includes/MediaWiki.php

   1 <?php
   2 /**
   3  * Helper class for the index.php entry point.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * The MediaWiki class is the helper class for the index.php entry point.
  28  */
  29 class MediaWiki {
  30         /**
  31          * @var IContextSource
  32          */
  33         private $context;
  34
  35         /**
  36          * @var Config
  37          */
  38         private $config;
  39
  40         /**
  41          * @var String Cache what action this request is
  42          */
  43         private $action;
  44
  45         /**
  46          * @param IContextSource|null $context
  47          */
  48         public function __construct( IContextSource $context = null ) {
  49                 if ( !$context ) {
  50                         $context = RequestContext::getMain();
  51                 }
  52
  53                 $this->context = $context;
  54                 $this->config = $context->getConfig();
  55         }
  56
  57         /**
  58          * Parse the request to get the Title object
  59          *
  60          * @throws MalformedTitleException If a title has been provided by the user, but is invalid.
  61          * @return Title Title object to be $wgTitle
  62          */
  63         private function parseTitle() {
  64                 global $wgContLang;
  65
  66                 $request = $this->context->getRequest();
  67                 $curid = $request->getInt( 'curid' );
  68                 $title = $request->getVal( 'title' );
  69                 $action = $request->getVal( 'action' );
  70
  71                 if ( $request->getCheck( 'search' ) ) {
  72                         // Compatibility with old search URLs which didn't use Special:Search
  73                         // Just check for presence here, so blank requests still
  74                         // show the search page when using ugly URLs (bug 8054).
  75                         $ret = SpecialPage::getTitleFor( 'Search' );
  76                 } elseif ( $curid ) {
  77                         // URLs like this are generated by RC, because rc_title isn't always accurate
  78                         $ret = Title::newFromID( $curid );
  79                 } else {
  80                         $ret = Title::newFromURL( $title );
  81                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  82                         // in wikitext links to tell Parser to make a direct file link
  83                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  84                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  85                         }
  86                         // Check variant links so that interwiki links don't have to worry
  87                         // about the possible different language variants
  88                         if ( count( $wgContLang->getVariants() ) > 1
  89                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  90                         ) {
  91                                 $wgContLang->findVariantLink( $title, $ret );
  92                         }
  93                 }
  94
  95                 // If title is not provided, always allow oldid and diff to set the title.
  96                 // If title is provided, allow oldid and diff to override the title, unless
  97                 // we are talking about a special page which might use these parameters for
  98                 // other purposes.
  99                 if ( $ret === null || !$ret->isSpecialPage() ) {
 100                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 101                         $oldid = $request->getInt( 'oldid' );
 102                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 103                         // Allow oldid to override a changed or missing title
 104                         if ( $oldid ) {
 105                                 $rev = Revision::newFromId( $oldid );
 106                                 $ret = $rev ? $rev->getTitle() : $ret;
 107                         }
 108                 }
 109
 110                 // Use the main page as default title if nothing else has been provided
 111                 if ( $ret === null
 112                         && strval( $title ) === ''
 113                         && !$request->getCheck( 'curid' )
 114                         && $action !== 'delete'
 115                 ) {
 116                         $ret = Title::newMainPage();
 117                 }
 118
 119                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 120                         // If we get here, we definitely don't have a valid title; throw an exception.
 121                         // Try to get detailed invalid title exception first, fall back to MalformedTitleException.
 122                         Title::newFromTextThrow( $title );
 123                         throw new MalformedTitleException( 'badtitletext', $title );
 124                 }
 125
 126                 return $ret;
 127         }
 128
 129         /**
 130          * Get the Title object that we'll be acting on, as specified in the WebRequest
 131          * @return Title
 132          */
 133         public function getTitle() {
 134                 if ( !$this->context->hasTitle() ) {
 135                         try {
 136                                 $this->context->setTitle( $this->parseTitle() );
 137                         } catch ( MalformedTitleException $ex ) {
 138                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 139                         }
 140                 }
 141                 return $this->context->getTitle();
 142         }
 143
 144         /**
 145          * Returns the name of the action that will be executed.
 146          *
 147          * @return string Action
 148          */
 149         public function getAction() {
 150                 if ( $this->action === null ) {
 151                         $this->action = Action::getActionName( $this->context );
 152                 }
 153
 154                 return $this->action;
 155         }
 156
 157         /**
 158          * Performs the request.
 159          * - bad titles
 160          * - read restriction
 161          * - local interwiki redirects
 162          * - redirect loop
 163          * - special pages
 164          * - normal pages
 165          *
 166          * @throws MWException|PermissionsError|BadTitleError|HttpError
 167          * @return void
 168          */
 169         private function performRequest() {
 170                 global $wgTitle;
 171
 172                 $request = $this->context->getRequest();
 173                 $requestTitle = $title = $this->context->getTitle();
 174                 $output = $this->context->getOutput();
 175                 $user = $this->context->getUser();
 176
 177                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 178                         $output->setPrintable();
 179                 }
 180
 181                 $unused = null; // To pass it by reference
 182                 Hooks::run( 'BeforeInitialize', [ &$title, &$unused, &$output, &$user, $request, $this ] );
 183
 184                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 185                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 186                         || $title->isSpecial( 'Badtitle' )
 187                 ) {
 188                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 189                         try {
 190                                 $this->parseTitle();
 191                         } catch ( MalformedTitleException $ex ) {
 192                                 throw new BadTitleError( $ex );
 193                         }
 194                         throw new BadTitleError();
 195                 }
 196
 197                 // Check user's permissions to read this page.
 198                 // We have to check here to catch special pages etc.
 199                 // We will check again in Article::view().
 200                 $permErrors = $title->isSpecial( 'RunJobs' )
 201                         ? [] // relies on HMAC key signature alone
 202                         : $title->getUserPermissionsErrors( 'read', $user );
 203                 if ( count( $permErrors ) ) {
 204                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 205                         // $this->context->title set to the input title would allow anonymous users to
 206                         // determine whether a page exists, potentially leaking private data. In fact, the
 207                         // curid and oldid request  parameters would allow page titles to be enumerated even
 208                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 209                         // permissions error is displayed.
 210
 211                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 212                         // still use $wgTitle.
 213                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 214                         $this->context->setTitle( $badTitle );
 215                         $wgTitle = $badTitle;
 216
 217                         throw new PermissionsError( 'read', $permErrors );
 218                 }
 219
 220                 // Interwiki redirects
 221                 if ( $title->isExternal() ) {
 222                         $rdfrom = $request->getVal( 'rdfrom' );
 223                         if ( $rdfrom ) {
 224                                 $url = $title->getFullURL( [ 'rdfrom' => $rdfrom ] );
 225                         } else {
 226                                 $query = $request->getValues();
 227                                 unset( $query['title'] );
 228                                 $url = $title->getFullURL( $query );
 229                         }
 230                         // Check for a redirect loop
 231                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 232                                 && $title->isLocal()
 233                         ) {
 234                                 // 301 so google et al report the target as the actual url.
 235                                 $output->redirect( $url, 301 );
 236                         } else {
 237                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 238                                 try {
 239                                         $this->parseTitle();
 240                                 } catch ( MalformedTitleException $ex ) {
 241                                         throw new BadTitleError( $ex );
 242                                 }
 243                                 throw new BadTitleError();
 244                         }
 245                 // Handle any other redirects.
 246                 // Redirect loops, titleless URL, $wgUsePathInfo URLs, and URLs with a variant
 247                 } elseif ( !$this->tryNormaliseRedirect( $title ) ) {
 248                         // Prevent information leak via Special:MyPage et al (T109724)
 249                         if ( $title->isSpecialPage() ) {
 250                                 $specialPage = SpecialPageFactory::getPage( $title->getDBkey() );
 251                                 if ( $specialPage instanceof RedirectSpecialPage ) {
 252                                         $specialPage->setContext( $this->context );
 253                                         if ( $this->config->get( 'HideIdentifiableRedirects' )
 254                                                 && $specialPage->personallyIdentifiableTarget()
 255                                         ) {
 256                                                 list( , $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 257                                                 $target = $specialPage->getRedirect( $subpage );
 258                                                 // target can also be true. We let that case fall through to normal processing.
 259                                                 if ( $target instanceof Title ) {
 260                                                         $query = $specialPage->getRedirectQuery() ?: [];
 261                                                         $request = new DerivativeRequest( $this->context->getRequest(), $query );
 262                                                         $request->setRequestURL( $this->context->getRequest()->getRequestURL() );
 263                                                         $this->context->setRequest( $request );
 264                                                         // Do not varnish cache these. May vary even for anons
 265                                                         $this->context->getOutput()->lowerCdnMaxage( 0 );
 266                                                         $this->context->setTitle( $target );
 267                                                         $wgTitle = $target;
 268                                                         // Reset action type cache. (Special pages have only view)
 269                                                         $this->action = null;
 270                                                         $title = $target;
 271                                                         $output->addJsConfigVars( [
 272                                                                 'wgInternalRedirectTargetUrl' => $target->getFullURL( $query ),
 273                                                         ] );
 274                                                         $output->addModules( 'mediawiki.action.view.redirect' );
 275                                                 }
 276                                         }
 277                                 }
 278                         }
 279
 280                         // Special pages ($title may have changed since if statement above)
 281                         if ( NS_SPECIAL == $title->getNamespace() ) {
 282                                 // Actions that need to be made when we have a special pages
 283                                 SpecialPageFactory::executePath( $title, $this->context );
 284                         } else {
 285                                 // ...otherwise treat it as an article view. The article
 286                                 // may still be a wikipage redirect to another article or URL.
 287                                 $article = $this->initializeArticle();
 288                                 if ( is_object( $article ) ) {
 289                                         $this->performAction( $article, $requestTitle );
 290                                 } elseif ( is_string( $article ) ) {
 291                                         $output->redirect( $article );
 292                                 } else {
 293                                         throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 294                                                 . " returned neither an object nor a URL" );
 295                                 }
 296                         }
 297                 }
 298         }
 299
 300         /**
 301          * Handle redirects for uncanonical title requests.
 302          *
 303          * Handles:
 304          * - Redirect loops.
 305          * - No title in URL.
 306          * - $wgUsePathInfo URLs.
 307          * - URLs with a variant.
 308          * - Other non-standard URLs (as long as they have no extra query parameters).
 309          *
 310          * Behaviour:
 311          * - Normalise title values:
 312          *   /wiki/Foo%20Bar -> /wiki/Foo_Bar
 313          * - Normalise empty title:
 314          *   /wiki/ -> /wiki/Main
 315          *   /w/index.php?title= -> /wiki/Main
 316          * - Normalise non-standard title urls:
 317          *   /w/index.php?title=Foo_Bar -> /wiki/Foo_Bar
 318          * - Don't redirect anything with query parameters other than 'title' or 'action=view'.
 319          *
 320          * @param Title $title
 321          * @return bool True if a redirect was set.
 322          * @throws HttpError
 323          */
 324         private function tryNormaliseRedirect( Title $title ) {
 325                 $request = $this->context->getRequest();
 326                 $output = $this->context->getOutput();
 327
 328                 if ( $request->getVal( 'action', 'view' ) != 'view'
 329                         || $request->wasPosted()
 330                         || count( $request->getValueNames( [ 'action', 'title' ] ) )
 331                         || !Hooks::run( 'TestCanonicalRedirect', [ $request, $title, $output ] )
 332                 ) {
 333                         return false;
 334                 }
 335
 336                 if ( $title->isSpecialPage() ) {
 337                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 338                         if ( $name ) {
 339                                 $title = SpecialPage::getTitleFor( $name, $subpage );
 340                         }
 341                 }
 342                 // Redirect to canonical url, make it a 301 to allow caching
 343                 $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 344
 345                 if ( $targetUrl != $request->getFullRequestURL() ) {
 346                         $output->setCdnMaxage( 1200 );
 347                         $output->redirect( $targetUrl, '301' );
 348                         return true;
 349                 }
 350
 351                 // If there is no title, or the title is in a non-standard encoding, we demand
 352                 // a redirect. If cgi somehow changed the 'title' query to be non-standard while
 353                 // the url is standard, the server is misconfigured.
 354                 if ( $request->getVal( 'title' ) === null
 355                         || $title->getPrefixedDBkey() != $request->getVal( 'title' )
 356                 ) {
 357                         $message = "Redirect loop detected!\n\n" .
 358                                 "This means the wiki got confused about what page was " .
 359                                 "requested; this sometimes happens when moving a wiki " .
 360                                 "to a new server or changing the server configuration.\n\n";
 361
 362                         if ( $this->config->get( 'UsePathInfo' ) ) {
 363                                 $message .= "The wiki is trying to interpret the page " .
 364                                         "title from the URL path portion (PATH_INFO), which " .
 365                                         "sometimes fails depending on the web server. Try " .
 366                                         "setting \"\$wgUsePathInfo = false;\" in your " .
 367                                         "LocalSettings.php, or check that \$wgArticlePath " .
 368                                         "is correct.";
 369                         } else {
 370                                 $message .= "Your web server was detected as possibly not " .
 371                                         "supporting URL path components (PATH_INFO) correctly; " .
 372                                         "check your LocalSettings.php for a customized " .
 373                                         "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 374                                         "to true.";
 375                         }
 376                         throw new HttpError( 500, $message );
 377                 }
 378                 return false;
 379         }
 380
 381         /**
 382          * Initialize the main Article object for "standard" actions (view, etc)
 383          * Create an Article object for the page, following redirects if needed.
 384          *
 385          * @return Article|string An Article, or a string to redirect to another URL
 386          */
 387         private function initializeArticle() {
 388                 $title = $this->context->getTitle();
 389                 if ( $this->context->canUseWikiPage() ) {
 390                         // Try to use request context wiki page, as there
 391                         // is already data from db saved in per process
 392                         // cache there from this->getAction() call.
 393                         $page = $this->context->getWikiPage();
 394                 } else {
 395                         // This case should not happen, but just in case.
 396                         // @TODO: remove this or use an exception
 397                         $page = WikiPage::factory( $title );
 398                         $this->context->setWikiPage( $page );
 399                         wfWarn( "RequestContext::canUseWikiPage() returned false" );
 400                 }
 401
 402                 // Make GUI wrapper for the WikiPage
 403                 $article = Article::newFromWikiPage( $page, $this->context );
 404
 405                 // Skip some unnecessary code if the content model doesn't support redirects
 406                 if ( !ContentHandler::getForTitle( $title )->supportsRedirects() ) {
 407                         return $article;
 408                 }
 409
 410                 $request = $this->context->getRequest();
 411
 412                 // Namespace might change when using redirects
 413                 // Check for redirects ...
 414                 $action = $request->getVal( 'action', 'view' );
 415                 $file = ( $page instanceof WikiFilePage ) ? $page->getFile() : null;
 416                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 417                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 418                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 419                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 420                         // ... and the article is not a non-redirect image page with associated file
 421                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 422                 ) {
 423                         // Give extensions a change to ignore/handle redirects as needed
 424                         $ignoreRedirect = $target = false;
 425
 426                         Hooks::run( 'InitializeArticleMaybeRedirect',
 427                                 [ &$title, &$request, &$ignoreRedirect, &$target, &$article ] );
 428                         $page = $article->getPage(); // reflect any hook changes
 429
 430                         // Follow redirects only for... redirects.
 431                         // If $target is set, then a hook wanted to redirect.
 432                         if ( !$ignoreRedirect && ( $target || $page->isRedirect() ) ) {
 433                                 // Is the target already set by an extension?
 434                                 $target = $target ? $target : $page->followRedirect();
 435                                 if ( is_string( $target ) ) {
 436                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 437                                                 // we'll need to redirect
 438                                                 return $target;
 439                                         }
 440                                 }
 441                                 if ( is_object( $target ) ) {
 442                                         // Rewrite environment to redirected article
 443                                         $rpage = WikiPage::factory( $target );
 444                                         $rpage->loadPageData();
 445                                         if ( $rpage->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 446                                                 $rarticle = Article::newFromWikiPage( $rpage, $this->context );
 447                                                 $rarticle->setRedirectedFrom( $title );
 448
 449                                                 $article = $rarticle;
 450                                                 $this->context->setTitle( $target );
 451                                                 $this->context->setWikiPage( $article->getPage() );
 452                                         }
 453                                 }
 454                         } else {
 455                                 // Article may have been changed by hook
 456                                 $this->context->setTitle( $article->getTitle() );
 457                                 $this->context->setWikiPage( $article->getPage() );
 458                         }
 459                 }
 460
 461                 return $article;
 462         }
 463
 464         /**
 465          * Perform one of the "standard" actions
 466          *
 467          * @param Page $page
 468          * @param Title $requestTitle The original title, before any redirects were applied
 469          */
 470         private function performAction( Page $page, Title $requestTitle ) {
 471                 $request = $this->context->getRequest();
 472                 $output = $this->context->getOutput();
 473                 $title = $this->context->getTitle();
 474                 $user = $this->context->getUser();
 475
 476                 if ( !Hooks::run( 'MediaWikiPerformAction',
 477                                 [ $output, $page, $title, $user, $request, $this ] )
 478                 ) {
 479                         return;
 480                 }
 481
 482                 $act = $this->getAction();
 483                 $action = Action::factory( $act, $page, $this->context );
 484
 485                 if ( $action instanceof Action ) {
 486                         // Narrow DB query expectations for this HTTP request
 487                         $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 488                         $trxProfiler = Profiler::instance()->getTransactionProfiler();
 489                         if ( $request->wasPosted() && !$action->doesWrites() ) {
 490                                 $trxProfiler->setExpectations( $trxLimits['POST-nonwrite'], __METHOD__ );
 491                                 $request->markAsSafeRequest();
 492                         }
 493
 494                         # Let CDN cache things if we can purge them.
 495                         if ( $this->config->get( 'UseSquid' ) &&
 496                                 in_array(
 497                                         // Use PROTO_INTERNAL because that's what getCdnUrls() uses
 498                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 499                                         $requestTitle->getCdnUrls()
 500                                 )
 501                         ) {
 502                                 $output->setCdnMaxage( $this->config->get( 'SquidMaxage' ) );
 503                         }
 504
 505                         $action->show();
 506                         return;
 507                 }
 508
 509                 if ( Hooks::run( 'UnknownAction', [ $request->getVal( 'action', 'view' ), $page ] ) ) {
 510                         $output->setStatusCode( 404 );
 511                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 512                 }
 513         }
 514
 515         /**
 516          * Run the current MediaWiki instance; index.php just calls this
 517          */
 518         public function run() {
 519                 try {
 520                         try {
 521                                 $this->main();
 522                         } catch ( ErrorPageError $e ) {
 523                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 524                                 // they are not internal application faults. As with normal requests, this
 525                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 526                                 $this->doPreOutputCommit();
 527                                 $e->report(); // display the GUI error
 528                         }
 529                 } catch ( Exception $e ) {
 530                         MWExceptionHandler::handleException( $e );
 531                 }
 532
 533                 $this->doPostOutputShutdown( 'normal' );
 534         }
 535
 536         /**
 537          * @see MediaWiki::preOutputCommit()
 538          * @param callable $postCommitWork [default: null]
 539          * @since 1.26
 540          */
 541         public function doPreOutputCommit( callable $postCommitWork = null ) {
 542                 self::preOutputCommit( $this->context, $postCommitWork );
 543         }
 544
 545         /**
 546          * This function commits all DB changes as needed before
 547          * the user can receive a response (in case commit fails)
 548          *
 549          * @param IContextSource $context
 550          * @param callable $postCommitWork [default: null]
 551          * @since 1.27
 552          */
 553         public static function preOutputCommit(
 554                 IContextSource $context, callable $postCommitWork = null
 555         ) {
 556                 // Either all DBs should commit or none
 557                 ignore_user_abort( true );
 558
 559                 $config = $context->getConfig();
 560                 $request = $context->getRequest();
 561                 $output = $context->getOutput();
 562                 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 563
 564                 // Commit all changes
 565                 $lbFactory->commitMasterChanges(
 566                         __METHOD__,
 567                         // Abort if any transaction was too big
 568                         [ 'maxWriteDuration' => $config->get( 'MaxUserDBWriteDuration' ) ]
 569                 );
 570                 wfDebug( __METHOD__ . ': primary transaction round committed' );
 571
 572                 // Run updates that need to block the user or affect output (this is the last chance)
 573                 DeferredUpdates::doUpdates( 'enqueue', DeferredUpdates::PRESEND );
 574                 wfDebug( __METHOD__ . ': pre-send deferred updates completed' );
 575
 576                 // Decide when clients block on ChronologyProtector DB position writes
 577                 $urlDomainDistance = (
 578                         $request->wasPosted() &&
 579                         $output->getRedirect() &&
 580                         $lbFactory->hasOrMadeRecentMasterChanges( INF )
 581                 ) ? self::getUrlDomainDistance( $output->getRedirect(), $context ) : false;
 582
 583                 if ( $urlDomainDistance === 'local' || $urlDomainDistance === 'remote' ) {
 584                         // OutputPage::output() will be fast; $postCommitWork will not be useful for
 585                         // masking the latency of syncing DB positions accross all datacenters synchronously.
 586                         // Instead, make use of the RTT time of the client follow redirects.
 587                         $flags = $lbFactory::SHUTDOWN_CHRONPROT_ASYNC;
 588                         $cpPosTime = microtime( true );
 589                         // Client's next request should see 1+ positions with this DBMasterPos::asOf() time
 590                         if ( $urlDomainDistance === 'local' ) {
 591                                 // Client will stay on this domain, so set an unobtrusive cookie
 592                                 $expires = time() + ChronologyProtector::POSITION_TTL;
 593                                 $options = [ 'prefix' => '' ];
 594                                 $request->response()->setCookie( 'cpPosTime', $cpPosTime, $expires, $options );
 595                         } else {
 596                                 // Cookies may not work across wiki domains, so use a URL parameter
 597                                 $safeUrl = $lbFactory->appendPreShutdownTimeAsQuery(
 598                                         $output->getRedirect(),
 599                                         $cpPosTime
 600                                 );
 601                                 $output->redirect( $safeUrl );
 602                         }
 603                 } else {
 604                         // OutputPage::output() is fairly slow; run it in $postCommitWork to mask
 605                         // the latency of syncing DB positions accross all datacenters synchronously
 606                         $flags = $lbFactory::SHUTDOWN_CHRONPROT_SYNC;
 607                         if ( $lbFactory->hasOrMadeRecentMasterChanges( INF ) ) {
 608                                 $cpPosTime = microtime( true );
 609                                 // Set a cookie in case the DB position store cannot sync accross datacenters.
 610                                 // This will at least cover the common case of the user staying on the domain.
 611                                 $expires = time() + ChronologyProtector::POSITION_TTL;
 612                                 $options = [ 'prefix' => '' ];
 613                                 $request->response()->setCookie( 'cpPosTime', $cpPosTime, $expires, $options );
 614                         }
 615                 }
 616                 // Record ChronologyProtector positions for DBs affected in this request at this point
 617                 $lbFactory->shutdown( $flags, $postCommitWork );
 618                 wfDebug( __METHOD__ . ': LBFactory shutdown completed' );
 619
 620                 // Set a cookie to tell all CDN edge nodes to "stick" the user to the DC that handles this
 621                 // POST request (e.g. the "master" data center). Also have the user briefly bypass CDN so
 622                 // ChronologyProtector works for cacheable URLs.
 623                 if ( $request->wasPosted() && $lbFactory->hasOrMadeRecentMasterChanges() ) {
 624                         $expires = time() + $config->get( 'DataCenterUpdateStickTTL' );
 625                         $options = [ 'prefix' => '' ];
 626                         $request->response()->setCookie( 'UseDC', 'master', $expires, $options );
 627                         $request->response()->setCookie( 'UseCDNCache', 'false', $expires, $options );
 628                 }
 629
 630                 // Avoid letting a few seconds of replica DB lag cause a month of stale data. This logic is
 631                 // also intimately related to the value of $wgCdnReboundPurgeDelay.
 632                 if ( $lbFactory->laggedReplicaUsed() ) {
 633                         $maxAge = $config->get( 'CdnMaxageLagged' );
 634                         $output->lowerCdnMaxage( $maxAge );
 635                         $request->response()->header( "X-Database-Lagged: true" );
 636                         wfDebugLog( 'replication', "Lagged DB used; CDN cache TTL limited to $maxAge seconds" );
 637                 }
 638
 639                 // Avoid long-term cache pollution due to message cache rebuild timeouts (T133069)
 640                 if ( MessageCache::singleton()->isDisabled() ) {
 641                         $maxAge = $config->get( 'CdnMaxageSubstitute' );
 642                         $output->lowerCdnMaxage( $maxAge );
 643                         $request->response()->header( "X-Response-Substitute: true" );
 644                 }
 645         }
 646
 647         /**
 648          * @param string $url
 649          * @param IContextSource $context
 650          * @return string|bool Either "local" or "remote" if in the farm, false otherwise
 651          */
 652         private function getUrlDomainDistance( $url, IContextSource $context ) {
 653                 static $relevantKeys = [ 'host' => true, 'port' => true ];
 654
 655                 $infoCandidate = wfParseUrl( $url );
 656                 if ( $infoCandidate === false ) {
 657                         return false;
 658                 }
 659
 660                 $infoCandidate = array_intersect_key( $infoCandidate, $relevantKeys );
 661                 $clusterHosts = array_merge(
 662                         // Local wiki host (the most common case)
 663                         [ $context->getConfig()->get( 'CanonicalServer' ) ],
 664                         // Any local/remote wiki virtual hosts for this wiki farm
 665                         $context->getConfig()->get( 'LocalVirtualHosts' )
 666                 );
 667
 668                 foreach ( $clusterHosts as $i => $clusterHost ) {
 669                         $parseUrl = wfParseUrl( $clusterHost );
 670                         if ( !$parseUrl ) {
 671                                 continue;
 672                         }
 673                         $infoHost = array_intersect_key( $parseUrl, $relevantKeys );
 674                         if ( $infoCandidate === $infoHost ) {
 675                                 return ( $i === 0 ) ? 'local' : 'remote';
 676                         }
 677                 }
 678
 679                 return false;
 680         }
 681
 682         /**
 683          * This function does work that can be done *after* the
 684          * user gets the HTTP response so they don't block on it
 685          *
 686          * This manages deferred updates, job insertion,
 687          * final commit, and the logging of profiling data
 688          *
 689          * @param string $mode Use 'fast' to always skip job running
 690          * @since 1.26
 691          */
 692         public function doPostOutputShutdown( $mode = 'normal' ) {
 693                 $timing = $this->context->getTiming();
 694                 $timing->mark( 'requestShutdown' );
 695
 696                 // Show visible profiling data if enabled (which cannot be post-send)
 697                 Profiler::instance()->logDataPageOutputOnly();
 698
 699                 $callback = function () use ( $mode ) {
 700                         try {
 701                                 $this->restInPeace( $mode );
 702                         } catch ( Exception $e ) {
 703                                 MWExceptionHandler::handleException( $e );
 704                         }
 705                 };
 706
 707                 // Defer everything else...
 708                 if ( function_exists( 'register_postsend_function' ) ) {
 709                         // https://github.com/facebook/hhvm/issues/1230
 710                         register_postsend_function( $callback );
 711                 } else {
 712                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 713                                 fastcgi_finish_request();
 714                         } else {
 715                                 // Either all DB and deferred updates should happen or none.
 716                                 // The latter should not be cancelled due to client disconnect.
 717                                 ignore_user_abort( true );
 718                         }
 719
 720                         $callback();
 721                 }
 722         }
 723
 724         private function main() {
 725                 global $wgTitle;
 726
 727                 $output = $this->context->getOutput();
 728                 $request = $this->context->getRequest();
 729
 730                 // Send Ajax requests to the Ajax dispatcher.
 731                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 732                         // Set a dummy title, because $wgTitle == null might break things
 733                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 734                                 . __METHOD__
 735                         );
 736                         $this->context->setTitle( $title );
 737                         $wgTitle = $title;
 738
 739                         $dispatcher = new AjaxDispatcher( $this->config );
 740                         $dispatcher->performAction( $this->context->getUser() );
 741
 742                         return;
 743                 }
 744
 745                 // Get title from request parameters,
 746                 // is set on the fly by parseTitle the first time.
 747                 $title = $this->getTitle();
 748                 $action = $this->getAction();
 749                 $wgTitle = $title;
 750
 751                 // Set DB query expectations for this HTTP request
 752                 $trxLimits = $this->config->get( 'TrxProfilerLimits' );
 753                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 754                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 755                 if ( $request->hasSafeMethod() ) {
 756                         $trxProfiler->setExpectations( $trxLimits['GET'], __METHOD__ );
 757                 } else {
 758                         $trxProfiler->setExpectations( $trxLimits['POST'], __METHOD__ );
 759                 }
 760
 761                 // If the user has forceHTTPS set to true, or if the user
 762                 // is in a group requiring HTTPS, or if they have the HTTPS
 763                 // preference set, redirect them to HTTPS.
 764                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 765                 // isLoggedIn() will do all sorts of weird stuff.
 766                 if (
 767                         $request->getProtocol() == 'http' &&
 768                         // switch to HTTPS only when supported by the server
 769                         preg_match( '#^https://#', wfExpandUrl( $request->getRequestURL(), PROTO_HTTPS ) ) &&
 770                         (
 771                                 $request->getSession()->shouldForceHTTPS() ||
 772                                 // Check the cookie manually, for paranoia
 773                                 $request->getCookie( 'forceHTTPS', '' ) ||
 774                                 // check for prefixed version that was used for a time in older MW versions
 775                                 $request->getCookie( 'forceHTTPS' ) ||
 776                                 // Avoid checking the user and groups unless it's enabled.
 777                                 (
 778                                         $this->context->getUser()->isLoggedIn()
 779                                         && $this->context->getUser()->requiresHTTPS()
 780                                 )
 781                         )
 782                 ) {
 783                         $oldUrl = $request->getFullRequestURL();
 784                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 785
 786                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 787                         if ( Hooks::run( 'BeforeHttpsRedirect', [ $this->context, &$redirUrl ] ) ) {
 788
 789                                 if ( $request->wasPosted() ) {
 790                                         // This is weird and we'd hope it almost never happens. This
 791                                         // means that a POST came in via HTTP and policy requires us
 792                                         // redirecting to HTTPS. It's likely such a request is going
 793                                         // to fail due to post data being lost, but let's try anyway
 794                                         // and just log the instance.
 795
 796                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 797                                         // to see how clients (automated & browser) behave when we do
 798                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 799                                 }
 800                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 801                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 802                                 $this->context->setTitle( $title );
 803                                 // Since we only do this redir to change proto, always send a vary header
 804                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 805                                 $output->redirect( $redirUrl );
 806                                 $output->output();
 807
 808                                 return;
 809                         }
 810                 }
 811
 812                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 813                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 814                                 // Try low-level file cache hit
 815                                 $cache = new HTMLFileCache( $title, $action );
 816                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 817                                         // Check incoming headers to see if client has this cached
 818                                         $timestamp = $cache->cacheTimestamp();
 819                                         if ( !$output->checkLastModified( $timestamp ) ) {
 820                                                 $cache->loadFromFileCache( $this->context );
 821                                         }
 822                                         // Do any stats increment/watchlist stuff
 823                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 824                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 825                                         // Tell OutputPage that output is taken care of
 826                                         $output->disable();
 827
 828                                         return;
 829                                 }
 830                         }
 831                 }
 832
 833                 // Actually do the work of the request and build up any output
 834                 $this->performRequest();
 835
 836                 // GUI-ify and stash the page output in MediaWiki::doPreOutputCommit() while
 837                 // ChronologyProtector synchronizes DB positions or slaves accross all datacenters.
 838                 $buffer = null;
 839                 $outputWork = function () use ( $output, &$buffer ) {
 840                         if ( $buffer === null ) {
 841                                 $buffer = $output->output( true );
 842                         }
 843
 844                         return $buffer;
 845                 };
 846
 847                 // Now commit any transactions, so that unreported errors after
 848                 // output() don't roll back the whole DB transaction and so that
 849                 // we avoid having both success and error text in the response
 850                 $this->doPreOutputCommit( $outputWork );
 851
 852                 // Now send the actual output
 853                 print $outputWork();
 854         }
 855
 856         /**
 857          * Ends this task peacefully
 858          * @param string $mode Use 'fast' to always skip job running
 859          */
 860         public function restInPeace( $mode = 'fast' ) {
 861                 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 862                 // Assure deferred updates are not in the main transaction
 863                 $lbFactory->commitMasterChanges( __METHOD__ );
 864
 865                 // Loosen DB query expectations since the HTTP client is unblocked
 866                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 867                 $trxProfiler->resetExpectations();
 868                 $trxProfiler->setExpectations(
 869                         $this->config->get( 'TrxProfilerLimits' )['PostSend'],
 870                         __METHOD__
 871                 );
 872
 873                 // Do any deferred jobs
 874                 DeferredUpdates::doUpdates( 'enqueue' );
 875
 876                 // Make sure any lazy jobs are pushed
 877                 JobQueueGroup::pushLazyJobs();
 878
 879                 // Now that everything specific to this request is done,
 880                 // try to occasionally run jobs (if enabled) from the queues
 881                 if ( $mode === 'normal' ) {
 882                         $this->triggerJobs();
 883                 }
 884
 885                 // Log profiling data, e.g. in the database or UDP
 886                 wfLogProfilingData();
 887
 888                 // Commit and close up!
 889                 $lbFactory->commitMasterChanges( __METHOD__ );
 890                 $lbFactory->shutdown( LBFactory::SHUTDOWN_NO_CHRONPROT );
 891
 892                 wfDebug( "Request ended normally\n" );
 893         }
 894
 895         /**
 896          * Potentially open a socket and sent an HTTP request back to the server
 897          * to run a specified number of jobs. This registers a callback to cleanup
 898          * the socket once it's done.
 899          */
 900         public function triggerJobs() {
 901                 $jobRunRate = $this->config->get( 'JobRunRate' );
 902                 if ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 903                         return; // recursion guard
 904                 } elseif ( $jobRunRate <= 0 || wfReadOnly() ) {
 905                         return;
 906                 }
 907
 908                 if ( $jobRunRate < 1 ) {
 909                         $max = mt_getrandmax();
 910                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 911                                 return; // the higher the job run rate, the less likely we return here
 912                         }
 913                         $n = 1;
 914                 } else {
 915                         $n = intval( $jobRunRate );
 916                 }
 917
 918                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 919
 920                 // Fall back to running the job(s) while the user waits if needed
 921                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 922                         $runner = new JobRunner( $runJobsLogger );
 923                         $runner->run( [ 'maxJobs' => $n ] );
 924                         return;
 925                 }
 926
 927                 // Do not send request if there are probably no jobs
 928                 try {
 929                         $group = JobQueueGroup::singleton();
 930                         if ( !$group->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 931                                 return;
 932                         }
 933                 } catch ( JobQueueError $e ) {
 934                         MWExceptionHandler::logException( $e );
 935                         return; // do not make the site unavailable
 936                 }
 937
 938                 $query = [ 'title' => 'Special:RunJobs',
 939                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 ];
 940                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 941                         $query, $this->config->get( 'SecretKey' ) );
 942
 943                 $errno = $errstr = null;
 944                 $info = wfParseUrl( $this->config->get( 'CanonicalServer' ) );
 945                 $host = $info ? $info['host'] : null;
 946                 $port = 80;
 947                 if ( isset( $info['scheme'] ) && $info['scheme'] == 'https' ) {
 948                         $host = "tls://" . $host;
 949                         $port = 443;
 950                 }
 951                 if ( isset( $info['port'] ) ) {
 952                         $port = $info['port'];
 953                 }
 954
 955                 MediaWiki\suppressWarnings();
 956                 $sock = $host ? fsockopen(
 957                         $host,
 958                         $port,
 959                         $errno,
 960                         $errstr,
 961                         // If it takes more than 100ms to connect to ourselves there is a problem...
 962                         0.100
 963                 ) : false;
 964                 MediaWiki\restoreWarnings();
 965
 966                 $invokedWithSuccess = true;
 967                 if ( $sock ) {
 968                         $special = SpecialPageFactory::getPage( 'RunJobs' );
 969                         $url = $special->getPageTitle()->getCanonicalURL( $query );
 970                         $req = (
 971                                 "POST $url HTTP/1.1\r\n" .
 972                                 "Host: {$info['host']}\r\n" .
 973                                 "Connection: Close\r\n" .
 974                                 "Content-Length: 0\r\n\r\n"
 975                         );
 976
 977                         $runJobsLogger->info( "Running $n job(s) via '$url'" );
 978                         // Send a cron API request to be performed in the background.
 979                         // Give up if this takes too long to send (which should be rare).
 980                         stream_set_timeout( $sock, 2 );
 981                         $bytes = fwrite( $sock, $req );
 982                         if ( $bytes !== strlen( $req ) ) {
 983                                 $invokedWithSuccess = false;
 984                                 $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 985                         } else {
 986                                 // Do not wait for the response (the script should handle client aborts).
 987                                 // Make sure that we don't close before that script reaches ignore_user_abort().
 988                                 $start = microtime( true );
 989                                 $status = fgets( $sock );
 990                                 $sec = microtime( true ) - $start;
 991                                 if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 992                                         $invokedWithSuccess = false;
 993                                         $runJobsLogger->error( "Failed to start cron API: received '$status' ($sec)" );
 994                                 }
 995                         }
 996                         fclose( $sock );
 997                 } else {
 998                         $invokedWithSuccess = false;
 999                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
1000                 }
1001
1002                 // Fall back to running the job(s) while the user waits if needed
1003                 if ( !$invokedWithSuccess ) {
1004                         $runJobsLogger->warning( "Jobs switched to blocking; Special:RunJobs disabled" );
1005
1006                         $runner = new JobRunner( $runJobsLogger );
1007                         $runner->run( [ 'maxJobs'  => $n ] );
1008                 }
1009         }
1010 }