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          * @var String Cache what action this request is
  41          */
  42         private $action;
  43
  44         /**
  45          * @param IContextSource|null $context
  46          */
  47         public function __construct( IContextSource $context = null ) {
  48                 if ( !$context ) {
  49                         $context = RequestContext::getMain();
  50                 }
  51
  52                 $this->context = $context;
  53                 $this->config = $context->getConfig();
  54         }
  55
  56         /**
  57          * Parse the request to get the Title object
  58          *
  59          * @throws MalformedTitleException If a title has been provided by the user, but is invalid.
  60          * @return Title Title object to be $wgTitle
  61          */
  62         private function parseTitle() {
  63                 global $wgContLang;
  64
  65                 $request = $this->context->getRequest();
  66                 $curid = $request->getInt( 'curid' );
  67                 $title = $request->getVal( 'title' );
  68                 $action = $request->getVal( 'action' );
  69
  70                 if ( $request->getCheck( 'search' ) ) {
  71                         // Compatibility with old search URLs which didn't use Special:Search
  72                         // Just check for presence here, so blank requests still
  73                         // show the search page when using ugly URLs (bug 8054).
  74                         $ret = SpecialPage::getTitleFor( 'Search' );
  75                 } elseif ( $curid ) {
  76                         // URLs like this are generated by RC, because rc_title isn't always accurate
  77                         $ret = Title::newFromID( $curid );
  78                 } else {
  79                         $ret = Title::newFromURL( $title );
  80                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  81                         // in wikitext links to tell Parser to make a direct file link
  82                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  83                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  84                         }
  85                         // Check variant links so that interwiki links don't have to worry
  86                         // about the possible different language variants
  87                         if ( count( $wgContLang->getVariants() ) > 1
  88                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  89                         ) {
  90                                 $wgContLang->findVariantLink( $title, $ret );
  91                         }
  92                 }
  93
  94                 // If title is not provided, always allow oldid and diff to set the title.
  95                 // If title is provided, allow oldid and diff to override the title, unless
  96                 // we are talking about a special page which might use these parameters for
  97                 // other purposes.
  98                 if ( $ret === null || !$ret->isSpecialPage() ) {
  99                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 100                         $oldid = $request->getInt( 'oldid' );
 101                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 102                         // Allow oldid to override a changed or missing title
 103                         if ( $oldid ) {
 104                                 $rev = Revision::newFromId( $oldid );
 105                                 $ret = $rev ? $rev->getTitle() : $ret;
 106                         }
 107                 }
 108
 109                 // Use the main page as default title if nothing else has been provided
 110                 if ( $ret === null
 111                         && strval( $title ) === ''
 112                         && !$request->getCheck( 'curid' )
 113                         && $action !== 'delete'
 114                 ) {
 115                         $ret = Title::newMainPage();
 116                 }
 117
 118                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 119                         // If we get here, we definitely don't have a valid title; throw an exception.
 120                         // Try to get detailed invalid title exception first, fall back to MalformedTitleException.
 121                         Title::newFromTextThrow( $title );
 122                         throw new MalformedTitleException( 'badtitletext', $title );
 123                 }
 124
 125                 return $ret;
 126         }
 127
 128         /**
 129          * Get the Title object that we'll be acting on, as specified in the WebRequest
 130          * @return Title
 131          */
 132         public function getTitle() {
 133                 if ( !$this->context->hasTitle() ) {
 134                         try {
 135                                 $this->context->setTitle( $this->parseTitle() );
 136                         } catch ( MalformedTitleException $ex ) {
 137                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 138                         }
 139                 }
 140                 return $this->context->getTitle();
 141         }
 142
 143         /**
 144          * Returns the name of the action that will be executed.
 145          *
 146          * @return string Action
 147          */
 148         public function getAction() {
 149                 if ( $this->action === null ) {
 150                         $this->action = Action::getActionName( $this->context );
 151                 }
 152
 153                 return $this->action;
 154         }
 155
 156         /**
 157          * Performs the request.
 158          * - bad titles
 159          * - read restriction
 160          * - local interwiki redirects
 161          * - redirect loop
 162          * - special pages
 163          * - normal pages
 164          *
 165          * @throws MWException|PermissionsError|BadTitleError|HttpError
 166          * @return void
 167          */
 168         private function performRequest() {
 169                 global $wgTitle;
 170
 171                 $request = $this->context->getRequest();
 172                 $requestTitle = $title = $this->context->getTitle();
 173                 $output = $this->context->getOutput();
 174                 $user = $this->context->getUser();
 175
 176                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 177                         $output->setPrintable();
 178                 }
 179
 180                 $unused = null; // To pass it by reference
 181                 Hooks::run( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 182
 183                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 184                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 185                         || $title->isSpecial( 'Badtitle' )
 186                 ) {
 187                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 188                         try {
 189                                 $this->parseTitle();
 190                         } catch ( MalformedTitleException $ex ) {
 191                                 throw new BadTitleError( $ex );
 192                         }
 193                         throw new BadTitleError();
 194                 }
 195
 196                 // Check user's permissions to read this page.
 197                 // We have to check here to catch special pages etc.
 198                 // We will check again in Article::view().
 199                 $permErrors = $title->isSpecial( 'RunJobs' )
 200                         ? array() // relies on HMAC key signature alone
 201                         : $title->getUserPermissionsErrors( 'read', $user );
 202                 if ( count( $permErrors ) ) {
 203                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 204                         // $this->context->title set to the input title would allow anonymous users to
 205                         // determine whether a page exists, potentially leaking private data. In fact, the
 206                         // curid and oldid request  parameters would allow page titles to be enumerated even
 207                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 208                         // permissions error is displayed.
 209
 210                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 211                         // still use $wgTitle.
 212                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 213                         $this->context->setTitle( $badTitle );
 214                         $wgTitle = $badTitle;
 215
 216                         throw new PermissionsError( 'read', $permErrors );
 217                 }
 218
 219                 // Interwiki redirects
 220                 if ( $title->isExternal() ) {
 221                         $rdfrom = $request->getVal( 'rdfrom' );
 222                         if ( $rdfrom ) {
 223                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 224                         } else {
 225                                 $query = $request->getValues();
 226                                 unset( $query['title'] );
 227                                 $url = $title->getFullURL( $query );
 228                         }
 229                         // Check for a redirect loop
 230                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 231                                 && $title->isLocal()
 232                         ) {
 233                                 // 301 so google et al report the target as the actual url.
 234                                 $output->redirect( $url, 301 );
 235                         } else {
 236                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 237                                 try {
 238                                         $this->parseTitle();
 239                                 } catch ( MalformedTitleException $ex ) {
 240                                         throw new BadTitleError( $ex );
 241                                 }
 242                                 throw new BadTitleError();
 243                         }
 244                 // Handle any other redirects.
 245                 // Redirect loops, titleless URL, $wgUsePathInfo URLs, and URLs with a variant
 246                 } elseif ( !$this->tryNormaliseRedirect( $title ) ) {
 247                         // Prevent information leak via Special:MyPage et al (T109724)
 248                         if ( $title->isSpecialPage() ) {
 249                                 $specialPage = SpecialPageFactory::getPage( $title->getDBKey() );
 250                                 if ( $specialPage instanceof RedirectSpecialPage ) {
 251                                         $specialPage->setContext( $this->context );
 252                                         if ( $this->config->get( 'HideIdentifiableRedirects' )
 253                                                 && $specialPage->personallyIdentifiableTarget()
 254                                         ) {
 255                                                 list( , $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBKey() );
 256                                                 $target = $specialPage->getRedirect( $subpage );
 257                                                 // target can also be true. We let that case fall through to normal processing.
 258                                                 if ( $target instanceof Title ) {
 259                                                         $query = $specialPage->getRedirectQuery() ?: array();
 260                                                         $request = new DerivativeRequest( $this->context->getRequest(), $query );
 261                                                         $request->setRequestURL( $this->context->getRequest()->getRequestURL() );
 262                                                         $this->context->setRequest( $request );
 263                                                         // Do not varnish cache these. May vary even for anons
 264                                                         $this->context->getOutput()->lowerCdnMaxage( 0 );
 265                                                         $this->context->setTitle( $target );
 266                                                         $wgTitle = $target;
 267                                                         // Reset action type cache. (Special pages have only view)
 268                                                         $this->action = null;
 269                                                         $title = $target;
 270                                                         $output->addJsConfigVars( array(
 271                                                                 'wgInternalRedirectTargetUrl' => $target->getFullURL( $query ),
 272                                                         ) );
 273                                                         $output->addModules( 'mediawiki.action.view.redirect' );
 274                                                 }
 275                                         }
 276                                 }
 277                         }
 278
 279                         // Special pages ($title may have changed since if statement above)
 280                         if ( NS_SPECIAL == $title->getNamespace() ) {
 281                                 // Actions that need to be made when we have a special pages
 282                                 SpecialPageFactory::executePath( $title, $this->context );
 283                         } else {
 284                                 // ...otherwise treat it as an article view. The article
 285                                 // may still be a wikipage redirect to another article or URL.
 286                                 $article = $this->initializeArticle();
 287                                 if ( is_object( $article ) ) {
 288                                         $this->performAction( $article, $requestTitle );
 289                                 } elseif ( is_string( $article ) ) {
 290                                         $output->redirect( $article );
 291                                 } else {
 292                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 293                                                 . " returned neither an object nor a URL" );
 294                                 }
 295                         }
 296                 }
 297         }
 298
 299         /**
 300          * Handle redirects for uncanonical title requests.
 301          *
 302          * Handles:
 303          * - Redirect loops.
 304          * - No title in URL.
 305          * - $wgUsePathInfo URLs.
 306          * - URLs with a variant.
 307          * - Other non-standard URLs (as long as they have no extra query parameters).
 308          *
 309          * Behaviour:
 310          * - Normalise title values:
 311          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 312          * - Normalise empty title:
 313          *   /wiki/ -> /wiki/Main
 314          *   /w/index.php?title= -> /wiki/Main
 315          * - Normalise non-standard title urls:
 316          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 317          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 318          *
 319          * @param Title $title
 320          * @return bool True if a redirect was set.
 321          * @throws HttpError
 322          */
 323         private function tryNormaliseRedirect( Title $title ) {
 324                 $request = $this->context->getRequest();
 325                 $output = $this->context->getOutput();
 326
 327                 if ( $request->getVal( 'action', 'view' ) != 'view'
 328                         || $request->wasPosted()
 329                         || count( $request->getValueNames( array( 'action', 'title' ) ) )
 330                         || !Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 331                 ) {
 332                         return false;
 333                 }
 334
 335                 if ( $title->isSpecialPage() ) {
 336                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 337                         if ( $name ) {
 338                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 339                         }
 340                 }
 341                 // Redirect to canonical url, make it a 301 to allow caching
 342                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 343
 344                 if ( $targetUrl != $request->getFullRequestURL() ) {
 345                         $output->setCdnMaxage( 1200 );
 346                         $output->redirect( $targetUrl, '301' );
 347                         return true;
 348                 }
 349
 350                 // If there is no title, or the title is in a non-standard encoding, we demand
 351                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 352                 // the url is standard, the server is misconfigured.
 353                 if ( $request->getVal( 'title' ) === null
 354                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 355                 ) {
 356                         $message = "Redirect loop detected!\n\n" .
 357                                 "This means the wiki got confused about what page was " .
 358                                 "requested; this sometimes happens when moving a wiki " .
 359                                 "to a new server or changing the server configuration.\n\n";
 360
 361                         if ( $this->config->get( 'UsePathInfo' ) ) {
 362                                 $message .= "The wiki is trying to interpret the page " .
 363                                         "title from the URL path portion (PATH_INFO), which " .
 364                                         "sometimes fails depending on the web server. Try " .
 365                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 366                                         "LocalSettings.php, or check that \$wgArticlePath " .
 367                                         "is correct.";
 368                         } else {
 369                                 $message .= "Your web server was detected as possibly not " .
 370                                         "supporting URL path components (PATH_INFO) correctly; " .
 371                                         "check your LocalSettings.php for a customized " .
 372                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 373                                         "to true.";
 374                         }
 375                         throw new HttpError( 500, $message );
 376                 }
 377                 return false;
 378         }
 379
 380         /**
 381          * Initialize the main Article object for "standard" actions (view, etc)
 382          * Create an Article object for the page, following redirects if needed.
 383          *
 384          * @return Article|string An Article, or a string to redirect to another URL
 385          */
 386         private function initializeArticle() {
 387                 $title = $this->context->getTitle();
 388                 if ( $this->context->canUseWikiPage() ) {
 389                         // Try to use request context wiki page, as there
 390                         // is already data from db saved in per process
 391                         // cache there from this->getAction() call.
 392                         $page = $this->context->getWikiPage();
 393                 } else {
 394                         // This case should not happen, but just in case.
 395                         // @TODO: remove this or use an exception
 396                         $page = WikiPage::factory( $title );
 397                         $this->context->setWikiPage( $page );
 398                         wfWarn( "RequestContext::canUseWikiPage() returned false" );
 399                 }
 400
 401                 // Make GUI wrapper for the WikiPage
 402                 $article = Article::newFromWikiPage( $page, $this->context );
 403
 404                 // Skip some unnecessary code if the content model doesn't support redirects
 405                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 406                         return $article;
 407                 }
 408
 409                 $request = $this->context->getRequest();
 410
 411                 // Namespace might change when using redirects
 412                 // Check for redirects ...
 413                 $action = $request->getVal( 'action', 'view' );
 414                 $file = ( $page instanceof WikiFilePage ) ? $page->getFile() : null;
 415                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 416                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 417                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 418                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 419                         // ... and the article is not a non-redirect image page with associated file
 420                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 421                 ) {
 422                         // Give extensions a change to ignore/handle redirects as needed
 423                         $ignoreRedirect = $target = false;
 424
 425                         Hooks::run( 'InitializeArticleMaybeRedirect',
 426                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 427                         $page = $article->getPage(); // reflect any hook changes
 428
 429                         // Follow redirects only for... redirects.
 430                         // If $target is set, then a hook wanted to redirect.
 431                         if ( !$ignoreRedirect && ( $target || $page->isRedirect() ) ) {
 432                                 // Is the target already set by an extension?
 433                                 $target = $target ? $target : $page->followRedirect();
 434                                 if ( is_string( $target ) ) {
 435                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 436                                                 // we'll need to redirect
 437                                                 return $target;
 438                                         }
 439                                 }
 440                                 if ( is_object( $target ) ) {
 441                                         // Rewrite environment to redirected article
 442                                         $rpage = WikiPage::factory( $target );
 443                                         $rpage->loadPageData();
 444                                         if ( $rpage->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 445                                                 $rarticle = Article::newFromWikiPage( $rpage, $this->context );
 446                                                 $rarticle->setRedirectedFrom( $title );
 447
 448                                                 $article = $rarticle;
 449                                                 $this->context->setTitle( $target );
 450                                                 $this->context->setWikiPage( $article->getPage() );
 451                                         }
 452                                 }
 453                         } else {
 454                                 // Article may have been changed by hook
 455                                 $this->context->setTitle( $article->getTitle() );
 456                                 $this->context->setWikiPage( $article->getPage() );
 457                         }
 458                 }
 459
 460                 return $article;
 461         }
 462
 463         /**
 464          * Perform one of the "standard" actions
 465          *
 466          * @param Page $page
 467          * @param Title $requestTitle The original title, before any redirects were applied
 468          */
 469         private function performAction( Page $page, Title $requestTitle ) {
 470                 $request = $this->context->getRequest();
 471                 $output = $this->context->getOutput();
 472                 $title = $this->context->getTitle();
 473                 $user = $this->context->getUser();
 474
 475                 if ( !Hooks::run( 'MediaWikiPerformAction',
 476                                 array( $output, $page, $title, $user, $request, $this ) )
 477                 ) {
 478                         return;
 479                 }
 480
 481                 $act = $this->getAction();
 482                 $action = Action::factory( $act, $page, $this->context );
 483
 484                 if ( $action instanceof Action ) {
 485                         // Narrow DB query expectations for this HTTP request
 486                         $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 487                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 488                         if ( $request->wasPosted() && !$action->doesWrites() ) {
 489                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 490                         }
 491
 492                         # Let CDN cache things if we can purge them.
 493                         if ( $this->config->get( 'UseSquid' ) &&
 494                                 in_array(
 495                                         // Use PROTO_INTERNAL because that's what getCdnUrls() uses
 496                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 497                                         $requestTitle->getCdnUrls()
 498                                 )
 499                         ) {
 500                                 $output->setCdnMaxage( $this->config->get( 'SquidMaxage' ) );
 501                         }
 502
 503                         $action->show();
 504                         return;
 505                 }
 506
 507                 if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 508                         $output->setStatusCode( 404 );
 509                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 510                 }
 511         }
 512
 513         /**
 514          * Run the current MediaWiki instance; index.php just calls this
 515          */
 516         public function run() {
 517                 try {
 518                         try {
 519                                 $this->main();
 520                         } catch ( ErrorPageError $e ) {
 521                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 522                                 // they are not internal application faults. As with normal requests, this
 523                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 524                                 $this->doPreOutputCommit();
 525                                 $e->report(); // display the GUI error
 526                         }
 527                 } catch ( Exception $e ) {
 528                         MWExceptionHandler::handleException( $e );
 529                 }
 530
 531                 $this->doPostOutputShutdown( 'normal' );
 532         }
 533
 534         /**
 535          * @see MediaWiki::preOutputCommit()
 536          * @since 1.26
 537          */
 538         public function doPreOutputCommit() {
 539                 self::preOutputCommit( $this->context );
 540         }
 541
 542         /**
 543          * This function commits all DB changes as needed before
 544          * the user can receive a response (in case commit fails)
 545          *
 546          * @param IContextSource $context
 547          * @since 1.27
 548          */
 549         public static function preOutputCommit( IContextSource $context ) {
 550                 // Either all DBs should commit or none
 551                 ignore_user_abort( true );
 552
 553                 $config = $context->getConfig();
 554
 555                 $factory = wfGetLBFactory();
 556                 // Commit all changes
 557                 $factory->commitMasterChanges(
 558                         __METHOD__,
 559                         // Abort if any transaction was too big
 560                         array( 'maxWriteDuration' => $config->get( 'MaxUserDBWriteDuration' ) )
 561                 );
 562                 // Record ChronologyProtector positions
 563                 $factory->shutdown();
 564                 wfDebug( __METHOD__ . ': all transactions committed' );
 565
 566                 DeferredUpdates::doUpdates( 'enqueue', DeferredUpdates::PRESEND );
 567                 wfDebug( __METHOD__ . ': pre-send deferred updates completed' );
 568
 569                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the DC that handles this
 570                 // POST request (e.g. the "master" data center). Also have the user briefly bypass CDN so
 571                 // ChronologyProtector works for cacheable URLs.
 572                 $request = $context->getRequest();
 573                 if ( $request->wasPosted() && $factory->hasOrMadeRecentMasterChanges() ) {
 574                         $expires = time() + $config->get( 'DataCenterUpdateStickTTL' );
 575                         $options = array( 'prefix' => '' );
 576                         $request->response()->setCookie( 'UseDC', 'master', $expires, $options );
 577                         $request->response()->setCookie( 'UseCDNCache', 'false', $expires, $options );
 578                 }
 579
 580                 // Avoid letting a few seconds of slave lag cause a month of stale data. This logic is
 581                 // also intimately related to the value of $wgCdnReboundPurgeDelay.
 582                 if ( $factory->laggedSlaveUsed() ) {
 583                         $maxAge = $config->get( 'CdnMaxageLagged' );
 584                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 585                         $request->response()->header( "X-Database-Lagged: true" );
 586                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 587                 }
 588         }
 589
 590         /**
 591          * This function does work that can be done *after* the
 592          * user gets the HTTP response so they don't block on it
 593          *
 594          * This manages deferred updates, job insertion,
 595          * final commit, and the logging of profiling data
 596          *
 597          * @param string $mode Use 'fast' to always skip job running
 598          * @since 1.26
 599          */
 600         public function doPostOutputShutdown( $mode = 'normal' ) {
 601                 $timing = $this->context->getTiming();
 602                 $timing->mark( 'requestShutdown' );
 603
 604                 // Show visible profiling data if enabled (which cannot be post-send)
 605                 Profiler::instance()->logDataPageOutputOnly();
 606
 607                 $that = $this;
 608                 $callback = function () use ( $that, $mode ) {
 609                         try {
 610                                 $that->restInPeace( $mode );
 611                         } catch ( Exception $e ) {
 612                                 MWExceptionHandler::handleException( $e );
 613                         }
 614                 };
 615
 616                 // Defer everything else...
 617                 if ( function_exists( 'register_postsend_function' ) ) {
 618                         // https://github.com/facebook/hhvm/issues/1230
 619                         register_postsend_function( $callback );
 620                 } else {
 621                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 622                                 fastcgi_finish_request();
 623                         } else {
 624                                 // Either all DB and deferred updates should happen or none.
 625                                 // The later should not be cancelled due to client disconnect.
 626                                 ignore_user_abort( true );
 627                         }
 628
 629                         $callback();
 630                 }
 631         }
 632
 633         private function main() {
 634                 global $wgTitle;
 635
 636                 $request = $this->context->getRequest();
 637
 638                 // Send Ajax requests to the Ajax dispatcher.
 639                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 640                         // Set a dummy title, because $wgTitle == null might break things
 641                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 642                                 . __METHOD__
 643                         );
 644                         $this->context->setTitle( $title );
 645                         $wgTitle = $title;
 646
 647                         $dispatcher = new AjaxDispatcher( $this->config );
 648                         $dispatcher->performAction( $this->context->getUser() );
 649                         return;
 650                 }
 651
 652                 // Get title from request parameters,
 653                 // is set on the fly by parseTitle the first time.
 654                 $title = $this->getTitle();
 655                 $action = $this->getAction();
 656                 $wgTitle = $title;
 657
 658                 // Set DB query expectations for this HTTP request
 659                 $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 660                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 661                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 662                 if ( $request->wasPosted() ) {
 663                         $trxProfiler->setExpectations( $trxLimits['POST'], __METHOD__ );
 664                 } else {
 665                         $trxProfiler->setExpectations( $trxLimits['GET'], __METHOD__ );
 666                 }
 667
 668                 // If the user has forceHTTPS set to true, or if the user
 669                 // is in a group requiring HTTPS, or if they have the HTTPS
 670                 // preference set, redirect them to HTTPS.
 671                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 672                 // isLoggedIn() will do all sorts of weird stuff.
 673                 if (
 674                         $request->getProtocol() == 'http' &&
 675                         (
 676                                 $request->getSession()->shouldForceHTTPS() ||
 677                                 // Check the cookie manually, for paranoia
 678                                 $request->getCookie( 'forceHTTPS', '' ) ||
 679                                 // check for prefixed version that was used for a time in older MW versions
 680                                 $request->getCookie( 'forceHTTPS' ) ||
 681                                 // Avoid checking the user and groups unless it's enabled.
 682                                 (
 683                                         $this->context->getUser()->isLoggedIn()
 684                                         && $this->context->getUser()->requiresHTTPS()
 685                                 )
 686                         )
 687                 ) {
 688                         $oldUrl = $request->getFullRequestURL();
 689                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 690
 691                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 692                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 693
 694                                 if ( $request->wasPosted() ) {
 695                                         // This is weird and we'd hope it almost never happens. This
 696                                         // means that a POST came in via HTTP and policy requires us
 697                                         // redirecting to HTTPS. It's likely such a request is going
 698                                         // to fail due to post data being lost, but let's try anyway
 699                                         // and just log the instance.
 700
 701                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 702                                         // to see how clients (automated & browser) behave when we do
 703                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 704                                 }
 705                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 706                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 707                                 $this->context->setTitle( $title );
 708                                 $output = $this->context->getOutput();
 709                                 // Since we only do this redir to change proto, always send a vary header
 710                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 711                                 $output->redirect( $redirUrl );
 712                                 $output->output();
 713                                 return;
 714                         }
 715                 }
 716
 717                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 718                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 719                                 // Try low-level file cache hit
 720                                 $cache = new HTMLFileCache( $title, $action );
 721                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 722                                         // Check incoming headers to see if client has this cached
 723                                         $timestamp = $cache->cacheTimestamp();
 724                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 725                                                 $cache->loadFromFileCache( $this->context );
 726                                         }
 727                                         // Do any stats increment/watchlist stuff
 728                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 729                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 730                                         // Tell OutputPage that output is taken care of
 731                                         $this->context->getOutput()->disable();
 732                                         return;
 733                                 }
 734                         }
 735                 }
 736
 737                 // Actually do the work of the request and build up any output
 738                 $this->performRequest();
 739
 740                 // Now commit any transactions, so that unreported errors after
 741                 // output() don't roll back the whole DB transaction and so that
 742                 // we avoid having both success and error text in the response
 743                 $this->doPreOutputCommit();
 744
 745                 // Output everything!
 746                 $this->context->getOutput()->output();
 747         }
 748
 749         /**
 750          * Ends this task peacefully
 751          * @param string $mode Use 'fast' to always skip job running
 752          */
 753         public function restInPeace( $mode = 'fast' ) {
 754                 // Assure deferred updates are not in the main transaction
 755                 wfGetLBFactory()->commitMasterChanges( __METHOD__ );
 756
 757                 // Ignore things like master queries/connections on GET requests
 758                 // as long as they are in deferred updates (which catch errors).
 759                 Profiler::instance()->getTransactionProfiler()->resetExpectations();
 760
 761                 // Do any deferred jobs
 762                 DeferredUpdates::doUpdates( 'enqueue' );
 763
 764                 // Make sure any lazy jobs are pushed
 765                 JobQueueGroup::pushLazyJobs();
 766
 767                 // Now that everything specific to this request is done,
 768                 // try to occasionally run jobs (if enabled) from the queues
 769                 if ( $mode === 'normal' ) {
 770                         $this->triggerJobs();
 771                 }
 772
 773                 // Log profiling data, e.g. in the database or UDP
 774                 wfLogProfilingData();
 775
 776                 // Commit and close up!
 777                 $factory = wfGetLBFactory();
 778                 $factory->commitMasterChanges( __METHOD__ );
 779                 $factory->shutdown( LBFactory::SHUTDOWN_NO_CHRONPROT );
 780
 781                 wfDebug( "Request ended normally\n" );
 782         }
 783
 784         /**
 785          * Potentially open a socket and sent an HTTP request back to the server
 786          * to run a specified number of jobs. This registers a callback to cleanup
 787          * the socket once it's done.
 788          */
 789         public function triggerJobs() {
 790                 $jobRunRate = $this->config->get( 'JobRunRate' );
 791                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 792                         return;
 793                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 794                         return; // recursion guard
 795                 }
 796
 797                 if ( $jobRunRate < 1 ) {
 798                         $max = mt_getrandmax();
 799                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 800                                 return; // the higher the job run rate, the less likely we return here
 801                         }
 802                         $n = 1;
 803                 } else {
 804                         $n = intval( $jobRunRate );
 805                 }
 806
 807                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 808
 809                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 810                         // Fall back to running the job here while the user waits
 811                         $runner = new JobRunner( $runJobsLogger );
 812                         $runner->run( array( 'maxJobs'  => $n ) );
 813                         return;
 814                 }
 815
 816                 try {
 817                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 818                                 return; // do not send request if there are probably no jobs
 819                         }
 820                 } catch ( JobQueueError $e ) {
 821                         MWExceptionHandler::logException( $e );
 822                         return; // do not make the site unavailable
 823                 }
 824
 825                 $query = array( 'title' => 'Special:RunJobs',
 826                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 827                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 828                         $query, $this->config->get( 'SecretKey' ) );
 829
 830                 $errno = $errstr = null;
 831                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 832                 MediaWiki\suppressWarnings();
 833                 $sock = fsockopen(
 834                         $info['host'],
 835                         isset( $info['port'] ) ? $info['port'] : 80,
 836                         $errno,
 837                         $errstr,
 838                         // If it takes more than 100ms to connect to ourselves there
 839                         // is a problem elsewhere.
 840                         0.1
 841                 );
 842                 MediaWiki\restoreWarnings();
 843                 if ( !$sock ) {
 844                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 845                         // Fall back to running the job here while the user waits
 846                         $runner = new JobRunner( $runJobsLogger );
 847                         $runner->run( array( 'maxJobs'  => $n ) );
 848                         return;
 849                 }
 850
 851                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 852                 $req = (
 853                         "POST $url HTTP/1.1\r\n" .
 854                         "Host: {$info['host']}\r\n" .
 855                         "Connection: Close\r\n" .
 856                         "Content-Length: 0\r\n\r\n"
 857                 );
 858
 859                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 860                 // Send a cron API request to be performed in the background.
 861                 // Give up if this takes too long to send (which should be rare).
 862                 stream_set_timeout( $sock, 1 );
 863                 $bytes = fwrite( $sock, $req );
 864                 if ( $bytes !== strlen( $req ) ) {
 865                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 866                 } else {
 867                         // Do not wait for the response (the script should handle client aborts).
 868                         // Make sure that we don't close before that script reaches ignore_user_abort().
 869                         $status = fgets( $sock );
 870                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 871                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 872                         }
 873                 }
 874                 fclose( $sock );
 875         }
 876 }