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