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          * Get a URL with no fragment or server name
 599          * @param string $query an optional query string; if not specified,
 600          *      $wgArticlePath will be used.
 601          * @return string the URL
 602          * @access public
 603          */
 604         function getLocalURL( $query = '' ) {
 605                 global $wgLang, $wgArticlePath, $wgScript;
 606
 607                 if ( $this->isExternal() ) {
 608                         return $this->getFullURL();
 609                 }
 610
 611                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 612                 if ( $query == '' ) {
 613                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 614                 } else {
 615                         if ( $query == '-' ) {
 616                                 $query = '';
 617                         }
 618                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 619                 }
 620                 return $url;
 621         }
 622
 623         /**
 624          * Get an HTML-escaped version of the URL form, suitable for
 625          * using in a link, without a server name or fragment
 626          * @param string $query an optional query string
 627          * @return string the URL
 628          * @access public
 629          */
 630         function escapeLocalURL( $query = '' ) {
 631                 return htmlspecialchars( $this->getLocalURL( $query ) );
 632         }
 633
 634         /**
 635          * Get an HTML-escaped version of the URL form, suitable for
 636          * using in a link, including the server name and fragment
 637          *
 638          * @return string the URL
 639          * @param string $query an optional query string
 640          * @access public
 641          */
 642         function escapeFullURL( $query = '' ) {
 643                 return htmlspecialchars( $this->getFullURL( $query ) );
 644         }
 645
 646         /**
 647          * Get the URL form for an internal link.
 648          * - Used in various Squid-related code, in case we have a different
 649          * internal hostname for the server from the exposed one.
 650          *
 651          * @param string $query an optional query string
 652          * @return string the URL
 653          * @access public
 654          */
 655         function getInternalURL( $query = '' ) {
 656                 global $wgInternalServer;
 657                 return $wgInternalServer . $this->getLocalURL( $query );
 658         }
 659
 660         /**
 661          * Get the edit URL for this Title
 662          * @return string the URL, or a null string if this is an
 663          *      interwiki link
 664          * @access public
 665          */
 666         function getEditURL() {
 667                 global $wgServer, $wgScript;
 668
 669                 if ( '' != $this->mInterwiki ) { return ''; }
 670                 $s = $this->getLocalURL( 'action=edit' );
 671
 672                 return $s;
 673         }
 674
 675         /**
 676          * Get the HTML-escaped displayable text form.
 677          * Used for the title field in <a> tags.
 678          * @return string the text, including any prefixes
 679          * @access public
 680          */
 681         function getEscapedText() {
 682                 return htmlspecialchars( $this->getPrefixedText() );
 683         }
 684
 685         /**
 686          * Is this Title interwiki?
 687          * @return boolean
 688          * @access public
 689          */
 690         function isExternal() { return ( '' != $this->mInterwiki ); }
 691
 692         /**
 693          * Does the title correspond to a protected article?
 694          * @return boolean
 695          * @access public
 696          */
 697         function isProtected() {
 698                 if ( -1 == $this->mNamespace ) { return true; }
 699                 $a = $this->getRestrictions();
 700                 if ( in_array( 'sysop', $a ) ) { return true; }
 701                 return false;
 702         }
 703
 704         /**
 705          * Is the page a log page, i.e. one where the history is messed up by
 706          * LogPage.php? This used to be used for suppressing diff links in
 707          * recent changes, but now that's done by setting a flag in the
 708          * recentchanges table. Hence, this probably is no longer used.
 709          *
 710          * @deprecated
 711          * @access public
 712          */
 713         function isLog() {
 714                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 715                         return false;
 716                 }
 717                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 718                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 719                         return true;
 720                 }
 721                 return false;
 722         }
 723
 724         /**
 725          * Is $wgUser is watching this page?
 726          * @return boolean
 727          * @access public
 728          */
 729         function userIsWatching() {
 730                 global $wgUser;
 731
 732                 if ( -1 == $this->mNamespace ) { return false; }
 733                 if ( 0 == $wgUser->getID() ) { return false; }
 734
 735                 return $wgUser->isWatched( $this );
 736         }
 737
 738         /**
 739          * Can $wgUser edit this page?
 740          * @return boolean
 741          * @access public
 742          */
 743         function userCanEdit() {
 744                 global $wgUser;
 745                 if( NS_SPECIAL == $this->mNamespace ) {
 746                         return false;
 747                 }
 748                 if( NS_MEDIAWIKI == $this->mNamespace &&
 749                     !$wgUser->isAllowed('editinterface') ) {
 750                         return false;
 751                 }
 752                 if( $this->mDbkeyform == '_' ) {
 753                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 754                         return false;
 755                 }
 756
 757                 # protect global styles and js
 758                 if ( NS_MEDIAWIKI == $this->mNamespace
 759                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 760                      && !$wgUser->isAllowed('editinterface') ) {
 761                         return false;
 762                 }
 763
 764                 # protect css/js subpages of user pages
 765                 # XXX: this might be better using restrictions
 766                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 767                 if( NS_USER == $this->mNamespace
 768                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 769                         && !$wgUser->isAllowed('editinterface')
 770                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 771                         return false;
 772                 }
 773
 774                 foreach( $this->getRestrictions() as $right ) {
 775                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 776                                 return false;
 777                         }
 778                 }
 779                 return true;
 780         }
 781
 782         /**
 783          * Can $wgUser read this page?
 784          * @return boolean
 785          * @access public
 786          */
 787         function userCanRead() {
 788                 global $wgUser;
 789
 790                 if( $wgUser->isAllowed('read') ) {
 791                         return true;
 792                 } else {
 793                         global $wgWhitelistRead;
 794
 795                         /** If anon users can create an account,
 796                             they need to reach the login page first! */
 797                         if( $wgUser->isAllowed( 'createaccount' )
 798                             && $this->mId == NS_SPECIAL
 799                             && $this->getText() == 'Userlogin' ) {
 800                                 return true;
 801                         }
 802
 803                         /** some pages are explicitly allowed */
 804                         $name = $this->getPrefixedText();
 805                         if( in_array( $name, $wgWhitelistRead ) ) {
 806                                 return true;
 807                         }
 808
 809                         # Compatibility with old settings
 810                         if( $this->getNamespace() == NS_MAIN ) {
 811                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 812                                         return true;
 813                                 }
 814                         }
 815                 }
 816                 return false;
 817         }
 818
 819         /**
 820          * Is this a .css or .js subpage of a user page?
 821          * @return bool
 822          * @access public
 823          */
 824         function isCssJsSubpage() {
 825                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 826         }
 827         /**
 828          * Is this a .css subpage of a user page?
 829          * @return bool
 830          * @access public
 831          */
 832         function isCssSubpage() {
 833                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 834         }
 835         /**
 836          * Is this a .js subpage of a user page?
 837          * @return bool
 838          * @access public
 839          */
 840         function isJsSubpage() {
 841                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 842         }
 843         /**
 844          * Protect css/js subpages of user pages: can $wgUser edit
 845          * this page?
 846          *
 847          * @return boolean
 848          * @todo XXX: this might be better using restrictions
 849          * @access public
 850          */
 851         function userCanEditCssJsSubpage() {
 852                 global $wgUser;
 853                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 854         }
 855
 856         /**
 857          * Accessor/initialisation for mRestrictions
 858          * @return array the array of groups allowed to edit this article
 859          * @access public
 860          */
 861         function getRestrictions() {
 862                 $id = $this->getArticleID();
 863                 if ( 0 == $id ) { return array(); }
 864
 865                 if ( ! $this->mRestrictionsLoaded ) {
 866                         $dbr =& wfGetDB( DB_SLAVE );
 867                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 868                         $this->mRestrictions = explode( ',', trim( $res ) );
 869                         $this->mRestrictionsLoaded = true;
 870                 }
 871                 return $this->mRestrictions;
 872         }
 873
 874         /**
 875          * Is there a version of this page in the deletion archive?
 876          * @return int the number of archived revisions
 877          * @access public
 878          */
 879         function isDeleted() {
 880                 $fname = 'Title::isDeleted';
 881                 $dbr =& wfGetDB( DB_SLAVE );
 882                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 883                         'ar_title' => $this->getDBkey() ), $fname );
 884                 return (int)$n;
 885         }
 886
 887         /**
 888          * Get the article ID for this Title from the link cache,
 889          * adding it if necessary
 890          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 891          *      for update
 892          * @return int the ID
 893          * @access public
 894          */
 895         function getArticleID( $flags = 0 ) {
 896                 global $wgLinkCache;
 897
 898                 if ( $flags & GAID_FOR_UPDATE ) {
 899                         $oldUpdate = $wgLinkCache->forUpdate( true );
 900                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 901                         $wgLinkCache->forUpdate( $oldUpdate );
 902                 } else {
 903                         if ( -1 == $this->mArticleID ) {
 904                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 905                         }
 906                 }
 907                 return $this->mArticleID;
 908         }
 909
 910         /**
 911          * This clears some fields in this object, and clears any associated
 912          * keys in the "bad links" section of $wgLinkCache.
 913          *
 914          * - This is called from Article::insertNewArticle() to allow
 915          * loading of the new cur_id. It's also called from
 916          * Article::doDeleteArticle()
 917          *
 918          * @param int $newid the new Article ID
 919          * @access public
 920          */
 921         function resetArticleID( $newid ) {
 922                 global $wgLinkCache;
 923                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 924
 925                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 926                 else { $this->mArticleID = $newid; }
 927                 $this->mRestrictionsLoaded = false;
 928                 $this->mRestrictions = array();
 929         }
 930
 931         /**
 932          * Updates cur_touched for this page; called from LinksUpdate.php
 933          * @return bool true if the update succeded
 934          * @access public
 935          */
 936         function invalidateCache() {
 937                 $now = wfTimestampNow();
 938                 $dbw =& wfGetDB( DB_MASTER );
 939                 $success = $dbw->update( 'cur',
 940                         array( /* SET */
 941                                 'cur_touched' => $dbw->timestamp()
 942                         ), array( /* WHERE */
 943                                 'cur_namespace' => $this->getNamespace() ,
 944                                 'cur_title' => $this->getDBkey()
 945                         ), 'Title::invalidateCache'
 946                 );
 947                 return $success;
 948         }
 949
 950         /**
 951          * Prefix some arbitrary text with the namespace or interwiki prefix
 952          * of this object
 953          *
 954          * @param string $name the text
 955          * @return string the prefixed text
 956          * @access private
 957          */
 958         /* private */ function prefix( $name ) {
 959                 global $wgContLang;
 960
 961                 $p = '';
 962                 if ( '' != $this->mInterwiki ) {
 963                         $p = $this->mInterwiki . ':';
 964                 }
 965                 if ( 0 != $this->mNamespace ) {
 966                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 967                 }
 968                 return $p . $name;
 969         }
 970
 971         /**
 972          * Secure and split - main initialisation function for this object
 973          *
 974          * Assumes that mDbkeyform has been set, and is urldecoded
 975          * and uses underscores, but not otherwise munged.  This function
 976          * removes illegal characters, splits off the interwiki and
 977          * namespace prefixes, sets the other forms, and canonicalizes
 978          * everything.
 979          * @return bool true on success
 980          * @access private
 981          */
 982         /* private */ function secureAndSplit()
 983         {
 984                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 985                 $fname = 'Title::secureAndSplit';
 986                 wfProfileIn( $fname );
 987
 988                 static $imgpre = false;
 989                 static $rxTc = false;
 990
 991                 # Initialisation
 992                 if ( $imgpre === false ) {
 993                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
 994                         # % is needed as well
 995                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/';
 996                 }
 997
 998                 $this->mInterwiki = $this->mFragment = '';
 999                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1000
1001                 # Clean up whitespace
1002                 #
1003                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
1004                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
1005
1006                 if ( '' == $t ) {
1007                         wfProfileOut( $fname );
1008                         return false;
1009                 }
1010
1011                 global $wgUseLatin1;
1012                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1013                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1014                         wfProfileOut( $fname );
1015                         return false;
1016                 }
1017
1018                 $this->mDbkeyform = $t;
1019                 $done = false;
1020
1021                 # :Image: namespace
1022                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1023                         $t = substr( $t, 1 );
1024                 }
1025
1026                 # Initial colon indicating main namespace
1027                 if ( ':' == $t{0} ) {
1028                         $r = substr( $t, 1 );
1029                         $this->mNamespace = NS_MAIN;
1030                 } else {
1031                         # Namespace or interwiki prefix
1032                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1033                                 #$p = strtolower( $m[1] );
1034                                 $p = $m[1];
1035                                 $lowerNs = strtolower( $p );
1036                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1037                                         # Canonical namespace
1038                                         $t = $m[2];
1039                                         $this->mNamespace = $ns;
1040                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1041                                         # Ordinary namespace
1042                                         $t = $m[2];
1043                                         $this->mNamespace = $ns;
1044                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1045                                         # Interwiki link
1046                                         $t = $m[2];
1047                                         $this->mInterwiki = $p;
1048
1049                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1050                                                 $done = true;
1051                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1052                                                 $done = true;
1053                                         }
1054                                 }
1055                         }
1056                         $r = $t;
1057                 }
1058
1059                 # Redundant interwiki prefix to the local wiki
1060                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1061                         $this->mInterwiki = '';
1062                 }
1063                 # We already know that some pages won't be in the database!
1064                 #
1065                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1066                         $this->mArticleID = 0;
1067                 }
1068                 $f = strstr( $r, '#' );
1069                 if ( false !== $f ) {
1070                         $this->mFragment = substr( $f, 1 );
1071                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1072                         # remove whitespace again: prevents "Foo_bar_#"
1073                         # becoming "Foo_bar_"
1074                         $r = preg_replace( '/_*$/', '', $r );
1075                 }
1076
1077                 # Reject illegal characters.
1078                 #
1079                 if( preg_match( $rxTc, $r ) ) {
1080                         wfProfileOut( $fname );
1081                         return false;
1082                 }
1083
1084                 # "." and ".." conflict with the directories of those namesa
1085                 if ( strpos( $r, '.' ) !== false &&
1086                      ( $r === '.' || $r === '..' ||
1087                        strpos( $r, './' ) === 0  ||
1088                        strpos( $r, '../' ) === 0 ||
1089                        strpos( $r, '/./' ) !== false ||
1090                        strpos( $r, '/../' ) !== false ) )
1091                 {
1092                         wfProfileOut( $fname );
1093                         return false;
1094                 }
1095
1096                 # We shouldn't need to query the DB for the size.
1097                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1098                 if ( strlen( $r ) > 255 ) {
1099                         return false;
1100                 }
1101
1102                 # Initial capital letter
1103                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1104                         $t = $wgContLang->ucfirst( $r );
1105                 } else {
1106                         $t = $r;
1107                 }
1108
1109                 # Fill fields
1110                 $this->mDbkeyform = $t;
1111                 $this->mUrlform = wfUrlencode( $t );
1112
1113                 $this->mTextform = str_replace( '_', ' ', $t );
1114
1115                 wfProfileOut( $fname );
1116                 return true;
1117         }
1118
1119         /**
1120          * Get a Title object associated with the talk page of this article
1121          * @return Title the object for the talk page
1122          * @access public
1123          */
1124         function getTalkPage() {
1125                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1126         }
1127
1128         /**
1129          * Get a title object associated with the subject page of this
1130          * talk page
1131          *
1132          * @return Title the object for the subject page
1133          * @access public
1134          */
1135         function getSubjectPage() {
1136                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1137         }
1138
1139         /**
1140          * Get an array of Title objects linking to this Title
1141          * - Also stores the IDs in the link cache.
1142          *
1143          * @param string $options may be FOR UPDATE
1144          * @return array the Title objects linking here
1145          * @access public
1146          */
1147         function getLinksTo( $options = '' ) {
1148                 global $wgLinkCache;
1149                 $id = $this->getArticleID();
1150
1151                 if ( $options ) {
1152                         $db =& wfGetDB( DB_MASTER );
1153                 } else {
1154                         $db =& wfGetDB( DB_SLAVE );
1155                 }
1156                 $cur = $db->tableName( 'cur' );
1157                 $links = $db->tableName( 'links' );
1158
1159                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1160                 $res = $db->query( $sql, 'Title::getLinksTo' );
1161                 $retVal = array();
1162                 if ( $db->numRows( $res ) ) {
1163                         while ( $row = $db->fetchObject( $res ) ) {
1164                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1165                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1166                                         $retVal[] = $titleObj;
1167                                 }
1168                         }
1169                 }
1170                 $db->freeResult( $res );
1171                 return $retVal;
1172         }
1173
1174         /**
1175          * Get an array of Title objects linking to this non-existent title.
1176          * - Also stores the IDs in the link cache.
1177          *
1178          * @param string $options may be FOR UPDATE
1179          * @return array the Title objects linking here
1180          * @access public
1181          */
1182         function getBrokenLinksTo( $options = '' ) {
1183                 global $wgLinkCache;
1184
1185                 if ( $options ) {
1186                         $db =& wfGetDB( DB_MASTER );
1187                 } else {
1188                         $db =& wfGetDB( DB_SLAVE );
1189                 }
1190                 $cur = $db->tableName( 'cur' );
1191                 $brokenlinks = $db->tableName( 'brokenlinks' );
1192                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1193
1194                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1195                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1196                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1197                 $retVal = array();
1198                 if ( $db->numRows( $res ) ) {
1199                         while ( $row = $db->fetchObject( $res ) ) {
1200                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1201                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1202                                 $retVal[] = $titleObj;
1203                         }
1204                 }
1205                 $db->freeResult( $res );
1206                 return $retVal;
1207         }
1208
1209         /**
1210          * Get a list of URLs to purge from the Squid cache when this
1211          * page changes
1212          *
1213          * @return array the URLs
1214          * @access public
1215          */
1216         function getSquidURLs() {
1217                 return array(
1218                         $this->getInternalURL(),
1219                         $this->getInternalURL( 'action=history' )
1220                 );
1221         }
1222
1223         /**
1224          * Move this page without authentication
1225          * @param Title &$nt the new page Title
1226          * @access public
1227          */
1228         function moveNoAuth( &$nt ) {
1229                 return $this->moveTo( $nt, false );
1230         }
1231
1232         /**
1233          * Move a title to a new location
1234          * @param Title &$nt the new title
1235          * @param bool $auth indicates whether $wgUser's permissions
1236          *      should be checked
1237          * @return mixed true on success, message name on failure
1238          * @access public
1239          */
1240         function moveTo( &$nt, $auth = true ) {
1241                 if( !$this or !$nt ) {
1242                         return 'badtitletext';
1243                 }
1244
1245                 $fname = 'Title::move';
1246                 $oldid = $this->getArticleID();
1247                 $newid = $nt->getArticleID();
1248
1249                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1250                         return 'articleexists';
1251                 }
1252                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1253                          ( '' == $this->getDBkey() ) ||
1254                          ( '' != $this->getInterwiki() ) ||
1255                          ( !$oldid ) ||
1256                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1257                          ( '' == $nt->getDBkey() ) ||
1258                          ( '' != $nt->getInterwiki() ) ) {
1259                         return 'badarticleerror';
1260                 }
1261
1262                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1263                         return 'protectedpage';
1264                 }
1265
1266                 # The move is allowed only if (1) the target doesn't exist, or
1267                 # (2) the target is a redirect to the source, and has no history
1268                 # (so we can undo bad moves right after they're done).
1269
1270                 if ( 0 != $newid ) { # Target exists; check for validity
1271                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1272                                 return 'articleexists';
1273                         }
1274                         $this->moveOverExistingRedirect( $nt );
1275                 } else { # Target didn't exist, do normal move.
1276                         $this->moveToNewTitle( $nt, $newid );
1277                 }
1278
1279                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1280
1281                 $dbw =& wfGetDB( DB_MASTER );
1282                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1283                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1284                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1285                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1286
1287                 # Update watchlists
1288
1289                 $oldnamespace = $this->getNamespace() & ~1;
1290                 $newnamespace = $nt->getNamespace() & ~1;
1291                 $oldtitle = $this->getDBkey();
1292                 $newtitle = $nt->getDBkey();
1293
1294                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1295                         WatchedItem::duplicateEntries( $this, $nt );
1296                 }
1297
1298                 # Update search engine
1299                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1300                 $u->doUpdate();
1301                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1302                 $u->doUpdate();
1303
1304                 return true;
1305         }
1306
1307         /**
1308          * Move page to a title which is at present a redirect to the
1309          * source page
1310          *
1311          * @param Title &$nt the page to move to, which should currently
1312          *      be a redirect
1313          * @access private
1314          */
1315         /* private */ function moveOverExistingRedirect( &$nt ) {
1316                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1317                 $fname = 'Title::moveOverExistingRedirect';
1318                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1319
1320                 $now = wfTimestampNow();
1321                 $won = wfInvertTimestamp( $now );
1322                 $newid = $nt->getArticleID();
1323                 $oldid = $this->getArticleID();
1324                 $dbw =& wfGetDB( DB_MASTER );
1325                 $links = $dbw->tableName( 'links' );
1326
1327                 # Change the name of the target page:
1328                 $dbw->update( 'cur',
1329                         /* SET */ array(
1330                                 'cur_touched' => $dbw->timestamp($now),
1331                                 'cur_namespace' => $nt->getNamespace(),
1332                                 'cur_title' => $nt->getDBkey()
1333                         ),
1334                         /* WHERE */ array( 'cur_id' => $oldid ),
1335                         $fname
1336                 );
1337                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1338
1339                 # Repurpose the old redirect. We don't save it to history since
1340                 # by definition if we've got here it's rather uninteresting.
1341
1342                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1343                 $dbw->update( 'cur',
1344                         /* SET */ array(
1345                                 'cur_touched' => $dbw->timestamp($now),
1346                                 'cur_timestamp' => $dbw->timestamp($now),
1347                                 'inverse_timestamp' => $won,
1348                                 'cur_namespace' => $this->getNamespace(),
1349                                 'cur_title' => $this->getDBkey(),
1350                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1351                                 'cur_comment' => $comment,
1352                                 'cur_user' => $wgUser->getID(),
1353                                 'cur_minor_edit' => 0,
1354                                 'cur_counter' => 0,
1355                                 'cur_restrictions' => '',
1356                                 'cur_user_text' => $wgUser->getName(),
1357                                 'cur_is_redirect' => 1,
1358                                 'cur_is_new' => 1
1359                         ),
1360                         /* WHERE */ array( 'cur_id' => $newid ),
1361                         $fname
1362                 );
1363
1364                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1365
1366                 # Fix the redundant names for the past revisions of the target page.
1367                 # The redirect should have no old revisions.
1368                 $dbw->update(
1369                         /* table */ 'old',
1370                         /* SET */ array(
1371                                 'old_namespace' => $nt->getNamespace(),
1372                                 'old_title' => $nt->getDBkey(),
1373                         ),
1374                         /* WHERE */ array(
1375                                 'old_namespace' => $this->getNamespace(),
1376                                 'old_title' => $this->getDBkey(),
1377                         ),
1378                         $fname
1379                 );
1380
1381                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1382
1383                 # Swap links
1384
1385                 # Load titles and IDs
1386                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1387                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1388
1389                 # Delete them all
1390                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1391                 $dbw->query( $sql, $fname );
1392
1393                 # Reinsert
1394                 if ( count( $linksToOld ) || count( $linksToNew )) {
1395                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1396                         $first = true;
1397
1398                         # Insert links to old title
1399                         foreach ( $linksToOld as $linkTitle ) {
1400                                 if ( $first ) {
1401                                         $first = false;
1402                                 } else {
1403                                         $sql .= ',';
1404                                 }
1405                                 $id = $linkTitle->getArticleID();
1406                                 $sql .= "($id,$newid)";
1407                         }
1408
1409                         # Insert links to new title
1410                         foreach ( $linksToNew as $linkTitle ) {
1411                                 if ( $first ) {
1412                                         $first = false;
1413                                 } else {
1414                                         $sql .= ',';
1415                                 }
1416                                 $id = $linkTitle->getArticleID();
1417                                 $sql .= "($id, $oldid)";
1418                         }
1419
1420                         $dbw->query( $sql, DB_MASTER, $fname );
1421                 }
1422
1423                 # Now, we record the link from the redirect to the new title.
1424                 # It should have no other outgoing links...
1425                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1426                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1427
1428                 # Clear linkscc
1429                 LinkCache::linksccClearLinksTo( $oldid );
1430                 LinkCache::linksccClearLinksTo( $newid );
1431
1432                 # Purge squid
1433                 if ( $wgUseSquid ) {
1434                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1435                         $u = new SquidUpdate( $urls );
1436                         $u->doUpdate();
1437                 }
1438         }
1439
1440         /**
1441          * Move page to non-existing title.
1442          * @param Title &$nt the new Title
1443          * @param int &$newid set to be the new article ID
1444          * @access private
1445          */
1446         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1447                 global $wgUser, $wgLinkCache, $wgUseSquid;
1448                 $fname = 'MovePageForm::moveToNewTitle';
1449                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1450
1451                 $newid = $nt->getArticleID();
1452                 $oldid = $this->getArticleID();
1453                 $dbw =& wfGetDB( DB_MASTER );
1454                 $now = $dbw->timestamp();
1455                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1456                 wfSeedRandom();
1457                 $rand = wfRandom();
1458
1459                 # Rename cur entry
1460                 $dbw->update( 'cur',
1461                         /* SET */ array(
1462                                 'cur_touched' => $now,
1463                                 'cur_namespace' => $nt->getNamespace(),
1464                                 'cur_title' => $nt->getDBkey()
1465                         ),
1466                         /* WHERE */ array( 'cur_id' => $oldid ),
1467                         $fname
1468                 );
1469
1470                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1471
1472                 # Insert redirect
1473                 $dbw->insert( 'cur', array(
1474                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1475                         'cur_namespace' => $this->getNamespace(),
1476                         'cur_title' => $this->getDBkey(),
1477                         'cur_comment' => $comment,
1478                         'cur_user' => $wgUser->getID(),
1479                         'cur_user_text' => $wgUser->getName(),
1480                         'cur_timestamp' => $now,
1481                         'inverse_timestamp' => $won,
1482                         'cur_touched' => $now,
1483                         'cur_is_redirect' => 1,
1484                         'cur_random' => $rand,
1485                         'cur_is_new' => 1,
1486                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1487                 );
1488                 $newid = $dbw->insertId();
1489                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1490
1491                 # Rename old entries
1492                 $dbw->update(
1493                         /* table */ 'old',
1494                         /* SET */ array(
1495                                 'old_namespace' => $nt->getNamespace(),
1496                                 'old_title' => $nt->getDBkey()
1497                         ),
1498                         /* WHERE */ array(
1499                                 'old_namespace' => $this->getNamespace(),
1500                                 'old_title' => $this->getDBkey()
1501                         ), $fname
1502                 );
1503
1504                 # Record in RC
1505                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1506
1507                 # Purge squid and linkscc as per article creation
1508                 Article::onArticleCreate( $nt );
1509
1510                 # Any text links to the old title must be reassigned to the redirect
1511                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1512                 LinkCache::linksccClearLinksTo( $oldid );
1513
1514                 # Record the just-created redirect's linking to the page
1515                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1516
1517                 # Non-existent target may have had broken links to it; these must
1518                 # now be removed and made into good links.
1519                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1520                 $update->fixBrokenLinks();
1521
1522                 # Purge old title from squid
1523                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1524                 $titles = $nt->getLinksTo();
1525                 if ( $wgUseSquid ) {
1526                         $urls = $this->getSquidURLs();
1527                         foreach ( $titles as $linkTitle ) {
1528                                 $urls[] = $linkTitle->getInternalURL();
1529                         }
1530                         $u = new SquidUpdate( $urls );
1531                         $u->doUpdate();
1532                 }
1533         }
1534
1535         /**
1536          * Checks if $this can be moved to a given Title
1537          * - Selects for update, so don't call it unless you mean business
1538          *
1539          * @param Title &$nt the new title to check
1540          * @access public
1541          */
1542         function isValidMoveTarget( $nt ) {
1543                 $fname = 'Title::isValidMoveTarget';
1544                 $dbw =& wfGetDB( DB_MASTER );
1545
1546                 # Is it a redirect?
1547                 $id  = $nt->getArticleID();
1548                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1549                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1550
1551                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1552                         # Not a redirect
1553                         return false;
1554                 }
1555
1556                 # Does the redirect point to the source?
1557                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1558                         $redirTitle = Title::newFromText( $m[1] );
1559                         if( !is_object( $redirTitle ) ||
1560                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1561                                 return false;
1562                         }
1563                 }
1564
1565                 # Does the article have a history?
1566                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1567                         array(
1568                                 'old_namespace' => $nt->getNamespace(),
1569                                 'old_title' => $nt->getDBkey()
1570                         ), $fname, 'FOR UPDATE'
1571                 );
1572
1573                 # Return true if there was no history
1574                 return $row === false;
1575         }
1576
1577         /**
1578          * Create a redirect; fails if the title already exists; does
1579          * not notify RC
1580          *
1581          * @param Title $dest the destination of the redirect
1582          * @param string $comment the comment string describing the move
1583          * @return bool true on success
1584          * @access public
1585          */
1586         function createRedirect( $dest, $comment ) {
1587                 global $wgUser;
1588                 if ( $this->getArticleID() ) {
1589                         return false;
1590                 }
1591
1592                 $fname = 'Title::createRedirect';
1593                 $dbw =& wfGetDB( DB_MASTER );
1594                 $now = wfTimestampNow();
1595                 $won = wfInvertTimestamp( $now );
1596                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1597
1598                 $dbw->insert( 'cur', array(
1599                         'cur_id' => $seqVal,
1600                         'cur_namespace' => $this->getNamespace(),
1601                         'cur_title' => $this->getDBkey(),
1602                         'cur_comment' => $comment,
1603                         'cur_user' => $wgUser->getID(),
1604                         'cur_user_text' => $wgUser->getName(),
1605                         'cur_timestamp' => $now,
1606                         'inverse_timestamp' => $won,
1607                         'cur_touched' => $now,
1608                         'cur_is_redirect' => 1,
1609                         'cur_is_new' => 1,
1610                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1611                 ), $fname );
1612                 $newid = $dbw->insertId();
1613                 $this->resetArticleID( $newid );
1614
1615                 # Link table
1616                 if ( $dest->getArticleID() ) {
1617                         $dbw->insert( 'links',
1618                                 array(
1619                                         'l_to' => $dest->getArticleID(),
1620                                         'l_from' => $newid
1621                                 ), $fname
1622                         );
1623                 } else {
1624                         $dbw->insert( 'brokenlinks',
1625                                 array(
1626                                         'bl_to' => $dest->getPrefixedDBkey(),
1627                                         'bl_from' => $newid
1628                                 ), $fname
1629                         );
1630                 }
1631
1632                 Article::onArticleCreate( $this );
1633                 return true;
1634         }
1635
1636         /**
1637          * Get categories to which this Title belongs and return an array of
1638          * categories' names.
1639          *
1640          * @return array an array of parents in the form:
1641          *      $parent => $currentarticle
1642          * @access public
1643          */
1644         function getParentCategories() {
1645                 global $wgContLang,$wgUser;
1646
1647                 $titlekey = $this->getArticleId();
1648                 $sk =& $wgUser->getSkin();
1649                 $parents = array();
1650                 $dbr =& wfGetDB( DB_SLAVE );
1651                 $cur = $dbr->tableName( 'cur' );
1652                 $categorylinks = $dbr->tableName( 'categorylinks' );
1653
1654                 # NEW SQL
1655                 $sql = "SELECT * FROM categorylinks"
1656                      ." WHERE cl_from='$titlekey'"
1657                          ." AND cl_from <> '0'"
1658                          ." ORDER BY cl_sortkey";
1659
1660                 $res = $dbr->query ( $sql ) ;
1661
1662                 if($dbr->numRows($res) > 0) {
1663                         while ( $x = $dbr->fetchObject ( $res ) )
1664                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1665                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1666                         $dbr->freeResult ( $res ) ;
1667                 } else {
1668                         $data = '';
1669                 }
1670                 return $data;
1671         }
1672
1673         /**
1674          * Go through all parent categories of this Title
1675          * @return array
1676          * @access public
1677          */
1678         function getCategorieBrowser() {
1679                 $parents = $this->getParentCategories();
1680
1681                 if($parents != '') {
1682                         foreach($parents as $parent => $current)
1683                         {
1684                                 $nt = Title::newFromText($parent);
1685                                 $stack[$parent] = $nt->getCategorieBrowser();
1686                         }
1687                         return $stack;
1688                 } else {
1689                         return array();
1690                 }
1691         }
1692
1693
1694         /**
1695          * Get an associative array for selecting this title from
1696          * the "cur" table
1697          *
1698          * @return array
1699          * @access public
1700          */
1701         function curCond() {
1702                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1703         }
1704
1705         /**
1706          * Get an associative array for selecting this title from the
1707          * "old" table
1708          *
1709          * @return array
1710          * @access public
1711          */
1712         function oldCond() {
1713                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1714         }
1715
1716         /**
1717          * Get the revision ID of the previous revision
1718          *
1719          * @param integer $revision  Revision ID. Get the revision that was before this one.
1720          * @return interger $oldrevision|false
1721          */
1722         function getPreviousRevisionID( $revision ) {
1723                 $dbr =& wfGetDB( DB_SLAVE );
1724                 return $dbr->selectField( 'old', 'old_id',
1725                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1726                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1727                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1728         }
1729
1730         /**
1731          * Get the revision ID of the next revision
1732          *
1733          * @param integer $revision  Revision ID. Get the revision that was after this one.
1734          * @return interger $oldrevision|false
1735          */
1736         function getNextRevisionID( $revision ) {
1737                 $dbr =& wfGetDB( DB_SLAVE );
1738                 return $dbr->selectField( 'old', 'old_id',
1739                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1740                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1741                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1742         }
1743
1744 }
1745 ?>