includes/Title.php

   1 <?php
   2 # See title.doc
   3
   4 /* private static */ $title_interwiki_cache = 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                 static $trans;
  59                 $fname = "Title::newFromText";
  60                 wfProfileIn( $fname );
  61
  62                 # Note - mixing latin1 named entities and unicode numbered
  63                 # ones will result in a bad link.
  64                 if( !isset( $trans ) ) {
  65                         global $wgInputEncoding;
  66                         $trans = array_flip( get_html_translation_table( HTML_ENTITIES ) );
  67                         if( strcasecmp( "utf-8", $wgInputEncoding ) == 0 ) {
  68                             $trans = array_map( "utf8_encode", $trans );
  69                         }
  70                 }
  71
  72                 if( is_object( $text ) ) {
  73                         wfDebugDieBacktrace( "Called with object instead of string." );
  74                 }
  75                 $text = strtr( $text, $trans );
  76
  77                 $text = wfMungeToUtf8( $text );
  78
  79
  80                 # What was this for? TS 2004-03-03
  81                 # $text = urldecode( $text );
  82
  83                 $t = new Title();
  84                 $t->mDbkeyform = str_replace( " ", "_", $text );
  85         $t->mDefaultNamespace = $defaultNamespace;
  86
  87                 wfProfileOut( $fname );
  88                 if( $t->secureAndSplit() ) {
  89                         return $t;
  90                 } else {
  91                         return NULL;
  92                 }
  93         }
  94
  95         # From a URL-encoded title
  96         /* static */ function newFromURL( $url )
  97         {
  98                 global $wgLang, $wgServer;
  99                 $t = new Title();
 100                 $s = urldecode( $url ); # This is technically wrong, as anything
 101                                                                 # we've gotten is already decoded by PHP.
 102                                                                 # Kept for backwards compatibility with
 103                                                                 # buggy URLs we had for a while...
 104                 $s = $url;
 105
 106                 # For links that came from outside, check for alternate/legacy
 107                 # character encoding.
 108                 wfDebug( "Servr: $wgServer\n" );
 109                 if( empty( $_SERVER["HTTP_REFERER"] ) ||
 110                         strncmp($wgServer, $_SERVER["HTTP_REFERER"], strlen( $wgServer ) ) )
 111                 {
 112                         $s = $wgLang->checkTitleEncoding( $s );
 113                 } else {
 114                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 115                 }
 116
 117                 $t->mDbkeyform = str_replace( " ", "_", $s );
 118                 if( $t->secureAndSplit() ) {
 119
 120                         # check that lenght of title is < cur_title size
 121                         $sql = "SHOW COLUMNS FROM cur LIKE \"cur_title\";";
 122                         $cur_title_object = wfFetchObject(wfQuery( $sql, DB_READ ));
 123
 124                         preg_match( "/\((.*)\)/", $cur_title_object->Type, $cur_title_size);
 125
 126                         if (strlen($t->mDbkeyform) > $cur_title_size[1] ) {
 127                                 return NULL;
 128                         }
 129
 130                         return $t;
 131                 } else {
 132                         return NULL;
 133                 }
 134         }
 135
 136         # From a cur_id
 137         # This is inefficiently implemented, the cur row is requested but not
 138         # used for anything else
 139         /* static */ function newFromID( $id )
 140         {
 141                 $fname = "Title::newFromID";
 142                 $row = wfGetArray( "cur", array( "cur_namespace", "cur_title" ),
 143                         array( "cur_id" => $id ), $fname );
 144                 if ( $row !== false ) {
 145                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 146                 } else {
 147                         $title = NULL;
 148                 }
 149                 return $title;
 150         }
 151
 152         # From a namespace index and a DB key
 153         /* static */ function makeTitle( $ns, $title )
 154         {
 155                 $t = new Title();
 156                 $t->mDbkeyform = Title::makeName( $ns, $title );
 157                 if( $t->secureAndSplit() ) {
 158                         return $t;
 159                 } else {
 160                         return NULL;
 161                 }
 162         }
 163
 164         function newMainPage()
 165         {
 166                 return Title::newFromText( wfMsg( "mainpage" ) );
 167         }
 168
 169 #----------------------------------------------------------------------------
 170 #       Static functions
 171 #----------------------------------------------------------------------------
 172
 173         # Get the prefixed DB key associated with an ID
 174         /* static */ function nameOf( $id )
 175         {
 176                 $sql = "SELECT cur_namespace,cur_title FROM cur WHERE " .
 177                   "cur_id={$id}";
 178                 $res = wfQuery( $sql, DB_READ, "Article::nameOf" );
 179                 if ( 0 == wfNumRows( $res ) ) { return NULL; }
 180
 181                 $s = wfFetchObject( $res );
 182                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 183                 return $n;
 184         }
 185
 186         # Get a regex character class describing the legal characters in a link
 187         /* static */ function legalChars()
 188         {
 189                 # Missing characters:
 190                 #  * []|# Needed for link syntax
 191                 #  * % and + are corrupted by Apache when they appear in the path
 192                 #
 193                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 194                 # this breaks interlanguage links
 195
 196                 $set = " !\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 197                 return $set;
 198         }
 199
 200         # Returns a stripped-down a title string ready for the search index
 201         # Takes a namespace index and a text-form main part
 202         /* static */ function indexTitle( $ns, $title )
 203         {
 204                 global $wgDBminWordLen, $wgLang;
 205
 206                 $lc = SearchEngine::legalSearchChars() . "&#;";
 207                 $t = $wgLang->stripForSearch( $title );
 208                 $t = preg_replace( "/[^{$lc}]+/", " ", $t );
 209                 $t = strtolower( $t );
 210
 211                 # Handle 's, s'
 212                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 213                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 214
 215                 $t = preg_replace( "/\\s+/", " ", $t );
 216
 217                 if ( $ns == Namespace::getImage() ) {
 218                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 219                 }
 220                 return trim( $t );
 221         }
 222
 223         # Make a prefixed DB key from a DB key and a namespace index
 224         /* static */ function makeName( $ns, $title )
 225         {
 226                 global $wgLang;
 227
 228                 $n = $wgLang->getNsText( $ns );
 229                 if ( "" == $n ) { return $title; }
 230                 else { return "{$n}:{$title}"; }
 231         }
 232
 233         # Arguably static
 234         # Returns the URL associated with an interwiki prefix
 235         # The URL contains $1, which is replaced by the title
 236         function getInterwikiLink( $key )
 237         {
 238                 global $wgMemc, $wgDBname;
 239                 static $title_interwiki_cache = array();
 240
 241                 $k = "$wgDBname:interwiki:$key";
 242
 243                 if( array_key_exists( $k, $title_interwiki_cache ) )
 244                         return $title_interwiki_cache[$k]->iw_url;
 245
 246                 $s = $wgMemc->get( $k );
 247                 if( $s ) {
 248                         $title_interwiki_cache[$k] = $s;
 249                         return $s->iw_url;
 250                 }
 251                 $dkey = wfStrencode( $key );
 252                 $query = "SELECT iw_url FROM interwiki WHERE iw_prefix='$dkey'";
 253                 $res = wfQuery( $query, DB_READ, "Title::getInterwikiLink" );
 254                 if(!$res) return "";
 255
 256                 $s = wfFetchObject( $res );
 257                 if(!$s) {
 258                         $s = (object)false;
 259                         $s->iw_url = "";
 260                 }
 261                 $wgMemc->set( $k, $s );
 262                 $title_interwiki_cache[$k] = $s;
 263                 return $s->iw_url;
 264         }
 265
 266         # Update the cur_touched field for an array of title objects
 267         # Inefficient unless the IDs are already loaded into the link cache
 268         /* static */ function touchArray( $titles, $timestamp = "" ) {
 269                 if ( count( $titles ) == 0 ) {
 270                         return;
 271                 }
 272                 if ( $timestamp == "" ) {
 273                         $timestamp = wfTimestampNow();
 274                 }
 275                 $sql = "UPDATE cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 276                 $first = true;
 277
 278                 foreach ( $titles as $title ) {
 279                         if ( ! $first ) {
 280                                 $sql .= ",";
 281                         }
 282
 283                         $first = false;
 284                         $sql .= $title->getArticleID();
 285                 }
 286                 $sql .= ")";
 287                 if ( ! $first ) {
 288                         wfQuery( $sql, DB_WRITE, "Title::touchArray" );
 289                 }
 290         }
 291
 292 #----------------------------------------------------------------------------
 293 #       Other stuff
 294 #----------------------------------------------------------------------------
 295
 296         # Simple accessors
 297         # See the definitions at the top of this file
 298
 299         function getText() { return $this->mTextform; }
 300         function getPartialURL() { return $this->mUrlform; }
 301         function getDBkey() { return $this->mDbkeyform; }
 302         function getNamespace() { return $this->mNamespace; }
 303         function setNamespace( $n ) { $this->mNamespace = $n; }
 304         function getInterwiki() { return $this->mInterwiki; }
 305         function getFragment() { return $this->mFragment; }
 306         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 307
 308         # Get title for search index
 309         function getIndexTitle()
 310         {
 311                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 312         }
 313
 314         # Get prefixed title with underscores
 315         function getPrefixedDBkey()
 316         {
 317                 $s = $this->prefix( $this->mDbkeyform );
 318                 $s = str_replace( " ", "_", $s );
 319                 return $s;
 320         }
 321
 322         # Get prefixed title with spaces
 323         # This is the form usually used for display
 324         function getPrefixedText()
 325         {
 326                 if ( empty( $this->mPrefixedText ) ) {
 327                         $s = $this->prefix( $this->mTextform );
 328                         $s = str_replace( "_", " ", $s );
 329                         $this->mPrefixedText = $s;
 330                 }
 331                 return $this->mPrefixedText;
 332         }
 333
 334         # Get a URL-encoded title (not an actual URL) including interwiki
 335         function getPrefixedURL()
 336         {
 337                 $s = $this->prefix( $this->mDbkeyform );
 338                 $s = str_replace( " ", "_", $s );
 339
 340                 $s = wfUrlencode ( $s ) ;
 341
 342                 # Cleaning up URL to make it look nice -- is this safe?
 343                 $s = preg_replace( "/%3[Aa]/", ":", $s );
 344                 $s = preg_replace( "/%2[Ff]/", "/", $s );
 345                 $s = str_replace( "%28", "(", $s );
 346                 $s = str_replace( "%29", ")", $s );
 347
 348                 return $s;
 349         }
 350
 351         # Get a real URL referring to this title, with interwiki link and fragment
 352         function getFullURL( $query = "" )
 353         {
 354                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 355
 356                 if ( "" == $this->mInterwiki ) {
 357                         $p = $wgArticlePath;
 358                         return $wgServer . $this->getLocalUrl( $query );
 359                 }
 360
 361                 $p = $this->getInterwikiLink( $this->mInterwiki );
 362                 $n = $wgLang->getNsText( $this->mNamespace );
 363                 if ( "" != $n ) { $n .= ":"; }
 364                 $u = str_replace( "$1", $n . $this->mUrlform, $p );
 365                 if ( "" != $this->mFragment ) {
 366                         $u .= "#" . wfUrlencode( $this->mFragment );
 367                 }
 368                 return $u;
 369         }
 370
 371         # Get a URL with an optional query string, no fragment
 372         # * If $query=="", it will use $wgArticlePath
 373         # * Returns a full for an interwiki link, loses any query string
 374         # * Optionally adds the server and escapes for HTML
 375         # * Setting $query to "-" makes an old-style URL with nothing in the
 376         #   query except a title
 377
 378         function getURL() {
 379                 die( "Call to obsolete obsolete function Title::getURL()" );
 380         }
 381
 382         function getLocalURL( $query = "" )
 383         {
 384                 global $wgLang, $wgArticlePath, $wgScript;
 385
 386                 if ( $this->isExternal() ) {
 387                         return $this->getFullURL();
 388                 }
 389
 390                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 391                 if ( $query == "" ) {
 392                         $url = str_replace( "$1", $dbkey, $wgArticlePath );
 393                 } else {
 394                         if ( $query == "-" ) {
 395                                 $query = "";
 396                         }
 397                         if ( $wgScript != "" ) {
 398                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 399                         } else {
 400                                 # Top level wiki
 401                                 $url = "/{$dbkey}?{$query}";
 402                         }
 403                 }
 404                 return $url;
 405         }
 406
 407         function escapeLocalURL( $query = "" ) {
 408                 return wfEscapeHTML( $this->getLocalURL( $query ) );
 409         }
 410
 411         function escapeFullURL( $query = "" ) {
 412                 return wfEscapeHTML( $this->getFullURL( $query ) );
 413         }
 414
 415         function getInternalURL( $query = "" ) {
 416                 # Used in various Squid-related code, in case we have a different
 417                 # internal hostname for the server than the exposed one.
 418                 global $wgInternalServer;
 419                 return $wgInternalServer . $this->getLocalURL( $query );
 420         }
 421
 422         # Get the edit URL, or a null string if it is an interwiki link
 423         function getEditURL()
 424         {
 425                 global $wgServer, $wgScript;
 426
 427                 if ( "" != $this->mInterwiki ) { return ""; }
 428                 $s = $this->getLocalURL( "action=edit" );
 429
 430                 return $s;
 431         }
 432
 433         # Get HTML-escaped displayable text
 434         # For the title field in <a> tags
 435         function getEscapedText()
 436         {
 437                 return wfEscapeHTML( $this->getPrefixedText() );
 438         }
 439
 440         # Is the title interwiki?
 441         function isExternal() { return ( "" != $this->mInterwiki ); }
 442
 443         # Does the title correspond to a protected article?
 444         function isProtected()
 445         {
 446                 if ( -1 == $this->mNamespace ) { return true; }
 447                 $a = $this->getRestrictions();
 448                 if ( in_array( "sysop", $a ) ) { return true; }
 449                 return false;
 450         }
 451
 452         # Is the page a log page, i.e. one where the history is messed up by
 453         # LogPage.php? This used to be used for suppressing diff links in recent
 454         # changes, but now that's done by setting a flag in the recentchanges
 455         # table. Hence, this probably is no longer used.
 456         function isLog()
 457         {
 458                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 459                         return false;
 460                 }
 461                 if ( ( 0 == strcmp( wfMsg( "uploadlogpage" ), $this->mDbkeyform ) ) ||
 462                   ( 0 == strcmp( wfMsg( "dellogpage" ), $this->mDbkeyform ) ) ) {
 463                         return true;
 464                 }
 465                 return false;
 466         }
 467
 468         # Is $wgUser is watching this page?
 469         function userIsWatching()
 470         {
 471                 global $wgUser;
 472
 473                 if ( -1 == $this->mNamespace ) { return false; }
 474                 if ( 0 == $wgUser->getID() ) { return false; }
 475
 476                 return $wgUser->isWatched( $this );
 477         }
 478
 479         # Can $wgUser edit this page?
 480         function userCanEdit()
 481         {
 482                 global $wgUser;
 483
 484                 if ( -1 == $this->mNamespace ) { return false; }
 485                 # if ( 0 == $this->getArticleID() ) { return false; }
 486                 if ( $this->mDbkeyform == "_" ) { return false; }
 487
 488                 $ur = $wgUser->getRights();
 489                 foreach ( $this->getRestrictions() as $r ) {
 490                         if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
 491                                 return false;
 492                         }
 493                 }
 494                 return true;
 495         }
 496
 497         # Accessor/initialisation for mRestrictions
 498         function getRestrictions()
 499         {
 500                 $id = $this->getArticleID();
 501                 if ( 0 == $id ) { return array(); }
 502
 503                 if ( ! $this->mRestrictionsLoaded ) {
 504                         $res = wfGetSQL( "cur", "cur_restrictions", "cur_id=$id" );
 505                         $this->mRestrictions = explode( ",", trim( $res ) );
 506                         $this->mRestrictionsLoaded = true;
 507                 }
 508                 return $this->mRestrictions;
 509         }
 510
 511         # Is there a version of this page in the deletion archive?
 512         function isDeleted() {
 513                 $ns = $this->getNamespace();
 514                 $t = wfStrencode( $this->getDBkey() );
 515                 $sql = "SELECT COUNT(*) AS n FROM archive WHERE ar_namespace=$ns AND ar_title='$t'";
 516                 if( $res = wfQuery( $sql, DB_READ ) ) {
 517                         $s = wfFetchObject( $res );
 518                         return $s->n;
 519                 }
 520                 return 0;
 521         }
 522
 523         # Get the article ID from the link cache
 524         # Used very heavily, e.g. in Parser::replaceInternalLinks()
 525         function getArticleID()
 526         {
 527                 global $wgLinkCache;
 528
 529                 if ( -1 != $this->mArticleID ) { return $this->mArticleID; }
 530                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 531                 return $this->mArticleID;
 532         }
 533
 534         # This clears some fields in this object, and clears any associated keys in the
 535         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 536         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 537         function resetArticleID( $newid )
 538         {
 539                 global $wgLinkCache;
 540                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 541
 542                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 543                 else { $this->mArticleID = $newid; }
 544                 $this->mRestrictionsLoaded = false;
 545                 $this->mRestrictions = array();
 546         }
 547
 548         # Updates cur_touched
 549         # Called from LinksUpdate.php
 550         function invalidateCache() {
 551                 $now = wfTimestampNow();
 552                 $ns = $this->getNamespace();
 553                 $ti = wfStrencode( $this->getDBkey() );
 554                 $sql = "UPDATE cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";
 555                 return wfQuery( $sql, DB_WRITE, "Title::invalidateCache" );
 556         }
 557
 558         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 559         /* private */ function prefix( $name )
 560         {
 561                 global $wgLang;
 562
 563                 $p = "";
 564                 if ( "" != $this->mInterwiki ) {
 565                         $p = $this->mInterwiki . ":";
 566                 }
 567                 if ( 0 != $this->mNamespace ) {
 568                         $p .= $wgLang->getNsText( $this->mNamespace ) . ":";
 569                 }
 570                 return $p . $name;
 571         }
 572
 573         # Secure and split - main initialisation function for this object
 574         #
 575         # Assumes that mDbkeyform has been set, and is urldecoded
 576     # and uses undersocres, but not otherwise munged.  This function
 577     # removes illegal characters, splits off the winterwiki and
 578     # namespace prefixes, sets the other forms, and canonicalizes
 579     # everything.
 580         #
 581         /* private */ function secureAndSplit()
 582         {
 583                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 584                 $fname = "Title::secureAndSplit";
 585                 wfProfileIn( $fname );
 586
 587                 static $imgpre = false;
 588                 static $rxTc = false;
 589
 590                 # Initialisation
 591                 if ( $imgpre === false ) {
 592                         $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
 593                         $rxTc = "/[^" . Title::legalChars() . "]/";
 594                 }
 595
 596                 $this->mInterwiki = $this->mFragment = "";
 597                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 598
 599                 # Clean up whitespace
 600                 #
 601                 $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
 602                 if ( "_" == @$t{0} ) {
 603                         $t = substr( $t, 1 );
 604                 }
 605                 $l = strlen( $t );
 606                 if ( $l && ( "_" == $t{$l-1} ) ) {
 607                         $t = substr( $t, 0, $l-1 );
 608                 }
 609                 if ( "" == $t ) {
 610                         wfProfileOut( $fname );
 611                         return false;
 612                 }
 613
 614                 $this->mDbkeyform = $t;
 615                 $done = false;
 616
 617                 # :Image: namespace
 618                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 619                         $t = substr( $t, 1 );
 620                 }
 621
 622                 # Initial colon indicating main namespace
 623                 if ( ":" == $t{0} ) {
 624                         $r = substr( $t, 1 );
 625                         $this->mNamespace = NS_MAIN;
 626                 } else {
 627                         # Namespace or interwiki prefix
 628                         if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
 629                                 #$p = strtolower( $m[1] );
 630                                 $p = $m[1];
 631                                 if ( $ns = $wgLang->getNsIndex( strtolower( $p ) )) {
 632                                         # Ordinary namespace
 633                                         $t = $m[2];
 634                                         $this->mNamespace = $ns;
 635                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 636                                         # Interwiki link
 637                                         $t = $m[2];
 638                                         $this->mInterwiki = $p;
 639
 640                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 641                                                 $done = true;
 642                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 643                                                 $done = true;
 644                                         }
 645                                 }
 646                         }
 647                         $r = $t;
 648                 }
 649
 650                 # Redundant interwiki prefix to the local wiki
 651                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 652                         $this->mInterwiki = "";
 653                 }
 654                 # We already know that some pages won't be in the database!
 655                 #
 656                 if ( "" != $this->mInterwiki || -1 == $this->mNamespace ) {
 657                         $this->mArticleID = 0;
 658                 }
 659                 $f = strstr( $r, "#" );
 660                 if ( false !== $f ) {
 661                         $this->mFragment = substr( $f, 1 );
 662                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 663                 }
 664
 665                 # Reject illegal characters.
 666                 #
 667                 if( preg_match( $rxTc, $r ) ) {
 668                         return false;
 669                 }
 670
 671                 # "." and ".." conflict with the directories of those names
 672                 if ( $r === "." || $r === ".." ) {
 673                         return false;
 674                 }
 675
 676                 # Initial capital letter
 677                 if( $wgCapitalLinks && $this->mInterwiki == "") {
 678                         $t = $wgLang->ucfirst( $r );
 679                 }
 680
 681                 # Fill fields
 682                 $this->mDbkeyform = $t;
 683                 $this->mUrlform = wfUrlencode( $t );
 684
 685                 $this->mTextform = str_replace( "_", " ", $t );
 686
 687                 wfProfileOut( $fname );
 688                 return true;
 689         }
 690
 691         # Get a title object associated with the talk page of this article
 692         function getTalkPage() {
 693                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 694         }
 695
 696         # Get a title object associated with the subject page of this talk page
 697         function getSubjectPage() {
 698                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 699         }
 700
 701         # Get an array of Title objects linking to this title
 702         # Also stores the IDs in the link cache
 703         function getLinksTo() {
 704                 global $wgLinkCache;
 705                 $id = $this->getArticleID();
 706                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
 707                 $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
 708                 $retVal = array();
 709                 if ( wfNumRows( $res ) ) {
 710                         while ( $row = wfFetchObject( $res ) ) {
 711                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 712                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 713                                 $retVal[] = $titleObj;
 714                         }
 715                 }
 716                 wfFreeResult( $res );
 717                 return $retVal;
 718         }
 719
 720         # Get an array of Title objects linking to this non-existent title
 721         # Also stores the IDs in the link cache
 722         function getBrokenLinksTo() {
 723                 global $wgLinkCache;
 724                 $encTitle = wfStrencode( $this->getPrefixedDBkey() );
 725                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
 726                   "WHERE bl_from=cur_id AND bl_to='$encTitle'";
 727                 $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
 728                 $retVal = array();
 729                 if ( wfNumRows( $res ) ) {
 730                         while ( $row = wfFetchObject( $res ) ) {
 731                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 732                                 $wgLinkCache->addGoodLink( $titleObj->getPrefixedDBkey(), $row->cur_id );
 733                                 $retVal[] = $titleObj;
 734                         }
 735                 }
 736                 wfFreeResult( $res );
 737                 return $retVal;
 738         }
 739
 740         function getSquidURLs() {
 741                 return array(
 742                         $this->getInternalURL(),
 743                         $this->getInternalURL( "action=history" )
 744                 );
 745         }
 746
 747         function moveNoAuth( &$nt ) {
 748                 return $this->moveTo( $nt, false );
 749         }
 750
 751         # Move a title to a new location
 752         # Returns true on success, message name on failure
 753         # auth indicates whether wgUser's permissions should be checked
 754         function moveTo( &$nt, $auth = true ) {
 755                 $fname = "Title::move";
 756                 $oldid = $this->getArticleID();
 757                 $newid = $nt->getArticleID();
 758
 759                 if( !$this or !$nt ) {
 760                         return "badtitletext";
 761                 }
 762
 763                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 764                         return "articleexists";
 765                 }
 766                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 767                          ( "" == $this->getDBkey() ) ||
 768                          ( "" != $this->getInterwiki() ) ||
 769                          ( !$oldid ) ||
 770                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 771                          ( "" == $nt->getDBkey() ) ||
 772                          ( "" != $nt->getInterwiki() ) ) {
 773                         return "badarticleerror";
 774                 }
 775
 776                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 777                         return "protectedpage";
 778                 }
 779
 780                 # The move is allowed only if (1) the target doesn't exist, or
 781                 # (2) the target is a redirect to the source, and has no history
 782                 # (so we can undo bad moves right after they're done).
 783
 784                 if ( 0 != $newid ) { # Target exists; check for validity
 785                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 786                                 return "articleexists";
 787                         }
 788                         $this->moveOverExistingRedirect( $nt );
 789                 } else { # Target didn't exist, do normal move.
 790                         $this->moveToNewTitle( $nt, $newid );
 791                 }
 792
 793                 # Update watchlists
 794
 795                 $oldnamespace = $this->getNamespace() & ~1;
 796                 $newnamespace = $nt->getNamespace() & ~1;
 797                 $oldtitle = $this->getDBkey();
 798                 $newtitle = $nt->getDBkey();
 799
 800                 if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
 801                         WatchedItem::duplicateEntries( $this, $nt );
 802                 }
 803
 804                 # Update search engine
 805                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 806                 $u->doUpdate();
 807                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
 808                 $u->doUpdate();
 809
 810                 return true;
 811         }
 812
 813         # Move page to title which is presently a redirect to the source page
 814
 815         /* private */ function moveOverExistingRedirect( &$nt )
 816         {
 817                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 818                 $fname = "Title::moveOverExistingRedirect";
 819                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 820
 821         $now = wfTimestampNow();
 822         $won = wfInvertTimestamp( $now );
 823                 $newid = $nt->getArticleID();
 824                 $oldid = $this->getArticleID();
 825
 826                 # Change the name of the target page:
 827                 wfUpdateArray(
 828                         /* table */ 'cur',
 829                         /* SET */ array(
 830                                 'cur_touched' => $now,
 831                                 'cur_namespace' => $nt->getNamespace(),
 832                                 'cur_title' => $nt->getDBkey()
 833                         ),
 834                         /* WHERE */ array( 'cur_id' => $oldid ),
 835                         $fname
 836                 );
 837                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 838
 839                 # Repurpose the old redirect. We don't save it to history since
 840                 # by definition if we've got here it's rather uninteresting.
 841
 842                 $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
 843                 wfUpdateArray(
 844                         /* table */ 'cur',
 845                         /* SET */ array(
 846                                 'cur_touched' => $now,
 847                                 'cur_timestamp' => $now,
 848                                 'inverse_timestamp' => $won,
 849                                 'cur_namespace' => $this->getNamespace(),
 850                                 'cur_title' => $this->getDBkey(),
 851                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
 852                                 'cur_comment' => $comment,
 853                                 'cur_user' => $wgUser->getID(),
 854                                 'cur_minor_edit' => 0,
 855                                 'cur_counter' => 0,
 856                                 'cur_restrictions' => '',
 857                                 'cur_user_text' => $wgUser->getName(),
 858                                 'cur_is_redirect' => 1,
 859                                 'cur_is_new' => 1
 860                         ),
 861                         /* WHERE */ array( 'cur_id' => $newid ),
 862                         $fname
 863                 );
 864
 865                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 866
 867                 # Fix the redundant names for the past revisions of the target page.
 868                 # The redirect should have no old revisions.
 869                 wfUpdateArray(
 870                         /* table */ 'old',
 871                         /* SET */ array(
 872                                 'old_namespace' => $nt->getNamespace(),
 873                                 'old_title' => $nt->getDBkey(),
 874                         ),
 875                         /* WHERE */ array(
 876                                 'old_namespace' => $this->getNamespace(),
 877                                 'old_title' => $this->getDBkey(),
 878                         ),
 879                         $fname
 880                 );
 881
 882                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 883
 884                 # Swap links
 885
 886                 # Load titles and IDs
 887                 $linksToOld = $this->getLinksTo();
 888                 $linksToNew = $nt->getLinksTo();
 889
 890                 # Make function to convert Titles to IDs
 891                 $titleToID = create_function('$t', 'return $t->getArticleID();');
 892
 893                 # Reassign links to old title
 894                 if ( count( $linksToOld ) ) {
 895                         $sql = "UPDATE links SET l_to=$newid WHERE l_from IN (";
 896                         $sql .= implode( ",", array_map( $titleToID, $linksToOld ) );
 897                         $sql .= ")";
 898                         wfQuery( $sql, DB_WRITE, $fname );
 899                 }
 900
 901                 # Reassign links to new title
 902                 if ( count( $linksToNew ) ) {
 903                         $sql = "UPDATE links SET l_to=$oldid WHERE l_from IN (";
 904                         $sql .= implode( ",", array_map( $titleToID, $linksToNew ) );
 905                         $sql .= ")";
 906                         wfQuery( $sql, DB_WRITE, $fname );
 907                 }
 908
 909                 # Note: the insert below must be after the updates above!
 910
 911                 # Now, we record the link from the redirect to the new title.
 912                 # It should have no other outgoing links...
 913                 $sql = "DELETE FROM links WHERE l_from={$newid}";
 914                 wfQuery( $sql, DB_WRITE, $fname );
 915                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 916                 wfQuery( $sql, DB_WRITE, $fname );
 917
 918                 # Purge squid
 919                 if ( $wgUseSquid ) {
 920                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
 921                         $u = new SquidUpdate( $urls );
 922                         $u->doUpdate();
 923                 }
 924         }
 925
 926         # Move page to non-existing title.
 927         # Sets $newid to be the new article ID
 928
 929         /* private */ function moveToNewTitle( &$nt, &$newid )
 930         {
 931                 global $wgUser, $wgLinkCache, $wgUseSquid;
 932                 $fname = "MovePageForm::moveToNewTitle";
 933                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 934
 935                 $now = wfTimestampNow();
 936                 $won = wfInvertTimestamp( $now );
 937                 $newid = $nt->getArticleID();
 938                 $oldid = $this->getArticleID();
 939
 940                 # Rename cur entry
 941                 wfUpdateArray(
 942                         /* table */ 'cur',
 943                         /* SET */ array(
 944                                 'cur_touched' => $now,
 945                                 'cur_namespace' => $nt->getNamespace(),
 946                                 'cur_title' => $nt->getDBkey()
 947                         ),
 948                         /* WHERE */ array( 'cur_id' => $oldid ),
 949                         $fname
 950                 );
 951
 952                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 953
 954                 # Insert redirct
 955                 wfInsertArray( 'cur', array(
 956                         'cur_namespace' => $this->getNamespace(),
 957                         'cur_title' => $this->getDBkey(),
 958                         'cur_comment' => $comment,
 959                         'cur_user' => $wgUser->getID(),
 960                         'cur_user_text' => $wgUser->getName(),
 961                         'cur_timestamp' => $now,
 962                         'inverse_timestamp' => $won,
 963                         'cur_touched' => $now,
 964                         'cur_is_redirect' => 1,
 965                         'cur_is_new' => 1,
 966                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
 967                 );
 968                 $newid = wfInsertId();
 969                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 970
 971                 # Rename old entries
 972                 wfUpdateArray(
 973                         /* table */ 'old',
 974                         /* SET */ array(
 975                                 'old_namespace' => $nt->getNamespace(),
 976                                 'old_title' => $nt->getDBkey()
 977                         ),
 978                         /* WHERE */ array(
 979                                 'old_namespace' => $this->getNamespace(),
 980                                 'old_title' => $this->getDBkey()
 981                         ), $fname
 982                 );
 983
 984                 # Miscellaneous updates
 985
 986                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 987                 Article::onArticleCreate( $nt );
 988
 989                 # Any text links to the old title must be reassigned to the redirect
 990                 $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
 991                 wfQuery( $sql, DB_WRITE, $fname );
 992
 993                 # Record the just-created redirect's linking to the page
 994                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 995                 wfQuery( $sql, DB_WRITE, $fname );
 996
 997                 # Non-existent target may have had broken links to it; these must
 998                 # now be removed and made into good links.
 999                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1000                 $update->fixBrokenLinks();
1001
1002                 # Purge old title from squid
1003                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1004                 $titles = $nt->getLinksTo();
1005                 if ( $wgUseSquid ) {
1006                         $urls = $this->getSquidURLs();
1007                         foreach ( $titles as $linkTitle ) {
1008                                 $urls[] = $linkTitle->getInternalURL();
1009                         }
1010                         $u = new SquidUpdate( $urls );
1011                         $u->doUpdate();
1012                 }
1013         }
1014
1015         # Checks if $this can be moved to $nt
1016         # Both titles must exist in the database, otherwise it will blow up
1017         function isValidMoveTarget( $nt )
1018         {
1019                 $fname = "Title::isValidMoveTarget";
1020
1021                 # Is it a redirect?
1022                 $id  = $nt->getArticleID();
1023                 $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
1024                   "WHERE cur_id={$id}";
1025                 $res = wfQuery( $sql, DB_READ, $fname );
1026                 $obj = wfFetchObject( $res );
1027
1028                 if ( 0 == $obj->cur_is_redirect ) {
1029                         # Not a redirect
1030                         return false;
1031                 }
1032
1033                 # Does the redirect point to the source?
1034                 if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
1035                         $redirTitle = Title::newFromText( $m[1] );
1036                         if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
1037                                 return false;
1038                         }
1039                 }
1040
1041                 # Does the article have a history?
1042                 $row = wfGetArray( 'old', array( 'old_id' ), array(
1043                         'old_namespace' => $nt->getNamespace(),
1044                         'old_title' => $nt->getDBkey() )
1045                 );
1046
1047                 # Return true if there was no history
1048                 return $row === false;
1049         }
1050
1051         # Create a redirect, fails if the title already exists, does not notify RC
1052         # Returns success
1053         function createRedirect( $dest, $comment ) {
1054                 global $wgUser;
1055                 if ( $this->getArticleID() ) {
1056                         return false;
1057                 }
1058
1059                 $now = wfTimestampNow();
1060                 $won = wfInvertTimestamp( $now );
1061
1062                 wfInsertArray( 'cur', array(
1063                         'cur_namespace' => $this->getNamespace(),
1064                         'cur_title' => $this->getDBkey(),
1065                         'cur_comment' => $comment,
1066                         'cur_user' => $wgUser->getID(),
1067                         'cur_user_text' => $wgUser->getName(),
1068                         'cur_timestamp' => $now,
1069                         'inverse_timestamp' => $won,
1070                         'cur_touched' => $now,
1071                         'cur_is_redirect' => 1,
1072                         'cur_is_new' => 1,
1073                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1074                 ));
1075                 $newid = wfInsertId();
1076                 $this->resetArticleID( $newid );
1077
1078                 # Link table
1079                 if ( $dest->getArticleID() ) {
1080                         wfInsertArray( 'links', array(
1081                                 'l_to' => $dest->getArticleID(),
1082                                 'l_from' => $newid
1083                         ));
1084                 } else {
1085                         wfInsertArray( 'brokenlinks', array(
1086                                 'bl_to' => $dest->getPrefixedDBkey(),
1087                                 'bl_from' => $newid
1088                         ));
1089                 }
1090
1091                 Article::onArticleCreate( $this );
1092                 return true;
1093         }
1094 }
1095 ?>