includes/Title.php

   1 <?php
   2 /**
   3  * See title.doc
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 /**
  12  *
  13  */
  14 $wgTitleInterwikiCache = array();
  15 define ( 'GAID_FOR_UPDATE', 1 );
  16
  17 /**
  18  * Title class
  19  * - Represents a title, which may contain an interwiki designation or namespace
  20  * - Can fetch various kinds of data from the database, albeit inefficiently.
  21  *
  22  * @todo migrate comments to phpdoc format
  23  * @package MediaWiki
  24  */
  25 class Title {
  26         # All member variables should be considered private
  27         # Please use the accessor functions
  28
  29         var $mTextform;           # Text form (spaces not underscores) of the main part
  30         var $mUrlform;            # URL-encoded form of the main part
  31         var $mDbkeyform;          # Main part with underscores
  32         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  33         var $mInterwiki;          # Interwiki prefix (or null string)
  34         var $mFragment;           # Title fragment (i.e. the bit after the #)
  35         var $mArticleID;          # Article ID, fetched from the link cache on demand
  36         var $mRestrictions;       # Array of groups allowed to edit this article
  37                               # Only null or "sysop" are supported
  38         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  39         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  40         var $mDefaultNamespace;   # Namespace index when there is no namespace
  41                               # Zero except in {{transclusion}} tags
  42
  43 #----------------------------------------------------------------------------
  44 #   Construction
  45 #----------------------------------------------------------------------------
  46
  47         /* private */ function Title() {
  48                 $this->mInterwiki = $this->mUrlform =
  49                 $this->mTextform = $this->mDbkeyform = '';
  50                 $this->mArticleID = -1;
  51                 $this->mNamespace = 0;
  52                 $this->mRestrictionsLoaded = false;
  53                 $this->mRestrictions = array();
  54         $this->mDefaultNamespace = 0;
  55         }
  56
  57         # From a prefixed DB key
  58         /* static */ function newFromDBkey( $key ) {
  59                 $t = new Title();
  60                 $t->mDbkeyform = $key;
  61                 if( $t->secureAndSplit() )
  62                         return $t;
  63                 else
  64                         return NULL;
  65         }
  66
  67         # From text, such as what you would find in a link
  68         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  69                 $fname = 'Title::newFromText';
  70                 wfProfileIn( $fname );
  71
  72                 if( is_object( $text ) ) {
  73                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  74                 }
  75                 global $wgInputEncoding;
  76                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
  77
  78                 $text = wfMungeToUtf8( $text );
  79
  80
  81                 # What was this for? TS 2004-03-03
  82                 # $text = urldecode( $text );
  83
  84                 $t = new Title();
  85                 $t->mDbkeyform = str_replace( ' ', '_', $text );
  86                 $t->mDefaultNamespace = $defaultNamespace;
  87
  88                 wfProfileOut( $fname );
  89                 if ( !is_object( $t ) ) {
  90                         var_dump( debug_backtrace() );
  91                 }
  92                 if( $t->secureAndSplit() ) {
  93                         return $t;
  94                 } else {
  95                         return NULL;
  96                 }
  97         }
  98
  99         # From a URL-encoded title
 100         /* static */ function newFromURL( $url ) {
 101                 global $wgLang, $wgServer;
 102                 $t = new Title();
 103
 104                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 105                 # but some URLs used it as a space replacement and they still come
 106                 # from some external search tools.
 107                 $s = str_replace( '+', ' ', $url );
 108
 109                 # For links that came from outside, check for alternate/legacy
 110                 # character encoding.
 111                 wfDebug( "Servr: $wgServer\n" );
 112                 if( empty( $_SERVER['HTTP_REFERER'] ) ||
 113                         strncmp($wgServer, $_SERVER['HTTP_REFERER'], strlen( $wgServer ) ) )
 114                 {
 115                         $s = $wgLang->checkTitleEncoding( $s );
 116                 } else {
 117                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 118                 }
 119
 120                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 121                 if( $t->secureAndSplit() ) {
 122                         # check that length of title is < cur_title size
 123                         $dbr =& wfGetDB( DB_SLAVE );
 124                         $maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
 125                         if ( $maxSize != -1 && strlen( $t->mDbkeyform ) > $maxSize ) {
 126                                 return NULL;
 127                         }
 128
 129                         return $t;
 130                 } else {
 131                         return NULL;
 132                 }
 133         }
 134
 135         # From a cur_id
 136         # This is inefficiently implemented, the cur row is requested but not
 137         # used for anything else
 138         /* static */ function newFromID( $id ) {
 139                 $fname = 'Title::newFromID';
 140                 $dbr =& wfGetDB( DB_SLAVE );
 141                 $row = $dbr->getArray( 'cur', array( 'cur_namespace', 'cur_title' ),
 142                         array( 'cur_id' => $id ), $fname );
 143                 if ( $row !== false ) {
 144                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 145                 } else {
 146                         $title = NULL;
 147                 }
 148                 return $title;
 149         }
 150
 151         # From a namespace index and a DB key.
 152         # It's assumed that $ns and $title are *valid*, for instance when
 153         # they came directly from the database or a special page name.
 154         /* static */ function &makeTitle( $ns, $title ) {
 155                 $t =& new Title();
 156                 $t->mInterwiki = '';
 157                 $t->mFragment = '';
 158                 $t->mNamespace = $ns;
 159                 $t->mDbkeyform = $title;
 160                 $t->mArticleID = ( $ns >= 0 ) ? 0 : -1;
 161                 $t->mUrlform = wfUrlencode( $title );
 162                 $t->mTextform = str_replace( '_', ' ', $title );
 163                 return $t;
 164         }
 165
 166         # From a namespace index and a DB key.
 167         # These will be checked for validity, which is a bit slower
 168         # than makeTitle() but safer for user-provided data.
 169         /* static */ function makeTitleSafe( $ns, $title ) {
 170                 $t = new Title();
 171                 $t->mDbkeyform = Title::makeName( $ns, $title );
 172                 if( $t->secureAndSplit() ) {
 173                         return $t;
 174                 } else {
 175                         return NULL;
 176                 }
 177         }
 178
 179         /* static */ function newMainPage() {
 180                 return Title::newFromText( wfMsg( 'mainpage' ) );
 181         }
 182
 183         # Get the title object for a redirect
 184         # Returns NULL if the text is not a valid redirect
 185         /* static */ function newFromRedirect( $text ) {
 186                 global $wgMwRedir;
 187                 $rt = NULL;
 188                 if ( $wgMwRedir->matchStart( $text ) ) {
 189                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 190                                 # categories are escaped using : for example one can enter:
 191                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 192                                 if ( substr($m[1],0,1) == ':') {
 193                                         # We don't want to keep the ':'
 194                                         $m[1] = substr( $m[1], 1 );
 195                                 }
 196
 197                                 $rt = Title::newFromText( $m[1] );
 198                         }
 199                 }
 200                 return $rt;
 201         }
 202
 203 #----------------------------------------------------------------------------
 204 #       Static functions
 205 #----------------------------------------------------------------------------
 206
 207         # Get the prefixed DB key associated with an ID
 208         /* static */ function nameOf( $id ) {
 209                 $fname = 'Title::nameOf';
 210                 $dbr =& wfGetDB( DB_SLAVE );
 211
 212                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 213                 if ( $s === false ) { return NULL; }
 214
 215                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 216                 return $n;
 217         }
 218
 219         # Get a regex character class describing the legal characters in a link
 220         /* static */ function legalChars() {
 221                 # Missing characters:
 222                 #  * []|# Needed for link syntax
 223                 #  * % and + are corrupted by Apache when they appear in the path
 224                 #
 225                 # % seems to work though
 226                 #
 227                 # The problem with % is that URLs are double-unescaped: once by Apache's
 228                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 229                 # Our code does not double-escape to compensate for this, indeed double escaping
 230                 # would break if the double-escaped title was passed in the query string
 231                 # rather than the path. This is a minor security issue because articles can be
 232                 # created such that they are hard to view or edit. -- TS
 233                 #
 234                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 235                 # this breaks interlanguage links
 236
 237                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 238                 return $set;
 239         }
 240
 241         # Returns a stripped-down a title string ready for the search index
 242         # Takes a namespace index and a text-form main part
 243         /* static */ function indexTitle( $ns, $title ) {
 244                 global $wgDBminWordLen, $wgLang;
 245                 require_once( 'SearchEngine.php' );
 246
 247                 $lc = SearchEngine::legalSearchChars() . '&#;';
 248                 $t = $wgLang->stripForSearch( $title );
 249                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 250                 $t = strtolower( $t );
 251
 252                 # Handle 's, s'
 253                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 254                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 255
 256                 $t = preg_replace( "/\\s+/", ' ', $t );
 257
 258                 if ( $ns == Namespace::getImage() ) {
 259                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 260                 }
 261                 return trim( $t );
 262         }
 263
 264         # Make a prefixed DB key from a DB key and a namespace index
 265         /* static */ function makeName( $ns, $title ) {
 266                 global $wgLang;
 267
 268                 $n = $wgLang->getNsText( $ns );
 269                 if ( '' == $n ) { return $title; }
 270                 else { return $n.':'.$title; }
 271         }
 272
 273         # Arguably static
 274         # Returns the URL associated with an interwiki prefix
 275         # The URL contains $1, which is replaced by the title
 276         function getInterwikiLink( $key ) {
 277                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 278                 $fname = 'Title::getInterwikiLink';
 279                 $k = $wgDBname.':interwiki:'.$key;
 280
 281                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 282                         return $wgTitleInterwikiCache[$k]->iw_url;
 283
 284                 $s = $wgMemc->get( $k );
 285                 # Ignore old keys with no iw_local
 286                 if( $s && isset( $s->iw_local ) ) {
 287                         $wgTitleInterwikiCache[$k] = $s;
 288                         return $s->iw_url;
 289                 }
 290                 $dbr =& wfGetDB( DB_SLAVE );
 291                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 292                 if(!$res) return '';
 293
 294                 $s = $dbr->fetchObject( $res );
 295                 if(!$s) {
 296                         # Cache non-existence: create a blank object and save it to memcached
 297                         $s = (object)false;
 298                         $s->iw_url = '';
 299                         $s->iw_local = 0;
 300                 }
 301                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 302                 $wgTitleInterwikiCache[$k] = $s;
 303                 return $s->iw_url;
 304         }
 305
 306         function isLocal() {
 307                 global $wgTitleInterwikiCache, $wgDBname;
 308
 309                 if ( $this->mInterwiki != '' ) {
 310                         # Make sure key is loaded into cache
 311                         $this->getInterwikiLink( $this->mInterwiki );
 312                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 313                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 314                 } else {
 315                         return true;
 316                 }
 317         }
 318
 319         # Update the cur_touched field for an array of title objects
 320         # Inefficient unless the IDs are already loaded into the link cache
 321         /* static */ function touchArray( $titles, $timestamp = '' ) {
 322                 if ( count( $titles ) == 0 ) {
 323                         return;
 324                 }
 325                 if ( $timestamp == '' ) {
 326                         $timestamp = wfTimestampNow();
 327                 }
 328                 $dbw =& wfGetDB( DB_MASTER );
 329                 $cur = $dbw->tableName( 'cur' );
 330                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 331                 $first = true;
 332
 333                 foreach ( $titles as $title ) {
 334                         if ( ! $first ) {
 335                                 $sql .= ',';
 336                         }
 337                         $first = false;
 338                         $sql .= $title->getArticleID();
 339                 }
 340                 $sql .= ')';
 341                 if ( ! $first ) {
 342                         $dbw->query( $sql, 'Title::touchArray' );
 343                 }
 344         }
 345
 346 #----------------------------------------------------------------------------
 347 #       Other stuff
 348 #----------------------------------------------------------------------------
 349
 350         # Simple accessors
 351         # See the definitions at the top of this file
 352
 353         function getText() { return $this->mTextform; }
 354         function getPartialURL() { return $this->mUrlform; }
 355         function getDBkey() { return $this->mDbkeyform; }
 356         function getNamespace() { return $this->mNamespace; }
 357         function setNamespace( $n ) { $this->mNamespace = $n; }
 358         function getInterwiki() { return $this->mInterwiki; }
 359         function getFragment() { return $this->mFragment; }
 360         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 361
 362         # Get title for search index
 363         function getIndexTitle() {
 364                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 365         }
 366
 367         # Get prefixed title with underscores
 368         function getPrefixedDBkey() {
 369                 $s = $this->prefix( $this->mDbkeyform );
 370                 $s = str_replace( ' ', '_', $s );
 371                 return $s;
 372         }
 373
 374         # Get prefixed title with spaces
 375         # This is the form usually used for display
 376         function getPrefixedText() {
 377                 if ( empty( $this->mPrefixedText ) ) {
 378                         $s = $this->prefix( $this->mTextform );
 379                         $s = str_replace( '_', ' ', $s );
 380                         $this->mPrefixedText = $s;
 381                 }
 382                 return $this->mPrefixedText;
 383         }
 384
 385         # As getPrefixedText(), plus fragment.
 386         function getFullText() {
 387                 $text = $this->getPrefixedText();
 388                 if( '' != $this->mFragment ) {
 389                         $text .= '#' . $this->mFragment;
 390                 }
 391                 return $text;
 392         }
 393
 394         # Get a URL-encoded title (not an actual URL) including interwiki
 395         function getPrefixedURL() {
 396                 $s = $this->prefix( $this->mDbkeyform );
 397                 $s = str_replace( ' ', '_', $s );
 398
 399                 $s = wfUrlencode ( $s ) ;
 400
 401                 # Cleaning up URL to make it look nice -- is this safe?
 402                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 403                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 404                 $s = str_replace( '%28', '(', $s );
 405                 $s = str_replace( '%29', ')', $s );
 406
 407                 return $s;
 408         }
 409
 410         # Get a real URL referring to this title, with interwiki link and fragment
 411         function getFullURL( $query = '' ) {
 412                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 413
 414                 if ( '' == $this->mInterwiki ) {
 415                         $p = $wgArticlePath;
 416                         return $wgServer . $this->getLocalUrl( $query );
 417                 } else {
 418                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 419                         $namespace = $wgLang->getNsText( $this->mNamespace );
 420                         if ( '' != $namespace ) {
 421                                 # Can this actually happen? Interwikis shouldn't be parsed.
 422                                 $namepace .= ':';
 423                         }
 424                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 425                         if ( '' != $this->mFragment ) {
 426                                 $url .= '#' . $this->mFragment;
 427                         }
 428                         return $url;
 429                 }
 430         }
 431
 432         # Get a URL with an optional query string, no fragment
 433         # * If $query=="", it will use $wgArticlePath
 434         # * Returns a full for an interwiki link, loses any query string
 435         # * Optionally adds the server and escapes for HTML
 436         # * Setting $query to "-" makes an old-style URL with nothing in the
 437         #   query except a title
 438
 439         function getURL() {
 440                 die( 'Call to obsolete obsolete function Title::getURL()' );
 441         }
 442
 443         function getLocalURL( $query = '' ) {
 444                 global $wgLang, $wgArticlePath, $wgScript;
 445
 446                 if ( $this->isExternal() ) {
 447                         return $this->getFullURL();
 448                 }
 449
 450                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 451                 if ( $query == '' ) {
 452                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 453                 } else {
 454                         if ( $query == '-' ) {
 455                                 $query = '';
 456                         }
 457                         if ( $wgScript != '' ) {
 458                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 459                         } else {
 460                                 # Top level wiki
 461                                 $url = "/{$dbkey}?{$query}";
 462                         }
 463                 }
 464                 return $url;
 465         }
 466
 467         function escapeLocalURL( $query = '' ) {
 468                 return htmlspecialchars( $this->getLocalURL( $query ) );
 469         }
 470
 471         function escapeFullURL( $query = '' ) {
 472                 return htmlspecialchars( $this->getFullURL( $query ) );
 473         }
 474
 475         function getInternalURL( $query = '' ) {
 476                 # Used in various Squid-related code, in case we have a different
 477                 # internal hostname for the server than the exposed one.
 478                 global $wgInternalServer;
 479                 return $wgInternalServer . $this->getLocalURL( $query );
 480         }
 481
 482         # Get the edit URL, or a null string if it is an interwiki link
 483         function getEditURL() {
 484                 global $wgServer, $wgScript;
 485
 486                 if ( '' != $this->mInterwiki ) { return ''; }
 487                 $s = $this->getLocalURL( 'action=edit' );
 488
 489                 return $s;
 490         }
 491
 492         # Get HTML-escaped displayable text
 493         # For the title field in <a> tags
 494         function getEscapedText() {
 495                 return htmlspecialchars( $this->getPrefixedText() );
 496         }
 497
 498         # Is the title interwiki?
 499         function isExternal() { return ( '' != $this->mInterwiki ); }
 500
 501         # Does the title correspond to a protected article?
 502         function isProtected() {
 503                 if ( -1 == $this->mNamespace ) { return true; }
 504                 $a = $this->getRestrictions();
 505                 if ( in_array( 'sysop', $a ) ) { return true; }
 506                 return false;
 507         }
 508
 509         # Is the page a log page, i.e. one where the history is messed up by
 510         # LogPage.php? This used to be used for suppressing diff links in recent
 511         # changes, but now that's done by setting a flag in the recentchanges
 512         # table. Hence, this probably is no longer used.
 513         function isLog() {
 514                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 515                         return false;
 516                 }
 517                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 518                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 519                         return true;
 520                 }
 521                 return false;
 522         }
 523
 524         # Is $wgUser is watching this page?
 525         function userIsWatching() {
 526                 global $wgUser;
 527
 528                 if ( -1 == $this->mNamespace ) { return false; }
 529                 if ( 0 == $wgUser->getID() ) { return false; }
 530
 531                 return $wgUser->isWatched( $this );
 532         }
 533
 534         # Can $wgUser edit this page?
 535         function userCanEdit() {
 536                 global $wgUser;
 537                 if ( -1 == $this->mNamespace ) { return false; }
 538                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 539                 # if ( 0 == $this->getArticleID() ) { return false; }
 540                 if ( $this->mDbkeyform == '_' ) { return false; }
 541                 # protect global styles and js
 542                 if ( NS_MEDIAWIKI == $this->mNamespace
 543                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 544                      && !$wgUser->isSysop() )
 545                 { return false; }
 546                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 547                 # protect css/js subpages of user pages
 548                 # XXX: this might be better using restrictions
 549                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 550                 if( Namespace::getUser() == $this->mNamespace
 551                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 552                         and !$wgUser->isSysop()
 553                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 554                 { return false; }
 555                 $ur = $wgUser->getRights();
 556                 foreach ( $this->getRestrictions() as $r ) {
 557                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 558                                 return false;
 559                         }
 560                 }
 561                 return true;
 562         }
 563
 564         function userCanRead() {
 565                 global $wgUser;
 566                 global $wgWhitelistRead;
 567
 568                 if( 0 != $wgUser->getID() ) return true;
 569                 if( !is_array( $wgWhitelistRead ) ) return true;
 570
 571                 $name = $this->getPrefixedText();
 572                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 573
 574                 # Compatibility with old settings
 575                 if( $this->getNamespace() == NS_MAIN ) {
 576                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 577                 }
 578                 return false;
 579         }
 580
 581         function isCssJsSubpage() {
 582                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 583         }
 584         function isCssSubpage() {
 585                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 586         }
 587         function isJsSubpage() {
 588                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 589         }
 590         function userCanEditCssJsSubpage() {
 591                 # protect css/js subpages of user pages
 592                 # XXX: this might be better using restrictions
 593                 global $wgUser;
 594                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 595         }
 596
 597         # Accessor/initialisation for mRestrictions
 598         function getRestrictions() {
 599                 $id = $this->getArticleID();
 600                 if ( 0 == $id ) { return array(); }
 601
 602                 if ( ! $this->mRestrictionsLoaded ) {
 603                         $dbr =& wfGetDB( DB_SLAVE );
 604                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 605                         $this->mRestrictions = explode( ',', trim( $res ) );
 606                         $this->mRestrictionsLoaded = true;
 607                 }
 608                 return $this->mRestrictions;
 609         }
 610
 611         # Is there a version of this page in the deletion archive?
 612         # Returns the number of archived revisions
 613         function isDeleted() {
 614                 $fname = 'Title::isDeleted';
 615                 $dbr =& wfGetDB( DB_SLAVE );
 616                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 617                         'ar_title' => $this->getDBkey() ), $fname );
 618                 return (int)$n;
 619         }
 620
 621         # Get the article ID from the link cache
 622         # $flags is a bit field, may be GAID_FOR_UPDATE to select for update
 623         function getArticleID( $flags = 0 ) {
 624                 global $wgLinkCache;
 625
 626                 if ( $flags & GAID_FOR_UPDATE ) {
 627                         $oldUpdate = $wgLinkCache->forUpdate( true );
 628                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 629                         $wgLinkCache->forUpdate( $oldUpdate );
 630                 } else {
 631                         if ( -1 == $this->mArticleID ) {
 632                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 633                         }
 634                 }
 635                 return $this->mArticleID;
 636         }
 637
 638         # This clears some fields in this object, and clears any associated keys in the
 639         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 640         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 641         function resetArticleID( $newid ) {
 642                 global $wgLinkCache;
 643                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 644
 645                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 646                 else { $this->mArticleID = $newid; }
 647                 $this->mRestrictionsLoaded = false;
 648                 $this->mRestrictions = array();
 649         }
 650
 651         # Updates cur_touched
 652         # Called from LinksUpdate.php
 653         function invalidateCache() {
 654                 $now = wfTimestampNow();
 655                 $dbw =& wfGetDB( DB_MASTER );
 656                 $success = $dbw->updateArray( 'cur',
 657                         array( /* SET */
 658                                 'cur_touched' => wfTimestampNow()
 659                         ), array( /* WHERE */
 660                                 'cur_namespace' => $this->getNamespace() ,
 661                                 'cur_title' => $this->getDBkey()
 662                         ), 'Title::invalidateCache'
 663                 );
 664                 return $success;
 665         }
 666
 667         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 668         /* private */ function prefix( $name ) {
 669                 global $wgLang;
 670
 671                 $p = '';
 672                 if ( '' != $this->mInterwiki ) {
 673                         $p = $this->mInterwiki . ':';
 674                 }
 675                 if ( 0 != $this->mNamespace ) {
 676                         $p .= $wgLang->getNsText( $this->mNamespace ) . ':';
 677                 }
 678                 return $p . $name;
 679         }
 680
 681         # Secure and split - main initialisation function for this object
 682         #
 683         # Assumes that mDbkeyform has been set, and is urldecoded
 684     # and uses underscores, but not otherwise munged.  This function
 685     # removes illegal characters, splits off the interwiki and
 686     # namespace prefixes, sets the other forms, and canonicalizes
 687     # everything.
 688         #
 689         /* private */ function secureAndSplit()
 690         {
 691                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 692                 $fname = 'Title::secureAndSplit';
 693                 wfProfileIn( $fname );
 694
 695                 static $imgpre = false;
 696                 static $rxTc = false;
 697
 698                 # Initialisation
 699                 if ( $imgpre === false ) {
 700                         $imgpre = ':' . $wgLang->getNsText( Namespace::getImage() ) . ':';
 701                         # % is needed as well
 702                         $rxTc = '/[^' . Title::legalChars() . ']/';
 703                 }
 704
 705                 $this->mInterwiki = $this->mFragment = '';
 706                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 707
 708                 # Clean up whitespace
 709                 #
 710                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 711                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 712
 713                 if ( '' == $t ) {
 714                         wfProfileOut( $fname );
 715                         return false;
 716                 }
 717
 718                 global $wgUseLatin1;
 719                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
 720                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
 721                         wfProfileOut( $fname );
 722                         return false;
 723                 }
 724
 725                 $this->mDbkeyform = $t;
 726                 $done = false;
 727
 728                 # :Image: namespace
 729                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 730                         $t = substr( $t, 1 );
 731                 }
 732
 733                 # Initial colon indicating main namespace
 734                 if ( ':' == $t{0} ) {
 735                         $r = substr( $t, 1 );
 736                         $this->mNamespace = NS_MAIN;
 737                 } else {
 738                         # Namespace or interwiki prefix
 739                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
 740                                 #$p = strtolower( $m[1] );
 741                                 $p = $m[1];
 742                                 $lowerNs = strtolower( $p );
 743                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 744                                         # Canonical namespace
 745                                         $t = $m[2];
 746                                         $this->mNamespace = $ns;
 747                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 748                                         # Ordinary namespace
 749                                         $t = $m[2];
 750                                         $this->mNamespace = $ns;
 751                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 752                                         # Interwiki link
 753                                         $t = $m[2];
 754                                         $this->mInterwiki = $p;
 755
 756                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 757                                                 $done = true;
 758                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 759                                                 $done = true;
 760                                         }
 761                                 }
 762                         }
 763                         $r = $t;
 764                 }
 765
 766                 # Redundant interwiki prefix to the local wiki
 767                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 768                         $this->mInterwiki = '';
 769                 }
 770                 # We already know that some pages won't be in the database!
 771                 #
 772                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
 773                         $this->mArticleID = 0;
 774                 }
 775                 $f = strstr( $r, '#' );
 776                 if ( false !== $f ) {
 777                         $this->mFragment = substr( $f, 1 );
 778                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 779                 }
 780
 781                 # Reject illegal characters.
 782                 #
 783                 if( preg_match( $rxTc, $r ) ) {
 784                         wfProfileOut( $fname );
 785                         return false;
 786                 }
 787
 788                 # "." and ".." conflict with the directories of those namesa
 789                 if ( strpos( $r, '.' ) !== false &&
 790                      ( $r === '.' || $r === '..' ||
 791                        strpos( $r, './' ) === 0  ||
 792                        strpos( $r, '../' ) === 0 ||
 793                        strpos( $r, '/./' ) !== false ||
 794                        strpos( $r, '/../' ) !== false ) )
 795                 {
 796                         wfProfileOut( $fname );
 797                         return false;
 798                 }
 799
 800                 # Initial capital letter
 801                 if( $wgCapitalLinks && $this->mInterwiki == '') {
 802                         $t = $wgLang->ucfirst( $r );
 803                 } else {
 804                         $t = $r;
 805                 }
 806
 807                 # Fill fields
 808                 $this->mDbkeyform = $t;
 809                 $this->mUrlform = wfUrlencode( $t );
 810
 811                 $this->mTextform = str_replace( '_', ' ', $t );
 812
 813                 wfProfileOut( $fname );
 814                 return true;
 815         }
 816
 817         # Get a title object associated with the talk page of this article
 818         function getTalkPage() {
 819                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 820         }
 821
 822         # Get a title object associated with the subject page of this talk page
 823         function getSubjectPage() {
 824                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 825         }
 826
 827         # Get an array of Title objects linking to this title
 828         # Also stores the IDs in the link cache
 829         # $options may be FOR UPDATE
 830         function getLinksTo( $options = '' ) {
 831                 global $wgLinkCache;
 832                 $id = $this->getArticleID();
 833
 834                 if ( $options ) {
 835                         $db =& wfGetDB( DB_MASTER );
 836                 } else {
 837                         $db =& wfGetDB( DB_SLAVE );
 838                 }
 839                 $cur = $db->tableName( 'cur' );
 840                 $links = $db->tableName( 'links' );
 841
 842                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
 843                 $res = $db->query( $sql, 'Title::getLinksTo' );
 844                 $retVal = array();
 845                 if ( $db->numRows( $res ) ) {
 846                         while ( $row = $db->fetchObject( $res ) ) {
 847                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
 848                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 849                                         $retVal[] = $titleObj;
 850                                 }
 851                         }
 852                 }
 853                 $db->freeResult( $res );
 854                 return $retVal;
 855         }
 856
 857         # Get an array of Title objects linking to this non-existent title
 858         # Also stores the IDs in the link cache
 859         function getBrokenLinksTo( $options = '' ) {
 860                 global $wgLinkCache;
 861
 862                 if ( $options ) {
 863                         $db =& wfGetDB( DB_MASTER );
 864                 } else {
 865                         $db =& wfGetDB( DB_SLAVE );
 866                 }
 867                 $cur = $db->tableName( 'cur' );
 868                 $brokenlinks = $db->tableName( 'brokenlinks' );
 869                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
 870
 871                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
 872                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
 873                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
 874                 $retVal = array();
 875                 if ( $db->numRows( $res ) ) {
 876                         while ( $row = $db->fetchObject( $res ) ) {
 877                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 878                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 879                                 $retVal[] = $titleObj;
 880                         }
 881                 }
 882                 $db->freeResult( $res );
 883                 return $retVal;
 884         }
 885
 886         function getSquidURLs() {
 887                 return array(
 888                         $this->getInternalURL(),
 889                         $this->getInternalURL( 'action=history' )
 890                 );
 891         }
 892
 893         function moveNoAuth( &$nt ) {
 894                 return $this->moveTo( $nt, false );
 895         }
 896
 897         # Move a title to a new location
 898         # Returns true on success, message name on failure
 899         # auth indicates whether wgUser's permissions should be checked
 900         function moveTo( &$nt, $auth = true ) {
 901                 if( !$this or !$nt ) {
 902                         return 'badtitletext';
 903                 }
 904
 905                 $fname = 'Title::move';
 906                 $oldid = $this->getArticleID();
 907                 $newid = $nt->getArticleID();
 908
 909                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 910                         return 'articleexists';
 911                 }
 912                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 913                          ( '' == $this->getDBkey() ) ||
 914                          ( '' != $this->getInterwiki() ) ||
 915                          ( !$oldid ) ||
 916                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 917                          ( '' == $nt->getDBkey() ) ||
 918                          ( '' != $nt->getInterwiki() ) ) {
 919                         return 'badarticleerror';
 920                 }
 921
 922                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 923                         return 'protectedpage';
 924                 }
 925
 926                 # The move is allowed only if (1) the target doesn't exist, or
 927                 # (2) the target is a redirect to the source, and has no history
 928                 # (so we can undo bad moves right after they're done).
 929
 930                 if ( 0 != $newid ) { # Target exists; check for validity
 931                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 932                                 return 'articleexists';
 933                         }
 934                         $this->moveOverExistingRedirect( $nt );
 935                 } else { # Target didn't exist, do normal move.
 936                         $this->moveToNewTitle( $nt, $newid );
 937                 }
 938
 939                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
 940
 941                 $dbw =& wfGetDB( DB_MASTER );
 942                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
 943                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
 944                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
 945                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
 946
 947                 # Update watchlists
 948
 949                 $oldnamespace = $this->getNamespace() & ~1;
 950                 $newnamespace = $nt->getNamespace() & ~1;
 951                 $oldtitle = $this->getDBkey();
 952                 $newtitle = $nt->getDBkey();
 953
 954                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
 955                         WatchedItem::duplicateEntries( $this, $nt );
 956                 }
 957
 958                 # Update search engine
 959                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 960                 $u->doUpdate();
 961                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
 962                 $u->doUpdate();
 963
 964                 return true;
 965         }
 966
 967         # Move page to title which is presently a redirect to the source page
 968
 969         /* private */ function moveOverExistingRedirect( &$nt ) {
 970                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 971                 $fname = 'Title::moveOverExistingRedirect';
 972                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
 973
 974         $now = wfTimestampNow();
 975         $won = wfInvertTimestamp( $now );
 976                 $newid = $nt->getArticleID();
 977                 $oldid = $this->getArticleID();
 978                 $dbw =& wfGetDB( DB_MASTER );
 979                 $links = $dbw->tableName( 'links' );
 980
 981                 # Change the name of the target page:
 982                 $dbw->updateArray( 'cur',
 983                         /* SET */ array(
 984                                 'cur_touched' => $now,
 985                                 'cur_namespace' => $nt->getNamespace(),
 986                                 'cur_title' => $nt->getDBkey()
 987                         ),
 988                         /* WHERE */ array( 'cur_id' => $oldid ),
 989                         $fname
 990                 );
 991                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 992
 993                 # Repurpose the old redirect. We don't save it to history since
 994                 # by definition if we've got here it's rather uninteresting.
 995
 996                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
 997                 $dbw->updateArray( 'cur',
 998                         /* SET */ array(
 999                                 'cur_touched' => $now,
1000                                 'cur_timestamp' => $now,
1001                                 'inverse_timestamp' => $won,
1002                                 'cur_namespace' => $this->getNamespace(),
1003                                 'cur_title' => $this->getDBkey(),
1004                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1005                                 'cur_comment' => $comment,
1006                                 'cur_user' => $wgUser->getID(),
1007                                 'cur_minor_edit' => 0,
1008                                 'cur_counter' => 0,
1009                                 'cur_restrictions' => '',
1010                                 'cur_user_text' => $wgUser->getName(),
1011                                 'cur_is_redirect' => 1,
1012                                 'cur_is_new' => 1
1013                         ),
1014                         /* WHERE */ array( 'cur_id' => $newid ),
1015                         $fname
1016                 );
1017
1018                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1019
1020                 # Fix the redundant names for the past revisions of the target page.
1021                 # The redirect should have no old revisions.
1022                 $dbw->updateArray(
1023                         /* table */ 'old',
1024                         /* SET */ array(
1025                                 'old_namespace' => $nt->getNamespace(),
1026                                 'old_title' => $nt->getDBkey(),
1027                         ),
1028                         /* WHERE */ array(
1029                                 'old_namespace' => $this->getNamespace(),
1030                                 'old_title' => $this->getDBkey(),
1031                         ),
1032                         $fname
1033                 );
1034
1035                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1036
1037                 # Swap links
1038
1039                 # Load titles and IDs
1040                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1041                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1042
1043                 # Delete them all
1044                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1045                 $dbw->query( $sql, $fname );
1046
1047                 # Reinsert
1048                 if ( count( $linksToOld ) || count( $linksToNew )) {
1049                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1050                         $first = true;
1051
1052                         # Insert links to old title
1053                         foreach ( $linksToOld as $linkTitle ) {
1054                                 if ( $first ) {
1055                                         $first = false;
1056                                 } else {
1057                                         $sql .= ',';
1058                                 }
1059                                 $id = $linkTitle->getArticleID();
1060                                 $sql .= "($id,$newid)";
1061                         }
1062
1063                         # Insert links to new title
1064                         foreach ( $linksToNew as $linkTitle ) {
1065                                 if ( $first ) {
1066                                         $first = false;
1067                                 } else {
1068                                         $sql .= ',';
1069                                 }
1070                                 $id = $linkTitle->getArticleID();
1071                                 $sql .= "($id, $oldid)";
1072                         }
1073
1074                         $dbw->query( $sql, DB_MASTER, $fname );
1075                 }
1076
1077                 # Now, we record the link from the redirect to the new title.
1078                 # It should have no other outgoing links...
1079                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1080                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1081
1082                 # Clear linkscc
1083                 LinkCache::linksccClearLinksTo( $oldid );
1084                 LinkCache::linksccClearLinksTo( $newid );
1085
1086                 # Purge squid
1087                 if ( $wgUseSquid ) {
1088                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1089                         $u = new SquidUpdate( $urls );
1090                         $u->doUpdate();
1091                 }
1092         }
1093
1094         # Move page to non-existing title.
1095         # Sets $newid to be the new article ID
1096
1097         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1098                 global $wgUser, $wgLinkCache, $wgUseSquid;
1099                 $fname = 'MovePageForm::moveToNewTitle';
1100                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1101
1102                 $now = wfTimestampNow();
1103                 $won = wfInvertTimestamp( $now );
1104                 $newid = $nt->getArticleID();
1105                 $oldid = $this->getArticleID();
1106                 $dbw =& wfGetDB( DB_MASTER );
1107
1108                 # Rename cur entry
1109                 $dbw->updateArray( 'cur',
1110                         /* SET */ array(
1111                                 'cur_touched' => $now,
1112                                 'cur_namespace' => $nt->getNamespace(),
1113                                 'cur_title' => $nt->getDBkey()
1114                         ),
1115                         /* WHERE */ array( 'cur_id' => $oldid ),
1116                         $fname
1117                 );
1118
1119                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1120
1121                 # Insert redirct
1122                 $dbw->insertArray( 'cur', array(
1123                         'cur_namespace' => $this->getNamespace(),
1124                         'cur_title' => $this->getDBkey(),
1125                         'cur_comment' => $comment,
1126                         'cur_user' => $wgUser->getID(),
1127                         'cur_user_text' => $wgUser->getName(),
1128                         'cur_timestamp' => $now,
1129                         'inverse_timestamp' => $won,
1130                         'cur_touched' => $now,
1131                         'cur_is_redirect' => 1,
1132                         'cur_is_new' => 1,
1133                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1134                 );
1135                 $newid = $dbw->insertId();
1136                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1137
1138                 # Rename old entries
1139                 $dbw->updateArray(
1140                         /* table */ 'old',
1141                         /* SET */ array(
1142                                 'old_namespace' => $nt->getNamespace(),
1143                                 'old_title' => $nt->getDBkey()
1144                         ),
1145                         /* WHERE */ array(
1146                                 'old_namespace' => $this->getNamespace(),
1147                                 'old_title' => $this->getDBkey()
1148                         ), $fname
1149                 );
1150
1151                 # Record in RC
1152                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1153
1154                 # Purge squid and linkscc as per article creation
1155                 Article::onArticleCreate( $nt );
1156
1157                 # Any text links to the old title must be reassigned to the redirect
1158                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1159                 LinkCache::linksccClearLinksTo( $oldid );
1160
1161                 # Record the just-created redirect's linking to the page
1162                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1163
1164                 # Non-existent target may have had broken links to it; these must
1165                 # now be removed and made into good links.
1166                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1167                 $update->fixBrokenLinks();
1168
1169                 # Purge old title from squid
1170                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1171                 $titles = $nt->getLinksTo();
1172                 if ( $wgUseSquid ) {
1173                         $urls = $this->getSquidURLs();
1174                         foreach ( $titles as $linkTitle ) {
1175                                 $urls[] = $linkTitle->getInternalURL();
1176                         }
1177                         $u = new SquidUpdate( $urls );
1178                         $u->doUpdate();
1179                 }
1180         }
1181
1182         # Checks if $this can be moved to $nt
1183         # Selects for update, so don't call it unless you mean business
1184         function isValidMoveTarget( $nt ) {
1185                 $fname = 'Title::isValidMoveTarget';
1186                 $dbw =& wfGetDB( DB_MASTER );
1187
1188                 # Is it a redirect?
1189                 $id  = $nt->getArticleID();
1190                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1191                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1192
1193                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1194                         # Not a redirect
1195                         return false;
1196                 }
1197
1198                 # Does the redirect point to the source?
1199                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1200                         $redirTitle = Title::newFromText( $m[1] );
1201                         if( !is_object( $redirTitle ) ||
1202                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1203                                 return false;
1204                         }
1205                 }
1206
1207                 # Does the article have a history?
1208                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1209                         array(
1210                                 'old_namespace' => $nt->getNamespace(),
1211                                 'old_title' => $nt->getDBkey()
1212                         ), $fname, 'FOR UPDATE'
1213                 );
1214
1215                 # Return true if there was no history
1216                 return $row === false;
1217         }
1218
1219         # Create a redirect, fails if the title already exists, does not notify RC
1220         # Returns success
1221         function createRedirect( $dest, $comment ) {
1222                 global $wgUser;
1223                 if ( $this->getArticleID() ) {
1224                         return false;
1225                 }
1226
1227                 $fname = 'Title::createRedirect';
1228                 $dbw =& wfGetDB( DB_MASTER );
1229                 $now = wfTimestampNow();
1230                 $won = wfInvertTimestamp( $now );
1231                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1232
1233                 $dbw->insertArray( 'cur', array(
1234                         'cur_id' => $seqVal,
1235                         'cur_namespace' => $this->getNamespace(),
1236                         'cur_title' => $this->getDBkey(),
1237                         'cur_comment' => $comment,
1238                         'cur_user' => $wgUser->getID(),
1239                         'cur_user_text' => $wgUser->getName(),
1240                         'cur_timestamp' => $now,
1241                         'inverse_timestamp' => $won,
1242                         'cur_touched' => $now,
1243                         'cur_is_redirect' => 1,
1244                         'cur_is_new' => 1,
1245                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1246                 ), $fname );
1247                 $newid = $dbw->insertId();
1248                 $this->resetArticleID( $newid );
1249
1250                 # Link table
1251                 if ( $dest->getArticleID() ) {
1252                         $dbw->insertArray( 'links',
1253                                 array(
1254                                         'l_to' => $dest->getArticleID(),
1255                                         'l_from' => $newid
1256                                 ), $fname
1257                         );
1258                 } else {
1259                         $dbw->insertArray( 'brokenlinks',
1260                                 array(
1261                                         'bl_to' => $dest->getPrefixedDBkey(),
1262                                         'bl_from' => $newid
1263                                 ), $fname
1264                         );
1265                 }
1266
1267                 Article::onArticleCreate( $this );
1268                 return true;
1269         }
1270
1271         # Get categories to wich belong this title and return an array of
1272         # categories names.
1273         # Return an array of parents in the form:
1274         #  $parent => $currentarticle
1275         function getParentCategories() {
1276                 global $wgLang,$wgUser;
1277
1278                 $titlekey = $this->getArticleId();
1279                 $sk =& $wgUser->getSkin();
1280                 $parents = array();
1281                 $dbr =& wfGetDB( DB_SLAVE );
1282                 $cur = $dbr->tableName( 'cur' );
1283                 $categorylinks = $dbr->tableName( 'categorylinks' );
1284
1285                 # NEW SQL
1286                 $sql = "SELECT * FROM categorylinks"
1287                      ." WHERE cl_from='$titlekey'"
1288                          ." AND cl_from <> '0'"
1289                          ." ORDER BY cl_sortkey";
1290
1291                 $res = $dbr->query ( $sql ) ;
1292
1293                 if($dbr->numRows($res) > 0) {
1294                         while ( $x = $dbr->fetchObject ( $res ) )
1295                                 //$data[] = Title::newFromText($wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1296                                 $data[$wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1297                         $dbr->freeResult ( $res ) ;
1298                 } else {
1299                         $data = '';
1300                 }
1301                 return $data;
1302         }
1303
1304         # Go through all parents
1305         function getCategorieBrowser() {
1306                 $parents = $this->getParentCategories();
1307
1308                 if($parents != '') {
1309                         foreach($parents as $parent => $current)
1310                         {
1311                                 $nt = Title::newFromText($parent);
1312                                 $stack[$parent] = $nt->getCategorieBrowser();
1313                         }
1314                         return $stack;
1315                 } else {
1316                         return array();
1317                 }
1318         }
1319
1320
1321         # Returns an associative array for selecting this title from cur
1322         function curCond() {
1323                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1324         }
1325
1326         function oldCond() {
1327                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1328         }
1329 }
1330 ?>