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                 /**
  98                  * Convert things like &eacute; into real text...
  99                  */
 100                 global $wgInputEncoding;
 101                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 102
 103                 /**
 104                  * Convert things like &#257; or &#x3017; into real text...
 105                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 106                  */
 107                 $text = wfMungeToUtf8( $text );
 108
 109                 # What was this for? TS 2004-03-03
 110                 # $text = urldecode( $text );
 111
 112                 $t =& new Title();
 113                 $t->mDbkeyform = str_replace( ' ', '_', $text );
 114                 $t->mDefaultNamespace = $defaultNamespace;
 115
 116                 if( $t->secureAndSplit() ) {
 117                         wfProfileOut( $fname );
 118                         return $t;
 119                 } else {
 120                         wfProfileOut( $fname );
 121                         return NULL;
 122                 }
 123         }
 124
 125         /**
 126          * Create a new Title from URL-encoded text. Ensures that
 127          * the given title's length does not exceed the maximum.
 128          * @param string $url the title, as might be taken from a URL
 129          * @return Title the new object, or NULL on an error
 130          * @static
 131          * @access public
 132          */
 133         /* static */ function newFromURL( $url ) {
 134                 global $wgLang, $wgServer;
 135                 $t = new Title();
 136
 137                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 138                 # but some URLs used it as a space replacement and they still come
 139                 # from some external search tools.
 140                 $s = str_replace( '+', ' ', $url );
 141
 142                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 143                 if( $t->secureAndSplit() ) {
 144                         return $t;
 145                 } else {
 146                         return NULL;
 147                 }
 148         }
 149
 150         /**
 151          * Create a new Title from an article ID
 152          * @todo This is inefficiently implemented, the cur row is requested
 153          * but not used for anything else
 154          * @param int $id the cur_id corresponding to the Title to create
 155          * @return Title the new object, or NULL on an error
 156          * @access public
 157          */
 158         /* static */ function newFromID( $id ) {
 159                 $fname = 'Title::newFromID';
 160                 $dbr =& wfGetDB( DB_SLAVE );
 161                 $row = $dbr->selectRow( 'cur', array( 'cur_namespace', 'cur_title' ),
 162                         array( 'cur_id' => $id ), $fname );
 163                 if ( $row !== false ) {
 164                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 165                 } else {
 166                         $title = NULL;
 167                 }
 168                 return $title;
 169         }
 170
 171         /**
 172          * Create a new Title from a namespace index and a DB key.
 173          * It's assumed that $ns and $title are *valid*, for instance when
 174          * they came directly from the database or a special page name.
 175          * For convenience, spaces are converted to underscores so that
 176          * eg user_text fields can be used directly.
 177          *
 178          * @param int $ns the namespace of the article
 179          * @param string $title the unprefixed database key form
 180          * @return Title the new object
 181          * @static
 182          * @access public
 183          */
 184         /* static */ function &makeTitle( $ns, $title ) {
 185                 $t =& new Title();
 186                 $t->mInterwiki = '';
 187                 $t->mFragment = '';
 188                 $t->mNamespace = IntVal( $ns );
 189                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 190                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 191                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 192                 $t->mTextform = str_replace( '_', ' ', $title );
 193                 return $t;
 194         }
 195
 196         /**
 197          * Create a new Title frrom a namespace index and a DB key.
 198          * The parameters will be checked for validity, which is a bit slower
 199          * than makeTitle() but safer for user-provided data.
 200          * @param int $ns the namespace of the article
 201          * @param string $title the database key form
 202          * @return Title the new object, or NULL on an error
 203          * @static
 204          * @access public
 205          */
 206         /* static */ function makeTitleSafe( $ns, $title ) {
 207                 $t = new Title();
 208                 $t->mDbkeyform = Title::makeName( $ns, $title );
 209                 if( $t->secureAndSplit() ) {
 210                         return $t;
 211                 } else {
 212                         return NULL;
 213                 }
 214         }
 215
 216         /**
 217          * Create a new Title for the Main Page
 218          * @static
 219          * @return Title the new object
 220          * @access public
 221          */
 222         /* static */ function newMainPage() {
 223                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 224         }
 225
 226         /**
 227          * Create a new Title for a redirect
 228          * @param string $text the redirect title text
 229          * @return Title the new object, or NULL if the text is not a
 230          *      valid redirect
 231          * @static
 232          * @access public
 233          */
 234         /* static */ function newFromRedirect( $text ) {
 235                 global $wgMwRedir;
 236                 $rt = NULL;
 237                 if ( $wgMwRedir->matchStart( $text ) ) {
 238                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 239                                 # categories are escaped using : for example one can enter:
 240                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 241                                 if ( substr($m[1],0,1) == ':') {
 242                                         # We don't want to keep the ':'
 243                                         $m[1] = substr( $m[1], 1 );
 244                                 }
 245
 246                                 $rt = Title::newFromText( $m[1] );
 247                                 # Disallow redirects to Special:Userlogout
 248                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 249                                         $rt = NULL;
 250                                 }
 251                         }
 252                 }
 253                 return $rt;
 254         }
 255
 256 #----------------------------------------------------------------------------
 257 #       Static functions
 258 #----------------------------------------------------------------------------
 259
 260         /**
 261          * Get the prefixed DB key associated with an ID
 262          * @param int $id the cur_id of the article
 263          * @return Title an object representing the article, or NULL
 264          *      if no such article was found
 265          * @static
 266          * @access public
 267          */
 268         /* static */ function nameOf( $id ) {
 269                 $fname = 'Title::nameOf';
 270                 $dbr =& wfGetDB( DB_SLAVE );
 271
 272                 $s = $dbr->selectRow( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 273                 if ( $s === false ) { return NULL; }
 274
 275                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 276                 return $n;
 277         }
 278
 279         /**
 280          * Get a regex character class describing the legal characters in a link
 281          * @return string the list of characters, not delimited
 282          * @static
 283          * @access public
 284          */
 285         /* static */ function legalChars() {
 286                 # Missing characters:
 287                 #  * []|# Needed for link syntax
 288                 #  * % and + are corrupted by Apache when they appear in the path
 289                 #
 290                 # % seems to work though
 291                 #
 292                 # The problem with % is that URLs are double-unescaped: once by Apache's
 293                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 294                 # Our code does not double-escape to compensate for this, indeed double escaping
 295                 # would break if the double-escaped title was passed in the query string
 296                 # rather than the path. This is a minor security issue because articles can be
 297                 # created such that they are hard to view or edit. -- TS
 298                 #
 299                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 300                 # this breaks interlanguage links
 301
 302                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 303                 return $set;
 304         }
 305
 306         /**
 307          * Get a string representation of a title suitable for
 308          * including in a search index
 309          *
 310          * @param int $ns a namespace index
 311          * @param string $title text-form main part
 312          * @return string a stripped-down title string ready for the
 313          *      search index
 314          */
 315         /* static */ function indexTitle( $ns, $title ) {
 316                 global $wgDBminWordLen, $wgContLang;
 317                 require_once( 'SearchEngine.php' );
 318
 319                 $lc = SearchEngine::legalSearchChars() . '&#;';
 320                 $t = $wgContLang->stripForSearch( $title );
 321                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 322                 $t = strtolower( $t );
 323
 324                 # Handle 's, s'
 325                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 326                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 327
 328                 $t = preg_replace( "/\\s+/", ' ', $t );
 329
 330                 if ( $ns == NS_IMAGE ) {
 331                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 332                 }
 333                 return trim( $t );
 334         }
 335
 336         /*
 337          * Make a prefixed DB key from a DB key and a namespace index
 338          * @param int $ns numerical representation of the namespace
 339          * @param string $title the DB key form the title
 340          * @return string the prefixed form of the title
 341          */
 342         /* static */ function makeName( $ns, $title ) {
 343                 global $wgContLang;
 344
 345                 $n = $wgContLang->getNsText( $ns );
 346                 if ( '' == $n ) { return $title; }
 347                 else { return $n.':'.$title; }
 348         }
 349
 350         /**
 351          * Returns the URL associated with an interwiki prefix
 352          * @param string $key the interwiki prefix (e.g. "MeatBall")
 353          * @return the associated URL, containing "$1", which should be
 354          *      replaced by an article title
 355          * @static (arguably)
 356          * @access public
 357          */
 358         function getInterwikiLink( $key ) {
 359                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 360                 $fname = 'Title::getInterwikiLink';
 361
 362                 wfProfileIn( $fname );
 363
 364                 $k = $wgDBname.':interwiki:'.$key;
 365                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 366                         wfProfileOut( $fname );
 367                         return $wgTitleInterwikiCache[$k]->iw_url;
 368                 }
 369
 370                 $s = $wgMemc->get( $k );
 371                 # Ignore old keys with no iw_local
 372                 if( $s && isset( $s->iw_local ) ) {
 373                         $wgTitleInterwikiCache[$k] = $s;
 374                         wfProfileOut( $fname );
 375                         return $s->iw_url;
 376                 }
 377
 378                 $dbr =& wfGetDB( DB_SLAVE );
 379                 $res = $dbr->select( 'interwiki',
 380                         array( 'iw_url', 'iw_local' ),
 381                         array( 'iw_prefix' => $key ), $fname );
 382                 if( !$res ) {
 383                         wfProfileOut( $fname );
 384                         return '';
 385                 }
 386
 387                 $s = $dbr->fetchObject( $res );
 388                 if( !$s ) {
 389                         # Cache non-existence: create a blank object and save it to memcached
 390                         $s = (object)false;
 391                         $s->iw_url = '';
 392                         $s->iw_local = 0;
 393                 }
 394                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 395                 $wgTitleInterwikiCache[$k] = $s;
 396
 397                 wfProfileOut( $fname );
 398                 return $s->iw_url;
 399         }
 400
 401         /**
 402          * Determine whether the object refers to a page within
 403          * this project.
 404          *
 405          * @return bool TRUE if this is an in-project interwiki link
 406          *      or a wikilink, FALSE otherwise
 407          * @access public
 408          */
 409         function isLocal() {
 410                 global $wgTitleInterwikiCache, $wgDBname;
 411
 412                 if ( $this->mInterwiki != '' ) {
 413                         # Make sure key is loaded into cache
 414                         $this->getInterwikiLink( $this->mInterwiki );
 415                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 416                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 417                 } else {
 418                         return true;
 419                 }
 420         }
 421
 422         /**
 423          * Update the cur_touched field for an array of title objects
 424          * @todo Inefficient unless the IDs are already loaded into the
 425          *      link cache
 426          * @param array $titles an array of Title objects to be touched
 427          * @param string $timestamp the timestamp to use instead of the
 428          *      default current time
 429          * @static
 430          * @access public
 431          */
 432         /* static */ function touchArray( $titles, $timestamp = '' ) {
 433                 if ( count( $titles ) == 0 ) {
 434                         return;
 435                 }
 436                 $dbw =& wfGetDB( DB_MASTER );
 437                 if ( $timestamp == '' ) {
 438                         $timestamp = $dbw->timestamp();
 439                 }
 440                 $cur = $dbw->tableName( 'cur' );
 441                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 442                 $first = true;
 443
 444                 foreach ( $titles as $title ) {
 445                         if ( ! $first ) {
 446                                 $sql .= ',';
 447                         }
 448                         $first = false;
 449                         $sql .= $title->getArticleID();
 450                 }
 451                 $sql .= ')';
 452                 if ( ! $first ) {
 453                         $dbw->query( $sql, 'Title::touchArray' );
 454                 }
 455         }
 456
 457 #----------------------------------------------------------------------------
 458 #       Other stuff
 459 #----------------------------------------------------------------------------
 460
 461         /** Simple accessors */
 462         /**
 463          * Get the text form (spaces not underscores) of the main part
 464          * @return string
 465          * @access public
 466          */
 467         function getText() { return $this->mTextform; }
 468         /**
 469          * Get the URL-encoded form of the main part
 470          * @return string
 471          * @access public
 472          */
 473         function getPartialURL() { return $this->mUrlform; }
 474         /**
 475          * Get the main part with underscores
 476          * @return string
 477          * @access public
 478          */
 479         function getDBkey() { return $this->mDbkeyform; }
 480         /**
 481          * Get the namespace index, i.e. one of the NS_xxxx constants
 482          * @return int
 483          * @access public
 484          */
 485         function getNamespace() { return $this->mNamespace; }
 486         /**
 487          * Get the interwiki prefix (or null string)
 488          * @return string
 489          * @access public
 490          */
 491         function getInterwiki() { return $this->mInterwiki; }
 492         /**
 493          * Get the Title fragment (i.e. the bit after the #)
 494          * @return string
 495          * @access public
 496          */
 497         function getFragment() { return $this->mFragment; }
 498         /**
 499          * Get the default namespace index, for when there is no namespace
 500          * @return int
 501          * @access public
 502          */
 503         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 504
 505         /**
 506          * Get title for search index
 507          * @return string a stripped-down title string ready for the
 508          *      search index
 509          */
 510         function getIndexTitle() {
 511                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 512         }
 513
 514         /**
 515          * Get the prefixed database key form
 516          * @return string the prefixed title, with underscores and
 517          *      any interwiki and namespace prefixes
 518          * @access public
 519          */
 520         function getPrefixedDBkey() {
 521                 $s = $this->prefix( $this->mDbkeyform );
 522                 $s = str_replace( ' ', '_', $s );
 523                 return $s;
 524         }
 525
 526         /**
 527          * Get the prefixed title with spaces.
 528          * This is the form usually used for display
 529          * @return string the prefixed title, with spaces
 530          * @access public
 531          */
 532         function getPrefixedText() {
 533                 global $wgContLang;
 534                 if ( empty( $this->mPrefixedText ) ) {
 535                         $s = $this->prefix( $this->mTextform );
 536                         $s = str_replace( '_', ' ', $s );
 537                         $this->mPrefixedText = $s;
 538                 }
 539                 return $this->mPrefixedText;
 540         }
 541
 542         /**
 543          * Get the prefixed title with spaces, plus any fragment
 544          * (part beginning with '#')
 545          * @return string the prefixed title, with spaces and
 546          *      the fragment, including '#'
 547          * @access public
 548          */
 549         function getFullText() {
 550                 global $wgContLang;
 551                 $text = $this->getPrefixedText();
 552                 if( '' != $this->mFragment ) {
 553                         $text .= '#' . $this->mFragment;
 554                 }
 555                 return $text;
 556         }
 557
 558         /**
 559          * Get a URL-encoded title (not an actual URL) including interwiki
 560          * @return string the URL-encoded form
 561          * @access public
 562          */
 563         function getPrefixedURL() {
 564                 $s = $this->prefix( $this->mDbkeyform );
 565                 $s = str_replace( ' ', '_', $s );
 566
 567                 $s = wfUrlencode ( $s ) ;
 568
 569                 # Cleaning up URL to make it look nice -- is this safe?
 570                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 571                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 572                 $s = str_replace( '%28', '(', $s );
 573                 $s = str_replace( '%29', ')', $s );
 574
 575                 return $s;
 576         }
 577
 578         /**
 579          * Get a real URL referring to this title, with interwiki link and
 580          * fragment
 581          *
 582          * @param string $query an optional query string, not used
 583          *      for interwiki links
 584          * @return string the URL
 585          * @access public
 586          */
 587         function getFullURL( $query = '' ) {
 588                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 589
 590                 if ( '' == $this->mInterwiki ) {
 591                         $p = $wgArticlePath;
 592                         return $wgServer . $this->getLocalUrl( $query );
 593                 } else {
 594                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 595                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 596                         if ( '' != $namespace ) {
 597                                 # Can this actually happen? Interwikis shouldn't be parsed.
 598                                 $namepace .= ':';
 599                         }
 600                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 601                         if ( '' != $this->mFragment ) {
 602                                 $url .= '#' . $this->mFragment;
 603                         }
 604                         return $url;
 605                 }
 606         }
 607
 608         /**
 609          * Get a URL with no fragment or server name
 610          * @param string $query an optional query string; if not specified,
 611          *      $wgArticlePath will be used.
 612          * @return string the URL
 613          * @access public
 614          */
 615         function getLocalURL( $query = '' ) {
 616                 global $wgLang, $wgArticlePath, $wgScript;
 617
 618                 if ( $this->isExternal() ) {
 619                         return $this->getFullURL();
 620                 }
 621
 622                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 623                 if ( $query == '' ) {
 624                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 625                 } else {
 626                         if ( $query == '-' ) {
 627                                 $query = '';
 628                         }
 629                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 630                 }
 631                 return $url;
 632         }
 633
 634         /**
 635          * Get an HTML-escaped version of the URL form, suitable for
 636          * using in a link, without a server name or fragment
 637          * @param string $query an optional query string
 638          * @return string the URL
 639          * @access public
 640          */
 641         function escapeLocalURL( $query = '' ) {
 642                 return htmlspecialchars( $this->getLocalURL( $query ) );
 643         }
 644
 645         /**
 646          * Get an HTML-escaped version of the URL form, suitable for
 647          * using in a link, including the server name and fragment
 648          *
 649          * @return string the URL
 650          * @param string $query an optional query string
 651          * @access public
 652          */
 653         function escapeFullURL( $query = '' ) {
 654                 return htmlspecialchars( $this->getFullURL( $query ) );
 655         }
 656
 657         /**
 658          * Get the URL form for an internal link.
 659          * - Used in various Squid-related code, in case we have a different
 660          * internal hostname for the server from the exposed one.
 661          *
 662          * @param string $query an optional query string
 663          * @return string the URL
 664          * @access public
 665          */
 666         function getInternalURL( $query = '' ) {
 667                 global $wgInternalServer;
 668                 return $wgInternalServer . $this->getLocalURL( $query );
 669         }
 670
 671         /**
 672          * Get the edit URL for this Title
 673          * @return string the URL, or a null string if this is an
 674          *      interwiki link
 675          * @access public
 676          */
 677         function getEditURL() {
 678                 global $wgServer, $wgScript;
 679
 680                 if ( '' != $this->mInterwiki ) { return ''; }
 681                 $s = $this->getLocalURL( 'action=edit' );
 682
 683                 return $s;
 684         }
 685
 686         /**
 687          * Get the HTML-escaped displayable text form.
 688          * Used for the title field in <a> tags.
 689          * @return string the text, including any prefixes
 690          * @access public
 691          */
 692         function getEscapedText() {
 693                 return htmlspecialchars( $this->getPrefixedText() );
 694         }
 695
 696         /**
 697          * Is this Title interwiki?
 698          * @return boolean
 699          * @access public
 700          */
 701         function isExternal() { return ( '' != $this->mInterwiki ); }
 702
 703         /**
 704          * Does the title correspond to a protected article?
 705          * @return boolean
 706          * @access public
 707          */
 708         function isProtected() {
 709                 if ( -1 == $this->mNamespace ) { return true; }
 710                 $a = $this->getRestrictions();
 711                 if ( in_array( 'sysop', $a ) ) { return true; }
 712                 return false;
 713         }
 714
 715         /**
 716          * Is $wgUser is watching this page?
 717          * @return boolean
 718          * @access public
 719          */
 720         function userIsWatching() {
 721                 global $wgUser;
 722
 723                 if ( -1 == $this->mNamespace ) { return false; }
 724                 if ( 0 == $wgUser->getID() ) { return false; }
 725
 726                 return $wgUser->isWatched( $this );
 727         }
 728
 729         /**
 730          * Can $wgUser edit this page?
 731          * @return boolean
 732          * @access public
 733          */
 734         function userCanEdit() {
 735                 $fname = 'Title::userCanEdit';
 736                 wfProfileIn( $fname );
 737
 738                 global $wgUser;
 739                 if( NS_SPECIAL == $this->mNamespace ) {
 740                         wfProfileOut( $fname );
 741                         return false;
 742                 }
 743                 if( NS_MEDIAWIKI == $this->mNamespace &&
 744                     !$wgUser->isAllowed('editinterface') ) {
 745                         wfProfileOut( $fname );
 746                         return false;
 747                 }
 748                 if( $this->mDbkeyform == '_' ) {
 749                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 750                         wfProfileOut( $fname );
 751                         return false;
 752                 }
 753
 754                 # protect global styles and js
 755                 if ( NS_MEDIAWIKI == $this->mNamespace
 756                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 757                      && !$wgUser->isAllowed('editinterface') ) {
 758                         wfProfileOut( $fname );
 759                         return false;
 760                 }
 761
 762                 # protect css/js subpages of user pages
 763                 # XXX: this might be better using restrictions
 764                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 765                 if( NS_USER == $this->mNamespace
 766                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 767                         && !$wgUser->isAllowed('editinterface')
 768                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 769                         wfProfileOut( $fname );
 770                         return false;
 771                 }
 772
 773                 foreach( $this->getRestrictions() as $right ) {
 774                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 775                                 wfProfileOut( $fname );
 776                                 return false;
 777                         }
 778                 }
 779                 wfProfileOut( $fname );
 780                 return true;
 781         }
 782
 783         /**
 784          * Can $wgUser read this page?
 785          * @return boolean
 786          * @access public
 787          */
 788         function userCanRead() {
 789                 global $wgUser;
 790
 791                 if( $wgUser->isAllowed('read') ) {
 792                         return true;
 793                 } else {
 794                         global $wgWhitelistRead;
 795
 796                         /** If anon users can create an account,
 797                             they need to reach the login page first! */
 798                         if( $wgUser->isAllowed( 'createaccount' )
 799                             && $this->mId == NS_SPECIAL
 800                             && $this->getText() == 'Userlogin' ) {
 801                                 return true;
 802                         }
 803
 804                         /** some pages are explicitly allowed */
 805                         $name = $this->getPrefixedText();
 806                         if( in_array( $name, $wgWhitelistRead ) ) {
 807                                 return true;
 808                         }
 809
 810                         # Compatibility with old settings
 811                         if( $this->getNamespace() == NS_MAIN ) {
 812                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 813                                         return true;
 814                                 }
 815                         }
 816                 }
 817                 return false;
 818         }
 819
 820         /**
 821          * Is this a .css or .js subpage of a user page?
 822          * @return bool
 823          * @access public
 824          */
 825         function isCssJsSubpage() {
 826                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 827         }
 828         /**
 829          * Is this a .css subpage of a user page?
 830          * @return bool
 831          * @access public
 832          */
 833         function isCssSubpage() {
 834                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 835         }
 836         /**
 837          * Is this a .js subpage of a user page?
 838          * @return bool
 839          * @access public
 840          */
 841         function isJsSubpage() {
 842                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 843         }
 844         /**
 845          * Protect css/js subpages of user pages: can $wgUser edit
 846          * this page?
 847          *
 848          * @return boolean
 849          * @todo XXX: this might be better using restrictions
 850          * @access public
 851          */
 852         function userCanEditCssJsSubpage() {
 853                 global $wgUser;
 854                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 855         }
 856
 857         /**
 858          * Accessor/initialisation for mRestrictions
 859          * @return array the array of groups allowed to edit this article
 860          * @access public
 861          */
 862         function getRestrictions() {
 863                 $id = $this->getArticleID();
 864                 if ( 0 == $id ) { return array(); }
 865
 866                 if ( ! $this->mRestrictionsLoaded ) {
 867                         $dbr =& wfGetDB( DB_SLAVE );
 868                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 869                         $this->mRestrictions = explode( ',', trim( $res ) );
 870                         $this->mRestrictionsLoaded = true;
 871                 }
 872                 return $this->mRestrictions;
 873         }
 874
 875         /**
 876          * Is there a version of this page in the deletion archive?
 877          * @return int the number of archived revisions
 878          * @access public
 879          */
 880         function isDeleted() {
 881                 $fname = 'Title::isDeleted';
 882                 $dbr =& wfGetDB( DB_SLAVE );
 883                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 884                         'ar_title' => $this->getDBkey() ), $fname );
 885                 return (int)$n;
 886         }
 887
 888         /**
 889          * Get the article ID for this Title from the link cache,
 890          * adding it if necessary
 891          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 892          *      for update
 893          * @return int the ID
 894          * @access public
 895          */
 896         function getArticleID( $flags = 0 ) {
 897                 global $wgLinkCache;
 898
 899                 if ( $flags & GAID_FOR_UPDATE ) {
 900                         $oldUpdate = $wgLinkCache->forUpdate( true );
 901                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 902                         $wgLinkCache->forUpdate( $oldUpdate );
 903                 } else {
 904                         if ( -1 == $this->mArticleID ) {
 905                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 906                         }
 907                 }
 908                 return $this->mArticleID;
 909         }
 910
 911         /**
 912          * This clears some fields in this object, and clears any associated
 913          * keys in the "bad links" section of $wgLinkCache.
 914          *
 915          * - This is called from Article::insertNewArticle() to allow
 916          * loading of the new cur_id. It's also called from
 917          * Article::doDeleteArticle()
 918          *
 919          * @param int $newid the new Article ID
 920          * @access public
 921          */
 922         function resetArticleID( $newid ) {
 923                 global $wgLinkCache;
 924                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 925
 926                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 927                 else { $this->mArticleID = $newid; }
 928                 $this->mRestrictionsLoaded = false;
 929                 $this->mRestrictions = array();
 930         }
 931
 932         /**
 933          * Updates cur_touched for this page; called from LinksUpdate.php
 934          * @return bool true if the update succeded
 935          * @access public
 936          */
 937         function invalidateCache() {
 938                 $now = wfTimestampNow();
 939                 $dbw =& wfGetDB( DB_MASTER );
 940                 $success = $dbw->update( 'cur',
 941                         array( /* SET */
 942                                 'cur_touched' => $dbw->timestamp()
 943                         ), array( /* WHERE */
 944                                 'cur_namespace' => $this->getNamespace() ,
 945                                 'cur_title' => $this->getDBkey()
 946                         ), 'Title::invalidateCache'
 947                 );
 948                 return $success;
 949         }
 950
 951         /**
 952          * Prefix some arbitrary text with the namespace or interwiki prefix
 953          * of this object
 954          *
 955          * @param string $name the text
 956          * @return string the prefixed text
 957          * @access private
 958          */
 959         /* private */ function prefix( $name ) {
 960                 global $wgContLang;
 961
 962                 $p = '';
 963                 if ( '' != $this->mInterwiki ) {
 964                         $p = $this->mInterwiki . ':';
 965                 }
 966                 if ( 0 != $this->mNamespace ) {
 967                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 968                 }
 969                 return $p . $name;
 970         }
 971
 972         /**
 973          * Secure and split - main initialisation function for this object
 974          *
 975          * Assumes that mDbkeyform has been set, and is urldecoded
 976          * and uses underscores, but not otherwise munged.  This function
 977          * removes illegal characters, splits off the interwiki and
 978          * namespace prefixes, sets the other forms, and canonicalizes
 979          * everything.
 980          * @return bool true on success
 981          * @access private
 982          */
 983         /* private */ function secureAndSplit() {
 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( NS_IMAGE ) . ':';
 994                         # % is needed as well
 995                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
 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                         $this->mNamespace = NS_MAIN;
1030                 } else {
1031                         # Namespace or interwiki prefix
1032                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $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                 /**
1085                  * Pages with "/./" or "/../" appearing in the URLs will
1086                  * often be unreachable due to the way web browsers deal
1087                  * with 'relative' URLs. Forbid them explicitly.
1088                  */
1089                 if ( strpos( $r, '.' ) !== false &&
1090                      ( $r === '.' || $r === '..' ||
1091                        strpos( $r, './' ) === 0  ||
1092                        strpos( $r, '../' ) === 0 ||
1093                        strpos( $r, '/./' ) !== false ||
1094                        strpos( $r, '/../' ) !== false ) )
1095                 {
1096                         wfProfileOut( $fname );
1097                         return false;
1098                 }
1099
1100                 # We shouldn't need to query the DB for the size.
1101                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1102                 if ( strlen( $r ) > 255 ) {
1103                         return false;
1104                 }
1105
1106                 /**
1107                  * Normally, all wiki links are forced to have
1108                  * an initial capital letter so [[foo]] and [[Foo]]
1109                  * point to the same place.
1110                  *
1111                  * Don't force it for interwikis, since the other
1112                  * site might be case-sensitive.
1113                  */
1114                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1115                         $t = $wgContLang->ucfirst( $r );
1116                 } else {
1117                         $t = $r;
1118                 }
1119
1120                 # Fill fields
1121                 $this->mDbkeyform = $t;
1122                 $this->mUrlform = wfUrlencode( $t );
1123
1124                 $this->mTextform = str_replace( '_', ' ', $t );
1125
1126                 wfProfileOut( $fname );
1127                 return true;
1128         }
1129
1130         /**
1131          * Get a Title object associated with the talk page of this article
1132          * @return Title the object for the talk page
1133          * @access public
1134          */
1135         function getTalkPage() {
1136                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1137         }
1138
1139         /**
1140          * Get a title object associated with the subject page of this
1141          * talk page
1142          *
1143          * @return Title the object for the subject page
1144          * @access public
1145          */
1146         function getSubjectPage() {
1147                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1148         }
1149
1150         /**
1151          * Get an array of Title objects linking to this Title
1152          * - Also stores the IDs in the link cache.
1153          *
1154          * @param string $options may be FOR UPDATE
1155          * @return array the Title objects linking here
1156          * @access public
1157          */
1158         function getLinksTo( $options = '' ) {
1159                 global $wgLinkCache;
1160                 $id = $this->getArticleID();
1161
1162                 if ( $options ) {
1163                         $db =& wfGetDB( DB_MASTER );
1164                 } else {
1165                         $db =& wfGetDB( DB_SLAVE );
1166                 }
1167                 $cur = $db->tableName( 'cur' );
1168                 $links = $db->tableName( 'links' );
1169
1170                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1171                 $res = $db->query( $sql, 'Title::getLinksTo' );
1172                 $retVal = array();
1173                 if ( $db->numRows( $res ) ) {
1174                         while ( $row = $db->fetchObject( $res ) ) {
1175                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1176                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1177                                         $retVal[] = $titleObj;
1178                                 }
1179                         }
1180                 }
1181                 $db->freeResult( $res );
1182                 return $retVal;
1183         }
1184
1185         /**
1186          * Get an array of Title objects linking to this non-existent title.
1187          * - Also stores the IDs in the link cache.
1188          *
1189          * @param string $options may be FOR UPDATE
1190          * @return array the Title objects linking here
1191          * @access public
1192          */
1193         function getBrokenLinksTo( $options = '' ) {
1194                 global $wgLinkCache;
1195
1196                 if ( $options ) {
1197                         $db =& wfGetDB( DB_MASTER );
1198                 } else {
1199                         $db =& wfGetDB( DB_SLAVE );
1200                 }
1201                 $cur = $db->tableName( 'cur' );
1202                 $brokenlinks = $db->tableName( 'brokenlinks' );
1203                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1204
1205                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1206                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1207                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1208                 $retVal = array();
1209                 if ( $db->numRows( $res ) ) {
1210                         while ( $row = $db->fetchObject( $res ) ) {
1211                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1212                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1213                                 $retVal[] = $titleObj;
1214                         }
1215                 }
1216                 $db->freeResult( $res );
1217                 return $retVal;
1218         }
1219
1220         /**
1221          * Get a list of URLs to purge from the Squid cache when this
1222          * page changes
1223          *
1224          * @return array the URLs
1225          * @access public
1226          */
1227         function getSquidURLs() {
1228                 return array(
1229                         $this->getInternalURL(),
1230                         $this->getInternalURL( 'action=history' )
1231                 );
1232         }
1233
1234         /**
1235          * Move this page without authentication
1236          * @param Title &$nt the new page Title
1237          * @access public
1238          */
1239         function moveNoAuth( &$nt ) {
1240                 return $this->moveTo( $nt, false );
1241         }
1242
1243         /**
1244          * Move a title to a new location
1245          * @param Title &$nt the new title
1246          * @param bool $auth indicates whether $wgUser's permissions
1247          *      should be checked
1248          * @return mixed true on success, message name on failure
1249          * @access public
1250          */
1251         function moveTo( &$nt, $auth = true ) {
1252                 if( !$this or !$nt ) {
1253                         return 'badtitletext';
1254                 }
1255
1256                 $fname = 'Title::move';
1257                 $oldid = $this->getArticleID();
1258                 $newid = $nt->getArticleID();
1259
1260                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1261                         return 'articleexists';
1262                 }
1263                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1264                          ( '' == $this->getDBkey() ) ||
1265                          ( '' != $this->getInterwiki() ) ||
1266                          ( !$oldid ) ||
1267                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1268                          ( '' == $nt->getDBkey() ) ||
1269                          ( '' != $nt->getInterwiki() ) ) {
1270                         return 'badarticleerror';
1271                 }
1272
1273                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1274                         return 'protectedpage';
1275                 }
1276
1277                 # The move is allowed only if (1) the target doesn't exist, or
1278                 # (2) the target is a redirect to the source, and has no history
1279                 # (so we can undo bad moves right after they're done).
1280
1281                 if ( 0 != $newid ) { # Target exists; check for validity
1282                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1283                                 return 'articleexists';
1284                         }
1285                         $this->moveOverExistingRedirect( $nt );
1286                 } else { # Target didn't exist, do normal move.
1287                         $this->moveToNewTitle( $nt, $newid );
1288                 }
1289
1290                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1291
1292                 $dbw =& wfGetDB( DB_MASTER );
1293                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1294                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1295                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1296                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1297
1298                 # Update watchlists
1299
1300                 $oldnamespace = $this->getNamespace() & ~1;
1301                 $newnamespace = $nt->getNamespace() & ~1;
1302                 $oldtitle = $this->getDBkey();
1303                 $newtitle = $nt->getDBkey();
1304
1305                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1306                         WatchedItem::duplicateEntries( $this, $nt );
1307                 }
1308
1309                 # Update search engine
1310                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1311                 $u->doUpdate();
1312                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1313                 $u->doUpdate();
1314
1315                 return true;
1316         }
1317
1318         /**
1319          * Move page to a title which is at present a redirect to the
1320          * source page
1321          *
1322          * @param Title &$nt the page to move to, which should currently
1323          *      be a redirect
1324          * @access private
1325          */
1326         /* private */ function moveOverExistingRedirect( &$nt ) {
1327                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1328                 $fname = 'Title::moveOverExistingRedirect';
1329                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1330
1331                 $now = wfTimestampNow();
1332                 $won = wfInvertTimestamp( $now );
1333                 $newid = $nt->getArticleID();
1334                 $oldid = $this->getArticleID();
1335                 $dbw =& wfGetDB( DB_MASTER );
1336                 $links = $dbw->tableName( 'links' );
1337
1338                 # Change the name of the target page:
1339                 $dbw->update( 'cur',
1340                         /* SET */ array(
1341                                 'cur_touched' => $dbw->timestamp($now),
1342                                 'cur_namespace' => $nt->getNamespace(),
1343                                 'cur_title' => $nt->getDBkey()
1344                         ),
1345                         /* WHERE */ array( 'cur_id' => $oldid ),
1346                         $fname
1347                 );
1348                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1349
1350                 # Repurpose the old redirect. We don't save it to history since
1351                 # by definition if we've got here it's rather uninteresting.
1352
1353                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1354                 $dbw->update( 'cur',
1355                         /* SET */ array(
1356                                 'cur_touched' => $dbw->timestamp($now),
1357                                 'cur_timestamp' => $dbw->timestamp($now),
1358                                 'inverse_timestamp' => $won,
1359                                 'cur_namespace' => $this->getNamespace(),
1360                                 'cur_title' => $this->getDBkey(),
1361                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1362                                 'cur_comment' => $comment,
1363                                 'cur_user' => $wgUser->getID(),
1364                                 'cur_minor_edit' => 0,
1365                                 'cur_counter' => 0,
1366                                 'cur_restrictions' => '',
1367                                 'cur_user_text' => $wgUser->getName(),
1368                                 'cur_is_redirect' => 1,
1369                                 'cur_is_new' => 1
1370                         ),
1371                         /* WHERE */ array( 'cur_id' => $newid ),
1372                         $fname
1373                 );
1374
1375                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1376
1377                 # Fix the redundant names for the past revisions of the target page.
1378                 # The redirect should have no old revisions.
1379                 $dbw->update(
1380                         /* table */ 'old',
1381                         /* SET */ array(
1382                                 'old_namespace' => $nt->getNamespace(),
1383                                 'old_title' => $nt->getDBkey(),
1384                         ),
1385                         /* WHERE */ array(
1386                                 'old_namespace' => $this->getNamespace(),
1387                                 'old_title' => $this->getDBkey(),
1388                         ),
1389                         $fname
1390                 );
1391
1392                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1393
1394                 # Swap links
1395
1396                 # Load titles and IDs
1397                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1398                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1399
1400                 # Delete them all
1401                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1402                 $dbw->query( $sql, $fname );
1403
1404                 # Reinsert
1405                 if ( count( $linksToOld ) || count( $linksToNew )) {
1406                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1407                         $first = true;
1408
1409                         # Insert links to old title
1410                         foreach ( $linksToOld as $linkTitle ) {
1411                                 if ( $first ) {
1412                                         $first = false;
1413                                 } else {
1414                                         $sql .= ',';
1415                                 }
1416                                 $id = $linkTitle->getArticleID();
1417                                 $sql .= "($id,$newid)";
1418                         }
1419
1420                         # Insert links to new title
1421                         foreach ( $linksToNew as $linkTitle ) {
1422                                 if ( $first ) {
1423                                         $first = false;
1424                                 } else {
1425                                         $sql .= ',';
1426                                 }
1427                                 $id = $linkTitle->getArticleID();
1428                                 $sql .= "($id, $oldid)";
1429                         }
1430
1431                         $dbw->query( $sql, DB_MASTER, $fname );
1432                 }
1433
1434                 # Now, we record the link from the redirect to the new title.
1435                 # It should have no other outgoing links...
1436                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1437                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1438
1439                 # Clear linkscc
1440                 LinkCache::linksccClearLinksTo( $oldid );
1441                 LinkCache::linksccClearLinksTo( $newid );
1442
1443                 # Purge squid
1444                 if ( $wgUseSquid ) {
1445                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1446                         $u = new SquidUpdate( $urls );
1447                         $u->doUpdate();
1448                 }
1449         }
1450
1451         /**
1452          * Move page to non-existing title.
1453          * @param Title &$nt the new Title
1454          * @param int &$newid set to be the new article ID
1455          * @access private
1456          */
1457         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1458                 global $wgUser, $wgLinkCache, $wgUseSquid;
1459                 $fname = 'MovePageForm::moveToNewTitle';
1460                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1461
1462                 $newid = $nt->getArticleID();
1463                 $oldid = $this->getArticleID();
1464                 $dbw =& wfGetDB( DB_MASTER );
1465                 $now = $dbw->timestamp();
1466                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1467                 wfSeedRandom();
1468                 $rand = wfRandom();
1469
1470                 # Rename cur entry
1471                 $dbw->update( 'cur',
1472                         /* SET */ array(
1473                                 'cur_touched' => $now,
1474                                 'cur_namespace' => $nt->getNamespace(),
1475                                 'cur_title' => $nt->getDBkey()
1476                         ),
1477                         /* WHERE */ array( 'cur_id' => $oldid ),
1478                         $fname
1479                 );
1480
1481                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1482
1483                 # Insert redirect
1484                 $dbw->insert( 'cur', array(
1485                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1486                         'cur_namespace' => $this->getNamespace(),
1487                         'cur_title' => $this->getDBkey(),
1488                         'cur_comment' => $comment,
1489                         'cur_user' => $wgUser->getID(),
1490                         'cur_user_text' => $wgUser->getName(),
1491                         'cur_timestamp' => $now,
1492                         'inverse_timestamp' => $won,
1493                         'cur_touched' => $now,
1494                         'cur_is_redirect' => 1,
1495                         'cur_random' => $rand,
1496                         'cur_is_new' => 1,
1497                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1498                 );
1499                 $newid = $dbw->insertId();
1500                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1501
1502                 # Rename old entries
1503                 $dbw->update(
1504                         /* table */ 'old',
1505                         /* SET */ array(
1506                                 'old_namespace' => $nt->getNamespace(),
1507                                 'old_title' => $nt->getDBkey()
1508                         ),
1509                         /* WHERE */ array(
1510                                 'old_namespace' => $this->getNamespace(),
1511                                 'old_title' => $this->getDBkey()
1512                         ), $fname
1513                 );
1514
1515                 # Record in RC
1516                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1517
1518                 # Purge squid and linkscc as per article creation
1519                 Article::onArticleCreate( $nt );
1520
1521                 # Any text links to the old title must be reassigned to the redirect
1522                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1523                 LinkCache::linksccClearLinksTo( $oldid );
1524
1525                 # Record the just-created redirect's linking to the page
1526                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1527
1528                 # Non-existent target may have had broken links to it; these must
1529                 # now be removed and made into good links.
1530                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1531                 $update->fixBrokenLinks();
1532
1533                 # Purge old title from squid
1534                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1535                 $titles = $nt->getLinksTo();
1536                 if ( $wgUseSquid ) {
1537                         $urls = $this->getSquidURLs();
1538                         foreach ( $titles as $linkTitle ) {
1539                                 $urls[] = $linkTitle->getInternalURL();
1540                         }
1541                         $u = new SquidUpdate( $urls );
1542                         $u->doUpdate();
1543                 }
1544         }
1545
1546         /**
1547          * Checks if $this can be moved to a given Title
1548          * - Selects for update, so don't call it unless you mean business
1549          *
1550          * @param Title &$nt the new title to check
1551          * @access public
1552          */
1553         function isValidMoveTarget( $nt ) {
1554                 $fname = 'Title::isValidMoveTarget';
1555                 $dbw =& wfGetDB( DB_MASTER );
1556
1557                 # Is it a redirect?
1558                 $id  = $nt->getArticleID();
1559                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1560                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1561
1562                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1563                         # Not a redirect
1564                         return false;
1565                 }
1566
1567                 # Does the redirect point to the source?
1568                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1569                         $redirTitle = Title::newFromText( $m[1] );
1570                         if( !is_object( $redirTitle ) ||
1571                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1572                                 return false;
1573                         }
1574                 }
1575
1576                 # Does the article have a history?
1577                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1578                         array(
1579                                 'old_namespace' => $nt->getNamespace(),
1580                                 'old_title' => $nt->getDBkey()
1581                         ), $fname, 'FOR UPDATE'
1582                 );
1583
1584                 # Return true if there was no history
1585                 return $row === false;
1586         }
1587
1588         /**
1589          * Create a redirect; fails if the title already exists; does
1590          * not notify RC
1591          *
1592          * @param Title $dest the destination of the redirect
1593          * @param string $comment the comment string describing the move
1594          * @return bool true on success
1595          * @access public
1596          */
1597         function createRedirect( $dest, $comment ) {
1598                 global $wgUser;
1599                 if ( $this->getArticleID() ) {
1600                         return false;
1601                 }
1602
1603                 $fname = 'Title::createRedirect';
1604                 $dbw =& wfGetDB( DB_MASTER );
1605                 $now = wfTimestampNow();
1606                 $won = wfInvertTimestamp( $now );
1607                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1608
1609                 $dbw->insert( 'cur', array(
1610                         'cur_id' => $seqVal,
1611                         'cur_namespace' => $this->getNamespace(),
1612                         'cur_title' => $this->getDBkey(),
1613                         'cur_comment' => $comment,
1614                         'cur_user' => $wgUser->getID(),
1615                         'cur_user_text' => $wgUser->getName(),
1616                         'cur_timestamp' => $now,
1617                         'inverse_timestamp' => $won,
1618                         'cur_touched' => $now,
1619                         'cur_is_redirect' => 1,
1620                         'cur_is_new' => 1,
1621                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1622                 ), $fname );
1623                 $newid = $dbw->insertId();
1624                 $this->resetArticleID( $newid );
1625
1626                 # Link table
1627                 if ( $dest->getArticleID() ) {
1628                         $dbw->insert( 'links',
1629                                 array(
1630                                         'l_to' => $dest->getArticleID(),
1631                                         'l_from' => $newid
1632                                 ), $fname
1633                         );
1634                 } else {
1635                         $dbw->insert( 'brokenlinks',
1636                                 array(
1637                                         'bl_to' => $dest->getPrefixedDBkey(),
1638                                         'bl_from' => $newid
1639                                 ), $fname
1640                         );
1641                 }
1642
1643                 Article::onArticleCreate( $this );
1644                 return true;
1645         }
1646
1647         /**
1648          * Get categories to which this Title belongs and return an array of
1649          * categories' names.
1650          *
1651          * @return array an array of parents in the form:
1652          *      $parent => $currentarticle
1653          * @access public
1654          */
1655         function getParentCategories() {
1656                 global $wgContLang,$wgUser;
1657
1658                 $titlekey = $this->getArticleId();
1659                 $sk =& $wgUser->getSkin();
1660                 $parents = array();
1661                 $dbr =& wfGetDB( DB_SLAVE );
1662                 $categorylinks = $dbr->tableName( 'categorylinks' );
1663
1664                 # NEW SQL
1665                 $sql = "SELECT * FROM $categorylinks"
1666                      ." WHERE cl_from='$titlekey'"
1667                          ." AND cl_from <> '0'"
1668                          ." ORDER BY cl_sortkey";
1669
1670                 $res = $dbr->query ( $sql ) ;
1671
1672                 if($dbr->numRows($res) > 0) {
1673                         while ( $x = $dbr->fetchObject ( $res ) )
1674                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1675                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1676                         $dbr->freeResult ( $res ) ;
1677                 } else {
1678                         $data = '';
1679                 }
1680                 return $data;
1681         }
1682
1683         /**
1684          * Get a tree of parent categories
1685          * @param array $children an array with the children in the keys, to check for circular refs
1686          * @return array
1687          * @access public
1688          */
1689         function getParentCategoryTree( $children = array() ) {
1690                 $parents = $this->getParentCategories();
1691
1692                 if($parents != '') {
1693                         foreach($parents as $parent => $current)
1694                         {
1695                                 if ( array_key_exists( $parent, $children ) ) {
1696                                         # Circular reference
1697                                         $stack[$parent] = array();
1698                                 } else {
1699                                         $nt = Title::newFromText($parent);
1700                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1701                                 }
1702                         }
1703                         return $stack;
1704                 } else {
1705                         return array();
1706                 }
1707         }
1708
1709
1710         /**
1711          * Get an associative array for selecting this title from
1712          * the "cur" table
1713          *
1714          * @return array
1715          * @access public
1716          */
1717         function curCond() {
1718                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1719         }
1720
1721         /**
1722          * Get an associative array for selecting this title from the
1723          * "old" table
1724          *
1725          * @return array
1726          * @access public
1727          */
1728         function oldCond() {
1729                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1730         }
1731
1732         /**
1733          * Get the revision ID of the previous revision
1734          *
1735          * @param integer $revision  Revision ID. Get the revision that was before this one.
1736          * @return interger $oldrevision|false
1737          */
1738         function getPreviousRevisionID( $revision ) {
1739                 $dbr =& wfGetDB( DB_SLAVE );
1740                 return $dbr->selectField( 'old', 'old_id',
1741                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1742                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1743                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1744         }
1745
1746         /**
1747          * Get the revision ID of the next revision
1748          *
1749          * @param integer $revision  Revision ID. Get the revision that was after this one.
1750          * @return interger $oldrevision|false
1751          */
1752         function getNextRevisionID( $revision ) {
1753                 $dbr =& wfGetDB( DB_SLAVE );
1754                 return $dbr->selectField( 'old', 'old_id',
1755                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1756                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1757                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1758         }
1759
1760 }
1761 ?>