includes/Title.php

   1 <?php
   2 /**
   3  * Representation a title within %MediaWiki.
   4  *
   5  * See title.txt
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  */
  24
  25 /**
  26  * Represents a title within MediaWiki.
  27  * Optionally may contain an interwiki designation or namespace.
  28  * @note This class can fetch various kinds of data from the database;
  29  *       however, it does so inefficiently.
  30  *
  31  * @internal documentation reviewed 15 Mar 2010
  32  */
  33 class Title {
  34         /** @name Static cache variables */
  35         // @{
  36         static private $titleCache = array();
  37         // @}
  38
  39         /**
  40          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  41          * commonly used titles. On a batch operation this can become a memory leak
  42          * if not bounded. After hitting this many titles reset the cache.
  43          */
  44         const CACHE_MAX = 1000;
  45
  46         /**
  47          * Used to be GAID_FOR_UPDATE define. Used with getArticleID() and friends
  48          * to use the master DB
  49          */
  50         const GAID_FOR_UPDATE = 1;
  51
  52         /**
  53          * @name Private member variables
  54          * Please use the accessor functions instead.
  55          * @private
  56          */
  57         // @{
  58
  59         var $mTextform = '';              // /< Text form (spaces not underscores) of the main part
  60         var $mUrlform = '';               // /< URL-encoded form of the main part
  61         var $mDbkeyform = '';             // /< Main part with underscores
  62         var $mUserCaseDBKey;              // /< DB key with the initial letter in the case specified by the user
  63         var $mNamespace = NS_MAIN;        // /< Namespace index, i.e. one of the NS_xxxx constants
  64         var $mInterwiki = '';             // /< Interwiki prefix (or null string)
  65         var $mFragment;                   // /< Title fragment (i.e. the bit after the #)
  66         var $mArticleID = -1;             // /< Article ID, fetched from the link cache on demand
  67         var $mLatestID = false;           // /< ID of most recent revision
  68         private $mEstimateRevisions;      // /< Estimated number of revisions; null of not loaded
  69         var $mRestrictions = array();     // /< Array of groups allowed to edit this article
  70         var $mOldRestrictions = false;
  71         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  72         var $mCascadingRestrictions;      // Caching the results of getCascadeProtectionSources
  73         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  74         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  75         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  76         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  77         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  78         var $mTitleProtection;            ///< Cached value for getTitleProtection (create protection)
  79         # Don't change the following default, NS_MAIN is hardcoded in several
  80         # places.  See bug 696.
  81         var $mDefaultNamespace = NS_MAIN; // /< Namespace index when there is no namespace
  82                                                                           # Zero except in {{transclusion}} tags
  83         var $mWatched = null;             // /< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  84         var $mLength = -1;                // /< The page length, 0 for special pages
  85         var $mRedirect = null;            // /< Is the article at this title a redirect?
  86         var $mNotificationTimestamp = array(); // /< Associative array of user ID -> timestamp/false
  87         var $mBacklinkCache = null;       // /< Cache of links to this title
  88         var $mHasSubpage;                 // /< Whether a page has any subpages
  89         // @}
  90
  91
  92         /**
  93          * Constructor
  94          */
  95         /*protected*/ function __construct() { }
  96
  97         /**
  98          * Create a new Title from a prefixed DB key
  99          *
 100          * @param $key String the database key, which has underscores
 101          *      instead of spaces, possibly including namespace and
 102          *      interwiki prefixes
 103          * @return Title, or NULL on an error
 104          */
 105         public static function newFromDBkey( $key ) {
 106                 $t = new Title();
 107                 $t->mDbkeyform = $key;
 108                 if ( $t->secureAndSplit() ) {
 109                         return $t;
 110                 } else {
 111                         return null;
 112                 }
 113         }
 114
 115         /**
 116          * Create a new Title from text, such as what one would find in a link. De-
 117          * codes any HTML entities in the text.
 118          *
 119          * @param $text String the link text; spaces, prefixes, and an
 120          *   initial ':' indicating the main namespace are accepted.
 121          * @param $defaultNamespace Int the namespace to use if none is speci-
 122          *   fied by a prefix.  If you want to force a specific namespace even if
 123          *   $text might begin with a namespace prefix, use makeTitle() or
 124          *   makeTitleSafe().
 125          * @throws MWException
 126          * @return Title|null - Title or null on an error.
 127          */
 128         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 129                 if ( is_object( $text ) ) {
 130                         throw new MWException( 'Title::newFromText given an object' );
 131                 }
 132
 133                 /**
 134                  * Wiki pages often contain multiple links to the same page.
 135                  * Title normalization and parsing can become expensive on
 136                  * pages with many links, so we can save a little time by
 137                  * caching them.
 138                  *
 139                  * In theory these are value objects and won't get changed...
 140                  */
 141                 if ( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 142                         return Title::$titleCache[$text];
 143                 }
 144
 145                 # Convert things like &eacute; &#257; or &#x3017; into normalized (bug 14952) text
 146                 $filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );
 147
 148                 $t = new Title();
 149                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 150                 $t->mDefaultNamespace = $defaultNamespace;
 151
 152                 static $cachedcount = 0 ;
 153                 if ( $t->secureAndSplit() ) {
 154                         if ( $defaultNamespace == NS_MAIN ) {
 155                                 if ( $cachedcount >= self::CACHE_MAX ) {
 156                                         # Avoid memory leaks on mass operations...
 157                                         Title::$titleCache = array();
 158                                         $cachedcount = 0;
 159                                 }
 160                                 $cachedcount++;
 161                                 Title::$titleCache[$text] =& $t;
 162                         }
 163                         return $t;
 164                 } else {
 165                         $ret = null;
 166                         return $ret;
 167                 }
 168         }
 169
 170         /**
 171          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 172          *
 173          * Example of wrong and broken code:
 174          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 175          *
 176          * Example of right code:
 177          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 178          *
 179          * Create a new Title from URL-encoded text. Ensures that
 180          * the given title's length does not exceed the maximum.
 181          *
 182          * @param $url String the title, as might be taken from a URL
 183          * @return Title the new object, or NULL on an error
 184          */
 185         public static function newFromURL( $url ) {
 186                 $t = new Title();
 187
 188                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 189                 # but some URLs used it as a space replacement and they still come
 190                 # from some external search tools.
 191                 if ( strpos( self::legalChars(), '+' ) === false ) {
 192                         $url = str_replace( '+', ' ', $url );
 193                 }
 194
 195                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 196                 if ( $t->secureAndSplit() ) {
 197                         return $t;
 198                 } else {
 199                         return null;
 200                 }
 201         }
 202
 203         /**
 204          * Create a new Title from an article ID
 205          *
 206          * @param $id Int the page_id corresponding to the Title to create
 207          * @param $flags Int use Title::GAID_FOR_UPDATE to use master
 208          * @return Title the new object, or NULL on an error
 209          */
 210         public static function newFromID( $id, $flags = 0 ) {
 211                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 212                 $row = $db->selectRow(
 213                         'page',
 214                         array(
 215                                 'page_namespace', 'page_title', 'page_id',
 216                                 'page_len', 'page_is_redirect', 'page_latest',
 217                         ),
 218                         array( 'page_id' => $id ),
 219                         __METHOD__
 220                 );
 221                 if ( $row !== false ) {
 222                         $title = Title::newFromRow( $row );
 223                 } else {
 224                         $title = null;
 225                 }
 226                 return $title;
 227         }
 228
 229         /**
 230          * Make an array of titles from an array of IDs
 231          *
 232          * @param $ids Array of Int Array of IDs
 233          * @return Array of Titles
 234          */
 235         public static function newFromIDs( $ids ) {
 236                 if ( !count( $ids ) ) {
 237                         return array();
 238                 }
 239                 $dbr = wfGetDB( DB_SLAVE );
 240
 241                 $res = $dbr->select(
 242                         'page',
 243                         array(
 244                                 'page_namespace', 'page_title', 'page_id',
 245                                 'page_len', 'page_is_redirect', 'page_latest',
 246                         ),
 247                         array( 'page_id' => $ids ),
 248                         __METHOD__
 249                 );
 250
 251                 $titles = array();
 252                 foreach ( $res as $row ) {
 253                         $titles[] = Title::newFromRow( $row );
 254                 }
 255                 return $titles;
 256         }
 257
 258         /**
 259          * Make a Title object from a DB row
 260          *
 261          * @param $row Object database row (needs at least page_title,page_namespace)
 262          * @return Title corresponding Title
 263          */
 264         public static function newFromRow( $row ) {
 265                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 266                 $t->loadFromRow( $row );
 267                 return $t;
 268         }
 269
 270         /**
 271          * Load Title object fields from a DB row.
 272          * If false is given, the title will be treated as non-existing.
 273          *
 274          * @param $row Object|bool database row
 275          */
 276         public function loadFromRow( $row ) {
 277                 if ( $row ) { // page found
 278                         if ( isset( $row->page_id ) )
 279                                 $this->mArticleID = (int)$row->page_id;
 280                         if ( isset( $row->page_len ) )
 281                                 $this->mLength = (int)$row->page_len;
 282                         if ( isset( $row->page_is_redirect ) )
 283                                 $this->mRedirect = (bool)$row->page_is_redirect;
 284                         if ( isset( $row->page_latest ) )
 285                                 $this->mLatestID = (int)$row->page_latest;
 286                 } else { // page not found
 287                         $this->mArticleID = 0;
 288                         $this->mLength = 0;
 289                         $this->mRedirect = false;
 290                         $this->mLatestID = 0;
 291                 }
 292         }
 293
 294         /**
 295          * Create a new Title from a namespace index and a DB key.
 296          * It's assumed that $ns and $title are *valid*, for instance when
 297          * they came directly from the database or a special page name.
 298          * For convenience, spaces are converted to underscores so that
 299          * eg user_text fields can be used directly.
 300          *
 301          * @param $ns Int the namespace of the article
 302          * @param $title String the unprefixed database key form
 303          * @param $fragment String the link fragment (after the "#")
 304          * @param $interwiki String the interwiki prefix
 305          * @return Title the new object
 306          */
 307         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 308                 $t = new Title();
 309                 $t->mInterwiki = $interwiki;
 310                 $t->mFragment = $fragment;
 311                 $t->mNamespace = $ns = intval( $ns );
 312                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 313                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 314                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 315                 $t->mTextform = str_replace( '_', ' ', $title );
 316                 return $t;
 317         }
 318
 319         /**
 320          * Create a new Title from a namespace index and a DB key.
 321          * The parameters will be checked for validity, which is a bit slower
 322          * than makeTitle() but safer for user-provided data.
 323          *
 324          * @param $ns Int the namespace of the article
 325          * @param $title String database key form
 326          * @param $fragment String the link fragment (after the "#")
 327          * @param $interwiki String interwiki prefix
 328          * @return Title the new object, or NULL on an error
 329          */
 330         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 331                 if ( !MWNamespace::exists( $ns ) ) {
 332                         return null;
 333                 }
 334
 335                 $t = new Title();
 336                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 337                 if ( $t->secureAndSplit() ) {
 338                         return $t;
 339                 } else {
 340                         return null;
 341                 }
 342         }
 343
 344         /**
 345          * Create a new Title for the Main Page
 346          *
 347          * @return Title the new object
 348          */
 349         public static function newMainPage() {
 350                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 351                 // Don't give fatal errors if the message is broken
 352                 if ( !$title ) {
 353                         $title = Title::newFromText( 'Main Page' );
 354                 }
 355                 return $title;
 356         }
 357
 358         /**
 359          * Extract a redirect destination from a string and return the
 360          * Title, or null if the text doesn't contain a valid redirect
 361          * This will only return the very next target, useful for
 362          * the redirect table and other checks that don't need full recursion
 363          *
 364          * @param $text String: Text with possible redirect
 365          * @return Title: The corresponding Title
 366          */
 367         public static function newFromRedirect( $text ) {
 368                 return self::newFromRedirectInternal( $text );
 369         }
 370
 371         /**
 372          * Extract a redirect destination from a string and return the
 373          * Title, or null if the text doesn't contain a valid redirect
 374          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 375          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 376          *
 377          * @param $text String Text with possible redirect
 378          * @return Title
 379          */
 380         public static function newFromRedirectRecurse( $text ) {
 381                 $titles = self::newFromRedirectArray( $text );
 382                 return $titles ? array_pop( $titles ) : null;
 383         }
 384
 385         /**
 386          * Extract a redirect destination from a string and return an
 387          * array of Titles, or null if the text doesn't contain a valid redirect
 388          * The last element in the array is the final destination after all redirects
 389          * have been resolved (up to $wgMaxRedirects times)
 390          *
 391          * @param $text String Text with possible redirect
 392          * @return Array of Titles, with the destination last
 393          */
 394         public static function newFromRedirectArray( $text ) {
 395                 global $wgMaxRedirects;
 396                 $title = self::newFromRedirectInternal( $text );
 397                 if ( is_null( $title ) ) {
 398                         return null;
 399                 }
 400                 // recursive check to follow double redirects
 401                 $recurse = $wgMaxRedirects;
 402                 $titles = array( $title );
 403                 while ( --$recurse > 0 ) {
 404                         if ( $title->isRedirect() ) {
 405                                 $page = WikiPage::factory( $title );
 406                                 $newtitle = $page->getRedirectTarget();
 407                         } else {
 408                                 break;
 409                         }
 410                         // Redirects to some special pages are not permitted
 411                         if ( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 412                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 413                                 $title = $newtitle;
 414                                 $titles[] = $newtitle;
 415                         } else {
 416                                 break;
 417                         }
 418                 }
 419                 return $titles;
 420         }
 421
 422         /**
 423          * Really extract the redirect destination
 424          * Do not call this function directly, use one of the newFromRedirect* functions above
 425          *
 426          * @param $text String Text with possible redirect
 427          * @return Title
 428          */
 429         protected static function newFromRedirectInternal( $text ) {
 430                 global $wgMaxRedirects;
 431                 if ( $wgMaxRedirects < 1 ) {
 432                         //redirects are disabled, so quit early
 433                         return null;
 434                 }
 435                 $redir = MagicWord::get( 'redirect' );
 436                 $text = trim( $text );
 437                 if ( $redir->matchStartAndRemove( $text ) ) {
 438                         // Extract the first link and see if it's usable
 439                         // Ensure that it really does come directly after #REDIRECT
 440                         // Some older redirects included a colon, so don't freak about that!
 441                         $m = array();
 442                         if ( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 443                                 // Strip preceding colon used to "escape" categories, etc.
 444                                 // and URL-decode links
 445                                 if ( strpos( $m[1], '%' ) !== false ) {
 446                                         // Match behavior of inline link parsing here;
 447                                         $m[1] = rawurldecode( ltrim( $m[1], ':' ) );
 448                                 }
 449                                 $title = Title::newFromText( $m[1] );
 450                                 // If the title is a redirect to bad special pages or is invalid, return null
 451                                 if ( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 452                                         return null;
 453                                 }
 454                                 return $title;
 455                         }
 456                 }
 457                 return null;
 458         }
 459
 460         /**
 461          * Get the prefixed DB key associated with an ID
 462          *
 463          * @param $id Int the page_id of the article
 464          * @return Title an object representing the article, or NULL if no such article was found
 465          */
 466         public static function nameOf( $id ) {
 467                 $dbr = wfGetDB( DB_SLAVE );
 468
 469                 $s = $dbr->selectRow(
 470                         'page',
 471                         array( 'page_namespace', 'page_title' ),
 472                         array( 'page_id' => $id ),
 473                         __METHOD__
 474                 );
 475                 if ( $s === false ) {
 476                         return null;
 477                 }
 478
 479                 $n = self::makeName( $s->page_namespace, $s->page_title );
 480                 return $n;
 481         }
 482
 483         /**
 484          * Get a regex character class describing the legal characters in a link
 485          *
 486          * @return String the list of characters, not delimited
 487          */
 488         public static function legalChars() {
 489                 global $wgLegalTitleChars;
 490                 return $wgLegalTitleChars;
 491         }
 492
 493         /**
 494          * Returns a simple regex that will match on characters and sequences invalid in titles.
 495          * Note that this doesn't pick up many things that could be wrong with titles, but that
 496          * replacing this regex with something valid will make many titles valid.
 497          *
 498          * @return String regex string
 499          */
 500         static function getTitleInvalidRegex() {
 501                 static $rxTc = false;
 502                 if ( !$rxTc ) {
 503                         # Matching titles will be held as illegal.
 504                         $rxTc = '/' .
 505                                 # Any character not allowed is forbidden...
 506                                 '[^' . self::legalChars() . ']' .
 507                                 # URL percent encoding sequences interfere with the ability
 508                                 # to round-trip titles -- you can't link to them consistently.
 509                                 '|%[0-9A-Fa-f]{2}' .
 510                                 # XML/HTML character references produce similar issues.
 511                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 512                                 '|&#[0-9]+;' .
 513                                 '|&#x[0-9A-Fa-f]+;' .
 514                                 '/S';
 515                 }
 516
 517                 return $rxTc;
 518         }
 519
 520         /**
 521          * Get a string representation of a title suitable for
 522          * including in a search index
 523          *
 524          * @param $ns Int a namespace index
 525          * @param $title String text-form main part
 526          * @return String a stripped-down title string ready for the search index
 527          */
 528         public static function indexTitle( $ns, $title ) {
 529                 global $wgContLang;
 530
 531                 $lc = SearchEngine::legalSearchChars() . '&#;';
 532                 $t = $wgContLang->normalizeForSearch( $title );
 533                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 534                 $t = $wgContLang->lc( $t );
 535
 536                 # Handle 's, s'
 537                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 538                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 539
 540                 $t = preg_replace( "/\\s+/", ' ', $t );
 541
 542                 if ( $ns == NS_FILE ) {
 543                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 544                 }
 545                 return trim( $t );
 546         }
 547
 548         /**
 549          * Make a prefixed DB key from a DB key and a namespace index
 550          *
 551          * @param $ns Int numerical representation of the namespace
 552          * @param $title String the DB key form the title
 553          * @param $fragment String The link fragment (after the "#")
 554          * @param $interwiki String The interwiki prefix
 555          * @return String the prefixed form of the title
 556          */
 557         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 558                 global $wgContLang;
 559
 560                 $namespace = $wgContLang->getNsText( $ns );
 561                 $name = $namespace == '' ? $title : "$namespace:$title";
 562                 if ( strval( $interwiki ) != '' ) {
 563                         $name = "$interwiki:$name";
 564                 }
 565                 if ( strval( $fragment ) != '' ) {
 566                         $name .= '#' . $fragment;
 567                 }
 568                 return $name;
 569         }
 570
 571         /**
 572          * Escape a text fragment, say from a link, for a URL
 573          *
 574          * @param $fragment string containing a URL or link fragment (after the "#")
 575          * @return String: escaped string
 576          */
 577         static function escapeFragmentForURL( $fragment ) {
 578                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 579                 # fragments appear not to work in IE (at least up to 7) or in at least
 580                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 581                 # to care if they aren't encoded.
 582                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 583         }
 584
 585         /**
 586          * Callback for usort() to do title sorts by (namespace, title)
 587          *
 588          * @param $a Title
 589          * @param $b Title
 590          *
 591          * @return Integer: result of string comparison, or namespace comparison
 592          */
 593         public static function compare( $a, $b ) {
 594                 if ( $a->getNamespace() == $b->getNamespace() ) {
 595                         return strcmp( $a->getText(), $b->getText() );
 596                 } else {
 597                         return $a->getNamespace() - $b->getNamespace();
 598                 }
 599         }
 600
 601         /**
 602          * Determine whether the object refers to a page within
 603          * this project.
 604          *
 605          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 606          */
 607         public function isLocal() {
 608                 if ( $this->mInterwiki != '' ) {
 609                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 610                 } else {
 611                         return true;
 612                 }
 613         }
 614
 615         /**
 616          * Is this Title interwiki?
 617          *
 618          * @return Bool
 619          */
 620         public function isExternal() {
 621                 return ( $this->mInterwiki != '' );
 622         }
 623
 624         /**
 625          * Get the interwiki prefix (or null string)
 626          *
 627          * @return String Interwiki prefix
 628          */
 629         public function getInterwiki() {
 630                 return $this->mInterwiki;
 631         }
 632
 633         /**
 634          * Determine whether the object refers to a page within
 635          * this project and is transcludable.
 636          *
 637          * @return Bool TRUE if this is transcludable
 638          */
 639         public function isTrans() {
 640                 if ( $this->mInterwiki == '' ) {
 641                         return false;
 642                 }
 643
 644                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 645         }
 646
 647         /**
 648          * Returns the DB name of the distant wiki which owns the object.
 649          *
 650          * @return String the DB name
 651          */
 652         public function getTransWikiID() {
 653                 if ( $this->mInterwiki == '' ) {
 654                         return false;
 655                 }
 656
 657                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 658         }
 659
 660         /**
 661          * Get the text form (spaces not underscores) of the main part
 662          *
 663          * @return String Main part of the title
 664          */
 665         public function getText() {
 666                 return $this->mTextform;
 667         }
 668
 669         /**
 670          * Get the URL-encoded form of the main part
 671          *
 672          * @return String Main part of the title, URL-encoded
 673          */
 674         public function getPartialURL() {
 675                 return $this->mUrlform;
 676         }
 677
 678         /**
 679          * Get the main part with underscores
 680          *
 681          * @return String: Main part of the title, with underscores
 682          */
 683         public function getDBkey() {
 684                 return $this->mDbkeyform;
 685         }
 686
 687         /**
 688          * Get the DB key with the initial letter case as specified by the user
 689          *
 690          * @return String DB key
 691          */
 692         function getUserCaseDBKey() {
 693                 return $this->mUserCaseDBKey;
 694         }
 695
 696         /**
 697          * Get the namespace index, i.e. one of the NS_xxxx constants.
 698          *
 699          * @return Integer: Namespace index
 700          */
 701         public function getNamespace() {
 702                 return $this->mNamespace;
 703         }
 704
 705         /**
 706          * Get the namespace text
 707          *
 708          * @return String: Namespace text
 709          */
 710         public function getNsText() {
 711                 global $wgContLang;
 712
 713                 if ( $this->mInterwiki != '' ) {
 714                         // This probably shouldn't even happen. ohh man, oh yuck.
 715                         // But for interwiki transclusion it sometimes does.
 716                         // Shit. Shit shit shit.
 717                         //
 718                         // Use the canonical namespaces if possible to try to
 719                         // resolve a foreign namespace.
 720                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 721                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 722                         }
 723                 }
 724
 725                 if ( $wgContLang->needsGenderDistinction() &&
 726                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 727                         $gender = GenderCache::singleton()->getGenderOf( $this->getText(), __METHOD__ );
 728                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 729                 }
 730
 731                 return $wgContLang->getNsText( $this->mNamespace );
 732         }
 733
 734         /**
 735          * Get the namespace text of the subject (rather than talk) page
 736          *
 737          * @return String Namespace text
 738          */
 739         public function getSubjectNsText() {
 740                 global $wgContLang;
 741                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 742         }
 743
 744         /**
 745          * Get the namespace text of the talk page
 746          *
 747          * @return String Namespace text
 748          */
 749         public function getTalkNsText() {
 750                 global $wgContLang;
 751                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 752         }
 753
 754         /**
 755          * Could this title have a corresponding talk page?
 756          *
 757          * @return Bool TRUE or FALSE
 758          */
 759         public function canTalk() {
 760                 return( MWNamespace::canTalk( $this->mNamespace ) );
 761         }
 762
 763         /**
 764          * Is this in a namespace that allows actual pages?
 765          *
 766          * @return Bool
 767          * @internal note -- uses hardcoded namespace index instead of constants
 768          */
 769         public function canExist() {
 770                 return $this->mNamespace >= NS_MAIN;
 771         }
 772
 773         /**
 774          * Can this title be added to a user's watchlist?
 775          *
 776          * @return Bool TRUE or FALSE
 777          */
 778         public function isWatchable() {
 779                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 780         }
 781
 782         /**
 783          * Returns true if this is a special page.
 784          *
 785          * @return boolean
 786          */
 787         public function isSpecialPage() {
 788                 return $this->getNamespace() == NS_SPECIAL;
 789         }
 790
 791         /**
 792          * Returns true if this title resolves to the named special page
 793          *
 794          * @param $name String The special page name
 795          * @return boolean
 796          */
 797         public function isSpecial( $name ) {
 798                 if ( $this->isSpecialPage() ) {
 799                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 800                         if ( $name == $thisName ) {
 801                                 return true;
 802                         }
 803                 }
 804                 return false;
 805         }
 806
 807         /**
 808          * If the Title refers to a special page alias which is not the local default, resolve
 809          * the alias, and localise the name as necessary.  Otherwise, return $this
 810          *
 811          * @return Title
 812          */
 813         public function fixSpecialName() {
 814                 if ( $this->isSpecialPage() ) {
 815                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 816                         if ( $canonicalName ) {
 817                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 818                                 if ( $localName != $this->mDbkeyform ) {
 819                                         return Title::makeTitle( NS_SPECIAL, $localName );
 820                                 }
 821                         }
 822                 }
 823                 return $this;
 824         }
 825
 826         /**
 827          * Returns true if the title is inside the specified namespace.
 828          *
 829          * Please make use of this instead of comparing to getNamespace()
 830          * This function is much more resistant to changes we may make
 831          * to namespaces than code that makes direct comparisons.
 832          * @param $ns int The namespace
 833          * @return bool
 834          * @since 1.19
 835          */
 836         public function inNamespace( $ns ) {
 837                 return MWNamespace::equals( $this->getNamespace(), $ns );
 838         }
 839
 840         /**
 841          * Returns true if the title is inside one of the specified namespaces.
 842          *
 843          * @param ...$namespaces The namespaces to check for
 844          * @return bool
 845          * @since 1.19
 846          */
 847         public function inNamespaces( /* ... */ ) {
 848                 $namespaces = func_get_args();
 849                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 850                         $namespaces = $namespaces[0];
 851                 }
 852
 853                 foreach ( $namespaces as $ns ) {
 854                         if ( $this->inNamespace( $ns ) ) {
 855                                 return true;
 856                         }
 857                 }
 858
 859                 return false;
 860         }
 861
 862         /**
 863          * Returns true if the title has the same subject namespace as the
 864          * namespace specified.
 865          * For example this method will take NS_USER and return true if namespace
 866          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 867          * as their subject namespace.
 868          *
 869          * This is MUCH simpler than individually testing for equivilance
 870          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 871          * @since 1.19
 872          * @param $ns int
 873          * @return bool
 874          */
 875         public function hasSubjectNamespace( $ns ) {
 876                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 877         }
 878
 879         /**
 880          * Is this Title in a namespace which contains content?
 881          * In other words, is this a content page, for the purposes of calculating
 882          * statistics, etc?
 883          *
 884          * @return Boolean
 885          */
 886         public function isContentPage() {
 887                 return MWNamespace::isContent( $this->getNamespace() );
 888         }
 889
 890         /**
 891          * Would anybody with sufficient privileges be able to move this page?
 892          * Some pages just aren't movable.
 893          *
 894          * @return Bool TRUE or FALSE
 895          */
 896         public function isMovable() {
 897                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 898                         // Interwiki title or immovable namespace. Hooks don't get to override here
 899                         return false;
 900                 }
 901
 902                 $result = true;
 903                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 904                 return $result;
 905         }
 906
 907         /**
 908          * Is this the mainpage?
 909          * @note Title::newFromText seams to be sufficiently optimized by the title
 910          * cache that we don't need to over-optimize by doing direct comparisons and
 911          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 912          * ends up reporting something differently than $title->isMainPage();
 913          *
 914          * @since 1.18
 915          * @return Bool
 916          */
 917         public function isMainPage() {
 918                 return $this->equals( Title::newMainPage() );
 919         }
 920
 921         /**
 922          * Is this a subpage?
 923          *
 924          * @return Bool
 925          */
 926         public function isSubpage() {
 927                 return MWNamespace::hasSubpages( $this->mNamespace )
 928                         ? strpos( $this->getText(), '/' ) !== false
 929                         : false;
 930         }
 931
 932         /**
 933          * Is this a conversion table for the LanguageConverter?
 934          *
 935          * @return Bool
 936          */
 937         public function isConversionTable() {
 938                 return $this->getNamespace() == NS_MEDIAWIKI &&
 939                         strpos( $this->getText(), 'Conversiontable/' ) === 0;
 940         }
 941
 942         /**
 943          * Does that page contain wikitext, or it is JS, CSS or whatever?
 944          *
 945          * @return Bool
 946          */
 947         public function isWikitextPage() {
 948                 $retval = !$this->isCssOrJsPage() && !$this->isCssJsSubpage();
 949                 wfRunHooks( 'TitleIsWikitextPage', array( $this, &$retval ) );
 950                 return $retval;
 951         }
 952
 953         /**
 954          * Could this page contain custom CSS or JavaScript, based
 955          * on the title?
 956          *
 957          * @return Bool
 958          */
 959         public function isCssOrJsPage() {
 960                 $retval = $this->mNamespace == NS_MEDIAWIKI
 961                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
 962                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$retval ) );
 963                 return $retval;
 964         }
 965
 966         /**
 967          * Is this a .css or .js subpage of a user page?
 968          * @return Bool
 969          */
 970         public function isCssJsSubpage() {
 971                 return ( NS_USER == $this->mNamespace and preg_match( "/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
 972         }
 973
 974         /**
 975          * Trim down a .css or .js subpage title to get the corresponding skin name
 976          *
 977          * @return string containing skin name from .css or .js subpage title
 978          */
 979         public function getSkinFromCssJsSubpage() {
 980                 $subpage = explode( '/', $this->mTextform );
 981                 $subpage = $subpage[ count( $subpage ) - 1 ];
 982                 $lastdot = strrpos( $subpage, '.' );
 983                 if ( $lastdot === false )
 984                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
 985                 return substr( $subpage, 0, $lastdot );
 986         }
 987
 988         /**
 989          * Is this a .css subpage of a user page?
 990          *
 991          * @return Bool
 992          */
 993         public function isCssSubpage() {
 994                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.css$/", $this->mTextform ) );
 995         }
 996
 997         /**
 998          * Is this a .js subpage of a user page?
 999          *
1000          * @return Bool
1001          */
1002         public function isJsSubpage() {
1003                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.js$/", $this->mTextform ) );
1004         }
1005
1006         /**
1007          * Is this a talk page of some sort?
1008          *
1009          * @return Bool
1010          */
1011         public function isTalkPage() {
1012                 return MWNamespace::isTalk( $this->getNamespace() );
1013         }
1014
1015         /**
1016          * Get a Title object associated with the talk page of this article
1017          *
1018          * @return Title the object for the talk page
1019          */
1020         public function getTalkPage() {
1021                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1022         }
1023
1024         /**
1025          * Get a title object associated with the subject page of this
1026          * talk page
1027          *
1028          * @return Title the object for the subject page
1029          */
1030         public function getSubjectPage() {
1031                 // Is this the same title?
1032                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1033                 if ( $this->getNamespace() == $subjectNS ) {
1034                         return $this;
1035                 }
1036                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1037         }
1038
1039         /**
1040          * Get the default namespace index, for when there is no namespace
1041          *
1042          * @return Int Default namespace index
1043          */
1044         public function getDefaultNamespace() {
1045                 return $this->mDefaultNamespace;
1046         }
1047
1048         /**
1049          * Get title for search index
1050          *
1051          * @return String a stripped-down title string ready for the
1052          *  search index
1053          */
1054         public function getIndexTitle() {
1055                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1056         }
1057
1058         /**
1059          * Get the Title fragment (i.e.\ the bit after the #) in text form
1060          *
1061          * @return String Title fragment
1062          */
1063         public function getFragment() {
1064                 return $this->mFragment;
1065         }
1066
1067         /**
1068          * Get the fragment in URL form, including the "#" character if there is one
1069          * @return String Fragment in URL form
1070          */
1071         public function getFragmentForURL() {
1072                 if ( $this->mFragment == '' ) {
1073                         return '';
1074                 } else {
1075                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1076                 }
1077         }
1078
1079         /**
1080          * Set the fragment for this title. Removes the first character from the
1081          * specified fragment before setting, so it assumes you're passing it with
1082          * an initial "#".
1083          *
1084          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1085          * Still in active use privately.
1086          *
1087          * @param $fragment String text
1088          */
1089         public function setFragment( $fragment ) {
1090                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1091         }
1092
1093         /**
1094          * Prefix some arbitrary text with the namespace or interwiki prefix
1095          * of this object
1096          *
1097          * @param $name String the text
1098          * @return String the prefixed text
1099          * @private
1100          */
1101         private function prefix( $name ) {
1102                 $p = '';
1103                 if ( $this->mInterwiki != '' ) {
1104                         $p = $this->mInterwiki . ':';
1105                 }
1106
1107                 if ( 0 != $this->mNamespace ) {
1108                         $p .= $this->getNsText() . ':';
1109                 }
1110                 return $p . $name;
1111         }
1112
1113         /**
1114          * Get the prefixed database key form
1115          *
1116          * @return String the prefixed title, with underscores and
1117          *  any interwiki and namespace prefixes
1118          */
1119         public function getPrefixedDBkey() {
1120                 $s = $this->prefix( $this->mDbkeyform );
1121                 $s = str_replace( ' ', '_', $s );
1122                 return $s;
1123         }
1124
1125         /**
1126          * Get the prefixed title with spaces.
1127          * This is the form usually used for display
1128          *
1129          * @return String the prefixed title, with spaces
1130          */
1131         public function getPrefixedText() {
1132                 // @todo FIXME: Bad usage of empty() ?
1133                 if ( empty( $this->mPrefixedText ) ) {
1134                         $s = $this->prefix( $this->mTextform );
1135                         $s = str_replace( '_', ' ', $s );
1136                         $this->mPrefixedText = $s;
1137                 }
1138                 return $this->mPrefixedText;
1139         }
1140
1141         /**
1142          * Return a string representation of this title
1143          *
1144          * @return String representation of this title
1145          */
1146         public function __toString() {
1147                 return $this->getPrefixedText();
1148         }
1149
1150         /**
1151          * Get the prefixed title with spaces, plus any fragment
1152          * (part beginning with '#')
1153          *
1154          * @return String the prefixed title, with spaces and the fragment, including '#'
1155          */
1156         public function getFullText() {
1157                 $text = $this->getPrefixedText();
1158                 if ( $this->mFragment != '' ) {
1159                         $text .= '#' . $this->mFragment;
1160                 }
1161                 return $text;
1162         }
1163
1164         /**
1165          * Get the base page name, i.e. the leftmost part before any slashes
1166          *
1167          * @return String Base name
1168          */
1169         public function getBaseText() {
1170                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1171                         return $this->getText();
1172                 }
1173
1174                 $parts = explode( '/', $this->getText() );
1175                 # Don't discard the real title if there's no subpage involved
1176                 if ( count( $parts ) > 1 ) {
1177                         unset( $parts[count( $parts ) - 1] );
1178                 }
1179                 return implode( '/', $parts );
1180         }
1181
1182         /**
1183          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1184          *
1185          * @return String Subpage name
1186          */
1187         public function getSubpageText() {
1188                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1189                         return( $this->mTextform );
1190                 }
1191                 $parts = explode( '/', $this->mTextform );
1192                 return( $parts[count( $parts ) - 1] );
1193         }
1194
1195         /**
1196          * Get the HTML-escaped displayable text form.
1197          * Used for the title field in <a> tags.
1198          *
1199          * @return String the text, including any prefixes
1200          */
1201         public function getEscapedText() {
1202                 wfDeprecated( __METHOD__, '1.19' );
1203                 return htmlspecialchars( $this->getPrefixedText() );
1204         }
1205
1206         /**
1207          * Get a URL-encoded form of the subpage text
1208          *
1209          * @return String URL-encoded subpage name
1210          */
1211         public function getSubpageUrlForm() {
1212                 $text = $this->getSubpageText();
1213                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1214                 return( $text );
1215         }
1216
1217         /**
1218          * Get a URL-encoded title (not an actual URL) including interwiki
1219          *
1220          * @return String the URL-encoded form
1221          */
1222         public function getPrefixedURL() {
1223                 $s = $this->prefix( $this->mDbkeyform );
1224                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1225                 return $s;
1226         }
1227
1228         /**
1229          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1230          * get{Canonical,Full,Link,Local}URL methods accepted an optional
1231          * second argument named variant. This was deprecated in favor
1232          * of passing an array of option with a "variant" key
1233          * Once $query2 is removed for good, this helper can be dropped
1234          * andthe wfArrayToCGI moved to getLocalURL();
1235          *
1236          * @since 1.19 (r105919)
1237          * @param $query
1238          * @param $query2 bool
1239          * @return String
1240          */
1241         private static function fixUrlQueryArgs( $query, $query2 = false ) {
1242                 if( $query2 !== false ) {
1243                         wfDeprecated( "Title::get{Canonical,Full,Link,Local} method called with a second parameter is deprecated. Add your parameter to an array passed as the first parameter.", "1.19" );
1244                 }
1245                 if ( is_array( $query ) ) {
1246                         $query = wfArrayToCGI( $query );
1247                 }
1248                 if ( $query2 ) {
1249                         if ( is_string( $query2 ) ) {
1250                                 // $query2 is a string, we will consider this to be
1251                                 // a deprecated $variant argument and add it to the query
1252                                 $query2 = wfArrayToCGI( array( 'variant' => $query2 ) );
1253                         } else {
1254                                 $query2 = wfArrayToCGI( $query2 );
1255                         }
1256                         // If we have $query content add a & to it first
1257                         if ( $query ) {
1258                                 $query .= '&';
1259                         }
1260                         // Now append the queries together
1261                         $query .= $query2;
1262                 }
1263                 return $query;
1264         }
1265
1266         /**
1267          * Get a real URL referring to this title, with interwiki link and
1268          * fragment
1269          *
1270          * See getLocalURL for the arguments.
1271          *
1272          * @see self::getLocalURL
1273          * @return String the URL
1274          */
1275         public function getFullURL( $query = '', $query2 = false ) {
1276                 $query = self::fixUrlQueryArgs( $query, $query2 );
1277
1278                 # Hand off all the decisions on urls to getLocalURL
1279                 $url = $this->getLocalURL( $query );
1280
1281                 # Expand the url to make it a full url. Note that getLocalURL has the
1282                 # potential to output full urls for a variety of reasons, so we use
1283                 # wfExpandUrl instead of simply prepending $wgServer
1284                 $url = wfExpandUrl( $url, PROTO_RELATIVE );
1285
1286                 # Finally, add the fragment.
1287                 $url .= $this->getFragmentForURL();
1288
1289                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1290                 return $url;
1291         }
1292
1293         /**
1294          * Get a URL with no fragment or server name.  If this page is generated
1295          * with action=render, $wgServer is prepended.
1296          *
1297
1298          * @param $query string|array an optional query string,
1299          *   not used for interwiki     links. Can be specified as an associative array as well,
1300          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1301          *   Some query patterns will trigger various shorturl path replacements.
1302          * @param $query2 Mixed: An optional secondary query array. This one MUST
1303          *   be an array. If a string is passed it will be interpreted as a deprecated
1304          *   variant argument and urlencoded into a variant= argument.
1305          *   This second query argument will be added to the $query
1306          *   The second parameter is deprecated since 1.19. Pass it as a key,value
1307          *   pair in the first parameter array instead.
1308          *
1309          * @return String the URL
1310          */
1311         public function getLocalURL( $query = '', $query2 = false ) {
1312                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1313
1314                 $query = self::fixUrlQueryArgs( $query, $query2 );
1315
1316                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1317                 if ( $interwiki ) {
1318                         $namespace = $this->getNsText();
1319                         if ( $namespace != '' ) {
1320                                 # Can this actually happen? Interwikis shouldn't be parsed.
1321                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1322                                 $namespace .= ':';
1323                         }
1324                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1325                         $url = wfAppendQuery( $url, $query );
1326                 } else {
1327                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1328                         if ( $query == '' ) {
1329                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1330                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1331                         } else {
1332                                 global $wgVariantArticlePath, $wgActionPaths;
1333                                 $url = false;
1334                                 $matches = array();
1335
1336                                 if ( !empty( $wgActionPaths ) &&
1337                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1338                                 {
1339                                         $action = urldecode( $matches[2] );
1340                                         if ( isset( $wgActionPaths[$action] ) ) {
1341                                                 $query = $matches[1];
1342                                                 if ( isset( $matches[4] ) ) {
1343                                                         $query .= $matches[4];
1344                                                 }
1345                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1346                                                 if ( $query != '' ) {
1347                                                         $url = wfAppendQuery( $url, $query );
1348                                                 }
1349                                         }
1350                                 }
1351
1352                                 if ( $url === false &&
1353                                         $wgVariantArticlePath &&
1354                                         $this->getPageLanguage()->hasVariants() &&
1355                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1356                                 {
1357                                         $variant = urldecode( $matches[1] );
1358                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1359                                                 // Only do the variant replacement if the given variant is a valid
1360                                                 // variant for the page's language.
1361                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1362                                                 $url = str_replace( '$1', $dbkey, $url );
1363                                         }
1364                                 }
1365
1366                                 if ( $url === false ) {
1367                                         if ( $query == '-' ) {
1368                                                 $query = '';
1369                                         }
1370                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1371                                 }
1372                         }
1373
1374                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1375
1376                         // @todo FIXME: This causes breakage in various places when we
1377                         // actually expected a local URL and end up with dupe prefixes.
1378                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1379                                 $url = $wgServer . $url;
1380                         }
1381                 }
1382                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1383                 return $url;
1384         }
1385
1386         /**
1387          * Get a URL that's the simplest URL that will be valid to link, locally,
1388          * to the current Title.  It includes the fragment, but does not include
1389          * the server unless action=render is used (or the link is external).  If
1390          * there's a fragment but the prefixed text is empty, we just return a link
1391          * to the fragment.
1392          *
1393          * The result obviously should not be URL-escaped, but does need to be
1394          * HTML-escaped if it's being output in HTML.
1395          *
1396          * See getLocalURL for the arguments.
1397          *
1398          * @see self::getLocalURL
1399          * @return String the URL
1400          */
1401         public function getLinkURL( $query = '', $query2 = false ) {
1402                 wfProfileIn( __METHOD__ );
1403                 if ( $this->isExternal() ) {
1404                         $ret = $this->getFullURL( $query, $query2 );
1405                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1406                         $ret = $this->getFragmentForURL();
1407                 } else {
1408                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1409                 }
1410                 wfProfileOut( __METHOD__ );
1411                 return $ret;
1412         }
1413
1414         /**
1415          * Get an HTML-escaped version of the URL form, suitable for
1416          * using in a link, without a server name or fragment
1417          *
1418          * See getLocalURL for the arguments.
1419          *
1420          * @see self::getLocalURL
1421          * @param $query string
1422          * @param $query2 bool|string
1423          * @return String the URL
1424          */
1425         public function escapeLocalURL( $query = '', $query2 = false ) {
1426                 wfDeprecated( __METHOD__, '1.19' );
1427                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1428         }
1429
1430         /**
1431          * Get an HTML-escaped version of the URL form, suitable for
1432          * using in a link, including the server name and fragment
1433          *
1434          * See getLocalURL for the arguments.
1435          *
1436          * @see self::getLocalURL
1437          * @return String the URL
1438          */
1439         public function escapeFullURL( $query = '', $query2 = false ) {
1440                 wfDeprecated( __METHOD__, '1.19' );
1441                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1442         }
1443
1444         /**
1445          * Get the URL form for an internal link.
1446          * - Used in various Squid-related code, in case we have a different
1447          * internal hostname for the server from the exposed one.
1448          *
1449          * This uses $wgInternalServer to qualify the path, or $wgServer
1450          * if $wgInternalServer is not set. If the server variable used is
1451          * protocol-relative, the URL will be expanded to http://
1452          *
1453          * See getLocalURL for the arguments.
1454          *
1455          * @see self::getLocalURL
1456          * @return String the URL
1457          */
1458         public function getInternalURL( $query = '', $query2 = false ) {
1459                 global $wgInternalServer, $wgServer;
1460                 $query = self::fixUrlQueryArgs( $query, $query2 );
1461                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1462                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1463                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1464                 return $url;
1465         }
1466
1467         /**
1468          * Get the URL for a canonical link, for use in things like IRC and
1469          * e-mail notifications. Uses $wgCanonicalServer and the
1470          * GetCanonicalURL hook.
1471          *
1472          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1473          *
1474          * See getLocalURL for the arguments.
1475          *
1476          * @see self::getLocalURL
1477          * @return string The URL
1478          * @since 1.18
1479          */
1480         public function getCanonicalURL( $query = '', $query2 = false ) {
1481                 $query = self::fixUrlQueryArgs( $query, $query2 );
1482                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1483                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1484                 return $url;
1485         }
1486
1487         /**
1488          * HTML-escaped version of getCanonicalURL()
1489          *
1490          * See getLocalURL for the arguments.
1491          *
1492          * @see self::getLocalURL
1493          * @since 1.18
1494          * @return string
1495          */
1496         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1497                 wfDeprecated( __METHOD__, '1.19' );
1498                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1499         }
1500
1501         /**
1502          * Get the edit URL for this Title
1503          *
1504          * @return String the URL, or a null string if this is an
1505          *  interwiki link
1506          */
1507         public function getEditURL() {
1508                 if ( $this->mInterwiki != '' ) {
1509                         return '';
1510                 }
1511                 $s = $this->getLocalURL( 'action=edit' );
1512
1513                 return $s;
1514         }
1515
1516         /**
1517          * Is $wgUser watching this page?
1518          *
1519          * @deprecated in 1.20; use User::isWatched() instead.
1520          * @return Bool
1521          */
1522         public function userIsWatching() {
1523                 global $wgUser;
1524
1525                 if ( is_null( $this->mWatched ) ) {
1526                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1527                                 $this->mWatched = false;
1528                         } else {
1529                                 $this->mWatched = $wgUser->isWatched( $this );
1530                         }
1531                 }
1532                 return $this->mWatched;
1533         }
1534
1535         /**
1536          * Can $wgUser read this page?
1537          *
1538          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1539          * @return Bool
1540          * @todo fold these checks into userCan()
1541          */
1542         public function userCanRead() {
1543                 wfDeprecated( __METHOD__, '1.19' );
1544                 return $this->userCan( 'read' );
1545         }
1546
1547         /**
1548          * Can $user perform $action on this page?
1549          * This skips potentially expensive cascading permission checks
1550          * as well as avoids expensive error formatting
1551          *
1552          * Suitable for use for nonessential UI controls in common cases, but
1553          * _not_ for functional access control.
1554          *
1555          * May provide false positives, but should never provide a false negative.
1556          *
1557          * @param $action String action that permission needs to be checked for
1558          * @param $user User to check (since 1.19); $wgUser will be used if not
1559          *              provided.
1560          * @return Bool
1561          */
1562         public function quickUserCan( $action, $user = null ) {
1563                 return $this->userCan( $action, $user, false );
1564         }
1565
1566         /**
1567          * Can $user perform $action on this page?
1568          *
1569          * @param $action String action that permission needs to be checked for
1570          * @param $user User to check (since 1.19); $wgUser will be used if not
1571          *   provided.
1572          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1573          *   unnecessary queries.
1574          * @return Bool
1575          */
1576         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1577                 if ( !$user instanceof User ) {
1578                         global $wgUser;
1579                         $user = $wgUser;
1580                 }
1581                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1582         }
1583
1584         /**
1585          * Can $user perform $action on this page?
1586          *
1587          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1588          *
1589          * @param $action String action that permission needs to be checked for
1590          * @param $user User to check
1591          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1592          *   queries by skipping checks for cascading protections and user blocks.
1593          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1594          *   whose corresponding errors may be ignored.
1595          * @return Array of arguments to wfMsg to explain permissions problems.
1596          */
1597         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1598                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1599
1600                 // Remove the errors being ignored.
1601                 foreach ( $errors as $index => $error ) {
1602                         $error_key = is_array( $error ) ? $error[0] : $error;
1603
1604                         if ( in_array( $error_key, $ignoreErrors ) ) {
1605                                 unset( $errors[$index] );
1606                         }
1607                 }
1608
1609                 return $errors;
1610         }
1611
1612         /**
1613          * Permissions checks that fail most often, and which are easiest to test.
1614          *
1615          * @param $action String the action to check
1616          * @param $user User user to check
1617          * @param $errors Array list of current errors
1618          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1619          * @param $short Boolean short circuit on first error
1620          *
1621          * @return Array list of errors
1622          */
1623         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1624                 if ( $action == 'create' ) {
1625                         if ( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1626                                  ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1627                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1628                         }
1629                 } elseif ( $action == 'move' ) {
1630                         if ( !$user->isAllowed( 'move-rootuserpages' )
1631                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1632                                 // Show user page-specific message only if the user can move other pages
1633                                 $errors[] = array( 'cant-move-user-page' );
1634                         }
1635
1636                         // Check if user is allowed to move files if it's a file
1637                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1638                                 $errors[] = array( 'movenotallowedfile' );
1639                         }
1640
1641                         if ( !$user->isAllowed( 'move' ) ) {
1642                                 // User can't move anything
1643                                 global $wgGroupPermissions;
1644                                 $userCanMove = false;
1645                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1646                                         $userCanMove = $wgGroupPermissions['user']['move'];
1647                                 }
1648                                 $autoconfirmedCanMove = false;
1649                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1650                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1651                                 }
1652                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1653                                         // custom message if logged-in users without any special rights can move
1654                                         $errors[] = array( 'movenologintext' );
1655                                 } else {
1656                                         $errors[] = array( 'movenotallowed' );
1657                                 }
1658                         }
1659                 } elseif ( $action == 'move-target' ) {
1660                         if ( !$user->isAllowed( 'move' ) ) {
1661                                 // User can't move anything
1662                                 $errors[] = array( 'movenotallowed' );
1663                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1664                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1665                                 // Show user page-specific message only if the user can move other pages
1666                                 $errors[] = array( 'cant-move-to-user-page' );
1667                         }
1668                 } elseif ( !$user->isAllowed( $action ) ) {
1669                         $errors[] = $this->missingPermissionError( $action, $short );
1670                 }
1671
1672                 return $errors;
1673         }
1674
1675         /**
1676          * Add the resulting error code to the errors array
1677          *
1678          * @param $errors Array list of current errors
1679          * @param $result Mixed result of errors
1680          *
1681          * @return Array list of errors
1682          */
1683         private function resultToError( $errors, $result ) {
1684                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1685                         // A single array representing an error
1686                         $errors[] = $result;
1687                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1688                         // A nested array representing multiple errors
1689                         $errors = array_merge( $errors, $result );
1690                 } elseif ( $result !== '' && is_string( $result ) ) {
1691                         // A string representing a message-id
1692                         $errors[] = array( $result );
1693                 } elseif ( $result === false ) {
1694                         // a generic "We don't want them to do that"
1695                         $errors[] = array( 'badaccess-group0' );
1696                 }
1697                 return $errors;
1698         }
1699
1700         /**
1701          * Check various permission hooks
1702          *
1703          * @param $action String the action to check
1704          * @param $user User user to check
1705          * @param $errors Array list of current errors
1706          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1707          * @param $short Boolean short circuit on first error
1708          *
1709          * @return Array list of errors
1710          */
1711         private function checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1712                 // Use getUserPermissionsErrors instead
1713                 $result = '';
1714                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1715                         return $result ? array() : array( array( 'badaccess-group0' ) );
1716                 }
1717                 // Check getUserPermissionsErrors hook
1718                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1719                         $errors = $this->resultToError( $errors, $result );
1720                 }
1721                 // Check getUserPermissionsErrorsExpensive hook
1722                 if ( $doExpensiveQueries && !( $short && count( $errors ) > 0 ) &&
1723                          !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1724                         $errors = $this->resultToError( $errors, $result );
1725                 }
1726
1727                 return $errors;
1728         }
1729
1730         /**
1731          * Check permissions on special pages & namespaces
1732          *
1733          * @param $action String the action to check
1734          * @param $user User user to check
1735          * @param $errors Array list of current errors
1736          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1737          * @param $short Boolean short circuit on first error
1738          *
1739          * @return Array list of errors
1740          */
1741         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1742                 # Only 'createaccount' and 'execute' can be performed on
1743                 # special pages, which don't actually exist in the DB.
1744                 $specialOKActions = array( 'createaccount', 'execute', 'read' );
1745                 if ( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions ) ) {
1746                         $errors[] = array( 'ns-specialprotected' );
1747                 }
1748
1749                 # Check $wgNamespaceProtection for restricted namespaces
1750                 if ( $this->isNamespaceProtected( $user ) ) {
1751                         $ns = $this->mNamespace == NS_MAIN ?
1752                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1753                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1754                                 array( 'protectedinterface' ) : array( 'namespaceprotected',  $ns );
1755                 }
1756
1757                 return $errors;
1758         }
1759
1760         /**
1761          * Check CSS/JS sub-page permissions
1762          *
1763          * @param $action String the action to check
1764          * @param $user User user to check
1765          * @param $errors Array list of current errors
1766          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1767          * @param $short Boolean short circuit on first error
1768          *
1769          * @return Array list of errors
1770          */
1771         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1772                 # Protect css/js subpages of user pages
1773                 # XXX: this might be better using restrictions
1774                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1775                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1776                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1777                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1778                                 $errors[] = array( 'customcssprotected' );
1779                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1780                                 $errors[] = array( 'customjsprotected' );
1781                         }
1782                 }
1783
1784                 return $errors;
1785         }
1786
1787         /**
1788          * Check against page_restrictions table requirements on this
1789          * page. The user must possess all required rights for this
1790          * action.
1791          *
1792          * @param $action String the action to check
1793          * @param $user User user to check
1794          * @param $errors Array list of current errors
1795          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1796          * @param $short Boolean short circuit on first error
1797          *
1798          * @return Array list of errors
1799          */
1800         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1801                 foreach ( $this->getRestrictions( $action ) as $right ) {
1802                         // Backwards compatibility, rewrite sysop -> protect
1803                         if ( $right == 'sysop' ) {
1804                                 $right = 'protect';
1805                         }
1806                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1807                                 // Users with 'editprotected' permission can edit protected pages
1808                                 // without cascading option turned on.
1809                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1810                                         || $this->mCascadeRestriction )
1811                                 {
1812                                         $errors[] = array( 'protectedpagetext', $right );
1813                                 }
1814                         }
1815                 }
1816
1817                 return $errors;
1818         }
1819
1820         /**
1821          * Check restrictions on cascading pages.
1822          *
1823          * @param $action String the action to check
1824          * @param $user User to check
1825          * @param $errors Array list of current errors
1826          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1827          * @param $short Boolean short circuit on first error
1828          *
1829          * @return Array list of errors
1830          */
1831         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1832                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1833                         # We /could/ use the protection level on the source page, but it's
1834                         # fairly ugly as we have to establish a precedence hierarchy for pages
1835                         # included by multiple cascade-protected pages. So just restrict
1836                         # it to people with 'protect' permission, as they could remove the
1837                         # protection anyway.
1838                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1839                         # Cascading protection depends on more than this page...
1840                         # Several cascading protected pages may include this page...
1841                         # Check each cascading level
1842                         # This is only for protection restrictions, not for all actions
1843                         if ( isset( $restrictions[$action] ) ) {
1844                                 foreach ( $restrictions[$action] as $right ) {
1845                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1846                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1847                                                 $pages = '';
1848                                                 foreach ( $cascadingSources as $page )
1849                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1850                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1851                                         }
1852                                 }
1853                         }
1854                 }
1855
1856                 return $errors;
1857         }
1858
1859         /**
1860          * Check action permissions not already checked in checkQuickPermissions
1861          *
1862          * @param $action String the action to check
1863          * @param $user User to check
1864          * @param $errors Array list of current errors
1865          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1866          * @param $short Boolean short circuit on first error
1867          *
1868          * @return Array list of errors
1869          */
1870         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1871                 global $wgDeleteRevisionsLimit, $wgLang;
1872
1873                 if ( $action == 'protect' ) {
1874                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1875                                 // If they can't edit, they shouldn't protect.
1876                                 $errors[] = array( 'protect-cantedit' );
1877                         }
1878                 } elseif ( $action == 'create' ) {
1879                         $title_protection = $this->getTitleProtection();
1880                         if( $title_protection ) {
1881                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1882                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1883                                 }
1884                                 if( $title_protection['pt_create_perm'] == '' ||
1885                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1886                                 {
1887                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1888                                 }
1889                         }
1890                 } elseif ( $action == 'move' ) {
1891                         // Check for immobile pages
1892                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1893                                 // Specific message for this case
1894                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1895                         } elseif ( !$this->isMovable() ) {
1896                                 // Less specific message for rarer cases
1897                                 $errors[] = array( 'immobile-source-page' );
1898                         }
1899                 } elseif ( $action == 'move-target' ) {
1900                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1901                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1902                         } elseif ( !$this->isMovable() ) {
1903                                 $errors[] = array( 'immobile-target-page' );
1904                         }
1905                 } elseif ( $action == 'delete' ) {
1906                         if ( $doExpensiveQueries && $wgDeleteRevisionsLimit
1907                                 && !$this->userCan( 'bigdelete', $user ) && $this->isBigDeletion() )
1908                         {
1909                                 $errors[] = array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) );
1910                         }
1911                 }
1912                 return $errors;
1913         }
1914
1915         /**
1916          * Check that the user isn't blocked from editting.
1917          *
1918          * @param $action String the action to check
1919          * @param $user User to check
1920          * @param $errors Array list of current errors
1921          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1922          * @param $short Boolean short circuit on first error
1923          *
1924          * @return Array list of errors
1925          */
1926         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
1927                 // Account creation blocks handled at userlogin.
1928                 // Unblocking handled in SpecialUnblock
1929                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
1930                         return $errors;
1931                 }
1932
1933                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
1934
1935                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1936                         $errors[] = array( 'confirmedittext' );
1937                 }
1938
1939                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
1940                         // Don't block the user from editing their own talk page unless they've been
1941                         // explicitly blocked from that too.
1942                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
1943                         $block = $user->getBlock();
1944
1945                         // This is from OutputPage::blockedPage
1946                         // Copied at r23888 by werdna
1947
1948                         $id = $user->blockedBy();
1949                         $reason = $user->blockedFor();
1950                         if ( $reason == '' ) {
1951                                 $reason = wfMsg( 'blockednoreason' );
1952                         }
1953                         $ip = $user->getRequest()->getIP();
1954
1955                         if ( is_numeric( $id ) ) {
1956                                 $name = User::whoIs( $id );
1957                         } else {
1958                                 $name = $id;
1959                         }
1960
1961                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1962                         $blockid = $block->getId();
1963                         $blockExpiry = $block->getExpiry();
1964                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $block->mTimestamp ), true );
1965                         if ( $blockExpiry == 'infinity' ) {
1966                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
1967                         } else {
1968                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1969                         }
1970
1971                         $intended = strval( $block->getTarget() );
1972
1973                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
1974                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1975                 }
1976
1977                 return $errors;
1978         }
1979
1980         /**
1981          * Check that the user is allowed to read this page.
1982          *
1983          * @param $action String the action to check
1984          * @param $user User to check
1985          * @param $errors Array list of current errors
1986          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1987          * @param $short Boolean short circuit on first error
1988          *
1989          * @return Array list of errors
1990          */
1991         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1992                 global $wgWhitelistRead, $wgGroupPermissions, $wgRevokePermissions;
1993                 static $useShortcut = null;
1994
1995                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1996                 if ( is_null( $useShortcut ) ) {
1997                         $useShortcut = true;
1998                         if ( empty( $wgGroupPermissions['*']['read'] ) ) {
1999                                 # Not a public wiki, so no shortcut
2000                                 $useShortcut = false;
2001                         } elseif ( !empty( $wgRevokePermissions ) ) {
2002                                 /**
2003                                  * Iterate through each group with permissions being revoked (key not included since we don't care
2004                                  * what the group name is), then check if the read permission is being revoked. If it is, then
2005                                  * we don't use the shortcut below since the user might not be able to read, even though anon
2006                                  * reading is allowed.
2007                                  */
2008                                 foreach ( $wgRevokePermissions as $perms ) {
2009                                         if ( !empty( $perms['read'] ) ) {
2010                                                 # We might be removing the read right from the user, so no shortcut
2011                                                 $useShortcut = false;
2012                                                 break;
2013                                         }
2014                                 }
2015                         }
2016                 }
2017
2018                 $whitelisted = false;
2019                 if ( $useShortcut ) {
2020                         # Shortcut for public wikis, allows skipping quite a bit of code
2021                         $whitelisted = true;
2022                 } elseif ( $user->isAllowed( 'read' ) ) {
2023                         # If the user is allowed to read pages, he is allowed to read all pages
2024                         $whitelisted = true;
2025                 } elseif ( $this->isSpecial( 'Userlogin' )
2026                         || $this->isSpecial( 'ChangePassword' )
2027                         || $this->isSpecial( 'PasswordReset' )
2028                 ) {
2029                         # Always grant access to the login page.
2030                         # Even anons need to be able to log in.
2031                         $whitelisted = true;
2032                 } elseif ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2033                         # Time to check the whitelist
2034                         # Only do these checks is there's something to check against
2035                         $name = $this->getPrefixedText();
2036                         $dbName = $this->getPrefixedDBKey();
2037
2038                         // Check for explicit whitelisting with and without underscores
2039                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2040                                 $whitelisted = true;
2041                         } elseif ( $this->getNamespace() == NS_MAIN ) {
2042                                 # Old settings might have the title prefixed with
2043                                 # a colon for main-namespace pages
2044                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2045                                         $whitelisted = true;
2046                                 }
2047                         } elseif ( $this->isSpecialPage() ) {
2048                                 # If it's a special page, ditch the subpage bit and check again
2049                                 $name = $this->getDBkey();
2050                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2051                                 if ( $name !== false ) {
2052                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2053                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2054                                                 $whitelisted = true;
2055                                         }
2056                                 }
2057                         }
2058                 }
2059
2060                 if ( !$whitelisted ) {
2061                         # If the title is not whitelisted, give extensions a chance to do so...
2062                         wfRunHooks( 'TitleReadWhitelist', array( $this, $user, &$whitelisted ) );
2063                         if ( !$whitelisted ) {
2064                                 $errors[] = $this->missingPermissionError( $action, $short );
2065                         }
2066                 }
2067
2068                 return $errors;
2069         }
2070
2071         /**
2072          * Get a description array when the user doesn't have the right to perform
2073          * $action (i.e. when User::isAllowed() returns false)
2074          *
2075          * @param $action String the action to check
2076          * @param $short Boolean short circuit on first error
2077          * @return Array list of errors
2078          */
2079         private function missingPermissionError( $action, $short ) {
2080                 // We avoid expensive display logic for quickUserCan's and such
2081                 if ( $short ) {
2082                         return array( 'badaccess-group0' );
2083                 }
2084
2085                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2086                         User::getGroupsWithPermission( $action ) );
2087
2088                 if ( count( $groups ) ) {
2089                         global $wgLang;
2090                         return array(
2091                                 'badaccess-groups',
2092                                 $wgLang->commaList( $groups ),
2093                                 count( $groups )
2094                         );
2095                 } else {
2096                         return array( 'badaccess-group0' );
2097                 }
2098         }
2099
2100         /**
2101          * Can $user perform $action on this page? This is an internal function,
2102          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2103          * checks on wfReadOnly() and blocks)
2104          *
2105          * @param $action String action that permission needs to be checked for
2106          * @param $user User to check
2107          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2108          * @param $short Bool Set this to true to stop after the first permission error.
2109          * @return Array of arrays of the arguments to wfMsg to explain permissions problems.
2110          */
2111         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2112                 wfProfileIn( __METHOD__ );
2113
2114                 # Read has special handling
2115                 if ( $action == 'read' ) {
2116                         $checks = array(
2117                                 'checkPermissionHooks',
2118                                 'checkReadPermissions',
2119                         );
2120                 } else {
2121                         $checks = array(
2122                                 'checkQuickPermissions',
2123                                 'checkPermissionHooks',
2124                                 'checkSpecialsAndNSPermissions',
2125                                 'checkCSSandJSPermissions',
2126                                 'checkPageRestrictions',
2127                                 'checkCascadingSourcesRestrictions',
2128                                 'checkActionPermissions',
2129                                 'checkUserBlock'
2130                         );
2131                 }
2132
2133                 $errors = array();
2134                 while( count( $checks ) > 0 &&
2135                                 !( $short && count( $errors ) > 0 ) ) {
2136                         $method = array_shift( $checks );
2137                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2138                 }
2139
2140                 wfProfileOut( __METHOD__ );
2141                 return $errors;
2142         }
2143
2144         /**
2145          * Protect css subpages of user pages: can $wgUser edit
2146          * this page?
2147          *
2148          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2149          * @return Bool
2150          */
2151         public function userCanEditCssSubpage() {
2152                 global $wgUser;
2153                 wfDeprecated( __METHOD__, '1.19' );
2154                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2155                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2156         }
2157
2158         /**
2159          * Protect js subpages of user pages: can $wgUser edit
2160          * this page?
2161          *
2162          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2163          * @return Bool
2164          */
2165         public function userCanEditJsSubpage() {
2166                 global $wgUser;
2167                 wfDeprecated( __METHOD__, '1.19' );
2168                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2169                            || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2170         }
2171
2172         /**
2173          * Get a filtered list of all restriction types supported by this wiki.
2174          * @param bool $exists True to get all restriction types that apply to
2175          * titles that do exist, False for all restriction types that apply to
2176          * titles that do not exist
2177          * @return array
2178          */
2179         public static function getFilteredRestrictionTypes( $exists = true ) {
2180                 global $wgRestrictionTypes;
2181                 $types = $wgRestrictionTypes;
2182                 if ( $exists ) {
2183                         # Remove the create restriction for existing titles
2184                         $types = array_diff( $types, array( 'create' ) );
2185                 } else {
2186                         # Only the create and upload restrictions apply to non-existing titles
2187                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2188                 }
2189                 return $types;
2190         }
2191
2192         /**
2193          * Returns restriction types for the current Title
2194          *
2195          * @return array applicable restriction types
2196          */
2197         public function getRestrictionTypes() {
2198                 if ( $this->isSpecialPage() ) {
2199                         return array();
2200                 }
2201
2202                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2203
2204                 if ( $this->getNamespace() != NS_FILE ) {
2205                         # Remove the upload restriction for non-file titles
2206                         $types = array_diff( $types, array( 'upload' ) );
2207                 }
2208
2209                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2210
2211                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2212                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2213
2214                 return $types;
2215         }
2216
2217         /**
2218          * Is this title subject to title protection?
2219          * Title protection is the one applied against creation of such title.
2220          *
2221          * @return Mixed An associative array representing any existent title
2222          *   protection, or false if there's none.
2223          */
2224         private function getTitleProtection() {
2225                 // Can't protect pages in special namespaces
2226                 if ( $this->getNamespace() < 0 ) {
2227                         return false;
2228                 }
2229
2230                 // Can't protect pages that exist.
2231                 if ( $this->exists() ) {
2232                         return false;
2233                 }
2234
2235                 if ( !isset( $this->mTitleProtection ) ) {
2236                         $dbr = wfGetDB( DB_SLAVE );
2237                         $res = $dbr->select( 'protected_titles', '*',
2238                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2239                                 __METHOD__ );
2240
2241                         // fetchRow returns false if there are no rows.
2242                         $this->mTitleProtection = $dbr->fetchRow( $res );
2243                 }
2244                 return $this->mTitleProtection;
2245         }
2246
2247         /**
2248          * Update the title protection status
2249          *
2250          * @deprecated in 1.19; will be removed in 1.20. Use WikiPage::doUpdateRestrictions() instead.
2251          * @param $create_perm String Permission required for creation
2252          * @param $reason String Reason for protection
2253          * @param $expiry String Expiry timestamp
2254          * @return boolean true
2255          */
2256         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2257                 wfDeprecated( __METHOD__, '1.19' );
2258
2259                 global $wgUser;
2260
2261                 $limit = array( 'create' => $create_perm );
2262                 $expiry = array( 'create' => $expiry );
2263
2264                 $page = WikiPage::factory( $this );
2265                 $status = $page->doUpdateRestrictions( $limit, $expiry, false, $reason, $wgUser );
2266
2267                 return $status->isOK();
2268         }
2269
2270         /**
2271          * Remove any title protection due to page existing
2272          */
2273         public function deleteTitleProtection() {
2274                 $dbw = wfGetDB( DB_MASTER );
2275
2276                 $dbw->delete(
2277                         'protected_titles',
2278                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2279                         __METHOD__
2280                 );
2281                 $this->mTitleProtection = false;
2282         }
2283
2284         /**
2285          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2286          *
2287          * @param $action String Action to check (default: edit)
2288          * @return Bool
2289          */
2290         public function isSemiProtected( $action = 'edit' ) {
2291                 if ( $this->exists() ) {
2292                         $restrictions = $this->getRestrictions( $action );
2293                         if ( count( $restrictions ) > 0 ) {
2294                                 foreach ( $restrictions as $restriction ) {
2295                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2296                                                 return false;
2297                                         }
2298                                 }
2299                         } else {
2300                                 # Not protected
2301                                 return false;
2302                         }
2303                         return true;
2304                 } else {
2305                         # If it doesn't exist, it can't be protected
2306                         return false;
2307                 }
2308         }
2309
2310         /**
2311          * Does the title correspond to a protected article?
2312          *
2313          * @param $action String the action the page is protected from,
2314          * by default checks all actions.
2315          * @return Bool
2316          */
2317         public function isProtected( $action = '' ) {
2318                 global $wgRestrictionLevels;
2319
2320                 $restrictionTypes = $this->getRestrictionTypes();
2321
2322                 # Special pages have inherent protection
2323                 if( $this->isSpecialPage() ) {
2324                         return true;
2325                 }
2326
2327                 # Check regular protection levels
2328                 foreach ( $restrictionTypes as $type ) {
2329                         if ( $action == $type || $action == '' ) {
2330                                 $r = $this->getRestrictions( $type );
2331                                 foreach ( $wgRestrictionLevels as $level ) {
2332                                         if ( in_array( $level, $r ) && $level != '' ) {
2333                                                 return true;
2334                                         }
2335                                 }
2336                         }
2337                 }
2338
2339                 return false;
2340         }
2341
2342         /**
2343          * Determines if $user is unable to edit this page because it has been protected
2344          * by $wgNamespaceProtection.
2345          *
2346          * @param $user User object to check permissions
2347          * @return Bool
2348          */
2349         public function isNamespaceProtected( User $user ) {
2350                 global $wgNamespaceProtection;
2351
2352                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2353                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2354                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2355                                         return true;
2356                                 }
2357                         }
2358                 }
2359                 return false;
2360         }
2361
2362         /**
2363          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2364          *
2365          * @return Bool If the page is subject to cascading restrictions.
2366          */
2367         public function isCascadeProtected() {
2368                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2369                 return ( $sources > 0 );
2370         }
2371
2372         /**
2373          * Cascading protection: Get the source of any cascading restrictions on this page.
2374          *
2375          * @param $getPages Bool Whether or not to retrieve the actual pages
2376          *        that the restrictions have come from.
2377          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2378          *     have come, false for none, or true if such restrictions exist, but $getPages
2379          *     was not set.  The restriction array is an array of each type, each of which
2380          *     contains a array of unique groups.
2381          */
2382         public function getCascadeProtectionSources( $getPages = true ) {
2383                 global $wgContLang;
2384                 $pagerestrictions = array();
2385
2386                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2387                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2388                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2389                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2390                 }
2391
2392                 wfProfileIn( __METHOD__ );
2393
2394                 $dbr = wfGetDB( DB_SLAVE );
2395
2396                 if ( $this->getNamespace() == NS_FILE ) {
2397                         $tables = array( 'imagelinks', 'page_restrictions' );
2398                         $where_clauses = array(
2399                                 'il_to' => $this->getDBkey(),
2400                                 'il_from=pr_page',
2401                                 'pr_cascade' => 1
2402                         );
2403                 } else {
2404                         $tables = array( 'templatelinks', 'page_restrictions' );
2405                         $where_clauses = array(
2406                                 'tl_namespace' => $this->getNamespace(),
2407                                 'tl_title' => $this->getDBkey(),
2408                                 'tl_from=pr_page',
2409                                 'pr_cascade' => 1
2410                         );
2411                 }
2412
2413                 if ( $getPages ) {
2414                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2415                                                    'pr_expiry', 'pr_type', 'pr_level' );
2416                         $where_clauses[] = 'page_id=pr_page';
2417                         $tables[] = 'page';
2418                 } else {
2419                         $cols = array( 'pr_expiry' );
2420                 }
2421
2422                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2423
2424                 $sources = $getPages ? array() : false;
2425                 $now = wfTimestampNow();
2426                 $purgeExpired = false;
2427
2428                 foreach ( $res as $row ) {
2429                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2430                         if ( $expiry > $now ) {
2431                                 if ( $getPages ) {
2432                                         $page_id = $row->pr_page;
2433                                         $page_ns = $row->page_namespace;
2434                                         $page_title = $row->page_title;
2435                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2436                                         # Add groups needed for each restriction type if its not already there
2437                                         # Make sure this restriction type still exists
2438
2439                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2440                                                 $pagerestrictions[$row->pr_type] = array();
2441                                         }
2442
2443                                         if ( isset( $pagerestrictions[$row->pr_type] ) &&
2444                                                  !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] ) ) {
2445                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2446                                         }
2447                                 } else {
2448                                         $sources = true;
2449                                 }
2450                         } else {
2451                                 // Trigger lazy purge of expired restrictions from the db
2452                                 $purgeExpired = true;
2453                         }
2454                 }
2455                 if ( $purgeExpired ) {
2456                         Title::purgeExpiredRestrictions();
2457                 }
2458
2459                 if ( $getPages ) {
2460                         $this->mCascadeSources = $sources;
2461                         $this->mCascadingRestrictions = $pagerestrictions;
2462                 } else {
2463                         $this->mHasCascadingRestrictions = $sources;
2464                 }
2465
2466                 wfProfileOut( __METHOD__ );
2467                 return array( $sources, $pagerestrictions );
2468         }
2469
2470         /**
2471          * Accessor/initialisation for mRestrictions
2472          *
2473          * @param $action String action that permission needs to be checked for
2474          * @return Array of Strings the array of groups allowed to edit this article
2475          */
2476         public function getRestrictions( $action ) {
2477                 if ( !$this->mRestrictionsLoaded ) {
2478                         $this->loadRestrictions();
2479                 }
2480                 return isset( $this->mRestrictions[$action] )
2481                                 ? $this->mRestrictions[$action]
2482                                 : array();
2483         }
2484
2485         /**
2486          * Get the expiry time for the restriction against a given action
2487          *
2488          * @param $action
2489          * @return String|Bool 14-char timestamp, or 'infinity' if the page is protected forever
2490          *     or not protected at all, or false if the action is not recognised.
2491          */
2492         public function getRestrictionExpiry( $action ) {
2493                 if ( !$this->mRestrictionsLoaded ) {
2494                         $this->loadRestrictions();
2495                 }
2496                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2497         }
2498
2499         /**
2500          * Returns cascading restrictions for the current article
2501          *
2502          * @return Boolean
2503          */
2504         function areRestrictionsCascading() {
2505                 if ( !$this->mRestrictionsLoaded ) {
2506                         $this->loadRestrictions();
2507                 }
2508
2509                 return $this->mCascadeRestriction;
2510         }
2511
2512         /**
2513          * Loads a string into mRestrictions array
2514          *
2515          * @param $res Resource restrictions as an SQL result.
2516          * @param $oldFashionedRestrictions String comma-separated list of page
2517          *        restrictions from page table (pre 1.10)
2518          */
2519         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
2520                 $rows = array();
2521
2522                 foreach ( $res as $row ) {
2523                         $rows[] = $row;
2524                 }
2525
2526                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
2527         }
2528
2529         /**
2530          * Compiles list of active page restrictions from both page table (pre 1.10)
2531          * and page_restrictions table for this existing page.
2532          * Public for usage by LiquidThreads.
2533          *
2534          * @param $rows array of db result objects
2535          * @param $oldFashionedRestrictions string comma-separated list of page
2536          *        restrictions from page table (pre 1.10)
2537          */
2538         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
2539                 global $wgContLang;
2540                 $dbr = wfGetDB( DB_SLAVE );
2541
2542                 $restrictionTypes = $this->getRestrictionTypes();
2543
2544                 foreach ( $restrictionTypes as $type ) {
2545                         $this->mRestrictions[$type] = array();
2546                         $this->mRestrictionsExpiry[$type] = $wgContLang->formatExpiry( '', TS_MW );
2547                 }
2548
2549                 $this->mCascadeRestriction = false;
2550
2551                 # Backwards-compatibility: also load the restrictions from the page record (old format).
2552
2553                 if ( $oldFashionedRestrictions === null ) {
2554                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
2555                                 array( 'page_id' => $this->getArticleID() ), __METHOD__ );
2556                 }
2557
2558                 if ( $oldFashionedRestrictions != '' ) {
2559
2560                         foreach ( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
2561                                 $temp = explode( '=', trim( $restrict ) );
2562                                 if ( count( $temp ) == 1 ) {
2563                                         // old old format should be treated as edit/move restriction
2564                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
2565                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
2566                                 } else {
2567                                         $restriction = trim( $temp[1] );
2568                                         if( $restriction != '' ) { //some old entries are empty
2569                                                 $this->mRestrictions[$temp[0]] = explode( ',', $restriction );
2570                                         }
2571                                 }
2572                         }
2573
2574                         $this->mOldRestrictions = true;
2575
2576                 }
2577
2578                 if ( count( $rows ) ) {
2579                         # Current system - load second to make them override.
2580                         $now = wfTimestampNow();
2581                         $purgeExpired = false;
2582
2583                         # Cycle through all the restrictions.
2584                         foreach ( $rows as $row ) {
2585
2586                                 // Don't take care of restrictions types that aren't allowed
2587                                 if ( !in_array( $row->pr_type, $restrictionTypes ) )
2588                                         continue;
2589
2590                                 // This code should be refactored, now that it's being used more generally,
2591                                 // But I don't really see any harm in leaving it in Block for now -werdna
2592                                 $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2593
2594                                 // Only apply the restrictions if they haven't expired!
2595                                 if ( !$expiry || $expiry > $now ) {
2596                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
2597                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
2598
2599                                         $this->mCascadeRestriction |= $row->pr_cascade;
2600                                 } else {
2601                                         // Trigger a lazy purge of expired restrictions
2602                                         $purgeExpired = true;
2603                                 }
2604                         }
2605
2606                         if ( $purgeExpired ) {
2607                                 Title::purgeExpiredRestrictions();
2608                         }
2609                 }
2610
2611                 $this->mRestrictionsLoaded = true;
2612         }
2613
2614         /**
2615          * Load restrictions from the page_restrictions table
2616          *
2617          * @param $oldFashionedRestrictions String comma-separated list of page
2618          *        restrictions from page table (pre 1.10)
2619          */
2620         public function loadRestrictions( $oldFashionedRestrictions = null ) {
2621                 global $wgContLang;
2622                 if ( !$this->mRestrictionsLoaded ) {
2623                         if ( $this->exists() ) {
2624                                 $dbr = wfGetDB( DB_SLAVE );
2625
2626                                 $res = $dbr->select(
2627                                         'page_restrictions',
2628                                         '*',
2629                                         array( 'pr_page' => $this->getArticleID() ),
2630                                         __METHOD__
2631                                 );
2632
2633                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2634                         } else {
2635                                 $title_protection = $this->getTitleProtection();
2636
2637                                 if ( $title_protection ) {
2638                                         $now = wfTimestampNow();
2639                                         $expiry = $wgContLang->formatExpiry( $title_protection['pt_expiry'], TS_MW );
2640
2641                                         if ( !$expiry || $expiry > $now ) {
2642                                                 // Apply the restrictions
2643                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2644                                                 $this->mRestrictions['create'] = explode( ',', trim( $title_protection['pt_create_perm'] ) );
2645                                         } else { // Get rid of the old restrictions
2646                                                 Title::purgeExpiredRestrictions();
2647                                                 $this->mTitleProtection = false;
2648                                         }
2649                                 } else {
2650                                         $this->mRestrictionsExpiry['create'] = $wgContLang->formatExpiry( '', TS_MW );
2651                                 }
2652                                 $this->mRestrictionsLoaded = true;
2653                         }
2654                 }
2655         }
2656
2657         /**
2658          * Flush the protection cache in this object and force reload from the database.
2659          * This is used when updating protection from WikiPage::doUpdateRestrictions().
2660          */
2661         public function flushRestrictions() {
2662                 $this->mRestrictionsLoaded = false;
2663                 $this->mTitleProtection = null;
2664         }
2665
2666         /**
2667          * Purge expired restrictions from the page_restrictions table
2668          */
2669         static function purgeExpiredRestrictions() {
2670                 $dbw = wfGetDB( DB_MASTER );
2671                 $dbw->delete(
2672                         'page_restrictions',
2673                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2674                         __METHOD__
2675                 );
2676
2677                 $dbw->delete(
2678                         'protected_titles',
2679                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2680                         __METHOD__
2681                 );
2682         }
2683
2684         /**
2685          * Does this have subpages?  (Warning, usually requires an extra DB query.)
2686          *
2687          * @return Bool
2688          */
2689         public function hasSubpages() {
2690                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
2691                         # Duh
2692                         return false;
2693                 }
2694
2695                 # We dynamically add a member variable for the purpose of this method
2696                 # alone to cache the result.  There's no point in having it hanging
2697                 # around uninitialized in every Title object; therefore we only add it
2698                 # if needed and don't declare it statically.
2699                 if ( isset( $this->mHasSubpages ) ) {
2700                         return $this->mHasSubpages;
2701                 }
2702
2703                 $subpages = $this->getSubpages( 1 );
2704                 if ( $subpages instanceof TitleArray ) {
2705                         return $this->mHasSubpages = (bool)$subpages->count();
2706                 }
2707                 return $this->mHasSubpages = false;
2708         }
2709
2710         /**
2711          * Get all subpages of this page.
2712          *
2713          * @param $limit Int maximum number of subpages to fetch; -1 for no limit
2714          * @return mixed TitleArray, or empty array if this page's namespace
2715          *  doesn't allow subpages
2716          */
2717         public function getSubpages( $limit = -1 ) {
2718                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
2719                         return array();
2720                 }
2721
2722                 $dbr = wfGetDB( DB_SLAVE );
2723                 $conds['page_namespace'] = $this->getNamespace();
2724                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
2725                 $options = array();
2726                 if ( $limit > -1 ) {
2727                         $options['LIMIT'] = $limit;
2728                 }
2729                 return $this->mSubpages = TitleArray::newFromResult(
2730                         $dbr->select( 'page',
2731                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
2732                                 $conds,
2733                                 __METHOD__,
2734                                 $options
2735                         )
2736                 );
2737         }
2738
2739         /**
2740          * Is there a version of this page in the deletion archive?
2741          *
2742          * @return Int the number of archived revisions
2743          */
2744         public function isDeleted() {
2745                 if ( $this->getNamespace() < 0 ) {
2746                         $n = 0;
2747                 } else {
2748                         $dbr = wfGetDB( DB_SLAVE );
2749
2750                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2751                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2752                                 __METHOD__
2753                         );
2754                         if ( $this->getNamespace() == NS_FILE ) {
2755                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2756                                         array( 'fa_name' => $this->getDBkey() ),
2757                                         __METHOD__
2758                                 );
2759                         }
2760                 }
2761                 return (int)$n;
2762         }
2763
2764         /**
2765          * Is there a version of this page in the deletion archive?
2766          *
2767          * @return Boolean
2768          */
2769         public function isDeletedQuick() {
2770                 if ( $this->getNamespace() < 0 ) {
2771                         return false;
2772                 }
2773                 $dbr = wfGetDB( DB_SLAVE );
2774                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2775                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2776                         __METHOD__
2777                 );
2778                 if ( !$deleted && $this->getNamespace() == NS_FILE ) {
2779                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2780                                 array( 'fa_name' => $this->getDBkey() ),
2781                                 __METHOD__
2782                         );
2783                 }
2784                 return $deleted;
2785         }
2786
2787         /**
2788          * Get the article ID for this Title from the link cache,
2789          * adding it if necessary
2790          *
2791          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select
2792          *  for update
2793          * @return Int the ID
2794          */
2795         public function getArticleID( $flags = 0 ) {
2796                 if ( $this->getNamespace() < 0 ) {
2797                         return $this->mArticleID = 0;
2798                 }
2799                 $linkCache = LinkCache::singleton();
2800                 if ( $flags & self::GAID_FOR_UPDATE ) {
2801                         $oldUpdate = $linkCache->forUpdate( true );
2802                         $linkCache->clearLink( $this );
2803                         $this->mArticleID = $linkCache->addLinkObj( $this );
2804                         $linkCache->forUpdate( $oldUpdate );
2805                 } else {
2806                         if ( -1 == $this->mArticleID ) {
2807                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2808                         }
2809                 }
2810                 return $this->mArticleID;
2811         }
2812
2813         /**
2814          * Is this an article that is a redirect page?
2815          * Uses link cache, adding it if necessary
2816          *
2817          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2818          * @return Bool
2819          */
2820         public function isRedirect( $flags = 0 ) {
2821                 if ( !is_null( $this->mRedirect ) ) {
2822                         return $this->mRedirect;
2823                 }
2824                 # Calling getArticleID() loads the field from cache as needed
2825                 if ( !$this->getArticleID( $flags ) ) {
2826                         return $this->mRedirect = false;
2827                 }
2828                 $linkCache = LinkCache::singleton();
2829                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2830
2831                 return $this->mRedirect;
2832         }
2833
2834         /**
2835          * What is the length of this page?
2836          * Uses link cache, adding it if necessary
2837          *
2838          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2839          * @return Int
2840          */
2841         public function getLength( $flags = 0 ) {
2842                 if ( $this->mLength != -1 ) {
2843                         return $this->mLength;
2844                 }
2845                 # Calling getArticleID() loads the field from cache as needed
2846                 if ( !$this->getArticleID( $flags ) ) {
2847                         return $this->mLength = 0;
2848                 }
2849                 $linkCache = LinkCache::singleton();
2850                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2851
2852                 return $this->mLength;
2853         }
2854
2855         /**
2856          * What is the page_latest field for this page?
2857          *
2858          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2859          * @return Int or 0 if the page doesn't exist
2860          */
2861         public function getLatestRevID( $flags = 0 ) {
2862                 if ( !( $flags & Title::GAID_FOR_UPDATE ) && $this->mLatestID !== false ) {
2863                         return intval( $this->mLatestID );
2864                 }
2865                 # Calling getArticleID() loads the field from cache as needed
2866                 if ( !$this->getArticleID( $flags ) ) {
2867                         return $this->mLatestID = 0;
2868                 }
2869                 $linkCache = LinkCache::singleton();
2870                 $this->mLatestID = intval( $linkCache->getGoodLinkFieldObj( $this, 'revision' ) );
2871
2872                 return $this->mLatestID;
2873         }
2874
2875         /**
2876          * This clears some fields in this object, and clears any associated
2877          * keys in the "bad links" section of the link cache.
2878          *
2879          * - This is called from WikiPage::doEdit() and WikiPage::insertOn() to allow
2880          * loading of the new page_id. It's also called from
2881          * WikiPage::doDeleteArticleReal()
2882          *
2883          * @param $newid Int the new Article ID
2884          */
2885         public function resetArticleID( $newid ) {
2886                 $linkCache = LinkCache::singleton();
2887                 $linkCache->clearLink( $this );
2888
2889                 if ( $newid === false ) {
2890                         $this->mArticleID = -1;
2891                 } else {
2892                         $this->mArticleID = intval( $newid );
2893                 }
2894                 $this->mRestrictionsLoaded = false;
2895                 $this->mRestrictions = array();
2896                 $this->mRedirect = null;
2897                 $this->mLength = -1;
2898                 $this->mLatestID = false;
2899                 $this->mEstimateRevisions = null;
2900         }
2901
2902         /**
2903          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
2904          *
2905          * @param $text String containing title to capitalize
2906          * @param $ns int namespace index, defaults to NS_MAIN
2907          * @return String containing capitalized title
2908          */
2909         public static function capitalize( $text, $ns = NS_MAIN ) {
2910                 global $wgContLang;
2911
2912                 if ( MWNamespace::isCapitalized( $ns ) ) {
2913                         return $wgContLang->ucfirst( $text );
2914                 } else {
2915                         return $text;
2916                 }
2917         }
2918
2919         /**
2920          * Secure and split - main initialisation function for this object
2921          *
2922          * Assumes that mDbkeyform has been set, and is urldecoded
2923          * and uses underscores, but not otherwise munged.  This function
2924          * removes illegal characters, splits off the interwiki and
2925          * namespace prefixes, sets the other forms, and canonicalizes
2926          * everything.
2927          *
2928          * @return Bool true on success
2929          */
2930         private function secureAndSplit() {
2931                 global $wgContLang, $wgLocalInterwiki;
2932
2933                 # Initialisation
2934                 $this->mInterwiki = $this->mFragment = '';
2935                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2936
2937                 $dbkey = $this->mDbkeyform;
2938
2939                 # Strip Unicode bidi override characters.
2940                 # Sometimes they slip into cut-n-pasted page titles, where the
2941                 # override chars get included in list displays.
2942                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2943
2944                 # Clean up whitespace
2945                 # Note: use of the /u option on preg_replace here will cause
2946                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2947                 # conveniently disabling them.
2948                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2949                 $dbkey = trim( $dbkey, '_' );
2950
2951                 if ( $dbkey == '' ) {
2952                         return false;
2953                 }
2954
2955                 if ( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2956                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2957                         return false;
2958                 }
2959
2960                 $this->mDbkeyform = $dbkey;
2961
2962                 # Initial colon indicates main namespace rather than specified default
2963                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2964                 if ( ':' == $dbkey[0] ) {
2965                         $this->mNamespace = NS_MAIN;
2966                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2967                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2968                 }
2969
2970                 # Namespace or interwiki prefix
2971                 $firstPass = true;
2972                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2973                 do {
2974                         $m = array();
2975                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2976                                 $p = $m[1];
2977                                 if ( ( $ns = $wgContLang->getNsIndex( $p ) ) !== false ) {
2978                                         # Ordinary namespace
2979                                         $dbkey = $m[2];
2980                                         $this->mNamespace = $ns;
2981                                         # For Talk:X pages, check if X has a "namespace" prefix
2982                                         if ( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2983                                                 if ( $wgContLang->getNsIndex( $x[1] ) ) {
2984                                                         # Disallow Talk:File:x type titles...
2985                                                         return false;
2986                                                 } elseif ( Interwiki::isValidInterwiki( $x[1] ) ) {
2987                                                         # Disallow Talk:Interwiki:x type titles...
2988                                                         return false;
2989                                                 }
2990                                         }
2991                                 } elseif ( Interwiki::isValidInterwiki( $p ) ) {
2992                                         if ( !$firstPass ) {
2993                                                 # Can't make a local interwiki link to an interwiki link.
2994                                                 # That's just crazy!
2995                                                 return false;
2996                                         }
2997
2998                                         # Interwiki link
2999                                         $dbkey = $m[2];
3000                                         $this->mInterwiki = $wgContLang->lc( $p );
3001
3002                                         # Redundant interwiki prefix to the local wiki
3003                                         if ( $wgLocalInterwiki !== false
3004                                                 && 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) )
3005                                         {
3006                                                 if ( $dbkey == '' ) {
3007                                                         # Can't have an empty self-link
3008                                                         return false;
3009                                                 }
3010                                                 $this->mInterwiki = '';
3011                                                 $firstPass = false;
3012                                                 # Do another namespace split...
3013                                                 continue;
3014                                         }
3015
3016                                         # If there's an initial colon after the interwiki, that also
3017                                         # resets the default namespace
3018                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
3019                                                 $this->mNamespace = NS_MAIN;
3020                                                 $dbkey = substr( $dbkey, 1 );
3021                                         }
3022                                 }
3023                                 # If there's no recognized interwiki or namespace,
3024                                 # then let the colon expression be part of the title.
3025                         }
3026                         break;
3027                 } while ( true );
3028
3029                 # We already know that some pages won't be in the database!
3030                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
3031                         $this->mArticleID = 0;
3032                 }
3033                 $fragment = strstr( $dbkey, '#' );
3034                 if ( false !== $fragment ) {
3035                         $this->setFragment( $fragment );
3036                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
3037                         # remove whitespace again: prevents "Foo_bar_#"
3038                         # becoming "Foo_bar_"
3039                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
3040                 }
3041
3042                 # Reject illegal characters.
3043                 $rxTc = self::getTitleInvalidRegex();
3044                 if ( preg_match( $rxTc, $dbkey ) ) {
3045                         return false;
3046                 }
3047
3048                 # Pages with "/./" or "/../" appearing in the URLs will often be un-
3049                 # reachable due to the way web browsers deal with 'relative' URLs.
3050                 # Also, they conflict with subpage syntax.  Forbid them explicitly.
3051                 if ( strpos( $dbkey, '.' ) !== false &&
3052                          ( $dbkey === '.' || $dbkey === '..' ||
3053                            strpos( $dbkey, './' ) === 0  ||
3054                            strpos( $dbkey, '../' ) === 0 ||
3055                            strpos( $dbkey, '/./' ) !== false ||
3056                            strpos( $dbkey, '/../' ) !== false  ||
3057                            substr( $dbkey, -2 ) == '/.' ||
3058                            substr( $dbkey, -3 ) == '/..' ) )
3059                 {
3060                         return false;
3061                 }
3062
3063                 # Magic tilde sequences? Nu-uh!
3064                 if ( strpos( $dbkey, '~~~' ) !== false ) {
3065                         return false;
3066                 }
3067
3068                 # Limit the size of titles to 255 bytes. This is typically the size of the
3069                 # underlying database field. We make an exception for special pages, which
3070                 # don't need to be stored in the database, and may edge over 255 bytes due
3071                 # to subpage syntax for long titles, e.g. [[Special:Block/Long name]]
3072                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
3073                   strlen( $dbkey ) > 512 )
3074                 {
3075                         return false;
3076                 }
3077
3078                 # Normally, all wiki links are forced to have an initial capital letter so [[foo]]
3079                 # and [[Foo]] point to the same place.  Don't force it for interwikis, since the
3080                 # other site might be case-sensitive.
3081                 $this->mUserCaseDBKey = $dbkey;
3082                 if ( $this->mInterwiki == '' ) {
3083                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
3084                 }
3085
3086                 # Can't make a link to a namespace alone... "empty" local links can only be
3087                 # self-links with a fragment identifier.
3088                 if ( $dbkey == '' && $this->mInterwiki == '' && $this->mNamespace != NS_MAIN ) {
3089                         return false;
3090                 }
3091
3092                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
3093                 // IP names are not allowed for accounts, and can only be referring to
3094                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
3095                 // there are numerous ways to present the same IP. Having sp:contribs scan
3096                 // them all is silly and having some show the edits and others not is
3097                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
3098                 $dbkey = ( $this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK )
3099                         ? IP::sanitizeIP( $dbkey )
3100                         : $dbkey;
3101
3102                 // Any remaining initial :s are illegal.
3103                 if ( $dbkey !== '' && ':' == $dbkey[0] ) {
3104                         return false;
3105                 }
3106
3107                 # Fill fields
3108                 $this->mDbkeyform = $dbkey;
3109                 $this->mUrlform = wfUrlencode( $dbkey );
3110
3111                 $this->mTextform = str_replace( '_', ' ', $dbkey );
3112
3113                 return true;
3114         }
3115
3116         /**
3117          * Get an array of Title objects linking to this Title
3118          * Also stores the IDs in the link cache.
3119          *
3120          * WARNING: do not use this function on arbitrary user-supplied titles!
3121          * On heavily-used templates it will max out the memory.
3122          *
3123          * @param $options Array: may be FOR UPDATE
3124          * @param $table String: table name
3125          * @param $prefix String: fields prefix
3126          * @return Array of Title objects linking here
3127          */
3128         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3129                 if ( count( $options ) > 0 ) {
3130                         $db = wfGetDB( DB_MASTER );
3131                 } else {
3132                         $db = wfGetDB( DB_SLAVE );
3133                 }
3134
3135                 $res = $db->select(
3136                         array( 'page', $table ),
3137                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3138                         array(
3139                                 "{$prefix}_from=page_id",
3140                                 "{$prefix}_namespace" => $this->getNamespace(),
3141                                 "{$prefix}_title"     => $this->getDBkey() ),
3142                         __METHOD__,
3143                         $options
3144                 );
3145
3146                 $retVal = array();
3147                 if ( $res->numRows() ) {
3148                         $linkCache = LinkCache::singleton();
3149                         foreach ( $res as $row ) {
3150                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
3151                                 if ( $titleObj ) {
3152                                         $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3153                                         $retVal[] = $titleObj;
3154                                 }
3155                         }
3156                 }
3157                 return $retVal;
3158         }
3159
3160         /**
3161          * Get an array of Title objects using this Title as a template
3162          * Also stores the IDs in the link cache.
3163          *
3164          * WARNING: do not use this function on arbitrary user-supplied titles!
3165          * On heavily-used templates it will max out the memory.
3166          *
3167          * @param $options Array: may be FOR UPDATE
3168          * @return Array of Title the Title objects linking here
3169          */
3170         public function getTemplateLinksTo( $options = array() ) {
3171                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
3172         }
3173
3174         /**
3175          * Get an array of Title objects linked from this Title
3176          * Also stores the IDs in the link cache.
3177          *
3178          * WARNING: do not use this function on arbitrary user-supplied titles!
3179          * On heavily-used templates it will max out the memory.
3180          *
3181          * @param $options Array: may be FOR UPDATE
3182          * @param $table String: table name
3183          * @param $prefix String: fields prefix
3184          * @return Array of Title objects linking here
3185          */
3186         public function getLinksFrom( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3187                 $id = $this->getArticleID();
3188
3189                 # If the page doesn't exist; there can't be any link from this page
3190                 if ( !$id ) {
3191                         return array();
3192                 }
3193
3194                 if ( count( $options ) > 0 ) {
3195                         $db = wfGetDB( DB_MASTER );
3196                 } else {
3197                         $db = wfGetDB( DB_SLAVE );
3198                 }
3199
3200                 $namespaceFiled = "{$prefix}_namespace";
3201                 $titleField = "{$prefix}_title";
3202
3203                 $res = $db->select(
3204                         array( $table, 'page' ),
3205                         array( $namespaceFiled, $titleField, 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3206                         array( "{$prefix}_from" => $id ),
3207                         __METHOD__,
3208                         $options,
3209                         array( 'page' => array( 'LEFT JOIN', array( "page_namespace=$namespaceFiled", "page_title=$titleField" ) ) )
3210                 );
3211
3212                 $retVal = array();
3213                 if ( $res->numRows() ) {
3214                         $linkCache = LinkCache::singleton();
3215                         foreach ( $res as $row ) {
3216                                 $titleObj = Title::makeTitle( $row->$namespaceFiled, $row->$titleField );
3217                                 if ( $titleObj ) {
3218                                         if ( $row->page_id ) {
3219                                                 $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3220                                         } else {
3221                                                 $linkCache->addBadLinkObj( $titleObj );
3222                                         }
3223                                         $retVal[] = $titleObj;
3224                                 }
3225                         }
3226                 }
3227                 return $retVal;
3228         }
3229
3230         /**
3231          * Get an array of Title objects used on this Title as a template
3232          * Also stores the IDs in the link cache.
3233          *
3234          * WARNING: do not use this function on arbitrary user-supplied titles!
3235          * On heavily-used templates it will max out the memory.
3236          *
3237          * @param $options Array: may be FOR UPDATE
3238          * @return Array of Title the Title objects used here
3239          */
3240         public function getTemplateLinksFrom( $options = array() ) {
3241                 return $this->getLinksFrom( $options, 'templatelinks', 'tl' );
3242         }
3243
3244         /**
3245          * Get an array of Title objects referring to non-existent articles linked from this page
3246          *
3247          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
3248          * @return Array of Title the Title objects
3249          */
3250         public function getBrokenLinksFrom() {
3251                 if ( $this->getArticleID() == 0 ) {
3252                         # All links from article ID 0 are false positives
3253                         return array();
3254                 }
3255
3256                 $dbr = wfGetDB( DB_SLAVE );
3257                 $res = $dbr->select(
3258                         array( 'page', 'pagelinks' ),
3259                         array( 'pl_namespace', 'pl_title' ),
3260                         array(
3261                                 'pl_from' => $this->getArticleID(),
3262                                 'page_namespace IS NULL'
3263                         ),
3264                         __METHOD__, array(),
3265                         array(
3266                                 'page' => array(
3267                                         'LEFT JOIN',
3268                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
3269                                 )
3270                         )
3271                 );
3272
3273                 $retVal = array();
3274                 foreach ( $res as $row ) {
3275                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
3276                 }
3277                 return $retVal;
3278         }
3279
3280
3281         /**
3282          * Get a list of URLs to purge from the Squid cache when this
3283          * page changes
3284          *
3285          * @return Array of String the URLs
3286          */
3287         public function getSquidURLs() {
3288                 $urls = array(
3289                         $this->getInternalURL(),
3290                         $this->getInternalURL( 'action=history' )
3291                 );
3292
3293                 $pageLang = $this->getPageLanguage();
3294                 if ( $pageLang->hasVariants() ) {
3295                         $variants = $pageLang->getVariants();
3296                         foreach ( $variants as $vCode ) {
3297                                 $urls[] = $this->getInternalURL( '', $vCode );
3298                         }
3299                 }
3300
3301                 return $urls;
3302         }
3303
3304         /**
3305          * Purge all applicable Squid URLs
3306          */
3307         public function purgeSquid() {
3308                 global $wgUseSquid;
3309                 if ( $wgUseSquid ) {
3310                         $urls = $this->getSquidURLs();
3311                         $u = new SquidUpdate( $urls );
3312                         $u->doUpdate();
3313                 }
3314         }
3315
3316         /**
3317          * Move this page without authentication
3318          *
3319          * @param $nt Title the new page Title
3320          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3321          */
3322         public function moveNoAuth( &$nt ) {
3323                 return $this->moveTo( $nt, false );
3324         }
3325
3326         /**
3327          * Check whether a given move operation would be valid.
3328          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
3329          *
3330          * @param $nt Title the new title
3331          * @param $auth Bool indicates whether $wgUser's permissions
3332          *  should be checked
3333          * @param $reason String is the log summary of the move, used for spam checking
3334          * @return Mixed True on success, getUserPermissionsErrors()-like array on failure
3335          */
3336         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
3337                 global $wgUser;
3338
3339                 $errors = array();
3340                 if ( !$nt ) {
3341                         // Normally we'd add this to $errors, but we'll get
3342                         // lots of syntax errors if $nt is not an object
3343                         return array( array( 'badtitletext' ) );
3344                 }
3345                 if ( $this->equals( $nt ) ) {
3346                         $errors[] = array( 'selfmove' );
3347                 }
3348                 if ( !$this->isMovable() ) {
3349                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
3350                 }
3351                 if ( $nt->getInterwiki() != '' ) {
3352                         $errors[] = array( 'immobile-target-namespace-iw' );
3353                 }
3354                 if ( !$nt->isMovable() ) {
3355                         $errors[] = array( 'immobile-target-namespace', $nt->getNsText() );
3356                 }
3357
3358                 $oldid = $this->getArticleID();
3359                 $newid = $nt->getArticleID();
3360
3361                 if ( strlen( $nt->getDBkey() ) < 1 ) {
3362                         $errors[] = array( 'articleexists' );
3363                 }
3364                 if ( ( $this->getDBkey() == '' ) ||
3365                          ( !$oldid ) ||
3366                          ( $nt->getDBkey() == '' ) ) {
3367                         $errors[] = array( 'badarticleerror' );
3368                 }
3369
3370                 // Image-specific checks
3371                 if ( $this->getNamespace() == NS_FILE ) {
3372                         $errors = array_merge( $errors, $this->validateFileMoveOperation( $nt ) );
3373                 }
3374
3375                 if ( $nt->getNamespace() == NS_FILE && $this->getNamespace() != NS_FILE ) {
3376                         $errors[] = array( 'nonfile-cannot-move-to-file' );
3377                 }
3378
3379                 if ( $auth ) {
3380                         $errors = wfMergeErrorArrays( $errors,
3381                                 $this->getUserPermissionsErrors( 'move', $wgUser ),
3382                                 $this->getUserPermissionsErrors( 'edit', $wgUser ),
3383                                 $nt->getUserPermissionsErrors( 'move-target', $wgUser ),
3384                                 $nt->getUserPermissionsErrors( 'edit', $wgUser ) );
3385                 }
3386
3387                 $match = EditPage::matchSummarySpamRegex( $reason );
3388                 if ( $match !== false ) {
3389                         // This is kind of lame, won't display nice
3390                         $errors[] = array( 'spamprotectiontext' );
3391                 }
3392
3393                 $err = null;
3394                 if ( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
3395                         $errors[] = array( 'hookaborted', $err );
3396                 }
3397
3398                 # The move is allowed only if (1) the target doesn't exist, or
3399                 # (2) the target is a redirect to the source, and has no history
3400                 # (so we can undo bad moves right after they're done).
3401
3402                 if ( 0 != $newid ) { # Target exists; check for validity
3403                         if ( !$this->isValidMoveTarget( $nt ) ) {
3404                                 $errors[] = array( 'articleexists' );
3405                         }
3406                 } else {
3407                         $tp = $nt->getTitleProtection();
3408                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
3409                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
3410                                 $errors[] = array( 'cantmove-titleprotected' );
3411                         }
3412                 }
3413                 if ( empty( $errors ) ) {
3414                         return true;
3415                 }
3416                 return $errors;
3417         }
3418
3419         /**
3420          * Check if the requested move target is a valid file move target
3421          * @param Title $nt Target title
3422          * @return array List of errors
3423          */
3424         protected function validateFileMoveOperation( $nt ) {
3425                 global $wgUser;
3426
3427                 $errors = array();
3428
3429                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is not allowed until below
3430
3431                 $file = wfLocalFile( $this );
3432                 if ( $file->exists() ) {
3433                         if ( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
3434                                 $errors[] = array( 'imageinvalidfilename' );
3435                         }
3436                         if ( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
3437                                 $errors[] = array( 'imagetypemismatch' );
3438                         }
3439                 }
3440
3441                 if ( $nt->getNamespace() != NS_FILE ) {
3442                         $errors[] = array( 'imagenocrossnamespace' );
3443                         // From here we want to do checks on a file object, so if we can't
3444                         // create one, we must return.
3445                         return $errors;
3446                 }
3447
3448                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is allowed below here
3449
3450                 $destFile = wfLocalFile( $nt );
3451                 if ( !$wgUser->isAllowed( 'reupload-shared' ) && !$destFile->exists() && wfFindFile( $nt ) ) {
3452                         $errors[] = array( 'file-exists-sharedrepo' );
3453                 }
3454
3455                 return $errors;
3456         }
3457
3458         /**
3459          * Move a title to a new location
3460          *
3461          * @param $nt Title the new title
3462          * @param $auth Bool indicates whether $wgUser's permissions
3463          *  should be checked
3464          * @param $reason String the reason for the move
3465          * @param $createRedirect Bool Whether to create a redirect from the old title to the new title.
3466          *  Ignored if the user doesn't have the suppressredirect right.
3467          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3468          */
3469         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
3470                 global $wgUser;
3471                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
3472                 if ( is_array( $err ) ) {
3473                         // Auto-block user's IP if the account was "hard" blocked
3474                         $wgUser->spreadAnyEditBlock();
3475                         return $err;
3476                 }
3477                 // Check suppressredirect permission
3478                 if ( $auth && !$wgUser->isAllowed( 'suppressredirect' ) ) {
3479                         $createRedirect = true;
3480                 }
3481
3482                 // If it is a file, move it first.
3483                 // It is done before all other moving stuff is done because it's hard to revert.
3484                 $dbw = wfGetDB( DB_MASTER );
3485                 if ( $this->getNamespace() == NS_FILE ) {
3486                         $file = wfLocalFile( $this );
3487                         if ( $file->exists() ) {
3488                                 $status = $file->move( $nt );
3489                                 if ( !$status->isOk() ) {
3490                                         return $status->getErrorsArray();
3491                                 }
3492                         }
3493                         // Clear RepoGroup process cache
3494                         RepoGroup::singleton()->clearCache( $this );
3495                         RepoGroup::singleton()->clearCache( $nt ); # clear false negative cache
3496                 }
3497
3498                 $dbw->begin( __METHOD__ ); # If $file was a LocalFile, its transaction would have closed our own.
3499                 $pageid = $this->getArticleID( self::GAID_FOR_UPDATE );
3500                 $protected = $this->isProtected();
3501
3502                 // Do the actual move
3503                 $this->moveToInternal( $nt, $reason, $createRedirect );
3504
3505                 // Refresh the sortkey for this row.  Be careful to avoid resetting
3506                 // cl_timestamp, which may disturb time-based lists on some sites.
3507                 $prefixes = $dbw->select(
3508                         'categorylinks',
3509                         array( 'cl_sortkey_prefix', 'cl_to' ),
3510                         array( 'cl_from' => $pageid ),
3511                         __METHOD__
3512                 );
3513                 foreach ( $prefixes as $prefixRow ) {
3514                         $prefix = $prefixRow->cl_sortkey_prefix;
3515                         $catTo = $prefixRow->cl_to;
3516                         $dbw->update( 'categorylinks',
3517                                 array(
3518                                         'cl_sortkey' => Collation::singleton()->getSortKey(
3519                                                 $nt->getCategorySortkey( $prefix ) ),
3520                                         'cl_timestamp=cl_timestamp' ),
3521                                 array(
3522                                         'cl_from' => $pageid,
3523                                         'cl_to' => $catTo ),
3524                                 __METHOD__
3525                         );
3526                 }
3527
3528                 $redirid = $this->getArticleID();
3529
3530                 if ( $protected ) {
3531                         # Protect the redirect title as the title used to be...
3532                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
3533                                 array(
3534                                         'pr_page'    => $redirid,
3535                                         'pr_type'    => 'pr_type',
3536                                         'pr_level'   => 'pr_level',
3537                                         'pr_cascade' => 'pr_cascade',
3538                                         'pr_user'    => 'pr_user',
3539                                         'pr_expiry'  => 'pr_expiry'
3540                                 ),
3541                                 array( 'pr_page' => $pageid ),
3542                                 __METHOD__,
3543                                 array( 'IGNORE' )
3544                         );
3545                         # Update the protection log
3546                         $log = new LogPage( 'protect' );
3547                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3548                         if ( $reason ) {
3549                                 $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3550                         }
3551                         // @todo FIXME: $params?
3552                         $log->addEntry( 'move_prot', $nt, $comment, array( $this->getPrefixedText() ) );
3553                 }
3554
3555                 # Update watchlists
3556                 $oldnamespace = $this->getNamespace() & ~1;
3557                 $newnamespace = $nt->getNamespace() & ~1;
3558                 $oldtitle = $this->getDBkey();
3559                 $newtitle = $nt->getDBkey();
3560
3561                 if ( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
3562                         WatchedItem::duplicateEntries( $this, $nt );
3563                 }
3564
3565                 $dbw->commit( __METHOD__ );
3566
3567                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
3568                 return true;
3569         }
3570
3571         /**
3572          * Move page to a title which is either a redirect to the
3573          * source page or nonexistent
3574          *
3575          * @param $nt Title the page to move to, which should be a redirect or nonexistent
3576          * @param $reason String The reason for the move
3577          * @param $createRedirect Bool Whether to leave a redirect at the old title. Does not check
3578          *   if the user has the suppressredirect right
3579          * @throws MWException
3580          */
3581         private function moveToInternal( &$nt, $reason = '', $createRedirect = true ) {
3582                 global $wgUser, $wgContLang;
3583
3584                 if ( $nt->exists() ) {
3585                         $moveOverRedirect = true;
3586                         $logType = 'move_redir';
3587                 } else {
3588                         $moveOverRedirect = false;
3589                         $logType = 'move';
3590                 }
3591
3592                 $redirectSuppressed = !$createRedirect;
3593
3594                 $logEntry = new ManualLogEntry( 'move', $logType );
3595                 $logEntry->setPerformer( $wgUser );
3596                 $logEntry->setTarget( $this );
3597                 $logEntry->setComment( $reason );
3598                 $logEntry->setParameters( array(
3599                         '4::target' => $nt->getPrefixedText(),
3600                         '5::noredir' => $redirectSuppressed ? '1': '0',
3601                 ) );
3602
3603                 $formatter = LogFormatter::newFromEntry( $logEntry );
3604                 $formatter->setContext( RequestContext::newExtraneousContext( $this ) );
3605                 $comment = $formatter->getPlainActionText();
3606                 if ( $reason ) {
3607                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3608                 }
3609                 # Truncate for whole multibyte characters.
3610                 $comment = $wgContLang->truncate( $comment, 255 );
3611
3612                 $oldid = $this->getArticleID();
3613
3614                 $dbw = wfGetDB( DB_MASTER );
3615
3616                 $newpage = WikiPage::factory( $nt );
3617
3618                 if ( $moveOverRedirect ) {
3619                         $newid = $nt->getArticleID();
3620
3621                         # Delete the old redirect. We don't save it to history since
3622                         # by definition if we've got here it's rather uninteresting.
3623                         # We have to remove it so that the next step doesn't trigger
3624                         # a conflict on the unique namespace+title index...
3625                         $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
3626
3627                         $newpage->doDeleteUpdates( $newid );
3628                 }
3629
3630                 # Save a null revision in the page's history notifying of the move
3631                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3632                 if ( !is_object( $nullRevision ) ) {
3633                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3634                 }
3635                 $nullRevId = $nullRevision->insertOn( $dbw );
3636
3637                 # Change the name of the target page:
3638                 $dbw->update( 'page',
3639                         /* SET */ array(
3640                                 'page_namespace' => $nt->getNamespace(),
3641                                 'page_title'     => $nt->getDBkey(),
3642                         ),
3643                         /* WHERE */ array( 'page_id' => $oldid ),
3644                         __METHOD__
3645                 );
3646
3647                 $this->resetArticleID( 0 );
3648                 $nt->resetArticleID( $oldid );
3649
3650                 $newpage->updateRevisionOn( $dbw, $nullRevision );
3651
3652                 wfRunHooks( 'NewRevisionFromEditComplete',
3653                         array( $newpage, $nullRevision, $nullRevision->getParentId(), $wgUser ) );
3654
3655                 $newpage->doEditUpdates( $nullRevision, $wgUser, array( 'changed' => false ) );
3656
3657                 if ( !$moveOverRedirect ) {
3658                         WikiPage::onArticleCreate( $nt );
3659                 }
3660
3661                 # Recreate the redirect, this time in the other direction.
3662                 if ( $redirectSuppressed ) {
3663                         WikiPage::onArticleDelete( $this );
3664                 } else {
3665                         $mwRedir = MagicWord::get( 'redirect' );
3666                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3667                         $redirectArticle = WikiPage::factory( $this );
3668                         $newid = $redirectArticle->insertOn( $dbw );
3669                         if ( $newid ) { // sanity
3670                                 $redirectRevision = new Revision( array(
3671                                         'page'    => $newid,
3672                                         'comment' => $comment,
3673                                         'text'    => $redirectText ) );
3674                                 $redirectRevision->insertOn( $dbw );
3675                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3676
3677                                 wfRunHooks( 'NewRevisionFromEditComplete',
3678                                         array( $redirectArticle, $redirectRevision, false, $wgUser ) );
3679
3680                                 $redirectArticle->doEditUpdates( $redirectRevision, $wgUser, array( 'created' => true ) );
3681                         }
3682                 }
3683
3684                 # Log the move
3685                 $logid = $logEntry->insert();
3686                 $logEntry->publish( $logid );
3687         }
3688
3689         /**
3690          * Move this page's subpages to be subpages of $nt
3691          *
3692          * @param $nt Title Move target
3693          * @param $auth bool Whether $wgUser's permissions should be checked
3694          * @param $reason string The reason for the move
3695          * @param $createRedirect bool Whether to create redirects from the old subpages to
3696          *     the new ones Ignored if the user doesn't have the 'suppressredirect' right
3697          * @return mixed array with old page titles as keys, and strings (new page titles) or
3698          *     arrays (errors) as values, or an error array with numeric indices if no pages
3699          *     were moved
3700          */
3701         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3702                 global $wgMaximumMovedPages;
3703                 // Check permissions
3704                 if ( !$this->userCan( 'move-subpages' ) ) {
3705                         return array( 'cant-move-subpages' );
3706                 }
3707                 // Do the source and target namespaces support subpages?
3708                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
3709                         return array( 'namespace-nosubpages',
3710                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3711                 }
3712                 if ( !MWNamespace::hasSubpages( $nt->getNamespace() ) ) {
3713                         return array( 'namespace-nosubpages',
3714                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3715                 }
3716
3717                 $subpages = $this->getSubpages( $wgMaximumMovedPages + 1 );
3718                 $retval = array();
3719                 $count = 0;
3720                 foreach ( $subpages as $oldSubpage ) {
3721                         $count++;
3722                         if ( $count > $wgMaximumMovedPages ) {
3723                                 $retval[$oldSubpage->getPrefixedTitle()] =
3724                                                 array( 'movepage-max-pages',
3725                                                         $wgMaximumMovedPages );
3726                                 break;
3727                         }
3728
3729                         // We don't know whether this function was called before
3730                         // or after moving the root page, so check both
3731                         // $this and $nt
3732                         if ( $oldSubpage->getArticleID() == $this->getArticleID() ||
3733                                         $oldSubpage->getArticleID() == $nt->getArticleID() )
3734                         {
3735                                 // When moving a page to a subpage of itself,
3736                                 // don't move it twice
3737                                 continue;
3738                         }
3739                         $newPageName = preg_replace(
3740                                         '#^' . preg_quote( $this->getDBkey(), '#' ) . '#',
3741                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3742                                         $oldSubpage->getDBkey() );
3743                         if ( $oldSubpage->isTalkPage() ) {
3744                                 $newNs = $nt->getTalkPage()->getNamespace();
3745                         } else {
3746                                 $newNs = $nt->getSubjectPage()->getNamespace();
3747                         }
3748                         # Bug 14385: we need makeTitleSafe because the new page names may
3749                         # be longer than 255 characters.
3750                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3751
3752                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3753                         if ( $success === true ) {
3754                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3755                         } else {
3756                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3757                         }
3758                 }
3759                 return $retval;
3760         }
3761
3762         /**
3763          * Checks if this page is just a one-rev redirect.
3764          * Adds lock, so don't use just for light purposes.
3765          *
3766          * @return Bool
3767          */
3768         public function isSingleRevRedirect() {
3769                 $dbw = wfGetDB( DB_MASTER );
3770                 # Is it a redirect?
3771                 $row = $dbw->selectRow( 'page',
3772                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3773                         $this->pageCond(),
3774                         __METHOD__,
3775                         array( 'FOR UPDATE' )
3776                 );
3777                 # Cache some fields we may want
3778                 $this->mArticleID = $row ? intval( $row->page_id ) : 0;
3779                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3780                 $this->mLatestID = $row ? intval( $row->page_latest ) : false;
3781                 if ( !$this->mRedirect ) {
3782                         return false;
3783                 }
3784                 # Does the article have a history?
3785                 $row = $dbw->selectField( array( 'page', 'revision' ),
3786                         'rev_id',
3787                         array( 'page_namespace' => $this->getNamespace(),
3788                                 'page_title' => $this->getDBkey(),
3789                                 'page_id=rev_page',
3790                                 'page_latest != rev_id'
3791                         ),
3792                         __METHOD__,
3793                         array( 'FOR UPDATE' )
3794                 );
3795                 # Return true if there was no history
3796                 return ( $row === false );
3797         }
3798
3799         /**
3800          * Checks if $this can be moved to a given Title
3801          * - Selects for update, so don't call it unless you mean business
3802          *
3803          * @param $nt Title the new title to check
3804          * @return Bool
3805          */
3806         public function isValidMoveTarget( $nt ) {
3807                 # Is it an existing file?
3808                 if ( $nt->getNamespace() == NS_FILE ) {
3809                         $file = wfLocalFile( $nt );
3810                         if ( $file->exists() ) {
3811                                 wfDebug( __METHOD__ . ": file exists\n" );
3812                                 return false;
3813                         }
3814                 }
3815                 # Is it a redirect with no history?
3816                 if ( !$nt->isSingleRevRedirect() ) {
3817                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3818                         return false;
3819                 }
3820                 # Get the article text
3821                 $rev = Revision::newFromTitle( $nt );
3822                 if( !is_object( $rev ) ){
3823                         return false;
3824                 }
3825                 $text = $rev->getText();
3826                 # Does the redirect point to the source?
3827                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3828                 $m = array();
3829                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3830                         $redirTitle = Title::newFromText( $m[1] );
3831                         if ( !is_object( $redirTitle ) ||
3832                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3833                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3834                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3835                                 return false;
3836                         }
3837                 } else {
3838                         # Fail safe
3839                         wfDebug( __METHOD__ . ": failsafe\n" );
3840                         return false;
3841                 }
3842                 return true;
3843         }
3844
3845         /**
3846          * Get categories to which this Title belongs and return an array of
3847          * categories' names.
3848          *
3849          * @return Array of parents in the form:
3850          *        $parent => $currentarticle
3851          */
3852         public function getParentCategories() {
3853                 global $wgContLang;
3854
3855                 $data = array();
3856
3857                 $titleKey = $this->getArticleID();
3858
3859                 if ( $titleKey === 0 ) {
3860                         return $data;
3861                 }
3862
3863                 $dbr = wfGetDB( DB_SLAVE );
3864
3865                 $res = $dbr->select( 'categorylinks', '*',
3866                         array(
3867                                 'cl_from' => $titleKey,
3868                         ),
3869                         __METHOD__,
3870                         array()
3871                 );
3872
3873                 if ( $dbr->numRows( $res ) > 0 ) {
3874                         foreach ( $res as $row ) {
3875                                 // $data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3876                                 $data[$wgContLang->getNSText( NS_CATEGORY ) . ':' . $row->cl_to] = $this->getFullText();
3877                         }
3878                 }
3879                 return $data;
3880         }
3881
3882         /**
3883          * Get a tree of parent categories
3884          *
3885          * @param $children Array with the children in the keys, to check for circular refs
3886          * @return Array Tree of parent categories
3887          */
3888         public function getParentCategoryTree( $children = array() ) {
3889                 $stack = array();
3890                 $parents = $this->getParentCategories();
3891
3892                 if ( $parents ) {
3893                         foreach ( $parents as $parent => $current ) {
3894                                 if ( array_key_exists( $parent, $children ) ) {
3895                                         # Circular reference
3896                                         $stack[$parent] = array();
3897                                 } else {
3898                                         $nt = Title::newFromText( $parent );
3899                                         if ( $nt ) {
3900                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array( $parent => 1 ) );
3901                                         }
3902                                 }
3903                         }
3904                 }
3905
3906                 return $stack;
3907         }
3908
3909         /**
3910          * Get an associative array for selecting this title from
3911          * the "page" table
3912          *
3913          * @return Array suitable for the $where parameter of DB::select()
3914          */
3915         public function pageCond() {
3916                 if ( $this->mArticleID > 0 ) {
3917                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3918                         return array( 'page_id' => $this->mArticleID );
3919                 } else {
3920                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3921                 }
3922         }
3923
3924         /**
3925          * Get the revision ID of the previous revision
3926          *
3927          * @param $revId Int Revision ID. Get the revision that was before this one.
3928          * @param $flags Int Title::GAID_FOR_UPDATE
3929          * @return Int|Bool Old revision ID, or FALSE if none exists
3930          */
3931         public function getPreviousRevisionID( $revId, $flags = 0 ) {
3932                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3933                 $revId = $db->selectField( 'revision', 'rev_id',
3934                         array(
3935                                 'rev_page' => $this->getArticleID( $flags ),
3936                                 'rev_id < ' . intval( $revId )
3937                         ),
3938                         __METHOD__,
3939                         array( 'ORDER BY' => 'rev_id DESC' )
3940                 );
3941
3942                 if ( $revId === false ) {
3943                         return false;
3944                 } else {
3945                         return intval( $revId );
3946                 }
3947         }
3948
3949         /**
3950          * Get the revision ID of the next revision
3951          *
3952          * @param $revId Int Revision ID. Get the revision that was after this one.
3953          * @param $flags Int Title::GAID_FOR_UPDATE
3954          * @return Int|Bool Next revision ID, or FALSE if none exists
3955          */
3956         public function getNextRevisionID( $revId, $flags = 0 ) {
3957                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3958                 $revId = $db->selectField( 'revision', 'rev_id',
3959                         array(
3960                                 'rev_page' => $this->getArticleID( $flags ),
3961                                 'rev_id > ' . intval( $revId )
3962                         ),
3963                         __METHOD__,
3964                         array( 'ORDER BY' => 'rev_id' )
3965                 );
3966
3967                 if ( $revId === false ) {
3968                         return false;
3969                 } else {
3970                         return intval( $revId );
3971                 }
3972         }
3973
3974         /**
3975          * Get the first revision of the page
3976          *
3977          * @param $flags Int Title::GAID_FOR_UPDATE
3978          * @return Revision|Null if page doesn't exist
3979          */
3980         public function getFirstRevision( $flags = 0 ) {
3981                 $pageId = $this->getArticleID( $flags );
3982                 if ( $pageId ) {
3983                         $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3984                         $row = $db->selectRow( 'revision', Revision::selectFields(),
3985                                 array( 'rev_page' => $pageId ),
3986                                 __METHOD__,
3987                                 array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3988                         );
3989                         if ( $row ) {
3990                                 return new Revision( $row );
3991                         }
3992                 }
3993                 return null;
3994         }
3995
3996         /**
3997          * Get the oldest revision timestamp of this page
3998          *
3999          * @param $flags Int Title::GAID_FOR_UPDATE
4000          * @return String: MW timestamp
4001          */
4002         public function getEarliestRevTime( $flags = 0 ) {
4003                 $rev = $this->getFirstRevision( $flags );
4004                 return $rev ? $rev->getTimestamp() : null;
4005         }
4006
4007         /**
4008          * Check if this is a new page
4009          *
4010          * @return bool
4011          */
4012         public function isNewPage() {
4013                 $dbr = wfGetDB( DB_SLAVE );
4014                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
4015         }
4016
4017         /**
4018          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
4019          *
4020          * @return bool
4021          */
4022         public function isBigDeletion() {
4023                 global $wgDeleteRevisionsLimit;
4024
4025                 if ( !$wgDeleteRevisionsLimit ) {
4026                         return false;
4027                 }
4028
4029                 $revCount = $this->estimateRevisionCount();
4030                 return $revCount > $wgDeleteRevisionsLimit;
4031         }
4032
4033         /**
4034          * Get the  approximate revision count of this page.
4035          *
4036          * @return int
4037          */
4038         public function estimateRevisionCount() {
4039                 if ( !$this->exists() ) {
4040                         return 0;
4041                 }
4042
4043                 if ( $this->mEstimateRevisions === null ) {
4044                         $dbr = wfGetDB( DB_SLAVE );
4045                         $this->mEstimateRevisions = $dbr->estimateRowCount( 'revision', '*',
4046                                 array( 'rev_page' => $this->getArticleID() ), __METHOD__ );
4047                 }
4048
4049                 return $this->mEstimateRevisions;
4050         }
4051
4052         /**
4053          * Get the number of revisions between the given revision.
4054          * Used for diffs and other things that really need it.
4055          *
4056          * @param $old int|Revision Old revision or rev ID (first before range)
4057          * @param $new int|Revision New revision or rev ID (first after range)
4058          * @return Int Number of revisions between these revisions.
4059          */
4060         public function countRevisionsBetween( $old, $new ) {
4061                 if ( !( $old instanceof Revision ) ) {
4062                         $old = Revision::newFromTitle( $this, (int)$old );
4063                 }
4064                 if ( !( $new instanceof Revision ) ) {
4065                         $new = Revision::newFromTitle( $this, (int)$new );
4066                 }
4067                 if ( !$old || !$new ) {
4068                         return 0; // nothing to compare
4069                 }
4070                 $dbr = wfGetDB( DB_SLAVE );
4071                 return (int)$dbr->selectField( 'revision', 'count(*)',
4072                         array(
4073                                 'rev_page' => $this->getArticleID(),
4074                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4075                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4076                         ),
4077                         __METHOD__
4078                 );
4079         }
4080
4081         /**
4082          * Get the number of authors between the given revision IDs.
4083          * Used for diffs and other things that really need it.
4084          *
4085          * @param $old int|Revision Old revision or rev ID (first before range)
4086          * @param $new int|Revision New revision or rev ID (first after range)
4087          * @param $limit Int Maximum number of authors
4088          * @return Int Number of revision authors between these revisions.
4089          */
4090         public function countAuthorsBetween( $old, $new, $limit ) {
4091                 if ( !( $old instanceof Revision ) ) {
4092                         $old = Revision::newFromTitle( $this, (int)$old );
4093                 }
4094                 if ( !( $new instanceof Revision ) ) {
4095                         $new = Revision::newFromTitle( $this, (int)$new );
4096                 }
4097                 if ( !$old || !$new ) {
4098                         return 0; // nothing to compare
4099                 }
4100                 $dbr = wfGetDB( DB_SLAVE );
4101                 $res = $dbr->select( 'revision', 'DISTINCT rev_user_text',
4102                         array(
4103                                 'rev_page' => $this->getArticleID(),
4104                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4105                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4106                         ), __METHOD__,
4107                         array( 'LIMIT' => $limit + 1 ) // add one so caller knows it was truncated
4108                 );
4109                 return (int)$dbr->numRows( $res );
4110         }
4111
4112         /**
4113          * Compare with another title.
4114          *
4115          * @param $title Title
4116          * @return Bool
4117          */
4118         public function equals( Title $title ) {
4119                 // Note: === is necessary for proper matching of number-like titles.
4120                 return $this->getInterwiki() === $title->getInterwiki()
4121                         && $this->getNamespace() == $title->getNamespace()
4122                         && $this->getDBkey() === $title->getDBkey();
4123         }
4124
4125         /**
4126          * Check if this title is a subpage of another title
4127          *
4128          * @param $title Title
4129          * @return Bool
4130          */
4131         public function isSubpageOf( Title $title ) {
4132                 return $this->getInterwiki() === $title->getInterwiki()
4133                         && $this->getNamespace() == $title->getNamespace()
4134                         && strpos( $this->getDBkey(), $title->getDBkey() . '/' ) === 0;
4135         }
4136
4137         /**
4138          * Check if page exists.  For historical reasons, this function simply
4139          * checks for the existence of the title in the page table, and will
4140          * thus return false for interwiki links, special pages and the like.
4141          * If you want to know if a title can be meaningfully viewed, you should
4142          * probably call the isKnown() method instead.
4143          *
4144          * @return Bool
4145          */
4146         public function exists() {
4147                 return $this->getArticleID() != 0;
4148         }
4149
4150         /**
4151          * Should links to this title be shown as potentially viewable (i.e. as
4152          * "bluelinks"), even if there's no record by this title in the page
4153          * table?
4154          *
4155          * This function is semi-deprecated for public use, as well as somewhat
4156          * misleadingly named.  You probably just want to call isKnown(), which
4157          * calls this function internally.
4158          *
4159          * (ISSUE: Most of these checks are cheap, but the file existence check
4160          * can potentially be quite expensive.  Including it here fixes a lot of
4161          * existing code, but we might want to add an optional parameter to skip
4162          * it and any other expensive checks.)
4163          *
4164          * @return Bool
4165          */
4166         public function isAlwaysKnown() {
4167                 $isKnown = null;
4168
4169                 /**
4170                  * Allows overriding default behaviour for determining if a page exists.
4171                  * If $isKnown is kept as null, regular checks happen. If it's
4172                  * a boolean, this value is returned by the isKnown method.
4173                  *
4174                  * @since 1.20
4175                  *
4176                  * @param Title $title
4177                  * @param boolean|null $isKnown
4178                  */
4179                 wfRunHooks( 'TitleIsAlwaysKnown', array( $this, &$isKnown ) );
4180
4181                 if ( !is_null( $isKnown ) ) {
4182                         return $isKnown;
4183                 }
4184
4185                 if ( $this->mInterwiki != '' ) {
4186                         return true;  // any interwiki link might be viewable, for all we know
4187                 }
4188
4189                 switch( $this->mNamespace ) {
4190                         case NS_MEDIA:
4191                         case NS_FILE:
4192                                 // file exists, possibly in a foreign repo
4193                                 return (bool)wfFindFile( $this );
4194                         case NS_SPECIAL:
4195                                 // valid special page
4196                                 return SpecialPageFactory::exists( $this->getDBkey() );
4197                         case NS_MAIN:
4198                                 // selflink, possibly with fragment
4199                                 return $this->mDbkeyform == '';
4200                         case NS_MEDIAWIKI:
4201                                 // known system message
4202                                 return $this->hasSourceText() !== false;
4203                         default:
4204                                 return false;
4205                 }
4206         }
4207
4208         /**
4209          * Does this title refer to a page that can (or might) be meaningfully
4210          * viewed?  In particular, this function may be used to determine if
4211          * links to the title should be rendered as "bluelinks" (as opposed to
4212          * "redlinks" to non-existent pages).
4213          * Adding something else to this function will cause inconsistency
4214          * since LinkHolderArray calls isAlwaysKnown() and does its own
4215          * page existence check.
4216          *
4217          * @return Bool
4218          */
4219         public function isKnown() {
4220                 return $this->isAlwaysKnown() || $this->exists();
4221         }
4222
4223         /**
4224          * Does this page have source text?
4225          *
4226          * @return Boolean
4227          */
4228         public function hasSourceText() {
4229                 if ( $this->exists() ) {
4230                         return true;
4231                 }
4232
4233                 if ( $this->mNamespace == NS_MEDIAWIKI ) {
4234                         // If the page doesn't exist but is a known system message, default
4235                         // message content will be displayed, same for language subpages-
4236                         // Use always content language to avoid loading hundreds of languages
4237                         // to get the link color.
4238                         global $wgContLang;
4239                         list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4240                         $message = wfMessage( $name )->inLanguage( $wgContLang )->useDatabase( false );
4241                         return $message->exists();
4242                 }
4243
4244                 return false;
4245         }
4246
4247         /**
4248          * Get the default message text or false if the message doesn't exist
4249          *
4250          * @return String or false
4251          */
4252         public function getDefaultMessageText() {
4253                 global $wgContLang;
4254
4255                 if ( $this->getNamespace() != NS_MEDIAWIKI ) { // Just in case
4256                         return false;
4257                 }
4258
4259                 list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4260                 $message = wfMessage( $name )->inLanguage( $lang )->useDatabase( false );
4261
4262                 if ( $message->exists() ) {
4263                         return $message->plain();
4264                 } else {
4265                         return false;
4266                 }
4267         }
4268
4269         /**
4270          * Updates page_touched for this page; called from LinksUpdate.php
4271          *
4272          * @return Bool true if the update succeded
4273          */
4274         public function invalidateCache() {
4275                 if ( wfReadOnly() ) {
4276                         return false;
4277                 }
4278                 $dbw = wfGetDB( DB_MASTER );
4279                 $success = $dbw->update(
4280                         'page',
4281                         array( 'page_touched' => $dbw->timestamp() ),
4282                         $this->pageCond(),
4283                         __METHOD__
4284                 );
4285                 HTMLFileCache::clearFileCache( $this );
4286                 return $success;
4287         }
4288
4289         /**
4290          * Update page_touched timestamps and send squid purge messages for
4291          * pages linking to this title. May be sent to the job queue depending
4292          * on the number of links. Typically called on create and delete.
4293          */
4294         public function touchLinks() {
4295                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
4296                 $u->doUpdate();
4297
4298                 if ( $this->getNamespace() == NS_CATEGORY ) {
4299                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
4300                         $u->doUpdate();
4301                 }
4302         }
4303
4304         /**
4305          * Get the last touched timestamp
4306          *
4307          * @param $db DatabaseBase: optional db
4308          * @return String last-touched timestamp
4309          */
4310         public function getTouched( $db = null ) {
4311                 $db = isset( $db ) ? $db : wfGetDB( DB_SLAVE );
4312                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
4313                 return $touched;
4314         }
4315
4316         /**
4317          * Get the timestamp when this page was updated since the user last saw it.
4318          *
4319          * @param $user User
4320          * @return String|Null
4321          */
4322         public function getNotificationTimestamp( $user = null ) {
4323                 global $wgUser, $wgShowUpdatedMarker;
4324                 // Assume current user if none given
4325                 if ( !$user ) {
4326                         $user = $wgUser;
4327                 }
4328                 // Check cache first
4329                 $uid = $user->getId();
4330                 // avoid isset here, as it'll return false for null entries
4331                 if ( array_key_exists( $uid, $this->mNotificationTimestamp ) ) {
4332                         return $this->mNotificationTimestamp[$uid];
4333                 }
4334                 if ( !$uid || !$wgShowUpdatedMarker ) {
4335                         return $this->mNotificationTimestamp[$uid] = false;
4336                 }
4337                 // Don't cache too much!
4338                 if ( count( $this->mNotificationTimestamp ) >= self::CACHE_MAX ) {
4339                         $this->mNotificationTimestamp = array();
4340                 }
4341                 $dbr = wfGetDB( DB_SLAVE );
4342                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
4343                         'wl_notificationtimestamp',
4344                         array(
4345                                 'wl_user' => $user->getId(),
4346                                 'wl_namespace' => $this->getNamespace(),
4347                                 'wl_title' => $this->getDBkey(),
4348                         ),
4349                         __METHOD__
4350                 );
4351                 return $this->mNotificationTimestamp[$uid];
4352         }
4353
4354         /**
4355          * Generate strings used for xml 'id' names in monobook tabs
4356          *
4357          * @param $prepend string defaults to 'nstab-'
4358          * @return String XML 'id' name
4359          */
4360         public function getNamespaceKey( $prepend = 'nstab-' ) {
4361                 global $wgContLang;
4362                 // Gets the subject namespace if this title
4363                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4364                 // Checks if cononical namespace name exists for namespace
4365                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4366                         // Uses canonical namespace name
4367                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4368                 } else {
4369                         // Uses text of namespace
4370                         $namespaceKey = $this->getSubjectNsText();
4371                 }
4372                 // Makes namespace key lowercase
4373                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4374                 // Uses main
4375                 if ( $namespaceKey == '' ) {
4376                         $namespaceKey = 'main';
4377                 }
4378                 // Changes file to image for backwards compatibility
4379                 if ( $namespaceKey == 'file' ) {
4380                         $namespaceKey = 'image';
4381                 }
4382                 return $prepend . $namespaceKey;
4383         }
4384
4385         /**
4386          * Get all extant redirects to this Title
4387          *
4388          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4389          * @return Array of Title redirects to this title
4390          */
4391         public function getRedirectsHere( $ns = null ) {
4392                 $redirs = array();
4393
4394                 $dbr = wfGetDB( DB_SLAVE );
4395                 $where = array(
4396                         'rd_namespace' => $this->getNamespace(),
4397                         'rd_title' => $this->getDBkey(),
4398                         'rd_from = page_id'
4399                 );
4400                 if ( !is_null( $ns ) ) {
4401                         $where['page_namespace'] = $ns;
4402                 }
4403
4404                 $res = $dbr->select(
4405                         array( 'redirect', 'page' ),
4406                         array( 'page_namespace', 'page_title' ),
4407                         $where,
4408                         __METHOD__
4409                 );
4410
4411                 foreach ( $res as $row ) {
4412                         $redirs[] = self::newFromRow( $row );
4413                 }
4414                 return $redirs;
4415         }
4416
4417         /**
4418          * Check if this Title is a valid redirect target
4419          *
4420          * @return Bool
4421          */
4422         public function isValidRedirectTarget() {
4423                 global $wgInvalidRedirectTargets;
4424
4425                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4426                 if ( $this->isSpecial( 'Userlogout' ) ) {
4427                         return false;
4428                 }
4429
4430                 foreach ( $wgInvalidRedirectTargets as $target ) {
4431                         if ( $this->isSpecial( $target ) ) {
4432                                 return false;
4433                         }
4434                 }
4435
4436                 return true;
4437         }
4438
4439         /**
4440          * Get a backlink cache object
4441          *
4442          * @return BacklinkCache
4443          */
4444         function getBacklinkCache() {
4445                 if ( is_null( $this->mBacklinkCache ) ) {
4446                         $this->mBacklinkCache = new BacklinkCache( $this );
4447                 }
4448                 return $this->mBacklinkCache;
4449         }
4450
4451         /**
4452          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4453          *
4454          * @return Boolean
4455          */
4456         public function canUseNoindex() {
4457                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4458
4459                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4460                         ? $wgContentNamespaces
4461                         : $wgExemptFromUserRobotsControl;
4462
4463                 return !in_array( $this->mNamespace, $bannedNamespaces );
4464
4465         }
4466
4467         /**
4468          * Returns the raw sort key to be used for categories, with the specified
4469          * prefix.  This will be fed to Collation::getSortKey() to get a
4470          * binary sortkey that can be used for actual sorting.
4471          *
4472          * @param $prefix string The prefix to be used, specified using
4473          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4474          *   prefix.
4475          * @return string
4476          */
4477         public function getCategorySortkey( $prefix = '' ) {
4478                 $unprefixed = $this->getText();
4479
4480                 // Anything that uses this hook should only depend
4481                 // on the Title object passed in, and should probably
4482                 // tell the users to run updateCollations.php --force
4483                 // in order to re-sort existing category relations.
4484                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4485                 if ( $prefix !== '' ) {
4486                         # Separate with a line feed, so the unprefixed part is only used as
4487                         # a tiebreaker when two pages have the exact same prefix.
4488                         # In UCA, tab is the only character that can sort above LF
4489                         # so we strip both of them from the original prefix.
4490                         $prefix = strtr( $prefix, "\n\t", '  ' );
4491                         return "$prefix\n$unprefixed";
4492                 }
4493                 return $unprefixed;
4494         }
4495
4496         /**
4497          * Get the language in which the content of this page is written.
4498          * Defaults to $wgContLang, but in certain cases it can be e.g.
4499          * $wgLang (such as special pages, which are in the user language).
4500          *
4501          * @since 1.18
4502          * @return Language
4503          */
4504         public function getPageLanguage() {
4505                 global $wgLang;
4506                 if ( $this->isSpecialPage() ) {
4507                         // special pages are in the user language
4508                         return $wgLang;
4509                 } elseif ( $this->isCssOrJsPage() || $this->isCssJsSubpage() ) {
4510                         // css/js should always be LTR and is, in fact, English
4511                         return wfGetLangObj( 'en' );
4512                 } elseif ( $this->getNamespace() == NS_MEDIAWIKI ) {
4513                         // Parse mediawiki messages with correct target language
4514                         list( /* $unused */, $lang ) = MessageCache::singleton()->figureMessage( $this->getText() );
4515                         return wfGetLangObj( $lang );
4516                 }
4517                 global $wgContLang;
4518                 // If nothing special, it should be in the wiki content language
4519                 $pageLang = $wgContLang;
4520                 // Hook at the end because we don't want to override the above stuff
4521                 wfRunHooks( 'PageContentLanguage', array( $this, &$pageLang, $wgLang ) );
4522                 return wfGetLangObj( $pageLang );
4523         }
4524 }