includes/Title.php

   1 <?php
   2 # See title.doc
   3
   4 $wgTitleInterwikiCache = array();
   5
   6 # Title class
   7 #
   8 # * Represents a title, which may contain an interwiki designation or namespace
   9 # * Can fetch various kinds of data from the database, albeit inefficiently.
  10 #
  11 class Title {
  12         # All member variables should be considered private
  13         # Please use the accessor functions
  14
  15         var $mTextform;           # Text form (spaces not underscores) of the main part
  16         var $mUrlform;            # URL-encoded form of the main part
  17         var $mDbkeyform;          # Main part with underscores
  18         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  19         var $mInterwiki;          # Interwiki prefix (or null string)
  20         var $mFragment;           # Title fragment (i.e. the bit after the #)
  21         var $mArticleID;          # Article ID, fetched from the link cache on demand
  22         var $mRestrictions;       # Array of groups allowed to edit this article
  23                               # Only null or "sysop" are supported
  24         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  25         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  26         var $mDefaultNamespace;   # Namespace index when there is no namespace
  27                               # Zero except in {{transclusion}} tags
  28
  29 #----------------------------------------------------------------------------
  30 #   Construction
  31 #----------------------------------------------------------------------------
  32
  33         /* private */ function Title()
  34         {
  35                 $this->mInterwiki = $this->mUrlform =
  36                 $this->mTextform = $this->mDbkeyform = "";
  37                 $this->mArticleID = -1;
  38                 $this->mNamespace = 0;
  39                 $this->mRestrictionsLoaded = false;
  40                 $this->mRestrictions = array();
  41                 $this->mDefaultNamespace = 0;
  42         }
  43
  44         # From a prefixed DB key
  45         /* static */ function newFromDBkey( $key )
  46         {
  47                 $t = new Title();
  48                 $t->mDbkeyform = $key;
  49                 if( $t->secureAndSplit() )
  50                         return $t;
  51                 else
  52                         return NULL;
  53         }
  54
  55         # From text, such as what you would find in a link
  56         /* static */ function newFromText( $text, $defaultNamespace = 0 )
  57         {
  58                 $fname = "Title::newFromText";
  59                 wfProfileIn( $fname );
  60
  61                 if( is_object( $text ) ) {
  62                         wfDebugDieBacktrace( "Called with object instead of string." );
  63                 }
  64                 global $wgInputEncoding;
  65                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
  66
  67                 $text = wfMungeToUtf8( $text );
  68
  69
  70                 # What was this for? TS 2004-03-03
  71                 # $text = urldecode( $text );
  72
  73                 $t = new Title();
  74                 $t->mDbkeyform = str_replace( " ", "_", $text );
  75                 $t->mDefaultNamespace = $defaultNamespace;
  76
  77                 wfProfileOut( $fname );
  78                 if ( !is_object( $t ) ) {
  79                         var_dump( debug_backtrace() );
  80                 }
  81                 if( $t->secureAndSplit() ) {
  82                         return $t;
  83                 } else {
  84                         return NULL;
  85                 }
  86         }
  87
  88         # From a URL-encoded title
  89         /* static */ function newFromURL( $url )
  90         {
  91                 global $wgLang, $wgServer;
  92                 $t = new Title();
  93                 $s = urldecode( $url ); # This is technically wrong, as anything
  94                                                                 # we've gotten is already decoded by PHP.
  95                                                                 # Kept for backwards compatibility with
  96                                                                 # buggy URLs we had for a while...
  97                 $s = $url;
  98
  99                 # For links that came from outside, check for alternate/legacy
 100                 # character encoding.
 101                 wfDebug( "Servr: $wgServer\n" );
 102                 if( empty( $_SERVER["HTTP_REFERER"] ) ||
 103                         strncmp($wgServer, $_SERVER["HTTP_REFERER"], strlen( $wgServer ) ) )
 104                 {
 105                         $s = $wgLang->checkTitleEncoding( $s );
 106                 } else {
 107                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 108                 }
 109
 110                 $t->mDbkeyform = str_replace( " ", "_", $s );
 111                 if( $t->secureAndSplit() ) {
 112
 113                         # check that lenght of title is < cur_title size
 114                         $sql = "SHOW COLUMNS FROM cur LIKE \"cur_title\";";
 115                         $cur_title_object = wfFetchObject(wfQuery( $sql, DB_READ ));
 116
 117                         preg_match( "/\((.*)\)/", $cur_title_object->Type, $cur_title_size);
 118
 119                         if (strlen($t->mDbkeyform) > $cur_title_size[1] ) {
 120                                 return NULL;
 121                         }
 122
 123                         return $t;
 124                 } else {
 125                         return NULL;
 126                 }
 127         }
 128
 129         # From a cur_id
 130         # This is inefficiently implemented, the cur row is requested but not
 131         # used for anything else
 132         /* static */ function newFromID( $id )
 133         {
 134                 $fname = "Title::newFromID";
 135                 $row = wfGetArray( "cur", array( "cur_namespace", "cur_title" ),
 136                         array( "cur_id" => $id ), $fname );
 137                 if ( $row !== false ) {
 138                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 139                 } else {
 140                         $title = NULL;
 141                 }
 142                 return $title;
 143         }
 144
 145         # From a namespace index and a DB key
 146         /* static */ function makeTitle( $ns, $title )
 147         {
 148                 $t = new Title();
 149                 $t->mDbkeyform = Title::makeName( $ns, $title );
 150                 if( $t->secureAndSplit() ) {
 151                         return $t;
 152                 } else {
 153                         return NULL;
 154                 }
 155         }
 156
 157         function newMainPage()
 158         {
 159                 return Title::newFromText( wfMsg( "mainpage" ) );
 160         }
 161
 162 #----------------------------------------------------------------------------
 163 #       Static functions
 164 #----------------------------------------------------------------------------
 165
 166         # Get the prefixed DB key associated with an ID
 167         /* static */ function nameOf( $id )
 168         {
 169                 $sql = "SELECT cur_namespace,cur_title FROM cur WHERE " .
 170                   "cur_id={$id}";
 171                 $res = wfQuery( $sql, DB_READ, "Article::nameOf" );
 172                 if ( 0 == wfNumRows( $res ) ) { return NULL; }
 173
 174                 $s = wfFetchObject( $res );
 175                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 176                 return $n;
 177         }
 178
 179         # Get a regex character class describing the legal characters in a link
 180         /* static */ function legalChars()
 181         {
 182                 # Missing characters:
 183                 #  * []|# Needed for link syntax
 184                 #  * % and + are corrupted by Apache when they appear in the path
 185                 #
 186                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 187                 # this breaks interlanguage links
 188
 189                 $set = " !\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 190                 return $set;
 191         }
 192
 193         # Returns a stripped-down a title string ready for the search index
 194         # Takes a namespace index and a text-form main part
 195         /* static */ function indexTitle( $ns, $title )
 196         {
 197                 global $wgDBminWordLen, $wgLang;
 198
 199                 $lc = SearchEngine::legalSearchChars() . "&#;";
 200                 $t = $wgLang->stripForSearch( $title );
 201                 $t = preg_replace( "/[^{$lc}]+/", " ", $t );
 202                 $t = strtolower( $t );
 203
 204                 # Handle 's, s'
 205                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 206                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 207
 208                 $t = preg_replace( "/\\s+/", " ", $t );
 209
 210                 if ( $ns == Namespace::getImage() ) {
 211                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 212                 }
 213                 return trim( $t );
 214         }
 215
 216         # Make a prefixed DB key from a DB key and a namespace index
 217         /* static */ function makeName( $ns, $title )
 218         {
 219                 global $wgLang;
 220
 221                 $n = $wgLang->getNsText( $ns );
 222                 if ( "" == $n ) { return $title; }
 223                 else { return "{$n}:{$title}"; }
 224         }
 225
 226         # Arguably static
 227         # Returns the URL associated with an interwiki prefix
 228         # The URL contains $1, which is replaced by the title
 229         function getInterwikiLink( $key )
 230         {
 231                 global $wgMemc, $wgDBname, $wgInterwikiExpiry;
 232                 static $wgTitleInterwikiCache = array();
 233
 234                 $k = "$wgDBname:interwiki:$key";
 235
 236                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 237                         return $wgTitleInterwikiCache[$k]->iw_url;
 238
 239                 $s = $wgMemc->get( $k );
 240                 # Ignore old keys with no iw_local
 241                 if( $s && isset( $s->iw_local ) ) {
 242                         $wgTitleInterwikiCache[$k] = $s;
 243                         return $s->iw_url;
 244                 }
 245                 $dkey = wfStrencode( $key );
 246                 $query = "SELECT iw_url,iw_local FROM interwiki WHERE iw_prefix='$dkey'";
 247                 $res = wfQuery( $query, DB_READ, "Title::getInterwikiLink" );
 248                 if(!$res) return "";
 249
 250                 $s = wfFetchObject( $res );
 251                 if(!$s) {
 252                         $s = (object)false;
 253                         $s->iw_url = "";
 254                 }
 255                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 256                 $wgTitleInterwikiCache[$k] = $s;
 257                 return $s->iw_url;
 258         }
 259
 260         function isLocal() {
 261                 global $wgTitleInterwikiCache, $wgDBname;
 262
 263                 if ( $this->mInterwiki != "" ) {
 264                         # Make sure key is loaded into cache
 265                         $this->getInterwikiLink( $this->mInterwiki );
 266                         $k = "$wgDBname:interwiki:" . $this->mInterwiki;
 267                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 268                 } else {
 269                         return true;
 270                 }
 271         }
 272
 273         # Update the cur_touched field for an array of title objects
 274         # Inefficient unless the IDs are already loaded into the link cache
 275         /* static */ function touchArray( $titles, $timestamp = "" ) {
 276                 if ( count( $titles ) == 0 ) {
 277                         return;
 278                 }
 279                 if ( $timestamp == "" ) {
 280                         $timestamp = wfTimestampNow();
 281                 }
 282                 $sql = "UPDATE cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 283                 $first = true;
 284
 285                 foreach ( $titles as $title ) {
 286                         if ( ! $first ) {
 287                                 $sql .= ",";
 288                         }
 289
 290                         $first = false;
 291                         $sql .= $title->getArticleID();
 292                 }
 293                 $sql .= ")";
 294                 if ( ! $first ) {
 295                         wfQuery( $sql, DB_WRITE, "Title::touchArray" );
 296                 }
 297         }
 298
 299 #----------------------------------------------------------------------------
 300 #       Other stuff
 301 #----------------------------------------------------------------------------
 302
 303         # Simple accessors
 304         # See the definitions at the top of this file
 305
 306         function getText() { return $this->mTextform; }
 307         function getPartialURL() { return $this->mUrlform; }
 308         function getDBkey() { return $this->mDbkeyform; }
 309         function getNamespace() { return $this->mNamespace; }
 310         function setNamespace( $n ) { $this->mNamespace = $n; }
 311         function getInterwiki() { return $this->mInterwiki; }
 312         function getFragment() { return $this->mFragment; }
 313         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 314
 315         # Get title for search index
 316         function getIndexTitle()
 317         {
 318                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 319         }
 320
 321         # Get prefixed title with underscores
 322         function getPrefixedDBkey()
 323         {
 324                 $s = $this->prefix( $this->mDbkeyform );
 325                 $s = str_replace( " ", "_", $s );
 326                 return $s;
 327         }
 328
 329         # Get prefixed title with spaces
 330         # This is the form usually used for display
 331         function getPrefixedText()
 332         {
 333                 if ( empty( $this->mPrefixedText ) ) {
 334                         $s = $this->prefix( $this->mTextform );
 335                         $s = str_replace( "_", " ", $s );
 336                         $this->mPrefixedText = $s;
 337                 }
 338                 return $this->mPrefixedText;
 339         }
 340
 341         # Get a URL-encoded title (not an actual URL) including interwiki
 342         function getPrefixedURL()
 343         {
 344                 $s = $this->prefix( $this->mDbkeyform );
 345                 $s = str_replace( " ", "_", $s );
 346
 347                 $s = wfUrlencode ( $s ) ;
 348
 349                 # Cleaning up URL to make it look nice -- is this safe?
 350                 $s = preg_replace( "/%3[Aa]/", ":", $s );
 351                 $s = preg_replace( "/%2[Ff]/", "/", $s );
 352                 $s = str_replace( "%28", "(", $s );
 353                 $s = str_replace( "%29", ")", $s );
 354
 355                 return $s;
 356         }
 357
 358         # Get a real URL referring to this title, with interwiki link and fragment
 359         function getFullURL( $query = "" )
 360         {
 361                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 362
 363                 if ( "" == $this->mInterwiki ) {
 364                         $p = $wgArticlePath;
 365                         return $wgServer . $this->getLocalUrl( $query );
 366                 }
 367
 368                 $p = $this->getInterwikiLink( $this->mInterwiki );
 369                 $n = $wgLang->getNsText( $this->mNamespace );
 370                 if ( "" != $n ) { $n .= ":"; }
 371                 $u = str_replace( "$1", $n . $this->mUrlform, $p );
 372                 if ( "" != $this->mFragment ) {
 373                         $u .= "#" . wfUrlencode( $this->mFragment );
 374                 }
 375                 return $u;
 376         }
 377
 378         # Get a URL with an optional query string, no fragment
 379         # * If $query=="", it will use $wgArticlePath
 380         # * Returns a full for an interwiki link, loses any query string
 381         # * Optionally adds the server and escapes for HTML
 382         # * Setting $query to "-" makes an old-style URL with nothing in the
 383         #   query except a title
 384
 385         function getURL() {
 386                 die( "Call to obsolete obsolete function Title::getURL()" );
 387         }
 388
 389         function getLocalURL( $query = "" )
 390         {
 391                 global $wgLang, $wgArticlePath, $wgScript;
 392
 393                 if ( $this->isExternal() ) {
 394                         return $this->getFullURL();
 395                 }
 396
 397                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 398                 if ( $query == "" ) {
 399                         $url = str_replace( "$1", $dbkey, $wgArticlePath );
 400                 } else {
 401                         if ( $query == "-" ) {
 402                                 $query = "";
 403                         }
 404                         if ( $wgScript != "" ) {
 405                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 406                         } else {
 407                                 # Top level wiki
 408                                 $url = "/{$dbkey}?{$query}";
 409                         }
 410                 }
 411                 return $url;
 412         }
 413
 414         function escapeLocalURL( $query = "" ) {
 415                 return wfEscapeHTML( $this->getLocalURL( $query ) );
 416         }
 417
 418         function escapeFullURL( $query = "" ) {
 419                 return wfEscapeHTML( $this->getFullURL( $query ) );
 420         }
 421
 422         function getInternalURL( $query = "" ) {
 423                 # Used in various Squid-related code, in case we have a different
 424                 # internal hostname for the server than the exposed one.
 425                 global $wgInternalServer;
 426                 return $wgInternalServer . $this->getLocalURL( $query );
 427         }
 428
 429         # Get the edit URL, or a null string if it is an interwiki link
 430         function getEditURL()
 431         {
 432                 global $wgServer, $wgScript;
 433
 434                 if ( "" != $this->mInterwiki ) { return ""; }
 435                 $s = $this->getLocalURL( "action=edit" );
 436
 437                 return $s;
 438         }
 439
 440         # Get HTML-escaped displayable text
 441         # For the title field in <a> tags
 442         function getEscapedText()
 443         {
 444                 return wfEscapeHTML( $this->getPrefixedText() );
 445         }
 446
 447         # Is the title interwiki?
 448         function isExternal() { return ( "" != $this->mInterwiki ); }
 449
 450         # Does the title correspond to a protected article?
 451         function isProtected()
 452         {
 453                 if ( -1 == $this->mNamespace ) { return true; }
 454                 $a = $this->getRestrictions();
 455                 if ( in_array( "sysop", $a ) ) { return true; }
 456                 return false;
 457         }
 458
 459         # Is the page a log page, i.e. one where the history is messed up by
 460         # LogPage.php? This used to be used for suppressing diff links in recent
 461         # changes, but now that's done by setting a flag in the recentchanges
 462         # table. Hence, this probably is no longer used.
 463         function isLog()
 464         {
 465                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 466                         return false;
 467                 }
 468                 if ( ( 0 == strcmp( wfMsg( "uploadlogpage" ), $this->mDbkeyform ) ) ||
 469                   ( 0 == strcmp( wfMsg( "dellogpage" ), $this->mDbkeyform ) ) ) {
 470                         return true;
 471                 }
 472                 return false;
 473         }
 474
 475         # Is $wgUser is watching this page?
 476         function userIsWatching()
 477         {
 478                 global $wgUser;
 479
 480                 if ( -1 == $this->mNamespace ) { return false; }
 481                 if ( 0 == $wgUser->getID() ) { return false; }
 482
 483                 return $wgUser->isWatched( $this );
 484         }
 485
 486         # Can $wgUser edit this page?
 487         function userCanEdit()
 488         {
 489
 490                 if ( -1 == $this->mNamespace ) { return false; }
 491                 # if ( 0 == $this->getArticleID() ) { return false; }
 492                 if ( $this->mDbkeyform == "_" ) { return false; }
 493                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 494                 # protect css/js subpages of user pages
 495                 # XXX: this might be better using restrictions
 496                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 497                 global $wgUser;
 498                 if( Namespace::getUser() == $this->mNamespace
 499                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 500                         and !$wgUser->isSysop()
 501                         and !preg_match("/^".preg_quote($wgUser->getName(), '/')."/", $this->mTextform) )
 502                 { return false; }
 503                 $ur = $wgUser->getRights();
 504                 foreach ( $this->getRestrictions() as $r ) {
 505                         if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
 506                                 return false;
 507                         }
 508                 }
 509                 return true;
 510         }
 511
 512         function userCanRead() {
 513                 global $wgUser;
 514                 global $wgWhitelistRead;
 515
 516                 if( 0 != $wgUser->getID() ) return true;
 517                 if( !is_array( $wgWhitelistRead ) ) return true;
 518
 519                 $name = $this->getPrefixedText();
 520                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 521
 522                 # Compatibility with old settings
 523                 if( $this->getNamespace() == NS_ARTICLE ) {
 524                         if( in_array( ":" . $name, $wgWhitelistRead ) ) return true;
 525                 }
 526                 return false;
 527         }
 528
 529         function isCssJsSubpage() {
 530                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 531         }
 532         function isCssSubpage() {
 533                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 534         }
 535         function isJsSubpage() {
 536                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 537         }
 538         function userCanEditCssJsSubpage() {
 539                 # protect css/js subpages of user pages
 540                 # XXX: this might be better using restrictions
 541                 global $wgUser;
 542                 return ( $wgUser->isSysop() or preg_match("/^".preg_quote($wgUser->getName())."/", $this->mTextform) );
 543         }
 544
 545         # Accessor/initialisation for mRestrictions
 546         function getRestrictions()
 547         {
 548                 $id = $this->getArticleID();
 549                 if ( 0 == $id ) { return array(); }
 550
 551                 if ( ! $this->mRestrictionsLoaded ) {
 552                         $res = wfGetSQL( "cur", "cur_restrictions", "cur_id=$id" );
 553                         $this->mRestrictions = explode( ",", trim( $res ) );
 554                         $this->mRestrictionsLoaded = true;
 555                 }
 556                 return $this->mRestrictions;
 557         }
 558
 559         # Is there a version of this page in the deletion archive?
 560         function isDeleted() {
 561                 $ns = $this->getNamespace();
 562                 $t = wfStrencode( $this->getDBkey() );
 563                 $sql = "SELECT COUNT(*) AS n FROM archive WHERE ar_namespace=$ns AND ar_title='$t'";
 564                 if( $res = wfQuery( $sql, DB_READ ) ) {
 565                         $s = wfFetchObject( $res );
 566                         return $s->n;
 567                 }
 568                 return 0;
 569         }
 570
 571         # Get the article ID from the link cache
 572         # Used very heavily, e.g. in Parser::replaceInternalLinks()
 573         function getArticleID()
 574         {
 575                 global $wgLinkCache;
 576
 577                 if ( -1 != $this->mArticleID ) { return $this->mArticleID; }
 578                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 579                 return $this->mArticleID;
 580         }
 581
 582         # This clears some fields in this object, and clears any associated keys in the
 583         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 584         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 585         function resetArticleID( $newid )
 586         {
 587                 global $wgLinkCache;
 588                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 589
 590                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 591                 else { $this->mArticleID = $newid; }
 592                 $this->mRestrictionsLoaded = false;
 593                 $this->mRestrictions = array();
 594         }
 595
 596         # Updates cur_touched
 597         # Called from LinksUpdate.php
 598         function invalidateCache() {
 599                 $now = wfTimestampNow();
 600                 $ns = $this->getNamespace();
 601                 $ti = wfStrencode( $this->getDBkey() );
 602                 $sql = "UPDATE cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";
 603                 return wfQuery( $sql, DB_WRITE, "Title::invalidateCache" );
 604         }
 605
 606         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 607         /* private */ function prefix( $name )
 608         {
 609                 global $wgLang;
 610
 611                 $p = "";
 612                 if ( "" != $this->mInterwiki ) {
 613                         $p = $this->mInterwiki . ":";
 614                 }
 615                 if ( 0 != $this->mNamespace ) {
 616                         $p .= $wgLang->getNsText( $this->mNamespace ) . ":";
 617                 }
 618                 return $p . $name;
 619         }
 620
 621         # Secure and split - main initialisation function for this object
 622         #
 623         # Assumes that mDbkeyform has been set, and is urldecoded
 624     # and uses undersocres, but not otherwise munged.  This function
 625     # removes illegal characters, splits off the winterwiki and
 626     # namespace prefixes, sets the other forms, and canonicalizes
 627     # everything.
 628         #
 629         /* private */ function secureAndSplit()
 630         {
 631                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 632                 $fname = "Title::secureAndSplit";
 633                 wfProfileIn( $fname );
 634
 635                 static $imgpre = false;
 636                 static $rxTc = false;
 637
 638                 # Initialisation
 639                 if ( $imgpre === false ) {
 640                         $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
 641                         $rxTc = "/[^" . Title::legalChars() . "]/";
 642                 }
 643
 644                 $this->mInterwiki = $this->mFragment = "";
 645                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 646
 647                 # Clean up whitespace
 648                 #
 649                 $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
 650                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 651
 652                 if ( "" == $t ) {
 653                         wfProfileOut( $fname );
 654                         return false;
 655                 }
 656
 657                 $this->mDbkeyform = $t;
 658                 $done = false;
 659
 660                 # :Image: namespace
 661                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 662                         $t = substr( $t, 1 );
 663                 }
 664
 665                 # Initial colon indicating main namespace
 666                 if ( ":" == $t{0} ) {
 667                         $r = substr( $t, 1 );
 668                         $this->mNamespace = NS_MAIN;
 669                 } else {
 670                         # Namespace or interwiki prefix
 671                         if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
 672                                 #$p = strtolower( $m[1] );
 673                                 $p = $m[1];
 674                                 $lowerNs = strtolower( $p );
 675                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 676                                         # Canonical namespace
 677                                         $t = $m[2];
 678                                         $this->mNamespace = $ns;
 679                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 680                                         # Ordinary namespace
 681                                         $t = $m[2];
 682                                         $this->mNamespace = $ns;
 683                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 684                                         # Interwiki link
 685                                         $t = $m[2];
 686                                         $this->mInterwiki = $p;
 687
 688                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 689                                                 $done = true;
 690                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 691                                                 $done = true;
 692                                         }
 693                                 }
 694                         }
 695                         $r = $t;
 696                 }
 697
 698                 # Redundant interwiki prefix to the local wiki
 699                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 700                         $this->mInterwiki = "";
 701                 }
 702                 # We already know that some pages won't be in the database!
 703                 #
 704                 if ( "" != $this->mInterwiki || -1 == $this->mNamespace ) {
 705                         $this->mArticleID = 0;
 706                 }
 707                 $f = strstr( $r, "#" );
 708                 if ( false !== $f ) {
 709                         $this->mFragment = substr( $f, 1 );
 710                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 711                 }
 712
 713                 # Reject illegal characters.
 714                 #
 715                 if( preg_match( $rxTc, $r ) ) {
 716                         return false;
 717                 }
 718
 719                 # "." and ".." conflict with the directories of those names
 720                 if ( $r === "." || $r === ".." ) {
 721                         return false;
 722                 }
 723
 724                 # Initial capital letter
 725                 if( $wgCapitalLinks && $this->mInterwiki == "") {
 726                         $t = $wgLang->ucfirst( $r );
 727                 }
 728
 729                 # Fill fields
 730                 $this->mDbkeyform = $t;
 731                 $this->mUrlform = wfUrlencode( $t );
 732
 733                 $this->mTextform = str_replace( "_", " ", $t );
 734
 735                 wfProfileOut( $fname );
 736                 return true;
 737         }
 738
 739         # Get a title object associated with the talk page of this article
 740         function getTalkPage() {
 741                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 742         }
 743
 744         # Get a title object associated with the subject page of this talk page
 745         function getSubjectPage() {
 746                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 747         }
 748
 749         # Get an array of Title objects linking to this title
 750         # Also stores the IDs in the link cache
 751         function getLinksTo() {
 752                 global $wgLinkCache;
 753                 $id = $this->getArticleID();
 754                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
 755                 $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
 756                 $retVal = array();
 757                 if ( wfNumRows( $res ) ) {
 758                         while ( $row = wfFetchObject( $res ) ) {
 759                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 760                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 761                                 $retVal[] = $titleObj;
 762                         }
 763                 }
 764                 wfFreeResult( $res );
 765                 return $retVal;
 766         }
 767
 768         # Get an array of Title objects linking to this non-existent title
 769         # Also stores the IDs in the link cache
 770         function getBrokenLinksTo() {
 771                 global $wgLinkCache;
 772                 $encTitle = wfStrencode( $this->getPrefixedDBkey() );
 773                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
 774                   "WHERE bl_from=cur_id AND bl_to='$encTitle'";
 775                 $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
 776                 $retVal = array();
 777                 if ( wfNumRows( $res ) ) {
 778                         while ( $row = wfFetchObject( $res ) ) {
 779                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 780                                 $wgLinkCache->addGoodLink( $titleObj->getPrefixedDBkey(), $row->cur_id );
 781                                 $retVal[] = $titleObj;
 782                         }
 783                 }
 784                 wfFreeResult( $res );
 785                 return $retVal;
 786         }
 787
 788         function getSquidURLs() {
 789                 return array(
 790                         $this->getInternalURL(),
 791                         $this->getInternalURL( "action=history" )
 792                 );
 793         }
 794
 795         function moveNoAuth( &$nt ) {
 796                 return $this->moveTo( $nt, false );
 797         }
 798
 799         # Move a title to a new location
 800         # Returns true on success, message name on failure
 801         # auth indicates whether wgUser's permissions should be checked
 802         function moveTo( &$nt, $auth = true ) {
 803                 if( !$this or !$nt ) {
 804                         return "badtitletext";
 805                 }
 806
 807                 $fname = "Title::move";
 808                 $oldid = $this->getArticleID();
 809                 $newid = $nt->getArticleID();
 810
 811                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 812                         return "articleexists";
 813                 }
 814                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 815                          ( "" == $this->getDBkey() ) ||
 816                          ( "" != $this->getInterwiki() ) ||
 817                          ( !$oldid ) ||
 818                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 819                          ( "" == $nt->getDBkey() ) ||
 820                          ( "" != $nt->getInterwiki() ) ) {
 821                         return "badarticleerror";
 822                 }
 823
 824                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 825                         return "protectedpage";
 826                 }
 827
 828                 # The move is allowed only if (1) the target doesn't exist, or
 829                 # (2) the target is a redirect to the source, and has no history
 830                 # (so we can undo bad moves right after they're done).
 831
 832                 if ( 0 != $newid ) { # Target exists; check for validity
 833                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 834                                 return "articleexists";
 835                         }
 836                         $this->moveOverExistingRedirect( $nt );
 837                 } else { # Target didn't exist, do normal move.
 838                         $this->moveToNewTitle( $nt, $newid );
 839                 }
 840
 841                 # Update watchlists
 842
 843                 $oldnamespace = $this->getNamespace() & ~1;
 844                 $newnamespace = $nt->getNamespace() & ~1;
 845                 $oldtitle = $this->getDBkey();
 846                 $newtitle = $nt->getDBkey();
 847
 848                 if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
 849                         WatchedItem::duplicateEntries( $this, $nt );
 850                 }
 851
 852                 # Update search engine
 853                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 854                 $u->doUpdate();
 855                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
 856                 $u->doUpdate();
 857
 858                 return true;
 859         }
 860
 861         # Move page to title which is presently a redirect to the source page
 862
 863         /* private */ function moveOverExistingRedirect( &$nt )
 864         {
 865                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 866                 $fname = "Title::moveOverExistingRedirect";
 867                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 868
 869         $now = wfTimestampNow();
 870         $won = wfInvertTimestamp( $now );
 871                 $newid = $nt->getArticleID();
 872                 $oldid = $this->getArticleID();
 873
 874                 # Change the name of the target page:
 875                 wfUpdateArray(
 876                         /* table */ 'cur',
 877                         /* SET */ array(
 878                                 'cur_touched' => $now,
 879                                 'cur_namespace' => $nt->getNamespace(),
 880                                 'cur_title' => $nt->getDBkey()
 881                         ),
 882                         /* WHERE */ array( 'cur_id' => $oldid ),
 883                         $fname
 884                 );
 885                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 886
 887                 # Repurpose the old redirect. We don't save it to history since
 888                 # by definition if we've got here it's rather uninteresting.
 889
 890                 $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
 891                 wfUpdateArray(
 892                         /* table */ 'cur',
 893                         /* SET */ array(
 894                                 'cur_touched' => $now,
 895                                 'cur_timestamp' => $now,
 896                                 'inverse_timestamp' => $won,
 897                                 'cur_namespace' => $this->getNamespace(),
 898                                 'cur_title' => $this->getDBkey(),
 899                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
 900                                 'cur_comment' => $comment,
 901                                 'cur_user' => $wgUser->getID(),
 902                                 'cur_minor_edit' => 0,
 903                                 'cur_counter' => 0,
 904                                 'cur_restrictions' => '',
 905                                 'cur_user_text' => $wgUser->getName(),
 906                                 'cur_is_redirect' => 1,
 907                                 'cur_is_new' => 1
 908                         ),
 909                         /* WHERE */ array( 'cur_id' => $newid ),
 910                         $fname
 911                 );
 912
 913                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 914
 915                 # Fix the redundant names for the past revisions of the target page.
 916                 # The redirect should have no old revisions.
 917                 wfUpdateArray(
 918                         /* table */ 'old',
 919                         /* SET */ array(
 920                                 'old_namespace' => $nt->getNamespace(),
 921                                 'old_title' => $nt->getDBkey(),
 922                         ),
 923                         /* WHERE */ array(
 924                                 'old_namespace' => $this->getNamespace(),
 925                                 'old_title' => $this->getDBkey(),
 926                         ),
 927                         $fname
 928                 );
 929
 930                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 931
 932                 # Swap links
 933
 934                 # Load titles and IDs
 935                 $linksToOld = $this->getLinksTo();
 936                 $linksToNew = $nt->getLinksTo();
 937
 938                 # Make function to convert Titles to IDs
 939                 $titleToID = create_function('$t', 'return $t->getArticleID();');
 940
 941                 # Reassign links to old title
 942                 if ( count( $linksToOld ) ) {
 943                         $sql = "UPDATE links SET l_to=$newid WHERE l_from IN (";
 944                         $sql .= implode( ",", array_map( $titleToID, $linksToOld ) );
 945                         $sql .= ")";
 946                         wfQuery( $sql, DB_WRITE, $fname );
 947                 }
 948
 949                 # Reassign links to new title
 950                 if ( count( $linksToNew ) ) {
 951                         $sql = "UPDATE links SET l_to=$oldid WHERE l_from IN (";
 952                         $sql .= implode( ",", array_map( $titleToID, $linksToNew ) );
 953                         $sql .= ")";
 954                         wfQuery( $sql, DB_WRITE, $fname );
 955                 }
 956
 957                 # Note: the insert below must be after the updates above!
 958
 959                 # Now, we record the link from the redirect to the new title.
 960                 # It should have no other outgoing links...
 961                 $sql = "DELETE FROM links WHERE l_from={$newid}";
 962                 wfQuery( $sql, DB_WRITE, $fname );
 963                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 964                 wfQuery( $sql, DB_WRITE, $fname );
 965
 966                 # Purge squid
 967                 if ( $wgUseSquid ) {
 968                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
 969                         $u = new SquidUpdate( $urls );
 970                         $u->doUpdate();
 971                 }
 972         }
 973
 974         # Move page to non-existing title.
 975         # Sets $newid to be the new article ID
 976
 977         /* private */ function moveToNewTitle( &$nt, &$newid )
 978         {
 979                 global $wgUser, $wgLinkCache, $wgUseSquid;
 980                 $fname = "MovePageForm::moveToNewTitle";
 981                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 982
 983                 $now = wfTimestampNow();
 984                 $won = wfInvertTimestamp( $now );
 985                 $newid = $nt->getArticleID();
 986                 $oldid = $this->getArticleID();
 987
 988                 # Rename cur entry
 989                 wfUpdateArray(
 990                         /* table */ 'cur',
 991                         /* SET */ array(
 992                                 'cur_touched' => $now,
 993                                 'cur_namespace' => $nt->getNamespace(),
 994                                 'cur_title' => $nt->getDBkey()
 995                         ),
 996                         /* WHERE */ array( 'cur_id' => $oldid ),
 997                         $fname
 998                 );
 999
1000                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1001
1002                 # Insert redirct
1003                 wfInsertArray( 'cur', array(
1004                         'cur_namespace' => $this->getNamespace(),
1005                         'cur_title' => $this->getDBkey(),
1006                         'cur_comment' => $comment,
1007                         'cur_user' => $wgUser->getID(),
1008                         'cur_user_text' => $wgUser->getName(),
1009                         'cur_timestamp' => $now,
1010                         'inverse_timestamp' => $won,
1011                         'cur_touched' => $now,
1012                         'cur_is_redirect' => 1,
1013                         'cur_is_new' => 1,
1014                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
1015                 );
1016                 $newid = wfInsertId();
1017                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1018
1019                 # Rename old entries
1020                 wfUpdateArray(
1021                         /* table */ 'old',
1022                         /* SET */ array(
1023                                 'old_namespace' => $nt->getNamespace(),
1024                                 'old_title' => $nt->getDBkey()
1025                         ),
1026                         /* WHERE */ array(
1027                                 'old_namespace' => $this->getNamespace(),
1028                                 'old_title' => $this->getDBkey()
1029                         ), $fname
1030                 );
1031
1032                 # Miscellaneous updates
1033
1034                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
1035                 Article::onArticleCreate( $nt );
1036
1037                 # Any text links to the old title must be reassigned to the redirect
1038                 $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
1039                 wfQuery( $sql, DB_WRITE, $fname );
1040
1041                 # Record the just-created redirect's linking to the page
1042                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
1043                 wfQuery( $sql, DB_WRITE, $fname );
1044
1045                 # Non-existent target may have had broken links to it; these must
1046                 # now be removed and made into good links.
1047                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1048                 $update->fixBrokenLinks();
1049
1050                 # Purge old title from squid
1051                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1052                 $titles = $nt->getLinksTo();
1053                 if ( $wgUseSquid ) {
1054                         $urls = $this->getSquidURLs();
1055                         foreach ( $titles as $linkTitle ) {
1056                                 $urls[] = $linkTitle->getInternalURL();
1057                         }
1058                         $u = new SquidUpdate( $urls );
1059                         $u->doUpdate();
1060                 }
1061         }
1062
1063         # Checks if $this can be moved to $nt
1064         # Both titles must exist in the database, otherwise it will blow up
1065         function isValidMoveTarget( $nt )
1066         {
1067                 $fname = "Title::isValidMoveTarget";
1068
1069                 # Is it a redirect?
1070                 $id  = $nt->getArticleID();
1071                 $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
1072                   "WHERE cur_id={$id}";
1073                 $res = wfQuery( $sql, DB_READ, $fname );
1074                 $obj = wfFetchObject( $res );
1075
1076                 if ( 0 == $obj->cur_is_redirect ) {
1077                         # Not a redirect
1078                         return false;
1079                 }
1080
1081                 # Does the redirect point to the source?
1082                 if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
1083                         $redirTitle = Title::newFromText( $m[1] );
1084                         if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
1085                                 return false;
1086                         }
1087                 }
1088
1089                 # Does the article have a history?
1090                 $row = wfGetArray( 'old', array( 'old_id' ), array(
1091                         'old_namespace' => $nt->getNamespace(),
1092                         'old_title' => $nt->getDBkey() )
1093                 );
1094
1095                 # Return true if there was no history
1096                 return $row === false;
1097         }
1098
1099         # Create a redirect, fails if the title already exists, does not notify RC
1100         # Returns success
1101         function createRedirect( $dest, $comment ) {
1102                 global $wgUser;
1103                 if ( $this->getArticleID() ) {
1104                         return false;
1105                 }
1106
1107                 $now = wfTimestampNow();
1108                 $won = wfInvertTimestamp( $now );
1109
1110                 wfInsertArray( 'cur', array(
1111                         'cur_namespace' => $this->getNamespace(),
1112                         'cur_title' => $this->getDBkey(),
1113                         'cur_comment' => $comment,
1114                         'cur_user' => $wgUser->getID(),
1115                         'cur_user_text' => $wgUser->getName(),
1116                         'cur_timestamp' => $now,
1117                         'inverse_timestamp' => $won,
1118                         'cur_touched' => $now,
1119                         'cur_is_redirect' => 1,
1120                         'cur_is_new' => 1,
1121                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1122                 ));
1123                 $newid = wfInsertId();
1124                 $this->resetArticleID( $newid );
1125
1126                 # Link table
1127                 if ( $dest->getArticleID() ) {
1128                         wfInsertArray( 'links', array(
1129                                 'l_to' => $dest->getArticleID(),
1130                                 'l_from' => $newid
1131                         ));
1132                 } else {
1133                         wfInsertArray( 'brokenlinks', array(
1134                                 'bl_to' => $dest->getPrefixedDBkey(),
1135                                 'bl_from' => $newid
1136                         ));
1137                 }
1138
1139                 Article::onArticleCreate( $this );
1140                 return true;
1141         }
1142
1143 }
1144 ?>