includes/Wiki.php

   1 <?php
   2 /**
   3  * MediaWiki is the to-be base class for this whole project
   4  */
   5 class MediaWiki {
   6
   7         var $GET; /* Stores the $_GET variables at time of creation, can be changed */
   8         var $params = array();
   9
  10         /** Constructor. It just save the $_GET variable */
  11         function __construct() {
  12                 $this->GET = $_GET;
  13         }
  14
  15         /**
  16          * Stores key/value pairs to circumvent global variables
  17          * Note that keys are case-insensitive!
  18          *
  19          * @param $key String: key to store
  20          * @param $value Mixed: value to put for the key
  21          */
  22         function setVal( $key, &$value ) {
  23                 $key = strtolower( $key );
  24                 $this->params[$key] =& $value;
  25         }
  26
  27         /**
  28          * Retrieves key/value pairs to circumvent global variables
  29          * Note that keys are case-insensitive!
  30          *
  31          * @param $key String: key to get
  32          * @param $default Mixed: default value if if the key doesn't exist
  33          */
  34         function getVal( $key, $default = '' ) {
  35                 $key = strtolower( $key );
  36                 if( isset( $this->params[$key] ) ) {
  37                         return $this->params[$key];
  38                 }
  39                 return $default;
  40         }
  41
  42         /**
  43          * Initialization of ... everything
  44          * Performs the request too
  45          *
  46          * @param $title Title ($wgTitle)
  47          * @param $article Article
  48          * @param $output OutputPage
  49          * @param $user User
  50          * @param $request WebRequest
  51          */
  52         function initialize( &$title, &$article, &$output, &$user, $request ) {
  53                 wfProfileIn( __METHOD__ );
  54                 $this->preliminaryChecks( $title, $output, $request );
  55                 if( !$this->initializeSpecialCases( $title, $output, $request ) ) {
  56                         $new_article = $this->initializeArticle( $title, $request );
  57                         if( is_object( $new_article ) ) {
  58                                 $article = $new_article;
  59                                 $this->performAction( $output, $article, $title, $user, $request );
  60                         } elseif( is_string( $new_article ) ) {
  61                                 $output->redirect( $new_article );
  62                         } else {
  63                                 wfProfileOut( __METHOD__ );
  64                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
  65                         }
  66                 }
  67                 wfProfileOut( __METHOD__ );
  68         }
  69
  70         /**
  71          * Check if the maximum lag of database slaves is higher that $maxLag, and
  72          * if it's the case, output an error message
  73          *
  74          * @param $maxLag int: maximum lag allowed for the request, as supplied by
  75          *                the client
  76          * @return bool true if the request can continue
  77          */
  78         function checkMaxLag( $maxLag ) {
  79                 list( $host, $lag ) = wfGetLB()->getMaxLag();
  80                 if( $lag > $maxLag ) {
  81                         wfMaxlagError( $host, $lag, $maxLag );
  82                         return false;
  83                 } else {
  84                         return true;
  85                 }
  86         }
  87
  88
  89         /**
  90          * Checks some initial queries
  91          * Note that $title here is *not* a Title object, but a string!
  92          *
  93          * @param $title String
  94          * @param $action String
  95          * @return Title object to be $wgTitle
  96          */
  97         function checkInitialQueries( $title, $action ) {
  98                 global $wgOut, $wgRequest, $wgContLang;
  99                 if( $wgRequest->getVal( 'printable' ) === 'yes' ) {
 100                         $wgOut->setPrintable();
 101                 }
 102                 $ret = NULL;
 103                 if( $curid = $wgRequest->getInt( 'curid' ) ) {
 104                         # URLs like this are generated by RC, because rc_title isn't always accurate
 105                         $ret = Title::newFromID( $curid );
 106                 } elseif( '' == $title && 'delete' != $action ) {
 107                         $ret = Title::newMainPage();
 108                 } else {
 109                         $ret = Title::newFromURL( $title );
 110                         // check variant links so that interwiki links don't have to worry
 111                         // about the possible different language variants
 112                         if( count( $wgContLang->getVariants() ) > 1 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 113                                 $wgContLang->findVariantLink( $title, $ret );
 114
 115                 }
 116                 if( ( $oldid = $wgRequest->getInt( 'oldid' ) )
 117                         && ( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) ) {
 118                         // Allow oldid to override a changed or missing title.
 119                         $rev = Revision::newFromId( $oldid );
 120                         if( $rev ) {
 121                                 $ret = $rev->getTitle();
 122                         }
 123                 }
 124                 return $ret;
 125         }
 126
 127         /**
 128          * Checks for search query and anon-cannot-read case
 129          *
 130          * @param $title Title
 131          * @param $output OutputPage
 132          * @param $request WebRequest
 133          */
 134         function preliminaryChecks( &$title, &$output, $request ) {
 135                 if( $request->getCheck( 'search' ) ) {
 136                         // Compatibility with old search URLs which didn't use Special:Search
 137                         // Just check for presence here, so blank requests still
 138                         // show the search page when using ugly URLs (bug 8054).
 139
 140                         // Do this above the read whitelist check for security...
 141                         $title = SpecialPage::getTitleFor( 'Search' );
 142                 }
 143                 # If the user is not logged in, the Namespace:title of the article must be in
 144                 # the Read array in order for the user to see it. (We have to check here to
 145                 # catch special pages etc. We check again in Article::view())
 146                 if( !is_null( $title ) && !$title->userCanRead() ) {
 147                         $output->loginToUse();
 148                         $output->output();
 149                         exit;
 150                 }
 151         }
 152
 153         /**
 154          * Initialize some special cases:
 155          * - bad titles
 156          * - local interwiki redirects
 157          * - redirect loop
 158          * - special pages
 159          *
 160          * @param $title Title
 161          * @param $output OutputPage
 162          * @param $request WebRequest
 163          * @return bool true if the request is already executed
 164          */
 165         function initializeSpecialCases( &$title, &$output, $request ) {
 166                 wfProfileIn( __METHOD__ );
 167
 168                 $action = $this->getVal( 'Action' );
 169                 if( is_null($title) || $title->getDBkey() == '' ) {
 170                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 171                         # Die now before we mess up $wgArticle and the skin stops working
 172                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 173                 } else if( $title->getInterwiki() != '' ) {
 174                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 175                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 176                         } else {
 177                                 $url = $title->getFullURL();
 178                         }
 179                         /* Check for a redirect loop */
 180                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 181                                 $output->redirect( $url );
 182                         } else {
 183                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 184                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 185                         }
 186                 } else if( $action == 'view' && !$request->wasPosted() &&
 187                         ( !isset($this->GET['title']) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
 188                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 189                 {
 190                         $targetUrl = $title->getFullURL();
 191                         // Redirect to canonical url, make it a 301 to allow caching
 192                         if( $targetUrl == $request->getFullRequestURL() ) {
 193                                 $message = "Redirect loop detected!\n\n" .
 194                                         "This means the wiki got confused about what page was " .
 195                                         "requested; this sometimes happens when moving a wiki " .
 196                                         "to a new server or changing the server configuration.\n\n";
 197
 198                                 if( $this->getVal( 'UsePathInfo' ) ) {
 199                                         $message .= "The wiki is trying to interpret the page " .
 200                                                 "title from the URL path portion (PATH_INFO), which " .
 201                                                 "sometimes fails depending on the web server. Try " .
 202                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 203                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 204                                                 "is correct.";
 205                                 } else {
 206                                         $message .= "Your web server was detected as possibly not " .
 207                                                 "supporting URL path components (PATH_INFO) correctly; " .
 208                                                 "check your LocalSettings.php for a customized " .
 209                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 210                                                 "to true.";
 211                                 }
 212                                 wfHttpError( 500, "Internal error", $message );
 213                                 return false;
 214                         } else {
 215                                 $output->setSquidMaxage( 1200 );
 216                                 $output->redirect( $targetUrl, '301' );
 217                         }
 218                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 219                         /* actions that need to be made when we have a special pages */
 220                         SpecialPage::executePath( $title );
 221                 } else {
 222                         /* Try low-level file cache hit */
 223                         if( $title->getNamespace() != NS_MEDIAWIKI && HTMLFileCache::useFileCache() ) {
 224                                 $cache = new HTMLFileCache( $title );
 225                                 if( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 226                                         global $wgOut;
 227                                         /* Check incoming headers to see if client has this cached */
 228                                         if( !$wgOut->checkLastModified( $cache->fileCacheTime() ) ) {
 229                                                 wfDebug( "MediaWiki::initializeSpecialCases(): about to load file cache\n" );
 230                                                 $cache->loadFromFileCache();
 231                                                 # Tell $wgOut that output is taken care of
 232                                                 $wgOut->disable();
 233                                                 # Do any stats increment/watchlist stuff
 234                                                 $article = self::articleFromTitle( $title );
 235                                                 $article->viewUpdates();
 236                                         }
 237                                         wfProfileOut( __METHOD__ );
 238                                         return true;
 239                                 }
 240                         }
 241                         /* No match to special cases */
 242                         wfProfileOut( __METHOD__ );
 243                         return false;
 244                 }
 245                 /* Did match a special case */
 246                 wfProfileOut( __METHOD__ );
 247                 return true;
 248         }
 249
 250         /**
 251          * Create an Article object of the appropriate class for the given page.
 252          *
 253          * @param $title Title
 254          * @return Article object
 255          */
 256         static function articleFromTitle( &$title ) {
 257                 if( NS_MEDIA == $title->getNamespace() ) {
 258                         // FIXME: where should this go?
 259                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 260                 }
 261
 262                 $article = null;
 263                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 264                 if( $article ) {
 265                         return $article;
 266                 }
 267
 268                 switch( $title->getNamespace() ) {
 269                         case NS_FILE:
 270                                 return new ImagePage( $title );
 271                         case NS_CATEGORY:
 272                                 return new CategoryPage( $title );
 273                         default:
 274                                 return new Article( $title );
 275                 }
 276         }
 277
 278         /**
 279          * Initialize the object to be known as $wgArticle for "standard" actions
 280          * Create an Article object for the page, following redirects if needed.
 281          *
 282          * @param $title Title ($wgTitle)
 283          * @param $request WebRequest
 284          * @return mixed an Article, or a string to redirect to another URL
 285          */
 286         function initializeArticle( &$title, $request ) {
 287                 wfProfileIn( __METHOD__ );
 288
 289                 $action = $this->getVal( 'action' );
 290                 $article = self::articleFromTitle( $title );
 291
 292                 // Namespace might change when using redirects
 293                 // Check for redirects ...
 294                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 295                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 296                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 297                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 298                         // ... and the article is not a non-redirect image page with associated file
 299                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 300                 {
 301                         # Give extensions a change to ignore/handle redirects as needed
 302                         $ignoreRedirect = $target = false;
 303
 304                         $dbr = wfGetDB( DB_SLAVE );
 305                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 306
 307                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 308                                 array(&$title,&$request,&$ignoreRedirect,&$target,&$article) );
 309
 310                         // Follow redirects only for... redirects
 311                         if( !$ignoreRedirect && $article->isRedirect() ) {
 312                                 # Is the target already set by an extension?
 313                                 $target = $target ? $target : $article->followRedirect();
 314                                 if( is_string( $target ) ) {
 315                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 316                                                 // we'll need to redirect
 317                                                 return $target;
 318                                         }
 319                                 }
 320
 321                                 if( is_object( $target ) ) {
 322                                         // Rewrite environment to redirected article
 323                                         $rarticle = self::articleFromTitle( $target );
 324                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 325                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 326                                                 $rarticle->setRedirectedFrom( $title );
 327                                                 $article = $rarticle;
 328                                                 $title = $target;
 329                                         }
 330                                 }
 331                         } else {
 332                                 $title = $article->getTitle();
 333                         }
 334                 }
 335                 wfProfileOut( __METHOD__ );
 336                 return $article;
 337         }
 338
 339         /**
 340          * Cleaning up by doing deferred updates, calling LBFactory and doing the output
 341          *
 342          * @param $deferredUpdates array of updates to do
 343          * @param $output OutputPage
 344          */
 345         function finalCleanup( &$deferredUpdates, &$output ) {
 346                 wfProfileIn( __METHOD__ );
 347                 # Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
 348                 $factory = wfGetLBFactory();
 349                 $factory->commitMasterChanges();
 350                 # Output everything!
 351                 $output->output();
 352                 # Do any deferred jobs
 353                 $this->doUpdates( $deferredUpdates );
 354                 $this->doJobs();
 355                 # Commit and close up!
 356                 $factory->shutdown();
 357                 wfProfileOut( __METHOD__ );
 358         }
 359
 360         /**
 361          * Deferred updates aren't really deferred anymore. It's important to report
 362          * errors to the user, and that means doing this before OutputPage::output().
 363          * Note that for page saves, the client will wait until the script exits
 364          * anyway before following the redirect.
 365          *
 366          * @param $updates array of objects that hold an update to do
 367          */
 368         function doUpdates( &$updates ) {
 369                 wfProfileIn( __METHOD__ );
 370                 /* No need to get master connections in case of empty updates array */
 371                 if (!$updates) {
 372                         wfProfileOut( __METHOD__ );
 373                         return;
 374                 }
 375
 376                 $dbw = wfGetDB( DB_MASTER );
 377                 foreach( $updates as $up ) {
 378                         $up->doUpdate();
 379
 380                         # Commit after every update to prevent lock contention
 381                         if( $dbw->trxLevel() ) {
 382                                 $dbw->commit();
 383                         }
 384                 }
 385                 wfProfileOut( __METHOD__ );
 386         }
 387
 388         /**
 389          * Do a job from the job queue
 390          */
 391         function doJobs() {
 392                 $jobRunRate = $this->getVal( 'JobRunRate' );
 393
 394                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 395                         return;
 396                 }
 397                 if( $jobRunRate < 1 ) {
 398                         $max = mt_getrandmax();
 399                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 400                                 return;
 401                         }
 402                         $n = 1;
 403                 } else {
 404                         $n = intval( $jobRunRate );
 405                 }
 406
 407                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 408                         $output = $job->toString() . "\n";
 409                         $t = -wfTime();
 410                         $success = $job->run();
 411                         $t += wfTime();
 412                         $t = round( $t*1000 );
 413                         if( !$success ) {
 414                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 415                         } else {
 416                                 $output .= "Success, Time: $t ms\n";
 417                         }
 418                         wfDebugLog( 'jobqueue', $output );
 419                 }
 420         }
 421
 422         /**
 423          * Ends this task peacefully
 424          */
 425         function restInPeace() {
 426                 wfLogProfilingData();
 427                 wfDebug( "Request ended normally\n" );
 428         }
 429
 430         /**
 431          * Perform one of the "standard" actions
 432          *
 433          * @param $output OutputPage
 434          * @param $article Article
 435          * @param $title Title
 436          * @param $user User
 437          * @param $request WebRequest
 438          */
 439         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 440                 wfProfileIn( __METHOD__ );
 441
 442                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 443                         wfProfileOut( __METHOD__ );
 444                         return;
 445                 }
 446
 447                 $action = $this->getVal( 'Action' );
 448                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 449                         /* No such action; this will switch to the default case */
 450                         $action = 'nosuchaction';
 451                 }
 452
 453                 switch( $action ) {
 454                         case 'view':
 455                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 456                                 $article->view();
 457                                 break;
 458                         case 'raw': // includes JS/CSS
 459                                 $raw = new RawPage( $article );
 460                                 $raw->view();
 461                                 break;
 462                         case 'watch':
 463                         case 'unwatch':
 464                         case 'delete':
 465                         case 'revert':
 466                         case 'rollback':
 467                         case 'protect':
 468                         case 'unprotect':
 469                         case 'info':
 470                         case 'markpatrolled':
 471                         case 'render':
 472                         case 'deletetrackback':
 473                         case 'purge':
 474                                 $article->$action();
 475                                 break;
 476                         case 'print':
 477                                 $article->view();
 478                                 break;
 479                         case 'dublincore':
 480                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 481                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 482                                 } else {
 483                                         $rdf = new DublinCoreRdf( $article );
 484                                         $rdf->show();
 485                                 }
 486                                 break;
 487                         case 'creativecommons':
 488                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 489                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 490                                 } else {
 491                                         $rdf = new CreativeCommonsRdf( $article );
 492                                         $rdf->show();
 493                                 }
 494                                 break;
 495                         case 'credits':
 496                                 Credits::showPage( $article );
 497                                 break;
 498                         case 'submit':
 499                                 if( session_id() == '' ) {
 500                                         /* Send a cookie so anons get talk message notifications */
 501                                         wfSetupSession();
 502                                 }
 503                                 /* Continue... */
 504                         case 'edit':
 505                         case 'editredlink':
 506                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 507                                         $internal = $request->getVal( 'internaledit' );
 508                                         $external = $request->getVal( 'externaledit' );
 509                                         $section = $request->getVal( 'section' );
 510                                         $oldid = $request->getVal( 'oldid' );
 511                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 512                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 513                                                 $editor = new EditPage( $article );
 514                                                 $editor->submit();
 515                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 516                                                 $mode = $request->getVal( 'mode' );
 517                                                 $extedit = new ExternalEdit( $article, $mode );
 518                                                 $extedit->edit();
 519                                         }
 520                                 }
 521                                 break;
 522                         case 'history':
 523                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 524                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 525                                 }
 526                                 $history = new PageHistory( $article );
 527                                 $history->history();
 528                                 break;
 529                         default:
 530                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 531                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 532                                 }
 533                 }
 534                 wfProfileOut( __METHOD__ );
 535
 536         }
 537
 538 }; /* End of class MediaWiki */