includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 require_once( 'normal/UtfNormal.php' );
   9
  10 $wgTitleInterwikiCache = array();
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 # Title::newFromTitle maintains a cache to avoid
  14 # expensive re-normalization of commonly used titles.
  15 # On a batch operation this can become a memory leak
  16 # if not bounded. After hitting this many titles,
  17 # reset the cache.
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 /**
  21  * Title class
  22  * - Represents a title, which may contain an interwiki designation or namespace
  23  * - Can fetch various kinds of data from the database, albeit inefficiently.
  24  *
  25  * @package MediaWiki
  26  */
  27 class Title {
  28         /**
  29          * All member variables should be considered private
  30          * Please use the accessor functions
  31          */
  32
  33          /**#@+
  34          * @access private
  35          */
  36
  37         var $mTextform;           # Text form (spaces not underscores) of the main part
  38         var $mUrlform;            # URL-encoded form of the main part
  39         var $mDbkeyform;          # Main part with underscores
  40         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  41         var $mInterwiki;          # Interwiki prefix (or null string)
  42         var $mFragment;           # Title fragment (i.e. the bit after the #)
  43         var $mArticleID;          # Article ID, fetched from the link cache on demand
  44         var $mRestrictions;       # Array of groups allowed to edit this article
  45                               # Only null or "sysop" are supported
  46         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  47         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  48         var $mDefaultNamespace;   # Namespace index when there is no namespace
  49                               # Zero except in {{transclusion}} tags
  50         /**#@-*/
  51
  52
  53         /**
  54          * Constructor
  55          * @access private
  56          */
  57         /* private */ function Title() {
  58                 $this->mInterwiki = $this->mUrlform =
  59                 $this->mTextform = $this->mDbkeyform = '';
  60                 $this->mArticleID = -1;
  61                 $this->mNamespace = NS_MAIN;
  62                 $this->mRestrictionsLoaded = false;
  63                 $this->mRestrictions = array();
  64                 # Dont change the following, NS_MAIN is hardcoded in several place
  65                 # See bug #696
  66                 $this->mDefaultNamespace = NS_MAIN;
  67         }
  68
  69         /**
  70          * Create a new Title from a prefixed DB key
  71          * @param string $key The database key, which has underscores
  72          *      instead of spaces, possibly including namespace and
  73          *      interwiki prefixes
  74          * @return Title the new object, or NULL on an error
  75          * @static
  76          * @access public
  77          */
  78         /* static */ function newFromDBkey( $key ) {
  79                 $t = new Title();
  80                 $t->mDbkeyform = $key;
  81                 if( $t->secureAndSplit() )
  82                         return $t;
  83                 else
  84                         return NULL;
  85         }
  86
  87         /**
  88          * Create a new Title from text, such as what one would
  89          * find in a link. Decodes any HTML entities in the text.
  90          *
  91          * @param string $text the link text; spaces, prefixes,
  92          *      and an initial ':' indicating the main namespace
  93          *      are accepted
  94          * @param int $defaultNamespace the namespace to use if
  95          *      none is specified by a prefix
  96          * @return Title the new object, or NULL on an error
  97          * @static
  98          * @access public
  99          */
 100         function &newFromText( $text, $defaultNamespace = NS_MAIN ) {
 101                 $fname = 'Title::newFromText';
 102                 wfProfileIn( $fname );
 103
 104                 if( is_object( $text ) ) {
 105                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 106                 }
 107
 108                 /**
 109                  * Wiki pages often contain multiple links to the same page.
 110                  * Title normalization and parsing can become expensive on
 111                  * pages with many links, so we can save a little time by
 112                  * caching them.
 113                  *
 114                  * In theory these are value objects and won't get changed...
 115                  */
 116                 static $titleCache = array();
 117                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 118                         wfProfileOut( $fname );
 119                         return $titleCache[$text];
 120                 }
 121
 122                 /**
 123                  * Convert things like &eacute; into real text...
 124                  */
 125                 global $wgInputEncoding;
 126                 $filteredText = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 127
 128                 /**
 129                  * Convert things like &#257; or &#x3017; into real text...
 130                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 131                  */
 132                 $filteredText = wfMungeToUtf8( $filteredText );
 133
 134                 # What was this for? TS 2004-03-03
 135                 # $text = urldecode( $text );
 136
 137                 $t =& new Title();
 138                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 139                 $t->mDefaultNamespace = $defaultNamespace;
 140
 141                 if( $t->secureAndSplit() ) {
 142                         if( $defaultNamespace == NS_MAIN ) {
 143                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 144                                         # Avoid memory leaks on mass operations...
 145                                         $titleCache = array();
 146                                 }
 147                                 $titleCache[$text] =& $t;
 148                         }
 149                         wfProfileOut( $fname );
 150                         return $t;
 151                 } else {
 152                         wfProfileOut( $fname );
 153                         return NULL;
 154                 }
 155         }
 156
 157         /**
 158          * Create a new Title from URL-encoded text. Ensures that
 159          * the given title's length does not exceed the maximum.
 160          * @param string $url the title, as might be taken from a URL
 161          * @return Title the new object, or NULL on an error
 162          * @static
 163          * @access public
 164          */
 165         function newFromURL( $url ) {
 166                 global $wgLang, $wgServer;
 167                 $t = new Title();
 168
 169                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 170                 # but some URLs used it as a space replacement and they still come
 171                 # from some external search tools.
 172                 $s = str_replace( '+', ' ', $url );
 173
 174                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 175                 if( $t->secureAndSplit() ) {
 176                         return $t;
 177                 } else {
 178                         return NULL;
 179                 }
 180         }
 181
 182         /**
 183          * Create a new Title from an article ID
 184          *
 185          * @todo This is inefficiently implemented, the page row is requested
 186          *       but not used for anything else
 187          *
 188          * @param int $id the page_id corresponding to the Title to create
 189          * @return Title the new object, or NULL on an error
 190          * @access public
 191          * @static
 192          */
 193         function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr =& wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Create a new Title from a namespace index and a DB key.
 208          * It's assumed that $ns and $title are *valid*, for instance when
 209          * they came directly from the database or a special page name.
 210          * For convenience, spaces are converted to underscores so that
 211          * eg user_text fields can be used directly.
 212          *
 213          * @param int $ns the namespace of the article
 214          * @param string $title the unprefixed database key form
 215          * @return Title the new object
 216          * @static
 217          * @access public
 218          */
 219         function &makeTitle( $ns, $title ) {
 220                 $t =& new Title();
 221                 $t->mInterwiki = '';
 222                 $t->mFragment = '';
 223                 $t->mNamespace = IntVal( $ns );
 224                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 225                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 226                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 227                 $t->mTextform = str_replace( '_', ' ', $title );
 228                 return $t;
 229         }
 230
 231         /**
 232          * Create a new Title frrom a namespace index and a DB key.
 233          * The parameters will be checked for validity, which is a bit slower
 234          * than makeTitle() but safer for user-provided data.
 235          *
 236          * @param int $ns the namespace of the article
 237          * @param string $title the database key form
 238          * @return Title the new object, or NULL on an error
 239          * @static
 240          * @access public
 241          */
 242         function makeTitleSafe( $ns, $title ) {
 243                 $t = new Title();
 244                 $t->mDbkeyform = Title::makeName( $ns, $title );
 245                 if( $t->secureAndSplit() ) {
 246                         return $t;
 247                 } else {
 248                         return NULL;
 249                 }
 250         }
 251
 252         /**
 253          * Create a new Title for the Main Page
 254          *
 255          * @static
 256          * @return Title the new object
 257          * @access public
 258          */
 259         function newMainPage() {
 260                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 261         }
 262
 263         /**
 264          * Create a new Title for a redirect
 265          * @param string $text the redirect title text
 266          * @return Title the new object, or NULL if the text is not a
 267          *      valid redirect
 268          * @static
 269          * @access public
 270          */
 271         function newFromRedirect( $text ) {
 272                 global $wgMwRedir;
 273                 $rt = NULL;
 274                 if ( $wgMwRedir->matchStart( $text ) ) {
 275                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 276                                 # categories are escaped using : for example one can enter:
 277                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 278                                 if ( substr($m[1],0,1) == ':') {
 279                                         # We don't want to keep the ':'
 280                                         $m[1] = substr( $m[1], 1 );
 281                                 }
 282
 283                                 $rt = Title::newFromText( $m[1] );
 284                                 # Disallow redirects to Special:Userlogout
 285                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 286                                         $rt = NULL;
 287                                 }
 288                         }
 289                 }
 290                 return $rt;
 291         }
 292
 293 #----------------------------------------------------------------------------
 294 #       Static functions
 295 #----------------------------------------------------------------------------
 296
 297         /**
 298          * Get the prefixed DB key associated with an ID
 299          * @param int $id the page_id of the article
 300          * @return Title an object representing the article, or NULL
 301          *      if no such article was found
 302          * @static
 303          * @access public
 304          */
 305         function nameOf( $id ) {
 306                 $fname = 'Title::nameOf';
 307                 $dbr =& wfGetDB( DB_SLAVE );
 308
 309                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 310                 if ( $s === false ) { return NULL; }
 311
 312                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 313                 return $n;
 314         }
 315
 316         /**
 317          * Get a regex character class describing the legal characters in a link
 318          * @return string the list of characters, not delimited
 319          * @static
 320          * @access public
 321          */
 322         /* static */ function legalChars() {
 323                 # Missing characters:
 324                 #  * []|# Needed for link syntax
 325                 #  * % and + are corrupted by Apache when they appear in the path
 326                 #
 327                 # % seems to work though
 328                 #
 329                 # The problem with % is that URLs are double-unescaped: once by Apache's
 330                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 331                 # Our code does not double-escape to compensate for this, indeed double escaping
 332                 # would break if the double-escaped title was passed in the query string
 333                 # rather than the path. This is a minor security issue because articles can be
 334                 # created such that they are hard to view or edit. -- TS
 335                 #
 336                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 337                 # this breaks interlanguage links
 338
 339                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 340                 return $set;
 341         }
 342
 343         /**
 344          * Get a string representation of a title suitable for
 345          * including in a search index
 346          *
 347          * @param int $ns a namespace index
 348          * @param string $title text-form main part
 349          * @return string a stripped-down title string ready for the
 350          *      search index
 351          */
 352         /* static */ function indexTitle( $ns, $title ) {
 353                 global $wgDBminWordLen, $wgContLang;
 354                 require_once( 'SearchEngine.php' );
 355
 356                 $lc = SearchEngine::legalSearchChars() . '&#;';
 357                 $t = $wgContLang->stripForSearch( $title );
 358                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 359                 $t = strtolower( $t );
 360
 361                 # Handle 's, s'
 362                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 363                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 364
 365                 $t = preg_replace( "/\\s+/", ' ', $t );
 366
 367                 if ( $ns == NS_IMAGE ) {
 368                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 369                 }
 370                 return trim( $t );
 371         }
 372
 373         /*
 374          * Make a prefixed DB key from a DB key and a namespace index
 375          * @param int $ns numerical representation of the namespace
 376          * @param string $title the DB key form the title
 377          * @return string the prefixed form of the title
 378          */
 379         /* static */ function makeName( $ns, $title ) {
 380                 global $wgContLang;
 381
 382                 $n = $wgContLang->getNsText( $ns );
 383                 return $n == '' ? $title : "$n:$title";
 384         }
 385
 386         /**
 387          * Returns the URL associated with an interwiki prefix
 388          * @param string $key the interwiki prefix (e.g. "MeatBall")
 389          * @return the associated URL, containing "$1", which should be
 390          *      replaced by an article title
 391          * @static (arguably)
 392          * @access public
 393          */
 394         function getInterwikiLink( $key ) {
 395                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 396                 $fname = 'Title::getInterwikiLink';
 397
 398                 wfProfileIn( $fname );
 399
 400                 $k = $wgDBname.':interwiki:'.$key;
 401                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 402                         wfProfileOut( $fname );
 403                         return $wgTitleInterwikiCache[$k]->iw_url;
 404                 }
 405
 406                 $s = $wgMemc->get( $k );
 407                 # Ignore old keys with no iw_local
 408                 if( $s && isset( $s->iw_local ) ) {
 409                         $wgTitleInterwikiCache[$k] = $s;
 410                         wfProfileOut( $fname );
 411                         return $s->iw_url;
 412                 }
 413
 414                 $dbr =& wfGetDB( DB_SLAVE );
 415                 $res = $dbr->select( 'interwiki',
 416                         array( 'iw_url', 'iw_local' ),
 417                         array( 'iw_prefix' => $key ), $fname );
 418                 if( !$res ) {
 419                         wfProfileOut( $fname );
 420                         return '';
 421                 }
 422
 423                 $s = $dbr->fetchObject( $res );
 424                 if( !$s ) {
 425                         # Cache non-existence: create a blank object and save it to memcached
 426                         $s = (object)false;
 427                         $s->iw_url = '';
 428                         $s->iw_local = 0;
 429                 }
 430                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 431                 $wgTitleInterwikiCache[$k] = $s;
 432
 433                 wfProfileOut( $fname );
 434                 return $s->iw_url;
 435         }
 436
 437         /**
 438          * Determine whether the object refers to a page within
 439          * this project.
 440          *
 441          * @return bool TRUE if this is an in-project interwiki link
 442          *      or a wikilink, FALSE otherwise
 443          * @access public
 444          */
 445         function isLocal() {
 446                 global $wgTitleInterwikiCache, $wgDBname;
 447
 448                 if ( $this->mInterwiki != '' ) {
 449                         # Make sure key is loaded into cache
 450                         $this->getInterwikiLink( $this->mInterwiki );
 451                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 452                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 453                 } else {
 454                         return true;
 455                 }
 456         }
 457
 458         /**
 459          * Update the page_touched field for an array of title objects
 460          * @todo Inefficient unless the IDs are already loaded into the
 461          *      link cache
 462          * @param array $titles an array of Title objects to be touched
 463          * @param string $timestamp the timestamp to use instead of the
 464          *      default current time
 465          * @static
 466          * @access public
 467          */
 468         function touchArray( $titles, $timestamp = '' ) {
 469                 if ( count( $titles ) == 0 ) {
 470                         return;
 471                 }
 472                 $dbw =& wfGetDB( DB_MASTER );
 473                 if ( $timestamp == '' ) {
 474                         $timestamp = $dbw->timestamp();
 475                 }
 476                 $page = $dbw->tableName( 'page' );
 477                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 478                 $first = true;
 479
 480                 foreach ( $titles as $title ) {
 481                         if ( ! $first ) {
 482                                 $sql .= ',';
 483                         }
 484                         $first = false;
 485                         $sql .= $title->getArticleID();
 486                 }
 487                 $sql .= ')';
 488                 if ( ! $first ) {
 489                         $dbw->query( $sql, 'Title::touchArray' );
 490                 }
 491         }
 492
 493 #----------------------------------------------------------------------------
 494 #       Other stuff
 495 #----------------------------------------------------------------------------
 496
 497         /** Simple accessors */
 498         /**
 499          * Get the text form (spaces not underscores) of the main part
 500          * @return string
 501          * @access public
 502          */
 503         function getText() { return $this->mTextform; }
 504         /**
 505          * Get the URL-encoded form of the main part
 506          * @return string
 507          * @access public
 508          */
 509         function getPartialURL() { return $this->mUrlform; }
 510         /**
 511          * Get the main part with underscores
 512          * @return string
 513          * @access public
 514          */
 515         function getDBkey() { return $this->mDbkeyform; }
 516         /**
 517          * Get the namespace index, i.e. one of the NS_xxxx constants
 518          * @return int
 519          * @access public
 520          */
 521         function getNamespace() { return $this->mNamespace; }
 522         /**
 523          * Get the interwiki prefix (or null string)
 524          * @return string
 525          * @access public
 526          */
 527         function getInterwiki() { return $this->mInterwiki; }
 528         /**
 529          * Get the Title fragment (i.e. the bit after the #)
 530          * @return string
 531          * @access public
 532          */
 533         function getFragment() { return $this->mFragment; }
 534         /**
 535          * Get the default namespace index, for when there is no namespace
 536          * @return int
 537          * @access public
 538          */
 539         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 540
 541         /**
 542          * Get title for search index
 543          * @return string a stripped-down title string ready for the
 544          *      search index
 545          */
 546         function getIndexTitle() {
 547                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 548         }
 549
 550         /**
 551          * Get the prefixed database key form
 552          * @return string the prefixed title, with underscores and
 553          *      any interwiki and namespace prefixes
 554          * @access public
 555          */
 556         function getPrefixedDBkey() {
 557                 $s = $this->prefix( $this->mDbkeyform );
 558                 $s = str_replace( ' ', '_', $s );
 559                 return $s;
 560         }
 561
 562         /**
 563          * Get the prefixed title with spaces.
 564          * This is the form usually used for display
 565          * @return string the prefixed title, with spaces
 566          * @access public
 567          */
 568         function getPrefixedText() {
 569                 global $wgContLang;
 570                 if ( empty( $this->mPrefixedText ) ) {
 571                         $s = $this->prefix( $this->mTextform );
 572                         $s = str_replace( '_', ' ', $s );
 573                         $this->mPrefixedText = $s;
 574                 }
 575                 return $this->mPrefixedText;
 576         }
 577
 578         /**
 579          * Get the prefixed title with spaces, plus any fragment
 580          * (part beginning with '#')
 581          * @return string the prefixed title, with spaces and
 582          *      the fragment, including '#'
 583          * @access public
 584          */
 585         function getFullText() {
 586                 global $wgContLang;
 587                 $text = $this->getPrefixedText();
 588                 if( '' != $this->mFragment ) {
 589                         $text .= '#' . $this->mFragment;
 590                 }
 591                 return $text;
 592         }
 593
 594         /**
 595          * Get a URL-encoded title (not an actual URL) including interwiki
 596          * @return string the URL-encoded form
 597          * @access public
 598          */
 599         function getPrefixedURL() {
 600                 $s = $this->prefix( $this->mDbkeyform );
 601                 $s = str_replace( ' ', '_', $s );
 602
 603                 $s = wfUrlencode ( $s ) ;
 604
 605                 # Cleaning up URL to make it look nice -- is this safe?
 606                 $s = str_replace( '%28', '(', $s );
 607                 $s = str_replace( '%29', ')', $s );
 608
 609                 return $s;
 610         }
 611
 612         /**
 613          * Get a real URL referring to this title, with interwiki link and
 614          * fragment
 615          *
 616          * @param string $query an optional query string, not used
 617          *      for interwiki links
 618          * @return string the URL
 619          * @access public
 620          */
 621         function getFullURL( $query = '' ) {
 622                 global $wgContLang, $wgServer, $wgScript;
 623
 624                 if ( '' == $this->mInterwiki ) {
 625                         return $wgServer . $this->getLocalUrl( $query );
 626                 } else {
 627                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 628                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 629                         if ( '' != $namespace ) {
 630                                 # Can this actually happen? Interwikis shouldn't be parsed.
 631                                 $namepace .= ':';
 632                         }
 633                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 634                         if( $query != '' ) {
 635                                 if( false === strpos( $url, '?' ) ) {
 636                                         $url .= '?';
 637                                 } else {
 638                                         $url .= '&';
 639                                 }
 640                                 $url .= $query;
 641                         }
 642                         if ( '' != $this->mFragment ) {
 643                                 $url .= '#' . $this->mFragment;
 644                         }
 645                         return $url;
 646                 }
 647         }
 648
 649         /**
 650          * Get a relative directory for putting an HTML version of this article into
 651          */
 652         function getHashedDirectory() {
 653                 $dbkey = $this->getPrefixedDBkey();
 654                 if ( strlen( $dbkey ) < 2 ) {
 655                         $dbkey = sprintf( "%2s", $dbkey );
 656                 }
 657                 $dir = '';
 658                 for ( $i=0; $i<=1; $i++ ) {
 659                         if ( $i ) {
 660                                 $dir .= '/';
 661                         }
 662                         if ( ord( $dbkey{$i} ) < 128 && ord( $dbkey{$i} ) > 32 ) {
 663                                 $dir .= strtolower( $dbkey{$i} );
 664                         } else {
 665                                 $dir .= sprintf( "%02X", ord( $dbkey{$i} ) );
 666                         }
 667                 }
 668                 return $dir;
 669         }
 670
 671         function getHashedFilename() {
 672                 $dbkey = $this->getPrefixedDBkey();
 673                 $dir = $this->getHashedDirectory();
 674                 $friendlyName = strtr( $dbkey, '/\\:*?"<>|', '_________' );
 675                 return "$dir/$friendlyName.html";
 676         }
 677
 678         /**
 679          * Get a URL with no fragment or server name
 680          * @param string $query an optional query string; if not specified,
 681          *      $wgArticlePath will be used.
 682          * @return string the URL
 683          * @access public
 684          */
 685         function getLocalURL( $query = '' ) {
 686                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks;
 687
 688                 if ( $this->isExternal() ) {
 689                         return $this->getFullURL();
 690                 }
 691
 692                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 693                 if ( $wgMakeDumpLinks ) {
 694                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 695                 } elseif ( $query == '' ) {
 696                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 697                 } else {
 698                         if( preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 699                                 global $wgActionPaths;
 700                                 $action = urldecode( $matches[2] );
 701                                 if( isset( $wgActionPaths[$action] ) ) {
 702                                         $query = $matches[1];
 703                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 704                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 705                                         if( $query != '' ) $url .= '?' . $query;
 706                                         return $url;
 707                                 }
 708                         }
 709                         if ( $query == '-' ) {
 710                                 $query = '';
 711                         }
 712                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 713                 }
 714                 return $url;
 715         }
 716
 717         /**
 718          * Get an HTML-escaped version of the URL form, suitable for
 719          * using in a link, without a server name or fragment
 720          * @param string $query an optional query string
 721          * @return string the URL
 722          * @access public
 723          */
 724         function escapeLocalURL( $query = '' ) {
 725                 return htmlspecialchars( $this->getLocalURL( $query ) );
 726         }
 727
 728         /**
 729          * Get an HTML-escaped version of the URL form, suitable for
 730          * using in a link, including the server name and fragment
 731          *
 732          * @return string the URL
 733          * @param string $query an optional query string
 734          * @access public
 735          */
 736         function escapeFullURL( $query = '' ) {
 737                 return htmlspecialchars( $this->getFullURL( $query ) );
 738         }
 739
 740         /**
 741          * Get the URL form for an internal link.
 742          * - Used in various Squid-related code, in case we have a different
 743          * internal hostname for the server from the exposed one.
 744          *
 745          * @param string $query an optional query string
 746          * @return string the URL
 747          * @access public
 748          */
 749         function getInternalURL( $query = '' ) {
 750                 global $wgInternalServer;
 751                 return $wgInternalServer . $this->getLocalURL( $query );
 752         }
 753
 754         /**
 755          * Get the edit URL for this Title
 756          * @return string the URL, or a null string if this is an
 757          *      interwiki link
 758          * @access public
 759          */
 760         function getEditURL() {
 761                 global $wgServer, $wgScript;
 762
 763                 if ( '' != $this->mInterwiki ) { return ''; }
 764                 $s = $this->getLocalURL( 'action=edit' );
 765
 766                 return $s;
 767         }
 768
 769         /**
 770          * Get the HTML-escaped displayable text form.
 771          * Used for the title field in <a> tags.
 772          * @return string the text, including any prefixes
 773          * @access public
 774          */
 775         function getEscapedText() {
 776                 return htmlspecialchars( $this->getPrefixedText() );
 777         }
 778
 779         /**
 780          * Is this Title interwiki?
 781          * @return boolean
 782          * @access public
 783          */
 784         function isExternal() { return ( '' != $this->mInterwiki ); }
 785
 786         /**
 787          * Does the title correspond to a protected article?
 788          * @param string $what the action the page is protected from,
 789          *      by default checks move and edit
 790          * @return boolean
 791          * @access public
 792          */
 793         function isProtected($action = '') {
 794                 if ( -1 == $this->mNamespace ) { return true; }
 795                 if($action == 'edit' || $action == '') {
 796                         $a = $this->getRestrictions("edit");
 797                         if ( in_array( 'sysop', $a ) ) { return true; }
 798                 }
 799                 if($action == 'move' || $action == '') {
 800                         $a = $this->getRestrictions("move");
 801                         if ( in_array( 'sysop', $a ) ) { return true; }
 802                 }
 803                 return false;
 804         }
 805
 806         /**
 807          * Is $wgUser is watching this page?
 808          * @return boolean
 809          * @access public
 810          */
 811         function userIsWatching() {
 812                 global $wgUser;
 813
 814                 if ( -1 == $this->mNamespace ) { return false; }
 815                 if ( 0 == $wgUser->getID() ) { return false; }
 816
 817                 return $wgUser->isWatched( $this );
 818         }
 819
 820         /**
 821          * Is $wgUser perform $action this page?
 822          * @param string $action action that permission needs to be checked for
 823          * @return boolean
 824          * @access private
 825          */
 826         function userCan($action) {
 827                 $fname = 'Title::userCanEdit';
 828                 wfProfileIn( $fname );
 829
 830                 global $wgUser;
 831                 if( NS_SPECIAL == $this->mNamespace ) {
 832                         wfProfileOut( $fname );
 833                         return false;
 834                 }
 835                 if( NS_MEDIAWIKI == $this->mNamespace &&
 836                     !$wgUser->isAllowed('editinterface') ) {
 837                         wfProfileOut( $fname );
 838                         return false;
 839                 }
 840                 if( $this->mDbkeyform == '_' ) {
 841                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 842                         wfProfileOut( $fname );
 843                         return false;
 844                 }
 845
 846                 # protect global styles and js
 847                 if ( NS_MEDIAWIKI == $this->mNamespace
 848                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 849                      && !$wgUser->isAllowed('editinterface') ) {
 850                         wfProfileOut( $fname );
 851                         return false;
 852                 }
 853
 854                 # protect css/js subpages of user pages
 855                 # XXX: this might be better using restrictions
 856                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 857                 if( NS_USER == $this->mNamespace
 858                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 859                         && !$wgUser->isAllowed('editinterface')
 860                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 861                         wfProfileOut( $fname );
 862                         return false;
 863                 }
 864
 865                 foreach( $this->getRestrictions($action) as $right ) {
 866                         // Backwards compatibility, rewrite sysop -> protect
 867                         if ( $right == 'sysop' ) {
 868                                 $right = 'protect';
 869                         }
 870                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 871                                 wfProfileOut( $fname );
 872                                 return false;
 873                         }
 874                 }
 875
 876                 if( $action == 'move' && !$this->isMovable() ) {
 877                         wfProfileOut( $fname );
 878                         return false;
 879                 }
 880
 881                 wfProfileOut( $fname );
 882                 return true;
 883         }
 884
 885         /**
 886          * Can $wgUser edit this page?
 887          * @return boolean
 888          * @access public
 889          */
 890         function userCanEdit() {
 891                 return $this->userCan('edit');
 892         }
 893
 894         /**
 895          * Can $wgUser move this page?
 896          * @return boolean
 897          * @access public
 898          */
 899         function userCanMove() {
 900                 return $this->userCan('move');
 901         }
 902
 903         /**
 904          * Would anybody with sufficient privileges be able to move this page?
 905          * Some pages just aren't movable.
 906          *
 907          * @return boolean
 908          * @access public
 909          */
 910         function isMovable() {
 911                 return Namespace::isMovable( $this->getNamespace() )
 912                         && $this->getInterwiki() == '';
 913         }
 914
 915         /**
 916          * Can $wgUser read this page?
 917          * @return boolean
 918          * @access public
 919          */
 920         function userCanRead() {
 921                 global $wgUser;
 922
 923                 if( $wgUser->isAllowed('read') ) {
 924                         return true;
 925                 } else {
 926                         global $wgWhitelistRead;
 927
 928                         /** If anon users can create an account,
 929                             they need to reach the login page first! */
 930                         if( $wgUser->isAllowed( 'createaccount' )
 931                             && $this->mId == NS_SPECIAL
 932                             && $this->getText() == 'Userlogin' ) {
 933                                 return true;
 934                         }
 935
 936                         /** some pages are explicitly allowed */
 937                         $name = $this->getPrefixedText();
 938                         if( in_array( $name, $wgWhitelistRead ) ) {
 939                                 return true;
 940                         }
 941
 942                         # Compatibility with old settings
 943                         if( $this->getNamespace() == NS_MAIN ) {
 944                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 945                                         return true;
 946                                 }
 947                         }
 948                 }
 949                 return false;
 950         }
 951
 952         /**
 953          * Is this a talk page of some sort?
 954          * @return bool
 955          * @access public
 956          */
 957         function isTalkPage() {
 958                 return Namespace::isTalk( $this->getNamespace() );
 959         }
 960
 961         /**
 962          * Is this a .css or .js subpage of a user page?
 963          * @return bool
 964          * @access public
 965          */
 966         function isCssJsSubpage() {
 967                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 968         }
 969         /**
 970          * Is this a .css subpage of a user page?
 971          * @return bool
 972          * @access public
 973          */
 974         function isCssSubpage() {
 975                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 976         }
 977         /**
 978          * Is this a .js subpage of a user page?
 979          * @return bool
 980          * @access public
 981          */
 982         function isJsSubpage() {
 983                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 984         }
 985         /**
 986          * Protect css/js subpages of user pages: can $wgUser edit
 987          * this page?
 988          *
 989          * @return boolean
 990          * @todo XXX: this might be better using restrictions
 991          * @access public
 992          */
 993         function userCanEditCssJsSubpage() {
 994                 global $wgUser;
 995                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 996         }
 997
 998         /**
 999          * Loads a string into mRestrictions array
1000          * @param string $res restrictions in string format
1001          * @access public
1002          */
1003         function loadRestrictions( $res ) {
1004                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1005                         $temp = explode( '=', trim( $restrict ) );
1006                         if(count($temp) == 1) {
1007                                 // old format should be treated as edit/move restriction
1008                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1009                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1010                         } else {
1011                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1012                         }
1013                 }
1014                 $this->mRestrictionsLoaded = true;
1015         }
1016
1017         /**
1018          * Accessor/initialisation for mRestrictions
1019          * @param string $action action that permission needs to be checked for
1020          * @return array the array of groups allowed to edit this article
1021          * @access public
1022          */
1023         function getRestrictions($action) {
1024                 $id = $this->getArticleID();
1025                 if ( 0 == $id ) { return array(); }
1026
1027                 if ( ! $this->mRestrictionsLoaded ) {
1028                         $dbr =& wfGetDB( DB_SLAVE );
1029                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1030                         $this->loadRestrictions( $res );
1031                 }
1032                 if( isset( $this->mRestrictions[$action] ) ) {
1033                         return $this->mRestrictions[$action];
1034                 }
1035                 return array();
1036         }
1037
1038         /**
1039          * Is there a version of this page in the deletion archive?
1040          * @return int the number of archived revisions
1041          * @access public
1042          */
1043         function isDeleted() {
1044                 $fname = 'Title::isDeleted';
1045                 $dbr =& wfGetDB( DB_SLAVE );
1046                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1047                         'ar_title' => $this->getDBkey() ), $fname );
1048                 return (int)$n;
1049         }
1050
1051         /**
1052          * Get the article ID for this Title from the link cache,
1053          * adding it if necessary
1054          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1055          *      for update
1056          * @return int the ID
1057          * @access public
1058          */
1059         function getArticleID( $flags = 0 ) {
1060                 global $wgLinkCache;
1061
1062                 if ( $flags & GAID_FOR_UPDATE ) {
1063                         $oldUpdate = $wgLinkCache->forUpdate( true );
1064                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1065                         $wgLinkCache->forUpdate( $oldUpdate );
1066                 } else {
1067                         if ( -1 == $this->mArticleID ) {
1068                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1069                         }
1070                 }
1071                 return $this->mArticleID;
1072         }
1073
1074         /**
1075          * This clears some fields in this object, and clears any associated
1076          * keys in the "bad links" section of $wgLinkCache.
1077          *
1078          * - This is called from Article::insertNewArticle() to allow
1079          * loading of the new page_id. It's also called from
1080          * Article::doDeleteArticle()
1081          *
1082          * @param int $newid the new Article ID
1083          * @access public
1084          */
1085         function resetArticleID( $newid ) {
1086                 global $wgLinkCache;
1087                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1088
1089                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1090                 else { $this->mArticleID = $newid; }
1091                 $this->mRestrictionsLoaded = false;
1092                 $this->mRestrictions = array();
1093         }
1094
1095         /**
1096          * Updates page_touched for this page; called from LinksUpdate.php
1097          * @return bool true if the update succeded
1098          * @access public
1099          */
1100         function invalidateCache() {
1101                 if ( wfReadOnly() ) {
1102                         return;
1103                 }
1104
1105                 $now = wfTimestampNow();
1106                 $dbw =& wfGetDB( DB_MASTER );
1107                 $success = $dbw->update( 'page',
1108                         array( /* SET */
1109                                 'page_touched' => $dbw->timestamp()
1110                         ), array( /* WHERE */
1111                                 'page_namespace' => $this->getNamespace() ,
1112                                 'page_title' => $this->getDBkey()
1113                         ), 'Title::invalidateCache'
1114                 );
1115                 return $success;
1116         }
1117
1118         /**
1119          * Prefix some arbitrary text with the namespace or interwiki prefix
1120          * of this object
1121          *
1122          * @param string $name the text
1123          * @return string the prefixed text
1124          * @access private
1125          */
1126         /* private */ function prefix( $name ) {
1127                 global $wgContLang;
1128
1129                 $p = '';
1130                 if ( '' != $this->mInterwiki ) {
1131                         $p = $this->mInterwiki . ':';
1132                 }
1133                 if ( 0 != $this->mNamespace ) {
1134                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1135                 }
1136                 return $p . $name;
1137         }
1138
1139         /**
1140          * Secure and split - main initialisation function for this object
1141          *
1142          * Assumes that mDbkeyform has been set, and is urldecoded
1143          * and uses underscores, but not otherwise munged.  This function
1144          * removes illegal characters, splits off the interwiki and
1145          * namespace prefixes, sets the other forms, and canonicalizes
1146          * everything.
1147          * @return bool true on success
1148          * @access private
1149          */
1150         /* private */ function secureAndSplit() {
1151                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1152                 $fname = 'Title::secureAndSplit';
1153                 wfProfileIn( $fname );
1154
1155                 # Initialisation
1156                 static $rxTc = false;
1157                 if( !$rxTc ) {
1158                         # % is needed as well
1159                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1160                 }
1161
1162                 $this->mInterwiki = $this->mFragment = '';
1163                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1164
1165                 # Clean up whitespace
1166                 #
1167                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1168                 $t = trim( $t, '_' );
1169
1170                 if ( '' == $t ) {
1171                         wfProfileOut( $fname );
1172                         return false;
1173                 }
1174
1175                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1176                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1177                         wfProfileOut( $fname );
1178                         return false;
1179                 }
1180
1181                 $this->mDbkeyform = $t;
1182
1183                 # Initial colon indicating main namespace
1184                 if ( ':' == $t{0} ) {
1185                         $r = substr( $t, 1 );
1186                         $this->mNamespace = NS_MAIN;
1187                 } else {
1188                         # Namespace or interwiki prefix
1189                         $firstPass = true;
1190                         do {
1191                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1192                                         $p = $m[1];
1193                                         $lowerNs = strtolower( $p );
1194                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1195                                                 # Canonical namespace
1196                                                 $t = $m[2];
1197                                                 $this->mNamespace = $ns;
1198                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1199                                                 # Ordinary namespace
1200                                                 $t = $m[2];
1201                                                 $this->mNamespace = $ns;
1202                                         } elseif( $this->getInterwikiLink( $p ) ) {
1203                                                 if( !$firstPass ) {
1204                                                         # Can't make a local interwiki link to an interwiki link.
1205                                                         # That's just crazy!
1206                                                         wfProfileOut( $fname );
1207                                                         return false;
1208                                                 }
1209
1210                                                 # Interwiki link
1211                                                 $t = $m[2];
1212                                                 $this->mInterwiki = $p;
1213
1214                                                 # Redundant interwiki prefix to the local wiki
1215                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1216                                                         if( $t == '' ) {
1217                                                                 # Can't have an empty self-link
1218                                                                 wfProfileOut( $fname );
1219                                                                 return false;
1220                                                         }
1221                                                         $this->mInterwiki = '';
1222                                                         $firstPass = false;
1223                                                         # Do another namespace split...
1224                                                         continue;
1225                                                 }
1226                                         }
1227                                         # If there's no recognized interwiki or namespace,
1228                                         # then let the colon expression be part of the title.
1229                                 }
1230                                 break;
1231                         } while( true );
1232                         $r = $t;
1233                 }
1234
1235                 # We already know that some pages won't be in the database!
1236                 #
1237                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1238                         $this->mArticleID = 0;
1239                 }
1240                 $f = strstr( $r, '#' );
1241                 if ( false !== $f ) {
1242                         $this->mFragment = substr( $f, 1 );
1243                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1244                         # remove whitespace again: prevents "Foo_bar_#"
1245                         # becoming "Foo_bar_"
1246                         $r = preg_replace( '/_*$/', '', $r );
1247                 }
1248
1249                 # Reject illegal characters.
1250                 #
1251                 if( preg_match( $rxTc, $r ) ) {
1252                         wfProfileOut( $fname );
1253                         return false;
1254                 }
1255
1256                 /**
1257                  * Pages with "/./" or "/../" appearing in the URLs will
1258                  * often be unreachable due to the way web browsers deal
1259                  * with 'relative' URLs. Forbid them explicitly.
1260                  */
1261                 if ( strpos( $r, '.' ) !== false &&
1262                      ( $r === '.' || $r === '..' ||
1263                        strpos( $r, './' ) === 0  ||
1264                        strpos( $r, '../' ) === 0 ||
1265                        strpos( $r, '/./' ) !== false ||
1266                        strpos( $r, '/../' ) !== false ) )
1267                 {
1268                         wfProfileOut( $fname );
1269                         return false;
1270                 }
1271
1272                 # We shouldn't need to query the DB for the size.
1273                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1274                 if ( strlen( $r ) > 255 ) {
1275                         wfProfileOut( $fname );
1276                         return false;
1277                 }
1278
1279                 /**
1280                  * Normally, all wiki links are forced to have
1281                  * an initial capital letter so [[foo]] and [[Foo]]
1282                  * point to the same place.
1283                  *
1284                  * Don't force it for interwikis, since the other
1285                  * site might be case-sensitive.
1286                  */
1287                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1288                         $t = $wgContLang->ucfirst( $r );
1289                 } else {
1290                         $t = $r;
1291                 }
1292
1293                 /**
1294                  * Can't make a link to a namespace alone...
1295                  * "empty" local links can only be self-links
1296                  * with a fragment identifier.
1297                  */
1298                 if( $t == '' &&
1299                         $this->mInterwiki == '' &&
1300                         $this->mNamespace != NS_MAIN ) {
1301                         wfProfileOut( $fname );
1302                         return false;
1303                 }
1304
1305                 # Fill fields
1306                 $this->mDbkeyform = $t;
1307                 $this->mUrlform = wfUrlencode( $t );
1308
1309                 $this->mTextform = str_replace( '_', ' ', $t );
1310
1311                 wfProfileOut( $fname );
1312                 return true;
1313         }
1314
1315         /**
1316          * Get a Title object associated with the talk page of this article
1317          * @return Title the object for the talk page
1318          * @access public
1319          */
1320         function getTalkPage() {
1321                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1322         }
1323
1324         /**
1325          * Get a title object associated with the subject page of this
1326          * talk page
1327          *
1328          * @return Title the object for the subject page
1329          * @access public
1330          */
1331         function getSubjectPage() {
1332                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1333         }
1334
1335         /**
1336          * Get an array of Title objects linking to this Title
1337          * Also stores the IDs in the link cache.
1338          *
1339          * @param string $options may be FOR UPDATE
1340          * @return array the Title objects linking here
1341          * @access public
1342          */
1343         function getLinksTo( $options = '' ) {
1344                 global $wgLinkCache;
1345                 $id = $this->getArticleID();
1346
1347                 if ( $options ) {
1348                         $db =& wfGetDB( DB_MASTER );
1349                 } else {
1350                         $db =& wfGetDB( DB_SLAVE );
1351                 }
1352                 $page = $db->tableName( 'page' );
1353                 $links = $db->tableName( 'links' );
1354
1355                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1356                 $res = $db->query( $sql, 'Title::getLinksTo' );
1357                 $retVal = array();
1358                 if ( $db->numRows( $res ) ) {
1359                         while ( $row = $db->fetchObject( $res ) ) {
1360                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1361                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1362                                         $retVal[] = $titleObj;
1363                                 }
1364                         }
1365                 }
1366                 $db->freeResult( $res );
1367                 return $retVal;
1368         }
1369
1370         /**
1371          * Get an array of Title objects linking to this non-existent title.
1372          * - Also stores the IDs in the link cache.
1373          *
1374          * @param string $options may be FOR UPDATE
1375          * @return array the Title objects linking here
1376          * @access public
1377          */
1378         function getBrokenLinksTo( $options = '' ) {
1379                 global $wgLinkCache;
1380
1381                 if ( $options ) {
1382                         $db =& wfGetDB( DB_MASTER );
1383                 } else {
1384                         $db =& wfGetDB( DB_SLAVE );
1385                 }
1386                 $page = $db->tableName( 'page' );
1387                 $brokenlinks = $db->tableName( 'brokenlinks' );
1388                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1389
1390                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1391                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1392                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1393                 $retVal = array();
1394                 if ( $db->numRows( $res ) ) {
1395                         while ( $row = $db->fetchObject( $res ) ) {
1396                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1397                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1398                                 $retVal[] = $titleObj;
1399                         }
1400                 }
1401                 $db->freeResult( $res );
1402                 return $retVal;
1403         }
1404
1405
1406         /**
1407          * Get an array of Title objects referring to non-existent articles linked from this page
1408          *
1409          * @param string $options may be FOR UPDATE
1410          * @return array the Title objects
1411          * @access public
1412          */
1413         function getBrokenLinksFrom( $options = '' ) {
1414                 global $wgLinkCache;
1415
1416                 if ( $options ) {
1417                         $db =& wfGetDB( DB_MASTER );
1418                 } else {
1419                         $db =& wfGetDB( DB_SLAVE );
1420                 }
1421                 $page = $db->tableName( 'page' );
1422                 $brokenlinks = $db->tableName( 'brokenlinks' );
1423                 $id = $this->getArticleID();
1424
1425                 $sql = "SELECT bl_to FROM $brokenlinks WHERE bl_from=$id $options";
1426                 $res = $db->query( $sql, "Title::getBrokenLinksFrom" );
1427                 $retVal = array();
1428                 if ( $db->numRows( $res ) ) {
1429                         while ( $row = $db->fetchObject( $res ) ) {
1430                                 $retVal[] = Title::newFromText( $row->bl_to );
1431                         }
1432                 }
1433                 $db->freeResult( $res );
1434                 return $retVal;
1435         }
1436
1437
1438         /**
1439          * Get a list of URLs to purge from the Squid cache when this
1440          * page changes
1441          *
1442          * @return array the URLs
1443          * @access public
1444          */
1445         function getSquidURLs() {
1446                 return array(
1447                         $this->getInternalURL(),
1448                         $this->getInternalURL( 'action=history' )
1449                 );
1450         }
1451
1452         /**
1453          * Move this page without authentication
1454          * @param Title &$nt the new page Title
1455          * @access public
1456          */
1457         function moveNoAuth( &$nt ) {
1458                 return $this->moveTo( $nt, false );
1459         }
1460
1461         /**
1462          * Check whether a given move operation would be valid.
1463          * Returns true if ok, or a message key string for an error message
1464          * if invalid. (Scarrrrry ugly interface this.)
1465          * @param Title &$nt the new title
1466          * @param bool $auth indicates whether $wgUser's permissions
1467          *      should be checked
1468          * @return mixed true on success, message name on failure
1469          * @access public
1470          */
1471         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1472                 global $wgUser;
1473                 if( !$this or !$nt ) {
1474                         return 'badtitletext';
1475                 }
1476                 if( $this->equals( $nt ) ) {
1477                         return 'selfmove';
1478                 }
1479                 if( !$this->isMovable() || !$nt->isMovable() ) {
1480                         return 'immobile_namespace';
1481                 }
1482
1483                 $fname = 'Title::move';
1484                 $oldid = $this->getArticleID();
1485                 $newid = $nt->getArticleID();
1486
1487                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1488                         return 'articleexists';
1489                 }
1490                 if ( ( '' == $this->getDBkey() ) ||
1491                          ( !$oldid ) ||
1492                      ( '' == $nt->getDBkey() ) ) {
1493                         return 'badarticleerror';
1494                 }
1495
1496                 if ( $auth && (
1497                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1498                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1499                         return 'protectedpage';
1500                 }
1501
1502                 # The move is allowed only if (1) the target doesn't exist, or
1503                 # (2) the target is a redirect to the source, and has no history
1504                 # (so we can undo bad moves right after they're done).
1505
1506                 if ( 0 != $newid ) { # Target exists; check for validity
1507                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1508                                 return 'articleexists';
1509                         }
1510                 }
1511                 return true;
1512         }
1513
1514         /**
1515          * Move a title to a new location
1516          * @param Title &$nt the new title
1517          * @param bool $auth indicates whether $wgUser's permissions
1518          *      should be checked
1519          * @return mixed true on success, message name on failure
1520          * @access public
1521          */
1522         function moveTo( &$nt, $auth = true, $reason = '' ) {
1523                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1524                 if( is_string( $err ) ) {
1525                         return $err;
1526                 }
1527                 if( $nt->exists() ) {
1528                         $this->moveOverExistingRedirect( $nt, $reason );
1529                 } else { # Target didn't exist, do normal move.
1530                         $this->moveToNewTitle( $nt, $newid, $reason );
1531                 }
1532
1533                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1534
1535                 $dbw =& wfGetDB( DB_MASTER );
1536                 $categorylinks = $dbw->tableName( 'categorylinks' );
1537                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1538                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1539                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1540                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1541
1542                 # Update watchlists
1543
1544                 $oldnamespace = $this->getNamespace() & ~1;
1545                 $newnamespace = $nt->getNamespace() & ~1;
1546                 $oldtitle = $this->getDBkey();
1547                 $newtitle = $nt->getDBkey();
1548
1549                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1550                         WatchedItem::duplicateEntries( $this, $nt );
1551                 }
1552
1553                 # Update search engine
1554                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1555                 $u->doUpdate();
1556                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1557                 $u->doUpdate();
1558
1559                 wfRunHooks( 'TitleMoveComplete', array(&$this, &$nt, &$wgUser, $oldid, $newid) );
1560                 return true;
1561         }
1562
1563         /**
1564          * Move page to a title which is at present a redirect to the
1565          * source page
1566          *
1567          * @param Title &$nt the page to move to, which should currently
1568          *      be a redirect
1569          * @access private
1570          */
1571         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1572                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1573                 $fname = 'Title::moveOverExistingRedirect';
1574                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1575
1576                 if ( $reason ) {
1577                         $comment .= ": $reason";
1578                 }
1579
1580                 $now = wfTimestampNow();
1581                 $rand = wfRandom();
1582                 $newid = $nt->getArticleID();
1583                 $oldid = $this->getArticleID();
1584                 $dbw =& wfGetDB( DB_MASTER );
1585                 $links = $dbw->tableName( 'links' );
1586
1587                 # Delete the old redirect. We don't save it to history since
1588                 # by definition if we've got here it's rather uninteresting.
1589                 # We have to remove it so that the next step doesn't trigger
1590                 # a conflict on the unique namespace+title index...
1591                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1592
1593                 # Save a null revision in the page's history notifying of the move
1594                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1595                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1596                         true );
1597                 $nullRevId = $nullRevision->insertOn( $dbw );
1598
1599                 # Change the name of the target page:
1600                 $dbw->update( 'page',
1601                         /* SET */ array(
1602                                 'page_touched'   => $dbw->timestamp($now),
1603                                 'page_namespace' => $nt->getNamespace(),
1604                                 'page_title'     => $nt->getDBkey(),
1605                                 'page_latest'    => $nullRevId,
1606                         ),
1607                         /* WHERE */ array( 'page_id' => $oldid ),
1608                         $fname
1609                 );
1610                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1611
1612                 # Recreate the redirect, this time in the other direction.
1613                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1614                 $redirectArticle = new Article( $this );
1615                 $newid = $redirectArticle->insertOn( $dbw );
1616                 $redirectRevision = new Revision( array(
1617                         'page'    => $newid,
1618                         'comment' => $comment,
1619                         'text'    => $redirectText ) );
1620                 $revid = $redirectRevision->insertOn( $dbw );
1621                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1622                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1623
1624                 # Log the move
1625                 $log = new LogPage( 'move' );
1626                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1627
1628                 # Swap links
1629
1630                 # Load titles and IDs
1631                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1632                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1633
1634                 # Delete them all
1635                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1636                 $dbw->query( $sql, $fname );
1637
1638                 # Reinsert
1639                 if ( count( $linksToOld ) || count( $linksToNew )) {
1640                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1641                         $first = true;
1642
1643                         # Insert links to old title
1644                         foreach ( $linksToOld as $linkTitle ) {
1645                                 if ( $first ) {
1646                                         $first = false;
1647                                 } else {
1648                                         $sql .= ',';
1649                                 }
1650                                 $id = $linkTitle->getArticleID();
1651                                 $sql .= "($id,$newid)";
1652                         }
1653
1654                         # Insert links to new title
1655                         foreach ( $linksToNew as $linkTitle ) {
1656                                 if ( $first ) {
1657                                         $first = false;
1658                                 } else {
1659                                         $sql .= ',';
1660                                 }
1661                                 $id = $linkTitle->getArticleID();
1662                                 $sql .= "($id, $oldid)";
1663                         }
1664
1665                         $dbw->query( $sql, $fname );
1666                 }
1667
1668                 # Now, we record the link from the redirect to the new title.
1669                 # It should have no other outgoing links...
1670                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1671                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1672
1673                 # Clear linkscc
1674                 LinkCache::linksccClearLinksTo( $oldid );
1675                 LinkCache::linksccClearLinksTo( $newid );
1676
1677                 # Purge squid
1678                 if ( $wgUseSquid ) {
1679                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1680                         $u = new SquidUpdate( $urls );
1681                         $u->doUpdate();
1682                 }
1683         }
1684
1685         /**
1686          * Move page to non-existing title.
1687          * @param Title &$nt the new Title
1688          * @param int &$newid set to be the new article ID
1689          * @access private
1690          */
1691         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1692                 global $wgUser, $wgLinkCache, $wgUseSquid;
1693                 global $wgMwRedir;
1694                 $fname = 'MovePageForm::moveToNewTitle';
1695                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1696                 if ( $reason ) {
1697                         $comment .= ": $reason";
1698                 }
1699
1700                 $newid = $nt->getArticleID();
1701                 $oldid = $this->getArticleID();
1702                 $dbw =& wfGetDB( DB_MASTER );
1703                 $now = $dbw->timestamp();
1704                 wfSeedRandom();
1705                 $rand = wfRandom();
1706
1707                 # Save a null revision in the page's history notifying of the move
1708                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1709                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1710                         true );
1711                 $nullRevId = $nullRevision->insertOn( $dbw );
1712
1713                 # Rename cur entry
1714                 $dbw->update( 'page',
1715                         /* SET */ array(
1716                                 'page_touched'   => $now,
1717                                 'page_namespace' => $nt->getNamespace(),
1718                                 'page_title'     => $nt->getDBkey(),
1719                                 'page_latest'    => $nullRevId,
1720                         ),
1721                         /* WHERE */ array( 'page_id' => $oldid ),
1722                         $fname
1723                 );
1724
1725                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1726
1727                 # Insert redirect
1728                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1729                 $redirectArticle = new Article( $this );
1730                 $newid = $redirectArticle->insertOn( $dbw );
1731                 $redirectRevision = new Revision( array(
1732                         'page'    => $newid,
1733                         'comment' => $comment,
1734                         'text'    => $redirectText ) );
1735                 $revid = $redirectRevision->insertOn( $dbw );
1736                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1737                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1738
1739                 # Log the move
1740                 $log = new LogPage( 'move' );
1741                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1742
1743                 # Purge squid and linkscc as per article creation
1744                 Article::onArticleCreate( $nt );
1745
1746                 # Any text links to the old title must be reassigned to the redirect
1747                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1748                 LinkCache::linksccClearLinksTo( $oldid );
1749
1750                 # Record the just-created redirect's linking to the page
1751                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1752
1753                 # Non-existent target may have had broken links to it; these must
1754                 # now be removed and made into good links.
1755                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1756                 $update->fixBrokenLinks();
1757
1758                 # Purge old title from squid
1759                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1760                 $titles = $nt->getLinksTo();
1761                 if ( $wgUseSquid ) {
1762                         $urls = $this->getSquidURLs();
1763                         foreach ( $titles as $linkTitle ) {
1764                                 $urls[] = $linkTitle->getInternalURL();
1765                         }
1766                         $u = new SquidUpdate( $urls );
1767                         $u->doUpdate();
1768                 }
1769         }
1770
1771         /**
1772          * Checks if $this can be moved to a given Title
1773          * - Selects for update, so don't call it unless you mean business
1774          *
1775          * @param Title &$nt the new title to check
1776          * @access public
1777          */
1778         function isValidMoveTarget( $nt ) {
1779
1780                 $fname = 'Title::isValidMoveTarget';
1781                 $dbw =& wfGetDB( DB_MASTER );
1782
1783                 # Is it a redirect?
1784                 $id  = $nt->getArticleID();
1785                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1786                         array( 'page_is_redirect','old_text' ),
1787                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1788                         $fname, 'FOR UPDATE' );
1789
1790                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1791                         # Not a redirect
1792                         return false;
1793                 }
1794
1795                 # Does the redirect point to the source?
1796                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1797                         $redirTitle = Title::newFromText( $m[1] );
1798                         if( !is_object( $redirTitle ) ||
1799                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1800                                 return false;
1801                         }
1802                 }
1803
1804                 # Does the article have a history?
1805                 $row = $dbw->selectRow( array( 'page', 'revision'),
1806                         array( 'rev_id' ),
1807                         array( 'page_namespace' => $nt->getNamespace(),
1808                                 'page_title' => $nt->getDBkey(),
1809                                 'page_id=rev_page AND page_latest != rev_id'
1810                         ), $fname, 'FOR UPDATE'
1811                 );
1812
1813                 # Return true if there was no history
1814                 return $row === false;
1815         }
1816
1817         /**
1818          * Create a redirect; fails if the title already exists; does
1819          * not notify RC
1820          *
1821          * @param Title $dest the destination of the redirect
1822          * @param string $comment the comment string describing the move
1823          * @return bool true on success
1824          * @access public
1825          */
1826         function createRedirect( $dest, $comment ) {
1827                 global $wgUser;
1828                 if ( $this->getArticleID() ) {
1829                         return false;
1830                 }
1831
1832                 $fname = 'Title::createRedirect';
1833                 $dbw =& wfGetDB( DB_MASTER );
1834
1835                 $article = new Article( $this );
1836                 $newid = $article->insertOn( $dbw );
1837                 $revision = new Revision( array(
1838                         'page'      => $newid,
1839                         'comment'   => $comment,
1840                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1841                         ) );
1842                 $revisionId = $revision->insertOn( $dbw );
1843                 $article->updateRevisionOn( $dbw, $revision, 0 );
1844
1845                 # Link table
1846                 if ( $dest->getArticleID() ) {
1847                         $dbw->insert( 'links',
1848                                 array(
1849                                         'l_to' => $dest->getArticleID(),
1850                                         'l_from' => $newid
1851                                 ), $fname
1852                         );
1853                 } else {
1854                         $dbw->insert( 'brokenlinks',
1855                                 array(
1856                                         'bl_to' => $dest->getPrefixedDBkey(),
1857                                         'bl_from' => $newid
1858                                 ), $fname
1859                         );
1860                 }
1861
1862                 Article::onArticleCreate( $this );
1863                 return true;
1864         }
1865
1866         /**
1867          * Get categories to which this Title belongs and return an array of
1868          * categories' names.
1869          *
1870          * @return array an array of parents in the form:
1871          *      $parent => $currentarticle
1872          * @access public
1873          */
1874         function getParentCategories() {
1875                 global $wgContLang,$wgUser;
1876
1877                 $titlekey = $this->getArticleId();
1878                 $sk =& $wgUser->getSkin();
1879                 $parents = array();
1880                 $dbr =& wfGetDB( DB_SLAVE );
1881                 $categorylinks = $dbr->tableName( 'categorylinks' );
1882
1883                 # NEW SQL
1884                 $sql = "SELECT * FROM $categorylinks"
1885                      ." WHERE cl_from='$titlekey'"
1886                          ." AND cl_from <> '0'"
1887                          ." ORDER BY cl_sortkey";
1888
1889                 $res = $dbr->query ( $sql ) ;
1890
1891                 if($dbr->numRows($res) > 0) {
1892                         while ( $x = $dbr->fetchObject ( $res ) )
1893                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1894                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1895                         $dbr->freeResult ( $res ) ;
1896                 } else {
1897                         $data = '';
1898                 }
1899                 return $data;
1900         }
1901
1902         /**
1903          * Get a tree of parent categories
1904          * @param array $children an array with the children in the keys, to check for circular refs
1905          * @return array
1906          * @access public
1907          */
1908         function getParentCategoryTree( $children = array() ) {
1909                 $parents = $this->getParentCategories();
1910
1911                 if($parents != '') {
1912                         foreach($parents as $parent => $current)
1913                         {
1914                                 if ( array_key_exists( $parent, $children ) ) {
1915                                         # Circular reference
1916                                         $stack[$parent] = array();
1917                                 } else {
1918                                         $nt = Title::newFromText($parent);
1919                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1920                                 }
1921                         }
1922                         return $stack;
1923                 } else {
1924                         return array();
1925                 }
1926         }
1927
1928
1929         /**
1930          * Get an associative array for selecting this title from
1931          * the "cur" table
1932          *
1933          * @return array
1934          * @access public
1935          */
1936         function curCond() {
1937                 wfDebugDieBacktrace( 'curCond called' );
1938                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1939         }
1940
1941         /**
1942          * Get an associative array for selecting this title from the
1943          * "old" table
1944          *
1945          * @return array
1946          * @access public
1947          */
1948         function oldCond() {
1949                 wfDebugDieBacktrace( 'oldCond called' );
1950                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1951         }
1952
1953         /**
1954          * Get the revision ID of the previous revision
1955          *
1956          * @param integer $revision  Revision ID. Get the revision that was before this one.
1957          * @return interger $oldrevision|false
1958          */
1959         function getPreviousRevisionID( $revision ) {
1960                 $dbr =& wfGetDB( DB_SLAVE );
1961                 return $dbr->selectField( 'revision', 'rev_id',
1962                         'rev_page=' . IntVal( $this->getArticleId() ) .
1963                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1964         }
1965
1966         /**
1967          * Get the revision ID of the next revision
1968          *
1969          * @param integer $revision  Revision ID. Get the revision that was after this one.
1970          * @return interger $oldrevision|false
1971          */
1972         function getNextRevisionID( $revision ) {
1973                 $dbr =& wfGetDB( DB_SLAVE );
1974                 return $dbr->selectField( 'revision', 'rev_id',
1975                         'rev_page=' . IntVal( $this->getArticleId() ) .
1976                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1977         }
1978
1979         /**
1980          * Compare with another title.
1981          *
1982          * @param Title $title
1983          * @return bool
1984          */
1985         function equals( &$title ) {
1986                 return $this->getInterwiki() == $title->getInterwiki()
1987                         && $this->getNamespace() == $title->getNamespace()
1988                         && $this->getDbkey() == $title->getDbkey();
1989         }
1990
1991         /**
1992          * Check if page exists
1993          * @return bool
1994          */
1995         function exists() {
1996                 return $this->getArticleId() != 0;
1997         }
1998
1999         /**
2000          * Should a link should be displayed as a known link, just based on its title?
2001          *
2002          * Currently, a self-link with a fragment, special pages and image pages are in
2003          * this category. Special pages never exist in the database. Some images do not
2004          * have description pages in the database, but the description page contains
2005          * useful history information that the user may want to link to.
2006          *
2007          */
2008         function isAlwaysKnown() {
2009                 return ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2010                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2011         }
2012 }
2013 ?>