includes/Title.php

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