includes/Title.php

   1 <?php
   2 /**
   3  * $Id$
   4  * See title.doc
   5  *
   6  * @package MediaWiki
   7  */
   8
   9 /** */
  10 require_once( 'normal/UtfNormal.php' );
  11
  12 $wgTitleInterwikiCache = array();
  13 define ( 'GAID_FOR_UPDATE', 1 );
  14
  15 /**
  16  * Title class
  17  * - Represents a title, which may contain an interwiki designation or namespace
  18  * - Can fetch various kinds of data from the database, albeit inefficiently.
  19  *
  20  * @package MediaWiki
  21  */
  22 class Title {
  23         /**
  24          * All member variables should be considered private
  25          * Please use the accessor functions
  26          */
  27
  28          /**#@+
  29          * @access private
  30          */
  31
  32         var $mTextform;           # Text form (spaces not underscores) of the main part
  33         var $mUrlform;            # URL-encoded form of the main part
  34         var $mDbkeyform;          # Main part with underscores
  35         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  36         var $mInterwiki;          # Interwiki prefix (or null string)
  37         var $mFragment;           # Title fragment (i.e. the bit after the #)
  38         var $mArticleID;          # Article ID, fetched from the link cache on demand
  39         var $mRestrictions;       # Array of groups allowed to edit this article
  40                               # Only null or "sysop" are supported
  41         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  42         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  43         var $mDefaultNamespace;   # Namespace index when there is no namespace
  44                               # Zero except in {{transclusion}} tags
  45         /**#@-*/
  46
  47
  48         /**
  49          * Constructor
  50          * @access private
  51          */
  52         /* private */ function Title() {
  53                 $this->mInterwiki = $this->mUrlform =
  54                 $this->mTextform = $this->mDbkeyform = '';
  55                 $this->mArticleID = -1;
  56                 $this->mNamespace = 0;
  57                 $this->mRestrictionsLoaded = false;
  58                 $this->mRestrictions = array();
  59                 $this->mDefaultNamespace = 0;
  60         }
  61
  62         /**
  63          * Create a new Title from a prefixed DB key
  64          * @param string $key The database key, which has underscores
  65          *      instead of spaces, possibly including namespace and
  66          *      interwiki prefixes
  67          * @return Title the new object, or NULL on an error
  68          * @static
  69          * @access public
  70          */
  71         /* static */ function newFromDBkey( $key ) {
  72                 $t = new Title();
  73                 $t->mDbkeyform = $key;
  74                 if( $t->secureAndSplit() )
  75                         return $t;
  76                 else
  77                         return NULL;
  78         }
  79
  80         /**
  81          * Create a new Title from text, such as what one would
  82          * find in a link. Decodes any HTML entities in the text.
  83          *
  84          * @param string $text the link text; spaces, prefixes,
  85          *      and an initial ':' indicating the main namespace
  86          *      are accepted
  87          * @param int $defaultNamespace the namespace to use if
  88          *      none is specified by a prefix
  89          * @return Title the new object, or NULL on an error
  90          * @static
  91          * @access public
  92          */
  93         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  94                 $fname = 'Title::newFromText';
  95                 wfProfileIn( $fname );
  96
  97                 if( is_object( $text ) ) {
  98                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  99                 }
 100                 global $wgInputEncoding;
 101                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 102
 103                 $text = wfMungeToUtf8( $text );
 104
 105
 106                 # What was this for? TS 2004-03-03
 107                 # $text = urldecode( $text );
 108
 109                 $t = new Title();
 110                 $t->mDbkeyform = str_replace( ' ', '_', $text );
 111                 $t->mDefaultNamespace = $defaultNamespace;
 112
 113                 wfProfileOut( $fname );
 114                 if ( !is_object( $t ) ) {
 115                         var_dump( debug_backtrace() );
 116                 }
 117                 if( $t->secureAndSplit() ) {
 118                         return $t;
 119                 } else {
 120                         return NULL;
 121                 }
 122         }
 123
 124         /**
 125          * Create a new Title from URL-encoded text. Ensures that
 126          * the given title's length does not exceed the maximum.
 127          * @param string $url the title, as might be taken from a URL
 128          * @return Title the new object, or NULL on an error
 129          * @static
 130          * @access public
 131          */
 132         /* static */ function newFromURL( $url ) {
 133                 global $wgLang, $wgServer;
 134                 $t = new Title();
 135
 136                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 137                 # but some URLs used it as a space replacement and they still come
 138                 # from some external search tools.
 139                 $s = str_replace( '+', ' ', $url );
 140
 141                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 142                 if( $t->secureAndSplit() ) {
 143                         return $t;
 144                 } else {
 145                         return NULL;
 146                 }
 147         }
 148
 149         /**
 150          * Create a new Title from an article ID
 151          * @todo This is inefficiently implemented, the cur row is requested
 152          * but not used for anything else
 153          * @param int $id the cur_id corresponding to the Title to create
 154          * @return Title the new object, or NULL on an error
 155          * @access public
 156          */
 157         /* static */ function newFromID( $id ) {
 158                 $fname = 'Title::newFromID';
 159                 $dbr =& wfGetDB( DB_SLAVE );
 160                 $row = $dbr->selectRow( 'cur', array( 'cur_namespace', 'cur_title' ),
 161                         array( 'cur_id' => $id ), $fname );
 162                 if ( $row !== false ) {
 163                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 164                 } else {
 165                         $title = NULL;
 166                 }
 167                 return $title;
 168         }
 169
 170         /**
 171          * Create a new Title from a namespace index and a DB key.
 172          * It's assumed that $ns and $title are *valid*, for instance when
 173          * they came directly from the database or a special page name.
 174          * @param int $ns the namespace of the article
 175          * @param string $title the unprefixed database key form
 176          * @return Title the new object
 177          * @static
 178          * @access public
 179          */
 180         /* static */ function &makeTitle( $ns, $title ) {
 181                 $t =& new Title();
 182                 $t->mInterwiki = '';
 183                 $t->mFragment = '';
 184                 $t->mNamespace = IntVal( $ns );
 185                 $t->mDbkeyform = $title;
 186                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 187                 $t->mUrlform = wfUrlencode( $title );
 188                 $t->mTextform = str_replace( '_', ' ', $title );
 189                 return $t;
 190         }
 191
 192         /**
 193          * Create a new Title frrom a namespace index and a DB key.
 194          * The parameters will be checked for validity, which is a bit slower
 195          * than makeTitle() but safer for user-provided data.
 196          * @param int $ns the namespace of the article
 197          * @param string $title the database key form
 198          * @return Title the new object, or NULL on an error
 199          * @static
 200          * @access public
 201          */
 202         /* static */ function makeTitleSafe( $ns, $title ) {
 203                 $t = new Title();
 204                 $t->mDbkeyform = Title::makeName( $ns, $title );
 205                 if( $t->secureAndSplit() ) {
 206                         return $t;
 207                 } else {
 208                         return NULL;
 209                 }
 210         }
 211
 212         /**
 213          * Create a new Title for the Main Page
 214          * @static
 215          * @return Title the new object
 216          * @access public
 217          */
 218         /* static */ function newMainPage() {
 219                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 220         }
 221
 222         /**
 223          * Create a new Title for a redirect
 224          * @param string $text the redirect title text
 225          * @return Title the new object, or NULL if the text is not a
 226          *      valid redirect
 227          * @static
 228          * @access public
 229          */
 230         /* static */ function newFromRedirect( $text ) {
 231                 global $wgMwRedir;
 232                 $rt = NULL;
 233                 if ( $wgMwRedir->matchStart( $text ) ) {
 234                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 235                                 # categories are escaped using : for example one can enter:
 236                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 237                                 if ( substr($m[1],0,1) == ':') {
 238                                         # We don't want to keep the ':'
 239                                         $m[1] = substr( $m[1], 1 );
 240                                 }
 241
 242                                 $rt = Title::newFromText( $m[1] );
 243                                 # Disallow redirects to Special:Userlogout
 244                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 245                                         $rt = NULL;
 246                                 }
 247                         }
 248                 }
 249                 return $rt;
 250         }
 251
 252 #----------------------------------------------------------------------------
 253 #       Static functions
 254 #----------------------------------------------------------------------------
 255
 256         /**
 257          * Get the prefixed DB key associated with an ID
 258          * @param int $id the cur_id of the article
 259          * @return Title an object representing the article, or NULL
 260          *      if no such article was found
 261          * @static
 262          * @access public
 263          */
 264         /* static */ function nameOf( $id ) {
 265                 $fname = 'Title::nameOf';
 266                 $dbr =& wfGetDB( DB_SLAVE );
 267
 268                 $s = $dbr->selectRow( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 269                 if ( $s === false ) { return NULL; }
 270
 271                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 272                 return $n;
 273         }
 274
 275         /**
 276          * Get a regex character class describing the legal characters in a link
 277          * @return string the list of characters, not delimited
 278          * @static
 279          * @access public
 280          */
 281         /* static */ function legalChars() {
 282                 # Missing characters:
 283                 #  * []|# Needed for link syntax
 284                 #  * % and + are corrupted by Apache when they appear in the path
 285                 #
 286                 # % seems to work though
 287                 #
 288                 # The problem with % is that URLs are double-unescaped: once by Apache's
 289                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 290                 # Our code does not double-escape to compensate for this, indeed double escaping
 291                 # would break if the double-escaped title was passed in the query string
 292                 # rather than the path. This is a minor security issue because articles can be
 293                 # created such that they are hard to view or edit. -- TS
 294                 #
 295                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 296                 # this breaks interlanguage links
 297
 298                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 299                 return $set;
 300         }
 301
 302         /**
 303          * Get a string representation of a title suitable for
 304          * including in a search index
 305          *
 306          * @param int $ns a namespace index
 307          * @param string $title text-form main part
 308          * @return string a stripped-down title string ready for the
 309          *      search index
 310          */
 311         /* static */ function indexTitle( $ns, $title ) {
 312                 global $wgDBminWordLen, $wgContLang;
 313                 require_once( 'SearchEngine.php' );
 314
 315                 $lc = SearchEngine::legalSearchChars() . '&#;';
 316                 $t = $wgContLang->stripForSearch( $title );
 317                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 318                 $t = strtolower( $t );
 319
 320                 # Handle 's, s'
 321                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 322                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 323
 324                 $t = preg_replace( "/\\s+/", ' ', $t );
 325
 326                 if ( $ns == Namespace::getImage() ) {
 327                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 328                 }
 329                 return trim( $t );
 330         }
 331
 332         /*
 333          * Make a prefixed DB key from a DB key and a namespace index
 334          * @param int $ns numerical representation of the namespace
 335          * @param string $title the DB key form the title
 336          * @return string the prefixed form of the title
 337          */
 338         /* static */ function makeName( $ns, $title ) {
 339                 global $wgContLang;
 340
 341                 $n = $wgContLang->getNsText( $ns );
 342                 if ( '' == $n ) { return $title; }
 343                 else { return $n.':'.$title; }
 344         }
 345
 346         /**
 347          * Returns the URL associated with an interwiki prefix
 348          * @param string $key the interwiki prefix (e.g. "MeatBall")
 349          * @return the associated URL, containing "$1", which should be
 350          *      replaced by an article title
 351          * @static (arguably)
 352          * @access public
 353          */
 354         function getInterwikiLink( $key ) {
 355                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 356                 $fname = 'Title::getInterwikiLink';
 357                 $k = $wgDBname.':interwiki:'.$key;
 358
 359                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 360                         return $wgTitleInterwikiCache[$k]->iw_url;
 361
 362                 $s = $wgMemc->get( $k );
 363                 # Ignore old keys with no iw_local
 364                 if( $s && isset( $s->iw_local ) ) {
 365                         $wgTitleInterwikiCache[$k] = $s;
 366                         return $s->iw_url;
 367                 }
 368                 $dbr =& wfGetDB( DB_SLAVE );
 369                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 370                 if(!$res) return '';
 371
 372                 $s = $dbr->fetchObject( $res );
 373                 if(!$s) {
 374                         # Cache non-existence: create a blank object and save it to memcached
 375                         $s = (object)false;
 376                         $s->iw_url = '';
 377                         $s->iw_local = 0;
 378                 }
 379                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 380                 $wgTitleInterwikiCache[$k] = $s;
 381                 return $s->iw_url;
 382         }
 383
 384         /**
 385          * Determine whether the object refers to a page within
 386          * this project.
 387          *
 388          * @return bool TRUE if this is an in-project interwiki link
 389          *      or a wikilink, FALSE otherwise
 390          * @access public
 391          */
 392         function isLocal() {
 393                 global $wgTitleInterwikiCache, $wgDBname;
 394
 395                 if ( $this->mInterwiki != '' ) {
 396                         # Make sure key is loaded into cache
 397                         $this->getInterwikiLink( $this->mInterwiki );
 398                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 399                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 400                 } else {
 401                         return true;
 402                 }
 403         }
 404
 405         /**
 406          * Update the cur_touched field for an array of title objects
 407          * @todo Inefficient unless the IDs are already loaded into the
 408          *      link cache
 409          * @param array $titles an array of Title objects to be touched
 410          * @param string $timestamp the timestamp to use instead of the
 411          *      default current time
 412          * @static
 413          * @access public
 414          */
 415         /* static */ function touchArray( $titles, $timestamp = '' ) {
 416                 if ( count( $titles ) == 0 ) {
 417                         return;
 418                 }
 419                 $dbw =& wfGetDB( DB_MASTER );
 420                 if ( $timestamp == '' ) {
 421                         $timestamp = $dbw->timestamp();
 422                 }
 423                 $cur = $dbw->tableName( 'cur' );
 424                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 425                 $first = true;
 426
 427                 foreach ( $titles as $title ) {
 428                         if ( ! $first ) {
 429                                 $sql .= ',';
 430                         }
 431                         $first = false;
 432                         $sql .= $title->getArticleID();
 433                 }
 434                 $sql .= ')';
 435                 if ( ! $first ) {
 436                         $dbw->query( $sql, 'Title::touchArray' );
 437                 }
 438         }
 439
 440 #----------------------------------------------------------------------------
 441 #       Other stuff
 442 #----------------------------------------------------------------------------
 443
 444         /** Simple accessors */
 445         /**
 446          * Get the text form (spaces not underscores) of the main part
 447          * @return string
 448          * @access public
 449          */
 450         function getText() { return $this->mTextform; }
 451         /**
 452          * Get the URL-encoded form of the main part
 453          * @return string
 454          * @access public
 455          */
 456         function getPartialURL() { return $this->mUrlform; }
 457         /**
 458          * Get the main part with underscores
 459          * @return string
 460          * @access public
 461          */
 462         function getDBkey() { return $this->mDbkeyform; }
 463         /**
 464          * Get the namespace index, i.e. one of the NS_xxxx constants
 465          * @return int
 466          * @access public
 467          */
 468         function getNamespace() { return $this->mNamespace; }
 469         /**
 470          * Set the namespace index
 471          * @param int $n the namespace index, one of the NS_xxxx constants
 472          * @access public
 473          */
 474         function setNamespace( $n ) { $this->mNamespace = IntVal( $n ); }
 475         /**
 476          * Get the interwiki prefix (or null string)
 477          * @return string
 478          * @access public
 479          */
 480         function getInterwiki() { return $this->mInterwiki; }
 481         /**
 482          * Get the Title fragment (i.e. the bit after the #)
 483          * @return string
 484          * @access public
 485          */
 486         function getFragment() { return $this->mFragment; }
 487         /**
 488          * Get the default namespace index, for when there is no namespace
 489          * @return int
 490          * @access public
 491          */
 492         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 493
 494         /**
 495          * Get title for search index
 496          * @return string a stripped-down title string ready for the
 497          *      search index
 498          */
 499         function getIndexTitle() {
 500                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 501         }
 502
 503         /**
 504          * Get the prefixed database key form
 505          * @return string the prefixed title, with underscores and
 506          *      any interwiki and namespace prefixes
 507          * @access public
 508          */
 509         function getPrefixedDBkey() {
 510                 $s = $this->prefix( $this->mDbkeyform );
 511                 $s = str_replace( ' ', '_', $s );
 512                 return $s;
 513         }
 514
 515         /**
 516          * Get the prefixed title with spaces.
 517          * This is the form usually used for display
 518          * @return string the prefixed title, with spaces
 519          * @access public
 520          */
 521         function getPrefixedText() {
 522                 global $wgContLang;
 523                 if ( empty( $this->mPrefixedText ) ) {
 524                         $s = $this->prefix( $this->mTextform );
 525                         $s = str_replace( '_', ' ', $s );
 526                         $this->mPrefixedText = $s;
 527                 }
 528                 return $this->mPrefixedText;
 529         }
 530
 531         /**
 532          * Get the prefixed title with spaces, plus any fragment
 533          * (part beginning with '#')
 534          * @return string the prefixed title, with spaces and
 535          *      the fragment, including '#'
 536          * @access public
 537          */
 538         function getFullText() {
 539                 global $wgContLang;
 540                 $text = $this->getPrefixedText();
 541                 if( '' != $this->mFragment ) {
 542                         $text .= '#' . $this->mFragment;
 543                 }
 544                 return $text;
 545         }
 546
 547         /**
 548          * Get a URL-encoded title (not an actual URL) including interwiki
 549          * @return string the URL-encoded form
 550          * @access public
 551          */
 552         function getPrefixedURL() {
 553                 $s = $this->prefix( $this->mDbkeyform );
 554                 $s = str_replace( ' ', '_', $s );
 555
 556                 $s = wfUrlencode ( $s ) ;
 557
 558                 # Cleaning up URL to make it look nice -- is this safe?
 559                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 560                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 561                 $s = str_replace( '%28', '(', $s );
 562                 $s = str_replace( '%29', ')', $s );
 563
 564                 return $s;
 565         }
 566
 567         /**
 568          * Get a real URL referring to this title, with interwiki link and
 569          * fragment
 570          *
 571          * @param string $query an optional query string, not used
 572          *      for interwiki links
 573          * @return string the URL
 574          * @access public
 575          */
 576         function getFullURL( $query = '' ) {
 577                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 578
 579                 if ( '' == $this->mInterwiki ) {
 580                         $p = $wgArticlePath;
 581                         return $wgServer . $this->getLocalUrl( $query );
 582                 } else {
 583                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 584                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 585                         if ( '' != $namespace ) {
 586                                 # Can this actually happen? Interwikis shouldn't be parsed.
 587                                 $namepace .= ':';
 588                         }
 589                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 590                         if ( '' != $this->mFragment ) {
 591                                 $url .= '#' . $this->mFragment;
 592                         }
 593                         return $url;
 594                 }
 595         }
 596
 597         /**
 598          * @deprecated
 599          */
 600         function getURL() {
 601                 die( 'Call to obsolete obsolete function Title::getURL()' );
 602         }
 603
 604         /**
 605          * Get a URL with no fragment or server name
 606          * @param string $query an optional query string; if not specified,
 607          *      $wgArticlePath will be used.
 608          * @return string the URL
 609          * @access public
 610          */
 611         function getLocalURL( $query = '' ) {
 612                 global $wgLang, $wgArticlePath, $wgScript;
 613
 614                 if ( $this->isExternal() ) {
 615                         return $this->getFullURL();
 616                 }
 617
 618                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 619                 if ( $query == '' ) {
 620                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 621                 } else {
 622                         if ( $query == '-' ) {
 623                                 $query = '';
 624                         }
 625                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 626                 }
 627                 return $url;
 628         }
 629
 630         /**
 631          * Get an HTML-escaped version of the URL form, suitable for
 632          * using in a link, without a server name or fragment
 633          * @param string $query an optional query string
 634          * @return string the URL
 635          * @access public
 636          */
 637         function escapeLocalURL( $query = '' ) {
 638                 return htmlspecialchars( $this->getLocalURL( $query ) );
 639         }
 640
 641         /**
 642          * Get an HTML-escaped version of the URL form, suitable for
 643          * using in a link, including the server name and fragment
 644          *
 645          * @return string the URL
 646          * @param string $query an optional query string
 647          * @access public
 648          */
 649         function escapeFullURL( $query = '' ) {
 650                 return htmlspecialchars( $this->getFullURL( $query ) );
 651         }
 652
 653         /**
 654          * Get the URL form for an internal link.
 655          * - Used in various Squid-related code, in case we have a different
 656          * internal hostname for the server from the exposed one.
 657          *
 658          * @param string $query an optional query string
 659          * @return string the URL
 660          * @access public
 661          */
 662         function getInternalURL( $query = '' ) {
 663                 global $wgInternalServer;
 664                 return $wgInternalServer . $this->getLocalURL( $query );
 665         }
 666
 667         /**
 668          * Get the edit URL for this Title
 669          * @return string the URL, or a null string if this is an
 670          *      interwiki link
 671          * @access public
 672          */
 673         function getEditURL() {
 674                 global $wgServer, $wgScript;
 675
 676                 if ( '' != $this->mInterwiki ) { return ''; }
 677                 $s = $this->getLocalURL( 'action=edit' );
 678
 679                 return $s;
 680         }
 681
 682         /**
 683          * Get the HTML-escaped displayable text form.
 684          * Used for the title field in <a> tags.
 685          * @return string the text, including any prefixes
 686          * @access public
 687          */
 688         function getEscapedText() {
 689                 return htmlspecialchars( $this->getPrefixedText() );
 690         }
 691
 692         /**
 693          * Is this Title interwiki?
 694          * @return boolean
 695          * @access public
 696          */
 697         function isExternal() { return ( '' != $this->mInterwiki ); }
 698
 699         /**
 700          * Does the title correspond to a protected article?
 701          * @return boolean
 702          * @access public
 703          */
 704         function isProtected() {
 705                 if ( -1 == $this->mNamespace ) { return true; }
 706                 $a = $this->getRestrictions();
 707                 if ( in_array( 'sysop', $a ) ) { return true; }
 708                 return false;
 709         }
 710
 711         /**
 712          * Is the page a log page, i.e. one where the history is messed up by
 713          * LogPage.php? This used to be used for suppressing diff links in
 714          * recent changes, but now that's done by setting a flag in the
 715          * recentchanges table. Hence, this probably is no longer used.
 716          *
 717          * @deprecated
 718          * @access public
 719          */
 720         function isLog() {
 721                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 722                         return false;
 723                 }
 724                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 725                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 726                         return true;
 727                 }
 728                 return false;
 729         }
 730
 731         /**
 732          * Is $wgUser is watching this page?
 733          * @return boolean
 734          * @access public
 735          */
 736         function userIsWatching() {
 737                 global $wgUser;
 738
 739                 if ( -1 == $this->mNamespace ) { return false; }
 740                 if ( 0 == $wgUser->getID() ) { return false; }
 741
 742                 return $wgUser->isWatched( $this );
 743         }
 744
 745         /**
 746          * Can $wgUser edit this page?
 747          * @return boolean
 748          * @access public
 749          */
 750         function userCanEdit() {
 751                 global $wgUser;
 752                 if( NS_SPECIAL == $this->mNamespace ) {
 753                         return false;
 754                 }
 755                 if( NS_MEDIAWIKI == $this->mNamespace &&
 756                     !$wgUser->isAllowed('editinterface') ) {
 757                         return false;
 758                 }
 759                 if( $this->mDbkeyform == '_' ) {
 760                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 761                         return false;
 762                 }
 763
 764                 # protect global styles and js
 765                 if ( NS_MEDIAWIKI == $this->mNamespace
 766                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 767                      && !$wgUser->isAllowed('editinterface') ) {
 768                         return false;
 769                 }
 770
 771                 # protect css/js subpages of user pages
 772                 # XXX: this might be better using restrictions
 773                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 774                 if( NS_USER == $this->mNamespace
 775                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 776                         && !$wgUser->isAllowed('editinterface')
 777                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 778                         return false;
 779                 }
 780
 781                 foreach( $this->getRestrictions() as $right ) {
 782                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 783                                 return false;
 784                         }
 785                 }
 786                 return true;
 787         }
 788
 789         /**
 790          * Can $wgUser read this page?
 791          * @return boolean
 792          * @access public
 793          */
 794         function userCanRead() {
 795                 global $wgUser;
 796
 797                 if( $wgUser->isAllowed('read') ) {
 798                         return true;
 799                 } else {
 800                         global $wgWhitelistRead;
 801
 802                         /** If anon users can create an account,
 803                             they need to reach the login page first! */
 804                         if( $wgUser->isAllowed( 'createaccount' )
 805                             && $this->mId == NS_SPECIAL
 806                             && $this->getText() == 'Userlogin' ) {
 807                                 return true;
 808                         }
 809
 810                         /** some pages are explicitly allowed */
 811                         $name = $this->getPrefixedText();
 812                         if( in_array( $name, $wgWhitelistRead ) ) {
 813                                 return true;
 814                         }
 815
 816                         # Compatibility with old settings
 817                         if( $this->getNamespace() == NS_MAIN ) {
 818                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 819                                         return true;
 820                                 }
 821                         }
 822                 }
 823                 return false;
 824         }
 825
 826         /**
 827          * Is this a .css or .js subpage of a user page?
 828          * @return bool
 829          * @access public
 830          */
 831         function isCssJsSubpage() {
 832                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 833         }
 834         /**
 835          * Is this a .css subpage of a user page?
 836          * @return bool
 837          * @access public
 838          */
 839         function isCssSubpage() {
 840                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 841         }
 842         /**
 843          * Is this a .js subpage of a user page?
 844          * @return bool
 845          * @access public
 846          */
 847         function isJsSubpage() {
 848                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 849         }
 850         /**
 851          * Protect css/js subpages of user pages: can $wgUser edit
 852          * this page?
 853          *
 854          * @return boolean
 855          * @todo XXX: this might be better using restrictions
 856          * @access public
 857          */
 858         function userCanEditCssJsSubpage() {
 859                 global $wgUser;
 860                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 861         }
 862
 863         /**
 864          * Accessor/initialisation for mRestrictions
 865          * @return array the array of groups allowed to edit this article
 866          * @access public
 867          */
 868         function getRestrictions() {
 869                 $id = $this->getArticleID();
 870                 if ( 0 == $id ) { return array(); }
 871
 872                 if ( ! $this->mRestrictionsLoaded ) {
 873                         $dbr =& wfGetDB( DB_SLAVE );
 874                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 875                         $this->mRestrictions = explode( ',', trim( $res ) );
 876                         $this->mRestrictionsLoaded = true;
 877                 }
 878                 return $this->mRestrictions;
 879         }
 880
 881         /**
 882          * Is there a version of this page in the deletion archive?
 883          * @return int the number of archived revisions
 884          * @access public
 885          */
 886         function isDeleted() {
 887                 $fname = 'Title::isDeleted';
 888                 $dbr =& wfGetDB( DB_SLAVE );
 889                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 890                         'ar_title' => $this->getDBkey() ), $fname );
 891                 return (int)$n;
 892         }
 893
 894         /**
 895          * Get the article ID for this Title from the link cache,
 896          * adding it if necessary
 897          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 898          *      for update
 899          * @return int the ID
 900          * @access public
 901          */
 902         function getArticleID( $flags = 0 ) {
 903                 global $wgLinkCache;
 904
 905                 if ( $flags & GAID_FOR_UPDATE ) {
 906                         $oldUpdate = $wgLinkCache->forUpdate( true );
 907                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 908                         $wgLinkCache->forUpdate( $oldUpdate );
 909                 } else {
 910                         if ( -1 == $this->mArticleID ) {
 911                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 912                         }
 913                 }
 914                 return $this->mArticleID;
 915         }
 916
 917         /**
 918          * This clears some fields in this object, and clears any associated
 919          * keys in the "bad links" section of $wgLinkCache.
 920          *
 921          * - This is called from Article::insertNewArticle() to allow
 922          * loading of the new cur_id. It's also called from
 923          * Article::doDeleteArticle()
 924          *
 925          * @param int $newid the new Article ID
 926          * @access public
 927          */
 928         function resetArticleID( $newid ) {
 929                 global $wgLinkCache;
 930                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 931
 932                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 933                 else { $this->mArticleID = $newid; }
 934                 $this->mRestrictionsLoaded = false;
 935                 $this->mRestrictions = array();
 936         }
 937
 938         /**
 939          * Updates cur_touched for this page; called from LinksUpdate.php
 940          * @return bool true if the update succeded
 941          * @access public
 942          */
 943         function invalidateCache() {
 944                 $now = wfTimestampNow();
 945                 $dbw =& wfGetDB( DB_MASTER );
 946                 $success = $dbw->update( 'cur',
 947                         array( /* SET */
 948                                 'cur_touched' => $dbw->timestamp()
 949                         ), array( /* WHERE */
 950                                 'cur_namespace' => $this->getNamespace() ,
 951                                 'cur_title' => $this->getDBkey()
 952                         ), 'Title::invalidateCache'
 953                 );
 954                 return $success;
 955         }
 956
 957         /**
 958          * Prefix some arbitrary text with the namespace or interwiki prefix
 959          * of this object
 960          *
 961          * @param string $name the text
 962          * @return string the prefixed text
 963          * @access private
 964          */
 965         /* private */ function prefix( $name ) {
 966                 global $wgContLang;
 967
 968                 $p = '';
 969                 if ( '' != $this->mInterwiki ) {
 970                         $p = $this->mInterwiki . ':';
 971                 }
 972                 if ( 0 != $this->mNamespace ) {
 973                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 974                 }
 975                 return $p . $name;
 976         }
 977
 978         /**
 979          * Secure and split - main initialisation function for this object
 980          *
 981          * Assumes that mDbkeyform has been set, and is urldecoded
 982          * and uses underscores, but not otherwise munged.  This function
 983          * removes illegal characters, splits off the interwiki and
 984          * namespace prefixes, sets the other forms, and canonicalizes
 985          * everything.
 986          * @return bool true on success
 987          * @access private
 988          */
 989         /* private */ function secureAndSplit()
 990         {
 991                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 992                 $fname = 'Title::secureAndSplit';
 993                 wfProfileIn( $fname );
 994
 995                 static $imgpre = false;
 996                 static $rxTc = false;
 997
 998                 # Initialisation
 999                 if ( $imgpre === false ) {
1000                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
1001                         # % is needed as well
1002                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/';
1003                 }
1004
1005                 $this->mInterwiki = $this->mFragment = '';
1006                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1007
1008                 # Clean up whitespace
1009                 #
1010                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
1011                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
1012
1013                 if ( '' == $t ) {
1014                         wfProfileOut( $fname );
1015                         return false;
1016                 }
1017
1018                 global $wgUseLatin1;
1019                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1020                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1021                         wfProfileOut( $fname );
1022                         return false;
1023                 }
1024
1025                 $this->mDbkeyform = $t;
1026                 $done = false;
1027
1028                 # :Image: namespace
1029                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1030                         $t = substr( $t, 1 );
1031                 }
1032
1033                 # Initial colon indicating main namespace
1034                 if ( ':' == $t{0} ) {
1035                         $r = substr( $t, 1 );
1036                         $this->mNamespace = NS_MAIN;
1037                 } else {
1038                         # Namespace or interwiki prefix
1039                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1040                                 #$p = strtolower( $m[1] );
1041                                 $p = $m[1];
1042                                 $lowerNs = strtolower( $p );
1043                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1044                                         # Canonical namespace
1045                                         $t = $m[2];
1046                                         $this->mNamespace = $ns;
1047                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1048                                         # Ordinary namespace
1049                                         $t = $m[2];
1050                                         $this->mNamespace = $ns;
1051                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1052                                         # Interwiki link
1053                                         $t = $m[2];
1054                                         $this->mInterwiki = $p;
1055
1056                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1057                                                 $done = true;
1058                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1059                                                 $done = true;
1060                                         }
1061                                 }
1062                         }
1063                         $r = $t;
1064                 }
1065
1066                 # Redundant interwiki prefix to the local wiki
1067                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1068                         $this->mInterwiki = '';
1069                 }
1070                 # We already know that some pages won't be in the database!
1071                 #
1072                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1073                         $this->mArticleID = 0;
1074                 }
1075                 $f = strstr( $r, '#' );
1076                 if ( false !== $f ) {
1077                         $this->mFragment = substr( $f, 1 );
1078                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1079                         # remove whitespace again: prevents "Foo_bar_#"
1080                         # becoming "Foo_bar_"
1081                         $r = preg_replace( '/_*$/', '', $r );
1082                 }
1083
1084                 # Reject illegal characters.
1085                 #
1086                 if( preg_match( $rxTc, $r ) ) {
1087                         wfProfileOut( $fname );
1088                         return false;
1089                 }
1090
1091                 # "." and ".." conflict with the directories of those namesa
1092                 if ( strpos( $r, '.' ) !== false &&
1093                      ( $r === '.' || $r === '..' ||
1094                        strpos( $r, './' ) === 0  ||
1095                        strpos( $r, '../' ) === 0 ||
1096                        strpos( $r, '/./' ) !== false ||
1097                        strpos( $r, '/../' ) !== false ) )
1098                 {
1099                         wfProfileOut( $fname );
1100                         return false;
1101                 }
1102
1103                 # We shouldn't need to query the DB for the size.
1104                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1105                 if ( strlen( $r ) > 255 ) {
1106                         return false;
1107                 }
1108
1109                 # Initial capital letter
1110                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1111                         $t = $wgContLang->ucfirst( $r );
1112                 } else {
1113                         $t = $r;
1114                 }
1115
1116                 # Fill fields
1117                 $this->mDbkeyform = $t;
1118                 $this->mUrlform = wfUrlencode( $t );
1119
1120                 $this->mTextform = str_replace( '_', ' ', $t );
1121
1122                 wfProfileOut( $fname );
1123                 return true;
1124         }
1125
1126         /**
1127          * Get a Title object associated with the talk page of this article
1128          * @return Title the object for the talk page
1129          * @access public
1130          */
1131         function getTalkPage() {
1132                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1133         }
1134
1135         /**
1136          * Get a title object associated with the subject page of this
1137          * talk page
1138          *
1139          * @return Title the object for the subject page
1140          * @access public
1141          */
1142         function getSubjectPage() {
1143                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1144         }
1145
1146         /**
1147          * Get an array of Title objects linking to this Title
1148          * - Also stores the IDs in the link cache.
1149          *
1150          * @param string $options may be FOR UPDATE
1151          * @return array the Title objects linking here
1152          * @access public
1153          */
1154         function getLinksTo( $options = '' ) {
1155                 global $wgLinkCache;
1156                 $id = $this->getArticleID();
1157
1158                 if ( $options ) {
1159                         $db =& wfGetDB( DB_MASTER );
1160                 } else {
1161                         $db =& wfGetDB( DB_SLAVE );
1162                 }
1163                 $cur = $db->tableName( 'cur' );
1164                 $links = $db->tableName( 'links' );
1165
1166                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1167                 $res = $db->query( $sql, 'Title::getLinksTo' );
1168                 $retVal = array();
1169                 if ( $db->numRows( $res ) ) {
1170                         while ( $row = $db->fetchObject( $res ) ) {
1171                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1172                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1173                                         $retVal[] = $titleObj;
1174                                 }
1175                         }
1176                 }
1177                 $db->freeResult( $res );
1178                 return $retVal;
1179         }
1180
1181         /**
1182          * Get an array of Title objects linking to this non-existent title.
1183          * - Also stores the IDs in the link cache.
1184          *
1185          * @param string $options may be FOR UPDATE
1186          * @return array the Title objects linking here
1187          * @access public
1188          */
1189         function getBrokenLinksTo( $options = '' ) {
1190                 global $wgLinkCache;
1191
1192                 if ( $options ) {
1193                         $db =& wfGetDB( DB_MASTER );
1194                 } else {
1195                         $db =& wfGetDB( DB_SLAVE );
1196                 }
1197                 $cur = $db->tableName( 'cur' );
1198                 $brokenlinks = $db->tableName( 'brokenlinks' );
1199                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1200
1201                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1202                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1203                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1204                 $retVal = array();
1205                 if ( $db->numRows( $res ) ) {
1206                         while ( $row = $db->fetchObject( $res ) ) {
1207                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1208                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1209                                 $retVal[] = $titleObj;
1210                         }
1211                 }
1212                 $db->freeResult( $res );
1213                 return $retVal;
1214         }
1215
1216         /**
1217          * Get a list of URLs to purge from the Squid cache when this
1218          * page changes
1219          *
1220          * @return array the URLs
1221          * @access public
1222          */
1223         function getSquidURLs() {
1224                 return array(
1225                         $this->getInternalURL(),
1226                         $this->getInternalURL( 'action=history' )
1227                 );
1228         }
1229
1230         /**
1231          * Move this page without authentication
1232          * @param Title &$nt the new page Title
1233          * @access public
1234          */
1235         function moveNoAuth( &$nt ) {
1236                 return $this->moveTo( $nt, false );
1237         }
1238
1239         /**
1240          * Move a title to a new location
1241          * @param Title &$nt the new title
1242          * @param bool $auth indicates whether $wgUser's permissions
1243          *      should be checked
1244          * @return mixed true on success, message name on failure
1245          * @access public
1246          */
1247         function moveTo( &$nt, $auth = true ) {
1248                 if( !$this or !$nt ) {
1249                         return 'badtitletext';
1250                 }
1251
1252                 $fname = 'Title::move';
1253                 $oldid = $this->getArticleID();
1254                 $newid = $nt->getArticleID();
1255
1256                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1257                         return 'articleexists';
1258                 }
1259                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1260                          ( '' == $this->getDBkey() ) ||
1261                          ( '' != $this->getInterwiki() ) ||
1262                          ( !$oldid ) ||
1263                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1264                          ( '' == $nt->getDBkey() ) ||
1265                          ( '' != $nt->getInterwiki() ) ) {
1266                         return 'badarticleerror';
1267                 }
1268
1269                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1270                         return 'protectedpage';
1271                 }
1272
1273                 # The move is allowed only if (1) the target doesn't exist, or
1274                 # (2) the target is a redirect to the source, and has no history
1275                 # (so we can undo bad moves right after they're done).
1276
1277                 if ( 0 != $newid ) { # Target exists; check for validity
1278                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1279                                 return 'articleexists';
1280                         }
1281                         $this->moveOverExistingRedirect( $nt );
1282                 } else { # Target didn't exist, do normal move.
1283                         $this->moveToNewTitle( $nt, $newid );
1284                 }
1285
1286                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1287
1288                 $dbw =& wfGetDB( DB_MASTER );
1289                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1290                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1291                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1292                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1293
1294                 # Update watchlists
1295
1296                 $oldnamespace = $this->getNamespace() & ~1;
1297                 $newnamespace = $nt->getNamespace() & ~1;
1298                 $oldtitle = $this->getDBkey();
1299                 $newtitle = $nt->getDBkey();
1300
1301                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1302                         WatchedItem::duplicateEntries( $this, $nt );
1303                 }
1304
1305                 # Update search engine
1306                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1307                 $u->doUpdate();
1308                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1309                 $u->doUpdate();
1310
1311                 return true;
1312         }
1313
1314         /**
1315          * Move page to a title which is at present a redirect to the
1316          * source page
1317          *
1318          * @param Title &$nt the page to move to, which should currently
1319          *      be a redirect
1320          * @access private
1321          */
1322         /* private */ function moveOverExistingRedirect( &$nt ) {
1323                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1324                 $fname = 'Title::moveOverExistingRedirect';
1325                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1326
1327                 $now = wfTimestampNow();
1328                 $won = wfInvertTimestamp( $now );
1329                 $newid = $nt->getArticleID();
1330                 $oldid = $this->getArticleID();
1331                 $dbw =& wfGetDB( DB_MASTER );
1332                 $links = $dbw->tableName( 'links' );
1333
1334                 # Change the name of the target page:
1335                 $dbw->update( 'cur',
1336                         /* SET */ array(
1337                                 'cur_touched' => $dbw->timestamp($now),
1338                                 'cur_namespace' => $nt->getNamespace(),
1339                                 'cur_title' => $nt->getDBkey()
1340                         ),
1341                         /* WHERE */ array( 'cur_id' => $oldid ),
1342                         $fname
1343                 );
1344                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1345
1346                 # Repurpose the old redirect. We don't save it to history since
1347                 # by definition if we've got here it's rather uninteresting.
1348
1349                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1350                 $dbw->update( 'cur',
1351                         /* SET */ array(
1352                                 'cur_touched' => $dbw->timestamp($now),
1353                                 'cur_timestamp' => $dbw->timestamp($now),
1354                                 'inverse_timestamp' => $won,
1355                                 'cur_namespace' => $this->getNamespace(),
1356                                 'cur_title' => $this->getDBkey(),
1357                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1358                                 'cur_comment' => $comment,
1359                                 'cur_user' => $wgUser->getID(),
1360                                 'cur_minor_edit' => 0,
1361                                 'cur_counter' => 0,
1362                                 'cur_restrictions' => '',
1363                                 'cur_user_text' => $wgUser->getName(),
1364                                 'cur_is_redirect' => 1,
1365                                 'cur_is_new' => 1
1366                         ),
1367                         /* WHERE */ array( 'cur_id' => $newid ),
1368                         $fname
1369                 );
1370
1371                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1372
1373                 # Fix the redundant names for the past revisions of the target page.
1374                 # The redirect should have no old revisions.
1375                 $dbw->update(
1376                         /* table */ 'old',
1377                         /* SET */ array(
1378                                 'old_namespace' => $nt->getNamespace(),
1379                                 'old_title' => $nt->getDBkey(),
1380                         ),
1381                         /* WHERE */ array(
1382                                 'old_namespace' => $this->getNamespace(),
1383                                 'old_title' => $this->getDBkey(),
1384                         ),
1385                         $fname
1386                 );
1387
1388                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1389
1390                 # Swap links
1391
1392                 # Load titles and IDs
1393                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1394                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1395
1396                 # Delete them all
1397                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1398                 $dbw->query( $sql, $fname );
1399
1400                 # Reinsert
1401                 if ( count( $linksToOld ) || count( $linksToNew )) {
1402                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1403                         $first = true;
1404
1405                         # Insert links to old title
1406                         foreach ( $linksToOld as $linkTitle ) {
1407                                 if ( $first ) {
1408                                         $first = false;
1409                                 } else {
1410                                         $sql .= ',';
1411                                 }
1412                                 $id = $linkTitle->getArticleID();
1413                                 $sql .= "($id,$newid)";
1414                         }
1415
1416                         # Insert links to new title
1417                         foreach ( $linksToNew as $linkTitle ) {
1418                                 if ( $first ) {
1419                                         $first = false;
1420                                 } else {
1421                                         $sql .= ',';
1422                                 }
1423                                 $id = $linkTitle->getArticleID();
1424                                 $sql .= "($id, $oldid)";
1425                         }
1426
1427                         $dbw->query( $sql, DB_MASTER, $fname );
1428                 }
1429
1430                 # Now, we record the link from the redirect to the new title.
1431                 # It should have no other outgoing links...
1432                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1433                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1434
1435                 # Clear linkscc
1436                 LinkCache::linksccClearLinksTo( $oldid );
1437                 LinkCache::linksccClearLinksTo( $newid );
1438
1439                 # Purge squid
1440                 if ( $wgUseSquid ) {
1441                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1442                         $u = new SquidUpdate( $urls );
1443                         $u->doUpdate();
1444                 }
1445         }
1446
1447         /**
1448          * Move page to non-existing title.
1449          * @param Title &$nt the new Title
1450          * @param int &$newid set to be the new article ID
1451          * @access private
1452          */
1453         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1454                 global $wgUser, $wgLinkCache, $wgUseSquid;
1455                 $fname = 'MovePageForm::moveToNewTitle';
1456                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1457
1458                 $newid = $nt->getArticleID();
1459                 $oldid = $this->getArticleID();
1460                 $dbw =& wfGetDB( DB_MASTER );
1461                 $now = $dbw->timestamp();
1462                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1463                 wfSeedRandom();
1464                 $rand = wfRandom();
1465
1466                 # Rename cur entry
1467                 $dbw->update( 'cur',
1468                         /* SET */ array(
1469                                 'cur_touched' => $now,
1470                                 'cur_namespace' => $nt->getNamespace(),
1471                                 'cur_title' => $nt->getDBkey()
1472                         ),
1473                         /* WHERE */ array( 'cur_id' => $oldid ),
1474                         $fname
1475                 );
1476
1477                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1478
1479                 # Insert redirect
1480                 $dbw->insert( 'cur', array(
1481                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1482                         'cur_namespace' => $this->getNamespace(),
1483                         'cur_title' => $this->getDBkey(),
1484                         'cur_comment' => $comment,
1485                         'cur_user' => $wgUser->getID(),
1486                         'cur_user_text' => $wgUser->getName(),
1487                         'cur_timestamp' => $now,
1488                         'inverse_timestamp' => $won,
1489                         'cur_touched' => $now,
1490                         'cur_is_redirect' => 1,
1491                         'cur_random' => $rand,
1492                         'cur_is_new' => 1,
1493                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1494                 );
1495                 $newid = $dbw->insertId();
1496                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1497
1498                 # Rename old entries
1499                 $dbw->update(
1500                         /* table */ 'old',
1501                         /* SET */ array(
1502                                 'old_namespace' => $nt->getNamespace(),
1503                                 'old_title' => $nt->getDBkey()
1504                         ),
1505                         /* WHERE */ array(
1506                                 'old_namespace' => $this->getNamespace(),
1507                                 'old_title' => $this->getDBkey()
1508                         ), $fname
1509                 );
1510
1511                 # Record in RC
1512                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1513
1514                 # Purge squid and linkscc as per article creation
1515                 Article::onArticleCreate( $nt );
1516
1517                 # Any text links to the old title must be reassigned to the redirect
1518                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1519                 LinkCache::linksccClearLinksTo( $oldid );
1520
1521                 # Record the just-created redirect's linking to the page
1522                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1523
1524                 # Non-existent target may have had broken links to it; these must
1525                 # now be removed and made into good links.
1526                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1527                 $update->fixBrokenLinks();
1528
1529                 # Purge old title from squid
1530                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1531                 $titles = $nt->getLinksTo();
1532                 if ( $wgUseSquid ) {
1533                         $urls = $this->getSquidURLs();
1534                         foreach ( $titles as $linkTitle ) {
1535                                 $urls[] = $linkTitle->getInternalURL();
1536                         }
1537                         $u = new SquidUpdate( $urls );
1538                         $u->doUpdate();
1539                 }
1540         }
1541
1542         /**
1543          * Checks if $this can be moved to a given Title
1544          * - Selects for update, so don't call it unless you mean business
1545          *
1546          * @param Title &$nt the new title to check
1547          * @access public
1548          */
1549         function isValidMoveTarget( $nt ) {
1550                 $fname = 'Title::isValidMoveTarget';
1551                 $dbw =& wfGetDB( DB_MASTER );
1552
1553                 # Is it a redirect?
1554                 $id  = $nt->getArticleID();
1555                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1556                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1557
1558                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1559                         # Not a redirect
1560                         return false;
1561                 }
1562
1563                 # Does the redirect point to the source?
1564                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1565                         $redirTitle = Title::newFromText( $m[1] );
1566                         if( !is_object( $redirTitle ) ||
1567                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1568                                 return false;
1569                         }
1570                 }
1571
1572                 # Does the article have a history?
1573                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1574                         array(
1575                                 'old_namespace' => $nt->getNamespace(),
1576                                 'old_title' => $nt->getDBkey()
1577                         ), $fname, 'FOR UPDATE'
1578                 );
1579
1580                 # Return true if there was no history
1581                 return $row === false;
1582         }
1583
1584         /**
1585          * Create a redirect; fails if the title already exists; does
1586          * not notify RC
1587          *
1588          * @param Title $dest the destination of the redirect
1589          * @param string $comment the comment string describing the move
1590          * @return bool true on success
1591          * @access public
1592          */
1593         function createRedirect( $dest, $comment ) {
1594                 global $wgUser;
1595                 if ( $this->getArticleID() ) {
1596                         return false;
1597                 }
1598
1599                 $fname = 'Title::createRedirect';
1600                 $dbw =& wfGetDB( DB_MASTER );
1601                 $now = wfTimestampNow();
1602                 $won = wfInvertTimestamp( $now );
1603                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1604
1605                 $dbw->insert( 'cur', array(
1606                         'cur_id' => $seqVal,
1607                         'cur_namespace' => $this->getNamespace(),
1608                         'cur_title' => $this->getDBkey(),
1609                         'cur_comment' => $comment,
1610                         'cur_user' => $wgUser->getID(),
1611                         'cur_user_text' => $wgUser->getName(),
1612                         'cur_timestamp' => $now,
1613                         'inverse_timestamp' => $won,
1614                         'cur_touched' => $now,
1615                         'cur_is_redirect' => 1,
1616                         'cur_is_new' => 1,
1617                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1618                 ), $fname );
1619                 $newid = $dbw->insertId();
1620                 $this->resetArticleID( $newid );
1621
1622                 # Link table
1623                 if ( $dest->getArticleID() ) {
1624                         $dbw->insert( 'links',
1625                                 array(
1626                                         'l_to' => $dest->getArticleID(),
1627                                         'l_from' => $newid
1628                                 ), $fname
1629                         );
1630                 } else {
1631                         $dbw->insert( 'brokenlinks',
1632                                 array(
1633                                         'bl_to' => $dest->getPrefixedDBkey(),
1634                                         'bl_from' => $newid
1635                                 ), $fname
1636                         );
1637                 }
1638
1639                 Article::onArticleCreate( $this );
1640                 return true;
1641         }
1642
1643         /**
1644          * Get categories to which this Title belongs and return an array of
1645          * categories' names.
1646          *
1647          * @return array an array of parents in the form:
1648          *      $parent => $currentarticle
1649          * @access public
1650          */
1651         function getParentCategories() {
1652                 global $wgContLang,$wgUser;
1653
1654                 $titlekey = $this->getArticleId();
1655                 $sk =& $wgUser->getSkin();
1656                 $parents = array();
1657                 $dbr =& wfGetDB( DB_SLAVE );
1658                 $cur = $dbr->tableName( 'cur' );
1659                 $categorylinks = $dbr->tableName( 'categorylinks' );
1660
1661                 # NEW SQL
1662                 $sql = "SELECT * FROM categorylinks"
1663                      ." WHERE cl_from='$titlekey'"
1664                          ." AND cl_from <> '0'"
1665                          ." ORDER BY cl_sortkey";
1666
1667                 $res = $dbr->query ( $sql ) ;
1668
1669                 if($dbr->numRows($res) > 0) {
1670                         while ( $x = $dbr->fetchObject ( $res ) )
1671                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1672                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1673                         $dbr->freeResult ( $res ) ;
1674                 } else {
1675                         $data = '';
1676                 }
1677                 return $data;
1678         }
1679
1680         /**
1681          * Go through all parent categories of this Title
1682          * @return array
1683          * @access public
1684          */
1685         function getCategorieBrowser() {
1686                 $parents = $this->getParentCategories();
1687
1688                 if($parents != '') {
1689                         foreach($parents as $parent => $current)
1690                         {
1691                                 $nt = Title::newFromText($parent);
1692                                 $stack[$parent] = $nt->getCategorieBrowser();
1693                         }
1694                         return $stack;
1695                 } else {
1696                         return array();
1697                 }
1698         }
1699
1700
1701         /**
1702          * Get an associative array for selecting this title from
1703          * the "cur" table
1704          *
1705          * @return array
1706          * @access public
1707          */
1708         function curCond() {
1709                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1710         }
1711
1712         /**
1713          * Get an associative array for selecting this title from the
1714          * "old" table
1715          *
1716          * @return array
1717          * @access public
1718          */
1719         function oldCond() {
1720                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1721         }
1722
1723         /**
1724          * Get the revision ID of the previous revision
1725          *
1726          * @param integer $revision  Revision ID. Get the revision that was before this one.
1727          * @return interger $oldrevision|false
1728          */
1729         function getPreviousRevisionID( $revision ) {
1730                 $dbr =& wfGetDB( DB_SLAVE );
1731                 return $dbr->selectField( 'old', 'old_id',
1732                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1733                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1734                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1735         }
1736
1737         /**
1738          * Get the revision ID of the next revision
1739          *
1740          * @param integer $revision  Revision ID. Get the revision that was after this one.
1741          * @return interger $oldrevision|false
1742          */
1743         function getNextRevisionID( $revision ) {
1744                 $dbr =& wfGetDB( DB_SLAVE );
1745                 return $dbr->selectField( 'old', 'old_id',
1746                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1747                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1748                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1749         }
1750
1751 }
1752 ?>