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
 210                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 211                         $this->context->setTitle( $badTitle );
 212                         $wgTitle = $badTitle;
 213
 214                         throw new PermissionsError( 'read', $permErrors );
 215                 }
 216
 217                 // Interwiki redirects
 218                 if ( $title->isExternal() ) {
 219                         $rdfrom = $request->getVal( 'rdfrom' );
 220                         if ( $rdfrom ) {
 221                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 222                         } else {
 223                                 $query = $request->getValues();
 224                                 unset( $query['title'] );
 225                                 $url = $title->getFullURL( $query );
 226                         }
 227                         // Check for a redirect loop
 228                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 229                                 && $title->isLocal()
 230                         ) {
 231                                 // 301 so google et al report the target as the actual url.
 232                                 $output->redirect( $url, 301 );
 233                         } else {
 234                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 235                                 try {
 236                                         $this->parseTitle();
 237                                 } catch ( MalformedTitleException $ex ) {
 238                                         throw new BadTitleError( $ex );
 239                                 }
 240                                 throw new BadTitleError();
 241                         }
 242                 // Handle any other redirects.
 243                 // Redirect loops, titleless URL, $wgUsePathInfo URLs, and URLs with a variant
 244                 } elseif ( !$this->tryNormaliseRedirect( $title ) ) {
 245
 246                         // Special pages
 247                         if ( NS_SPECIAL == $title->getNamespace() ) {
 248                                 // Actions that need to be made when we have a special pages
 249                                 SpecialPageFactory::executePath( $title, $this->context );
 250                         } else {
 251                                 // ...otherwise treat it as an article view. The article
 252                                 // may still be a wikipage redirect to another article or URL.
 253                                 $article = $this->initializeArticle();
 254                                 if ( is_object( $article ) ) {
 255                                         $this->performAction( $article, $requestTitle );
 256                                 } elseif ( is_string( $article ) ) {
 257                                         $output->redirect( $article );
 258                                 } else {
 259                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 260                                                 . " returned neither an object nor a URL" );
 261                                 }
 262                         }
 263                 }
 264         }
 265
 266         /**
 267          * Handle redirects for uncanonical title requests.
 268          *
 269          * Handles:
 270          * - Redirect loops.
 271          * - No title in URL.
 272          * - $wgUsePathInfo URLs.
 273          * - URLs with a variant.
 274          * - Other non-standard URLs (as long as they have no extra query parameters).
 275          *
 276          * Behaviour:
 277          * - Normalise title values:
 278          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 279          * - Normalise empty title:
 280          *   /wiki/ -> /wiki/Main
 281          *   /w/index.php?title= -> /wiki/Main
 282          * - Normalise non-standard title urls:
 283          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 284          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 285          *
 286          * @param Title $title
 287          * @return bool True if a redirect was set.
 288          * @throws HttpError
 289          */
 290         private function tryNormaliseRedirect( Title $title ) {
 291                 $request = $this->context->getRequest();
 292                 $output = $this->context->getOutput();
 293
 294                 if ( $request->getVal( 'action', 'view' ) != 'view'
 295                         || $request->wasPosted()
 296                         || count( $request->getValueNames( array( 'action', 'title' ) ) )
 297                         || !Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 298                 ) {
 299                         return false;
 300                 }
 301
 302                 if ( $title->isSpecialPage() ) {
 303                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 304                         if ( $name ) {
 305                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 306                         }
 307                 }
 308                 // Redirect to canonical url, make it a 301 to allow caching
 309                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 310
 311                 if ( $targetUrl != $request->getFullRequestURL() ) {
 312                         $output->setSquidMaxage( 1200 );
 313                         $output->redirect( $targetUrl, '301' );
 314                         return true;
 315                 }
 316
 317                 // If there is no title, or the title is in a non-standard encoding, we demand
 318                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 319                 // the url is standard, the server is misconfigured.
 320                 if ( $request->getVal( 'title' ) === null
 321                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 322                 ) {
 323                         $message = "Redirect loop detected!\n\n" .
 324                                 "This means the wiki got confused about what page was " .
 325                                 "requested; this sometimes happens when moving a wiki " .
 326                                 "to a new server or changing the server configuration.\n\n";
 327
 328                         if ( $this->config->get( 'UsePathInfo' ) ) {
 329                                 $message .= "The wiki is trying to interpret the page " .
 330                                         "title from the URL path portion (PATH_INFO), which " .
 331                                         "sometimes fails depending on the web server. Try " .
 332                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 333                                         "LocalSettings.php, or check that \$wgArticlePath " .
 334                                         "is correct.";
 335                         } else {
 336                                 $message .= "Your web server was detected as possibly not " .
 337                                         "supporting URL path components (PATH_INFO) correctly; " .
 338                                         "check your LocalSettings.php for a customized " .
 339                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 340                                         "to true.";
 341                         }
 342                         throw new HttpError( 500, $message );
 343                 }
 344                 return false;
 345         }
 346
 347         /**
 348          * Initialize the main Article object for "standard" actions (view, etc)
 349          * Create an Article object for the page, following redirects if needed.
 350          *
 351          * @return mixed An Article, or a string to redirect to another URL
 352          */
 353         private function initializeArticle() {
 354
 355                 $title = $this->context->getTitle();
 356                 if ( $this->context->canUseWikiPage() ) {
 357                         // Try to use request context wiki page, as there
 358                         // is already data from db saved in per process
 359                         // cache there from this->getAction() call.
 360                         $page = $this->context->getWikiPage();
 361                         $article = Article::newFromWikiPage( $page, $this->context );
 362                 } else {
 363                         // This case should not happen, but just in case.
 364                         $article = Article::newFromTitle( $title, $this->context );
 365                         $this->context->setWikiPage( $article->getPage() );
 366                 }
 367
 368                 // Skip some unnecessary code if the content model doesn't support redirects
 369                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 370                         return $article;
 371                 }
 372
 373                 $request = $this->context->getRequest();
 374
 375                 // Namespace might change when using redirects
 376                 // Check for redirects ...
 377                 $action = $request->getVal( 'action', 'view' );
 378                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 379                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 380                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 381                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 382                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 383                         // ... and the article is not a non-redirect image page with associated file
 384                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 385                 ) {
 386                         // Give extensions a change to ignore/handle redirects as needed
 387                         $ignoreRedirect = $target = false;
 388
 389                         Hooks::run( 'InitializeArticleMaybeRedirect',
 390                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 391
 392                         // Follow redirects only for... redirects.
 393                         // If $target is set, then a hook wanted to redirect.
 394                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 395                                 // Is the target already set by an extension?
 396                                 $target = $target ? $target : $article->followRedirect();
 397                                 if ( is_string( $target ) ) {
 398                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 399                                                 // we'll need to redirect
 400                                                 return $target;
 401                                         }
 402                                 }
 403                                 if ( is_object( $target ) ) {
 404                                         // Rewrite environment to redirected article
 405                                         $rarticle = Article::newFromTitle( $target, $this->context );
 406                                         $rarticle->loadPageData();
 407                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 408                                                 $rarticle->setRedirectedFrom( $title );
 409                                                 $article = $rarticle;
 410                                                 $this->context->setTitle( $target );
 411                                                 $this->context->setWikiPage( $article->getPage() );
 412                                         }
 413                                 }
 414                         } else {
 415                                 $this->context->setTitle( $article->getTitle() );
 416                                 $this->context->setWikiPage( $article->getPage() );
 417                         }
 418                 }
 419
 420                 return $article;
 421         }
 422
 423         /**
 424          * Perform one of the "standard" actions
 425          *
 426          * @param Page $page
 427          * @param Title $requestTitle The original title, before any redirects were applied
 428          */
 429         private function performAction( Page $page, Title $requestTitle ) {
 430
 431                 $request = $this->context->getRequest();
 432                 $output = $this->context->getOutput();
 433                 $title = $this->context->getTitle();
 434                 $user = $this->context->getUser();
 435
 436                 if ( !Hooks::run( 'MediaWikiPerformAction',
 437                                 array( $output, $page, $title, $user, $request, $this ) )
 438                 ) {
 439                         return;
 440                 }
 441
 442                 $act = $this->getAction();
 443
 444                 $action = Action::factory( $act, $page, $this->context );
 445
 446                 if ( $action instanceof Action ) {
 447                         # Let Squid cache things if we can purge them.
 448                         if ( $this->config->get( 'UseSquid' ) &&
 449                                 in_array(
 450                                         // Use PROTO_INTERNAL because that's what getSquidURLs() uses
 451                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 452                                         $requestTitle->getSquidURLs()
 453                                 )
 454                         ) {
 455                                 $output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
 456                         }
 457
 458                         $action->show();
 459                         return;
 460                 }
 461
 462                 if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 463                         $output->setStatusCode( 404 );
 464                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 465                 }
 466
 467         }
 468
 469         /**
 470          * Run the current MediaWiki instance; index.php just calls this
 471          */
 472         public function run() {
 473                 try {
 474                         try {
 475                                 $this->main();
 476                         } catch ( ErrorPageError $e ) {
 477                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 478                                 // they are not internal application faults. As with normal requests, this
 479                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 480                                 $this->doPreOutputCommit();
 481                                 $e->report(); // display the GUI error
 482                         }
 483                 } catch ( Exception $e ) {
 484                         MWExceptionHandler::handleException( $e );
 485                 }
 486
 487                 $this->doPostOutputShutdown( 'normal' );
 488         }
 489
 490         /**
 491          * This function commits all DB changes as needed before
 492          * the user can receive a response (in case commit fails)
 493          *
 494          * @since 1.26
 495          */
 496         public function doPreOutputCommit() {
 497                 // Either all DBs should commit or none
 498                 ignore_user_abort( true );
 499
 500                 // Commit all changes and record ChronologyProtector positions
 501                 $factory = wfGetLBFactory();
 502                 $factory->commitMasterChanges();
 503                 $factory->shutdown();
 504
 505                 wfDebug( __METHOD__ . ' completed; all transactions committed' );
 506
 507                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the
 508                 // DC that handles this POST request (e.g. the "master" data center)
 509                 $request = $this->context->getRequest();
 510                 if ( $request->wasPosted() && $factory->hasOrMadeRecentMasterChanges() ) {
 511                         $expires = time() + $this->config->get( 'DataCenterUpdateStickTTL' );
 512                         $request->response()->setCookie( 'UseDC', 'master', $expires );
 513                 }
 514
 515                 // Avoid letting a few seconds of slave lag cause a month of stale data
 516                 if ( $factory->laggedSlaveUsed() ) {
 517                         $maxAge = $this->config->get( 'CdnMaxageLagged' );
 518                         $this->context->getOutput()->lowerCdnMaxage( $maxAge );
 519                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 520                 }
 521         }
 522
 523         /**
 524          * This function does work that can be done *after* the
 525          * user gets the HTTP response so they don't block on it
 526          *
 527          * This manages deferred updates, job insertion,
 528          * final commit, and the logging of profiling data
 529          *
 530          * @param string $mode Use 'fast' to always skip job running
 531          * @since 1.26
 532          */
 533         public function doPostOutputShutdown( $mode = 'normal' ) {
 534                 // Show visible profiling data if enabled (which cannot be post-send)
 535                 Profiler::instance()->logDataPageOutputOnly();
 536
 537                 $that = $this;
 538                 $callback = function () use ( $that, $mode ) {
 539                         try {
 540                                 $that->restInPeace( $mode );
 541                         } catch ( Exception $e ) {
 542                                 MWExceptionHandler::handleException( $e );
 543                         }
 544                 };
 545
 546                 // Defer everything else...
 547                 if ( function_exists( 'register_postsend_function' ) ) {
 548                         // https://github.com/facebook/hhvm/issues/1230
 549                         register_postsend_function( $callback );
 550                 } else {
 551                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 552                                 fastcgi_finish_request();
 553                         } else {
 554                                 // Either all DB and deferred updates should happen or none.
 555                                 // The later should not be cancelled due to client disconnect.
 556                                 ignore_user_abort( true );
 557                         }
 558
 559                         $callback();
 560                 }
 561         }
 562
 563         private function main() {
 564                 global $wgTitle, $wgTrxProfilerLimits;
 565
 566                 $request = $this->context->getRequest();
 567
 568                 // Send Ajax requests to the Ajax dispatcher.
 569                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 570                         // Set a dummy title, because $wgTitle == null might break things
 571                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 572                                 . __METHOD__
 573                         );
 574                         $this->context->setTitle( $title );
 575                         $wgTitle = $title;
 576
 577                         $dispatcher = new AjaxDispatcher( $this->config );
 578                         $dispatcher->performAction( $this->context->getUser() );
 579                         return;
 580                 }
 581
 582                 // Get title from request parameters,
 583                 // is set on the fly by parseTitle the first time.
 584                 $title = $this->getTitle();
 585                 $action = $this->getAction();
 586                 $wgTitle = $title;
 587
 588                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 589                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 590
 591                 // Aside from rollback, master queries should not happen on GET requests.
 592                 // Periodic or "in passing" updates on GET should use the job queue.
 593                 if ( !$request->wasPosted()
 594                         && in_array( $action, array( 'view', 'edit', 'history' ) )
 595                 ) {
 596                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['GET'], __METHOD__ );
 597                 } else {
 598                         $trxProfiler->setExpectations( $wgTrxProfilerLimits['POST'], __METHOD__ );
 599                 }
 600
 601                 // If the user has forceHTTPS set to true, or if the user
 602                 // is in a group requiring HTTPS, or if they have the HTTPS
 603                 // preference set, redirect them to HTTPS.
 604                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 605                 // isLoggedIn() will do all sorts of weird stuff.
 606                 if (
 607                         $request->getProtocol() == 'http' &&
 608                         (
 609                                 $request->getCookie( 'forceHTTPS', '' ) ||
 610                                 // check for prefixed version for currently logged in users
 611                                 $request->getCookie( 'forceHTTPS' ) ||
 612                                 // Avoid checking the user and groups unless it's enabled.
 613                                 (
 614                                         $this->context->getUser()->isLoggedIn()
 615                                         && $this->context->getUser()->requiresHTTPS()
 616                                 )
 617                         )
 618                 ) {
 619                         $oldUrl = $request->getFullRequestURL();
 620                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 621
 622                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 623                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 624
 625                                 if ( $request->wasPosted() ) {
 626                                         // This is weird and we'd hope it almost never happens. This
 627                                         // means that a POST came in via HTTP and policy requires us
 628                                         // redirecting to HTTPS. It's likely such a request is going
 629                                         // to fail due to post data being lost, but let's try anyway
 630                                         // and just log the instance.
 631                                         //
 632                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 633                                         // to see how clients (automated & browser) behave when we do
 634                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 635                                 }
 636                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 637                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 638                                 $this->context->setTitle( $title );
 639                                 $output = $this->context->getOutput();
 640                                 // Since we only do this redir to change proto, always send a vary header
 641                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 642                                 $output->redirect( $redirUrl );
 643                                 $output->output();
 644                                 return;
 645                         }
 646                 }
 647
 648                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 649                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 650                                 // Try low-level file cache hit
 651                                 $cache = new HTMLFileCache( $title, $action );
 652                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 653                                         // Check incoming headers to see if client has this cached
 654                                         $timestamp = $cache->cacheTimestamp();
 655                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 656                                                 $cache->loadFromFileCache( $this->context );
 657                                         }
 658                                         // Do any stats increment/watchlist stuff
 659                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 660                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 661                                         // Tell OutputPage that output is taken care of
 662                                         $this->context->getOutput()->disable();
 663                                         return;
 664                                 }
 665                         }
 666                 }
 667
 668                 // Actually do the work of the request and build up any output
 669                 $this->performRequest();
 670
 671                 // Now commit any transactions, so that unreported errors after
 672                 // output() don't roll back the whole DB transaction and so that
 673                 // we avoid having both success and error text in the response
 674                 $this->doPreOutputCommit();
 675
 676                 // Output everything!
 677                 $this->context->getOutput()->output();
 678         }
 679
 680         /**
 681          * Ends this task peacefully
 682          * @param string $mode Use 'fast' to always skip job running
 683          */
 684         public function restInPeace( $mode = 'fast' ) {
 685                 // Assure deferred updates are not in the main transaction
 686                 wfGetLBFactory()->commitMasterChanges();
 687
 688                 // Ignore things like master queries/connections on GET requests
 689                 // as long as they are in deferred updates (which catch errors).
 690                 Profiler::instance()->getTransactionProfiler()->resetExpectations();
 691
 692                 // Do any deferred jobs
 693                 DeferredUpdates::doUpdates( 'commit', 'enqueue' );
 694
 695                 // Make sure any lazy jobs are pushed
 696                 JobQueueGroup::pushLazyJobs();
 697
 698                 // Now that everything specific to this request is done,
 699                 // try to occasionally run jobs (if enabled) from the queues
 700                 if ( $mode === 'normal' ) {
 701                         $this->triggerJobs();
 702                 }
 703
 704                 // Log profiling data, e.g. in the database or UDP
 705                 wfLogProfilingData();
 706
 707                 // Commit and close up!
 708                 $factory = wfGetLBFactory();
 709                 $factory->commitMasterChanges();
 710                 $factory->shutdown();
 711
 712                 wfDebug( "Request ended normally\n" );
 713         }
 714
 715         /**
 716          * Potentially open a socket and sent an HTTP request back to the server
 717          * to run a specified number of jobs. This registers a callback to cleanup
 718          * the socket once it's done.
 719          */
 720         public function triggerJobs() {
 721                 $jobRunRate = $this->config->get( 'JobRunRate' );
 722                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 723                         return;
 724                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 725                         return; // recursion guard
 726                 }
 727
 728                 if ( $jobRunRate < 1 ) {
 729                         $max = mt_getrandmax();
 730                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 731                                 return; // the higher the job run rate, the less likely we return here
 732                         }
 733                         $n = 1;
 734                 } else {
 735                         $n = intval( $jobRunRate );
 736                 }
 737
 738                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 739
 740                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 741                         // Fall back to running the job here while the user waits
 742                         $runner = new JobRunner( $runJobsLogger );
 743                         $runner->run( array( 'maxJobs'  => $n ) );
 744                         return;
 745                 }
 746
 747                 try {
 748                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 749                                 return; // do not send request if there are probably no jobs
 750                         }
 751                 } catch ( JobQueueError $e ) {
 752                         MWExceptionHandler::logException( $e );
 753                         return; // do not make the site unavailable
 754                 }
 755
 756                 $query = array( 'title' => 'Special:RunJobs',
 757                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 758                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 759                         $query, $this->config->get( 'SecretKey' ) );
 760
 761                 $errno = $errstr = null;
 762                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 763                 MediaWiki\suppressWarnings();
 764                 $sock = fsockopen(
 765                         $info['host'],
 766                         isset( $info['port'] ) ? $info['port'] : 80,
 767                         $errno,
 768                         $errstr,
 769                         // If it takes more than 100ms to connect to ourselves there
 770                         // is a problem elsewhere.
 771                         0.1
 772                 );
 773                 MediaWiki\restoreWarnings();
 774                 if ( !$sock ) {
 775                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 776                         // Fall back to running the job here while the user waits
 777                         $runner = new JobRunner( $runJobsLogger );
 778                         $runner->run( array( 'maxJobs'  => $n ) );
 779                         return;
 780                 }
 781
 782                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 783                 $req = (
 784                         "POST $url HTTP/1.1\r\n" .
 785                         "Host: {$info['host']}\r\n" .
 786                         "Connection: Close\r\n" .
 787                         "Content-Length: 0\r\n\r\n"
 788                 );
 789
 790                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 791                 // Send a cron API request to be performed in the background.
 792                 // Give up if this takes too long to send (which should be rare).
 793                 stream_set_timeout( $sock, 1 );
 794                 $bytes = fwrite( $sock, $req );
 795                 if ( $bytes !== strlen( $req ) ) {
 796                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 797                 } else {
 798                         // Do not wait for the response (the script should handle client aborts).
 799                         // Make sure that we don't close before that script reaches ignore_user_abort().
 800                         $status = fgets( $sock );
 801                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 802                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 803                         }
 804                 }
 805                 fclose( $sock );
 806         }
 807 }