includes/WikiPage.php

   1 <?php
   2 /**
   3  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
   4  */
   5 abstract class Page {}
   6
   7 /**
   8  * Class representing a MediaWiki article and history.
   9  *
  10  * Some fields are public only for backwards-compatibility. Use accessors.
  11  * In the past, this class was part of Article.php and everything was public.
  12  *
  13  * @internal documentation reviewed 15 Mar 2010
  14  */
  15 class WikiPage extends Page {
  16         /**@{{
  17          * @protected
  18          * Fields are public for backwards-compatibility. Use accessors.
  19          * In the past, this class was part of Article.php and everything was public.
  20          */
  21         public $mTitle = null;               // !< Title object
  22         public $mCounter = -1;               // !< Not loaded
  23         public $mDataLoaded = false;         // !<
  24         public $mIsRedirect = false;         // !<
  25         public $mLatest = false;             // !<
  26         public $mPreparedEdit = false;           // !<
  27         public $mRedirectTarget = null;          // !< Title object
  28         public $mLastRevision = null;            // !< Revision object
  29         public $mTimestamp = '';             // !<
  30         public $mTouched = '19700101000000'; // !<
  31         /**@}}*/
  32
  33         /**
  34          * @protected
  35          * @var ParserOptions: ParserOptions object for $wgUser articles
  36          */
  37         public $mParserOptions;
  38
  39         /**
  40          * Constructor and clear the article
  41          * @param $title Title Reference to a Title object.
  42          */
  43         public function __construct( Title $title ) {
  44                 $this->mTitle = $title;
  45         }
  46
  47         /**
  48          * Constructor from a page id
  49          *
  50          * Always override this for all subclasses (until we use PHP with LSB)
  51          *
  52          * @param $id Int article ID to load
  53          */
  54         public static function newFromID( $id ) {
  55                 $t = Title::newFromID( $id );
  56                 # @todo FIXME: Doesn't inherit right
  57                 return $t == null ? null : new self( $t );
  58                 # return $t == null ? null : new static( $t ); // PHP 5.3
  59         }
  60
  61         /**
  62          * If this page is a redirect, get its target
  63          *
  64          * The target will be fetched from the redirect table if possible.
  65          * If this page doesn't have an entry there, call insertRedirect()
  66          * @return Title|mixed object, or null if this page is not a redirect
  67          */
  68         public function getRedirectTarget() {
  69                 if ( !$this->mTitle->isRedirect() ) {
  70                         return null;
  71                 }
  72
  73                 if ( $this->mRedirectTarget !== null ) {
  74                         return $this->mRedirectTarget;
  75                 }
  76
  77                 # Query the redirect table
  78                 $dbr = wfGetDB( DB_SLAVE );
  79                 $row = $dbr->selectRow( 'redirect',
  80                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
  81                         array( 'rd_from' => $this->getID() ),
  82                         __METHOD__
  83                 );
  84
  85                 // rd_fragment and rd_interwiki were added later, populate them if empty
  86                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
  87                         return $this->mRedirectTarget = Title::makeTitle(
  88                                 $row->rd_namespace, $row->rd_title,
  89                                 $row->rd_fragment, $row->rd_interwiki );
  90                 }
  91
  92                 # This page doesn't have an entry in the redirect table
  93                 return $this->mRedirectTarget = $this->insertRedirect();
  94         }
  95
  96         /**
  97          * Insert an entry for this page into the redirect table.
  98          *
  99          * Don't call this function directly unless you know what you're doing.
 100          * @return Title object or null if not a redirect
 101          */
 102         public function insertRedirect() {
 103                 // recurse through to only get the final target
 104                 $retval = Title::newFromRedirectRecurse( $this->getRawText() );
 105                 if ( !$retval ) {
 106                         return null;
 107                 }
 108                 $this->insertRedirectEntry( $retval );
 109                 return $retval;
 110         }
 111
 112         /**
 113          * Insert or update the redirect table entry for this page to indicate
 114          * it redirects to $rt .
 115          * @param $rt Title redirect target
 116          */
 117         public function insertRedirectEntry( $rt ) {
 118                 $dbw = wfGetDB( DB_MASTER );
 119                 $dbw->replace( 'redirect', array( 'rd_from' ),
 120                         array(
 121                                 'rd_from'               => $this->getID(),
 122                                 'rd_namespace'  => $rt->getNamespace(),
 123                                 'rd_title'              => $rt->getDBkey(),
 124                                 'rd_fragment'   => $rt->getFragment(),
 125                                 'rd_interwiki'  => $rt->getInterwiki(),
 126                         ),
 127                         __METHOD__
 128                 );
 129         }
 130
 131         /**
 132          * Get the Title object or URL this page redirects to
 133          *
 134          * @return mixed false, Title of in-wiki target, or string with URL
 135          */
 136         public function followRedirect() {
 137                 return $this->getRedirectURL( $this->getRedirectTarget() );
 138         }
 139
 140         /**
 141          * Get the Title object or URL to use for a redirect. We use Title
 142          * objects for same-wiki, non-special redirects and URLs for everything
 143          * else.
 144          * @param $rt Title Redirect target
 145          * @return mixed false, Title object of local target, or string with URL
 146          */
 147         public function getRedirectURL( $rt ) {
 148                 if ( $rt ) {
 149                         if ( $rt->getInterwiki() != '' ) {
 150                                 if ( $rt->isLocal() ) {
 151                                         // Offsite wikis need an HTTP redirect.
 152                                         //
 153                                         // This can be hard to reverse and may produce loops,
 154                                         // so they may be disabled in the site configuration.
 155                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
 156                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 157                                 }
 158                         } else {
 159                                 if ( $rt->getNamespace() == NS_SPECIAL ) {
 160                                         // Gotta handle redirects to special pages differently:
 161                                         // Fill the HTTP response "Location" header and ignore
 162                                         // the rest of the page we're on.
 163                                         //
 164                                         // This can be hard to reverse, so they may be disabled.
 165                                         if ( $rt->isSpecial( 'Userlogout' ) ) {
 166                                                 // rolleyes
 167                                         } else {
 168                                                 return $rt->getFullURL();
 169                                         }
 170                                 }
 171
 172                                 return $rt;
 173                         }
 174                 }
 175
 176                 // No or invalid redirect
 177                 return false;
 178         }
 179
 180         /**
 181          * Get the title object of the article
 182          * @return Title object of this page
 183          */
 184         public function getTitle() {
 185                 return $this->mTitle;
 186         }
 187
 188         /**
 189          * Clear the object
 190          */
 191         public function clear() {
 192                 $this->mDataLoaded = false;
 193
 194                 $this->mCounter = -1; # Not loaded
 195                 $this->mRedirectTarget = null; # Title object if set
 196                 $this->mLastRevision = null; # Latest revision
 197                 $this->mTimestamp = '';
 198                 $this->mTouched = '19700101000000';
 199                 $this->mIsRedirect = false;
 200                 $this->mLatest = false;
 201                 $this->mPreparedEdit = false;
 202         }
 203
 204         /**
 205          * Get the text that needs to be saved in order to undo all revisions
 206          * between $undo and $undoafter. Revisions must belong to the same page,
 207          * must exist and must not be deleted
 208          * @param $undo Revision
 209          * @param $undoafter Revision Must be an earlier revision than $undo
 210          * @return mixed string on success, false on failure
 211          */
 212         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
 213                 $cur_text = $this->getRawText();
 214                 if ( $cur_text === false ) {
 215                         return false; // no page
 216                 }
 217                 $undo_text = $undo->getText();
 218                 $undoafter_text = $undoafter->getText();
 219
 220                 if ( $cur_text == $undo_text ) {
 221                         # No use doing a merge if it's just a straight revert.
 222                         return $undoafter_text;
 223                 }
 224
 225                 $undone_text = '';
 226
 227                 if ( !wfMerge( $undo_text, $undoafter_text, $cur_text, $undone_text ) ) {
 228                         return false;
 229                 }
 230
 231                 return $undone_text;
 232         }
 233
 234         /**
 235          * Return the list of revision fields that should be selected to create
 236          * a new page.
 237          */
 238         public static function selectFields() {
 239                 return array(
 240                         'page_id',
 241                         'page_namespace',
 242                         'page_title',
 243                         'page_restrictions',
 244                         'page_counter',
 245                         'page_is_redirect',
 246                         'page_is_new',
 247                         'page_random',
 248                         'page_touched',
 249                         'page_latest',
 250                         'page_len',
 251                 );
 252         }
 253
 254         /**
 255          * Fetch a page record with the given conditions
 256          * @param $dbr DatabaseBase object
 257          * @param $conditions Array
 258          * @return mixed Database result resource, or false on failure
 259          */
 260         protected function pageData( $dbr, $conditions ) {
 261                 $fields = self::selectFields();
 262
 263                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 264
 265                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__ );
 266
 267                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 268
 269                 return $row;
 270         }
 271
 272         /**
 273          * Fetch a page record matching the Title object's namespace and title
 274          * using a sanitized title string
 275          *
 276          * @param $dbr DatabaseBase object
 277          * @param $title Title object
 278          * @return mixed Database result resource, or false on failure
 279          */
 280         protected function pageDataFromTitle( $dbr, $title ) {
 281                 return $this->pageData( $dbr, array(
 282                         'page_namespace' => $title->getNamespace(),
 283                         'page_title'     => $title->getDBkey() ) );
 284         }
 285
 286         /**
 287          * Fetch a page record matching the requested ID
 288          *
 289          * @param $dbr DatabaseBase
 290          * @param $id Integer
 291          * @return mixed Database result resource, or false on failure
 292          */
 293         protected function pageDataFromId( $dbr, $id ) {
 294                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 295         }
 296
 297         /**
 298          * Set the general counter, title etc data loaded from
 299          * some source.
 300          *
 301          * @param $data Object|String $res->fetchObject() object or the string "fromdb" to reload
 302          */
 303         public function loadPageData( $data = 'fromdb' ) {
 304                 if ( $data === 'fromdb' ) {
 305                         $dbr = wfGetDB( DB_SLAVE );
 306                         $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 307                 }
 308
 309                 $lc = LinkCache::singleton();
 310
 311                 if ( $data ) {
 312                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle, $data->page_len, $data->page_is_redirect, $data->page_latest );
 313
 314                         $this->mTitle->mArticleID = intval( $data->page_id );
 315
 316                         # Old-fashioned restrictions
 317                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 318
 319                         $this->mCounter     = intval( $data->page_counter );
 320                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 321                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 322                         $this->mLatest      = intval( $data->page_latest );
 323                 } else {
 324                         $lc->addBadLinkObj( $this->mTitle );
 325                         $this->mTitle->mArticleID = 0;
 326                 }
 327
 328                 $this->mDataLoaded = true;
 329         }
 330
 331         /**
 332          * @return int Page ID
 333          */
 334         public function getID() {
 335                 return $this->mTitle->getArticleID();
 336         }
 337
 338         /**
 339          * @return bool Whether or not the page exists in the database
 340          */
 341         public function exists() {
 342                 return $this->getId() > 0;
 343         }
 344
 345         /**
 346          * Check if this page is something we're going to be showing
 347          * some sort of sensible content for. If we return false, page
 348          * views (plain action=view) will return an HTTP 404 response,
 349          * so spiders and robots can know they're following a bad link.
 350          *
 351          * @return bool
 352          */
 353         public function hasViewableContent() {
 354                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 355         }
 356
 357         /**
 358          * @return int The view count for the page
 359          */
 360         public function getCount() {
 361                 if ( -1 == $this->mCounter ) {
 362                         $id = $this->getID();
 363
 364                         if ( $id == 0 ) {
 365                                 $this->mCounter = 0;
 366                         } else {
 367                                 $dbr = wfGetDB( DB_SLAVE );
 368                                 $this->mCounter = $dbr->selectField( 'page',
 369                                         'page_counter',
 370                                         array( 'page_id' => $id ),
 371                                         __METHOD__
 372                                 );
 373                         }
 374                 }
 375
 376                 return $this->mCounter;
 377         }
 378
 379         /**
 380          * Determine whether a page would be suitable for being counted as an
 381          * article in the site_stats table based on the title & its content
 382          *
 383          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 384          *        if false, the current database state will be used
 385          * @return Boolean
 386          */
 387         public function isCountable( $editInfo = false ) {
 388                 global $wgArticleCountMethod;
 389
 390                 if ( !$this->mTitle->isContentPage() ) {
 391                         return false;
 392                 }
 393
 394                 $text = $editInfo ? $editInfo->pst : false;
 395
 396                 if ( $this->isRedirect( $text ) ) {
 397                         return false;
 398                 }
 399
 400                 switch ( $wgArticleCountMethod ) {
 401                 case 'any':
 402                         return true;
 403                 case 'comma':
 404                         if ( $text === false ) {
 405                                 $text = $this->getRawText();
 406                         }
 407                         return strpos( $text,  ',' ) !== false;
 408                 case 'link':
 409                         if ( $editInfo ) {
 410                                 // ParserOutput::getLinks() is a 2D array of page links, so
 411                                 // to be really correct we would need to recurse in the array
 412                                 // but the main array should only have items in it if there are
 413                                 // links.
 414                                 return (bool)count( $editInfo->output->getLinks() );
 415                         } else {
 416                                 return (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 417                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 418                         }
 419                 }
 420         }
 421
 422         /**
 423          * Tests if the article text represents a redirect
 424          *
 425          * @param $text mixed string containing article contents, or boolean
 426          * @return bool
 427          */
 428         public function isRedirect( $text = false ) {
 429                 if ( $text === false ) {
 430                         if ( !$this->mDataLoaded ) {
 431                                 $this->loadPageData();
 432                         }
 433
 434                         return (bool)$this->mIsRedirect;
 435                 } else {
 436                         return Title::newFromRedirect( $text ) !== null;
 437                 }
 438         }
 439
 440         /**
 441          * Loads everything except the text
 442          * This isn't necessary for all uses, so it's only done if needed.
 443          */
 444         protected function loadLastEdit() {
 445                 if ( $this->mLastRevision !== null ) {
 446                         return; // already loaded
 447                 }
 448
 449                 # New or non-existent articles have no user information
 450                 $id = $this->getID();
 451                 if ( 0 == $id ) {
 452                         return;
 453                 }
 454
 455                 $revision = Revision::loadFromPageId( wfGetDB( DB_MASTER ), $id );
 456                 if ( $revision ) {
 457                         $this->setLastEdit( $revision );
 458                 }
 459         }
 460
 461         /**
 462          * Set the latest revision
 463          */
 464         protected function setLastEdit( Revision $revision ) {
 465                 $this->mLastRevision = $revision;
 466                 $this->mTimestamp = $revision->getTimestamp();
 467         }
 468
 469         /**
 470          * Get the latest revision
 471          * @return Revision|false
 472          */
 473         public function getRevision() {
 474                 $this->loadLastEdit();
 475                 if ( $this->mLastRevision ) {
 476                         return $this->mLastRevision;
 477                 }
 478                 return false;
 479         }
 480
 481         /**
 482          * Get the text of the current revision. No side-effects...
 483          *
 484          * @param $audience Integer: one of:
 485          *      Revision::FOR_PUBLIC       to be displayed to all users
 486          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 487          *      Revision::RAW              get the text regardless of permissions
 488          * @return String|false The text of the current revision
 489          */
 490         public function getText( $audience = Revision::FOR_PUBLIC ) {
 491                 $this->loadLastEdit();
 492                 if ( $this->mLastRevision ) {
 493                         return $this->mLastRevision->getText( $audience );
 494                 }
 495                 return false;
 496         }
 497
 498         /**
 499          * Get the text of the current revision. No side-effects...
 500          *
 501          * @return String|false The text of the current revision
 502          */
 503         public function getRawText() {
 504                 $this->loadLastEdit();
 505                 if ( $this->mLastRevision ) {
 506                         return $this->mLastRevision->getRawText();
 507                 }
 508                 return false;
 509         }
 510
 511         /**
 512          * @return string MW timestamp of last article revision
 513          */
 514         public function getTimestamp() {
 515                 // Check if the field has been filled by ParserCache::get()
 516                 if ( !$this->mTimestamp ) {
 517                         $this->loadLastEdit();
 518                 }
 519                 return wfTimestamp( TS_MW, $this->mTimestamp );
 520         }
 521
 522         /**
 523          * Set the page timestamp (use only to avoid DB queries)
 524          * @param $ts string MW timestamp of last article revision
 525          * @return void
 526          */
 527         public function setTimestamp( $ts ) {
 528                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 529         }
 530
 531         /**
 532          * @param $audience Integer: one of:
 533          *      Revision::FOR_PUBLIC       to be displayed to all users
 534          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 535          *      Revision::RAW              get the text regardless of permissions
 536          * @return int user ID for the user that made the last article revision
 537          */
 538         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 539                 $this->loadLastEdit();
 540                 if ( $this->mLastRevision ) {
 541                         return $this->mLastRevision->getUser( $audience );
 542                 } else {
 543                         return -1;
 544                 }
 545         }
 546
 547         /**
 548          * @param $audience Integer: one of:
 549          *      Revision::FOR_PUBLIC       to be displayed to all users
 550          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 551          *      Revision::RAW              get the text regardless of permissions
 552          * @return string username of the user that made the last article revision
 553          */
 554         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 555                 $this->loadLastEdit();
 556                 if ( $this->mLastRevision ) {
 557                         return $this->mLastRevision->getUserText( $audience );
 558                 } else {
 559                         return '';
 560                 }
 561         }
 562
 563         /**
 564          * @param $audience Integer: one of:
 565          *      Revision::FOR_PUBLIC       to be displayed to all users
 566          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 567          *      Revision::RAW              get the text regardless of permissions
 568          * @return string Comment stored for the last article revision
 569          */
 570         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 571                 $this->loadLastEdit();
 572                 if ( $this->mLastRevision ) {
 573                         return $this->mLastRevision->getComment( $audience );
 574                 } else {
 575                         return '';
 576                 }
 577         }
 578
 579         /**
 580          * Returns true if last revision was marked as "minor edit"
 581          *
 582          * @return boolean Minor edit indicator for the last article revision.
 583          */
 584         public function getMinorEdit() {
 585                 $this->loadLastEdit();
 586                 if ( $this->mLastRevision ) {
 587                         return $this->mLastRevision->isMinor();
 588                 } else {
 589                         return false;
 590                 }
 591         }
 592
 593         /**
 594          * Get a list of users who have edited this article, not including the user who made
 595          * the most recent revision, which you can get from $article->getUser() if you want it
 596          * @return UserArrayFromResult
 597          */
 598         public function getContributors() {
 599                 # @todo FIXME: This is expensive; cache this info somewhere.
 600
 601                 $dbr = wfGetDB( DB_SLAVE );
 602
 603                 if ( $dbr->implicitGroupby() ) {
 604                         $realNameField = 'user_real_name';
 605                 } else {
 606                         $realNameField = 'FIRST(user_real_name) AS user_real_name';
 607                 }
 608
 609                 $tables = array( 'revision', 'user' );
 610
 611                 $fields = array(
 612                         'rev_user as user_id',
 613                         'rev_user_text AS user_name',
 614                         $realNameField,
 615                         'MAX(rev_timestamp) AS timestamp',
 616                 );
 617
 618                 $conds = array( 'rev_page' => $this->getId() );
 619
 620                 // The user who made the top revision gets credited as "this page was last edited by
 621                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 622                 $user = $this->getUser();
 623                 if ( $user ) {
 624                         $conds[] = "rev_user != $user";
 625                 } else {
 626                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 627                 }
 628
 629                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 630
 631                 $jconds = array(
 632                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 633                 );
 634
 635                 $options = array(
 636                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 637                         'ORDER BY' => 'timestamp DESC',
 638                 );
 639
 640                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 641                 return new UserArrayFromResult( $res );
 642         }
 643
 644         /**
 645          * Should the parser cache be used?
 646          *
 647          * @param $user User The relevant user
 648          * @return boolean
 649          */
 650         public function isParserCacheUsed( User $user, $oldid ) {
 651                 global $wgEnableParserCache;
 652
 653                 return $wgEnableParserCache
 654                         && $user->getStubThreshold() == 0
 655                         && $this->exists()
 656                         && empty( $oldid )
 657                         && !$this->mTitle->isCssOrJsPage()
 658                         && !$this->mTitle->isCssJsSubpage();
 659         }
 660
 661         /**
 662          * Perform the actions of a page purging
 663          */
 664         public function doPurge() {
 665                 global $wgUseSquid;
 666
 667                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
 668                         return false;
 669                 }
 670
 671                 // Invalidate the cache
 672                 $this->mTitle->invalidateCache();
 673                 $this->clear();
 674
 675                 if ( $wgUseSquid ) {
 676                         // Commit the transaction before the purge is sent
 677                         $dbw = wfGetDB( DB_MASTER );
 678                         $dbw->commit();
 679
 680                         // Send purge
 681                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 682                         $update->doUpdate();
 683                 }
 684
 685                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 686                         if ( $this->getID() == 0 ) {
 687                                 $text = false;
 688                         } else {
 689                                 $text = $this->getRawText();
 690                         }
 691
 692                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
 693                 }
 694         }
 695
 696         /**
 697          * Insert a new empty page record for this article.
 698          * This *must* be followed up by creating a revision
 699          * and running $this->updateRevisionOn( ... );
 700          * or else the record will be left in a funky state.
 701          * Best if all done inside a transaction.
 702          *
 703          * @param $dbw DatabaseBase
 704          * @return int The newly created page_id key, or false if the title already existed
 705          * @private
 706          */
 707         public function insertOn( $dbw ) {
 708                 wfProfileIn( __METHOD__ );
 709
 710                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 711                 $dbw->insert( 'page', array(
 712                         'page_id'           => $page_id,
 713                         'page_namespace'    => $this->mTitle->getNamespace(),
 714                         'page_title'        => $this->mTitle->getDBkey(),
 715                         'page_counter'      => 0,
 716                         'page_restrictions' => '',
 717                         'page_is_redirect'  => 0, # Will set this shortly...
 718                         'page_is_new'       => 1,
 719                         'page_random'       => wfRandom(),
 720                         'page_touched'      => $dbw->timestamp(),
 721                         'page_latest'       => 0, # Fill this in shortly...
 722                         'page_len'          => 0, # Fill this in shortly...
 723                 ), __METHOD__, 'IGNORE' );
 724
 725                 $affected = $dbw->affectedRows();
 726
 727                 if ( $affected ) {
 728                         $newid = $dbw->insertId();
 729                         $this->mTitle->resetArticleID( $newid );
 730                 }
 731                 wfProfileOut( __METHOD__ );
 732
 733                 return $affected ? $newid : false;
 734         }
 735
 736         /**
 737          * Update the page record to point to a newly saved revision.
 738          *
 739          * @param $dbw DatabaseBase: object
 740          * @param $revision Revision: For ID number, and text used to set
 741                                                 length and redirect status fields
 742          * @param $lastRevision Integer: if given, will not overwrite the page field
 743          *                      when different from the currently set value.
 744          *                      Giving 0 indicates the new page flag should be set
 745          *                      on.
 746          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
 747          *                           removing rows in redirect table.
 748          * @return bool true on success, false on failure
 749          * @private
 750          */
 751         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
 752                 wfProfileIn( __METHOD__ );
 753
 754                 $text = $revision->getText();
 755                 $rt = Title::newFromRedirectRecurse( $text );
 756
 757                 $conditions = array( 'page_id' => $this->getId() );
 758
 759                 if ( !is_null( $lastRevision ) ) {
 760                         # An extra check against threads stepping on each other
 761                         $conditions['page_latest'] = $lastRevision;
 762                 }
 763
 764                 $dbw->update( 'page',
 765                         array( /* SET */
 766                                 'page_latest'      => $revision->getId(),
 767                                 'page_touched'     => $dbw->timestamp(),
 768                                 'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
 769                                 'page_is_redirect' => $rt !== null ? 1 : 0,
 770                                 'page_len'         => strlen( $text ),
 771                         ),
 772                         $conditions,
 773                         __METHOD__ );
 774
 775                 $result = $dbw->affectedRows() != 0;
 776                 if ( $result ) {
 777                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
 778                 }
 779
 780                 wfProfileOut( __METHOD__ );
 781                 return $result;
 782         }
 783
 784         /**
 785          * Add row to the redirect table if this is a redirect, remove otherwise.
 786          *
 787          * @param $dbw DatabaseBase
 788          * @param $redirectTitle Title object pointing to the redirect target,
 789          *                       or NULL if this is not a redirect
 790          * @param $lastRevIsRedirect If given, will optimize adding and
 791          *                           removing rows in redirect table.
 792          * @return bool true on success, false on failure
 793          * @private
 794          */
 795         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
 796                 // Always update redirects (target link might have changed)
 797                 // Update/Insert if we don't know if the last revision was a redirect or not
 798                 // Delete if changing from redirect to non-redirect
 799                 $isRedirect = !is_null( $redirectTitle );
 800
 801                 if ( !$isRedirect && !is_null( $lastRevIsRedirect ) && $lastRevIsRedirect === $isRedirect ) {
 802                         return true;
 803                 }
 804
 805                 wfProfileIn( __METHOD__ );
 806                 if ( $isRedirect ) {
 807                         $this->insertRedirectEntry( $redirectTitle );
 808                 } else {
 809                         // This is not a redirect, remove row from redirect table
 810                         $where = array( 'rd_from' => $this->getId() );
 811                         $dbw->delete( 'redirect', $where, __METHOD__ );
 812                 }
 813
 814                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
 815                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
 816                 }
 817                 wfProfileOut( __METHOD__ );
 818
 819                 return ( $dbw->affectedRows() != 0 );
 820         }
 821
 822         /**
 823          * If the given revision is newer than the currently set page_latest,
 824          * update the page record. Otherwise, do nothing.
 825          *
 826          * @param $dbw Database object
 827          * @param $revision Revision object
 828          * @return mixed
 829          */
 830         public function updateIfNewerOn( $dbw, $revision ) {
 831                 wfProfileIn( __METHOD__ );
 832
 833                 $row = $dbw->selectRow(
 834                         array( 'revision', 'page' ),
 835                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
 836                         array(
 837                                 'page_id' => $this->getId(),
 838                                 'page_latest=rev_id' ),
 839                         __METHOD__ );
 840
 841                 if ( $row ) {
 842                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
 843                                 wfProfileOut( __METHOD__ );
 844                                 return false;
 845                         }
 846                         $prev = $row->rev_id;
 847                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
 848                 } else {
 849                         # No or missing previous revision; mark the page as new
 850                         $prev = 0;
 851                         $lastRevIsRedirect = null;
 852                 }
 853
 854                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
 855
 856                 wfProfileOut( __METHOD__ );
 857                 return $ret;
 858         }
 859
 860         /**
 861          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
 862          * @param $text String: new text of the section
 863          * @param $summary String: new section's subject, only if $section is 'new'
 864          * @param $edittime String: revision timestamp or null to use the current revision
 865          * @return string Complete article text, or null if error
 866          */
 867         public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
 868                 wfProfileIn( __METHOD__ );
 869
 870                 if ( strval( $section ) == '' ) {
 871                         // Whole-page edit; let the whole text through
 872                 } else {
 873                         if ( is_null( $edittime ) ) {
 874                                 $rev = Revision::newFromTitle( $this->mTitle );
 875                         } else {
 876                                 $dbw = wfGetDB( DB_MASTER );
 877                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
 878                         }
 879
 880                         if ( !$rev ) {
 881                                 wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
 882                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
 883                                 wfProfileOut( __METHOD__ );
 884                                 return null;
 885                         }
 886
 887                         $oldtext = $rev->getText();
 888
 889                         if ( $section == 'new' ) {
 890                                 # Inserting a new section
 891                                 $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
 892                                 $text = strlen( trim( $oldtext ) ) > 0
 893                                                 ? "{$oldtext}\n\n{$subject}{$text}"
 894                                                 : "{$subject}{$text}";
 895                         } else {
 896                                 # Replacing an existing section; roll out the big guns
 897                                 global $wgParser;
 898
 899                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
 900                         }
 901                 }
 902
 903                 wfProfileOut( __METHOD__ );
 904                 return $text;
 905         }
 906
 907         /**
 908          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
 909          * @param $flags Int
 910          * @return Int updated $flags
 911          */
 912         function checkFlags( $flags ) {
 913                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
 914                         if ( $this->mTitle->getArticleID() ) {
 915                                 $flags |= EDIT_UPDATE;
 916                         } else {
 917                                 $flags |= EDIT_NEW;
 918                         }
 919                 }
 920
 921                 return $flags;
 922         }
 923
 924         /**
 925          * Change an existing article or create a new article. Updates RC and all necessary caches,
 926          * optionally via the deferred update array.
 927          *
 928          * @param $text String: new text
 929          * @param $summary String: edit summary
 930          * @param $flags Integer bitfield:
 931          *      EDIT_NEW
 932          *          Article is known or assumed to be non-existent, create a new one
 933          *      EDIT_UPDATE
 934          *          Article is known or assumed to be pre-existing, update it
 935          *      EDIT_MINOR
 936          *          Mark this edit minor, if the user is allowed to do so
 937          *      EDIT_SUPPRESS_RC
 938          *          Do not log the change in recentchanges
 939          *      EDIT_FORCE_BOT
 940          *          Mark the edit a "bot" edit regardless of user rights
 941          *      EDIT_DEFER_UPDATES
 942          *          Defer some of the updates until the end of index.php
 943          *      EDIT_AUTOSUMMARY
 944          *          Fill in blank summaries with generated text where possible
 945          *
 946          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
 947          * If EDIT_UPDATE is specified and the article doesn't exist, the function will an
 948          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
 949          * edit-already-exists error will be returned. These two conditions are also possible with
 950          * auto-detection due to MediaWiki's performance-optimised locking strategy.
 951          *
 952          * @param $baseRevId the revision ID this edit was based off, if any
 953          * @param $user User the user doing the edit
 954          *
 955          * @return Status object. Possible errors:
 956          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
 957          *     edit-gone-missing:       In update mode, but the article didn't exist
 958          *     edit-conflict:           In update mode, the article changed unexpectedly
 959          *     edit-no-change:          Warning that the text was the same as before
 960          *     edit-already-exists:     In creation mode, but the article already exists
 961          *
 962          *  Extensions may define additional errors.
 963          *
 964          *  $return->value will contain an associative array with members as follows:
 965          *     new:                     Boolean indicating if the function attempted to create a new article
 966          *     revision:                The revision object for the inserted revision, or null
 967          *
 968          *  Compatibility note: this function previously returned a boolean value indicating success/failure
 969          */
 970         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
 971                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
 972
 973                 # Low-level sanity check
 974                 if ( $this->mTitle->getText() === '' ) {
 975                         throw new MWException( 'Something is trying to edit an article with an empty title' );
 976                 }
 977
 978                 wfProfileIn( __METHOD__ );
 979
 980                 $user = is_null( $user ) ? $wgUser : $user;
 981                 $status = Status::newGood( array() );
 982
 983                 # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
 984                 $this->loadPageData();
 985
 986                 $flags = $this->checkFlags( $flags );
 987
 988                 if ( !wfRunHooks( 'ArticleSave', array( &$this, &$user, &$text, &$summary,
 989                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) ) )
 990                 {
 991                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
 992
 993                         if ( $status->isOK() ) {
 994                                 $status->fatal( 'edit-hook-aborted' );
 995                         }
 996
 997                         wfProfileOut( __METHOD__ );
 998                         return $status;
 999                 }
1000
1001                 # Silently ignore EDIT_MINOR if not allowed
1002                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1003                 $bot = $flags & EDIT_FORCE_BOT;
1004
1005                 $oldtext = $this->getRawText(); // current revision
1006                 $oldsize = strlen( $oldtext );
1007
1008                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1009                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1010                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1011                 }
1012
1013                 $editInfo = $this->prepareTextForEdit( $text, null, $user );
1014                 $text = $editInfo->pst;
1015                 $newsize = strlen( $text );
1016
1017                 $dbw = wfGetDB( DB_MASTER );
1018                 $now = wfTimestampNow();
1019                 $this->mTimestamp = $now;
1020
1021                 if ( $flags & EDIT_UPDATE ) {
1022                         # Update article, but only if changed.
1023                         $status->value['new'] = false;
1024
1025                         # Make sure the revision is either completely inserted or not inserted at all
1026                         if ( !$wgDBtransactions ) {
1027                                 $userAbort = ignore_user_abort( true );
1028                         }
1029
1030                         $changed = ( strcmp( $text, $oldtext ) != 0 );
1031
1032                         if ( $changed ) {
1033                                 if ( !$this->mLatest ) {
1034                                         # Article gone missing
1035                                         wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1036                                         $status->fatal( 'edit-gone-missing' );
1037
1038                                         wfProfileOut( __METHOD__ );
1039                                         return $status;
1040                                 }
1041
1042                                 $revision = new Revision( array(
1043                                         'page'       => $this->getId(),
1044                                         'comment'    => $summary,
1045                                         'minor_edit' => $isminor,
1046                                         'text'       => $text,
1047                                         'parent_id'  => $this->mLatest,
1048                                         'user'       => $user->getId(),
1049                                         'user_text'  => $user->getName(),
1050                                         'timestamp'  => $now
1051                                 ) );
1052
1053                                 $dbw->begin();
1054                                 $revisionId = $revision->insertOn( $dbw );
1055
1056                                 # Update page
1057                                 #
1058                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1059                                 # during the course of this function. This makes sure that EditPage can detect
1060                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1061                                 # before this function is called. A previous function used a separate query, this
1062                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1063                                 $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
1064
1065                                 if ( !$ok ) {
1066                                         /* Belated edit conflict! Run away!! */
1067                                         $status->fatal( 'edit-conflict' );
1068
1069                                         # Delete the invalid revision if the DB is not transactional
1070                                         if ( !$wgDBtransactions ) {
1071                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1072                                         }
1073
1074                                         $revisionId = 0;
1075                                         $dbw->rollback();
1076                                 } else {
1077                                         global $wgUseRCPatrol;
1078                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1079                                         # Update recentchanges
1080                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1081                                                 # Mark as patrolled if the user can do so
1082                                                 $patrolled = $wgUseRCPatrol && !count(
1083                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1084                                                 # Add RC row to the DB
1085                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1086                                                         $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1087                                                         $revisionId, $patrolled
1088                                                 );
1089
1090                                                 # Log auto-patrolled edits
1091                                                 if ( $patrolled ) {
1092                                                         PatrolLog::record( $rc, true );
1093                                                 }
1094                                         }
1095                                         $user->incEditCount();
1096                                         $dbw->commit();
1097                                 }
1098                         } else {
1099                                 $status->warning( 'edit-no-change' );
1100                                 $revision = null;
1101                                 // Keep the same revision ID, but do some updates on it
1102                                 $revisionId = $this->getLatest();
1103                                 // Update page_touched, this is usually implicit in the page update
1104                                 // Other cache updates are done in onArticleEdit()
1105                                 $this->mTitle->invalidateCache();
1106                         }
1107
1108                         if ( !$wgDBtransactions ) {
1109                                 ignore_user_abort( $userAbort );
1110                         }
1111
1112                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1113                         if ( !$status->isOK() ) {
1114                                 wfProfileOut( __METHOD__ );
1115                                 return $status;
1116                         }
1117
1118                         # Invalidate cache of this article and all pages using this article
1119                         # as a template. Partly deferred.
1120                         self::onArticleEdit( $this->mTitle );
1121                         # Update links tables, site stats, etc.
1122                         $this->doEditUpdates( $text, $user, $summary, $isminor, $revisionId, $changed );
1123                 } else {
1124                         # Create new article
1125                         $status->value['new'] = true;
1126
1127                         $dbw->begin();
1128
1129                         # Add the page record; stake our claim on this title!
1130                         # This will return false if the article already exists
1131                         $newid = $this->insertOn( $dbw );
1132
1133                         if ( $newid === false ) {
1134                                 $dbw->rollback();
1135                                 $status->fatal( 'edit-already-exists' );
1136
1137                                 wfProfileOut( __METHOD__ );
1138                                 return $status;
1139                         }
1140
1141                         # Save the revision text...
1142                         $revision = new Revision( array(
1143                                 'page'       => $newid,
1144                                 'comment'    => $summary,
1145                                 'minor_edit' => $isminor,
1146                                 'text'       => $text,
1147                                 'user'       => $user->getId(),
1148                                 'user_text'  => $user->getName(),
1149                                 'timestamp'  => $now
1150                         ) );
1151                         $revisionId = $revision->insertOn( $dbw );
1152
1153                         $this->mTitle->resetArticleID( $newid );
1154                         # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
1155                         # @todo FIXME?
1156                         LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
1157
1158                         # Update the page record with revision data
1159                         $this->updateRevisionOn( $dbw, $revision, 0 );
1160
1161                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1162
1163                         # Update recentchanges
1164                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1165                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1166
1167                                 # Mark as patrolled if the user can do so
1168                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1169                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1170                                 # Add RC row to the DB
1171                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1172                                         '', strlen( $text ), $revisionId, $patrolled );
1173
1174                                 # Log auto-patrolled edits
1175                                 if ( $patrolled ) {
1176                                         PatrolLog::record( $rc, true );
1177                                 }
1178                         }
1179                         $user->incEditCount();
1180                         $dbw->commit();
1181
1182                         # Update links, etc.
1183                         $this->doEditUpdates( $text, $user, $summary, $isminor, $revisionId, true, true );
1184
1185                         # Clear caches
1186                         self::onArticleCreate( $this->mTitle );
1187
1188                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $text, $summary,
1189                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1190                 }
1191
1192                 # Do updates right now unless deferral was requested
1193                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1194                         wfDoUpdates();
1195                 }
1196
1197                 // Return the new revision (or null) to the caller
1198                 $status->value['revision'] = $revision;
1199
1200                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $text, $summary,
1201                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1202
1203                 # Promote user to any groups they meet the criteria for
1204                 $user->addAutopromoteOnceGroups( 'onEdit' );
1205
1206                 wfProfileOut( __METHOD__ );
1207                 return $status;
1208         }
1209
1210         /**
1211          * Update the article's restriction field, and leave a log entry.
1212          *
1213          * @param $limit Array: set of restriction keys
1214          * @param $reason String
1215          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
1216          * @param $expiry Array: per restriction type expiration
1217          * @param $user User The user updating the restrictions
1218          * @return bool true on success
1219          */
1220         public function updateRestrictions(
1221                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
1222         ) {
1223                 global $wgUser, $wgContLang;
1224                 $user = is_null( $user ) ? $wgUser : $user;
1225
1226                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
1227
1228                 $id = $this->mTitle->getArticleID();
1229
1230                 if ( $id <= 0 ) {
1231                         wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
1232                         return false;
1233                 }
1234
1235                 if ( wfReadOnly() ) {
1236                         wfDebug( "updateRestrictions failed: read-only\n" );
1237                         return false;
1238                 }
1239
1240                 if ( !$this->mTitle->userCan( 'protect' ) ) {
1241                         wfDebug( "updateRestrictions failed: insufficient permissions\n" );
1242                         return false;
1243                 }
1244
1245                 if ( !$cascade ) {
1246                         $cascade = false;
1247                 }
1248
1249                 // Take this opportunity to purge out expired restrictions
1250                 Title::purgeExpiredRestrictions();
1251
1252                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
1253                 # we expect a single selection, but the schema allows otherwise.
1254                 $current = array();
1255                 $updated = self::flattenRestrictions( $limit );
1256                 $changed = false;
1257
1258                 foreach ( $restrictionTypes as $action ) {
1259                         if ( isset( $expiry[$action] ) ) {
1260                                 # Get current restrictions on $action
1261                                 $aLimits = $this->mTitle->getRestrictions( $action );
1262                                 $current[$action] = implode( '', $aLimits );
1263                                 # Are any actual restrictions being dealt with here?
1264                                 $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
1265
1266                                 # If something changed, we need to log it. Checking $aRChanged
1267                                 # assures that "unprotecting" a page that is not protected does
1268                                 # not log just because the expiry was "changed".
1269                                 if ( $aRChanged && $this->mTitle->mRestrictionsExpiry[$action] != $expiry[$action] ) {
1270                                         $changed = true;
1271                                 }
1272                         }
1273                 }
1274
1275                 $current = self::flattenRestrictions( $current );
1276
1277                 $changed = ( $changed || $current != $updated );
1278                 $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
1279                 $protect = ( $updated != '' );
1280
1281                 # If nothing's changed, do nothing
1282                 if ( $changed ) {
1283                         if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
1284                                 $dbw = wfGetDB( DB_MASTER );
1285
1286                                 # Prepare a null revision to be added to the history
1287                                 $modified = $current != '' && $protect;
1288
1289                                 if ( $protect ) {
1290                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1291                                 } else {
1292                                         $comment_type = 'unprotectedarticle';
1293                                 }
1294
1295                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1296
1297                                 # Only restrictions with the 'protect' right can cascade...
1298                                 # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1299                                 $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
1300
1301                                 # The schema allows multiple restrictions
1302                                 if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
1303                                         $cascade = false;
1304                                 }
1305
1306                                 $cascade_description = '';
1307
1308                                 if ( $cascade ) {
1309                                         $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
1310                                 }
1311
1312                                 if ( $reason ) {
1313                                         $comment .= ": $reason";
1314                                 }
1315
1316                                 $editComment = $comment;
1317                                 $encodedExpiry = array();
1318                                 $protect_description = '';
1319                                 foreach ( $limit as $action => $restrictions ) {
1320                                         if ( !isset( $expiry[$action] ) )
1321                                                 $expiry[$action] = $dbw->getInfinity();
1322
1323                                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
1324                                         if ( $restrictions != '' ) {
1325                                                 $protect_description .= "[$action=$restrictions] (";
1326                                                 if ( $encodedExpiry[$action] != 'infinity' ) {
1327                                                         $protect_description .= wfMsgForContent( 'protect-expiring',
1328                                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
1329                                                                 $wgContLang->date( $expiry[$action], false, false ) ,
1330                                                                 $wgContLang->time( $expiry[$action], false, false ) );
1331                                                 } else {
1332                                                         $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
1333                                                 }
1334
1335                                                 $protect_description .= ') ';
1336                                         }
1337                                 }
1338                                 $protect_description = trim( $protect_description );
1339
1340                                 if ( $protect_description && $protect ) {
1341                                         $editComment .= " ($protect_description)";
1342                                 }
1343
1344                                 if ( $cascade ) {
1345                                         $editComment .= "$cascade_description";
1346                                 }
1347
1348                                 # Update restrictions table
1349                                 foreach ( $limit as $action => $restrictions ) {
1350                                         if ( $restrictions != '' ) {
1351                                                 $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
1352                                                         array( 'pr_page' => $id,
1353                                                                 'pr_type' => $action,
1354                                                                 'pr_level' => $restrictions,
1355                                                                 'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
1356                                                                 'pr_expiry' => $encodedExpiry[$action]
1357                                                         ),
1358                                                         __METHOD__
1359                                                 );
1360                                         } else {
1361                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1362                                                         'pr_type' => $action ), __METHOD__ );
1363                                         }
1364                                 }
1365
1366                                 # Insert a null revision
1367                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
1368                                 $nullRevId = $nullRevision->insertOn( $dbw );
1369
1370                                 $latest = $this->getLatest();
1371                                 # Update page record
1372                                 $dbw->update( 'page',
1373                                         array( /* SET */
1374                                                 'page_touched' => $dbw->timestamp(),
1375                                                 'page_restrictions' => '',
1376                                                 'page_latest' => $nullRevId
1377                                         ), array( /* WHERE */
1378                                                 'page_id' => $id
1379                                         ), __METHOD__
1380                                 );
1381
1382                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
1383                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
1384
1385                                 # Update the protection log
1386                                 $log = new LogPage( 'protect' );
1387                                 if ( $protect ) {
1388                                         $params = array( $protect_description, $cascade ? 'cascade' : '' );
1389                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
1390                                 } else {
1391                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1392                                 }
1393                         } # End hook
1394                 } # End "changed" check
1395
1396                 return true;
1397         }
1398
1399         /**
1400          * Take an array of page restrictions and flatten it to a string
1401          * suitable for insertion into the page_restrictions field.
1402          * @param $limit Array
1403          * @return String
1404          */
1405         protected static function flattenRestrictions( $limit ) {
1406                 if ( !is_array( $limit ) ) {
1407                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
1408                 }
1409
1410                 $bits = array();
1411                 ksort( $limit );
1412
1413                 foreach ( $limit as $action => $restrictions ) {
1414                         if ( $restrictions != '' ) {
1415                                 $bits[] = "$action=$restrictions";
1416                         }
1417                 }
1418
1419                 return implode( ':', $bits );
1420         }
1421
1422         /**
1423          * @return bool whether or not the page surpasses $wgDeleteRevisionsLimit revisions
1424          */
1425         public function isBigDeletion() {
1426                 global $wgDeleteRevisionsLimit;
1427
1428                 if ( $wgDeleteRevisionsLimit ) {
1429                         $revCount = $this->estimateRevisionCount();
1430
1431                         return $revCount > $wgDeleteRevisionsLimit;
1432                 }
1433
1434                 return false;
1435         }
1436
1437         /**
1438          * @return int approximate revision count
1439          */
1440         public function estimateRevisionCount() {
1441                 $dbr = wfGetDB( DB_SLAVE );
1442
1443                 // For an exact count...
1444                 // return $dbr->selectField( 'revision', 'COUNT(*)',
1445                 //      array( 'rev_page' => $this->getId() ), __METHOD__ );
1446                 return $dbr->estimateRowCount( 'revision', '*',
1447                         array( 'rev_page' => $this->getId() ), __METHOD__ );
1448         }
1449
1450         /**
1451          * Get the last N authors
1452          * @param $num Integer: number of revisions to get
1453          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1454          * @return array Array of authors, duplicates not removed
1455          */
1456         public function getLastNAuthors( $num, $revLatest = 0 ) {
1457                 wfProfileIn( __METHOD__ );
1458                 // First try the slave
1459                 // If that doesn't have the latest revision, try the master
1460                 $continue = 2;
1461                 $db = wfGetDB( DB_SLAVE );
1462
1463                 do {
1464                         $res = $db->select( array( 'page', 'revision' ),
1465                                 array( 'rev_id', 'rev_user_text' ),
1466                                 array(
1467                                         'page_namespace' => $this->mTitle->getNamespace(),
1468                                         'page_title' => $this->mTitle->getDBkey(),
1469                                         'rev_page = page_id'
1470                                 ), __METHOD__,
1471                                 array(
1472                                         'ORDER BY' => 'rev_timestamp DESC',
1473                                         'LIMIT' => $num
1474                                 )
1475                         );
1476
1477                         if ( !$res ) {
1478                                 wfProfileOut( __METHOD__ );
1479                                 return array();
1480                         }
1481
1482                         $row = $db->fetchObject( $res );
1483
1484                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1485                                 $db = wfGetDB( DB_MASTER );
1486                                 $continue--;
1487                         } else {
1488                                 $continue = 0;
1489                         }
1490                 } while ( $continue );
1491
1492                 $authors = array( $row->rev_user_text );
1493
1494                 foreach ( $res as $row ) {
1495                         $authors[] = $row->rev_user_text;
1496                 }
1497
1498                 wfProfileOut( __METHOD__ );
1499                 return $authors;
1500         }
1501
1502         /**
1503          * Back-end article deletion
1504          * Deletes the article with database consistency, writes logs, purges caches
1505          *
1506          * @param $reason string delete reason for deletion log
1507          * @param suppress bitfield
1508          *      Revision::DELETED_TEXT
1509          *      Revision::DELETED_COMMENT
1510          *      Revision::DELETED_USER
1511          *      Revision::DELETED_RESTRICTED
1512          * @param $id int article ID
1513          * @param $commit boolean defaults to true, triggers transaction end
1514          * @param &$errors Array of errors to append to
1515          * @param $user User The relevant user
1516          * @return boolean true if successful
1517          */
1518         public function doDeleteArticle(
1519                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
1520         ) {
1521                 global $wgDeferredUpdateList, $wgUseTrackbacks, $wgUser;
1522                 $user = is_null( $user ) ? $wgUser : $user;
1523
1524                 wfDebug( __METHOD__ . "\n" );
1525
1526                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
1527                         return false;
1528                 }
1529                 $dbw = wfGetDB( DB_MASTER );
1530                 $t = $this->mTitle->getDBkey();
1531                 $id = $id ? $id : $this->mTitle->getArticleID( Title::GAID_FOR_UPDATE );
1532
1533                 if ( $t === '' || $id == 0 ) {
1534                         return false;
1535                 }
1536
1537                 $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
1538                 array_push( $wgDeferredUpdateList, $u );
1539
1540                 // Bitfields to further suppress the content
1541                 if ( $suppress ) {
1542                         $bitfield = 0;
1543                         // This should be 15...
1544                         $bitfield |= Revision::DELETED_TEXT;
1545                         $bitfield |= Revision::DELETED_COMMENT;
1546                         $bitfield |= Revision::DELETED_USER;
1547                         $bitfield |= Revision::DELETED_RESTRICTED;
1548                 } else {
1549                         $bitfield = 'rev_deleted';
1550                 }
1551
1552                 $dbw->begin();
1553                 // For now, shunt the revision data into the archive table.
1554                 // Text is *not* removed from the text table; bulk storage
1555                 // is left intact to avoid breaking block-compression or
1556                 // immutable storage schemes.
1557                 //
1558                 // For backwards compatibility, note that some older archive
1559                 // table entries will have ar_text and ar_flags fields still.
1560                 //
1561                 // In the future, we may keep revisions and mark them with
1562                 // the rev_deleted field, which is reserved for this purpose.
1563                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1564                         array(
1565                                 'ar_namespace'  => 'page_namespace',
1566                                 'ar_title'      => 'page_title',
1567                                 'ar_comment'    => 'rev_comment',
1568                                 'ar_user'       => 'rev_user',
1569                                 'ar_user_text'  => 'rev_user_text',
1570                                 'ar_timestamp'  => 'rev_timestamp',
1571                                 'ar_minor_edit' => 'rev_minor_edit',
1572                                 'ar_rev_id'     => 'rev_id',
1573                                 'ar_text_id'    => 'rev_text_id',
1574                                 'ar_text'       => '\'\'', // Be explicit to appease
1575                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
1576                                 'ar_len'        => 'rev_len',
1577                                 'ar_page_id'    => 'page_id',
1578                                 'ar_deleted'    => $bitfield
1579                         ), array(
1580                                 'page_id' => $id,
1581                                 'page_id = rev_page'
1582                         ), __METHOD__
1583                 );
1584
1585                 # Delete restrictions for it
1586                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
1587
1588                 # Now that it's safely backed up, delete it
1589                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
1590                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleId() uses slave, could be laggy
1591
1592                 if ( !$ok ) {
1593                         $dbw->rollback();
1594                         return false;
1595                 }
1596
1597                 # Fix category table counts
1598                 $cats = array();
1599                 $res = $dbw->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
1600
1601                 foreach ( $res as $row ) {
1602                         $cats [] = $row->cl_to;
1603                 }
1604
1605                 $this->updateCategoryCounts( array(), $cats );
1606
1607                 # If using cascading deletes, we can skip some explicit deletes
1608                 if ( !$dbw->cascadingDeletes() ) {
1609                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
1610
1611                         if ( $wgUseTrackbacks )
1612                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
1613
1614                         # Delete outgoing links
1615                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1616                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1617                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1618                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
1619                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
1620                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
1621                         $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ) );
1622                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
1623                 }
1624
1625                 # If using cleanup triggers, we can skip some manual deletes
1626                 if ( !$dbw->cleanupTriggers() ) {
1627                         # Clean up recentchanges entries...
1628                         $dbw->delete( 'recentchanges',
1629                                 array( 'rc_type != ' . RC_LOG,
1630                                         'rc_namespace' => $this->mTitle->getNamespace(),
1631                                         'rc_title' => $this->mTitle->getDBkey() ),
1632                                 __METHOD__ );
1633                         $dbw->delete( 'recentchanges',
1634                                 array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
1635                                 __METHOD__ );
1636                 }
1637
1638                 # Clear caches
1639                 self::onArticleDelete( $this->mTitle );
1640
1641                 # Clear the cached article id so the interface doesn't act like we exist
1642                 $this->mTitle->resetArticleID( 0 );
1643
1644                 # Log the deletion, if the page was suppressed, log it at Oversight instead
1645                 $logtype = $suppress ? 'suppress' : 'delete';
1646                 $log = new LogPage( $logtype );
1647
1648                 # Make sure logging got through
1649                 $log->addEntry( 'delete', $this->mTitle, $reason, array() );
1650
1651                 if ( $commit ) {
1652                         $dbw->commit();
1653                 }
1654
1655                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
1656                 return true;
1657         }
1658
1659         /**
1660          * Roll back the most recent consecutive set of edits to a page
1661          * from the same user; fails if there are no eligible edits to
1662          * roll back to, e.g. user is the sole contributor. This function
1663          * performs permissions checks on $user, then calls commitRollback()
1664          * to do the dirty work
1665          *
1666          * @param $fromP String: Name of the user whose edits to rollback.
1667          * @param $summary String: Custom summary. Set to default summary if empty.
1668          * @param $token String: Rollback token.
1669          * @param $bot Boolean: If true, mark all reverted edits as bot.
1670          *
1671          * @param $resultDetails Array: contains result-specific array of additional values
1672          *    'alreadyrolled' : 'current' (rev)
1673          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
1674          *
1675          * @param $user User The user performing the rollback
1676          * @return array of errors, each error formatted as
1677          *   array(messagekey, param1, param2, ...).
1678          * On success, the array is empty.  This array can also be passed to
1679          * OutputPage::showPermissionsErrorPage().
1680          */
1681         public function doRollback(
1682                 $fromP, $summary, $token, $bot, &$resultDetails, User $user = null
1683         ) {
1684                 global $wgUser;
1685                 $user = is_null( $user ) ? $wgUser : $user;
1686
1687                 $resultDetails = null;
1688
1689                 # Check permissions
1690                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
1691                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
1692                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
1693
1694                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
1695                         $errors[] = array( 'sessionfailure' );
1696                 }
1697
1698                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
1699                         $errors[] = array( 'actionthrottledtext' );
1700                 }
1701
1702                 # If there were errors, bail out now
1703                 if ( !empty( $errors ) ) {
1704                         return $errors;
1705                 }
1706
1707                 return $this->commitRollback( $user, $fromP, $summary, $bot, $resultDetails );
1708         }
1709
1710         /**
1711          * Backend implementation of doRollback(), please refer there for parameter
1712          * and return value documentation
1713          *
1714          * NOTE: This function does NOT check ANY permissions, it just commits the
1715          * rollback to the DB Therefore, you should only call this function direct-
1716          * ly if you want to use custom permissions checks. If you don't, use
1717          * doRollback() instead.
1718          * @param $fromP String: Name of the user whose edits to rollback.
1719          * @param $summary String: Custom summary. Set to default summary if empty.
1720          * @param $bot Boolean: If true, mark all reverted edits as bot.
1721          *
1722          * @param $resultDetails Array: contains result-specific array of additional values
1723          * @param $guser User The user performing the rollback
1724          */
1725         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
1726                 global $wgUseRCPatrol, $wgUser, $wgContLang;
1727                 $guser = is_null( $guser ) ? $wgUser : $guser;
1728
1729                 $dbw = wfGetDB( DB_MASTER );
1730
1731                 if ( wfReadOnly() ) {
1732                         return array( array( 'readonlytext' ) );
1733                 }
1734
1735                 # Get the last editor
1736                 $current = Revision::newFromTitle( $this->mTitle );
1737                 if ( is_null( $current ) ) {
1738                         # Something wrong... no page?
1739                         return array( array( 'notanarticle' ) );
1740                 }
1741
1742                 $from = str_replace( '_', ' ', $fromP );
1743                 # User name given should match up with the top revision.
1744                 # If the user was deleted then $from should be empty.
1745                 if ( $from != $current->getUserText() ) {
1746                         $resultDetails = array( 'current' => $current );
1747                         return array( array( 'alreadyrolled',
1748                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
1749                                 htmlspecialchars( $fromP ),
1750                                 htmlspecialchars( $current->getUserText() )
1751                         ) );
1752                 }
1753
1754                 # Get the last edit not by this guy...
1755                 # Note: these may not be public values
1756                 $user = intval( $current->getRawUser() );
1757                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
1758                 $s = $dbw->selectRow( 'revision',
1759                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
1760                         array( 'rev_page' => $current->getPage(),
1761                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
1762                         ), __METHOD__,
1763                         array( 'USE INDEX' => 'page_timestamp',
1764                                 'ORDER BY' => 'rev_timestamp DESC' )
1765                         );
1766                 if ( $s === false ) {
1767                         # No one else ever edited this page
1768                         return array( array( 'cantrollback' ) );
1769                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
1770                         # Only admins can see this text
1771                         return array( array( 'notvisiblerev' ) );
1772                 }
1773
1774                 $set = array();
1775                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
1776                         # Mark all reverted edits as bot
1777                         $set['rc_bot'] = 1;
1778                 }
1779
1780                 if ( $wgUseRCPatrol ) {
1781                         # Mark all reverted edits as patrolled
1782                         $set['rc_patrolled'] = 1;
1783                 }
1784
1785                 if ( count( $set ) ) {
1786                         $dbw->update( 'recentchanges', $set,
1787                                 array( /* WHERE */
1788                                         'rc_cur_id' => $current->getPage(),
1789                                         'rc_user_text' => $current->getUserText(),
1790                                         "rc_timestamp > '{$s->rev_timestamp}'",
1791                                 ), __METHOD__
1792                         );
1793                 }
1794
1795                 # Generate the edit summary if necessary
1796                 $target = Revision::newFromId( $s->rev_id );
1797                 if ( empty( $summary ) ) {
1798                         if ( $from == '' ) { // no public user name
1799                                 $summary = wfMsgForContent( 'revertpage-nouser' );
1800                         } else {
1801                                 $summary = wfMsgForContent( 'revertpage' );
1802                         }
1803                 }
1804
1805                 # Allow the custom summary to use the same args as the default message
1806                 $args = array(
1807                         $target->getUserText(), $from, $s->rev_id,
1808                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
1809                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
1810                 );
1811                 $summary = wfMsgReplaceArgs( $summary, $args );
1812
1813                 # Save
1814                 $flags = EDIT_UPDATE;
1815
1816                 if ( $guser->isAllowed( 'minoredit' ) ) {
1817                         $flags |= EDIT_MINOR;
1818                 }
1819
1820                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
1821                         $flags |= EDIT_FORCE_BOT;
1822                 }
1823
1824                 # Actually store the edit
1825                 $status = $this->doEdit( $target->getText(), $summary, $flags, $target->getId() );
1826                 if ( !empty( $status->value['revision'] ) ) {
1827                         $revId = $status->value['revision']->getId();
1828                 } else {
1829                         $revId = false;
1830                 }
1831
1832                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
1833
1834                 $resultDetails = array(
1835                         'summary' => $summary,
1836                         'current' => $current,
1837                         'target'  => $target,
1838                         'newid'   => $revId
1839                 );
1840
1841                 return array();
1842         }
1843
1844         /**
1845          * Do standard deferred updates after page view
1846          * @param $user User The relevant user
1847          */
1848         public function doViewUpdates( User $user ) {
1849                 global $wgDeferredUpdateList, $wgDisableCounters;
1850                 if ( wfReadOnly() ) {
1851                         return;
1852                 }
1853
1854                 # Don't update page view counters on views from bot users (bug 14044)
1855                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getID() ) {
1856                         $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getID() );
1857                         $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
1858                 }
1859
1860                 # Update newtalk / watchlist notification status
1861                 $user->clearNotification( $this->mTitle );
1862         }
1863
1864         /**
1865          * Prepare text which is about to be saved.
1866          * Returns a stdclass with source, pst and output members
1867          */
1868         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1869                 global $wgParser, $wgUser;
1870                 $user = is_null( $user ) ? $wgUser : $user;
1871                 // @TODO fixme: check $user->getId() here???
1872                 if ( $this->mPreparedEdit
1873                         && $this->mPreparedEdit->newText == $text
1874                         && $this->mPreparedEdit->revid == $revid
1875                 ) {
1876                         // Already prepared
1877                         return $this->mPreparedEdit;
1878                 }
1879
1880                 $popts = ParserOptions::newFromUser( $user );
1881                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1882
1883                 $edit = (object)array();
1884                 $edit->revid = $revid;
1885                 $edit->newText = $text;
1886                 $edit->pst = $this->preSaveTransform( $text, $user, $popts );
1887                 $edit->popts = $this->getParserOptions( true );
1888                 $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
1889                 $edit->oldText = $this->getRawText();
1890
1891                 $this->mPreparedEdit = $edit;
1892
1893                 return $edit;
1894         }
1895
1896         /**
1897          * Do standard deferred updates after page edit.
1898          * Update links tables, site stats, search index and message cache.
1899          * Purges pages that include this page if the text was changed here.
1900          * Every 100th edit, prune the recent changes table.
1901          *
1902          * @private
1903          * @param $text String: New text of the article
1904          * @param $user User object: User doing the edit
1905          * @param $summary String: Edit summary
1906          * @param $minoredit Boolean: Minor edit
1907          * @param $newid Integer: rev_id value of the new revision
1908          * @param $changed Boolean: Whether or not the content actually changed
1909          * @param $created Boolean: Whether the edit created the page
1910          */
1911         public function doEditUpdates(
1912                 $text, $user, $summary, $minoredit, $newid, $changed = true, $created = false
1913         ) {
1914                 global $wgDeferredUpdateList, $wgEnableParserCache;
1915
1916                 wfProfileIn( __METHOD__ );
1917
1918                 # Parse the text
1919                 # Be careful not to double-PST: $text is usually already PST-ed once
1920                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1921                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1922                         $editInfo = $this->prepareTextForEdit( $text, $newid, $user );
1923                 } else {
1924                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1925                         $editInfo = $this->mPreparedEdit;
1926                 }
1927
1928                 # Save it to the parser cache
1929                 if ( $wgEnableParserCache ) {
1930                         $parserCache = ParserCache::singleton();
1931                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1932                 }
1933
1934                 # Update the links tables
1935                 $u = new LinksUpdate( $this->mTitle, $editInfo->output );
1936                 $u->doUpdate();
1937
1938                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $changed ) );
1939
1940                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
1941                         if ( 0 == mt_rand( 0, 99 ) ) {
1942                                 // Flush old entries from the `recentchanges` table; we do this on
1943                                 // random requests so as to avoid an increase in writes for no good reason
1944                                 global $wgRCMaxAge;
1945
1946                                 $dbw = wfGetDB( DB_MASTER );
1947                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
1948                                 $dbw->delete(
1949                                         'recentchanges',
1950                                         array( "rc_timestamp < '$cutoff'" ),
1951                                         __METHOD__
1952                                 );
1953                         }
1954                 }
1955
1956                 $id = $this->getID();
1957                 $title = $this->mTitle->getPrefixedDBkey();
1958                 $shortTitle = $this->mTitle->getDBkey();
1959
1960                 if ( 0 == $id ) {
1961                         wfProfileOut( __METHOD__ );
1962                         return;
1963                 }
1964
1965                 if ( !$changed ) {
1966                         $good = 0;
1967                         $total = 0;
1968                 } elseif ( $created ) {
1969                         $good = (int)$this->isCountable( $editInfo );
1970                         $total = 1;
1971                 } else {
1972                         $good = (int)$this->isCountable( $editInfo ) - (int)$this->isCountable();
1973                         $total = 0;
1974                 }
1975
1976                 $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
1977                 $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
1978
1979                 # If this is another user's talk page, update newtalk
1980                 # Don't do this if $changed = false otherwise some idiot can null-edit a
1981                 # load of user talk pages and piss people off, nor if it's a minor edit
1982                 # by a properly-flagged bot.
1983                 if ( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $user->getTitleKey() && $changed
1984                         && !( $minoredit && $user->isAllowed( 'nominornewtalk' ) )
1985                 ) {
1986                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
1987                                 $other = User::newFromName( $shortTitle, false );
1988                                 if ( !$other ) {
1989                                         wfDebug( __METHOD__ . ": invalid username\n" );
1990                                 } elseif ( User::isIP( $shortTitle ) ) {
1991                                         // An anonymous user
1992                                         $other->setNewtalk( true );
1993                                 } elseif ( $other->isLoggedIn() ) {
1994                                         $other->setNewtalk( true );
1995                                 } else {
1996                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
1997                                 }
1998                         }
1999                 }
2000
2001                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2002                         MessageCache::singleton()->replace( $shortTitle, $text );
2003                 }
2004
2005                 wfProfileOut( __METHOD__ );
2006         }
2007
2008         /**
2009          * Perform article updates on a special page creation.
2010          *
2011          * @param $rev Revision object
2012          *
2013          * @todo This is a shitty interface function. Kill it and replace the
2014          * other shitty functions like doEditUpdates and such so it's not needed
2015          * anymore.
2016          * @deprecated since 1.19, use doEditUpdates()
2017          */
2018         public function createUpdates( $rev ) {
2019                 global $wgUser;
2020                 $this->doEditUpdates( $rev->getText(), $wgUser, $rev->getComment(),
2021                         $rev->isMinor(), $rev->getId(), true, true );
2022         }
2023
2024         /**
2025          * This function is called right before saving the wikitext,
2026          * so we can do things like signatures and links-in-context.
2027          *
2028          * @param $text String article contents
2029          * @param $user User object: user doing the edit
2030          * @param $popts ParserOptions object: parser options, default options for
2031          *               the user loaded if null given
2032          * @return string article contents with altered wikitext markup (signatures
2033          *      converted, {{subst:}}, templates, etc.)
2034          */
2035         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
2036                 global $wgParser, $wgUser;
2037                 $user = is_null( $user ) ? $wgUser : $user;
2038
2039                 if ( $popts === null ) {
2040                         $popts = ParserOptions::newFromUser( $user );
2041                 }
2042
2043                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
2044         }
2045
2046         /**
2047          * Loads page_touched and returns a value indicating if it should be used
2048          * @return boolean true if not a redirect
2049          */
2050         public function checkTouched() {
2051                 if ( !$this->mDataLoaded ) {
2052                         $this->loadPageData();
2053                 }
2054
2055                 return !$this->mIsRedirect;
2056         }
2057
2058         /**
2059          * Get the page_touched field
2060          * @return string containing GMT timestamp
2061          */
2062         public function getTouched() {
2063                 if ( !$this->mDataLoaded ) {
2064                         $this->loadPageData();
2065                 }
2066
2067                 return $this->mTouched;
2068         }
2069
2070         /**
2071          * Get the page_latest field
2072          * @return integer rev_id of current revision
2073          */
2074         public function getLatest() {
2075                 if ( !$this->mDataLoaded ) {
2076                         $this->loadPageData();
2077                 }
2078
2079                 return (int)$this->mLatest;
2080         }
2081
2082         /**
2083          * Edit an article without doing all that other stuff
2084          * The article must already exist; link tables etc
2085          * are not updated, caches are not flushed.
2086          *
2087          * @param $text String: text submitted
2088          * @param $user User The relevant user
2089          * @param $comment String: comment submitted
2090          * @param $minor Boolean: whereas it's a minor modification
2091          */
2092         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2093                 wfProfileIn( __METHOD__ );
2094
2095                 $dbw = wfGetDB( DB_MASTER );
2096                 $revision = new Revision( array(
2097                         'page'       => $this->getId(),
2098                         'text'       => $text,
2099                         'comment'    => $comment,
2100                         'minor_edit' => $minor ? 1 : 0,
2101                 ) );
2102                 $revision->insertOn( $dbw );
2103                 $this->updateRevisionOn( $dbw, $revision );
2104
2105                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2106
2107                 wfProfileOut( __METHOD__ );
2108         }
2109
2110         /**
2111          * The onArticle*() functions are supposed to be a kind of hooks
2112          * which should be called whenever any of the specified actions
2113          * are done.
2114          *
2115          * This is a good place to put code to clear caches, for instance.
2116          *
2117          * This is called on page move and undelete, as well as edit
2118          *
2119          * @param $title Title object
2120          */
2121         public static function onArticleCreate( $title ) {
2122                 # Update existence markers on article/talk tabs...
2123                 if ( $title->isTalkPage() ) {
2124                         $other = $title->getSubjectPage();
2125                 } else {
2126                         $other = $title->getTalkPage();
2127                 }
2128
2129                 $other->invalidateCache();
2130                 $other->purgeSquid();
2131
2132                 $title->touchLinks();
2133                 $title->purgeSquid();
2134                 $title->deleteTitleProtection();
2135         }
2136
2137         /**
2138          * Clears caches when article is deleted
2139          *
2140          * @param $title Title
2141          */
2142         public static function onArticleDelete( $title ) {
2143                 # Update existence markers on article/talk tabs...
2144                 if ( $title->isTalkPage() ) {
2145                         $other = $title->getSubjectPage();
2146                 } else {
2147                         $other = $title->getTalkPage();
2148                 }
2149
2150                 $other->invalidateCache();
2151                 $other->purgeSquid();
2152
2153                 $title->touchLinks();
2154                 $title->purgeSquid();
2155
2156                 # File cache
2157                 HTMLFileCache::clearFileCache( $title );
2158
2159                 # Messages
2160                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2161                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2162                 }
2163
2164                 # Images
2165                 if ( $title->getNamespace() == NS_FILE ) {
2166                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2167                         $update->doUpdate();
2168                 }
2169
2170                 # User talk pages
2171                 if ( $title->getNamespace() == NS_USER_TALK ) {
2172                         $user = User::newFromName( $title->getText(), false );
2173                         $user->setNewtalk( false );
2174                 }
2175
2176                 # Image redirects
2177                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2178         }
2179
2180         /**
2181          * Purge caches on page update etc
2182          *
2183          * @param $title Title object
2184          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2185          */
2186         public static function onArticleEdit( $title ) {
2187                 global $wgDeferredUpdateList;
2188
2189                 // Invalidate caches of articles which include this page
2190                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
2191
2192                 // Invalidate the caches of all pages which redirect here
2193                 $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
2194
2195                 # Purge squid for this page only
2196                 $title->purgeSquid();
2197
2198                 # Clear file cache for this page only
2199                 HTMLFileCache::clearFileCache( $title );
2200         }
2201
2202         /**#@-*/
2203
2204         /**
2205          * Return a list of templates used by this article.
2206          * Uses the templatelinks table
2207          *
2208          * @return Array of Title objects
2209          */
2210         public function getUsedTemplates() {
2211                 $result = array();
2212                 $id = $this->mTitle->getArticleID();
2213
2214                 if ( $id == 0 ) {
2215                         return array();
2216                 }
2217
2218                 $dbr = wfGetDB( DB_SLAVE );
2219                 $res = $dbr->select( array( 'templatelinks' ),
2220                         array( 'tl_namespace', 'tl_title' ),
2221                         array( 'tl_from' => $id ),
2222                         __METHOD__ );
2223
2224                 if ( $res !== false ) {
2225                         foreach ( $res as $row ) {
2226                                 $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2227                         }
2228                 }
2229
2230                 return $result;
2231         }
2232
2233         /**
2234          * Returns a list of hidden categories this page is a member of.
2235          * Uses the page_props and categorylinks tables.
2236          *
2237          * @return Array of Title objects
2238          */
2239         public function getHiddenCategories() {
2240                 $result = array();
2241                 $id = $this->mTitle->getArticleID();
2242
2243                 if ( $id == 0 ) {
2244                         return array();
2245                 }
2246
2247                 $dbr = wfGetDB( DB_SLAVE );
2248                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2249                         array( 'cl_to' ),
2250                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2251                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2252                         __METHOD__ );
2253
2254                 if ( $res !== false ) {
2255                         foreach ( $res as $row ) {
2256                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2257                         }
2258                 }
2259
2260                 return $result;
2261         }
2262
2263         /**
2264         * Return an applicable autosummary if one exists for the given edit.
2265         * @param $oldtext String: the previous text of the page.
2266         * @param $newtext String: The submitted text of the page.
2267         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2268         * @return string An appropriate autosummary, or an empty string.
2269         */
2270         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2271                 global $wgContLang;
2272
2273                 # Decide what kind of autosummary is needed.
2274
2275                 # Redirect autosummaries
2276                 $ot = Title::newFromRedirect( $oldtext );
2277                 $rt = Title::newFromRedirect( $newtext );
2278
2279                 if ( is_object( $rt ) && ( !is_object( $ot ) || !$rt->equals( $ot ) || $ot->getFragment() != $rt->getFragment() ) ) {
2280                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2281                 }
2282
2283                 # New page autosummaries
2284                 if ( $flags & EDIT_NEW && strlen( $newtext ) ) {
2285                         # If they're making a new article, give its text, truncated, in the summary.
2286
2287                         $truncatedtext = $wgContLang->truncate(
2288                                 str_replace( "\n", ' ', $newtext ),
2289                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new' ) ) ) );
2290
2291                         return wfMsgForContent( 'autosumm-new', $truncatedtext );
2292                 }
2293
2294                 # Blanking autosummaries
2295                 if ( $oldtext != '' && $newtext == '' ) {
2296                         return wfMsgForContent( 'autosumm-blank' );
2297                 } elseif ( strlen( $oldtext ) > 10 * strlen( $newtext ) && strlen( $newtext ) < 500 ) {
2298                         # Removing more than 90% of the article
2299
2300                         $truncatedtext = $wgContLang->truncate(
2301                                 $newtext,
2302                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-replace' ) ) ) );
2303
2304                         return wfMsgForContent( 'autosumm-replace', $truncatedtext );
2305                 }
2306
2307                 # If we reach this point, there's no applicable autosummary for our case, so our
2308                 # autosummary is empty.
2309                 return '';
2310         }
2311
2312         /**
2313          * Get parser options suitable for rendering the primary article wikitext
2314          * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
2315          * @return mixed ParserOptions object or boolean false
2316          */
2317         public function getParserOptions( $canonical = false ) {
2318                 global $wgUser, $wgLanguageCode;
2319
2320                 if ( !$this->mParserOptions || $canonical ) {
2321                         $user = !$canonical ? $wgUser : new User;
2322                         $parserOptions = new ParserOptions( $user );
2323                         $parserOptions->setTidy( true );
2324                         $parserOptions->enableLimitReport();
2325
2326                         if ( $canonical ) {
2327                                 $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
2328                                 return $parserOptions;
2329                         }
2330                         $this->mParserOptions = $parserOptions;
2331                 }
2332                 // Clone to allow modifications of the return value without affecting cache
2333                 return clone $this->mParserOptions;
2334         }
2335
2336         /**
2337         * Get parser options suitable for rendering the primary article wikitext
2338         * @param User $user
2339         * @return ParserOptions
2340         */
2341         public function makeParserOptions( User $user ) {
2342                 $options = ParserOptions::newFromUser( $user );
2343                 $options->enableLimitReport(); // show inclusion/loop reports
2344                 $options->setTidy( true ); // fix bad HTML
2345                 return $options;
2346         }
2347
2348         /**
2349          * Update all the appropriate counts in the category table, given that
2350          * we've added the categories $added and deleted the categories $deleted.
2351          *
2352          * @param $added array   The names of categories that were added
2353          * @param $deleted array The names of categories that were deleted
2354          */
2355         public function updateCategoryCounts( $added, $deleted ) {
2356                 $ns = $this->mTitle->getNamespace();
2357                 $dbw = wfGetDB( DB_MASTER );
2358
2359                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2360                 # exist, we might legitimately not create it, but it's simpler to just
2361                 # create it and then give it a negative value, since the value is bogus
2362                 # anyway.
2363                 #
2364                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2365                 $insertCats = array_merge( $added, $deleted );
2366                 if ( !$insertCats ) {
2367                         # Okay, nothing to do
2368                         return;
2369                 }
2370
2371                 $insertRows = array();
2372
2373                 foreach ( $insertCats as $cat ) {
2374                         $insertRows[] = array(
2375                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2376                                 'cat_title' => $cat
2377                         );
2378                 }
2379                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2380
2381                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2382                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2383
2384                 if ( $ns == NS_CATEGORY ) {
2385                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2386                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2387                 } elseif ( $ns == NS_FILE ) {
2388                         $addFields[]    = 'cat_files = cat_files + 1';
2389                         $removeFields[] = 'cat_files = cat_files - 1';
2390                 }
2391
2392                 if ( $added ) {
2393                         $dbw->update(
2394                                 'category',
2395                                 $addFields,
2396                                 array( 'cat_title' => $added ),
2397                                 __METHOD__
2398                         );
2399                 }
2400
2401                 if ( $deleted ) {
2402                         $dbw->update(
2403                                 'category',
2404                                 $removeFields,
2405                                 array( 'cat_title' => $deleted ),
2406                                 __METHOD__
2407                         );
2408                 }
2409         }
2410
2411         /**
2412          * Lightweight method to get the parser output for a page, checking the parser cache
2413          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
2414          * consider, so it's not appropriate to use there.
2415          *
2416          * @since 1.16 (r52326) for LiquidThreads
2417          *
2418          * @param $oldid mixed integer Revision ID or null
2419          * @param $user User The relevant user
2420          * @return ParserOutput or false if the given revsion ID is not found
2421          */
2422         public function getParserOutput( $oldid = null, User $user = null ) {
2423                 global $wgEnableParserCache, $wgUser;
2424                 $user = is_null( $user ) ? $wgUser : $user;
2425
2426                 // Should the parser cache be used?
2427                 $useParserCache = $wgEnableParserCache &&
2428                         $user->getStubThreshold() == 0 &&
2429                         $this->exists() &&
2430                         $oldid === null;
2431
2432                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
2433
2434                 if ( $user->getStubThreshold() ) {
2435                         wfIncrStats( 'pcache_miss_stub' );
2436                 }
2437
2438                 if ( $useParserCache ) {
2439                         $parserOutput = ParserCache::singleton()->get( $this, $this->getParserOptions() );
2440                         if ( $parserOutput !== false ) {
2441                                 return $parserOutput;
2442                         }
2443                 }
2444
2445                 // Cache miss; parse and output it.
2446                 if ( $oldid === null ) {
2447                         $text = $this->getRawText();
2448                 } else {
2449                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
2450                         if ( $rev === null ) {
2451                                 return false;
2452                         }
2453                         $text = $rev->getText();
2454                 }
2455
2456                 return $this->getOutputFromWikitext( $text, $useParserCache );
2457         }
2458
2459         /*
2460         * @deprecated since 1.19
2461         */
2462         public function quickEdit( $text, $comment = '', $minor = 0 ) {
2463                 global $wgUser;
2464                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
2465         }
2466
2467         /*
2468         * @deprecated since 1.19
2469         */
2470         public function editUpdates(
2471                 $text, $summary, $minoredit, $timestamp_of_pagechange, $newid,
2472                 $changed = true, User $user = null, $created = false
2473         ) {
2474                 global $wgUser;
2475                 return $this->doEditUpdates( $text, $wgUser, $summary, $minoredit, $newid, $changed, $created );
2476         }
2477
2478         /*
2479         * @deprecated since 1.19
2480         */
2481         public function viewUpdates() {
2482                 global $wgUser;
2483                 return $this->doViewUpdates( $wgUser );
2484         }
2485
2486         /*
2487         * @deprecated since 1.19
2488         */
2489         public function useParserCache( $oldid ) {
2490                 global $wgUser;
2491                 return $this->isParserCacheUsed( $wgUser, $oldid );
2492         }
2493 }