includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   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, $wgServer, $wgScript;
 620
 621                 if ( '' == $this->mInterwiki ) {
 622                         return $wgServer . $this->getLocalUrl( $query );
 623                 } else {
 624                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 625                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 626                         if ( '' != $namespace ) {
 627                                 # Can this actually happen? Interwikis shouldn't be parsed.
 628                                 $namepace .= ':';
 629                         }
 630                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 631                         if( $query != '' ) {
 632                                 if( false === strpos( $url, '?' ) ) {
 633                                         $url .= '?';
 634                                 } else {
 635                                         $url .= '&';
 636                                 }
 637                                 $url .= $query;
 638                         }
 639                         if ( '' != $this->mFragment ) {
 640                                 $url .= '#' . $this->mFragment;
 641                         }
 642                         return $url;
 643                 }
 644         }
 645
 646         /**
 647          * Get a relative directory for putting an HTML version of this article into
 648          */
 649         function getHashedDirectory() {
 650                 $dbkey = $this->getPrefixedDBkey();
 651                 if ( strlen( $dbkey ) < 2 ) {
 652                         $dbkey = sprintf( "%2s", $dbkey );
 653                 }
 654                 $dir = '';
 655                 for ( $i=0; $i<=1; $i++ ) {
 656                         if ( $i ) {
 657                                 $dir .= '/';
 658                         }
 659                         if ( ord( $dbkey{$i} ) < 128 && ord( $dbkey{$i} ) > 32 ) {
 660                                 $dir .= strtolower( $dbkey{$i} );
 661                         } else {
 662                                 $dir .= sprintf( "%02X", ord( $dbkey{$i} ) );
 663                         }
 664                 }
 665                 return $dir;
 666         }
 667
 668         function getHashedFilename() {
 669                 $dbkey = $this->getPrefixedDBkey();
 670                 $dir = $this->getHashedDirectory();
 671                 $friendlyName = strtr( $dbkey, '/\\:*?"<>|', '_________' );
 672                 return "$dir/$friendlyName.html";
 673         }
 674
 675         /**
 676          * Get a URL with no fragment or server name
 677          * @param string $query an optional query string; if not specified,
 678          *      $wgArticlePath will be used.
 679          * @return string the URL
 680          * @access public
 681          */
 682         function getLocalURL( $query = '' ) {
 683                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks;
 684
 685                 if ( $this->isExternal() ) {
 686                         return $this->getFullURL();
 687                 }
 688
 689                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 690                 if ( $wgMakeDumpLinks ) {
 691                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 692                 } elseif ( $query == '' ) {
 693                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 694                 } else {
 695                         if( preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 696                                 global $wgActionPaths;
 697                                 $action = urldecode( $matches[2] );
 698                                 if( isset( $wgActionPaths[$action] ) ) {
 699                                         $query = $matches[1];
 700                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 701                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 702                                         if( $query != '' ) $url .= '?' . $query;
 703                                         return $url;
 704                                 }
 705                         }
 706                         if ( $query == '-' ) {
 707                                 $query = '';
 708                         }
 709                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 710                 }
 711                 return $url;
 712         }
 713
 714         /**
 715          * Get an HTML-escaped version of the URL form, suitable for
 716          * using in a link, without a server name or fragment
 717          * @param string $query an optional query string
 718          * @return string the URL
 719          * @access public
 720          */
 721         function escapeLocalURL( $query = '' ) {
 722                 return htmlspecialchars( $this->getLocalURL( $query ) );
 723         }
 724
 725         /**
 726          * Get an HTML-escaped version of the URL form, suitable for
 727          * using in a link, including the server name and fragment
 728          *
 729          * @return string the URL
 730          * @param string $query an optional query string
 731          * @access public
 732          */
 733         function escapeFullURL( $query = '' ) {
 734                 return htmlspecialchars( $this->getFullURL( $query ) );
 735         }
 736
 737         /**
 738          * Get the URL form for an internal link.
 739          * - Used in various Squid-related code, in case we have a different
 740          * internal hostname for the server from the exposed one.
 741          *
 742          * @param string $query an optional query string
 743          * @return string the URL
 744          * @access public
 745          */
 746         function getInternalURL( $query = '' ) {
 747                 global $wgInternalServer;
 748                 return $wgInternalServer . $this->getLocalURL( $query );
 749         }
 750
 751         /**
 752          * Get the edit URL for this Title
 753          * @return string the URL, or a null string if this is an
 754          *      interwiki link
 755          * @access public
 756          */
 757         function getEditURL() {
 758                 global $wgServer, $wgScript;
 759
 760                 if ( '' != $this->mInterwiki ) { return ''; }
 761                 $s = $this->getLocalURL( 'action=edit' );
 762
 763                 return $s;
 764         }
 765
 766         /**
 767          * Get the HTML-escaped displayable text form.
 768          * Used for the title field in <a> tags.
 769          * @return string the text, including any prefixes
 770          * @access public
 771          */
 772         function getEscapedText() {
 773                 return htmlspecialchars( $this->getPrefixedText() );
 774         }
 775
 776         /**
 777          * Is this Title interwiki?
 778          * @return boolean
 779          * @access public
 780          */
 781         function isExternal() { return ( '' != $this->mInterwiki ); }
 782
 783         /**
 784          * Does the title correspond to a protected article?
 785          * @param string $what the action the page is protected from,
 786          *      by default checks move and edit
 787          * @return boolean
 788          * @access public
 789          */
 790         function isProtected($action = '') {
 791                 if ( -1 == $this->mNamespace ) { return true; }
 792                 if($action == 'edit' || $action == '') {
 793                         $a = $this->getRestrictions("edit");
 794                         if ( in_array( 'sysop', $a ) ) { return true; }
 795                 }
 796                 if($action == 'move' || $action == '') {
 797                         $a = $this->getRestrictions("move");
 798                         if ( in_array( 'sysop', $a ) ) { return true; }
 799                 }
 800                 return false;
 801         }
 802
 803         /**
 804          * Is $wgUser is watching this page?
 805          * @return boolean
 806          * @access public
 807          */
 808         function userIsWatching() {
 809                 global $wgUser;
 810
 811                 if ( -1 == $this->mNamespace ) { return false; }
 812                 if ( 0 == $wgUser->getID() ) { return false; }
 813
 814                 return $wgUser->isWatched( $this );
 815         }
 816
 817         /**
 818          * Is $wgUser perform $action this page?
 819          * @param string $action action that permission needs to be checked for
 820          * @return boolean
 821          * @access private
 822          */
 823         function userCan($action) {
 824                 $fname = 'Title::userCanEdit';
 825                 wfProfileIn( $fname );
 826
 827                 global $wgUser;
 828                 if( NS_SPECIAL == $this->mNamespace ) {
 829                         wfProfileOut( $fname );
 830                         return false;
 831                 }
 832                 if( NS_MEDIAWIKI == $this->mNamespace &&
 833                     !$wgUser->isAllowed('editinterface') ) {
 834                         wfProfileOut( $fname );
 835                         return false;
 836                 }
 837                 if( $this->mDbkeyform == '_' ) {
 838                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 839                         wfProfileOut( $fname );
 840                         return false;
 841                 }
 842
 843                 # protect global styles and js
 844                 if ( NS_MEDIAWIKI == $this->mNamespace
 845                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 846                      && !$wgUser->isAllowed('editinterface') ) {
 847                         wfProfileOut( $fname );
 848                         return false;
 849                 }
 850
 851                 # protect css/js subpages of user pages
 852                 # XXX: this might be better using restrictions
 853                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 854                 if( NS_USER == $this->mNamespace
 855                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 856                         && !$wgUser->isAllowed('editinterface')
 857                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 858                         wfProfileOut( $fname );
 859                         return false;
 860                 }
 861
 862                 foreach( $this->getRestrictions($action) as $right ) {
 863                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 864                                 wfProfileOut( $fname );
 865                                 return false;
 866                         }
 867                 }
 868
 869                 if( $action == 'move' && !$this->isMovable() ) {
 870                         wfProfileOut( $fname );
 871                         return false;
 872                 }
 873
 874                 wfProfileOut( $fname );
 875                 return true;
 876         }
 877
 878         /**
 879          * Can $wgUser edit this page?
 880          * @return boolean
 881          * @access public
 882          */
 883         function userCanEdit() {
 884                 return $this->userCan('edit');
 885         }
 886
 887         /**
 888          * Can $wgUser move this page?
 889          * @return boolean
 890          * @access public
 891          */
 892         function userCanMove() {
 893                 return $this->userCan('move');
 894         }
 895
 896         /**
 897          * Would anybody with sufficient privileges be able to mvoe this page?
 898          * Some pages just ain't movable.
 899          *
 900          * @return boolean
 901          * @access public
 902          */
 903         function isMovable() {
 904                 return Namespace::isMovable( $this->getNamespace() )
 905                         && $this->getInterwiki() == '';
 906         }
 907
 908         /**
 909          * Can $wgUser read this page?
 910          * @return boolean
 911          * @access public
 912          */
 913         function userCanRead() {
 914                 global $wgUser;
 915
 916                 if( $wgUser->isAllowed('read') ) {
 917                         return true;
 918                 } else {
 919                         global $wgWhitelistRead;
 920
 921                         /** If anon users can create an account,
 922                             they need to reach the login page first! */
 923                         if( $wgUser->isAllowed( 'createaccount' )
 924                             && $this->mId == NS_SPECIAL
 925                             && $this->getText() == 'Userlogin' ) {
 926                                 return true;
 927                         }
 928
 929                         /** some pages are explicitly allowed */
 930                         $name = $this->getPrefixedText();
 931                         if( in_array( $name, $wgWhitelistRead ) ) {
 932                                 return true;
 933                         }
 934
 935                         # Compatibility with old settings
 936                         if( $this->getNamespace() == NS_MAIN ) {
 937                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 938                                         return true;
 939                                 }
 940                         }
 941                 }
 942                 return false;
 943         }
 944
 945         /**
 946          * Is this a talk page of some sort?
 947          * @return bool
 948          * @access public
 949          */
 950         function isTalkPage() {
 951                 return Namespace::isTalk( $this->getNamespace() );
 952         }
 953
 954         /**
 955          * Is this a .css or .js subpage of a user page?
 956          * @return bool
 957          * @access public
 958          */
 959         function isCssJsSubpage() {
 960                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 961         }
 962         /**
 963          * Is this a .css subpage of a user page?
 964          * @return bool
 965          * @access public
 966          */
 967         function isCssSubpage() {
 968                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 969         }
 970         /**
 971          * Is this a .js subpage of a user page?
 972          * @return bool
 973          * @access public
 974          */
 975         function isJsSubpage() {
 976                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 977         }
 978         /**
 979          * Protect css/js subpages of user pages: can $wgUser edit
 980          * this page?
 981          *
 982          * @return boolean
 983          * @todo XXX: this might be better using restrictions
 984          * @access public
 985          */
 986         function userCanEditCssJsSubpage() {
 987                 global $wgUser;
 988                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 989         }
 990
 991         /**
 992          * Loads a string into mRestrictions array
 993          * @param string $res restrictions in string format
 994          * @access public
 995          */
 996         function loadRestrictions( $res ) {
 997                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 998                         $temp = explode( '=', trim( $restrict ) );
 999                         if(count($temp) == 1) {
1000                                 // old format should be treated as edit/move restriction
1001                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1002                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1003                         } else {
1004                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1005                         }
1006                 }
1007                 $this->mRestrictionsLoaded = true;
1008         }
1009
1010         /**
1011          * Accessor/initialisation for mRestrictions
1012          * @param string $action action that permission needs to be checked for
1013          * @return array the array of groups allowed to edit this article
1014          * @access public
1015          */
1016         function getRestrictions($action) {
1017                 $id = $this->getArticleID();
1018                 if ( 0 == $id ) { return array(); }
1019
1020                 if ( ! $this->mRestrictionsLoaded ) {
1021                         $dbr =& wfGetDB( DB_SLAVE );
1022                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1023                         $this->loadRestrictions( $res );
1024                 }
1025                 if( isset( $this->mRestrictions[$action] ) ) {
1026                         return $this->mRestrictions[$action];
1027                 }
1028                 return array();
1029         }
1030
1031         /**
1032          * Is there a version of this page in the deletion archive?
1033          * @return int the number of archived revisions
1034          * @access public
1035          */
1036         function isDeleted() {
1037                 $fname = 'Title::isDeleted';
1038                 $dbr =& wfGetDB( DB_SLAVE );
1039                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1040                         'ar_title' => $this->getDBkey() ), $fname );
1041                 return (int)$n;
1042         }
1043
1044         /**
1045          * Get the article ID for this Title from the link cache,
1046          * adding it if necessary
1047          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1048          *      for update
1049          * @return int the ID
1050          * @access public
1051          */
1052         function getArticleID( $flags = 0 ) {
1053                 global $wgLinkCache;
1054
1055                 if ( $flags & GAID_FOR_UPDATE ) {
1056                         $oldUpdate = $wgLinkCache->forUpdate( true );
1057                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1058                         $wgLinkCache->forUpdate( $oldUpdate );
1059                 } else {
1060                         if ( -1 == $this->mArticleID ) {
1061                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1062                         }
1063                 }
1064                 return $this->mArticleID;
1065         }
1066
1067         /**
1068          * This clears some fields in this object, and clears any associated
1069          * keys in the "bad links" section of $wgLinkCache.
1070          *
1071          * - This is called from Article::insertNewArticle() to allow
1072          * loading of the new page_id. It's also called from
1073          * Article::doDeleteArticle()
1074          *
1075          * @param int $newid the new Article ID
1076          * @access public
1077          */
1078         function resetArticleID( $newid ) {
1079                 global $wgLinkCache;
1080                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1081
1082                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1083                 else { $this->mArticleID = $newid; }
1084                 $this->mRestrictionsLoaded = false;
1085                 $this->mRestrictions = array();
1086         }
1087
1088         /**
1089          * Updates page_touched for this page; called from LinksUpdate.php
1090          * @return bool true if the update succeded
1091          * @access public
1092          */
1093         function invalidateCache() {
1094                 if ( wfReadOnly() ) {
1095                         return;
1096                 }
1097
1098                 $now = wfTimestampNow();
1099                 $dbw =& wfGetDB( DB_MASTER );
1100                 $success = $dbw->update( 'page',
1101                         array( /* SET */
1102                                 'page_touched' => $dbw->timestamp()
1103                         ), array( /* WHERE */
1104                                 'page_namespace' => $this->getNamespace() ,
1105                                 'page_title' => $this->getDBkey()
1106                         ), 'Title::invalidateCache'
1107                 );
1108                 return $success;
1109         }
1110
1111         /**
1112          * Prefix some arbitrary text with the namespace or interwiki prefix
1113          * of this object
1114          *
1115          * @param string $name the text
1116          * @return string the prefixed text
1117          * @access private
1118          */
1119         /* private */ function prefix( $name ) {
1120                 global $wgContLang;
1121
1122                 $p = '';
1123                 if ( '' != $this->mInterwiki ) {
1124                         $p = $this->mInterwiki . ':';
1125                 }
1126                 if ( 0 != $this->mNamespace ) {
1127                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1128                 }
1129                 return $p . $name;
1130         }
1131
1132         /**
1133          * Secure and split - main initialisation function for this object
1134          *
1135          * Assumes that mDbkeyform has been set, and is urldecoded
1136          * and uses underscores, but not otherwise munged.  This function
1137          * removes illegal characters, splits off the interwiki and
1138          * namespace prefixes, sets the other forms, and canonicalizes
1139          * everything.
1140          * @return bool true on success
1141          * @access private
1142          */
1143         /* private */ function secureAndSplit() {
1144                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1145                 $fname = 'Title::secureAndSplit';
1146                 wfProfileIn( $fname );
1147
1148                 # Initialisation
1149                 static $rxTc = false;
1150                 if( !$rxTc ) {
1151                         # % is needed as well
1152                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1153                 }
1154
1155                 $this->mInterwiki = $this->mFragment = '';
1156                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1157
1158                 # Clean up whitespace
1159                 #
1160                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1161                 $t = trim( $t, '_' );
1162
1163                 if ( '' == $t ) {
1164                         wfProfileOut( $fname );
1165                         return false;
1166                 }
1167
1168                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1169                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1170                         wfProfileOut( $fname );
1171                         return false;
1172                 }
1173
1174                 $this->mDbkeyform = $t;
1175
1176                 # Initial colon indicating main namespace
1177                 if ( ':' == $t{0} ) {
1178                         $r = substr( $t, 1 );
1179                         $this->mNamespace = NS_MAIN;
1180                 } else {
1181                         # Namespace or interwiki prefix
1182                         $firstPass = true;
1183                         do {
1184                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1185                                         $p = $m[1];
1186                                         $lowerNs = strtolower( $p );
1187                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1188                                                 # Canonical namespace
1189                                                 $t = $m[2];
1190                                                 $this->mNamespace = $ns;
1191                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1192                                                 # Ordinary namespace
1193                                                 $t = $m[2];
1194                                                 $this->mNamespace = $ns;
1195                                         } elseif( $this->getInterwikiLink( $p ) ) {
1196                                                 if( !$firstPass ) {
1197                                                         # Can't make a local interwiki link to an interwiki link.
1198                                                         # That's just crazy!
1199                                                         wfProfileOut( $fname );
1200                                                         return false;
1201                                                 }
1202
1203                                                 # Interwiki link
1204                                                 $t = $m[2];
1205                                                 $this->mInterwiki = $p;
1206
1207                                                 # Redundant interwiki prefix to the local wiki
1208                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1209                                                         if( $t == '' ) {
1210                                                                 # Can't have an empty self-link
1211                                                                 wfProfileOut( $fname );
1212                                                                 return false;
1213                                                         }
1214                                                         $this->mInterwiki = '';
1215                                                         $firstPass = false;
1216                                                         # Do another namespace split...
1217                                                         continue;
1218                                                 }
1219                                         }
1220                                         # If there's no recognized interwiki or namespace,
1221                                         # then let the colon expression be part of the title.
1222                                 }
1223                                 break;
1224                         } while( true );
1225                         $r = $t;
1226                 }
1227
1228                 # We already know that some pages won't be in the database!
1229                 #
1230                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1231                         $this->mArticleID = 0;
1232                 }
1233                 $f = strstr( $r, '#' );
1234                 if ( false !== $f ) {
1235                         $this->mFragment = substr( $f, 1 );
1236                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1237                         # remove whitespace again: prevents "Foo_bar_#"
1238                         # becoming "Foo_bar_"
1239                         $r = preg_replace( '/_*$/', '', $r );
1240                 }
1241
1242                 # Reject illegal characters.
1243                 #
1244                 if( preg_match( $rxTc, $r ) ) {
1245                         wfProfileOut( $fname );
1246                         return false;
1247                 }
1248
1249                 /**
1250                  * Pages with "/./" or "/../" appearing in the URLs will
1251                  * often be unreachable due to the way web browsers deal
1252                  * with 'relative' URLs. Forbid them explicitly.
1253                  */
1254                 if ( strpos( $r, '.' ) !== false &&
1255                      ( $r === '.' || $r === '..' ||
1256                        strpos( $r, './' ) === 0  ||
1257                        strpos( $r, '../' ) === 0 ||
1258                        strpos( $r, '/./' ) !== false ||
1259                        strpos( $r, '/../' ) !== false ) )
1260                 {
1261                         wfProfileOut( $fname );
1262                         return false;
1263                 }
1264
1265                 # We shouldn't need to query the DB for the size.
1266                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1267                 if ( strlen( $r ) > 255 ) {
1268                         wfProfileOut( $fname );
1269                         return false;
1270                 }
1271
1272                 /**
1273                  * Normally, all wiki links are forced to have
1274                  * an initial capital letter so [[foo]] and [[Foo]]
1275                  * point to the same place.
1276                  *
1277                  * Don't force it for interwikis, since the other
1278                  * site might be case-sensitive.
1279                  */
1280                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1281                         $t = $wgContLang->ucfirst( $r );
1282                 } else {
1283                         $t = $r;
1284                 }
1285
1286                 /**
1287                  * Can't make a link to a namespace alone...
1288                  * "empty" local links can only be self-links
1289                  * with a fragment identifier.
1290                  */
1291                 if( $t == '' &&
1292                         $this->mInterwiki == '' &&
1293                         $this->mNamespace != NS_MAIN ) {
1294                         wfProfileOut( $fname );
1295                         return false;
1296                 }
1297
1298                 # Fill fields
1299                 $this->mDbkeyform = $t;
1300                 $this->mUrlform = wfUrlencode( $t );
1301
1302                 $this->mTextform = str_replace( '_', ' ', $t );
1303
1304                 wfProfileOut( $fname );
1305                 return true;
1306         }
1307
1308         /**
1309          * Get a Title object associated with the talk page of this article
1310          * @return Title the object for the talk page
1311          * @access public
1312          */
1313         function getTalkPage() {
1314                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1315         }
1316
1317         /**
1318          * Get a title object associated with the subject page of this
1319          * talk page
1320          *
1321          * @return Title the object for the subject page
1322          * @access public
1323          */
1324         function getSubjectPage() {
1325                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1326         }
1327
1328         /**
1329          * Get an array of Title objects linking to this Title
1330          * - Also stores the IDs in the link cache.
1331          *
1332          * @param string $options may be FOR UPDATE
1333          * @return array the Title objects linking here
1334          * @access public
1335          */
1336         function getLinksTo( $options = '' ) {
1337                 global $wgLinkCache;
1338                 $id = $this->getArticleID();
1339
1340                 if ( $options ) {
1341                         $db =& wfGetDB( DB_MASTER );
1342                 } else {
1343                         $db =& wfGetDB( DB_SLAVE );
1344                 }
1345                 $page = $db->tableName( 'page' );
1346                 $links = $db->tableName( 'links' );
1347
1348                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1349                 $res = $db->query( $sql, 'Title::getLinksTo' );
1350                 $retVal = array();
1351                 if ( $db->numRows( $res ) ) {
1352                         while ( $row = $db->fetchObject( $res ) ) {
1353                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1354                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1355                                         $retVal[] = $titleObj;
1356                                 }
1357                         }
1358                 }
1359                 $db->freeResult( $res );
1360                 return $retVal;
1361         }
1362
1363         /**
1364          * Get an array of Title objects linking to this non-existent title.
1365          * - Also stores the IDs in the link cache.
1366          *
1367          * @param string $options may be FOR UPDATE
1368          * @return array the Title objects linking here
1369          * @access public
1370          */
1371         function getBrokenLinksTo( $options = '' ) {
1372                 global $wgLinkCache;
1373
1374                 if ( $options ) {
1375                         $db =& wfGetDB( DB_MASTER );
1376                 } else {
1377                         $db =& wfGetDB( DB_SLAVE );
1378                 }
1379                 $page = $db->tableName( 'page' );
1380                 $brokenlinks = $db->tableName( 'brokenlinks' );
1381                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1382
1383                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1384                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1385                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1386                 $retVal = array();
1387                 if ( $db->numRows( $res ) ) {
1388                         while ( $row = $db->fetchObject( $res ) ) {
1389                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1390                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1391                                 $retVal[] = $titleObj;
1392                         }
1393                 }
1394                 $db->freeResult( $res );
1395                 return $retVal;
1396         }
1397
1398
1399         /**
1400          * Get an array of Title objects referring to non-existent articles linked from this page
1401          *
1402          * @param string $options may be FOR UPDATE
1403          * @return array the Title objects
1404          * @access public
1405          */
1406         function getBrokenLinksFrom( $options = '' ) {
1407                 global $wgLinkCache;
1408
1409                 if ( $options ) {
1410                         $db =& wfGetDB( DB_MASTER );
1411                 } else {
1412                         $db =& wfGetDB( DB_SLAVE );
1413                 }
1414                 $page = $db->tableName( 'page' );
1415                 $brokenlinks = $db->tableName( 'brokenlinks' );
1416                 $id = $this->getArticleID();
1417
1418                 $sql = "SELECT bl_to FROM $brokenlinks WHERE bl_from=$id $options";
1419                 $res = $db->query( $sql, "Title::getBrokenLinksFrom" );
1420                 $retVal = array();
1421                 if ( $db->numRows( $res ) ) {
1422                         while ( $row = $db->fetchObject( $res ) ) {
1423                                 $retVal[] = Title::newFromText( $row->bl_to );
1424                         }
1425                 }
1426                 $db->freeResult( $res );
1427                 return $retVal;
1428         }
1429
1430
1431         /**
1432          * Get a list of URLs to purge from the Squid cache when this
1433          * page changes
1434          *
1435          * @return array the URLs
1436          * @access public
1437          */
1438         function getSquidURLs() {
1439                 return array(
1440                         $this->getInternalURL(),
1441                         $this->getInternalURL( 'action=history' )
1442                 );
1443         }
1444
1445         /**
1446          * Move this page without authentication
1447          * @param Title &$nt the new page Title
1448          * @access public
1449          */
1450         function moveNoAuth( &$nt ) {
1451                 return $this->moveTo( $nt, false );
1452         }
1453
1454         /**
1455          * Check whether a given move operation would be valid.
1456          * Returns true if ok, or a message key string for an error message
1457          * if invalid. (Scarrrrry ugly interface this.)
1458          * @param Title &$nt the new title
1459          * @param bool $auth indicates whether $wgUser's permissions
1460          *      should be checked
1461          * @return mixed true on success, message name on failure
1462          * @access public
1463          */
1464         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1465                 global $wgUser;
1466                 if( !$this or !$nt ) {
1467                         return 'badtitletext';
1468                 }
1469                 if( $this->equals( $nt ) ) {
1470                         return 'selfmove';
1471                 }
1472                 if( !$this->isMovable() || !$nt->isMovable() ) {
1473                         return 'immobile_namespace';
1474                 }
1475
1476                 $fname = 'Title::move';
1477                 $oldid = $this->getArticleID();
1478                 $newid = $nt->getArticleID();
1479
1480                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1481                         return 'articleexists';
1482                 }
1483                 if ( ( '' == $this->getDBkey() ) ||
1484                          ( !$oldid ) ||
1485                      ( '' == $nt->getDBkey() ) ) {
1486                         return 'badarticleerror';
1487                 }
1488
1489                 if ( $auth && (
1490                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1491                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1492                         return 'protectedpage';
1493                 }
1494
1495                 # The move is allowed only if (1) the target doesn't exist, or
1496                 # (2) the target is a redirect to the source, and has no history
1497                 # (so we can undo bad moves right after they're done).
1498
1499                 if ( 0 != $newid ) { # Target exists; check for validity
1500                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1501                                 return 'articleexists';
1502                         }
1503                 }
1504                 return true;
1505         }
1506
1507         /**
1508          * Move a title to a new location
1509          * @param Title &$nt the new title
1510          * @param bool $auth indicates whether $wgUser's permissions
1511          *      should be checked
1512          * @return mixed true on success, message name on failure
1513          * @access public
1514          */
1515         function moveTo( &$nt, $auth = true, $reason = '' ) {
1516                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1517                 if( is_string( $err ) ) {
1518                         return $err;
1519                 }
1520                 if( $nt->exists() ) {
1521                         $this->moveOverExistingRedirect( $nt, $reason );
1522                 } else { # Target didn't exist, do normal move.
1523                         $this->moveToNewTitle( $nt, $newid, $reason );
1524                 }
1525
1526                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1527
1528                 $dbw =& wfGetDB( DB_MASTER );
1529                 $categorylinks = $dbw->tableName( 'categorylinks' );
1530                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1531                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1532                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1533                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1534
1535                 # Update watchlists
1536
1537                 $oldnamespace = $this->getNamespace() & ~1;
1538                 $newnamespace = $nt->getNamespace() & ~1;
1539                 $oldtitle = $this->getDBkey();
1540                 $newtitle = $nt->getDBkey();
1541
1542                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1543                         WatchedItem::duplicateEntries( $this, $nt );
1544                 }
1545
1546                 # Update search engine
1547                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1548                 $u->doUpdate();
1549                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1550                 $u->doUpdate();
1551
1552                 wfRunHooks( 'TitleMoveComplete', array(&$this, &$nt, &$wgUser, $oldid, $newid) );
1553                 return true;
1554         }
1555
1556         /**
1557          * Move page to a title which is at present a redirect to the
1558          * source page
1559          *
1560          * @param Title &$nt the page to move to, which should currently
1561          *      be a redirect
1562          * @access private
1563          */
1564         /* private */ function moveOverExistingRedirect( &$nt, $reason = '' ) {
1565                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1566                 $fname = 'Title::moveOverExistingRedirect';
1567                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1568
1569                 if ( $reason ) {
1570                         $comment .= ": $reason";
1571                 }
1572
1573                 $now = wfTimestampNow();
1574                 $rand = wfRandom();
1575                 $newid = $nt->getArticleID();
1576                 $oldid = $this->getArticleID();
1577                 $dbw =& wfGetDB( DB_MASTER );
1578                 $links = $dbw->tableName( 'links' );
1579
1580                 # Delete the old redirect. We don't save it to history since
1581                 # by definition if we've got here it's rather uninteresting.
1582                 # We have to remove it so that the next step doesn't trigger
1583                 # a conflict on the unique namespace+title index...
1584                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1585
1586                 # Save a null revision in the page's history notifying of the move
1587                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1588                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1589                         true );
1590                 $nullRevId = $nullRevision->insertOn( $dbw );
1591
1592                 # Change the name of the target page:
1593                 $dbw->update( 'page',
1594                         /* SET */ array(
1595                                 'page_touched'   => $dbw->timestamp($now),
1596                                 'page_namespace' => $nt->getNamespace(),
1597                                 'page_title'     => $nt->getDBkey(),
1598                                 'page_latest'    => $nullRevId,
1599                         ),
1600                         /* WHERE */ array( 'page_id' => $oldid ),
1601                         $fname
1602                 );
1603                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1604
1605                 # Recreate the redirect, this time in the other direction.
1606                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1607                 $redirectArticle = new Article( $this );
1608                 $newid = $redirectArticle->insertOn( $dbw );
1609                 $redirectRevision = new Revision( array(
1610                         'page'    => $newid,
1611                         'comment' => $comment,
1612                         'text'    => $redirectText ) );
1613                 $revid = $redirectRevision->insertOn( $dbw );
1614                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1615                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1616
1617                 # Log the move
1618                 $log = new LogPage( 'move' );
1619                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1620
1621                 # Swap links
1622
1623                 # Load titles and IDs
1624                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1625                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1626
1627                 # Delete them all
1628                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1629                 $dbw->query( $sql, $fname );
1630
1631                 # Reinsert
1632                 if ( count( $linksToOld ) || count( $linksToNew )) {
1633                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1634                         $first = true;
1635
1636                         # Insert links to old title
1637                         foreach ( $linksToOld as $linkTitle ) {
1638                                 if ( $first ) {
1639                                         $first = false;
1640                                 } else {
1641                                         $sql .= ',';
1642                                 }
1643                                 $id = $linkTitle->getArticleID();
1644                                 $sql .= "($id,$newid)";
1645                         }
1646
1647                         # Insert links to new title
1648                         foreach ( $linksToNew as $linkTitle ) {
1649                                 if ( $first ) {
1650                                         $first = false;
1651                                 } else {
1652                                         $sql .= ',';
1653                                 }
1654                                 $id = $linkTitle->getArticleID();
1655                                 $sql .= "($id, $oldid)";
1656                         }
1657
1658                         $dbw->query( $sql, $fname );
1659                 }
1660
1661                 # Now, we record the link from the redirect to the new title.
1662                 # It should have no other outgoing links...
1663                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1664                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1665
1666                 # Clear linkscc
1667                 LinkCache::linksccClearLinksTo( $oldid );
1668                 LinkCache::linksccClearLinksTo( $newid );
1669
1670                 # Purge squid
1671                 if ( $wgUseSquid ) {
1672                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1673                         $u = new SquidUpdate( $urls );
1674                         $u->doUpdate();
1675                 }
1676         }
1677
1678         /**
1679          * Move page to non-existing title.
1680          * @param Title &$nt the new Title
1681          * @param int &$newid set to be the new article ID
1682          * @access private
1683          */
1684         /* private */ function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1685                 global $wgUser, $wgLinkCache, $wgUseSquid;
1686                 global $wgMwRedir;
1687                 $fname = 'MovePageForm::moveToNewTitle';
1688                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1689                 if ( $reason ) {
1690                         $comment .= ": $reason";
1691                 }
1692
1693                 $newid = $nt->getArticleID();
1694                 $oldid = $this->getArticleID();
1695                 $dbw =& wfGetDB( DB_MASTER );
1696                 $now = $dbw->timestamp();
1697                 wfSeedRandom();
1698                 $rand = wfRandom();
1699
1700                 # Save a null revision in the page's history notifying of the move
1701                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1702                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1703                         true );
1704                 $nullRevId = $nullRevision->insertOn( $dbw );
1705
1706                 # Rename cur entry
1707                 $dbw->update( 'page',
1708                         /* SET */ array(
1709                                 'page_touched'   => $now,
1710                                 'page_namespace' => $nt->getNamespace(),
1711                                 'page_title'     => $nt->getDBkey(),
1712                                 'page_latest'    => $nullRevId,
1713                         ),
1714                         /* WHERE */ array( 'page_id' => $oldid ),
1715                         $fname
1716                 );
1717
1718                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1719
1720                 # Insert redirect
1721                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1722                 $redirectArticle = new Article( $this );
1723                 $newid = $redirectArticle->insertOn( $dbw );
1724                 $redirectRevision = new Revision( array(
1725                         'page'    => $newid,
1726                         'comment' => $comment,
1727                         'text'    => $redirectText ) );
1728                 $revid = $redirectRevision->insertOn( $dbw );
1729                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1730                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1731
1732                 # Log the move
1733                 $log = new LogPage( 'move' );
1734                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1735
1736                 # Purge squid and linkscc as per article creation
1737                 Article::onArticleCreate( $nt );
1738
1739                 # Any text links to the old title must be reassigned to the redirect
1740                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1741                 LinkCache::linksccClearLinksTo( $oldid );
1742
1743                 # Record the just-created redirect's linking to the page
1744                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1745
1746                 # Non-existent target may have had broken links to it; these must
1747                 # now be removed and made into good links.
1748                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1749                 $update->fixBrokenLinks();
1750
1751                 # Purge old title from squid
1752                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1753                 $titles = $nt->getLinksTo();
1754                 if ( $wgUseSquid ) {
1755                         $urls = $this->getSquidURLs();
1756                         foreach ( $titles as $linkTitle ) {
1757                                 $urls[] = $linkTitle->getInternalURL();
1758                         }
1759                         $u = new SquidUpdate( $urls );
1760                         $u->doUpdate();
1761                 }
1762         }
1763
1764         /**
1765          * Checks if $this can be moved to a given Title
1766          * - Selects for update, so don't call it unless you mean business
1767          *
1768          * @param Title &$nt the new title to check
1769          * @access public
1770          */
1771         function isValidMoveTarget( $nt ) {
1772
1773                 $fname = 'Title::isValidMoveTarget';
1774                 $dbw =& wfGetDB( DB_MASTER );
1775
1776                 # Is it a redirect?
1777                 $id  = $nt->getArticleID();
1778                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1779                         array( 'page_is_redirect','old_text' ),
1780                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1781                         $fname, 'FOR UPDATE' );
1782
1783                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1784                         # Not a redirect
1785                         return false;
1786                 }
1787
1788                 # Does the redirect point to the source?
1789                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1790                         $redirTitle = Title::newFromText( $m[1] );
1791                         if( !is_object( $redirTitle ) ||
1792                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1793                                 return false;
1794                         }
1795                 }
1796
1797                 # Does the article have a history?
1798                 $row = $dbw->selectRow( array( 'page', 'revision'),
1799                         array( 'rev_id' ),
1800                         array( 'page_namespace' => $nt->getNamespace(),
1801                                 'page_title' => $nt->getDBkey(),
1802                                 'page_id=rev_page AND page_latest != rev_id'
1803                         ), $fname, 'FOR UPDATE'
1804                 );
1805
1806                 # Return true if there was no history
1807                 return $row === false;
1808         }
1809
1810         /**
1811          * Create a redirect; fails if the title already exists; does
1812          * not notify RC
1813          *
1814          * @param Title $dest the destination of the redirect
1815          * @param string $comment the comment string describing the move
1816          * @return bool true on success
1817          * @access public
1818          */
1819         function createRedirect( $dest, $comment ) {
1820                 global $wgUser;
1821                 if ( $this->getArticleID() ) {
1822                         return false;
1823                 }
1824
1825                 $fname = 'Title::createRedirect';
1826                 $dbw =& wfGetDB( DB_MASTER );
1827
1828                 $article = new Article( $this );
1829                 $newid = $article->insertOn( $dbw );
1830                 $revision = new Revision( array(
1831                         'page'      => $newid,
1832                         'comment'   => $comment,
1833                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1834                         ) );
1835                 $revisionId = $revision->insertOn( $dbw );
1836                 $article->updateRevisionOn( $dbw, $revision, 0 );
1837
1838                 # Link table
1839                 if ( $dest->getArticleID() ) {
1840                         $dbw->insert( 'links',
1841                                 array(
1842                                         'l_to' => $dest->getArticleID(),
1843                                         'l_from' => $newid
1844                                 ), $fname
1845                         );
1846                 } else {
1847                         $dbw->insert( 'brokenlinks',
1848                                 array(
1849                                         'bl_to' => $dest->getPrefixedDBkey(),
1850                                         'bl_from' => $newid
1851                                 ), $fname
1852                         );
1853                 }
1854
1855                 Article::onArticleCreate( $this );
1856                 return true;
1857         }
1858
1859         /**
1860          * Get categories to which this Title belongs and return an array of
1861          * categories' names.
1862          *
1863          * @return array an array of parents in the form:
1864          *      $parent => $currentarticle
1865          * @access public
1866          */
1867         function getParentCategories() {
1868                 global $wgContLang,$wgUser;
1869
1870                 $titlekey = $this->getArticleId();
1871                 $sk =& $wgUser->getSkin();
1872                 $parents = array();
1873                 $dbr =& wfGetDB( DB_SLAVE );
1874                 $categorylinks = $dbr->tableName( 'categorylinks' );
1875
1876                 # NEW SQL
1877                 $sql = "SELECT * FROM $categorylinks"
1878                      ." WHERE cl_from='$titlekey'"
1879                          ." AND cl_from <> '0'"
1880                          ." ORDER BY cl_sortkey";
1881
1882                 $res = $dbr->query ( $sql ) ;
1883
1884                 if($dbr->numRows($res) > 0) {
1885                         while ( $x = $dbr->fetchObject ( $res ) )
1886                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1887                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1888                         $dbr->freeResult ( $res ) ;
1889                 } else {
1890                         $data = '';
1891                 }
1892                 return $data;
1893         }
1894
1895         /**
1896          * Get a tree of parent categories
1897          * @param array $children an array with the children in the keys, to check for circular refs
1898          * @return array
1899          * @access public
1900          */
1901         function getParentCategoryTree( $children = array() ) {
1902                 $parents = $this->getParentCategories();
1903
1904                 if($parents != '') {
1905                         foreach($parents as $parent => $current)
1906                         {
1907                                 if ( array_key_exists( $parent, $children ) ) {
1908                                         # Circular reference
1909                                         $stack[$parent] = array();
1910                                 } else {
1911                                         $nt = Title::newFromText($parent);
1912                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1913                                 }
1914                         }
1915                         return $stack;
1916                 } else {
1917                         return array();
1918                 }
1919         }
1920
1921
1922         /**
1923          * Get an associative array for selecting this title from
1924          * the "cur" table
1925          *
1926          * @return array
1927          * @access public
1928          */
1929         function curCond() {
1930                 wfDebugDieBacktrace( 'curCond called' );
1931                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1932         }
1933
1934         /**
1935          * Get an associative array for selecting this title from the
1936          * "old" table
1937          *
1938          * @return array
1939          * @access public
1940          */
1941         function oldCond() {
1942                 wfDebugDieBacktrace( 'oldCond called' );
1943                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1944         }
1945
1946         /**
1947          * Get the revision ID of the previous revision
1948          *
1949          * @param integer $revision  Revision ID. Get the revision that was before this one.
1950          * @return interger $oldrevision|false
1951          */
1952         function getPreviousRevisionID( $revision ) {
1953                 $dbr =& wfGetDB( DB_SLAVE );
1954                 return $dbr->selectField( 'revision', 'rev_id',
1955                         'rev_page=' . IntVal( $this->getArticleId() ) .
1956                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1957         }
1958
1959         /**
1960          * Get the revision ID of the next revision
1961          *
1962          * @param integer $revision  Revision ID. Get the revision that was after this one.
1963          * @return interger $oldrevision|false
1964          */
1965         function getNextRevisionID( $revision ) {
1966                 $dbr =& wfGetDB( DB_SLAVE );
1967                 return $dbr->selectField( 'revision', 'rev_id',
1968                         'rev_page=' . IntVal( $this->getArticleId() ) .
1969                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1970         }
1971
1972         /**
1973          * Compare with another title.
1974          *
1975          * @param Title $title
1976          * @return bool
1977          */
1978         function equals( &$title ) {
1979                 return $this->getInterwiki() == $title->getInterwiki()
1980                         && $this->getNamespace() == $title->getNamespace()
1981                         && $this->getDbkey() == $title->getDbkey();
1982         }
1983
1984         /**
1985          * Check if page exists
1986          * @return bool
1987          */
1988         function exists() {
1989                 return $this->getArticleId() != 0;
1990         }
1991
1992 }
1993 ?>