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