includes/Title.php

   1 <?php
   2 # See title.doc
   3
   4 $wgTitleInterwikiCache = array();
   5
   6 # Title class
   7 #
   8 # * Represents a title, which may contain an interwiki designation or namespace
   9 # * Can fetch various kinds of data from the database, albeit inefficiently.
  10 #
  11 class Title {
  12         # All member variables should be considered private
  13         # Please use the accessor functions
  14
  15         var $mTextform;           # Text form (spaces not underscores) of the main part
  16         var $mUrlform;            # URL-encoded form of the main part
  17         var $mDbkeyform;          # Main part with underscores
  18         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  19         var $mInterwiki;          # Interwiki prefix (or null string)
  20         var $mFragment;           # Title fragment (i.e. the bit after the #)
  21         var $mArticleID;          # Article ID, fetched from the link cache on demand
  22         var $mRestrictions;       # Array of groups allowed to edit this article
  23                               # Only null or "sysop" are supported
  24         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  25         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  26         var $mDefaultNamespace;   # Namespace index when there is no namespace
  27                               # Zero except in {{transclusion}} tags
  28
  29 #----------------------------------------------------------------------------
  30 #   Construction
  31 #----------------------------------------------------------------------------
  32
  33         /* private */ function Title()
  34         {
  35                 $this->mInterwiki = $this->mUrlform =
  36                 $this->mTextform = $this->mDbkeyform = "";
  37                 $this->mArticleID = -1;
  38                 $this->mNamespace = 0;
  39                 $this->mRestrictionsLoaded = false;
  40                 $this->mRestrictions = array();
  41         $this->mDefaultNamespace = 0;
  42         }
  43
  44         # From a prefixed DB key
  45         /* static */ function newFromDBkey( $key )
  46         {
  47                 $t = new Title();
  48                 $t->mDbkeyform = $key;
  49                 if( $t->secureAndSplit() )
  50                         return $t;
  51                 else
  52                         return NULL;
  53         }
  54
  55         # From text, such as what you would find in a link
  56         /* static */ function newFromText( $text, $defaultNamespace = 0 )
  57         {
  58                 $fname = "Title::newFromText";
  59                 wfProfileIn( $fname );
  60
  61                 if( is_object( $text ) ) {
  62                         wfDebugDieBacktrace( "Called with object instead of string." );
  63                 }
  64                 global $wgInputEncoding;
  65                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
  66
  67                 $text = wfMungeToUtf8( $text );
  68
  69
  70                 # What was this for? TS 2004-03-03
  71                 # $text = urldecode( $text );
  72
  73                 $t = new Title();
  74                 $t->mDbkeyform = str_replace( " ", "_", $text );
  75                 $t->mDefaultNamespace = $defaultNamespace;
  76
  77                 wfProfileOut( $fname );
  78                 if ( !is_object( $t ) ) {
  79                         var_dump( debug_backtrace() );
  80                 }
  81                 if( $t->secureAndSplit() ) {
  82                         return $t;
  83                 } else {
  84                         return NULL;
  85                 }
  86         }
  87
  88         # From a URL-encoded title
  89         /* static */ function newFromURL( $url )
  90         {
  91                 global $wgLang, $wgServer;
  92                 $t = new Title();
  93
  94                 # For compatibility with old buggy URLs. "+" is not valid in titles,
  95                 # but some URLs used it as a space replacement and they still come
  96                 # from some external search tools.
  97                 $s = str_replace( "+", " ", $url );
  98
  99                 # For links that came from outside, check for alternate/legacy
 100                 # character encoding.
 101                 wfDebug( "Servr: $wgServer\n" );
 102                 if( empty( $_SERVER["HTTP_REFERER"] ) ||
 103                         strncmp($wgServer, $_SERVER["HTTP_REFERER"], strlen( $wgServer ) ) )
 104                 {
 105                         $s = $wgLang->checkTitleEncoding( $s );
 106                 } else {
 107                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 108                 }
 109
 110                 $t->mDbkeyform = str_replace( " ", "_", $s );
 111                 if( $t->secureAndSplit() ) {
 112
 113                         # check that lenght of title is < cur_title size
 114                         $sql = "SHOW COLUMNS FROM cur LIKE \"cur_title\";";
 115                         $cur_title_object = wfFetchObject(wfQuery( $sql, DB_READ ));
 116
 117                         preg_match( "/\((.*)\)/", $cur_title_object->Type, $cur_title_size);
 118
 119                         if (strlen($t->mDbkeyform) > $cur_title_size[1] ) {
 120                                 return NULL;
 121                         }
 122
 123                         return $t;
 124                 } else {
 125                         return NULL;
 126                 }
 127         }
 128
 129         # From a cur_id
 130         # This is inefficiently implemented, the cur row is requested but not
 131         # used for anything else
 132         /* static */ function newFromID( $id )
 133         {
 134                 $fname = "Title::newFromID";
 135                 $row = wfGetArray( "cur", array( "cur_namespace", "cur_title" ),
 136                         array( "cur_id" => $id ), $fname );
 137                 if ( $row !== false ) {
 138                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 139                 } else {
 140                         $title = NULL;
 141                 }
 142                 return $title;
 143         }
 144
 145         # From a namespace index and a DB key
 146         /* static */ function makeTitle( $ns, $title )
 147         {
 148                 $t = new Title();
 149                 $t->mDbkeyform = Title::makeName( $ns, $title );
 150                 if( $t->secureAndSplit() ) {
 151                         return $t;
 152                 } else {
 153                         return NULL;
 154                 }
 155         }
 156
 157         function newMainPage()
 158         {
 159                 return Title::newFromText( wfMsg( "mainpage" ) );
 160         }
 161
 162 #----------------------------------------------------------------------------
 163 #       Static functions
 164 #----------------------------------------------------------------------------
 165
 166         # Get the prefixed DB key associated with an ID
 167         /* static */ function nameOf( $id )
 168         {
 169                 $sql = "SELECT cur_namespace,cur_title FROM cur WHERE " .
 170                   "cur_id={$id}";
 171                 $res = wfQuery( $sql, DB_READ, "Article::nameOf" );
 172                 if ( 0 == wfNumRows( $res ) ) { return NULL; }
 173
 174                 $s = wfFetchObject( $res );
 175                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 176                 return $n;
 177         }
 178
 179         # Get a regex character class describing the legal characters in a link
 180         /* static */ function legalChars()
 181         {
 182                 # Missing characters:
 183                 #  * []|# Needed for link syntax
 184                 #  * % and + are corrupted by Apache when they appear in the path
 185                 #  * % seems to work though
 186                 #
 187                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 188                 # this breaks interlanguage links
 189
 190                 $set = " %!\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 191                 return $set;
 192         }
 193
 194         # Returns a stripped-down a title string ready for the search index
 195         # Takes a namespace index and a text-form main part
 196         /* static */ function indexTitle( $ns, $title )
 197         {
 198                 global $wgDBminWordLen, $wgLang;
 199
 200                 $lc = SearchEngine::legalSearchChars() . "&#;";
 201                 $t = $wgLang->stripForSearch( $title );
 202                 $t = preg_replace( "/[^{$lc}]+/", " ", $t );
 203                 $t = strtolower( $t );
 204
 205                 # Handle 's, s'
 206                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 207                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 208
 209                 $t = preg_replace( "/\\s+/", " ", $t );
 210
 211                 if ( $ns == Namespace::getImage() ) {
 212                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 213                 }
 214                 return trim( $t );
 215         }
 216
 217         # Make a prefixed DB key from a DB key and a namespace index
 218         /* static */ function makeName( $ns, $title )
 219         {
 220                 global $wgLang;
 221
 222                 $n = $wgLang->getNsText( $ns );
 223                 if ( "" == $n ) { return $title; }
 224                 else { return "{$n}:{$title}"; }
 225         }
 226
 227         # Arguably static
 228         # Returns the URL associated with an interwiki prefix
 229         # The URL contains $1, which is replaced by the title
 230         function getInterwikiLink( $key )
 231         {
 232                 global $wgMemc, $wgDBname, $wgInterwikiExpiry;
 233                 static $wgTitleInterwikiCache = array();
 234
 235                 $k = "$wgDBname:interwiki:$key";
 236
 237                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 238                         return $wgTitleInterwikiCache[$k]->iw_url;
 239
 240                 $s = $wgMemc->get( $k );
 241                 # Ignore old keys with no iw_local
 242                 if( $s && isset( $s->iw_local ) ) {
 243                         $wgTitleInterwikiCache[$k] = $s;
 244                         return $s->iw_url;
 245                 }
 246                 $dkey = wfStrencode( $key );
 247                 $query = "SELECT iw_url,iw_local FROM interwiki WHERE iw_prefix='$dkey'";
 248                 $res = wfQuery( $query, DB_READ, "Title::getInterwikiLink" );
 249                 if(!$res) return "";
 250
 251                 $s = wfFetchObject( $res );
 252                 if(!$s) {
 253                         $s = (object)false;
 254                         $s->iw_url = "";
 255                 }
 256                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 257                 $wgTitleInterwikiCache[$k] = $s;
 258                 return $s->iw_url;
 259         }
 260
 261         function isLocal() {
 262                 global $wgTitleInterwikiCache, $wgDBname;
 263
 264                 if ( $this->mInterwiki != "" ) {
 265                         # Make sure key is loaded into cache
 266                         $this->getInterwikiLink( $this->mInterwiki );
 267                         $k = "$wgDBname:interwiki:" . $this->mInterwiki;
 268                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 269                 } else {
 270                         return true;
 271                 }
 272         }
 273
 274         # Update the cur_touched field for an array of title objects
 275         # Inefficient unless the IDs are already loaded into the link cache
 276         /* static */ function touchArray( $titles, $timestamp = "" ) {
 277                 if ( count( $titles ) == 0 ) {
 278                         return;
 279                 }
 280                 if ( $timestamp == "" ) {
 281                         $timestamp = wfTimestampNow();
 282                 }
 283                 $sql = "UPDATE cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 284                 $first = true;
 285
 286                 foreach ( $titles as $title ) {
 287                         if ( ! $first ) {
 288                                 $sql .= ",";
 289                         }
 290
 291                         $first = false;
 292                         $sql .= $title->getArticleID();
 293                 }
 294                 $sql .= ")";
 295                 if ( ! $first ) {
 296                         wfQuery( $sql, DB_WRITE, "Title::touchArray" );
 297                 }
 298         }
 299
 300 #----------------------------------------------------------------------------
 301 #       Other stuff
 302 #----------------------------------------------------------------------------
 303
 304         # Simple accessors
 305         # See the definitions at the top of this file
 306
 307         function getText() { return $this->mTextform; }
 308         function getPartialURL() { return $this->mUrlform; }
 309         function getDBkey() { return $this->mDbkeyform; }
 310         function getNamespace() { return $this->mNamespace; }
 311         function setNamespace( $n ) { $this->mNamespace = $n; }
 312         function getInterwiki() { return $this->mInterwiki; }
 313         function getFragment() { return $this->mFragment; }
 314         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 315
 316         # Get title for search index
 317         function getIndexTitle()
 318         {
 319                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 320         }
 321
 322         # Get prefixed title with underscores
 323         function getPrefixedDBkey()
 324         {
 325                 $s = $this->prefix( $this->mDbkeyform );
 326                 $s = str_replace( " ", "_", $s );
 327                 return $s;
 328         }
 329
 330         # Get prefixed title with spaces
 331         # This is the form usually used for display
 332         function getPrefixedText()
 333         {
 334                 if ( empty( $this->mPrefixedText ) ) {
 335                         $s = $this->prefix( $this->mTextform );
 336                         $s = str_replace( "_", " ", $s );
 337                         $this->mPrefixedText = $s;
 338                 }
 339                 return $this->mPrefixedText;
 340         }
 341
 342         # Get a URL-encoded title (not an actual URL) including interwiki
 343         function getPrefixedURL()
 344         {
 345                 $s = $this->prefix( $this->mDbkeyform );
 346                 $s = str_replace( " ", "_", $s );
 347
 348                 $s = wfUrlencode ( $s ) ;
 349
 350                 # Cleaning up URL to make it look nice -- is this safe?
 351                 $s = preg_replace( "/%3[Aa]/", ":", $s );
 352                 $s = preg_replace( "/%2[Ff]/", "/", $s );
 353                 $s = str_replace( "%28", "(", $s );
 354                 $s = str_replace( "%29", ")", $s );
 355
 356                 return $s;
 357         }
 358
 359         # Get a real URL referring to this title, with interwiki link and fragment
 360         function getFullURL( $query = "" )
 361         {
 362                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 363
 364                 if ( "" == $this->mInterwiki ) {
 365                         $p = $wgArticlePath;
 366                         return $wgServer . $this->getLocalUrl( $query );
 367                 }
 368
 369                 $p = $this->getInterwikiLink( $this->mInterwiki );
 370                 $n = $wgLang->getNsText( $this->mNamespace );
 371                 if ( "" != $n ) { $n .= ":"; }
 372                 $u = str_replace( "$1", $n . $this->mUrlform, $p );
 373                 if ( "" != $this->mFragment ) {
 374                         $u .= "#" . wfUrlencode( $this->mFragment );
 375                 }
 376                 return $u;
 377         }
 378
 379         # Get a URL with an optional query string, no fragment
 380         # * If $query=="", it will use $wgArticlePath
 381         # * Returns a full for an interwiki link, loses any query string
 382         # * Optionally adds the server and escapes for HTML
 383         # * Setting $query to "-" makes an old-style URL with nothing in the
 384         #   query except a title
 385
 386         function getURL() {
 387                 die( "Call to obsolete obsolete function Title::getURL()" );
 388         }
 389
 390         function getLocalURL( $query = "" )
 391         {
 392                 global $wgLang, $wgArticlePath, $wgScript;
 393
 394                 if ( $this->isExternal() ) {
 395                         return $this->getFullURL();
 396                 }
 397
 398                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 399                 if ( $query == "" ) {
 400                         $url = str_replace( "$1", $dbkey, $wgArticlePath );
 401                 } else {
 402                         if ( $query == "-" ) {
 403                                 $query = "";
 404                         }
 405                         if ( $wgScript != "" ) {
 406                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 407                         } else {
 408                                 # Top level wiki
 409                                 $url = "/{$dbkey}?{$query}";
 410                         }
 411                 }
 412                 return $url;
 413         }
 414
 415         function escapeLocalURL( $query = "" ) {
 416                 return wfEscapeHTML( $this->getLocalURL( $query ) );
 417         }
 418
 419         function escapeFullURL( $query = "" ) {
 420                 return wfEscapeHTML( $this->getFullURL( $query ) );
 421         }
 422
 423         function getInternalURL( $query = "" ) {
 424                 # Used in various Squid-related code, in case we have a different
 425                 # internal hostname for the server than the exposed one.
 426                 global $wgInternalServer;
 427                 return $wgInternalServer . $this->getLocalURL( $query );
 428         }
 429
 430         # Get the edit URL, or a null string if it is an interwiki link
 431         function getEditURL()
 432         {
 433                 global $wgServer, $wgScript;
 434
 435                 if ( "" != $this->mInterwiki ) { return ""; }
 436                 $s = $this->getLocalURL( "action=edit" );
 437
 438                 return $s;
 439         }
 440
 441         # Get HTML-escaped displayable text
 442         # For the title field in <a> tags
 443         function getEscapedText()
 444         {
 445                 return wfEscapeHTML( $this->getPrefixedText() );
 446         }
 447
 448         # Is the title interwiki?
 449         function isExternal() { return ( "" != $this->mInterwiki ); }
 450
 451         # Does the title correspond to a protected article?
 452         function isProtected()
 453         {
 454                 if ( -1 == $this->mNamespace ) { return true; }
 455                 $a = $this->getRestrictions();
 456                 if ( in_array( "sysop", $a ) ) { return true; }
 457                 return false;
 458         }
 459
 460         # Is the page a log page, i.e. one where the history is messed up by
 461         # LogPage.php? This used to be used for suppressing diff links in recent
 462         # changes, but now that's done by setting a flag in the recentchanges
 463         # table. Hence, this probably is no longer used.
 464         function isLog()
 465         {
 466                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 467                         return false;
 468                 }
 469                 if ( ( 0 == strcmp( wfMsg( "uploadlogpage" ), $this->mDbkeyform ) ) ||
 470                   ( 0 == strcmp( wfMsg( "dellogpage" ), $this->mDbkeyform ) ) ) {
 471                         return true;
 472                 }
 473                 return false;
 474         }
 475
 476         # Is $wgUser is watching this page?
 477         function userIsWatching()
 478         {
 479                 global $wgUser;
 480
 481                 if ( -1 == $this->mNamespace ) { return false; }
 482                 if ( 0 == $wgUser->getID() ) { return false; }
 483
 484                 return $wgUser->isWatched( $this );
 485         }
 486
 487         # Can $wgUser edit this page?
 488         function userCanEdit()
 489         {
 490                 global $wgUser;
 491                 if ( -1 == $this->mNamespace ) { return false; }
 492                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 493                 # if ( 0 == $this->getArticleID() ) { return false; }
 494                 if ( $this->mDbkeyform == "_" ) { return false; }
 495                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 496                 # protect css/js subpages of user pages
 497                 # XXX: this might be better using restrictions
 498                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 499                 if( Namespace::getUser() == $this->mNamespace
 500                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 501                         and !$wgUser->isSysop()
 502                         and !preg_match("/^".preg_quote($wgUser->getName(), '/')."/", $this->mTextform) )
 503                 { return false; }
 504                 $ur = $wgUser->getRights();
 505                 foreach ( $this->getRestrictions() as $r ) {
 506                         if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
 507                                 return false;
 508                         }
 509                 }
 510                 return true;
 511         }
 512
 513         function userCanRead() {
 514                 global $wgUser;
 515                 global $wgWhitelistRead;
 516
 517                 if( 0 != $wgUser->getID() ) return true;
 518                 if( !is_array( $wgWhitelistRead ) ) return true;
 519
 520                 $name = $this->getPrefixedText();
 521                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 522
 523                 # Compatibility with old settings
 524                 if( $this->getNamespace() == NS_ARTICLE ) {
 525                         if( in_array( ":" . $name, $wgWhitelistRead ) ) return true;
 526                 }
 527                 return false;
 528         }
 529
 530         function isCssJsSubpage() {
 531                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 532         }
 533         function isCssSubpage() {
 534                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 535         }
 536         function isJsSubpage() {
 537                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 538         }
 539         function userCanEditCssJsSubpage() {
 540                 # protect css/js subpages of user pages
 541                 # XXX: this might be better using restrictions
 542                 global $wgUser;
 543                 return ( $wgUser->isSysop() or preg_match("/^".preg_quote($wgUser->getName())."/", $this->mTextform) );
 544         }
 545
 546         # Accessor/initialisation for mRestrictions
 547         function getRestrictions()
 548         {
 549                 $id = $this->getArticleID();
 550                 if ( 0 == $id ) { return array(); }
 551
 552                 if ( ! $this->mRestrictionsLoaded ) {
 553                         $res = wfGetSQL( "cur", "cur_restrictions", "cur_id=$id" );
 554                         $this->mRestrictions = explode( ",", trim( $res ) );
 555                         $this->mRestrictionsLoaded = true;
 556                 }
 557                 return $this->mRestrictions;
 558         }
 559
 560         # Is there a version of this page in the deletion archive?
 561         function isDeleted() {
 562                 $ns = $this->getNamespace();
 563                 $t = wfStrencode( $this->getDBkey() );
 564                 $sql = "SELECT COUNT(*) AS n FROM archive WHERE ar_namespace=$ns AND ar_title='$t'";
 565                 if( $res = wfQuery( $sql, DB_READ ) ) {
 566                         $s = wfFetchObject( $res );
 567                         return $s->n;
 568                 }
 569                 return 0;
 570         }
 571
 572         # Get the article ID from the link cache
 573         # Used very heavily, e.g. in Parser::replaceInternalLinks()
 574         function getArticleID()
 575         {
 576                 global $wgLinkCache;
 577
 578                 if ( -1 != $this->mArticleID ) { return $this->mArticleID; }
 579                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 580                 return $this->mArticleID;
 581         }
 582
 583         # This clears some fields in this object, and clears any associated keys in the
 584         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 585         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 586         function resetArticleID( $newid )
 587         {
 588                 global $wgLinkCache;
 589                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 590
 591                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 592                 else { $this->mArticleID = $newid; }
 593                 $this->mRestrictionsLoaded = false;
 594                 $this->mRestrictions = array();
 595         }
 596
 597         # Updates cur_touched
 598         # Called from LinksUpdate.php
 599         function invalidateCache() {
 600                 $now = wfTimestampNow();
 601                 $ns = $this->getNamespace();
 602                 $ti = wfStrencode( $this->getDBkey() );
 603                 $sql = "UPDATE cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";
 604                 return wfQuery( $sql, DB_WRITE, "Title::invalidateCache" );
 605         }
 606
 607         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 608         /* private */ function prefix( $name )
 609         {
 610                 global $wgLang;
 611
 612                 $p = "";
 613                 if ( "" != $this->mInterwiki ) {
 614                         $p = $this->mInterwiki . ":";
 615                 }
 616                 if ( 0 != $this->mNamespace ) {
 617                         $p .= $wgLang->getNsText( $this->mNamespace ) . ":";
 618                 }
 619                 return $p . $name;
 620         }
 621
 622         # Secure and split - main initialisation function for this object
 623         #
 624         # Assumes that mDbkeyform has been set, and is urldecoded
 625     # and uses undersocres, but not otherwise munged.  This function
 626     # removes illegal characters, splits off the winterwiki and
 627     # namespace prefixes, sets the other forms, and canonicalizes
 628     # everything.
 629         #
 630         /* private */ function secureAndSplit()
 631         {
 632                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 633                 $fname = "Title::secureAndSplit";
 634                 wfProfileIn( $fname );
 635
 636                 static $imgpre = false;
 637                 static $rxTc = false;
 638
 639                 # Initialisation
 640                 if ( $imgpre === false ) {
 641                         $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
 642                         # % is needed as well
 643                         $rxTc = "/[^" . Title::legalChars() . "]/";
 644                 }
 645
 646                 $this->mInterwiki = $this->mFragment = "";
 647                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 648
 649                 # Clean up whitespace
 650                 #
 651                 $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
 652                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 653
 654                 if ( "" == $t ) {
 655                         wfProfileOut( $fname );
 656                         return false;
 657                 }
 658
 659                 $this->mDbkeyform = $t;
 660                 $done = false;
 661
 662                 # :Image: namespace
 663                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 664                         $t = substr( $t, 1 );
 665                 }
 666
 667                 # Initial colon indicating main namespace
 668                 if ( ":" == $t{0} ) {
 669                         $r = substr( $t, 1 );
 670                         $this->mNamespace = NS_MAIN;
 671                 } else {
 672                         # Namespace or interwiki prefix
 673                         if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
 674                                 #$p = strtolower( $m[1] );
 675                                 $p = $m[1];
 676                                 $lowerNs = strtolower( $p );
 677                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 678                                         # Canonical namespace
 679                                         $t = $m[2];
 680                                         $this->mNamespace = $ns;
 681                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 682                                         # Ordinary namespace
 683                                         $t = $m[2];
 684                                         $this->mNamespace = $ns;
 685                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 686                                         # Interwiki link
 687                                         $t = $m[2];
 688                                         $this->mInterwiki = $p;
 689
 690                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 691                                                 $done = true;
 692                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 693                                                 $done = true;
 694                                         }
 695                                 }
 696                         }
 697                         $r = $t;
 698                 }
 699
 700                 # Redundant interwiki prefix to the local wiki
 701                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 702                         $this->mInterwiki = "";
 703                 }
 704                 # We already know that some pages won't be in the database!
 705                 #
 706                 if ( "" != $this->mInterwiki || -1 == $this->mNamespace ) {
 707                         $this->mArticleID = 0;
 708                 }
 709                 $f = strstr( $r, "#" );
 710                 if ( false !== $f ) {
 711                         $this->mFragment = substr( $f, 1 );
 712                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 713                 }
 714
 715                 # Reject illegal characters.
 716                 #
 717                 if( preg_match( $rxTc, $r ) ) {
 718                         return false;
 719                 }
 720
 721                 # "." and ".." conflict with the directories of those namesa
 722                 if ( $r === "." || $r === ".." || strpos( $r, "./" ) !== false ) {
 723                         return false;
 724                 }
 725
 726                 # Initial capital letter
 727                 if( $wgCapitalLinks && $this->mInterwiki == "") {
 728                         $t = $wgLang->ucfirst( $r );
 729                 }
 730
 731                 # Fill fields
 732                 $this->mDbkeyform = $t;
 733                 $this->mUrlform = wfUrlencode( $t );
 734
 735                 $this->mTextform = str_replace( "_", " ", $t );
 736
 737                 wfProfileOut( $fname );
 738                 return true;
 739         }
 740
 741         # Get a title object associated with the talk page of this article
 742         function getTalkPage() {
 743                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 744         }
 745
 746         # Get a title object associated with the subject page of this talk page
 747         function getSubjectPage() {
 748                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 749         }
 750
 751         # Get an array of Title objects linking to this title
 752         # Also stores the IDs in the link cache
 753         function getLinksTo() {
 754                 global $wgLinkCache;
 755                 $id = $this->getArticleID();
 756                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
 757                 $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
 758                 $retVal = array();
 759                 if ( wfNumRows( $res ) ) {
 760                         while ( $row = wfFetchObject( $res ) ) {
 761                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
 762                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 763                                         $retVal[] = $titleObj;
 764                                 }
 765                         }
 766                 }
 767                 wfFreeResult( $res );
 768                 return $retVal;
 769         }
 770
 771         # Get an array of Title objects linking to this non-existent title
 772         # Also stores the IDs in the link cache
 773         function getBrokenLinksTo() {
 774                 global $wgLinkCache;
 775                 $encTitle = wfStrencode( $this->getPrefixedDBkey() );
 776                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
 777                   "WHERE bl_from=cur_id AND bl_to='$encTitle'";
 778                 $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
 779                 $retVal = array();
 780                 if ( wfNumRows( $res ) ) {
 781                         while ( $row = wfFetchObject( $res ) ) {
 782                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 783                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 784                                 $retVal[] = $titleObj;
 785                         }
 786                 }
 787                 wfFreeResult( $res );
 788                 return $retVal;
 789         }
 790
 791         function getSquidURLs() {
 792                 return array(
 793                         $this->getInternalURL(),
 794                         $this->getInternalURL( "action=history" )
 795                 );
 796         }
 797
 798         function moveNoAuth( &$nt ) {
 799                 return $this->moveTo( $nt, false );
 800         }
 801
 802         # Move a title to a new location
 803         # Returns true on success, message name on failure
 804         # auth indicates whether wgUser's permissions should be checked
 805         function moveTo( &$nt, $auth = true ) {
 806                 if( !$this or !$nt ) {
 807                         return "badtitletext";
 808                 }
 809
 810                 $fname = "Title::move";
 811                 $oldid = $this->getArticleID();
 812                 $newid = $nt->getArticleID();
 813
 814                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 815                         return "articleexists";
 816                 }
 817                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 818                          ( "" == $this->getDBkey() ) ||
 819                          ( "" != $this->getInterwiki() ) ||
 820                          ( !$oldid ) ||
 821                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 822                          ( "" == $nt->getDBkey() ) ||
 823                          ( "" != $nt->getInterwiki() ) ) {
 824                         return "badarticleerror";
 825                 }
 826
 827                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 828                         return "protectedpage";
 829                 }
 830
 831                 # The move is allowed only if (1) the target doesn't exist, or
 832                 # (2) the target is a redirect to the source, and has no history
 833                 # (so we can undo bad moves right after they're done).
 834
 835                 if ( 0 != $newid ) { # Target exists; check for validity
 836                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 837                                 return "articleexists";
 838                         }
 839                         $this->moveOverExistingRedirect( $nt );
 840                 } else { # Target didn't exist, do normal move.
 841                         $this->moveToNewTitle( $nt, $newid );
 842                 }
 843
 844                 # Update watchlists
 845
 846                 $oldnamespace = $this->getNamespace() & ~1;
 847                 $newnamespace = $nt->getNamespace() & ~1;
 848                 $oldtitle = $this->getDBkey();
 849                 $newtitle = $nt->getDBkey();
 850
 851                 if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
 852                         WatchedItem::duplicateEntries( $this, $nt );
 853                 }
 854
 855                 # Update search engine
 856                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 857                 $u->doUpdate();
 858                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
 859                 $u->doUpdate();
 860
 861                 return true;
 862         }
 863
 864         # Move page to title which is presently a redirect to the source page
 865
 866         /* private */ function moveOverExistingRedirect( &$nt )
 867         {
 868                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 869                 $fname = "Title::moveOverExistingRedirect";
 870                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 871
 872         $now = wfTimestampNow();
 873         $won = wfInvertTimestamp( $now );
 874                 $newid = $nt->getArticleID();
 875                 $oldid = $this->getArticleID();
 876
 877                 # Change the name of the target page:
 878                 wfUpdateArray(
 879                         /* table */ 'cur',
 880                         /* SET */ array(
 881                                 'cur_touched' => $now,
 882                                 'cur_namespace' => $nt->getNamespace(),
 883                                 'cur_title' => $nt->getDBkey()
 884                         ),
 885                         /* WHERE */ array( 'cur_id' => $oldid ),
 886                         $fname
 887                 );
 888                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 889
 890                 # Repurpose the old redirect. We don't save it to history since
 891                 # by definition if we've got here it's rather uninteresting.
 892
 893                 $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
 894                 wfUpdateArray(
 895                         /* table */ 'cur',
 896                         /* SET */ array(
 897                                 'cur_touched' => $now,
 898                                 'cur_timestamp' => $now,
 899                                 'inverse_timestamp' => $won,
 900                                 'cur_namespace' => $this->getNamespace(),
 901                                 'cur_title' => $this->getDBkey(),
 902                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
 903                                 'cur_comment' => $comment,
 904                                 'cur_user' => $wgUser->getID(),
 905                                 'cur_minor_edit' => 0,
 906                                 'cur_counter' => 0,
 907                                 'cur_restrictions' => '',
 908                                 'cur_user_text' => $wgUser->getName(),
 909                                 'cur_is_redirect' => 1,
 910                                 'cur_is_new' => 1
 911                         ),
 912                         /* WHERE */ array( 'cur_id' => $newid ),
 913                         $fname
 914                 );
 915
 916                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
 917
 918                 # Fix the redundant names for the past revisions of the target page.
 919                 # The redirect should have no old revisions.
 920                 wfUpdateArray(
 921                         /* table */ 'old',
 922                         /* SET */ array(
 923                                 'old_namespace' => $nt->getNamespace(),
 924                                 'old_title' => $nt->getDBkey(),
 925                         ),
 926                         /* WHERE */ array(
 927                                 'old_namespace' => $this->getNamespace(),
 928                                 'old_title' => $this->getDBkey(),
 929                         ),
 930                         $fname
 931                 );
 932
 933                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
 934
 935                 # Swap links
 936
 937                 # Load titles and IDs
 938                 $linksToOld = $this->getLinksTo();
 939                 $linksToNew = $nt->getLinksTo();
 940
 941                 # Delete them all
 942                 $sql = "DELETE FROM links WHERE l_to=$oldid OR l_to=$newid";
 943                 wfQuery( $sql, DB_WRITE, $fname );
 944
 945                 # Reinsert
 946                 if ( count( $linksToOld ) || count( $linksToNew )) {
 947                         $sql = "INSERT INTO links (l_from,l_to) VALUES ";
 948                         $first = true;
 949
 950                         # Insert links to old title
 951                         foreach ( $linksToOld as $linkTitle ) {
 952                                 if ( $first ) {
 953                                         $first = false;
 954                                 } else {
 955                                         $sql .= ",";
 956                                 }
 957                                 $id = $linkTitle->getArticleID();
 958                                 $sql .= "($id,$newid)";
 959                         }
 960
 961                         # Insert links to new title
 962                         foreach ( $linksToNew as $linkTitle ) {
 963                                 if ( $first ) {
 964                                         $first = false;
 965                                 } else {
 966                                         $sql .= ",";
 967                                 }
 968                                 $id = $linkTitle->getArticleID();
 969                                 $sql .= "($id, $oldid)";
 970                         }
 971
 972                         wfQuery( $sql, DB_WRITE, $fname );
 973                 }
 974
 975                 # Now, we record the link from the redirect to the new title.
 976                 # It should have no other outgoing links...
 977                 $sql = "DELETE FROM links WHERE l_from={$newid}";
 978                 wfQuery( $sql, DB_WRITE, $fname );
 979                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
 980                 wfQuery( $sql, DB_WRITE, $fname );
 981
 982                 # Purge squid
 983                 if ( $wgUseSquid ) {
 984                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
 985                         $u = new SquidUpdate( $urls );
 986                         $u->doUpdate();
 987                 }
 988         }
 989
 990         # Move page to non-existing title.
 991         # Sets $newid to be the new article ID
 992
 993         /* private */ function moveToNewTitle( &$nt, &$newid )
 994         {
 995                 global $wgUser, $wgLinkCache, $wgUseSquid;
 996                 $fname = "MovePageForm::moveToNewTitle";
 997                 $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
 998
 999                 $now = wfTimestampNow();
1000                 $won = wfInvertTimestamp( $now );
1001                 $newid = $nt->getArticleID();
1002                 $oldid = $this->getArticleID();
1003
1004                 # Rename cur entry
1005                 wfUpdateArray(
1006                         /* table */ 'cur',
1007                         /* SET */ array(
1008                                 'cur_touched' => $now,
1009                                 'cur_namespace' => $nt->getNamespace(),
1010                                 'cur_title' => $nt->getDBkey()
1011                         ),
1012                         /* WHERE */ array( 'cur_id' => $oldid ),
1013                         $fname
1014                 );
1015
1016                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1017
1018                 # Insert redirct
1019                 wfInsertArray( 'cur', array(
1020                         'cur_namespace' => $this->getNamespace(),
1021                         'cur_title' => $this->getDBkey(),
1022                         'cur_comment' => $comment,
1023                         'cur_user' => $wgUser->getID(),
1024                         'cur_user_text' => $wgUser->getName(),
1025                         'cur_timestamp' => $now,
1026                         'inverse_timestamp' => $won,
1027                         'cur_touched' => $now,
1028                         'cur_is_redirect' => 1,
1029                         'cur_is_new' => 1,
1030                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
1031                 );
1032                 $newid = wfInsertId();
1033                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1034
1035                 # Rename old entries
1036                 wfUpdateArray(
1037                         /* table */ 'old',
1038                         /* SET */ array(
1039                                 'old_namespace' => $nt->getNamespace(),
1040                                 'old_title' => $nt->getDBkey()
1041                         ),
1042                         /* WHERE */ array(
1043                                 'old_namespace' => $this->getNamespace(),
1044                                 'old_title' => $this->getDBkey()
1045                         ), $fname
1046                 );
1047
1048                 # Miscellaneous updates
1049
1050                 RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
1051                 Article::onArticleCreate( $nt );
1052
1053                 # Any text links to the old title must be reassigned to the redirect
1054                 $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
1055                 wfQuery( $sql, DB_WRITE, $fname );
1056
1057                 # Record the just-created redirect's linking to the page
1058                 $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
1059                 wfQuery( $sql, DB_WRITE, $fname );
1060
1061                 # Non-existent target may have had broken links to it; these must
1062                 # now be removed and made into good links.
1063                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1064                 $update->fixBrokenLinks();
1065
1066                 # Purge old title from squid
1067                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1068                 $titles = $nt->getLinksTo();
1069                 if ( $wgUseSquid ) {
1070                         $urls = $this->getSquidURLs();
1071                         foreach ( $titles as $linkTitle ) {
1072                                 $urls[] = $linkTitle->getInternalURL();
1073                         }
1074                         $u = new SquidUpdate( $urls );
1075                         $u->doUpdate();
1076                 }
1077         }
1078
1079         # Checks if $this can be moved to $nt
1080         # Both titles must exist in the database, otherwise it will blow up
1081         function isValidMoveTarget( $nt )
1082         {
1083                 $fname = "Title::isValidMoveTarget";
1084
1085                 # Is it a redirect?
1086                 $id  = $nt->getArticleID();
1087                 $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
1088                   "WHERE cur_id={$id}";
1089                 $res = wfQuery( $sql, DB_READ, $fname );
1090                 $obj = wfFetchObject( $res );
1091
1092                 if ( 0 == $obj->cur_is_redirect ) {
1093                         # Not a redirect
1094                         return false;
1095                 }
1096
1097                 # Does the redirect point to the source?
1098                 if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
1099                         $redirTitle = Title::newFromText( $m[1] );
1100                         if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
1101                                 return false;
1102                         }
1103                 }
1104
1105                 # Does the article have a history?
1106                 $row = wfGetArray( 'old', array( 'old_id' ), array(
1107                         'old_namespace' => $nt->getNamespace(),
1108                         'old_title' => $nt->getDBkey() )
1109                 );
1110
1111                 # Return true if there was no history
1112                 return $row === false;
1113         }
1114
1115         # Create a redirect, fails if the title already exists, does not notify RC
1116         # Returns success
1117         function createRedirect( $dest, $comment ) {
1118                 global $wgUser;
1119                 if ( $this->getArticleID() ) {
1120                         return false;
1121                 }
1122
1123                 $now = wfTimestampNow();
1124                 $won = wfInvertTimestamp( $now );
1125
1126                 wfInsertArray( 'cur', array(
1127                         'cur_namespace' => $this->getNamespace(),
1128                         'cur_title' => $this->getDBkey(),
1129                         'cur_comment' => $comment,
1130                         'cur_user' => $wgUser->getID(),
1131                         'cur_user_text' => $wgUser->getName(),
1132                         'cur_timestamp' => $now,
1133                         'inverse_timestamp' => $won,
1134                         'cur_touched' => $now,
1135                         'cur_is_redirect' => 1,
1136                         'cur_is_new' => 1,
1137                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1138                 ));
1139                 $newid = wfInsertId();
1140                 $this->resetArticleID( $newid );
1141
1142                 # Link table
1143                 if ( $dest->getArticleID() ) {
1144                         wfInsertArray( 'links', array(
1145                                 'l_to' => $dest->getArticleID(),
1146                                 'l_from' => $newid
1147                         ));
1148                 } else {
1149                         wfInsertArray( 'brokenlinks', array(
1150                                 'bl_to' => $dest->getPrefixedDBkey(),
1151                                 'bl_from' => $newid
1152                         ));
1153                 }
1154
1155                 Article::onArticleCreate( $this );
1156                 return true;
1157         }
1158
1159 }
1160 ?>