includes/MediaWiki.php

   1 <?php
   2 /**
   3  * Helper class for the index.php entry point.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * The MediaWiki class is the helper class for the index.php entry point.
  25  */
  26 class MediaWiki {
  27         /**
  28          * @var IContextSource
  29          */
  30         private $context;
  31
  32         /**
  33          * @var Config
  34          */
  35         private $config;
  36
  37         /**
  38          * @param IContextSource|null $context
  39          */
  40         public function __construct( IContextSource $context = null ) {
  41                 if ( !$context ) {
  42                         $context = RequestContext::getMain();
  43                 }
  44
  45                 $this->context = $context;
  46                 $this->config = $context->getConfig();
  47         }
  48
  49         /**
  50          * Parse the request to get the Title object
  51          *
  52          * @return Title Title object to be $wgTitle
  53          */
  54         private function parseTitle() {
  55                 global $wgContLang;
  56
  57                 $request = $this->context->getRequest();
  58                 $curid = $request->getInt( 'curid' );
  59                 $title = $request->getVal( 'title' );
  60                 $action = $request->getVal( 'action', 'view' );
  61
  62                 if ( $request->getCheck( 'search' ) ) {
  63                         // Compatibility with old search URLs which didn't use Special:Search
  64                         // Just check for presence here, so blank requests still
  65                         // show the search page when using ugly URLs (bug 8054).
  66                         $ret = SpecialPage::getTitleFor( 'Search' );
  67                 } elseif ( $curid ) {
  68                         // URLs like this are generated by RC, because rc_title isn't always accurate
  69                         $ret = Title::newFromID( $curid );
  70                 } else {
  71                         $ret = Title::newFromURL( $title );
  72                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  73                         // in wikitext links to tell Parser to make a direct file link
  74                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  75                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  76                         }
  77                         // Check variant links so that interwiki links don't have to worry
  78                         // about the possible different language variants
  79                         if ( count( $wgContLang->getVariants() ) > 1
  80                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  81                         ) {
  82                                 $wgContLang->findVariantLink( $title, $ret );
  83                         }
  84                 }
  85
  86                 // If title is not provided, always allow oldid and diff to set the title.
  87                 // If title is provided, allow oldid and diff to override the title, unless
  88                 // we are talking about a special page which might use these parameters for
  89                 // other purposes.
  90                 if ( $ret === null || !$ret->isSpecialPage() ) {
  91                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
  92                         $oldid = $request->getInt( 'oldid' );
  93                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
  94                         // Allow oldid to override a changed or missing title
  95                         if ( $oldid ) {
  96                                 $rev = Revision::newFromId( $oldid );
  97                                 $ret = $rev ? $rev->getTitle() : $ret;
  98                         }
  99                 }
 100
 101                 // Use the main page as default title if nothing else has been provided
 102                 if ( $ret === null
 103                         && strval( $title ) === ''
 104                         && !$request->getCheck( 'curid' )
 105                         && $action !== 'delete'
 106                 ) {
 107                         $ret = Title::newMainPage();
 108                 }
 109
 110                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 111                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 112                 }
 113
 114                 return $ret;
 115         }
 116
 117         /**
 118          * Get the Title object that we'll be acting on, as specified in the WebRequest
 119          * @return Title
 120          */
 121         public function getTitle() {
 122                 if ( !$this->context->hasTitle() ) {
 123                         $this->context->setTitle( $this->parseTitle() );
 124                 }
 125                 return $this->context->getTitle();
 126         }
 127
 128         /**
 129          * Returns the name of the action that will be executed.
 130          *
 131          * @return string Action
 132          */
 133         public function getAction() {
 134                 static $action = null;
 135
 136                 if ( $action === null ) {
 137                         $action = Action::getActionName( $this->context );
 138                 }
 139
 140                 return $action;
 141         }
 142
 143         /**
 144          * Performs the request.
 145          * - bad titles
 146          * - read restriction
 147          * - local interwiki redirects
 148          * - redirect loop
 149          * - special pages
 150          * - normal pages
 151          *
 152          * @throws MWException|PermissionsError|BadTitleError|HttpError
 153          * @return void
 154          */
 155         private function performRequest() {
 156                 global $wgTitle;
 157
 158                 wfProfileIn( __METHOD__ );
 159
 160                 $request = $this->context->getRequest();
 161                 $requestTitle = $title = $this->context->getTitle();
 162                 $output = $this->context->getOutput();
 163                 $user = $this->context->getUser();
 164
 165                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 166                         $output->setPrintable();
 167                 }
 168
 169                 $unused = null; // To pass it by reference
 170                 Hooks::run( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 171
 172                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 173                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 174                         || $title->isSpecial( 'Badtitle' )
 175                 ) {
 176                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 177                         wfProfileOut( __METHOD__ );
 178                         throw new BadTitleError();
 179                 }
 180
 181                 // Check user's permissions to read this page.
 182                 // We have to check here to catch special pages etc.
 183                 // We will check again in Article::view().
 184                 $permErrors = $title->isSpecial( 'RunJobs' )
 185                         ? array() // relies on HMAC key signature alone
 186                         : $title->getUserPermissionsErrors( 'read', $user );
 187                 if ( count( $permErrors ) ) {
 188                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 189                         // $this->context->title set to the input title would allow anonymous users to
 190                         // determine whether a page exists, potentially leaking private data. In fact, the
 191                         // curid and oldid request  parameters would allow page titles to be enumerated even
 192                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 193                         // permissions error is displayed.
 194                         //
 195                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 196                         // still use $wgTitle.
 197
 198                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 199                         $this->context->setTitle( $badTitle );
 200                         $wgTitle = $badTitle;
 201
 202                         wfProfileOut( __METHOD__ );
 203                         throw new PermissionsError( 'read', $permErrors );
 204                 }
 205
 206                 $pageView = false; // was an article or special page viewed?
 207
 208                 // Interwiki redirects
 209                 if ( $title->isExternal() ) {
 210                         $rdfrom = $request->getVal( 'rdfrom' );
 211                         if ( $rdfrom ) {
 212                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 213                         } else {
 214                                 $query = $request->getValues();
 215                                 unset( $query['title'] );
 216                                 $url = $title->getFullURL( $query );
 217                         }
 218                         // Check for a redirect loop
 219                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 220                                 && $title->isLocal()
 221                         ) {
 222                                 // 301 so google et al report the target as the actual url.
 223                                 $output->redirect( $url, 301 );
 224                         } else {
 225                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 226                                 wfProfileOut( __METHOD__ );
 227                                 throw new BadTitleError();
 228                         }
 229                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 230                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 231                         && ( $request->getVal( 'title' ) === null
 232                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 233                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 234                         && Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 235                 ) {
 236                         if ( $title->isSpecialPage() ) {
 237                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 238                                 if ( $name ) {
 239                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 240                                 }
 241                         }
 242                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 243                         // Redirect to canonical url, make it a 301 to allow caching
 244                         if ( $targetUrl == $request->getFullRequestURL() ) {
 245                                 $message = "Redirect loop detected!\n\n" .
 246                                         "This means the wiki got confused about what page was " .
 247                                         "requested; this sometimes happens when moving a wiki " .
 248                                         "to a new server or changing the server configuration.\n\n";
 249
 250                                 if ( $this->config->get( 'UsePathInfo' ) ) {
 251                                         $message .= "The wiki is trying to interpret the page " .
 252                                                 "title from the URL path portion (PATH_INFO), which " .
 253                                                 "sometimes fails depending on the web server. Try " .
 254                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 255                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 256                                                 "is correct.";
 257                                 } else {
 258                                         $message .= "Your web server was detected as possibly not " .
 259                                                 "supporting URL path components (PATH_INFO) correctly; " .
 260                                                 "check your LocalSettings.php for a customized " .
 261                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 262                                                 "to true.";
 263                                 }
 264                                 throw new HttpError( 500, $message );
 265                         } else {
 266                                 $output->setSquidMaxage( 1200 );
 267                                 $output->redirect( $targetUrl, '301' );
 268                         }
 269                 // Special pages
 270                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 271                         $pageView = true;
 272                         // Actions that need to be made when we have a special pages
 273                         SpecialPageFactory::executePath( $title, $this->context );
 274                 } else {
 275                         // ...otherwise treat it as an article view. The article
 276                         // may be a redirect to another article or URL.
 277                         $article = $this->initializeArticle();
 278                         if ( is_object( $article ) ) {
 279                                 $pageView = true;
 280                                 $this->performAction( $article, $requestTitle );
 281                         } elseif ( is_string( $article ) ) {
 282                                 $output->redirect( $article );
 283                         } else {
 284                                 wfProfileOut( __METHOD__ );
 285                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 286                                         . " returned neither an object nor a URL" );
 287                         }
 288                 }
 289
 290                 if ( $pageView ) {
 291                         // Promote user to any groups they meet the criteria for
 292                         $user->addAutopromoteOnceGroups( 'onView' );
 293                 }
 294
 295                 wfProfileOut( __METHOD__ );
 296         }
 297
 298         /**
 299          * Initialize the main Article object for "standard" actions (view, etc)
 300          * Create an Article object for the page, following redirects if needed.
 301          *
 302          * @return mixed An Article, or a string to redirect to another URL
 303          */
 304         private function initializeArticle() {
 305                 wfProfileIn( __METHOD__ );
 306
 307                 $title = $this->context->getTitle();
 308                 if ( $this->context->canUseWikiPage() ) {
 309                         // Try to use request context wiki page, as there
 310                         // is already data from db saved in per process
 311                         // cache there from this->getAction() call.
 312                         $page = $this->context->getWikiPage();
 313                         $article = Article::newFromWikiPage( $page, $this->context );
 314                 } else {
 315                         // This case should not happen, but just in case.
 316                         $article = Article::newFromTitle( $title, $this->context );
 317                         $this->context->setWikiPage( $article->getPage() );
 318                 }
 319
 320                 // NS_MEDIAWIKI has no redirects.
 321                 // It is also used for CSS/JS, so performance matters here...
 322                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 323                         wfProfileOut( __METHOD__ );
 324                         return $article;
 325                 }
 326
 327                 $request = $this->context->getRequest();
 328
 329                 // Namespace might change when using redirects
 330                 // Check for redirects ...
 331                 $action = $request->getVal( 'action', 'view' );
 332                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 333                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 334                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 335                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 336                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 337                         // ... and the article is not a non-redirect image page with associated file
 338                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 339                 ) {
 340                         // Give extensions a change to ignore/handle redirects as needed
 341                         $ignoreRedirect = $target = false;
 342
 343                         Hooks::run( 'InitializeArticleMaybeRedirect',
 344                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 345
 346                         // Follow redirects only for... redirects.
 347                         // If $target is set, then a hook wanted to redirect.
 348                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 349                                 // Is the target already set by an extension?
 350                                 $target = $target ? $target : $article->followRedirect();
 351                                 if ( is_string( $target ) ) {
 352                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 353                                                 // we'll need to redirect
 354                                                 wfProfileOut( __METHOD__ );
 355                                                 return $target;
 356                                         }
 357                                 }
 358                                 if ( is_object( $target ) ) {
 359                                         // Rewrite environment to redirected article
 360                                         $rarticle = Article::newFromTitle( $target, $this->context );
 361                                         $rarticle->loadPageData();
 362                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 363                                                 $rarticle->setRedirectedFrom( $title );
 364                                                 $article = $rarticle;
 365                                                 $this->context->setTitle( $target );
 366                                                 $this->context->setWikiPage( $article->getPage() );
 367                                         }
 368                                 }
 369                         } else {
 370                                 $this->context->setTitle( $article->getTitle() );
 371                                 $this->context->setWikiPage( $article->getPage() );
 372                         }
 373                 }
 374
 375                 wfProfileOut( __METHOD__ );
 376                 return $article;
 377         }
 378
 379         /**
 380          * Perform one of the "standard" actions
 381          *
 382          * @param Page $page
 383          * @param Title $requestTitle The original title, before any redirects were applied
 384          */
 385         private function performAction( Page $page, Title $requestTitle ) {
 386                 wfProfileIn( __METHOD__ );
 387
 388                 $request = $this->context->getRequest();
 389                 $output = $this->context->getOutput();
 390                 $title = $this->context->getTitle();
 391                 $user = $this->context->getUser();
 392
 393                 if ( !Hooks::run( 'MediaWikiPerformAction',
 394                                 array( $output, $page, $title, $user, $request, $this ) )
 395                 ) {
 396                         wfProfileOut( __METHOD__ );
 397                         return;
 398                 }
 399
 400                 $act = $this->getAction();
 401
 402                 $action = Action::factory( $act, $page, $this->context );
 403
 404                 if ( $action instanceof Action ) {
 405                         # Let Squid cache things if we can purge them.
 406                         if ( $this->config->get( 'UseSquid' ) &&
 407                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 408                         ) {
 409                                 $output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
 410                         }
 411
 412                         $action->show();
 413                         wfProfileOut( __METHOD__ );
 414                         return;
 415                 }
 416
 417                 if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 418                         $output->setStatusCode( 404 );
 419                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 420                 }
 421
 422                 wfProfileOut( __METHOD__ );
 423         }
 424
 425         /**
 426          * Run the current MediaWiki instance
 427          * index.php just calls this
 428          */
 429         public function run() {
 430                 try {
 431                         $this->checkMaxLag();
 432                         try {
 433                                 $this->main();
 434                         } catch ( ErrorPageError $e ) {
 435                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 436                                 // they are not internal application faults. As with normal requests, this
 437                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 438                                 wfGetLBFactory()->commitMasterChanges();
 439                                 $e->report(); // display the GUI error
 440                         }
 441                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 442                                 fastcgi_finish_request();
 443                         }
 444                         $this->triggerJobs();
 445                         $this->restInPeace();
 446                 } catch ( Exception $e ) {
 447                         MWExceptionHandler::handleException( $e );
 448                 }
 449         }
 450
 451         /**
 452          * Checks if the request should abort due to a lagged server,
 453          * for given maxlag parameter.
 454          * @return bool
 455          */
 456         private function checkMaxLag() {
 457                 wfProfileIn( __METHOD__ );
 458                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 459                 if ( !is_null( $maxLag ) ) {
 460                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 461                         if ( $lag > $maxLag ) {
 462                                 $resp = $this->context->getRequest()->response();
 463                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 464                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 465                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 466                                 $resp->header( 'Content-Type: text/plain' );
 467                                 if ( $this->config->get( 'ShowHostnames' ) ) {
 468                                         echo "Waiting for $host: $lag seconds lagged\n";
 469                                 } else {
 470                                         echo "Waiting for a database server: $lag seconds lagged\n";
 471                                 }
 472
 473                                 wfProfileOut( __METHOD__ );
 474
 475                                 exit;
 476                         }
 477                 }
 478                 wfProfileOut( __METHOD__ );
 479                 return true;
 480         }
 481
 482         private function main() {
 483                 global $wgTitle;
 484
 485                 wfProfileIn( __METHOD__ );
 486
 487                 $request = $this->context->getRequest();
 488
 489                 // Send Ajax requests to the Ajax dispatcher.
 490                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 491
 492                         // Set a dummy title, because $wgTitle == null might break things
 493                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 494                         $this->context->setTitle( $title );
 495                         $wgTitle = $title;
 496
 497                         $dispatcher = new AjaxDispatcher( $this->config );
 498                         $dispatcher->performAction( $this->context->getUser() );
 499                         wfProfileOut( __METHOD__ );
 500                         return;
 501                 }
 502
 503                 // Get title from request parameters,
 504                 // is set on the fly by parseTitle the first time.
 505                 $title = $this->getTitle();
 506                 $action = $this->getAction();
 507                 $wgTitle = $title;
 508
 509                 // If the user has forceHTTPS set to true, or if the user
 510                 // is in a group requiring HTTPS, or if they have the HTTPS
 511                 // preference set, redirect them to HTTPS.
 512                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 513                 // isLoggedIn() will do all sorts of weird stuff.
 514                 if (
 515                         $request->getProtocol() == 'http' &&
 516                         (
 517                                 $request->getCookie( 'forceHTTPS', '' ) ||
 518                                 // check for prefixed version for currently logged in users
 519                                 $request->getCookie( 'forceHTTPS' ) ||
 520                                 // Avoid checking the user and groups unless it's enabled.
 521                                 (
 522                                         $this->context->getUser()->isLoggedIn()
 523                                         && $this->context->getUser()->requiresHTTPS()
 524                                 )
 525                         )
 526                 ) {
 527                         $oldUrl = $request->getFullRequestURL();
 528                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 529
 530                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 531                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 532
 533                                 if ( $request->wasPosted() ) {
 534                                         // This is weird and we'd hope it almost never happens. This
 535                                         // means that a POST came in via HTTP and policy requires us
 536                                         // redirecting to HTTPS. It's likely such a request is going
 537                                         // to fail due to post data being lost, but let's try anyway
 538                                         // and just log the instance.
 539                                         //
 540                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 541                                         // to see how clients (automated & browser) behave when we do
 542                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 543                                 }
 544                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 545                                 $title = Title::newFromText( NS_MAIN, 'REDIR' );
 546                                 $this->context->setTitle( $title );
 547                                 $output = $this->context->getOutput();
 548                                 // Since we only do this redir to change proto, always send a vary header
 549                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 550                                 $output->redirect( $redirUrl );
 551                                 $output->output();
 552                                 wfProfileOut( __METHOD__ );
 553                                 return;
 554                         }
 555                 }
 556
 557                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 558                         wfProfileIn( 'main-try-filecache' );
 559                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 560                                 // Try low-level file cache hit
 561                                 $cache = new HTMLFileCache( $title, $action );
 562                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 563                                         // Check incoming headers to see if client has this cached
 564                                         $timestamp = $cache->cacheTimestamp();
 565                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 566                                                 $cache->loadFromFileCache( $this->context );
 567                                         }
 568                                         // Do any stats increment/watchlist stuff
 569                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 570                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 571                                         // Tell OutputPage that output is taken care of
 572                                         $this->context->getOutput()->disable();
 573                                         wfProfileOut( 'main-try-filecache' );
 574                                         wfProfileOut( __METHOD__ );
 575                                         return;
 576                                 }
 577                         }
 578                         wfProfileOut( 'main-try-filecache' );
 579                 }
 580
 581                 // Actually do the work of the request and build up any output
 582                 $this->performRequest();
 583
 584                 // Either all DB and deferred updates should happen or none.
 585                 // The later should not be cancelled due to client disconnect.
 586                 ignore_user_abort( true );
 587                 // Now commit any transactions, so that unreported errors after
 588                 // output() don't roll back the whole DB transaction
 589                 wfGetLBFactory()->commitMasterChanges();
 590
 591                 // Output everything!
 592                 $this->context->getOutput()->output();
 593
 594                 wfProfileOut( __METHOD__ );
 595         }
 596
 597         /**
 598          * Ends this task peacefully
 599          */
 600         public function restInPeace() {
 601                 // Do any deferred jobs
 602                 DeferredUpdates::doUpdates( 'commit' );
 603
 604                 // Log profiling data, e.g. in the database or UDP
 605                 wfLogProfilingData();
 606
 607                 // Commit and close up!
 608                 $factory = wfGetLBFactory();
 609                 $factory->commitMasterChanges();
 610                 $factory->shutdown();
 611
 612                 wfDebug( "Request ended normally\n" );
 613         }
 614
 615         /**
 616          * Potentially open a socket and sent an HTTP request back to the server
 617          * to run a specified number of jobs. This registers a callback to cleanup
 618          * the socket once it's done.
 619          */
 620         protected function triggerJobs() {
 621                 $jobRunRate = $this->config->get( 'JobRunRate' );
 622                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 623                         return;
 624                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 625                         return; // recursion guard
 626                 }
 627
 628                 $section = new ProfileSection( __METHOD__ );
 629
 630                 if ( $jobRunRate < 1 ) {
 631                         $max = mt_getrandmax();
 632                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 633                                 return; // the higher the job run rate, the less likely we return here
 634                         }
 635                         $n = 1;
 636                 } else {
 637                         $n = intval( $jobRunRate );
 638                 }
 639
 640                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 641                         // Fall back to running the job here while the user waits
 642                         $runner = new JobRunner();
 643                         $runner->run( array( 'maxJobs'  => $n ) );
 644                         return;
 645                 }
 646
 647                 try {
 648                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 649                                 return; // do not send request if there are probably no jobs
 650                         }
 651                 } catch ( JobQueueError $e ) {
 652                         MWExceptionHandler::logException( $e );
 653                         return; // do not make the site unavailable
 654                 }
 655
 656                 $query = array( 'title' => 'Special:RunJobs',
 657                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 658                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 659                         $query, $this->config->get( 'SecretKey' ) );
 660
 661                 $errno = $errstr = null;
 662                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 663                 wfSuppressWarnings();
 664                 $sock = fsockopen(
 665                         $info['host'],
 666                         isset( $info['port'] ) ? $info['port'] : 80,
 667                         $errno,
 668                         $errstr,
 669                         // If it takes more than 100ms to connect to ourselves there
 670                         // is a problem elsewhere.
 671                         0.1
 672                 );
 673                 wfRestoreWarnings();
 674                 if ( !$sock ) {
 675                         wfDebugLog( 'runJobs', "Failed to start cron API (socket error $errno): $errstr\n" );
 676                         // Fall back to running the job here while the user waits
 677                         $runner = new JobRunner();
 678                         $runner->run( array( 'maxJobs'  => $n ) );
 679                         return;
 680                 }
 681
 682                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 683                 $req = "POST $url HTTP/1.1\r\nHost: {$info['host']}\r\nConnection: Close\r\nContent-Length: 0\r\n\r\n";
 684
 685                 wfDebugLog( 'runJobs', "Running $n job(s) via '$url'\n" );
 686                 // Send a cron API request to be performed in the background.
 687                 // Give up if this takes too long to send (which should be rare).
 688                 stream_set_timeout( $sock, 1 );
 689                 $bytes = fwrite( $sock, $req );
 690                 if ( $bytes !== strlen( $req ) ) {
 691                         wfDebugLog( 'runJobs', "Failed to start cron API (socket write error)\n" );
 692                 } else {
 693                         // Do not wait for the response (the script should handle client aborts).
 694                         // Make sure that we don't close before that script reaches ignore_user_abort().
 695                         $status = fgets( $sock );
 696                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 697                                 wfDebugLog( 'runJobs', "Failed to start cron API: received '$status'\n" );
 698                         }
 699                 }
 700                 fclose( $sock );
 701         }
 702 }