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 use MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * The MediaWiki class is the helper class for the index.php entry point.
  27  */
  28 class MediaWiki {
  29         /**
  30          * @var IContextSource
  31          */
  32         private $context;
  33
  34         /**
  35          * @var Config
  36          */
  37         private $config;
  38
  39         /**
  40          * @param IContextSource|null $context
  41          */
  42         public function __construct( IContextSource $context = null ) {
  43                 if ( !$context ) {
  44                         $context = RequestContext::getMain();
  45                 }
  46
  47                 $this->context = $context;
  48                 $this->config = $context->getConfig();
  49         }
  50
  51         /**
  52          * Parse the request to get the Title object
  53          *
  54          * @throws MalformedTitleException If a title has been provided by the user, but is invalid.
  55          * @return Title Title object to be $wgTitle
  56          */
  57         private function parseTitle() {
  58                 global $wgContLang;
  59
  60                 $request = $this->context->getRequest();
  61                 $curid = $request->getInt( 'curid' );
  62                 $title = $request->getVal( 'title' );
  63                 $action = $request->getVal( 'action' );
  64
  65                 if ( $request->getCheck( 'search' ) ) {
  66                         // Compatibility with old search URLs which didn't use Special:Search
  67                         // Just check for presence here, so blank requests still
  68                         // show the search page when using ugly URLs (bug 8054).
  69                         $ret = SpecialPage::getTitleFor( 'Search' );
  70                 } elseif ( $curid ) {
  71                         // URLs like this are generated by RC, because rc_title isn't always accurate
  72                         $ret = Title::newFromID( $curid );
  73                 } else {
  74                         $ret = Title::newFromURL( $title );
  75                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  76                         // in wikitext links to tell Parser to make a direct file link
  77                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  78                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  79                         }
  80                         // Check variant links so that interwiki links don't have to worry
  81                         // about the possible different language variants
  82                         if ( count( $wgContLang->getVariants() ) > 1
  83                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  84                         ) {
  85                                 $wgContLang->findVariantLink( $title, $ret );
  86                         }
  87                 }
  88
  89                 // If title is not provided, always allow oldid and diff to set the title.
  90                 // If title is provided, allow oldid and diff to override the title, unless
  91                 // we are talking about a special page which might use these parameters for
  92                 // other purposes.
  93                 if ( $ret === null || !$ret->isSpecialPage() ) {
  94                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
  95                         $oldid = $request->getInt( 'oldid' );
  96                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
  97                         // Allow oldid to override a changed or missing title
  98                         if ( $oldid ) {
  99                                 $rev = Revision::newFromId( $oldid );
 100                                 $ret = $rev ? $rev->getTitle() : $ret;
 101                         }
 102                 }
 103
 104                 // Use the main page as default title if nothing else has been provided
 105                 if ( $ret === null
 106                         && strval( $title ) === ''
 107                         && !$request->getCheck( 'curid' )
 108                         && $action !== 'delete'
 109                 ) {
 110                         $ret = Title::newMainPage();
 111                 }
 112
 113                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 114                         // If we get here, we definitely don't have a valid title; throw an exception.
 115                         // Try to get detailed invalid title exception first, fall back to MalformedTitleException.
 116                         Title::newFromTextThrow( $title );
 117                         throw new MalformedTitleException( 'badtitletext', $title );
 118                 }
 119
 120                 return $ret;
 121         }
 122
 123         /**
 124          * Get the Title object that we'll be acting on, as specified in the WebRequest
 125          * @return Title
 126          */
 127         public function getTitle() {
 128                 if ( !$this->context->hasTitle() ) {
 129                         try {
 130                                 $this->context->setTitle( $this->parseTitle() );
 131                         } catch ( MalformedTitleException $ex ) {
 132                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 133                         }
 134                 }
 135                 return $this->context->getTitle();
 136         }
 137
 138         /**
 139          * Returns the name of the action that will be executed.
 140          *
 141          * @return string Action
 142          */
 143         public function getAction() {
 144                 static $action = null;
 145
 146                 if ( $action === null ) {
 147                         $action = Action::getActionName( $this->context );
 148                 }
 149
 150                 return $action;
 151         }
 152
 153         /**
 154          * Performs the request.
 155          * - bad titles
 156          * - read restriction
 157          * - local interwiki redirects
 158          * - redirect loop
 159          * - special pages
 160          * - normal pages
 161          *
 162          * @throws MWException|PermissionsError|BadTitleError|HttpError
 163          * @return void
 164          */
 165         private function performRequest() {
 166                 global $wgTitle;
 167
 168                 $request = $this->context->getRequest();
 169                 $requestTitle = $title = $this->context->getTitle();
 170                 $output = $this->context->getOutput();
 171                 $user = $this->context->getUser();
 172
 173                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 174                         $output->setPrintable();
 175                 }
 176
 177                 $unused = null; // To pass it by reference
 178                 Hooks::run( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 179
 180                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 181                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 182                         || $title->isSpecial( 'Badtitle' )
 183                 ) {
 184                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 185                         try {
 186                                 $this->parseTitle();
 187                         } catch ( MalformedTitleException $ex ) {
 188                                 throw new BadTitleError( $ex );
 189                         }
 190                         throw new BadTitleError();
 191                 }
 192
 193                 // Check user's permissions to read this page.
 194                 // We have to check here to catch special pages etc.
 195                 // We will check again in Article::view().
 196                 $permErrors = $title->isSpecial( 'RunJobs' )
 197                         ? array() // relies on HMAC key signature alone
 198                         : $title->getUserPermissionsErrors( 'read', $user );
 199                 if ( count( $permErrors ) ) {
 200                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 201                         // $this->context->title set to the input title would allow anonymous users to
 202                         // determine whether a page exists, potentially leaking private data. In fact, the
 203                         // curid and oldid request  parameters would allow page titles to be enumerated even
 204                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 205                         // permissions error is displayed.
 206                         //
 207                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 208                         // still use $wgTitle.
 209
 210                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 211                         $this->context->setTitle( $badTitle );
 212                         $wgTitle = $badTitle;
 213
 214                         throw new PermissionsError( 'read', $permErrors );
 215                 }
 216
 217                 // Interwiki redirects
 218                 if ( $title->isExternal() ) {
 219                         $rdfrom = $request->getVal( 'rdfrom' );
 220                         if ( $rdfrom ) {
 221                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 222                         } else {
 223                                 $query = $request->getValues();
 224                                 unset( $query['title'] );
 225                                 $url = $title->getFullURL( $query );
 226                         }
 227                         // Check for a redirect loop
 228                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 229                                 && $title->isLocal()
 230                         ) {
 231                                 // 301 so google et al report the target as the actual url.
 232                                 $output->redirect( $url, 301 );
 233                         } else {
 234                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 235                                 try {
 236                                         $this->parseTitle();
 237                                 } catch ( MalformedTitleException $ex ) {
 238                                         throw new BadTitleError( $ex );
 239                                 }
 240                                 throw new BadTitleError();
 241                         }
 242                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 243                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 244                         && ( $request->getVal( 'title' ) === null
 245                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 246                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 247                         && Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 248                 ) {
 249                         if ( $title->isSpecialPage() ) {
 250                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 251                                 if ( $name ) {
 252                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 253                                 }
 254                         }
 255                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 256                         // Redirect to canonical url, make it a 301 to allow caching
 257                         if ( $targetUrl == $request->getFullRequestURL() ) {
 258                                 $message = "Redirect loop detected!\n\n" .
 259                                         "This means the wiki got confused about what page was " .
 260                                         "requested; this sometimes happens when moving a wiki " .
 261                                         "to a new server or changing the server configuration.\n\n";
 262
 263                                 if ( $this->config->get( 'UsePathInfo' ) ) {
 264                                         $message .= "The wiki is trying to interpret the page " .
 265                                                 "title from the URL path portion (PATH_INFO), which " .
 266                                                 "sometimes fails depending on the web server. Try " .
 267                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 268                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 269                                                 "is correct.";
 270                                 } else {
 271                                         $message .= "Your web server was detected as possibly not " .
 272                                                 "supporting URL path components (PATH_INFO) correctly; " .
 273                                                 "check your LocalSettings.php for a customized " .
 274                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 275                                                 "to true.";
 276                                 }
 277                                 throw new HttpError( 500, $message );
 278                         } else {
 279                                 $output->setSquidMaxage( 1200 );
 280                                 $output->redirect( $targetUrl, '301' );
 281                         }
 282                 // Special pages
 283                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 284                         // Actions that need to be made when we have a special pages
 285                         SpecialPageFactory::executePath( $title, $this->context );
 286                 } else {
 287                         // ...otherwise treat it as an article view. The article
 288                         // may be a redirect to another article or URL.
 289                         $article = $this->initializeArticle();
 290                         if ( is_object( $article ) ) {
 291                                 $this->performAction( $article, $requestTitle );
 292                         } elseif ( is_string( $article ) ) {
 293                                 $output->redirect( $article );
 294                         } else {
 295                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 296                                         . " returned neither an object nor a URL" );
 297                         }
 298                 }
 299         }
 300
 301         /**
 302          * Initialize the main Article object for "standard" actions (view, etc)
 303          * Create an Article object for the page, following redirects if needed.
 304          *
 305          * @return mixed An Article, or a string to redirect to another URL
 306          */
 307         private function initializeArticle() {
 308
 309                 $title = $this->context->getTitle();
 310                 if ( $this->context->canUseWikiPage() ) {
 311                         // Try to use request context wiki page, as there
 312                         // is already data from db saved in per process
 313                         // cache there from this->getAction() call.
 314                         $page = $this->context->getWikiPage();
 315                         $article = Article::newFromWikiPage( $page, $this->context );
 316                 } else {
 317                         // This case should not happen, but just in case.
 318                         $article = Article::newFromTitle( $title, $this->context );
 319                         $this->context->setWikiPage( $article->getPage() );
 320                 }
 321
 322                 // NS_MEDIAWIKI has no redirects.
 323                 // It is also used for CSS/JS, so performance matters here...
 324                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 325                         return $article;
 326                 }
 327
 328                 $request = $this->context->getRequest();
 329
 330                 // Namespace might change when using redirects
 331                 // Check for redirects ...
 332                 $action = $request->getVal( 'action', 'view' );
 333                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 334                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 335                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 336                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 337                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 338                         // ... and the article is not a non-redirect image page with associated file
 339                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 340                 ) {
 341                         // Give extensions a change to ignore/handle redirects as needed
 342                         $ignoreRedirect = $target = false;
 343
 344                         Hooks::run( 'InitializeArticleMaybeRedirect',
 345                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 346
 347                         // Follow redirects only for... redirects.
 348                         // If $target is set, then a hook wanted to redirect.
 349                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 350                                 // Is the target already set by an extension?
 351                                 $target = $target ? $target : $article->followRedirect();
 352                                 if ( is_string( $target ) ) {
 353                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 354                                                 // we'll need to redirect
 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                 return $article;
 376         }
 377
 378         /**
 379          * Perform one of the "standard" actions
 380          *
 381          * @param Page $page
 382          * @param Title $requestTitle The original title, before any redirects were applied
 383          */
 384         private function performAction( Page $page, Title $requestTitle ) {
 385
 386                 $request = $this->context->getRequest();
 387                 $output = $this->context->getOutput();
 388                 $title = $this->context->getTitle();
 389                 $user = $this->context->getUser();
 390
 391                 if ( !Hooks::run( 'MediaWikiPerformAction',
 392                                 array( $output, $page, $title, $user, $request, $this ) )
 393                 ) {
 394                         return;
 395                 }
 396
 397                 $act = $this->getAction();
 398
 399                 $action = Action::factory( $act, $page, $this->context );
 400
 401                 if ( $action instanceof Action ) {
 402                         # Let Squid cache things if we can purge them.
 403                         if ( $this->config->get( 'UseSquid' ) &&
 404                                 in_array(
 405                                         // Use PROTO_INTERNAL because that's what getSquidURLs() uses
 406                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 407                                         $requestTitle->getSquidURLs()
 408                                 )
 409                         ) {
 410                                 $output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
 411                         }
 412
 413                         $action->show();
 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         }
 423
 424         /**
 425          * Run the current MediaWiki instance; index.php just calls this
 426          */
 427         public function run() {
 428                 try {
 429                         $this->checkMaxLag();
 430                         try {
 431                                 $this->main();
 432                         } catch ( ErrorPageError $e ) {
 433                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 434                                 // they are not internal application faults. As with normal requests, this
 435                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 436                                 wfGetLBFactory()->commitMasterChanges();
 437                                 $e->report(); // display the GUI error
 438                         }
 439                 } catch ( Exception $e ) {
 440                         MWExceptionHandler::handleException( $e );
 441                 }
 442
 443                 if ( function_exists( 'register_postsend_function' ) ) {
 444                         // https://github.com/facebook/hhvm/issues/1230
 445                         register_postsend_function( array( $this, 'postSendUpdates' ) );
 446                 } elseif ( function_exists( 'fastcgi_finish_request' ) ) {
 447                         fastcgi_finish_request();
 448                         $this->postSendUpdates();
 449                 } else {
 450                         $this->postSendUpdates();
 451                 }
 452         }
 453
 454         /**
 455          * This function does work that can be done *after* the
 456          * user gets the HTTP response so they don't block on it
 457          *
 458          * @since 1.26
 459          */
 460         public function postSendUpdates() {
 461                 try {
 462                         JobQueueGroup::pushLazyJobs();
 463                         $this->triggerJobs();
 464                         $this->restInPeace();
 465                 } catch ( Exception $e ) {
 466                         MWExceptionHandler::handleException( $e );
 467                 }
 468         }
 469
 470         /**
 471          * Checks if the request should abort due to a lagged server,
 472          * for given maxlag parameter.
 473          * @return bool
 474          */
 475         private function checkMaxLag() {
 476                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 477                 if ( !is_null( $maxLag ) ) {
 478                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 479                         if ( $lag > $maxLag ) {
 480                                 $resp = $this->context->getRequest()->response();
 481                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 482                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 483                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 484                                 $resp->header( 'Content-Type: text/plain' );
 485                                 if ( $this->config->get( 'ShowHostnames' ) ) {
 486                                         echo "Waiting for $host: $lag seconds lagged\n";
 487                                 } else {
 488                                         echo "Waiting for a database server: $lag seconds lagged\n";
 489                                 }
 490
 491                                 exit;
 492                         }
 493                 }
 494                 return true;
 495         }
 496
 497         private function main() {
 498                 global $wgTitle, $wgTrxProfilerLimits;
 499
 500                 $request = $this->context->getRequest();
 501
 502                 // Send Ajax requests to the Ajax dispatcher.
 503                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 504                         // Set a dummy title, because $wgTitle == null might break things
 505                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 506                                 . __METHOD__
 507                         );
 508                         $this->context->setTitle( $title );
 509                         $wgTitle = $title;
 510
 511                         $dispatcher = new AjaxDispatcher( $this->config );
 512                         $dispatcher->performAction( $this->context->getUser() );
 513                         return;
 514                 }
 515
 516                 // Get title from request parameters,
 517                 // is set on the fly by parseTitle the first time.
 518                 $title = $this->getTitle();
 519                 $action = $this->getAction();
 520                 $wgTitle = $title;
 521
 522                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 523                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 524
 525                 // Aside from rollback, master queries should not happen on GET requests.
 526                 // Periodic or "in passing" updates on GET should use the job queue.
 527                 if ( !$request->wasPosted()
 528                         && in_array( $action, array( 'view', 'edit', 'history' ) )
 529                 ) {
 530                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['GET'], __METHOD__ );
 531                 } else {
 532                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['POST'], __METHOD__ );
 533                 }
 534
 535                 // If the user has forceHTTPS set to true, or if the user
 536                 // is in a group requiring HTTPS, or if they have the HTTPS
 537                 // preference set, redirect them to HTTPS.
 538                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 539                 // isLoggedIn() will do all sorts of weird stuff.
 540                 if (
 541                         $request->getProtocol() == 'http' &&
 542                         (
 543                                 $request->getCookie( 'forceHTTPS', '' ) ||
 544                                 // check for prefixed version for currently logged in users
 545                                 $request->getCookie( 'forceHTTPS' ) ||
 546                                 // Avoid checking the user and groups unless it's enabled.
 547                                 (
 548                                         $this->context->getUser()->isLoggedIn()
 549                                         && $this->context->getUser()->requiresHTTPS()
 550                                 )
 551                         )
 552                 ) {
 553                         $oldUrl = $request->getFullRequestURL();
 554                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 555
 556                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 557                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 558
 559                                 if ( $request->wasPosted() ) {
 560                                         // This is weird and we'd hope it almost never happens. This
 561                                         // means that a POST came in via HTTP and policy requires us
 562                                         // redirecting to HTTPS. It's likely such a request is going
 563                                         // to fail due to post data being lost, but let's try anyway
 564                                         // and just log the instance.
 565                                         //
 566                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 567                                         // to see how clients (automated & browser) behave when we do
 568                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 569                                 }
 570                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 571                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 572                                 $this->context->setTitle( $title );
 573                                 $output = $this->context->getOutput();
 574                                 // Since we only do this redir to change proto, always send a vary header
 575                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 576                                 $output->redirect( $redirUrl );
 577                                 $output->output();
 578                                 return;
 579                         }
 580                 }
 581
 582                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 583                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 584                                 // Try low-level file cache hit
 585                                 $cache = new HTMLFileCache( $title, $action );
 586                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 587                                         // Check incoming headers to see if client has this cached
 588                                         $timestamp = $cache->cacheTimestamp();
 589                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 590                                                 $cache->loadFromFileCache( $this->context );
 591                                         }
 592                                         // Do any stats increment/watchlist stuff
 593                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 594                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 595                                         // Tell OutputPage that output is taken care of
 596                                         $this->context->getOutput()->disable();
 597                                         return;
 598                                 }
 599                         }
 600                 }
 601
 602                 // Actually do the work of the request and build up any output
 603                 $this->performRequest();
 604
 605                 // Either all DB and deferred updates should happen or none.
 606                 // The later should not be cancelled due to client disconnect.
 607                 ignore_user_abort( true );
 608                 // Now commit any transactions, so that unreported errors after
 609                 // output() don't roll back the whole DB transaction
 610                 wfGetLBFactory()->commitMasterChanges();
 611
 612                 // Output everything!
 613                 $this->context->getOutput()->output();
 614
 615         }
 616
 617         /**
 618          * Ends this task peacefully
 619          */
 620         public function restInPeace() {
 621                 // Ignore things like master queries/connections on GET requests
 622                 // as long as they are in deferred updates (which catch errors).
 623                 Profiler::instance()->getTransactionProfiler()->resetExpectations();
 624
 625                 // Do any deferred jobs
 626                 DeferredUpdates::doUpdates( 'commit' );
 627
 628                 // Make sure any lazy jobs are pushed
 629                 JobQueueGroup::pushLazyJobs();
 630
 631                 // Log profiling data, e.g. in the database or UDP
 632                 wfLogProfilingData();
 633
 634                 // Commit and close up!
 635                 $factory = wfGetLBFactory();
 636                 $factory->commitMasterChanges();
 637                 $factory->shutdown();
 638
 639                 wfDebug( "Request ended normally\n" );
 640         }
 641
 642         /**
 643          * Potentially open a socket and sent an HTTP request back to the server
 644          * to run a specified number of jobs. This registers a callback to cleanup
 645          * the socket once it's done.
 646          */
 647         protected function triggerJobs() {
 648                 $jobRunRate = $this->config->get( 'JobRunRate' );
 649                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 650                         return;
 651                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 652                         return; // recursion guard
 653                 }
 654
 655                 if ( $jobRunRate < 1 ) {
 656                         $max = mt_getrandmax();
 657                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 658                                 return; // the higher the job run rate, the less likely we return here
 659                         }
 660                         $n = 1;
 661                 } else {
 662                         $n = intval( $jobRunRate );
 663                 }
 664
 665                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 666
 667                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 668                         // Fall back to running the job here while the user waits
 669                         $runner = new JobRunner( $runJobsLogger );
 670                         $runner->run( array( 'maxJobs'  => $n ) );
 671                         return;
 672                 }
 673
 674                 try {
 675                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 676                                 return; // do not send request if there are probably no jobs
 677                         }
 678                 } catch ( JobQueueError $e ) {
 679                         MWExceptionHandler::logException( $e );
 680                         return; // do not make the site unavailable
 681                 }
 682
 683                 $query = array( 'title' => 'Special:RunJobs',
 684                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 685                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 686                         $query, $this->config->get( 'SecretKey' ) );
 687
 688                 $errno = $errstr = null;
 689                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 690                 wfSuppressWarnings();
 691                 $sock = fsockopen(
 692                         $info['host'],
 693                         isset( $info['port'] ) ? $info['port'] : 80,
 694                         $errno,
 695                         $errstr,
 696                         // If it takes more than 100ms to connect to ourselves there
 697                         // is a problem elsewhere.
 698                         0.1
 699                 );
 700                 wfRestoreWarnings();
 701                 if ( !$sock ) {
 702                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 703                         // Fall back to running the job here while the user waits
 704                         $runner = new JobRunner( $runJobsLogger );
 705                         $runner->run( array( 'maxJobs'  => $n ) );
 706                         return;
 707                 }
 708
 709                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 710                 $req = (
 711                         "POST $url HTTP/1.1\r\n" .
 712                         "Host: {$info['host']}\r\n" .
 713                         "Connection: Close\r\n" .
 714                         "Content-Length: 0\r\n\r\n"
 715                 );
 716
 717                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 718                 // Send a cron API request to be performed in the background.
 719                 // Give up if this takes too long to send (which should be rare).
 720                 stream_set_timeout( $sock, 1 );
 721                 $bytes = fwrite( $sock, $req );
 722                 if ( $bytes !== strlen( $req ) ) {
 723                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 724                 } else {
 725                         // Do not wait for the response (the script should handle client aborts).
 726                         // Make sure that we don't close before that script reaches ignore_user_abort().
 727                         $status = fgets( $sock );
 728                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 729                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 730                         }
 731                 }
 732                 fclose( $sock );
 733         }
 734 }