includes/Title.php

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