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          * Get the interwiki prefix (or null string)
 471          * @return string
 472          * @access public
 473          */
 474         function getInterwiki() { return $this->mInterwiki; }
 475         /**
 476          * Get the Title fragment (i.e. the bit after the #)
 477          * @return string
 478          * @access public
 479          */
 480         function getFragment() { return $this->mFragment; }
 481         /**
 482          * Get the default namespace index, for when there is no namespace
 483          * @return int
 484          * @access public
 485          */
 486         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 487
 488         /**
 489          * Get title for search index
 490          * @return string a stripped-down title string ready for the
 491          *      search index
 492          */
 493         function getIndexTitle() {
 494                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 495         }
 496
 497         /**
 498          * Get the prefixed database key form
 499          * @return string the prefixed title, with underscores and
 500          *      any interwiki and namespace prefixes
 501          * @access public
 502          */
 503         function getPrefixedDBkey() {
 504                 $s = $this->prefix( $this->mDbkeyform );
 505                 $s = str_replace( ' ', '_', $s );
 506                 return $s;
 507         }
 508
 509         /**
 510          * Get the prefixed title with spaces.
 511          * This is the form usually used for display
 512          * @return string the prefixed title, with spaces
 513          * @access public
 514          */
 515         function getPrefixedText() {
 516                 global $wgContLang;
 517                 if ( empty( $this->mPrefixedText ) ) {
 518                         $s = $this->prefix( $this->mTextform );
 519                         $s = str_replace( '_', ' ', $s );
 520                         $this->mPrefixedText = $s;
 521                 }
 522                 return $this->mPrefixedText;
 523         }
 524
 525         /**
 526          * Get the prefixed title with spaces, plus any fragment
 527          * (part beginning with '#')
 528          * @return string the prefixed title, with spaces and
 529          *      the fragment, including '#'
 530          * @access public
 531          */
 532         function getFullText() {
 533                 global $wgContLang;
 534                 $text = $this->getPrefixedText();
 535                 if( '' != $this->mFragment ) {
 536                         $text .= '#' . $this->mFragment;
 537                 }
 538                 return $text;
 539         }
 540
 541         /**
 542          * Get a URL-encoded title (not an actual URL) including interwiki
 543          * @return string the URL-encoded form
 544          * @access public
 545          */
 546         function getPrefixedURL() {
 547                 $s = $this->prefix( $this->mDbkeyform );
 548                 $s = str_replace( ' ', '_', $s );
 549
 550                 $s = wfUrlencode ( $s ) ;
 551
 552                 # Cleaning up URL to make it look nice -- is this safe?
 553                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 554                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 555                 $s = str_replace( '%28', '(', $s );
 556                 $s = str_replace( '%29', ')', $s );
 557
 558                 return $s;
 559         }
 560
 561         /**
 562          * Get a real URL referring to this title, with interwiki link and
 563          * fragment
 564          *
 565          * @param string $query an optional query string, not used
 566          *      for interwiki links
 567          * @return string the URL
 568          * @access public
 569          */
 570         function getFullURL( $query = '' ) {
 571                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 572
 573                 if ( '' == $this->mInterwiki ) {
 574                         $p = $wgArticlePath;
 575                         return $wgServer . $this->getLocalUrl( $query );
 576                 } else {
 577                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 578                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 579                         if ( '' != $namespace ) {
 580                                 # Can this actually happen? Interwikis shouldn't be parsed.
 581                                 $namepace .= ':';
 582                         }
 583                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 584                         if ( '' != $this->mFragment ) {
 585                                 $url .= '#' . $this->mFragment;
 586                         }
 587                         return $url;
 588                 }
 589         }
 590
 591         /**
 592          * Get a URL with no fragment or server name
 593          * @param string $query an optional query string; if not specified,
 594          *      $wgArticlePath will be used.
 595          * @return string the URL
 596          * @access public
 597          */
 598         function getLocalURL( $query = '' ) {
 599                 global $wgLang, $wgArticlePath, $wgScript;
 600
 601                 if ( $this->isExternal() ) {
 602                         return $this->getFullURL();
 603                 }
 604
 605                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 606                 if ( $query == '' ) {
 607                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 608                 } else {
 609                         if ( $query == '-' ) {
 610                                 $query = '';
 611                         }
 612                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 613                 }
 614                 return $url;
 615         }
 616
 617         /**
 618          * Get an HTML-escaped version of the URL form, suitable for
 619          * using in a link, without a server name or fragment
 620          * @param string $query an optional query string
 621          * @return string the URL
 622          * @access public
 623          */
 624         function escapeLocalURL( $query = '' ) {
 625                 return htmlspecialchars( $this->getLocalURL( $query ) );
 626         }
 627
 628         /**
 629          * Get an HTML-escaped version of the URL form, suitable for
 630          * using in a link, including the server name and fragment
 631          *
 632          * @return string the URL
 633          * @param string $query an optional query string
 634          * @access public
 635          */
 636         function escapeFullURL( $query = '' ) {
 637                 return htmlspecialchars( $this->getFullURL( $query ) );
 638         }
 639
 640         /**
 641          * Get the URL form for an internal link.
 642          * - Used in various Squid-related code, in case we have a different
 643          * internal hostname for the server from the exposed one.
 644          *
 645          * @param string $query an optional query string
 646          * @return string the URL
 647          * @access public
 648          */
 649         function getInternalURL( $query = '' ) {
 650                 global $wgInternalServer;
 651                 return $wgInternalServer . $this->getLocalURL( $query );
 652         }
 653
 654         /**
 655          * Get the edit URL for this Title
 656          * @return string the URL, or a null string if this is an
 657          *      interwiki link
 658          * @access public
 659          */
 660         function getEditURL() {
 661                 global $wgServer, $wgScript;
 662
 663                 if ( '' != $this->mInterwiki ) { return ''; }
 664                 $s = $this->getLocalURL( 'action=edit' );
 665
 666                 return $s;
 667         }
 668
 669         /**
 670          * Get the HTML-escaped displayable text form.
 671          * Used for the title field in <a> tags.
 672          * @return string the text, including any prefixes
 673          * @access public
 674          */
 675         function getEscapedText() {
 676                 return htmlspecialchars( $this->getPrefixedText() );
 677         }
 678
 679         /**
 680          * Is this Title interwiki?
 681          * @return boolean
 682          * @access public
 683          */
 684         function isExternal() { return ( '' != $this->mInterwiki ); }
 685
 686         /**
 687          * Does the title correspond to a protected article?
 688          * @return boolean
 689          * @access public
 690          */
 691         function isProtected() {
 692                 if ( -1 == $this->mNamespace ) { return true; }
 693                 $a = $this->getRestrictions();
 694                 if ( in_array( 'sysop', $a ) ) { return true; }
 695                 return false;
 696         }
 697
 698         /**
 699          * Is the page a log page, i.e. one where the history is messed up by
 700          * LogPage.php? This used to be used for suppressing diff links in
 701          * recent changes, but now that's done by setting a flag in the
 702          * recentchanges table. Hence, this probably is no longer used.
 703          *
 704          * @deprecated
 705          * @access public
 706          */
 707         function isLog() {
 708                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 709                         return false;
 710                 }
 711                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 712                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 713                         return true;
 714                 }
 715                 return false;
 716         }
 717
 718         /**
 719          * Is $wgUser is watching this page?
 720          * @return boolean
 721          * @access public
 722          */
 723         function userIsWatching() {
 724                 global $wgUser;
 725
 726                 if ( -1 == $this->mNamespace ) { return false; }
 727                 if ( 0 == $wgUser->getID() ) { return false; }
 728
 729                 return $wgUser->isWatched( $this );
 730         }
 731
 732         /**
 733          * Can $wgUser edit this page?
 734          * @return boolean
 735          * @access public
 736          */
 737         function userCanEdit() {
 738                 global $wgUser;
 739                 if( NS_SPECIAL == $this->mNamespace ) {
 740                         return false;
 741                 }
 742                 if( NS_MEDIAWIKI == $this->mNamespace &&
 743                     !$wgUser->isAllowed('editinterface') ) {
 744                         return false;
 745                 }
 746                 if( $this->mDbkeyform == '_' ) {
 747                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 748                         return false;
 749                 }
 750
 751                 # protect global styles and js
 752                 if ( NS_MEDIAWIKI == $this->mNamespace
 753                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 754                      && !$wgUser->isAllowed('editinterface') ) {
 755                         return false;
 756                 }
 757
 758                 # protect css/js subpages of user pages
 759                 # XXX: this might be better using restrictions
 760                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 761                 if( NS_USER == $this->mNamespace
 762                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 763                         && !$wgUser->isAllowed('editinterface')
 764                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 765                         return false;
 766                 }
 767
 768                 foreach( $this->getRestrictions() as $right ) {
 769                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 770                                 return false;
 771                         }
 772                 }
 773                 return true;
 774         }
 775
 776         /**
 777          * Can $wgUser read this page?
 778          * @return boolean
 779          * @access public
 780          */
 781         function userCanRead() {
 782                 global $wgUser;
 783
 784                 if( $wgUser->isAllowed('read') ) {
 785                         return true;
 786                 } else {
 787                         global $wgWhitelistRead;
 788
 789                         /** If anon users can create an account,
 790                             they need to reach the login page first! */
 791                         if( $wgUser->isAllowed( 'createaccount' )
 792                             && $this->mId == NS_SPECIAL
 793                             && $this->getText() == 'Userlogin' ) {
 794                                 return true;
 795                         }
 796
 797                         /** some pages are explicitly allowed */
 798                         $name = $this->getPrefixedText();
 799                         if( in_array( $name, $wgWhitelistRead ) ) {
 800                                 return true;
 801                         }
 802
 803                         # Compatibility with old settings
 804                         if( $this->getNamespace() == NS_MAIN ) {
 805                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 806                                         return true;
 807                                 }
 808                         }
 809                 }
 810                 return false;
 811         }
 812
 813         /**
 814          * Is this a .css or .js subpage of a user page?
 815          * @return bool
 816          * @access public
 817          */
 818         function isCssJsSubpage() {
 819                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 820         }
 821         /**
 822          * Is this a .css subpage of a user page?
 823          * @return bool
 824          * @access public
 825          */
 826         function isCssSubpage() {
 827                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 828         }
 829         /**
 830          * Is this a .js subpage of a user page?
 831          * @return bool
 832          * @access public
 833          */
 834         function isJsSubpage() {
 835                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 836         }
 837         /**
 838          * Protect css/js subpages of user pages: can $wgUser edit
 839          * this page?
 840          *
 841          * @return boolean
 842          * @todo XXX: this might be better using restrictions
 843          * @access public
 844          */
 845         function userCanEditCssJsSubpage() {
 846                 global $wgUser;
 847                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 848         }
 849
 850         /**
 851          * Accessor/initialisation for mRestrictions
 852          * @return array the array of groups allowed to edit this article
 853          * @access public
 854          */
 855         function getRestrictions() {
 856                 $id = $this->getArticleID();
 857                 if ( 0 == $id ) { return array(); }
 858
 859                 if ( ! $this->mRestrictionsLoaded ) {
 860                         $dbr =& wfGetDB( DB_SLAVE );
 861                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 862                         $this->mRestrictions = explode( ',', trim( $res ) );
 863                         $this->mRestrictionsLoaded = true;
 864                 }
 865                 return $this->mRestrictions;
 866         }
 867
 868         /**
 869          * Is there a version of this page in the deletion archive?
 870          * @return int the number of archived revisions
 871          * @access public
 872          */
 873         function isDeleted() {
 874                 $fname = 'Title::isDeleted';
 875                 $dbr =& wfGetDB( DB_SLAVE );
 876                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 877                         'ar_title' => $this->getDBkey() ), $fname );
 878                 return (int)$n;
 879         }
 880
 881         /**
 882          * Get the article ID for this Title from the link cache,
 883          * adding it if necessary
 884          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 885          *      for update
 886          * @return int the ID
 887          * @access public
 888          */
 889         function getArticleID( $flags = 0 ) {
 890                 global $wgLinkCache;
 891
 892                 if ( $flags & GAID_FOR_UPDATE ) {
 893                         $oldUpdate = $wgLinkCache->forUpdate( true );
 894                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 895                         $wgLinkCache->forUpdate( $oldUpdate );
 896                 } else {
 897                         if ( -1 == $this->mArticleID ) {
 898                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 899                         }
 900                 }
 901                 return $this->mArticleID;
 902         }
 903
 904         /**
 905          * This clears some fields in this object, and clears any associated
 906          * keys in the "bad links" section of $wgLinkCache.
 907          *
 908          * - This is called from Article::insertNewArticle() to allow
 909          * loading of the new cur_id. It's also called from
 910          * Article::doDeleteArticle()
 911          *
 912          * @param int $newid the new Article ID
 913          * @access public
 914          */
 915         function resetArticleID( $newid ) {
 916                 global $wgLinkCache;
 917                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 918
 919                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 920                 else { $this->mArticleID = $newid; }
 921                 $this->mRestrictionsLoaded = false;
 922                 $this->mRestrictions = array();
 923         }
 924
 925         /**
 926          * Updates cur_touched for this page; called from LinksUpdate.php
 927          * @return bool true if the update succeded
 928          * @access public
 929          */
 930         function invalidateCache() {
 931                 $now = wfTimestampNow();
 932                 $dbw =& wfGetDB( DB_MASTER );
 933                 $success = $dbw->update( 'cur',
 934                         array( /* SET */
 935                                 'cur_touched' => $dbw->timestamp()
 936                         ), array( /* WHERE */
 937                                 'cur_namespace' => $this->getNamespace() ,
 938                                 'cur_title' => $this->getDBkey()
 939                         ), 'Title::invalidateCache'
 940                 );
 941                 return $success;
 942         }
 943
 944         /**
 945          * Prefix some arbitrary text with the namespace or interwiki prefix
 946          * of this object
 947          *
 948          * @param string $name the text
 949          * @return string the prefixed text
 950          * @access private
 951          */
 952         /* private */ function prefix( $name ) {
 953                 global $wgContLang;
 954
 955                 $p = '';
 956                 if ( '' != $this->mInterwiki ) {
 957                         $p = $this->mInterwiki . ':';
 958                 }
 959                 if ( 0 != $this->mNamespace ) {
 960                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 961                 }
 962                 return $p . $name;
 963         }
 964
 965         /**
 966          * Secure and split - main initialisation function for this object
 967          *
 968          * Assumes that mDbkeyform has been set, and is urldecoded
 969          * and uses underscores, but not otherwise munged.  This function
 970          * removes illegal characters, splits off the interwiki and
 971          * namespace prefixes, sets the other forms, and canonicalizes
 972          * everything.
 973          * @return bool true on success
 974          * @access private
 975          */
 976         /* private */ function secureAndSplit()
 977         {
 978                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 979                 $fname = 'Title::secureAndSplit';
 980                 wfProfileIn( $fname );
 981
 982                 static $imgpre = false;
 983                 static $rxTc = false;
 984
 985                 # Initialisation
 986                 if ( $imgpre === false ) {
 987                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
 988                         # % is needed as well
 989                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/';
 990                 }
 991
 992                 $this->mInterwiki = $this->mFragment = '';
 993                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 994
 995                 # Clean up whitespace
 996                 #
 997                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 998                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 999
1000                 if ( '' == $t ) {
1001                         wfProfileOut( $fname );
1002                         return false;
1003                 }
1004
1005                 global $wgUseLatin1;
1006                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1007                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1008                         wfProfileOut( $fname );
1009                         return false;
1010                 }
1011
1012                 $this->mDbkeyform = $t;
1013                 $done = false;
1014
1015                 # :Image: namespace
1016                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1017                         $t = substr( $t, 1 );
1018                 }
1019
1020                 # Initial colon indicating main namespace
1021                 if ( ':' == $t{0} ) {
1022                         $r = substr( $t, 1 );
1023                         $this->mNamespace = NS_MAIN;
1024                 } else {
1025                         # Namespace or interwiki prefix
1026                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1027                                 #$p = strtolower( $m[1] );
1028                                 $p = $m[1];
1029                                 $lowerNs = strtolower( $p );
1030                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1031                                         # Canonical namespace
1032                                         $t = $m[2];
1033                                         $this->mNamespace = $ns;
1034                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1035                                         # Ordinary namespace
1036                                         $t = $m[2];
1037                                         $this->mNamespace = $ns;
1038                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1039                                         # Interwiki link
1040                                         $t = $m[2];
1041                                         $this->mInterwiki = $p;
1042
1043                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1044                                                 $done = true;
1045                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1046                                                 $done = true;
1047                                         }
1048                                 }
1049                         }
1050                         $r = $t;
1051                 }
1052
1053                 # Redundant interwiki prefix to the local wiki
1054                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1055                         $this->mInterwiki = '';
1056                 }
1057                 # We already know that some pages won't be in the database!
1058                 #
1059                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1060                         $this->mArticleID = 0;
1061                 }
1062                 $f = strstr( $r, '#' );
1063                 if ( false !== $f ) {
1064                         $this->mFragment = substr( $f, 1 );
1065                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1066                         # remove whitespace again: prevents "Foo_bar_#"
1067                         # becoming "Foo_bar_"
1068                         $r = preg_replace( '/_*$/', '', $r );
1069                 }
1070
1071                 # Reject illegal characters.
1072                 #
1073                 if( preg_match( $rxTc, $r ) ) {
1074                         wfProfileOut( $fname );
1075                         return false;
1076                 }
1077
1078                 # "." and ".." conflict with the directories of those namesa
1079                 if ( strpos( $r, '.' ) !== false &&
1080                      ( $r === '.' || $r === '..' ||
1081                        strpos( $r, './' ) === 0  ||
1082                        strpos( $r, '../' ) === 0 ||
1083                        strpos( $r, '/./' ) !== false ||
1084                        strpos( $r, '/../' ) !== false ) )
1085                 {
1086                         wfProfileOut( $fname );
1087                         return false;
1088                 }
1089
1090                 # We shouldn't need to query the DB for the size.
1091                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1092                 if ( strlen( $r ) > 255 ) {
1093                         return false;
1094                 }
1095
1096                 # Initial capital letter
1097                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1098                         $t = $wgContLang->ucfirst( $r );
1099                 } else {
1100                         $t = $r;
1101                 }
1102
1103                 # Fill fields
1104                 $this->mDbkeyform = $t;
1105                 $this->mUrlform = wfUrlencode( $t );
1106
1107                 $this->mTextform = str_replace( '_', ' ', $t );
1108
1109                 wfProfileOut( $fname );
1110                 return true;
1111         }
1112
1113         /**
1114          * Get a Title object associated with the talk page of this article
1115          * @return Title the object for the talk page
1116          * @access public
1117          */
1118         function getTalkPage() {
1119                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1120         }
1121
1122         /**
1123          * Get a title object associated with the subject page of this
1124          * talk page
1125          *
1126          * @return Title the object for the subject page
1127          * @access public
1128          */
1129         function getSubjectPage() {
1130                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1131         }
1132
1133         /**
1134          * Get an array of Title objects linking to this Title
1135          * - Also stores the IDs in the link cache.
1136          *
1137          * @param string $options may be FOR UPDATE
1138          * @return array the Title objects linking here
1139          * @access public
1140          */
1141         function getLinksTo( $options = '' ) {
1142                 global $wgLinkCache;
1143                 $id = $this->getArticleID();
1144
1145                 if ( $options ) {
1146                         $db =& wfGetDB( DB_MASTER );
1147                 } else {
1148                         $db =& wfGetDB( DB_SLAVE );
1149                 }
1150                 $cur = $db->tableName( 'cur' );
1151                 $links = $db->tableName( 'links' );
1152
1153                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1154                 $res = $db->query( $sql, 'Title::getLinksTo' );
1155                 $retVal = array();
1156                 if ( $db->numRows( $res ) ) {
1157                         while ( $row = $db->fetchObject( $res ) ) {
1158                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1159                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1160                                         $retVal[] = $titleObj;
1161                                 }
1162                         }
1163                 }
1164                 $db->freeResult( $res );
1165                 return $retVal;
1166         }
1167
1168         /**
1169          * Get an array of Title objects linking to this non-existent title.
1170          * - Also stores the IDs in the link cache.
1171          *
1172          * @param string $options may be FOR UPDATE
1173          * @return array the Title objects linking here
1174          * @access public
1175          */
1176         function getBrokenLinksTo( $options = '' ) {
1177                 global $wgLinkCache;
1178
1179                 if ( $options ) {
1180                         $db =& wfGetDB( DB_MASTER );
1181                 } else {
1182                         $db =& wfGetDB( DB_SLAVE );
1183                 }
1184                 $cur = $db->tableName( 'cur' );
1185                 $brokenlinks = $db->tableName( 'brokenlinks' );
1186                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1187
1188                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1189                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1190                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1191                 $retVal = array();
1192                 if ( $db->numRows( $res ) ) {
1193                         while ( $row = $db->fetchObject( $res ) ) {
1194                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1195                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1196                                 $retVal[] = $titleObj;
1197                         }
1198                 }
1199                 $db->freeResult( $res );
1200                 return $retVal;
1201         }
1202
1203         /**
1204          * Get a list of URLs to purge from the Squid cache when this
1205          * page changes
1206          *
1207          * @return array the URLs
1208          * @access public
1209          */
1210         function getSquidURLs() {
1211                 return array(
1212                         $this->getInternalURL(),
1213                         $this->getInternalURL( 'action=history' )
1214                 );
1215         }
1216
1217         /**
1218          * Move this page without authentication
1219          * @param Title &$nt the new page Title
1220          * @access public
1221          */
1222         function moveNoAuth( &$nt ) {
1223                 return $this->moveTo( $nt, false );
1224         }
1225
1226         /**
1227          * Move a title to a new location
1228          * @param Title &$nt the new title
1229          * @param bool $auth indicates whether $wgUser's permissions
1230          *      should be checked
1231          * @return mixed true on success, message name on failure
1232          * @access public
1233          */
1234         function moveTo( &$nt, $auth = true ) {
1235                 if( !$this or !$nt ) {
1236                         return 'badtitletext';
1237                 }
1238
1239                 $fname = 'Title::move';
1240                 $oldid = $this->getArticleID();
1241                 $newid = $nt->getArticleID();
1242
1243                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1244                         return 'articleexists';
1245                 }
1246                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1247                          ( '' == $this->getDBkey() ) ||
1248                          ( '' != $this->getInterwiki() ) ||
1249                          ( !$oldid ) ||
1250                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1251                          ( '' == $nt->getDBkey() ) ||
1252                          ( '' != $nt->getInterwiki() ) ) {
1253                         return 'badarticleerror';
1254                 }
1255
1256                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1257                         return 'protectedpage';
1258                 }
1259
1260                 # The move is allowed only if (1) the target doesn't exist, or
1261                 # (2) the target is a redirect to the source, and has no history
1262                 # (so we can undo bad moves right after they're done).
1263
1264                 if ( 0 != $newid ) { # Target exists; check for validity
1265                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1266                                 return 'articleexists';
1267                         }
1268                         $this->moveOverExistingRedirect( $nt );
1269                 } else { # Target didn't exist, do normal move.
1270                         $this->moveToNewTitle( $nt, $newid );
1271                 }
1272
1273                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1274
1275                 $dbw =& wfGetDB( DB_MASTER );
1276                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1277                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1278                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1279                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1280
1281                 # Update watchlists
1282
1283                 $oldnamespace = $this->getNamespace() & ~1;
1284                 $newnamespace = $nt->getNamespace() & ~1;
1285                 $oldtitle = $this->getDBkey();
1286                 $newtitle = $nt->getDBkey();
1287
1288                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1289                         WatchedItem::duplicateEntries( $this, $nt );
1290                 }
1291
1292                 # Update search engine
1293                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1294                 $u->doUpdate();
1295                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1296                 $u->doUpdate();
1297
1298                 return true;
1299         }
1300
1301         /**
1302          * Move page to a title which is at present a redirect to the
1303          * source page
1304          *
1305          * @param Title &$nt the page to move to, which should currently
1306          *      be a redirect
1307          * @access private
1308          */
1309         /* private */ function moveOverExistingRedirect( &$nt ) {
1310                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1311                 $fname = 'Title::moveOverExistingRedirect';
1312                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1313
1314                 $now = wfTimestampNow();
1315                 $won = wfInvertTimestamp( $now );
1316                 $newid = $nt->getArticleID();
1317                 $oldid = $this->getArticleID();
1318                 $dbw =& wfGetDB( DB_MASTER );
1319                 $links = $dbw->tableName( 'links' );
1320
1321                 # Change the name of the target page:
1322                 $dbw->update( 'cur',
1323                         /* SET */ array(
1324                                 'cur_touched' => $dbw->timestamp($now),
1325                                 'cur_namespace' => $nt->getNamespace(),
1326                                 'cur_title' => $nt->getDBkey()
1327                         ),
1328                         /* WHERE */ array( 'cur_id' => $oldid ),
1329                         $fname
1330                 );
1331                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1332
1333                 # Repurpose the old redirect. We don't save it to history since
1334                 # by definition if we've got here it's rather uninteresting.
1335
1336                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1337                 $dbw->update( 'cur',
1338                         /* SET */ array(
1339                                 'cur_touched' => $dbw->timestamp($now),
1340                                 'cur_timestamp' => $dbw->timestamp($now),
1341                                 'inverse_timestamp' => $won,
1342                                 'cur_namespace' => $this->getNamespace(),
1343                                 'cur_title' => $this->getDBkey(),
1344                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1345                                 'cur_comment' => $comment,
1346                                 'cur_user' => $wgUser->getID(),
1347                                 'cur_minor_edit' => 0,
1348                                 'cur_counter' => 0,
1349                                 'cur_restrictions' => '',
1350                                 'cur_user_text' => $wgUser->getName(),
1351                                 'cur_is_redirect' => 1,
1352                                 'cur_is_new' => 1
1353                         ),
1354                         /* WHERE */ array( 'cur_id' => $newid ),
1355                         $fname
1356                 );
1357
1358                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1359
1360                 # Fix the redundant names for the past revisions of the target page.
1361                 # The redirect should have no old revisions.
1362                 $dbw->update(
1363                         /* table */ 'old',
1364                         /* SET */ array(
1365                                 'old_namespace' => $nt->getNamespace(),
1366                                 'old_title' => $nt->getDBkey(),
1367                         ),
1368                         /* WHERE */ array(
1369                                 'old_namespace' => $this->getNamespace(),
1370                                 'old_title' => $this->getDBkey(),
1371                         ),
1372                         $fname
1373                 );
1374
1375                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1376
1377                 # Swap links
1378
1379                 # Load titles and IDs
1380                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1381                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1382
1383                 # Delete them all
1384                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1385                 $dbw->query( $sql, $fname );
1386
1387                 # Reinsert
1388                 if ( count( $linksToOld ) || count( $linksToNew )) {
1389                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1390                         $first = true;
1391
1392                         # Insert links to old title
1393                         foreach ( $linksToOld as $linkTitle ) {
1394                                 if ( $first ) {
1395                                         $first = false;
1396                                 } else {
1397                                         $sql .= ',';
1398                                 }
1399                                 $id = $linkTitle->getArticleID();
1400                                 $sql .= "($id,$newid)";
1401                         }
1402
1403                         # Insert links to new title
1404                         foreach ( $linksToNew as $linkTitle ) {
1405                                 if ( $first ) {
1406                                         $first = false;
1407                                 } else {
1408                                         $sql .= ',';
1409                                 }
1410                                 $id = $linkTitle->getArticleID();
1411                                 $sql .= "($id, $oldid)";
1412                         }
1413
1414                         $dbw->query( $sql, DB_MASTER, $fname );
1415                 }
1416
1417                 # Now, we record the link from the redirect to the new title.
1418                 # It should have no other outgoing links...
1419                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1420                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1421
1422                 # Clear linkscc
1423                 LinkCache::linksccClearLinksTo( $oldid );
1424                 LinkCache::linksccClearLinksTo( $newid );
1425
1426                 # Purge squid
1427                 if ( $wgUseSquid ) {
1428                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1429                         $u = new SquidUpdate( $urls );
1430                         $u->doUpdate();
1431                 }
1432         }
1433
1434         /**
1435          * Move page to non-existing title.
1436          * @param Title &$nt the new Title
1437          * @param int &$newid set to be the new article ID
1438          * @access private
1439          */
1440         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1441                 global $wgUser, $wgLinkCache, $wgUseSquid;
1442                 $fname = 'MovePageForm::moveToNewTitle';
1443                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1444
1445                 $newid = $nt->getArticleID();
1446                 $oldid = $this->getArticleID();
1447                 $dbw =& wfGetDB( DB_MASTER );
1448                 $now = $dbw->timestamp();
1449                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1450                 wfSeedRandom();
1451                 $rand = wfRandom();
1452
1453                 # Rename cur entry
1454                 $dbw->update( 'cur',
1455                         /* SET */ array(
1456                                 'cur_touched' => $now,
1457                                 'cur_namespace' => $nt->getNamespace(),
1458                                 'cur_title' => $nt->getDBkey()
1459                         ),
1460                         /* WHERE */ array( 'cur_id' => $oldid ),
1461                         $fname
1462                 );
1463
1464                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1465
1466                 # Insert redirect
1467                 $dbw->insert( 'cur', array(
1468                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1469                         'cur_namespace' => $this->getNamespace(),
1470                         'cur_title' => $this->getDBkey(),
1471                         'cur_comment' => $comment,
1472                         'cur_user' => $wgUser->getID(),
1473                         'cur_user_text' => $wgUser->getName(),
1474                         'cur_timestamp' => $now,
1475                         'inverse_timestamp' => $won,
1476                         'cur_touched' => $now,
1477                         'cur_is_redirect' => 1,
1478                         'cur_random' => $rand,
1479                         'cur_is_new' => 1,
1480                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1481                 );
1482                 $newid = $dbw->insertId();
1483                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1484
1485                 # Rename old entries
1486                 $dbw->update(
1487                         /* table */ 'old',
1488                         /* SET */ array(
1489                                 'old_namespace' => $nt->getNamespace(),
1490                                 'old_title' => $nt->getDBkey()
1491                         ),
1492                         /* WHERE */ array(
1493                                 'old_namespace' => $this->getNamespace(),
1494                                 'old_title' => $this->getDBkey()
1495                         ), $fname
1496                 );
1497
1498                 # Record in RC
1499                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1500
1501                 # Purge squid and linkscc as per article creation
1502                 Article::onArticleCreate( $nt );
1503
1504                 # Any text links to the old title must be reassigned to the redirect
1505                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1506                 LinkCache::linksccClearLinksTo( $oldid );
1507
1508                 # Record the just-created redirect's linking to the page
1509                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1510
1511                 # Non-existent target may have had broken links to it; these must
1512                 # now be removed and made into good links.
1513                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1514                 $update->fixBrokenLinks();
1515
1516                 # Purge old title from squid
1517                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1518                 $titles = $nt->getLinksTo();
1519                 if ( $wgUseSquid ) {
1520                         $urls = $this->getSquidURLs();
1521                         foreach ( $titles as $linkTitle ) {
1522                                 $urls[] = $linkTitle->getInternalURL();
1523                         }
1524                         $u = new SquidUpdate( $urls );
1525                         $u->doUpdate();
1526                 }
1527         }
1528
1529         /**
1530          * Checks if $this can be moved to a given Title
1531          * - Selects for update, so don't call it unless you mean business
1532          *
1533          * @param Title &$nt the new title to check
1534          * @access public
1535          */
1536         function isValidMoveTarget( $nt ) {
1537                 $fname = 'Title::isValidMoveTarget';
1538                 $dbw =& wfGetDB( DB_MASTER );
1539
1540                 # Is it a redirect?
1541                 $id  = $nt->getArticleID();
1542                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1543                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1544
1545                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1546                         # Not a redirect
1547                         return false;
1548                 }
1549
1550                 # Does the redirect point to the source?
1551                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1552                         $redirTitle = Title::newFromText( $m[1] );
1553                         if( !is_object( $redirTitle ) ||
1554                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1555                                 return false;
1556                         }
1557                 }
1558
1559                 # Does the article have a history?
1560                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1561                         array(
1562                                 'old_namespace' => $nt->getNamespace(),
1563                                 'old_title' => $nt->getDBkey()
1564                         ), $fname, 'FOR UPDATE'
1565                 );
1566
1567                 # Return true if there was no history
1568                 return $row === false;
1569         }
1570
1571         /**
1572          * Create a redirect; fails if the title already exists; does
1573          * not notify RC
1574          *
1575          * @param Title $dest the destination of the redirect
1576          * @param string $comment the comment string describing the move
1577          * @return bool true on success
1578          * @access public
1579          */
1580         function createRedirect( $dest, $comment ) {
1581                 global $wgUser;
1582                 if ( $this->getArticleID() ) {
1583                         return false;
1584                 }
1585
1586                 $fname = 'Title::createRedirect';
1587                 $dbw =& wfGetDB( DB_MASTER );
1588                 $now = wfTimestampNow();
1589                 $won = wfInvertTimestamp( $now );
1590                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1591
1592                 $dbw->insert( 'cur', array(
1593                         'cur_id' => $seqVal,
1594                         'cur_namespace' => $this->getNamespace(),
1595                         'cur_title' => $this->getDBkey(),
1596                         'cur_comment' => $comment,
1597                         'cur_user' => $wgUser->getID(),
1598                         'cur_user_text' => $wgUser->getName(),
1599                         'cur_timestamp' => $now,
1600                         'inverse_timestamp' => $won,
1601                         'cur_touched' => $now,
1602                         'cur_is_redirect' => 1,
1603                         'cur_is_new' => 1,
1604                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1605                 ), $fname );
1606                 $newid = $dbw->insertId();
1607                 $this->resetArticleID( $newid );
1608
1609                 # Link table
1610                 if ( $dest->getArticleID() ) {
1611                         $dbw->insert( 'links',
1612                                 array(
1613                                         'l_to' => $dest->getArticleID(),
1614                                         'l_from' => $newid
1615                                 ), $fname
1616                         );
1617                 } else {
1618                         $dbw->insert( 'brokenlinks',
1619                                 array(
1620                                         'bl_to' => $dest->getPrefixedDBkey(),
1621                                         'bl_from' => $newid
1622                                 ), $fname
1623                         );
1624                 }
1625
1626                 Article::onArticleCreate( $this );
1627                 return true;
1628         }
1629
1630         /**
1631          * Get categories to which this Title belongs and return an array of
1632          * categories' names.
1633          *
1634          * @return array an array of parents in the form:
1635          *      $parent => $currentarticle
1636          * @access public
1637          */
1638         function getParentCategories() {
1639                 global $wgContLang,$wgUser;
1640
1641                 $titlekey = $this->getArticleId();
1642                 $sk =& $wgUser->getSkin();
1643                 $parents = array();
1644                 $dbr =& wfGetDB( DB_SLAVE );
1645                 $categorylinks = $dbr->tableName( 'categorylinks' );
1646
1647                 # NEW SQL
1648                 $sql = "SELECT * FROM $categorylinks"
1649                      ." WHERE cl_from='$titlekey'"
1650                          ." AND cl_from <> '0'"
1651                          ." ORDER BY cl_sortkey";
1652
1653                 $res = $dbr->query ( $sql ) ;
1654
1655                 if($dbr->numRows($res) > 0) {
1656                         while ( $x = $dbr->fetchObject ( $res ) )
1657                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1658                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1659                         $dbr->freeResult ( $res ) ;
1660                 } else {
1661                         $data = '';
1662                 }
1663                 return $data;
1664         }
1665
1666         /**
1667          * Get a tree of parent categories
1668          * @param array $children an array with the children in the keys, to check for circular refs
1669          * @return array
1670          * @access public
1671          */
1672         function getParentCategoryTree( $children = array() ) {
1673                 $parents = $this->getParentCategories();
1674
1675                 if($parents != '') {
1676                         foreach($parents as $parent => $current)
1677                         {
1678                                 if ( array_key_exists( $parent, $children ) ) {
1679                                         # Circular reference
1680                                         $stack[$parent] = array();
1681                                 } else {
1682                                         $nt = Title::newFromText($parent);
1683                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1684                                 }
1685                         }
1686                         return $stack;
1687                 } else {
1688                         return array();
1689                 }
1690         }
1691
1692
1693         /**
1694          * Get an associative array for selecting this title from
1695          * the "cur" table
1696          *
1697          * @return array
1698          * @access public
1699          */
1700         function curCond() {
1701                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1702         }
1703
1704         /**
1705          * Get an associative array for selecting this title from the
1706          * "old" table
1707          *
1708          * @return array
1709          * @access public
1710          */
1711         function oldCond() {
1712                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1713         }
1714
1715         /**
1716          * Get the revision ID of the previous revision
1717          *
1718          * @param integer $revision  Revision ID. Get the revision that was before this one.
1719          * @return interger $oldrevision|false
1720          */
1721         function getPreviousRevisionID( $revision ) {
1722                 $dbr =& wfGetDB( DB_SLAVE );
1723                 return $dbr->selectField( 'old', 'old_id',
1724                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1725                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1726                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1727         }
1728
1729         /**
1730          * Get the revision ID of the next revision
1731          *
1732          * @param integer $revision  Revision ID. Get the revision that was after this one.
1733          * @return interger $oldrevision|false
1734          */
1735         function getNextRevisionID( $revision ) {
1736                 $dbr =& wfGetDB( DB_SLAVE );
1737                 return $dbr->selectField( 'old', 'old_id',
1738                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1739                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1740                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1741         }
1742
1743 }
1744 ?>