includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 if ( !class_exists( 'UtfNormal' ) ) {
   8         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9 }
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13
  14 /**
  15  * Constants for pr_cascade bitfield
  16  */
  17 define( 'CASCADE', 1 );
  18
  19 /**
  20  * Represents a title within MediaWiki.
  21  * Optionally may contain an interwiki designation or namespace.
  22  * @note This class can fetch various kinds of data from the database;
  23  *       however, it does so inefficiently.
  24  */
  25 class Title {
  26         /** @name Static cache variables */
  27         //@{
  28         static private $titleCache=array();
  29         static private $interwikiCache=array();
  30         //@}
  31
  32         /**
  33          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  34          * commonly used titles. On a batch operation this can become a memory leak
  35          * if not bounded. After hitting this many titles reset the cache.
  36          */
  37         const CACHE_MAX = 1000;
  38
  39
  40         /**
  41          * @name Private member variables
  42          * Please use the accessor functions instead.
  43          * @private
  44          */
  45         //@{
  46
  47         var $mTextform = '';              ///< Text form (spaces not underscores) of the main part
  48         var $mUrlform = '';               ///< URL-encoded form of the main part
  49         var $mDbkeyform = '';             ///< Main part with underscores
  50         var $mUserCaseDBKey;              ///< DB key with the initial letter in the case specified by the user
  51         var $mNamespace = NS_MAIN;        ///< Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki = '';             ///< Interwiki prefix (or null string)
  53         var $mFragment;                   ///< Title fragment (i.e. the bit after the #)
  54         var $mArticleID = -1;             ///< Article ID, fetched from the link cache on demand
  55         var $mLatestID = false;           ///< ID of most recent revision
  56         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  57         var $mOldRestrictions = false;
  58         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  59         var $mRestrictionsExpiry = array();       ///< When do the restrictions on this page expire?
  60         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  61         var $mCascadeSources;  ///< Where are the cascading restrictions coming from on this page?
  62         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  63         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  64         # Don't change the following default, NS_MAIN is hardcoded in several
  65         # places.  See bug 696.
  66         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  67                                           # Zero except in {{transclusion}} tags
  68         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  69         var $mLength = -1;                ///< The page length, 0 for special pages
  70         var $mRedirect = null;            ///< Is the article at this title a redirect?
  71         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  72         //@}
  73
  74
  75         /**
  76          * Constructor
  77          * @private
  78          */
  79         /* private */ function __construct() {}
  80
  81         /**
  82          * Create a new Title from a prefixed DB key
  83          * @param $key \type{\string} The database key, which has underscores
  84          *      instead of spaces, possibly including namespace and
  85          *      interwiki prefixes
  86          * @return \type{Title} the new object, or NULL on an error
  87          */
  88         public static function newFromDBkey( $key ) {
  89                 $t = new Title();
  90                 $t->mDbkeyform = $key;
  91                 if( $t->secureAndSplit() )
  92                         return $t;
  93                 else
  94                         return NULL;
  95         }
  96
  97         /**
  98          * Create a new Title from text, such as what one would find in a link. De-
  99          * codes any HTML entities in the text.
 100          *
 101          * @param $text             string  The link text; spaces, prefixes, and an
 102          *   initial ':' indicating the main namespace are accepted.
 103          * @param $defaultNamespace int     The namespace to use if none is speci-
 104          *   fied by a prefix.  If you want to force a specific namespace even if
 105          *   $text might begin with a namespace prefix, use makeTitle() or
 106          *   makeTitleSafe().
 107          * @return Title  The new object, or null on an error.
 108          */
 109         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 110                 if( is_object( $text ) ) {
 111                         throw new MWException( 'Title::newFromText given an object' );
 112                 }
 113
 114                 /**
 115                  * Wiki pages often contain multiple links to the same page.
 116                  * Title normalization and parsing can become expensive on
 117                  * pages with many links, so we can save a little time by
 118                  * caching them.
 119                  *
 120                  * In theory these are value objects and won't get changed...
 121                  */
 122                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 123                         return Title::$titleCache[$text];
 124                 }
 125
 126                 /**
 127                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 128                  */
 129                 $filteredText = Sanitizer::decodeCharReferences( $text );
 130
 131                 $t = new Title();
 132                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 133                 $t->mDefaultNamespace = $defaultNamespace;
 134
 135                 static $cachedcount = 0 ;
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( $cachedcount >= self::CACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         Title::$titleCache = array();
 141                                         $cachedcount=0;
 142                                 }
 143                                 $cachedcount++;
 144                                 Title::$titleCache[$text] =& $t;
 145                         }
 146                         return $t;
 147                 } else {
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param $url \type{\string} the title, as might be taken from a URL
 157          * @return \type{Title} the new object, or NULL on an error
 158          */
 159         public static function newFromURL( $url ) {
 160                 global $wgLegalTitleChars;
 161                 $t = new Title();
 162
 163                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 164                 # but some URLs used it as a space replacement and they still come
 165                 # from some external search tools.
 166                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 167                         $url = str_replace( '+', ' ', $url );
 168                 }
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param $id \type{\int} the page_id corresponding to the Title to create
 185          * @param $flags \type{\int} use GAID_FOR_UPDATE to use master
 186          * @return \type{Title} the new object, or NULL on an error
 187          */
 188         public static function newFromID( $id, $flags = 0 ) {
 189                 $fname = 'Title::newFromID';
 190                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 191                 $row = $db->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 192                         array( 'page_id' => $id ), $fname );
 193                 if ( $row !== false ) {
 194                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 195                 } else {
 196                         $title = NULL;
 197                 }
 198                 return $title;
 199         }
 200
 201         /**
 202          * Make an array of titles from an array of IDs
 203          * @param $ids \type{\arrayof{\int}} Array of IDs
 204          * @return \type{\arrayof{Title}} Array of Titles
 205          */
 206         public static function newFromIDs( $ids ) {
 207                 if ( !count( $ids ) ) {
 208                         return array();
 209                 }
 210                 $dbr = wfGetDB( DB_SLAVE );
 211                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 212                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 213
 214                 $titles = array();
 215                 foreach( $res as $row ) {
 216                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 217                 }
 218                 return $titles;
 219         }
 220
 221         /**
 222          * Make a Title object from a DB row
 223          * @param $row \type{Row} (needs at least page_title,page_namespace)
 224          * @return \type{Title} corresponding Title
 225          */
 226         public static function newFromRow( $row ) {
 227                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 228
 229                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 230                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 231                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 232                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 233
 234                 return $t;
 235         }
 236
 237         /**
 238          * Create a new Title from a namespace index and a DB key.
 239          * It's assumed that $ns and $title are *valid*, for instance when
 240          * they came directly from the database or a special page name.
 241          * For convenience, spaces are converted to underscores so that
 242          * eg user_text fields can be used directly.
 243          *
 244          * @param $ns \type{\int} the namespace of the article
 245          * @param $title \type{\string} the unprefixed database key form
 246          * @param $fragment \type{\string} The link fragment (after the "#")
 247          * @return \type{Title} the new object
 248          */
 249         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 250                 $t = new Title();
 251                 $t->mInterwiki = '';
 252                 $t->mFragment = $fragment;
 253                 $t->mNamespace = $ns = intval( $ns );
 254                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 255                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 256                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 257                 $t->mTextform = str_replace( '_', ' ', $title );
 258                 return $t;
 259         }
 260
 261         /**
 262          * Create a new Title from a namespace index and a DB key.
 263          * The parameters will be checked for validity, which is a bit slower
 264          * than makeTitle() but safer for user-provided data.
 265          *
 266          * @param $ns \type{\int} the namespace of the article
 267          * @param $title \type{\string} the database key form
 268          * @param $fragment \type{\string} The link fragment (after the "#")
 269          * @return \type{Title} the new object, or NULL on an error
 270          */
 271         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 272                 $t = new Title();
 273                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 274                 if( $t->secureAndSplit() ) {
 275                         return $t;
 276                 } else {
 277                         return NULL;
 278                 }
 279         }
 280
 281         /**
 282          * Create a new Title for the Main Page
 283          * @return \type{Title} the new object
 284          */
 285         public static function newMainPage() {
 286                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 287                 // Don't give fatal errors if the message is broken
 288                 if ( !$title ) {
 289                         $title = Title::newFromText( 'Main Page' );
 290                 }
 291                 return $title;
 292         }
 293
 294         /**
 295          * Extract a redirect destination from a string and return the
 296          * Title, or null if the text doesn't contain a valid redirect
 297          *
 298          * @param $text \type{\string} Text with possible redirect
 299          * @param $getAllTargets \type{\bool} Should we get an array of every target or just the final one?
 300          * @param $noRecurse \type{\bool} This will prevent any and all recursion, only getting the very next target
 301          *      This is mainly meant for Article::insertRedirect so that the redirect table still works properly
 302          *      (makes double redirect and broken redirect reports display accurate results).
 303          * @return \type{Title} The corresponding Title
 304          * @return \type{\array} Array of redirect targets (Title objects), with the destination being last
 305          */
 306         public static function newFromRedirect( $text, $getAllTargets = false, $noRecurse = false ) {
 307                 global $wgMaxRedirects;
 308                 // are redirects disabled?
 309                 // Note that we should get a Title object if possible if $noRecurse is true so that the redirect table functions properly
 310                 if( !$noRecurse && $wgMaxRedirects < 1 )
 311                         return null;
 312                 $redir = MagicWord::get( 'redirect' );
 313                 $text = trim($text);
 314                 if( $redir->matchStartAndRemove( $text ) ) {
 315                         // Extract the first link and see if it's usable
 316                         // Ensure that it really does come directly after #REDIRECT
 317                         // Some older redirects included a colon, so don't freak about that!
 318                         $m = array();
 319                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 320                                 // Strip preceding colon used to "escape" categories, etc.
 321                                 // and URL-decode links
 322                                 if( strpos( $m[1], '%' ) !== false ) {
 323                                         // Match behavior of inline link parsing here;
 324                                         // don't interpret + as " " most of the time!
 325                                         // It might be safe to just use rawurldecode instead, though.
 326                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 327                                 }
 328                                 $title = Title::newFromText( $m[1] );
 329                                 // If the initial title is a redirect to bad special pages or is invalid, quit early
 330                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 331                                         return null;
 332                                 }
 333                                 // If $noRecurse is true, simply return here
 334                                 if( $noRecurse ) {
 335                                         return $title;
 336                                 }
 337                                 // recursive check to follow double redirects
 338                                 $recurse = $wgMaxRedirects;
 339                                 $targets = array();
 340                                 while( --$recurse >= 0 ) {
 341                                         // Redirects to some special pages are not permitted
 342                                         if( $title instanceof Title && $title->isValidRedirectTarget() ) {
 343                                                 $targets[] = $title;
 344                                                 if( $title->isRedirect() ) {
 345                                                         $article = new Article( $title, 0 );
 346                                                         $title = $article->getRedirectTarget();
 347                                                 } else {
 348                                                         break;
 349                                                 }
 350                                         } else {
 351                                                 break;
 352                                         }
 353                                 }
 354                                 if( $getAllTargets ) {
 355                                         // return every target or null if no targets due to invalid title or whatever
 356                                         return ( $targets === array() ) ? null : $targets;
 357                                 } else {
 358                                         // return the final destination -- invalid titles are checked earlier
 359                                         return $title;
 360                                 }
 361                         }
 362                 }
 363                 return null;
 364         }
 365
 366 #----------------------------------------------------------------------------
 367 #       Static functions
 368 #----------------------------------------------------------------------------
 369
 370         /**
 371          * Get the prefixed DB key associated with an ID
 372          * @param $id \type{\int} the page_id of the article
 373          * @return \type{Title} an object representing the article, or NULL
 374          *      if no such article was found
 375          */
 376         public static function nameOf( $id ) {
 377                 $dbr = wfGetDB( DB_SLAVE );
 378
 379                 $s = $dbr->selectRow( 'page',
 380                         array( 'page_namespace','page_title' ),
 381                         array( 'page_id' => $id ),
 382                         __METHOD__ );
 383                 if ( $s === false ) { return NULL; }
 384
 385                 $n = self::makeName( $s->page_namespace, $s->page_title );
 386                 return $n;
 387         }
 388
 389         /**
 390          * Get a regex character class describing the legal characters in a link
 391          * @return \type{\string} the list of characters, not delimited
 392          */
 393         public static function legalChars() {
 394                 global $wgLegalTitleChars;
 395                 return $wgLegalTitleChars;
 396         }
 397
 398         /**
 399          * Get a string representation of a title suitable for
 400          * including in a search index
 401          *
 402          * @param $ns \type{\int} a namespace index
 403          * @param $title \type{\string} text-form main part
 404          * @return \type{\string} a stripped-down title string ready for the
 405          *      search index
 406          */
 407         public static function indexTitle( $ns, $title ) {
 408                 global $wgContLang;
 409
 410                 $lc = SearchEngine::legalSearchChars() . '&#;';
 411                 $t = $wgContLang->stripForSearch( $title );
 412                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 413                 $t = $wgContLang->lc( $t );
 414
 415                 # Handle 's, s'
 416                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 417                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 418
 419                 $t = preg_replace( "/\\s+/", ' ', $t );
 420
 421                 if ( $ns == NS_FILE ) {
 422                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 423                 }
 424                 return trim( $t );
 425         }
 426
 427         /*
 428          * Make a prefixed DB key from a DB key and a namespace index
 429          * @param $ns \type{\int} numerical representation of the namespace
 430          * @param $title \type{\string} the DB key form the title
 431          * @param $fragment \type{\string} The link fragment (after the "#")
 432          * @return \type{\string} the prefixed form of the title
 433          */
 434         public static function makeName( $ns, $title, $fragment = '' ) {
 435                 global $wgContLang;
 436
 437                 $namespace = $wgContLang->getNsText( $ns );
 438                 $name = $namespace == '' ? $title : "$namespace:$title";
 439                 if ( strval( $fragment ) != '' ) {
 440                         $name .= '#' . $fragment;
 441                 }
 442                 return $name;
 443         }
 444
 445         /**
 446          * Returns the URL associated with an interwiki prefix
 447          * @param $key \type{\string} the interwiki prefix (e.g. "MeatBall")
 448          * @return \type{\string} the associated URL, containing "$1",
 449          *      which should be replaced by an article title
 450          * @static (arguably)
 451          * @deprecated See Interwiki class
 452          */
 453         public function getInterwikiLink( $key )  {
 454                 return Interwiki::fetch( $key )->getURL( );
 455         }
 456
 457         /**
 458          * Determine whether the object refers to a page within
 459          * this project.
 460          *
 461          * @return \type{\bool} TRUE if this is an in-project interwiki link
 462          *      or a wikilink, FALSE otherwise
 463          */
 464         public function isLocal() {
 465                 if ( $this->mInterwiki != '' ) {
 466                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 467                 } else {
 468                         return true;
 469                 }
 470         }
 471
 472         /**
 473          * Determine whether the object refers to a page within
 474          * this project and is transcludable.
 475          *
 476          * @return \type{\bool} TRUE if this is transcludable
 477          */
 478         public function isTrans() {
 479                 if ($this->mInterwiki == '')
 480                         return false;
 481
 482                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 483         }
 484
 485         /**
 486          * Escape a text fragment, say from a link, for a URL
 487          */
 488         static function escapeFragmentForURL( $fragment ) {
 489                 global $wgEnforceHtmlIds;
 490                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 491                 # fragments appear not to work in IE (at least up to 7) or in at least
 492                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 493                 # to care if they aren't encoded.
 494                 return Sanitizer::escapeId( $fragment,
 495                         $wgEnforceHtmlIds ? 'noninitial' : 'xml' );
 496         }
 497
 498 #----------------------------------------------------------------------------
 499 #       Other stuff
 500 #----------------------------------------------------------------------------
 501
 502         /** Simple accessors */
 503         /**
 504          * Get the text form (spaces not underscores) of the main part
 505          * @return \type{\string} Main part of the title
 506          */
 507         public function getText() { return $this->mTextform; }
 508         /**
 509          * Get the URL-encoded form of the main part
 510          * @return \type{\string} Main part of the title, URL-encoded
 511          */
 512         public function getPartialURL() { return $this->mUrlform; }
 513         /**
 514          * Get the main part with underscores
 515          * @return \type{\string} Main part of the title, with underscores
 516          */
 517         public function getDBkey() { return $this->mDbkeyform; }
 518         /**
 519          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 520          * @return \type{\int} Namespace index
 521          */
 522         public function getNamespace() { return $this->mNamespace; }
 523         /**
 524          * Get the namespace text
 525          * @return \type{\string} Namespace text
 526          */
 527         public function getNsText() {
 528                 global $wgContLang, $wgCanonicalNamespaceNames;
 529
 530                 if ( '' != $this->mInterwiki ) {
 531                         // This probably shouldn't even happen. ohh man, oh yuck.
 532                         // But for interwiki transclusion it sometimes does.
 533                         // Shit. Shit shit shit.
 534                         //
 535                         // Use the canonical namespaces if possible to try to
 536                         // resolve a foreign namespace.
 537                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 538                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 539                         }
 540                 }
 541                 return $wgContLang->getNsText( $this->mNamespace );
 542         }
 543         /**
 544          * Get the DB key with the initial letter case as specified by the user
 545          * @return \type{\string} DB key
 546          */
 547         function getUserCaseDBKey() {
 548                 return $this->mUserCaseDBKey;
 549         }
 550         /**
 551          * Get the namespace text of the subject (rather than talk) page
 552          * @return \type{\string} Namespace text
 553          */
 554         public function getSubjectNsText() {
 555                 global $wgContLang;
 556                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 557         }
 558         /**
 559          * Get the namespace text of the talk page
 560          * @return \type{\string} Namespace text
 561          */
 562         public function getTalkNsText() {
 563                 global $wgContLang;
 564                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 565         }
 566         /**
 567          * Could this title have a corresponding talk page?
 568          * @return \type{\bool} TRUE or FALSE
 569          */
 570         public function canTalk() {
 571                 return( MWNamespace::canTalk( $this->mNamespace ) );
 572         }
 573         /**
 574          * Get the interwiki prefix (or null string)
 575          * @return \type{\string} Interwiki prefix
 576          */
 577         public function getInterwiki() { return $this->mInterwiki; }
 578         /**
 579          * Get the Title fragment (i.e.\ the bit after the #) in text form
 580          * @return \type{\string} Title fragment
 581          */
 582         public function getFragment() { return $this->mFragment; }
 583         /**
 584          * Get the fragment in URL form, including the "#" character if there is one
 585          * @return \type{\string} Fragment in URL form
 586          */
 587         public function getFragmentForURL() {
 588                 if ( $this->mFragment == '' ) {
 589                         return '';
 590                 } else {
 591                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 592                 }
 593         }
 594         /**
 595          * Get the default namespace index, for when there is no namespace
 596          * @return \type{\int} Default namespace index
 597          */
 598         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 599
 600         /**
 601          * Get title for search index
 602          * @return \type{\string} a stripped-down title string ready for the
 603          *      search index
 604          */
 605         public function getIndexTitle() {
 606                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 607         }
 608
 609         /**
 610          * Get the prefixed database key form
 611          * @return \type{\string} the prefixed title, with underscores and
 612          *      any interwiki and namespace prefixes
 613          */
 614         public function getPrefixedDBkey() {
 615                 $s = $this->prefix( $this->mDbkeyform );
 616                 $s = str_replace( ' ', '_', $s );
 617                 return $s;
 618         }
 619
 620         /**
 621          * Get the prefixed title with spaces.
 622          * This is the form usually used for display
 623          * @return \type{\string} the prefixed title, with spaces
 624          */
 625         public function getPrefixedText() {
 626                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 627                         $s = $this->prefix( $this->mTextform );
 628                         $s = str_replace( '_', ' ', $s );
 629                         $this->mPrefixedText = $s;
 630                 }
 631                 return $this->mPrefixedText;
 632         }
 633
 634         /**
 635          * Get the prefixed title with spaces, plus any fragment
 636          * (part beginning with '#')
 637          * @return \type{\string} the prefixed title, with spaces and
 638          *      the fragment, including '#'
 639          */
 640         public function getFullText() {
 641                 $text = $this->getPrefixedText();
 642                 if( '' != $this->mFragment ) {
 643                         $text .= '#' . $this->mFragment;
 644                 }
 645                 return $text;
 646         }
 647
 648         /**
 649          * Get the base name, i.e. the leftmost parts before the /
 650          * @return \type{\string} Base name
 651          */
 652         public function getBaseText() {
 653                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 654                         return $this->getText();
 655                 }
 656
 657                 $parts = explode( '/', $this->getText() );
 658                 # Don't discard the real title if there's no subpage involved
 659                 if( count( $parts ) > 1 )
 660                         unset( $parts[ count( $parts ) - 1 ] );
 661                 return implode( '/', $parts );
 662         }
 663
 664         /**
 665          * Get the lowest-level subpage name, i.e. the rightmost part after /
 666          * @return \type{\string} Subpage name
 667          */
 668         public function getSubpageText() {
 669                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 670                         return( $this->mTextform );
 671                 }
 672                 $parts = explode( '/', $this->mTextform );
 673                 return( $parts[ count( $parts ) - 1 ] );
 674         }
 675
 676         /**
 677          * Get a URL-encoded form of the subpage text
 678          * @return \type{\string} URL-encoded subpage name
 679          */
 680         public function getSubpageUrlForm() {
 681                 $text = $this->getSubpageText();
 682                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 683                 return( $text );
 684         }
 685
 686         /**
 687          * Get a URL-encoded title (not an actual URL) including interwiki
 688          * @return \type{\string} the URL-encoded form
 689          */
 690         public function getPrefixedURL() {
 691                 $s = $this->prefix( $this->mDbkeyform );
 692                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 693                 return $s;
 694         }
 695
 696         /**
 697          * Get a real URL referring to this title, with interwiki link and
 698          * fragment
 699          *
 700          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 701          *   links. Can be specified as an associative array as well, e.g.,
 702          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 703          * @param $variant \type{\string} language variant of url (for sr, zh..)
 704          * @return \type{\string} the URL
 705          */
 706         public function getFullURL( $query = '', $variant = false ) {
 707                 global $wgContLang, $wgServer, $wgRequest;
 708
 709                 if( is_array( $query ) ) {
 710                         $query = wfArrayToCGI( $query );
 711                 }
 712
 713                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 714                 if ( !$interwiki ) {
 715                         $url = $this->getLocalUrl( $query, $variant );
 716
 717                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 718                         // Correct fix would be to move the prepending elsewhere.
 719                         if ($wgRequest->getVal('action') != 'render') {
 720                                 $url = $wgServer . $url;
 721                         }
 722                 } else {
 723                         $baseUrl = $interwiki->getURL( );
 724
 725                         $namespace = wfUrlencode( $this->getNsText() );
 726                         if ( '' != $namespace ) {
 727                                 # Can this actually happen? Interwikis shouldn't be parsed.
 728                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 729                                 $namespace .= ':';
 730                         }
 731                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 732                         $url = wfAppendQuery( $url, $query );
 733                 }
 734
 735                 # Finally, add the fragment.
 736                 $url .= $this->getFragmentForURL();
 737
 738                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 739                 return $url;
 740         }
 741
 742         /**
 743          * Get a URL with no fragment or server name.  If this page is generated
 744          * with action=render, $wgServer is prepended.
 745          * @param mixed $query an optional query string; if not specified,
 746          *       $wgArticlePath will be used.  Can be specified as an associative array
 747          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 748          *   URL-escaped).
 749          * @param $variant \type{\string} language variant of url (for sr, zh..)
 750          * @return \type{\string} the URL
 751          */
 752         public function getLocalURL( $query = '', $variant = false ) {
 753                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 754                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 755
 756                 if( is_array( $query ) ) {
 757                         $query = wfArrayToCGI( $query );
 758                 }
 759
 760                 // internal links should point to same variant as current page (only anonymous users)
 761                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 762                         $pref = $wgContLang->getPreferredVariant(false);
 763                         if($pref != $wgContLang->getCode())
 764                                 $variant = $pref;
 765                 }
 766
 767                 if ( $this->isExternal() ) {
 768                         $url = $this->getFullURL();
 769                         if ( $query ) {
 770                                 // This is currently only used for edit section links in the
 771                                 // context of interwiki transclusion. In theory we should
 772                                 // append the query to the end of any existing query string,
 773                                 // but interwiki transclusion is already broken in that case.
 774                                 $url .= "?$query";
 775                         }
 776                 } else {
 777                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 778                         if ( $query == '' ) {
 779                                 if( $variant != false && $wgContLang->hasVariants() ) {
 780                                         if( $wgVariantArticlePath == false ) {
 781                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 782                                         } else {
 783                                                 $variantArticlePath = $wgVariantArticlePath;
 784                                         }
 785                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 786                                         $url = str_replace( '$1', $dbkey, $url  );
 787                                 } else {
 788                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 789                                 }
 790                         } else {
 791                                 global $wgActionPaths;
 792                                 $url = false;
 793                                 $matches = array();
 794                                 if( !empty( $wgActionPaths ) &&
 795                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 796                                 {
 797                                         $action = urldecode( $matches[2] );
 798                                         if( isset( $wgActionPaths[$action] ) ) {
 799                                                 $query = $matches[1];
 800                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 801                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 802                                                 if( $query != '' ) {
 803                                                         $url = wfAppendQuery( $url, $query );
 804                                                 }
 805                                         }
 806                                 }
 807                                 if ( $url === false ) {
 808                                         if ( $query == '-' ) {
 809                                                 $query = '';
 810                                         }
 811                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 812                                 }
 813                         }
 814
 815                         // FIXME: this causes breakage in various places when we
 816                         // actually expected a local URL and end up with dupe prefixes.
 817                         if ($wgRequest->getVal('action') == 'render') {
 818                                 $url = $wgServer . $url;
 819                         }
 820                 }
 821                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 822                 return $url;
 823         }
 824
 825         /**
 826          * Get a URL that's the simplest URL that will be valid to link, locally,
 827          * to the current Title.  It includes the fragment, but does not include
 828          * the server unless action=render is used (or the link is external).  If
 829          * there's a fragment but the prefixed text is empty, we just return a link
 830          * to the fragment.
 831          *
 832          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 833          *   query string.  Keys and values will be escaped.
 834          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 835          *   for external links.  Default is "false" (same variant as current page,
 836          *   for anonymous users).
 837          * @return \type{\string} the URL
 838          */
 839         public function getLinkUrl( $query = array(), $variant = false ) {
 840                 if( !is_array( $query ) ) {
 841                         throw new MWException( 'Title::getLinkUrl passed a non-array for '.
 842                         '$query' );
 843                 }
 844                 if( $this->isExternal() ) {
 845                         return $this->getFullURL( $query );
 846                 } elseif( $this->getPrefixedText() === ''
 847                 and $this->getFragment() !== '' ) {
 848                         return $this->getFragmentForURL();
 849                 } else {
 850                         return $this->getLocalURL( $query, $variant )
 851                                 . $this->getFragmentForURL();
 852                 }
 853         }
 854
 855         /**
 856          * Get an HTML-escaped version of the URL form, suitable for
 857          * using in a link, without a server name or fragment
 858          * @param $query \type{\string} an optional query string
 859          * @return \type{\string} the URL
 860          */
 861         public function escapeLocalURL( $query = '' ) {
 862                 return htmlspecialchars( $this->getLocalURL( $query ) );
 863         }
 864
 865         /**
 866          * Get an HTML-escaped version of the URL form, suitable for
 867          * using in a link, including the server name and fragment
 868          *
 869          * @param $query \type{\string} an optional query string
 870          * @return \type{\string} the URL
 871          */
 872         public function escapeFullURL( $query = '' ) {
 873                 return htmlspecialchars( $this->getFullURL( $query ) );
 874         }
 875
 876         /**
 877          * Get the URL form for an internal link.
 878          * - Used in various Squid-related code, in case we have a different
 879          * internal hostname for the server from the exposed one.
 880          *
 881          * @param $query \type{\string} an optional query string
 882          * @param $variant \type{\string} language variant of url (for sr, zh..)
 883          * @return \type{\string} the URL
 884          */
 885         public function getInternalURL( $query = '', $variant = false ) {
 886                 global $wgInternalServer;
 887                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 888                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 889                 return $url;
 890         }
 891
 892         /**
 893          * Get the edit URL for this Title
 894          * @return \type{\string} the URL, or a null string if this is an
 895          *      interwiki link
 896          */
 897         public function getEditURL() {
 898                 if ( '' != $this->mInterwiki ) { return ''; }
 899                 $s = $this->getLocalURL( 'action=edit' );
 900
 901                 return $s;
 902         }
 903
 904         /**
 905          * Get the HTML-escaped displayable text form.
 906          * Used for the title field in <a> tags.
 907          * @return \type{\string} the text, including any prefixes
 908          */
 909         public function getEscapedText() {
 910                 return htmlspecialchars( $this->getPrefixedText() );
 911         }
 912
 913         /**
 914          * Is this Title interwiki?
 915          * @return \type{\bool}
 916          */
 917         public function isExternal() { return ( '' != $this->mInterwiki ); }
 918
 919         /**
 920          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 921          *
 922          * @param @action \type{\string} Action to check (default: edit)
 923          * @return \type{\bool}
 924          */
 925         public function isSemiProtected( $action = 'edit' ) {
 926                 if( $this->exists() ) {
 927                         $restrictions = $this->getRestrictions( $action );
 928                         if( count( $restrictions ) > 0 ) {
 929                                 foreach( $restrictions as $restriction ) {
 930                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 931                                                 return false;
 932                                 }
 933                         } else {
 934                                 # Not protected
 935                                 return false;
 936                         }
 937                         return true;
 938                 } else {
 939                         # If it doesn't exist, it can't be protected
 940                         return false;
 941                 }
 942         }
 943
 944         /**
 945          * Does the title correspond to a protected article?
 946          * @param $what \type{\string} the action the page is protected from,
 947          * by default checks move and edit
 948          * @return \type{\bool}
 949          */
 950         public function isProtected( $action = '' ) {
 951                 global $wgRestrictionLevels, $wgRestrictionTypes;
 952
 953                 # Special pages have inherent protection
 954                 if( $this->getNamespace() == NS_SPECIAL )
 955                         return true;
 956
 957                 # Check regular protection levels
 958                 foreach( $wgRestrictionTypes as $type ){
 959                         if( $action == $type || $action == '' ) {
 960                                 $r = $this->getRestrictions( $type );
 961                                 foreach( $wgRestrictionLevels as $level ) {
 962                                         if( in_array( $level, $r ) && $level != '' ) {
 963                                                 return true;
 964                                         }
 965                                 }
 966                         }
 967                 }
 968
 969                 return false;
 970         }
 971
 972         /**
 973          * Is $wgUser watching this page?
 974          * @return \type{\bool}
 975          */
 976         public function userIsWatching() {
 977                 global $wgUser;
 978
 979                 if ( is_null( $this->mWatched ) ) {
 980                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 981                                 $this->mWatched = false;
 982                         } else {
 983                                 $this->mWatched = $wgUser->isWatched( $this );
 984                         }
 985                 }
 986                 return $this->mWatched;
 987         }
 988
 989         /**
 990          * Can $wgUser perform $action on this page?
 991          * This skips potentially expensive cascading permission checks.
 992          *
 993          * Suitable for use for nonessential UI controls in common cases, but
 994          * _not_ for functional access control.
 995          *
 996          * May provide false positives, but should never provide a false negative.
 997          *
 998          * @param $action \type{\string} action that permission needs to be checked for
 999          * @return \type{\bool}
1000          */
1001         public function quickUserCan( $action ) {
1002                 return $this->userCan( $action, false );
1003         }
1004
1005         /**
1006          * Determines if $wgUser is unable to edit this page because it has been protected
1007          * by $wgNamespaceProtection.
1008          *
1009          * @return \type{\bool}
1010          */
1011         public function isNamespaceProtected() {
1012                 global $wgNamespaceProtection, $wgUser;
1013                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1014                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1015                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1016                                         return true;
1017                         }
1018                 }
1019                 return false;
1020         }
1021
1022         /**
1023          * Can $wgUser perform $action on this page?
1024          * @param $action \type{\string} action that permission needs to be checked for
1025          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1026          * @return \type{\bool}
1027          */
1028         public function userCan( $action, $doExpensiveQueries = true ) {
1029                 global $wgUser;
1030                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1031         }
1032
1033         /**
1034          * Can $user perform $action on this page?
1035          *
1036          * FIXME: This *does not* check throttles (User::pingLimiter()).
1037          *
1038          * @param $action \type{\string}action that permission needs to be checked for
1039          * @param $user \type{User} user to check
1040          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1041          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1042          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1043          */
1044         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1045                 if( !StubObject::isRealObject( $user ) ) {
1046                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1047                         global $wgUser;
1048                         $wgUser->_unstub( '', 5 );
1049                         $user = $wgUser;
1050                 }
1051                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1052
1053                 global $wgContLang;
1054                 global $wgLang;
1055                 global $wgEmailConfirmToEdit;
1056
1057                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1058                         $errors[] = array( 'confirmedittext' );
1059                 }
1060
1061                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1062                 if ( $user->isBlockedFrom( $this ) && $action != 'read' && $action != 'createaccount' ) {
1063                         $block = $user->mBlock;
1064
1065                         // This is from OutputPage::blockedPage
1066                         // Copied at r23888 by werdna
1067
1068                         $id = $user->blockedBy();
1069                         $reason = $user->blockedFor();
1070                         if( $reason == '' ) {
1071                                 $reason = wfMsg( 'blockednoreason' );
1072                         }
1073                         $ip = wfGetIP();
1074
1075                         if ( is_numeric( $id ) ) {
1076                                 $name = User::whoIs( $id );
1077                         } else {
1078                                 $name = $id;
1079                         }
1080
1081                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1082                         $blockid = $block->mId;
1083                         $blockExpiry = $user->mBlock->mExpiry;
1084                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1085
1086                         if ( $blockExpiry == 'infinity' ) {
1087                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1088                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1089
1090                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1091                                         if ( strpos( $option, ':' ) == false )
1092                                                 continue;
1093
1094                                         list ($show, $value) = explode( ":", $option );
1095
1096                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1097                                                 $blockExpiry = $show;
1098                                                 break;
1099                                         }
1100                                 }
1101                         } else {
1102                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1103                         }
1104
1105                         $intended = $user->mBlock->mAddress;
1106
1107                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1108                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1109                 }
1110
1111                 // Remove the errors being ignored.
1112
1113                 foreach( $errors as $index => $error ) {
1114                         $error_key = is_array($error) ? $error[0] : $error;
1115
1116                         if (in_array( $error_key, $ignoreErrors )) {
1117                                 unset($errors[$index]);
1118                         }
1119                 }
1120
1121                 return $errors;
1122         }
1123
1124         /**
1125          * Can $user perform $action on this page? This is an internal function,
1126          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1127          * checks on wfReadOnly() and blocks)
1128          *
1129          * @param $action \type{\string} action that permission needs to be checked for
1130          * @param $user \type{User} user to check
1131          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1132          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1133          */
1134         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1135                 wfProfileIn( __METHOD__ );
1136
1137                 $errors = array();
1138
1139                 // Use getUserPermissionsErrors instead
1140                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1141                         wfProfileOut( __METHOD__ );
1142                         return $result ? array() : array( array( 'badaccess-group0' ) );
1143                 }
1144
1145                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1146                         if( is_array($result) && count($result) && !is_array($result[0]) )
1147                                 $errors[] = $result; # A single array representing an error
1148                         else if( is_array($result) && is_array($result[0]) )
1149                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1150                         else if( $result !== '' && is_string($result) )
1151                                 $errors[] = array($result); # A string representing a message-id
1152                         else if( $result === false )
1153                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1154                 }
1155                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1156                         if( is_array($result) && count($result) && !is_array($result[0]) )
1157                                 $errors[] = $result; # A single array representing an error
1158                         else if( is_array($result) && is_array($result[0]) )
1159                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1160                         else if( $result !== '' && is_string($result) )
1161                                 $errors[] = array($result); # A string representing a message-id
1162                         else if( $result === false )
1163                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1164                 }
1165
1166                 // TODO: document
1167                 $specialOKActions = array( 'createaccount', 'execute' );
1168                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1169                         $errors[] = array('ns-specialprotected');
1170                 }
1171
1172                 if( $this->isNamespaceProtected() ) {
1173                         $ns = $this->getNamespace() == NS_MAIN ?
1174                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1175                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1176                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1177                 }
1178
1179                 # protect css/js subpages of user pages
1180                 # XXX: this might be better using restrictions
1181                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1182                 if( $this->isCssJsSubpage() && !$user->isAllowed('editusercssjs')
1183                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1184                 {
1185                         $errors[] = array('customcssjsprotected');
1186                 }
1187
1188                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1189                         # We /could/ use the protection level on the source page, but it's fairly ugly
1190                         #  as we have to establish a precedence hierarchy for pages included by multiple
1191                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1192                         #  as they could remove the protection anyway.
1193                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1194                         # Cascading protection depends on more than this page...
1195                         # Several cascading protected pages may include this page...
1196                         # Check each cascading level
1197                         # This is only for protection restrictions, not for all actions
1198                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1199                                 foreach( $restrictions[$action] as $right ) {
1200                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1201                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1202                                                 $pages = '';
1203                                                 foreach( $cascadingSources as $page )
1204                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1205                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1206                                         }
1207                                 }
1208                         }
1209                 }
1210
1211                 foreach( $this->getRestrictions($action) as $right ) {
1212                         // Backwards compatibility, rewrite sysop -> protect
1213                         if( $right == 'sysop' ) {
1214                                 $right = 'protect';
1215                         }
1216                         if( '' != $right && !$user->isAllowed( $right ) ) {
1217                                 // Users with 'editprotected' permission can edit protected pages
1218                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1219                                         // Users with 'editprotected' permission cannot edit protected pages
1220                                         // with cascading option turned on.
1221                                         if( $this->mCascadeRestriction ) {
1222                                                 $errors[] = array( 'protectedpagetext', $right );
1223                                         } else {
1224                                                 // Nothing, user can edit!
1225                                         }
1226                                 } else {
1227                                         $errors[] = array( 'protectedpagetext', $right );
1228                                 }
1229                         }
1230                 }
1231
1232                 if( $action == 'protect' ) {
1233                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1234                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1235                         }
1236                 }
1237
1238                 if( $action == 'create' ) {
1239                         $title_protection = $this->getTitleProtection();
1240                         if( is_array($title_protection) ) {
1241                                 extract($title_protection); // is this extract() really needed?
1242
1243                                 if( $pt_create_perm == 'sysop' ) {
1244                                         $pt_create_perm = 'protect'; // B/C
1245                                 }
1246                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1247                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1248                                 }
1249                         }
1250
1251                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1252                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1253                         {
1254                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1255                         }
1256                 } elseif( $action == 'move' ) {
1257                         if( !$user->isAllowed( 'move' ) ) {
1258                                 // User can't move anything
1259                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1260                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1261                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1262                         {
1263                                 // Show user page-specific message only if the user can move other pages
1264                                 $errors[] = array( 'cant-move-user-page' );
1265                         }
1266                         // Check if user is allowed to move files if it's a file
1267                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1268                                 $errors[] = array( 'movenotallowedfile' );
1269                         }
1270                         // Check for immobile pages
1271                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1272                                 // Specific message for this case
1273                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1274                         } elseif( !$this->isMovable() ) {
1275                                 // Less specific message for rarer cases
1276                                 $errors[] = array( 'immobile-page' );
1277                         }
1278                 } elseif( $action == 'move-target' ) {
1279                         if( !$user->isAllowed( 'move' ) ) {
1280                                 // User can't move anything
1281                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1282                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1283                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1284                         {
1285                                 // Show user page-specific message only if the user can move other pages
1286                                 $errors[] = array( 'cant-move-to-user-page' );
1287                         }
1288                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1289                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1290                         } elseif( !$this->isMovable() ) {
1291                                 $errors[] = array( 'immobile-target-page' );
1292                         }
1293                 } elseif( !$user->isAllowed( $action ) ) {
1294                         $return = null;
1295                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1296                                 User::getGroupsWithPermission( $action ) );
1297                         if( $groups ) {
1298                                 $return = array( 'badaccess-groups',
1299                                         array( implode( ', ', $groups ), count( $groups ) ) );
1300                         } else {
1301                                 $return = array( "badaccess-group0" );
1302                         }
1303                         $errors[] = $return;
1304                 }
1305
1306                 wfProfileOut( __METHOD__ );
1307                 return $errors;
1308         }
1309
1310         /**
1311          * Is this title subject to title protection?
1312          * @return \type{\mixed} An associative array representing any existent title
1313          *   protection, or false if there's none.
1314          */
1315         private function getTitleProtection() {
1316                 // Can't protect pages in special namespaces
1317                 if ( $this->getNamespace() < 0 ) {
1318                         return false;
1319                 }
1320
1321                 $dbr = wfGetDB( DB_SLAVE );
1322                 $res = $dbr->select( 'protected_titles', '*',
1323                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1324                         __METHOD__ );
1325
1326                 if ($row = $dbr->fetchRow( $res )) {
1327                         return $row;
1328                 } else {
1329                         return false;
1330                 }
1331         }
1332
1333         /**
1334          * Update the title protection status
1335          * @param $create_perm \type{\string} Permission required for creation
1336          * @param $reason \type{\string} Reason for protection
1337          * @param $expiry \type{\string} Expiry timestamp
1338          */
1339         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1340                 global $wgUser,$wgContLang;
1341
1342                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1343                         && $expiry == $this->mRestrictionsExpiry['create']) {
1344                         // No change
1345                         return true;
1346                 }
1347
1348                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1349
1350                 $dbw = wfGetDB( DB_MASTER );
1351
1352                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1353
1354                 $expiry_description = '';
1355                 if ( $encodedExpiry != 'infinity' ) {
1356                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) , $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1357                 }
1358                 else {
1359                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1360                 }
1361
1362                 # Update protection table
1363                 if ($create_perm != '' ) {
1364                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1365                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1366                                         , 'pt_create_perm' => $create_perm
1367                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1368                                         , 'pt_expiry' => $encodedExpiry
1369                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1370                 } else {
1371                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1372                                 'pt_title' => $title ), __METHOD__ );
1373                 }
1374                 # Update the protection log
1375                 $log = new LogPage( 'protect' );
1376
1377                 if( $create_perm ) {
1378                         $params = array("[create=$create_perm] $expiry_description",'');
1379                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason ), $params );
1380                 } else {
1381                         $log->addEntry( 'unprotect', $this, $reason );
1382                 }
1383
1384                 return true;
1385         }
1386
1387         /**
1388          * Remove any title protection due to page existing
1389          */
1390         public function deleteTitleProtection() {
1391                 $dbw = wfGetDB( DB_MASTER );
1392
1393                 $dbw->delete( 'protected_titles',
1394                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1395                         __METHOD__ );
1396         }
1397
1398         /**
1399          * Can $wgUser edit this page?
1400          * @return \type{\bool} TRUE or FALSE
1401          * @deprecated use userCan('edit')
1402          */
1403         public function userCanEdit( $doExpensiveQueries = true ) {
1404                 return $this->userCan( 'edit', $doExpensiveQueries );
1405         }
1406
1407         /**
1408          * Can $wgUser create this page?
1409          * @return \type{\bool} TRUE or FALSE
1410          * @deprecated use userCan('create')
1411          */
1412         public function userCanCreate( $doExpensiveQueries = true ) {
1413                 return $this->userCan( 'create', $doExpensiveQueries );
1414         }
1415
1416         /**
1417          * Can $wgUser move this page?
1418          * @return \type{\bool} TRUE or FALSE
1419          * @deprecated use userCan('move')
1420          */
1421         public function userCanMove( $doExpensiveQueries = true ) {
1422                 return $this->userCan( 'move', $doExpensiveQueries );
1423         }
1424
1425         /**
1426          * Would anybody with sufficient privileges be able to move this page?
1427          * Some pages just aren't movable.
1428          *
1429          * @return \type{\bool} TRUE or FALSE
1430          */
1431         public function isMovable() {
1432                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1433         }
1434
1435         /**
1436          * Can $wgUser read this page?
1437          * @return \type{\bool} TRUE or FALSE
1438          * @todo fold these checks into userCan()
1439          */
1440         public function userCanRead() {
1441                 global $wgUser, $wgGroupPermissions;
1442
1443                 $result = null;
1444                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1445                 if ( $result !== null ) {
1446                         return $result;
1447                 }
1448
1449                 # Shortcut for public wikis, allows skipping quite a bit of code
1450                 if ($wgGroupPermissions['*']['read'])
1451                         return true;
1452
1453                 if( $wgUser->isAllowed( 'read' ) ) {
1454                         return true;
1455                 } else {
1456                         global $wgWhitelistRead;
1457
1458                         /**
1459                          * Always grant access to the login page.
1460                          * Even anons need to be able to log in.
1461                         */
1462                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1463                                 return true;
1464                         }
1465
1466                         /**
1467                          * Bail out if there isn't whitelist
1468                          */
1469                         if( !is_array($wgWhitelistRead) ) {
1470                                 return false;
1471                         }
1472
1473                         /**
1474                          * Check for explicit whitelisting
1475                          */
1476                         $name = $this->getPrefixedText();
1477                         $dbName = $this->getPrefixedDBKey();
1478                         // Check with and without underscores
1479                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1480                                 return true;
1481
1482                         /**
1483                          * Old settings might have the title prefixed with
1484                          * a colon for main-namespace pages
1485                          */
1486                         if( $this->getNamespace() == NS_MAIN ) {
1487                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1488                                         return true;
1489                         }
1490
1491                         /**
1492                          * If it's a special page, ditch the subpage bit
1493                          * and check again
1494                          */
1495                         if( $this->getNamespace() == NS_SPECIAL ) {
1496                                 $name = $this->getDBkey();
1497                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1498                                 if ( $name === false ) {
1499                                         # Invalid special page, but we show standard login required message
1500                                         return false;
1501                                 }
1502
1503                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1504                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1505                                         return true;
1506                         }
1507
1508                 }
1509                 return false;
1510         }
1511
1512         /**
1513          * Is this a talk page of some sort?
1514          * @return \type{\bool} TRUE or FALSE
1515          */
1516         public function isTalkPage() {
1517                 return MWNamespace::isTalk( $this->getNamespace() );
1518         }
1519
1520         /**
1521          * Is this a subpage?
1522          * @return \type{\bool} TRUE or FALSE
1523          */
1524         public function isSubpage() {
1525                 return MWNamespace::hasSubpages( $this->mNamespace )
1526                         ? strpos( $this->getText(), '/' ) !== false
1527                         : false;
1528         }
1529
1530         /**
1531          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1532          * @return \type{\bool} TRUE or FALSE
1533          */
1534         public function hasSubpages() {
1535                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1536                         # Duh
1537                         return false;
1538                 }
1539
1540                 # We dynamically add a member variable for the purpose of this method
1541                 # alone to cache the result.  There's no point in having it hanging
1542                 # around uninitialized in every Title object; therefore we only add it
1543                 # if needed and don't declare it statically.
1544                 if( isset( $this->mHasSubpages ) ) {
1545                         return $this->mHasSubpages;
1546                 }
1547
1548                 $db = wfGetDB( DB_SLAVE );
1549                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1550                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1551                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1552                         __METHOD__
1553                 );
1554         }
1555
1556         /**
1557          * Could this page contain custom CSS or JavaScript, based
1558          * on the title?
1559          *
1560          * @return \type{\bool} TRUE or FALSE
1561          */
1562         public function isCssOrJsPage() {
1563                 return $this->mNamespace == NS_MEDIAWIKI
1564                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1565         }
1566
1567         /**
1568          * Is this a .css or .js subpage of a user page?
1569          * @return \type{\bool} TRUE or FALSE
1570          */
1571         public function isCssJsSubpage() {
1572                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1573         }
1574         /**
1575          * Is this a *valid* .css or .js subpage of a user page?
1576          * Check that the corresponding skin exists
1577          * @return \type{\bool} TRUE or FALSE
1578          */
1579         public function isValidCssJsSubpage() {
1580                 if ( $this->isCssJsSubpage() ) {
1581                         $skinNames = Skin::getSkinNames();
1582                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1583                 } else {
1584                         return false;
1585                 }
1586         }
1587         /**
1588          * Trim down a .css or .js subpage title to get the corresponding skin name
1589          */
1590         public function getSkinFromCssJsSubpage() {
1591                 $subpage = explode( '/', $this->mTextform );
1592                 $subpage = $subpage[ count( $subpage ) - 1 ];
1593                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1594         }
1595         /**
1596          * Is this a .css subpage of a user page?
1597          * @return \type{\bool} TRUE or FALSE
1598          */
1599         public function isCssSubpage() {
1600                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1601         }
1602         /**
1603          * Is this a .js subpage of a user page?
1604          * @return \type{\bool} TRUE or FALSE
1605          */
1606         public function isJsSubpage() {
1607                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1608         }
1609         /**
1610          * Protect css/js subpages of user pages: can $wgUser edit
1611          * this page?
1612          *
1613          * @return \type{\bool} TRUE or FALSE
1614          * @todo XXX: this might be better using restrictions
1615          */
1616         public function userCanEditCssJsSubpage() {
1617                 global $wgUser;
1618                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1619         }
1620
1621         /**
1622          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1623          *
1624          * @return \type{\bool} If the page is subject to cascading restrictions.
1625          */
1626         public function isCascadeProtected() {
1627                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1628                 return ( $sources > 0 );
1629         }
1630
1631         /**
1632          * Cascading protection: Get the source of any cascading restrictions on this page.
1633          *
1634          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1635          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1636          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1637          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1638          */
1639         public function getCascadeProtectionSources( $get_pages = true ) {
1640                 global $wgRestrictionTypes;
1641
1642                 # Define our dimension of restrictions types
1643                 $pagerestrictions = array();
1644                 foreach( $wgRestrictionTypes as $action )
1645                         $pagerestrictions[$action] = array();
1646
1647                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1648                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1649                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1650                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1651                 }
1652
1653                 wfProfileIn( __METHOD__ );
1654
1655                 $dbr = wfGetDB( DB_SLAVE );
1656
1657                 if ( $this->getNamespace() == NS_FILE ) {
1658                         $tables = array ('imagelinks', 'page_restrictions');
1659                         $where_clauses = array(
1660                                 'il_to' => $this->getDBkey(),
1661                                 'il_from=pr_page',
1662                                 'pr_cascade' => 1 );
1663                 } else {
1664                         $tables = array ('templatelinks', 'page_restrictions');
1665                         $where_clauses = array(
1666                                 'tl_namespace' => $this->getNamespace(),
1667                                 'tl_title' => $this->getDBkey(),
1668                                 'tl_from=pr_page',
1669                                 'pr_cascade' => 1 );
1670                 }
1671
1672                 if ( $get_pages ) {
1673                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1674                         $where_clauses[] = 'page_id=pr_page';
1675                         $tables[] = 'page';
1676                 } else {
1677                         $cols = array( 'pr_expiry' );
1678                 }
1679
1680                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1681
1682                 $sources = $get_pages ? array() : false;
1683                 $now = wfTimestampNow();
1684                 $purgeExpired = false;
1685
1686                 foreach( $res as $row ) {
1687                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1688                         if( $expiry > $now ) {
1689                                 if ($get_pages) {
1690                                         $page_id = $row->pr_page;
1691                                         $page_ns = $row->page_namespace;
1692                                         $page_title = $row->page_title;
1693                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1694                                         # Add groups needed for each restriction type if its not already there
1695                                         # Make sure this restriction type still exists
1696                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1697                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1698                                         }
1699                                 } else {
1700                                         $sources = true;
1701                                 }
1702                         } else {
1703                                 // Trigger lazy purge of expired restrictions from the db
1704                                 $purgeExpired = true;
1705                         }
1706                 }
1707                 if( $purgeExpired ) {
1708                         Title::purgeExpiredRestrictions();
1709                 }
1710
1711                 wfProfileOut( __METHOD__ );
1712
1713                 if ( $get_pages ) {
1714                         $this->mCascadeSources = $sources;
1715                         $this->mCascadingRestrictions = $pagerestrictions;
1716                 } else {
1717                         $this->mHasCascadingRestrictions = $sources;
1718                 }
1719                 return array( $sources, $pagerestrictions );
1720         }
1721
1722         function areRestrictionsCascading() {
1723                 if (!$this->mRestrictionsLoaded) {
1724                         $this->loadRestrictions();
1725                 }
1726
1727                 return $this->mCascadeRestriction;
1728         }
1729
1730         /**
1731          * Loads a string into mRestrictions array
1732          * @param $res \type{Resource} restrictions as an SQL result.
1733          */
1734         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1735                 global $wgRestrictionTypes;
1736                 $dbr = wfGetDB( DB_SLAVE );
1737
1738                 foreach( $wgRestrictionTypes as $type ){
1739                         $this->mRestrictions[$type] = array();
1740                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1741                 }
1742
1743                 $this->mCascadeRestriction = false;
1744
1745                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1746
1747                 if ( $oldFashionedRestrictions === NULL ) {
1748                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1749                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1750                 }
1751
1752                 if ($oldFashionedRestrictions != '') {
1753
1754                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1755                                 $temp = explode( '=', trim( $restrict ) );
1756                                 if(count($temp) == 1) {
1757                                         // old old format should be treated as edit/move restriction
1758                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1759                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1760                                 } else {
1761                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1762                                 }
1763                         }
1764
1765                         $this->mOldRestrictions = true;
1766
1767                 }
1768
1769                 if( $dbr->numRows( $res ) ) {
1770                         # Current system - load second to make them override.
1771                         $now = wfTimestampNow();
1772                         $purgeExpired = false;
1773
1774                         foreach( $res as $row ) {
1775                                 # Cycle through all the restrictions.
1776
1777                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1778                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1779                                         continue;
1780
1781                                 // This code should be refactored, now that it's being used more generally,
1782                                 // But I don't really see any harm in leaving it in Block for now -werdna
1783                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1784
1785                                 // Only apply the restrictions if they haven't expired!
1786                                 if ( !$expiry || $expiry > $now ) {
1787                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1788                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1789
1790                                         $this->mCascadeRestriction |= $row->pr_cascade;
1791                                 } else {
1792                                         // Trigger a lazy purge of expired restrictions
1793                                         $purgeExpired = true;
1794                                 }
1795                         }
1796
1797                         if( $purgeExpired ) {
1798                                 Title::purgeExpiredRestrictions();
1799                         }
1800                 }
1801
1802                 $this->mRestrictionsLoaded = true;
1803         }
1804
1805         /**
1806          * Load restrictions from the page_restrictions table
1807          */
1808         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1809                 if( !$this->mRestrictionsLoaded ) {
1810                         if ($this->exists()) {
1811                                 $dbr = wfGetDB( DB_SLAVE );
1812
1813                                 $res = $dbr->select( 'page_restrictions', '*',
1814                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1815
1816                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1817                         } else {
1818                                 $title_protection = $this->getTitleProtection();
1819
1820                                 if (is_array($title_protection)) {
1821                                         extract($title_protection);
1822
1823                                         $now = wfTimestampNow();
1824                                         $expiry = Block::decodeExpiry($pt_expiry);
1825
1826                                         if (!$expiry || $expiry > $now) {
1827                                                 // Apply the restrictions
1828                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1829                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1830                                         } else { // Get rid of the old restrictions
1831                                                 Title::purgeExpiredRestrictions();
1832                                         }
1833                                 } else {
1834                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1835                                 }
1836                                 $this->mRestrictionsLoaded = true;
1837                         }
1838                 }
1839         }
1840
1841         /**
1842          * Purge expired restrictions from the page_restrictions table
1843          */
1844         static function purgeExpiredRestrictions() {
1845                 $dbw = wfGetDB( DB_MASTER );
1846                 $dbw->delete( 'page_restrictions',
1847                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1848                         __METHOD__ );
1849
1850                 $dbw->delete( 'protected_titles',
1851                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1852                         __METHOD__ );
1853         }
1854
1855         /**
1856          * Accessor/initialisation for mRestrictions
1857          *
1858          * @param $action \type{\string} action that permission needs to be checked for
1859          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
1860          */
1861         public function getRestrictions( $action ) {
1862                 if( !$this->mRestrictionsLoaded ) {
1863                         $this->loadRestrictions();
1864                 }
1865                 return isset( $this->mRestrictions[$action] )
1866                                 ? $this->mRestrictions[$action]
1867                                 : array();
1868         }
1869
1870         /**
1871          * Get the expiry time for the restriction against a given action
1872          * @return 14-char timestamp, or 'infinity' if the page is protected forever
1873          * or not protected at all, or false if the action is not recognised.
1874          */
1875         public function getRestrictionExpiry( $action ) {
1876                 if( !$this->mRestrictionsLoaded ) {
1877                         $this->loadRestrictions();
1878                 }
1879                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
1880         }
1881
1882         /**
1883          * Is there a version of this page in the deletion archive?
1884          * @return \type{\int} the number of archived revisions
1885          */
1886         public function isDeleted() {
1887                 $fname = 'Title::isDeleted';
1888                 if ( $this->getNamespace() < 0 ) {
1889                         $n = 0;
1890                 } else {
1891                         $dbr = wfGetDB( DB_SLAVE );
1892                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1893                                 'ar_title' => $this->getDBkey() ), $fname );
1894                         if( $this->getNamespace() == NS_FILE ) {
1895                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1896                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1897                         }
1898                 }
1899                 return (int)$n;
1900         }
1901
1902         /**
1903          * Get the article ID for this Title from the link cache,
1904          * adding it if necessary
1905          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
1906          *      for update
1907          * @return \type{\int} the ID
1908          */
1909         public function getArticleID( $flags = 0 ) {
1910                 if( $this->getNamespace() < 0 ) {
1911                         return $this->mArticleID = 0;
1912                 }
1913                 $linkCache = LinkCache::singleton();
1914                 if( $flags & GAID_FOR_UPDATE ) {
1915                         $oldUpdate = $linkCache->forUpdate( true );
1916                         $linkCache->clearLink( $this );
1917                         $this->mArticleID = $linkCache->addLinkObj( $this );
1918                         $linkCache->forUpdate( $oldUpdate );
1919                 } else {
1920                         if( -1 == $this->mArticleID ) {
1921                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1922                         }
1923                 }
1924                 return $this->mArticleID;
1925         }
1926
1927         /**
1928          * Is this an article that is a redirect page?
1929          * Uses link cache, adding it if necessary
1930          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1931          * @return \type{\bool}
1932          */
1933         public function isRedirect( $flags = 0 ) {
1934                 if( !is_null($this->mRedirect) )
1935                         return $this->mRedirect;
1936                 # Calling getArticleID() loads the field from cache as needed
1937                 if( !$this->getArticleID($flags) ) {
1938                         return $this->mRedirect = false;
1939                 }
1940                 $linkCache = LinkCache::singleton();
1941                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1942
1943                 return $this->mRedirect;
1944         }
1945
1946         /**
1947          * What is the length of this page?
1948          * Uses link cache, adding it if necessary
1949          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1950          * @return \type{\bool}
1951          */
1952         public function getLength( $flags = 0 ) {
1953                 if( $this->mLength != -1 )
1954                         return $this->mLength;
1955                 # Calling getArticleID() loads the field from cache as needed
1956                 if( !$this->getArticleID($flags) ) {
1957                         return $this->mLength = 0;
1958                 }
1959                 $linkCache = LinkCache::singleton();
1960                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1961
1962                 return $this->mLength;
1963         }
1964
1965         /**
1966          * What is the page_latest field for this page?
1967          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1968          * @return \type{\int}
1969          */
1970         public function getLatestRevID( $flags = 0 ) {
1971                 if( $this->mLatestID !== false )
1972                         return $this->mLatestID;
1973
1974                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1975                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
1976                 return $this->mLatestID;
1977         }
1978
1979         /**
1980          * This clears some fields in this object, and clears any associated
1981          * keys in the "bad links" section of the link cache.
1982          *
1983          * - This is called from Article::insertNewArticle() to allow
1984          * loading of the new page_id. It's also called from
1985          * Article::doDeleteArticle()
1986          *
1987          * @param $newid \type{\int} the new Article ID
1988          */
1989         public function resetArticleID( $newid ) {
1990                 $linkCache = LinkCache::singleton();
1991                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1992
1993                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1994                 else { $this->mArticleID = $newid; }
1995                 $this->mRestrictionsLoaded = false;
1996                 $this->mRestrictions = array();
1997         }
1998
1999         /**
2000          * Updates page_touched for this page; called from LinksUpdate.php
2001          * @return \type{\bool} true if the update succeded
2002          */
2003         public function invalidateCache() {
2004                 if( wfReadOnly() ) {
2005                         return;
2006                 }
2007                 $dbw = wfGetDB( DB_MASTER );
2008                 $success = $dbw->update( 'page',
2009                         array( 'page_touched' => $dbw->timestamp() ),
2010                         $this->pageCond(),
2011                         __METHOD__
2012                 );
2013                 HTMLFileCache::clearFileCache( $this );
2014                 return $success;
2015         }
2016
2017         /**
2018          * Prefix some arbitrary text with the namespace or interwiki prefix
2019          * of this object
2020          *
2021          * @param $name \type{\string} the text
2022          * @return \type{\string} the prefixed text
2023          * @private
2024          */
2025         /* private */ function prefix( $name ) {
2026                 $p = '';
2027                 if ( '' != $this->mInterwiki ) {
2028                         $p = $this->mInterwiki . ':';
2029                 }
2030                 if ( 0 != $this->mNamespace ) {
2031                         $p .= $this->getNsText() . ':';
2032                 }
2033                 return $p . $name;
2034         }
2035
2036         /**
2037          * Secure and split - main initialisation function for this object
2038          *
2039          * Assumes that mDbkeyform has been set, and is urldecoded
2040          * and uses underscores, but not otherwise munged.  This function
2041          * removes illegal characters, splits off the interwiki and
2042          * namespace prefixes, sets the other forms, and canonicalizes
2043          * everything.
2044          * @return \type{\bool} true on success
2045          */
2046         private function secureAndSplit() {
2047                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2048
2049                 # Initialisation
2050                 static $rxTc = false;
2051                 if( !$rxTc ) {
2052                         # Matching titles will be held as illegal.
2053                         $rxTc = '/' .
2054                                 # Any character not allowed is forbidden...
2055                                 '[^' . Title::legalChars() . ']' .
2056                                 # URL percent encoding sequences interfere with the ability
2057                                 # to round-trip titles -- you can't link to them consistently.
2058                                 '|%[0-9A-Fa-f]{2}' .
2059                                 # XML/HTML character references produce similar issues.
2060                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2061                                 '|&#[0-9]+;' .
2062                                 '|&#x[0-9A-Fa-f]+;' .
2063                                 '/S';
2064                 }
2065
2066                 $this->mInterwiki = $this->mFragment = '';
2067                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2068
2069                 $dbkey = $this->mDbkeyform;
2070
2071                 # Strip Unicode bidi override characters.
2072                 # Sometimes they slip into cut-n-pasted page titles, where the
2073                 # override chars get included in list displays.
2074                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2075
2076                 # Clean up whitespace
2077                 #
2078                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2079                 $dbkey = trim( $dbkey, '_' );
2080
2081                 if ( '' == $dbkey ) {
2082                         return false;
2083                 }
2084
2085                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2086                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2087                         return false;
2088                 }
2089
2090                 $this->mDbkeyform = $dbkey;
2091
2092                 # Initial colon indicates main namespace rather than specified default
2093                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2094                 if ( ':' == $dbkey{0} ) {
2095                         $this->mNamespace = NS_MAIN;
2096                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2097                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2098                 }
2099
2100                 # Namespace or interwiki prefix
2101                 $firstPass = true;
2102                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2103                 do {
2104                         $m = array();
2105                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2106                                 $p = $m[1];
2107                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2108                                         # Ordinary namespace
2109                                         $dbkey = $m[2];
2110                                         $this->mNamespace = $ns;
2111                                         # For Talk:X pages, check if X has a "namespace" prefix
2112                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2113                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2114                                                         return false; # Disallow Talk:File:x type titles...
2115                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2116                                                         return false; # Disallow Talk:Interwiki:x type titles...
2117                                         }
2118                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2119                                         if( !$firstPass ) {
2120                                                 # Can't make a local interwiki link to an interwiki link.
2121                                                 # That's just crazy!
2122                                                 return false;
2123                                         }
2124
2125                                         # Interwiki link
2126                                         $dbkey = $m[2];
2127                                         $this->mInterwiki = $wgContLang->lc( $p );
2128
2129                                         # Redundant interwiki prefix to the local wiki
2130                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2131                                                 if( $dbkey == '' ) {
2132                                                         # Can't have an empty self-link
2133                                                         return false;
2134                                                 }
2135                                                 $this->mInterwiki = '';
2136                                                 $firstPass = false;
2137                                                 # Do another namespace split...
2138                                                 continue;
2139                                         }
2140
2141                                         # If there's an initial colon after the interwiki, that also
2142                                         # resets the default namespace
2143                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2144                                                 $this->mNamespace = NS_MAIN;
2145                                                 $dbkey = substr( $dbkey, 1 );
2146                                         }
2147                                 }
2148                                 # If there's no recognized interwiki or namespace,
2149                                 # then let the colon expression be part of the title.
2150                         }
2151                         break;
2152                 } while( true );
2153
2154                 # We already know that some pages won't be in the database!
2155                 #
2156                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2157                         $this->mArticleID = 0;
2158                 }
2159                 $fragment = strstr( $dbkey, '#' );
2160                 if ( false !== $fragment ) {
2161                         $this->setFragment( $fragment );
2162                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2163                         # remove whitespace again: prevents "Foo_bar_#"
2164                         # becoming "Foo_bar_"
2165                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2166                 }
2167
2168                 # Reject illegal characters.
2169                 #
2170                 if( preg_match( $rxTc, $dbkey ) ) {
2171                         return false;
2172                 }
2173
2174                 /**
2175                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2176                  * reachable due to the way web browsers deal with 'relative' URLs.
2177                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2178                  */
2179                 if ( strpos( $dbkey, '.' ) !== false &&
2180                      ( $dbkey === '.' || $dbkey === '..' ||
2181                        strpos( $dbkey, './' ) === 0  ||
2182                        strpos( $dbkey, '../' ) === 0 ||
2183                        strpos( $dbkey, '/./' ) !== false ||
2184                        strpos( $dbkey, '/../' ) !== false  ||
2185                        substr( $dbkey, -2 ) == '/.' ||
2186                        substr( $dbkey, -3 ) == '/..' ) )
2187                 {
2188                         return false;
2189                 }
2190
2191                 /**
2192                  * Magic tilde sequences? Nu-uh!
2193                  */
2194                 if( strpos( $dbkey, '~~~' ) !== false ) {
2195                         return false;
2196                 }
2197
2198                 /**
2199                  * Limit the size of titles to 255 bytes.
2200                  * This is typically the size of the underlying database field.
2201                  * We make an exception for special pages, which don't need to be stored
2202                  * in the database, and may edge over 255 bytes due to subpage syntax
2203                  * for long titles, e.g. [[Special:Block/Long name]]
2204                  */
2205                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2206                   strlen( $dbkey ) > 512 )
2207                 {
2208                         return false;
2209                 }
2210
2211                 /**
2212                  * Normally, all wiki links are forced to have
2213                  * an initial capital letter so [[foo]] and [[Foo]]
2214                  * point to the same place.
2215                  *
2216                  * Don't force it for interwikis, since the other
2217                  * site might be case-sensitive.
2218                  */
2219                 $this->mUserCaseDBKey = $dbkey;
2220                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2221                         $dbkey = $wgContLang->ucfirst( $dbkey );
2222                 }
2223
2224                 /**
2225                  * Can't make a link to a namespace alone...
2226                  * "empty" local links can only be self-links
2227                  * with a fragment identifier.
2228                  */
2229                 if( $dbkey == '' &&
2230                         $this->mInterwiki == '' &&
2231                         $this->mNamespace != NS_MAIN ) {
2232                         return false;
2233                 }
2234                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2235                 // IP names are not allowed for accounts, and can only be referring to
2236                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2237                 // there are numerous ways to present the same IP. Having sp:contribs scan
2238                 // them all is silly and having some show the edits and others not is
2239                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2240                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2241                         IP::sanitizeIP( $dbkey ) : $dbkey;
2242                 // Any remaining initial :s are illegal.
2243                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2244                         return false;
2245                 }
2246
2247                 # Fill fields
2248                 $this->mDbkeyform = $dbkey;
2249                 $this->mUrlform = wfUrlencode( $dbkey );
2250
2251                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2252
2253                 return true;
2254         }
2255
2256         /**
2257          * Set the fragment for this title. Removes the first character from the
2258          * specified fragment before setting, so it assumes you're passing it with
2259          * an initial "#".
2260          *
2261          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2262          * Still in active use privately.
2263          *
2264          * @param $fragment \type{\string} text
2265          */
2266         public function setFragment( $fragment ) {
2267                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2268         }
2269
2270         /**
2271          * Get a Title object associated with the talk page of this article
2272          * @return \type{Title} the object for the talk page
2273          */
2274         public function getTalkPage() {
2275                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2276         }
2277
2278         /**
2279          * Get a title object associated with the subject page of this
2280          * talk page
2281          *
2282          * @return \type{Title} the object for the subject page
2283          */
2284         public function getSubjectPage() {
2285                 // Is this the same title?
2286                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2287                 if( $this->getNamespace() == $subjectNS ) {
2288                         return $this;
2289                 }
2290                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2291         }
2292
2293         /**
2294          * Get an array of Title objects linking to this Title
2295          * Also stores the IDs in the link cache.
2296          *
2297          * WARNING: do not use this function on arbitrary user-supplied titles!
2298          * On heavily-used templates it will max out the memory.
2299          *
2300          * @param $options \type{\string} may be FOR UPDATE
2301          * @return \type{\arrayof{Title}} the Title objects linking here
2302          */
2303         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2304                 $linkCache = LinkCache::singleton();
2305
2306                 if ( $options ) {
2307                         $db = wfGetDB( DB_MASTER );
2308                 } else {
2309                         $db = wfGetDB( DB_SLAVE );
2310                 }
2311
2312                 $res = $db->select( array( 'page', $table ),
2313                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2314                         array(
2315                                 "{$prefix}_from=page_id",
2316                                 "{$prefix}_namespace" => $this->getNamespace(),
2317                                 "{$prefix}_title"     => $this->getDBkey() ),
2318                         __METHOD__,
2319                         $options );
2320
2321                 $retVal = array();
2322                 if ( $db->numRows( $res ) ) {
2323                         foreach( $res as $row ) {
2324                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2325                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2326                                         $retVal[] = $titleObj;
2327                                 }
2328                         }
2329                 }
2330                 $db->freeResult( $res );
2331                 return $retVal;
2332         }
2333
2334         /**
2335          * Get an array of Title objects using this Title as a template
2336          * Also stores the IDs in the link cache.
2337          *
2338          * WARNING: do not use this function on arbitrary user-supplied titles!
2339          * On heavily-used templates it will max out the memory.
2340          *
2341          * @param $options \type{\string} may be FOR UPDATE
2342          * @return \type{\arrayof{Title}} the Title objects linking here
2343          */
2344         public function getTemplateLinksTo( $options = '' ) {
2345                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2346         }
2347
2348         /**
2349          * Get an array of Title objects referring to non-existent articles linked from this page
2350          *
2351          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2352          * @param $options \type{\string} may be FOR UPDATE
2353          * @return \type{\arrayof{Title}} the Title objects
2354          */
2355         public function getBrokenLinksFrom( $options = '' ) {
2356                 if ( $this->getArticleId() == 0 ) {
2357                         # All links from article ID 0 are false positives
2358                         return array();
2359                 }
2360
2361                 if ( $options ) {
2362                         $db = wfGetDB( DB_MASTER );
2363                 } else {
2364                         $db = wfGetDB( DB_SLAVE );
2365                 }
2366
2367                 $res = $db->safeQuery(
2368                           "SELECT pl_namespace, pl_title
2369                              FROM !
2370                         LEFT JOIN !
2371                                ON pl_namespace=page_namespace
2372                               AND pl_title=page_title
2373                             WHERE pl_from=?
2374                               AND page_namespace IS NULL
2375                                   !",
2376                         $db->tableName( 'pagelinks' ),
2377                         $db->tableName( 'page' ),
2378                         $this->getArticleId(),
2379                         $options );
2380
2381                 $retVal = array();
2382                 if ( $db->numRows( $res ) ) {
2383                         foreach( $res as $row ) {
2384                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2385                         }
2386                 }
2387                 $db->freeResult( $res );
2388                 return $retVal;
2389         }
2390
2391
2392         /**
2393          * Get a list of URLs to purge from the Squid cache when this
2394          * page changes
2395          *
2396          * @return \type{\arrayof{\string}} the URLs
2397          */
2398         public function getSquidURLs() {
2399                 global $wgContLang;
2400
2401                 $urls = array(
2402                         $this->getInternalURL(),
2403                         $this->getInternalURL( 'action=history' )
2404                 );
2405
2406                 // purge variant urls as well
2407                 if($wgContLang->hasVariants()){
2408                         $variants = $wgContLang->getVariants();
2409                         foreach($variants as $vCode){
2410                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2411                                 $urls[] = $this->getInternalURL('',$vCode);
2412                         }
2413                 }
2414
2415                 return $urls;
2416         }
2417
2418         /**
2419          * Purge all applicable Squid URLs
2420          */
2421         public function purgeSquid() {
2422                 global $wgUseSquid;
2423                 if ( $wgUseSquid ) {
2424                         $urls = $this->getSquidURLs();
2425                         $u = new SquidUpdate( $urls );
2426                         $u->doUpdate();
2427                 }
2428         }
2429
2430         /**
2431          * Move this page without authentication
2432          * @param &$nt \type{Title} the new page Title
2433          */
2434         public function moveNoAuth( &$nt ) {
2435                 return $this->moveTo( $nt, false );
2436         }
2437
2438         /**
2439          * Check whether a given move operation would be valid.
2440          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2441          * @param &$nt \type{Title} the new title
2442          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2443          *      should be checked
2444          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2445          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2446          */
2447         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2448                 global $wgUser;
2449
2450                 $errors = array();
2451                 if( !$nt ) {
2452                         // Normally we'd add this to $errors, but we'll get
2453                         // lots of syntax errors if $nt is not an object
2454                         return array(array('badtitletext'));
2455                 }
2456                 if( $this->equals( $nt ) ) {
2457                         $errors[] = array('selfmove');
2458                 }
2459                 if( !$this->isMovable() ) {
2460                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2461                 }
2462                 if ( $nt->getInterwiki() != '' ) {
2463                         $errors[] = array( 'immobile-target-namespace-iw' );
2464                 }
2465                 if ( !$nt->isMovable() ) {
2466                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2467                 }
2468
2469                 $oldid = $this->getArticleID();
2470                 $newid = $nt->getArticleID();
2471
2472                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2473                         $errors[] = array('articleexists');
2474                 }
2475                 if ( ( '' == $this->getDBkey() ) ||
2476                          ( !$oldid ) ||
2477                      ( '' == $nt->getDBkey() ) ) {
2478                         $errors[] = array('badarticleerror');
2479                 }
2480
2481                 // Image-specific checks
2482                 if( $this->getNamespace() == NS_FILE ) {
2483                         $file = wfLocalFile( $this );
2484                         if( $file->exists() ) {
2485                                 if( $nt->getNamespace() != NS_FILE ) {
2486                                         $errors[] = array('imagenocrossnamespace');
2487                                 }
2488                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2489                                         $errors[] = array('imageinvalidfilename');
2490                                 }
2491                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBKey() ) ) {
2492                                         $errors[] = array('imagetypemismatch');
2493                                 }
2494                         }
2495                 }
2496
2497                 if ( $auth ) {
2498                         $errors = wfMergeErrorArrays( $errors,
2499                                 $this->getUserPermissionsErrors('move', $wgUser),
2500                                 $this->getUserPermissionsErrors('edit', $wgUser),
2501                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2502                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2503                 }
2504
2505                 $match = EditPage::matchSpamRegex( $reason );
2506                 if( $match !== false ) {
2507                         // This is kind of lame, won't display nice
2508                         $errors[] = array('spamprotectiontext');
2509                 }
2510
2511                 $err = null;
2512                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2513                         $errors[] = array('hookaborted', $err);
2514                 }
2515
2516                 # The move is allowed only if (1) the target doesn't exist, or
2517                 # (2) the target is a redirect to the source, and has no history
2518                 # (so we can undo bad moves right after they're done).
2519
2520                 if ( 0 != $newid ) { # Target exists; check for validity
2521                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2522                                 $errors[] = array('articleexists');
2523                         }
2524                 } else {
2525                         $tp = $nt->getTitleProtection();
2526                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2527                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2528                                 $errors[] = array('cantmove-titleprotected');
2529                         }
2530                 }
2531                 if(empty($errors))
2532                         return true;
2533                 return $errors;
2534         }
2535
2536         /**
2537          * Move a title to a new location
2538          * @param &$nt \type{Title} the new title
2539          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2540          *      should be checked
2541          * @param $reason \type{\string} The reason for the move
2542          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2543          *  Ignored if the user doesn't have the suppressredirect right.
2544          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2545          */
2546         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2547                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2548                 if( is_array( $err ) ) {
2549                         return $err;
2550                 }
2551
2552                 $pageid = $this->getArticleID();
2553                 $protected = $this->isProtected();
2554                 if( $nt->exists() ) {
2555                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2556                         $pageCountChange = ($createRedirect ? 0 : -1);
2557                 } else { # Target didn't exist, do normal move.
2558                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2559                         $pageCountChange = ($createRedirect ? 1 : 0);
2560                 }
2561
2562                 if( is_array( $err ) ) {
2563                         return $err;
2564                 }
2565                 $redirid = $this->getArticleID();
2566
2567                 // Category memberships include a sort key which may be customized.
2568                 // If it's left as the default (the page title), we need to update
2569                 // the sort key to match the new title.
2570                 //
2571                 // Be careful to avoid resetting cl_timestamp, which may disturb
2572                 // time-based lists on some sites.
2573                 //
2574                 // Warning -- if the sort key is *explicitly* set to the old title,
2575                 // we can't actually distinguish it from a default here, and it'll
2576                 // be set to the new title even though it really shouldn't.
2577                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2578                 $dbw = wfGetDB( DB_MASTER );
2579                 $dbw->update( 'categorylinks',
2580                         array(
2581                                 'cl_sortkey' => $nt->getPrefixedText(),
2582                                 'cl_timestamp=cl_timestamp' ),
2583                         array(
2584                                 'cl_from' => $pageid,
2585                                 'cl_sortkey' => $this->getPrefixedText() ),
2586                         __METHOD__ );
2587
2588                 if( $protected ) {
2589                         # Protect the redirect title as the title used to be...
2590                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2591                                 array(
2592                                         'pr_page'    => $redirid,
2593                                         'pr_type'    => 'pr_type',
2594                                         'pr_level'   => 'pr_level',
2595                                         'pr_cascade' => 'pr_cascade',
2596                                         'pr_user'    => 'pr_user',
2597                                         'pr_expiry'  => 'pr_expiry'
2598                                 ),
2599                                 array( 'pr_page' => $pageid ),
2600                                 __METHOD__,
2601                                 array( 'IGNORE' )
2602                         );
2603                         # Update the protection log
2604                         $log = new LogPage( 'protect' );
2605                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2606                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2607                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2608                 }
2609
2610                 # Update watchlists
2611                 $oldnamespace = $this->getNamespace() & ~1;
2612                 $newnamespace = $nt->getNamespace() & ~1;
2613                 $oldtitle = $this->getDBkey();
2614                 $newtitle = $nt->getDBkey();
2615
2616                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2617                         WatchedItem::duplicateEntries( $this, $nt );
2618                 }
2619
2620                 # Update search engine
2621                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2622                 $u->doUpdate();
2623                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2624                 $u->doUpdate();
2625
2626                 # Update site_stats
2627                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2628                         # No longer a content page
2629                         # Not viewed, edited, removing
2630                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2631                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2632                         # Now a content page
2633                         # Not viewed, edited, adding
2634                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2635                 } elseif( $pageCountChange ) {
2636                         # Redirect added
2637                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2638                 } else {
2639                         # Nothing special
2640                         $u = false;
2641                 }
2642                 if( $u )
2643                         $u->doUpdate();
2644                 # Update message cache for interface messages
2645                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2646                         global $wgMessageCache;
2647                         $oldarticle = new Article( $this );
2648                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2649                         $newarticle = new Article( $nt );
2650                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2651                 }
2652
2653                 global $wgUser;
2654                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2655                 return true;
2656         }
2657
2658         /**
2659          * Move page to a title which is at present a redirect to the
2660          * source page
2661          *
2662          * @param &$nt \type{Title} the page to move to, which should currently
2663          *      be a redirect
2664          * @param $reason \type{\string} The reason for the move
2665          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2666          *  Ignored if the user doesn't have the suppressredirect right
2667          */
2668         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2669                 global $wgUseSquid, $wgUser;
2670                 $fname = 'Title::moveOverExistingRedirect';
2671                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2672
2673                 if ( $reason ) {
2674                         $comment .= ": $reason";
2675                 }
2676
2677                 $now = wfTimestampNow();
2678                 $newid = $nt->getArticleID();
2679                 $oldid = $this->getArticleID();
2680                 $latest = $this->getLatestRevID();
2681
2682                 $dbw = wfGetDB( DB_MASTER );
2683
2684                 # Delete the old redirect. We don't save it to history since
2685                 # by definition if we've got here it's rather uninteresting.
2686                 # We have to remove it so that the next step doesn't trigger
2687                 # a conflict on the unique namespace+title index...
2688                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2689                 if ( !$dbw->cascadingDeletes() ) {
2690                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2691                         global $wgUseTrackbacks;
2692                         if ($wgUseTrackbacks)
2693                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2694                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2695                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2696                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2697                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2698                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2699                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2700                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2701                 }
2702
2703                 # Save a null revision in the page's history notifying of the move
2704                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2705                 $nullRevId = $nullRevision->insertOn( $dbw );
2706
2707                 $article = new Article( $this );
2708                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2709
2710                 # Change the name of the target page:
2711                 $dbw->update( 'page',
2712                         /* SET */ array(
2713                                 'page_touched'   => $dbw->timestamp($now),
2714                                 'page_namespace' => $nt->getNamespace(),
2715                                 'page_title'     => $nt->getDBkey(),
2716                                 'page_latest'    => $nullRevId,
2717                         ),
2718                         /* WHERE */ array( 'page_id' => $oldid ),
2719                         $fname
2720                 );
2721                 $nt->resetArticleID( $oldid );
2722
2723                 # Recreate the redirect, this time in the other direction.
2724                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2725                         $mwRedir = MagicWord::get( 'redirect' );
2726                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2727                         $redirectArticle = new Article( $this );
2728                         $newid = $redirectArticle->insertOn( $dbw );
2729                         $redirectRevision = new Revision( array(
2730                                 'page'    => $newid,
2731                                 'comment' => $comment,
2732                                 'text'    => $redirectText ) );
2733                         $redirectRevision->insertOn( $dbw );
2734                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2735
2736                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2737
2738                         # Now, we record the link from the redirect to the new title.
2739                         # It should have no other outgoing links...
2740                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2741                         $dbw->insert( 'pagelinks',
2742                                 array(
2743                                         'pl_from'      => $newid,
2744                                         'pl_namespace' => $nt->getNamespace(),
2745                                         'pl_title'     => $nt->getDBkey() ),
2746                                 $fname );
2747                         $redirectSuppressed = false;
2748                 } else {
2749                         $this->resetArticleID( 0 );
2750                         $redirectSuppressed = true;
2751                 }
2752
2753                 # Move an image if this is a file
2754                 if( $this->getNamespace() == NS_FILE ) {
2755                         $file = wfLocalFile( $this );
2756                         if( $file->exists() ) {
2757                                 $status = $file->move( $nt );
2758                                 if( !$status->isOk() ) {
2759                                         $dbw->rollback();
2760                                         return $status->getErrorsArray();
2761                                 }
2762                         }
2763                 }
2764
2765                 # Log the move
2766                 $log = new LogPage( 'move' );
2767                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2768
2769                 # Purge squid
2770                 if ( $wgUseSquid ) {
2771                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2772                         $u = new SquidUpdate( $urls );
2773                         $u->doUpdate();
2774                 }
2775
2776         }
2777
2778         /**
2779          * Move page to non-existing title.
2780          * @param &$nt \type{Title} the new Title
2781          * @param $reason \type{\string} The reason for the move
2782          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2783          *  Ignored if the user doesn't have the suppressredirect right
2784          */
2785         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2786                 global $wgUseSquid, $wgUser;
2787                 $fname = 'MovePageForm::moveToNewTitle';
2788                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2789                 if ( $reason ) {
2790                         $comment .= wfMsgExt( 'colon-separator',
2791                                 array( 'escapenoentities', 'content' ) );
2792                         $comment .= $reason;
2793                 }
2794
2795                 $newid = $nt->getArticleID();
2796                 $oldid = $this->getArticleID();
2797                 $latest = $this->getLatestRevId();
2798
2799                 $dbw = wfGetDB( DB_MASTER );
2800                 $now = $dbw->timestamp();
2801
2802                 # Save a null revision in the page's history notifying of the move
2803                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2804                 $nullRevId = $nullRevision->insertOn( $dbw );
2805
2806                 $article = new Article( $this );
2807                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2808
2809                 # Rename page entry
2810                 $dbw->update( 'page',
2811                         /* SET */ array(
2812                                 'page_touched'   => $now,
2813                                 'page_namespace' => $nt->getNamespace(),
2814                                 'page_title'     => $nt->getDBkey(),
2815                                 'page_latest'    => $nullRevId,
2816                         ),
2817                         /* WHERE */ array( 'page_id' => $oldid ),
2818                         $fname
2819                 );
2820                 $nt->resetArticleID( $oldid );
2821
2822                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2823                         # Insert redirect
2824                         $mwRedir = MagicWord::get( 'redirect' );
2825                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2826                         $redirectArticle = new Article( $this );
2827                         $newid = $redirectArticle->insertOn( $dbw );
2828                         $redirectRevision = new Revision( array(
2829                                 'page'    => $newid,
2830                                 'comment' => $comment,
2831                                 'text'    => $redirectText ) );
2832                         $redirectRevision->insertOn( $dbw );
2833                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2834
2835                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2836
2837                         # Record the just-created redirect's linking to the page
2838                         $dbw->insert( 'pagelinks',
2839                                 array(
2840                                         'pl_from'      => $newid,
2841                                         'pl_namespace' => $nt->getNamespace(),
2842                                         'pl_title'     => $nt->getDBkey() ),
2843                                 $fname );
2844                         $redirectSuppressed = false;
2845                 } else {
2846                         $this->resetArticleID( 0 );
2847                         $redirectSuppressed = true;
2848                 }
2849
2850                 # Move an image if this is a file
2851                 if( $this->getNamespace() == NS_FILE ) {
2852                         $file = wfLocalFile( $this );
2853                         if( $file->exists() ) {
2854                                 $status = $file->move( $nt );
2855                                 if( !$status->isOk() ) {
2856                                         $dbw->rollback();
2857                                         return $status->getErrorsArray();
2858                                 }
2859                         }
2860                 }
2861
2862                 # Log the move
2863                 $log = new LogPage( 'move' );
2864                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2865
2866                 # Purge caches as per article creation
2867                 Article::onArticleCreate( $nt );
2868
2869                 # Purge old title from squid
2870                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2871                 $this->purgeSquid();
2872
2873         }
2874
2875         /**
2876          * Checks if this page is just a one-rev redirect.
2877          * Adds lock, so don't use just for light purposes.
2878          *
2879          * @return \type{\bool} TRUE or FALSE
2880          */
2881         public function isSingleRevRedirect() {
2882                 $dbw = wfGetDB( DB_MASTER );
2883                 # Is it a redirect?
2884                 $row = $dbw->selectRow( 'page',
2885                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
2886                         $this->pageCond(),
2887                         __METHOD__,
2888                         'FOR UPDATE'
2889                 );
2890                 # Cache some fields we may want
2891                 $this->mArticleID = $row ? intval($row->page_id) : 0;
2892                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
2893                 $this->mLatestID = $row ? intval($row->page_latest) : false;
2894                 if( !$this->mRedirect ) {
2895                         return false;
2896                 }
2897                 # Does the article have a history?
2898                 $row = $dbw->selectField( array( 'page', 'revision'),
2899                         'rev_id',
2900                         array( 'page_namespace' => $this->getNamespace(),
2901                                 'page_title' => $this->getDBkey(),
2902                                 'page_id=rev_page',
2903                                 'page_latest != rev_id'
2904                         ),
2905                         __METHOD__,
2906                         'FOR UPDATE'
2907                 );
2908                 # Return true if there was no history
2909                 return ($row === false);
2910         }
2911
2912         /**
2913          * Checks if $this can be moved to a given Title
2914          * - Selects for update, so don't call it unless you mean business
2915          *
2916          * @param &$nt \type{Title} the new title to check
2917          * @return \type{\bool} TRUE or FALSE
2918          */
2919         public function isValidMoveTarget( $nt ) {
2920                 $dbw = wfGetDB( DB_MASTER );
2921                 # Is it an existsing file?
2922                 if( $nt->getNamespace() == NS_FILE ) {
2923                         $file = wfLocalFile( $nt );
2924                         if( $file->exists() ) {
2925                                 wfDebug( __METHOD__ . ": file exists\n" );
2926                                 return false;
2927                         }
2928                 }
2929                 # Is it a redirect with no history?
2930                 if( !$nt->isSingleRevRedirect() ) {
2931                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
2932                         return false;
2933                 }
2934                 # Get the article text
2935                 $rev = Revision::newFromTitle( $nt );
2936                 $text = $rev->getText();
2937                 # Does the redirect point to the source?
2938                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2939                 $m = array();
2940                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2941                         $redirTitle = Title::newFromText( $m[1] );
2942                         if( !is_object( $redirTitle ) ||
2943                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2944                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2945                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2946                                 return false;
2947                         }
2948                 } else {
2949                         # Fail safe
2950                         wfDebug( __METHOD__ . ": failsafe\n" );
2951                         return false;
2952                 }
2953                 return true;
2954         }
2955
2956         /**
2957          * Can this title be added to a user's watchlist?
2958          *
2959          * @return \type{\bool} TRUE or FALSE
2960          */
2961         public function isWatchable() {
2962                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
2963         }
2964
2965         /**
2966          * Get categories to which this Title belongs and return an array of
2967          * categories' names.
2968          *
2969          * @return \type{\array} array an array of parents in the form:
2970          *      $parent => $currentarticle
2971          */
2972         public function getParentCategories() {
2973                 global $wgContLang;
2974
2975                 $titlekey = $this->getArticleId();
2976                 $dbr = wfGetDB( DB_SLAVE );
2977                 $categorylinks = $dbr->tableName( 'categorylinks' );
2978
2979                 # NEW SQL
2980                 $sql = "SELECT * FROM $categorylinks"
2981                      ." WHERE cl_from='$titlekey'"
2982                          ." AND cl_from <> '0'"
2983                          ." ORDER BY cl_sortkey";
2984
2985                 $res = $dbr->query( $sql );
2986
2987                 if( $dbr->numRows( $res ) > 0 ) {
2988                         foreach( $res as $row )
2989                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
2990                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
2991                         $dbr->freeResult( $res );
2992                 } else {
2993                         $data = array();
2994                 }
2995                 return $data;
2996         }
2997
2998         /**
2999          * Get a tree of parent categories
3000          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3001          * @return \type{\array} Tree of parent categories
3002          */
3003         public function getParentCategoryTree( $children = array() ) {
3004                 $stack = array();
3005                 $parents = $this->getParentCategories();
3006
3007                 if( $parents ) {
3008                         foreach( $parents as $parent => $current ) {
3009                                 if ( array_key_exists( $parent, $children ) ) {
3010                                         # Circular reference
3011                                         $stack[$parent] = array();
3012                                 } else {
3013                                         $nt = Title::newFromText($parent);
3014                                         if ( $nt ) {
3015                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3016                                         }
3017                                 }
3018                         }
3019                         return $stack;
3020                 } else {
3021                         return array();
3022                 }
3023         }
3024
3025
3026         /**
3027          * Get an associative array for selecting this title from
3028          * the "page" table
3029          *
3030          * @return \type{\array} Selection array
3031          */
3032         public function pageCond() {
3033                 if( $this->mArticleID > 0 ) {
3034                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3035                         return array( 'page_id' => $this->mArticleID );
3036                 } else {
3037                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3038                 }
3039         }
3040
3041         /**
3042          * Get the revision ID of the previous revision
3043          *
3044          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3045          * @param $flags \type{\int} GAID_FOR_UPDATE
3046          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3047          */
3048         public function getPreviousRevisionID( $revId, $flags=0 ) {
3049                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3050                 return $db->selectField( 'revision', 'rev_id',
3051                         array(
3052                                 'rev_page' => $this->getArticleId($flags),
3053                                 'rev_id < ' . intval( $revId )
3054                         ),
3055                         __METHOD__,
3056                         array( 'ORDER BY' => 'rev_id DESC' )
3057                 );
3058         }
3059
3060         /**
3061          * Get the revision ID of the next revision
3062          *
3063          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3064          * @param $flags \type{\int} GAID_FOR_UPDATE
3065          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3066          */
3067         public function getNextRevisionID( $revId, $flags=0 ) {
3068                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3069                 return $db->selectField( 'revision', 'rev_id',
3070                         array(
3071                                 'rev_page' => $this->getArticleId($flags),
3072                                 'rev_id > ' . intval( $revId )
3073                         ),
3074                         __METHOD__,
3075                         array( 'ORDER BY' => 'rev_id' )
3076                 );
3077         }
3078
3079         /**
3080          * Get the first revision of the page
3081          *
3082          * @param $flags \type{\int} GAID_FOR_UPDATE
3083          * @return Revision (or NULL if page doesn't exist)
3084          */
3085         public function getFirstRevision( $flags=0 ) {
3086                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3087                 $pageId = $this->getArticleId($flags);
3088                 if( !$pageId ) return NULL;
3089                 $row = $db->selectRow( 'revision', '*',
3090                         array( 'rev_page' => $pageId ),
3091                         __METHOD__,
3092                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3093                 );
3094                 if( !$row ) {
3095                         return NULL;
3096                 } else {
3097                         return new Revision( $row );
3098                 }
3099         }
3100
3101         /**
3102          * Check if this is a new page
3103          *
3104          * @return bool
3105          */
3106         public function isNewPage() {
3107                 $dbr = wfGetDB( DB_SLAVE );
3108                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3109         }
3110
3111         /**
3112          * Get the oldest revision timestamp of this page
3113          *
3114          * @return string, MW timestamp
3115          */
3116         public function getEarliestRevTime() {
3117                 $dbr = wfGetDB( DB_SLAVE );
3118                 if( $this->exists() ) {
3119                         $min = $dbr->selectField( 'revision',
3120                                 'MIN(rev_timestamp)',
3121                                 array( 'rev_page' => $this->getArticleId() ),
3122                                 __METHOD__ );
3123                         return wfTimestampOrNull( TS_MW, $min );
3124                 }
3125                 return null;
3126         }
3127
3128         /**
3129          * Get the number of revisions between the given revision IDs.
3130          * Used for diffs and other things that really need it.
3131          *
3132          * @param $old \type{\int} Revision ID.
3133          * @param $new \type{\int} Revision ID.
3134          * @return \type{\int} Number of revisions between these IDs.
3135          */
3136         public function countRevisionsBetween( $old, $new ) {
3137                 $dbr = wfGetDB( DB_SLAVE );
3138                 return $dbr->selectField( 'revision', 'count(*)',
3139                         'rev_page = ' . intval( $this->getArticleId() ) .
3140                         ' AND rev_id > ' . intval( $old ) .
3141                         ' AND rev_id < ' . intval( $new ),
3142                         __METHOD__,
3143                         array( 'USE INDEX' => 'PRIMARY' ) );
3144         }
3145
3146         /**
3147          * Compare with another title.
3148          *
3149          * @param \type{Title} $title
3150          * @return \type{\bool} TRUE or FALSE
3151          */
3152         public function equals( Title $title ) {
3153                 // Note: === is necessary for proper matching of number-like titles.
3154                 return $this->getInterwiki() === $title->getInterwiki()
3155                         && $this->getNamespace() == $title->getNamespace()
3156                         && $this->getDBkey() === $title->getDBkey();
3157         }
3158
3159         /**
3160          * Callback for usort() to do title sorts by (namespace, title)
3161          */
3162         static function compare( $a, $b ) {
3163                 if( $a->getNamespace() == $b->getNamespace() ) {
3164                         return strcmp( $a->getText(), $b->getText() );
3165                 } else {
3166                         return $a->getNamespace() - $b->getNamespace();
3167                 }
3168         }
3169
3170         /**
3171          * Return a string representation of this title
3172          *
3173          * @return \type{\string} String representation of this title
3174          */
3175         public function __toString() {
3176                 return $this->getPrefixedText();
3177         }
3178
3179         /**
3180          * Check if page exists.  For historical reasons, this function simply
3181          * checks for the existence of the title in the page table, and will
3182          * thus return false for interwiki links, special pages and the like.
3183          * If you want to know if a title can be meaningfully viewed, you should
3184          * probably call the isKnown() method instead.
3185          *
3186          * @return \type{\bool} TRUE or FALSE
3187          */
3188         public function exists() {
3189                 return $this->getArticleId() != 0;
3190         }
3191
3192         /**
3193          * Should links to this title be shown as potentially viewable (i.e. as
3194          * "bluelinks"), even if there's no record by this title in the page
3195          * table?
3196          *
3197          * This function is semi-deprecated for public use, as well as somewhat
3198          * misleadingly named.  You probably just want to call isKnown(), which
3199          * calls this function internally.
3200          *
3201          * (ISSUE: Most of these checks are cheap, but the file existence check
3202          * can potentially be quite expensive.  Including it here fixes a lot of
3203          * existing code, but we might want to add an optional parameter to skip
3204          * it and any other expensive checks.)
3205          *
3206          * @return \type{\bool} TRUE or FALSE
3207          */
3208         public function isAlwaysKnown() {
3209                 if( $this->mInterwiki != '' ) {
3210                         return true;  // any interwiki link might be viewable, for all we know
3211                 }
3212                 switch( $this->mNamespace ) {
3213                 case NS_MEDIA:
3214                 case NS_FILE:
3215                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3216                 case NS_SPECIAL:
3217                         return SpecialPage::exists( $this->getDBKey() );  // valid special page
3218                 case NS_MAIN:
3219                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3220                 case NS_MEDIAWIKI:
3221                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3222                         // the full l10n of that language to be loaded. That takes much memory and
3223                         // isn't needed. So we strip the language part away.
3224                         // Also, extension messages which are not loaded, are shown as red, because
3225                         // we don't call MessageCache::loadAllMessages.
3226                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3227                         return wfMsgWeirdKey( $basename );  // known system message
3228                 default:
3229                         return false;
3230                 }
3231         }
3232
3233         /**
3234          * Does this title refer to a page that can (or might) be meaningfully
3235          * viewed?  In particular, this function may be used to determine if
3236          * links to the title should be rendered as "bluelinks" (as opposed to
3237          * "redlinks" to non-existent pages).
3238          *
3239          * @return \type{\bool} TRUE or FALSE
3240          */
3241         public function isKnown() {
3242                 return $this->exists() || $this->isAlwaysKnown();
3243         }
3244
3245         /**
3246         * Is this in a namespace that allows actual pages?
3247         *
3248         * @return \type{\bool} TRUE or FALSE
3249         */
3250         public function canExist() {
3251                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3252         }
3253
3254         /**
3255          * Update page_touched timestamps and send squid purge messages for
3256          * pages linking to this title. May be sent to the job queue depending
3257          * on the number of links. Typically called on create and delete.
3258          */
3259         public function touchLinks() {
3260                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3261                 $u->doUpdate();
3262
3263                 if ( $this->getNamespace() == NS_CATEGORY ) {
3264                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3265                         $u->doUpdate();
3266                 }
3267         }
3268
3269         /**
3270          * Get the last touched timestamp
3271          * @param Database $db, optional db
3272          * @return \type{\string} Last touched timestamp
3273          */
3274         public function getTouched( $db = NULL ) {
3275                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3276                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3277                 return $touched;
3278         }
3279
3280         /**
3281          * Get the timestamp when this page was updated since the user last saw it.
3282          * @param User $user
3283          * @return mixed string/NULL
3284          */
3285         public function getNotificationTimestamp( $user = NULL ) {
3286                 global $wgUser, $wgShowUpdatedMarker;
3287                 // Assume current user if none given
3288                 if( !$user ) $user = $wgUser;
3289                 // Check cache first
3290                 $uid = $user->getId();
3291                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3292                         return $this->mNotificationTimestamp[$uid];
3293                 }
3294                 if( !$uid || !$wgShowUpdatedMarker ) {
3295                         return $this->mNotificationTimestamp[$uid] = false;
3296                 }
3297                 // Don't cache too much!
3298                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3299                         $this->mNotificationTimestamp = array();
3300                 }
3301                 $dbr = wfGetDB( DB_SLAVE );
3302                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3303                         'wl_notificationtimestamp',
3304                         array( 'wl_namespace' => $this->getNamespace(),
3305                                 'wl_title' => $this->getDBkey(),
3306                                 'wl_user' => $user->getId()
3307                         ),
3308                         __METHOD__
3309                 );
3310                 return $this->mNotificationTimestamp[$uid];
3311         }
3312
3313         /**
3314          * Get the trackback URL for this page
3315          * @return \type{\string} Trackback URL
3316          */
3317         public function trackbackURL() {
3318                 global $wgScriptPath, $wgServer;
3319
3320                 return "$wgServer$wgScriptPath/trackback.php?article="
3321                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3322         }
3323
3324         /**
3325          * Get the trackback RDF for this page
3326          * @return \type{\string} Trackback RDF
3327          */
3328         public function trackbackRDF() {
3329                 $url = htmlspecialchars($this->getFullURL());
3330                 $title = htmlspecialchars($this->getText());
3331                 $tburl = $this->trackbackURL();
3332
3333                 // Autodiscovery RDF is placed in comments so HTML validator
3334                 // won't barf. This is a rather icky workaround, but seems
3335                 // frequently used by this kind of RDF thingy.
3336                 //
3337                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3338                 return "<!--
3339 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3340          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3341          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3342 <rdf:Description
3343    rdf:about=\"$url\"
3344    dc:identifier=\"$url\"
3345    dc:title=\"$title\"
3346    trackback:ping=\"$tburl\" />
3347 </rdf:RDF>
3348 -->";
3349         }
3350
3351         /**
3352          * Generate strings used for xml 'id' names in monobook tabs
3353          * @return \type{\string} XML 'id' name
3354          */
3355         public function getNamespaceKey() {
3356                 global $wgContLang;
3357                 switch ($this->getNamespace()) {
3358                         case NS_MAIN:
3359                         case NS_TALK:
3360                                 return 'nstab-main';
3361                         case NS_USER:
3362                         case NS_USER_TALK:
3363                                 return 'nstab-user';
3364                         case NS_MEDIA:
3365                                 return 'nstab-media';
3366                         case NS_SPECIAL:
3367                                 return 'nstab-special';
3368                         case NS_PROJECT:
3369                         case NS_PROJECT_TALK:
3370                                 return 'nstab-project';
3371                         case NS_FILE:
3372                         case NS_FILE_TALK:
3373                                 return 'nstab-image';
3374                         case NS_MEDIAWIKI:
3375                         case NS_MEDIAWIKI_TALK:
3376                                 return 'nstab-mediawiki';
3377                         case NS_TEMPLATE:
3378                         case NS_TEMPLATE_TALK:
3379                                 return 'nstab-template';
3380                         case NS_HELP:
3381                         case NS_HELP_TALK:
3382                                 return 'nstab-help';
3383                         case NS_CATEGORY:
3384                         case NS_CATEGORY_TALK:
3385                                 return 'nstab-category';
3386                         default:
3387                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3388                 }
3389         }
3390
3391         /**
3392          * Returns true if this title resolves to the named special page
3393          * @param $name \type{\string} The special page name
3394          */
3395         public function isSpecial( $name ) {
3396                 if ( $this->getNamespace() == NS_SPECIAL ) {
3397                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3398                         if ( $name == $thisName ) {
3399                                 return true;
3400                         }
3401                 }
3402                 return false;
3403         }
3404
3405         /**
3406          * If the Title refers to a special page alias which is not the local default,
3407          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3408          */
3409         public function fixSpecialName() {
3410                 if ( $this->getNamespace() == NS_SPECIAL ) {
3411                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3412                         if ( $canonicalName ) {
3413                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3414                                 if ( $localName != $this->mDbkeyform ) {
3415                                         return Title::makeTitle( NS_SPECIAL, $localName );
3416                                 }
3417                         }
3418                 }
3419                 return $this;
3420         }
3421
3422         /**
3423          * Is this Title in a namespace which contains content?
3424          * In other words, is this a content page, for the purposes of calculating
3425          * statistics, etc?
3426          *
3427          * @return \type{\bool} TRUE or FALSE
3428          */
3429         public function isContentPage() {
3430                 return MWNamespace::isContent( $this->getNamespace() );
3431         }
3432
3433         /**
3434          * Get all extant redirects to this Title
3435          *
3436          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3437          *            NULL to consider all namespaces
3438          * @return \type{\arrayof{Title}} Redirects to this title
3439          */
3440         public function getRedirectsHere( $ns = null ) {
3441                 $redirs = array();
3442
3443                 $dbr = wfGetDB( DB_SLAVE );
3444                 $where = array(
3445                         'rd_namespace' => $this->getNamespace(),
3446                         'rd_title' => $this->getDBkey(),
3447                         'rd_from = page_id'
3448                 );
3449                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3450
3451                 $res = $dbr->select(
3452                         array( 'redirect', 'page' ),
3453                         array( 'page_namespace', 'page_title' ),
3454                         $where,
3455                         __METHOD__
3456                 );
3457
3458
3459                 foreach( $res as $row ) {
3460                         $redirs[] = self::newFromRow( $row );
3461                 }
3462                 return $redirs;
3463         }
3464
3465         /**
3466          * Check if this Title is a valid redirect target
3467          *
3468          * @return \type{\bool} TRUE or FALSE
3469          */
3470         public function isValidRedirectTarget() {
3471                 global $wgInvalidRedirectTargets;
3472
3473                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3474                 if( $this->isSpecial( 'Userlogout' ) ) {
3475                         return false;
3476                 }
3477
3478                 foreach( $wgInvalidRedirectTargets as $target ) {
3479                         if( $this->isSpecial( $target ) ) {
3480                                 return false;
3481                         }
3482                 }
3483
3484                 return true;
3485         }
3486 }