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                 global $wgUser;
 490
 491                 if ( -1 == $this->mNamespace ) { return false; }
 492                 # if ( 0 == $this->getArticleID() ) { return false; }
 493                 if ( $this->mDbkeyform == "_" ) { return false; }
 494                 # protect css/js subpages of user pages
 495                 # XXX: this might be better using restrictions
 496                 if( Namespace::getUser() == $this->mNamespace
 497                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 498                         and !$wgUser->isSysop()
 499                         and !preg_match("/^".$wgUser->getName()."/", $this->mTextform) )
 500                 { return false; }
 501
 502                 $ur = $wgUser->getRights();
 503                 foreach ( $this->getRestrictions() as $r ) {
 504                         if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
 505                                 return false;
 506                         }
 507                 }
 508                 return true;
 509         }
 510
 511         # Accessor/initialisation for mRestrictions
 512         function getRestrictions()
 513         {
 514                 $id = $this->getArticleID();
 515                 if ( 0 == $id ) { return array(); }
 516
 517                 if ( ! $this->mRestrictionsLoaded ) {
 518                         $res = wfGetSQL( "cur", "cur_restrictions", "cur_id=$id" );
 519                         $this->mRestrictions = explode( ",", trim( $res ) );
 520                         $this->mRestrictionsLoaded = true;
 521                 }
 522                 return $this->mRestrictions;
 523         }
 524
 525         # Is there a version of this page in the deletion archive?
 526         function isDeleted() {
 527                 $ns = $this->getNamespace();
 528                 $t = wfStrencode( $this->getDBkey() );
 529                 $sql = "SELECT COUNT(*) AS n FROM archive WHERE ar_namespace=$ns AND ar_title='$t'";
 530                 if( $res = wfQuery( $sql, DB_READ ) ) {
 531                         $s = wfFetchObject( $res );
 532                         return $s->n;
 533                 }
 534                 return 0;
 535         }
 536
 537         # Get the article ID from the link cache
 538         # Used very heavily, e.g. in Parser::replaceInternalLinks()
 539         function getArticleID()
 540         {
 541                 global $wgLinkCache;
 542
 543                 if ( -1 != $this->mArticleID ) { return $this->mArticleID; }
 544                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 545                 return $this->mArticleID;
 546         }
 547
 548         # This clears some fields in this object, and clears any associated keys in the
 549         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 550         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 551         function resetArticleID( $newid )
 552         {
 553                 global $wgLinkCache;
 554                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 555
 556                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 557                 else { $this->mArticleID = $newid; }
 558                 $this->mRestrictionsLoaded = false;
 559                 $this->mRestrictions = array();
 560         }
 561
 562         # Updates cur_touched
 563         # Called from LinksUpdate.php
 564         function invalidateCache() {
 565                 $now = wfTimestampNow();
 566                 $ns = $this->getNamespace();
 567                 $ti = wfStrencode( $this->getDBkey() );
 568                 $sql = "UPDATE cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";
 569                 return wfQuery( $sql, DB_WRITE, "Title::invalidateCache" );
 570         }
 571
 572         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 573         /* private */ function prefix( $name )
 574         {
 575                 global $wgLang;
 576
 577                 $p = "";
 578                 if ( "" != $this->mInterwiki ) {
 579                         $p = $this->mInterwiki . ":";
 580                 }
 581                 if ( 0 != $this->mNamespace ) {
 582                         $p .= $wgLang->getNsText( $this->mNamespace ) . ":";
 583                 }
 584                 return $p . $name;
 585         }
 586
 587         # Secure and split - main initialisation function for this object
 588         #
 589         # Assumes that mDbkeyform has been set, and is urldecoded
 590     # and uses undersocres, but not otherwise munged.  This function
 591     # removes illegal characters, splits off the winterwiki and
 592     # namespace prefixes, sets the other forms, and canonicalizes
 593     # everything.
 594         #
 595         /* private */ function secureAndSplit()
 596         {
 597                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 598                 $fname = "Title::secureAndSplit";
 599                 wfProfileIn( $fname );
 600
 601                 static $imgpre = false;
 602                 static $rxTc = false;
 603
 604                 # Initialisation
 605                 if ( $imgpre === false ) {
 606                         $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
 607                         $rxTc = "/[^" . Title::legalChars() . "]/";
 608                 }
 609
 610                 $this->mInterwiki = $this->mFragment = "";
 611                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 612
 613                 # Clean up whitespace
 614                 #
 615                 $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
 616                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 617
 618                 if ( "" == $t ) {
 619                         wfProfileOut( $fname );
 620                         return false;
 621                 }
 622
 623                 $this->mDbkeyform = $t;
 624                 $done = false;
 625
 626                 # :Image: namespace
 627                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 628                         $t = substr( $t, 1 );
 629                 }
 630
 631                 # Initial colon indicating main namespace
 632                 if ( ":" == $t{0} ) {
 633                         $r = substr( $t, 1 );
 634                         $this->mNamespace = NS_MAIN;
 635                 } else {
 636                         # Namespace or interwiki prefix
 637                         if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
 638                                 #$p = strtolower( $m[1] );
 639                                 $p = $m[1];
 640                                 $lowerNs = strtolower( $p );
 641                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 642                                         # Canonical namespace
 643                                         $t = $m[2];
 644                                         $this->mNamespace = $ns;
 645                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 646                                         # Ordinary namespace
 647                                         $t = $m[2];
 648                                         $this->mNamespace = $ns;
 649                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 650                                         # Interwiki link
 651                                         $t = $m[2];
 652                                         $this->mInterwiki = $p;
 653
 654                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 655                                                 $done = true;
 656                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 657                                                 $done = true;
 658                                         }
 659                                 }
 660                         }
 661                         $r = $t;
 662                 }
 663
 664                 # Redundant interwiki prefix to the local wiki
 665                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 666                         $this->mInterwiki = "";
 667                 }
 668                 # We already know that some pages won't be in the database!
 669                 #
 670                 if ( "" != $this->mInterwiki || -1 == $this->mNamespace ) {
 671                         $this->mArticleID = 0;
 672                 }
 673                 $f = strstr( $r, "#" );
 674                 if ( false !== $f ) {
 675                         $this->mFragment = substr( $f, 1 );
 676                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 677                 }
 678
 679                 # Reject illegal characters.
 680                 #
 681                 if( preg_match( $rxTc, $r ) ) {
 682                         return false;
 683                 }
 684
 685                 # "." and ".." conflict with the directories of those names
 686                 if ( $r === "." || $r === ".." ) {
 687                         return false;
 688                 }
 689
 690                 # Initial capital letter
 691                 if( $wgCapitalLinks && $this->mInterwiki == "") {
 692                         $t = $wgLang->ucfirst( $r );
 693                 }
 694
 695                 # Fill fields
 696                 $this->mDbkeyform = $t;
 697                 $this->mUrlform = wfUrlencode( $t );
 698
 699                 $this->mTextform = str_replace( "_", " ", $t );
 700
 701                 wfProfileOut( $fname );
 702                 return true;
 703         }
 704
 705         # Get a title object associated with the talk page of this article
 706         function getTalkPage() {
 707                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 708         }
 709
 710         # Get a title object associated with the subject page of this talk page
 711         function getSubjectPage() {
 712                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 713         }
 714
 715         # Get an array of Title objects linking to this title
 716         # Also stores the IDs in the link cache
 717         function getLinksTo() {
 718                 global $wgLinkCache;
 719                 $id = $this->getArticleID();
 720                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
 721                 $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
 722                 $retVal = array();
 723                 if ( wfNumRows( $res ) ) {
 724                         while ( $row = wfFetchObject( $res ) ) {
 725                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 726                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 727                                 $retVal[] = $titleObj;
 728                         }
 729                 }
 730                 wfFreeResult( $res );
 731                 return $retVal;
 732         }
 733
 734         # Get an array of Title objects linking to this non-existent title
 735         # Also stores the IDs in the link cache
 736         function getBrokenLinksTo() {
 737                 global $wgLinkCache;
 738                 $encTitle = wfStrencode( $this->getPrefixedDBkey() );
 739                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
 740                   "WHERE bl_from=cur_id AND bl_to='$encTitle'";
 741                 $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
 742                 $retVal = array();
 743                 if ( wfNumRows( $res ) ) {
 744                         while ( $row = wfFetchObject( $res ) ) {
 745                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 746                                 $wgLinkCache->addGoodLink( $titleObj->getPrefixedDBkey(), $row->cur_id );
 747                                 $retVal[] = $titleObj;
 748                         }
 749                 }
 750                 wfFreeResult( $res );
 751                 return $retVal;
 752         }
 753
 754         function getSquidURLs() {
 755                 return array(
 756                         $this->getInternalURL(),
 757                         $this->getInternalURL( "action=history" )
 758                 );
 759         }
 760
 761         function moveNoAuth( &$nt ) {
 762                 return $this->moveTo( $nt, false );
 763         }
 764
 765         # Move a title to a new location
 766         # Returns true on success, message name on failure
 767         # auth indicates whether wgUser's permissions should be checked
 768         function moveTo( &$nt, $auth = true ) {
 769                 if( !$this or !$nt ) {
 770                         return "badtitletext";
 771                 }
 772
 773                 $fname = "Title::move";
 774                 $oldid = $this->getArticleID();
 775                 $newid = $nt->getArticleID();
 776
 777                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 778                         return "articleexists";
 779                 }
 780                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 781                          ( "" == $this->getDBkey() ) ||
 782                          ( "" != $this->getInterwiki() ) ||
 783                          ( !$oldid ) ||
 784                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 785                          ( "" == $nt->getDBkey() ) ||
 786                          ( "" != $nt->getInterwiki() ) ) {
 787                         return "badarticleerror";
 788                 }
 789
 790                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 791                         return "protectedpage";
 792                 }
 793
 794                 # The move is allowed only if (1) the target doesn't exist, or
 795                 # (2) the target is a redirect to the source, and has no history
 796                 # (so we can undo bad moves right after they're done).
 797
 798                 if ( 0 != $newid ) { # Target exists; check for validity
 799                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 800                                 return "articleexists";
 801                         }
 802                         $this->moveOverExistingRedirect( $nt );
 803                 } else { # Target didn't exist, do normal move.
 804                         $this->moveToNewTitle( $nt, $newid );
 805                 }
 806
 807                 # Update watchlists
 808
 809                 $oldnamespace = $this->getNamespace() & ~1;
 810                 $newnamespace = $nt->getNamespace() & ~1;
 811                 $oldtitle = $this->getDBkey();
 812                 $newtitle = $nt->getDBkey();
 813
 814                 if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
 815                         WatchedItem::duplicateEntries( $this, $nt );
 816                 }
 817
 818                 # Update search engine
 819                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 820                 $u->doUpdate();
 821                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
 822                 $u->doUpdate();
 823
 824                 return true;
 825         }
 826
 827         # Move page to title which is presently a redirect to the source page
 828
 829         /* private */ function moveOverExistingRedirect( &$nt )
 830         {
 831                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 832                 $fname = "Title::moveOverExistingRedirect";
 833                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 834
 835         $now = wfTimestampNow();
 836         $won = wfInvertTimestamp( $now );
 837                 $newid = $nt->getArticleID();
 838                 $oldid = $this->getArticleID();
 839
 840                 # Change the name of the target page:
 841                 wfUpdateArray(
 842                         /* table */ 'cur',
 843                         /* SET */ array(
 844                                 'cur_touched' => $now,
 845                                 'cur_namespace' => $nt->getNamespace(),
 846                                 'cur_title' => $nt->getDBkey()
 847                         ),
 848                         /* WHERE */ array( 'cur_id' => $oldid ),
 849                         $fname
 850                 );
 851                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 852
 853                 # Repurpose the old redirect. We don't save it to history since
 854                 # by definition if we've got here it's rather uninteresting.
 855
 856                 $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
 857                 wfUpdateArray(
 858                         /* table */ 'cur',
 859                         /* SET */ array(
 860                                 'cur_touched' => $now,
 861                                 'cur_timestamp' => $now,
 862                                 'inverse_timestamp' => $won,
 863                                 'cur_namespace' => $this->getNamespace(),
 864                                 'cur_title' => $this->getDBkey(),
 865                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
 866                                 'cur_comment' => $comment,
 867                                 'cur_user' => $wgUser->getID(),
 868                                 'cur_minor_edit' => 0,
 869                                 'cur_counter' => 0,
 870                                 'cur_restrictions' => '',
 871                                 'cur_user_text' => $wgUser->getName(),
 872                                 'cur_is_redirect' => 1,
 873                                 'cur_is_new' => 1
 874                         ),
 875                         /* WHERE */ array( 'cur_id' => $newid ),
 876                         $fname
 877                 );
 878
 879                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 880
 881                 # Fix the redundant names for the past revisions of the target page.
 882                 # The redirect should have no old revisions.
 883                 wfUpdateArray(
 884                         /* table */ 'old',
 885                         /* SET */ array(
 886                                 'old_namespace' => $nt->getNamespace(),
 887                                 'old_title' => $nt->getDBkey(),
 888                         ),
 889                         /* WHERE */ array(
 890                                 'old_namespace' => $this->getNamespace(),
 891                                 'old_title' => $this->getDBkey(),
 892                         ),
 893                         $fname
 894                 );
 895
 896                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 897
 898                 # Swap links
 899
 900                 # Load titles and IDs
 901                 $linksToOld = $this->getLinksTo();
 902                 $linksToNew = $nt->getLinksTo();
 903
 904                 # Make function to convert Titles to IDs
 905                 $titleToID = create_function('$t', 'return $t->getArticleID();');
 906
 907                 # Reassign links to old title
 908                 if ( count( $linksToOld ) ) {
 909                         $sql = "UPDATE links SET l_to=$newid WHERE l_from IN (";
 910                         $sql .= implode( ",", array_map( $titleToID, $linksToOld ) );
 911                         $sql .= ")";
 912                         wfQuery( $sql, DB_WRITE, $fname );
 913                 }
 914
 915                 # Reassign links to new title
 916                 if ( count( $linksToNew ) ) {
 917                         $sql = "UPDATE links SET l_to=$oldid WHERE l_from IN (";
 918                         $sql .= implode( ",", array_map( $titleToID, $linksToNew ) );
 919                         $sql .= ")";
 920                         wfQuery( $sql, DB_WRITE, $fname );
 921                 }
 922
 923                 # Note: the insert below must be after the updates above!
 924
 925                 # Now, we record the link from the redirect to the new title.
 926                 # It should have no other outgoing links...
 927                 $sql = "DELETE FROM links WHERE l_from={$newid}";
 928                 wfQuery( $sql, DB_WRITE, $fname );
 929                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 930                 wfQuery( $sql, DB_WRITE, $fname );
 931
 932                 # Purge squid
 933                 if ( $wgUseSquid ) {
 934                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
 935                         $u = new SquidUpdate( $urls );
 936                         $u->doUpdate();
 937                 }
 938         }
 939
 940         # Move page to non-existing title.
 941         # Sets $newid to be the new article ID
 942
 943         /* private */ function moveToNewTitle( &$nt, &$newid )
 944         {
 945                 global $wgUser, $wgLinkCache, $wgUseSquid;
 946                 $fname = "MovePageForm::moveToNewTitle";
 947                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 948
 949                 $now = wfTimestampNow();
 950                 $won = wfInvertTimestamp( $now );
 951                 $newid = $nt->getArticleID();
 952                 $oldid = $this->getArticleID();
 953
 954                 # Rename cur entry
 955                 wfUpdateArray(
 956                         /* table */ 'cur',
 957                         /* SET */ array(
 958                                 'cur_touched' => $now,
 959                                 'cur_namespace' => $nt->getNamespace(),
 960                                 'cur_title' => $nt->getDBkey()
 961                         ),
 962                         /* WHERE */ array( 'cur_id' => $oldid ),
 963                         $fname
 964                 );
 965
 966                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 967
 968                 # Insert redirct
 969                 wfInsertArray( 'cur', array(
 970                         'cur_namespace' => $this->getNamespace(),
 971                         'cur_title' => $this->getDBkey(),
 972                         'cur_comment' => $comment,
 973                         'cur_user' => $wgUser->getID(),
 974                         'cur_user_text' => $wgUser->getName(),
 975                         'cur_timestamp' => $now,
 976                         'inverse_timestamp' => $won,
 977                         'cur_touched' => $now,
 978                         'cur_is_redirect' => 1,
 979                         'cur_is_new' => 1,
 980                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
 981                 );
 982                 $newid = wfInsertId();
 983                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 984
 985                 # Rename old entries
 986                 wfUpdateArray(
 987                         /* table */ 'old',
 988                         /* SET */ array(
 989                                 'old_namespace' => $nt->getNamespace(),
 990                                 'old_title' => $nt->getDBkey()
 991                         ),
 992                         /* WHERE */ array(
 993                                 'old_namespace' => $this->getNamespace(),
 994                                 'old_title' => $this->getDBkey()
 995                         ), $fname
 996                 );
 997
 998                 # Miscellaneous updates
 999
1000                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
1001                 Article::onArticleCreate( $nt );
1002
1003                 # Any text links to the old title must be reassigned to the redirect
1004                 $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
1005                 wfQuery( $sql, DB_WRITE, $fname );
1006
1007                 # Record the just-created redirect's linking to the page
1008                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
1009                 wfQuery( $sql, DB_WRITE, $fname );
1010
1011                 # Non-existent target may have had broken links to it; these must
1012                 # now be removed and made into good links.
1013                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1014                 $update->fixBrokenLinks();
1015
1016                 # Purge old title from squid
1017                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1018                 $titles = $nt->getLinksTo();
1019                 if ( $wgUseSquid ) {
1020                         $urls = $this->getSquidURLs();
1021                         foreach ( $titles as $linkTitle ) {
1022                                 $urls[] = $linkTitle->getInternalURL();
1023                         }
1024                         $u = new SquidUpdate( $urls );
1025                         $u->doUpdate();
1026                 }
1027         }
1028
1029         # Checks if $this can be moved to $nt
1030         # Both titles must exist in the database, otherwise it will blow up
1031         function isValidMoveTarget( $nt )
1032         {
1033                 $fname = "Title::isValidMoveTarget";
1034
1035                 # Is it a redirect?
1036                 $id  = $nt->getArticleID();
1037                 $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
1038                   "WHERE cur_id={$id}";
1039                 $res = wfQuery( $sql, DB_READ, $fname );
1040                 $obj = wfFetchObject( $res );
1041
1042                 if ( 0 == $obj->cur_is_redirect ) {
1043                         # Not a redirect
1044                         return false;
1045                 }
1046
1047                 # Does the redirect point to the source?
1048                 if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
1049                         $redirTitle = Title::newFromText( $m[1] );
1050                         if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
1051                                 return false;
1052                         }
1053                 }
1054
1055                 # Does the article have a history?
1056                 $row = wfGetArray( 'old', array( 'old_id' ), array(
1057                         'old_namespace' => $nt->getNamespace(),
1058                         'old_title' => $nt->getDBkey() )
1059                 );
1060
1061                 # Return true if there was no history
1062                 return $row === false;
1063         }
1064
1065         # Create a redirect, fails if the title already exists, does not notify RC
1066         # Returns success
1067         function createRedirect( $dest, $comment ) {
1068                 global $wgUser;
1069                 if ( $this->getArticleID() ) {
1070                         return false;
1071                 }
1072
1073                 $now = wfTimestampNow();
1074                 $won = wfInvertTimestamp( $now );
1075
1076                 wfInsertArray( 'cur', array(
1077                         'cur_namespace' => $this->getNamespace(),
1078                         'cur_title' => $this->getDBkey(),
1079                         'cur_comment' => $comment,
1080                         'cur_user' => $wgUser->getID(),
1081                         'cur_user_text' => $wgUser->getName(),
1082                         'cur_timestamp' => $now,
1083                         'inverse_timestamp' => $won,
1084                         'cur_touched' => $now,
1085                         'cur_is_redirect' => 1,
1086                         'cur_is_new' => 1,
1087                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1088                 ));
1089                 $newid = wfInsertId();
1090                 $this->resetArticleID( $newid );
1091
1092                 # Link table
1093                 if ( $dest->getArticleID() ) {
1094                         wfInsertArray( 'links', array(
1095                                 'l_to' => $dest->getArticleID(),
1096                                 'l_from' => $newid
1097                         ));
1098                 } else {
1099                         wfInsertArray( 'brokenlinks', array(
1100                                 'bl_to' => $dest->getPrefixedDBkey(),
1101                                 'bl_from' => $newid
1102                         ));
1103                 }
1104
1105                 Article::onArticleCreate( $this );
1106                 return true;
1107         }
1108 }
1109 ?>