includes/Title.php

   1 <?php
   2 /**
   3  * Representation a title within %MediaWiki.
   4  *
   5  * See title.txt
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  */
  24
  25 /**
  26  * Represents a title within MediaWiki.
  27  * Optionally may contain an interwiki designation or namespace.
  28  * @note This class can fetch various kinds of data from the database;
  29  *       however, it does so inefficiently.
  30  *
  31  * @internal documentation reviewed 15 Mar 2010
  32  */
  33 class Title {
  34         /** @name Static cache variables */
  35         // @{
  36         static private $titleCache = array();
  37         // @}
  38
  39         /**
  40          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  41          * commonly used titles. On a batch operation this can become a memory leak
  42          * if not bounded. After hitting this many titles reset the cache.
  43          */
  44         const CACHE_MAX = 1000;
  45
  46         /**
  47          * Used to be GAID_FOR_UPDATE define. Used with getArticleID() and friends
  48          * to use the master DB
  49          */
  50         const GAID_FOR_UPDATE = 1;
  51
  52         /**
  53          * @name Private member variables
  54          * Please use the accessor functions instead.
  55          * @private
  56          */
  57         // @{
  58
  59         var $mTextform = '';              // /< Text form (spaces not underscores) of the main part
  60         var $mUrlform = '';               // /< URL-encoded form of the main part
  61         var $mDbkeyform = '';             // /< Main part with underscores
  62         var $mUserCaseDBKey;              // /< DB key with the initial letter in the case specified by the user
  63         var $mNamespace = NS_MAIN;        // /< Namespace index, i.e. one of the NS_xxxx constants
  64         var $mInterwiki = '';             // /< Interwiki prefix (or null string)
  65         var $mFragment;                   // /< Title fragment (i.e. the bit after the #)
  66         var $mArticleID = -1;             // /< Article ID, fetched from the link cache on demand
  67         var $mLatestID = false;           // /< ID of most recent revision
  68         var $mContentModel = false;       // /< ID of the page's content model, i.e. one of the CONTENT_MODEL_XXX constants
  69         private $mEstimateRevisions;      // /< Estimated number of revisions; null of not loaded
  70         var $mRestrictions = array();     // /< Array of groups allowed to edit this article
  71         var $mOldRestrictions = false;
  72         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  73         var $mCascadingRestrictions;      // Caching the results of getCascadeProtectionSources
  74         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  75         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  76         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  77         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  78         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  79         var $mTitleProtection;            ///< Cached value for getTitleProtection (create protection)
  80         # Don't change the following default, NS_MAIN is hardcoded in several
  81         # places.  See bug 696.
  82         var $mDefaultNamespace = NS_MAIN; // /< Namespace index when there is no namespace
  83                                                                           # Zero except in {{transclusion}} tags
  84         var $mWatched = null;             // /< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  85         var $mLength = -1;                // /< The page length, 0 for special pages
  86         var $mRedirect = null;            // /< Is the article at this title a redirect?
  87         var $mNotificationTimestamp = array(); // /< Associative array of user ID -> timestamp/false
  88         var $mHasSubpage;                 // /< Whether a page has any subpages
  89         // @}
  90
  91
  92         /**
  93          * Constructor
  94          */
  95         /*protected*/ function __construct() { }
  96
  97         /**
  98          * Create a new Title from a prefixed DB key
  99          *
 100          * @param $key String the database key, which has underscores
 101          *      instead of spaces, possibly including namespace and
 102          *      interwiki prefixes
 103          * @return Title, or NULL on an error
 104          */
 105         public static function newFromDBkey( $key ) {
 106                 $t = new Title();
 107                 $t->mDbkeyform = $key;
 108                 if ( $t->secureAndSplit() ) {
 109                         return $t;
 110                 } else {
 111                         return null;
 112                 }
 113         }
 114
 115         /**
 116          * Create a new Title from text, such as what one would find in a link. De-
 117          * codes any HTML entities in the text.
 118          *
 119          * @param $text String the link text; spaces, prefixes, and an
 120          *   initial ':' indicating the main namespace are accepted.
 121          * @param $defaultNamespace Int the namespace to use if none is speci-
 122          *   fied by a prefix.  If you want to force a specific namespace even if
 123          *   $text might begin with a namespace prefix, use makeTitle() or
 124          *   makeTitleSafe().
 125          * @throws MWException
 126          * @return Title|null - Title or null on an error.
 127          */
 128         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 129                 if ( is_object( $text ) ) {
 130                         throw new MWException( 'Title::newFromText given an object' );
 131                 }
 132
 133                 /**
 134                  * Wiki pages often contain multiple links to the same page.
 135                  * Title normalization and parsing can become expensive on
 136                  * pages with many links, so we can save a little time by
 137                  * caching them.
 138                  *
 139                  * In theory these are value objects and won't get changed...
 140                  */
 141                 if ( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 142                         return Title::$titleCache[$text];
 143                 }
 144
 145                 # Convert things like &eacute; &#257; or &#x3017; into normalized (bug 14952) text
 146                 $filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );
 147
 148                 $t = new Title();
 149                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 150                 $t->mDefaultNamespace = $defaultNamespace;
 151
 152                 static $cachedcount = 0;
 153                 if ( $t->secureAndSplit() ) {
 154                         if ( $defaultNamespace == NS_MAIN ) {
 155                                 if ( $cachedcount >= self::CACHE_MAX ) {
 156                                         # Avoid memory leaks on mass operations...
 157                                         Title::$titleCache = array();
 158                                         $cachedcount = 0;
 159                                 }
 160                                 $cachedcount++;
 161                                 Title::$titleCache[$text] =& $t;
 162                         }
 163                         return $t;
 164                 } else {
 165                         $ret = null;
 166                         return $ret;
 167                 }
 168         }
 169
 170         /**
 171          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 172          *
 173          * Example of wrong and broken code:
 174          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 175          *
 176          * Example of right code:
 177          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 178          *
 179          * Create a new Title from URL-encoded text. Ensures that
 180          * the given title's length does not exceed the maximum.
 181          *
 182          * @param $url String the title, as might be taken from a URL
 183          * @return Title the new object, or NULL on an error
 184          */
 185         public static function newFromURL( $url ) {
 186                 $t = new Title();
 187
 188                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 189                 # but some URLs used it as a space replacement and they still come
 190                 # from some external search tools.
 191                 if ( strpos( self::legalChars(), '+' ) === false ) {
 192                         $url = str_replace( '+', ' ', $url );
 193                 }
 194
 195                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 196                 if ( $t->secureAndSplit() ) {
 197                         return $t;
 198                 } else {
 199                         return null;
 200                 }
 201         }
 202
 203         /**
 204          * Returns a list of fields that are to be selected for initializing Title objects or LinkCache entries.
 205          * Uses $wgContentHandlerUseDB to determine whether to include page_content_model.
 206          *
 207          * @return array
 208          */
 209         protected static function getSelectFields() {
 210                 global $wgContentHandlerUseDB;
 211
 212                 $fields = array(
 213                         'page_namespace', 'page_title', 'page_id',
 214                         'page_len', 'page_is_redirect', 'page_latest',
 215                 );
 216
 217                 if ( $wgContentHandlerUseDB ) {
 218                         $fields[] = 'page_content_model';
 219                 }
 220
 221                 return $fields;
 222         }
 223
 224         /**
 225          * Create a new Title from an article ID
 226          *
 227          * @param $id Int the page_id corresponding to the Title to create
 228          * @param $flags Int use Title::GAID_FOR_UPDATE to use master
 229          * @return Title the new object, or NULL on an error
 230          */
 231         public static function newFromID( $id, $flags = 0 ) {
 232                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 233                 $row = $db->selectRow(
 234                         'page',
 235                         self::getSelectFields(),
 236                         array( 'page_id' => $id ),
 237                         __METHOD__
 238                 );
 239                 if ( $row !== false ) {
 240                         $title = Title::newFromRow( $row );
 241                 } else {
 242                         $title = null;
 243                 }
 244                 return $title;
 245         }
 246
 247         /**
 248          * Make an array of titles from an array of IDs
 249          *
 250          * @param $ids Array of Int Array of IDs
 251          * @return Array of Titles
 252          */
 253         public static function newFromIDs( $ids ) {
 254                 if ( !count( $ids ) ) {
 255                         return array();
 256                 }
 257                 $dbr = wfGetDB( DB_SLAVE );
 258
 259                 $res = $dbr->select(
 260                         'page',
 261                         self::getSelectFields(),
 262                         array( 'page_id' => $ids ),
 263                         __METHOD__
 264                 );
 265
 266                 $titles = array();
 267                 foreach ( $res as $row ) {
 268                         $titles[] = Title::newFromRow( $row );
 269                 }
 270                 return $titles;
 271         }
 272
 273         /**
 274          * Make a Title object from a DB row
 275          *
 276          * @param $row Object database row (needs at least page_title,page_namespace)
 277          * @return Title corresponding Title
 278          */
 279         public static function newFromRow( $row ) {
 280                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 281                 $t->loadFromRow( $row );
 282                 return $t;
 283         }
 284
 285         /**
 286          * Load Title object fields from a DB row.
 287          * If false is given, the title will be treated as non-existing.
 288          *
 289          * @param $row Object|bool database row
 290          */
 291         public function loadFromRow( $row ) {
 292                 if ( $row ) { // page found
 293                         if ( isset( $row->page_id ) )
 294                                 $this->mArticleID = (int)$row->page_id;
 295                         if ( isset( $row->page_len ) )
 296                                 $this->mLength = (int)$row->page_len;
 297                         if ( isset( $row->page_is_redirect ) )
 298                                 $this->mRedirect = (bool)$row->page_is_redirect;
 299                         if ( isset( $row->page_latest ) )
 300                                 $this->mLatestID = (int)$row->page_latest;
 301                         if ( isset( $row->page_content_model ) )
 302                                 $this->mContentModel = strval( $row->page_content_model );
 303                         else
 304                                 $this->mContentModel = false; # initialized lazily in getContentModel()
 305                 } else { // page not found
 306                         $this->mArticleID = 0;
 307                         $this->mLength = 0;
 308                         $this->mRedirect = false;
 309                         $this->mLatestID = 0;
 310                         $this->mContentModel = false; # initialized lazily in getContentModel()
 311                 }
 312         }
 313
 314         /**
 315          * Create a new Title from a namespace index and a DB key.
 316          * It's assumed that $ns and $title are *valid*, for instance when
 317          * they came directly from the database or a special page name.
 318          * For convenience, spaces are converted to underscores so that
 319          * eg user_text fields can be used directly.
 320          *
 321          * @param $ns Int the namespace of the article
 322          * @param $title String the unprefixed database key form
 323          * @param $fragment String the link fragment (after the "#")
 324          * @param $interwiki String the interwiki prefix
 325          * @return Title the new object
 326          */
 327         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 328                 $t = new Title();
 329                 $t->mInterwiki = $interwiki;
 330                 $t->mFragment = $fragment;
 331                 $t->mNamespace = $ns = intval( $ns );
 332                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 333                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 334                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 335                 $t->mTextform = str_replace( '_', ' ', $title );
 336                 $t->mContentModel = false; # initialized lazily in getContentModel()
 337                 return $t;
 338         }
 339
 340         /**
 341          * Create a new Title from a namespace index and a DB key.
 342          * The parameters will be checked for validity, which is a bit slower
 343          * than makeTitle() but safer for user-provided data.
 344          *
 345          * @param $ns Int the namespace of the article
 346          * @param $title String database key form
 347          * @param $fragment String the link fragment (after the "#")
 348          * @param $interwiki String interwiki prefix
 349          * @return Title the new object, or NULL on an error
 350          */
 351         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 352                 if ( !MWNamespace::exists( $ns ) ) {
 353                         return null;
 354                 }
 355
 356                 $t = new Title();
 357                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 358                 if ( $t->secureAndSplit() ) {
 359                         return $t;
 360                 } else {
 361                         return null;
 362                 }
 363         }
 364
 365         /**
 366          * Create a new Title for the Main Page
 367          *
 368          * @return Title the new object
 369          */
 370         public static function newMainPage() {
 371                 $title = Title::newFromText( wfMessage( 'mainpage' )->inContentLanguage()->text() );
 372                 // Don't give fatal errors if the message is broken
 373                 if ( !$title ) {
 374                         $title = Title::newFromText( 'Main Page' );
 375                 }
 376                 return $title;
 377         }
 378
 379         /**
 380          * Extract a redirect destination from a string and return the
 381          * Title, or null if the text doesn't contain a valid redirect
 382          * This will only return the very next target, useful for
 383          * the redirect table and other checks that don't need full recursion
 384          *
 385          * @param $text String: Text with possible redirect
 386          * @return Title: The corresponding Title
 387          * @deprecated since 1.21, use Content::getRedirectTarget instead.
 388          */
 389         public static function newFromRedirect( $text ) {
 390                 ContentHandler::deprecated( __METHOD__, '1.21' );
 391
 392                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 393                 return $content->getRedirectTarget();
 394         }
 395
 396         /**
 397          * Extract a redirect destination from a string and return the
 398          * Title, or null if the text doesn't contain a valid redirect
 399          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 400          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 401          *
 402          * @param $text String Text with possible redirect
 403          * @return Title
 404          * @deprecated since 1.21, use Content::getUltimateRedirectTarget instead.
 405          */
 406         public static function newFromRedirectRecurse( $text ) {
 407                 ContentHandler::deprecated( __METHOD__, '1.21' );
 408
 409                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 410                 return $content->getUltimateRedirectTarget();
 411         }
 412
 413         /**
 414          * Extract a redirect destination from a string and return an
 415          * array of Titles, or null if the text doesn't contain a valid redirect
 416          * The last element in the array is the final destination after all redirects
 417          * have been resolved (up to $wgMaxRedirects times)
 418          *
 419          * @param $text String Text with possible redirect
 420          * @return Array of Titles, with the destination last
 421          * @deprecated since 1.21, use Content::getRedirectChain instead.
 422          */
 423         public static function newFromRedirectArray( $text ) {
 424                 ContentHandler::deprecated( __METHOD__, '1.21' );
 425
 426                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 427                 return $content->getRedirectChain();
 428         }
 429
 430         /**
 431          * Get the prefixed DB key associated with an ID
 432          *
 433          * @param $id Int the page_id of the article
 434          * @return Title an object representing the article, or NULL if no such article was found
 435          */
 436         public static function nameOf( $id ) {
 437                 $dbr = wfGetDB( DB_SLAVE );
 438
 439                 $s = $dbr->selectRow(
 440                         'page',
 441                         array( 'page_namespace', 'page_title' ),
 442                         array( 'page_id' => $id ),
 443                         __METHOD__
 444                 );
 445                 if ( $s === false ) {
 446                         return null;
 447                 }
 448
 449                 $n = self::makeName( $s->page_namespace, $s->page_title );
 450                 return $n;
 451         }
 452
 453         /**
 454          * Get a regex character class describing the legal characters in a link
 455          *
 456          * @return String the list of characters, not delimited
 457          */
 458         public static function legalChars() {
 459                 global $wgLegalTitleChars;
 460                 return $wgLegalTitleChars;
 461         }
 462
 463         /**
 464          * Returns a simple regex that will match on characters and sequences invalid in titles.
 465          * Note that this doesn't pick up many things that could be wrong with titles, but that
 466          * replacing this regex with something valid will make many titles valid.
 467          *
 468          * @return String regex string
 469          */
 470         static function getTitleInvalidRegex() {
 471                 static $rxTc = false;
 472                 if ( !$rxTc ) {
 473                         # Matching titles will be held as illegal.
 474                         $rxTc = '/' .
 475                                 # Any character not allowed is forbidden...
 476                                 '[^' . self::legalChars() . ']' .
 477                                 # URL percent encoding sequences interfere with the ability
 478                                 # to round-trip titles -- you can't link to them consistently.
 479                                 '|%[0-9A-Fa-f]{2}' .
 480                                 # XML/HTML character references produce similar issues.
 481                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 482                                 '|&#[0-9]+;' .
 483                                 '|&#x[0-9A-Fa-f]+;' .
 484                                 '/S';
 485                 }
 486
 487                 return $rxTc;
 488         }
 489
 490         /**
 491          * Get a string representation of a title suitable for
 492          * including in a search index
 493          *
 494          * @param $ns Int a namespace index
 495          * @param $title String text-form main part
 496          * @return String a stripped-down title string ready for the search index
 497          */
 498         public static function indexTitle( $ns, $title ) {
 499                 global $wgContLang;
 500
 501                 $lc = SearchEngine::legalSearchChars() . '&#;';
 502                 $t = $wgContLang->normalizeForSearch( $title );
 503                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 504                 $t = $wgContLang->lc( $t );
 505
 506                 # Handle 's, s'
 507                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 508                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 509
 510                 $t = preg_replace( "/\\s+/", ' ', $t );
 511
 512                 if ( $ns == NS_FILE ) {
 513                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 514                 }
 515                 return trim( $t );
 516         }
 517
 518         /**
 519          * Make a prefixed DB key from a DB key and a namespace index
 520          *
 521          * @param $ns Int numerical representation of the namespace
 522          * @param $title String the DB key form the title
 523          * @param $fragment String The link fragment (after the "#")
 524          * @param $interwiki String The interwiki prefix
 525          * @return String the prefixed form of the title
 526          */
 527         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 528                 global $wgContLang;
 529
 530                 $namespace = $wgContLang->getNsText( $ns );
 531                 $name = $namespace == '' ? $title : "$namespace:$title";
 532                 if ( strval( $interwiki ) != '' ) {
 533                         $name = "$interwiki:$name";
 534                 }
 535                 if ( strval( $fragment ) != '' ) {
 536                         $name .= '#' . $fragment;
 537                 }
 538                 return $name;
 539         }
 540
 541         /**
 542          * Escape a text fragment, say from a link, for a URL
 543          *
 544          * @param $fragment string containing a URL or link fragment (after the "#")
 545          * @return String: escaped string
 546          */
 547         static function escapeFragmentForURL( $fragment ) {
 548                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 549                 # fragments appear not to work in IE (at least up to 7) or in at least
 550                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 551                 # to care if they aren't encoded.
 552                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 553         }
 554
 555         /**
 556          * Callback for usort() to do title sorts by (namespace, title)
 557          *
 558          * @param $a Title
 559          * @param $b Title
 560          *
 561          * @return Integer: result of string comparison, or namespace comparison
 562          */
 563         public static function compare( $a, $b ) {
 564                 if ( $a->getNamespace() == $b->getNamespace() ) {
 565                         return strcmp( $a->getText(), $b->getText() );
 566                 } else {
 567                         return $a->getNamespace() - $b->getNamespace();
 568                 }
 569         }
 570
 571         /**
 572          * Determine whether the object refers to a page within
 573          * this project.
 574          *
 575          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 576          */
 577         public function isLocal() {
 578                 if ( $this->mInterwiki != '' ) {
 579                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 580                 } else {
 581                         return true;
 582                 }
 583         }
 584
 585         /**
 586          * Is this Title interwiki?
 587          *
 588          * @return Bool
 589          */
 590         public function isExternal() {
 591                 return ( $this->mInterwiki != '' );
 592         }
 593
 594         /**
 595          * Get the interwiki prefix (or null string)
 596          *
 597          * @return String Interwiki prefix
 598          */
 599         public function getInterwiki() {
 600                 return $this->mInterwiki;
 601         }
 602
 603         /**
 604          * Determine whether the object refers to a page within
 605          * this project and is transcludable.
 606          *
 607          * @return Bool TRUE if this is transcludable
 608          */
 609         public function isTrans() {
 610                 if ( $this->mInterwiki == '' ) {
 611                         return false;
 612                 }
 613
 614                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 615         }
 616
 617         /**
 618          * Returns the DB name of the distant wiki which owns the object.
 619          *
 620          * @return String the DB name
 621          */
 622         public function getTransWikiID() {
 623                 if ( $this->mInterwiki == '' ) {
 624                         return false;
 625                 }
 626
 627                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 628         }
 629
 630         /**
 631          * Get the text form (spaces not underscores) of the main part
 632          *
 633          * @return String Main part of the title
 634          */
 635         public function getText() {
 636                 return $this->mTextform;
 637         }
 638
 639         /**
 640          * Get the URL-encoded form of the main part
 641          *
 642          * @return String Main part of the title, URL-encoded
 643          */
 644         public function getPartialURL() {
 645                 return $this->mUrlform;
 646         }
 647
 648         /**
 649          * Get the main part with underscores
 650          *
 651          * @return String: Main part of the title, with underscores
 652          */
 653         public function getDBkey() {
 654                 return $this->mDbkeyform;
 655         }
 656
 657         /**
 658          * Get the DB key with the initial letter case as specified by the user
 659          *
 660          * @return String DB key
 661          */
 662         function getUserCaseDBKey() {
 663                 return $this->mUserCaseDBKey;
 664         }
 665
 666         /**
 667          * Get the namespace index, i.e. one of the NS_xxxx constants.
 668          *
 669          * @return Integer: Namespace index
 670          */
 671         public function getNamespace() {
 672                 return $this->mNamespace;
 673         }
 674
 675         /**
 676          * Get the page's content model id, see the CONTENT_MODEL_XXX constants.
 677          *
 678          * @throws MWException
 679          * @return String: Content model id
 680          */
 681         public function getContentModel() {
 682                 if ( !$this->mContentModel ) {
 683                         $linkCache = LinkCache::singleton();
 684                         $linkCache->addLinkObj( $this );
 685                         $this->mContentModel = $linkCache->getGoodLinkFieldObj( $this, 'model' );
 686                 }
 687
 688                 if ( !$this->mContentModel ) {
 689                         $this->mContentModel = ContentHandler::getDefaultModelFor( $this );
 690                 }
 691
 692                 if( !$this->mContentModel ) {
 693                         throw new MWException( 'Failed to determine content model!' );
 694                 }
 695
 696                 return $this->mContentModel;
 697         }
 698
 699         /**
 700          * Convenience method for checking a title's content model name
 701          *
 702          * @param String $id The content model ID (use the CONTENT_MODEL_XXX constants).
 703          * @return Boolean true if $this->getContentModel() == $id
 704          */
 705         public function hasContentModel( $id ) {
 706                 return $this->getContentModel() == $id;
 707         }
 708
 709         /**
 710          * Get the namespace text
 711          *
 712          * @return String: Namespace text
 713          */
 714         public function getNsText() {
 715                 global $wgContLang;
 716
 717                 if ( $this->mInterwiki != '' ) {
 718                         // This probably shouldn't even happen. ohh man, oh yuck.
 719                         // But for interwiki transclusion it sometimes does.
 720                         // Shit. Shit shit shit.
 721                         //
 722                         // Use the canonical namespaces if possible to try to
 723                         // resolve a foreign namespace.
 724                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 725                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 726                         }
 727                 }
 728
 729                 if ( $wgContLang->needsGenderDistinction() &&
 730                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 731                         $gender = GenderCache::singleton()->getGenderOf( $this->getText(), __METHOD__ );
 732                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 733                 }
 734
 735                 return $wgContLang->getNsText( $this->mNamespace );
 736         }
 737
 738         /**
 739          * Get the namespace text of the subject (rather than talk) page
 740          *
 741          * @return String Namespace text
 742          */
 743         public function getSubjectNsText() {
 744                 global $wgContLang;
 745                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 746         }
 747
 748         /**
 749          * Get the namespace text of the talk page
 750          *
 751          * @return String Namespace text
 752          */
 753         public function getTalkNsText() {
 754                 global $wgContLang;
 755                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 756         }
 757
 758         /**
 759          * Could this title have a corresponding talk page?
 760          *
 761          * @return Bool TRUE or FALSE
 762          */
 763         public function canTalk() {
 764                 return( MWNamespace::canTalk( $this->mNamespace ) );
 765         }
 766
 767         /**
 768          * Is this in a namespace that allows actual pages?
 769          *
 770          * @return Bool
 771          * @internal note -- uses hardcoded namespace index instead of constants
 772          */
 773         public function canExist() {
 774                 return $this->mNamespace >= NS_MAIN;
 775         }
 776
 777         /**
 778          * Can this title be added to a user's watchlist?
 779          *
 780          * @return Bool TRUE or FALSE
 781          */
 782         public function isWatchable() {
 783                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 784         }
 785
 786         /**
 787          * Returns true if this is a special page.
 788          *
 789          * @return boolean
 790          */
 791         public function isSpecialPage() {
 792                 return $this->getNamespace() == NS_SPECIAL;
 793         }
 794
 795         /**
 796          * Returns true if this title resolves to the named special page
 797          *
 798          * @param $name String The special page name
 799          * @return boolean
 800          */
 801         public function isSpecial( $name ) {
 802                 if ( $this->isSpecialPage() ) {
 803                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 804                         if ( $name == $thisName ) {
 805                                 return true;
 806                         }
 807                 }
 808                 return false;
 809         }
 810
 811         /**
 812          * If the Title refers to a special page alias which is not the local default, resolve
 813          * the alias, and localise the name as necessary.  Otherwise, return $this
 814          *
 815          * @return Title
 816          */
 817         public function fixSpecialName() {
 818                 if ( $this->isSpecialPage() ) {
 819                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 820                         if ( $canonicalName ) {
 821                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 822                                 if ( $localName != $this->mDbkeyform ) {
 823                                         return Title::makeTitle( NS_SPECIAL, $localName );
 824                                 }
 825                         }
 826                 }
 827                 return $this;
 828         }
 829
 830         /**
 831          * Returns true if the title is inside the specified namespace.
 832          *
 833          * Please make use of this instead of comparing to getNamespace()
 834          * This function is much more resistant to changes we may make
 835          * to namespaces than code that makes direct comparisons.
 836          * @param $ns int The namespace
 837          * @return bool
 838          * @since 1.19
 839          */
 840         public function inNamespace( $ns ) {
 841                 return MWNamespace::equals( $this->getNamespace(), $ns );
 842         }
 843
 844         /**
 845          * Returns true if the title is inside one of the specified namespaces.
 846          *
 847          * @param ...$namespaces The namespaces to check for
 848          * @return bool
 849          * @since 1.19
 850          */
 851         public function inNamespaces( /* ... */ ) {
 852                 $namespaces = func_get_args();
 853                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 854                         $namespaces = $namespaces[0];
 855                 }
 856
 857                 foreach ( $namespaces as $ns ) {
 858                         if ( $this->inNamespace( $ns ) ) {
 859                                 return true;
 860                         }
 861                 }
 862
 863                 return false;
 864         }
 865
 866         /**
 867          * Returns true if the title has the same subject namespace as the
 868          * namespace specified.
 869          * For example this method will take NS_USER and return true if namespace
 870          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 871          * as their subject namespace.
 872          *
 873          * This is MUCH simpler than individually testing for equivilance
 874          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 875          * @since 1.19
 876          * @param $ns int
 877          * @return bool
 878          */
 879         public function hasSubjectNamespace( $ns ) {
 880                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 881         }
 882
 883         /**
 884          * Is this Title in a namespace which contains content?
 885          * In other words, is this a content page, for the purposes of calculating
 886          * statistics, etc?
 887          *
 888          * @return Boolean
 889          */
 890         public function isContentPage() {
 891                 return MWNamespace::isContent( $this->getNamespace() );
 892         }
 893
 894         /**
 895          * Would anybody with sufficient privileges be able to move this page?
 896          * Some pages just aren't movable.
 897          *
 898          * @return Bool TRUE or FALSE
 899          */
 900         public function isMovable() {
 901                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 902                         // Interwiki title or immovable namespace. Hooks don't get to override here
 903                         return false;
 904                 }
 905
 906                 $result = true;
 907                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 908                 return $result;
 909         }
 910
 911         /**
 912          * Is this the mainpage?
 913          * @note Title::newFromText seems to be sufficiently optimized by the title
 914          * cache that we don't need to over-optimize by doing direct comparisons and
 915          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 916          * ends up reporting something differently than $title->isMainPage();
 917          *
 918          * @since 1.18
 919          * @return Bool
 920          */
 921         public function isMainPage() {
 922                 return $this->equals( Title::newMainPage() );
 923         }
 924
 925         /**
 926          * Is this a subpage?
 927          *
 928          * @return Bool
 929          */
 930         public function isSubpage() {
 931                 return MWNamespace::hasSubpages( $this->mNamespace )
 932                         ? strpos( $this->getText(), '/' ) !== false
 933                         : false;
 934         }
 935
 936         /**
 937          * Is this a conversion table for the LanguageConverter?
 938          *
 939          * @return Bool
 940          */
 941         public function isConversionTable() {
 942                 //@todo: ConversionTable should become a separate content model.
 943
 944                 return $this->getNamespace() == NS_MEDIAWIKI &&
 945                         strpos( $this->getText(), 'Conversiontable/' ) === 0;
 946         }
 947
 948         /**
 949          * Does that page contain wikitext, or it is JS, CSS or whatever?
 950          *
 951          * @return Bool
 952          */
 953         public function isWikitextPage() {
 954                 return $this->hasContentModel( CONTENT_MODEL_WIKITEXT );
 955         }
 956
 957         /**
 958          * Could this page contain custom CSS or JavaScript for the global UI.
 959          * This is generally true for pages in the MediaWiki namespace having CONTENT_MODEL_CSS
 960          * or CONTENT_MODEL_JAVASCRIPT.
 961          *
 962          * This method does *not* return true for per-user JS/CSS. Use isCssJsSubpage() for that!
 963          *
 964          * Note that this method should not return true for pages that contain and show "inactive" CSS or JS.
 965          *
 966          * @return Bool
 967          */
 968         public function isCssOrJsPage() {
 969                 $isCssOrJsPage = NS_MEDIAWIKI == $this->mNamespace
 970                         && ( $this->hasContentModel( CONTENT_MODEL_CSS )
 971                                 || $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) );
 972
 973                 #NOTE: this hook is also called in ContentHandler::getDefaultModel. It's called here again to make sure
 974                 #      hook funktions can force this method to return true even outside the mediawiki namespace.
 975
 976                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$isCssOrJsPage ) );
 977
 978                 return $isCssOrJsPage;
 979         }
 980
 981         /**
 982          * Is this a .css or .js subpage of a user page?
 983          * @return Bool
 984          */
 985         public function isCssJsSubpage() {
 986                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
 987                                 && ( $this->hasContentModel( CONTENT_MODEL_CSS )
 988                                         || $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) ) );
 989         }
 990
 991         /**
 992          * Trim down a .css or .js subpage title to get the corresponding skin name
 993          *
 994          * @return string containing skin name from .css or .js subpage title
 995          */
 996         public function getSkinFromCssJsSubpage() {
 997                 $subpage = explode( '/', $this->mTextform );
 998                 $subpage = $subpage[ count( $subpage ) - 1 ];
 999                 $lastdot = strrpos( $subpage, '.' );
1000                 if ( $lastdot === false )
1001                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
1002                 return substr( $subpage, 0, $lastdot );
1003         }
1004
1005         /**
1006          * Is this a .css subpage of a user page?
1007          *
1008          * @return Bool
1009          */
1010         public function isCssSubpage() {
1011                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
1012                         && $this->hasContentModel( CONTENT_MODEL_CSS ) );
1013         }
1014
1015         /**
1016          * Is this a .js subpage of a user page?
1017          *
1018          * @return Bool
1019          */
1020         public function isJsSubpage() {
1021                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
1022                         && $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) );
1023         }
1024
1025         /**
1026          * Is this a talk page of some sort?
1027          *
1028          * @return Bool
1029          */
1030         public function isTalkPage() {
1031                 return MWNamespace::isTalk( $this->getNamespace() );
1032         }
1033
1034         /**
1035          * Get a Title object associated with the talk page of this article
1036          *
1037          * @return Title the object for the talk page
1038          */
1039         public function getTalkPage() {
1040                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1041         }
1042
1043         /**
1044          * Get a title object associated with the subject page of this
1045          * talk page
1046          *
1047          * @return Title the object for the subject page
1048          */
1049         public function getSubjectPage() {
1050                 // Is this the same title?
1051                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1052                 if ( $this->getNamespace() == $subjectNS ) {
1053                         return $this;
1054                 }
1055                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1056         }
1057
1058         /**
1059          * Get the default namespace index, for when there is no namespace
1060          *
1061          * @return Int Default namespace index
1062          */
1063         public function getDefaultNamespace() {
1064                 return $this->mDefaultNamespace;
1065         }
1066
1067         /**
1068          * Get title for search index
1069          *
1070          * @return String a stripped-down title string ready for the
1071          *  search index
1072          */
1073         public function getIndexTitle() {
1074                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1075         }
1076
1077         /**
1078          * Get the Title fragment (i.e.\ the bit after the #) in text form
1079          *
1080          * @return String Title fragment
1081          */
1082         public function getFragment() {
1083                 return $this->mFragment;
1084         }
1085
1086         /**
1087          * Get the fragment in URL form, including the "#" character if there is one
1088          * @return String Fragment in URL form
1089          */
1090         public function getFragmentForURL() {
1091                 if ( $this->mFragment == '' ) {
1092                         return '';
1093                 } else {
1094                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1095                 }
1096         }
1097
1098         /**
1099          * Set the fragment for this title. Removes the first character from the
1100          * specified fragment before setting, so it assumes you're passing it with
1101          * an initial "#".
1102          *
1103          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1104          * Still in active use privately.
1105          *
1106          * @param $fragment String text
1107          */
1108         public function setFragment( $fragment ) {
1109                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1110         }
1111
1112         /**
1113          * Prefix some arbitrary text with the namespace or interwiki prefix
1114          * of this object
1115          *
1116          * @param $name String the text
1117          * @return String the prefixed text
1118          * @private
1119          */
1120         private function prefix( $name ) {
1121                 $p = '';
1122                 if ( $this->mInterwiki != '' ) {
1123                         $p = $this->mInterwiki . ':';
1124                 }
1125
1126                 if ( 0 != $this->mNamespace ) {
1127                         $p .= $this->getNsText() . ':';
1128                 }
1129                 return $p . $name;
1130         }
1131
1132         /**
1133          * Get the prefixed database key form
1134          *
1135          * @return String the prefixed title, with underscores and
1136          *  any interwiki and namespace prefixes
1137          */
1138         public function getPrefixedDBkey() {
1139                 $s = $this->prefix( $this->mDbkeyform );
1140                 $s = str_replace( ' ', '_', $s );
1141                 return $s;
1142         }
1143
1144         /**
1145          * Get the prefixed title with spaces.
1146          * This is the form usually used for display
1147          *
1148          * @return String the prefixed title, with spaces
1149          */
1150         public function getPrefixedText() {
1151                 // @todo FIXME: Bad usage of empty() ?
1152                 if ( empty( $this->mPrefixedText ) ) {
1153                         $s = $this->prefix( $this->mTextform );
1154                         $s = str_replace( '_', ' ', $s );
1155                         $this->mPrefixedText = $s;
1156                 }
1157                 return $this->mPrefixedText;
1158         }
1159
1160         /**
1161          * Return a string representation of this title
1162          *
1163          * @return String representation of this title
1164          */
1165         public function __toString() {
1166                 return $this->getPrefixedText();
1167         }
1168
1169         /**
1170          * Get the prefixed title with spaces, plus any fragment
1171          * (part beginning with '#')
1172          *
1173          * @return String the prefixed title, with spaces and the fragment, including '#'
1174          */
1175         public function getFullText() {
1176                 $text = $this->getPrefixedText();
1177                 if ( $this->mFragment != '' ) {
1178                         $text .= '#' . $this->mFragment;
1179                 }
1180                 return $text;
1181         }
1182
1183         /**
1184          * Get the root page name text without a namespace, i.e. the leftmost part before any slashes
1185          *
1186          * @par Example:
1187          * @code
1188          * Title::newFromText('User:Foo/Bar/Baz')->getRootText();
1189          * # returns: 'Foo'
1190          * @endcode
1191          *
1192          * @return String Root name
1193          * @since 1.20
1194          */
1195         public function getRootText() {
1196                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1197                         return $this->getText();
1198                 }
1199
1200                 return strtok( $this->getText(), '/' );
1201         }
1202
1203         /**
1204          * Get the root page name title, i.e. the leftmost part before any slashes
1205          *
1206          * @par Example:
1207          * @code
1208          * Title::newFromText('User:Foo/Bar/Baz')->getRootTitle();
1209          * # returns: Title{User:Foo}
1210          * @endcode
1211          *
1212          * @return Title Root title
1213          * @since 1.20
1214          */
1215         public function getRootTitle() {
1216                 return Title::makeTitle( $this->getNamespace(), $this->getRootText() );
1217         }
1218
1219         /**
1220          * Get the base page name without a namespace, i.e. the part before the subpage name
1221          *
1222          * @par Example:
1223          * @code
1224          * Title::newFromText('User:Foo/Bar/Baz')->getBaseText();
1225          * # returns: 'Foo/Bar'
1226          * @endcode
1227          *
1228          * @return String Base name
1229          */
1230         public function getBaseText() {
1231                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1232                         return $this->getText();
1233                 }
1234
1235                 $parts = explode( '/', $this->getText() );
1236                 # Don't discard the real title if there's no subpage involved
1237                 if ( count( $parts ) > 1 ) {
1238                         unset( $parts[count( $parts ) - 1] );
1239                 }
1240                 return implode( '/', $parts );
1241         }
1242
1243         /**
1244          * Get the base page name title, i.e. the part before the subpage name
1245          *
1246          * @par Example:
1247          * @code
1248          * Title::newFromText('User:Foo/Bar/Baz')->getBaseTitle();
1249          * # returns: Title{User:Foo/Bar}
1250          * @endcode
1251          *
1252          * @return Title Base title
1253          * @since 1.20
1254          */
1255         public function getBaseTitle() {
1256                 return Title::makeTitle( $this->getNamespace(), $this->getBaseText() );
1257         }
1258
1259         /**
1260          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1261          *
1262          * @par Example:
1263          * @code
1264          * Title::newFromText('User:Foo/Bar/Baz')->getSubpageText();
1265          * # returns: "Baz"
1266          * @endcode
1267          *
1268          * @return String Subpage name
1269          */
1270         public function getSubpageText() {
1271                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1272                         return( $this->mTextform );
1273                 }
1274                 $parts = explode( '/', $this->mTextform );
1275                 return( $parts[count( $parts ) - 1] );
1276         }
1277
1278         /**
1279          * Get the title for a subpage of the current page
1280          *
1281          * @par Example:
1282          * @code
1283          * Title::newFromText('User:Foo/Bar/Baz')->getSubpage("Asdf");
1284          * # returns: Title{User:Foo/Bar/Baz/Asdf}
1285          * @endcode
1286          *
1287          * @param $text String The subpage name to add to the title
1288          * @return Title Subpage title
1289          * @since 1.20
1290          */
1291         public function getSubpage( $text ) {
1292                 return Title::makeTitleSafe( $this->getNamespace(), $this->getText() . '/' . $text );
1293         }
1294
1295         /**
1296          * Get the HTML-escaped displayable text form.
1297          * Used for the title field in <a> tags.
1298          *
1299          * @return String the text, including any prefixes
1300          * @deprecated since 1.19
1301          */
1302         public function getEscapedText() {
1303                 wfDeprecated( __METHOD__, '1.19' );
1304                 return htmlspecialchars( $this->getPrefixedText() );
1305         }
1306
1307         /**
1308          * Get a URL-encoded form of the subpage text
1309          *
1310          * @return String URL-encoded subpage name
1311          */
1312         public function getSubpageUrlForm() {
1313                 $text = $this->getSubpageText();
1314                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1315                 return( $text );
1316         }
1317
1318         /**
1319          * Get a URL-encoded title (not an actual URL) including interwiki
1320          *
1321          * @return String the URL-encoded form
1322          */
1323         public function getPrefixedURL() {
1324                 $s = $this->prefix( $this->mDbkeyform );
1325                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1326                 return $s;
1327         }
1328
1329         /**
1330          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1331          * get{Canonical,Full,Link,Local}URL methods accepted an optional
1332          * second argument named variant. This was deprecated in favor
1333          * of passing an array of option with a "variant" key
1334          * Once $query2 is removed for good, this helper can be dropped
1335          * andthe wfArrayToCgi moved to getLocalURL();
1336          *
1337          * @since 1.19 (r105919)
1338          * @param $query
1339          * @param $query2 bool
1340          * @return String
1341          */
1342         private static function fixUrlQueryArgs( $query, $query2 = false ) {
1343                 if( $query2 !== false ) {
1344                         wfDeprecated( "Title::get{Canonical,Full,Link,Local} method called with a second parameter is deprecated. Add your parameter to an array passed as the first parameter.", "1.19" );
1345                 }
1346                 if ( is_array( $query ) ) {
1347                         $query = wfArrayToCgi( $query );
1348                 }
1349                 if ( $query2 ) {
1350                         if ( is_string( $query2 ) ) {
1351                                 // $query2 is a string, we will consider this to be
1352                                 // a deprecated $variant argument and add it to the query
1353                                 $query2 = wfArrayToCgi( array( 'variant' => $query2 ) );
1354                         } else {
1355                                 $query2 = wfArrayToCgi( $query2 );
1356                         }
1357                         // If we have $query content add a & to it first
1358                         if ( $query ) {
1359                                 $query .= '&';
1360                         }
1361                         // Now append the queries together
1362                         $query .= $query2;
1363                 }
1364                 return $query;
1365         }
1366
1367         /**
1368          * Get a real URL referring to this title, with interwiki link and
1369          * fragment
1370          *
1371          * See getLocalURL for the arguments.
1372          *
1373          * @see self::getLocalURL
1374          * @see wfExpandUrl
1375          * @param $query
1376          * @param $query2 bool
1377          * @param $proto Protocol type to use in URL
1378          * @return String the URL
1379          */
1380         public function getFullURL( $query = '', $query2 = false, $proto = PROTO_RELATIVE ) {
1381                 $query = self::fixUrlQueryArgs( $query, $query2 );
1382
1383                 # Hand off all the decisions on urls to getLocalURL
1384                 $url = $this->getLocalURL( $query );
1385
1386                 # Expand the url to make it a full url. Note that getLocalURL has the
1387                 # potential to output full urls for a variety of reasons, so we use
1388                 # wfExpandUrl instead of simply prepending $wgServer
1389                 $url = wfExpandUrl( $url, $proto );
1390
1391                 # Finally, add the fragment.
1392                 $url .= $this->getFragmentForURL();
1393
1394                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1395                 return $url;
1396         }
1397
1398         /**
1399          * Get a URL with no fragment or server name.  If this page is generated
1400          * with action=render, $wgServer is prepended.
1401          *
1402
1403          * @param $query string|array an optional query string,
1404          *   not used for interwiki links. Can be specified as an associative array as well,
1405          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1406          *   Some query patterns will trigger various shorturl path replacements.
1407          * @param $query2 Mixed: An optional secondary query array. This one MUST
1408          *   be an array. If a string is passed it will be interpreted as a deprecated
1409          *   variant argument and urlencoded into a variant= argument.
1410          *   This second query argument will be added to the $query
1411          *   The second parameter is deprecated since 1.19. Pass it as a key,value
1412          *   pair in the first parameter array instead.
1413          *
1414          * @return String the URL
1415          */
1416         public function getLocalURL( $query = '', $query2 = false ) {
1417                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1418
1419                 $query = self::fixUrlQueryArgs( $query, $query2 );
1420
1421                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1422                 if ( $interwiki ) {
1423                         $namespace = $this->getNsText();
1424                         if ( $namespace != '' ) {
1425                                 # Can this actually happen? Interwikis shouldn't be parsed.
1426                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1427                                 $namespace .= ':';
1428                         }
1429                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1430                         $url = wfAppendQuery( $url, $query );
1431                 } else {
1432                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1433                         if ( $query == '' ) {
1434                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1435                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1436                         } else {
1437                                 global $wgVariantArticlePath, $wgActionPaths;
1438                                 $url = false;
1439                                 $matches = array();
1440
1441                                 if ( !empty( $wgActionPaths ) &&
1442                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1443                                 {
1444                                         $action = urldecode( $matches[2] );
1445                                         if ( isset( $wgActionPaths[$action] ) ) {
1446                                                 $query = $matches[1];
1447                                                 if ( isset( $matches[4] ) ) {
1448                                                         $query .= $matches[4];
1449                                                 }
1450                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1451                                                 if ( $query != '' ) {
1452                                                         $url = wfAppendQuery( $url, $query );
1453                                                 }
1454                                         }
1455                                 }
1456
1457                                 if ( $url === false &&
1458                                         $wgVariantArticlePath &&
1459                                         $this->getPageLanguage()->hasVariants() &&
1460                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1461                                 {
1462                                         $variant = urldecode( $matches[1] );
1463                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1464                                                 // Only do the variant replacement if the given variant is a valid
1465                                                 // variant for the page's language.
1466                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1467                                                 $url = str_replace( '$1', $dbkey, $url );
1468                                         }
1469                                 }
1470
1471                                 if ( $url === false ) {
1472                                         if ( $query == '-' ) {
1473                                                 $query = '';
1474                                         }
1475                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1476                                 }
1477                         }
1478
1479                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1480
1481                         // @todo FIXME: This causes breakage in various places when we
1482                         // actually expected a local URL and end up with dupe prefixes.
1483                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1484                                 $url = $wgServer . $url;
1485                         }
1486                 }
1487                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1488                 return $url;
1489         }
1490
1491         /**
1492          * Get a URL that's the simplest URL that will be valid to link, locally,
1493          * to the current Title.  It includes the fragment, but does not include
1494          * the server unless action=render is used (or the link is external).  If
1495          * there's a fragment but the prefixed text is empty, we just return a link
1496          * to the fragment.
1497          *
1498          * The result obviously should not be URL-escaped, but does need to be
1499          * HTML-escaped if it's being output in HTML.
1500          *
1501          * See getLocalURL for the arguments.
1502          *
1503          * @param $query
1504          * @param $query2 bool
1505          * @param $proto Protocol to use; setting this will cause a full URL to be used
1506          * @see self::getLocalURL
1507          * @return String the URL
1508          */
1509         public function getLinkURL( $query = '', $query2 = false, $proto = PROTO_RELATIVE ) {
1510                 wfProfileIn( __METHOD__ );
1511                 if ( $this->isExternal() || $proto !== PROTO_RELATIVE ) {
1512                         $ret = $this->getFullURL( $query, $query2, $proto );
1513                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1514                         $ret = $this->getFragmentForURL();
1515                 } else {
1516                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1517                 }
1518                 wfProfileOut( __METHOD__ );
1519                 return $ret;
1520         }
1521
1522         /**
1523          * Get an HTML-escaped version of the URL form, suitable for
1524          * using in a link, without a server name or fragment
1525          *
1526          * See getLocalURL for the arguments.
1527          *
1528          * @see self::getLocalURL
1529          * @param $query string
1530          * @param $query2 bool|string
1531          * @return String the URL
1532          * @deprecated since 1.19
1533          */
1534         public function escapeLocalURL( $query = '', $query2 = false ) {
1535                 wfDeprecated( __METHOD__, '1.19' );
1536                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1537         }
1538
1539         /**
1540          * Get an HTML-escaped version of the URL form, suitable for
1541          * using in a link, including the server name and fragment
1542          *
1543          * See getLocalURL for the arguments.
1544          *
1545          * @see self::getLocalURL
1546          * @return String the URL
1547          * @deprecated since 1.19
1548          */
1549         public function escapeFullURL( $query = '', $query2 = false ) {
1550                 wfDeprecated( __METHOD__, '1.19' );
1551                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1552         }
1553
1554         /**
1555          * Get the URL form for an internal link.
1556          * - Used in various Squid-related code, in case we have a different
1557          * internal hostname for the server from the exposed one.
1558          *
1559          * This uses $wgInternalServer to qualify the path, or $wgServer
1560          * if $wgInternalServer is not set. If the server variable used is
1561          * protocol-relative, the URL will be expanded to http://
1562          *
1563          * See getLocalURL for the arguments.
1564          *
1565          * @see self::getLocalURL
1566          * @return String the URL
1567          */
1568         public function getInternalURL( $query = '', $query2 = false ) {
1569                 global $wgInternalServer, $wgServer;
1570                 $query = self::fixUrlQueryArgs( $query, $query2 );
1571                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1572                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1573                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1574                 return $url;
1575         }
1576
1577         /**
1578          * Get the URL for a canonical link, for use in things like IRC and
1579          * e-mail notifications. Uses $wgCanonicalServer and the
1580          * GetCanonicalURL hook.
1581          *
1582          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1583          *
1584          * See getLocalURL for the arguments.
1585          *
1586          * @see self::getLocalURL
1587          * @return string The URL
1588          * @since 1.18
1589          */
1590         public function getCanonicalURL( $query = '', $query2 = false ) {
1591                 $query = self::fixUrlQueryArgs( $query, $query2 );
1592                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1593                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1594                 return $url;
1595         }
1596
1597         /**
1598          * HTML-escaped version of getCanonicalURL()
1599          *
1600          * See getLocalURL for the arguments.
1601          *
1602          * @see self::getLocalURL
1603          * @since 1.18
1604          * @return string
1605          * @deprecated since 1.19
1606          */
1607         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1608                 wfDeprecated( __METHOD__, '1.19' );
1609                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1610         }
1611
1612         /**
1613          * Get the edit URL for this Title
1614          *
1615          * @return String the URL, or a null string if this is an
1616          *  interwiki link
1617          */
1618         public function getEditURL() {
1619                 if ( $this->mInterwiki != '' ) {
1620                         return '';
1621                 }
1622                 $s = $this->getLocalURL( 'action=edit' );
1623
1624                 return $s;
1625         }
1626
1627         /**
1628          * Is $wgUser watching this page?
1629          *
1630          * @deprecated in 1.20; use User::isWatched() instead.
1631          * @return Bool
1632          */
1633         public function userIsWatching() {
1634                 global $wgUser;
1635
1636                 if ( is_null( $this->mWatched ) ) {
1637                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1638                                 $this->mWatched = false;
1639                         } else {
1640                                 $this->mWatched = $wgUser->isWatched( $this );
1641                         }
1642                 }
1643                 return $this->mWatched;
1644         }
1645
1646         /**
1647          * Can $wgUser read this page?
1648          *
1649          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1650          * @return Bool
1651          * @todo fold these checks into userCan()
1652          */
1653         public function userCanRead() {
1654                 wfDeprecated( __METHOD__, '1.19' );
1655                 return $this->userCan( 'read' );
1656         }
1657
1658         /**
1659          * Can $user perform $action on this page?
1660          * This skips potentially expensive cascading permission checks
1661          * as well as avoids expensive error formatting
1662          *
1663          * Suitable for use for nonessential UI controls in common cases, but
1664          * _not_ for functional access control.
1665          *
1666          * May provide false positives, but should never provide a false negative.
1667          *
1668          * @param $action String action that permission needs to be checked for
1669          * @param $user User to check (since 1.19); $wgUser will be used if not
1670          *              provided.
1671          * @return Bool
1672          */
1673         public function quickUserCan( $action, $user = null ) {
1674                 return $this->userCan( $action, $user, false );
1675         }
1676
1677         /**
1678          * Can $user perform $action on this page?
1679          *
1680          * @param $action String action that permission needs to be checked for
1681          * @param $user User to check (since 1.19); $wgUser will be used if not
1682          *   provided.
1683          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1684          *   unnecessary queries.
1685          * @return Bool
1686          */
1687         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1688                 if ( !$user instanceof User ) {
1689                         global $wgUser;
1690                         $user = $wgUser;
1691                 }
1692                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1693         }
1694
1695         /**
1696          * Can $user perform $action on this page?
1697          *
1698          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1699          *
1700          * @param $action String action that permission needs to be checked for
1701          * @param $user User to check
1702          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1703          *   queries by skipping checks for cascading protections and user blocks.
1704          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1705          *   whose corresponding errors may be ignored.
1706          * @return Array of arguments to wfMessage to explain permissions problems.
1707          */
1708         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1709                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1710
1711                 // Remove the errors being ignored.
1712                 foreach ( $errors as $index => $error ) {
1713                         $error_key = is_array( $error ) ? $error[0] : $error;
1714
1715                         if ( in_array( $error_key, $ignoreErrors ) ) {
1716                                 unset( $errors[$index] );
1717                         }
1718                 }
1719
1720                 return $errors;
1721         }
1722
1723         /**
1724          * Permissions checks that fail most often, and which are easiest to test.
1725          *
1726          * @param $action String the action to check
1727          * @param $user User user to check
1728          * @param $errors Array list of current errors
1729          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1730          * @param $short Boolean short circuit on first error
1731          *
1732          * @return Array list of errors
1733          */
1734         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1735                 if ( $action == 'create' ) {
1736                         if (
1737                                 ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1738                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) )
1739                         ) {
1740                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1741                         }
1742                 } elseif ( $action == 'move' ) {
1743                         if ( !$user->isAllowed( 'move-rootuserpages' )
1744                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1745                                 // Show user page-specific message only if the user can move other pages
1746                                 $errors[] = array( 'cant-move-user-page' );
1747                         }
1748
1749                         // Check if user is allowed to move files if it's a file
1750                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1751                                 $errors[] = array( 'movenotallowedfile' );
1752                         }
1753
1754                         if ( !$user->isAllowed( 'move' ) ) {
1755                                 // User can't move anything
1756                                 $userCanMove = User::groupHasPermission( 'user', 'move' );
1757                                 $autoconfirmedCanMove = User::groupHasPermission( 'autoconfirmed', 'move' );
1758                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1759                                         // custom message if logged-in users without any special rights can move
1760                                         $errors[] = array( 'movenologintext' );
1761                                 } else {
1762                                         $errors[] = array( 'movenotallowed' );
1763                                 }
1764                         }
1765                 } elseif ( $action == 'move-target' ) {
1766                         if ( !$user->isAllowed( 'move' ) ) {
1767                                 // User can't move anything
1768                                 $errors[] = array( 'movenotallowed' );
1769                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1770                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1771                                 // Show user page-specific message only if the user can move other pages
1772                                 $errors[] = array( 'cant-move-to-user-page' );
1773                         }
1774                 } elseif ( !$user->isAllowed( $action ) ) {
1775                         $errors[] = $this->missingPermissionError( $action, $short );
1776                 }
1777
1778                 return $errors;
1779         }
1780
1781         /**
1782          * Add the resulting error code to the errors array
1783          *
1784          * @param $errors Array list of current errors
1785          * @param $result Mixed result of errors
1786          *
1787          * @return Array list of errors
1788          */
1789         private function resultToError( $errors, $result ) {
1790                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1791                         // A single array representing an error
1792                         $errors[] = $result;
1793                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1794                         // A nested array representing multiple errors
1795                         $errors = array_merge( $errors, $result );
1796                 } elseif ( $result !== '' && is_string( $result ) ) {
1797                         // A string representing a message-id
1798                         $errors[] = array( $result );
1799                 } elseif ( $result === false ) {
1800                         // a generic "We don't want them to do that"
1801                         $errors[] = array( 'badaccess-group0' );
1802                 }
1803                 return $errors;
1804         }
1805
1806         /**
1807          * Check various permission hooks
1808          *
1809          * @param $action String the action to check
1810          * @param $user 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 checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1818                 // Use getUserPermissionsErrors instead
1819                 $result = '';
1820                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1821                         return $result ? array() : array( array( 'badaccess-group0' ) );
1822                 }
1823                 // Check getUserPermissionsErrors hook
1824                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1825                         $errors = $this->resultToError( $errors, $result );
1826                 }
1827                 // Check getUserPermissionsErrorsExpensive hook
1828                 if (
1829                         $doExpensiveQueries
1830                         && !( $short && count( $errors ) > 0 )
1831                         && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) )
1832                 ) {
1833                         $errors = $this->resultToError( $errors, $result );
1834                 }
1835
1836                 return $errors;
1837         }
1838
1839         /**
1840          * Check permissions on special pages & namespaces
1841          *
1842          * @param $action String the action to check
1843          * @param $user User user to check
1844          * @param $errors Array list of current errors
1845          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1846          * @param $short Boolean short circuit on first error
1847          *
1848          * @return Array list of errors
1849          */
1850         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1851                 # Only 'createaccount' can be performed on special pages,
1852                 # which don't actually exist in the DB.
1853                 if ( NS_SPECIAL == $this->mNamespace && $action !== 'createaccount' ) {
1854                         $errors[] = array( 'ns-specialprotected' );
1855                 }
1856
1857                 # Check $wgNamespaceProtection for restricted namespaces
1858                 if ( $this->isNamespaceProtected( $user ) ) {
1859                         $ns = $this->mNamespace == NS_MAIN ?
1860                                 wfMessage( 'nstab-main' )->text() : $this->getNsText();
1861                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1862                                 array( 'protectedinterface' ) : array( 'namespaceprotected', $ns );
1863                 }
1864
1865                 return $errors;
1866         }
1867
1868         /**
1869          * Check CSS/JS sub-page permissions
1870          *
1871          * @param $action String the action to check
1872          * @param $user User user to check
1873          * @param $errors Array list of current errors
1874          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1875          * @param $short Boolean short circuit on first error
1876          *
1877          * @return Array list of errors
1878          */
1879         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1880                 # Protect css/js subpages of user pages
1881                 # XXX: this might be better using restrictions
1882                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1883                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1884                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1885                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1886                                 $errors[] = array( 'customcssprotected' );
1887                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1888                                 $errors[] = array( 'customjsprotected' );
1889                         }
1890                 }
1891
1892                 return $errors;
1893         }
1894
1895         /**
1896          * Check against page_restrictions table requirements on this
1897          * page. The user must possess all required rights for this
1898          * action.
1899          *
1900          * @param $action String the action to check
1901          * @param $user User user to check
1902          * @param $errors Array list of current errors
1903          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1904          * @param $short Boolean short circuit on first error
1905          *
1906          * @return Array list of errors
1907          */
1908         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1909                 foreach ( $this->getRestrictions( $action ) as $right ) {
1910                         // Backwards compatibility, rewrite sysop -> protect
1911                         if ( $right == 'sysop' ) {
1912                                 $right = 'protect';
1913                         }
1914                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1915                                 // Users with 'editprotected' permission can edit protected pages
1916                                 // without cascading option turned on.
1917                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1918                                         || $this->mCascadeRestriction )
1919                                 {
1920                                         $errors[] = array( 'protectedpagetext', $right );
1921                                 }
1922                         }
1923                 }
1924
1925                 return $errors;
1926         }
1927
1928         /**
1929          * Check restrictions on cascading pages.
1930          *
1931          * @param $action String the action to check
1932          * @param $user User to check
1933          * @param $errors Array list of current errors
1934          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1935          * @param $short Boolean short circuit on first error
1936          *
1937          * @return Array list of errors
1938          */
1939         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1940                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1941                         # We /could/ use the protection level on the source page, but it's
1942                         # fairly ugly as we have to establish a precedence hierarchy for pages
1943                         # included by multiple cascade-protected pages. So just restrict
1944                         # it to people with 'protect' permission, as they could remove the
1945                         # protection anyway.
1946                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1947                         # Cascading protection depends on more than this page...
1948                         # Several cascading protected pages may include this page...
1949                         # Check each cascading level
1950                         # This is only for protection restrictions, not for all actions
1951                         if ( isset( $restrictions[$action] ) ) {
1952                                 foreach ( $restrictions[$action] as $right ) {
1953                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1954                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1955                                                 $pages = '';
1956                                                 foreach ( $cascadingSources as $page )
1957                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1958                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1959                                         }
1960                                 }
1961                         }
1962                 }
1963
1964                 return $errors;
1965         }
1966
1967         /**
1968          * Check action permissions not already checked in checkQuickPermissions
1969          *
1970          * @param $action String the action to check
1971          * @param $user User to check
1972          * @param $errors Array list of current errors
1973          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1974          * @param $short Boolean short circuit on first error
1975          *
1976          * @return Array list of errors
1977          */
1978         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1979                 global $wgDeleteRevisionsLimit, $wgLang;
1980
1981                 if ( $action == 'protect' ) {
1982                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1983                                 // If they can't edit, they shouldn't protect.
1984                                 $errors[] = array( 'protect-cantedit' );
1985                         }
1986                 } elseif ( $action == 'create' ) {
1987                         $title_protection = $this->getTitleProtection();
1988                         if( $title_protection ) {
1989                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1990                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1991                                 }
1992                                 if( $title_protection['pt_create_perm'] == '' ||
1993                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1994                                 {
1995                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1996                                 }
1997                         }
1998                 } elseif ( $action == 'move' ) {
1999                         // Check for immobile pages
2000                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
2001                                 // Specific message for this case
2002                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2003                         } elseif ( !$this->isMovable() ) {
2004                                 // Less specific message for rarer cases
2005                                 $errors[] = array( 'immobile-source-page' );
2006                         }
2007                 } elseif ( $action == 'move-target' ) {
2008                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
2009                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
2010                         } elseif ( !$this->isMovable() ) {
2011                                 $errors[] = array( 'immobile-target-page' );
2012                         }
2013                 } elseif ( $action == 'delete' ) {
2014                         if ( $doExpensiveQueries && $wgDeleteRevisionsLimit
2015                                 && !$this->userCan( 'bigdelete', $user ) && $this->isBigDeletion() )
2016                         {
2017                                 $errors[] = array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) );
2018                         }
2019                 }
2020                 return $errors;
2021         }
2022
2023         /**
2024          * Check that the user isn't blocked from editting.
2025          *
2026          * @param $action String the action to check
2027          * @param $user User to check
2028          * @param $errors Array list of current errors
2029          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
2030          * @param $short Boolean short circuit on first error
2031          *
2032          * @return Array list of errors
2033          */
2034         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
2035                 // Account creation blocks handled at userlogin.
2036                 // Unblocking handled in SpecialUnblock
2037                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
2038                         return $errors;
2039                 }
2040
2041                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
2042
2043                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
2044                         $errors[] = array( 'confirmedittext' );
2045                 }
2046
2047                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
2048                         // Don't block the user from editing their own talk page unless they've been
2049                         // explicitly blocked from that too.
2050                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
2051                         $block = $user->getBlock();
2052
2053                         // This is from OutputPage::blockedPage
2054                         // Copied at r23888 by werdna
2055
2056                         $id = $user->blockedBy();
2057                         $reason = $user->blockedFor();
2058                         if ( $reason == '' ) {
2059                                 $reason = wfMessage( 'blockednoreason' )->text();
2060                         }
2061                         $ip = $user->getRequest()->getIP();
2062
2063                         if ( is_numeric( $id ) ) {
2064                                 $name = User::whoIs( $id );
2065                         } else {
2066                                 $name = $id;
2067                         }
2068
2069                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
2070                         $blockid = $block->getId();
2071                         $blockExpiry = $block->getExpiry();
2072                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $block->mTimestamp ), true );
2073                         if ( $blockExpiry == 'infinity' ) {
2074                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
2075                         } else {
2076                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
2077                         }
2078
2079                         $intended = strval( $block->getTarget() );
2080
2081                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
2082                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
2083                 }
2084
2085                 return $errors;
2086         }
2087
2088         /**
2089          * Check that the user is allowed to read this page.
2090          *
2091          * @param $action String the action to check
2092          * @param $user User to check
2093          * @param $errors Array list of current errors
2094          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
2095          * @param $short Boolean short circuit on first error
2096          *
2097          * @return Array list of errors
2098          */
2099         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
2100                 global $wgWhitelistRead, $wgWhitelistReadRegexp, $wgRevokePermissions;
2101                 static $useShortcut = null;
2102
2103                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
2104                 if ( is_null( $useShortcut ) ) {
2105                         $useShortcut = true;
2106                         if ( !User::groupHasPermission( '*', 'read' ) ) {
2107                                 # Not a public wiki, so no shortcut
2108                                 $useShortcut = false;
2109                         } elseif ( !empty( $wgRevokePermissions ) ) {
2110                                 /**
2111                                  * Iterate through each group with permissions being revoked (key not included since we don't care
2112                                  * what the group name is), then check if the read permission is being revoked. If it is, then
2113                                  * we don't use the shortcut below since the user might not be able to read, even though anon
2114                                  * reading is allowed.
2115                                  */
2116                                 foreach ( $wgRevokePermissions as $perms ) {
2117                                         if ( !empty( $perms['read'] ) ) {
2118                                                 # We might be removing the read right from the user, so no shortcut
2119                                                 $useShortcut = false;
2120                                                 break;
2121                                         }
2122                                 }
2123                         }
2124                 }
2125
2126                 $whitelisted = false;
2127                 if ( $useShortcut ) {
2128                         # Shortcut for public wikis, allows skipping quite a bit of code
2129                         $whitelisted = true;
2130                 } elseif ( $user->isAllowed( 'read' ) ) {
2131                         # If the user is allowed to read pages, he is allowed to read all pages
2132                         $whitelisted = true;
2133                 } elseif ( $this->isSpecial( 'Userlogin' )
2134                         || $this->isSpecial( 'ChangePassword' )
2135                         || $this->isSpecial( 'PasswordReset' )
2136                 ) {
2137                         # Always grant access to the login page.
2138                         # Even anons need to be able to log in.
2139                         $whitelisted = true;
2140                 } elseif ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2141                         # Time to check the whitelist
2142                         # Only do these checks is there's something to check against
2143                         $name = $this->getPrefixedText();
2144                         $dbName = $this->getPrefixedDBKey();
2145
2146                         // Check for explicit whitelisting with and without underscores
2147                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2148                                 $whitelisted = true;
2149                         } elseif ( $this->getNamespace() == NS_MAIN ) {
2150                                 # Old settings might have the title prefixed with
2151                                 # a colon for main-namespace pages
2152                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2153                                         $whitelisted = true;
2154                                 }
2155                         } elseif ( $this->isSpecialPage() ) {
2156                                 # If it's a special page, ditch the subpage bit and check again
2157                                 $name = $this->getDBkey();
2158                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2159                                 if ( $name ) {
2160                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2161                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2162                                                 $whitelisted = true;
2163                                         }
2164                                 }
2165                         }
2166                 }
2167
2168                 if( !$whitelisted && is_array( $wgWhitelistReadRegexp ) && !empty( $wgWhitelistReadRegexp ) ) {
2169                         $name = $this->getPrefixedText();
2170                         // Check for regex whitelisting
2171                         foreach ( $wgWhitelistReadRegexp as $listItem ) {
2172                                 if ( preg_match( $listItem, $name ) ) {
2173                                         $whitelisted = true;
2174                                         break;
2175                                 }
2176                         }
2177                 }
2178
2179                 if ( !$whitelisted ) {
2180                         # If the title is not whitelisted, give extensions a chance to do so...
2181                         wfRunHooks( 'TitleReadWhitelist', array( $this, $user, &$whitelisted ) );
2182                         if ( !$whitelisted ) {
2183                                 $errors[] = $this->missingPermissionError( $action, $short );
2184                         }
2185                 }
2186
2187                 return $errors;
2188         }
2189
2190         /**
2191          * Get a description array when the user doesn't have the right to perform
2192          * $action (i.e. when User::isAllowed() returns false)
2193          *
2194          * @param $action String the action to check
2195          * @param $short Boolean short circuit on first error
2196          * @return Array list of errors
2197          */
2198         private function missingPermissionError( $action, $short ) {
2199                 // We avoid expensive display logic for quickUserCan's and such
2200                 if ( $short ) {
2201                         return array( 'badaccess-group0' );
2202                 }
2203
2204                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2205                         User::getGroupsWithPermission( $action ) );
2206
2207                 if ( count( $groups ) ) {
2208                         global $wgLang;
2209                         return array(
2210                                 'badaccess-groups',
2211                                 $wgLang->commaList( $groups ),
2212                                 count( $groups )
2213                         );
2214                 } else {
2215                         return array( 'badaccess-group0' );
2216                 }
2217         }
2218
2219         /**
2220          * Can $user perform $action on this page? This is an internal function,
2221          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2222          * checks on wfReadOnly() and blocks)
2223          *
2224          * @param $action String action that permission needs to be checked for
2225          * @param $user User to check
2226          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2227          * @param $short Bool Set this to true to stop after the first permission error.
2228          * @return Array of arrays of the arguments to wfMessage to explain permissions problems.
2229          */
2230         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2231                 wfProfileIn( __METHOD__ );
2232
2233                 # Read has special handling
2234                 if ( $action == 'read' ) {
2235                         $checks = array(
2236                                 'checkPermissionHooks',
2237                                 'checkReadPermissions',
2238                         );
2239                 } else {
2240                         $checks = array(
2241                                 'checkQuickPermissions',
2242                                 'checkPermissionHooks',
2243                                 'checkSpecialsAndNSPermissions',
2244                                 'checkCSSandJSPermissions',
2245                                 'checkPageRestrictions',
2246                                 'checkCascadingSourcesRestrictions',
2247                                 'checkActionPermissions',
2248                                 'checkUserBlock'
2249                         );
2250                 }
2251
2252                 $errors = array();
2253                 while( count( $checks ) > 0 &&
2254                                 !( $short && count( $errors ) > 0 ) ) {
2255                         $method = array_shift( $checks );
2256                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2257                 }
2258
2259                 wfProfileOut( __METHOD__ );
2260                 return $errors;
2261         }
2262
2263         /**
2264          * Protect css subpages of user pages: can $wgUser edit
2265          * this page?
2266          *
2267          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2268          * @return Bool
2269          */
2270         public function userCanEditCssSubpage() {
2271                 global $wgUser;
2272                 wfDeprecated( __METHOD__, '1.19' );
2273                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2274                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2275         }
2276
2277         /**
2278          * Protect js subpages of user pages: can $wgUser edit
2279          * this page?
2280          *
2281          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2282          * @return Bool
2283          */
2284         public function userCanEditJsSubpage() {
2285                 global $wgUser;
2286                 wfDeprecated( __METHOD__, '1.19' );
2287                 return (
2288                         ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2289                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform )
2290                 );
2291         }
2292
2293         /**
2294          * Get a filtered list of all restriction types supported by this wiki.
2295          * @param bool $exists True to get all restriction types that apply to
2296          * titles that do exist, False for all restriction types that apply to
2297          * titles that do not exist
2298          * @return array
2299          */
2300         public static function getFilteredRestrictionTypes( $exists = true ) {
2301                 global $wgRestrictionTypes;
2302                 $types = $wgRestrictionTypes;
2303                 if ( $exists ) {
2304                         # Remove the create restriction for existing titles
2305                         $types = array_diff( $types, array( 'create' ) );
2306                 } else {
2307                         # Only the create and upload restrictions apply to non-existing titles
2308                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2309                 }
2310                 return $types;
2311         }
2312
2313         /**
2314          * Returns restriction types for the current Title
2315          *
2316          * @return array applicable restriction types
2317          */
2318         public function getRestrictionTypes() {
2319                 if ( $this->isSpecialPage() ) {
2320                         return array();
2321                 }
2322
2323                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2324
2325                 if ( $this->getNamespace() != NS_FILE ) {
2326                         # Remove the upload restriction for non-file titles
2327                         $types = array_diff( $types, array( 'upload' ) );
2328                 }
2329
2330                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2331
2332                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2333                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2334
2335                 return $types;
2336         }
2337
2338         /**
2339          * Is this title subject to title protection?
2340          * Title protection is the one applied against creation of such title.
2341          *
2342          * @return Mixed An associative array representing any existent title
2343          *   protection, or false if there's none.
2344          */
2345         private function getTitleProtection() {
2346                 // Can't protect pages in special namespaces
2347                 if ( $this->getNamespace() < 0 ) {
2348                         return false;
2349                 }
2350
2351                 // Can't protect pages that exist.
2352                 if ( $this->exists() ) {
2353                         return false;
2354                 }
2355
2356                 if ( !isset( $this->mTitleProtection ) ) {
2357                         $dbr = wfGetDB( DB_SLAVE );
2358                         $res = $dbr->select(
2359                                 'protected_titles',
2360                                 array( 'pt_user', 'pt_reason', 'pt_expiry', 'pt_create_perm' ),
2361                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2362                                 __METHOD__
2363                         );
2364
2365                         // fetchRow returns false if there are no rows.
2366                         $this->mTitleProtection = $dbr->fetchRow( $res );
2367                 }
2368                 return $this->mTitleProtection;
2369         }
2370
2371         /**
2372          * Update the title protection status
2373          *
2374          * @deprecated in 1.19; will be removed in 1.20. Use WikiPage::doUpdateRestrictions() instead.
2375          * @param $create_perm String Permission required for creation
2376          * @param $reason String Reason for protection
2377          * @param $expiry String Expiry timestamp
2378          * @return boolean true
2379          */
2380         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2381                 wfDeprecated( __METHOD__, '1.19' );
2382
2383                 global $wgUser;
2384
2385                 $limit = array( 'create' => $create_perm );
2386                 $expiry = array( 'create' => $expiry );
2387
2388                 $page = WikiPage::factory( $this );
2389                 $cascade = false;
2390                 $status = $page->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $wgUser );
2391
2392                 return $status->isOK();
2393         }
2394
2395         /**
2396          * Remove any title protection due to page existing
2397          */
2398         public function deleteTitleProtection() {
2399                 $dbw = wfGetDB( DB_MASTER );
2400
2401                 $dbw->delete(
2402                         'protected_titles',
2403                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2404                         __METHOD__
2405                 );
2406                 $this->mTitleProtection = false;
2407         }
2408
2409         /**
2410          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2411          *
2412          * @param $action String Action to check (default: edit)
2413          * @return Bool
2414          */
2415         public function isSemiProtected( $action = 'edit' ) {
2416                 if ( $this->exists() ) {
2417                         $restrictions = $this->getRestrictions( $action );
2418                         if ( count( $restrictions ) > 0 ) {
2419                                 foreach ( $restrictions as $restriction ) {
2420                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2421                                                 return false;
2422                                         }
2423                                 }
2424                         } else {
2425                                 # Not protected
2426                                 return false;
2427                         }
2428                         return true;
2429                 } else {
2430                         # If it doesn't exist, it can't be protected
2431                         return false;
2432                 }
2433         }
2434
2435         /**
2436          * Does the title correspond to a protected article?
2437          *
2438          * @param $action String the action the page is protected from,
2439          * by default checks all actions.
2440          * @return Bool
2441          */
2442         public function isProtected( $action = '' ) {
2443                 global $wgRestrictionLevels;
2444
2445                 $restrictionTypes = $this->getRestrictionTypes();
2446
2447                 # Special pages have inherent protection
2448                 if( $this->isSpecialPage() ) {
2449                         return true;
2450                 }
2451
2452                 # Check regular protection levels
2453                 foreach ( $restrictionTypes as $type ) {
2454                         if ( $action == $type || $action == '' ) {
2455                                 $r = $this->getRestrictions( $type );
2456                                 foreach ( $wgRestrictionLevels as $level ) {
2457                                         if ( in_array( $level, $r ) && $level != '' ) {
2458                                                 return true;
2459                                         }
2460                                 }
2461                         }
2462                 }
2463
2464                 return false;
2465         }
2466
2467         /**
2468          * Determines if $user is unable to edit this page because it has been protected
2469          * by $wgNamespaceProtection.
2470          *
2471          * @param $user User object to check permissions
2472          * @return Bool
2473          */
2474         public function isNamespaceProtected( User $user ) {
2475                 global $wgNamespaceProtection;
2476
2477                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2478                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2479                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2480                                         return true;
2481                                 }
2482                         }
2483                 }
2484                 return false;
2485         }
2486
2487         /**
2488          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2489          *
2490          * @return Bool If the page is subject to cascading restrictions.
2491          */
2492         public function isCascadeProtected() {
2493                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2494                 return ( $sources > 0 );
2495         }
2496
2497         /**
2498          * Cascading protection: Get the source of any cascading restrictions on this page.
2499          *
2500          * @param $getPages Bool Whether or not to retrieve the actual pages
2501          *        that the restrictions have come from.
2502          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2503          *     have come, false for none, or true if such restrictions exist, but $getPages
2504          *     was not set.  The restriction array is an array of each type, each of which
2505          *     contains a array of unique groups.
2506          */
2507         public function getCascadeProtectionSources( $getPages = true ) {
2508                 global $wgContLang;
2509                 $pagerestrictions = array();
2510
2511                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2512                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2513                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2514                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2515                 }
2516
2517                 wfProfileIn( __METHOD__ );
2518
2519                 $dbr = wfGetDB( DB_SLAVE );
2520
2521                 if ( $this->getNamespace() == NS_FILE ) {
2522                         $tables = array( 'imagelinks', 'page_restrictions' );
2523                         $where_clauses = array(
2524                                 'il_to' => $this->getDBkey(),
2525                                 'il_from=pr_page',
2526                                 'pr_cascade' => 1
2527                         );
2528                 } else {
2529                         $tables = array( 'templatelinks', 'page_restrictions' );
2530                         $where_clauses = array(
2531                                 'tl_namespace' => $this->getNamespace(),
2532                                 'tl_title' => $this->getDBkey(),
2533                                 'tl_from=pr_page',
2534                                 'pr_cascade' => 1
2535                         );
2536                 }
2537
2538                 if ( $getPages ) {
2539                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2540                                 'pr_expiry', 'pr_type', 'pr_level' );
2541                         $where_clauses[] = 'page_id=pr_page';
2542                         $tables[] = 'page';
2543                 } else {
2544                         $cols = array( 'pr_expiry' );
2545                 }
2546
2547                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2548
2549                 $sources = $getPages ? array() : false;
2550                 $now = wfTimestampNow();
2551                 $purgeExpired = false;
2552
2553                 foreach ( $res as $row ) {
2554                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2555                         if ( $expiry > $now ) {
2556                                 if ( $getPages ) {
2557                                         $page_id = $row->pr_page;
2558                                         $page_ns = $row->page_namespace;
2559                                         $page_title = $row->page_title;
2560                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2561                                         # Add groups needed for each restriction type if its not already there
2562                                         # Make sure this restriction type still exists
2563
2564                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2565                                                 $pagerestrictions[$row->pr_type] = array();
2566                                         }
2567
2568                                         if (
2569                                                 isset( $pagerestrictions[$row->pr_type] )
2570                                                 && !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] )
2571                                         ) {
2572                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2573                                         }
2574                                 } else {
2575                                         $sources = true;
2576                                 }
2577                         } else {
2578                                 // Trigger lazy purge of expired restrictions from the db
2579                                 $purgeExpired = true;
2580                         }
2581                 }
2582                 if ( $purgeExpired ) {
2583                         Title::purgeExpiredRestrictions();
2584                 }
2585
2586                 if ( $getPages ) {
2587                         $this->mCascadeSources = $sources;
2588                         $this->mCascadingRestrictions = $pagerestrictions;
2589                 } else {
2590                         $this->mHasCascadingRestrictions = $sources;
2591                 }
2592
2593                 wfProfileOut( __METHOD__ );
2594                 return array( $sources, $pagerestrictions );
2595         }
2596
2597         /**
2598          * Accessor/initialisation for mRestrictions
2599          *
2600          * @param $action String action that permission needs to be checked for
2601          * @return Array of Strings the array of groups allowed to edit this article
2602          */
2603         public function getRestrictions( $action ) {
2604                 if ( !$this->mRestrictionsLoaded ) {
2605                         $this->loadRestrictions();
2606                 }
2607                 return isset( $this->mRestrictions[$action] )
2608                                 ? $this->mRestrictions[$action]
2609                                 : array();
2610         }
2611
2612         /**
2613          * Get the expiry time for the restriction against a given action
2614          *
2615          * @param $action
2616          * @return String|Bool 14-char timestamp, or 'infinity' if the page is protected forever
2617          *     or not protected at all, or false if the action is not recognised.
2618          */
2619         public function getRestrictionExpiry( $action ) {
2620                 if ( !$this->mRestrictionsLoaded ) {
2621                         $this->loadRestrictions();
2622                 }
2623                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2624         }
2625
2626         /**
2627          * Returns cascading restrictions for the current article
2628          *
2629          * @return Boolean
2630          */
2631         function areRestrictionsCascading() {
2632                 if ( !$this->mRestrictionsLoaded ) {
2633                         $this->loadRestrictions();
2634                 }
2635
2636                 return $this->mCascadeRestriction;
2637         }
2638
2639         /**
2640          * Loads a string into mRestrictions array
2641          *
2642          * @param $res Resource restrictions as an SQL result.
2643          * @param $oldFashionedRestrictions String comma-separated list of page
2644          *        restrictions from page table (pre 1.10)
2645          */
2646         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
2647                 $rows = array();
2648
2649                 foreach ( $res as $row ) {
2650                         $rows[] = $row;
2651                 }
2652
2653                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
2654         }
2655
2656         /**
2657          * Compiles list of active page restrictions from both page table (pre 1.10)
2658          * and page_restrictions table for this existing page.
2659          * Public for usage by LiquidThreads.
2660          *
2661          * @param $rows array of db result objects
2662          * @param $oldFashionedRestrictions string comma-separated list of page
2663          *        restrictions from page table (pre 1.10)
2664          */
2665         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
2666                 global $wgContLang;
2667                 $dbr = wfGetDB( DB_SLAVE );
2668
2669                 $restrictionTypes = $this->getRestrictionTypes();
2670
2671                 foreach ( $restrictionTypes as $type ) {
2672                         $this->mRestrictions[$type] = array();
2673                         $this->mRestrictionsExpiry[$type] = $wgContLang->formatExpiry( '', TS_MW );
2674                 }
2675
2676                 $this->mCascadeRestriction = false;
2677
2678                 # Backwards-compatibility: also load the restrictions from the page record (old format).
2679
2680                 if ( $oldFashionedRestrictions === null ) {
2681                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
2682                                 array( 'page_id' => $this->getArticleID() ), __METHOD__ );
2683                 }
2684
2685                 if ( $oldFashionedRestrictions != '' ) {
2686
2687                         foreach ( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
2688                                 $temp = explode( '=', trim( $restrict ) );
2689                                 if ( count( $temp ) == 1 ) {
2690                                         // old old format should be treated as edit/move restriction
2691                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
2692                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
2693                                 } else {
2694                                         $restriction = trim( $temp[1] );
2695                                         if( $restriction != '' ) { //some old entries are empty
2696                                                 $this->mRestrictions[$temp[0]] = explode( ',', $restriction );
2697                                         }
2698                                 }
2699                         }
2700
2701                         $this->mOldRestrictions = true;
2702
2703                 }
2704
2705                 if ( count( $rows ) ) {
2706                         # Current system - load second to make them override.
2707                         $now = wfTimestampNow();
2708                         $purgeExpired = false;
2709
2710                         # Cycle through all the restrictions.
2711                         foreach ( $rows as $row ) {
2712
2713                                 // Don't take care of restrictions types that aren't allowed
2714                                 if ( !in_array( $row->pr_type, $restrictionTypes ) )
2715                                         continue;
2716
2717                                 // This code should be refactored, now that it's being used more generally,
2718                                 // But I don't really see any harm in leaving it in Block for now -werdna
2719                                 $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2720
2721                                 // Only apply the restrictions if they haven't expired!
2722                                 if ( !$expiry || $expiry > $now ) {
2723                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
2724                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
2725
2726                                         $this->mCascadeRestriction |= $row->pr_cascade;
2727                                 } else {
2728                                         // Trigger a lazy purge of expired restrictions
2729                                         $purgeExpired = true;
2730                                 }
2731                         }
2732
2733                         if ( $purgeExpired ) {
2734                                 Title::purgeExpiredRestrictions();
2735                         }
2736                 }
2737
2738                 $this->mRestrictionsLoaded = true;
2739         }
2740
2741         /**
2742          * Load restrictions from the page_restrictions table
2743          *
2744          * @param $oldFashionedRestrictions String comma-separated list of page
2745          *        restrictions from page table (pre 1.10)
2746          */
2747         public function loadRestrictions( $oldFashionedRestrictions = null ) {
2748                 global $wgContLang;
2749                 if ( !$this->mRestrictionsLoaded ) {
2750                         if ( $this->exists() ) {
2751                                 $dbr = wfGetDB( DB_SLAVE );
2752
2753                                 $res = $dbr->select(
2754                                         'page_restrictions',
2755                                         array( 'pr_type', 'pr_expiry', 'pr_level', 'pr_cascade' ),
2756                                         array( 'pr_page' => $this->getArticleID() ),
2757                                         __METHOD__
2758                                 );
2759
2760                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2761                         } else {
2762                                 $title_protection = $this->getTitleProtection();
2763
2764                                 if ( $title_protection ) {
2765                                         $now = wfTimestampNow();
2766                                         $expiry = $wgContLang->formatExpiry( $title_protection['pt_expiry'], TS_MW );
2767
2768                                         if ( !$expiry || $expiry > $now ) {
2769                                                 // Apply the restrictions
2770                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2771                                                 $this->mRestrictions['create'] = explode( ',', trim( $title_protection['pt_create_perm'] ) );
2772                                         } else { // Get rid of the old restrictions
2773                                                 Title::purgeExpiredRestrictions();
2774                                                 $this->mTitleProtection = false;
2775                                         }
2776                                 } else {
2777                                         $this->mRestrictionsExpiry['create'] = $wgContLang->formatExpiry( '', TS_MW );
2778                                 }
2779                                 $this->mRestrictionsLoaded = true;
2780                         }
2781                 }
2782         }
2783
2784         /**
2785          * Flush the protection cache in this object and force reload from the database.
2786          * This is used when updating protection from WikiPage::doUpdateRestrictions().
2787          */
2788         public function flushRestrictions() {
2789                 $this->mRestrictionsLoaded = false;
2790                 $this->mTitleProtection = null;
2791         }
2792
2793         /**
2794          * Purge expired restrictions from the page_restrictions table
2795          */
2796         static function purgeExpiredRestrictions() {
2797                 if ( wfReadOnly() ) {
2798                         return;
2799                 }
2800
2801                 $dbw = wfGetDB( DB_MASTER );
2802                 $dbw->delete(
2803                         'page_restrictions',
2804                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2805                         __METHOD__
2806                 );
2807
2808                 $dbw->delete(
2809                         'protected_titles',
2810                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2811                         __METHOD__
2812                 );
2813         }
2814
2815         /**
2816          * Does this have subpages?  (Warning, usually requires an extra DB query.)
2817          *
2818          * @return Bool
2819          */
2820         public function hasSubpages() {
2821                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
2822                         # Duh
2823                         return false;
2824                 }
2825
2826                 # We dynamically add a member variable for the purpose of this method
2827                 # alone to cache the result.  There's no point in having it hanging
2828                 # around uninitialized in every Title object; therefore we only add it
2829                 # if needed and don't declare it statically.
2830                 if ( isset( $this->mHasSubpages ) ) {
2831                         return $this->mHasSubpages;
2832                 }
2833
2834                 $subpages = $this->getSubpages( 1 );
2835                 if ( $subpages instanceof TitleArray ) {
2836                         return $this->mHasSubpages = (bool)$subpages->count();
2837                 }
2838                 return $this->mHasSubpages = false;
2839         }
2840
2841         /**
2842          * Get all subpages of this page.
2843          *
2844          * @param $limit Int maximum number of subpages to fetch; -1 for no limit
2845          * @return mixed TitleArray, or empty array if this page's namespace
2846          *  doesn't allow subpages
2847          */
2848         public function getSubpages( $limit = -1 ) {
2849                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
2850                         return array();
2851                 }
2852
2853                 $dbr = wfGetDB( DB_SLAVE );
2854                 $conds['page_namespace'] = $this->getNamespace();
2855                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
2856                 $options = array();
2857                 if ( $limit > -1 ) {
2858                         $options['LIMIT'] = $limit;
2859                 }
2860                 return $this->mSubpages = TitleArray::newFromResult(
2861                         $dbr->select( 'page',
2862                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
2863                                 $conds,
2864                                 __METHOD__,
2865                                 $options
2866                         )
2867                 );
2868         }
2869
2870         /**
2871          * Is there a version of this page in the deletion archive?
2872          *
2873          * @return Int the number of archived revisions
2874          */
2875         public function isDeleted() {
2876                 if ( $this->getNamespace() < 0 ) {
2877                         $n = 0;
2878                 } else {
2879                         $dbr = wfGetDB( DB_SLAVE );
2880
2881                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2882                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2883                                 __METHOD__
2884                         );
2885                         if ( $this->getNamespace() == NS_FILE ) {
2886                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2887                                         array( 'fa_name' => $this->getDBkey() ),
2888                                         __METHOD__
2889                                 );
2890                         }
2891                 }
2892                 return (int)$n;
2893         }
2894
2895         /**
2896          * Is there a version of this page in the deletion archive?
2897          *
2898          * @return Boolean
2899          */
2900         public function isDeletedQuick() {
2901                 if ( $this->getNamespace() < 0 ) {
2902                         return false;
2903                 }
2904                 $dbr = wfGetDB( DB_SLAVE );
2905                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2906                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2907                         __METHOD__
2908                 );
2909                 if ( !$deleted && $this->getNamespace() == NS_FILE ) {
2910                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2911                                 array( 'fa_name' => $this->getDBkey() ),
2912                                 __METHOD__
2913                         );
2914                 }
2915                 return $deleted;
2916         }
2917
2918         /**
2919          * Get the article ID for this Title from the link cache,
2920          * adding it if necessary
2921          *
2922          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select
2923          *  for update
2924          * @return Int the ID
2925          */
2926         public function getArticleID( $flags = 0 ) {
2927                 if ( $this->getNamespace() < 0 ) {
2928                         return $this->mArticleID = 0;
2929                 }
2930                 $linkCache = LinkCache::singleton();
2931                 if ( $flags & self::GAID_FOR_UPDATE ) {
2932                         $oldUpdate = $linkCache->forUpdate( true );
2933                         $linkCache->clearLink( $this );
2934                         $this->mArticleID = $linkCache->addLinkObj( $this );
2935                         $linkCache->forUpdate( $oldUpdate );
2936                 } else {
2937                         if ( -1 == $this->mArticleID ) {
2938                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2939                         }
2940                 }
2941                 return $this->mArticleID;
2942         }
2943
2944         /**
2945          * Is this an article that is a redirect page?
2946          * Uses link cache, adding it if necessary
2947          *
2948          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2949          * @return Bool
2950          */
2951         public function isRedirect( $flags = 0 ) {
2952                 if ( !( $flags & Title::GAID_FOR_UPDATE ) && !is_null( $this->mRedirect ) ) {
2953                         return $this->mRedirect;
2954                 }
2955
2956                 if ( !$this->getArticleID( $flags ) ) {
2957                         return $this->mRedirect = false;
2958                 }
2959
2960                 $linkCache = LinkCache::singleton();
2961                 $linkCache->addLinkObj( $this );
2962                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2963
2964                 if ( $cached === null ) {
2965                         // Should not happen
2966                         throw new MWException( "LinkCache doesn't know redirect status of this title: " . $this->getPrefixedDBkey() );
2967                 }
2968
2969                 $this->mRedirect = (bool)$cached;
2970
2971                 return $this->mRedirect;
2972         }
2973
2974         /**
2975          * What is the length of this page?
2976          * Uses link cache, adding it if necessary
2977          *
2978          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2979          * @return Int
2980          */
2981         public function getLength( $flags = 0 ) {
2982                 if ( !( $flags & Title::GAID_FOR_UPDATE ) && $this->mLength != -1 ) {
2983                         return $this->mLength;
2984                 }
2985
2986                 if ( !$this->getArticleID( $flags ) ) {
2987                         return $this->mLength = 0;
2988                 }
2989
2990                 $linkCache = LinkCache::singleton();
2991                 $linkCache->addLinkObj( $this );
2992                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'length' );
2993
2994                 if ( $cached === null ) {
2995                         // Should not happen
2996                         throw new MWException( "LinkCache doesn't know redirect status of this title: " . $this->getPrefixedDBkey() );
2997                 }
2998
2999                 $this->mLength = intval( $cached );
3000
3001                 return $this->mLength;
3002         }
3003
3004         /**
3005          * What is the page_latest field for this page?
3006          *
3007          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
3008          * @throws MWException
3009          * @return Int or 0 if the page doesn't exist
3010          */
3011         public function getLatestRevID( $flags = 0 ) {
3012                 if ( !( $flags & Title::GAID_FOR_UPDATE ) && $this->mLatestID !== false ) {
3013                         return intval( $this->mLatestID );
3014                 }
3015
3016                 if ( !$this->getArticleID( $flags ) ) {
3017                         return $this->mLatestID = 0;
3018                 }
3019
3020                 $linkCache = LinkCache::singleton();
3021                 $linkCache->addLinkObj( $this );
3022                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'revision' );
3023
3024                 if ( $cached === null ) {
3025                         // Should not happen
3026                         throw new MWException( "LinkCache doesn't know latest revision ID of this title: " . $this->getPrefixedDBkey() );
3027                 }
3028
3029                 $this->mLatestID = intval( $cached );
3030
3031                 return $this->mLatestID;
3032         }
3033
3034         /**
3035          * This clears some fields in this object, and clears any associated
3036          * keys in the "bad links" section of the link cache.
3037          *
3038          * - This is called from WikiPage::doEdit() and WikiPage::insertOn() to allow
3039          * loading of the new page_id. It's also called from
3040          * WikiPage::doDeleteArticleReal()
3041          *
3042          * @param $newid Int the new Article ID
3043          */
3044         public function resetArticleID( $newid ) {
3045                 $linkCache = LinkCache::singleton();
3046                 $linkCache->clearLink( $this );
3047
3048                 if ( $newid === false ) {
3049                         $this->mArticleID = -1;
3050                 } else {
3051                         $this->mArticleID = intval( $newid );
3052                 }
3053                 $this->mRestrictionsLoaded = false;
3054                 $this->mRestrictions = array();
3055                 $this->mRedirect = null;
3056                 $this->mLength = -1;
3057                 $this->mLatestID = false;
3058                 $this->mContentModel = false;
3059                 $this->mEstimateRevisions = null;
3060         }
3061
3062         /**
3063          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
3064          *
3065          * @param $text String containing title to capitalize
3066          * @param $ns int namespace index, defaults to NS_MAIN
3067          * @return String containing capitalized title
3068          */
3069         public static function capitalize( $text, $ns = NS_MAIN ) {
3070                 global $wgContLang;
3071
3072                 if ( MWNamespace::isCapitalized( $ns ) ) {
3073                         return $wgContLang->ucfirst( $text );
3074                 } else {
3075                         return $text;
3076                 }
3077         }
3078
3079         /**
3080          * Secure and split - main initialisation function for this object
3081          *
3082          * Assumes that mDbkeyform has been set, and is urldecoded
3083          * and uses underscores, but not otherwise munged.  This function
3084          * removes illegal characters, splits off the interwiki and
3085          * namespace prefixes, sets the other forms, and canonicalizes
3086          * everything.
3087          *
3088          * @return Bool true on success
3089          */
3090         private function secureAndSplit() {
3091                 global $wgContLang, $wgLocalInterwiki;
3092
3093                 # Initialisation
3094                 $this->mInterwiki = $this->mFragment = '';
3095                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
3096
3097                 $dbkey = $this->mDbkeyform;
3098
3099                 # Strip Unicode bidi override characters.
3100                 # Sometimes they slip into cut-n-pasted page titles, where the
3101                 # override chars get included in list displays.
3102                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
3103
3104                 # Clean up whitespace
3105                 # Note: use of the /u option on preg_replace here will cause
3106                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
3107                 # conveniently disabling them.
3108                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
3109                 $dbkey = trim( $dbkey, '_' );
3110
3111                 if ( $dbkey == '' ) {
3112                         return false;
3113                 }
3114
3115                 if ( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
3116                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
3117                         return false;
3118                 }
3119
3120                 $this->mDbkeyform = $dbkey;
3121
3122                 # Initial colon indicates main namespace rather than specified default
3123                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
3124                 if ( ':' == $dbkey[0] ) {
3125                         $this->mNamespace = NS_MAIN;
3126                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
3127                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
3128                 }
3129
3130                 # Namespace or interwiki prefix
3131                 $firstPass = true;
3132                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
3133                 do {
3134                         $m = array();
3135                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
3136                                 $p = $m[1];
3137                                 if ( ( $ns = $wgContLang->getNsIndex( $p ) ) !== false ) {
3138                                         # Ordinary namespace
3139                                         $dbkey = $m[2];
3140                                         $this->mNamespace = $ns;
3141                                         # For Talk:X pages, check if X has a "namespace" prefix
3142                                         if ( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
3143                                                 if ( $wgContLang->getNsIndex( $x[1] ) ) {
3144                                                         # Disallow Talk:File:x type titles...
3145                                                         return false;
3146                                                 } elseif ( Interwiki::isValidInterwiki( $x[1] ) ) {
3147                                                         # Disallow Talk:Interwiki:x type titles...
3148                                                         return false;
3149                                                 }
3150                                         }
3151                                 } elseif ( Interwiki::isValidInterwiki( $p ) ) {
3152                                         if ( !$firstPass ) {
3153                                                 # Can't make a local interwiki link to an interwiki link.
3154                                                 # That's just crazy!
3155                                                 return false;
3156                                         }
3157
3158                                         # Interwiki link
3159                                         $dbkey = $m[2];
3160                                         $this->mInterwiki = $wgContLang->lc( $p );
3161
3162                                         # Redundant interwiki prefix to the local wiki
3163                                         if ( $wgLocalInterwiki !== false
3164                                                 && 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) )
3165                                         {
3166                                                 if ( $dbkey == '' ) {
3167                                                         # Can't have an empty self-link
3168                                                         return false;
3169                                                 }
3170                                                 $this->mInterwiki = '';
3171                                                 $firstPass = false;
3172                                                 # Do another namespace split...
3173                                                 continue;
3174                                         }
3175
3176                                         # If there's an initial colon after the interwiki, that also
3177                                         # resets the default namespace
3178                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
3179                                                 $this->mNamespace = NS_MAIN;
3180                                                 $dbkey = substr( $dbkey, 1 );
3181                                         }
3182                                 }
3183                                 # If there's no recognized interwiki or namespace,
3184                                 # then let the colon expression be part of the title.
3185                         }
3186                         break;
3187                 } while ( true );
3188
3189                 # We already know that some pages won't be in the database!
3190                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
3191                         $this->mArticleID = 0;
3192                 }
3193                 $fragment = strstr( $dbkey, '#' );
3194                 if ( false !== $fragment ) {
3195                         $this->setFragment( $fragment );
3196                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
3197                         # remove whitespace again: prevents "Foo_bar_#"
3198                         # becoming "Foo_bar_"
3199                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
3200                 }
3201
3202                 # Reject illegal characters.
3203                 $rxTc = self::getTitleInvalidRegex();
3204                 if ( preg_match( $rxTc, $dbkey ) ) {
3205                         return false;
3206                 }
3207
3208                 # Pages with "/./" or "/../" appearing in the URLs will often be un-
3209                 # reachable due to the way web browsers deal with 'relative' URLs.
3210                 # Also, they conflict with subpage syntax.  Forbid them explicitly.
3211                 if (
3212                         strpos( $dbkey, '.' ) !== false &&
3213                         (
3214                                 $dbkey === '.' || $dbkey === '..' ||
3215                                 strpos( $dbkey, './' ) === 0  ||
3216                                 strpos( $dbkey, '../' ) === 0 ||
3217                                 strpos( $dbkey, '/./' ) !== false ||
3218                                 strpos( $dbkey, '/../' ) !== false  ||
3219                                 substr( $dbkey, -2 ) == '/.' ||
3220                                 substr( $dbkey, -3 ) == '/..'
3221                         )
3222                 ) {
3223                         return false;
3224                 }
3225
3226                 # Magic tilde sequences? Nu-uh!
3227                 if ( strpos( $dbkey, '~~~' ) !== false ) {
3228                         return false;
3229                 }
3230
3231                 # Limit the size of titles to 255 bytes. This is typically the size of the
3232                 # underlying database field. We make an exception for special pages, which
3233                 # don't need to be stored in the database, and may edge over 255 bytes due
3234                 # to subpage syntax for long titles, e.g. [[Special:Block/Long name]]
3235                 if (
3236                         ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 )
3237                         || strlen( $dbkey ) > 512
3238                 ) {
3239                         return false;
3240                 }
3241
3242                 # Normally, all wiki links are forced to have an initial capital letter so [[foo]]
3243                 # and [[Foo]] point to the same place.  Don't force it for interwikis, since the
3244                 # other site might be case-sensitive.
3245                 $this->mUserCaseDBKey = $dbkey;
3246                 if ( $this->mInterwiki == '' ) {
3247                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
3248                 }
3249
3250                 # Can't make a link to a namespace alone... "empty" local links can only be
3251                 # self-links with a fragment identifier.
3252                 if ( $dbkey == '' && $this->mInterwiki == '' && $this->mNamespace != NS_MAIN ) {
3253                         return false;
3254                 }
3255
3256                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
3257                 // IP names are not allowed for accounts, and can only be referring to
3258                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
3259                 // there are numerous ways to present the same IP. Having sp:contribs scan
3260                 // them all is silly and having some show the edits and others not is
3261                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
3262                 $dbkey = ( $this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK )
3263                         ? IP::sanitizeIP( $dbkey )
3264                         : $dbkey;
3265
3266                 // Any remaining initial :s are illegal.
3267                 if ( $dbkey !== '' && ':' == $dbkey[0] ) {
3268                         return false;
3269                 }
3270
3271                 # Fill fields
3272                 $this->mDbkeyform = $dbkey;
3273                 $this->mUrlform = wfUrlencode( $dbkey );
3274
3275                 $this->mTextform = str_replace( '_', ' ', $dbkey );
3276
3277                 return true;
3278         }
3279
3280         /**
3281          * Get an array of Title objects linking to this Title
3282          * Also stores the IDs in the link cache.
3283          *
3284          * WARNING: do not use this function on arbitrary user-supplied titles!
3285          * On heavily-used templates it will max out the memory.
3286          *
3287          * @param $options Array: may be FOR UPDATE
3288          * @param $table String: table name
3289          * @param $prefix String: fields prefix
3290          * @return Array of Title objects linking here
3291          */
3292         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3293                 if ( count( $options ) > 0 ) {
3294                         $db = wfGetDB( DB_MASTER );
3295                 } else {
3296                         $db = wfGetDB( DB_SLAVE );
3297                 }
3298
3299                 $res = $db->select(
3300                         array( 'page', $table ),
3301                         self::getSelectFields(),
3302                         array(
3303                                 "{$prefix}_from=page_id",
3304                                 "{$prefix}_namespace" => $this->getNamespace(),
3305                                 "{$prefix}_title"     => $this->getDBkey() ),
3306                         __METHOD__,
3307                         $options
3308                 );
3309
3310                 $retVal = array();
3311                 if ( $res->numRows() ) {
3312                         $linkCache = LinkCache::singleton();
3313                         foreach ( $res as $row ) {
3314                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
3315                                 if ( $titleObj ) {
3316                                         $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3317                                         $retVal[] = $titleObj;
3318                                 }
3319                         }
3320                 }
3321                 return $retVal;
3322         }
3323
3324         /**
3325          * Get an array of Title objects using this Title as a template
3326          * Also stores the IDs in the link cache.
3327          *
3328          * WARNING: do not use this function on arbitrary user-supplied titles!
3329          * On heavily-used templates it will max out the memory.
3330          *
3331          * @param $options Array: may be FOR UPDATE
3332          * @return Array of Title the Title objects linking here
3333          */
3334         public function getTemplateLinksTo( $options = array() ) {
3335                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
3336         }
3337
3338         /**
3339          * Get an array of Title objects linked from this Title
3340          * Also stores the IDs in the link cache.
3341          *
3342          * WARNING: do not use this function on arbitrary user-supplied titles!
3343          * On heavily-used templates it will max out the memory.
3344          *
3345          * @param $options Array: may be FOR UPDATE
3346          * @param $table String: table name
3347          * @param $prefix String: fields prefix
3348          * @return Array of Title objects linking here
3349          */
3350         public function getLinksFrom( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3351                 global $wgContentHandlerUseDB;
3352
3353                 $id = $this->getArticleID();
3354
3355                 # If the page doesn't exist; there can't be any link from this page
3356                 if ( !$id ) {
3357                         return array();
3358                 }
3359
3360                 if ( count( $options ) > 0 ) {
3361                         $db = wfGetDB( DB_MASTER );
3362                 } else {
3363                         $db = wfGetDB( DB_SLAVE );
3364                 }
3365
3366                 $namespaceFiled = "{$prefix}_namespace";
3367                 $titleField = "{$prefix}_title";
3368
3369                 $fields = array( $namespaceFiled, $titleField, 'page_id', 'page_len', 'page_is_redirect', 'page_latest' );
3370                 if ( $wgContentHandlerUseDB ) $fields[] = 'page_content_model';
3371
3372                 $res = $db->select(
3373                         array( $table, 'page' ),
3374                         $fields,
3375                         array( "{$prefix}_from" => $id ),
3376                         __METHOD__,
3377                         $options,
3378                         array( 'page' => array( 'LEFT JOIN', array( "page_namespace=$namespaceFiled", "page_title=$titleField" ) ) )
3379                 );
3380
3381                 $retVal = array();
3382                 if ( $res->numRows() ) {
3383                         $linkCache = LinkCache::singleton();
3384                         foreach ( $res as $row ) {
3385                                 $titleObj = Title::makeTitle( $row->$namespaceFiled, $row->$titleField );
3386                                 if ( $titleObj ) {
3387                                         if ( $row->page_id ) {
3388                                                 $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3389                                         } else {
3390                                                 $linkCache->addBadLinkObj( $titleObj );
3391                                         }
3392                                         $retVal[] = $titleObj;
3393                                 }
3394                         }
3395                 }
3396                 return $retVal;
3397         }
3398
3399         /**
3400          * Get an array of Title objects used on this Title as a template
3401          * Also stores the IDs in the link cache.
3402          *
3403          * WARNING: do not use this function on arbitrary user-supplied titles!
3404          * On heavily-used templates it will max out the memory.
3405          *
3406          * @param $options Array: may be FOR UPDATE
3407          * @return Array of Title the Title objects used here
3408          */
3409         public function getTemplateLinksFrom( $options = array() ) {
3410                 return $this->getLinksFrom( $options, 'templatelinks', 'tl' );
3411         }
3412
3413         /**
3414          * Get an array of Title objects referring to non-existent articles linked from this page
3415          *
3416          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
3417          * @return Array of Title the Title objects
3418          */
3419         public function getBrokenLinksFrom() {
3420                 if ( $this->getArticleID() == 0 ) {
3421                         # All links from article ID 0 are false positives
3422                         return array();
3423                 }
3424
3425                 $dbr = wfGetDB( DB_SLAVE );
3426                 $res = $dbr->select(
3427                         array( 'page', 'pagelinks' ),
3428                         array( 'pl_namespace', 'pl_title' ),
3429                         array(
3430                                 'pl_from' => $this->getArticleID(),
3431                                 'page_namespace IS NULL'
3432                         ),
3433                         __METHOD__, array(),
3434                         array(
3435                                 'page' => array(
3436                                         'LEFT JOIN',
3437                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
3438                                 )
3439                         )
3440                 );
3441
3442                 $retVal = array();
3443                 foreach ( $res as $row ) {
3444                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
3445                 }
3446                 return $retVal;
3447         }
3448
3449
3450         /**
3451          * Get a list of URLs to purge from the Squid cache when this
3452          * page changes
3453          *
3454          * @return Array of String the URLs
3455          */
3456         public function getSquidURLs() {
3457                 $urls = array(
3458                         $this->getInternalURL(),
3459                         $this->getInternalURL( 'action=history' )
3460                 );
3461
3462                 $pageLang = $this->getPageLanguage();
3463                 if ( $pageLang->hasVariants() ) {
3464                         $variants = $pageLang->getVariants();
3465                         foreach ( $variants as $vCode ) {
3466                                 $urls[] = $this->getInternalURL( '', $vCode );
3467                         }
3468                 }
3469
3470                 return $urls;
3471         }
3472
3473         /**
3474          * Purge all applicable Squid URLs
3475          */
3476         public function purgeSquid() {
3477                 global $wgUseSquid;
3478                 if ( $wgUseSquid ) {
3479                         $urls = $this->getSquidURLs();
3480                         $u = new SquidUpdate( $urls );
3481                         $u->doUpdate();
3482                 }
3483         }
3484
3485         /**
3486          * Move this page without authentication
3487          *
3488          * @param $nt Title the new page Title
3489          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3490          */
3491         public function moveNoAuth( &$nt ) {
3492                 return $this->moveTo( $nt, false );
3493         }
3494
3495         /**
3496          * Check whether a given move operation would be valid.
3497          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
3498          *
3499          * @param $nt Title the new title
3500          * @param $auth Bool indicates whether $wgUser's permissions
3501          *  should be checked
3502          * @param $reason String is the log summary of the move, used for spam checking
3503          * @return Mixed True on success, getUserPermissionsErrors()-like array on failure
3504          */
3505         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
3506                 global $wgUser, $wgContentHandlerUseDB;
3507
3508                 $errors = array();
3509                 if ( !$nt ) {
3510                         // Normally we'd add this to $errors, but we'll get
3511                         // lots of syntax errors if $nt is not an object
3512                         return array( array( 'badtitletext' ) );
3513                 }
3514                 if ( $this->equals( $nt ) ) {
3515                         $errors[] = array( 'selfmove' );
3516                 }
3517                 if ( !$this->isMovable() ) {
3518                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
3519                 }
3520                 if ( $nt->getInterwiki() != '' ) {
3521                         $errors[] = array( 'immobile-target-namespace-iw' );
3522                 }
3523                 if ( !$nt->isMovable() ) {
3524                         $errors[] = array( 'immobile-target-namespace', $nt->getNsText() );
3525                 }
3526
3527                 $oldid = $this->getArticleID();
3528                 $newid = $nt->getArticleID();
3529
3530                 if ( strlen( $nt->getDBkey() ) < 1 ) {
3531                         $errors[] = array( 'articleexists' );
3532                 }
3533                 if (
3534                         ( $this->getDBkey() == '' ) ||
3535                         ( !$oldid ) ||
3536                         ( $nt->getDBkey() == '' )
3537                 ) {
3538                         $errors[] = array( 'badarticleerror' );
3539                 }
3540
3541                 // Content model checks
3542                 if ( !$wgContentHandlerUseDB &&
3543                                 $this->getContentModel() !== $nt->getContentModel() ) {
3544                         // can't move a page if that would change the page's content model
3545                         $errors[] = array(
3546                                 'bad-target-model',
3547                                 ContentHandler::getLocalizedName( $this->getContentModel() ),
3548                                 ContentHandler::getLocalizedName( $nt->getContentModel() )
3549                         );
3550                 }
3551
3552                 // Image-specific checks
3553                 if ( $this->getNamespace() == NS_FILE ) {
3554                         $errors = array_merge( $errors, $this->validateFileMoveOperation( $nt ) );
3555                 }
3556
3557                 if ( $nt->getNamespace() == NS_FILE && $this->getNamespace() != NS_FILE ) {
3558                         $errors[] = array( 'nonfile-cannot-move-to-file' );
3559                 }
3560
3561                 if ( $auth ) {
3562                         $errors = wfMergeErrorArrays( $errors,
3563                                 $this->getUserPermissionsErrors( 'move', $wgUser ),
3564                                 $this->getUserPermissionsErrors( 'edit', $wgUser ),
3565                                 $nt->getUserPermissionsErrors( 'move-target', $wgUser ),
3566                                 $nt->getUserPermissionsErrors( 'edit', $wgUser ) );
3567                 }
3568
3569                 $match = EditPage::matchSummarySpamRegex( $reason );
3570                 if ( $match !== false ) {
3571                         // This is kind of lame, won't display nice
3572                         $errors[] = array( 'spamprotectiontext' );
3573                 }
3574
3575                 $err = null;
3576                 if ( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
3577                         $errors[] = array( 'hookaborted', $err );
3578                 }
3579
3580                 # The move is allowed only if (1) the target doesn't exist, or
3581                 # (2) the target is a redirect to the source, and has no history
3582                 # (so we can undo bad moves right after they're done).
3583
3584                 if ( 0 != $newid ) { # Target exists; check for validity
3585                         if ( !$this->isValidMoveTarget( $nt ) ) {
3586                                 $errors[] = array( 'articleexists' );
3587                         }
3588                 } else {
3589                         $tp = $nt->getTitleProtection();
3590                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
3591                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
3592                                 $errors[] = array( 'cantmove-titleprotected' );
3593                         }
3594                 }
3595                 if ( empty( $errors ) ) {
3596                         return true;
3597                 }
3598                 return $errors;
3599         }
3600
3601         /**
3602          * Check if the requested move target is a valid file move target
3603          * @param Title $nt Target title
3604          * @return array List of errors
3605          */
3606         protected function validateFileMoveOperation( $nt ) {
3607                 global $wgUser;
3608
3609                 $errors = array();
3610
3611                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is not allowed until below
3612
3613                 $file = wfLocalFile( $this );
3614                 if ( $file->exists() ) {
3615                         if ( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
3616                                 $errors[] = array( 'imageinvalidfilename' );
3617                         }
3618                         if ( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
3619                                 $errors[] = array( 'imagetypemismatch' );
3620                         }
3621                 }
3622
3623                 if ( $nt->getNamespace() != NS_FILE ) {
3624                         $errors[] = array( 'imagenocrossnamespace' );
3625                         // From here we want to do checks on a file object, so if we can't
3626                         // create one, we must return.
3627                         return $errors;
3628                 }
3629
3630                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is allowed below here
3631
3632                 $destFile = wfLocalFile( $nt );
3633                 if ( !$wgUser->isAllowed( 'reupload-shared' ) && !$destFile->exists() && wfFindFile( $nt ) ) {
3634                         $errors[] = array( 'file-exists-sharedrepo' );
3635                 }
3636
3637                 return $errors;
3638         }
3639
3640         /**
3641          * Move a title to a new location
3642          *
3643          * @param $nt Title the new title
3644          * @param $auth Bool indicates whether $wgUser's permissions
3645          *  should be checked
3646          * @param $reason String the reason for the move
3647          * @param $createRedirect Bool Whether to create a redirect from the old title to the new title.
3648          *  Ignored if the user doesn't have the suppressredirect right.
3649          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3650          */
3651         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
3652                 global $wgUser;
3653                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
3654                 if ( is_array( $err ) ) {
3655                         // Auto-block user's IP if the account was "hard" blocked
3656                         $wgUser->spreadAnyEditBlock();
3657                         return $err;
3658                 }
3659                 // Check suppressredirect permission
3660                 if ( $auth && !$wgUser->isAllowed( 'suppressredirect' ) ) {
3661                         $createRedirect = true;
3662                 }
3663
3664                 // If it is a file, move it first.
3665                 // It is done before all other moving stuff is done because it's hard to revert.
3666                 $dbw = wfGetDB( DB_MASTER );
3667                 if ( $this->getNamespace() == NS_FILE ) {
3668                         $file = wfLocalFile( $this );
3669                         if ( $file->exists() ) {
3670                                 $status = $file->move( $nt );
3671                                 if ( !$status->isOk() ) {
3672                                         return $status->getErrorsArray();
3673                                 }
3674                         }
3675                         // Clear RepoGroup process cache
3676                         RepoGroup::singleton()->clearCache( $this );
3677                         RepoGroup::singleton()->clearCache( $nt ); # clear false negative cache
3678                 }
3679
3680                 $dbw->begin( __METHOD__ ); # If $file was a LocalFile, its transaction would have closed our own.
3681                 $pageid = $this->getArticleID( self::GAID_FOR_UPDATE );
3682                 $protected = $this->isProtected();
3683
3684                 // Do the actual move
3685                 $this->moveToInternal( $nt, $reason, $createRedirect );
3686
3687                 // Refresh the sortkey for this row.  Be careful to avoid resetting
3688                 // cl_timestamp, which may disturb time-based lists on some sites.
3689                 $prefixes = $dbw->select(
3690                         'categorylinks',
3691                         array( 'cl_sortkey_prefix', 'cl_to' ),
3692                         array( 'cl_from' => $pageid ),
3693                         __METHOD__
3694                 );
3695                 foreach ( $prefixes as $prefixRow ) {
3696                         $prefix = $prefixRow->cl_sortkey_prefix;
3697                         $catTo = $prefixRow->cl_to;
3698                         $dbw->update( 'categorylinks',
3699                                 array(
3700                                         'cl_sortkey' => Collation::singleton()->getSortKey(
3701                                                 $nt->getCategorySortkey( $prefix ) ),
3702                                         'cl_timestamp=cl_timestamp' ),
3703                                 array(
3704                                         'cl_from' => $pageid,
3705                                         'cl_to' => $catTo ),
3706                                 __METHOD__
3707                         );
3708                 }
3709
3710                 $redirid = $this->getArticleID();
3711
3712                 if ( $protected ) {
3713                         # Protect the redirect title as the title used to be...
3714                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
3715                                 array(
3716                                         'pr_page'    => $redirid,
3717                                         'pr_type'    => 'pr_type',
3718                                         'pr_level'   => 'pr_level',
3719                                         'pr_cascade' => 'pr_cascade',
3720                                         'pr_user'    => 'pr_user',
3721                                         'pr_expiry'  => 'pr_expiry'
3722                                 ),
3723                                 array( 'pr_page' => $pageid ),
3724                                 __METHOD__,
3725                                 array( 'IGNORE' )
3726                         );
3727                         # Update the protection log
3728                         $log = new LogPage( 'protect' );
3729                         $comment = wfMessage(
3730                                 'prot_1movedto2',
3731                                 $this->getPrefixedText(),
3732                                 $nt->getPrefixedText()
3733                         )->inContentLanguage()->text();
3734                         if ( $reason ) {
3735                                 $comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
3736                         }
3737                         // @todo FIXME: $params?
3738                         $log->addEntry( 'move_prot', $nt, $comment, array( $this->getPrefixedText() ) );
3739                 }
3740
3741                 # Update watchlists
3742                 $oldnamespace = MWNamespace::getSubject( $this->getNamespace() );
3743                 $newnamespace = MWNamespace::getSubject( $nt->getNamespace() );
3744                 $oldtitle = $this->getDBkey();
3745                 $newtitle = $nt->getDBkey();
3746
3747                 if ( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
3748                         WatchedItem::duplicateEntries( $this, $nt );
3749                 }
3750
3751                 $dbw->commit( __METHOD__ );
3752
3753                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
3754                 return true;
3755         }
3756
3757         /**
3758          * Move page to a title which is either a redirect to the
3759          * source page or nonexistent
3760          *
3761          * @param $nt Title the page to move to, which should be a redirect or nonexistent
3762          * @param $reason String The reason for the move
3763          * @param $createRedirect Bool Whether to leave a redirect at the old title. Does not check
3764          *   if the user has the suppressredirect right
3765          * @throws MWException
3766          */
3767         private function moveToInternal( &$nt, $reason = '', $createRedirect = true ) {
3768                 global $wgUser, $wgContLang;
3769
3770                 if ( $nt->exists() ) {
3771                         $moveOverRedirect = true;
3772                         $logType = 'move_redir';
3773                 } else {
3774                         $moveOverRedirect = false;
3775                         $logType = 'move';
3776                 }
3777
3778                 if ( $createRedirect ) {
3779                         $contentHandler = ContentHandler::getForTitle( $this );
3780                         $redirectContent = $contentHandler->makeRedirectContent( $nt );
3781
3782                         // NOTE: If this page's content model does not support redirects, $redirectContent will be null.
3783                 } else {
3784                         $redirectContent = null;
3785                 }
3786
3787                 $logEntry = new ManualLogEntry( 'move', $logType );
3788                 $logEntry->setPerformer( $wgUser );
3789                 $logEntry->setTarget( $this );
3790                 $logEntry->setComment( $reason );
3791                 $logEntry->setParameters( array(
3792                         '4::target' => $nt->getPrefixedText(),
3793                         '5::noredir' => $redirectContent ? '0': '1',
3794                 ) );
3795
3796                 $formatter = LogFormatter::newFromEntry( $logEntry );
3797                 $formatter->setContext( RequestContext::newExtraneousContext( $this ) );
3798                 $comment = $formatter->getPlainActionText();
3799                 if ( $reason ) {
3800                         $comment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
3801                 }
3802                 # Truncate for whole multibyte characters.
3803                 $comment = $wgContLang->truncate( $comment, 255 );
3804
3805                 $oldid = $this->getArticleID();
3806
3807                 $dbw = wfGetDB( DB_MASTER );
3808
3809                 $newpage = WikiPage::factory( $nt );
3810
3811                 if ( $moveOverRedirect ) {
3812                         $newid = $nt->getArticleID();
3813
3814                         # Delete the old redirect. We don't save it to history since
3815                         # by definition if we've got here it's rather uninteresting.
3816                         # We have to remove it so that the next step doesn't trigger
3817                         # a conflict on the unique namespace+title index...
3818                         $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
3819
3820                         $newpage->doDeleteUpdates( $newid );
3821                 }
3822
3823                 # Save a null revision in the page's history notifying of the move
3824                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3825                 if ( !is_object( $nullRevision ) ) {
3826                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3827                 }
3828
3829                 $nullRevision->insertOn( $dbw );
3830
3831                 # Change the name of the target page:
3832                 $dbw->update( 'page',
3833                         /* SET */ array(
3834                                 'page_namespace' => $nt->getNamespace(),
3835                                 'page_title'     => $nt->getDBkey(),
3836                         ),
3837                         /* WHERE */ array( 'page_id' => $oldid ),
3838                         __METHOD__
3839                 );
3840
3841                 $this->resetArticleID( 0 );
3842                 $nt->resetArticleID( $oldid );
3843
3844                 $newpage->updateRevisionOn( $dbw, $nullRevision );
3845
3846                 wfRunHooks( 'NewRevisionFromEditComplete',
3847                         array( $newpage, $nullRevision, $nullRevision->getParentId(), $wgUser ) );
3848
3849                 $newpage->doEditUpdates( $nullRevision, $wgUser, array( 'changed' => false ) );
3850
3851                 if ( !$moveOverRedirect ) {
3852                         WikiPage::onArticleCreate( $nt );
3853                 }
3854
3855                 # Recreate the redirect, this time in the other direction.
3856                 if ( !$redirectContent ) {
3857                         WikiPage::onArticleDelete( $this );
3858                 } else {
3859                         $redirectArticle = WikiPage::factory( $this );
3860                         $newid = $redirectArticle->insertOn( $dbw );
3861                         if ( $newid ) { // sanity
3862                                 $redirectRevision = new Revision( array(
3863                                         'title'   => $this, // for determining the default content model
3864                                         'page'    => $newid,
3865                                         'comment' => $comment,
3866                                         'content'    => $redirectContent ) );
3867                                 $redirectRevision->insertOn( $dbw );
3868                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3869
3870                                 wfRunHooks( 'NewRevisionFromEditComplete',
3871                                         array( $redirectArticle, $redirectRevision, false, $wgUser ) );
3872
3873                                 $redirectArticle->doEditUpdates( $redirectRevision, $wgUser, array( 'created' => true ) );
3874                         }
3875                 }
3876
3877                 # Log the move
3878                 $logid = $logEntry->insert();
3879                 $logEntry->publish( $logid );
3880         }
3881
3882         /**
3883          * Move this page's subpages to be subpages of $nt
3884          *
3885          * @param $nt Title Move target
3886          * @param $auth bool Whether $wgUser's permissions should be checked
3887          * @param $reason string The reason for the move
3888          * @param $createRedirect bool Whether to create redirects from the old subpages to
3889          *     the new ones Ignored if the user doesn't have the 'suppressredirect' right
3890          * @return mixed array with old page titles as keys, and strings (new page titles) or
3891          *     arrays (errors) as values, or an error array with numeric indices if no pages
3892          *     were moved
3893          */
3894         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3895                 global $wgMaximumMovedPages;
3896                 // Check permissions
3897                 if ( !$this->userCan( 'move-subpages' ) ) {
3898                         return array( 'cant-move-subpages' );
3899                 }
3900                 // Do the source and target namespaces support subpages?
3901                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
3902                         return array( 'namespace-nosubpages',
3903                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3904                 }
3905                 if ( !MWNamespace::hasSubpages( $nt->getNamespace() ) ) {
3906                         return array( 'namespace-nosubpages',
3907                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3908                 }
3909
3910                 $subpages = $this->getSubpages( $wgMaximumMovedPages + 1 );
3911                 $retval = array();
3912                 $count = 0;
3913                 foreach ( $subpages as $oldSubpage ) {
3914                         $count++;
3915                         if ( $count > $wgMaximumMovedPages ) {
3916                                 $retval[$oldSubpage->getPrefixedTitle()] =
3917                                                 array( 'movepage-max-pages',
3918                                                         $wgMaximumMovedPages );
3919                                 break;
3920                         }
3921
3922                         // We don't know whether this function was called before
3923                         // or after moving the root page, so check both
3924                         // $this and $nt
3925                         if ( $oldSubpage->getArticleID() == $this->getArticleID() ||
3926                                         $oldSubpage->getArticleID() == $nt->getArticleID() )
3927                         {
3928                                 // When moving a page to a subpage of itself,
3929                                 // don't move it twice
3930                                 continue;
3931                         }
3932                         $newPageName = preg_replace(
3933                                         '#^' . preg_quote( $this->getDBkey(), '#' ) . '#',
3934                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3935                                         $oldSubpage->getDBkey() );
3936                         if ( $oldSubpage->isTalkPage() ) {
3937                                 $newNs = $nt->getTalkPage()->getNamespace();
3938                         } else {
3939                                 $newNs = $nt->getSubjectPage()->getNamespace();
3940                         }
3941                         # Bug 14385: we need makeTitleSafe because the new page names may
3942                         # be longer than 255 characters.
3943                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3944
3945                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3946                         if ( $success === true ) {
3947                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3948                         } else {
3949                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3950                         }
3951                 }
3952                 return $retval;
3953         }
3954
3955         /**
3956          * Checks if this page is just a one-rev redirect.
3957          * Adds lock, so don't use just for light purposes.
3958          *
3959          * @return Bool
3960          */
3961         public function isSingleRevRedirect() {
3962                 global $wgContentHandlerUseDB;
3963
3964                 $dbw = wfGetDB( DB_MASTER );
3965
3966                 # Is it a redirect?
3967                 $fields = array( 'page_is_redirect', 'page_latest', 'page_id' );
3968                 if ( $wgContentHandlerUseDB ) $fields[] = 'page_content_model';
3969
3970                 $row = $dbw->selectRow( 'page',
3971                         $fields,
3972                         $this->pageCond(),
3973                         __METHOD__,
3974                         array( 'FOR UPDATE' )
3975                 );
3976                 # Cache some fields we may want
3977                 $this->mArticleID = $row ? intval( $row->page_id ) : 0;
3978                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3979                 $this->mLatestID = $row ? intval( $row->page_latest ) : false;
3980                 $this->mContentModel = $row && isset( $row->page_content_model ) ? strval( $row->page_content_model ) : false;
3981                 if ( !$this->mRedirect ) {
3982                         return false;
3983                 }
3984                 # Does the article have a history?
3985                 $row = $dbw->selectField( array( 'page', 'revision' ),
3986                         'rev_id',
3987                         array( 'page_namespace' => $this->getNamespace(),
3988                                 'page_title' => $this->getDBkey(),
3989                                 'page_id=rev_page',
3990                                 'page_latest != rev_id'
3991                         ),
3992                         __METHOD__,
3993                         array( 'FOR UPDATE' )
3994                 );
3995                 # Return true if there was no history
3996                 return ( $row === false );
3997         }
3998
3999         /**
4000          * Checks if $this can be moved to a given Title
4001          * - Selects for update, so don't call it unless you mean business
4002          *
4003          * @param $nt Title the new title to check
4004          * @return Bool
4005          */
4006         public function isValidMoveTarget( $nt ) {
4007                 # Is it an existing file?
4008                 if ( $nt->getNamespace() == NS_FILE ) {
4009                         $file = wfLocalFile( $nt );
4010                         if ( $file->exists() ) {
4011                                 wfDebug( __METHOD__ . ": file exists\n" );
4012                                 return false;
4013                         }
4014                 }
4015                 # Is it a redirect with no history?
4016                 if ( !$nt->isSingleRevRedirect() ) {
4017                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
4018                         return false;
4019                 }
4020                 # Get the article text
4021                 $rev = Revision::newFromTitle( $nt, false, Revision::READ_LATEST );
4022                 if( !is_object( $rev ) ) {
4023                         return false;
4024                 }
4025                 $content = $rev->getContent();
4026                 # Does the redirect point to the source?
4027                 # Or is it a broken self-redirect, usually caused by namespace collisions?
4028                 $redirTitle = $content ? $content->getRedirectTarget() : null;
4029
4030                 if ( $redirTitle ) {
4031                         if ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
4032                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) {
4033                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
4034                                 return false;
4035                         } else {
4036                                 return true;
4037                         }
4038                 } else {
4039                         # Fail safe (not a redirect after all. strange.)
4040                         wfDebug( __METHOD__ . ": failsafe: database sais " . $nt->getPrefixedDBkey() .
4041                                                 " is a redirect, but it doesn't contain a valid redirect.\n" );
4042                         return false;
4043                 }
4044         }
4045
4046         /**
4047          * Get categories to which this Title belongs and return an array of
4048          * categories' names.
4049          *
4050          * @return Array of parents in the form:
4051          *        $parent => $currentarticle
4052          */
4053         public function getParentCategories() {
4054                 global $wgContLang;
4055
4056                 $data = array();
4057
4058                 $titleKey = $this->getArticleID();
4059
4060                 if ( $titleKey === 0 ) {
4061                         return $data;
4062                 }
4063
4064                 $dbr = wfGetDB( DB_SLAVE );
4065
4066                 $res = $dbr->select(
4067                         'categorylinks',
4068                         'cl_to',
4069                         array( 'cl_from' => $titleKey ),
4070                         __METHOD__
4071                 );
4072
4073                 if ( $res->numRows() > 0 ) {
4074                         foreach ( $res as $row ) {
4075                                 // $data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
4076                                 $data[$wgContLang->getNSText( NS_CATEGORY ) . ':' . $row->cl_to] = $this->getFullText();
4077                         }
4078                 }
4079                 return $data;
4080         }
4081
4082         /**
4083          * Get a tree of parent categories
4084          *
4085          * @param $children Array with the children in the keys, to check for circular refs
4086          * @return Array Tree of parent categories
4087          */
4088         public function getParentCategoryTree( $children = array() ) {
4089                 $stack = array();
4090                 $parents = $this->getParentCategories();
4091
4092                 if ( $parents ) {
4093                         foreach ( $parents as $parent => $current ) {
4094                                 if ( array_key_exists( $parent, $children ) ) {
4095                                         # Circular reference
4096                                         $stack[$parent] = array();
4097                                 } else {
4098                                         $nt = Title::newFromText( $parent );
4099                                         if ( $nt ) {
4100                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array( $parent => 1 ) );
4101                                         }
4102                                 }
4103                         }
4104                 }
4105
4106                 return $stack;
4107         }
4108
4109         /**
4110          * Get an associative array for selecting this title from
4111          * the "page" table
4112          *
4113          * @return Array suitable for the $where parameter of DB::select()
4114          */
4115         public function pageCond() {
4116                 if ( $this->mArticleID > 0 ) {
4117                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
4118                         return array( 'page_id' => $this->mArticleID );
4119                 } else {
4120                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
4121                 }
4122         }
4123
4124         /**
4125          * Get the revision ID of the previous revision
4126          *
4127          * @param $revId Int Revision ID. Get the revision that was before this one.
4128          * @param $flags Int Title::GAID_FOR_UPDATE
4129          * @return Int|Bool Old revision ID, or FALSE if none exists
4130          */
4131         public function getPreviousRevisionID( $revId, $flags = 0 ) {
4132                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
4133                 $revId = $db->selectField( 'revision', 'rev_id',
4134                         array(
4135                                 'rev_page' => $this->getArticleID( $flags ),
4136                                 'rev_id < ' . intval( $revId )
4137                         ),
4138                         __METHOD__,
4139                         array( 'ORDER BY' => 'rev_id DESC' )
4140                 );
4141
4142                 if ( $revId === false ) {
4143                         return false;
4144                 } else {
4145                         return intval( $revId );
4146                 }
4147         }
4148
4149         /**
4150          * Get the revision ID of the next revision
4151          *
4152          * @param $revId Int Revision ID. Get the revision that was after this one.
4153          * @param $flags Int Title::GAID_FOR_UPDATE
4154          * @return Int|Bool Next revision ID, or FALSE if none exists
4155          */
4156         public function getNextRevisionID( $revId, $flags = 0 ) {
4157                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
4158                 $revId = $db->selectField( 'revision', 'rev_id',
4159                         array(
4160                                 'rev_page' => $this->getArticleID( $flags ),
4161                                 'rev_id > ' . intval( $revId )
4162                         ),
4163                         __METHOD__,
4164                         array( 'ORDER BY' => 'rev_id' )
4165                 );
4166
4167                 if ( $revId === false ) {
4168                         return false;
4169                 } else {
4170                         return intval( $revId );
4171                 }
4172         }
4173
4174         /**
4175          * Get the first revision of the page
4176          *
4177          * @param $flags Int Title::GAID_FOR_UPDATE
4178          * @return Revision|Null if page doesn't exist
4179          */
4180         public function getFirstRevision( $flags = 0 ) {
4181                 $pageId = $this->getArticleID( $flags );
4182                 if ( $pageId ) {
4183                         $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
4184                         $row = $db->selectRow( 'revision', Revision::selectFields(),
4185                                 array( 'rev_page' => $pageId ),
4186                                 __METHOD__,
4187                                 array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
4188                         );
4189                         if ( $row ) {
4190                                 return new Revision( $row );
4191                         }
4192                 }
4193                 return null;
4194         }
4195
4196         /**
4197          * Get the oldest revision timestamp of this page
4198          *
4199          * @param $flags Int Title::GAID_FOR_UPDATE
4200          * @return String: MW timestamp
4201          */
4202         public function getEarliestRevTime( $flags = 0 ) {
4203                 $rev = $this->getFirstRevision( $flags );
4204                 return $rev ? $rev->getTimestamp() : null;
4205         }
4206
4207         /**
4208          * Check if this is a new page
4209          *
4210          * @return bool
4211          */
4212         public function isNewPage() {
4213                 $dbr = wfGetDB( DB_SLAVE );
4214                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
4215         }
4216
4217         /**
4218          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
4219          *
4220          * @return bool
4221          */
4222         public function isBigDeletion() {
4223                 global $wgDeleteRevisionsLimit;
4224
4225                 if ( !$wgDeleteRevisionsLimit ) {
4226                         return false;
4227                 }
4228
4229                 $revCount = $this->estimateRevisionCount();
4230                 return $revCount > $wgDeleteRevisionsLimit;
4231         }
4232
4233         /**
4234          * Get the  approximate revision count of this page.
4235          *
4236          * @return int
4237          */
4238         public function estimateRevisionCount() {
4239                 if ( !$this->exists() ) {
4240                         return 0;
4241                 }
4242
4243                 if ( $this->mEstimateRevisions === null ) {
4244                         $dbr = wfGetDB( DB_SLAVE );
4245                         $this->mEstimateRevisions = $dbr->estimateRowCount( 'revision', '*',
4246                                 array( 'rev_page' => $this->getArticleID() ), __METHOD__ );
4247                 }
4248
4249                 return $this->mEstimateRevisions;
4250         }
4251
4252         /**
4253          * Get the number of revisions between the given revision.
4254          * Used for diffs and other things that really need it.
4255          *
4256          * @param $old int|Revision Old revision or rev ID (first before range)
4257          * @param $new int|Revision New revision or rev ID (first after range)
4258          * @return Int Number of revisions between these revisions.
4259          */
4260         public function countRevisionsBetween( $old, $new ) {
4261                 if ( !( $old instanceof Revision ) ) {
4262                         $old = Revision::newFromTitle( $this, (int)$old );
4263                 }
4264                 if ( !( $new instanceof Revision ) ) {
4265                         $new = Revision::newFromTitle( $this, (int)$new );
4266                 }
4267                 if ( !$old || !$new ) {
4268                         return 0; // nothing to compare
4269                 }
4270                 $dbr = wfGetDB( DB_SLAVE );
4271                 return (int)$dbr->selectField( 'revision', 'count(*)',
4272                         array(
4273                                 'rev_page' => $this->getArticleID(),
4274                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4275                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4276                         ),
4277                         __METHOD__
4278                 );
4279         }
4280
4281         /**
4282          * Get the number of authors between the given revisions or revision IDs.
4283          * Used for diffs and other things that really need it.
4284          *
4285          * @param $old int|Revision Old revision or rev ID (first before range by default)
4286          * @param $new int|Revision New revision or rev ID (first after range by default)
4287          * @param $limit int Maximum number of authors
4288          * @param $options string|array (Optional): Single option, or an array of options:
4289          *     'include_old' Include $old in the range; $new is excluded.
4290          *     'include_new' Include $new in the range; $old is excluded.
4291          *     'include_both' Include both $old and $new in the range.
4292          *     Unknown option values are ignored.
4293          * @return int Number of revision authors in the range; zero if not both revisions exist
4294          */
4295         public function countAuthorsBetween( $old, $new, $limit, $options = array() ) {
4296                 if ( !( $old instanceof Revision ) ) {
4297                         $old = Revision::newFromTitle( $this, (int)$old );
4298                 }
4299                 if ( !( $new instanceof Revision ) ) {
4300                         $new = Revision::newFromTitle( $this, (int)$new );
4301                 }
4302                 // XXX: what if Revision objects are passed in, but they don't refer to this title?
4303                 // Add $old->getPage() != $new->getPage() || $old->getPage() != $this->getArticleID()
4304                 // in the sanity check below?
4305                 if ( !$old || !$new ) {
4306                         return 0; // nothing to compare
4307                 }
4308                 $old_cmp = '>';
4309                 $new_cmp = '<';
4310                 $options = (array)$options;
4311                 if ( in_array( 'include_old', $options ) ) {
4312                         $old_cmp = '>=';
4313                 }
4314                 if ( in_array( 'include_new', $options ) ) {
4315                         $new_cmp = '<=';
4316                 }
4317                 if ( in_array( 'include_both', $options ) ) {
4318                         $old_cmp = '>=';
4319                         $new_cmp = '<=';
4320                 }
4321                 // No DB query needed if $old and $new are the same or successive revisions:
4322                 if ( $old->getId() === $new->getId() ) {
4323                         return ( $old_cmp === '>' && $new_cmp === '<' ) ? 0 : 1;
4324                 } else if ( $old->getId() === $new->getParentId() ) {
4325                         if ( $old_cmp === '>' || $new_cmp === '<' ) {
4326                                 return ( $old_cmp === '>' && $new_cmp === '<' ) ? 0 : 1;
4327                         }
4328                         return ( $old->getRawUserText() === $new->getRawUserText() ) ? 1 : 2;
4329                 }
4330                 $dbr = wfGetDB( DB_SLAVE );
4331                 $res = $dbr->select( 'revision', 'DISTINCT rev_user_text',
4332                         array(
4333                                 'rev_page' => $this->getArticleID(),
4334                                 "rev_timestamp $old_cmp " . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4335                                 "rev_timestamp $new_cmp " . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4336                         ), __METHOD__,
4337                         array( 'LIMIT' => $limit + 1 ) // add one so caller knows it was truncated
4338                 );
4339                 return (int)$dbr->numRows( $res );
4340         }
4341
4342         /**
4343          * Compare with another title.
4344          *
4345          * @param $title Title
4346          * @return Bool
4347          */
4348         public function equals( Title $title ) {
4349                 // Note: === is necessary for proper matching of number-like titles.
4350                 return $this->getInterwiki() === $title->getInterwiki()
4351                         && $this->getNamespace() == $title->getNamespace()
4352                         && $this->getDBkey() === $title->getDBkey();
4353         }
4354
4355         /**
4356          * Check if this title is a subpage of another title
4357          *
4358          * @param $title Title
4359          * @return Bool
4360          */
4361         public function isSubpageOf( Title $title ) {
4362                 return $this->getInterwiki() === $title->getInterwiki()
4363                         && $this->getNamespace() == $title->getNamespace()
4364                         && strpos( $this->getDBkey(), $title->getDBkey() . '/' ) === 0;
4365         }
4366
4367         /**
4368          * Check if page exists.  For historical reasons, this function simply
4369          * checks for the existence of the title in the page table, and will
4370          * thus return false for interwiki links, special pages and the like.
4371          * If you want to know if a title can be meaningfully viewed, you should
4372          * probably call the isKnown() method instead.
4373          *
4374          * @return Bool
4375          */
4376         public function exists() {
4377                 return $this->getArticleID() != 0;
4378         }
4379
4380         /**
4381          * Should links to this title be shown as potentially viewable (i.e. as
4382          * "bluelinks"), even if there's no record by this title in the page
4383          * table?
4384          *
4385          * This function is semi-deprecated for public use, as well as somewhat
4386          * misleadingly named.  You probably just want to call isKnown(), which
4387          * calls this function internally.
4388          *
4389          * (ISSUE: Most of these checks are cheap, but the file existence check
4390          * can potentially be quite expensive.  Including it here fixes a lot of
4391          * existing code, but we might want to add an optional parameter to skip
4392          * it and any other expensive checks.)
4393          *
4394          * @return Bool
4395          */
4396         public function isAlwaysKnown() {
4397                 $isKnown = null;
4398
4399                 /**
4400                  * Allows overriding default behaviour for determining if a page exists.
4401                  * If $isKnown is kept as null, regular checks happen. If it's
4402                  * a boolean, this value is returned by the isKnown method.
4403                  *
4404                  * @since 1.20
4405                  *
4406                  * @param Title $title
4407                  * @param boolean|null $isKnown
4408                  */
4409                 wfRunHooks( 'TitleIsAlwaysKnown', array( $this, &$isKnown ) );
4410
4411                 if ( !is_null( $isKnown ) ) {
4412                         return $isKnown;
4413                 }
4414
4415                 if ( $this->mInterwiki != '' ) {
4416                         return true;  // any interwiki link might be viewable, for all we know
4417                 }
4418
4419                 switch( $this->mNamespace ) {
4420                         case NS_MEDIA:
4421                         case NS_FILE:
4422                                 // file exists, possibly in a foreign repo
4423                                 return (bool)wfFindFile( $this );
4424                         case NS_SPECIAL:
4425                                 // valid special page
4426                                 return SpecialPageFactory::exists( $this->getDBkey() );
4427                         case NS_MAIN:
4428                                 // selflink, possibly with fragment
4429                                 return $this->mDbkeyform == '';
4430                         case NS_MEDIAWIKI:
4431                                 // known system message
4432                                 return $this->hasSourceText() !== false;
4433                         default:
4434                                 return false;
4435                 }
4436         }
4437
4438         /**
4439          * Does this title refer to a page that can (or might) be meaningfully
4440          * viewed?  In particular, this function may be used to determine if
4441          * links to the title should be rendered as "bluelinks" (as opposed to
4442          * "redlinks" to non-existent pages).
4443          * Adding something else to this function will cause inconsistency
4444          * since LinkHolderArray calls isAlwaysKnown() and does its own
4445          * page existence check.
4446          *
4447          * @return Bool
4448          */
4449         public function isKnown() {
4450                 return $this->isAlwaysKnown() || $this->exists();
4451         }
4452
4453         /**
4454          * Does this page have source text?
4455          *
4456          * @return Boolean
4457          */
4458         public function hasSourceText() {
4459                 if ( $this->exists() ) {
4460                         return true;
4461                 }
4462
4463                 if ( $this->mNamespace == NS_MEDIAWIKI ) {
4464                         // If the page doesn't exist but is a known system message, default
4465                         // message content will be displayed, same for language subpages-
4466                         // Use always content language to avoid loading hundreds of languages
4467                         // to get the link color.
4468                         global $wgContLang;
4469                         list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4470                         $message = wfMessage( $name )->inLanguage( $wgContLang )->useDatabase( false );
4471                         return $message->exists();
4472                 }
4473
4474                 return false;
4475         }
4476
4477         /**
4478          * Get the default message text or false if the message doesn't exist
4479          *
4480          * @return String or false
4481          */
4482         public function getDefaultMessageText() {
4483                 global $wgContLang;
4484
4485                 if ( $this->getNamespace() != NS_MEDIAWIKI ) { // Just in case
4486                         return false;
4487                 }
4488
4489                 list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4490                 $message = wfMessage( $name )->inLanguage( $lang )->useDatabase( false );
4491
4492                 if ( $message->exists() ) {
4493                         return $message->plain();
4494                 } else {
4495                         return false;
4496                 }
4497         }
4498
4499         /**
4500          * Updates page_touched for this page; called from LinksUpdate.php
4501          *
4502          * @return Bool true if the update succeded
4503          */
4504         public function invalidateCache() {
4505                 global $wgMemc;
4506                 if ( wfReadOnly() ) {
4507                         return false;
4508                 }
4509                 $dbw = wfGetDB( DB_MASTER );
4510                 $success = $dbw->update(
4511                         'page',
4512                         array( 'page_touched' => $dbw->timestamp() ),
4513                         $this->pageCond(),
4514                         __METHOD__
4515                 );
4516                 HTMLFileCache::clearFileCache( $this );
4517
4518                 // Clear page info.
4519                 $revision = WikiPage::factory( $this )->getRevision();
4520                 if( $revision !== null ) {
4521                         $memcKey = wfMemcKey( 'infoaction', $this->getPrefixedText(), $revision->getId() );
4522                         $success = $success && $wgMemc->delete( $memcKey );
4523                 }
4524
4525                 return $success;
4526         }
4527
4528         /**
4529          * Update page_touched timestamps and send squid purge messages for
4530          * pages linking to this title. May be sent to the job queue depending
4531          * on the number of links. Typically called on create and delete.
4532          */
4533         public function touchLinks() {
4534                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
4535                 $u->doUpdate();
4536
4537                 if ( $this->getNamespace() == NS_CATEGORY ) {
4538                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
4539                         $u->doUpdate();
4540                 }
4541         }
4542
4543         /**
4544          * Get the last touched timestamp
4545          *
4546          * @param $db DatabaseBase: optional db
4547          * @return String last-touched timestamp
4548          */
4549         public function getTouched( $db = null ) {
4550                 $db = isset( $db ) ? $db : wfGetDB( DB_SLAVE );
4551                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
4552                 return $touched;
4553         }
4554
4555         /**
4556          * Get the timestamp when this page was updated since the user last saw it.
4557          *
4558          * @param $user User
4559          * @return String|Null
4560          */
4561         public function getNotificationTimestamp( $user = null ) {
4562                 global $wgUser, $wgShowUpdatedMarker;
4563                 // Assume current user if none given
4564                 if ( !$user ) {
4565                         $user = $wgUser;
4566                 }
4567                 // Check cache first
4568                 $uid = $user->getId();
4569                 // avoid isset here, as it'll return false for null entries
4570                 if ( array_key_exists( $uid, $this->mNotificationTimestamp ) ) {
4571                         return $this->mNotificationTimestamp[$uid];
4572                 }
4573                 if ( !$uid || !$wgShowUpdatedMarker ) {
4574                         return $this->mNotificationTimestamp[$uid] = false;
4575                 }
4576                 // Don't cache too much!
4577                 if ( count( $this->mNotificationTimestamp ) >= self::CACHE_MAX ) {
4578                         $this->mNotificationTimestamp = array();
4579                 }
4580                 $dbr = wfGetDB( DB_SLAVE );
4581                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
4582                         'wl_notificationtimestamp',
4583                         array(
4584                                 'wl_user' => $user->getId(),
4585                                 'wl_namespace' => $this->getNamespace(),
4586                                 'wl_title' => $this->getDBkey(),
4587                         ),
4588                         __METHOD__
4589                 );
4590                 return $this->mNotificationTimestamp[$uid];
4591         }
4592
4593         /**
4594          * Generate strings used for xml 'id' names in monobook tabs
4595          *
4596          * @param $prepend string defaults to 'nstab-'
4597          * @return String XML 'id' name
4598          */
4599         public function getNamespaceKey( $prepend = 'nstab-' ) {
4600                 global $wgContLang;
4601                 // Gets the subject namespace if this title
4602                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4603                 // Checks if cononical namespace name exists for namespace
4604                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4605                         // Uses canonical namespace name
4606                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4607                 } else {
4608                         // Uses text of namespace
4609                         $namespaceKey = $this->getSubjectNsText();
4610                 }
4611                 // Makes namespace key lowercase
4612                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4613                 // Uses main
4614                 if ( $namespaceKey == '' ) {
4615                         $namespaceKey = 'main';
4616                 }
4617                 // Changes file to image for backwards compatibility
4618                 if ( $namespaceKey == 'file' ) {
4619                         $namespaceKey = 'image';
4620                 }
4621                 return $prepend . $namespaceKey;
4622         }
4623
4624         /**
4625          * Get all extant redirects to this Title
4626          *
4627          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4628          * @return Array of Title redirects to this title
4629          */
4630         public function getRedirectsHere( $ns = null ) {
4631                 $redirs = array();
4632
4633                 $dbr = wfGetDB( DB_SLAVE );
4634                 $where = array(
4635                         'rd_namespace' => $this->getNamespace(),
4636                         'rd_title' => $this->getDBkey(),
4637                         'rd_from = page_id'
4638                 );
4639                 if ( $this->isExternal() ) {
4640                         $where['rd_interwiki'] = $this->getInterwiki();
4641                 } else {
4642                         $where[] = 'rd_interwiki = ' . $dbr->addQuotes( '' ) . ' OR rd_interwiki IS NULL';
4643                 }
4644                 if ( !is_null( $ns ) ) {
4645                         $where['page_namespace'] = $ns;
4646                 }
4647
4648                 $res = $dbr->select(
4649                         array( 'redirect', 'page' ),
4650                         array( 'page_namespace', 'page_title' ),
4651                         $where,
4652                         __METHOD__
4653                 );
4654
4655                 foreach ( $res as $row ) {
4656                         $redirs[] = self::newFromRow( $row );
4657                 }
4658                 return $redirs;
4659         }
4660
4661         /**
4662          * Check if this Title is a valid redirect target
4663          *
4664          * @return Bool
4665          */
4666         public function isValidRedirectTarget() {
4667                 global $wgInvalidRedirectTargets;
4668
4669                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4670                 if ( $this->isSpecial( 'Userlogout' ) ) {
4671                         return false;
4672                 }
4673
4674                 foreach ( $wgInvalidRedirectTargets as $target ) {
4675                         if ( $this->isSpecial( $target ) ) {
4676                                 return false;
4677                         }
4678                 }
4679
4680                 return true;
4681         }
4682
4683         /**
4684          * Get a backlink cache object
4685          *
4686          * @return BacklinkCache
4687          */
4688         public function getBacklinkCache() {
4689                 return BacklinkCache::get( $this );
4690         }
4691
4692         /**
4693          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4694          *
4695          * @return Boolean
4696          */
4697         public function canUseNoindex() {
4698                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4699
4700                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4701                         ? $wgContentNamespaces
4702                         : $wgExemptFromUserRobotsControl;
4703
4704                 return !in_array( $this->mNamespace, $bannedNamespaces );
4705
4706         }
4707
4708         /**
4709          * Returns the raw sort key to be used for categories, with the specified
4710          * prefix.  This will be fed to Collation::getSortKey() to get a
4711          * binary sortkey that can be used for actual sorting.
4712          *
4713          * @param $prefix string The prefix to be used, specified using
4714          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4715          *   prefix.
4716          * @return string
4717          */
4718         public function getCategorySortkey( $prefix = '' ) {
4719                 $unprefixed = $this->getText();
4720
4721                 // Anything that uses this hook should only depend
4722                 // on the Title object passed in, and should probably
4723                 // tell the users to run updateCollations.php --force
4724                 // in order to re-sort existing category relations.
4725                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4726                 if ( $prefix !== '' ) {
4727                         # Separate with a line feed, so the unprefixed part is only used as
4728                         # a tiebreaker when two pages have the exact same prefix.
4729                         # In UCA, tab is the only character that can sort above LF
4730                         # so we strip both of them from the original prefix.
4731                         $prefix = strtr( $prefix, "\n\t", '  ' );
4732                         return "$prefix\n$unprefixed";
4733                 }
4734                 return $unprefixed;
4735         }
4736
4737         /**
4738          * Get the language in which the content of this page is written in
4739          * wikitext. Defaults to $wgContLang, but in certain cases it can be
4740          * e.g. $wgLang (such as special pages, which are in the user language).
4741          *
4742          * @since 1.18
4743          * @return Language
4744          */
4745         public function getPageLanguage() {
4746                 global $wgLang;
4747                 if ( $this->isSpecialPage() ) {
4748                         // special pages are in the user language
4749                         return $wgLang;
4750                 }
4751
4752                 //TODO: use the LinkCache to cache this! Note that this may depend on user settings, so the cache should be only per-request.
4753                 //NOTE: ContentHandler::getPageLanguage() may need to load the content to determine the page language!
4754                 $contentHandler = ContentHandler::getForTitle( $this );
4755                 $pageLang = $contentHandler->getPageLanguage( $this );
4756
4757                 return wfGetLangObj( $pageLang );
4758         }
4759
4760         /**
4761          * Get the language in which the content of this page is written when
4762          * viewed by user. Defaults to $wgContLang, but in certain cases it can be
4763          * e.g. $wgLang (such as special pages, which are in the user language).
4764          *
4765          * @since 1.20
4766          * @return Language
4767          */
4768         public function getPageViewLanguage() {
4769                 global $wgLang;
4770
4771                 if ( $this->isSpecialPage() ) {
4772                         // If the user chooses a variant, the content is actually
4773                         // in a language whose code is the variant code.
4774                         $variant = $wgLang->getPreferredVariant();
4775                         if ( $wgLang->getCode() !== $variant ) {
4776                                 return Language::factory( $variant );
4777                         }
4778
4779                         return $wgLang;
4780                 }
4781
4782                 //NOTE: can't be cached persistently, depends on user settings
4783                 //NOTE: ContentHandler::getPageViewLanguage() may need to load the content to determine the page language!
4784                 $contentHandler = ContentHandler::getForTitle( $this );
4785                 $pageLang = $contentHandler->getPageViewLanguage( $this );
4786                 return $pageLang;
4787         }
4788
4789         /**
4790          * Get a list of rendered edit notices for this page.
4791          *
4792          * Array is keyed by the original message key, and values are rendered using parseAsBlock, so
4793          * they will already be wrapped in paragraphs.
4794          *
4795          * @since 1.21
4796          * @return Array
4797          */
4798         public function getEditNotices() {
4799                 $notices = array();
4800
4801                 # Optional notices on a per-namespace and per-page basis
4802                 $editnotice_ns = 'editnotice-' . $this->getNamespace();
4803                 $editnotice_ns_message = wfMessage( $editnotice_ns );
4804                 if ( $editnotice_ns_message->exists() ) {
4805                         $notices[$editnotice_ns] = $editnotice_ns_message->parseAsBlock();
4806                 }
4807                 if ( MWNamespace::hasSubpages( $this->getNamespace() ) ) {
4808                         $parts = explode( '/', $this->getDBkey() );
4809                         $editnotice_base = $editnotice_ns;
4810                         while ( count( $parts ) > 0 ) {
4811                                 $editnotice_base .= '-' . array_shift( $parts );
4812                                 $editnotice_base_msg = wfMessage( $editnotice_base );
4813                                 if ( $editnotice_base_msg->exists() ) {
4814                                         $notices[$editnotice_base] = $editnotice_base_msg->parseAsBlock();
4815                                 }
4816                         }
4817                 } else {
4818                         # Even if there are no subpages in namespace, we still don't want / in MW ns.
4819                         $editnoticeText = $editnotice_ns . '-' . str_replace( '/', '-', $this->getDBkey() );
4820                         $editnoticeMsg = wfMessage( $editnoticeText );
4821                         if ( $editnoticeMsg->exists() ) {
4822                                 $notices[$editnoticeText] = $editnoticeMsg->parseAsBlock();
4823                         }
4824                 }
4825                 return $notices;
4826         }
4827 }