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
 136                 if( $request->getCheck( 'search' ) ) {
 137                         // Compatibility with old search URLs which didn't use Special:Search
 138                         // Just check for presence here, so blank requests still
 139                         // show the search page when using ugly URLs (bug 8054).
 140
 141                         // Do this above the read whitelist check for security...
 142                         $title = SpecialPage::getTitleFor( 'Search' );
 143                 }
 144
 145                 # If the user is not logged in, the Namespace:title of the article must be in
 146                 # the Read array in order for the user to see it. (We have to check here to
 147                 # catch special pages etc. We check again in Article::view())
 148                 if( !is_null( $title ) && !$title->userCanRead() ) {
 149                         $output->loginToUse();
 150                         $output->output();
 151                         exit;
 152                 }
 153
 154         }
 155
 156         /**
 157          * Initialize some special cases:
 158          * - bad titles
 159          * - local interwiki redirects
 160          * - redirect loop
 161          * - special pages
 162          *
 163          * @param $title Title
 164          * @param $output OutputPage
 165          * @param $request WebRequest
 166          * @return bool true if the request is already executed
 167          */
 168         function initializeSpecialCases( &$title, &$output, $request ) {
 169                 wfProfileIn( __METHOD__ );
 170
 171                 $action = $this->getVal( 'Action' );
 172                 if( is_null($title) || $title->getDBkey() == '' ) {
 173                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 174                         # Die now before we mess up $wgArticle and the skin stops working
 175                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 176                 } else if( $title->getInterwiki() != '' ) {
 177                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 178                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 179                         } else {
 180                                 $url = $title->getFullURL();
 181                         }
 182                         /* Check for a redirect loop */
 183                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 184                                 $output->redirect( $url );
 185                         } else {
 186                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 187                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 188                         }
 189                 } else if( $action == 'view' && !$request->wasPosted() &&
 190                         ( !isset($this->GET['title']) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
 191                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 192                 {
 193                         $targetUrl = $title->getFullURL();
 194                         // Redirect to canonical url, make it a 301 to allow caching
 195                         if( $targetUrl == $request->getFullRequestURL() ) {
 196                                 $message = "Redirect loop detected!\n\n" .
 197                                         "This means the wiki got confused about what page was " .
 198                                         "requested; this sometimes happens when moving a wiki " .
 199                                         "to a new server or changing the server configuration.\n\n";
 200
 201                                 if( $this->getVal( 'UsePathInfo' ) ) {
 202                                         $message .= "The wiki is trying to interpret the page " .
 203                                                 "title from the URL path portion (PATH_INFO), which " .
 204                                                 "sometimes fails depending on the web server. Try " .
 205                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 206                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 207                                                 "is correct.";
 208                                 } else {
 209                                         $message .= "Your web server was detected as possibly not " .
 210                                                 "supporting URL path components (PATH_INFO) correctly; " .
 211                                                 "check your LocalSettings.php for a customized " .
 212                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 213                                                 "to true.";
 214                                 }
 215                                 wfHttpError( 500, "Internal error", $message );
 216                                 return false;
 217                         } else {
 218                                 $output->setSquidMaxage( 1200 );
 219                                 $output->redirect( $targetUrl, '301' );
 220                         }
 221                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 222                         /* actions that need to be made when we have a special pages */
 223                         SpecialPage::executePath( $title );
 224                 } else {
 225                         /* Try low-level file cache hit */
 226                         if( $title->getNamespace() != NS_MEDIAWIKI && HTMLFileCache::useFileCache() ) {
 227                                 $cache = new HTMLFileCache( $title );
 228                                 if( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 229                                         global $wgOut;
 230                                         /* Check incoming headers to see if client has this cached */
 231                                         if( !$wgOut->checkLastModified( $cache->fileCacheTime() ) ) {
 232                                                 wfDebug( "MediaWiki::initializeSpecialCases(): about to load file cache\n" );
 233                                                 $cache->loadFromFileCache();
 234                                                 # Tell $wgOut that output is taken care of
 235                                                 $wgOut->disable();
 236                                                 # Do any stats increment/watchlist stuff
 237                                                 $article = self::articleFromTitle( $title );
 238                                                 $article->viewUpdates();
 239                                         }
 240                                         wfProfileOut( __METHOD__ );
 241                                         return true;
 242                                 }
 243                         }
 244                         /* No match to special cases */
 245                         wfProfileOut( __METHOD__ );
 246                         return false;
 247                 }
 248                 /* Did match a special case */
 249                 wfProfileOut( __METHOD__ );
 250                 return true;
 251         }
 252
 253         /**
 254          * Create an Article object of the appropriate class for the given page.
 255          *
 256          * @param $title Title
 257          * @return Article object
 258          */
 259         static function articleFromTitle( &$title ) {
 260                 if( NS_MEDIA == $title->getNamespace() ) {
 261                         // FIXME: where should this go?
 262                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 263                 }
 264
 265                 $article = null;
 266                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 267                 if( $article ) {
 268                         return $article;
 269                 }
 270
 271                 switch( $title->getNamespace() ) {
 272                         case NS_FILE:
 273                                 return new ImagePage( $title );
 274                         case NS_CATEGORY:
 275                                 return new CategoryPage( $title );
 276                         default:
 277                                 return new Article( $title );
 278                 }
 279         }
 280
 281         /**
 282          * Initialize the object to be known as $wgArticle for "standard" actions
 283          * Create an Article object for the page, following redirects if needed.
 284          *
 285          * @param $title Title ($wgTitle)
 286          * @param $request WebRequest
 287          * @return mixed an Article, or a string to redirect to another URL
 288          */
 289         function initializeArticle( &$title, $request ) {
 290                 wfProfileIn( __METHOD__ );
 291
 292                 $action = $this->getVal( 'action' );
 293                 $article = self::articleFromTitle( $title );
 294
 295                 // Namespace might change when using redirects
 296                 // Check for redirects ...
 297                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 298                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 299                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 300                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 301                         // ... and the article is not a non-redirect image page with associated file
 302                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 303                 {
 304                         # Give extensions a change to ignore/handle redirects as needed
 305                         $ignoreRedirect = $target = false;
 306
 307                         $dbr = wfGetDB( DB_SLAVE );
 308                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 309
 310                         wfRunHooks( 'InitializeArticleMaybeRedirect', array( &$title, &$request, &$ignoreRedirect, &$target ) );
 311
 312                         // Follow redirects only for... redirects
 313                         if( !$ignoreRedirect && $article->isRedirect() ) {
 314                                 # Is the target already set by an extension?
 315                                 $target = $target ? $target : $article->followRedirect();
 316                                 if( is_string( $target ) ) {
 317                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 318                                                 // we'll need to redirect
 319                                                 return $target;
 320                                         }
 321                                 }
 322
 323                                 if( is_object( $target ) ) {
 324                                         // Rewrite environment to redirected article
 325                                         $rarticle = self::articleFromTitle( $target );
 326                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 327                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 328                                                 $rarticle->setRedirectedFrom( $title );
 329                                                 $article = $rarticle;
 330                                                 $title = $target;
 331                                         }
 332                                 }
 333                         } else {
 334                                 $title = $article->getTitle();
 335                         }
 336                 }
 337                 wfProfileOut( __METHOD__ );
 338                 return $article;
 339         }
 340
 341         /**
 342          * Cleaning up by doing deferred updates, calling LBFactory and doing the output
 343          *
 344          * @param $deferredUpdates array of updates to do
 345          * @param $output OutputPage
 346          */
 347         function finalCleanup( &$deferredUpdates, &$output ) {
 348                 wfProfileIn( __METHOD__ );
 349                 # Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
 350                 $factory = wfGetLBFactory();
 351                 $factory->commitMasterChanges();
 352                 # Output everything!
 353                 $output->output();
 354                 # Do any deferred jobs
 355                 $this->doUpdates( $deferredUpdates );
 356                 $this->doJobs();
 357                 # Commit and close up!
 358                 $factory->shutdown();
 359                 wfProfileOut( __METHOD__ );
 360         }
 361
 362         /**
 363          * Deferred updates aren't really deferred anymore. It's important to report
 364          * errors to the user, and that means doing this before OutputPage::output().
 365          * Note that for page saves, the client will wait until the script exits
 366          * anyway before following the redirect.
 367          *
 368          * @param $updates array of objects that hold an update to do
 369          */
 370         function doUpdates( &$updates ) {
 371                 wfProfileIn( __METHOD__ );
 372                 /* No need to get master connections in case of empty updates array */
 373                 if (!$updates) {
 374                         wfProfileOut( __METHOD__ );
 375                         return;
 376                 }
 377
 378                 $dbw = wfGetDB( DB_MASTER );
 379                 foreach( $updates as $up ) {
 380                         $up->doUpdate();
 381
 382                         # Commit after every update to prevent lock contention
 383                         if( $dbw->trxLevel() ) {
 384                                 $dbw->commit();
 385                         }
 386                 }
 387                 wfProfileOut( __METHOD__ );
 388         }
 389
 390         /**
 391          * Do a job from the job queue
 392          */
 393         function doJobs() {
 394                 $jobRunRate = $this->getVal( 'JobRunRate' );
 395
 396                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 397                         return;
 398                 }
 399                 if( $jobRunRate < 1 ) {
 400                         $max = mt_getrandmax();
 401                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 402                                 return;
 403                         }
 404                         $n = 1;
 405                 } else {
 406                         $n = intval( $jobRunRate );
 407                 }
 408
 409                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 410                         $output = $job->toString() . "\n";
 411                         $t = -wfTime();
 412                         $success = $job->run();
 413                         $t += wfTime();
 414                         $t = round( $t*1000 );
 415                         if( !$success ) {
 416                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 417                         } else {
 418                                 $output .= "Success, Time: $t ms\n";
 419                         }
 420                         wfDebugLog( 'jobqueue', $output );
 421                 }
 422         }
 423
 424         /**
 425          * Ends this task peacefully
 426          */
 427         function restInPeace() {
 428                 wfLogProfilingData();
 429                 wfDebug( "Request ended normally\n" );
 430         }
 431
 432         /**
 433          * Perform one of the "standard" actions
 434          *
 435          * @param $output OutputPage
 436          * @param $article Article
 437          * @param $title Title
 438          * @param $user User
 439          * @param $request WebRequest
 440          */
 441         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 442                 wfProfileIn( __METHOD__ );
 443
 444                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 445                         wfProfileOut( __METHOD__ );
 446                         return;
 447                 }
 448
 449                 $action = $this->getVal( 'Action' );
 450                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 451                         /* No such action; this will switch to the default case */
 452                         $action = 'nosuchaction';
 453                 }
 454
 455                 switch( $action ) {
 456                         case 'view':
 457                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 458                                 $article->view();
 459                                 break;
 460                         case 'raw': // includes JS/CSS
 461                                 $raw = new RawPage( $article );
 462                                 $raw->view();
 463                                 break;
 464                         case 'watch':
 465                         case 'unwatch':
 466                         case 'delete':
 467                         case 'revert':
 468                         case 'rollback':
 469                         case 'protect':
 470                         case 'unprotect':
 471                         case 'info':
 472                         case 'markpatrolled':
 473                         case 'render':
 474                         case 'deletetrackback':
 475                         case 'purge':
 476                                 $article->$action();
 477                                 break;
 478                         case 'print':
 479                                 $article->view();
 480                                 break;
 481                         case 'dublincore':
 482                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 483                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 484                                 } else {
 485                                         $rdf = new DublinCoreRdf( $article );
 486                                         $rdf->show();
 487                                 }
 488                                 break;
 489                         case 'creativecommons':
 490                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 491                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 492                                 } else {
 493                                         $rdf = new CreativeCommonsRdf( $article );
 494                                         $rdf->show();
 495                                 }
 496                                 break;
 497                         case 'credits':
 498                                 Credits::showPage( $article );
 499                                 break;
 500                         case 'submit':
 501                                 if( session_id() == '' ) {
 502                                         /* Send a cookie so anons get talk message notifications */
 503                                         wfSetupSession();
 504                                 }
 505                                 /* Continue... */
 506                         case 'edit':
 507                         case 'editredlink':
 508                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 509                                         $internal = $request->getVal( 'internaledit' );
 510                                         $external = $request->getVal( 'externaledit' );
 511                                         $section = $request->getVal( 'section' );
 512                                         $oldid = $request->getVal( 'oldid' );
 513                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 514                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 515                                                 $editor = new EditPage( $article );
 516                                                 $editor->submit();
 517                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 518                                                 $mode = $request->getVal( 'mode' );
 519                                                 $extedit = new ExternalEdit( $article, $mode );
 520                                                 $extedit->edit();
 521                                         }
 522                                 }
 523                                 break;
 524                         case 'history':
 525                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 526                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 527                                 }
 528                                 $history = new PageHistory( $article );
 529                                 $history->history();
 530                                 break;
 531                         default:
 532                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 533                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 534                                 }
 535                 }
 536                 wfProfileOut( __METHOD__ );
 537
 538         }
 539
 540 }; /* End of class MediaWiki */