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                                         $url = $request->getFullRequestURL(); // requested URL
 290                                         if (
 291                                                 $request->getMethod() === 'GET' &&
 292                                                 $url === $article->getTitle()->getCanonicalURL() &&
 293                                                 $article->checkTouched() &&
 294                                                 $output->checkLastModified( $article->getTouched() )
 295                                         ) {
 296                                                 wfDebug( __METHOD__ . ": done 304\n" );
 297                                                 return;
 298                                         }
 299                                         $this->performAction( $article, $requestTitle );
 300                                 } elseif ( is_string( $article ) ) {
 301                                         $output->redirect( $article );
 302                                 } else {
 303                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 304                                                 . " returned neither an object nor a URL" );
 305                                 }
 306                         }
 307                 }
 308         }
 309
 310         /**
 311          * Handle redirects for uncanonical title requests.
 312          *
 313          * Handles:
 314          * - Redirect loops.
 315          * - No title in URL.
 316          * - $wgUsePathInfo URLs.
 317          * - URLs with a variant.
 318          * - Other non-standard URLs (as long as they have no extra query parameters).
 319          *
 320          * Behaviour:
 321          * - Normalise title values:
 322          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 323          * - Normalise empty title:
 324          *   /wiki/ -> /wiki/Main
 325          *   /w/index.php?title= -> /wiki/Main
 326          * - Normalise non-standard title urls:
 327          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 328          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 329          *
 330          * @param Title $title
 331          * @return bool True if a redirect was set.
 332          * @throws HttpError
 333          */
 334         private function tryNormaliseRedirect( Title $title ) {
 335                 $request = $this->context->getRequest();
 336                 $output = $this->context->getOutput();
 337
 338                 if ( $request->getVal( 'action', 'view' ) != 'view'
 339                         || $request->wasPosted()
 340                         || count( $request->getValueNames( [ 'action', 'title' ] ) )
 341                         || !Hooks::run( 'TestCanonicalRedirect', [ $request, $title, $output ] )
 342                 ) {
 343                         return false;
 344                 }
 345
 346                 if ( $title->isSpecialPage() ) {
 347                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 348                         if ( $name ) {
 349                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 350                         }
 351                 }
 352                 // Redirect to canonical url, make it a 301 to allow caching
 353                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 354
 355                 if ( $targetUrl != $request->getFullRequestURL() ) {
 356                         $output->setCdnMaxage( 1200 );
 357                         $output->redirect( $targetUrl, '301' );
 358                         return true;
 359                 }
 360
 361                 // If there is no title, or the title is in a non-standard encoding, we demand
 362                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 363                 // the url is standard, the server is misconfigured.
 364                 if ( $request->getVal( 'title' ) === null
 365                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 366                 ) {
 367                         $message = "Redirect loop detected!\n\n" .
 368                                 "This means the wiki got confused about what page was " .
 369                                 "requested; this sometimes happens when moving a wiki " .
 370                                 "to a new server or changing the server configuration.\n\n";
 371
 372                         if ( $this->config->get( 'UsePathInfo' ) ) {
 373                                 $message .= "The wiki is trying to interpret the page " .
 374                                         "title from the URL path portion (PATH_INFO), which " .
 375                                         "sometimes fails depending on the web server. Try " .
 376                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 377                                         "LocalSettings.php, or check that \$wgArticlePath " .
 378                                         "is correct.";
 379                         } else {
 380                                 $message .= "Your web server was detected as possibly not " .
 381                                         "supporting URL path components (PATH_INFO) correctly; " .
 382                                         "check your LocalSettings.php for a customized " .
 383                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 384                                         "to true.";
 385                         }
 386                         throw new HttpError( 500, $message );
 387                 }
 388                 return false;
 389         }
 390
 391         /**
 392          * Initialize the main Article object for "standard" actions (view, etc)
 393          * Create an Article object for the page, following redirects if needed.
 394          *
 395          * @return Article|string An Article, or a string to redirect to another URL
 396          */
 397         private function initializeArticle() {
 398                 $title = $this->context->getTitle();
 399                 if ( $this->context->canUseWikiPage() ) {
 400                         // Try to use request context wiki page, as there
 401                         // is already data from db saved in per process
 402                         // cache there from this->getAction() call.
 403                         $page = $this->context->getWikiPage();
 404                 } else {
 405                         // This case should not happen, but just in case.
 406                         // @TODO: remove this or use an exception
 407                         $page = WikiPage::factory( $title );
 408                         $this->context->setWikiPage( $page );
 409                         wfWarn( "RequestContext::canUseWikiPage() returned false" );
 410                 }
 411
 412                 // Make GUI wrapper for the WikiPage
 413                 $article = Article::newFromWikiPage( $page, $this->context );
 414
 415                 // Skip some unnecessary code if the content model doesn't support redirects
 416                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 417                         return $article;
 418                 }
 419
 420                 $request = $this->context->getRequest();
 421
 422                 // Namespace might change when using redirects
 423                 // Check for redirects ...
 424                 $action = $request->getVal( 'action', 'view' );
 425                 $file = ( $page instanceof WikiFilePage ) ? $page->getFile() : null;
 426                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 427                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 428                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 429                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 430                         // ... and the article is not a non-redirect image page with associated file
 431                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 432                 ) {
 433                         // Give extensions a change to ignore/handle redirects as needed
 434                         $ignoreRedirect = $target = false;
 435
 436                         Hooks::run( 'InitializeArticleMaybeRedirect',
 437                                 [ &$title, &$request, &$ignoreRedirect, &$target, &$article ] );
 438                         $page = $article->getPage(); // reflect any hook changes
 439
 440                         // Follow redirects only for... redirects.
 441                         // If $target is set, then a hook wanted to redirect.
 442                         if ( !$ignoreRedirect && ( $target || $page->isRedirect() ) ) {
 443                                 // Is the target already set by an extension?
 444                                 $target = $target ? $target : $page->followRedirect();
 445                                 if ( is_string( $target ) ) {
 446                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 447                                                 // we'll need to redirect
 448                                                 return $target;
 449                                         }
 450                                 }
 451                                 if ( is_object( $target ) ) {
 452                                         // Rewrite environment to redirected article
 453                                         $rpage = WikiPage::factory( $target );
 454                                         $rpage->loadPageData();
 455                                         if ( $rpage->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 456                                                 $rarticle = Article::newFromWikiPage( $rpage, $this->context );
 457                                                 $rarticle->setRedirectedFrom( $title );
 458
 459                                                 $article = $rarticle;
 460                                                 $this->context->setTitle( $target );
 461                                                 $this->context->setWikiPage( $article->getPage() );
 462                                         }
 463                                 }
 464                         } else {
 465                                 // Article may have been changed by hook
 466                                 $this->context->setTitle( $article->getTitle() );
 467                                 $this->context->setWikiPage( $article->getPage() );
 468                         }
 469                 }
 470
 471                 return $article;
 472         }
 473
 474         /**
 475          * Perform one of the "standard" actions
 476          *
 477          * @param Page $page
 478          * @param Title $requestTitle The original title, before any redirects were applied
 479          */
 480         private function performAction( Page $page, Title $requestTitle ) {
 481                 $request = $this->context->getRequest();
 482                 $output = $this->context->getOutput();
 483                 $title = $this->context->getTitle();
 484                 $user = $this->context->getUser();
 485
 486                 if ( !Hooks::run( 'MediaWikiPerformAction',
 487                                 [ $output, $page, $title, $user, $request, $this ] )
 488                 ) {
 489                         return;
 490                 }
 491
 492                 $act = $this->getAction();
 493                 $action = Action::factory( $act, $page, $this->context );
 494
 495                 if ( $action instanceof Action ) {
 496                         // Narrow DB query expectations for this HTTP request
 497                         $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 498                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 499                         if ( $request->wasPosted() && !$action->doesWrites() ) {
 500                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 501                                 $request->markAsSafeRequest();
 502                         }
 503
 504                         # Let CDN cache things if we can purge them.
 505                         if ( $this->config->get( 'UseSquid' ) &&
 506                                 in_array(
 507                                         // Use PROTO_INTERNAL because that's what getCdnUrls() uses
 508                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 509                                         $requestTitle->getCdnUrls()
 510                                 )
 511                         ) {
 512                                 $output->setCdnMaxage( $this->config->get( 'SquidMaxage' ) );
 513                         }
 514
 515                         $action->show();
 516                         return;
 517                 }
 518
 519                 if ( Hooks::run( 'UnknownAction', [ $request->getVal( 'action', 'view' ), $page ] ) ) {
 520                         $output->setStatusCode( 404 );
 521                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 522                 }
 523         }
 524
 525         /**
 526          * Run the current MediaWiki instance; index.php just calls this
 527          */
 528         public function run() {
 529                 try {
 530                         try {
 531                                 $this->main();
 532                         } catch ( ErrorPageError $e ) {
 533                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 534                                 // they are not internal application faults. As with normal requests, this
 535                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 536                                 $this->doPreOutputCommit();
 537                                 $e->report(); // display the GUI error
 538                         }
 539                 } catch ( Exception $e ) {
 540                         MWExceptionHandler::handleException( $e );
 541                 }
 542
 543                 $this->doPostOutputShutdown( 'normal' );
 544         }
 545
 546         /**
 547          * @see MediaWiki::preOutputCommit()
 548          * @since 1.26
 549          */
 550         public function doPreOutputCommit() {
 551                 self::preOutputCommit( $this->context );
 552         }
 553
 554         /**
 555          * This function commits all DB changes as needed before
 556          * the user can receive a response (in case commit fails)
 557          *
 558          * @param IContextSource $context
 559          * @since 1.27
 560          */
 561         public static function preOutputCommit( IContextSource $context ) {
 562                 // Either all DBs should commit or none
 563                 ignore_user_abort( true );
 564
 565                 $config = $context->getConfig();
 566
 567                 $factory = wfGetLBFactory();
 568                 // Commit all changes
 569                 $factory->commitMasterChanges(
 570                         __METHOD__,
 571                         // Abort if any transaction was too big
 572                         [ 'maxWriteDuration' => $config->get( 'MaxUserDBWriteDuration' ) ]
 573                 );
 574                 // Record ChronologyProtector positions
 575                 $factory->shutdown();
 576                 wfDebug( __METHOD__ . ': all transactions committed' );
 577
 578                 DeferredUpdates::doUpdates( 'enqueue', DeferredUpdates::PRESEND );
 579                 wfDebug( __METHOD__ . ': pre-send deferred updates completed' );
 580
 581                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the DC that handles this
 582                 // POST request (e.g. the "master" data center). Also have the user briefly bypass CDN so
 583                 // ChronologyProtector works for cacheable URLs.
 584                 $request = $context->getRequest();
 585                 if ( $request->wasPosted() && $factory->hasOrMadeRecentMasterChanges() ) {
 586                         $expires = time() + $config->get( 'DataCenterUpdateStickTTL' );
 587                         $options = [ 'prefix' => '' ];
 588                         $request->response()->setCookie( 'UseDC', 'master', $expires, $options );
 589                         $request->response()->setCookie( 'UseCDNCache', 'false', $expires, $options );
 590                 }
 591
 592                 // Avoid letting a few seconds of slave lag cause a month of stale data. This logic is
 593                 // also intimately related to the value of $wgCdnReboundPurgeDelay.
 594                 if ( $factory->laggedSlaveUsed() ) {
 595                         $maxAge = $config->get( 'CdnMaxageLagged' );
 596                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 597                         $request->response()->header( "X-Database-Lagged: true" );
 598                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 599                 }
 600
 601                 // Avoid long-term cache pollution due to message cache rebuild timeouts (T133069)
 602                 if ( MessageCache::singleton()->isDisabled() ) {
 603                         $maxAge = $config->get( 'CdnMaxageSubstitute' );
 604                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 605                         $request->response()->header( "X-Response-Substitute: true" );
 606                 }
 607         }
 608
 609         /**
 610          * This function does work that can be done *after* the
 611          * user gets the HTTP response so they don't block on it
 612          *
 613          * This manages deferred updates, job insertion,
 614          * final commit, and the logging of profiling data
 615          *
 616          * @param string $mode Use 'fast' to always skip job running
 617          * @since 1.26
 618          */
 619         public function doPostOutputShutdown( $mode = 'normal' ) {
 620                 $timing = $this->context->getTiming();
 621                 $timing->mark( 'requestShutdown' );
 622
 623                 // Show visible profiling data if enabled (which cannot be post-send)
 624                 Profiler::instance()->logDataPageOutputOnly();
 625
 626                 $that = $this;
 627                 $callback = function () use ( $that, $mode ) {
 628                         try {
 629                                 $that->restInPeace( $mode );
 630                         } catch ( Exception $e ) {
 631                                 MWExceptionHandler::handleException( $e );
 632                         }
 633                 };
 634
 635                 // Defer everything else...
 636                 if ( function_exists( 'register_postsend_function' ) ) {
 637                         // https://github.com/facebook/hhvm/issues/1230
 638                         register_postsend_function( $callback );
 639                 } else {
 640                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 641                                 fastcgi_finish_request();
 642                         } else {
 643                                 // Either all DB and deferred updates should happen or none.
 644                                 // The later should not be cancelled due to client disconnect.
 645                                 ignore_user_abort( true );
 646                         }
 647
 648                         $callback();
 649                 }
 650         }
 651
 652         private function main() {
 653                 global $wgTitle;
 654
 655                 $request = $this->context->getRequest();
 656
 657                 // Send Ajax requests to the Ajax dispatcher.
 658                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 659                         // Set a dummy title, because $wgTitle == null might break things
 660                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 661                                 . __METHOD__
 662                         );
 663                         $this->context->setTitle( $title );
 664                         $wgTitle = $title;
 665
 666                         $dispatcher = new AjaxDispatcher( $this->config );
 667                         $dispatcher->performAction( $this->context->getUser() );
 668                         return;
 669                 }
 670
 671                 // Get title from request parameters,
 672                 // is set on the fly by parseTitle the first time.
 673                 $title = $this->getTitle();
 674                 $action = $this->getAction();
 675                 $wgTitle = $title;
 676
 677                 // Set DB query expectations for this HTTP request
 678                 $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 679                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 680                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 681                 if ( $request->hasSafeMethod() ) {
 682                         $trxProfiler->setExpectations( $trxLimits['GET'], __METHOD__ );
 683                 } else {
 684                         $trxProfiler->setExpectations( $trxLimits['POST'], __METHOD__ );
 685                 }
 686
 687                 // If the user has forceHTTPS set to true, or if the user
 688                 // is in a group requiring HTTPS, or if they have the HTTPS
 689                 // preference set, redirect them to HTTPS.
 690                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 691                 // isLoggedIn() will do all sorts of weird stuff.
 692                 if (
 693                         $request->getProtocol() == 'http' &&
 694                         // switch to HTTPS only when supported by the server
 695                         preg_match( '#^https://#', wfExpandUrl( $request->getRequestURL(), PROTO_HTTPS ) ) &&
 696                         (
 697                                 $request->getSession()->shouldForceHTTPS() ||
 698                                 // Check the cookie manually, for paranoia
 699                                 $request->getCookie( 'forceHTTPS', '' ) ||
 700                                 // check for prefixed version that was used for a time in older MW versions
 701                                 $request->getCookie( 'forceHTTPS' ) ||
 702                                 // Avoid checking the user and groups unless it's enabled.
 703                                 (
 704                                         $this->context->getUser()->isLoggedIn()
 705                                         && $this->context->getUser()->requiresHTTPS()
 706                                 )
 707                         )
 708                 ) {
 709                         $oldUrl = $request->getFullRequestURL();
 710                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 711
 712                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 713                         if ( Hooks::run( 'BeforeHttpsRedirect', [ $this->context, &$redirUrl ] ) ) {
 714
 715                                 if ( $request->wasPosted() ) {
 716                                         // This is weird and we'd hope it almost never happens. This
 717                                         // means that a POST came in via HTTP and policy requires us
 718                                         // redirecting to HTTPS. It's likely such a request is going
 719                                         // to fail due to post data being lost, but let's try anyway
 720                                         // and just log the instance.
 721
 722                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 723                                         // to see how clients (automated & browser) behave when we do
 724                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 725                                 }
 726                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 727                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 728                                 $this->context->setTitle( $title );
 729                                 $output = $this->context->getOutput();
 730                                 // Since we only do this redir to change proto, always send a vary header
 731                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 732                                 $output->redirect( $redirUrl );
 733                                 $output->output();
 734                                 return;
 735                         }
 736                 }
 737
 738                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 739                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 740                                 // Try low-level file cache hit
 741                                 $cache = new HTMLFileCache( $title, $action );
 742                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 743                                         // Check incoming headers to see if client has this cached
 744                                         $timestamp = $cache->cacheTimestamp();
 745                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 746                                                 $cache->loadFromFileCache( $this->context );
 747                                         }
 748                                         // Do any stats increment/watchlist stuff
 749                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 750                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 751                                         // Tell OutputPage that output is taken care of
 752                                         $this->context->getOutput()->disable();
 753                                         return;
 754                                 }
 755                         }
 756                 }
 757
 758                 // Actually do the work of the request and build up any output
 759                 $this->performRequest();
 760
 761                 // Now commit any transactions, so that unreported errors after
 762                 // output() don't roll back the whole DB transaction and so that
 763                 // we avoid having both success and error text in the response
 764                 $this->doPreOutputCommit();
 765
 766                 // Output everything!
 767                 $this->context->getOutput()->output();
 768         }
 769
 770         /**
 771          * Ends this task peacefully
 772          * @param string $mode Use 'fast' to always skip job running
 773          */
 774         public function restInPeace( $mode = 'fast' ) {
 775                 $factory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 776                 // Assure deferred updates are not in the main transaction
 777                 $factory->commitMasterChanges( __METHOD__ );
 778
 779                 // Loosen DB query expectations since the HTTP client is unblocked
 780                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 781                 $trxProfiler->resetExpectations();
 782                 $trxProfiler->setExpectations(
 783                         $this->config->get( 'TrxProfilerLimits' )['PostSend'],
 784                         __METHOD__
 785                 );
 786
 787                 // Do any deferred jobs
 788                 DeferredUpdates::doUpdates( 'enqueue' );
 789
 790                 // Make sure any lazy jobs are pushed
 791                 JobQueueGroup::pushLazyJobs();
 792
 793                 // Now that everything specific to this request is done,
 794                 // try to occasionally run jobs (if enabled) from the queues
 795                 if ( $mode === 'normal' ) {
 796                         $this->triggerJobs();
 797                 }
 798
 799                 // Log profiling data, e.g. in the database or UDP
 800                 wfLogProfilingData();
 801
 802                 // Commit and close up!
 803                 $factory->commitMasterChanges( __METHOD__ );
 804                 $factory->shutdown( LBFactory::SHUTDOWN_NO_CHRONPROT );
 805
 806                 wfDebug( "Request ended normally\n" );
 807         }
 808
 809         /**
 810          * Potentially open a socket and sent an HTTP request back to the server
 811          * to run a specified number of jobs. This registers a callback to cleanup
 812          * the socket once it's done.
 813          */
 814         public function triggerJobs() {
 815                 $jobRunRate = $this->config->get( 'JobRunRate' );
 816                 if ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 817                         return; // recursion guard
 818                 } elseif ( $jobRunRate <= 0 || wfReadOnly() ) {
 819                         return;
 820                 }
 821
 822                 if ( $jobRunRate < 1 ) {
 823                         $max = mt_getrandmax();
 824                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 825                                 return; // the higher the job run rate, the less likely we return here
 826                         }
 827                         $n = 1;
 828                 } else {
 829                         $n = intval( $jobRunRate );
 830                 }
 831
 832                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 833
 834                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 835                         // Fall back to running the job here while the user waits
 836                         $runner = new JobRunner( $runJobsLogger );
 837                         $runner->run( [ 'maxJobs'  => $n ] );
 838                         return;
 839                 }
 840
 841                 try {
 842                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 843                                 return; // do not send request if there are probably no jobs
 844                         }
 845                 } catch ( JobQueueError $e ) {
 846                         MWExceptionHandler::logException( $e );
 847                         return; // do not make the site unavailable
 848                 }
 849
 850                 $query = [ 'title' => 'Special:RunJobs',
 851                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 ];
 852                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 853                         $query, $this->config->get( 'SecretKey' ) );
 854
 855                 $errno = $errstr = null;
 856                 $info = wfParseUrl( $this->config->get( 'CanonicalServer' ) );
 857                 MediaWiki\suppressWarnings();
 858                 $host = $info['host'];
 859                 $port = 80;
 860                 if ( isset( $info['scheme'] ) && $info['scheme'] == 'https' ) {
 861                         $host = "tls://" . $host;
 862                         $port = 443;
 863                 }
 864                 if ( isset( $info['port'] ) ) {
 865                         $port = $info['port'];
 866                 }
 867                 $sock = fsockopen(
 868                         $host,
 869                         $port,
 870                         $errno,
 871                         $errstr,
 872                         // If it takes more than 100ms to connect to ourselves there
 873                         // is a problem elsewhere.
 874                         0.1
 875                 );
 876                 MediaWiki\restoreWarnings();
 877                 if ( !$sock ) {
 878                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 879                         // Fall back to running the job here while the user waits
 880                         $runner = new JobRunner( $runJobsLogger );
 881                         $runner->run( [ 'maxJobs'  => $n ] );
 882                         return;
 883                 }
 884
 885                 $special = SpecialPageFactory::getPage( 'RunJobs' );
 886                 $url = $special->getPageTitle()->getCanonicalURL( $query );
 887                 $req = (
 888                         "POST $url HTTP/1.1\r\n" .
 889                         "Host: {$info['host']}\r\n" .
 890                         "Connection: Close\r\n" .
 891                         "Content-Length: 0\r\n\r\n"
 892                 );
 893
 894                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 895                 // Send a cron API request to be performed in the background.
 896                 // Give up if this takes too long to send (which should be rare).
 897                 stream_set_timeout( $sock, 2 );
 898                 $bytes = fwrite( $sock, $req );
 899                 if ( $bytes !== strlen( $req ) ) {
 900                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 901                 } else {
 902                         // Do not wait for the response (the script should handle client aborts).
 903                         // Make sure that we don't close before that script reaches ignore_user_abort().
 904                         $status = fgets( $sock );
 905                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 906                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 907                         }
 908                 }
 909                 fclose( $sock );
 910         }
 911 }