includes/Wiki.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 /**
  24  * The MediaWiki class is the helper class for the index.php entry point.
  25  *
  26  * @internal documentation reviewed 15 Mar 2010
  27  */
  28 class MediaWiki {
  29
  30         /**
  31          * TODO: fold $output, etc, into this
  32          * @var IContextSource
  33          */
  34         private $context;
  35
  36         /**
  37          * @param $x null|WebRequest
  38          * @return WebRequest
  39          */
  40         public function request( WebRequest $x = null ) {
  41                 $old = $this->context->getRequest();
  42                 $this->context->setRequest( $x );
  43                 return $old;
  44         }
  45
  46         /**
  47          * @param $x null|OutputPage
  48          * @return OutputPage
  49          */
  50         public function output( OutputPage $x = null ) {
  51                 $old = $this->context->getOutput();
  52                 $this->context->setOutput( $x );
  53                 return $old;
  54         }
  55
  56         /**
  57          * @param IContextSource|null $context
  58          */
  59         public function __construct( IContextSource $context = null ) {
  60                 if ( !$context ) {
  61                         $context = RequestContext::getMain();
  62                 }
  63
  64                 $this->context = $context;
  65                 $this->context->setTitle( $this->parseTitle() );
  66         }
  67
  68         /**
  69          * Parse the request to get the Title object
  70          *
  71          * @return Title object to be $wgTitle
  72          */
  73         private function parseTitle() {
  74                 global $wgContLang;
  75
  76                 $request = $this->context->getRequest();
  77                 $curid = $request->getInt( 'curid' );
  78                 $title = $request->getVal( 'title' );
  79                 $action = $request->getVal( 'action', 'view' );
  80
  81                 if ( $request->getCheck( 'search' ) ) {
  82                         // Compatibility with old search URLs which didn't use Special:Search
  83                         // Just check for presence here, so blank requests still
  84                         // show the search page when using ugly URLs (bug 8054).
  85                         $ret = SpecialPage::getTitleFor( 'Search' );
  86                 } elseif ( $curid ) {
  87                         // URLs like this are generated by RC, because rc_title isn't always accurate
  88                         $ret = Title::newFromID( $curid );
  89                 } elseif ( $title == '' && $action != 'delete' ) {
  90                         $ret = Title::newMainPage();
  91                 } else {
  92                         $ret = Title::newFromURL( $title );
  93                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  94                         // in wikitext links to tell Parser to make a direct file link
  95                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  96                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  97                         }
  98                         // Check variant links so that interwiki links don't have to worry
  99                         // about the possible different language variants
 100                         if ( count( $wgContLang->getVariants() ) > 1
 101                                 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 102                         {
 103                                 $wgContLang->findVariantLink( $title, $ret );
 104                         }
 105                 }
 106                 // For non-special titles, check for implicit titles
 107                 if ( is_null( $ret ) || !$ret->isSpecialPage() ) {
 108                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 109                         $oldid = $request->getInt( 'oldid' );
 110                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 111                         // Allow oldid to override a changed or missing title
 112                         if ( $oldid ) {
 113                                 $rev = Revision::newFromId( $oldid );
 114                                 $ret = $rev ? $rev->getTitle() : $ret;
 115                         }
 116                 }
 117
 118                 if ( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ) {
 119                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 120                 }
 121
 122                 return $ret;
 123         }
 124
 125         /**
 126          * Get the Title object that we'll be acting on, as specified in the WebRequest
 127          * @return Title
 128          */
 129         public function getTitle() {
 130                 if( $this->context->getTitle() === null ){
 131                         $this->context->setTitle( $this->parseTitle() );
 132                 }
 133                 return $this->context->getTitle();
 134         }
 135
 136         /**
 137          * Performs the request.
 138          * - bad titles
 139          * - read restriction
 140          * - local interwiki redirects
 141          * - redirect loop
 142          * - special pages
 143          * - normal pages
 144          *
 145          * @return void
 146          */
 147         private function performRequest() {
 148                 global $wgServer, $wgUsePathInfo, $wgTitle;
 149
 150                 wfProfileIn( __METHOD__ );
 151
 152                 $request = $this->context->getRequest();
 153                 $title = $this->context->getTitle();
 154                 $output = $this->context->getOutput();
 155                 $user = $this->context->getUser();
 156
 157                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 158                         $output->setPrintable();
 159                 }
 160
 161                 $unused = null; // To pass it by reference
 162                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 163
 164                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 165                 if ( is_null( $title ) || ( $title->getDBkey() == '' && $title->getInterwiki() == '' ) ||
 166                         $title->isSpecial( 'Badtitle' ) )
 167                 {
 168                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 169                         wfProfileOut( __METHOD__ );
 170                         throw new BadTitleError();
 171                 }
 172
 173                 // Check user's permissions to read this page.
 174                 // We have to check here to catch special pages etc.
 175                 // We will check again in Article::view().
 176                 $permErrors = $title->getUserPermissionsErrors( 'read', $user );
 177                 if ( count( $permErrors ) ) {
 178                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 179                         // $this->context->title set to the input title would allow anonymous users to
 180                         // determine whether a page exists, potentially leaking private data. In fact, the
 181                         // curid and oldid request  parameters would allow page titles to be enumerated even
 182                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 183                         // permissions error is displayed.
 184                         //
 185                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 186                         // still use $wgTitle.
 187
 188                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 189                         $this->context->setTitle( $badTitle );
 190                         $wgTitle = $badTitle;
 191
 192                         wfProfileOut( __METHOD__ );
 193                         throw new PermissionsError( 'read', $permErrors );
 194                 }
 195
 196                 $pageView = false; // was an article or special page viewed?
 197
 198                 // Interwiki redirects
 199                 if ( $title->getInterwiki() != '' ) {
 200                         $rdfrom = $request->getVal( 'rdfrom' );
 201                         if ( $rdfrom ) {
 202                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 203                         } else {
 204                                 $query = $request->getValues();
 205                                 unset( $query['title'] );
 206                                 $url = $title->getFullURL( $query );
 207                         }
 208                         // Check for a redirect loop
 209                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 210                                 && $title->isLocal() )
 211                         {
 212                                 // 301 so google et al report the target as the actual url.
 213                                 $output->redirect( $url, 301 );
 214                         } else {
 215                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 216                                 wfProfileOut( __METHOD__ );
 217                                 throw new BadTitleError();
 218                         }
 219                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 220                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 221                         && ( $request->getVal( 'title' ) === null ||
 222                                 $title->getPrefixedDBKey() != $request->getVal( 'title' ) )
 223                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 224                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) ) )
 225                 {
 226                         if ( $title->isSpecialPage() ) {
 227                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 228                                 if ( $name ) {
 229                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 230                                 }
 231                         }
 232                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 233                         // Redirect to canonical url, make it a 301 to allow caching
 234                         if ( $targetUrl == $request->getFullRequestURL() ) {
 235                                 $message = "Redirect loop detected!\n\n" .
 236                                         "This means the wiki got confused about what page was " .
 237                                         "requested; this sometimes happens when moving a wiki " .
 238                                         "to a new server or changing the server configuration.\n\n";
 239
 240                                 if ( $wgUsePathInfo ) {
 241                                         $message .= "The wiki is trying to interpret the page " .
 242                                                 "title from the URL path portion (PATH_INFO), which " .
 243                                                 "sometimes fails depending on the web server. Try " .
 244                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 245                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 246                                                 "is correct.";
 247                                 } else {
 248                                         $message .= "Your web server was detected as possibly not " .
 249                                                 "supporting URL path components (PATH_INFO) correctly; " .
 250                                                 "check your LocalSettings.php for a customized " .
 251                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 252                                                 "to true.";
 253                                 }
 254                                 throw new HttpError( 500, $message );
 255                         } else {
 256                                 $output->setSquidMaxage( 1200 );
 257                                 $output->redirect( $targetUrl, '301' );
 258                         }
 259                 // Special pages
 260                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 261                         $pageView = true;
 262                         // Actions that need to be made when we have a special pages
 263                         SpecialPageFactory::executePath( $title, $this->context );
 264                 } else {
 265                         // ...otherwise treat it as an article view. The article
 266                         // may be a redirect to another article or URL.
 267                         $article = $this->initializeArticle();
 268                         if ( is_object( $article ) ) {
 269                                 $pageView = true;
 270                                 /**
 271                                  * $wgArticle is deprecated, do not use it.
 272                                  * @deprecated since 1.18
 273                                  */
 274                                 global $wgArticle;
 275                                 $wgArticle = new DeprecatedGlobal( 'wgArticle', $article, '1.18' );
 276
 277                                 $this->performAction( $article );
 278                         } elseif ( is_string( $article ) ) {
 279                                 $output->redirect( $article );
 280                         } else {
 281                                 wfProfileOut( __METHOD__ );
 282                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
 283                         }
 284                 }
 285
 286                 if ( $pageView ) {
 287                         // Promote user to any groups they meet the criteria for
 288                         $user->addAutopromoteOnceGroups( 'onView' );
 289                 }
 290
 291                 wfProfileOut( __METHOD__ );
 292         }
 293
 294         /**
 295          * Create an Article object of the appropriate class for the given page.
 296          *
 297          * @deprecated in 1.18; use Article::newFromTitle() instead
 298          * @param $title Title
 299          * @param $context IContextSource
 300          * @return Article object
 301          */
 302         public static function articleFromTitle( $title, IContextSource $context ) {
 303                 wfDeprecated( __METHOD__, '1.18' );
 304                 return Article::newFromTitle( $title, $context );
 305         }
 306
 307         /**
 308          * Returns the name of the action that will be executed.
 309          *
 310          * @return string: action
 311          */
 312         public function getAction() {
 313                 static $action = null;
 314
 315                 if ( $action === null ) {
 316                         $action = Action::getActionName( $this->context );
 317                 }
 318
 319                 return $action;
 320         }
 321
 322         /**
 323          * Initialize the main Article object for "standard" actions (view, etc)
 324          * Create an Article object for the page, following redirects if needed.
 325          *
 326          * @return mixed an Article, or a string to redirect to another URL
 327          */
 328         private function initializeArticle() {
 329                 global $wgDisableHardRedirects;
 330
 331                 wfProfileIn( __METHOD__ );
 332
 333                 $title = $this->context->getTitle();
 334                 $article = Article::newFromTitle( $title, $this->context );
 335                 $this->context->setWikiPage( $article->getPage() );
 336                 // NS_MEDIAWIKI has no redirects.
 337                 // It is also used for CSS/JS, so performance matters here...
 338                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 339                         wfProfileOut( __METHOD__ );
 340                         return $article;
 341                 }
 342
 343                 $request = $this->context->getRequest();
 344
 345                 // Namespace might change when using redirects
 346                 // Check for redirects ...
 347                 $action = $request->getVal( 'action', 'view' );
 348                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 349                 if ( ( $action == 'view' || $action == 'render' )       // ... for actions that show content
 350                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 351                         !$request->getVal( 'diff' ) &&    // ... and not when showing diff
 352                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 353                         // ... and the article is not a non-redirect image page with associated file
 354                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 355                 {
 356                         // Give extensions a change to ignore/handle redirects as needed
 357                         $ignoreRedirect = $target = false;
 358
 359                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 360                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 361
 362                         // Follow redirects only for... redirects.
 363                         // If $target is set, then a hook wanted to redirect.
 364                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 365                                 // Is the target already set by an extension?
 366                                 $target = $target ? $target : $article->followRedirect();
 367                                 if ( is_string( $target ) ) {
 368                                         if ( !$wgDisableHardRedirects ) {
 369                                                 // we'll need to redirect
 370                                                 wfProfileOut( __METHOD__ );
 371                                                 return $target;
 372                                         }
 373                                 }
 374                                 if ( is_object( $target ) ) {
 375                                         // Rewrite environment to redirected article
 376                                         $rarticle = Article::newFromTitle( $target, $this->context );
 377                                         $rarticle->loadPageData();
 378                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 379                                                 $rarticle->setRedirectedFrom( $title );
 380                                                 $article = $rarticle;
 381                                                 $this->context->setTitle( $target );
 382                                                 $this->context->setWikiPage( $article->getPage() );
 383                                         }
 384                                 }
 385                         } else {
 386                                 $this->context->setTitle( $article->getTitle() );
 387                                 $this->context->setWikiPage( $article->getPage() );
 388                         }
 389                 }
 390
 391                 wfProfileOut( __METHOD__ );
 392                 return $article;
 393         }
 394
 395         /**
 396          * Cleaning up request by doing deferred updates, DB transaction, and the output
 397          */
 398         public function finalCleanup() {
 399                 wfProfileIn( __METHOD__ );
 400                 // Now commit any transactions, so that unreported errors after
 401                 // output() don't roll back the whole DB transaction
 402                 $factory = wfGetLBFactory();
 403                 $factory->commitMasterChanges();
 404                 // Output everything!
 405                 $this->context->getOutput()->output();
 406                 // Do any deferred jobs
 407                 DeferredUpdates::doUpdates( 'commit' );
 408                 $this->doJobs();
 409                 wfProfileOut( __METHOD__ );
 410         }
 411
 412         /**
 413          * Do a job from the job queue
 414          */
 415         private function doJobs() {
 416                 global $wgJobRunRate;
 417
 418                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 419                         return;
 420                 }
 421                 if ( $wgJobRunRate < 1 ) {
 422                         $max = mt_getrandmax();
 423                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 424                                 return;
 425                         }
 426                         $n = 1;
 427                 } else {
 428                         $n = intval( $wgJobRunRate );
 429                 }
 430
 431                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 432                         $output = $job->toString() . "\n";
 433                         $t = - microtime( true );
 434                         $success = $job->run();
 435                         $t += microtime( true );
 436                         $t = round( $t * 1000 );
 437                         if ( !$success ) {
 438                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 439                         } else {
 440                                 $output .= "Success, Time: $t ms\n";
 441                         }
 442                         wfDebugLog( 'jobqueue', $output );
 443                 }
 444         }
 445
 446         /**
 447          * Ends this task peacefully
 448          */
 449         public function restInPeace() {
 450                 MessageCache::logMessages();
 451                 wfLogProfilingData();
 452                 // Commit and close up!
 453                 $factory = wfGetLBFactory();
 454                 $factory->commitMasterChanges();
 455                 $factory->shutdown();
 456                 wfDebug( "Request ended normally\n" );
 457         }
 458
 459         /**
 460          * Perform one of the "standard" actions
 461          *
 462          * @param $page Page
 463          */
 464         private function performAction( Page $page ) {
 465                 wfProfileIn( __METHOD__ );
 466
 467                 $request = $this->context->getRequest();
 468                 $output = $this->context->getOutput();
 469                 $title = $this->context->getTitle();
 470                 $user = $this->context->getUser();
 471
 472                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 473                         array( $output, $page, $title, $user, $request, $this ) ) )
 474                 {
 475                         wfProfileOut( __METHOD__ );
 476                         return;
 477                 }
 478
 479                 $act = $this->getAction();
 480
 481                 $action = Action::factory( $act, $page );
 482                 if ( $action instanceof Action ) {
 483                         $action->show();
 484                         wfProfileOut( __METHOD__ );
 485                         return;
 486                 }
 487
 488                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 489                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 490                 }
 491
 492                 wfProfileOut( __METHOD__ );
 493         }
 494
 495         /**
 496          * Run the current MediaWiki instance
 497          * index.php just calls this
 498          */
 499         public function run() {
 500                 try {
 501                         $this->checkMaxLag();
 502                         $this->main();
 503                         $this->restInPeace();
 504                 } catch ( Exception $e ) {
 505                         MWExceptionHandler::handle( $e );
 506                 }
 507         }
 508
 509         /**
 510          * Checks if the request should abort due to a lagged server,
 511          * for given maxlag parameter.
 512          * @return bool
 513          */
 514         private function checkMaxLag() {
 515                 global $wgShowHostnames;
 516
 517                 wfProfileIn( __METHOD__ );
 518                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 519                 if ( !is_null( $maxLag ) ) {
 520                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 521                         if ( $lag > $maxLag ) {
 522                                 $resp = $this->context->getRequest()->response();
 523                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 524                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 525                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 526                                 $resp->header( 'Content-Type: text/plain' );
 527                                 if( $wgShowHostnames ) {
 528                                         echo "Waiting for $host: $lag seconds lagged\n";
 529                                 } else {
 530                                         echo "Waiting for a database server: $lag seconds lagged\n";
 531                                 }
 532
 533                                 wfProfileOut( __METHOD__ );
 534
 535                                 exit;
 536                         }
 537                 }
 538                 wfProfileOut( __METHOD__ );
 539                 return true;
 540         }
 541
 542         private function main() {
 543                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 544
 545                 wfProfileIn( __METHOD__ );
 546
 547                 $request = $this->context->getRequest();
 548
 549                 // Send Ajax requests to the Ajax dispatcher.
 550                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 551
 552                         // Set a dummy title, because $wgTitle == null might break things
 553                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 554                         $this->context->setTitle( $title );
 555                         $wgTitle = $title;
 556
 557                         $dispatcher = new AjaxDispatcher();
 558                         $dispatcher->performAction();
 559                         wfProfileOut( __METHOD__ );
 560                         return;
 561                 }
 562
 563                 // Get title from request parameters,
 564                 // is set on the fly by parseTitle the first time.
 565                 $title = $this->getTitle();
 566                 $action = $this->getAction();
 567                 $wgTitle = $title;
 568
 569                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 570                         wfProfileIn( 'main-try-filecache' );
 571                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 572                                 // Try low-level file cache hit
 573                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 574                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 575                                         // Check incoming headers to see if client has this cached
 576                                         $timestamp = $cache->cacheTimestamp();
 577                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 578                                                 $cache->loadFromFileCache( $this->context );
 579                                         }
 580                                         // Do any stats increment/watchlist stuff
 581                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 582                                         // Tell OutputPage that output is taken care of
 583                                         $this->context->getOutput()->disable();
 584                                         wfProfileOut( 'main-try-filecache' );
 585                                         wfProfileOut( __METHOD__ );
 586                                         return;
 587                                 }
 588                         }
 589                         wfProfileOut( 'main-try-filecache' );
 590                 }
 591
 592                 $this->performRequest();
 593                 $this->finalCleanup();
 594
 595                 wfProfileOut( __METHOD__ );
 596         }
 597 }