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  * @internal documentation reviewed 15 Mar 2010
  27  */
  28 class MediaWiki {
  29         /**
  30          * @todo Fold $output, etc, into this
  31          * @var IContextSource
  32          */
  33         private $context;
  34
  35         /**
  36          * @var Config
  37          */
  38         private $config;
  39
  40         /**
  41          * @param null|WebRequest $x
  42          * @return WebRequest
  43          */
  44         public function request( WebRequest $x = null ) {
  45                 $old = $this->context->getRequest();
  46                 if ( $x ) {
  47                         $this->context->setRequest( $x );
  48                 }
  49                 return $old;
  50         }
  51
  52         /**
  53          * @param null|OutputPage $x
  54          * @return OutputPage
  55          */
  56         public function output( OutputPage $x = null ) {
  57                 $old = $this->context->getOutput();
  58                 if ( $x ) {
  59                         $this->context->setOutput( $x );
  60                 }
  61                 return $old;
  62         }
  63
  64         /**
  65          * @param IContextSource|null $context
  66          */
  67         public function __construct( IContextSource $context = null ) {
  68                 if ( !$context ) {
  69                         $context = RequestContext::getMain();
  70                 }
  71
  72                 $this->context = $context;
  73                 $this->config = $context->getConfig();
  74         }
  75
  76         /**
  77          * Parse the request to get the Title object
  78          *
  79          * @return Title Title object to be $wgTitle
  80          */
  81         private function parseTitle() {
  82                 global $wgContLang;
  83
  84                 $request = $this->context->getRequest();
  85                 $curid = $request->getInt( 'curid' );
  86                 $title = $request->getVal( 'title' );
  87                 $action = $request->getVal( 'action', 'view' );
  88
  89                 if ( $request->getCheck( 'search' ) ) {
  90                         // Compatibility with old search URLs which didn't use Special:Search
  91                         // Just check for presence here, so blank requests still
  92                         // show the search page when using ugly URLs (bug 8054).
  93                         $ret = SpecialPage::getTitleFor( 'Search' );
  94                 } elseif ( $curid ) {
  95                         // URLs like this are generated by RC, because rc_title isn't always accurate
  96                         $ret = Title::newFromID( $curid );
  97                 } else {
  98                         $ret = Title::newFromURL( $title );
  99                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
 100                         // in wikitext links to tell Parser to make a direct file link
 101                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
 102                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
 103                         }
 104                         // Check variant links so that interwiki links don't have to worry
 105                         // about the possible different language variants
 106                         if ( count( $wgContLang->getVariants() ) > 1
 107                                 && !is_null( $ret ) && $ret->getArticleID() == 0
 108                         ) {
 109                                 $wgContLang->findVariantLink( $title, $ret );
 110                         }
 111                 }
 112
 113                 // If title is not provided, always allow oldid and diff to set the title.
 114                 // If title is provided, allow oldid and diff to override the title, unless
 115                 // we are talking about a special page which might use these parameters for
 116                 // other purposes.
 117                 if ( $ret === null || !$ret->isSpecialPage() ) {
 118                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 119                         $oldid = $request->getInt( 'oldid' );
 120                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 121                         // Allow oldid to override a changed or missing title
 122                         if ( $oldid ) {
 123                                 $rev = Revision::newFromId( $oldid );
 124                                 $ret = $rev ? $rev->getTitle() : $ret;
 125                         }
 126                 }
 127
 128                 // Use the main page as default title if nothing else has been provided
 129                 if ( $ret === null
 130                         && strval( $title ) === ''
 131                         && !$request->getCheck( 'curid' )
 132                         && $action !== 'delete'
 133                 ) {
 134                         $ret = Title::newMainPage();
 135                 }
 136
 137                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 138                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 139                 }
 140
 141                 return $ret;
 142         }
 143
 144         /**
 145          * Get the Title object that we'll be acting on, as specified in the WebRequest
 146          * @return Title
 147          */
 148         public function getTitle() {
 149                 if ( $this->context->getTitle() === null ) {
 150                         $this->context->setTitle( $this->parseTitle() );
 151                 }
 152                 return $this->context->getTitle();
 153         }
 154
 155         /**
 156          * Returns the name of the action that will be executed.
 157          *
 158          * @return string Action
 159          */
 160         public function getAction() {
 161                 static $action = null;
 162
 163                 if ( $action === null ) {
 164                         $action = Action::getActionName( $this->context );
 165                 }
 166
 167                 return $action;
 168         }
 169
 170         /**
 171          * Performs the request.
 172          * - bad titles
 173          * - read restriction
 174          * - local interwiki redirects
 175          * - redirect loop
 176          * - special pages
 177          * - normal pages
 178          *
 179          * @throws MWException|PermissionsError|BadTitleError|HttpError
 180          * @return void
 181          */
 182         private function performRequest() {
 183                 global $wgTitle;
 184
 185                 wfProfileIn( __METHOD__ );
 186
 187                 $request = $this->context->getRequest();
 188                 $requestTitle = $title = $this->context->getTitle();
 189                 $output = $this->context->getOutput();
 190                 $user = $this->context->getUser();
 191
 192                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 193                         $output->setPrintable();
 194                 }
 195
 196                 $unused = null; // To pass it by reference
 197                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 198
 199                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 200                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 201                         || $title->isSpecial( 'Badtitle' )
 202                 ) {
 203                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 204                         wfProfileOut( __METHOD__ );
 205                         throw new BadTitleError();
 206                 }
 207
 208                 // Check user's permissions to read this page.
 209                 // We have to check here to catch special pages etc.
 210                 // We will check again in Article::view().
 211                 $permErrors = $title->isSpecial( 'RunJobs' )
 212                         ? array() // relies on HMAC key signature alone
 213                         : $title->getUserPermissionsErrors( 'read', $user );
 214                 if ( count( $permErrors ) ) {
 215                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 216                         // $this->context->title set to the input title would allow anonymous users to
 217                         // determine whether a page exists, potentially leaking private data. In fact, the
 218                         // curid and oldid request  parameters would allow page titles to be enumerated even
 219                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 220                         // permissions error is displayed.
 221                         //
 222                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 223                         // still use $wgTitle.
 224
 225                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 226                         $this->context->setTitle( $badTitle );
 227                         $wgTitle = $badTitle;
 228
 229                         wfProfileOut( __METHOD__ );
 230                         throw new PermissionsError( 'read', $permErrors );
 231                 }
 232
 233                 $pageView = false; // was an article or special page viewed?
 234
 235                 // Interwiki redirects
 236                 if ( $title->isExternal() ) {
 237                         $rdfrom = $request->getVal( 'rdfrom' );
 238                         if ( $rdfrom ) {
 239                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 240                         } else {
 241                                 $query = $request->getValues();
 242                                 unset( $query['title'] );
 243                                 $url = $title->getFullURL( $query );
 244                         }
 245                         // Check for a redirect loop
 246                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 247                                 && $title->isLocal()
 248                         ) {
 249                                 // 301 so google et al report the target as the actual url.
 250                                 $output->redirect( $url, 301 );
 251                         } else {
 252                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 253                                 wfProfileOut( __METHOD__ );
 254                                 throw new BadTitleError();
 255                         }
 256                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 257                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 258                         && ( $request->getVal( 'title' ) === null
 259                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 260                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 261                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 262                 ) {
 263                         if ( $title->isSpecialPage() ) {
 264                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 265                                 if ( $name ) {
 266                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 267                                 }
 268                         }
 269                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 270                         // Redirect to canonical url, make it a 301 to allow caching
 271                         if ( $targetUrl == $request->getFullRequestURL() ) {
 272                                 $message = "Redirect loop detected!\n\n" .
 273                                         "This means the wiki got confused about what page was " .
 274                                         "requested; this sometimes happens when moving a wiki " .
 275                                         "to a new server or changing the server configuration.\n\n";
 276
 277                                 if ( $this->config->get( 'UsePathInfo' ) ) {
 278                                         $message .= "The wiki is trying to interpret the page " .
 279                                                 "title from the URL path portion (PATH_INFO), which " .
 280                                                 "sometimes fails depending on the web server. Try " .
 281                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 282                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 283                                                 "is correct.";
 284                                 } else {
 285                                         $message .= "Your web server was detected as possibly not " .
 286                                                 "supporting URL path components (PATH_INFO) correctly; " .
 287                                                 "check your LocalSettings.php for a customized " .
 288                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 289                                                 "to true.";
 290                                 }
 291                                 throw new HttpError( 500, $message );
 292                         } else {
 293                                 $output->setSquidMaxage( 1200 );
 294                                 $output->redirect( $targetUrl, '301' );
 295                         }
 296                 // Special pages
 297                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 298                         $pageView = true;
 299                         // Actions that need to be made when we have a special pages
 300                         SpecialPageFactory::executePath( $title, $this->context );
 301                 } else {
 302                         // ...otherwise treat it as an article view. The article
 303                         // may be a redirect to another article or URL.
 304                         $article = $this->initializeArticle();
 305                         if ( is_object( $article ) ) {
 306                                 $pageView = true;
 307                                 $this->performAction( $article, $requestTitle );
 308                         } elseif ( is_string( $article ) ) {
 309                                 $output->redirect( $article );
 310                         } else {
 311                                 wfProfileOut( __METHOD__ );
 312                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 313                                         . " returned neither an object nor a URL" );
 314                         }
 315                 }
 316
 317                 if ( $pageView ) {
 318                         // Promote user to any groups they meet the criteria for
 319                         $user->addAutopromoteOnceGroups( 'onView' );
 320                 }
 321
 322                 wfProfileOut( __METHOD__ );
 323         }
 324
 325         /**
 326          * Initialize the main Article object for "standard" actions (view, etc)
 327          * Create an Article object for the page, following redirects if needed.
 328          *
 329          * @return mixed An Article, or a string to redirect to another URL
 330          */
 331         private function initializeArticle() {
 332                 wfProfileIn( __METHOD__ );
 333
 334                 $title = $this->context->getTitle();
 335                 if ( $this->context->canUseWikiPage() ) {
 336                         // Try to use request context wiki page, as there
 337                         // is already data from db saved in per process
 338                         // cache there from this->getAction() call.
 339                         $page = $this->context->getWikiPage();
 340                         $article = Article::newFromWikiPage( $page, $this->context );
 341                 } else {
 342                         // This case should not happen, but just in case.
 343                         $article = Article::newFromTitle( $title, $this->context );
 344                         $this->context->setWikiPage( $article->getPage() );
 345                 }
 346
 347                 // NS_MEDIAWIKI has no redirects.
 348                 // It is also used for CSS/JS, so performance matters here...
 349                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 350                         wfProfileOut( __METHOD__ );
 351                         return $article;
 352                 }
 353
 354                 $request = $this->context->getRequest();
 355
 356                 // Namespace might change when using redirects
 357                 // Check for redirects ...
 358                 $action = $request->getVal( 'action', 'view' );
 359                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 360                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 361                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 362                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 363                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 364                         // ... and the article is not a non-redirect image page with associated file
 365                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 366                 ) {
 367                         // Give extensions a change to ignore/handle redirects as needed
 368                         $ignoreRedirect = $target = false;
 369
 370                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 371                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 372
 373                         // Follow redirects only for... redirects.
 374                         // If $target is set, then a hook wanted to redirect.
 375                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 376                                 // Is the target already set by an extension?
 377                                 $target = $target ? $target : $article->followRedirect();
 378                                 if ( is_string( $target ) ) {
 379                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 380                                                 // we'll need to redirect
 381                                                 wfProfileOut( __METHOD__ );
 382                                                 return $target;
 383                                         }
 384                                 }
 385                                 if ( is_object( $target ) ) {
 386                                         // Rewrite environment to redirected article
 387                                         $rarticle = Article::newFromTitle( $target, $this->context );
 388                                         $rarticle->loadPageData();
 389                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 390                                                 $rarticle->setRedirectedFrom( $title );
 391                                                 $article = $rarticle;
 392                                                 $this->context->setTitle( $target );
 393                                                 $this->context->setWikiPage( $article->getPage() );
 394                                         }
 395                                 }
 396                         } else {
 397                                 $this->context->setTitle( $article->getTitle() );
 398                                 $this->context->setWikiPage( $article->getPage() );
 399                         }
 400                 }
 401
 402                 wfProfileOut( __METHOD__ );
 403                 return $article;
 404         }
 405
 406         /**
 407          * Perform one of the "standard" actions
 408          *
 409          * @param Page $page
 410          * @param Title $requestTitle The original title, before any redirects were applied
 411          */
 412         private function performAction( Page $page, Title $requestTitle ) {
 413                 wfProfileIn( __METHOD__ );
 414
 415                 $request = $this->context->getRequest();
 416                 $output = $this->context->getOutput();
 417                 $title = $this->context->getTitle();
 418                 $user = $this->context->getUser();
 419
 420                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 421                                 array( $output, $page, $title, $user, $request, $this ) )
 422                 ) {
 423                         wfProfileOut( __METHOD__ );
 424                         return;
 425                 }
 426
 427                 $act = $this->getAction();
 428
 429                 $action = Action::factory( $act, $page, $this->context );
 430
 431                 if ( $action instanceof Action ) {
 432                         # Let Squid cache things if we can purge them.
 433                         if ( $this->config->get( 'UseSquid' ) &&
 434                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 435                         ) {
 436                                 $output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
 437                         }
 438
 439                         $action->show();
 440                         wfProfileOut( __METHOD__ );
 441                         return;
 442                 }
 443
 444                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 445                         $output->setStatusCode( 404 );
 446                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 447                 }
 448
 449                 wfProfileOut( __METHOD__ );
 450         }
 451
 452         /**
 453          * Run the current MediaWiki instance
 454          * index.php just calls this
 455          */
 456         public function run() {
 457                 try {
 458                         $this->checkMaxLag();
 459                         try {
 460                                 $this->main();
 461                         } catch ( ErrorPageError $e ) {
 462                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 463                                 // they are not internal application faults. As with normal requests, this
 464                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 465                                 wfGetLBFactory()->commitMasterChanges();
 466                                 $e->report(); // display the GUI error
 467                         }
 468                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 469                                 fastcgi_finish_request();
 470                         }
 471                         $this->triggerJobs();
 472                         $this->restInPeace();
 473                 } catch ( Exception $e ) {
 474                         MWExceptionHandler::handle( $e );
 475                 }
 476         }
 477
 478         /**
 479          * Checks if the request should abort due to a lagged server,
 480          * for given maxlag parameter.
 481          * @return bool
 482          */
 483         private function checkMaxLag() {
 484                 wfProfileIn( __METHOD__ );
 485                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 486                 if ( !is_null( $maxLag ) ) {
 487                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 488                         if ( $lag > $maxLag ) {
 489                                 $resp = $this->context->getRequest()->response();
 490                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 491                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 492                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 493                                 $resp->header( 'Content-Type: text/plain' );
 494                                 if ( $this->config->get( 'ShowHostnames' ) ) {
 495                                         echo "Waiting for $host: $lag seconds lagged\n";
 496                                 } else {
 497                                         echo "Waiting for a database server: $lag seconds lagged\n";
 498                                 }
 499
 500                                 wfProfileOut( __METHOD__ );
 501
 502                                 exit;
 503                         }
 504                 }
 505                 wfProfileOut( __METHOD__ );
 506                 return true;
 507         }
 508
 509         private function main() {
 510                 global $wgTitle;
 511
 512                 wfProfileIn( __METHOD__ );
 513
 514                 $request = $this->context->getRequest();
 515
 516                 // Send Ajax requests to the Ajax dispatcher.
 517                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 518
 519                         // Set a dummy title, because $wgTitle == null might break things
 520                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 521                         $this->context->setTitle( $title );
 522                         $wgTitle = $title;
 523
 524                         $dispatcher = new AjaxDispatcher();
 525                         $dispatcher->performAction();
 526                         wfProfileOut( __METHOD__ );
 527                         return;
 528                 }
 529
 530                 // Get title from request parameters,
 531                 // is set on the fly by parseTitle the first time.
 532                 $title = $this->getTitle();
 533                 $action = $this->getAction();
 534                 $wgTitle = $title;
 535
 536                 // If the user has forceHTTPS set to true, or if the user
 537                 // is in a group requiring HTTPS, or if they have the HTTPS
 538                 // preference set, redirect them to HTTPS.
 539                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 540                 // isLoggedIn() will do all sorts of weird stuff.
 541                 if (
 542                         $request->getProtocol() == 'http' &&
 543                         (
 544                                 $request->getCookie( 'forceHTTPS', '' ) ||
 545                                 // check for prefixed version for currently logged in users
 546                                 $request->getCookie( 'forceHTTPS' ) ||
 547                                 // Avoid checking the user and groups unless it's enabled.
 548                                 (
 549                                         $this->context->getUser()->isLoggedIn()
 550                                         && $this->context->getUser()->requiresHTTPS()
 551                                 )
 552                         )
 553                 ) {
 554                         $oldUrl = $request->getFullRequestURL();
 555                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 556
 557                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 558                         if ( wfRunHooks( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 559
 560                                 if ( $request->wasPosted() ) {
 561                                         // This is weird and we'd hope it almost never happens. This
 562                                         // means that a POST came in via HTTP and policy requires us
 563                                         // redirecting to HTTPS. It's likely such a request is going
 564                                         // to fail due to post data being lost, but let's try anyway
 565                                         // and just log the instance.
 566                                         //
 567                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 568                                         // to see how clients (automated & browser) behave when we do
 569                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 570                                 }
 571                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 572                                 $title = Title::newFromText( NS_MAIN, 'REDIR' );
 573                                 $this->context->setTitle( $title );
 574                                 $output = $this->context->getOutput();
 575                                 // Since we only do this redir to change proto, always send a vary header
 576                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 577                                 $output->redirect( $redirUrl );
 578                                 $output->output();
 579                                 wfProfileOut( __METHOD__ );
 580                                 return;
 581                         }
 582                 }
 583
 584                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 585                         wfProfileIn( 'main-try-filecache' );
 586                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 587                                 // Try low-level file cache hit
 588                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 589                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 590                                         // Check incoming headers to see if client has this cached
 591                                         $timestamp = $cache->cacheTimestamp();
 592                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 593                                                 $cache->loadFromFileCache( $this->context );
 594                                         }
 595                                         // Do any stats increment/watchlist stuff
 596                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 597                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 598                                         // Tell OutputPage that output is taken care of
 599                                         $this->context->getOutput()->disable();
 600                                         wfProfileOut( 'main-try-filecache' );
 601                                         wfProfileOut( __METHOD__ );
 602                                         return;
 603                                 }
 604                         }
 605                         wfProfileOut( 'main-try-filecache' );
 606                 }
 607
 608                 // Actually do the work of the request and build up any output
 609                 $this->performRequest();
 610
 611                 // Either all DB and deferred updates should happen or none.
 612                 // The later should not be cancelled due to client disconnect.
 613                 ignore_user_abort( true );
 614                 // Now commit any transactions, so that unreported errors after
 615                 // output() don't roll back the whole DB transaction
 616                 wfGetLBFactory()->commitMasterChanges();
 617
 618                 // Output everything!
 619                 $this->context->getOutput()->output();
 620
 621                 wfProfileOut( __METHOD__ );
 622         }
 623
 624         /**
 625          * Ends this task peacefully
 626          */
 627         public function restInPeace() {
 628                 // Do any deferred jobs
 629                 DeferredUpdates::doUpdates( 'commit' );
 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                 $section = new ProfileSection( __METHOD__ );
 656
 657                 if ( $jobRunRate < 1 ) {
 658                         $max = mt_getrandmax();
 659                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 660                                 return; // the higher the job run rate, the less likely we return here
 661                         }
 662                         $n = 1;
 663                 } else {
 664                         $n = intval( $jobRunRate );
 665                 }
 666
 667                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 668                         // Fall back to running the job here while the user waits
 669                         $runner = new JobRunner();
 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( $query );
 686
 687                 $errno = $errstr = null;
 688                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 689                 wfSuppressWarnings();
 690                 $sock = fsockopen(
 691                         $info['host'],
 692                         isset( $info['port'] ) ? $info['port'] : 80,
 693                         $errno,
 694                         $errstr,
 695                         // If it takes more than 100ms to connect to ourselves there
 696                         // is a problem elsewhere.
 697                         0.1
 698                 );
 699                 wfRestoreWarnings();
 700                 if ( !$sock ) {
 701                         wfDebugLog( 'runJobs', "Failed to start cron API (socket error $errno): $errstr\n" );
 702                         // Fall back to running the job here while the user waits
 703                         $runner = new JobRunner();
 704                         $runner->run( array( 'maxJobs'  => $n ) );
 705                         return;
 706                 }
 707
 708                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 709                 $req = "POST $url HTTP/1.1\r\nHost: {$info['host']}\r\nConnection: Close\r\n\r\n";
 710
 711                 wfDebugLog( 'runJobs', "Running $n job(s) via '$url'\n" );
 712                 // Send a cron API request to be performed in the background.
 713                 // Give up if this takes too long to send (which should be rare).
 714                 stream_set_timeout( $sock, 1 );
 715                 $bytes = fwrite( $sock, $req );
 716                 if ( $bytes !== strlen( $req ) ) {
 717                         wfDebugLog( 'runJobs', "Failed to start cron API (socket write error)\n" );
 718                 } else {
 719                         // Do not wait for the response (the script should handle client aborts).
 720                         // Make sure that we don't close before that script reaches ignore_user_abort().
 721                         $status = fgets( $sock );
 722                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 723                                 wfDebugLog( 'runJobs', "Failed to start cron API: received '$status'\n" );
 724                         }
 725                 }
 726                 fclose( $sock );
 727         }
 728 }