includes/Title.php

   1 <?php
   2 # See title.doc
   3
   4 /* private static */ $title_interwiki_cache = array();
   5
   6 # Title class
   7 #
   8 # * Represents a title, which may contain an interwiki designation or namespace
   9 # * Can fetch various kinds of data from the database, albeit inefficiently.
  10 #
  11 class Title {
  12         # All member variables should be considered private
  13         # Please use the accessor functions
  14
  15         var $mTextform;           # Text form (spaces not underscores) of the main part
  16         var $mUrlform;            # URL-encoded form of the main part
  17         var $mDbkeyform;          # Main part with underscores
  18         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  19         var $mInterwiki;          # Interwiki prefix (or null string)
  20         var $mFragment;           # Title fragment (i.e. the bit after the #)
  21         var $mArticleID;          # Article ID, fetched from the link cache on demand
  22         var $mRestrictions;       # Array of groups allowed to edit this article
  23                               # Only null or "sysop" are supported
  24         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  25         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  26         var $mDefaultNamespace;   # Namespace index when there is no namespace
  27                               # Zero except in {{transclusion}} tags
  28
  29 #----------------------------------------------------------------------------
  30 #   Construction
  31 #----------------------------------------------------------------------------
  32
  33         /* private */ function Title()
  34         {
  35                 $this->mInterwiki = $this->mUrlform =
  36                 $this->mTextform = $this->mDbkeyform = "";
  37                 $this->mArticleID = -1;
  38                 $this->mNamespace = 0;
  39                 $this->mRestrictionsLoaded = false;
  40                 $this->mRestrictions = array();
  41         $this->mDefaultNamespace = 0;
  42         }
  43
  44         # From a prefixed DB key
  45         /* static */ function newFromDBkey( $key )
  46         {
  47                 $t = new Title();
  48                 $t->mDbkeyform = $key;
  49                 if( $t->secureAndSplit() )
  50                         return $t;
  51                 else
  52                         return NULL;
  53         }
  54
  55         # From text, such as what you would find in a link
  56         /* static */ function newFromText( $text, $defaultNamespace = 0 )
  57         {
  58                 static $trans;
  59                 $fname = "Title::newFromText";
  60                 wfProfileIn( $fname );
  61
  62                 # Note - mixing latin1 named entities and unicode numbered
  63                 # ones will result in a bad link.
  64                 if( !isset( $trans ) ) {
  65                         global $wgInputEncoding;
  66                         $trans = array_flip( get_html_translation_table( HTML_ENTITIES ) );
  67                         if( strcasecmp( "utf-8", $wgInputEncoding ) == 0 ) {
  68                             $trans = array_map( "utf8_encode", $trans );
  69                         }
  70                 }
  71
  72                 if( is_object( $text ) ) {
  73                         wfDebugDieBacktrace( "Called with object instead of string." );
  74                 }
  75                 $text = strtr( $text, $trans );
  76
  77                 $text = wfMungeToUtf8( $text );
  78
  79
  80                 # What was this for? TS 2004-03-03
  81                 # $text = urldecode( $text );
  82
  83                 $t = new Title();
  84                 $t->mDbkeyform = str_replace( " ", "_", $text );
  85         $t->mDefaultNamespace = $defaultNamespace;
  86
  87                 wfProfileOut( $fname );
  88                 if( $t->secureAndSplit() ) {
  89                         return $t;
  90                 } else {
  91                         return NULL;
  92                 }
  93         }
  94
  95         # From a URL-encoded title
  96         /* static */ function newFromURL( $url )
  97         {
  98                 global $wgLang, $wgServer;
  99                 $t = new Title();
 100                 $s = urldecode( $url ); # This is technically wrong, as anything
 101                                                                 # we've gotten is already decoded by PHP.
 102                                                                 # Kept for backwards compatibility with
 103                                                                 # buggy URLs we had for a while...
 104                 $s = $url;
 105
 106                 # For links that came from outside, check for alternate/legacy
 107                 # character encoding.
 108                 wfDebug( "Servr: $wgServer\n" );
 109                 if( empty( $_SERVER["HTTP_REFERER"] ) ||
 110                         strncmp($wgServer, $_SERVER["HTTP_REFERER"], strlen( $wgServer ) ) )
 111                 {
 112                         $s = $wgLang->checkTitleEncoding( $s );
 113                 } else {
 114                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 115                 }
 116
 117                 $t->mDbkeyform = str_replace( " ", "_", $s );
 118                 if( $t->secureAndSplit() ) {
 119
 120                         # check that lenght of title is < cur_title size
 121                         $sql = "SHOW COLUMNS FROM cur LIKE \"cur_title\";";
 122                         $cur_title_object = wfFetchObject(wfQuery( $sql, DB_READ ));
 123
 124                         preg_match( "/\((.*)\)/", $cur_title_object->Type, $cur_title_size);
 125
 126                         if (strlen($t->mDbkeyform) > $cur_title_size[1] ) {
 127                                 return NULL;
 128                         }
 129
 130                         return $t;
 131                 } else {
 132                         return NULL;
 133                 }
 134         }
 135
 136         # From a cur_id
 137         # This is inefficiently implemented, the cur row is requested but not
 138         # used for anything else
 139         /* static */ function newFromID( $id )
 140         {
 141                 $fname = "Title::newFromID";
 142                 $row = wfGetArray( "cur", array( "cur_namespace", "cur_title" ),
 143                         array( "cur_id" => $id ), $fname );
 144                 if ( $row !== false ) {
 145                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 146                 } else {
 147                         $title = NULL;
 148                 }
 149                 return $title;
 150         }
 151
 152         # From a namespace index and a DB key
 153         /* static */ function makeTitle( $ns, $title )
 154         {
 155                 $t = new Title();
 156                 $t->mDbkeyform = Title::makeName( $ns, $title );
 157                 if( $t->secureAndSplit() ) {
 158                         return $t;
 159                 } else {
 160                         return NULL;
 161                 }
 162         }
 163
 164         function newMainPage()
 165         {
 166                 return Title::newFromText( wfMsg( "mainpage" ) );
 167         }
 168
 169 #----------------------------------------------------------------------------
 170 #       Static functions
 171 #----------------------------------------------------------------------------
 172
 173         # Get the prefixed DB key associated with an ID
 174         /* static */ function nameOf( $id )
 175         {
 176                 $sql = "SELECT cur_namespace,cur_title FROM cur WHERE " .
 177                   "cur_id={$id}";
 178                 $res = wfQuery( $sql, DB_READ, "Article::nameOf" );
 179                 if ( 0 == wfNumRows( $res ) ) { return NULL; }
 180
 181                 $s = wfFetchObject( $res );
 182                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 183                 return $n;
 184         }
 185
 186         # Get a regex character class describing the legal characters in a link
 187         /* static */ function legalChars()
 188         {
 189                 # Missing characters:
 190                 #  * []|# Needed for link syntax
 191                 #  * % and + are corrupted by Apache when they appear in the path
 192                 #
 193                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 194                 # this breaks interlanguage links
 195
 196                 $set = " !\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 197                 return $set;
 198         }
 199
 200         # Returns a stripped-down a title string ready for the search index
 201         # Takes a namespace index and a text-form main part
 202         /* static */ function indexTitle( $ns, $title )
 203         {
 204                 global $wgDBminWordLen, $wgLang;
 205
 206                 $lc = SearchEngine::legalSearchChars() . "&#;";
 207                 $t = $wgLang->stripForSearch( $title );
 208                 $t = preg_replace( "/[^{$lc}]+/", " ", $t );
 209                 $t = strtolower( $t );
 210
 211                 # Handle 's, s'
 212                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 213                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 214
 215                 $t = preg_replace( "/\\s+/", " ", $t );
 216
 217                 if ( $ns == Namespace::getImage() ) {
 218                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 219                 }
 220                 return trim( $t );
 221         }
 222
 223         # Make a prefixed DB key from a DB key and a namespace index
 224         /* static */ function makeName( $ns, $title )
 225         {
 226                 global $wgLang;
 227
 228                 $n = $wgLang->getNsText( $ns );
 229                 if ( "" == $n ) { return $title; }
 230                 else { return "{$n}:{$title}"; }
 231         }
 232
 233         # Arguably static
 234         # Returns the URL associated with an interwiki prefix
 235         # The URL contains $1, which is replaced by the title
 236         function getInterwikiLink( $key )
 237         {
 238                 global $wgMemc, $wgDBname, $title_interwiki_cache;
 239                 $k = "$wgDBname:interwiki:$key";
 240
 241                 if( array_key_exists( $k, $title_interwiki_cache ) )
 242                         return $title_interwiki_cache[$k]->iw_url;
 243
 244                 $s = $wgMemc->get( $k );
 245                 if( $s ) {
 246                         $title_interwiki_cache[$k] = $s;
 247                         return $s->iw_url;
 248                 }
 249                 $dkey = wfStrencode( $key );
 250                 $query = "SELECT iw_url FROM interwiki WHERE iw_prefix='$dkey'";
 251                 $res = wfQuery( $query, DB_READ, "Title::getInterwikiLink" );
 252                 if(!$res) return "";
 253
 254                 $s = wfFetchObject( $res );
 255                 if(!$s) {
 256                         $s = (object)false;
 257                         $s->iw_url = "";
 258                 }
 259                 $wgMemc->set( $k, $s );
 260                 $title_interwiki_cache[$k] = $s;
 261                 return $s->iw_url;
 262         }
 263
 264         # Update the cur_touched field for an array of title objects
 265         # Inefficient unless the IDs are already loaded into the link cache
 266         /* static */ function touchArray( $titles, $timestamp = "" ) {
 267                 if ( count( $titles ) == 0 ) {
 268                         return;
 269                 }
 270                 if ( $timestamp == "" ) {
 271                         $timestamp = wfTimestampNow();
 272                 }
 273                 $sql = "UPDATE cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 274                 $first = true;
 275
 276                 foreach ( $titles as $title ) {
 277                         if ( ! $first ) {
 278                                 $sql .= ",";
 279                         }
 280
 281                         $first = false;
 282                         $sql .= $title->getArticleID();
 283                 }
 284                 $sql .= ")";
 285                 if ( ! $first ) {
 286                         wfQuery( $sql, DB_WRITE, "Title::touchArray" );
 287                 }
 288         }
 289
 290 #----------------------------------------------------------------------------
 291 #       Other stuff
 292 #----------------------------------------------------------------------------
 293
 294         # Simple accessors
 295         # See the definitions at the top of this file
 296
 297         function getText() { return $this->mTextform; }
 298         function getPartialURL() { return $this->mUrlform; }
 299         function getDBkey() { return $this->mDbkeyform; }
 300         function getNamespace() { return $this->mNamespace; }
 301         function setNamespace( $n ) { $this->mNamespace = $n; }
 302         function getInterwiki() { return $this->mInterwiki; }
 303         function getFragment() { return $this->mFragment; }
 304         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 305
 306         # Get title for search index
 307         function getIndexTitle()
 308         {
 309                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 310         }
 311
 312         # Get prefixed title with underscores
 313         function getPrefixedDBkey()
 314         {
 315                 $s = $this->prefix( $this->mDbkeyform );
 316                 $s = str_replace( " ", "_", $s );
 317                 return $s;
 318         }
 319
 320         # Get prefixed title with spaces
 321         # This is the form usually used for display
 322         function getPrefixedText()
 323         {
 324                 if ( empty( $this->mPrefixedText ) ) {
 325                         $s = $this->prefix( $this->mTextform );
 326                         $s = str_replace( "_", " ", $s );
 327                         $this->mPrefixedText = $s;
 328                 }
 329                 return $this->mPrefixedText;
 330         }
 331
 332         # Get a URL-encoded title (not an actual URL) including interwiki
 333         function getPrefixedURL()
 334         {
 335                 $s = $this->prefix( $this->mDbkeyform );
 336                 $s = str_replace( " ", "_", $s );
 337
 338                 $s = wfUrlencode ( $s ) ;
 339
 340                 # Cleaning up URL to make it look nice -- is this safe?
 341                 $s = preg_replace( "/%3[Aa]/", ":", $s );
 342                 $s = preg_replace( "/%2[Ff]/", "/", $s );
 343                 $s = str_replace( "%28", "(", $s );
 344                 $s = str_replace( "%29", ")", $s );
 345
 346                 return $s;
 347         }
 348
 349         # Get a real URL referring to this title, with interwiki link and fragment
 350         function getFullURL( $query = "" )
 351         {
 352                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 353
 354                 if ( "" == $this->mInterwiki ) {
 355                         $p = $wgArticlePath;
 356                         return $wgServer . $this->getLocalUrl( $query );
 357                 }
 358
 359                 $p = $this->getInterwikiLink( $this->mInterwiki );
 360                 $n = $wgLang->getNsText( $this->mNamespace );
 361                 if ( "" != $n ) { $n .= ":"; }
 362                 $u = str_replace( "$1", $n . $this->mUrlform, $p );
 363                 if ( "" != $this->mFragment ) {
 364                         $u .= "#" . wfUrlencode( $this->mFragment );
 365                 }
 366                 return $u;
 367         }
 368
 369         # Get a URL with an optional query string, no fragment
 370         # * If $query=="", it will use $wgArticlePath
 371         # * Returns a full for an interwiki link, loses any query string
 372         # * Optionally adds the server and escapes for HTML
 373         # * Setting $query to "-" makes an old-style URL with nothing in the
 374         #   query except a title
 375
 376         function getURL() {
 377                 die( "Call to obsolete obsolete function Title::getURL()" );
 378         }
 379
 380         function getLocalURL( $query = "" )
 381         {
 382                 global $wgLang, $wgArticlePath, $wgScript;
 383
 384                 if ( $this->isExternal() ) {
 385                         return $this->getFullURL();
 386                 }
 387
 388                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 389                 if ( $query == "" ) {
 390                         $url = str_replace( "$1", $dbkey, $wgArticlePath );
 391                 } else {
 392                         if ( $query == "-" ) {
 393                                 $query = "";
 394                         }
 395                         if ( $wgScript != "" ) {
 396                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 397                         } else {
 398                                 # Top level wiki
 399                                 $url = "/{$dbkey}?{$query}";
 400                         }
 401                 }
 402                 return $url;
 403         }
 404
 405         function escapeLocalURL( $query = "" ) {
 406                 return wfEscapeHTML( $this->getLocalURL( $query ) );
 407         }
 408
 409         function escapeFullURL( $query = "" ) {
 410                 return wfEscapeHTML( $this->getFullURL( $query ) );
 411         }
 412
 413         function getInternalURL( $query = "" ) {
 414                 # Used in various Squid-related code, in case we have a different
 415                 # internal hostname for the server than the exposed one.
 416                 global $wgInternalServer;
 417                 return $wgInternalServer . $this->getLocalURL( $query );
 418         }
 419
 420         # Get the edit URL, or a null string if it is an interwiki link
 421         function getEditURL()
 422         {
 423                 global $wgServer, $wgScript;
 424
 425                 if ( "" != $this->mInterwiki ) { return ""; }
 426                 $s = $this->getLocalURL( "action=edit" );
 427
 428                 return $s;
 429         }
 430
 431         # Get HTML-escaped displayable text
 432         # For the title field in <a> tags
 433         function getEscapedText()
 434         {
 435                 return wfEscapeHTML( $this->getPrefixedText() );
 436         }
 437
 438         # Is the title interwiki?
 439         function isExternal() { return ( "" != $this->mInterwiki ); }
 440
 441         # Does the title correspond to a protected article?
 442         function isProtected()
 443         {
 444                 if ( -1 == $this->mNamespace ) { return true; }
 445                 $a = $this->getRestrictions();
 446                 if ( in_array( "sysop", $a ) ) { return true; }
 447                 return false;
 448         }
 449
 450         # Is the page a log page, i.e. one where the history is messed up by
 451         # LogPage.php? This used to be used for suppressing diff links in recent
 452         # changes, but now that's done by setting a flag in the recentchanges
 453         # table. Hence, this probably is no longer used.
 454         function isLog()
 455         {
 456                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 457                         return false;
 458                 }
 459                 if ( ( 0 == strcmp( wfMsg( "uploadlogpage" ), $this->mDbkeyform ) ) ||
 460                   ( 0 == strcmp( wfMsg( "dellogpage" ), $this->mDbkeyform ) ) ) {
 461                         return true;
 462                 }
 463                 return false;
 464         }
 465
 466         # Is $wgUser is watching this page?
 467         function userIsWatching()
 468         {
 469                 global $wgUser;
 470
 471                 if ( -1 == $this->mNamespace ) { return false; }
 472                 if ( 0 == $wgUser->getID() ) { return false; }
 473
 474                 return $wgUser->isWatched( $this );
 475         }
 476
 477         # Can $wgUser edit this page?
 478         function userCanEdit()
 479         {
 480                 global $wgUser;
 481
 482                 if ( -1 == $this->mNamespace ) { return false; }
 483                 # if ( 0 == $this->getArticleID() ) { return false; }
 484                 if ( $this->mDbkeyform == "_" ) { return false; }
 485
 486                 $ur = $wgUser->getRights();
 487                 foreach ( $this->getRestrictions() as $r ) {
 488                         if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
 489                                 return false;
 490                         }
 491                 }
 492                 return true;
 493         }
 494
 495         # Accessor/initialisation for mRestrictions
 496         function getRestrictions()
 497         {
 498                 $id = $this->getArticleID();
 499                 if ( 0 == $id ) { return array(); }
 500
 501                 if ( ! $this->mRestrictionsLoaded ) {
 502                         $res = wfGetSQL( "cur", "cur_restrictions", "cur_id=$id" );
 503                         $this->mRestrictions = explode( ",", trim( $res ) );
 504                         $this->mRestrictionsLoaded = true;
 505                 }
 506                 return $this->mRestrictions;
 507         }
 508
 509         # Is there a version of this page in the deletion archive?
 510         function isDeleted() {
 511                 $ns = $this->getNamespace();
 512                 $t = wfStrencode( $this->getDBkey() );
 513                 $sql = "SELECT COUNT(*) AS n FROM archive WHERE ar_namespace=$ns AND ar_title='$t'";
 514                 if( $res = wfQuery( $sql, DB_READ ) ) {
 515                         $s = wfFetchObject( $res );
 516                         return $s->n;
 517                 }
 518                 return 0;
 519         }
 520
 521         # Get the article ID from the link cache
 522         # Used very heavily, e.g. in Parser::replaceInternalLinks()
 523         function getArticleID()
 524         {
 525                 global $wgLinkCache;
 526
 527                 if ( -1 != $this->mArticleID ) { return $this->mArticleID; }
 528                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 529                 return $this->mArticleID;
 530         }
 531
 532         # This clears some fields in this object, and clears any associated keys in the
 533         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 534         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 535         function resetArticleID( $newid )
 536         {
 537                 global $wgLinkCache;
 538                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 539
 540                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 541                 else { $this->mArticleID = $newid; }
 542                 $this->mRestrictionsLoaded = false;
 543                 $this->mRestrictions = array();
 544         }
 545
 546         # Updates cur_touched
 547         # Called from LinksUpdate.php
 548         function invalidateCache() {
 549                 $now = wfTimestampNow();
 550                 $ns = $this->getNamespace();
 551                 $ti = wfStrencode( $this->getDBkey() );
 552                 $sql = "UPDATE cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";
 553                 return wfQuery( $sql, DB_WRITE, "Title::invalidateCache" );
 554         }
 555
 556         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 557         /* private */ function prefix( $name )
 558         {
 559                 global $wgLang;
 560
 561                 $p = "";
 562                 if ( "" != $this->mInterwiki ) {
 563                         $p = $this->mInterwiki . ":";
 564                 }
 565                 if ( 0 != $this->mNamespace ) {
 566                         $p .= $wgLang->getNsText( $this->mNamespace ) . ":";
 567                 }
 568                 return $p . $name;
 569         }
 570
 571         # Secure and split - main initialisation function for this object
 572         #
 573         # Assumes that mDbkeyform has been set, and is urldecoded
 574     # and uses undersocres, but not otherwise munged.  This function
 575     # removes illegal characters, splits off the winterwiki and
 576     # namespace prefixes, sets the other forms, and canonicalizes
 577     # everything.
 578         #
 579         /* private */ function secureAndSplit()
 580         {
 581                 global $wgLang, $wgLocalInterwiki;
 582                 $fname = "Title::secureAndSplit";
 583                 wfProfileIn( $fname );
 584
 585                 static $imgpre = false;
 586                 static $rxTc = false;
 587
 588                 # Initialisation
 589                 if ( $imgpre === false ) {
 590                         $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
 591                         $rxTc = "/[^" . Title::legalChars() . "]/";
 592                 }
 593
 594                 $this->mInterwiki = $this->mFragment = "";
 595                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 596
 597                 # Clean up whitespace
 598                 #
 599                 $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
 600                 if ( "_" == @$t{0} ) {
 601                         $t = substr( $t, 1 );
 602                 }
 603                 $l = strlen( $t );
 604                 if ( $l && ( "_" == $t{$l-1} ) ) {
 605                         $t = substr( $t, 0, $l-1 );
 606                 }
 607                 if ( "" == $t ) {
 608                         wfProfileOut( $fname );
 609                         return false;
 610                 }
 611
 612                 $this->mDbkeyform = $t;
 613                 $done = false;
 614
 615                 # :Image: namespace
 616                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 617                         $t = substr( $t, 1 );
 618                 }
 619
 620                 # Initial colon indicating main namespace
 621                 if ( ":" == $t{0} ) {
 622                         $r = substr( $t, 1 );
 623                         $this->mNamespace = NS_MAIN;
 624                 } else {
 625                         # Namespace or interwiki prefix
 626                         if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
 627                                 #$p = strtolower( $m[1] );
 628                                 $p = $m[1];
 629                                 if ( $ns = $wgLang->getNsIndex( strtolower( $p ) )) {
 630                                         # Ordinary namespace
 631                                         $t = $m[2];
 632                                         $this->mNamespace = $ns;
 633                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 634                                         # Interwiki link
 635                                         $t = $m[2];
 636                                         $this->mInterwiki = $p;
 637
 638                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 639                                                 $done = true;
 640                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 641                                                 $done = true;
 642                                         }
 643                                 }
 644                         }
 645                         $r = $t;
 646                 }
 647
 648                 # Redundant interwiki prefix to the local wiki
 649                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 650                         $this->mInterwiki = "";
 651                 }
 652                 # We already know that some pages won't be in the database!
 653                 #
 654                 if ( "" != $this->mInterwiki || -1 == $this->mNamespace ) {
 655                         $this->mArticleID = 0;
 656                 }
 657                 $f = strstr( $r, "#" );
 658                 if ( false !== $f ) {
 659                         $this->mFragment = substr( $f, 1 );
 660                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 661                 }
 662
 663                 # Reject illegal characters.
 664                 #
 665                 if( preg_match( $rxTc, $r ) ) {
 666                         return false;
 667                 }
 668
 669                 # "." and ".." conflict with the directories of those names
 670                 if ( $r === "." || $r === ".." ) {
 671                         return false;
 672                 }
 673
 674                 # Initial capital letter
 675                 if( $this->mInterwiki == "") $t = $wgLang->ucfirst( $r );
 676
 677                 # Fill fields
 678                 $this->mDbkeyform = $t;
 679                 $this->mUrlform = wfUrlencode( $t );
 680
 681                 $this->mTextform = str_replace( "_", " ", $t );
 682
 683                 wfProfileOut( $fname );
 684                 return true;
 685         }
 686
 687         # Get a title object associated with the talk page of this article
 688         function getTalkPage() {
 689                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 690         }
 691
 692         # Get a title object associated with the subject page of this talk page
 693         function getSubjectPage() {
 694                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 695         }
 696
 697         # Get an array of Title objects linking to this title
 698         # Also stores the IDs in the link cache
 699         function getLinksTo() {
 700                 global $wgLinkCache;
 701                 $id = $this->getArticleID();
 702                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
 703                 $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
 704                 $retVal = array();
 705                 if ( wfNumRows( $res ) ) {
 706                         while ( $row = wfFetchObject( $res ) ) {
 707                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 708                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 709                                 $retVal[] = $titleObj;
 710                         }
 711                 }
 712                 wfFreeResult( $res );
 713                 return $retVal;
 714         }
 715
 716         # Get an array of Title objects linking to this non-existent title
 717         # Also stores the IDs in the link cache
 718         function getBrokenLinksTo() {
 719                 global $wgLinkCache;
 720                 $encTitle = wfStrencode( $this->getPrefixedDBkey() );
 721                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
 722                   "WHERE bl_from=cur_id AND bl_to='$encTitle'";
 723                 $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
 724                 $retVal = array();
 725                 if ( wfNumRows( $res ) ) {
 726                         while ( $row = wfFetchObject( $res ) ) {
 727                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 728                                 $wgLinkCache->addGoodLink( $titleObj->getPrefixedDBkey(), $row->cur_id );
 729                                 $retVal[] = $titleObj;
 730                         }
 731                 }
 732                 wfFreeResult( $res );
 733                 return $retVal;
 734         }
 735
 736         function getSquidURLs() {
 737                 return array(
 738                         $this->getInternalURL(),
 739                         $this->getInternalURL( "action=history" )
 740                 );
 741         }
 742
 743         function moveNoAuth( &$nt ) {
 744                 return $this->moveTo( $nt, false );
 745         }
 746
 747         # Move a title to a new location
 748         # Returns true on success, message name on failure
 749         # auth indicates whether wgUser's permissions should be checked
 750         function moveTo( &$nt, $auth = true ) {
 751                 $fname = "Title::move";
 752                 $oldid = $this->getArticleID();
 753                 $newid = $nt->getArticleID();
 754
 755                 if( !$this or !$nt ) {
 756                         return "badtitletext";
 757                 }
 758
 759                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 760                         return "articleexists";
 761                 }
 762                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 763                          ( "" == $this->getDBkey() ) ||
 764                          ( "" != $this->getInterwiki() ) ||
 765                          ( !$oldid ) ||
 766                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 767                          ( "" == $nt->getDBkey() ) ||
 768                          ( "" != $nt->getInterwiki() ) ) {
 769                         return "badarticleerror";
 770                 }
 771
 772                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 773                         return "protectedpage";
 774                 }
 775
 776                 # The move is allowed only if (1) the target doesn't exist, or
 777                 # (2) the target is a redirect to the source, and has no history
 778                 # (so we can undo bad moves right after they're done).
 779
 780                 if ( 0 != $newid ) { # Target exists; check for validity
 781                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 782                                 return "articleexists";
 783                         }
 784                         $this->moveOverExistingRedirect( $nt );
 785                 } else { # Target didn't exist, do normal move.
 786                         $this->moveToNewTitle( $nt, $newid );
 787                 }
 788
 789                 # Update watchlists
 790
 791                 $oldnamespace = $this->getNamespace() & ~1;
 792                 $newnamespace = $nt->getNamespace() & ~1;
 793                 $oldtitle = $this->getDBkey();
 794                 $newtitle = $nt->getDBkey();
 795
 796                 if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
 797                         WatchedItem::duplicateEntries( $this, $nt );
 798                 }
 799
 800                 # Update search engine
 801                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 802                 $u->doUpdate();
 803                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
 804                 $u->doUpdate();
 805
 806                 return true;
 807         }
 808
 809         # Move page to title which is presently a redirect to the source page
 810
 811         /* private */ function moveOverExistingRedirect( &$nt )
 812         {
 813                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 814                 $fname = "Title::moveOverExistingRedirect";
 815                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 816
 817         $now = wfTimestampNow();
 818         $won = wfInvertTimestamp( $now );
 819                 $newid = $nt->getArticleID();
 820                 $oldid = $this->getArticleID();
 821
 822                 # Change the name of the target page:
 823                 wfUpdateArray(
 824                         /* table */ 'cur',
 825                         /* SET */ array(
 826                                 'cur_touched' => $now,
 827                                 'cur_namespace' => $nt->getNamespace(),
 828                                 'cur_title' => $nt->getDBkey()
 829                         ),
 830                         /* WHERE */ array( 'cur_id' => $oldid ),
 831                         $fname
 832                 );
 833                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 834
 835                 # Repurpose the old redirect. We don't save it to history since
 836                 # by definition if we've got here it's rather uninteresting.
 837
 838                 $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
 839                 wfUpdateArray(
 840                         /* table */ 'cur',
 841                         /* SET */ array(
 842                                 'cur_touched' => $now,
 843                                 'cur_timestamp' => $now,
 844                                 'inverse_timestamp' => $won,
 845                                 'cur_namespace' => $this->getNamespace(),
 846                                 'cur_title' => $this->getDBkey(),
 847                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
 848                                 'cur_comment' => $comment,
 849                                 'cur_user' => $wgUser->getID(),
 850                                 'cur_minor_edit' => 0,
 851                                 'cur_counter' => 0,
 852                                 'cur_restrictions' => '',
 853                                 'cur_user_text' => $wgUser->getName(),
 854                                 'cur_is_redirect' => 1,
 855                                 'cur_is_new' => 1
 856                         ),
 857                         /* WHERE */ array( 'cur_id' => $newid ),
 858                         $fname
 859                 );
 860
 861                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 862
 863                 # Fix the redundant names for the past revisions of the target page.
 864                 # The redirect should have no old revisions.
 865                 wfUpdateArray(
 866                         /* table */ 'old',
 867                         /* SET */ array(
 868                                 'old_namespace' => $nt->getNamespace(),
 869                                 'old_title' => $nt->getDBkey(),
 870                         ),
 871                         /* WHERE */ array(
 872                                 'old_namespace' => $this->getNamespace(),
 873                                 'old_title' => $this->getDBkey(),
 874                         ),
 875                         $fname
 876                 );
 877
 878                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 879
 880                 # Swap links
 881
 882                 # Load titles and IDs
 883                 $linksToOld = $this->getLinksTo();
 884                 $linksToNew = $nt->getLinksTo();
 885
 886                 # Make function to convert Titles to IDs
 887                 $titleToID = create_function('$t', 'return $t->getArticleID();');
 888
 889                 # Reassign links to old title
 890                 if ( count( $linksToOld ) ) {
 891                         $sql = "UPDATE links SET l_to=$newid WHERE l_from IN (";
 892                         $sql .= implode( ",", array_map( $titleToID, $linksToOld ) );
 893                         $sql .= ")";
 894                         wfQuery( $sql, DB_WRITE, $fname );
 895                 }
 896
 897                 # Reassign links to new title
 898                 if ( count( $linksToNew ) ) {
 899                         $sql = "UPDATE links SET l_to=$oldid WHERE l_from IN (";
 900                         $sql .= implode( ",", array_map( $titleToID, $linksToNew ) );
 901                         $sql .= ")";
 902                         wfQuery( $sql, DB_WRITE, $fname );
 903                 }
 904
 905                 # Note: the insert below must be after the updates above!
 906
 907                 # Now, we record the link from the redirect to the new title.
 908                 # It should have no other outgoing links...
 909                 $sql = "DELETE FROM links WHERE l_from={$newid}";
 910                 wfQuery( $sql, DB_WRITE, $fname );
 911                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 912                 wfQuery( $sql, DB_WRITE, $fname );
 913
 914                 # Purge squid
 915                 if ( $wgUseSquid ) {
 916                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
 917                         $u = new SquidUpdate( $urls );
 918                         $u->doUpdate();
 919                 }
 920         }
 921
 922         # Move page to non-existing title.
 923         # Sets $newid to be the new article ID
 924
 925         /* private */ function moveToNewTitle( &$nt, &$newid )
 926         {
 927                 global $wgUser, $wgLinkCache, $wgUseSquid;
 928                 $fname = "MovePageForm::moveToNewTitle";
 929                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 930
 931                 $now = wfTimestampNow();
 932                 $won = wfInvertTimestamp( $now );
 933                 $newid = $nt->getArticleID();
 934                 $oldid = $this->getArticleID();
 935
 936                 # Rename cur entry
 937                 wfUpdateArray(
 938                         /* table */ 'cur',
 939                         /* SET */ array(
 940                                 'cur_touched' => $now,
 941                                 'cur_namespace' => $nt->getNamespace(),
 942                                 'cur_title' => $nt->getDBkey()
 943                         ),
 944                         /* WHERE */ array( 'cur_id' => $oldid ),
 945                         $fname
 946                 );
 947
 948                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 949
 950                 # Insert redirct
 951                 wfInsertArray( 'cur', array(
 952                         'cur_namespace' => $this->getNamespace(),
 953                         'cur_title' => $this->getDBkey(),
 954                         'cur_comment' => $comment,
 955                         'cur_user' => $wgUser->getID(),
 956                         'cur_user_text' => $wgUser->getName(),
 957                         'cur_timestamp' => $now,
 958                         'inverse_timestamp' => $won,
 959                         'cur_touched' => $now,
 960                         'cur_is_redirect' => 1,
 961                         'cur_is_new' => 1,
 962                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
 963                 );
 964                 $newid = wfInsertId();
 965                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 966
 967                 # Rename old entries
 968                 wfUpdateArray(
 969                         /* table */ 'old',
 970                         /* SET */ array(
 971                                 'old_namespace' => $nt->getNamespace(),
 972                                 'old_title' => $nt->getDBkey()
 973                         ),
 974                         /* WHERE */ array(
 975                                 'old_namespace' => $this->getNamespace(),
 976                                 'old_title' => $this->getDBkey()
 977                         ), $fname
 978                 );
 979
 980                 # Miscellaneous updates
 981
 982                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 983                 Article::onArticleCreate( $nt );
 984
 985                 # Any text links to the old title must be reassigned to the redirect
 986                 $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
 987                 wfQuery( $sql, DB_WRITE, $fname );
 988
 989                 # Record the just-created redirect's linking to the page
 990                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 991                 wfQuery( $sql, DB_WRITE, $fname );
 992
 993                 # Non-existent target may have had broken links to it; these must
 994                 # now be removed and made into good links.
 995                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
 996                 $update->fixBrokenLinks();
 997
 998                 # Purge old title from squid
 999                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1000                 $titles = $nt->getLinksTo();
1001                 if ( $wgUseSquid ) {
1002                         $urls = $this->getSquidURLs();
1003                         foreach ( $titles as $linkTitle ) {
1004                                 $urls[] = $linkTitle->getInternalURL();
1005                         }
1006                         $u = new SquidUpdate( $urls );
1007                         $u->doUpdate();
1008                 }
1009         }
1010
1011         # Checks if $this can be moved to $nt
1012         # Both titles must exist in the database, otherwise it will blow up
1013         function isValidMoveTarget( $nt )
1014         {
1015                 $fname = "Title::isValidMoveTarget";
1016
1017                 # Is it a redirect?
1018                 $id  = $nt->getArticleID();
1019                 $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
1020                   "WHERE cur_id={$id}";
1021                 $res = wfQuery( $sql, DB_READ, $fname );
1022                 $obj = wfFetchObject( $res );
1023
1024                 if ( 0 == $obj->cur_is_redirect ) {
1025                         # Not a redirect
1026                         return false;
1027                 }
1028
1029                 # Does the redirect point to the source?
1030                 if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
1031                         $redirTitle = Title::newFromText( $m[1] );
1032                         if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
1033                                 return false;
1034                         }
1035                 }
1036
1037                 # Does the article have a history?
1038                 $row = wfGetArray( 'old', array( 'old_id' ), array(
1039                         'old_namespace' => $nt->getNamespace(),
1040                         'old_title' => $nt->getDBkey() )
1041                 );
1042
1043                 # Return true if there was no history
1044                 return $row === false;
1045         }
1046 }
1047 ?>