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