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 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * The MediaWiki class is the helper class for the index.php entry point.
  28  */
  29 class MediaWiki {
  30         /**
  31          * @var IContextSource
  32          */
  33         private $context;
  34
  35         /**
  36          * @var Config
  37          */
  38         private $config;
  39
  40         /**
  41          * @var String Cache what action this request is
  42          */
  43         private $action;
  44
  45         /**
  46          * @param IContextSource|null $context
  47          */
  48         public function __construct( IContextSource $context = null ) {
  49                 if ( !$context ) {
  50                         $context = RequestContext::getMain();
  51                 }
  52
  53                 $this->context = $context;
  54                 $this->config = $context->getConfig();
  55         }
  56
  57         /**
  58          * Parse the request to get the Title object
  59          *
  60          * @throws MalformedTitleException If a title has been provided by the user, but is invalid.
  61          * @return Title Title object to be $wgTitle
  62          */
  63         private function parseTitle() {
  64                 global $wgContLang;
  65
  66                 $request = $this->context->getRequest();
  67                 $curid = $request->getInt( 'curid' );
  68                 $title = $request->getVal( 'title' );
  69                 $action = $request->getVal( 'action' );
  70
  71                 if ( $request->getCheck( 'search' ) ) {
  72                         // Compatibility with old search URLs which didn't use Special:Search
  73                         // Just check for presence here, so blank requests still
  74                         // show the search page when using ugly URLs (bug 8054).
  75                         $ret = SpecialPage::getTitleFor( 'Search' );
  76                 } elseif ( $curid ) {
  77                         // URLs like this are generated by RC, because rc_title isn't always accurate
  78                         $ret = Title::newFromID( $curid );
  79                 } else {
  80                         $ret = Title::newFromURL( $title );
  81                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  82                         // in wikitext links to tell Parser to make a direct file link
  83                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  84                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  85                         }
  86                         // Check variant links so that interwiki links don't have to worry
  87                         // about the possible different language variants
  88                         if ( count( $wgContLang->getVariants() ) > 1
  89                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  90                         ) {
  91                                 $wgContLang->findVariantLink( $title, $ret );
  92                         }
  93                 }
  94
  95                 // If title is not provided, always allow oldid and diff to set the title.
  96                 // If title is provided, allow oldid and diff to override the title, unless
  97                 // we are talking about a special page which might use these parameters for
  98                 // other purposes.
  99                 if ( $ret === null || !$ret->isSpecialPage() ) {
 100                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 101                         $oldid = $request->getInt( 'oldid' );
 102                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 103                         // Allow oldid to override a changed or missing title
 104                         if ( $oldid ) {
 105                                 $rev = Revision::newFromId( $oldid );
 106                                 $ret = $rev ? $rev->getTitle() : $ret;
 107                         }
 108                 }
 109
 110                 // Use the main page as default title if nothing else has been provided
 111                 if ( $ret === null
 112                         && strval( $title ) === ''
 113                         && !$request->getCheck( 'curid' )
 114                         && $action !== 'delete'
 115                 ) {
 116                         $ret = Title::newMainPage();
 117                 }
 118
 119                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 120                         // If we get here, we definitely don't have a valid title; throw an exception.
 121                         // Try to get detailed invalid title exception first, fall back to MalformedTitleException.
 122                         Title::newFromTextThrow( $title );
 123                         throw new MalformedTitleException( 'badtitletext', $title );
 124                 }
 125
 126                 return $ret;
 127         }
 128
 129         /**
 130          * Get the Title object that we'll be acting on, as specified in the WebRequest
 131          * @return Title
 132          */
 133         public function getTitle() {
 134                 if ( !$this->context->hasTitle() ) {
 135                         try {
 136                                 $this->context->setTitle( $this->parseTitle() );
 137                         } catch ( MalformedTitleException $ex ) {
 138                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 139                         }
 140                 }
 141                 return $this->context->getTitle();
 142         }
 143
 144         /**
 145          * Returns the name of the action that will be executed.
 146          *
 147          * @return string Action
 148          */
 149         public function getAction() {
 150                 if ( $this->action === null ) {
 151                         $this->action = Action::getActionName( $this->context );
 152                 }
 153
 154                 return $this->action;
 155         }
 156
 157         /**
 158          * Performs the request.
 159          * - bad titles
 160          * - read restriction
 161          * - local interwiki redirects
 162          * - redirect loop
 163          * - special pages
 164          * - normal pages
 165          *
 166          * @throws MWException|PermissionsError|BadTitleError|HttpError
 167          * @return void
 168          */
 169         private function performRequest() {
 170                 global $wgTitle;
 171
 172                 $request = $this->context->getRequest();
 173                 $requestTitle = $title = $this->context->getTitle();
 174                 $output = $this->context->getOutput();
 175                 $user = $this->context->getUser();
 176
 177                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 178                         $output->setPrintable();
 179                 }
 180
 181                 $unused = null; // To pass it by reference
 182                 Hooks::run( 'BeforeInitialize', [ &$title, &$unused, &$output, &$user, $request, $this ] );
 183
 184                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 185                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 186                         || $title->isSpecial( 'Badtitle' )
 187                 ) {
 188                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 189                         try {
 190                                 $this->parseTitle();
 191                         } catch ( MalformedTitleException $ex ) {
 192                                 throw new BadTitleError( $ex );
 193                         }
 194                         throw new BadTitleError();
 195                 }
 196
 197                 // Check user's permissions to read this page.
 198                 // We have to check here to catch special pages etc.
 199                 // We will check again in Article::view().
 200                 $permErrors = $title->isSpecial( 'RunJobs' )
 201                         ? [] // relies on HMAC key signature alone
 202                         : $title->getUserPermissionsErrors( 'read', $user );
 203                 if ( count( $permErrors ) ) {
 204                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 205                         // $this->context->title set to the input title would allow anonymous users to
 206                         // determine whether a page exists, potentially leaking private data. In fact, the
 207                         // curid and oldid request  parameters would allow page titles to be enumerated even
 208                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 209                         // permissions error is displayed.
 210
 211                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 212                         // still use $wgTitle.
 213                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 214                         $this->context->setTitle( $badTitle );
 215                         $wgTitle = $badTitle;
 216
 217                         throw new PermissionsError( 'read', $permErrors );
 218                 }
 219
 220                 // Interwiki redirects
 221                 if ( $title->isExternal() ) {
 222                         $rdfrom = $request->getVal( 'rdfrom' );
 223                         if ( $rdfrom ) {
 224                                 $url = $title->getFullURL( [ 'rdfrom' => $rdfrom ] );
 225                         } else {
 226                                 $query = $request->getValues();
 227                                 unset( $query['title'] );
 228                                 $url = $title->getFullURL( $query );
 229                         }
 230                         // Check for a redirect loop
 231                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 232                                 && $title->isLocal()
 233                         ) {
 234                                 // 301 so google et al report the target as the actual url.
 235                                 $output->redirect( $url, 301 );
 236                         } else {
 237                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 238                                 try {
 239                                         $this->parseTitle();
 240                                 } catch ( MalformedTitleException $ex ) {
 241                                         throw new BadTitleError( $ex );
 242                                 }
 243                                 throw new BadTitleError();
 244                         }
 245                 // Handle any other redirects.
 246                 // Redirect loops, titleless URL, $wgUsePathInfo URLs, and URLs with a variant
 247                 } elseif ( !$this->tryNormaliseRedirect( $title ) ) {
 248                         // Prevent information leak via Special:MyPage et al (T109724)
 249                         if ( $title->isSpecialPage() ) {
 250                                 $specialPage = SpecialPageFactory::getPage( $title->getDBkey() );
 251                                 if ( $specialPage instanceof RedirectSpecialPage ) {
 252                                         $specialPage->setContext( $this->context );
 253                                         if ( $this->config->get( 'HideIdentifiableRedirects' )
 254                                                 && $specialPage->personallyIdentifiableTarget()
 255                                         ) {
 256                                                 list( , $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 257                                                 $target = $specialPage->getRedirect( $subpage );
 258                                                 // target can also be true. We let that case fall through to normal processing.
 259                                                 if ( $target instanceof Title ) {
 260                                                         $query = $specialPage->getRedirectQuery() ?: [];
 261                                                         $request = new DerivativeRequest( $this->context->getRequest(), $query );
 262                                                         $request->setRequestURL( $this->context->getRequest()->getRequestURL() );
 263                                                         $this->context->setRequest( $request );
 264                                                         // Do not varnish cache these. May vary even for anons
 265                                                         $this->context->getOutput()->lowerCdnMaxage( 0 );
 266                                                         $this->context->setTitle( $target );
 267                                                         $wgTitle = $target;
 268                                                         // Reset action type cache. (Special pages have only view)
 269                                                         $this->action = null;
 270                                                         $title = $target;
 271                                                         $output->addJsConfigVars( [
 272                                                                 'wgInternalRedirectTargetUrl' => $target->getFullURL( $query ),
 273                                                         ] );
 274                                                         $output->addModules( 'mediawiki.action.view.redirect' );
 275                                                 }
 276                                         }
 277                                 }
 278                         }
 279
 280                         // Special pages ($title may have changed since if statement above)
 281                         if ( NS_SPECIAL == $title->getNamespace() ) {
 282                                 // Actions that need to be made when we have a special pages
 283                                 SpecialPageFactory::executePath( $title, $this->context );
 284                         } else {
 285                                 // ...otherwise treat it as an article view. The article
 286                                 // may still be a wikipage redirect to another article or URL.
 287                                 $article = $this->initializeArticle();
 288                                 if ( is_object( $article ) ) {
 289                                         $this->performAction( $article, $requestTitle );
 290                                 } elseif ( is_string( $article ) ) {
 291                                         $output->redirect( $article );
 292                                 } else {
 293                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 294                                                 . " returned neither an object nor a URL" );
 295                                 }
 296                         }
 297                 }
 298         }
 299
 300         /**
 301          * Handle redirects for uncanonical title requests.
 302          *
 303          * Handles:
 304          * - Redirect loops.
 305          * - No title in URL.
 306          * - $wgUsePathInfo URLs.
 307          * - URLs with a variant.
 308          * - Other non-standard URLs (as long as they have no extra query parameters).
 309          *
 310          * Behaviour:
 311          * - Normalise title values:
 312          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 313          * - Normalise empty title:
 314          *   /wiki/ -> /wiki/Main
 315          *   /w/index.php?title= -> /wiki/Main
 316          * - Normalise non-standard title urls:
 317          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 318          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 319          *
 320          * @param Title $title
 321          * @return bool True if a redirect was set.
 322          * @throws HttpError
 323          */
 324         private function tryNormaliseRedirect( Title $title ) {
 325                 $request = $this->context->getRequest();
 326                 $output = $this->context->getOutput();
 327
 328                 if ( $request->getVal( 'action', 'view' ) != 'view'
 329                         || $request->wasPosted()
 330                         || count( $request->getValueNames( [ 'action', 'title' ] ) )
 331                         || !Hooks::run( 'TestCanonicalRedirect', [ $request, $title, $output ] )
 332                 ) {
 333                         return false;
 334                 }
 335
 336                 if ( $title->isSpecialPage() ) {
 337                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 338                         if ( $name ) {
 339                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 340                         }
 341                 }
 342                 // Redirect to canonical url, make it a 301 to allow caching
 343                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 344
 345                 if ( $targetUrl != $request->getFullRequestURL() ) {
 346                         $output->setCdnMaxage( 1200 );
 347                         $output->redirect( $targetUrl, '301' );
 348                         return true;
 349                 }
 350
 351                 // If there is no title, or the title is in a non-standard encoding, we demand
 352                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 353                 // the url is standard, the server is misconfigured.
 354                 if ( $request->getVal( 'title' ) === null
 355                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 356                 ) {
 357                         $message = "Redirect loop detected!\n\n" .
 358                                 "This means the wiki got confused about what page was " .
 359                                 "requested; this sometimes happens when moving a wiki " .
 360                                 "to a new server or changing the server configuration.\n\n";
 361
 362                         if ( $this->config->get( 'UsePathInfo' ) ) {
 363                                 $message .= "The wiki is trying to interpret the page " .
 364                                         "title from the URL path portion (PATH_INFO), which " .
 365                                         "sometimes fails depending on the web server. Try " .
 366                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 367                                         "LocalSettings.php, or check that \$wgArticlePath " .
 368                                         "is correct.";
 369                         } else {
 370                                 $message .= "Your web server was detected as possibly not " .
 371                                         "supporting URL path components (PATH_INFO) correctly; " .
 372                                         "check your LocalSettings.php for a customized " .
 373                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 374                                         "to true.";
 375                         }
 376                         throw new HttpError( 500, $message );
 377                 }
 378                 return false;
 379         }
 380
 381         /**
 382          * Initialize the main Article object for "standard" actions (view, etc)
 383          * Create an Article object for the page, following redirects if needed.
 384          *
 385          * @return Article|string An Article, or a string to redirect to another URL
 386          */
 387         private function initializeArticle() {
 388                 $title = $this->context->getTitle();
 389                 if ( $this->context->canUseWikiPage() ) {
 390                         // Try to use request context wiki page, as there
 391                         // is already data from db saved in per process
 392                         // cache there from this->getAction() call.
 393                         $page = $this->context->getWikiPage();
 394                 } else {
 395                         // This case should not happen, but just in case.
 396                         // @TODO: remove this or use an exception
 397                         $page = WikiPage::factory( $title );
 398                         $this->context->setWikiPage( $page );
 399                         wfWarn( "RequestContext::canUseWikiPage() returned false" );
 400                 }
 401
 402                 // Make GUI wrapper for the WikiPage
 403                 $article = Article::newFromWikiPage( $page, $this->context );
 404
 405                 // Skip some unnecessary code if the content model doesn't support redirects
 406                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 407                         return $article;
 408                 }
 409
 410                 $request = $this->context->getRequest();
 411
 412                 // Namespace might change when using redirects
 413                 // Check for redirects ...
 414                 $action = $request->getVal( 'action', 'view' );
 415                 $file = ( $page instanceof WikiFilePage ) ? $page->getFile() : null;
 416                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 417                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 418                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 419                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 420                         // ... and the article is not a non-redirect image page with associated file
 421                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 422                 ) {
 423                         // Give extensions a change to ignore/handle redirects as needed
 424                         $ignoreRedirect = $target = false;
 425
 426                         Hooks::run( 'InitializeArticleMaybeRedirect',
 427                                 [ &$title, &$request, &$ignoreRedirect, &$target, &$article ] );
 428                         $page = $article->getPage(); // reflect any hook changes
 429
 430                         // Follow redirects only for... redirects.
 431                         // If $target is set, then a hook wanted to redirect.
 432                         if ( !$ignoreRedirect && ( $target || $page->isRedirect() ) ) {
 433                                 // Is the target already set by an extension?
 434                                 $target = $target ? $target : $page->followRedirect();
 435                                 if ( is_string( $target ) ) {
 436                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 437                                                 // we'll need to redirect
 438                                                 return $target;
 439                                         }
 440                                 }
 441                                 if ( is_object( $target ) ) {
 442                                         // Rewrite environment to redirected article
 443                                         $rpage = WikiPage::factory( $target );
 444                                         $rpage->loadPageData();
 445                                         if ( $rpage->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 446                                                 $rarticle = Article::newFromWikiPage( $rpage, $this->context );
 447                                                 $rarticle->setRedirectedFrom( $title );
 448
 449                                                 $article = $rarticle;
 450                                                 $this->context->setTitle( $target );
 451                                                 $this->context->setWikiPage( $article->getPage() );
 452                                         }
 453                                 }
 454                         } else {
 455                                 // Article may have been changed by hook
 456                                 $this->context->setTitle( $article->getTitle() );
 457                                 $this->context->setWikiPage( $article->getPage() );
 458                         }
 459                 }
 460
 461                 return $article;
 462         }
 463
 464         /**
 465          * Perform one of the "standard" actions
 466          *
 467          * @param Page $page
 468          * @param Title $requestTitle The original title, before any redirects were applied
 469          */
 470         private function performAction( Page $page, Title $requestTitle ) {
 471                 $request = $this->context->getRequest();
 472                 $output = $this->context->getOutput();
 473                 $title = $this->context->getTitle();
 474                 $user = $this->context->getUser();
 475
 476                 if ( !Hooks::run( 'MediaWikiPerformAction',
 477                                 [ $output, $page, $title, $user, $request, $this ] )
 478                 ) {
 479                         return;
 480                 }
 481
 482                 $act = $this->getAction();
 483                 $action = Action::factory( $act, $page, $this->context );
 484
 485                 if ( $action instanceof Action ) {
 486                         // Narrow DB query expectations for this HTTP request
 487                         $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 488                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 489                         if ( $request->wasPosted() && !$action->doesWrites() ) {
 490                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 491                                 $request->markAsSafeRequest();
 492                         }
 493
 494                         # Let CDN cache things if we can purge them.
 495                         if ( $this->config->get( 'UseSquid' ) &&
 496                                 in_array(
 497                                         // Use PROTO_INTERNAL because that's what getCdnUrls() uses
 498                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 499                                         $requestTitle->getCdnUrls()
 500                                 )
 501                         ) {
 502                                 $output->setCdnMaxage( $this->config->get( 'SquidMaxage' ) );
 503                         }
 504
 505                         $action->show();
 506                         return;
 507                 }
 508
 509                 if ( Hooks::run( 'UnknownAction', [ $request->getVal( 'action', 'view' ), $page ] ) ) {
 510                         $output->setStatusCode( 404 );
 511                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 512                 }
 513         }
 514
 515         /**
 516          * Run the current MediaWiki instance; index.php just calls this
 517          */
 518         public function run() {
 519                 try {
 520                         try {
 521                                 $this->main();
 522                         } catch ( ErrorPageError $e ) {
 523                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 524                                 // they are not internal application faults. As with normal requests, this
 525                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 526                                 $this->doPreOutputCommit();
 527                                 $e->report(); // display the GUI error
 528                         }
 529                 } catch ( Exception $e ) {
 530                         MWExceptionHandler::handleException( $e );
 531                 }
 532
 533                 $this->doPostOutputShutdown( 'normal' );
 534         }
 535
 536         /**
 537          * @see MediaWiki::preOutputCommit()
 538          * @since 1.26
 539          */
 540         public function doPreOutputCommit() {
 541                 self::preOutputCommit( $this->context );
 542         }
 543
 544         /**
 545          * This function commits all DB changes as needed before
 546          * the user can receive a response (in case commit fails)
 547          *
 548          * @param IContextSource $context
 549          * @since 1.27
 550          */
 551         public static function preOutputCommit( IContextSource $context ) {
 552                 // Either all DBs should commit or none
 553                 ignore_user_abort( true );
 554
 555                 $config = $context->getConfig();
 556
 557                 $factory = wfGetLBFactory();
 558                 // Commit all changes
 559                 $factory->commitMasterChanges(
 560                         __METHOD__,
 561                         // Abort if any transaction was too big
 562                         [ 'maxWriteDuration' => $config->get( 'MaxUserDBWriteDuration' ) ]
 563                 );
 564                 // Record ChronologyProtector positions
 565                 $factory->shutdown();
 566                 wfDebug( __METHOD__ . ': all transactions committed' );
 567
 568                 DeferredUpdates::doUpdates( 'enqueue', DeferredUpdates::PRESEND );
 569                 wfDebug( __METHOD__ . ': pre-send deferred updates completed' );
 570
 571                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the DC that handles this
 572                 // POST request (e.g. the "master" data center). Also have the user briefly bypass CDN so
 573                 // ChronologyProtector works for cacheable URLs.
 574                 $request = $context->getRequest();
 575                 if ( $request->wasPosted() && $factory->hasOrMadeRecentMasterChanges() ) {
 576                         $expires = time() + $config->get( 'DataCenterUpdateStickTTL' );
 577                         $options = [ 'prefix' => '' ];
 578                         $request->response()->setCookie( 'UseDC', 'master', $expires, $options );
 579                         $request->response()->setCookie( 'UseCDNCache', 'false', $expires, $options );
 580                 }
 581
 582                 // Avoid letting a few seconds of slave lag cause a month of stale data. This logic is
 583                 // also intimately related to the value of $wgCdnReboundPurgeDelay.
 584                 if ( $factory->laggedSlaveUsed() ) {
 585                         $maxAge = $config->get( 'CdnMaxageLagged' );
 586                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 587                         $request->response()->header( "X-Database-Lagged: true" );
 588                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 589                 }
 590
 591                 // Avoid long-term cache pollution due to message cache rebuild timeouts (T133069)
 592                 if ( MessageCache::singleton()->isDisabled() ) {
 593                         $maxAge = $config->get( 'CdnMaxageSubstitute' );
 594                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 595                         $request->response()->header( "X-Response-Substitute: true" );
 596                 }
 597         }
 598
 599         /**
 600          * This function does work that can be done *after* the
 601          * user gets the HTTP response so they don't block on it
 602          *
 603          * This manages deferred updates, job insertion,
 604          * final commit, and the logging of profiling data
 605          *
 606          * @param string $mode Use 'fast' to always skip job running
 607          * @since 1.26
 608          */
 609         public function doPostOutputShutdown( $mode = 'normal' ) {
 610                 $timing = $this->context->getTiming();
 611                 $timing->mark( 'requestShutdown' );
 612
 613                 // Show visible profiling data if enabled (which cannot be post-send)
 614                 Profiler::instance()->logDataPageOutputOnly();
 615
 616                 $that = $this;
 617                 $callback = function () use ( $that, $mode ) {
 618                         try {
 619                                 $that->restInPeace( $mode );
 620                         } catch ( Exception $e ) {
 621                                 MWExceptionHandler::handleException( $e );
 622                         }
 623                 };
 624
 625                 // Defer everything else...
 626                 if ( function_exists( 'register_postsend_function' ) ) {
 627                         // https://github.com/facebook/hhvm/issues/1230
 628                         register_postsend_function( $callback );
 629                 } else {
 630                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 631                                 fastcgi_finish_request();
 632                         } else {
 633                                 // Either all DB and deferred updates should happen or none.
 634                                 // The later should not be cancelled due to client disconnect.
 635                                 ignore_user_abort( true );
 636                         }
 637
 638                         $callback();
 639                 }
 640         }
 641
 642         private function main() {
 643                 global $wgTitle;
 644
 645                 $request = $this->context->getRequest();
 646
 647                 // Send Ajax requests to the Ajax dispatcher.
 648                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 649                         // Set a dummy title, because $wgTitle == null might break things
 650                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 651                                 . __METHOD__
 652                         );
 653                         $this->context->setTitle( $title );
 654                         $wgTitle = $title;
 655
 656                         $dispatcher = new AjaxDispatcher( $this->config );
 657                         $dispatcher->performAction( $this->context->getUser() );
 658                         return;
 659                 }
 660
 661                 // Get title from request parameters,
 662                 // is set on the fly by parseTitle the first time.
 663                 $title = $this->getTitle();
 664                 $action = $this->getAction();
 665                 $wgTitle = $title;
 666
 667                 // Set DB query expectations for this HTTP request
 668                 $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 669                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 670                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 671                 if ( $request->hasSafeMethod() ) {
 672                         $trxProfiler->setExpectations( $trxLimits['GET'], __METHOD__ );
 673                 } else {
 674                         $trxProfiler->setExpectations( $trxLimits['POST'], __METHOD__ );
 675                 }
 676
 677                 // If the user has forceHTTPS set to true, or if the user
 678                 // is in a group requiring HTTPS, or if they have the HTTPS
 679                 // preference set, redirect them to HTTPS.
 680                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 681                 // isLoggedIn() will do all sorts of weird stuff.
 682                 if (
 683                         $request->getProtocol() == 'http' &&
 684                         // switch to HTTPS only when supported by the server
 685                         preg_match( '#^https://#', wfExpandUrl( $request->getRequestURL(), PROTO_HTTPS ) ) &&
 686                         (
 687                                 $request->getSession()->shouldForceHTTPS() ||
 688                                 // Check the cookie manually, for paranoia
 689                                 $request->getCookie( 'forceHTTPS', '' ) ||
 690                                 // check for prefixed version that was used for a time in older MW versions
 691                                 $request->getCookie( 'forceHTTPS' ) ||
 692                                 // Avoid checking the user and groups unless it's enabled.
 693                                 (
 694                                         $this->context->getUser()->isLoggedIn()
 695                                         && $this->context->getUser()->requiresHTTPS()
 696                                 )
 697                         )
 698                 ) {
 699                         $oldUrl = $request->getFullRequestURL();
 700                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 701
 702                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 703                         if ( Hooks::run( 'BeforeHttpsRedirect', [ $this->context, &$redirUrl ] ) ) {
 704
 705                                 if ( $request->wasPosted() ) {
 706                                         // This is weird and we'd hope it almost never happens. This
 707                                         // means that a POST came in via HTTP and policy requires us
 708                                         // redirecting to HTTPS. It's likely such a request is going
 709                                         // to fail due to post data being lost, but let's try anyway
 710                                         // and just log the instance.
 711
 712                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 713                                         // to see how clients (automated & browser) behave when we do
 714                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 715                                 }
 716                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 717                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 718                                 $this->context->setTitle( $title );
 719                                 $output = $this->context->getOutput();
 720                                 // Since we only do this redir to change proto, always send a vary header
 721                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 722                                 $output->redirect( $redirUrl );
 723                                 $output->output();
 724                                 return;
 725                         }
 726                 }
 727
 728                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 729                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 730                                 // Try low-level file cache hit
 731                                 $cache = new HTMLFileCache( $title, $action );
 732                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 733                                         // Check incoming headers to see if client has this cached
 734                                         $timestamp = $cache->cacheTimestamp();
 735                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 736                                                 $cache->loadFromFileCache( $this->context );
 737                                         }
 738                                         // Do any stats increment/watchlist stuff
 739                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 740                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 741                                         // Tell OutputPage that output is taken care of
 742                                         $this->context->getOutput()->disable();
 743                                         return;
 744                                 }
 745                         }
 746                 }
 747
 748                 // Actually do the work of the request and build up any output
 749                 $this->performRequest();
 750
 751                 // Now commit any transactions, so that unreported errors after
 752                 // output() don't roll back the whole DB transaction and so that
 753                 // we avoid having both success and error text in the response
 754                 $this->doPreOutputCommit();
 755
 756                 // Output everything!
 757                 $this->context->getOutput()->output();
 758         }
 759
 760         /**
 761          * Ends this task peacefully
 762          * @param string $mode Use 'fast' to always skip job running
 763          */
 764         public function restInPeace( $mode = 'fast' ) {
 765                 $factory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 766                 // Assure deferred updates are not in the main transaction
 767                 $factory->commitMasterChanges( __METHOD__ );
 768
 769                 // Loosen DB query expectations since the HTTP client is unblocked
 770                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 771                 $trxProfiler->resetExpectations();
 772                 $trxProfiler->setExpectations(
 773                         $this->config->get( 'TrxProfilerLimits' )['PostSend'],
 774                         __METHOD__
 775                 );
 776
 777                 // Do any deferred jobs
 778                 DeferredUpdates::doUpdates( 'enqueue' );
 779
 780                 // Make sure any lazy jobs are pushed
 781                 JobQueueGroup::pushLazyJobs();
 782
 783                 // Now that everything specific to this request is done,
 784                 // try to occasionally run jobs (if enabled) from the queues
 785                 if ( $mode === 'normal' ) {
 786                         $this->triggerJobs();
 787                 }
 788
 789                 // Log profiling data, e.g. in the database or UDP
 790                 wfLogProfilingData();
 791
 792                 // Commit and close up!
 793                 $factory->commitMasterChanges( __METHOD__ );
 794                 $factory->shutdown( LBFactory::SHUTDOWN_NO_CHRONPROT );
 795
 796                 wfDebug( "Request ended normally\n" );
 797         }
 798
 799         /**
 800          * Potentially open a socket and sent an HTTP request back to the server
 801          * to run a specified number of jobs. This registers a callback to cleanup
 802          * the socket once it's done.
 803          */
 804         public function triggerJobs() {
 805                 $jobRunRate = $this->config->get( 'JobRunRate' );
 806                 if ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 807                         return; // recursion guard
 808                 } elseif ( $jobRunRate <= 0 || wfReadOnly() ) {
 809                         return;
 810                 }
 811
 812                 if ( $jobRunRate < 1 ) {
 813                         $max = mt_getrandmax();
 814                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 815                                 return; // the higher the job run rate, the less likely we return here
 816                         }
 817                         $n = 1;
 818                 } else {
 819                         $n = intval( $jobRunRate );
 820                 }
 821
 822                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 823
 824                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 825                         // Fall back to running the job here while the user waits
 826                         $runner = new JobRunner( $runJobsLogger );
 827                         $runner->run( [ 'maxJobs'  => $n ] );
 828                         return;
 829                 }
 830
 831                 try {
 832                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 833                                 return; // do not send request if there are probably no jobs
 834                         }
 835                 } catch ( JobQueueError $e ) {
 836                         MWExceptionHandler::logException( $e );
 837                         return; // do not make the site unavailable
 838                 }
 839
 840                 $query = [ 'title' => 'Special:RunJobs',
 841                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 ];
 842                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 843                         $query, $this->config->get( 'SecretKey' ) );
 844
 845                 $errno = $errstr = null;
 846                 $info = wfParseUrl( $this->config->get( 'CanonicalServer' ) );
 847                 MediaWiki\suppressWarnings();
 848                 $host = $info['host'];
 849                 $port = 80;
 850                 if ( isset( $info['scheme'] ) && $info['scheme'] == 'https' ) {
 851                         $host = "tls://" . $host;
 852                         $port = 443;
 853                 }
 854                 if ( isset( $info['port'] ) ) {
 855                         $port = $info['port'];
 856                 }
 857                 $sock = fsockopen(
 858                         $host,
 859                         $port,
 860                         $errno,
 861                         $errstr,
 862                         // If it takes more than 100ms to connect to ourselves there
 863                         // is a problem elsewhere.
 864                         0.1
 865                 );
 866                 MediaWiki\restoreWarnings();
 867                 if ( !$sock ) {
 868                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 869                         // Fall back to running the job here while the user waits
 870                         $runner = new JobRunner( $runJobsLogger );
 871                         $runner->run( [ 'maxJobs'  => $n ] );
 872                         return;
 873                 }
 874
 875                 $special = SpecialPageFactory::getPage( 'RunJobs' );
 876                 $url = $special->getPageTitle()->getCanonicalURL( $query );
 877                 $req = (
 878                         "POST $url HTTP/1.1\r\n" .
 879                         "Host: {$info['host']}\r\n" .
 880                         "Connection: Close\r\n" .
 881                         "Content-Length: 0\r\n\r\n"
 882                 );
 883
 884                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 885                 // Send a cron API request to be performed in the background.
 886                 // Give up if this takes too long to send (which should be rare).
 887                 stream_set_timeout( $sock, 2 );
 888                 $bytes = fwrite( $sock, $req );
 889                 if ( $bytes !== strlen( $req ) ) {
 890                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 891                 } else {
 892                         // Do not wait for the response (the script should handle client aborts).
 893                         // Make sure that we don't close before that script reaches ignore_user_abort().
 894                         $status = fgets( $sock );
 895                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 896                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 897                         }
 898                 }
 899                 fclose( $sock );
 900         }
 901 }