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                 return $n == '' ? $title : "$n:$title";
 380         }
 381
 382         /**
 383          * Returns the URL associated with an interwiki prefix
 384          * @param string $key the interwiki prefix (e.g. "MeatBall")
 385          * @return the associated URL, containing "$1", which should be
 386          *      replaced by an article title
 387          * @static (arguably)
 388          * @access public
 389          */
 390         function getInterwikiLink( $key ) {
 391                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 392                 $fname = 'Title::getInterwikiLink';
 393
 394                 wfProfileIn( $fname );
 395
 396                 $k = $wgDBname.':interwiki:'.$key;
 397                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 398                         wfProfileOut( $fname );
 399                         return $wgTitleInterwikiCache[$k]->iw_url;
 400                 }
 401
 402                 $s = $wgMemc->get( $k );
 403                 # Ignore old keys with no iw_local
 404                 if( $s && isset( $s->iw_local ) ) {
 405                         $wgTitleInterwikiCache[$k] = $s;
 406                         wfProfileOut( $fname );
 407                         return $s->iw_url;
 408                 }
 409
 410                 $dbr =& wfGetDB( DB_SLAVE );
 411                 $res = $dbr->select( 'interwiki',
 412                         array( 'iw_url', 'iw_local' ),
 413                         array( 'iw_prefix' => $key ), $fname );
 414                 if( !$res ) {
 415                         wfProfileOut( $fname );
 416                         return '';
 417                 }
 418
 419                 $s = $dbr->fetchObject( $res );
 420                 if( !$s ) {
 421                         # Cache non-existence: create a blank object and save it to memcached
 422                         $s = (object)false;
 423                         $s->iw_url = '';
 424                         $s->iw_local = 0;
 425                 }
 426                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 427                 $wgTitleInterwikiCache[$k] = $s;
 428
 429                 wfProfileOut( $fname );
 430                 return $s->iw_url;
 431         }
 432
 433         /**
 434          * Determine whether the object refers to a page within
 435          * this project.
 436          *
 437          * @return bool TRUE if this is an in-project interwiki link
 438          *      or a wikilink, FALSE otherwise
 439          * @access public
 440          */
 441         function isLocal() {
 442                 global $wgTitleInterwikiCache, $wgDBname;
 443
 444                 if ( $this->mInterwiki != '' ) {
 445                         # Make sure key is loaded into cache
 446                         $this->getInterwikiLink( $this->mInterwiki );
 447                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 448                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 449                 } else {
 450                         return true;
 451                 }
 452         }
 453
 454         /**
 455          * Update the page_touched field for an array of title objects
 456          * @todo Inefficient unless the IDs are already loaded into the
 457          *      link cache
 458          * @param array $titles an array of Title objects to be touched
 459          * @param string $timestamp the timestamp to use instead of the
 460          *      default current time
 461          * @static
 462          * @access public
 463          */
 464         /* static */ function touchArray( $titles, $timestamp = '' ) {
 465                 if ( count( $titles ) == 0 ) {
 466                         return;
 467                 }
 468                 $dbw =& wfGetDB( DB_MASTER );
 469                 if ( $timestamp == '' ) {
 470                         $timestamp = $dbw->timestamp();
 471                 }
 472                 $page = $dbw->tableName( 'page' );
 473                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 474                 $first = true;
 475
 476                 foreach ( $titles as $title ) {
 477                         if ( ! $first ) {
 478                                 $sql .= ',';
 479                         }
 480                         $first = false;
 481                         $sql .= $title->getArticleID();
 482                 }
 483                 $sql .= ')';
 484                 if ( ! $first ) {
 485                         $dbw->query( $sql, 'Title::touchArray' );
 486                 }
 487         }
 488
 489 #----------------------------------------------------------------------------
 490 #       Other stuff
 491 #----------------------------------------------------------------------------
 492
 493         /** Simple accessors */
 494         /**
 495          * Get the text form (spaces not underscores) of the main part
 496          * @return string
 497          * @access public
 498          */
 499         function getText() { return $this->mTextform; }
 500         /**
 501          * Get the URL-encoded form of the main part
 502          * @return string
 503          * @access public
 504          */
 505         function getPartialURL() { return $this->mUrlform; }
 506         /**
 507          * Get the main part with underscores
 508          * @return string
 509          * @access public
 510          */
 511         function getDBkey() { return $this->mDbkeyform; }
 512         /**
 513          * Get the namespace index, i.e. one of the NS_xxxx constants
 514          * @return int
 515          * @access public
 516          */
 517         function getNamespace() { return $this->mNamespace; }
 518         /**
 519          * Get the interwiki prefix (or null string)
 520          * @return string
 521          * @access public
 522          */
 523         function getInterwiki() { return $this->mInterwiki; }
 524         /**
 525          * Get the Title fragment (i.e. the bit after the #)
 526          * @return string
 527          * @access public
 528          */
 529         function getFragment() { return $this->mFragment; }
 530         /**
 531          * Get the default namespace index, for when there is no namespace
 532          * @return int
 533          * @access public
 534          */
 535         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 536
 537         /**
 538          * Get title for search index
 539          * @return string a stripped-down title string ready for the
 540          *      search index
 541          */
 542         function getIndexTitle() {
 543                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 544         }
 545
 546         /**
 547          * Get the prefixed database key form
 548          * @return string the prefixed title, with underscores and
 549          *      any interwiki and namespace prefixes
 550          * @access public
 551          */
 552         function getPrefixedDBkey() {
 553                 $s = $this->prefix( $this->mDbkeyform );
 554                 $s = str_replace( ' ', '_', $s );
 555                 return $s;
 556         }
 557
 558         /**
 559          * Get the prefixed title with spaces.
 560          * This is the form usually used for display
 561          * @return string the prefixed title, with spaces
 562          * @access public
 563          */
 564         function getPrefixedText() {
 565                 global $wgContLang;
 566                 if ( empty( $this->mPrefixedText ) ) {
 567                         $s = $this->prefix( $this->mTextform );
 568                         $s = str_replace( '_', ' ', $s );
 569                         $this->mPrefixedText = $s;
 570                 }
 571                 return $this->mPrefixedText;
 572         }
 573
 574         /**
 575          * Get the prefixed title with spaces, plus any fragment
 576          * (part beginning with '#')
 577          * @return string the prefixed title, with spaces and
 578          *      the fragment, including '#'
 579          * @access public
 580          */
 581         function getFullText() {
 582                 global $wgContLang;
 583                 $text = $this->getPrefixedText();
 584                 if( '' != $this->mFragment ) {
 585                         $text .= '#' . $this->mFragment;
 586                 }
 587                 return $text;
 588         }
 589
 590         /**
 591          * Get a URL-encoded title (not an actual URL) including interwiki
 592          * @return string the URL-encoded form
 593          * @access public
 594          */
 595         function getPrefixedURL() {
 596                 $s = $this->prefix( $this->mDbkeyform );
 597                 $s = str_replace( ' ', '_', $s );
 598
 599                 $s = wfUrlencode ( $s ) ;
 600
 601                 # Cleaning up URL to make it look nice -- is this safe?
 602                 $s = str_replace( '%28', '(', $s );
 603                 $s = str_replace( '%29', ')', $s );
 604
 605                 return $s;
 606         }
 607
 608         /**
 609          * Get a real URL referring to this title, with interwiki link and
 610          * fragment
 611          *
 612          * @param string $query an optional query string, not used
 613          *      for interwiki links
 614          * @return string the URL
 615          * @access public
 616          */
 617         function getFullURL( $query = '' ) {
 618                 global $wgContLang, $wgServer, $wgScript;
 619
 620                 if ( '' == $this->mInterwiki ) {
 621                         return $wgServer . $this->getLocalUrl( $query );
 622                 } else {
 623                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 624                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 625                         if ( '' != $namespace ) {
 626                                 # Can this actually happen? Interwikis shouldn't be parsed.
 627                                 $namepace .= ':';
 628                         }
 629                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 630                         if( $query != '' ) {
 631                                 if( false === strpos( $url, '?' ) ) {
 632                                         $url .= '?';
 633                                 } else {
 634                                         $url .= '&';
 635                                 }
 636                                 $url .= $query;
 637                         }
 638                         if ( '' != $this->mFragment ) {
 639                                 $url .= '#' . $this->mFragment;
 640                         }
 641                         return $url;
 642                 }
 643         }
 644
 645         /**
 646          * Get a relative directory for putting an HTML version of this article into
 647          */
 648         function getHashedDirectory() {
 649                 $dbkey = $this->getPrefixedDBkey();
 650                 if ( strlen( $dbkey ) < 2 ) {
 651                         $dbkey = sprintf( "%2s", $dbkey );
 652                 }
 653                 $dir = '';
 654                 for ( $i=0; $i<=1; $i++ ) {
 655                         if ( $i ) {
 656                                 $dir .= '/';
 657                         }
 658                         if ( ord( $dbkey{$i} ) < 128 && ord( $dbkey{$i} ) > 32 ) {
 659                                 $dir .= strtolower( $dbkey{$i} );
 660                         } else {
 661                                 $dir .= sprintf( "%02X", ord( $dbkey{$i} ) );
 662                         }
 663                 }
 664                 return $dir;
 665         }
 666
 667         function getHashedFilename() {
 668                 $dbkey = $this->getPrefixedDBkey();
 669                 $dir = $this->getHashedDirectory();
 670                 $friendlyName = strtr( $dbkey, '/\\:*?"<>|', '_________' );
 671                 return "$dir/$friendlyName.html";
 672         }
 673
 674         /**
 675          * Get a URL with no fragment or server name
 676          * @param string $query an optional query string; if not specified,
 677          *      $wgArticlePath will be used.
 678          * @return string the URL
 679          * @access public
 680          */
 681         function getLocalURL( $query = '' ) {
 682                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks;
 683
 684                 if ( $this->isExternal() ) {
 685                         return $this->getFullURL();
 686                 }
 687
 688                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 689                 if ( $wgMakeDumpLinks ) {
 690                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 691                 } elseif ( $query == '' ) {
 692                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 693                 } else {
 694                         if( preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 695                                 global $wgActionPaths;
 696                                 $action = urldecode( $matches[2] );
 697                                 if( isset( $wgActionPaths[$action] ) ) {
 698                                         $query = $matches[1];
 699                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 700                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 701                                         if( $query != '' ) $url .= '?' . $query;
 702                                         return $url;
 703                                 }
 704                         }
 705                         if ( $query == '-' ) {
 706                                 $query = '';
 707                         }
 708                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 709                 }
 710                 return $url;
 711         }
 712
 713         /**
 714          * Get an HTML-escaped version of the URL form, suitable for
 715          * using in a link, without a server name or fragment
 716          * @param string $query an optional query string
 717          * @return string the URL
 718          * @access public
 719          */
 720         function escapeLocalURL( $query = '' ) {
 721                 return htmlspecialchars( $this->getLocalURL( $query ) );
 722         }
 723
 724         /**
 725          * Get an HTML-escaped version of the URL form, suitable for
 726          * using in a link, including the server name and fragment
 727          *
 728          * @return string the URL
 729          * @param string $query an optional query string
 730          * @access public
 731          */
 732         function escapeFullURL( $query = '' ) {
 733                 return htmlspecialchars( $this->getFullURL( $query ) );
 734         }
 735
 736         /**
 737          * Get the URL form for an internal link.
 738          * - Used in various Squid-related code, in case we have a different
 739          * internal hostname for the server from the exposed one.
 740          *
 741          * @param string $query an optional query string
 742          * @return string the URL
 743          * @access public
 744          */
 745         function getInternalURL( $query = '' ) {
 746                 global $wgInternalServer;
 747                 return $wgInternalServer . $this->getLocalURL( $query );
 748         }
 749
 750         /**
 751          * Get the edit URL for this Title
 752          * @return string the URL, or a null string if this is an
 753          *      interwiki link
 754          * @access public
 755          */
 756         function getEditURL() {
 757                 global $wgServer, $wgScript;
 758
 759                 if ( '' != $this->mInterwiki ) { return ''; }
 760                 $s = $this->getLocalURL( 'action=edit' );
 761
 762                 return $s;
 763         }
 764
 765         /**
 766          * Get the HTML-escaped displayable text form.
 767          * Used for the title field in <a> tags.
 768          * @return string the text, including any prefixes
 769          * @access public
 770          */
 771         function getEscapedText() {
 772                 return htmlspecialchars( $this->getPrefixedText() );
 773         }
 774
 775         /**
 776          * Is this Title interwiki?
 777          * @return boolean
 778          * @access public
 779          */
 780         function isExternal() { return ( '' != $this->mInterwiki ); }
 781
 782         /**
 783          * Does the title correspond to a protected article?
 784          * @param string $what the action the page is protected from,
 785          *      by default checks move and edit
 786          * @return boolean
 787          * @access public
 788          */
 789         function isProtected($action = '') {
 790                 if ( -1 == $this->mNamespace ) { return true; }
 791                 if($action == 'edit' || $action == '') {
 792                         $a = $this->getRestrictions("edit");
 793                         if ( in_array( 'sysop', $a ) ) { return true; }
 794                 }
 795                 if($action == 'move' || $action == '') {
 796                         $a = $this->getRestrictions("move");
 797                         if ( in_array( 'sysop', $a ) ) { return true; }
 798                 }
 799                 return false;
 800         }
 801
 802         /**
 803          * Is $wgUser is watching this page?
 804          * @return boolean
 805          * @access public
 806          */
 807         function userIsWatching() {
 808                 global $wgUser;
 809
 810                 if ( -1 == $this->mNamespace ) { return false; }
 811                 if ( 0 == $wgUser->getID() ) { return false; }
 812
 813                 return $wgUser->isWatched( $this );
 814         }
 815
 816         /**
 817          * Is $wgUser perform $action this page?
 818          * @param string $action action that permission needs to be checked for
 819          * @return boolean
 820          * @access private
 821          */
 822         function userCan($action) {
 823                 $fname = 'Title::userCanEdit';
 824                 wfProfileIn( $fname );
 825
 826                 global $wgUser;
 827                 if( NS_SPECIAL == $this->mNamespace ) {
 828                         wfProfileOut( $fname );
 829                         return false;
 830                 }
 831                 if( NS_MEDIAWIKI == $this->mNamespace &&
 832                     !$wgUser->isAllowed('editinterface') ) {
 833                         wfProfileOut( $fname );
 834                         return false;
 835                 }
 836                 if( $this->mDbkeyform == '_' ) {
 837                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 838                         wfProfileOut( $fname );
 839                         return false;
 840                 }
 841
 842                 # protect global styles and js
 843                 if ( NS_MEDIAWIKI == $this->mNamespace
 844                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 845                      && !$wgUser->isAllowed('editinterface') ) {
 846                         wfProfileOut( $fname );
 847                         return false;
 848                 }
 849
 850                 # protect css/js subpages of user pages
 851                 # XXX: this might be better using restrictions
 852                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 853                 if( NS_USER == $this->mNamespace
 854                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 855                         && !$wgUser->isAllowed('editinterface')
 856                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 857                         wfProfileOut( $fname );
 858                         return false;
 859                 }
 860
 861                 foreach( $this->getRestrictions($action) as $right ) {
 862                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 863                                 wfProfileOut( $fname );
 864                                 return false;
 865                         }
 866                 }
 867
 868                 if( $action == 'move' && !$this->isMovable() ) {
 869                         wfProfileOut( $fname );
 870                         return false;
 871                 }
 872
 873                 wfProfileOut( $fname );
 874                 return true;
 875         }
 876
 877         /**
 878          * Can $wgUser edit this page?
 879          * @return boolean
 880          * @access public
 881          */
 882         function userCanEdit() {
 883                 return $this->userCan('edit');
 884         }
 885
 886         /**
 887          * Can $wgUser move this page?
 888          * @return boolean
 889          * @access public
 890          */
 891         function userCanMove() {
 892                 return $this->userCan('move');
 893         }
 894
 895         /**
 896          * Would anybody with sufficient privileges be able to move this page?
 897          * Some pages just aren't movable.
 898          *
 899          * @return boolean
 900          * @access public
 901          */
 902         function isMovable() {
 903                 return Namespace::isMovable( $this->getNamespace() )
 904                         && $this->getInterwiki() == '';
 905         }
 906
 907         /**
 908          * Can $wgUser read this page?
 909          * @return boolean
 910          * @access public
 911          */
 912         function userCanRead() {
 913                 global $wgUser;
 914
 915                 if( $wgUser->isAllowed('read') ) {
 916                         return true;
 917                 } else {
 918                         global $wgWhitelistRead;
 919
 920                         /** If anon users can create an account,
 921                             they need to reach the login page first! */
 922                         if( $wgUser->isAllowed( 'createaccount' )
 923                             && $this->mId == NS_SPECIAL
 924                             && $this->getText() == 'Userlogin' ) {
 925                                 return true;
 926                         }
 927
 928                         /** some pages are explicitly allowed */
 929                         $name = $this->getPrefixedText();
 930                         if( in_array( $name, $wgWhitelistRead ) ) {
 931                                 return true;
 932                         }
 933
 934                         # Compatibility with old settings
 935                         if( $this->getNamespace() == NS_MAIN ) {
 936                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 937                                         return true;
 938                                 }
 939                         }
 940                 }
 941                 return false;
 942         }
 943
 944         /**
 945          * Is this a talk page of some sort?
 946          * @return bool
 947          * @access public
 948          */
 949         function isTalkPage() {
 950                 return Namespace::isTalk( $this->getNamespace() );
 951         }
 952
 953         /**
 954          * Is this a .css or .js subpage of a user page?
 955          * @return bool
 956          * @access public
 957          */
 958         function isCssJsSubpage() {
 959                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 960         }
 961         /**
 962          * Is this a .css subpage of a user page?
 963          * @return bool
 964          * @access public
 965          */
 966         function isCssSubpage() {
 967                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 968         }
 969         /**
 970          * Is this a .js subpage of a user page?
 971          * @return bool
 972          * @access public
 973          */
 974         function isJsSubpage() {
 975                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 976         }
 977         /**
 978          * Protect css/js subpages of user pages: can $wgUser edit
 979          * this page?
 980          *
 981          * @return boolean
 982          * @todo XXX: this might be better using restrictions
 983          * @access public
 984          */
 985         function userCanEditCssJsSubpage() {
 986                 global $wgUser;
 987                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 988         }
 989
 990         /**
 991          * Loads a string into mRestrictions array
 992          * @param string $res restrictions in string format
 993          * @access public
 994          */
 995         function loadRestrictions( $res ) {
 996                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 997                         $temp = explode( '=', trim( $restrict ) );
 998                         if(count($temp) == 1) {
 999                                 // old format should be treated as edit/move restriction
1000                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1001                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1002                         } else {
1003                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1004                         }
1005                 }
1006                 $this->mRestrictionsLoaded = true;
1007         }
1008
1009         /**
1010          * Accessor/initialisation for mRestrictions
1011          * @param string $action action that permission needs to be checked for
1012          * @return array the array of groups allowed to edit this article
1013          * @access public
1014          */
1015         function getRestrictions($action) {
1016                 $id = $this->getArticleID();
1017                 if ( 0 == $id ) { return array(); }
1018
1019                 if ( ! $this->mRestrictionsLoaded ) {
1020                         $dbr =& wfGetDB( DB_SLAVE );
1021                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1022                         $this->loadRestrictions( $res );
1023                 }
1024                 if( isset( $this->mRestrictions[$action] ) ) {
1025                         return $this->mRestrictions[$action];
1026                 }
1027                 return array();
1028         }
1029
1030         /**
1031          * Is there a version of this page in the deletion archive?
1032          * @return int the number of archived revisions
1033          * @access public
1034          */
1035         function isDeleted() {
1036                 $fname = 'Title::isDeleted';
1037                 $dbr =& wfGetDB( DB_SLAVE );
1038                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1039                         'ar_title' => $this->getDBkey() ), $fname );
1040                 return (int)$n;
1041         }
1042
1043         /**
1044          * Get the article ID for this Title from the link cache,
1045          * adding it if necessary
1046          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1047          *      for update
1048          * @return int the ID
1049          * @access public
1050          */
1051         function getArticleID( $flags = 0 ) {
1052                 global $wgLinkCache;
1053
1054                 if ( $flags & GAID_FOR_UPDATE ) {
1055                         $oldUpdate = $wgLinkCache->forUpdate( true );
1056                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1057                         $wgLinkCache->forUpdate( $oldUpdate );
1058                 } else {
1059                         if ( -1 == $this->mArticleID ) {
1060                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1061                         }
1062                 }
1063                 return $this->mArticleID;
1064         }
1065
1066         /**
1067          * This clears some fields in this object, and clears any associated
1068          * keys in the "bad links" section of $wgLinkCache.
1069          *
1070          * - This is called from Article::insertNewArticle() to allow
1071          * loading of the new page_id. It's also called from
1072          * Article::doDeleteArticle()
1073          *
1074          * @param int $newid the new Article ID
1075          * @access public
1076          */
1077         function resetArticleID( $newid ) {
1078                 global $wgLinkCache;
1079                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1080
1081                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1082                 else { $this->mArticleID = $newid; }
1083                 $this->mRestrictionsLoaded = false;
1084                 $this->mRestrictions = array();
1085         }
1086
1087         /**
1088          * Updates page_touched for this page; called from LinksUpdate.php
1089          * @return bool true if the update succeded
1090          * @access public
1091          */
1092         function invalidateCache() {
1093                 if ( wfReadOnly() ) {
1094                         return;
1095                 }
1096
1097                 $now = wfTimestampNow();
1098                 $dbw =& wfGetDB( DB_MASTER );
1099                 $success = $dbw->update( 'page',
1100                         array( /* SET */
1101                                 'page_touched' => $dbw->timestamp()
1102                         ), array( /* WHERE */
1103                                 'page_namespace' => $this->getNamespace() ,
1104                                 'page_title' => $this->getDBkey()
1105                         ), 'Title::invalidateCache'
1106                 );
1107                 return $success;
1108         }
1109
1110         /**
1111          * Prefix some arbitrary text with the namespace or interwiki prefix
1112          * of this object
1113          *
1114          * @param string $name the text
1115          * @return string the prefixed text
1116          * @access private
1117          */
1118         /* private */ function prefix( $name ) {
1119                 global $wgContLang;
1120
1121                 $p = '';
1122                 if ( '' != $this->mInterwiki ) {
1123                         $p = $this->mInterwiki . ':';
1124                 }
1125                 if ( 0 != $this->mNamespace ) {
1126                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1127                 }
1128                 return $p . $name;
1129         }
1130
1131         /**
1132          * Secure and split - main initialisation function for this object
1133          *
1134          * Assumes that mDbkeyform has been set, and is urldecoded
1135          * and uses underscores, but not otherwise munged.  This function
1136          * removes illegal characters, splits off the interwiki and
1137          * namespace prefixes, sets the other forms, and canonicalizes
1138          * everything.
1139          * @return bool true on success
1140          * @access private
1141          */
1142         /* private */ function secureAndSplit() {
1143                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1144                 $fname = 'Title::secureAndSplit';
1145                 wfProfileIn( $fname );
1146
1147                 # Initialisation
1148                 static $rxTc = false;
1149                 if( !$rxTc ) {
1150                         # % is needed as well
1151                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1152                 }
1153
1154                 $this->mInterwiki = $this->mFragment = '';
1155                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1156
1157                 # Clean up whitespace
1158                 #
1159                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1160                 $t = trim( $t, '_' );
1161
1162                 if ( '' == $t ) {
1163                         wfProfileOut( $fname );
1164                         return false;
1165                 }
1166
1167                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1168                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1169                         wfProfileOut( $fname );
1170                         return false;
1171                 }
1172
1173                 $this->mDbkeyform = $t;
1174
1175                 # Initial colon indicating main namespace
1176                 if ( ':' == $t{0} ) {
1177                         $r = substr( $t, 1 );
1178                         $this->mNamespace = NS_MAIN;
1179                 } else {
1180                         # Namespace or interwiki prefix
1181                         $firstPass = true;
1182                         do {
1183                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1184                                         $p = $m[1];
1185                                         $lowerNs = strtolower( $p );
1186                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1187                                                 # Canonical namespace
1188                                                 $t = $m[2];
1189                                                 $this->mNamespace = $ns;
1190                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1191                                                 # Ordinary namespace
1192                                                 $t = $m[2];
1193                                                 $this->mNamespace = $ns;
1194                                         } elseif( $this->getInterwikiLink( $p ) ) {
1195                                                 if( !$firstPass ) {
1196                                                         # Can't make a local interwiki link to an interwiki link.
1197                                                         # That's just crazy!
1198                                                         wfProfileOut( $fname );
1199                                                         return false;
1200                                                 }
1201
1202                                                 # Interwiki link
1203                                                 $t = $m[2];
1204                                                 $this->mInterwiki = $p;
1205
1206                                                 # Redundant interwiki prefix to the local wiki
1207                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1208                                                         if( $t == '' ) {
1209                                                                 # Can't have an empty self-link
1210                                                                 wfProfileOut( $fname );
1211                                                                 return false;
1212                                                         }
1213                                                         $this->mInterwiki = '';
1214                                                         $firstPass = false;
1215                                                         # Do another namespace split...
1216                                                         continue;
1217                                                 }
1218                                         }
1219                                         # If there's no recognized interwiki or namespace,
1220                                         # then let the colon expression be part of the title.
1221                                 }
1222                                 break;
1223                         } while( true );
1224                         $r = $t;
1225                 }
1226
1227                 # We already know that some pages won't be in the database!
1228                 #
1229                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1230                         $this->mArticleID = 0;
1231                 }
1232                 $f = strstr( $r, '#' );
1233                 if ( false !== $f ) {
1234                         $this->mFragment = substr( $f, 1 );
1235                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1236                         # remove whitespace again: prevents "Foo_bar_#"
1237                         # becoming "Foo_bar_"
1238                         $r = preg_replace( '/_*$/', '', $r );
1239                 }
1240
1241                 # Reject illegal characters.
1242                 #
1243                 if( preg_match( $rxTc, $r ) ) {
1244                         wfProfileOut( $fname );
1245                         return false;
1246                 }
1247
1248                 /**
1249                  * Pages with "/./" or "/../" appearing in the URLs will
1250                  * often be unreachable due to the way web browsers deal
1251                  * with 'relative' URLs. Forbid them explicitly.
1252                  */
1253                 if ( strpos( $r, '.' ) !== false &&
1254                      ( $r === '.' || $r === '..' ||
1255                        strpos( $r, './' ) === 0  ||
1256                        strpos( $r, '../' ) === 0 ||
1257                        strpos( $r, '/./' ) !== false ||
1258                        strpos( $r, '/../' ) !== false ) )
1259                 {
1260                         wfProfileOut( $fname );
1261                         return false;
1262                 }
1263
1264                 # We shouldn't need to query the DB for the size.
1265                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1266                 if ( strlen( $r ) > 255 ) {
1267                         wfProfileOut( $fname );
1268                         return false;
1269                 }
1270
1271                 /**
1272                  * Normally, all wiki links are forced to have
1273                  * an initial capital letter so [[foo]] and [[Foo]]
1274                  * point to the same place.
1275                  *
1276                  * Don't force it for interwikis, since the other
1277                  * site might be case-sensitive.
1278                  */
1279                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1280                         $t = $wgContLang->ucfirst( $r );
1281                 } else {
1282                         $t = $r;
1283                 }
1284
1285                 /**
1286                  * Can't make a link to a namespace alone...
1287                  * "empty" local links can only be self-links
1288                  * with a fragment identifier.
1289                  */
1290                 if( $t == '' &&
1291                         $this->mInterwiki == '' &&
1292                         $this->mNamespace != NS_MAIN ) {
1293                         wfProfileOut( $fname );
1294                         return false;
1295                 }
1296
1297                 # Fill fields
1298                 $this->mDbkeyform = $t;
1299                 $this->mUrlform = wfUrlencode( $t );
1300
1301                 $this->mTextform = str_replace( '_', ' ', $t );
1302
1303                 wfProfileOut( $fname );
1304                 return true;
1305         }
1306
1307         /**
1308          * Get a Title object associated with the talk page of this article
1309          * @return Title the object for the talk page
1310          * @access public
1311          */
1312         function getTalkPage() {
1313                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1314         }
1315
1316         /**
1317          * Get a title object associated with the subject page of this
1318          * talk page
1319          *
1320          * @return Title the object for the subject page
1321          * @access public
1322          */
1323         function getSubjectPage() {
1324                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1325         }
1326
1327         /**
1328          * Get an array of Title objects linking to this Title
1329          * - Also stores the IDs in the link cache.
1330          *
1331          * @param string $options may be FOR UPDATE
1332          * @return array the Title objects linking here
1333          * @access public
1334          */
1335         function getLinksTo( $options = '' ) {
1336                 global $wgLinkCache;
1337                 $id = $this->getArticleID();
1338
1339                 if ( $options ) {
1340                         $db =& wfGetDB( DB_MASTER );
1341                 } else {
1342                         $db =& wfGetDB( DB_SLAVE );
1343                 }
1344                 $page = $db->tableName( 'page' );
1345                 $links = $db->tableName( 'links' );
1346
1347                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1348                 $res = $db->query( $sql, 'Title::getLinksTo' );
1349                 $retVal = array();
1350                 if ( $db->numRows( $res ) ) {
1351                         while ( $row = $db->fetchObject( $res ) ) {
1352                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1353                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1354                                         $retVal[] = $titleObj;
1355                                 }
1356                         }
1357                 }
1358                 $db->freeResult( $res );
1359                 return $retVal;
1360         }
1361
1362         /**
1363          * Get an array of Title objects linking to this non-existent title.
1364          * - Also stores the IDs in the link cache.
1365          *
1366          * @param string $options may be FOR UPDATE
1367          * @return array the Title objects linking here
1368          * @access public
1369          */
1370         function getBrokenLinksTo( $options = '' ) {
1371                 global $wgLinkCache;
1372
1373                 if ( $options ) {
1374                         $db =& wfGetDB( DB_MASTER );
1375                 } else {
1376                         $db =& wfGetDB( DB_SLAVE );
1377                 }
1378                 $page = $db->tableName( 'page' );
1379                 $brokenlinks = $db->tableName( 'brokenlinks' );
1380                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1381
1382                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1383                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1384                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1385                 $retVal = array();
1386                 if ( $db->numRows( $res ) ) {
1387                         while ( $row = $db->fetchObject( $res ) ) {
1388                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1389                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1390                                 $retVal[] = $titleObj;
1391                         }
1392                 }
1393                 $db->freeResult( $res );
1394                 return $retVal;
1395         }
1396
1397
1398         /**
1399          * Get an array of Title objects referring to non-existent articles linked from this page
1400          *
1401          * @param string $options may be FOR UPDATE
1402          * @return array the Title objects
1403          * @access public
1404          */
1405         function getBrokenLinksFrom( $options = '' ) {
1406                 global $wgLinkCache;
1407
1408                 if ( $options ) {
1409                         $db =& wfGetDB( DB_MASTER );
1410                 } else {
1411                         $db =& wfGetDB( DB_SLAVE );
1412                 }
1413                 $page = $db->tableName( 'page' );
1414                 $brokenlinks = $db->tableName( 'brokenlinks' );
1415                 $id = $this->getArticleID();
1416
1417                 $sql = "SELECT bl_to FROM $brokenlinks WHERE bl_from=$id $options";
1418                 $res = $db->query( $sql, "Title::getBrokenLinksFrom" );
1419                 $retVal = array();
1420                 if ( $db->numRows( $res ) ) {
1421                         while ( $row = $db->fetchObject( $res ) ) {
1422                                 $retVal[] = Title::newFromText( $row->bl_to );
1423                         }
1424                 }
1425                 $db->freeResult( $res );
1426                 return $retVal;
1427         }
1428
1429
1430         /**
1431          * Get a list of URLs to purge from the Squid cache when this
1432          * page changes
1433          *
1434          * @return array the URLs
1435          * @access public
1436          */
1437         function getSquidURLs() {
1438                 return array(
1439                         $this->getInternalURL(),
1440                         $this->getInternalURL( 'action=history' )
1441                 );
1442         }
1443
1444         /**
1445          * Move this page without authentication
1446          * @param Title &$nt the new page Title
1447          * @access public
1448          */
1449         function moveNoAuth( &$nt ) {
1450                 return $this->moveTo( $nt, false );
1451         }
1452
1453         /**
1454          * Check whether a given move operation would be valid.
1455          * Returns true if ok, or a message key string for an error message
1456          * if invalid. (Scarrrrry ugly interface this.)
1457          * @param Title &$nt the new title
1458          * @param bool $auth indicates whether $wgUser's permissions
1459          *      should be checked
1460          * @return mixed true on success, message name on failure
1461          * @access public
1462          */
1463         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1464                 global $wgUser;
1465                 if( !$this or !$nt ) {
1466                         return 'badtitletext';
1467                 }
1468                 if( $this->equals( $nt ) ) {
1469                         return 'selfmove';
1470                 }
1471                 if( !$this->isMovable() || !$nt->isMovable() ) {
1472                         return 'immobile_namespace';
1473                 }
1474
1475                 $fname = 'Title::move';
1476                 $oldid = $this->getArticleID();
1477                 $newid = $nt->getArticleID();
1478
1479                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1480                         return 'articleexists';
1481                 }
1482                 if ( ( '' == $this->getDBkey() ) ||
1483                          ( !$oldid ) ||
1484                      ( '' == $nt->getDBkey() ) ) {
1485                         return 'badarticleerror';
1486                 }
1487
1488                 if ( $auth && (
1489                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1490                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1491                         return 'protectedpage';
1492                 }
1493
1494                 # The move is allowed only if (1) the target doesn't exist, or
1495                 # (2) the target is a redirect to the source, and has no history
1496                 # (so we can undo bad moves right after they're done).
1497
1498                 if ( 0 != $newid ) { # Target exists; check for validity
1499                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1500                                 return 'articleexists';
1501                         }
1502                 }
1503                 return true;
1504         }
1505
1506         /**
1507          * Move a title to a new location
1508          * @param Title &$nt the new title
1509          * @param bool $auth indicates whether $wgUser's permissions
1510          *      should be checked
1511          * @return mixed true on success, message name on failure
1512          * @access public
1513          */
1514         function moveTo( &$nt, $auth = true, $reason = '' ) {
1515                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1516                 if( is_string( $err ) ) {
1517                         return $err;
1518                 }
1519                 if( $nt->exists() ) {
1520                         $this->moveOverExistingRedirect( $nt, $reason );
1521                 } else { # Target didn't exist, do normal move.
1522                         $this->moveToNewTitle( $nt, $newid, $reason );
1523                 }
1524
1525                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1526
1527                 $dbw =& wfGetDB( DB_MASTER );
1528                 $categorylinks = $dbw->tableName( 'categorylinks' );
1529                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1530                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1531                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1532                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1533
1534                 # Update watchlists
1535
1536                 $oldnamespace = $this->getNamespace() & ~1;
1537                 $newnamespace = $nt->getNamespace() & ~1;
1538                 $oldtitle = $this->getDBkey();
1539                 $newtitle = $nt->getDBkey();
1540
1541                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1542                         WatchedItem::duplicateEntries( $this, $nt );
1543                 }
1544
1545                 # Update search engine
1546                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1547                 $u->doUpdate();
1548                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1549                 $u->doUpdate();
1550
1551                 wfRunHooks( 'TitleMoveComplete', array(&$this, &$nt, &$wgUser, $oldid, $newid) );
1552                 return true;
1553         }
1554
1555         /**
1556          * Move page to a title which is at present a redirect to the
1557          * source page
1558          *
1559          * @param Title &$nt the page to move to, which should currently
1560          *      be a redirect
1561          * @access private
1562          */
1563         /* private */ function moveOverExistingRedirect( &$nt, $reason = '' ) {
1564                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1565                 $fname = 'Title::moveOverExistingRedirect';
1566                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1567
1568                 if ( $reason ) {
1569                         $comment .= ": $reason";
1570                 }
1571
1572                 $now = wfTimestampNow();
1573                 $rand = wfRandom();
1574                 $newid = $nt->getArticleID();
1575                 $oldid = $this->getArticleID();
1576                 $dbw =& wfGetDB( DB_MASTER );
1577                 $links = $dbw->tableName( 'links' );
1578
1579                 # Delete the old redirect. We don't save it to history since
1580                 # by definition if we've got here it's rather uninteresting.
1581                 # We have to remove it so that the next step doesn't trigger
1582                 # a conflict on the unique namespace+title index...
1583                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1584
1585                 # Save a null revision in the page's history notifying of the move
1586                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1587                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1588                         true );
1589                 $nullRevId = $nullRevision->insertOn( $dbw );
1590
1591                 # Change the name of the target page:
1592                 $dbw->update( 'page',
1593                         /* SET */ array(
1594                                 'page_touched'   => $dbw->timestamp($now),
1595                                 'page_namespace' => $nt->getNamespace(),
1596                                 'page_title'     => $nt->getDBkey(),
1597                                 'page_latest'    => $nullRevId,
1598                         ),
1599                         /* WHERE */ array( 'page_id' => $oldid ),
1600                         $fname
1601                 );
1602                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1603
1604                 # Recreate the redirect, this time in the other direction.
1605                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1606                 $redirectArticle = new Article( $this );
1607                 $newid = $redirectArticle->insertOn( $dbw );
1608                 $redirectRevision = new Revision( array(
1609                         'page'    => $newid,
1610                         'comment' => $comment,
1611                         'text'    => $redirectText ) );
1612                 $revid = $redirectRevision->insertOn( $dbw );
1613                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1614                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1615
1616                 # Log the move
1617                 $log = new LogPage( 'move' );
1618                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1619
1620                 # Swap links
1621
1622                 # Load titles and IDs
1623                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1624                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1625
1626                 # Delete them all
1627                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1628                 $dbw->query( $sql, $fname );
1629
1630                 # Reinsert
1631                 if ( count( $linksToOld ) || count( $linksToNew )) {
1632                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1633                         $first = true;
1634
1635                         # Insert links to old title
1636                         foreach ( $linksToOld as $linkTitle ) {
1637                                 if ( $first ) {
1638                                         $first = false;
1639                                 } else {
1640                                         $sql .= ',';
1641                                 }
1642                                 $id = $linkTitle->getArticleID();
1643                                 $sql .= "($id,$newid)";
1644                         }
1645
1646                         # Insert links to new title
1647                         foreach ( $linksToNew as $linkTitle ) {
1648                                 if ( $first ) {
1649                                         $first = false;
1650                                 } else {
1651                                         $sql .= ',';
1652                                 }
1653                                 $id = $linkTitle->getArticleID();
1654                                 $sql .= "($id, $oldid)";
1655                         }
1656
1657                         $dbw->query( $sql, $fname );
1658                 }
1659
1660                 # Now, we record the link from the redirect to the new title.
1661                 # It should have no other outgoing links...
1662                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1663                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1664
1665                 # Clear linkscc
1666                 LinkCache::linksccClearLinksTo( $oldid );
1667                 LinkCache::linksccClearLinksTo( $newid );
1668
1669                 # Purge squid
1670                 if ( $wgUseSquid ) {
1671                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1672                         $u = new SquidUpdate( $urls );
1673                         $u->doUpdate();
1674                 }
1675         }
1676
1677         /**
1678          * Move page to non-existing title.
1679          * @param Title &$nt the new Title
1680          * @param int &$newid set to be the new article ID
1681          * @access private
1682          */
1683         /* private */ function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1684                 global $wgUser, $wgLinkCache, $wgUseSquid;
1685                 global $wgMwRedir;
1686                 $fname = 'MovePageForm::moveToNewTitle';
1687                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1688                 if ( $reason ) {
1689                         $comment .= ": $reason";
1690                 }
1691
1692                 $newid = $nt->getArticleID();
1693                 $oldid = $this->getArticleID();
1694                 $dbw =& wfGetDB( DB_MASTER );
1695                 $now = $dbw->timestamp();
1696                 wfSeedRandom();
1697                 $rand = wfRandom();
1698
1699                 # Save a null revision in the page's history notifying of the move
1700                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1701                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1702                         true );
1703                 $nullRevId = $nullRevision->insertOn( $dbw );
1704
1705                 # Rename cur entry
1706                 $dbw->update( 'page',
1707                         /* SET */ array(
1708                                 'page_touched'   => $now,
1709                                 'page_namespace' => $nt->getNamespace(),
1710                                 'page_title'     => $nt->getDBkey(),
1711                                 'page_latest'    => $nullRevId,
1712                         ),
1713                         /* WHERE */ array( 'page_id' => $oldid ),
1714                         $fname
1715                 );
1716
1717                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1718
1719                 # Insert redirect
1720                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1721                 $redirectArticle = new Article( $this );
1722                 $newid = $redirectArticle->insertOn( $dbw );
1723                 $redirectRevision = new Revision( array(
1724                         'page'    => $newid,
1725                         'comment' => $comment,
1726                         'text'    => $redirectText ) );
1727                 $revid = $redirectRevision->insertOn( $dbw );
1728                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1729                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1730
1731                 # Log the move
1732                 $log = new LogPage( 'move' );
1733                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1734
1735                 # Purge squid and linkscc as per article creation
1736                 Article::onArticleCreate( $nt );
1737
1738                 # Any text links to the old title must be reassigned to the redirect
1739                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1740                 LinkCache::linksccClearLinksTo( $oldid );
1741
1742                 # Record the just-created redirect's linking to the page
1743                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1744
1745                 # Non-existent target may have had broken links to it; these must
1746                 # now be removed and made into good links.
1747                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1748                 $update->fixBrokenLinks();
1749
1750                 # Purge old title from squid
1751                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1752                 $titles = $nt->getLinksTo();
1753                 if ( $wgUseSquid ) {
1754                         $urls = $this->getSquidURLs();
1755                         foreach ( $titles as $linkTitle ) {
1756                                 $urls[] = $linkTitle->getInternalURL();
1757                         }
1758                         $u = new SquidUpdate( $urls );
1759                         $u->doUpdate();
1760                 }
1761         }
1762
1763         /**
1764          * Checks if $this can be moved to a given Title
1765          * - Selects for update, so don't call it unless you mean business
1766          *
1767          * @param Title &$nt the new title to check
1768          * @access public
1769          */
1770         function isValidMoveTarget( $nt ) {
1771
1772                 $fname = 'Title::isValidMoveTarget';
1773                 $dbw =& wfGetDB( DB_MASTER );
1774
1775                 # Is it a redirect?
1776                 $id  = $nt->getArticleID();
1777                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1778                         array( 'page_is_redirect','old_text' ),
1779                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1780                         $fname, 'FOR UPDATE' );
1781
1782                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1783                         # Not a redirect
1784                         return false;
1785                 }
1786
1787                 # Does the redirect point to the source?
1788                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1789                         $redirTitle = Title::newFromText( $m[1] );
1790                         if( !is_object( $redirTitle ) ||
1791                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1792                                 return false;
1793                         }
1794                 }
1795
1796                 # Does the article have a history?
1797                 $row = $dbw->selectRow( array( 'page', 'revision'),
1798                         array( 'rev_id' ),
1799                         array( 'page_namespace' => $nt->getNamespace(),
1800                                 'page_title' => $nt->getDBkey(),
1801                                 'page_id=rev_page AND page_latest != rev_id'
1802                         ), $fname, 'FOR UPDATE'
1803                 );
1804
1805                 # Return true if there was no history
1806                 return $row === false;
1807         }
1808
1809         /**
1810          * Create a redirect; fails if the title already exists; does
1811          * not notify RC
1812          *
1813          * @param Title $dest the destination of the redirect
1814          * @param string $comment the comment string describing the move
1815          * @return bool true on success
1816          * @access public
1817          */
1818         function createRedirect( $dest, $comment ) {
1819                 global $wgUser;
1820                 if ( $this->getArticleID() ) {
1821                         return false;
1822                 }
1823
1824                 $fname = 'Title::createRedirect';
1825                 $dbw =& wfGetDB( DB_MASTER );
1826
1827                 $article = new Article( $this );
1828                 $newid = $article->insertOn( $dbw );
1829                 $revision = new Revision( array(
1830                         'page'      => $newid,
1831                         'comment'   => $comment,
1832                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1833                         ) );
1834                 $revisionId = $revision->insertOn( $dbw );
1835                 $article->updateRevisionOn( $dbw, $revision, 0 );
1836
1837                 # Link table
1838                 if ( $dest->getArticleID() ) {
1839                         $dbw->insert( 'links',
1840                                 array(
1841                                         'l_to' => $dest->getArticleID(),
1842                                         'l_from' => $newid
1843                                 ), $fname
1844                         );
1845                 } else {
1846                         $dbw->insert( 'brokenlinks',
1847                                 array(
1848                                         'bl_to' => $dest->getPrefixedDBkey(),
1849                                         'bl_from' => $newid
1850                                 ), $fname
1851                         );
1852                 }
1853
1854                 Article::onArticleCreate( $this );
1855                 return true;
1856         }
1857
1858         /**
1859          * Get categories to which this Title belongs and return an array of
1860          * categories' names.
1861          *
1862          * @return array an array of parents in the form:
1863          *      $parent => $currentarticle
1864          * @access public
1865          */
1866         function getParentCategories() {
1867                 global $wgContLang,$wgUser;
1868
1869                 $titlekey = $this->getArticleId();
1870                 $sk =& $wgUser->getSkin();
1871                 $parents = array();
1872                 $dbr =& wfGetDB( DB_SLAVE );
1873                 $categorylinks = $dbr->tableName( 'categorylinks' );
1874
1875                 # NEW SQL
1876                 $sql = "SELECT * FROM $categorylinks"
1877                      ." WHERE cl_from='$titlekey'"
1878                          ." AND cl_from <> '0'"
1879                          ." ORDER BY cl_sortkey";
1880
1881                 $res = $dbr->query ( $sql ) ;
1882
1883                 if($dbr->numRows($res) > 0) {
1884                         while ( $x = $dbr->fetchObject ( $res ) )
1885                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1886                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1887                         $dbr->freeResult ( $res ) ;
1888                 } else {
1889                         $data = '';
1890                 }
1891                 return $data;
1892         }
1893
1894         /**
1895          * Get a tree of parent categories
1896          * @param array $children an array with the children in the keys, to check for circular refs
1897          * @return array
1898          * @access public
1899          */
1900         function getParentCategoryTree( $children = array() ) {
1901                 $parents = $this->getParentCategories();
1902
1903                 if($parents != '') {
1904                         foreach($parents as $parent => $current)
1905                         {
1906                                 if ( array_key_exists( $parent, $children ) ) {
1907                                         # Circular reference
1908                                         $stack[$parent] = array();
1909                                 } else {
1910                                         $nt = Title::newFromText($parent);
1911                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1912                                 }
1913                         }
1914                         return $stack;
1915                 } else {
1916                         return array();
1917                 }
1918         }
1919
1920
1921         /**
1922          * Get an associative array for selecting this title from
1923          * the "cur" table
1924          *
1925          * @return array
1926          * @access public
1927          */
1928         function curCond() {
1929                 wfDebugDieBacktrace( 'curCond called' );
1930                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1931         }
1932
1933         /**
1934          * Get an associative array for selecting this title from the
1935          * "old" table
1936          *
1937          * @return array
1938          * @access public
1939          */
1940         function oldCond() {
1941                 wfDebugDieBacktrace( 'oldCond called' );
1942                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1943         }
1944
1945         /**
1946          * Get the revision ID of the previous revision
1947          *
1948          * @param integer $revision  Revision ID. Get the revision that was before this one.
1949          * @return interger $oldrevision|false
1950          */
1951         function getPreviousRevisionID( $revision ) {
1952                 $dbr =& wfGetDB( DB_SLAVE );
1953                 return $dbr->selectField( 'revision', 'rev_id',
1954                         'rev_page=' . IntVal( $this->getArticleId() ) .
1955                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1956         }
1957
1958         /**
1959          * Get the revision ID of the next revision
1960          *
1961          * @param integer $revision  Revision ID. Get the revision that was after this one.
1962          * @return interger $oldrevision|false
1963          */
1964         function getNextRevisionID( $revision ) {
1965                 $dbr =& wfGetDB( DB_SLAVE );
1966                 return $dbr->selectField( 'revision', 'rev_id',
1967                         'rev_page=' . IntVal( $this->getArticleId() ) .
1968                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1969         }
1970
1971         /**
1972          * Compare with another title.
1973          *
1974          * @param Title $title
1975          * @return bool
1976          */
1977         function equals( &$title ) {
1978                 return $this->getInterwiki() == $title->getInterwiki()
1979                         && $this->getNamespace() == $title->getNamespace()
1980                         && $this->getDbkey() == $title->getDbkey();
1981         }
1982
1983         /**
1984          * Check if page exists
1985          * @return bool
1986          */
1987         function exists() {
1988                 return $this->getArticleId() != 0;
1989         }
1990
1991         /**
1992          * Should a link should be displayed as a known link, just based on its title?
1993          *
1994          * Currently, a self-link with a fragment, special pages and image pages are in
1995          * this category. Special pages never exist in the database. Some images do not
1996          * have description pages in the database, but the description page contains
1997          * useful history information that the user may want to link to.
1998          *
1999          */
2000         function isAlwaysKnown() {
2001                 return ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2002                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2003         }
2004 }
2005 ?>