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          * @param string $what the action the page is protected from,
 706          *      by default checks move and edit
 707          * @return boolean
 708          * @access public
 709          */
 710         function isProtected($action = '') {
 711                 if ( -1 == $this->mNamespace ) { return true; }
 712                 if($action == 'edit' || $action == '') {
 713                         $a = $this->getRestrictions("edit");
 714                         if ( in_array( 'sysop', $a ) ) { return true; }
 715                 }
 716                 if($action == 'move' || $action == '') {
 717                         $a = $this->getRestrictions("move");
 718                         if ( in_array( 'sysop', $a ) ) { return true; }
 719                 }
 720                 return false;
 721         }
 722
 723         /**
 724          * Is $wgUser is watching this page?
 725          * @return boolean
 726          * @access public
 727          */
 728         function userIsWatching() {
 729                 global $wgUser;
 730
 731                 if ( -1 == $this->mNamespace ) { return false; }
 732                 if ( 0 == $wgUser->getID() ) { return false; }
 733
 734                 return $wgUser->isWatched( $this );
 735         }
 736
 737         /**
 738          * Is $wgUser perform $action this page?
 739          * @param string $action action that permission needs to be checked for
 740          * @return boolean
 741          * @access private
 742          */
 743         function userCan($action) {
 744                 $fname = 'Title::userCanEdit';
 745                 wfProfileIn( $fname );
 746
 747                 global $wgUser;
 748                 if( NS_SPECIAL == $this->mNamespace ) {
 749                         wfProfileOut( $fname );
 750                         return false;
 751                 }
 752                 if( NS_MEDIAWIKI == $this->mNamespace &&
 753                     !$wgUser->isAllowed('editinterface') ) {
 754                         wfProfileOut( $fname );
 755                         return false;
 756                 }
 757                 if( $this->mDbkeyform == '_' ) {
 758                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 759                         wfProfileOut( $fname );
 760                         return false;
 761                 }
 762
 763                 # protect global styles and js
 764                 if ( NS_MEDIAWIKI == $this->mNamespace
 765                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 766                      && !$wgUser->isAllowed('editinterface') ) {
 767                         wfProfileOut( $fname );
 768                         return false;
 769                 }
 770
 771                 # protect css/js subpages of user pages
 772                 # XXX: this might be better using restrictions
 773                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 774                 if( NS_USER == $this->mNamespace
 775                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 776                         && !$wgUser->isAllowed('editinterface')
 777                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 778                         wfProfileOut( $fname );
 779                         return false;
 780                 }
 781
 782                 foreach( $this->getRestrictions($action) as $right ) {
 783                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 784                                 wfProfileOut( $fname );
 785                                 return false;
 786                         }
 787                 }
 788                 wfProfileOut( $fname );
 789                 return true;
 790         }
 791
 792         /**
 793          * Can $wgUser edit this page?
 794          * @return boolean
 795          * @access public
 796          */
 797         function userCanEdit() {
 798                 return $this->userCan('edit');
 799         }
 800
 801         /**
 802          * Can $wgUser move this page?
 803          * @return boolean
 804          * @access public
 805          */
 806         function userCanMove() {
 807                 return $this->userCan('move');
 808         }
 809
 810         /**
 811          * Can $wgUser read this page?
 812          * @return boolean
 813          * @access public
 814          */
 815         function userCanRead() {
 816                 global $wgUser;
 817
 818                 if( $wgUser->isAllowed('read') ) {
 819                         return true;
 820                 } else {
 821                         global $wgWhitelistRead;
 822
 823                         /** If anon users can create an account,
 824                             they need to reach the login page first! */
 825                         if( $wgUser->isAllowed( 'createaccount' )
 826                             && $this->mId == NS_SPECIAL
 827                             && $this->getText() == 'Userlogin' ) {
 828                                 return true;
 829                         }
 830
 831                         /** some pages are explicitly allowed */
 832                         $name = $this->getPrefixedText();
 833                         if( in_array( $name, $wgWhitelistRead ) ) {
 834                                 return true;
 835                         }
 836
 837                         # Compatibility with old settings
 838                         if( $this->getNamespace() == NS_MAIN ) {
 839                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 840                                         return true;
 841                                 }
 842                         }
 843                 }
 844                 return false;
 845         }
 846
 847         /**
 848          * Is this a .css or .js subpage of a user page?
 849          * @return bool
 850          * @access public
 851          */
 852         function isCssJsSubpage() {
 853                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 854         }
 855         /**
 856          * Is this a .css subpage of a user page?
 857          * @return bool
 858          * @access public
 859          */
 860         function isCssSubpage() {
 861                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 862         }
 863         /**
 864          * Is this a .js subpage of a user page?
 865          * @return bool
 866          * @access public
 867          */
 868         function isJsSubpage() {
 869                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 870         }
 871         /**
 872          * Protect css/js subpages of user pages: can $wgUser edit
 873          * this page?
 874          *
 875          * @return boolean
 876          * @todo XXX: this might be better using restrictions
 877          * @access public
 878          */
 879         function userCanEditCssJsSubpage() {
 880                 global $wgUser;
 881                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 882         }
 883
 884         /**
 885          * Loads a string into mRestrictions array
 886          * @param string $res restrictions in string format
 887          * @access public
 888          */
 889         function loadRestrictions( $res ) {
 890                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 891                         $temp = explode( '=', trim( $restrict ) );
 892                         if(count($temp) == 1) {
 893                                 // old format should be treated as edit/move restriction
 894                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
 895                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
 896                         } else {
 897                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 898                         }
 899                 }
 900                 $this->mRestrictionsLoaded = true;
 901         }
 902
 903         /**
 904          * Accessor/initialisation for mRestrictions
 905          * @param string $action action that permission needs to be checked for
 906          * @return array the array of groups allowed to edit this article
 907          * @access public
 908          */
 909         function getRestrictions($action) {
 910                 $id = $this->getArticleID();
 911                 if ( 0 == $id ) { return array(); }
 912
 913                 if ( ! $this->mRestrictionsLoaded ) {
 914                         $dbr =& wfGetDB( DB_SLAVE );
 915                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 916                         $this->loadRestrictions( $res );
 917                 }
 918                 $result = $this->mRestrictions[$action];
 919                 return $result ? $result : array();
 920         }
 921
 922         /**
 923          * Is there a version of this page in the deletion archive?
 924          * @return int the number of archived revisions
 925          * @access public
 926          */
 927         function isDeleted() {
 928                 $fname = 'Title::isDeleted';
 929                 $dbr =& wfGetDB( DB_SLAVE );
 930                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 931                         'ar_title' => $this->getDBkey() ), $fname );
 932                 return (int)$n;
 933         }
 934
 935         /**
 936          * Get the article ID for this Title from the link cache,
 937          * adding it if necessary
 938          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 939          *      for update
 940          * @return int the ID
 941          * @access public
 942          */
 943         function getArticleID( $flags = 0 ) {
 944                 global $wgLinkCache;
 945
 946                 if ( $flags & GAID_FOR_UPDATE ) {
 947                         $oldUpdate = $wgLinkCache->forUpdate( true );
 948                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 949                         $wgLinkCache->forUpdate( $oldUpdate );
 950                 } else {
 951                         if ( -1 == $this->mArticleID ) {
 952                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 953                         }
 954                 }
 955                 return $this->mArticleID;
 956         }
 957
 958         /**
 959          * This clears some fields in this object, and clears any associated
 960          * keys in the "bad links" section of $wgLinkCache.
 961          *
 962          * - This is called from Article::insertNewArticle() to allow
 963          * loading of the new cur_id. It's also called from
 964          * Article::doDeleteArticle()
 965          *
 966          * @param int $newid the new Article ID
 967          * @access public
 968          */
 969         function resetArticleID( $newid ) {
 970                 global $wgLinkCache;
 971                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 972
 973                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 974                 else { $this->mArticleID = $newid; }
 975                 $this->mRestrictionsLoaded = false;
 976                 $this->mRestrictions = array();
 977         }
 978
 979         /**
 980          * Updates cur_touched for this page; called from LinksUpdate.php
 981          * @return bool true if the update succeded
 982          * @access public
 983          */
 984         function invalidateCache() {
 985                 $now = wfTimestampNow();
 986                 $dbw =& wfGetDB( DB_MASTER );
 987                 $success = $dbw->update( 'cur',
 988                         array( /* SET */
 989                                 'cur_touched' => $dbw->timestamp()
 990                         ), array( /* WHERE */
 991                                 'cur_namespace' => $this->getNamespace() ,
 992                                 'cur_title' => $this->getDBkey()
 993                         ), 'Title::invalidateCache'
 994                 );
 995                 return $success;
 996         }
 997
 998         /**
 999          * Prefix some arbitrary text with the namespace or interwiki prefix
1000          * of this object
1001          *
1002          * @param string $name the text
1003          * @return string the prefixed text
1004          * @access private
1005          */
1006         /* private */ function prefix( $name ) {
1007                 global $wgContLang;
1008
1009                 $p = '';
1010                 if ( '' != $this->mInterwiki ) {
1011                         $p = $this->mInterwiki . ':';
1012                 }
1013                 if ( 0 != $this->mNamespace ) {
1014                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1015                 }
1016                 return $p . $name;
1017         }
1018
1019         /**
1020          * Secure and split - main initialisation function for this object
1021          *
1022          * Assumes that mDbkeyform has been set, and is urldecoded
1023          * and uses underscores, but not otherwise munged.  This function
1024          * removes illegal characters, splits off the interwiki and
1025          * namespace prefixes, sets the other forms, and canonicalizes
1026          * everything.
1027          * @return bool true on success
1028          * @access private
1029          */
1030         /* private */ function secureAndSplit() {
1031                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1032                 $fname = 'Title::secureAndSplit';
1033                 wfProfileIn( $fname );
1034
1035                 static $imgpre = false;
1036                 static $rxTc = false;
1037
1038                 # Initialisation
1039                 if ( $imgpre === false ) {
1040                         $imgpre = ':' . $wgContLang->getNsText( NS_IMAGE ) . ':';
1041                         # % is needed as well
1042                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1043                 }
1044
1045                 $this->mInterwiki = $this->mFragment = '';
1046                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1047
1048                 # Clean up whitespace
1049                 #
1050                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
1051                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
1052
1053                 if ( '' == $t ) {
1054                         wfProfileOut( $fname );
1055                         return false;
1056                 }
1057
1058                 global $wgUseLatin1;
1059                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1060                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1061                         wfProfileOut( $fname );
1062                         return false;
1063                 }
1064
1065                 $this->mDbkeyform = $t;
1066                 $done = false;
1067
1068                 # :Image: namespace
1069                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1070                         $t = substr( $t, 1 );
1071                 }
1072
1073                 # Initial colon indicating main namespace
1074                 if ( ':' == $t{0} ) {
1075                         $r = substr( $t, 1 );
1076                         $this->mNamespace = NS_MAIN;
1077                 } else {
1078                         # Namespace or interwiki prefix
1079                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1080                                 #$p = strtolower( $m[1] );
1081                                 $p = $m[1];
1082                                 $lowerNs = strtolower( $p );
1083                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1084                                         # Canonical namespace
1085                                         $t = $m[2];
1086                                         $this->mNamespace = $ns;
1087                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1088                                         # Ordinary namespace
1089                                         $t = $m[2];
1090                                         $this->mNamespace = $ns;
1091                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1092                                         # Interwiki link
1093                                         $t = $m[2];
1094                                         $this->mInterwiki = $p;
1095
1096                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1097                                                 $done = true;
1098                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1099                                                 $done = true;
1100                                         }
1101                                 }
1102                         }
1103                         $r = $t;
1104                 }
1105
1106                 # Redundant interwiki prefix to the local wiki
1107                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1108                         $this->mInterwiki = '';
1109                 }
1110                 # We already know that some pages won't be in the database!
1111                 #
1112                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1113                         $this->mArticleID = 0;
1114                 }
1115                 $f = strstr( $r, '#' );
1116                 if ( false !== $f ) {
1117                         $this->mFragment = substr( $f, 1 );
1118                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1119                         # remove whitespace again: prevents "Foo_bar_#"
1120                         # becoming "Foo_bar_"
1121                         $r = preg_replace( '/_*$/', '', $r );
1122                 }
1123
1124                 # Reject illegal characters.
1125                 #
1126                 if( preg_match( $rxTc, $r ) ) {
1127                         wfProfileOut( $fname );
1128                         return false;
1129                 }
1130
1131                 /**
1132                  * Pages with "/./" or "/../" appearing in the URLs will
1133                  * often be unreachable due to the way web browsers deal
1134                  * with 'relative' URLs. Forbid them explicitly.
1135                  */
1136                 if ( strpos( $r, '.' ) !== false &&
1137                      ( $r === '.' || $r === '..' ||
1138                        strpos( $r, './' ) === 0  ||
1139                        strpos( $r, '../' ) === 0 ||
1140                        strpos( $r, '/./' ) !== false ||
1141                        strpos( $r, '/../' ) !== false ) )
1142                 {
1143                         wfProfileOut( $fname );
1144                         return false;
1145                 }
1146
1147                 # We shouldn't need to query the DB for the size.
1148                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1149                 if ( strlen( $r ) > 255 ) {
1150                         return false;
1151                 }
1152
1153                 /**
1154                  * Normally, all wiki links are forced to have
1155                  * an initial capital letter so [[foo]] and [[Foo]]
1156                  * point to the same place.
1157                  *
1158                  * Don't force it for interwikis, since the other
1159                  * site might be case-sensitive.
1160                  */
1161                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1162                         $t = $wgContLang->ucfirst( $r );
1163                 } else {
1164                         $t = $r;
1165                 }
1166
1167                 # Fill fields
1168                 $this->mDbkeyform = $t;
1169                 $this->mUrlform = wfUrlencode( $t );
1170
1171                 $this->mTextform = str_replace( '_', ' ', $t );
1172
1173                 wfProfileOut( $fname );
1174                 return true;
1175         }
1176
1177         /**
1178          * Get a Title object associated with the talk page of this article
1179          * @return Title the object for the talk page
1180          * @access public
1181          */
1182         function getTalkPage() {
1183                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1184         }
1185
1186         /**
1187          * Get a title object associated with the subject page of this
1188          * talk page
1189          *
1190          * @return Title the object for the subject page
1191          * @access public
1192          */
1193         function getSubjectPage() {
1194                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1195         }
1196
1197         /**
1198          * Get an array of Title objects linking to this Title
1199          * - Also stores the IDs in the link cache.
1200          *
1201          * @param string $options may be FOR UPDATE
1202          * @return array the Title objects linking here
1203          * @access public
1204          */
1205         function getLinksTo( $options = '' ) {
1206                 global $wgLinkCache;
1207                 $id = $this->getArticleID();
1208
1209                 if ( $options ) {
1210                         $db =& wfGetDB( DB_MASTER );
1211                 } else {
1212                         $db =& wfGetDB( DB_SLAVE );
1213                 }
1214                 $cur = $db->tableName( 'cur' );
1215                 $links = $db->tableName( 'links' );
1216
1217                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1218                 $res = $db->query( $sql, 'Title::getLinksTo' );
1219                 $retVal = array();
1220                 if ( $db->numRows( $res ) ) {
1221                         while ( $row = $db->fetchObject( $res ) ) {
1222                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1223                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1224                                         $retVal[] = $titleObj;
1225                                 }
1226                         }
1227                 }
1228                 $db->freeResult( $res );
1229                 return $retVal;
1230         }
1231
1232         /**
1233          * Get an array of Title objects linking to this non-existent title.
1234          * - Also stores the IDs in the link cache.
1235          *
1236          * @param string $options may be FOR UPDATE
1237          * @return array the Title objects linking here
1238          * @access public
1239          */
1240         function getBrokenLinksTo( $options = '' ) {
1241                 global $wgLinkCache;
1242
1243                 if ( $options ) {
1244                         $db =& wfGetDB( DB_MASTER );
1245                 } else {
1246                         $db =& wfGetDB( DB_SLAVE );
1247                 }
1248                 $cur = $db->tableName( 'cur' );
1249                 $brokenlinks = $db->tableName( 'brokenlinks' );
1250                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1251
1252                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1253                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1254                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1255                 $retVal = array();
1256                 if ( $db->numRows( $res ) ) {
1257                         while ( $row = $db->fetchObject( $res ) ) {
1258                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1259                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1260                                 $retVal[] = $titleObj;
1261                         }
1262                 }
1263                 $db->freeResult( $res );
1264                 return $retVal;
1265         }
1266
1267         /**
1268          * Get a list of URLs to purge from the Squid cache when this
1269          * page changes
1270          *
1271          * @return array the URLs
1272          * @access public
1273          */
1274         function getSquidURLs() {
1275                 return array(
1276                         $this->getInternalURL(),
1277                         $this->getInternalURL( 'action=history' )
1278                 );
1279         }
1280
1281         /**
1282          * Move this page without authentication
1283          * @param Title &$nt the new page Title
1284          * @access public
1285          */
1286         function moveNoAuth( &$nt ) {
1287                 return $this->moveTo( $nt, false );
1288         }
1289
1290         /**
1291          * Move a title to a new location
1292          * @param Title &$nt the new title
1293          * @param bool $auth indicates whether $wgUser's permissions
1294          *      should be checked
1295          * @return mixed true on success, message name on failure
1296          * @access public
1297          */
1298         function moveTo( &$nt, $auth = true ) {
1299                 if( !$this or !$nt ) {
1300                         return 'badtitletext';
1301                 }
1302
1303                 $fname = 'Title::move';
1304                 $oldid = $this->getArticleID();
1305                 $newid = $nt->getArticleID();
1306
1307                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1308                         return 'articleexists';
1309                 }
1310                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1311                          ( '' == $this->getDBkey() ) ||
1312                          ( '' != $this->getInterwiki() ) ||
1313                          ( !$oldid ) ||
1314                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1315                          ( '' == $nt->getDBkey() ) ||
1316                          ( '' != $nt->getInterwiki() ) ) {
1317                         return 'badarticleerror';
1318                 }
1319
1320                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1321                         return 'protectedpage';
1322                 }
1323
1324                 # The move is allowed only if (1) the target doesn't exist, or
1325                 # (2) the target is a redirect to the source, and has no history
1326                 # (so we can undo bad moves right after they're done).
1327
1328                 if ( 0 != $newid ) { # Target exists; check for validity
1329                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1330                                 return 'articleexists';
1331                         }
1332                         $this->moveOverExistingRedirect( $nt );
1333                 } else { # Target didn't exist, do normal move.
1334                         $this->moveToNewTitle( $nt, $newid );
1335                 }
1336
1337                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1338
1339                 $dbw =& wfGetDB( DB_MASTER );
1340                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1341                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1342                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1343                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1344
1345                 # Update watchlists
1346
1347                 $oldnamespace = $this->getNamespace() & ~1;
1348                 $newnamespace = $nt->getNamespace() & ~1;
1349                 $oldtitle = $this->getDBkey();
1350                 $newtitle = $nt->getDBkey();
1351
1352                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1353                         WatchedItem::duplicateEntries( $this, $nt );
1354                 }
1355
1356                 # Update search engine
1357                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1358                 $u->doUpdate();
1359                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1360                 $u->doUpdate();
1361
1362                 return true;
1363         }
1364
1365         /**
1366          * Move page to a title which is at present a redirect to the
1367          * source page
1368          *
1369          * @param Title &$nt the page to move to, which should currently
1370          *      be a redirect
1371          * @access private
1372          */
1373         /* private */ function moveOverExistingRedirect( &$nt ) {
1374                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1375                 $fname = 'Title::moveOverExistingRedirect';
1376                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1377
1378                 $now = wfTimestampNow();
1379                 $won = wfInvertTimestamp( $now );
1380                 $newid = $nt->getArticleID();
1381                 $oldid = $this->getArticleID();
1382                 $dbw =& wfGetDB( DB_MASTER );
1383                 $links = $dbw->tableName( 'links' );
1384
1385                 # Change the name of the target page:
1386                 $dbw->update( 'cur',
1387                         /* SET */ array(
1388                                 'cur_touched' => $dbw->timestamp($now),
1389                                 'cur_namespace' => $nt->getNamespace(),
1390                                 'cur_title' => $nt->getDBkey()
1391                         ),
1392                         /* WHERE */ array( 'cur_id' => $oldid ),
1393                         $fname
1394                 );
1395                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1396
1397                 # Repurpose the old redirect. We don't save it to history since
1398                 # by definition if we've got here it's rather uninteresting.
1399
1400                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1401                 $dbw->update( 'cur',
1402                         /* SET */ array(
1403                                 'cur_touched' => $dbw->timestamp($now),
1404                                 'cur_timestamp' => $dbw->timestamp($now),
1405                                 'inverse_timestamp' => $won,
1406                                 'cur_namespace' => $this->getNamespace(),
1407                                 'cur_title' => $this->getDBkey(),
1408                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1409                                 'cur_comment' => $comment,
1410                                 'cur_user' => $wgUser->getID(),
1411                                 'cur_minor_edit' => 0,
1412                                 'cur_counter' => 0,
1413                                 'cur_restrictions' => '',
1414                                 'cur_user_text' => $wgUser->getName(),
1415                                 'cur_is_redirect' => 1,
1416                                 'cur_is_new' => 1
1417                         ),
1418                         /* WHERE */ array( 'cur_id' => $newid ),
1419                         $fname
1420                 );
1421
1422                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1423
1424                 # Fix the redundant names for the past revisions of the target page.
1425                 # The redirect should have no old revisions.
1426                 $dbw->update(
1427                         /* table */ 'old',
1428                         /* SET */ array(
1429                                 'old_namespace' => $nt->getNamespace(),
1430                                 'old_title' => $nt->getDBkey(),
1431                         ),
1432                         /* WHERE */ array(
1433                                 'old_namespace' => $this->getNamespace(),
1434                                 'old_title' => $this->getDBkey(),
1435                         ),
1436                         $fname
1437                 );
1438
1439                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1440
1441                 # Swap links
1442
1443                 # Load titles and IDs
1444                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1445                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1446
1447                 # Delete them all
1448                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1449                 $dbw->query( $sql, $fname );
1450
1451                 # Reinsert
1452                 if ( count( $linksToOld ) || count( $linksToNew )) {
1453                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1454                         $first = true;
1455
1456                         # Insert links to old title
1457                         foreach ( $linksToOld as $linkTitle ) {
1458                                 if ( $first ) {
1459                                         $first = false;
1460                                 } else {
1461                                         $sql .= ',';
1462                                 }
1463                                 $id = $linkTitle->getArticleID();
1464                                 $sql .= "($id,$newid)";
1465                         }
1466
1467                         # Insert links to new title
1468                         foreach ( $linksToNew as $linkTitle ) {
1469                                 if ( $first ) {
1470                                         $first = false;
1471                                 } else {
1472                                         $sql .= ',';
1473                                 }
1474                                 $id = $linkTitle->getArticleID();
1475                                 $sql .= "($id, $oldid)";
1476                         }
1477
1478                         $dbw->query( $sql, DB_MASTER, $fname );
1479                 }
1480
1481                 # Now, we record the link from the redirect to the new title.
1482                 # It should have no other outgoing links...
1483                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1484                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1485
1486                 # Clear linkscc
1487                 LinkCache::linksccClearLinksTo( $oldid );
1488                 LinkCache::linksccClearLinksTo( $newid );
1489
1490                 # Purge squid
1491                 if ( $wgUseSquid ) {
1492                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1493                         $u = new SquidUpdate( $urls );
1494                         $u->doUpdate();
1495                 }
1496         }
1497
1498         /**
1499          * Move page to non-existing title.
1500          * @param Title &$nt the new Title
1501          * @param int &$newid set to be the new article ID
1502          * @access private
1503          */
1504         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1505                 global $wgUser, $wgLinkCache, $wgUseSquid;
1506                 $fname = 'MovePageForm::moveToNewTitle';
1507                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1508
1509                 $newid = $nt->getArticleID();
1510                 $oldid = $this->getArticleID();
1511                 $dbw =& wfGetDB( DB_MASTER );
1512                 $now = $dbw->timestamp();
1513                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1514                 wfSeedRandom();
1515                 $rand = wfRandom();
1516
1517                 # Rename cur entry
1518                 $dbw->update( 'cur',
1519                         /* SET */ array(
1520                                 'cur_touched' => $now,
1521                                 'cur_namespace' => $nt->getNamespace(),
1522                                 'cur_title' => $nt->getDBkey()
1523                         ),
1524                         /* WHERE */ array( 'cur_id' => $oldid ),
1525                         $fname
1526                 );
1527
1528                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1529
1530                 # Insert redirect
1531                 $dbw->insert( 'cur', array(
1532                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1533                         'cur_namespace' => $this->getNamespace(),
1534                         'cur_title' => $this->getDBkey(),
1535                         'cur_comment' => $comment,
1536                         'cur_user' => $wgUser->getID(),
1537                         'cur_user_text' => $wgUser->getName(),
1538                         'cur_timestamp' => $now,
1539                         'inverse_timestamp' => $won,
1540                         'cur_touched' => $now,
1541                         'cur_is_redirect' => 1,
1542                         'cur_random' => $rand,
1543                         'cur_is_new' => 1,
1544                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1545                 );
1546                 $newid = $dbw->insertId();
1547                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1548
1549                 # Rename old entries
1550                 $dbw->update(
1551                         /* table */ 'old',
1552                         /* SET */ array(
1553                                 'old_namespace' => $nt->getNamespace(),
1554                                 'old_title' => $nt->getDBkey()
1555                         ),
1556                         /* WHERE */ array(
1557                                 'old_namespace' => $this->getNamespace(),
1558                                 'old_title' => $this->getDBkey()
1559                         ), $fname
1560                 );
1561
1562                 # Record in RC
1563                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1564
1565                 # Purge squid and linkscc as per article creation
1566                 Article::onArticleCreate( $nt );
1567
1568                 # Any text links to the old title must be reassigned to the redirect
1569                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1570                 LinkCache::linksccClearLinksTo( $oldid );
1571
1572                 # Record the just-created redirect's linking to the page
1573                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1574
1575                 # Non-existent target may have had broken links to it; these must
1576                 # now be removed and made into good links.
1577                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1578                 $update->fixBrokenLinks();
1579
1580                 # Purge old title from squid
1581                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1582                 $titles = $nt->getLinksTo();
1583                 if ( $wgUseSquid ) {
1584                         $urls = $this->getSquidURLs();
1585                         foreach ( $titles as $linkTitle ) {
1586                                 $urls[] = $linkTitle->getInternalURL();
1587                         }
1588                         $u = new SquidUpdate( $urls );
1589                         $u->doUpdate();
1590                 }
1591         }
1592
1593         /**
1594          * Checks if $this can be moved to a given Title
1595          * - Selects for update, so don't call it unless you mean business
1596          *
1597          * @param Title &$nt the new title to check
1598          * @access public
1599          */
1600         function isValidMoveTarget( $nt ) {
1601                 $fname = 'Title::isValidMoveTarget';
1602                 $dbw =& wfGetDB( DB_MASTER );
1603
1604                 # Is it a redirect?
1605                 $id  = $nt->getArticleID();
1606                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1607                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1608
1609                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1610                         # Not a redirect
1611                         return false;
1612                 }
1613
1614                 # Does the redirect point to the source?
1615                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1616                         $redirTitle = Title::newFromText( $m[1] );
1617                         if( !is_object( $redirTitle ) ||
1618                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1619                                 return false;
1620                         }
1621                 }
1622
1623                 # Does the article have a history?
1624                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1625                         array(
1626                                 'old_namespace' => $nt->getNamespace(),
1627                                 'old_title' => $nt->getDBkey()
1628                         ), $fname, 'FOR UPDATE'
1629                 );
1630
1631                 # Return true if there was no history
1632                 return $row === false;
1633         }
1634
1635         /**
1636          * Create a redirect; fails if the title already exists; does
1637          * not notify RC
1638          *
1639          * @param Title $dest the destination of the redirect
1640          * @param string $comment the comment string describing the move
1641          * @return bool true on success
1642          * @access public
1643          */
1644         function createRedirect( $dest, $comment ) {
1645                 global $wgUser;
1646                 if ( $this->getArticleID() ) {
1647                         return false;
1648                 }
1649
1650                 $fname = 'Title::createRedirect';
1651                 $dbw =& wfGetDB( DB_MASTER );
1652                 $now = wfTimestampNow();
1653                 $won = wfInvertTimestamp( $now );
1654                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1655
1656                 $dbw->insert( 'cur', array(
1657                         'cur_id' => $seqVal,
1658                         'cur_namespace' => $this->getNamespace(),
1659                         'cur_title' => $this->getDBkey(),
1660                         'cur_comment' => $comment,
1661                         'cur_user' => $wgUser->getID(),
1662                         'cur_user_text' => $wgUser->getName(),
1663                         'cur_timestamp' => $now,
1664                         'inverse_timestamp' => $won,
1665                         'cur_touched' => $now,
1666                         'cur_is_redirect' => 1,
1667                         'cur_is_new' => 1,
1668                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1669                 ), $fname );
1670                 $newid = $dbw->insertId();
1671                 $this->resetArticleID( $newid );
1672
1673                 # Link table
1674                 if ( $dest->getArticleID() ) {
1675                         $dbw->insert( 'links',
1676                                 array(
1677                                         'l_to' => $dest->getArticleID(),
1678                                         'l_from' => $newid
1679                                 ), $fname
1680                         );
1681                 } else {
1682                         $dbw->insert( 'brokenlinks',
1683                                 array(
1684                                         'bl_to' => $dest->getPrefixedDBkey(),
1685                                         'bl_from' => $newid
1686                                 ), $fname
1687                         );
1688                 }
1689
1690                 Article::onArticleCreate( $this );
1691                 return true;
1692         }
1693
1694         /**
1695          * Get categories to which this Title belongs and return an array of
1696          * categories' names.
1697          *
1698          * @return array an array of parents in the form:
1699          *      $parent => $currentarticle
1700          * @access public
1701          */
1702         function getParentCategories() {
1703                 global $wgContLang,$wgUser;
1704
1705                 $titlekey = $this->getArticleId();
1706                 $sk =& $wgUser->getSkin();
1707                 $parents = array();
1708                 $dbr =& wfGetDB( DB_SLAVE );
1709                 $categorylinks = $dbr->tableName( 'categorylinks' );
1710
1711                 # NEW SQL
1712                 $sql = "SELECT * FROM $categorylinks"
1713                      ." WHERE cl_from='$titlekey'"
1714                          ." AND cl_from <> '0'"
1715                          ." ORDER BY cl_sortkey";
1716
1717                 $res = $dbr->query ( $sql ) ;
1718
1719                 if($dbr->numRows($res) > 0) {
1720                         while ( $x = $dbr->fetchObject ( $res ) )
1721                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1722                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1723                         $dbr->freeResult ( $res ) ;
1724                 } else {
1725                         $data = '';
1726                 }
1727                 return $data;
1728         }
1729
1730         /**
1731          * Get a tree of parent categories
1732          * @param array $children an array with the children in the keys, to check for circular refs
1733          * @return array
1734          * @access public
1735          */
1736         function getParentCategoryTree( $children = array() ) {
1737                 $parents = $this->getParentCategories();
1738
1739                 if($parents != '') {
1740                         foreach($parents as $parent => $current)
1741                         {
1742                                 if ( array_key_exists( $parent, $children ) ) {
1743                                         # Circular reference
1744                                         $stack[$parent] = array();
1745                                 } else {
1746                                         $nt = Title::newFromText($parent);
1747                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1748                                 }
1749                         }
1750                         return $stack;
1751                 } else {
1752                         return array();
1753                 }
1754         }
1755
1756
1757         /**
1758          * Get an associative array for selecting this title from
1759          * the "cur" table
1760          *
1761          * @return array
1762          * @access public
1763          */
1764         function curCond() {
1765                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1766         }
1767
1768         /**
1769          * Get an associative array for selecting this title from the
1770          * "old" table
1771          *
1772          * @return array
1773          * @access public
1774          */
1775         function oldCond() {
1776                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1777         }
1778
1779         /**
1780          * Get the revision ID of the previous revision
1781          *
1782          * @param integer $revision  Revision ID. Get the revision that was before this one.
1783          * @return interger $oldrevision|false
1784          */
1785         function getPreviousRevisionID( $revision ) {
1786                 $dbr =& wfGetDB( DB_SLAVE );
1787                 return $dbr->selectField( 'old', 'old_id',
1788                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1789                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1790                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1791         }
1792
1793         /**
1794          * Get the revision ID of the next revision
1795          *
1796          * @param integer $revision  Revision ID. Get the revision that was after this one.
1797          * @return interger $oldrevision|false
1798          */
1799         function getNextRevisionID( $revision ) {
1800                 $dbr =& wfGetDB( DB_SLAVE );
1801                 return $dbr->selectField( 'old', 'old_id',
1802                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1803                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1804                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1805         }
1806
1807 }
1808 ?>