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         var $mCounter = -1;               // /< Number of times this page has been viewed (-1 means "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|false 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                         if ( isset( $row->page_counter ) )
 277                                 $this->mCounter = (int)$row->page_counter;
 278                 } else { // page not found
 279                         $this->mArticleID = 0;
 280                         $this->mLength = 0;
 281                         $this->mRedirect = false;
 282                         $this->mLatestID = 0;
 283                         $this->mCounter = 0;
 284                 }
 285         }
 286
 287         /**
 288          * Create a new Title from a namespace index and a DB key.
 289          * It's assumed that $ns and $title are *valid*, for instance when
 290          * they came directly from the database or a special page name.
 291          * For convenience, spaces are converted to underscores so that
 292          * eg user_text fields can be used directly.
 293          *
 294          * @param $ns Int the namespace of the article
 295          * @param $title String the unprefixed database key form
 296          * @param $fragment String the link fragment (after the "#")
 297          * @param $interwiki String the interwiki prefix
 298          * @return Title the new object
 299          */
 300         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 301                 $t = new Title();
 302                 $t->mInterwiki = $interwiki;
 303                 $t->mFragment = $fragment;
 304                 $t->mNamespace = $ns = intval( $ns );
 305                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 306                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 307                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 308                 $t->mTextform = str_replace( '_', ' ', $title );
 309                 return $t;
 310         }
 311
 312         /**
 313          * Create a new Title from a namespace index and a DB key.
 314          * The parameters will be checked for validity, which is a bit slower
 315          * than makeTitle() but safer for user-provided data.
 316          *
 317          * @param $ns Int the namespace of the article
 318          * @param $title String database key form
 319          * @param $fragment String the link fragment (after the "#")
 320          * @param $interwiki String interwiki prefix
 321          * @return Title the new object, or NULL on an error
 322          */
 323         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 324                 $t = new Title();
 325                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 326                 if ( $t->secureAndSplit() ) {
 327                         return $t;
 328                 } else {
 329                         return null;
 330                 }
 331         }
 332
 333         /**
 334          * Create a new Title for the Main Page
 335          *
 336          * @return Title the new object
 337          */
 338         public static function newMainPage() {
 339                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 340                 // Don't give fatal errors if the message is broken
 341                 if ( !$title ) {
 342                         $title = Title::newFromText( 'Main Page' );
 343                 }
 344                 return $title;
 345         }
 346
 347         /**
 348          * Extract a redirect destination from a string and return the
 349          * Title, or null if the text doesn't contain a valid redirect
 350          * This will only return the very next target, useful for
 351          * the redirect table and other checks that don't need full recursion
 352          *
 353          * @param $text String: Text with possible redirect
 354          * @return Title: The corresponding Title
 355          */
 356         public static function newFromRedirect( $text ) {
 357                 return self::newFromRedirectInternal( $text );
 358         }
 359
 360         /**
 361          * Extract a redirect destination from a string and return the
 362          * Title, or null if the text doesn't contain a valid redirect
 363          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 364          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 365          *
 366          * @param $text String Text with possible redirect
 367          * @return Title
 368          */
 369         public static function newFromRedirectRecurse( $text ) {
 370                 $titles = self::newFromRedirectArray( $text );
 371                 return $titles ? array_pop( $titles ) : null;
 372         }
 373
 374         /**
 375          * Extract a redirect destination from a string and return an
 376          * array of Titles, or null if the text doesn't contain a valid redirect
 377          * The last element in the array is the final destination after all redirects
 378          * have been resolved (up to $wgMaxRedirects times)
 379          *
 380          * @param $text String Text with possible redirect
 381          * @return Array of Titles, with the destination last
 382          */
 383         public static function newFromRedirectArray( $text ) {
 384                 global $wgMaxRedirects;
 385                 $title = self::newFromRedirectInternal( $text );
 386                 if ( is_null( $title ) ) {
 387                         return null;
 388                 }
 389                 // recursive check to follow double redirects
 390                 $recurse = $wgMaxRedirects;
 391                 $titles = array( $title );
 392                 while ( --$recurse > 0 ) {
 393                         if ( $title->isRedirect() ) {
 394                                 $page = WikiPage::factory( $title );
 395                                 $newtitle = $page->getRedirectTarget();
 396                         } else {
 397                                 break;
 398                         }
 399                         // Redirects to some special pages are not permitted
 400                         if ( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 401                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 402                                 $title = $newtitle;
 403                                 $titles[] = $newtitle;
 404                         } else {
 405                                 break;
 406                         }
 407                 }
 408                 return $titles;
 409         }
 410
 411         /**
 412          * Really extract the redirect destination
 413          * Do not call this function directly, use one of the newFromRedirect* functions above
 414          *
 415          * @param $text String Text with possible redirect
 416          * @return Title
 417          */
 418         protected static function newFromRedirectInternal( $text ) {
 419                 global $wgMaxRedirects;
 420                 if ( $wgMaxRedirects < 1 ) {
 421                         //redirects are disabled, so quit early
 422                         return null;
 423                 }
 424                 $redir = MagicWord::get( 'redirect' );
 425                 $text = trim( $text );
 426                 if ( $redir->matchStartAndRemove( $text ) ) {
 427                         // Extract the first link and see if it's usable
 428                         // Ensure that it really does come directly after #REDIRECT
 429                         // Some older redirects included a colon, so don't freak about that!
 430                         $m = array();
 431                         if ( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 432                                 // Strip preceding colon used to "escape" categories, etc.
 433                                 // and URL-decode links
 434                                 if ( strpos( $m[1], '%' ) !== false ) {
 435                                         // Match behavior of inline link parsing here;
 436                                         $m[1] = rawurldecode( ltrim( $m[1], ':' ) );
 437                                 }
 438                                 $title = Title::newFromText( $m[1] );
 439                                 // If the title is a redirect to bad special pages or is invalid, return null
 440                                 if ( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 441                                         return null;
 442                                 }
 443                                 return $title;
 444                         }
 445                 }
 446                 return null;
 447         }
 448
 449         /**
 450          * Get the prefixed DB key associated with an ID
 451          *
 452          * @param $id Int the page_id of the article
 453          * @return Title an object representing the article, or NULL if no such article was found
 454          */
 455         public static function nameOf( $id ) {
 456                 $dbr = wfGetDB( DB_SLAVE );
 457
 458                 $s = $dbr->selectRow(
 459                         'page',
 460                         array( 'page_namespace', 'page_title' ),
 461                         array( 'page_id' => $id ),
 462                         __METHOD__
 463                 );
 464                 if ( $s === false ) {
 465                         return null;
 466                 }
 467
 468                 $n = self::makeName( $s->page_namespace, $s->page_title );
 469                 return $n;
 470         }
 471
 472         /**
 473          * Get a regex character class describing the legal characters in a link
 474          *
 475          * @return String the list of characters, not delimited
 476          */
 477         public static function legalChars() {
 478                 global $wgLegalTitleChars;
 479                 return $wgLegalTitleChars;
 480         }
 481
 482         /**
 483          * Returns a simple regex that will match on characters and sequences invalid in titles.
 484          * Note that this doesn't pick up many things that could be wrong with titles, but that
 485          * replacing this regex with something valid will make many titles valid.
 486          *
 487          * @return String regex string
 488          */
 489         static function getTitleInvalidRegex() {
 490                 static $rxTc = false;
 491                 if ( !$rxTc ) {
 492                         # Matching titles will be held as illegal.
 493                         $rxTc = '/' .
 494                                 # Any character not allowed is forbidden...
 495                                 '[^' . self::legalChars() . ']' .
 496                                 # URL percent encoding sequences interfere with the ability
 497                                 # to round-trip titles -- you can't link to them consistently.
 498                                 '|%[0-9A-Fa-f]{2}' .
 499                                 # XML/HTML character references produce similar issues.
 500                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 501                                 '|&#[0-9]+;' .
 502                                 '|&#x[0-9A-Fa-f]+;' .
 503                                 '/S';
 504                 }
 505
 506                 return $rxTc;
 507         }
 508
 509         /**
 510          * Get a string representation of a title suitable for
 511          * including in a search index
 512          *
 513          * @param $ns Int a namespace index
 514          * @param $title String text-form main part
 515          * @return String a stripped-down title string ready for the search index
 516          */
 517         public static function indexTitle( $ns, $title ) {
 518                 global $wgContLang;
 519
 520                 $lc = SearchEngine::legalSearchChars() . '&#;';
 521                 $t = $wgContLang->normalizeForSearch( $title );
 522                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 523                 $t = $wgContLang->lc( $t );
 524
 525                 # Handle 's, s'
 526                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 527                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 528
 529                 $t = preg_replace( "/\\s+/", ' ', $t );
 530
 531                 if ( $ns == NS_FILE ) {
 532                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 533                 }
 534                 return trim( $t );
 535         }
 536
 537         /**
 538          * Make a prefixed DB key from a DB key and a namespace index
 539          *
 540          * @param $ns Int numerical representation of the namespace
 541          * @param $title String the DB key form the title
 542          * @param $fragment String The link fragment (after the "#")
 543          * @param $interwiki String The interwiki prefix
 544          * @return String the prefixed form of the title
 545          */
 546         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 547                 global $wgContLang;
 548
 549                 $namespace = $wgContLang->getNsText( $ns );
 550                 $name = $namespace == '' ? $title : "$namespace:$title";
 551                 if ( strval( $interwiki ) != '' ) {
 552                         $name = "$interwiki:$name";
 553                 }
 554                 if ( strval( $fragment ) != '' ) {
 555                         $name .= '#' . $fragment;
 556                 }
 557                 return $name;
 558         }
 559
 560         /**
 561          * Escape a text fragment, say from a link, for a URL
 562          *
 563          * @param $fragment string containing a URL or link fragment (after the "#")
 564          * @return String: escaped string
 565          */
 566         static function escapeFragmentForURL( $fragment ) {
 567                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 568                 # fragments appear not to work in IE (at least up to 7) or in at least
 569                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 570                 # to care if they aren't encoded.
 571                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 572         }
 573
 574         /**
 575          * Callback for usort() to do title sorts by (namespace, title)
 576          *
 577          * @param $a Title
 578          * @param $b Title
 579          *
 580          * @return Integer: result of string comparison, or namespace comparison
 581          */
 582         public static function compare( $a, $b ) {
 583                 if ( $a->getNamespace() == $b->getNamespace() ) {
 584                         return strcmp( $a->getText(), $b->getText() );
 585                 } else {
 586                         return $a->getNamespace() - $b->getNamespace();
 587                 }
 588         }
 589
 590         /**
 591          * Determine whether the object refers to a page within
 592          * this project.
 593          *
 594          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 595          */
 596         public function isLocal() {
 597                 if ( $this->mInterwiki != '' ) {
 598                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 599                 } else {
 600                         return true;
 601                 }
 602         }
 603
 604         /**
 605          * Is this Title interwiki?
 606          *
 607          * @return Bool
 608          */
 609         public function isExternal() {
 610                 return ( $this->mInterwiki != '' );
 611         }
 612
 613         /**
 614          * Get the interwiki prefix (or null string)
 615          *
 616          * @return String Interwiki prefix
 617          */
 618         public function getInterwiki() {
 619                 return $this->mInterwiki;
 620         }
 621
 622         /**
 623          * Determine whether the object refers to a page within
 624          * this project and is transcludable.
 625          *
 626          * @return Bool TRUE if this is transcludable
 627          */
 628         public function isTrans() {
 629                 if ( $this->mInterwiki == '' ) {
 630                         return false;
 631                 }
 632
 633                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 634         }
 635
 636         /**
 637          * Returns the DB name of the distant wiki which owns the object.
 638          *
 639          * @return String the DB name
 640          */
 641         public function getTransWikiID() {
 642                 if ( $this->mInterwiki == '' ) {
 643                         return false;
 644                 }
 645
 646                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 647         }
 648
 649         /**
 650          * Get the text form (spaces not underscores) of the main part
 651          *
 652          * @return String Main part of the title
 653          */
 654         public function getText() {
 655                 return $this->mTextform;
 656         }
 657
 658         /**
 659          * Get the URL-encoded form of the main part
 660          *
 661          * @return String Main part of the title, URL-encoded
 662          */
 663         public function getPartialURL() {
 664                 return $this->mUrlform;
 665         }
 666
 667         /**
 668          * Get the main part with underscores
 669          *
 670          * @return String: Main part of the title, with underscores
 671          */
 672         public function getDBkey() {
 673                 return $this->mDbkeyform;
 674         }
 675
 676         /**
 677          * Get the DB key with the initial letter case as specified by the user
 678          *
 679          * @return String DB key
 680          */
 681         function getUserCaseDBKey() {
 682                 return $this->mUserCaseDBKey;
 683         }
 684
 685         /**
 686          * Get the namespace index, i.e. one of the NS_xxxx constants.
 687          *
 688          * @return Integer: Namespace index
 689          */
 690         public function getNamespace() {
 691                 return $this->mNamespace;
 692         }
 693
 694         /**
 695          * Get the namespace text
 696          *
 697          * @return String: Namespace text
 698          */
 699         public function getNsText() {
 700                 global $wgContLang;
 701
 702                 if ( $this->mInterwiki != '' ) {
 703                         // This probably shouldn't even happen. ohh man, oh yuck.
 704                         // But for interwiki transclusion it sometimes does.
 705                         // Shit. Shit shit shit.
 706                         //
 707                         // Use the canonical namespaces if possible to try to
 708                         // resolve a foreign namespace.
 709                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 710                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 711                         }
 712                 }
 713
 714                 // Strip off subpages
 715                 $pagename = $this->getText();
 716                 if ( strpos( $pagename, '/' ) !== false ) {
 717                         list( $username , ) = explode( '/', $pagename, 2 );
 718                 } else {
 719                         $username = $pagename;
 720                 }
 721
 722                 if ( $wgContLang->needsGenderDistinction() &&
 723                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 724                         $gender = GenderCache::singleton()->getGenderOf( $username, __METHOD__ );
 725                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 726                 }
 727
 728                 return $wgContLang->getNsText( $this->mNamespace );
 729         }
 730
 731         /**
 732          * Get the namespace text of the subject (rather than talk) page
 733          *
 734          * @return String Namespace text
 735          */
 736         public function getSubjectNsText() {
 737                 global $wgContLang;
 738                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 739         }
 740
 741         /**
 742          * Get the namespace text of the talk page
 743          *
 744          * @return String Namespace text
 745          */
 746         public function getTalkNsText() {
 747                 global $wgContLang;
 748                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 749         }
 750
 751         /**
 752          * Could this title have a corresponding talk page?
 753          *
 754          * @return Bool TRUE or FALSE
 755          */
 756         public function canTalk() {
 757                 return( MWNamespace::canTalk( $this->mNamespace ) );
 758         }
 759
 760         /**
 761          * Is this in a namespace that allows actual pages?
 762          *
 763          * @return Bool
 764          * @internal note -- uses hardcoded namespace index instead of constants
 765          */
 766         public function canExist() {
 767                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
 768         }
 769
 770         /**
 771          * Can this title be added to a user's watchlist?
 772          *
 773          * @return Bool TRUE or FALSE
 774          */
 775         public function isWatchable() {
 776                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 777         }
 778
 779         /**
 780          * Returns true if this is a special page.
 781          *
 782          * @return boolean
 783          */
 784         public function isSpecialPage() {
 785                 return $this->getNamespace() == NS_SPECIAL;
 786         }
 787
 788         /**
 789          * Returns true if this title resolves to the named special page
 790          *
 791          * @param $name String The special page name
 792          * @return boolean
 793          */
 794         public function isSpecial( $name ) {
 795                 if ( $this->isSpecialPage() ) {
 796                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 797                         if ( $name == $thisName ) {
 798                                 return true;
 799                         }
 800                 }
 801                 return false;
 802         }
 803
 804         /**
 805          * If the Title refers to a special page alias which is not the local default, resolve
 806          * the alias, and localise the name as necessary.  Otherwise, return $this
 807          *
 808          * @return Title
 809          */
 810         public function fixSpecialName() {
 811                 if ( $this->isSpecialPage() ) {
 812                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 813                         if ( $canonicalName ) {
 814                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 815                                 if ( $localName != $this->mDbkeyform ) {
 816                                         return Title::makeTitle( NS_SPECIAL, $localName );
 817                                 }
 818                         }
 819                 }
 820                 return $this;
 821         }
 822
 823         /**
 824          * Returns true if the title is inside the specified namespace.
 825          *
 826          * Please make use of this instead of comparing to getNamespace()
 827          * This function is much more resistant to changes we may make
 828          * to namespaces than code that makes direct comparisons.
 829          * @param $ns int The namespace
 830          * @return bool
 831          * @since 1.19
 832          */
 833         public function inNamespace( $ns ) {
 834                 return MWNamespace::equals( $this->getNamespace(), $ns );
 835         }
 836
 837         /**
 838          * Returns true if the title is inside one of the specified namespaces.
 839          *
 840          * @param ...$namespaces The namespaces to check for
 841          * @return bool
 842          * @since 1.19
 843          */
 844         public function inNamespaces( /* ... */ ) {
 845                 $namespaces = func_get_args();
 846                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 847                         $namespaces = $namespaces[0];
 848                 }
 849
 850                 foreach ( $namespaces as $ns ) {
 851                         if ( $this->inNamespace( $ns ) ) {
 852                                 return true;
 853                         }
 854                 }
 855
 856                 return false;
 857         }
 858
 859         /**
 860          * Returns true if the title has the same subject namespace as the
 861          * namespace specified.
 862          * For example this method will take NS_USER and return true if namespace
 863          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 864          * as their subject namespace.
 865          *
 866          * This is MUCH simpler than individually testing for equivilance
 867          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 868          * @since 1.19
 869          */
 870         public function hasSubjectNamespace( $ns ) {
 871                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 872         }
 873
 874         /**
 875          * Is this Title in a namespace which contains content?
 876          * In other words, is this a content page, for the purposes of calculating
 877          * statistics, etc?
 878          *
 879          * @return Boolean
 880          */
 881         public function isContentPage() {
 882                 return MWNamespace::isContent( $this->getNamespace() );
 883         }
 884
 885         /**
 886          * Would anybody with sufficient privileges be able to move this page?
 887          * Some pages just aren't movable.
 888          *
 889          * @return Bool TRUE or FALSE
 890          */
 891         public function isMovable() {
 892                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 893                         // Interwiki title or immovable namespace. Hooks don't get to override here
 894                         return false;
 895                 }
 896
 897                 $result = true;
 898                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 899                 return $result;
 900         }
 901
 902         /**
 903          * Is this the mainpage?
 904          * @note Title::newFromText seams to be sufficiently optimized by the title
 905          * cache that we don't need to over-optimize by doing direct comparisons and
 906          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 907          * ends up reporting something differently than $title->isMainPage();
 908          *
 909          * @since 1.18
 910          * @return Bool
 911          */
 912         public function isMainPage() {
 913                 return $this->equals( Title::newMainPage() );
 914         }
 915
 916         /**
 917          * Is this a subpage?
 918          *
 919          * @return Bool
 920          */
 921         public function isSubpage() {
 922                 return MWNamespace::hasSubpages( $this->mNamespace )
 923                         ? strpos( $this->getText(), '/' ) !== false
 924                         : false;
 925         }
 926
 927         /**
 928          * Is this a conversion table for the LanguageConverter?
 929          *
 930          * @return Bool
 931          */
 932         public function isConversionTable() {
 933                 return $this->getNamespace() == NS_MEDIAWIKI &&
 934                         strpos( $this->getText(), 'Conversiontable' ) !== false;
 935         }
 936
 937         /**
 938          * Does that page contain wikitext, or it is JS, CSS or whatever?
 939          *
 940          * @return Bool
 941          */
 942         public function isWikitextPage() {
 943                 $retval = !$this->isCssOrJsPage() && !$this->isCssJsSubpage();
 944                 wfRunHooks( 'TitleIsWikitextPage', array( $this, &$retval ) );
 945                 return $retval;
 946         }
 947
 948         /**
 949          * Could this page contain custom CSS or JavaScript, based
 950          * on the title?
 951          *
 952          * @return Bool
 953          */
 954         public function isCssOrJsPage() {
 955                 $retval = $this->mNamespace == NS_MEDIAWIKI
 956                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
 957                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$retval ) );
 958                 return $retval;
 959         }
 960
 961         /**
 962          * Is this a .css or .js subpage of a user page?
 963          * @return Bool
 964          */
 965         public function isCssJsSubpage() {
 966                 return ( NS_USER == $this->mNamespace and preg_match( "/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
 967         }
 968
 969         /**
 970          * Is this a *valid* .css or .js subpage of a user page?
 971          *
 972          * @return Bool
 973          * @deprecated since 1.17
 974          */
 975         public function isValidCssJsSubpage() {
 976                 wfDeprecated( __METHOD__, '1.17' );
 977                 return $this->isCssJsSubpage();
 978         }
 979
 980         /**
 981          * Trim down a .css or .js subpage title to get the corresponding skin name
 982          *
 983          * @return string containing skin name from .css or .js subpage title
 984          */
 985         public function getSkinFromCssJsSubpage() {
 986                 $subpage = explode( '/', $this->mTextform );
 987                 $subpage = $subpage[ count( $subpage ) - 1 ];
 988                 $lastdot = strrpos( $subpage, '.' );
 989                 if ( $lastdot === false )
 990                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
 991                 return substr( $subpage, 0, $lastdot );
 992         }
 993
 994         /**
 995          * Is this a .css subpage of a user page?
 996          *
 997          * @return Bool
 998          */
 999         public function isCssSubpage() {
1000                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.css$/", $this->mTextform ) );
1001         }
1002
1003         /**
1004          * Is this a .js subpage of a user page?
1005          *
1006          * @return Bool
1007          */
1008         public function isJsSubpage() {
1009                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.js$/", $this->mTextform ) );
1010         }
1011
1012         /**
1013          * Is this a talk page of some sort?
1014          *
1015          * @return Bool
1016          */
1017         public function isTalkPage() {
1018                 return MWNamespace::isTalk( $this->getNamespace() );
1019         }
1020
1021         /**
1022          * Get a Title object associated with the talk page of this article
1023          *
1024          * @return Title the object for the talk page
1025          */
1026         public function getTalkPage() {
1027                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1028         }
1029
1030         /**
1031          * Get a title object associated with the subject page of this
1032          * talk page
1033          *
1034          * @return Title the object for the subject page
1035          */
1036         public function getSubjectPage() {
1037                 // Is this the same title?
1038                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1039                 if ( $this->getNamespace() == $subjectNS ) {
1040                         return $this;
1041                 }
1042                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1043         }
1044
1045         /**
1046          * Get the default namespace index, for when there is no namespace
1047          *
1048          * @return Int Default namespace index
1049          */
1050         public function getDefaultNamespace() {
1051                 return $this->mDefaultNamespace;
1052         }
1053
1054         /**
1055          * Get title for search index
1056          *
1057          * @return String a stripped-down title string ready for the
1058          *  search index
1059          */
1060         public function getIndexTitle() {
1061                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1062         }
1063
1064         /**
1065          * Get the Title fragment (i.e.\ the bit after the #) in text form
1066          *
1067          * @return String Title fragment
1068          */
1069         public function getFragment() {
1070                 return $this->mFragment;
1071         }
1072
1073         /**
1074          * Get the fragment in URL form, including the "#" character if there is one
1075          * @return String Fragment in URL form
1076          */
1077         public function getFragmentForURL() {
1078                 if ( $this->mFragment == '' ) {
1079                         return '';
1080                 } else {
1081                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1082                 }
1083         }
1084
1085         /**
1086          * Set the fragment for this title. Removes the first character from the
1087          * specified fragment before setting, so it assumes you're passing it with
1088          * an initial "#".
1089          *
1090          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1091          * Still in active use privately.
1092          *
1093          * @param $fragment String text
1094          */
1095         public function setFragment( $fragment ) {
1096                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1097         }
1098
1099         /**
1100          * Prefix some arbitrary text with the namespace or interwiki prefix
1101          * of this object
1102          *
1103          * @param $name String the text
1104          * @return String the prefixed text
1105          * @private
1106          */
1107         private function prefix( $name ) {
1108                 $p = '';
1109                 if ( $this->mInterwiki != '' ) {
1110                         $p = $this->mInterwiki . ':';
1111                 }
1112
1113                 if ( 0 != $this->mNamespace ) {
1114                         $p .= $this->getNsText() . ':';
1115                 }
1116                 return $p . $name;
1117         }
1118
1119         /**
1120          * Get the prefixed database key form
1121          *
1122          * @return String the prefixed title, with underscores and
1123          *  any interwiki and namespace prefixes
1124          */
1125         public function getPrefixedDBkey() {
1126                 $s = $this->prefix( $this->mDbkeyform );
1127                 $s = str_replace( ' ', '_', $s );
1128                 return $s;
1129         }
1130
1131         /**
1132          * Get the prefixed title with spaces.
1133          * This is the form usually used for display
1134          *
1135          * @return String the prefixed title, with spaces
1136          */
1137         public function getPrefixedText() {
1138                 // @todo FIXME: Bad usage of empty() ?
1139                 if ( empty( $this->mPrefixedText ) ) {
1140                         $s = $this->prefix( $this->mTextform );
1141                         $s = str_replace( '_', ' ', $s );
1142                         $this->mPrefixedText = $s;
1143                 }
1144                 return $this->mPrefixedText;
1145         }
1146
1147         /**
1148          * Return a string representation of this title
1149          *
1150          * @return String representation of this title
1151          */
1152         public function __toString() {
1153                 return $this->getPrefixedText();
1154         }
1155
1156         /**
1157          * Get the prefixed title with spaces, plus any fragment
1158          * (part beginning with '#')
1159          *
1160          * @return String the prefixed title, with spaces and the fragment, including '#'
1161          */
1162         public function getFullText() {
1163                 $text = $this->getPrefixedText();
1164                 if ( $this->mFragment != '' ) {
1165                         $text .= '#' . $this->mFragment;
1166                 }
1167                 return $text;
1168         }
1169
1170         /**
1171          * Get the base page name, i.e. the leftmost part before any slashes
1172          *
1173          * @return String Base name
1174          */
1175         public function getBaseText() {
1176                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1177                         return $this->getText();
1178                 }
1179
1180                 $parts = explode( '/', $this->getText() );
1181                 # Don't discard the real title if there's no subpage involved
1182                 if ( count( $parts ) > 1 ) {
1183                         unset( $parts[count( $parts ) - 1] );
1184                 }
1185                 return implode( '/', $parts );
1186         }
1187
1188         /**
1189          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1190          *
1191          * @return String Subpage name
1192          */
1193         public function getSubpageText() {
1194                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1195                         return( $this->mTextform );
1196                 }
1197                 $parts = explode( '/', $this->mTextform );
1198                 return( $parts[count( $parts ) - 1] );
1199         }
1200
1201         /**
1202          * Get the HTML-escaped displayable text form.
1203          * Used for the title field in <a> tags.
1204          *
1205          * @return String the text, including any prefixes
1206          */
1207         public function getEscapedText() {
1208                 wfDeprecated( __METHOD__, '1.19' );
1209                 return htmlspecialchars( $this->getPrefixedText() );
1210         }
1211
1212         /**
1213          * Get a URL-encoded form of the subpage text
1214          *
1215          * @return String URL-encoded subpage name
1216          */
1217         public function getSubpageUrlForm() {
1218                 $text = $this->getSubpageText();
1219                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1220                 return( $text );
1221         }
1222
1223         /**
1224          * Get a URL-encoded title (not an actual URL) including interwiki
1225          *
1226          * @return String the URL-encoded form
1227          */
1228         public function getPrefixedURL() {
1229                 $s = $this->prefix( $this->mDbkeyform );
1230                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1231                 return $s;
1232         }
1233
1234         /**
1235          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1236          */
1237         private static function fixUrlQueryArgs( $query, $query2 ) {
1238                 if ( is_array( $query ) ) {
1239                         $query = wfArrayToCGI( $query );
1240                 }
1241                 if ( $query2 ) {
1242                         if ( is_string( $query2 ) ) {
1243                                 // $query2 is a string, we will consider this to be
1244                                 // a deprecated $variant argument and add it to the query
1245                                 $query2 = wfArrayToCGI( array( 'variant' => $query2 ) );
1246                         } else {
1247                                 $query2 = wfArrayToCGI( $query2 );
1248                         }
1249                         // If we have $query content add a & to it first
1250                         if ( $query ) {
1251                                 $query .= '&';
1252                         }
1253                         // Now append the queries together
1254                         $query .= $query2;
1255                 }
1256                 return $query;
1257         }
1258
1259         /**
1260          * Get a real URL referring to this title, with interwiki link and
1261          * fragment
1262          *
1263          * See getLocalURL for the arguments.
1264          *
1265          * @see self::getLocalURL
1266          * @return String the URL
1267          */
1268         public function getFullURL( $query = '', $query2 = false ) {
1269                 $query = self::fixUrlQueryArgs( $query, $query2 );
1270
1271                 # Hand off all the decisions on urls to getLocalURL
1272                 $url = $this->getLocalURL( $query );
1273
1274                 # Expand the url to make it a full url. Note that getLocalURL has the
1275                 # potential to output full urls for a variety of reasons, so we use
1276                 # wfExpandUrl instead of simply prepending $wgServer
1277                 $url = wfExpandUrl( $url, PROTO_RELATIVE );
1278
1279                 # Finally, add the fragment.
1280                 $url .= $this->getFragmentForURL();
1281
1282                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1283                 return $url;
1284         }
1285
1286         /**
1287          * Get a URL with no fragment or server name.  If this page is generated
1288          * with action=render, $wgServer is prepended.
1289          *
1290
1291          * @param $query \twotypes{\string,\array} an optional query string,
1292          *   not used for interwiki     links. Can be specified as an associative array as well,
1293          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1294          *   Some query patterns will trigger various shorturl path replacements.
1295          * @param $query2 Mixed: An optional secondary query array. This one MUST
1296          *   be an array. If a string is passed it will be interpreted as a deprecated
1297          *   variant argument and urlencoded into a variant= argument.
1298          *   This second query argument will be added to the $query
1299          * @return String the URL
1300          */
1301         public function getLocalURL( $query = '', $query2 = false ) {
1302                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1303
1304                 $query = self::fixUrlQueryArgs( $query, $query2 );
1305
1306                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1307                 if ( $interwiki ) {
1308                         $namespace = $this->getNsText();
1309                         if ( $namespace != '' ) {
1310                                 # Can this actually happen? Interwikis shouldn't be parsed.
1311                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1312                                 $namespace .= ':';
1313                         }
1314                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1315                         $url = wfAppendQuery( $url, $query );
1316                 } else {
1317                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1318                         if ( $query == '' ) {
1319                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1320                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1321                         } else {
1322                                 global $wgVariantArticlePath, $wgActionPaths;
1323                                 $url = false;
1324                                 $matches = array();
1325
1326                                 if ( !empty( $wgActionPaths ) &&
1327                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1328                                 {
1329                                         $action = urldecode( $matches[2] );
1330                                         if ( isset( $wgActionPaths[$action] ) ) {
1331                                                 $query = $matches[1];
1332                                                 if ( isset( $matches[4] ) ) {
1333                                                         $query .= $matches[4];
1334                                                 }
1335                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1336                                                 if ( $query != '' ) {
1337                                                         $url = wfAppendQuery( $url, $query );
1338                                                 }
1339                                         }
1340                                 }
1341
1342                                 if ( $url === false &&
1343                                         $wgVariantArticlePath &&
1344                                         $this->getPageLanguage()->hasVariants() &&
1345                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1346                                 {
1347                                         $variant = urldecode( $matches[1] );
1348                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1349                                                 // Only do the variant replacement if the given variant is a valid
1350                                                 // variant for the page's language.
1351                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1352                                                 $url = str_replace( '$1', $dbkey, $url );
1353                                         }
1354                                 }
1355
1356                                 if ( $url === false ) {
1357                                         if ( $query == '-' ) {
1358                                                 $query = '';
1359                                         }
1360                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1361                                 }
1362                         }
1363
1364                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1365
1366                         // @todo FIXME: This causes breakage in various places when we
1367                         // actually expected a local URL and end up with dupe prefixes.
1368                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1369                                 $url = $wgServer . $url;
1370                         }
1371                 }
1372                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1373                 return $url;
1374         }
1375
1376         /**
1377          * Get a URL that's the simplest URL that will be valid to link, locally,
1378          * to the current Title.  It includes the fragment, but does not include
1379          * the server unless action=render is used (or the link is external).  If
1380          * there's a fragment but the prefixed text is empty, we just return a link
1381          * to the fragment.
1382          *
1383          * The result obviously should not be URL-escaped, but does need to be
1384          * HTML-escaped if it's being output in HTML.
1385          *
1386          * See getLocalURL for the arguments.
1387          *
1388          * @see self::getLocalURL
1389          * @return String the URL
1390          */
1391         public function getLinkURL( $query = '', $query2 = false ) {
1392                 wfProfileIn( __METHOD__ );
1393                 if ( $this->isExternal() ) {
1394                         $ret = $this->getFullURL( $query, $query2 );
1395                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1396                         $ret = $this->getFragmentForURL();
1397                 } else {
1398                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1399                 }
1400                 wfProfileOut( __METHOD__ );
1401                 return $ret;
1402         }
1403
1404         /**
1405          * Get an HTML-escaped version of the URL form, suitable for
1406          * using in a link, without a server name or fragment
1407          *
1408          * See getLocalURL for the arguments.
1409          *
1410          * @see self::getLocalURL
1411          * @return String the URL
1412          */
1413         public function escapeLocalURL( $query = '', $query2 = false ) {
1414                 wfDeprecated( __METHOD__, '1.19' );
1415                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1416         }
1417
1418         /**
1419          * Get an HTML-escaped version of the URL form, suitable for
1420          * using in a link, including the server name and fragment
1421          *
1422          * See getLocalURL for the arguments.
1423          *
1424          * @see self::getLocalURL
1425          * @return String the URL
1426          */
1427         public function escapeFullURL( $query = '', $query2 = false ) {
1428                 wfDeprecated( __METHOD__, '1.19' );
1429                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1430         }
1431
1432         /**
1433          * Get the URL form for an internal link.
1434          * - Used in various Squid-related code, in case we have a different
1435          * internal hostname for the server from the exposed one.
1436          *
1437          * This uses $wgInternalServer to qualify the path, or $wgServer
1438          * if $wgInternalServer is not set. If the server variable used is
1439          * protocol-relative, the URL will be expanded to http://
1440          *
1441          * See getLocalURL for the arguments.
1442          *
1443          * @see self::getLocalURL
1444          * @return String the URL
1445          */
1446         public function getInternalURL( $query = '', $query2 = false ) {
1447                 global $wgInternalServer, $wgServer;
1448                 $query = self::fixUrlQueryArgs( $query, $query2 );
1449                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1450                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1451                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1452                 return $url;
1453         }
1454
1455         /**
1456          * Get the URL for a canonical link, for use in things like IRC and
1457          * e-mail notifications. Uses $wgCanonicalServer and the
1458          * GetCanonicalURL hook.
1459          *
1460          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1461          *
1462          * See getLocalURL for the arguments.
1463          *
1464          * @see self::getLocalURL
1465          * @return string The URL
1466          * @since 1.18
1467          */
1468         public function getCanonicalURL( $query = '', $query2 = false ) {
1469                 $query = self::fixUrlQueryArgs( $query, $query2 );
1470                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1471                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1472                 return $url;
1473         }
1474
1475         /**
1476          * HTML-escaped version of getCanonicalURL()
1477          *
1478          * See getLocalURL for the arguments.
1479          *
1480          * @see self::getLocalURL
1481          * @since 1.18
1482          */
1483         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1484                 wfDeprecated( __METHOD__, '1.19' );
1485                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1486         }
1487
1488         /**
1489          * Get the edit URL for this Title
1490          *
1491          * @return String the URL, or a null string if this is an
1492          *  interwiki link
1493          */
1494         public function getEditURL() {
1495                 if ( $this->mInterwiki != '' ) {
1496                         return '';
1497                 }
1498                 $s = $this->getLocalURL( 'action=edit' );
1499
1500                 return $s;
1501         }
1502
1503         /**
1504          * Is $wgUser watching this page?
1505          *
1506          * @return Bool
1507          */
1508         public function userIsWatching() {
1509                 global $wgUser;
1510
1511                 if ( is_null( $this->mWatched ) ) {
1512                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1513                                 $this->mWatched = false;
1514                         } else {
1515                                 $this->mWatched = $wgUser->isWatched( $this );
1516                         }
1517                 }
1518                 return $this->mWatched;
1519         }
1520
1521         /**
1522          * Can $wgUser read this page?
1523          *
1524          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1525          * @return Bool
1526          * @todo fold these checks into userCan()
1527          */
1528         public function userCanRead() {
1529                 wfDeprecated( __METHOD__, '1.19' );
1530                 return $this->userCan( 'read' );
1531         }
1532
1533         /**
1534          * Can $user perform $action on this page?
1535          * This skips potentially expensive cascading permission checks
1536          * as well as avoids expensive error formatting
1537          *
1538          * Suitable for use for nonessential UI controls in common cases, but
1539          * _not_ for functional access control.
1540          *
1541          * May provide false positives, but should never provide a false negative.
1542          *
1543          * @param $action String action that permission needs to be checked for
1544          * @param $user User to check (since 1.19); $wgUser will be used if not
1545          *              provided.
1546          * @return Bool
1547          */
1548         public function quickUserCan( $action, $user = null ) {
1549                 return $this->userCan( $action, $user, false );
1550         }
1551
1552         /**
1553          * Can $user perform $action on this page?
1554          *
1555          * @param $action String action that permission needs to be checked for
1556          * @param $user User to check (since 1.19); $wgUser will be used if not
1557          *   provided.
1558          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1559          *   unnecessary queries.
1560          * @return Bool
1561          */
1562         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1563                 if ( !$user instanceof User ) {
1564                         global $wgUser;
1565                         $user = $wgUser;
1566                 }
1567                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1568         }
1569
1570         /**
1571          * Can $user perform $action on this page?
1572          *
1573          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1574          *
1575          * @param $action String action that permission needs to be checked for
1576          * @param $user User to check
1577          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1578          *   queries by skipping checks for cascading protections and user blocks.
1579          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1580          *   whose corresponding errors may be ignored.
1581          * @return Array of arguments to wfMsg to explain permissions problems.
1582          */
1583         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1584                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1585
1586                 // Remove the errors being ignored.
1587                 foreach ( $errors as $index => $error ) {
1588                         $error_key = is_array( $error ) ? $error[0] : $error;
1589
1590                         if ( in_array( $error_key, $ignoreErrors ) ) {
1591                                 unset( $errors[$index] );
1592                         }
1593                 }
1594
1595                 return $errors;
1596         }
1597
1598         /**
1599          * Permissions checks that fail most often, and which are easiest to test.
1600          *
1601          * @param $action String the action to check
1602          * @param $user User user to check
1603          * @param $errors Array list of current errors
1604          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1605          * @param $short Boolean short circuit on first error
1606          *
1607          * @return Array list of errors
1608          */
1609         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1610                 if ( $action == 'create' ) {
1611                         if ( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1612                                  ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1613                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1614                         }
1615                 } elseif ( $action == 'move' ) {
1616                         if ( !$user->isAllowed( 'move-rootuserpages' )
1617                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1618                                 // Show user page-specific message only if the user can move other pages
1619                                 $errors[] = array( 'cant-move-user-page' );
1620                         }
1621
1622                         // Check if user is allowed to move files if it's a file
1623                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1624                                 $errors[] = array( 'movenotallowedfile' );
1625                         }
1626
1627                         if ( !$user->isAllowed( 'move' ) ) {
1628                                 // User can't move anything
1629                                 global $wgGroupPermissions;
1630                                 $userCanMove = false;
1631                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1632                                         $userCanMove = $wgGroupPermissions['user']['move'];
1633                                 }
1634                                 $autoconfirmedCanMove = false;
1635                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1636                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1637                                 }
1638                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1639                                         // custom message if logged-in users without any special rights can move
1640                                         $errors[] = array( 'movenologintext' );
1641                                 } else {
1642                                         $errors[] = array( 'movenotallowed' );
1643                                 }
1644                         }
1645                 } elseif ( $action == 'move-target' ) {
1646                         if ( !$user->isAllowed( 'move' ) ) {
1647                                 // User can't move anything
1648                                 $errors[] = array( 'movenotallowed' );
1649                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1650                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1651                                 // Show user page-specific message only if the user can move other pages
1652                                 $errors[] = array( 'cant-move-to-user-page' );
1653                         }
1654                 } elseif ( !$user->isAllowed( $action ) ) {
1655                         $errors[] = $this->missingPermissionError( $action, $short );
1656                 }
1657
1658                 return $errors;
1659         }
1660
1661         /**
1662          * Add the resulting error code to the errors array
1663          *
1664          * @param $errors Array list of current errors
1665          * @param $result Mixed result of errors
1666          *
1667          * @return Array list of errors
1668          */
1669         private function resultToError( $errors, $result ) {
1670                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1671                         // A single array representing an error
1672                         $errors[] = $result;
1673                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1674                         // A nested array representing multiple errors
1675                         $errors = array_merge( $errors, $result );
1676                 } elseif ( $result !== '' && is_string( $result ) ) {
1677                         // A string representing a message-id
1678                         $errors[] = array( $result );
1679                 } elseif ( $result === false ) {
1680                         // a generic "We don't want them to do that"
1681                         $errors[] = array( 'badaccess-group0' );
1682                 }
1683                 return $errors;
1684         }
1685
1686         /**
1687          * Check various permission hooks
1688          *
1689          * @param $action String the action to check
1690          * @param $user User user to check
1691          * @param $errors Array list of current errors
1692          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1693          * @param $short Boolean short circuit on first error
1694          *
1695          * @return Array list of errors
1696          */
1697         private function checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1698                 // Use getUserPermissionsErrors instead
1699                 $result = '';
1700                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1701                         return $result ? array() : array( array( 'badaccess-group0' ) );
1702                 }
1703                 // Check getUserPermissionsErrors hook
1704                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1705                         $errors = $this->resultToError( $errors, $result );
1706                 }
1707                 // Check getUserPermissionsErrorsExpensive hook
1708                 if ( $doExpensiveQueries && !( $short && count( $errors ) > 0 ) &&
1709                          !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1710                         $errors = $this->resultToError( $errors, $result );
1711                 }
1712
1713                 return $errors;
1714         }
1715
1716         /**
1717          * Check permissions on special pages & namespaces
1718          *
1719          * @param $action String the action to check
1720          * @param $user User user to check
1721          * @param $errors Array list of current errors
1722          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1723          * @param $short Boolean short circuit on first error
1724          *
1725          * @return Array list of errors
1726          */
1727         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1728                 # Only 'createaccount' and 'execute' can be performed on
1729                 # special pages, which don't actually exist in the DB.
1730                 $specialOKActions = array( 'createaccount', 'execute', 'read' );
1731                 if ( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions ) ) {
1732                         $errors[] = array( 'ns-specialprotected' );
1733                 }
1734
1735                 # Check $wgNamespaceProtection for restricted namespaces
1736                 if ( $this->isNamespaceProtected( $user ) ) {
1737                         $ns = $this->mNamespace == NS_MAIN ?
1738                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1739                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1740                                 array( 'protectedinterface' ) : array( 'namespaceprotected',  $ns );
1741                 }
1742
1743                 return $errors;
1744         }
1745
1746         /**
1747          * Check CSS/JS sub-page permissions
1748          *
1749          * @param $action String the action to check
1750          * @param $user User user to check
1751          * @param $errors Array list of current errors
1752          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1753          * @param $short Boolean short circuit on first error
1754          *
1755          * @return Array list of errors
1756          */
1757         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1758                 # Protect css/js subpages of user pages
1759                 # XXX: this might be better using restrictions
1760                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1761                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1762                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1763                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1764                                 $errors[] = array( 'customcssprotected' );
1765                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1766                                 $errors[] = array( 'customjsprotected' );
1767                         }
1768                 }
1769
1770                 return $errors;
1771         }
1772
1773         /**
1774          * Check against page_restrictions table requirements on this
1775          * page. The user must possess all required rights for this
1776          * action.
1777          *
1778          * @param $action String the action to check
1779          * @param $user User user to check
1780          * @param $errors Array list of current errors
1781          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1782          * @param $short Boolean short circuit on first error
1783          *
1784          * @return Array list of errors
1785          */
1786         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1787                 foreach ( $this->getRestrictions( $action ) as $right ) {
1788                         // Backwards compatibility, rewrite sysop -> protect
1789                         if ( $right == 'sysop' ) {
1790                                 $right = 'protect';
1791                         }
1792                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1793                                 // Users with 'editprotected' permission can edit protected pages
1794                                 // without cascading option turned on.
1795                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1796                                         || $this->mCascadeRestriction )
1797                                 {
1798                                         $errors[] = array( 'protectedpagetext', $right );
1799                                 }
1800                         }
1801                 }
1802
1803                 return $errors;
1804         }
1805
1806         /**
1807          * Check restrictions on cascading pages.
1808          *
1809          * @param $action String the action to check
1810          * @param $user User to check
1811          * @param $errors Array list of current errors
1812          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1813          * @param $short Boolean short circuit on first error
1814          *
1815          * @return Array list of errors
1816          */
1817         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1818                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1819                         # We /could/ use the protection level on the source page, but it's
1820                         # fairly ugly as we have to establish a precedence hierarchy for pages
1821                         # included by multiple cascade-protected pages. So just restrict
1822                         # it to people with 'protect' permission, as they could remove the
1823                         # protection anyway.
1824                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1825                         # Cascading protection depends on more than this page...
1826                         # Several cascading protected pages may include this page...
1827                         # Check each cascading level
1828                         # This is only for protection restrictions, not for all actions
1829                         if ( isset( $restrictions[$action] ) ) {
1830                                 foreach ( $restrictions[$action] as $right ) {
1831                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1832                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1833                                                 $pages = '';
1834                                                 foreach ( $cascadingSources as $page )
1835                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1836                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1837                                         }
1838                                 }
1839                         }
1840                 }
1841
1842                 return $errors;
1843         }
1844
1845         /**
1846          * Check action permissions not already checked in checkQuickPermissions
1847          *
1848          * @param $action String the action to check
1849          * @param $user User to check
1850          * @param $errors Array list of current errors
1851          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1852          * @param $short Boolean short circuit on first error
1853          *
1854          * @return Array list of errors
1855          */
1856         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1857                 if ( $action == 'protect' ) {
1858                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1859                                 // If they can't edit, they shouldn't protect.
1860                                 $errors[] = array( 'protect-cantedit' );
1861                         }
1862                 } elseif ( $action == 'create' ) {
1863                         $title_protection = $this->getTitleProtection();
1864                         if( $title_protection ) {
1865                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1866                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1867                                 }
1868                                 if( $title_protection['pt_create_perm'] == '' ||
1869                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1870                                 {
1871                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1872                                 }
1873                         }
1874                 } elseif ( $action == 'move' ) {
1875                         // Check for immobile pages
1876                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1877                                 // Specific message for this case
1878                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1879                         } elseif ( !$this->isMovable() ) {
1880                                 // Less specific message for rarer cases
1881                                 $errors[] = array( 'immobile-source-page' );
1882                         }
1883                 } elseif ( $action == 'move-target' ) {
1884                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1885                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1886                         } elseif ( !$this->isMovable() ) {
1887                                 $errors[] = array( 'immobile-target-page' );
1888                         }
1889                 }
1890                 return $errors;
1891         }
1892
1893         /**
1894          * Check that the user isn't blocked from editting.
1895          *
1896          * @param $action String the action to check
1897          * @param $user User to check
1898          * @param $errors Array list of current errors
1899          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1900          * @param $short Boolean short circuit on first error
1901          *
1902          * @return Array list of errors
1903          */
1904         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
1905                 // Account creation blocks handled at userlogin.
1906                 // Unblocking handled in SpecialUnblock
1907                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
1908                         return $errors;
1909                 }
1910
1911                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
1912
1913                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1914                         $errors[] = array( 'confirmedittext' );
1915                 }
1916
1917                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
1918                         // Don't block the user from editing their own talk page unless they've been
1919                         // explicitly blocked from that too.
1920                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
1921                         $block = $user->mBlock;
1922
1923                         // This is from OutputPage::blockedPage
1924                         // Copied at r23888 by werdna
1925
1926                         $id = $user->blockedBy();
1927                         $reason = $user->blockedFor();
1928                         if ( $reason == '' ) {
1929                                 $reason = wfMsg( 'blockednoreason' );
1930                         }
1931                         $ip = $user->getRequest()->getIP();
1932
1933                         if ( is_numeric( $id ) ) {
1934                                 $name = User::whoIs( $id );
1935                         } else {
1936                                 $name = $id;
1937                         }
1938
1939                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1940                         $blockid = $block->getId();
1941                         $blockExpiry = $user->mBlock->mExpiry;
1942                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1943                         if ( $blockExpiry == 'infinity' ) {
1944                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
1945                         } else {
1946                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1947                         }
1948
1949                         $intended = strval( $user->mBlock->getTarget() );
1950
1951                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
1952                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1953                 }
1954
1955                 return $errors;
1956         }
1957
1958         /**
1959          * Check that the user is allowed to read this page.
1960          *
1961          * @param $action String the action to check
1962          * @param $user User to check
1963          * @param $errors Array list of current errors
1964          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1965          * @param $short Boolean short circuit on first error
1966          *
1967          * @return Array list of errors
1968          */
1969         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1970                 static $useShortcut = null;
1971
1972                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1973                 if ( is_null( $useShortcut ) ) {
1974                         global $wgGroupPermissions, $wgRevokePermissions;
1975                         $useShortcut = true;
1976                         if ( empty( $wgGroupPermissions['*']['read'] ) ) {
1977                                 # Not a public wiki, so no shortcut
1978                                 $useShortcut = false;
1979                         } elseif ( !empty( $wgRevokePermissions ) ) {
1980                                 /**
1981                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1982                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1983                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1984                                  * reading is allowed.
1985                                  */
1986                                 foreach ( $wgRevokePermissions as $perms ) {
1987                                         if ( !empty( $perms['read'] ) ) {
1988                                                 # We might be removing the read right from the user, so no shortcut
1989                                                 $useShortcut = false;
1990                                                 break;
1991                                         }
1992                                 }
1993                         }
1994                 }
1995
1996                 # Shortcut for public wikis, allows skipping quite a bit of code
1997                 if ( $useShortcut ) {
1998                         return $errors;
1999                 }
2000
2001                 # If the user is allowed to read pages, he is allowed to read all pages
2002                 if ( $user->isAllowed( 'read' ) ) {
2003                         return $errors;
2004                 }
2005
2006                 # Always grant access to the login page.
2007                 # Even anons need to be able to log in.
2008                 if ( $this->isSpecial( 'Userlogin' )
2009                         || $this->isSpecial( 'ChangePassword' )
2010                         || $this->isSpecial( 'PasswordReset' )
2011                 ) {
2012                         return $errors;
2013                 }
2014
2015                 # Time to check the whitelist
2016                 global $wgWhitelistRead;
2017
2018                 # Only to these checks is there's something to check against
2019                 if ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2020                         # Check for explicit whitelisting
2021                         $name = $this->getPrefixedText();
2022                         $dbName = $this->getPrefixedDBKey();
2023
2024                         // Check with and without underscores
2025                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2026                                 return $errors;
2027                         }
2028
2029                         # Old settings might have the title prefixed with
2030                         # a colon for main-namespace pages
2031                         if ( $this->getNamespace() == NS_MAIN ) {
2032                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2033                                         return $errors;
2034                                 }
2035                         }
2036
2037                         # If it's a special page, ditch the subpage bit and check again
2038                         if ( $this->isSpecialPage() ) {
2039                                 $name = $this->getDBkey();
2040                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2041                                 if ( $name !== false ) {
2042                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2043                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2044                                                 return $errors;
2045                                         }
2046                                 }
2047                         }
2048                 }
2049
2050                 $errors[] = $this->missingPermissionError( $action, $short );
2051                 return $errors;
2052         }
2053
2054         /**
2055          * Get a description array when the user doesn't have the right to perform
2056          * $action (i.e. when User::isAllowed() returns false)
2057          *
2058          * @param $action String the action to check
2059          * @param $short Boolean short circuit on first error
2060          * @return Array list of errors
2061          */
2062         private function missingPermissionError( $action, $short ) {
2063                 // We avoid expensive display logic for quickUserCan's and such
2064                 if ( $short ) {
2065                         return array( 'badaccess-group0' );
2066                 }
2067
2068                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2069                         User::getGroupsWithPermission( $action ) );
2070
2071                 if ( count( $groups ) ) {
2072                         global $wgLang;
2073                         return array(
2074                                 'badaccess-groups',
2075                                 $wgLang->commaList( $groups ),
2076                                 count( $groups )
2077                         );
2078                 } else {
2079                         return array( 'badaccess-group0' );
2080                 }
2081         }
2082
2083         /**
2084          * Can $user perform $action on this page? This is an internal function,
2085          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2086          * checks on wfReadOnly() and blocks)
2087          *
2088          * @param $action String action that permission needs to be checked for
2089          * @param $user User to check
2090          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2091          * @param $short Bool Set this to true to stop after the first permission error.
2092          * @return Array of arrays of the arguments to wfMsg to explain permissions problems.
2093          */
2094         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2095                 wfProfileIn( __METHOD__ );
2096
2097                 # Read has special handling
2098                 if ( $action == 'read' ) {
2099                         $checks = array(
2100                                 'checkPermissionHooks',
2101                                 'checkReadPermissions',
2102                         );
2103                 } else {
2104                         $checks = array(
2105                                 'checkQuickPermissions',
2106                                 'checkPermissionHooks',
2107                                 'checkSpecialsAndNSPermissions',
2108                                 'checkCSSandJSPermissions',
2109                                 'checkPageRestrictions',
2110                                 'checkCascadingSourcesRestrictions',
2111                                 'checkActionPermissions',
2112                                 'checkUserBlock'
2113                         );
2114                 }
2115
2116                 $errors = array();
2117                 while( count( $checks ) > 0 &&
2118                                 !( $short && count( $errors ) > 0 ) ) {
2119                         $method = array_shift( $checks );
2120                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2121                 }
2122
2123                 wfProfileOut( __METHOD__ );
2124                 return $errors;
2125         }
2126
2127         /**
2128          * Protect css subpages of user pages: can $wgUser edit
2129          * this page?
2130          *
2131          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2132          * @return Bool
2133          */
2134         public function userCanEditCssSubpage() {
2135                 global $wgUser;
2136                 wfDeprecated( __METHOD__, '1.19' );
2137                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2138                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2139         }
2140
2141         /**
2142          * Protect js subpages of user pages: can $wgUser edit
2143          * this page?
2144          *
2145          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2146          * @return Bool
2147          */
2148         public function userCanEditJsSubpage() {
2149                 global $wgUser;
2150                 wfDeprecated( __METHOD__, '1.19' );
2151                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2152                            || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2153         }
2154
2155         /**
2156          * Get a filtered list of all restriction types supported by this wiki.
2157          * @param bool $exists True to get all restriction types that apply to
2158          * titles that do exist, False for all restriction types that apply to
2159          * titles that do not exist
2160          * @return array
2161          */
2162         public static function getFilteredRestrictionTypes( $exists = true ) {
2163                 global $wgRestrictionTypes;
2164                 $types = $wgRestrictionTypes;
2165                 if ( $exists ) {
2166                         # Remove the create restriction for existing titles
2167                         $types = array_diff( $types, array( 'create' ) );
2168                 } else {
2169                         # Only the create and upload restrictions apply to non-existing titles
2170                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2171                 }
2172                 return $types;
2173         }
2174
2175         /**
2176          * Returns restriction types for the current Title
2177          *
2178          * @return array applicable restriction types
2179          */
2180         public function getRestrictionTypes() {
2181                 if ( $this->isSpecialPage() ) {
2182                         return array();
2183                 }
2184
2185                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2186
2187                 if ( $this->getNamespace() != NS_FILE ) {
2188                         # Remove the upload restriction for non-file titles
2189                         $types = array_diff( $types, array( 'upload' ) );
2190                 }
2191
2192                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2193
2194                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2195                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2196
2197                 return $types;
2198         }
2199
2200         /**
2201          * Is this title subject to title protection?
2202          * Title protection is the one applied against creation of such title.
2203          *
2204          * @return Mixed An associative array representing any existent title
2205          *   protection, or false if there's none.
2206          */
2207         private function getTitleProtection() {
2208                 // Can't protect pages in special namespaces
2209                 if ( $this->getNamespace() < 0 ) {
2210                         return false;
2211                 }
2212
2213                 // Can't protect pages that exist.
2214                 if ( $this->exists() ) {
2215                         return false;
2216                 }
2217
2218                 if ( !isset( $this->mTitleProtection ) ) {
2219                         $dbr = wfGetDB( DB_SLAVE );
2220                         $res = $dbr->select( 'protected_titles', '*',
2221                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2222                                 __METHOD__ );
2223
2224                         // fetchRow returns false if there are no rows.
2225                         $this->mTitleProtection = $dbr->fetchRow( $res );
2226                 }
2227                 return $this->mTitleProtection;
2228         }
2229
2230         /**
2231          * Update the title protection status
2232          *
2233          * @param $create_perm String Permission required for creation
2234          * @param $reason String Reason for protection
2235          * @param $expiry String Expiry timestamp
2236          * @return boolean true
2237          */
2238         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2239                 global $wgUser, $wgContLang;
2240
2241                 if ( $create_perm == implode( ',', $this->getRestrictions( 'create' ) )
2242                         && $expiry == $this->mRestrictionsExpiry['create'] ) {
2243                         // No change
2244                         return true;
2245                 }
2246
2247                 list ( $namespace, $title ) = array( $this->getNamespace(), $this->getDBkey() );
2248
2249                 $dbw = wfGetDB( DB_MASTER );
2250
2251                 $encodedExpiry = $dbw->encodeExpiry( $expiry );
2252
2253                 $expiry_description = '';
2254                 if ( $encodedExpiry != $dbw->getInfinity() ) {
2255                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ),
2256                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ) . ')';
2257                 } else {
2258                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ) . ')';
2259                 }
2260
2261                 # Update protection table
2262                 if ( $create_perm != '' ) {
2263                         $this->mTitleProtection = array(
2264                                         'pt_namespace' => $namespace,
2265                                         'pt_title' => $title,
2266                                         'pt_create_perm' => $create_perm,
2267                                         'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2268                                         'pt_expiry' => $encodedExpiry,
2269                                         'pt_user' => $wgUser->getId(),
2270                                         'pt_reason' => $reason,
2271                                 );
2272                         $dbw->replace( 'protected_titles', array( array( 'pt_namespace', 'pt_title' ) ),
2273                                 $this->mTitleProtection, __METHOD__     );
2274                 } else {
2275                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
2276                                 'pt_title' => $title ), __METHOD__ );
2277                         $this->mTitleProtection = false;
2278                 }
2279
2280                 # Update the protection log
2281                 if ( $dbw->affectedRows() ) {
2282                         $log = new LogPage( 'protect' );
2283
2284                         if ( $create_perm ) {
2285                                 $params = array( "[create=$create_perm] $expiry_description", '' );
2286                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
2287                         } else {
2288                                 $log->addEntry( 'unprotect', $this, $reason );
2289                         }
2290                 }
2291
2292                 return true;
2293         }
2294
2295         /**
2296          * Remove any title protection due to page existing
2297          */
2298         public function deleteTitleProtection() {
2299                 $dbw = wfGetDB( DB_MASTER );
2300
2301                 $dbw->delete(
2302                         'protected_titles',
2303                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2304                         __METHOD__
2305                 );
2306                 $this->mTitleProtection = false;
2307         }
2308
2309         /**
2310          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2311          *
2312          * @param $action String Action to check (default: edit)
2313          * @return Bool
2314          */
2315         public function isSemiProtected( $action = 'edit' ) {
2316                 if ( $this->exists() ) {
2317                         $restrictions = $this->getRestrictions( $action );
2318                         if ( count( $restrictions ) > 0 ) {
2319                                 foreach ( $restrictions as $restriction ) {
2320                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2321                                                 return false;
2322                                         }
2323                                 }
2324                         } else {
2325                                 # Not protected
2326                                 return false;
2327                         }
2328                         return true;
2329                 } else {
2330                         # If it doesn't exist, it can't be protected
2331                         return false;
2332                 }
2333         }
2334
2335         /**
2336          * Does the title correspond to a protected article?
2337          *
2338          * @param $action String the action the page is protected from,
2339          * by default checks all actions.
2340          * @return Bool
2341          */
2342         public function isProtected( $action = '' ) {
2343                 global $wgRestrictionLevels;
2344
2345                 $restrictionTypes = $this->getRestrictionTypes();
2346
2347                 # Special pages have inherent protection
2348                 if( $this->isSpecialPage() ) {
2349                         return true;
2350                 }
2351
2352                 # Check regular protection levels
2353                 foreach ( $restrictionTypes as $type ) {
2354                         if ( $action == $type || $action == '' ) {
2355                                 $r = $this->getRestrictions( $type );
2356                                 foreach ( $wgRestrictionLevels as $level ) {
2357                                         if ( in_array( $level, $r ) && $level != '' ) {
2358                                                 return true;
2359                                         }
2360                                 }
2361                         }
2362                 }
2363
2364                 return false;
2365         }
2366
2367         /**
2368          * Determines if $user is unable to edit this page because it has been protected
2369          * by $wgNamespaceProtection.
2370          *
2371          * @param $user User object to check permissions
2372          * @return Bool
2373          */
2374         public function isNamespaceProtected( User $user ) {
2375                 global $wgNamespaceProtection;
2376
2377                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2378                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2379                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2380                                         return true;
2381                                 }
2382                         }
2383                 }
2384                 return false;
2385         }
2386
2387         /**
2388          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2389          *
2390          * @return Bool If the page is subject to cascading restrictions.
2391          */
2392         public function isCascadeProtected() {
2393                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2394                 return ( $sources > 0 );
2395         }
2396
2397         /**
2398          * Cascading protection: Get the source of any cascading restrictions on this page.
2399          *
2400          * @param $getPages Bool Whether or not to retrieve the actual pages
2401          *        that the restrictions have come from.
2402          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2403          *     have come, false for none, or true if such restrictions exist, but $getPages
2404          *     was not set.  The restriction array is an array of each type, each of which
2405          *     contains a array of unique groups.
2406          */
2407         public function getCascadeProtectionSources( $getPages = true ) {
2408                 global $wgContLang;
2409                 $pagerestrictions = array();
2410
2411                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2412                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2413                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2414                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2415                 }
2416
2417                 wfProfileIn( __METHOD__ );
2418
2419                 $dbr = wfGetDB( DB_SLAVE );
2420
2421                 if ( $this->getNamespace() == NS_FILE ) {
2422                         $tables = array( 'imagelinks', 'page_restrictions' );
2423                         $where_clauses = array(
2424                                 'il_to' => $this->getDBkey(),
2425                                 'il_from=pr_page',
2426                                 'pr_cascade' => 1
2427                         );
2428                 } else {
2429                         $tables = array( 'templatelinks', 'page_restrictions' );
2430                         $where_clauses = array(
2431                                 'tl_namespace' => $this->getNamespace(),
2432                                 'tl_title' => $this->getDBkey(),
2433                                 'tl_from=pr_page',
2434                                 'pr_cascade' => 1
2435                         );
2436                 }
2437
2438                 if ( $getPages ) {
2439                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2440                                                    'pr_expiry', 'pr_type', 'pr_level' );
2441                         $where_clauses[] = 'page_id=pr_page';
2442                         $tables[] = 'page';
2443                 } else {
2444                         $cols = array( 'pr_expiry' );
2445                 }
2446
2447                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2448
2449                 $sources = $getPages ? array() : false;
2450                 $now = wfTimestampNow();
2451                 $purgeExpired = false;
2452
2453                 foreach ( $res as $row ) {
2454                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2455                         if ( $expiry > $now ) {
2456                                 if ( $getPages ) {
2457                                         $page_id = $row->pr_page;
2458                                         $page_ns = $row->page_namespace;
2459                                         $page_title = $row->page_title;
2460                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2461                                         # Add groups needed for each restriction type if its not already there
2462                                         # Make sure this restriction type still exists
2463
2464                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2465                                                 $pagerestrictions[$row->pr_type] = array();
2466                                         }
2467
2468                                         if ( isset( $pagerestrictions[$row->pr_type] ) &&
2469                                                  !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] ) ) {
2470                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2471                                         }
2472                                 } else {
2473                                         $sources = true;
2474                                 }
2475                         } else {
2476                                 // Trigger lazy purge of expired restrictions from the db
2477                                 $purgeExpired = true;
2478                         }
2479                 }
2480                 if ( $purgeExpired ) {
2481                         Title::purgeExpiredRestrictions();
2482                 }
2483
2484                 if ( $getPages ) {
2485                         $this->mCascadeSources = $sources;
2486                         $this->mCascadingRestrictions = $pagerestrictions;
2487                 } else {
2488                         $this->mHasCascadingRestrictions = $sources;
2489                 }
2490
2491                 wfProfileOut( __METHOD__ );
2492                 return array( $sources, $pagerestrictions );
2493         }
2494
2495         /**
2496          * Accessor/initialisation for mRestrictions
2497          *
2498          * @param $action String action that permission needs to be checked for
2499          * @return Array of Strings the array of groups allowed to edit this article
2500          */
2501         public function getRestrictions( $action ) {
2502                 if ( !$this->mRestrictionsLoaded ) {
2503                         $this->loadRestrictions();
2504                 }
2505                 return isset( $this->mRestrictions[$action] )
2506                                 ? $this->mRestrictions[$action]
2507                                 : array();
2508         }
2509
2510         /**
2511          * Get the expiry time for the restriction against a given action
2512          *
2513          * @return String|Bool 14-char timestamp, or 'infinity' if the page is protected forever
2514          *      or not protected at all, or false if the action is not recognised.
2515          */
2516         public function getRestrictionExpiry( $action ) {
2517                 if ( !$this->mRestrictionsLoaded ) {
2518                         $this->loadRestrictions();
2519                 }
2520                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2521         }
2522
2523         /**
2524          * Returns cascading restrictions for the current article
2525          *
2526          * @return Boolean
2527          */
2528         function areRestrictionsCascading() {
2529                 if ( !$this->mRestrictionsLoaded ) {
2530                         $this->loadRestrictions();
2531                 }
2532
2533                 return $this->mCascadeRestriction;
2534         }
2535
2536         /**
2537          * Loads a string into mRestrictions array
2538          *
2539          * @param $res Resource restrictions as an SQL result.
2540          * @param $oldFashionedRestrictions String comma-separated list of page
2541          *        restrictions from page table (pre 1.10)
2542          */
2543         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
2544                 $rows = array();
2545
2546                 foreach ( $res as $row ) {
2547                         $rows[] = $row;
2548                 }
2549
2550                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
2551         }
2552
2553         /**
2554          * Compiles list of active page restrictions from both page table (pre 1.10)
2555          * and page_restrictions table for this existing page.
2556          * Public for usage by LiquidThreads.
2557          *
2558          * @param $rows array of db result objects
2559          * @param $oldFashionedRestrictions string comma-separated list of page
2560          *        restrictions from page table (pre 1.10)
2561          */
2562         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
2563                 global $wgContLang;
2564                 $dbr = wfGetDB( DB_SLAVE );
2565
2566                 $restrictionTypes = $this->getRestrictionTypes();
2567
2568                 foreach ( $restrictionTypes as $type ) {
2569                         $this->mRestrictions[$type] = array();
2570                         $this->mRestrictionsExpiry[$type] = $wgContLang->formatExpiry( '', TS_MW );
2571                 }
2572
2573                 $this->mCascadeRestriction = false;
2574
2575                 # Backwards-compatibility: also load the restrictions from the page record (old format).
2576
2577                 if ( $oldFashionedRestrictions === null ) {
2578                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
2579                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
2580                 }
2581
2582                 if ( $oldFashionedRestrictions != '' ) {
2583
2584                         foreach ( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
2585                                 $temp = explode( '=', trim( $restrict ) );
2586                                 if ( count( $temp ) == 1 ) {
2587                                         // old old format should be treated as edit/move restriction
2588                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
2589                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
2590                                 } else {
2591                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
2592                                 }
2593                         }
2594
2595                         $this->mOldRestrictions = true;
2596
2597                 }
2598
2599                 if ( count( $rows ) ) {
2600                         # Current system - load second to make them override.
2601                         $now = wfTimestampNow();
2602                         $purgeExpired = false;
2603
2604                         # Cycle through all the restrictions.
2605                         foreach ( $rows as $row ) {
2606
2607                                 // Don't take care of restrictions types that aren't allowed
2608                                 if ( !in_array( $row->pr_type, $restrictionTypes ) )
2609                                         continue;
2610
2611                                 // This code should be refactored, now that it's being used more generally,
2612                                 // But I don't really see any harm in leaving it in Block for now -werdna
2613                                 $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2614
2615                                 // Only apply the restrictions if they haven't expired!
2616                                 if ( !$expiry || $expiry > $now ) {
2617                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
2618                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
2619
2620                                         $this->mCascadeRestriction |= $row->pr_cascade;
2621                                 } else {
2622                                         // Trigger a lazy purge of expired restrictions
2623                                         $purgeExpired = true;
2624                                 }
2625                         }
2626
2627                         if ( $purgeExpired ) {
2628                                 Title::purgeExpiredRestrictions();
2629                         }
2630                 }
2631
2632                 $this->mRestrictionsLoaded = true;
2633         }
2634
2635         /**
2636          * Load restrictions from the page_restrictions table
2637          *
2638          * @param $oldFashionedRestrictions String comma-separated list of page
2639          *        restrictions from page table (pre 1.10)
2640          */
2641         public function loadRestrictions( $oldFashionedRestrictions = null ) {
2642                 global $wgContLang;
2643                 if ( !$this->mRestrictionsLoaded ) {
2644                         if ( $this->exists() ) {
2645                                 $dbr = wfGetDB( DB_SLAVE );
2646
2647                                 $res = $dbr->select(
2648                                         'page_restrictions',
2649                                         '*',
2650                                         array( 'pr_page' => $this->getArticleId() ),
2651                                         __METHOD__
2652                                 );
2653
2654                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2655                         } else {
2656                                 $title_protection = $this->getTitleProtection();
2657
2658                                 if ( $title_protection ) {
2659                                         $now = wfTimestampNow();
2660                                         $expiry = $wgContLang->formatExpiry( $title_protection['pt_expiry'], TS_MW );
2661
2662                                         if ( !$expiry || $expiry > $now ) {
2663                                                 // Apply the restrictions
2664                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2665                                                 $this->mRestrictions['create'] = explode( ',', trim( $title_protection['pt_create_perm'] ) );
2666                                         } else { // Get rid of the old restrictions
2667                                                 Title::purgeExpiredRestrictions();
2668                                                 $this->mTitleProtection = false;
2669                                         }
2670                                 } else {
2671                                         $this->mRestrictionsExpiry['create'] = $wgContLang->formatExpiry( '', TS_MW );
2672                                 }
2673                                 $this->mRestrictionsLoaded = true;
2674                         }
2675                 }
2676         }
2677
2678         /**
2679          * Purge expired restrictions from the page_restrictions table
2680          */
2681         static function purgeExpiredRestrictions() {
2682                 $dbw = wfGetDB( DB_MASTER );
2683                 $dbw->delete(
2684                         'page_restrictions',
2685                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2686                         __METHOD__
2687                 );
2688
2689                 $dbw->delete(
2690                         'protected_titles',
2691                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2692                         __METHOD__
2693                 );
2694         }
2695
2696         /**
2697          * Does this have subpages?  (Warning, usually requires an extra DB query.)
2698          *
2699          * @return Bool
2700          */
2701         public function hasSubpages() {
2702                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
2703                         # Duh
2704                         return false;
2705                 }
2706
2707                 # We dynamically add a member variable for the purpose of this method
2708                 # alone to cache the result.  There's no point in having it hanging
2709                 # around uninitialized in every Title object; therefore we only add it
2710                 # if needed and don't declare it statically.
2711                 if ( isset( $this->mHasSubpages ) ) {
2712                         return $this->mHasSubpages;
2713                 }
2714
2715                 $subpages = $this->getSubpages( 1 );
2716                 if ( $subpages instanceof TitleArray ) {
2717                         return $this->mHasSubpages = (bool)$subpages->count();
2718                 }
2719                 return $this->mHasSubpages = false;
2720         }
2721
2722         /**
2723          * Get all subpages of this page.
2724          *
2725          * @param $limit Int maximum number of subpages to fetch; -1 for no limit
2726          * @return mixed TitleArray, or empty array if this page's namespace
2727          *  doesn't allow subpages
2728          */
2729         public function getSubpages( $limit = -1 ) {
2730                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
2731                         return array();
2732                 }
2733
2734                 $dbr = wfGetDB( DB_SLAVE );
2735                 $conds['page_namespace'] = $this->getNamespace();
2736                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
2737                 $options = array();
2738                 if ( $limit > -1 ) {
2739                         $options['LIMIT'] = $limit;
2740                 }
2741                 return $this->mSubpages = TitleArray::newFromResult(
2742                         $dbr->select( 'page',
2743                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
2744                                 $conds,
2745                                 __METHOD__,
2746                                 $options
2747                         )
2748                 );
2749         }
2750
2751         /**
2752          * Is there a version of this page in the deletion archive?
2753          *
2754          * @return Int the number of archived revisions
2755          */
2756         public function isDeleted() {
2757                 if ( $this->getNamespace() < 0 ) {
2758                         $n = 0;
2759                 } else {
2760                         $dbr = wfGetDB( DB_SLAVE );
2761
2762                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2763                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2764                                 __METHOD__
2765                         );
2766                         if ( $this->getNamespace() == NS_FILE ) {
2767                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2768                                         array( 'fa_name' => $this->getDBkey() ),
2769                                         __METHOD__
2770                                 );
2771                         }
2772                 }
2773                 return (int)$n;
2774         }
2775
2776         /**
2777          * Is there a version of this page in the deletion archive?
2778          *
2779          * @return Boolean
2780          */
2781         public function isDeletedQuick() {
2782                 if ( $this->getNamespace() < 0 ) {
2783                         return false;
2784                 }
2785                 $dbr = wfGetDB( DB_SLAVE );
2786                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2787                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2788                         __METHOD__
2789                 );
2790                 if ( !$deleted && $this->getNamespace() == NS_FILE ) {
2791                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2792                                 array( 'fa_name' => $this->getDBkey() ),
2793                                 __METHOD__
2794                         );
2795                 }
2796                 return $deleted;
2797         }
2798
2799         /**
2800          * Get the number of views of this page
2801          *
2802          * @return int The view count for the page
2803          */
2804         public function getCount() {
2805                 if ( $this->mCounter == -1 ) {
2806                         if ( $this->exists() ) {
2807                                 $dbr = wfGetDB( DB_SLAVE );
2808                                 $this->mCounter = $dbr->selectField( 'page',
2809                                         'page_counter',
2810                                         array( 'page_id' => $this->getArticleID() ),
2811                                         __METHOD__
2812                                 );
2813                         } else {
2814                                 $this->mCounter = 0;
2815                         }
2816                 }
2817
2818                 return $this->mCounter;
2819         }
2820
2821         /**
2822          * Get the article ID for this Title from the link cache,
2823          * adding it if necessary
2824          *
2825          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select
2826          *  for update
2827          * @return Int the ID
2828          */
2829         public function getArticleID( $flags = 0 ) {
2830                 if ( $this->getNamespace() < 0 ) {
2831                         return $this->mArticleID = 0;
2832                 }
2833                 $linkCache = LinkCache::singleton();
2834                 if ( $flags & self::GAID_FOR_UPDATE ) {
2835                         $oldUpdate = $linkCache->forUpdate( true );
2836                         $linkCache->clearLink( $this );
2837                         $this->mArticleID = $linkCache->addLinkObj( $this );
2838                         $linkCache->forUpdate( $oldUpdate );
2839                 } else {
2840                         if ( -1 == $this->mArticleID ) {
2841                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2842                         }
2843                 }
2844                 return $this->mArticleID;
2845         }
2846
2847         /**
2848          * Is this an article that is a redirect page?
2849          * Uses link cache, adding it if necessary
2850          *
2851          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2852          * @return Bool
2853          */
2854         public function isRedirect( $flags = 0 ) {
2855                 if ( !is_null( $this->mRedirect ) ) {
2856                         return $this->mRedirect;
2857                 }
2858                 # Calling getArticleID() loads the field from cache as needed
2859                 if ( !$this->getArticleID( $flags ) ) {
2860                         return $this->mRedirect = false;
2861                 }
2862                 $linkCache = LinkCache::singleton();
2863                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2864
2865                 return $this->mRedirect;
2866         }
2867
2868         /**
2869          * What is the length of this page?
2870          * Uses link cache, adding it if necessary
2871          *
2872          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2873          * @return Int
2874          */
2875         public function getLength( $flags = 0 ) {
2876                 if ( $this->mLength != -1 ) {
2877                         return $this->mLength;
2878                 }
2879                 # Calling getArticleID() loads the field from cache as needed
2880                 if ( !$this->getArticleID( $flags ) ) {
2881                         return $this->mLength = 0;
2882                 }
2883                 $linkCache = LinkCache::singleton();
2884                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2885
2886                 return $this->mLength;
2887         }
2888
2889         /**
2890          * What is the page_latest field for this page?
2891          *
2892          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2893          * @return Int or 0 if the page doesn't exist
2894          */
2895         public function getLatestRevID( $flags = 0 ) {
2896                 if ( $this->mLatestID !== false ) {
2897                         return intval( $this->mLatestID );
2898                 }
2899                 # Calling getArticleID() loads the field from cache as needed
2900                 if ( !$this->getArticleID( $flags ) ) {
2901                         return $this->mLatestID = 0;
2902                 }
2903                 $linkCache = LinkCache::singleton();
2904                 $this->mLatestID = intval( $linkCache->getGoodLinkFieldObj( $this, 'revision' ) );
2905
2906                 return $this->mLatestID;
2907         }
2908
2909         /**
2910          * This clears some fields in this object, and clears any associated
2911          * keys in the "bad links" section of the link cache.
2912          *
2913          * - This is called from Article::doEdit() and Article::insertOn() to allow
2914          * loading of the new page_id. It's also called from
2915          * Article::doDeleteArticle()
2916          *
2917          * @param $newid Int the new Article ID
2918          */
2919         public function resetArticleID( $newid ) {
2920                 $linkCache = LinkCache::singleton();
2921                 $linkCache->clearLink( $this );
2922
2923                 if ( $newid === false ) {
2924                         $this->mArticleID = -1;
2925                 } else {
2926                         $this->mArticleID = intval( $newid );
2927                 }
2928                 $this->mRestrictionsLoaded = false;
2929                 $this->mRestrictions = array();
2930                 $this->mRedirect = null;
2931                 $this->mLength = -1;
2932                 $this->mLatestID = false;
2933                 $this->mCounter = -1;
2934         }
2935
2936         /**
2937          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
2938          *
2939          * @param $text String containing title to capitalize
2940          * @param $ns int namespace index, defaults to NS_MAIN
2941          * @return String containing capitalized title
2942          */
2943         public static function capitalize( $text, $ns = NS_MAIN ) {
2944                 global $wgContLang;
2945
2946                 if ( MWNamespace::isCapitalized( $ns ) ) {
2947                         return $wgContLang->ucfirst( $text );
2948                 } else {
2949                         return $text;
2950                 }
2951         }
2952
2953         /**
2954          * Secure and split - main initialisation function for this object
2955          *
2956          * Assumes that mDbkeyform has been set, and is urldecoded
2957          * and uses underscores, but not otherwise munged.  This function
2958          * removes illegal characters, splits off the interwiki and
2959          * namespace prefixes, sets the other forms, and canonicalizes
2960          * everything.
2961          *
2962          * @return Bool true on success
2963          */
2964         private function secureAndSplit() {
2965                 global $wgContLang, $wgLocalInterwiki;
2966
2967                 # Initialisation
2968                 $this->mInterwiki = $this->mFragment = '';
2969                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2970
2971                 $dbkey = $this->mDbkeyform;
2972
2973                 # Strip Unicode bidi override characters.
2974                 # Sometimes they slip into cut-n-pasted page titles, where the
2975                 # override chars get included in list displays.
2976                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2977
2978                 # Clean up whitespace
2979                 # Note: use of the /u option on preg_replace here will cause
2980                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2981                 # conveniently disabling them.
2982                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2983                 $dbkey = trim( $dbkey, '_' );
2984
2985                 if ( $dbkey == '' ) {
2986                         return false;
2987                 }
2988
2989                 if ( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2990                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2991                         return false;
2992                 }
2993
2994                 $this->mDbkeyform = $dbkey;
2995
2996                 # Initial colon indicates main namespace rather than specified default
2997                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2998                 if ( ':' == $dbkey[0] ) {
2999                         $this->mNamespace = NS_MAIN;
3000                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
3001                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
3002                 }
3003
3004                 # Namespace or interwiki prefix
3005                 $firstPass = true;
3006                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
3007                 do {
3008                         $m = array();
3009                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
3010                                 $p = $m[1];
3011                                 if ( ( $ns = $wgContLang->getNsIndex( $p ) ) !== false ) {
3012                                         # Ordinary namespace
3013                                         $dbkey = $m[2];
3014                                         $this->mNamespace = $ns;
3015                                         # For Talk:X pages, check if X has a "namespace" prefix
3016                                         if ( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
3017                                                 if ( $wgContLang->getNsIndex( $x[1] ) ) {
3018                                                         # Disallow Talk:File:x type titles...
3019                                                         return false;
3020                                                 } elseif ( Interwiki::isValidInterwiki( $x[1] ) ) {
3021                                                         # Disallow Talk:Interwiki:x type titles...
3022                                                         return false;
3023                                                 }
3024                                         }
3025                                 } elseif ( Interwiki::isValidInterwiki( $p ) ) {
3026                                         if ( !$firstPass ) {
3027                                                 # Can't make a local interwiki link to an interwiki link.
3028                                                 # That's just crazy!
3029                                                 return false;
3030                                         }
3031
3032                                         # Interwiki link
3033                                         $dbkey = $m[2];
3034                                         $this->mInterwiki = $wgContLang->lc( $p );
3035
3036                                         # Redundant interwiki prefix to the local wiki
3037                                         if ( $wgLocalInterwiki !== false
3038                                                 && 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) )
3039                                         {
3040                                                 if ( $dbkey == '' ) {
3041                                                         # Can't have an empty self-link
3042                                                         return false;
3043                                                 }
3044                                                 $this->mInterwiki = '';
3045                                                 $firstPass = false;
3046                                                 # Do another namespace split...
3047                                                 continue;
3048                                         }
3049
3050                                         # If there's an initial colon after the interwiki, that also
3051                                         # resets the default namespace
3052                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
3053                                                 $this->mNamespace = NS_MAIN;
3054                                                 $dbkey = substr( $dbkey, 1 );
3055                                         }
3056                                 }
3057                                 # If there's no recognized interwiki or namespace,
3058                                 # then let the colon expression be part of the title.
3059                         }
3060                         break;
3061                 } while ( true );
3062
3063                 # We already know that some pages won't be in the database!
3064                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
3065                         $this->mArticleID = 0;
3066                 }
3067                 $fragment = strstr( $dbkey, '#' );
3068                 if ( false !== $fragment ) {
3069                         $this->setFragment( $fragment );
3070                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
3071                         # remove whitespace again: prevents "Foo_bar_#"
3072                         # becoming "Foo_bar_"
3073                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
3074                 }
3075
3076                 # Reject illegal characters.
3077                 $rxTc = self::getTitleInvalidRegex();
3078                 if ( preg_match( $rxTc, $dbkey ) ) {
3079                         return false;
3080                 }
3081
3082                 # Pages with "/./" or "/../" appearing in the URLs will often be un-
3083                 # reachable due to the way web browsers deal with 'relative' URLs.
3084                 # Also, they conflict with subpage syntax.  Forbid them explicitly.
3085                 if ( strpos( $dbkey, '.' ) !== false &&
3086                          ( $dbkey === '.' || $dbkey === '..' ||
3087                            strpos( $dbkey, './' ) === 0  ||
3088                            strpos( $dbkey, '../' ) === 0 ||
3089                            strpos( $dbkey, '/./' ) !== false ||
3090                            strpos( $dbkey, '/../' ) !== false  ||
3091                            substr( $dbkey, -2 ) == '/.' ||
3092                            substr( $dbkey, -3 ) == '/..' ) )
3093                 {
3094                         return false;
3095                 }
3096
3097                 # Magic tilde sequences? Nu-uh!
3098                 if ( strpos( $dbkey, '~~~' ) !== false ) {
3099                         return false;
3100                 }
3101
3102                 # Limit the size of titles to 255 bytes. This is typically the size of the
3103                 # underlying database field. We make an exception for special pages, which
3104                 # don't need to be stored in the database, and may edge over 255 bytes due
3105                 # to subpage syntax for long titles, e.g. [[Special:Block/Long name]]
3106                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
3107                   strlen( $dbkey ) > 512 )
3108                 {
3109                         return false;
3110                 }
3111
3112                 # Normally, all wiki links are forced to have an initial capital letter so [[foo]]
3113                 # and [[Foo]] point to the same place.  Don't force it for interwikis, since the
3114                 # other site might be case-sensitive.
3115                 $this->mUserCaseDBKey = $dbkey;
3116                 if ( $this->mInterwiki == '' ) {
3117                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
3118                 }
3119
3120                 # Can't make a link to a namespace alone... "empty" local links can only be
3121                 # self-links with a fragment identifier.
3122                 if ( $dbkey == '' && $this->mInterwiki == '' && $this->mNamespace != NS_MAIN ) {
3123                         return false;
3124                 }
3125
3126                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
3127                 // IP names are not allowed for accounts, and can only be referring to
3128                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
3129                 // there are numerous ways to present the same IP. Having sp:contribs scan
3130                 // them all is silly and having some show the edits and others not is
3131                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
3132                 $dbkey = ( $this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK )
3133                         ? IP::sanitizeIP( $dbkey )
3134                         : $dbkey;
3135
3136                 // Any remaining initial :s are illegal.
3137                 if ( $dbkey !== '' && ':' == $dbkey[0] ) {
3138                         return false;
3139                 }
3140
3141                 # Fill fields
3142                 $this->mDbkeyform = $dbkey;
3143                 $this->mUrlform = wfUrlencode( $dbkey );
3144
3145                 $this->mTextform = str_replace( '_', ' ', $dbkey );
3146
3147                 return true;
3148         }
3149
3150         /**
3151          * Get an array of Title objects linking to this Title
3152          * Also stores the IDs in the link cache.
3153          *
3154          * WARNING: do not use this function on arbitrary user-supplied titles!
3155          * On heavily-used templates it will max out the memory.
3156          *
3157          * @param $options Array: may be FOR UPDATE
3158          * @param $table String: table name
3159          * @param $prefix String: fields prefix
3160          * @return Array of Title objects linking here
3161          */
3162         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3163                 $linkCache = LinkCache::singleton();
3164
3165                 if ( count( $options ) > 0 ) {
3166                         $db = wfGetDB( DB_MASTER );
3167                 } else {
3168                         $db = wfGetDB( DB_SLAVE );
3169                 }
3170
3171                 $res = $db->select(
3172                         array( 'page', $table ),
3173                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3174                         array(
3175                                 "{$prefix}_from=page_id",
3176                                 "{$prefix}_namespace" => $this->getNamespace(),
3177                                 "{$prefix}_title"     => $this->getDBkey() ),
3178                         __METHOD__,
3179                         $options
3180                 );
3181
3182                 $retVal = array();
3183                 if ( $db->numRows( $res ) ) {
3184                         foreach ( $res as $row ) {
3185                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
3186                                 if ( $titleObj ) {
3187                                         $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3188                                         $retVal[] = $titleObj;
3189                                 }
3190                         }
3191                 }
3192                 return $retVal;
3193         }
3194
3195         /**
3196          * Get an array of Title objects using this Title as a template
3197          * Also stores the IDs in the link cache.
3198          *
3199          * WARNING: do not use this function on arbitrary user-supplied titles!
3200          * On heavily-used templates it will max out the memory.
3201          *
3202          * @param $options Array: may be FOR UPDATE
3203          * @return Array of Title the Title objects linking here
3204          */
3205         public function getTemplateLinksTo( $options = array() ) {
3206                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
3207         }
3208
3209         /**
3210          * Get an array of Title objects referring to non-existent articles linked from this page
3211          *
3212          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
3213          * @return Array of Title the Title objects
3214          */
3215         public function getBrokenLinksFrom() {
3216                 if ( $this->getArticleId() == 0 ) {
3217                         # All links from article ID 0 are false positives
3218                         return array();
3219                 }
3220
3221                 $dbr = wfGetDB( DB_SLAVE );
3222                 $res = $dbr->select(
3223                         array( 'page', 'pagelinks' ),
3224                         array( 'pl_namespace', 'pl_title' ),
3225                         array(
3226                                 'pl_from' => $this->getArticleId(),
3227                                 'page_namespace IS NULL'
3228                         ),
3229                         __METHOD__, array(),
3230                         array(
3231                                 'page' => array(
3232                                         'LEFT JOIN',
3233                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
3234                                 )
3235                         )
3236                 );
3237
3238                 $retVal = array();
3239                 foreach ( $res as $row ) {
3240                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
3241                 }
3242                 return $retVal;
3243         }
3244
3245
3246         /**
3247          * Get a list of URLs to purge from the Squid cache when this
3248          * page changes
3249          *
3250          * @return Array of String the URLs
3251          */
3252         public function getSquidURLs() {
3253                 global $wgContLang;
3254
3255                 $urls = array(
3256                         $this->getInternalURL(),
3257                         $this->getInternalURL( 'action=history' )
3258                 );
3259
3260                 // purge variant urls as well
3261                 if ( $wgContLang->hasVariants() ) {
3262                         $variants = $wgContLang->getVariants();
3263                         foreach ( $variants as $vCode ) {
3264                                 $urls[] = $this->getInternalURL( '', $vCode );
3265                         }
3266                 }
3267
3268                 return $urls;
3269         }
3270
3271         /**
3272          * Purge all applicable Squid URLs
3273          */
3274         public function purgeSquid() {
3275                 global $wgUseSquid;
3276                 if ( $wgUseSquid ) {
3277                         $urls = $this->getSquidURLs();
3278                         $u = new SquidUpdate( $urls );
3279                         $u->doUpdate();
3280                 }
3281         }
3282
3283         /**
3284          * Move this page without authentication
3285          *
3286          * @param $nt Title the new page Title
3287          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3288          */
3289         public function moveNoAuth( &$nt ) {
3290                 return $this->moveTo( $nt, false );
3291         }
3292
3293         /**
3294          * Check whether a given move operation would be valid.
3295          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
3296          *
3297          * @param $nt Title the new title
3298          * @param $auth Bool indicates whether $wgUser's permissions
3299          *  should be checked
3300          * @param $reason String is the log summary of the move, used for spam checking
3301          * @return Mixed True on success, getUserPermissionsErrors()-like array on failure
3302          */
3303         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
3304                 global $wgUser;
3305
3306                 $errors = array();
3307                 if ( !$nt ) {
3308                         // Normally we'd add this to $errors, but we'll get
3309                         // lots of syntax errors if $nt is not an object
3310                         return array( array( 'badtitletext' ) );
3311                 }
3312                 if ( $this->equals( $nt ) ) {
3313                         $errors[] = array( 'selfmove' );
3314                 }
3315                 if ( !$this->isMovable() ) {
3316                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
3317                 }
3318                 if ( $nt->getInterwiki() != '' ) {
3319                         $errors[] = array( 'immobile-target-namespace-iw' );
3320                 }
3321                 if ( !$nt->isMovable() ) {
3322                         $errors[] = array( 'immobile-target-namespace', $nt->getNsText() );
3323                 }
3324
3325                 $oldid = $this->getArticleID();
3326                 $newid = $nt->getArticleID();
3327
3328                 if ( strlen( $nt->getDBkey() ) < 1 ) {
3329                         $errors[] = array( 'articleexists' );
3330                 }
3331                 if ( ( $this->getDBkey() == '' ) ||
3332                          ( !$oldid ) ||
3333                          ( $nt->getDBkey() == '' ) ) {
3334                         $errors[] = array( 'badarticleerror' );
3335                 }
3336
3337                 // Image-specific checks
3338                 if ( $this->getNamespace() == NS_FILE ) {
3339                         $errors = array_merge( $errors, $this->validateFileMoveOperation( $nt ) );
3340                 }
3341
3342                 if ( $nt->getNamespace() == NS_FILE && $this->getNamespace() != NS_FILE ) {
3343                         $errors[] = array( 'nonfile-cannot-move-to-file' );
3344                 }
3345
3346                 if ( $auth ) {
3347                         $errors = wfMergeErrorArrays( $errors,
3348                                 $this->getUserPermissionsErrors( 'move', $wgUser ),
3349                                 $this->getUserPermissionsErrors( 'edit', $wgUser ),
3350                                 $nt->getUserPermissionsErrors( 'move-target', $wgUser ),
3351                                 $nt->getUserPermissionsErrors( 'edit', $wgUser ) );
3352                 }
3353
3354                 $match = EditPage::matchSummarySpamRegex( $reason );
3355                 if ( $match !== false ) {
3356                         // This is kind of lame, won't display nice
3357                         $errors[] = array( 'spamprotectiontext' );
3358                 }
3359
3360                 $err = null;
3361                 if ( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
3362                         $errors[] = array( 'hookaborted', $err );
3363                 }
3364
3365                 # The move is allowed only if (1) the target doesn't exist, or
3366                 # (2) the target is a redirect to the source, and has no history
3367                 # (so we can undo bad moves right after they're done).
3368
3369                 if ( 0 != $newid ) { # Target exists; check for validity
3370                         if ( !$this->isValidMoveTarget( $nt ) ) {
3371                                 $errors[] = array( 'articleexists' );
3372                         }
3373                 } else {
3374                         $tp = $nt->getTitleProtection();
3375                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
3376                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
3377                                 $errors[] = array( 'cantmove-titleprotected' );
3378                         }
3379                 }
3380                 if ( empty( $errors ) ) {
3381                         return true;
3382                 }
3383                 return $errors;
3384         }
3385
3386         /**
3387          * Check if the requested move target is a valid file move target
3388          * @param Title $nt Target title
3389          * @return array List of errors
3390          */
3391         protected function validateFileMoveOperation( $nt ) {
3392                 global $wgUser;
3393
3394                 $errors = array();
3395
3396                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is not allowed until below
3397
3398                 $file = wfLocalFile( $this );
3399                 if ( $file->exists() ) {
3400                         if ( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
3401                                 $errors[] = array( 'imageinvalidfilename' );
3402                         }
3403                         if ( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
3404                                 $errors[] = array( 'imagetypemismatch' );
3405                         }
3406                 }
3407
3408                 if ( $nt->getNamespace() != NS_FILE ) {
3409                         $errors[] = array( 'imagenocrossnamespace' );
3410                         // From here we want to do checks on a file object, so if we can't
3411                         // create one, we must return.
3412                         return $errors;
3413                 }
3414
3415                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is allowed below here
3416
3417                 $destFile = wfLocalFile( $nt );
3418                 if ( !$wgUser->isAllowed( 'reupload-shared' ) && !$destFile->exists() && wfFindFile( $nt ) ) {
3419                         $errors[] = array( 'file-exists-sharedrepo' );
3420                 }
3421
3422                 return $errors;
3423         }
3424
3425         /**
3426          * Move a title to a new location
3427          *
3428          * @param $nt Title the new title
3429          * @param $auth Bool indicates whether $wgUser's permissions
3430          *  should be checked
3431          * @param $reason String the reason for the move
3432          * @param $createRedirect Bool Whether to create a redirect from the old title to the new title.
3433          *  Ignored if the user doesn't have the suppressredirect right.
3434          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3435          */
3436         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
3437                 global $wgUser;
3438                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
3439                 if ( is_array( $err ) ) {
3440                         // Auto-block user's IP if the account was "hard" blocked
3441                         $wgUser->spreadAnyEditBlock();
3442                         return $err;
3443                 }
3444
3445                 // If it is a file, move it first.
3446                 // It is done before all other moving stuff is done because it's hard to revert.
3447                 $dbw = wfGetDB( DB_MASTER );
3448                 if ( $this->getNamespace() == NS_FILE ) {
3449                         $file = wfLocalFile( $this );
3450                         if ( $file->exists() ) {
3451                                 $status = $file->move( $nt );
3452                                 if ( !$status->isOk() ) {
3453                                         return $status->getErrorsArray();
3454                                 }
3455                         }
3456                 }
3457                 // Clear RepoGroup process cache
3458                 RepoGroup::singleton()->clearCache( $this );
3459                 RepoGroup::singleton()->clearCache( $nt ); # clear false negative cache
3460
3461                 $dbw->begin(); # If $file was a LocalFile, its transaction would have closed our own.
3462                 $pageid = $this->getArticleID( self::GAID_FOR_UPDATE );
3463                 $protected = $this->isProtected();
3464                 $pageCountChange = ( $createRedirect ? 1 : 0 ) - ( $nt->exists() ? 1 : 0 );
3465
3466                 // Do the actual move
3467                 $err = $this->moveToInternal( $nt, $reason, $createRedirect );
3468                 if ( is_array( $err ) ) {
3469                         # @todo FIXME: What about the File we have already moved?
3470                         $dbw->rollback();
3471                         return $err;
3472                 }
3473
3474                 $redirid = $this->getArticleID();
3475
3476                 // Refresh the sortkey for this row.  Be careful to avoid resetting
3477                 // cl_timestamp, which may disturb time-based lists on some sites.
3478                 $prefixes = $dbw->select(
3479                         'categorylinks',
3480                         array( 'cl_sortkey_prefix', 'cl_to' ),
3481                         array( 'cl_from' => $pageid ),
3482                         __METHOD__
3483                 );
3484                 foreach ( $prefixes as $prefixRow ) {
3485                         $prefix = $prefixRow->cl_sortkey_prefix;
3486                         $catTo = $prefixRow->cl_to;
3487                         $dbw->update( 'categorylinks',
3488                                 array(
3489                                         'cl_sortkey' => Collation::singleton()->getSortKey(
3490                                                 $nt->getCategorySortkey( $prefix ) ),
3491                                         'cl_timestamp=cl_timestamp' ),
3492                                 array(
3493                                         'cl_from' => $pageid,
3494                                         'cl_to' => $catTo ),
3495                                 __METHOD__
3496                         );
3497                 }
3498
3499                 if ( $protected ) {
3500                         # Protect the redirect title as the title used to be...
3501                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
3502                                 array(
3503                                         'pr_page'    => $redirid,
3504                                         'pr_type'    => 'pr_type',
3505                                         'pr_level'   => 'pr_level',
3506                                         'pr_cascade' => 'pr_cascade',
3507                                         'pr_user'    => 'pr_user',
3508                                         'pr_expiry'  => 'pr_expiry'
3509                                 ),
3510                                 array( 'pr_page' => $pageid ),
3511                                 __METHOD__,
3512                                 array( 'IGNORE' )
3513                         );
3514                         # Update the protection log
3515                         $log = new LogPage( 'protect' );
3516                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3517                         if ( $reason ) {
3518                                 $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3519                         }
3520                         // @todo FIXME: $params?
3521                         $log->addEntry( 'move_prot', $nt, $comment, array( $this->getPrefixedText() ) );
3522                 }
3523
3524                 # Update watchlists
3525                 $oldnamespace = $this->getNamespace() & ~1;
3526                 $newnamespace = $nt->getNamespace() & ~1;
3527                 $oldtitle = $this->getDBkey();
3528                 $newtitle = $nt->getDBkey();
3529
3530                 if ( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
3531                         WatchedItem::duplicateEntries( $this, $nt );
3532                 }
3533
3534                 # Update search engine
3535                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
3536                 $u->doUpdate();
3537                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
3538                 $u->doUpdate();
3539
3540                 $dbw->commit();
3541
3542                 # Update site_stats
3543                 if ( $this->isContentPage() && !$nt->isContentPage() ) {
3544                         # No longer a content page
3545                         # Not viewed, edited, removing
3546                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
3547                 } elseif ( !$this->isContentPage() && $nt->isContentPage() ) {
3548                         # Now a content page
3549                         # Not viewed, edited, adding
3550                         $u = new SiteStatsUpdate( 0, 1, + 1, $pageCountChange );
3551                 } elseif ( $pageCountChange ) {
3552                         # Redirect added
3553                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
3554                 } else {
3555                         # Nothing special
3556                         $u = false;
3557                 }
3558                 if ( $u ) {
3559                         $u->doUpdate();
3560                 }
3561
3562                 # Update message cache for interface messages
3563                 if ( $this->getNamespace() == NS_MEDIAWIKI ) {
3564                         # @bug 17860: old article can be deleted, if this the case,
3565                         # delete it from message cache
3566                         if ( $this->getArticleID() === 0 ) {
3567                                 MessageCache::singleton()->replace( $this->getDBkey(), false );
3568                         } else {
3569                                 $rev = Revision::newFromTitle( $this );
3570                                 MessageCache::singleton()->replace( $this->getDBkey(), $rev->getText() );
3571                         }
3572                 }
3573                 if ( $nt->getNamespace() == NS_MEDIAWIKI ) {
3574                         $rev = Revision::newFromTitle( $nt );
3575                         MessageCache::singleton()->replace( $nt->getDBkey(), $rev->getText() );
3576                 }
3577
3578                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
3579                 return true;
3580         }
3581
3582         /**
3583          * Move page to a title which is either a redirect to the
3584          * source page or nonexistent
3585          *
3586          * @param $nt Title the page to move to, which should be a redirect or nonexistent
3587          * @param $reason String The reason for the move
3588          * @param $createRedirect Bool Whether to leave a redirect at the old title.  Ignored
3589          *   if the user doesn't have the suppressredirect right
3590          */
3591         private function moveToInternal( &$nt, $reason = '', $createRedirect = true ) {
3592                 global $wgUser, $wgContLang;
3593
3594                 if ( $nt->exists() ) {
3595                         $moveOverRedirect = true;
3596                         $logType = 'move_redir';
3597                 } else {
3598                         $moveOverRedirect = false;
3599                         $logType = 'move';
3600                 }
3601
3602                 $redirectSuppressed = !$createRedirect && $wgUser->isAllowed( 'suppressredirect' );
3603
3604                 $logEntry = new ManualLogEntry( 'move', $logType );
3605                 $logEntry->setPerformer( $wgUser );
3606                 $logEntry->setTarget( $this );
3607                 $logEntry->setComment( $reason );
3608                 $logEntry->setParameters( array(
3609                         '4::target' => $nt->getPrefixedText(),
3610                         '5::noredir' => $redirectSuppressed ? '1': '0',
3611                 ) );
3612
3613                 $formatter = LogFormatter::newFromEntry( $logEntry );
3614                 $formatter->setContext( RequestContext::newExtraneousContext( $this ) );
3615                 $comment = $formatter->getPlainActionText();
3616                 if ( $reason ) {
3617                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3618                 }
3619                 # Truncate for whole multibyte characters.
3620                 $comment = $wgContLang->truncate( $comment, 255 );
3621
3622                 $oldid = $this->getArticleID();
3623                 $latest = $this->getLatestRevID();
3624
3625                 $dbw = wfGetDB( DB_MASTER );
3626
3627                 if ( $moveOverRedirect ) {
3628                         $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
3629
3630                         $newid = $nt->getArticleID();
3631                         $newns = $nt->getNamespace();
3632                         $newdbk = $nt->getDBkey();
3633
3634                         # Delete the old redirect. We don't save it to history since
3635                         # by definition if we've got here it's rather uninteresting.
3636                         # We have to remove it so that the next step doesn't trigger
3637                         # a conflict on the unique namespace+title index...
3638                         $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
3639                         if ( !$dbw->cascadingDeletes() ) {
3640                                 $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
3641
3642                                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
3643                                 $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
3644                                 $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
3645                                 $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
3646                                 $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
3647                                 $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
3648                                 $dbw->delete( 'iwlinks', array( 'iwl_from' => $newid ), __METHOD__ );
3649                                 $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
3650                                 $dbw->delete( 'page_props', array( 'pp_page' => $newid ), __METHOD__ );
3651                         }
3652                         // If the target page was recently created, it may have an entry in recentchanges still
3653                         $dbw->delete( 'recentchanges',
3654                                 array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
3655                                 __METHOD__
3656                         );
3657                 }
3658
3659                 # Save a null revision in the page's history notifying of the move
3660                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3661                 if ( !is_object( $nullRevision ) ) {
3662                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3663                 }
3664                 $nullRevId = $nullRevision->insertOn( $dbw );
3665
3666                 $now = wfTimestampNow();
3667                 # Change the name of the target page:
3668                 $dbw->update( 'page',
3669                         /* SET */ array(
3670                                 'page_touched'   => $dbw->timestamp( $now ),
3671                                 'page_namespace' => $nt->getNamespace(),
3672                                 'page_title'     => $nt->getDBkey(),
3673                                 'page_latest'    => $nullRevId,
3674                         ),
3675                         /* WHERE */ array( 'page_id' => $oldid ),
3676                         __METHOD__
3677                 );
3678                 $nt->resetArticleID( $oldid );
3679
3680                 $article = WikiPage::factory( $nt );
3681                 wfRunHooks( 'NewRevisionFromEditComplete',
3682                         array( $article, $nullRevision, $latest, $wgUser ) );
3683                 $article->setCachedLastEditTime( $now );
3684
3685                 # Recreate the redirect, this time in the other direction.
3686                 if ( $createRedirect || !$wgUser->isAllowed( 'suppressredirect' ) ) {
3687                         $mwRedir = MagicWord::get( 'redirect' );
3688                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3689                         $redirectArticle = WikiPage::factory( $this );
3690                         $newid = $redirectArticle->insertOn( $dbw );
3691                         if ( $newid ) { // sanity
3692                                 $redirectRevision = new Revision( array(
3693                                         'page'    => $newid,
3694                                         'comment' => $comment,
3695                                         'text'    => $redirectText ) );
3696                                 $redirectRevision->insertOn( $dbw );
3697                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3698
3699                                 wfRunHooks( 'NewRevisionFromEditComplete',
3700                                         array( $redirectArticle, $redirectRevision, false, $wgUser ) );
3701
3702                                 # Now, we record the link from the redirect to the new title.
3703                                 # It should have no other outgoing links...
3704                                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
3705                                 $dbw->insert( 'pagelinks',
3706                                         array(
3707                                                 'pl_from'      => $newid,
3708                                                 'pl_namespace' => $nt->getNamespace(),
3709                                                 'pl_title'     => $nt->getDBkey() ),
3710                                         __METHOD__ );
3711                         }
3712                 } else {
3713                         $this->resetArticleID( 0 );
3714                 }
3715
3716                 # Log the move
3717                 $logid = $logEntry->insert();
3718                 $logEntry->publish( $logid );
3719
3720                 # Purge caches for old and new titles
3721                 if ( $moveOverRedirect ) {
3722                         # A simple purge is enough when moving over a redirect
3723                         $nt->purgeSquid();
3724                 } else {
3725                         # Purge caches as per article creation, including any pages that link to this title
3726                         Article::onArticleCreate( $nt );
3727                 }
3728                 $this->purgeSquid();
3729         }
3730
3731         /**
3732          * Move this page's subpages to be subpages of $nt
3733          *
3734          * @param $nt Title Move target
3735          * @param $auth bool Whether $wgUser's permissions should be checked
3736          * @param $reason string The reason for the move
3737          * @param $createRedirect bool Whether to create redirects from the old subpages to
3738          *     the new ones Ignored if the user doesn't have the 'suppressredirect' right
3739          * @return mixed array with old page titles as keys, and strings (new page titles) or
3740          *     arrays (errors) as values, or an error array with numeric indices if no pages
3741          *     were moved
3742          */
3743         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3744                 global $wgMaximumMovedPages;
3745                 // Check permissions
3746                 if ( !$this->userCan( 'move-subpages' ) ) {
3747                         return array( 'cant-move-subpages' );
3748                 }
3749                 // Do the source and target namespaces support subpages?
3750                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
3751                         return array( 'namespace-nosubpages',
3752                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3753                 }
3754                 if ( !MWNamespace::hasSubpages( $nt->getNamespace() ) ) {
3755                         return array( 'namespace-nosubpages',
3756                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3757                 }
3758
3759                 $subpages = $this->getSubpages( $wgMaximumMovedPages + 1 );
3760                 $retval = array();
3761                 $count = 0;
3762                 foreach ( $subpages as $oldSubpage ) {
3763                         $count++;
3764                         if ( $count > $wgMaximumMovedPages ) {
3765                                 $retval[$oldSubpage->getPrefixedTitle()] =
3766                                                 array( 'movepage-max-pages',
3767                                                         $wgMaximumMovedPages );
3768                                 break;
3769                         }
3770
3771                         // We don't know whether this function was called before
3772                         // or after moving the root page, so check both
3773                         // $this and $nt
3774                         if ( $oldSubpage->getArticleId() == $this->getArticleId() ||
3775                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3776                         {
3777                                 // When moving a page to a subpage of itself,
3778                                 // don't move it twice
3779                                 continue;
3780                         }
3781                         $newPageName = preg_replace(
3782                                         '#^' . preg_quote( $this->getDBkey(), '#' ) . '#',
3783                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3784                                         $oldSubpage->getDBkey() );
3785                         if ( $oldSubpage->isTalkPage() ) {
3786                                 $newNs = $nt->getTalkPage()->getNamespace();
3787                         } else {
3788                                 $newNs = $nt->getSubjectPage()->getNamespace();
3789                         }
3790                         # Bug 14385: we need makeTitleSafe because the new page names may
3791                         # be longer than 255 characters.
3792                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3793
3794                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3795                         if ( $success === true ) {
3796                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3797                         } else {
3798                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3799                         }
3800                 }
3801                 return $retval;
3802         }
3803
3804         /**
3805          * Checks if this page is just a one-rev redirect.
3806          * Adds lock, so don't use just for light purposes.
3807          *
3808          * @return Bool
3809          */
3810         public function isSingleRevRedirect() {
3811                 $dbw = wfGetDB( DB_MASTER );
3812                 # Is it a redirect?
3813                 $row = $dbw->selectRow( 'page',
3814                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3815                         $this->pageCond(),
3816                         __METHOD__,
3817                         array( 'FOR UPDATE' )
3818                 );
3819                 # Cache some fields we may want
3820                 $this->mArticleID = $row ? intval( $row->page_id ) : 0;
3821                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3822                 $this->mLatestID = $row ? intval( $row->page_latest ) : false;
3823                 if ( !$this->mRedirect ) {
3824                         return false;
3825                 }
3826                 # Does the article have a history?
3827                 $row = $dbw->selectField( array( 'page', 'revision' ),
3828                         'rev_id',
3829                         array( 'page_namespace' => $this->getNamespace(),
3830                                 'page_title' => $this->getDBkey(),
3831                                 'page_id=rev_page',
3832                                 'page_latest != rev_id'
3833                         ),
3834                         __METHOD__,
3835                         array( 'FOR UPDATE' )
3836                 );
3837                 # Return true if there was no history
3838                 return ( $row === false );
3839         }
3840
3841         /**
3842          * Checks if $this can be moved to a given Title
3843          * - Selects for update, so don't call it unless you mean business
3844          *
3845          * @param $nt Title the new title to check
3846          * @return Bool
3847          */
3848         public function isValidMoveTarget( $nt ) {
3849                 # Is it an existing file?
3850                 if ( $nt->getNamespace() == NS_FILE ) {
3851                         $file = wfLocalFile( $nt );
3852                         if ( $file->exists() ) {
3853                                 wfDebug( __METHOD__ . ": file exists\n" );
3854                                 return false;
3855                         }
3856                 }
3857                 # Is it a redirect with no history?
3858                 if ( !$nt->isSingleRevRedirect() ) {
3859                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3860                         return false;
3861                 }
3862                 # Get the article text
3863                 $rev = Revision::newFromTitle( $nt );
3864                 if( !is_object( $rev ) ){
3865                         return false;
3866                 }
3867                 $text = $rev->getText();
3868                 # Does the redirect point to the source?
3869                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3870                 $m = array();
3871                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3872                         $redirTitle = Title::newFromText( $m[1] );
3873                         if ( !is_object( $redirTitle ) ||
3874                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3875                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3876                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3877                                 return false;
3878                         }
3879                 } else {
3880                         # Fail safe
3881                         wfDebug( __METHOD__ . ": failsafe\n" );
3882                         return false;
3883                 }
3884                 return true;
3885         }
3886
3887         /**
3888          * Get categories to which this Title belongs and return an array of
3889          * categories' names.
3890          *
3891          * @return Array of parents in the form:
3892          *        $parent => $currentarticle
3893          */
3894         public function getParentCategories() {
3895                 global $wgContLang;
3896
3897                 $data = array();
3898
3899                 $titleKey = $this->getArticleId();
3900
3901                 if ( $titleKey === 0 ) {
3902                         return $data;
3903                 }
3904
3905                 $dbr = wfGetDB( DB_SLAVE );
3906
3907                 $res = $dbr->select( 'categorylinks', '*',
3908                         array(
3909                                 'cl_from' => $titleKey,
3910                         ),
3911                         __METHOD__,
3912                         array()
3913                 );
3914
3915                 if ( $dbr->numRows( $res ) > 0 ) {
3916                         foreach ( $res as $row ) {
3917                                 // $data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3918                                 $data[$wgContLang->getNSText( NS_CATEGORY ) . ':' . $row->cl_to] = $this->getFullText();
3919                         }
3920                 }
3921                 return $data;
3922         }
3923
3924         /**
3925          * Get a tree of parent categories
3926          *
3927          * @param $children Array with the children in the keys, to check for circular refs
3928          * @return Array Tree of parent categories
3929          */
3930         public function getParentCategoryTree( $children = array() ) {
3931                 $stack = array();
3932                 $parents = $this->getParentCategories();
3933
3934                 if ( $parents ) {
3935                         foreach ( $parents as $parent => $current ) {
3936                                 if ( array_key_exists( $parent, $children ) ) {
3937                                         # Circular reference
3938                                         $stack[$parent] = array();
3939                                 } else {
3940                                         $nt = Title::newFromText( $parent );
3941                                         if ( $nt ) {
3942                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array( $parent => 1 ) );
3943                                         }
3944                                 }
3945                         }
3946                 }
3947
3948                 return $stack;
3949         }
3950
3951         /**
3952          * Get an associative array for selecting this title from
3953          * the "page" table
3954          *
3955          * @return Array suitable for the $where parameter of DB::select()
3956          */
3957         public function pageCond() {
3958                 if ( $this->mArticleID > 0 ) {
3959                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3960                         return array( 'page_id' => $this->mArticleID );
3961                 } else {
3962                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3963                 }
3964         }
3965
3966         /**
3967          * Get the revision ID of the previous revision
3968          *
3969          * @param $revId Int Revision ID. Get the revision that was before this one.
3970          * @param $flags Int Title::GAID_FOR_UPDATE
3971          * @return Int|Bool Old revision ID, or FALSE if none exists
3972          */
3973         public function getPreviousRevisionID( $revId, $flags = 0 ) {
3974                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3975                 return $db->selectField( 'revision', 'rev_id',
3976                         array(
3977                                 'rev_page' => $this->getArticleId( $flags ),
3978                                 'rev_id < ' . intval( $revId )
3979                         ),
3980                         __METHOD__,
3981                         array( 'ORDER BY' => 'rev_id DESC' )
3982                 );
3983         }
3984
3985         /**
3986          * Get the revision ID of the next revision
3987          *
3988          * @param $revId Int Revision ID. Get the revision that was after this one.
3989          * @param $flags Int Title::GAID_FOR_UPDATE
3990          * @return Int|Bool Next revision ID, or FALSE if none exists
3991          */
3992         public function getNextRevisionID( $revId, $flags = 0 ) {
3993                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3994                 return $db->selectField( 'revision', 'rev_id',
3995                         array(
3996                                 'rev_page' => $this->getArticleId( $flags ),
3997                                 'rev_id > ' . intval( $revId )
3998                         ),
3999                         __METHOD__,
4000                         array( 'ORDER BY' => 'rev_id' )
4001                 );
4002         }
4003
4004         /**
4005          * Get the first revision of the page
4006          *
4007          * @param $flags Int Title::GAID_FOR_UPDATE
4008          * @return Revision|Null if page doesn't exist
4009          */
4010         public function getFirstRevision( $flags = 0 ) {
4011                 $pageId = $this->getArticleId( $flags );
4012                 if ( $pageId ) {
4013                         $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
4014                         $row = $db->selectRow( 'revision', '*',
4015                                 array( 'rev_page' => $pageId ),
4016                                 __METHOD__,
4017                                 array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
4018                         );
4019                         if ( $row ) {
4020                                 return new Revision( $row );
4021                         }
4022                 }
4023                 return null;
4024         }
4025
4026         /**
4027          * Get the oldest revision timestamp of this page
4028          *
4029          * @param $flags Int Title::GAID_FOR_UPDATE
4030          * @return String: MW timestamp
4031          */
4032         public function getEarliestRevTime( $flags = 0 ) {
4033                 $rev = $this->getFirstRevision( $flags );
4034                 return $rev ? $rev->getTimestamp() : null;
4035         }
4036
4037         /**
4038          * Check if this is a new page
4039          *
4040          * @return bool
4041          */
4042         public function isNewPage() {
4043                 $dbr = wfGetDB( DB_SLAVE );
4044                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
4045         }
4046
4047         /**
4048          * Get the number of revisions between the given revision.
4049          * Used for diffs and other things that really need it.
4050          *
4051          * @param $old int|Revision Old revision or rev ID (first before range)
4052          * @param $new int|Revision New revision or rev ID (first after range)
4053          * @return Int Number of revisions between these revisions.
4054          */
4055         public function countRevisionsBetween( $old, $new ) {
4056                 if ( !( $old instanceof Revision ) ) {
4057                         $old = Revision::newFromTitle( $this, (int)$old );
4058                 }
4059                 if ( !( $new instanceof Revision ) ) {
4060                         $new = Revision::newFromTitle( $this, (int)$new );
4061                 }
4062                 if ( !$old || !$new ) {
4063                         return 0; // nothing to compare
4064                 }
4065                 $dbr = wfGetDB( DB_SLAVE );
4066                 return (int)$dbr->selectField( 'revision', 'count(*)',
4067                         array(
4068                                 'rev_page' => $this->getArticleId(),
4069                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4070                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4071                         ),
4072                         __METHOD__
4073                 );
4074         }
4075
4076         /**
4077          * Get the number of authors between the given revision IDs.
4078          * Used for diffs and other things that really need it.
4079          *
4080          * @param $old int|Revision Old revision or rev ID (first before range)
4081          * @param $new int|Revision New revision or rev ID (first after range)
4082          * @param $limit Int Maximum number of authors
4083          * @return Int Number of revision authors between these revisions.
4084          */
4085         public function countAuthorsBetween( $old, $new, $limit ) {
4086                 if ( !( $old instanceof Revision ) ) {
4087                         $old = Revision::newFromTitle( $this, (int)$old );
4088                 }
4089                 if ( !( $new instanceof Revision ) ) {
4090                         $new = Revision::newFromTitle( $this, (int)$new );
4091                 }
4092                 if ( !$old || !$new ) {
4093                         return 0; // nothing to compare
4094                 }
4095                 $dbr = wfGetDB( DB_SLAVE );
4096                 $res = $dbr->select( 'revision', 'DISTINCT rev_user_text',
4097                         array(
4098                                 'rev_page' => $this->getArticleID(),
4099                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4100                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4101                         ), __METHOD__,
4102                         array( 'LIMIT' => $limit + 1 ) // add one so caller knows it was truncated
4103                 );
4104                 return (int)$dbr->numRows( $res );
4105         }
4106
4107         /**
4108          * Compare with another title.
4109          *
4110          * @param $title Title
4111          * @return Bool
4112          */
4113         public function equals( Title $title ) {
4114                 // Note: === is necessary for proper matching of number-like titles.
4115                 return $this->getInterwiki() === $title->getInterwiki()
4116                         && $this->getNamespace() == $title->getNamespace()
4117                         && $this->getDBkey() === $title->getDBkey();
4118         }
4119
4120         /**
4121          * Check if this title is a subpage of another title
4122          *
4123          * @param $title Title
4124          * @return Bool
4125          */
4126         public function isSubpageOf( Title $title ) {
4127                 return $this->getInterwiki() === $title->getInterwiki()
4128                         && $this->getNamespace() == $title->getNamespace()
4129                         && strpos( $this->getDBkey(), $title->getDBkey() . '/' ) === 0;
4130         }
4131
4132         /**
4133          * Check if page exists.  For historical reasons, this function simply
4134          * checks for the existence of the title in the page table, and will
4135          * thus return false for interwiki links, special pages and the like.
4136          * If you want to know if a title can be meaningfully viewed, you should
4137          * probably call the isKnown() method instead.
4138          *
4139          * @return Bool
4140          */
4141         public function exists() {
4142                 return $this->getArticleId() != 0;
4143         }
4144
4145         /**
4146          * Should links to this title be shown as potentially viewable (i.e. as
4147          * "bluelinks"), even if there's no record by this title in the page
4148          * table?
4149          *
4150          * This function is semi-deprecated for public use, as well as somewhat
4151          * misleadingly named.  You probably just want to call isKnown(), which
4152          * calls this function internally.
4153          *
4154          * (ISSUE: Most of these checks are cheap, but the file existence check
4155          * can potentially be quite expensive.  Including it here fixes a lot of
4156          * existing code, but we might want to add an optional parameter to skip
4157          * it and any other expensive checks.)
4158          *
4159          * @return Bool
4160          */
4161         public function isAlwaysKnown() {
4162                 if ( $this->mInterwiki != '' ) {
4163                         return true;  // any interwiki link might be viewable, for all we know
4164                 }
4165                 switch( $this->mNamespace ) {
4166                         case NS_MEDIA:
4167                         case NS_FILE:
4168                                 // file exists, possibly in a foreign repo
4169                                 return (bool)wfFindFile( $this );
4170                         case NS_SPECIAL:
4171                                 // valid special page
4172                                 return SpecialPageFactory::exists( $this->getDBkey() );
4173                         case NS_MAIN:
4174                                 // selflink, possibly with fragment
4175                                 return $this->mDbkeyform == '';
4176                         case NS_MEDIAWIKI:
4177                                 // known system message
4178                                 return $this->hasSourceText() !== false;
4179                         default:
4180                                 return false;
4181                 }
4182         }
4183
4184         /**
4185          * Does this title refer to a page that can (or might) be meaningfully
4186          * viewed?  In particular, this function may be used to determine if
4187          * links to the title should be rendered as "bluelinks" (as opposed to
4188          * "redlinks" to non-existent pages).
4189          *
4190          * @return Bool
4191          */
4192         public function isKnown() {
4193                 return $this->isAlwaysKnown() || $this->exists();
4194         }
4195
4196         /**
4197          * Does this page have source text?
4198          *
4199          * @return Boolean
4200          */
4201         public function hasSourceText() {
4202                 if ( $this->exists() ) {
4203                         return true;
4204                 }
4205
4206                 if ( $this->mNamespace == NS_MEDIAWIKI ) {
4207                         // If the page doesn't exist but is a known system message, default
4208                         // message content will be displayed, same for language subpages-
4209                         // Use always content language to avoid loading hundreds of languages
4210                         // to get the link color.
4211                         global $wgContLang;
4212                         list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4213                         $message = wfMessage( $name )->inLanguage( $wgContLang )->useDatabase( false );
4214                         return $message->exists();
4215                 }
4216
4217                 return false;
4218         }
4219
4220         /**
4221          * Get the default message text or false if the message doesn't exist
4222          *
4223          * @return String or false
4224          */
4225         public function getDefaultMessageText() {
4226                 global $wgContLang;
4227
4228                 if ( $this->getNamespace() != NS_MEDIAWIKI ) { // Just in case
4229                         return false;
4230                 }
4231
4232                 list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4233                 $message = wfMessage( $name )->inLanguage( $lang )->useDatabase( false );
4234
4235                 if ( $message->exists() ) {
4236                         return $message->plain();
4237                 } else {
4238                         return false;
4239                 }
4240         }
4241
4242         /**
4243          * Updates page_touched for this page; called from LinksUpdate.php
4244          *
4245          * @return Bool true if the update succeded
4246          */
4247         public function invalidateCache() {
4248                 if ( wfReadOnly() ) {
4249                         return false;
4250                 }
4251                 $dbw = wfGetDB( DB_MASTER );
4252                 $success = $dbw->update(
4253                         'page',
4254                         array( 'page_touched' => $dbw->timestamp() ),
4255                         $this->pageCond(),
4256                         __METHOD__
4257                 );
4258                 HTMLFileCache::clearFileCache( $this );
4259                 return $success;
4260         }
4261
4262         /**
4263          * Update page_touched timestamps and send squid purge messages for
4264          * pages linking to this title. May be sent to the job queue depending
4265          * on the number of links. Typically called on create and delete.
4266          */
4267         public function touchLinks() {
4268                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
4269                 $u->doUpdate();
4270
4271                 if ( $this->getNamespace() == NS_CATEGORY ) {
4272                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
4273                         $u->doUpdate();
4274                 }
4275         }
4276
4277         /**
4278          * Get the last touched timestamp
4279          *
4280          * @param $db DatabaseBase: optional db
4281          * @return String last-touched timestamp
4282          */
4283         public function getTouched( $db = null ) {
4284                 $db = isset( $db ) ? $db : wfGetDB( DB_SLAVE );
4285                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
4286                 return $touched;
4287         }
4288
4289         /**
4290          * Get the timestamp when this page was updated since the user last saw it.
4291          *
4292          * @param $user User
4293          * @return String|Null
4294          */
4295         public function getNotificationTimestamp( $user = null ) {
4296                 global $wgUser, $wgShowUpdatedMarker;
4297                 // Assume current user if none given
4298                 if ( !$user ) {
4299                         $user = $wgUser;
4300                 }
4301                 // Check cache first
4302                 $uid = $user->getId();
4303                 // avoid isset here, as it'll return false for null entries
4304                 if ( array_key_exists( $uid, $this->mNotificationTimestamp ) ) {
4305                         return $this->mNotificationTimestamp[$uid];
4306                 }
4307                 if ( !$uid || !$wgShowUpdatedMarker ) {
4308                         return $this->mNotificationTimestamp[$uid] = false;
4309                 }
4310                 // Don't cache too much!
4311                 if ( count( $this->mNotificationTimestamp ) >= self::CACHE_MAX ) {
4312                         $this->mNotificationTimestamp = array();
4313                 }
4314                 $dbr = wfGetDB( DB_SLAVE );
4315                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
4316                         'wl_notificationtimestamp',
4317                         array( 'wl_namespace' => $this->getNamespace(),
4318                                 'wl_title' => $this->getDBkey(),
4319                                 'wl_user' => $user->getId()
4320                         ),
4321                         __METHOD__
4322                 );
4323                 return $this->mNotificationTimestamp[$uid];
4324         }
4325
4326         /**
4327          * Generate strings used for xml 'id' names in monobook tabs
4328          *
4329          * @param $prepend string defaults to 'nstab-'
4330          * @return String XML 'id' name
4331          */
4332         public function getNamespaceKey( $prepend = 'nstab-' ) {
4333                 global $wgContLang;
4334                 // Gets the subject namespace if this title
4335                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4336                 // Checks if cononical namespace name exists for namespace
4337                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4338                         // Uses canonical namespace name
4339                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4340                 } else {
4341                         // Uses text of namespace
4342                         $namespaceKey = $this->getSubjectNsText();
4343                 }
4344                 // Makes namespace key lowercase
4345                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4346                 // Uses main
4347                 if ( $namespaceKey == '' ) {
4348                         $namespaceKey = 'main';
4349                 }
4350                 // Changes file to image for backwards compatibility
4351                 if ( $namespaceKey == 'file' ) {
4352                         $namespaceKey = 'image';
4353                 }
4354                 return $prepend . $namespaceKey;
4355         }
4356
4357         /**
4358          * Get all extant redirects to this Title
4359          *
4360          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4361          * @return Array of Title redirects to this title
4362          */
4363         public function getRedirectsHere( $ns = null ) {
4364                 $redirs = array();
4365
4366                 $dbr = wfGetDB( DB_SLAVE );
4367                 $where = array(
4368                         'rd_namespace' => $this->getNamespace(),
4369                         'rd_title' => $this->getDBkey(),
4370                         'rd_from = page_id'
4371                 );
4372                 if ( !is_null( $ns ) ) {
4373                         $where['page_namespace'] = $ns;
4374                 }
4375
4376                 $res = $dbr->select(
4377                         array( 'redirect', 'page' ),
4378                         array( 'page_namespace', 'page_title' ),
4379                         $where,
4380                         __METHOD__
4381                 );
4382
4383                 foreach ( $res as $row ) {
4384                         $redirs[] = self::newFromRow( $row );
4385                 }
4386                 return $redirs;
4387         }
4388
4389         /**
4390          * Check if this Title is a valid redirect target
4391          *
4392          * @return Bool
4393          */
4394         public function isValidRedirectTarget() {
4395                 global $wgInvalidRedirectTargets;
4396
4397                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4398                 if ( $this->isSpecial( 'Userlogout' ) ) {
4399                         return false;
4400                 }
4401
4402                 foreach ( $wgInvalidRedirectTargets as $target ) {
4403                         if ( $this->isSpecial( $target ) ) {
4404                                 return false;
4405                         }
4406                 }
4407
4408                 return true;
4409         }
4410
4411         /**
4412          * Get a backlink cache object
4413          *
4414          * @return BacklinkCache
4415          */
4416         function getBacklinkCache() {
4417                 if ( is_null( $this->mBacklinkCache ) ) {
4418                         $this->mBacklinkCache = new BacklinkCache( $this );
4419                 }
4420                 return $this->mBacklinkCache;
4421         }
4422
4423         /**
4424          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4425          *
4426          * @return Boolean
4427          */
4428         public function canUseNoindex() {
4429                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4430
4431                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4432                         ? $wgContentNamespaces
4433                         : $wgExemptFromUserRobotsControl;
4434
4435                 return !in_array( $this->mNamespace, $bannedNamespaces );
4436
4437         }
4438
4439         /**
4440          * Returns the raw sort key to be used for categories, with the specified
4441          * prefix.  This will be fed to Collation::getSortKey() to get a
4442          * binary sortkey that can be used for actual sorting.
4443          *
4444          * @param $prefix string The prefix to be used, specified using
4445          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4446          *   prefix.
4447          * @return string
4448          */
4449         public function getCategorySortkey( $prefix = '' ) {
4450                 $unprefixed = $this->getText();
4451
4452                 // Anything that uses this hook should only depend
4453                 // on the Title object passed in, and should probably
4454                 // tell the users to run updateCollations.php --force
4455                 // in order to re-sort existing category relations.
4456                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4457                 if ( $prefix !== '' ) {
4458                         # Separate with a line feed, so the unprefixed part is only used as
4459                         # a tiebreaker when two pages have the exact same prefix.
4460                         # In UCA, tab is the only character that can sort above LF
4461                         # so we strip both of them from the original prefix.
4462                         $prefix = strtr( $prefix, "\n\t", '  ' );
4463                         return "$prefix\n$unprefixed";
4464                 }
4465                 return $unprefixed;
4466         }
4467
4468         /**
4469          * Get the language in which the content of this page is written.
4470          * Defaults to $wgContLang, but in certain cases it can be e.g.
4471          * $wgLang (such as special pages, which are in the user language).
4472          *
4473          * @since 1.18
4474          * @return object Language
4475          */
4476         public function getPageLanguage() {
4477                 global $wgLang;
4478                 if ( $this->isSpecialPage() ) {
4479                         // special pages are in the user language
4480                         return $wgLang;
4481                 } elseif ( $this->isCssOrJsPage() ) {
4482                         // css/js should always be LTR and is, in fact, English
4483                         return wfGetLangObj( 'en' );
4484                 } elseif ( $this->getNamespace() == NS_MEDIAWIKI ) {
4485                         // Parse mediawiki messages with correct target language
4486                         list( /* $unused */, $lang ) = MessageCache::singleton()->figureMessage( $this->getText() );
4487                         return wfGetLangObj( $lang );
4488                 }
4489                 global $wgContLang;
4490                 // If nothing special, it should be in the wiki content language
4491                 $pageLang = $wgContLang;
4492                 // Hook at the end because we don't want to override the above stuff
4493                 wfRunHooks( 'PageContentLanguage', array( $this, &$pageLang, $wgLang ) );
4494                 return wfGetLangObj( $pageLang );
4495         }
4496 }