
1388                         and (!$wgUser->getNewtalk())
1389                         and ($this->mTitle->getNamespace() != Namespace::getSpecial())
1390                         and ($action == "view")
1391                         and (!isset($oldid))
1392                         and (!isset($diff))
1393                         and (!isset($redirect))
1394                         and (!isset($printable))
1395                         and (!$this->mRedirectedFrom);
1396         }
1397
1398         function checkTouched() {
1399                 $id = $this->getID();
1400                 $sql = "SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id=$id";
1401                 $res = wfQuery( $sql, DB_READ, "Article::checkTouched" );
1402                 if( $s = wfFetchObject( $res ) ) {
1403                         $this->mTouched = $s->cur_touched;
1404                         return !$s->cur_is_redirect;
1405                 } else {
1406                         return false;
1407                 }
1408         }
1409
1410         /* static */ function incViewCount( $id )
1411         {
1412                 $id = intval( $id );
1413                 global $wgHitcounterUpdateFreq;
1414
1415                 if( $wgHitcounterUpdateFreq <= 1 ){ //
1416                         wfQuery("UPDATE cur SET cur_counter = cur_counter + 1 " .
1417                                 "WHERE cur_id = $id", DB_WRITE);
1418                         return;
1419                 }
1420
1421                 # Not important enough to warrant an error page in case of failure
1422                 $oldignore = wfIgnoreSQLErrors( true );
1423
1424                 wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);
1425
1426                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
1427                 if( (rand() % $checkfreq != 0) or (wfLastErrno() != 0) ){
1428                         # Most of the time (or on SQL errors), skip row count check
1429                         wfIgnoreSQLErrors( $oldignore );
1430                         return;
1431                 }
1432
1433                 $res = wfQuery("SELECT COUNT(*) as n FROM hitcounter", DB_WRITE);
1434                 $row = wfFetchObject( $res );
1435                 $rown = intval( $row->n );
1436                 if( $rown >= $wgHitcounterUpdateFreq ){
1437                         wfProfileIn( "Article::incViewCount-collect" );
1438                         $old_user_abort = ignore_user_abort( true );
1439
1440                         wfQuery("LOCK TABLES hitcounter WRITE", DB_WRITE);
1441                         wfQuery("CREATE TEMPORARY TABLE acchits TYPE=HEAP ".
1442                                 "SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter ".
1443                                 "GROUP BY hc_id", DB_WRITE);
1444                         wfQuery("DELETE FROM hitcounter", DB_WRITE);
1445                         wfQuery("UNLOCK TABLES", DB_WRITE);
1446                         wfQuery("UPDATE cur,acchits SET cur_counter=cur_counter + hc_n ".
1447                                 "WHERE cur_id = hc_id", DB_WRITE);
1448                         wfQuery("DROP TABLE acchits", DB_WRITE);
1449
1450                         ignore_user_abort( $old_user_abort );
1451                         wfProfileOut( "Article::incViewCount-collect" );
1452                 }
1453                 wfIgnoreSQLErrors( $oldignore );
1454         }
1455
1456         # The onArticle*() functions are supposed to be a kind of hooks
1457         # which should be called whenever any of the specified actions
1458         # are done.
1459         #
1460         # This is a good place to put code to clear caches, for instance.
1461
1462         # This is called on page move and undelete, as well as edit
1463         /* static */ function onArticleCreate($title_obj){
1464                 global $wgEnablePersistentLC, $wgEnableParserCache, $wgUseSquid, $wgDeferredUpdateList;
1465
1466                 $titles = $title_obj->getBrokenLinksTo();
1467
1468                 # Purge squid
1469                 if ( $wgUseSquid ) {
1470                         $urls = $title_obj->getSquidURLs();
1471                         foreach ( $titles as $linkTitle ) {
1472                                 $urls[] = $linkTitle->getInternalURL();
1473                         }
1474                         $u = new SquidUpdate( $urls );
1475                         array_push( $wgDeferredUpdateList, $u );
1476                 }
1477
1478                 # Clear persistent link cache
1479                 if ( $wgEnablePersistentLC ) {
1480                         LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1481                 }
1482
1483                 # Clear parser cache (not really used)
1484                 if ( $wgEnableParserCache ) {
1485                         OutputPage::parsercacheClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
1486                 }
1487         }
1488
1489         /* static */ function onArticleDelete($title_obj){
1490                 global $wgEnablePersistentLC, $wgEnableParserCache;
1491                 if ( $wgEnablePersistentLC ) {
1492                         LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
1493                 }
1494                 if ( $wgEnableParserCache ) {
1495                         OutputPage::parsercacheClearLinksTo( $title_obj->getArticleID() );
1496                 }
1497         }
1498
1499         /* static */ function onArticleEdit($title_obj){
1500                 global $wgEnablePersistentLC, $wgEnableParserCache;
1501                 if ( $wgEnablePersistentLC ) {
1502                         LinkCache::linksccClearPage( $title_obj->getArticleID() );
1503                 }
1504                 if ( $wgEnableParserCache ) {
1505                         OutputPage::parsercacheClearPage( $title_obj->getArticleID(), $title_obj->getNamespace() );
1506                 }
1507         }
1508 }
1509
1510 ?>