includes/MediaWiki.php

   1 <?php
   2 /**
   3  * Helper class for the index.php entry point.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * The MediaWiki class is the helper class for the index.php entry point.
  27  */
  28 class MediaWiki {
  29         /**
  30          * @var IContextSource
  31          */
  32         private $context;
  33
  34         /**
  35          * @var Config
  36          */
  37         private $config;
  38
  39         /**
  40          * @param IContextSource|null $context
  41          */
  42         public function __construct( IContextSource $context = null ) {
  43                 if ( !$context ) {
  44                         $context = RequestContext::getMain();
  45                 }
  46
  47                 $this->context = $context;
  48                 $this->config = $context->getConfig();
  49         }
  50
  51         /**
  52          * Parse the request to get the Title object
  53          *
  54          * @throws MalformedTitleException If a title has been provided by the user, but is invalid.
  55          * @return Title Title object to be $wgTitle
  56          */
  57         private function parseTitle() {
  58                 global $wgContLang;
  59
  60                 $request = $this->context->getRequest();
  61                 $curid = $request->getInt( 'curid' );
  62                 $title = $request->getVal( 'title' );
  63                 $action = $request->getVal( 'action' );
  64
  65                 if ( $request->getCheck( 'search' ) ) {
  66                         // Compatibility with old search URLs which didn't use Special:Search
  67                         // Just check for presence here, so blank requests still
  68                         // show the search page when using ugly URLs (bug 8054).
  69                         $ret = SpecialPage::getTitleFor( 'Search' );
  70                 } elseif ( $curid ) {
  71                         // URLs like this are generated by RC, because rc_title isn't always accurate
  72                         $ret = Title::newFromID( $curid );
  73                 } else {
  74                         $ret = Title::newFromURL( $title );
  75                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  76                         // in wikitext links to tell Parser to make a direct file link
  77                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  78                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  79                         }
  80                         // Check variant links so that interwiki links don't have to worry
  81                         // about the possible different language variants
  82                         if ( count( $wgContLang->getVariants() ) > 1
  83                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  84                         ) {
  85                                 $wgContLang->findVariantLink( $title, $ret );
  86                         }
  87                 }
  88
  89                 // If title is not provided, always allow oldid and diff to set the title.
  90                 // If title is provided, allow oldid and diff to override the title, unless
  91                 // we are talking about a special page which might use these parameters for
  92                 // other purposes.
  93                 if ( $ret === null || !$ret->isSpecialPage() ) {
  94                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
  95                         $oldid = $request->getInt( 'oldid' );
  96                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
  97                         // Allow oldid to override a changed or missing title
  98                         if ( $oldid ) {
  99                                 $rev = Revision::newFromId( $oldid );
 100                                 $ret = $rev ? $rev->getTitle() : $ret;
 101                         }
 102                 }
 103
 104                 // Use the main page as default title if nothing else has been provided
 105                 if ( $ret === null
 106                         && strval( $title ) === ''
 107                         && !$request->getCheck( 'curid' )
 108                         && $action !== 'delete'
 109                 ) {
 110                         $ret = Title::newMainPage();
 111                 }
 112
 113                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 114                         // If we get here, we definitely don't have a valid title; throw an exception.
 115                         // Try to get detailed invalid title exception first, fall back to MalformedTitleException.
 116                         Title::newFromTextThrow( $title );
 117                         throw new MalformedTitleException( 'badtitletext', $title );
 118                 }
 119
 120                 return $ret;
 121         }
 122
 123         /**
 124          * Get the Title object that we'll be acting on, as specified in the WebRequest
 125          * @return Title
 126          */
 127         public function getTitle() {
 128                 if ( !$this->context->hasTitle() ) {
 129                         try {
 130                                 $this->context->setTitle( $this->parseTitle() );
 131                         } catch ( MalformedTitleException $ex ) {
 132                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 133                         }
 134                 }
 135                 return $this->context->getTitle();
 136         }
 137
 138         /**
 139          * Returns the name of the action that will be executed.
 140          *
 141          * @return string Action
 142          */
 143         public function getAction() {
 144                 static $action = null;
 145
 146                 if ( $action === null ) {
 147                         $action = Action::getActionName( $this->context );
 148                 }
 149
 150                 return $action;
 151         }
 152
 153         /**
 154          * Performs the request.
 155          * - bad titles
 156          * - read restriction
 157          * - local interwiki redirects
 158          * - redirect loop
 159          * - special pages
 160          * - normal pages
 161          *
 162          * @throws MWException|PermissionsError|BadTitleError|HttpError
 163          * @return void
 164          */
 165         private function performRequest() {
 166                 global $wgTitle;
 167
 168                 $request = $this->context->getRequest();
 169                 $requestTitle = $title = $this->context->getTitle();
 170                 $output = $this->context->getOutput();
 171                 $user = $this->context->getUser();
 172
 173                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 174                         $output->setPrintable();
 175                 }
 176
 177                 $unused = null; // To pass it by reference
 178                 Hooks::run( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 179
 180                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 181                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 182                         || $title->isSpecial( 'Badtitle' )
 183                 ) {
 184                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 185                         try {
 186                                 $this->parseTitle();
 187                         } catch ( MalformedTitleException $ex ) {
 188                                 throw new BadTitleError( $ex );
 189                         }
 190                         throw new BadTitleError();
 191                 }
 192
 193                 // Check user's permissions to read this page.
 194                 // We have to check here to catch special pages etc.
 195                 // We will check again in Article::view().
 196                 $permErrors = $title->isSpecial( 'RunJobs' )
 197                         ? array() // relies on HMAC key signature alone
 198                         : $title->getUserPermissionsErrors( 'read', $user );
 199                 if ( count( $permErrors ) ) {
 200                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 201                         // $this->context->title set to the input title would allow anonymous users to
 202                         // determine whether a page exists, potentially leaking private data. In fact, the
 203                         // curid and oldid request  parameters would allow page titles to be enumerated even
 204                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 205                         // permissions error is displayed.
 206
 207                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 208                         // still use $wgTitle.
 209                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 210                         $this->context->setTitle( $badTitle );
 211                         $wgTitle = $badTitle;
 212
 213                         throw new PermissionsError( 'read', $permErrors );
 214                 }
 215
 216                 // Interwiki redirects
 217                 if ( $title->isExternal() ) {
 218                         $rdfrom = $request->getVal( 'rdfrom' );
 219                         if ( $rdfrom ) {
 220                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 221                         } else {
 222                                 $query = $request->getValues();
 223                                 unset( $query['title'] );
 224                                 $url = $title->getFullURL( $query );
 225                         }
 226                         // Check for a redirect loop
 227                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 228                                 && $title->isLocal()
 229                         ) {
 230                                 // 301 so google et al report the target as the actual url.
 231                                 $output->redirect( $url, 301 );
 232                         } else {
 233                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 234                                 try {
 235                                         $this->parseTitle();
 236                                 } catch ( MalformedTitleException $ex ) {
 237                                         throw new BadTitleError( $ex );
 238                                 }
 239                                 throw new BadTitleError();
 240                         }
 241                 // Handle any other redirects.
 242                 // Redirect loops, titleless URL, $wgUsePathInfo URLs, and URLs with a variant
 243                 } elseif ( !$this->tryNormaliseRedirect( $title ) ) {
 244
 245                         // Special pages
 246                         if ( NS_SPECIAL == $title->getNamespace() ) {
 247                                 // Actions that need to be made when we have a special pages
 248                                 SpecialPageFactory::executePath( $title, $this->context );
 249                         } else {
 250                                 // ...otherwise treat it as an article view. The article
 251                                 // may still be a wikipage redirect to another article or URL.
 252                                 $article = $this->initializeArticle();
 253                                 if ( is_object( $article ) ) {
 254                                         $this->performAction( $article, $requestTitle );
 255                                 } elseif ( is_string( $article ) ) {
 256                                         $output->redirect( $article );
 257                                 } else {
 258                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 259                                                 . " returned neither an object nor a URL" );
 260                                 }
 261                         }
 262                 }
 263         }
 264
 265         /**
 266          * Handle redirects for uncanonical title requests.
 267          *
 268          * Handles:
 269          * - Redirect loops.
 270          * - No title in URL.
 271          * - $wgUsePathInfo URLs.
 272          * - URLs with a variant.
 273          * - Other non-standard URLs (as long as they have no extra query parameters).
 274          *
 275          * Behaviour:
 276          * - Normalise title values:
 277          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 278          * - Normalise empty title:
 279          *   /wiki/ -> /wiki/Main
 280          *   /w/index.php?title= -> /wiki/Main
 281          * - Normalise non-standard title urls:
 282          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 283          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 284          *
 285          * @param Title $title
 286          * @return bool True if a redirect was set.
 287          * @throws HttpError
 288          */
 289         private function tryNormaliseRedirect( Title $title ) {
 290                 $request = $this->context->getRequest();
 291                 $output = $this->context->getOutput();
 292
 293                 if ( $request->getVal( 'action', 'view' ) != 'view'
 294                         || $request->wasPosted()
 295                         || count( $request->getValueNames( array( 'action', 'title' ) ) )
 296                         || !Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 297                 ) {
 298                         return false;
 299                 }
 300
 301                 if ( $title->isSpecialPage() ) {
 302                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 303                         if ( $name ) {
 304                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 305                         }
 306                 }
 307                 // Redirect to canonical url, make it a 301 to allow caching
 308                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 309
 310                 if ( $targetUrl != $request->getFullRequestURL() ) {
 311                         $output->setCdnMaxage( 1200 );
 312                         $output->redirect( $targetUrl, '301' );
 313                         return true;
 314                 }
 315
 316                 // If there is no title, or the title is in a non-standard encoding, we demand
 317                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 318                 // the url is standard, the server is misconfigured.
 319                 if ( $request->getVal( 'title' ) === null
 320                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 321                 ) {
 322                         $message = "Redirect loop detected!\n\n" .
 323                                 "This means the wiki got confused about what page was " .
 324                                 "requested; this sometimes happens when moving a wiki " .
 325                                 "to a new server or changing the server configuration.\n\n";
 326
 327                         if ( $this->config->get( 'UsePathInfo' ) ) {
 328                                 $message .= "The wiki is trying to interpret the page " .
 329                                         "title from the URL path portion (PATH_INFO), which " .
 330                                         "sometimes fails depending on the web server. Try " .
 331                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 332                                         "LocalSettings.php, or check that \$wgArticlePath " .
 333                                         "is correct.";
 334                         } else {
 335                                 $message .= "Your web server was detected as possibly not " .
 336                                         "supporting URL path components (PATH_INFO) correctly; " .
 337                                         "check your LocalSettings.php for a customized " .
 338                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 339                                         "to true.";
 340                         }
 341                         throw new HttpError( 500, $message );
 342                 }
 343                 return false;
 344         }
 345
 346         /**
 347          * Initialize the main Article object for "standard" actions (view, etc)
 348          * Create an Article object for the page, following redirects if needed.
 349          *
 350          * @return mixed An Article, or a string to redirect to another URL
 351          */
 352         private function initializeArticle() {
 353
 354                 $title = $this->context->getTitle();
 355                 if ( $this->context->canUseWikiPage() ) {
 356                         // Try to use request context wiki page, as there
 357                         // is already data from db saved in per process
 358                         // cache there from this->getAction() call.
 359                         $page = $this->context->getWikiPage();
 360                         $article = Article::newFromWikiPage( $page, $this->context );
 361                 } else {
 362                         // This case should not happen, but just in case.
 363                         $article = Article::newFromTitle( $title, $this->context );
 364                         $this->context->setWikiPage( $article->getPage() );
 365                 }
 366
 367                 // Skip some unnecessary code if the content model doesn't support redirects
 368                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 369                         return $article;
 370                 }
 371
 372                 $request = $this->context->getRequest();
 373
 374                 // Namespace might change when using redirects
 375                 // Check for redirects ...
 376                 $action = $request->getVal( 'action', 'view' );
 377                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 378                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 379                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 380                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 381                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 382                         // ... and the article is not a non-redirect image page with associated file
 383                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 384                 ) {
 385                         // Give extensions a change to ignore/handle redirects as needed
 386                         $ignoreRedirect = $target = false;
 387
 388                         Hooks::run( 'InitializeArticleMaybeRedirect',
 389                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 390
 391                         // Follow redirects only for... redirects.
 392                         // If $target is set, then a hook wanted to redirect.
 393                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 394                                 // Is the target already set by an extension?
 395                                 $target = $target ? $target : $article->followRedirect();
 396                                 if ( is_string( $target ) ) {
 397                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 398                                                 // we'll need to redirect
 399                                                 return $target;
 400                                         }
 401                                 }
 402                                 if ( is_object( $target ) ) {
 403                                         // Rewrite environment to redirected article
 404                                         $rarticle = Article::newFromTitle( $target, $this->context );
 405                                         $rarticle->loadPageData();
 406                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 407                                                 $rarticle->setRedirectedFrom( $title );
 408                                                 $article = $rarticle;
 409                                                 $this->context->setTitle( $target );
 410                                                 $this->context->setWikiPage( $article->getPage() );
 411                                         }
 412                                 }
 413                         } else {
 414                                 $this->context->setTitle( $article->getTitle() );
 415                                 $this->context->setWikiPage( $article->getPage() );
 416                         }
 417                 }
 418
 419                 return $article;
 420         }
 421
 422         /**
 423          * Perform one of the "standard" actions
 424          *
 425          * @param Page $page
 426          * @param Title $requestTitle The original title, before any redirects were applied
 427          */
 428         private function performAction( Page $page, Title $requestTitle ) {
 429
 430                 $request = $this->context->getRequest();
 431                 $output = $this->context->getOutput();
 432                 $title = $this->context->getTitle();
 433                 $user = $this->context->getUser();
 434
 435                 if ( !Hooks::run( 'MediaWikiPerformAction',
 436                                 array( $output, $page, $title, $user, $request, $this ) )
 437                 ) {
 438                         return;
 439                 }
 440
 441                 $act = $this->getAction();
 442
 443                 $action = Action::factory( $act, $page, $this->context );
 444
 445                 if ( $action instanceof Action ) {
 446                         # Let CDN cache things if we can purge them.
 447                         if ( $this->config->get( 'UseSquid' ) &&
 448                                 in_array(
 449                                         // Use PROTO_INTERNAL because that's what getCdnUrls() uses
 450                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 451                                         $requestTitle->getCdnUrls()
 452                                 )
 453                         ) {
 454                                 $output->setCdnMaxage( $this->config->get( 'SquidMaxage' ) );
 455                         }
 456
 457                         $action->show();
 458                         return;
 459                 }
 460
 461                 if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 462                         $output->setStatusCode( 404 );
 463                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 464                 }
 465
 466         }
 467
 468         /**
 469          * Run the current MediaWiki instance; index.php just calls this
 470          */
 471         public function run() {
 472                 try {
 473                         try {
 474                                 $this->main();
 475                         } catch ( ErrorPageError $e ) {
 476                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 477                                 // they are not internal application faults. As with normal requests, this
 478                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 479                                 $this->doPreOutputCommit();
 480                                 $e->report(); // display the GUI error
 481                         }
 482                 } catch ( Exception $e ) {
 483                         MWExceptionHandler::handleException( $e );
 484                 }
 485
 486                 $this->doPostOutputShutdown( 'normal' );
 487         }
 488
 489         /**
 490          * @see MediaWiki::preOutputCommit()
 491          * @since 1.26
 492          */
 493         public function doPreOutputCommit() {
 494                 self::preOutputCommit( $this->context );
 495         }
 496
 497         /**
 498          * This function commits all DB changes as needed before
 499          * the user can receive a response (in case commit fails)
 500          *
 501          * @param IContextSource $context
 502          * @since 1.27
 503          */
 504         public static function preOutputCommit( IContextSource $context ) {
 505                 // Either all DBs should commit or none
 506                 ignore_user_abort( true );
 507
 508                 $config = $context->getConfig();
 509
 510                 $factory = wfGetLBFactory();
 511                 // Check if any transaction was too big
 512                 $limit = $config->get( 'MaxUserDBWriteDuration' );
 513                 $factory->forEachLB( function ( LoadBalancer $lb ) use ( $limit ) {
 514                         $lb->forEachOpenConnection( function ( IDatabase $db ) use ( $limit ) {
 515                                 $time = $db->pendingWriteQueryDuration();
 516                                 if ( $limit > 0 && $time > $limit ) {
 517                                         throw new DBTransactionError(
 518                                                 $db,
 519                                                 wfMessage( 'transaction-duration-limit-exceeded', $time, $limit )->plain()
 520                                         );
 521                                 }
 522                         } );
 523                 } );
 524                 // Commit all changes
 525                 $factory->commitMasterChanges();
 526                 // Record ChronologyProtector positions
 527                 $factory->shutdown();
 528                 wfDebug( __METHOD__ . ': all transactions committed' );
 529
 530                 DeferredUpdates::doUpdates( 'enqueue', DeferredUpdates::PRESEND );
 531                 wfDebug( __METHOD__ . ': pre-send deferred updates completed' );
 532
 533                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the
 534                 // DC that handles this POST request (e.g. the "master" data center)
 535                 $request = $context->getRequest();
 536                 if ( $request->wasPosted() && $factory->hasOrMadeRecentMasterChanges() ) {
 537                         $expires = time() + $config->get( 'DataCenterUpdateStickTTL' );
 538                         $request->response()->setCookie( 'UseDC', 'master', $expires, array( 'prefix' => '' ) );
 539                 }
 540
 541                 // Avoid letting a few seconds of slave lag cause a month of stale data
 542                 if ( $factory->laggedSlaveUsed() ) {
 543                         $maxAge = $config->get( 'CdnMaxageLagged' );
 544                         $context->getOutput()->lowerCdnMaxage( $maxAge );
 545                         $request->response()->header( "X-Database-Lagged: true" );
 546                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 547                 }
 548         }
 549
 550         /**
 551          * This function does work that can be done *after* the
 552          * user gets the HTTP response so they don't block on it
 553          *
 554          * This manages deferred updates, job insertion,
 555          * final commit, and the logging of profiling data
 556          *
 557          * @param string $mode Use 'fast' to always skip job running
 558          * @since 1.26
 559          */
 560         public function doPostOutputShutdown( $mode = 'normal' ) {
 561                 $timing = $this->context->getTiming();
 562                 $timing->mark( 'requestShutdown' );
 563
 564                 // Show visible profiling data if enabled (which cannot be post-send)
 565                 Profiler::instance()->logDataPageOutputOnly();
 566
 567                 $that = $this;
 568                 $callback = function () use ( $that, $mode ) {
 569                         try {
 570                                 $that->restInPeace( $mode );
 571                         } catch ( Exception $e ) {
 572                                 MWExceptionHandler::handleException( $e );
 573                         }
 574                 };
 575
 576                 // Defer everything else...
 577                 if ( function_exists( 'register_postsend_function' ) ) {
 578                         // https://github.com/facebook/hhvm/issues/1230
 579                         register_postsend_function( $callback );
 580                 } else {
 581                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 582                                 fastcgi_finish_request();
 583                         } else {
 584                                 // Either all DB and deferred updates should happen or none.
 585                                 // The later should not be cancelled due to client disconnect.
 586                                 ignore_user_abort( true );
 587                         }
 588
 589                         $callback();
 590                 }
 591         }
 592
 593         private function main() {
 594                 global $wgTitle, $wgTrxProfilerLimits;
 595
 596                 $request = $this->context->getRequest();
 597
 598                 // Send Ajax requests to the Ajax dispatcher.
 599                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 600                         // Set a dummy title, because $wgTitle == null might break things
 601                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 602                                 . __METHOD__
 603                         );
 604                         $this->context->setTitle( $title );
 605                         $wgTitle = $title;
 606
 607                         $dispatcher = new AjaxDispatcher( $this->config );
 608                         $dispatcher->performAction( $this->context->getUser() );
 609                         return;
 610                 }
 611
 612                 // Get title from request parameters,
 613                 // is set on the fly by parseTitle the first time.
 614                 $title = $this->getTitle();
 615                 $action = $this->getAction();
 616                 $wgTitle = $title;
 617
 618                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 619                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 620
 621                 // Aside from rollback, master queries should not happen on GET requests.
 622                 // Periodic or "in passing" updates on GET should use the job queue.
 623                 if ( !$request->wasPosted()
 624                         && in_array( $action, array( 'view', 'edit', 'history' ) )
 625                 ) {
 626                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['GET'], __METHOD__ );
 627                 } else {
 628                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['POST'], __METHOD__ );
 629                 }
 630
 631                 // If the user has forceHTTPS set to true, or if the user
 632                 // is in a group requiring HTTPS, or if they have the HTTPS
 633                 // preference set, redirect them to HTTPS.
 634                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 635                 // isLoggedIn() will do all sorts of weird stuff.
 636                 if (
 637                         $request->getProtocol() == 'http' &&
 638                         (
 639                                 $request->getCookie( 'forceHTTPS', '' ) ||
 640                                 // check for prefixed version for currently logged in users
 641                                 $request->getCookie( 'forceHTTPS' ) ||
 642                                 // Avoid checking the user and groups unless it's enabled.
 643                                 (
 644                                         $this->context->getUser()->isLoggedIn()
 645                                         && $this->context->getUser()->requiresHTTPS()
 646                                 )
 647                         )
 648                 ) {
 649                         $oldUrl = $request->getFullRequestURL();
 650                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 651
 652                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 653                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 654
 655                                 if ( $request->wasPosted() ) {
 656                                         // This is weird and we'd hope it almost never happens. This
 657                                         // means that a POST came in via HTTP and policy requires us
 658                                         // redirecting to HTTPS. It's likely such a request is going
 659                                         // to fail due to post data being lost, but let's try anyway
 660                                         // and just log the instance.
 661
 662                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 663                                         // to see how clients (automated & browser) behave when we do
 664                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 665                                 }
 666                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 667                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 668                                 $this->context->setTitle( $title );
 669                                 $output = $this->context->getOutput();
 670                                 // Since we only do this redir to change proto, always send a vary header
 671                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 672                                 $output->redirect( $redirUrl );
 673                                 $output->output();
 674                                 return;
 675                         }
 676                 }
 677
 678                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 679                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 680                                 // Try low-level file cache hit
 681                                 $cache = new HTMLFileCache( $title, $action );
 682                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 683                                         // Check incoming headers to see if client has this cached
 684                                         $timestamp = $cache->cacheTimestamp();
 685                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 686                                                 $cache->loadFromFileCache( $this->context );
 687                                         }
 688                                         // Do any stats increment/watchlist stuff
 689                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 690                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 691                                         // Tell OutputPage that output is taken care of
 692                                         $this->context->getOutput()->disable();
 693                                         return;
 694                                 }
 695                         }
 696                 }
 697
 698                 // Actually do the work of the request and build up any output
 699                 $this->performRequest();
 700
 701                 // Now commit any transactions, so that unreported errors after
 702                 // output() don't roll back the whole DB transaction and so that
 703                 // we avoid having both success and error text in the response
 704                 $this->doPreOutputCommit();
 705
 706                 // Output everything!
 707                 $this->context->getOutput()->output();
 708         }
 709
 710         /**
 711          * Ends this task peacefully
 712          * @param string $mode Use 'fast' to always skip job running
 713          */
 714         public function restInPeace( $mode = 'fast' ) {
 715                 // Assure deferred updates are not in the main transaction
 716                 wfGetLBFactory()->commitMasterChanges();
 717
 718                 // Ignore things like master queries/connections on GET requests
 719                 // as long as they are in deferred updates (which catch errors).
 720                 Profiler::instance()->getTransactionProfiler()->resetExpectations();
 721
 722                 // Do any deferred jobs
 723                 DeferredUpdates::doUpdates( 'enqueue' );
 724
 725                 // Make sure any lazy jobs are pushed
 726                 JobQueueGroup::pushLazyJobs();
 727
 728                 // Now that everything specific to this request is done,
 729                 // try to occasionally run jobs (if enabled) from the queues
 730                 if ( $mode === 'normal' ) {
 731                         $this->triggerJobs();
 732                 }
 733
 734                 // Log profiling data, e.g. in the database or UDP
 735                 wfLogProfilingData();
 736
 737                 // Commit and close up!
 738                 $factory = wfGetLBFactory();
 739                 $factory->commitMasterChanges();
 740                 $factory->shutdown( LBFactory::SHUTDOWN_NO_CHRONPROT );
 741
 742                 wfDebug( "Request ended normally\n" );
 743         }
 744
 745         /**
 746          * Potentially open a socket and sent an HTTP request back to the server
 747          * to run a specified number of jobs. This registers a callback to cleanup
 748          * the socket once it's done.
 749          */
 750         public function triggerJobs() {
 751                 $jobRunRate = $this->config->get( 'JobRunRate' );
 752                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 753                         return;
 754                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 755                         return; // recursion guard
 756                 }
 757
 758                 if ( $jobRunRate < 1 ) {
 759                         $max = mt_getrandmax();
 760                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 761                                 return; // the higher the job run rate, the less likely we return here
 762                         }
 763                         $n = 1;
 764                 } else {
 765                         $n = intval( $jobRunRate );
 766                 }
 767
 768                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 769
 770                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 771                         // Fall back to running the job here while the user waits
 772                         $runner = new JobRunner( $runJobsLogger );
 773                         $runner->run( array( 'maxJobs'  => $n ) );
 774                         return;
 775                 }
 776
 777                 try {
 778                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 779                                 return; // do not send request if there are probably no jobs
 780                         }
 781                 } catch ( JobQueueError $e ) {
 782                         MWExceptionHandler::logException( $e );
 783                         return; // do not make the site unavailable
 784                 }
 785
 786                 $query = array( 'title' => 'Special:RunJobs',
 787                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 788                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 789                         $query, $this->config->get( 'SecretKey' ) );
 790
 791                 $errno = $errstr = null;
 792                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 793                 MediaWiki\suppressWarnings();
 794                 $sock = fsockopen(
 795                         $info['host'],
 796                         isset( $info['port'] ) ? $info['port'] : 80,
 797                         $errno,
 798                         $errstr,
 799                         // If it takes more than 100ms to connect to ourselves there
 800                         // is a problem elsewhere.
 801                         0.1
 802                 );
 803                 MediaWiki\restoreWarnings();
 804                 if ( !$sock ) {
 805                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 806                         // Fall back to running the job here while the user waits
 807                         $runner = new JobRunner( $runJobsLogger );
 808                         $runner->run( array( 'maxJobs'  => $n ) );
 809                         return;
 810                 }
 811
 812                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 813                 $req = (
 814                         "POST $url HTTP/1.1\r\n" .
 815                         "Host: {$info['host']}\r\n" .
 816                         "Connection: Close\r\n" .
 817                         "Content-Length: 0\r\n\r\n"
 818                 );
 819
 820                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 821                 // Send a cron API request to be performed in the background.
 822                 // Give up if this takes too long to send (which should be rare).
 823                 stream_set_timeout( $sock, 1 );
 824                 $bytes = fwrite( $sock, $req );
 825                 if ( $bytes !== strlen( $req ) ) {
 826                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 827                 } else {
 828                         // Do not wait for the response (the script should handle client aborts).
 829                         // Make sure that we don't close before that script reaches ignore_user_abort().
 830                         $status = fgets( $sock );
 831                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 832                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 833                         }
 834                 }
 835                 fclose( $sock );
 836         }
 837 }