includes/Title.php

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