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 $wgTitleInterwikiCache = array();
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mRestrictions;       # Array of groups allowed to edit this article
  46                               # Only null or "sysop" are supported
  47         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  48         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  49         var $mDefaultNamespace;   # Namespace index when there is no namespace
  50                               # Zero except in {{transclusion}} tags
  51         /**#@-*/
  52
  53
  54         /**
  55          * Constructor
  56          * @access private
  57          */
  58         /* private */ function Title() {
  59                 $this->mInterwiki = $this->mUrlform =
  60                 $this->mTextform = $this->mDbkeyform = '';
  61                 $this->mArticleID = -1;
  62                 $this->mNamespace = NS_MAIN;
  63                 $this->mRestrictionsLoaded = false;
  64                 $this->mRestrictions = array();
  65                 # Dont change the following, NS_MAIN is hardcoded in several place
  66                 # See bug #696
  67                 $this->mDefaultNamespace = NS_MAIN;
  68         }
  69
  70         /**
  71          * Create a new Title from a prefixed DB key
  72          * @param string $key The database key, which has underscores
  73          *      instead of spaces, possibly including namespace and
  74          *      interwiki prefixes
  75          * @return Title the new object, or NULL on an error
  76          * @static
  77          * @access public
  78          */
  79         /* static */ function newFromDBkey( $key ) {
  80                 $t = new Title();
  81                 $t->mDbkeyform = $key;
  82                 if( $t->secureAndSplit() )
  83                         return $t;
  84                 else
  85                         return NULL;
  86         }
  87
  88         /**
  89          * Create a new Title from text, such as what one would
  90          * find in a link. Decodes any HTML entities in the text.
  91          *
  92          * @param string $text the link text; spaces, prefixes,
  93          *      and an initial ':' indicating the main namespace
  94          *      are accepted
  95          * @param int $defaultNamespace the namespace to use if
  96          *      none is specified by a prefix
  97          * @return Title the new object, or NULL on an error
  98          * @static
  99          * @access public
 100          */
 101         function &newFromText( $text, $defaultNamespace = NS_MAIN ) {
 102                 $fname = 'Title::newFromText';
 103                 wfProfileIn( $fname );
 104
 105                 if( is_object( $text ) ) {
 106                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 107                 }
 108
 109                 /**
 110                  * Wiki pages often contain multiple links to the same page.
 111                  * Title normalization and parsing can become expensive on
 112                  * pages with many links, so we can save a little time by
 113                  * caching them.
 114                  *
 115                  * In theory these are value objects and won't get changed...
 116                  */
 117                 static $titleCache = array();
 118                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 119                         wfProfileOut( $fname );
 120                         return $titleCache[$text];
 121                 }
 122
 123                 /**
 124                  * Convert things like &eacute; into real text...
 125                  */
 126                 global $wgInputEncoding;
 127                 $filteredText = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 128
 129                 /**
 130                  * Convert things like &#257; or &#x3017; into real text...
 131                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 132                  */
 133                 $filteredText = wfMungeToUtf8( $filteredText );
 134
 135                 # What was this for? TS 2004-03-03
 136                 # $text = urldecode( $text );
 137
 138                 $t =& new Title();
 139                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 140                 $t->mDefaultNamespace = $defaultNamespace;
 141
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         $titleCache = array();
 147                                 }
 148                                 $titleCache[$text] =& $t;
 149                         }
 150                         wfProfileOut( $fname );
 151                         return $t;
 152                 } else {
 153                         wfProfileOut( $fname );
 154                         return NULL;
 155                 }
 156         }
 157
 158         /**
 159          * Create a new Title from URL-encoded text. Ensures that
 160          * the given title's length does not exceed the maximum.
 161          * @param string $url the title, as might be taken from a URL
 162          * @return Title the new object, or NULL on an error
 163          * @static
 164          * @access public
 165          */
 166         /* static */ function newFromURL( $url ) {
 167                 global $wgLang, $wgServer;
 168                 $t = new Title();
 169
 170                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 171                 # but some URLs used it as a space replacement and they still come
 172                 # from some external search tools.
 173                 $s = str_replace( '+', ' ', $url );
 174
 175                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 176                 if( $t->secureAndSplit() ) {
 177                         return $t;
 178                 } else {
 179                         return NULL;
 180                 }
 181         }
 182
 183         /**
 184          * Create a new Title from an article ID
 185          * @todo This is inefficiently implemented, the page row is requested
 186          * but not used for anything else
 187          * @param int $id the page_id corresponding to the Title to create
 188          * @return Title the new object, or NULL on an error
 189          * @access public
 190          */
 191         /* static */ function newFromID( $id ) {
 192                 $fname = 'Title::newFromID';
 193                 $dbr =& wfGetDB( DB_SLAVE );
 194                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 195                         array( 'page_id' => $id ), $fname );
 196                 if ( $row !== false ) {
 197                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 198                 } else {
 199                         $title = NULL;
 200                 }
 201                 return $title;
 202         }
 203
 204         /**
 205          * Create a new Title from a namespace index and a DB key.
 206          * It's assumed that $ns and $title are *valid*, for instance when
 207          * they came directly from the database or a special page name.
 208          * For convenience, spaces are converted to underscores so that
 209          * eg user_text fields can be used directly.
 210          *
 211          * @param int $ns the namespace of the article
 212          * @param string $title the unprefixed database key form
 213          * @return Title the new object
 214          * @static
 215          * @access public
 216          */
 217         /* static */ function &makeTitle( $ns, $title ) {
 218                 $t =& new Title();
 219                 $t->mInterwiki = '';
 220                 $t->mFragment = '';
 221                 $t->mNamespace = IntVal( $ns );
 222                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 223                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 224                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 225                 $t->mTextform = str_replace( '_', ' ', $title );
 226                 return $t;
 227         }
 228
 229         /**
 230          * Create a new Title frrom a namespace index and a DB key.
 231          * The parameters will be checked for validity, which is a bit slower
 232          * than makeTitle() but safer for user-provided data.
 233          * @param int $ns the namespace of the article
 234          * @param string $title the database key form
 235          * @return Title the new object, or NULL on an error
 236          * @static
 237          * @access public
 238          */
 239         /* static */ function makeTitleSafe( $ns, $title ) {
 240                 $t = new Title();
 241                 $t->mDbkeyform = Title::makeName( $ns, $title );
 242                 if( $t->secureAndSplit() ) {
 243                         return $t;
 244                 } else {
 245                         return NULL;
 246                 }
 247         }
 248
 249         /**
 250          * Create a new Title for the Main Page
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         /* static */ function newMainPage() {
 256                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 257         }
 258
 259         /**
 260          * Create a new Title for a redirect
 261          * @param string $text the redirect title text
 262          * @return Title the new object, or NULL if the text is not a
 263          *      valid redirect
 264          * @static
 265          * @access public
 266          */
 267         /* static */ function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 272                                 # categories are escaped using : for example one can enter:
 273                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 274                                 if ( substr($m[1],0,1) == ':') {
 275                                         # We don't want to keep the ':'
 276                                         $m[1] = substr( $m[1], 1 );
 277                                 }
 278
 279                                 $rt = Title::newFromText( $m[1] );
 280                                 # Disallow redirects to Special:Userlogout
 281                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 282                                         $rt = NULL;
 283                                 }
 284                         }
 285                 }
 286                 return $rt;
 287         }
 288
 289 #----------------------------------------------------------------------------
 290 #       Static functions
 291 #----------------------------------------------------------------------------
 292
 293         /**
 294          * Get the prefixed DB key associated with an ID
 295          * @param int $id the page_id of the article
 296          * @return Title an object representing the article, or NULL
 297          *      if no such article was found
 298          * @static
 299          * @access public
 300          */
 301         /* static */ function nameOf( $id ) {
 302                 $fname = 'Title::nameOf';
 303                 $dbr =& wfGetDB( DB_SLAVE );
 304
 305                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 306                 if ( $s === false ) { return NULL; }
 307
 308                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 309                 return $n;
 310         }
 311
 312         /**
 313          * Get a regex character class describing the legal characters in a link
 314          * @return string the list of characters, not delimited
 315          * @static
 316          * @access public
 317          */
 318         /* static */ function legalChars() {
 319                 # Missing characters:
 320                 #  * []|# Needed for link syntax
 321                 #  * % and + are corrupted by Apache when they appear in the path
 322                 #
 323                 # % seems to work though
 324                 #
 325                 # The problem with % is that URLs are double-unescaped: once by Apache's
 326                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 327                 # Our code does not double-escape to compensate for this, indeed double escaping
 328                 # would break if the double-escaped title was passed in the query string
 329                 # rather than the path. This is a minor security issue because articles can be
 330                 # created such that they are hard to view or edit. -- TS
 331                 #
 332                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 333                 # this breaks interlanguage links
 334
 335                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 336                 return $set;
 337         }
 338
 339         /**
 340          * Get a string representation of a title suitable for
 341          * including in a search index
 342          *
 343          * @param int $ns a namespace index
 344          * @param string $title text-form main part
 345          * @return string a stripped-down title string ready for the
 346          *      search index
 347          */
 348         /* static */ function indexTitle( $ns, $title ) {
 349                 global $wgDBminWordLen, $wgContLang;
 350                 require_once( 'SearchEngine.php' );
 351
 352                 $lc = SearchEngine::legalSearchChars() . '&#;';
 353                 $t = $wgContLang->stripForSearch( $title );
 354                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 355                 $t = strtolower( $t );
 356
 357                 # Handle 's, s'
 358                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 359                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 360
 361                 $t = preg_replace( "/\\s+/", ' ', $t );
 362
 363                 if ( $ns == NS_IMAGE ) {
 364                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 365                 }
 366                 return trim( $t );
 367         }
 368
 369         /*
 370          * Make a prefixed DB key from a DB key and a namespace index
 371          * @param int $ns numerical representation of the namespace
 372          * @param string $title the DB key form the title
 373          * @return string the prefixed form of the title
 374          */
 375         /* static */ function makeName( $ns, $title ) {
 376                 global $wgContLang;
 377
 378                 $n = $wgContLang->getNsText( $ns );
 379                 if ( '' == $n ) { return $title; }
 380                 else { return $n.':'.$title; }
 381         }
 382
 383         /**
 384          * Returns the URL associated with an interwiki prefix
 385          * @param string $key the interwiki prefix (e.g. "MeatBall")
 386          * @return the associated URL, containing "$1", which should be
 387          *      replaced by an article title
 388          * @static (arguably)
 389          * @access public
 390          */
 391         function getInterwikiLink( $key ) {
 392                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 393                 $fname = 'Title::getInterwikiLink';
 394
 395                 wfProfileIn( $fname );
 396
 397                 $k = $wgDBname.':interwiki:'.$key;
 398                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 399                         wfProfileOut( $fname );
 400                         return $wgTitleInterwikiCache[$k]->iw_url;
 401                 }
 402
 403                 $s = $wgMemc->get( $k );
 404                 # Ignore old keys with no iw_local
 405                 if( $s && isset( $s->iw_local ) ) {
 406                         $wgTitleInterwikiCache[$k] = $s;
 407                         wfProfileOut( $fname );
 408                         return $s->iw_url;
 409                 }
 410
 411                 $dbr =& wfGetDB( DB_SLAVE );
 412                 $res = $dbr->select( 'interwiki',
 413                         array( 'iw_url', 'iw_local' ),
 414                         array( 'iw_prefix' => $key ), $fname );
 415                 if( !$res ) {
 416                         wfProfileOut( $fname );
 417                         return '';
 418                 }
 419
 420                 $s = $dbr->fetchObject( $res );
 421                 if( !$s ) {
 422                         # Cache non-existence: create a blank object and save it to memcached
 423                         $s = (object)false;
 424                         $s->iw_url = '';
 425                         $s->iw_local = 0;
 426                 }
 427                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 428                 $wgTitleInterwikiCache[$k] = $s;
 429
 430                 wfProfileOut( $fname );
 431                 return $s->iw_url;
 432         }
 433
 434         /**
 435          * Determine whether the object refers to a page within
 436          * this project.
 437          *
 438          * @return bool TRUE if this is an in-project interwiki link
 439          *      or a wikilink, FALSE otherwise
 440          * @access public
 441          */
 442         function isLocal() {
 443                 global $wgTitleInterwikiCache, $wgDBname;
 444
 445                 if ( $this->mInterwiki != '' ) {
 446                         # Make sure key is loaded into cache
 447                         $this->getInterwikiLink( $this->mInterwiki );
 448                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 449                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 450                 } else {
 451                         return true;
 452                 }
 453         }
 454
 455         /**
 456          * Update the page_touched field for an array of title objects
 457          * @todo Inefficient unless the IDs are already loaded into the
 458          *      link cache
 459          * @param array $titles an array of Title objects to be touched
 460          * @param string $timestamp the timestamp to use instead of the
 461          *      default current time
 462          * @static
 463          * @access public
 464          */
 465         /* static */ function touchArray( $titles, $timestamp = '' ) {
 466                 if ( count( $titles ) == 0 ) {
 467                         return;
 468                 }
 469                 $dbw =& wfGetDB( DB_MASTER );
 470                 if ( $timestamp == '' ) {
 471                         $timestamp = $dbw->timestamp();
 472                 }
 473                 $page = $dbw->tableName( 'page' );
 474                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 475                 $first = true;
 476
 477                 foreach ( $titles as $title ) {
 478                         if ( ! $first ) {
 479                                 $sql .= ',';
 480                         }
 481                         $first = false;
 482                         $sql .= $title->getArticleID();
 483                 }
 484                 $sql .= ')';
 485                 if ( ! $first ) {
 486                         $dbw->query( $sql, 'Title::touchArray' );
 487                 }
 488         }
 489
 490 #----------------------------------------------------------------------------
 491 #       Other stuff
 492 #----------------------------------------------------------------------------
 493
 494         /** Simple accessors */
 495         /**
 496          * Get the text form (spaces not underscores) of the main part
 497          * @return string
 498          * @access public
 499          */
 500         function getText() { return $this->mTextform; }
 501         /**
 502          * Get the URL-encoded form of the main part
 503          * @return string
 504          * @access public
 505          */
 506         function getPartialURL() { return $this->mUrlform; }
 507         /**
 508          * Get the main part with underscores
 509          * @return string
 510          * @access public
 511          */
 512         function getDBkey() { return $this->mDbkeyform; }
 513         /**
 514          * Get the namespace index, i.e. one of the NS_xxxx constants
 515          * @return int
 516          * @access public
 517          */
 518         function getNamespace() { return $this->mNamespace; }
 519         /**
 520          * Get the interwiki prefix (or null string)
 521          * @return string
 522          * @access public
 523          */
 524         function getInterwiki() { return $this->mInterwiki; }
 525         /**
 526          * Get the Title fragment (i.e. the bit after the #)
 527          * @return string
 528          * @access public
 529          */
 530         function getFragment() { return $this->mFragment; }
 531         /**
 532          * Get the default namespace index, for when there is no namespace
 533          * @return int
 534          * @access public
 535          */
 536         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 537
 538         /**
 539          * Get title for search index
 540          * @return string a stripped-down title string ready for the
 541          *      search index
 542          */
 543         function getIndexTitle() {
 544                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 545         }
 546
 547         /**
 548          * Get the prefixed database key form
 549          * @return string the prefixed title, with underscores and
 550          *      any interwiki and namespace prefixes
 551          * @access public
 552          */
 553         function getPrefixedDBkey() {
 554                 $s = $this->prefix( $this->mDbkeyform );
 555                 $s = str_replace( ' ', '_', $s );
 556                 return $s;
 557         }
 558
 559         /**
 560          * Get the prefixed title with spaces.
 561          * This is the form usually used for display
 562          * @return string the prefixed title, with spaces
 563          * @access public
 564          */
 565         function getPrefixedText() {
 566                 global $wgContLang;
 567                 if ( empty( $this->mPrefixedText ) ) {
 568                         $s = $this->prefix( $this->mTextform );
 569                         $s = str_replace( '_', ' ', $s );
 570                         $this->mPrefixedText = $s;
 571                 }
 572                 return $this->mPrefixedText;
 573         }
 574
 575         /**
 576          * Get the prefixed title with spaces, plus any fragment
 577          * (part beginning with '#')
 578          * @return string the prefixed title, with spaces and
 579          *      the fragment, including '#'
 580          * @access public
 581          */
 582         function getFullText() {
 583                 global $wgContLang;
 584                 $text = $this->getPrefixedText();
 585                 if( '' != $this->mFragment ) {
 586                         $text .= '#' . $this->mFragment;
 587                 }
 588                 return $text;
 589         }
 590
 591         /**
 592          * Get a URL-encoded title (not an actual URL) including interwiki
 593          * @return string the URL-encoded form
 594          * @access public
 595          */
 596         function getPrefixedURL() {
 597                 $s = $this->prefix( $this->mDbkeyform );
 598                 $s = str_replace( ' ', '_', $s );
 599
 600                 $s = wfUrlencode ( $s ) ;
 601
 602                 # Cleaning up URL to make it look nice -- is this safe?
 603                 $s = str_replace( '%28', '(', $s );
 604                 $s = str_replace( '%29', ')', $s );
 605
 606                 return $s;
 607         }
 608
 609         /**
 610          * Get a real URL referring to this title, with interwiki link and
 611          * fragment
 612          *
 613          * @param string $query an optional query string, not used
 614          *      for interwiki links
 615          * @return string the URL
 616          * @access public
 617          */
 618         function getFullURL( $query = '' ) {
 619                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 620
 621                 if ( '' == $this->mInterwiki ) {
 622                         $p = $wgArticlePath;
 623                         return $wgServer . $this->getLocalUrl( $query );
 624                 } else {
 625                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 626                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 627                         if ( '' != $namespace ) {
 628                                 # Can this actually happen? Interwikis shouldn't be parsed.
 629                                 $namepace .= ':';
 630                         }
 631                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 632                         if ( '' != $this->mFragment ) {
 633                                 $url .= '#' . $this->mFragment;
 634                         }
 635                         return $url;
 636                 }
 637         }
 638
 639         /**
 640          * Get a URL with no fragment or server name
 641          * @param string $query an optional query string; if not specified,
 642          *      $wgArticlePath will be used.
 643          * @return string the URL
 644          * @access public
 645          */
 646         function getLocalURL( $query = '' ) {
 647                 global $wgLang, $wgArticlePath, $wgScript;
 648
 649                 if ( $this->isExternal() ) {
 650                         return $this->getFullURL();
 651                 }
 652
 653                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 654                 if ( $query == '' ) {
 655                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 656                 } else {
 657                         if ( $query == '-' ) {
 658                                 $query = '';
 659                         }
 660                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 661                 }
 662                 return $url;
 663         }
 664
 665         /**
 666          * Get an HTML-escaped version of the URL form, suitable for
 667          * using in a link, without a server name or fragment
 668          * @param string $query an optional query string
 669          * @return string the URL
 670          * @access public
 671          */
 672         function escapeLocalURL( $query = '' ) {
 673                 return htmlspecialchars( $this->getLocalURL( $query ) );
 674         }
 675
 676         /**
 677          * Get an HTML-escaped version of the URL form, suitable for
 678          * using in a link, including the server name and fragment
 679          *
 680          * @return string the URL
 681          * @param string $query an optional query string
 682          * @access public
 683          */
 684         function escapeFullURL( $query = '' ) {
 685                 return htmlspecialchars( $this->getFullURL( $query ) );
 686         }
 687
 688         /**
 689          * Get the URL form for an internal link.
 690          * - Used in various Squid-related code, in case we have a different
 691          * internal hostname for the server from the exposed one.
 692          *
 693          * @param string $query an optional query string
 694          * @return string the URL
 695          * @access public
 696          */
 697         function getInternalURL( $query = '' ) {
 698                 global $wgInternalServer;
 699                 return $wgInternalServer . $this->getLocalURL( $query );
 700         }
 701
 702         /**
 703          * Get the edit URL for this Title
 704          * @return string the URL, or a null string if this is an
 705          *      interwiki link
 706          * @access public
 707          */
 708         function getEditURL() {
 709                 global $wgServer, $wgScript;
 710
 711                 if ( '' != $this->mInterwiki ) { return ''; }
 712                 $s = $this->getLocalURL( 'action=edit' );
 713
 714                 return $s;
 715         }
 716
 717         /**
 718          * Get the HTML-escaped displayable text form.
 719          * Used for the title field in <a> tags.
 720          * @return string the text, including any prefixes
 721          * @access public
 722          */
 723         function getEscapedText() {
 724                 return htmlspecialchars( $this->getPrefixedText() );
 725         }
 726
 727         /**
 728          * Is this Title interwiki?
 729          * @return boolean
 730          * @access public
 731          */
 732         function isExternal() { return ( '' != $this->mInterwiki ); }
 733
 734         /**
 735          * Does the title correspond to a protected article?
 736          * @param string $what the action the page is protected from,
 737          *      by default checks move and edit
 738          * @return boolean
 739          * @access public
 740          */
 741         function isProtected($action = '') {
 742                 if ( -1 == $this->mNamespace ) { return true; }
 743                 if($action == 'edit' || $action == '') {
 744                         $a = $this->getRestrictions("edit");
 745                         if ( in_array( 'sysop', $a ) ) { return true; }
 746                 }
 747                 if($action == 'move' || $action == '') {
 748                         $a = $this->getRestrictions("move");
 749                         if ( in_array( 'sysop', $a ) ) { return true; }
 750                 }
 751                 return false;
 752         }
 753
 754         /**
 755          * Is $wgUser is watching this page?
 756          * @return boolean
 757          * @access public
 758          */
 759         function userIsWatching() {
 760                 global $wgUser;
 761
 762                 if ( -1 == $this->mNamespace ) { return false; }
 763                 if ( 0 == $wgUser->getID() ) { return false; }
 764
 765                 return $wgUser->isWatched( $this );
 766         }
 767
 768         /**
 769          * Is $wgUser perform $action this page?
 770          * @param string $action action that permission needs to be checked for
 771          * @return boolean
 772          * @access private
 773          */
 774         function userCan($action) {
 775                 $fname = 'Title::userCanEdit';
 776                 wfProfileIn( $fname );
 777
 778                 global $wgUser;
 779                 if( NS_SPECIAL == $this->mNamespace ) {
 780                         wfProfileOut( $fname );
 781                         return false;
 782                 }
 783                 if( NS_MEDIAWIKI == $this->mNamespace &&
 784                     !$wgUser->isAllowed('editinterface') ) {
 785                         wfProfileOut( $fname );
 786                         return false;
 787                 }
 788                 if( $this->mDbkeyform == '_' ) {
 789                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 790                         wfProfileOut( $fname );
 791                         return false;
 792                 }
 793
 794                 # protect global styles and js
 795                 if ( NS_MEDIAWIKI == $this->mNamespace
 796                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 797                      && !$wgUser->isAllowed('editinterface') ) {
 798                         wfProfileOut( $fname );
 799                         return false;
 800                 }
 801
 802                 # protect css/js subpages of user pages
 803                 # XXX: this might be better using restrictions
 804                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 805                 if( NS_USER == $this->mNamespace
 806                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 807                         && !$wgUser->isAllowed('editinterface')
 808                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 809                         wfProfileOut( $fname );
 810                         return false;
 811                 }
 812
 813                 foreach( $this->getRestrictions($action) as $right ) {
 814                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 815                                 wfProfileOut( $fname );
 816                                 return false;
 817                         }
 818                 }
 819                 wfProfileOut( $fname );
 820                 return true;
 821         }
 822
 823         /**
 824          * Can $wgUser edit this page?
 825          * @return boolean
 826          * @access public
 827          */
 828         function userCanEdit() {
 829                 return $this->userCan('edit');
 830         }
 831
 832         /**
 833          * Can $wgUser move this page?
 834          * @return boolean
 835          * @access public
 836          */
 837         function userCanMove() {
 838                 return $this->userCan('move');
 839         }
 840
 841         /**
 842          * Can $wgUser read this page?
 843          * @return boolean
 844          * @access public
 845          */
 846         function userCanRead() {
 847                 global $wgUser;
 848
 849                 if( $wgUser->isAllowed('read') ) {
 850                         return true;
 851                 } else {
 852                         global $wgWhitelistRead;
 853
 854                         /** If anon users can create an account,
 855                             they need to reach the login page first! */
 856                         if( $wgUser->isAllowed( 'createaccount' )
 857                             && $this->mId == NS_SPECIAL
 858                             && $this->getText() == 'Userlogin' ) {
 859                                 return true;
 860                         }
 861
 862                         /** some pages are explicitly allowed */
 863                         $name = $this->getPrefixedText();
 864                         if( in_array( $name, $wgWhitelistRead ) ) {
 865                                 return true;
 866                         }
 867
 868                         # Compatibility with old settings
 869                         if( $this->getNamespace() == NS_MAIN ) {
 870                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 871                                         return true;
 872                                 }
 873                         }
 874                 }
 875                 return false;
 876         }
 877
 878         /**
 879          * Is this a talk page of some sort?
 880          * @return bool
 881          * @access public
 882          */
 883         function isTalkPage() {
 884                 return Namespace::isTalk( $this->getNamespace() );
 885         }
 886
 887         /**
 888          * Is this a .css or .js subpage of a user page?
 889          * @return bool
 890          * @access public
 891          */
 892         function isCssJsSubpage() {
 893                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 894         }
 895         /**
 896          * Is this a .css subpage of a user page?
 897          * @return bool
 898          * @access public
 899          */
 900         function isCssSubpage() {
 901                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 902         }
 903         /**
 904          * Is this a .js subpage of a user page?
 905          * @return bool
 906          * @access public
 907          */
 908         function isJsSubpage() {
 909                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 910         }
 911         /**
 912          * Protect css/js subpages of user pages: can $wgUser edit
 913          * this page?
 914          *
 915          * @return boolean
 916          * @todo XXX: this might be better using restrictions
 917          * @access public
 918          */
 919         function userCanEditCssJsSubpage() {
 920                 global $wgUser;
 921                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 922         }
 923
 924         /**
 925          * Loads a string into mRestrictions array
 926          * @param string $res restrictions in string format
 927          * @access public
 928          */
 929         function loadRestrictions( $res ) {
 930                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 931                         $temp = explode( '=', trim( $restrict ) );
 932                         if(count($temp) == 1) {
 933                                 // old format should be treated as edit/move restriction
 934                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
 935                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
 936                         } else {
 937                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 938                         }
 939                 }
 940                 $this->mRestrictionsLoaded = true;
 941         }
 942
 943         /**
 944          * Accessor/initialisation for mRestrictions
 945          * @param string $action action that permission needs to be checked for
 946          * @return array the array of groups allowed to edit this article
 947          * @access public
 948          */
 949         function getRestrictions($action) {
 950                 $id = $this->getArticleID();
 951                 if ( 0 == $id ) { return array(); }
 952
 953                 if ( ! $this->mRestrictionsLoaded ) {
 954                         $dbr =& wfGetDB( DB_SLAVE );
 955                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
 956                         $this->loadRestrictions( $res );
 957                 }
 958                 if( isset( $this->mRestrictions[$action] ) ) {
 959                         return $this->mRestrictions[$action];
 960                 }
 961                 return array();
 962         }
 963
 964         /**
 965          * Is there a version of this page in the deletion archive?
 966          * @return int the number of archived revisions
 967          * @access public
 968          */
 969         function isDeleted() {
 970                 $fname = 'Title::isDeleted';
 971                 $dbr =& wfGetDB( DB_SLAVE );
 972                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 973                         'ar_title' => $this->getDBkey() ), $fname );
 974                 return (int)$n;
 975         }
 976
 977         /**
 978          * Get the article ID for this Title from the link cache,
 979          * adding it if necessary
 980          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 981          *      for update
 982          * @return int the ID
 983          * @access public
 984          */
 985         function getArticleID( $flags = 0 ) {
 986                 global $wgLinkCache;
 987
 988                 if ( $flags & GAID_FOR_UPDATE ) {
 989                         $oldUpdate = $wgLinkCache->forUpdate( true );
 990                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 991                         $wgLinkCache->forUpdate( $oldUpdate );
 992                 } else {
 993                         if ( -1 == $this->mArticleID ) {
 994                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 995                         }
 996                 }
 997                 return $this->mArticleID;
 998         }
 999
1000         /**
1001          * This clears some fields in this object, and clears any associated
1002          * keys in the "bad links" section of $wgLinkCache.
1003          *
1004          * - This is called from Article::insertNewArticle() to allow
1005          * loading of the new page_id. It's also called from
1006          * Article::doDeleteArticle()
1007          *
1008          * @param int $newid the new Article ID
1009          * @access public
1010          */
1011         function resetArticleID( $newid ) {
1012                 global $wgLinkCache;
1013                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1014
1015                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1016                 else { $this->mArticleID = $newid; }
1017                 $this->mRestrictionsLoaded = false;
1018                 $this->mRestrictions = array();
1019         }
1020
1021         /**
1022          * Updates page_touched for this page; called from LinksUpdate.php
1023          * @return bool true if the update succeded
1024          * @access public
1025          */
1026         function invalidateCache() {
1027                 $now = wfTimestampNow();
1028                 $dbw =& wfGetDB( DB_MASTER );
1029                 $success = $dbw->update( 'page',
1030                         array( /* SET */
1031                                 'page_touched' => $dbw->timestamp()
1032                         ), array( /* WHERE */
1033                                 'page_namespace' => $this->getNamespace() ,
1034                                 'page_title' => $this->getDBkey()
1035                         ), 'Title::invalidateCache'
1036                 );
1037                 return $success;
1038         }
1039
1040         /**
1041          * Prefix some arbitrary text with the namespace or interwiki prefix
1042          * of this object
1043          *
1044          * @param string $name the text
1045          * @return string the prefixed text
1046          * @access private
1047          */
1048         /* private */ function prefix( $name ) {
1049                 global $wgContLang;
1050
1051                 $p = '';
1052                 if ( '' != $this->mInterwiki ) {
1053                         $p = $this->mInterwiki . ':';
1054                 }
1055                 if ( 0 != $this->mNamespace ) {
1056                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1057                 }
1058                 return $p . $name;
1059         }
1060
1061         /**
1062          * Secure and split - main initialisation function for this object
1063          *
1064          * Assumes that mDbkeyform has been set, and is urldecoded
1065          * and uses underscores, but not otherwise munged.  This function
1066          * removes illegal characters, splits off the interwiki and
1067          * namespace prefixes, sets the other forms, and canonicalizes
1068          * everything.
1069          * @return bool true on success
1070          * @access private
1071          */
1072         /* private */ function secureAndSplit() {
1073                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1074                 $fname = 'Title::secureAndSplit';
1075                 wfProfileIn( $fname );
1076
1077                 # Initialisation
1078                 static $rxTc = false;
1079                 if( !$rxTc ) {
1080                         # % is needed as well
1081                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1082                 }
1083
1084                 $this->mInterwiki = $this->mFragment = '';
1085                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1086
1087                 # Clean up whitespace
1088                 #
1089                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1090                 $t = trim( $t, '_' );
1091
1092                 if ( '' == $t ) {
1093                         wfProfileOut( $fname );
1094                         return false;
1095                 }
1096
1097                 global $wgUseLatin1;
1098                 if( !$wgUseLatin1 && false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1099                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1100                         wfProfileOut( $fname );
1101                         return false;
1102                 }
1103
1104                 $this->mDbkeyform = $t;
1105
1106                 # Initial colon indicating main namespace
1107                 if ( ':' == $t{0} ) {
1108                         $r = substr( $t, 1 );
1109                         $this->mNamespace = NS_MAIN;
1110                 } else {
1111                         # Namespace or interwiki prefix
1112                         $firstPass = true;
1113                         do {
1114                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1115                                         $p = $m[1];
1116                                         $lowerNs = strtolower( $p );
1117                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1118                                                 # Canonical namespace
1119                                                 $t = $m[2];
1120                                                 $this->mNamespace = $ns;
1121                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1122                                                 # Ordinary namespace
1123                                                 $t = $m[2];
1124                                                 $this->mNamespace = $ns;
1125                                         } elseif( $this->getInterwikiLink( $p ) ) {
1126                                                 if( !$firstPass ) {
1127                                                         # Can't make a local interwiki link to an interwiki link.
1128                                                         # That's just crazy!
1129                                                         wfProfileOut( $fname );
1130                                                         return false;
1131                                                 }
1132
1133                                                 # Interwiki link
1134                                                 $t = $m[2];
1135                                                 $this->mInterwiki = $p;
1136
1137                                                 # Redundant interwiki prefix to the local wiki
1138                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1139                                                         if( $t == '' ) {
1140                                                                 # Can't have an empty self-link
1141                                                                 wfProfileOut( $fname );
1142                                                                 return false;
1143                                                         }
1144                                                         $this->mInterwiki = '';
1145                                                         $firstPass = false;
1146                                                         # Do another namespace split...
1147                                                         continue;
1148                                                 }
1149                                         }
1150                                         # If there's no recognized interwiki or namespace,
1151                                         # then let the colon expression be part of the title.
1152                                 }
1153                                 break;
1154                         } while( true );
1155                         $r = $t;
1156                 }
1157
1158                 # We already know that some pages won't be in the database!
1159                 #
1160                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1161                         $this->mArticleID = 0;
1162                 }
1163                 $f = strstr( $r, '#' );
1164                 if ( false !== $f ) {
1165                         $this->mFragment = substr( $f, 1 );
1166                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1167                         # remove whitespace again: prevents "Foo_bar_#"
1168                         # becoming "Foo_bar_"
1169                         $r = preg_replace( '/_*$/', '', $r );
1170                 }
1171
1172                 # Reject illegal characters.
1173                 #
1174                 if( preg_match( $rxTc, $r ) ) {
1175                         wfProfileOut( $fname );
1176                         return false;
1177                 }
1178
1179                 /**
1180                  * Pages with "/./" or "/../" appearing in the URLs will
1181                  * often be unreachable due to the way web browsers deal
1182                  * with 'relative' URLs. Forbid them explicitly.
1183                  */
1184                 if ( strpos( $r, '.' ) !== false &&
1185                      ( $r === '.' || $r === '..' ||
1186                        strpos( $r, './' ) === 0  ||
1187                        strpos( $r, '../' ) === 0 ||
1188                        strpos( $r, '/./' ) !== false ||
1189                        strpos( $r, '/../' ) !== false ) )
1190                 {
1191                         wfProfileOut( $fname );
1192                         return false;
1193                 }
1194
1195                 # We shouldn't need to query the DB for the size.
1196                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1197                 if ( strlen( $r ) > 255 ) {
1198                         wfProfileOut( $fname );
1199                         return false;
1200                 }
1201
1202                 /**
1203                  * Normally, all wiki links are forced to have
1204                  * an initial capital letter so [[foo]] and [[Foo]]
1205                  * point to the same place.
1206                  *
1207                  * Don't force it for interwikis, since the other
1208                  * site might be case-sensitive.
1209                  */
1210                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1211                         $t = $wgContLang->ucfirst( $r );
1212                 } else {
1213                         $t = $r;
1214                 }
1215
1216                 /**
1217                  * Can't make a link to a namespace alone...
1218                  * "empty" local links can only be self-links
1219                  * with a fragment identifier.
1220                  */
1221                 if( $t == '' &&
1222                         $this->mInterwiki == '' &&
1223                         $this->mNamespace != NS_MAIN ) {
1224                         wfProfileOut( $fname );
1225                         return false;
1226                 }
1227
1228                 # Fill fields
1229                 $this->mDbkeyform = $t;
1230                 $this->mUrlform = wfUrlencode( $t );
1231
1232                 $this->mTextform = str_replace( '_', ' ', $t );
1233
1234                 wfProfileOut( $fname );
1235                 return true;
1236         }
1237
1238         /**
1239          * Get a Title object associated with the talk page of this article
1240          * @return Title the object for the talk page
1241          * @access public
1242          */
1243         function getTalkPage() {
1244                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1245         }
1246
1247         /**
1248          * Get a title object associated with the subject page of this
1249          * talk page
1250          *
1251          * @return Title the object for the subject page
1252          * @access public
1253          */
1254         function getSubjectPage() {
1255                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1256         }
1257
1258         /**
1259          * Get an array of Title objects linking to this Title
1260          * - Also stores the IDs in the link cache.
1261          *
1262          * @param string $options may be FOR UPDATE
1263          * @return array the Title objects linking here
1264          * @access public
1265          */
1266         function getLinksTo( $options = '' ) {
1267                 global $wgLinkCache;
1268                 $id = $this->getArticleID();
1269
1270                 if ( $options ) {
1271                         $db =& wfGetDB( DB_MASTER );
1272                 } else {
1273                         $db =& wfGetDB( DB_SLAVE );
1274                 }
1275                 $page = $db->tableName( 'page' );
1276                 $links = $db->tableName( 'links' );
1277
1278                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1279                 $res = $db->query( $sql, 'Title::getLinksTo' );
1280                 $retVal = array();
1281                 if ( $db->numRows( $res ) ) {
1282                         while ( $row = $db->fetchObject( $res ) ) {
1283                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1284                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1285                                         $retVal[] = $titleObj;
1286                                 }
1287                         }
1288                 }
1289                 $db->freeResult( $res );
1290                 return $retVal;
1291         }
1292
1293         /**
1294          * Get an array of Title objects linking to this non-existent title.
1295          * - Also stores the IDs in the link cache.
1296          *
1297          * @param string $options may be FOR UPDATE
1298          * @return array the Title objects linking here
1299          * @access public
1300          */
1301         function getBrokenLinksTo( $options = '' ) {
1302                 global $wgLinkCache;
1303
1304                 if ( $options ) {
1305                         $db =& wfGetDB( DB_MASTER );
1306                 } else {
1307                         $db =& wfGetDB( DB_SLAVE );
1308                 }
1309                 $page = $db->tableName( 'page' );
1310                 $brokenlinks = $db->tableName( 'brokenlinks' );
1311                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1312
1313                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1314                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1315                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1316                 $retVal = array();
1317                 if ( $db->numRows( $res ) ) {
1318                         while ( $row = $db->fetchObject( $res ) ) {
1319                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1320                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1321                                 $retVal[] = $titleObj;
1322                         }
1323                 }
1324                 $db->freeResult( $res );
1325                 return $retVal;
1326         }
1327
1328         /**
1329          * Get a list of URLs to purge from the Squid cache when this
1330          * page changes
1331          *
1332          * @return array the URLs
1333          * @access public
1334          */
1335         function getSquidURLs() {
1336                 return array(
1337                         $this->getInternalURL(),
1338                         $this->getInternalURL( 'action=history' )
1339                 );
1340         }
1341
1342         /**
1343          * Move this page without authentication
1344          * @param Title &$nt the new page Title
1345          * @access public
1346          */
1347         function moveNoAuth( &$nt ) {
1348                 return $this->moveTo( $nt, false );
1349         }
1350
1351         /**
1352          * Move a title to a new location
1353          * @param Title &$nt the new title
1354          * @param bool $auth indicates whether $wgUser's permissions
1355          *      should be checked
1356          * @return mixed true on success, message name on failure
1357          * @access public
1358          */
1359         function moveTo( &$nt, $auth = true ) {
1360                 global $wgUser;
1361                 if( !$this or !$nt ) {
1362                         return 'badtitletext';
1363                 }
1364
1365                 $fname = 'Title::move';
1366                 $oldid = $this->getArticleID();
1367                 $newid = $nt->getArticleID();
1368
1369                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1370                         return 'articleexists';
1371                 }
1372                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1373                          ( '' == $this->getDBkey() ) ||
1374                          ( '' != $this->getInterwiki() ) ||
1375                          ( !$oldid ) ||
1376                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1377                          ( '' == $nt->getDBkey() ) ||
1378                          ( '' != $nt->getInterwiki() ) ) {
1379                         return 'badarticleerror';
1380                 }
1381
1382                 if ( $auth && (
1383                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1384                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1385                         return 'protectedpage';
1386                 }
1387
1388                 # The move is allowed only if (1) the target doesn't exist, or
1389                 # (2) the target is a redirect to the source, and has no history
1390                 # (so we can undo bad moves right after they're done).
1391
1392                 if ( 0 != $newid ) { # Target exists; check for validity
1393                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1394                                 return 'articleexists';
1395                         }
1396                         $this->moveOverExistingRedirect( $nt );
1397                 } else { # Target didn't exist, do normal move.
1398                         $this->moveToNewTitle( $nt, $newid );
1399                 }
1400
1401                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1402
1403                 $dbw =& wfGetDB( DB_MASTER );
1404                 $categorylinks = $dbw->tableName( 'categorylinks' );
1405                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1406                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1407                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1408                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1409
1410                 # Update watchlists
1411
1412                 $oldnamespace = $this->getNamespace() & ~1;
1413                 $newnamespace = $nt->getNamespace() & ~1;
1414                 $oldtitle = $this->getDBkey();
1415                 $newtitle = $nt->getDBkey();
1416
1417                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1418                         WatchedItem::duplicateEntries( $this, $nt );
1419                 }
1420
1421                 # Update search engine
1422                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1423                 $u->doUpdate();
1424                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1425                 $u->doUpdate();
1426
1427                 wfRunHooks( 'TitleMoveComplete', $this, $nt, $wgUser, $oldid, $newid );
1428                 return true;
1429         }
1430
1431         /**
1432          * Move page to a title which is at present a redirect to the
1433          * source page
1434          *
1435          * @param Title &$nt the page to move to, which should currently
1436          *      be a redirect
1437          * @access private
1438          */
1439         /* private */ function moveOverExistingRedirect( &$nt ) {
1440                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1441                 $fname = 'Title::moveOverExistingRedirect';
1442                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1443
1444                 $now = wfTimestampNow();
1445                 $won = wfInvertTimestamp( $now );
1446                 $rand = wfRandom();
1447                 $newid = $nt->getArticleID();
1448                 $oldid = $this->getArticleID();
1449                 $dbw =& wfGetDB( DB_MASTER );
1450                 $links = $dbw->tableName( 'links' );
1451
1452                 # Delete the old redirect. We don't save it to history since
1453                 # by definition if we've got here it's rather uninteresting.
1454                 # We have to remove it so that the next step doesn't trigger
1455                 # a conflict on the unique namespace+title index...
1456                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1457
1458                 # Change the name of the target page:
1459                 $dbw->update( 'page',
1460                         /* SET */ array(
1461                                 'page_touched' => $dbw->timestamp($now),
1462                                 'page_namespace' => $nt->getNamespace(),
1463                                 'page_title' => $nt->getDBkey()
1464                         ),
1465                         /* WHERE */ array( 'page_id' => $oldid ),
1466                         $fname
1467                 );
1468                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1469
1470                 # Recreate the redirect, this time in the other direction.
1471                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1472                 $dbw->insert( 'revision', array(
1473                         'rev_id' => $dbw->nextSequenceValue('rev_rev_id_seq'),
1474                         'rev_comment' => $comment,
1475                         'rev_user' => $wgUser->getID(),
1476                         'rev_user_text' => $wgUser->getName(),
1477                         'rev_timestamp' => $now,
1478                         'inverse_timestamp' => $won ), $fname
1479                 );
1480                 $revid = $dbw->insertId();
1481                 $dbw->insert( 'text', array(
1482                         'old_id' => $revid,
1483                         'old_flags' => '',
1484                         'old_text' => $redirectText,
1485                         ), $fname
1486                 );
1487                 $dbw->insert( 'page', array(
1488                         'page_id' => $dbw->nextSequenceValue('page_page_id_seq'),
1489                         'page_namespace' => $this->getNamespace(),
1490                         'page_title' => $this->getDBkey(),
1491                         'page_touched' => $now,
1492                         'page_is_redirect' => 1,
1493                         'page_random' => $rand,
1494                         'page_is_new' => 1,
1495                         'page_latest' => $revid), $fname
1496                 );
1497                 $newid = $dbw->insertId();
1498                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1499
1500                 # Record in RC
1501                 // Replaced by a log entry
1502                 // RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1503
1504                 # Log the move
1505                 $log = new LogPage( 'move' );
1506                 $log->addEntry( 'move_redir', $this, '', array(1 => $nt->getText()) );
1507
1508                 # Swap links
1509
1510                 # Load titles and IDs
1511                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1512                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1513
1514                 # Delete them all
1515                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1516                 $dbw->query( $sql, $fname );
1517
1518                 # Reinsert
1519                 if ( count( $linksToOld ) || count( $linksToNew )) {
1520                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1521                         $first = true;
1522
1523                         # Insert links to old title
1524                         foreach ( $linksToOld as $linkTitle ) {
1525                                 if ( $first ) {
1526                                         $first = false;
1527                                 } else {
1528                                         $sql .= ',';
1529                                 }
1530                                 $id = $linkTitle->getArticleID();
1531                                 $sql .= "($id,$newid)";
1532                         }
1533
1534                         # Insert links to new title
1535                         foreach ( $linksToNew as $linkTitle ) {
1536                                 if ( $first ) {
1537                                         $first = false;
1538                                 } else {
1539                                         $sql .= ',';
1540                                 }
1541                                 $id = $linkTitle->getArticleID();
1542                                 $sql .= "($id, $oldid)";
1543                         }
1544
1545                         $dbw->query( $sql, DB_MASTER, $fname );
1546                 }
1547
1548                 # Now, we record the link from the redirect to the new title.
1549                 # It should have no other outgoing links...
1550                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1551                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1552
1553                 # Clear linkscc
1554                 LinkCache::linksccClearLinksTo( $oldid );
1555                 LinkCache::linksccClearLinksTo( $newid );
1556
1557                 # Purge squid
1558                 if ( $wgUseSquid ) {
1559                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1560                         $u = new SquidUpdate( $urls );
1561                         $u->doUpdate();
1562                 }
1563         }
1564
1565         /**
1566          * Move page to non-existing title.
1567          * @param Title &$nt the new Title
1568          * @param int &$newid set to be the new article ID
1569          * @access private
1570          */
1571         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1572                 global $wgUser, $wgLinkCache, $wgUseSquid;
1573                 global $wgMwRedir;
1574                 $fname = 'MovePageForm::moveToNewTitle';
1575                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1576
1577                 $newid = $nt->getArticleID();
1578                 $oldid = $this->getArticleID();
1579                 $dbw =& wfGetDB( DB_MASTER );
1580                 $now = $dbw->timestamp();
1581                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1582                 wfSeedRandom();
1583                 $rand = wfRandom();
1584
1585                 # Rename cur entry
1586                 $dbw->update( 'page',
1587                         /* SET */ array(
1588                                 'page_touched' => $now,
1589                                 'page_namespace' => $nt->getNamespace(),
1590                                 'page_title' => $nt->getDBkey()
1591                         ),
1592                         /* WHERE */ array( 'page_id' => $oldid ),
1593                         $fname
1594                 );
1595
1596                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1597
1598                 # Insert redirect
1599                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1600                 $dbw->insert( 'revision', array(
1601                         'rev_id' => $dbw->nextSequenceValue('rev_rev_id_seq'),
1602                         'rev_comment' => $comment,
1603                         'rev_user' => $wgUser->getID(),
1604                         'rev_user_text' => $wgUser->getName(),
1605                         'rev_timestamp' => $now,
1606                         'inverse_timestamp' => $won ), $fname
1607                 );
1608                 $revid = $dbw->insertId();
1609                 $dbw->insert( 'text', array(
1610                         'old_id' => $revid,
1611                         'old_flags' => '',
1612                         'old_text' => $redirectText
1613                         ), $fname
1614                 );
1615                 $dbw->insert( 'page', array(
1616                         'page_id' => $dbw->nextSequenceValue('page_page_id_seq'),
1617                         'page_namespace' => $this->getNamespace(),
1618                         'page_title' => $this->getDBkey(),
1619                         'page_touched' => $now,
1620                         'page_is_redirect' => 1,
1621                         'page_random' => $rand,
1622                         'page_is_new' => 1,
1623                         'page_latest' => $revid), $fname
1624                 );
1625                 $newid = $dbw->insertId();
1626                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1627
1628                 // attach revision to the new page
1629                 $dbw->update( 'revision', array('rev_page' => $newid), array('rev_id' => $revid), $fname);
1630
1631                 # Record in RC
1632                 // Replaced by a log entry
1633                 // RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1634
1635                 # Log the move
1636                 $log = new LogPage( 'move' );
1637                 $log->addEntry( 'move', $this, '', array(1 => $nt->getText()) );
1638
1639                 # Purge squid and linkscc as per article creation
1640                 Article::onArticleCreate( $nt );
1641
1642                 # Any text links to the old title must be reassigned to the redirect
1643                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1644                 LinkCache::linksccClearLinksTo( $oldid );
1645
1646                 # Record the just-created redirect's linking to the page
1647                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1648
1649                 # Non-existent target may have had broken links to it; these must
1650                 # now be removed and made into good links.
1651                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1652                 $update->fixBrokenLinks();
1653
1654                 # Purge old title from squid
1655                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1656                 $titles = $nt->getLinksTo();
1657                 if ( $wgUseSquid ) {
1658                         $urls = $this->getSquidURLs();
1659                         foreach ( $titles as $linkTitle ) {
1660                                 $urls[] = $linkTitle->getInternalURL();
1661                         }
1662                         $u = new SquidUpdate( $urls );
1663                         $u->doUpdate();
1664                 }
1665         }
1666
1667         /**
1668          * Checks if $this can be moved to a given Title
1669          * - Selects for update, so don't call it unless you mean business
1670          *
1671          * @param Title &$nt the new title to check
1672          * @access public
1673          */
1674         function isValidMoveTarget( $nt ) {
1675
1676                 $fname = 'Title::isValidMoveTarget';
1677                 $dbw =& wfGetDB( DB_MASTER );
1678
1679                 # Is it a redirect?
1680                 $id  = $nt->getArticleID();
1681                 $obj = $dbw->selectRow( array( 'page', 'text') ,
1682                         array( 'page_is_redirect','old_text' ),
1683                         array( 'page_id' => $id, 'page_latest=old_id' ),
1684                         $fname, 'FOR UPDATE' );
1685
1686                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1687                         # Not a redirect
1688                         return false;
1689                 }
1690
1691                 # Does the redirect point to the source?
1692                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1693                         $redirTitle = Title::newFromText( $m[1] );
1694                         if( !is_object( $redirTitle ) ||
1695                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1696                                 return false;
1697                         }
1698                 }
1699
1700                 # Does the article have a history?
1701                 $row = $dbw->selectRow( array( 'page', 'revision'),
1702                         array( 'rev_id' ),
1703                         array( 'page_namespace' => $nt->getNamespace(),
1704                                 'page_title' => $nt->getDBkey(),
1705                                 'page_id=rev_page AND page_latest != rev_id'
1706                         ), $fname, 'FOR UPDATE'
1707                 );
1708
1709                 # Return true if there was no history
1710                 return $row === false;
1711         }
1712
1713         /**
1714          * Create a redirect; fails if the title already exists; does
1715          * not notify RC
1716          *
1717          * @param Title $dest the destination of the redirect
1718          * @param string $comment the comment string describing the move
1719          * @return bool true on success
1720          * @access public
1721          */
1722         function createRedirect( $dest, $comment ) {
1723                 global $wgUser;
1724                 if ( $this->getArticleID() ) {
1725                         return false;
1726                 }
1727
1728                 $fname = 'Title::createRedirect';
1729                 $dbw =& wfGetDB( DB_MASTER );
1730                 $now = wfTimestampNow();
1731                 $won = wfInvertTimestamp( $now );
1732
1733                 $seqVal = $dbw->nextSequenceValue( 'page_page_id_seq' );
1734                 $dbw->insert( 'page', array(
1735                         'page_id' => $seqVal,
1736                         'page_namespace' => $this->getNamespace(),
1737                         'page_title' => $this->getDBkey(),
1738                         'page_touched' => $now,
1739                         'page_is_redirect' => 1,
1740                         'page_is_new' => 1,
1741                         'page_latest' => NULL,
1742                 ), $fname );
1743                 $newid = $dbw->insertId();
1744
1745                 $seqVal = $dbw->nextSequenceValue( 'text_old_id_seq' );
1746                 $dbw->insert( 'text', array(
1747                         'old_id' => $seqVal,
1748                         'old_flags' => '',
1749                         'old_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1750                 ), $fname );
1751                 $revisionId = $dbw->insertId();
1752
1753                 $dbw->insert( 'revision', array(
1754                         'rev_id' => $seqVal,
1755                         'rev_page' => $newid,
1756                         'rev_comment' => $comment,
1757                         'rev_user' => $wgUser->getID(),
1758                         'rev_user_text' => $wgUser->getName(),
1759                         'rev_timestamp' => $now,
1760                         'inverse_timestamp' => $won,
1761                 ), $fname );
1762
1763                 $dbw->update( 'page',
1764                         /* SET */   array( 'page_latest' => $revisionId ),
1765                         /* WHERE */ array( 'page_id' => $newid ),
1766                         $fname );
1767                 $this->resetArticleID( $newid );
1768
1769                 # Link table
1770                 if ( $dest->getArticleID() ) {
1771                         $dbw->insert( 'links',
1772                                 array(
1773                                         'l_to' => $dest->getArticleID(),
1774                                         'l_from' => $newid
1775                                 ), $fname
1776                         );
1777                 } else {
1778                         $dbw->insert( 'brokenlinks',
1779                                 array(
1780                                         'bl_to' => $dest->getPrefixedDBkey(),
1781                                         'bl_from' => $newid
1782                                 ), $fname
1783                         );
1784                 }
1785
1786                 Article::onArticleCreate( $this );
1787                 return true;
1788         }
1789
1790         /**
1791          * Get categories to which this Title belongs and return an array of
1792          * categories' names.
1793          *
1794          * @return array an array of parents in the form:
1795          *      $parent => $currentarticle
1796          * @access public
1797          */
1798         function getParentCategories() {
1799                 global $wgContLang,$wgUser;
1800
1801                 $titlekey = $this->getArticleId();
1802                 $sk =& $wgUser->getSkin();
1803                 $parents = array();
1804                 $dbr =& wfGetDB( DB_SLAVE );
1805                 $categorylinks = $dbr->tableName( 'categorylinks' );
1806
1807                 # NEW SQL
1808                 $sql = "SELECT * FROM $categorylinks"
1809                      ." WHERE cl_from='$titlekey'"
1810                          ." AND cl_from <> '0'"
1811                          ." ORDER BY cl_sortkey";
1812
1813                 $res = $dbr->query ( $sql ) ;
1814
1815                 if($dbr->numRows($res) > 0) {
1816                         while ( $x = $dbr->fetchObject ( $res ) )
1817                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1818                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1819                         $dbr->freeResult ( $res ) ;
1820                 } else {
1821                         $data = '';
1822                 }
1823                 return $data;
1824         }
1825
1826         /**
1827          * Get a tree of parent categories
1828          * @param array $children an array with the children in the keys, to check for circular refs
1829          * @return array
1830          * @access public
1831          */
1832         function getParentCategoryTree( $children = array() ) {
1833                 $parents = $this->getParentCategories();
1834
1835                 if($parents != '') {
1836                         foreach($parents as $parent => $current)
1837                         {
1838                                 if ( array_key_exists( $parent, $children ) ) {
1839                                         # Circular reference
1840                                         $stack[$parent] = array();
1841                                 } else {
1842                                         $nt = Title::newFromText($parent);
1843                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1844                                 }
1845                         }
1846                         return $stack;
1847                 } else {
1848                         return array();
1849                 }
1850         }
1851
1852
1853         /**
1854          * Get an associative array for selecting this title from
1855          * the "cur" table
1856          *
1857          * @return array
1858          * @access public
1859          */
1860         function curCond() {
1861                 wfDebugDieBacktrace( 'curCond called' );
1862                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1863         }
1864
1865         /**
1866          * Get an associative array for selecting this title from the
1867          * "old" table
1868          *
1869          * @return array
1870          * @access public
1871          */
1872         function oldCond() {
1873                 wfDebugDieBacktrace( 'oldCond called' );
1874                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1875         }
1876
1877         /**
1878          * Get the revision ID of the previous revision
1879          *
1880          * @param integer $revision  Revision ID. Get the revision that was before this one.
1881          * @return interger $oldrevision|false
1882          */
1883         function getPreviousRevisionID( $revision ) {
1884                 $dbr =& wfGetDB( DB_SLAVE );
1885                 return $dbr->selectField( 'revision', 'rev_id',
1886                         'rev_page=' . IntVal( $this->getArticleId() ) .
1887                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1888         }
1889
1890         /**
1891          * Get the revision ID of the next revision
1892          *
1893          * @param integer $revision  Revision ID. Get the revision that was after this one.
1894          * @return interger $oldrevision|false
1895          */
1896         function getNextRevisionID( $revision ) {
1897                 $dbr =& wfGetDB( DB_SLAVE );
1898                 return $dbr->selectField( 'revision', 'rev_id',
1899                         'rev_page=' . IntVal( $this->getArticleId() ) .
1900                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1901         }
1902
1903         /**
1904          * Compare with another title.
1905          *
1906          * @param Title $title
1907          * @return bool
1908          */
1909         function equals( &$title ) {
1910                 return $this->getInterwiki() == $title->getInterwiki()
1911                         && $this->getNamespace() == $title->getNamespace()
1912                         && $this->getDbkey() == $title->getDbkey();
1913         }
1914
1915 }
1916 ?>