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 $request WebRequest
  51          */
  52         function performRequestForTitle( &$title, &$article, &$output, &$user, $request ) {
  53                 wfProfileIn( __METHOD__ );
  54
  55                 $output->setTitle( $title );
  56
  57                 wfRunHooks( 'BeforeInitialize', array( &$title, &$article, &$output, &$user, $request, $this ) );
  58
  59                 if( !$this->preliminaryChecks( $title, $output, $request ) ) {
  60                         wfProfileOut( __METHOD__ );
  61                         return;
  62                 }
  63                 // Call handleSpecialCases() to deal with all special requests...
  64                 if( !$this->handleSpecialCases( $title, $output, $request ) ) {
  65                         // ...otherwise treat it as an article view. The article
  66                         // may be a redirect to another article or URL.
  67                         $new_article = $this->initializeArticle( $title, $output, $request );
  68                         if( is_object( $new_article ) ) {
  69                                 $article = $new_article;
  70                                 $this->performAction( $output, $article, $title, $user, $request );
  71                         } elseif( is_string( $new_article ) ) {
  72                                 $output->redirect( $new_article );
  73                         } else {
  74                                 wfProfileOut( __METHOD__ );
  75                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
  76                         }
  77                 }
  78                 wfProfileOut( __METHOD__ );
  79         }
  80
  81         /**
  82          * Check if the maximum lag of database slaves is higher that $maxLag, and
  83          * if it's the case, output an error message
  84          *
  85          * @param $maxLag int: maximum lag allowed for the request, as supplied by
  86          *                the client
  87          * @return bool true if the request can continue
  88          */
  89         function checkMaxLag( $maxLag ) {
  90                 list( $host, $lag ) = wfGetLB()->getMaxLag();
  91                 if( $lag > $maxLag ) {
  92                         wfMaxlagError( $host, $lag, $maxLag );
  93                         return false;
  94                 } else {
  95                         return true;
  96                 }
  97         }
  98
  99         /**
 100          * Checks some initial queries
 101          * Note that $title here is *not* a Title object, but a string!
 102          *
 103          * @param $title String
 104          * @param $action String
 105          * @return Title object to be $wgTitle
 106          */
 107         function checkInitialQueries( $title, $action ) {
 108                 global $wgOut, $wgRequest, $wgContLang;
 109                 if( $wgRequest->getVal( 'printable' ) === 'yes' ) {
 110                         $wgOut->setPrintable();
 111                 }
 112                 $ret = null;
 113                 if( $curid = $wgRequest->getInt( 'curid' ) ) {
 114                         # URLs like this are generated by RC, because rc_title isn't always accurate
 115                         $ret = Title::newFromID( $curid );
 116                 } elseif( $title == '' && 'delete' != $action ) {
 117                         $ret = Title::newMainPage();
 118                 } else {
 119                         $ret = Title::newFromURL( $title );
 120                         // check variant links so that interwiki links don't have to worry
 121                         // about the possible different language variants
 122                         if( count( $wgContLang->getVariants() ) > 1 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 123                                 $wgContLang->findVariantLink( $title, $ret );
 124                 }
 125                 # For non-special titles, check for implicit titles
 126                 if( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) {
 127                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 128                         $oldid = $wgRequest->getInt( 'oldid' );
 129                         $oldid = $oldid ? $oldid : $wgRequest->getInt( 'diff' );
 130                         // Allow oldid to override a changed or missing title
 131                         if( $oldid ) {
 132                                 $rev = Revision::newFromId( $oldid );
 133                                 $ret = $rev ? $rev->getTitle() : $ret;
 134                         }
 135                 }
 136                 return $ret;
 137         }
 138
 139         /**
 140          * Checks for search query and anon-cannot-read case
 141          *
 142          * @param $title Title
 143          * @param $output OutputPage
 144          * @param $request WebRequest
 145          */
 146         function preliminaryChecks( &$title, &$output, $request ) {
 147                 if( $request->getCheck( 'search' ) ) {
 148                         // Compatibility with old search URLs which didn't use Special:Search
 149                         // Just check for presence here, so blank requests still
 150                         // show the search page when using ugly URLs (bug 8054).
 151
 152                         // Do this above the read whitelist check for security...
 153                         $title = SpecialPage::getTitleFor( 'Search' );
 154                 }
 155                 # If the user is not logged in, the Namespace:title of the article must be in
 156                 # the Read array in order for the user to see it. (We have to check here to
 157                 # catch special pages etc. We check again in Article::view())
 158                 if( !is_null( $title ) && !$title->userCanRead() ) {
 159                         global $wgDeferredUpdateList;
 160                         $output->loginToUse();
 161                         $this->finalCleanup( $wgDeferredUpdateList, $output );
 162                         $output->disable();
 163                         return false;
 164                 }
 165                 return true;
 166         }
 167
 168         /**
 169          * Initialize some special cases:
 170          * - bad titles
 171          * - local interwiki redirects
 172          * - redirect loop
 173          * - special pages
 174          *
 175          * @param $title Title
 176          * @param $output OutputPage
 177          * @param $request WebRequest
 178          * @return bool true if the request is already executed
 179          */
 180         function handleSpecialCases( &$title, &$output, $request ) {
 181                 wfProfileIn( __METHOD__ );
 182                 global $wgContLang, $wgUser;
 183                 $action = $this->getVal( 'Action' );
 184                 $perferred = $wgContLang->getPreferredVariant( false );
 185
 186                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 187                 if( is_null($title) || ( ($title->getDBkey() == '') && ($title->getInterwiki() == '') ) ) {
 188                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 189                         # Die now before we mess up $wgArticle and the skin stops working
 190                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 191
 192                 // Interwiki redirects
 193                 } else if( $title->getInterwiki() != '' ) {
 194                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 195                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 196                         } else {
 197                                 $query = $request->getValues();
 198                                 unset( $query['title'] );
 199                                 $url = $title->getFullURL( $query );
 200                         }
 201                         /* Check for a redirect loop */
 202                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 203                                 $output->redirect( $url );
 204                         } else {
 205                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 206                                 wfProfileOut( __METHOD__ );
 207                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 208                         }
 209                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 210                 } else if( $action == 'view' && !$request->wasPosted() &&
 211                         ( ( !isset($this->GET['title']) || $title->getPrefixedDBKey() != $this->GET['title'] ) ||
 212                           // No valid variant in URL (if the main-language has multi-variants), to ensure
 213                           // anonymous access would always be redirect to a URL with 'variant' parameter
 214                           ( !isset($this->GET['variant']) && $wgContLang->hasVariants() && !$wgUser->isLoggedIn() ) ) &&
 215                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 216                 {
 217                         if( !$wgUser->isLoggedIn() ) {
 218                                 $pref = $wgContLang->getPreferredVariant( false, $fromHeader = true );
 219                                 $targetUrl = $title->getFullURL( '', $variant = $pref );
 220                         }
 221                         else
 222                                 $targetUrl = $title->getFullURL();
 223                         // Redirect to canonical url, make it a 301 to allow caching
 224                         if( $targetUrl == $request->getFullRequestURL() ) {
 225                                 $message = "Redirect loop detected!\n\n" .
 226                                         "This means the wiki got confused about what page was " .
 227                                         "requested; this sometimes happens when moving a wiki " .
 228                                         "to a new server or changing the server configuration.\n\n";
 229
 230                                 if( $this->getVal( 'UsePathInfo' ) ) {
 231                                         $message .= "The wiki is trying to interpret the page " .
 232                                                 "title from the URL path portion (PATH_INFO), which " .
 233                                                 "sometimes fails depending on the web server. Try " .
 234                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 235                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 236                                                 "is correct.";
 237                                 } else {
 238                                         $message .= "Your web server was detected as possibly not " .
 239                                                 "supporting URL path components (PATH_INFO) correctly; " .
 240                                                 "check your LocalSettings.php for a customized " .
 241                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 242                                                 "to true.";
 243                                 }
 244                                 wfHttpError( 500, "Internal error", $message );
 245                                 wfProfileOut( __METHOD__ );
 246                                 return false;
 247                         } else {
 248                                 $output->setSquidMaxage( 1200 );
 249                                 $output->redirect( $targetUrl, '301' );
 250                         }
 251                 // Special pages
 252                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 253                         /* actions that need to be made when we have a special pages */
 254                         SpecialPage::executePath( $title );
 255                 } else {
 256                         /* No match to special cases */
 257                         wfProfileOut( __METHOD__ );
 258                         return false;
 259                 }
 260                 /* Did match a special case */
 261                 wfProfileOut( __METHOD__ );
 262                 return true;
 263         }
 264
 265         /**
 266          * Create an Article object of the appropriate class for the given page.
 267          *
 268          * @param $title Title
 269          * @return Article object
 270          */
 271         static function articleFromTitle( &$title ) {
 272                 if( NS_MEDIA == $title->getNamespace() ) {
 273                         // FIXME: where should this go?
 274                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 275                 }
 276
 277                 $article = null;
 278                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 279                 if( $article ) {
 280                         return $article;
 281                 }
 282
 283                 switch( $title->getNamespace() ) {
 284                         case NS_FILE:
 285                                 return new ImagePage( $title );
 286                         case NS_CATEGORY:
 287                                 return new CategoryPage( $title );
 288                         default:
 289                                 return new Article( $title );
 290                 }
 291         }
 292
 293         /**
 294          * Initialize the object to be known as $wgArticle for "standard" actions
 295          * Create an Article object for the page, following redirects if needed.
 296          *
 297          * @param $title Title ($wgTitle)
 298          * @param $output OutputPage ($wgOut)
 299          * @param $request WebRequest ($wgRequest)
 300          * @return mixed an Article, or a string to redirect to another URL
 301          */
 302         function initializeArticle( &$title, &$output, $request ) {
 303                 wfProfileIn( __METHOD__ );
 304
 305                 $action = $this->getVal( 'action', 'view' );
 306                 $article = self::articleFromTitle( $title );
 307                 # NS_MEDIAWIKI has no redirects.
 308                 # It is also used for CSS/JS, so performance matters here...
 309                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
 310                         wfProfileOut( __METHOD__ );
 311                         return $article;
 312                 }
 313                 // Namespace might change when using redirects
 314                 // Check for redirects ...
 315                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 316                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 317                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 318                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 319                         // ... and the article is not a non-redirect image page with associated file
 320                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 321                 {
 322                         # Give extensions a change to ignore/handle redirects as needed
 323                         $ignoreRedirect = $target = false;
 324
 325                         $dbr = wfGetDB( DB_SLAVE );
 326                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 327
 328                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 329                                 array(&$title,&$request,&$ignoreRedirect,&$target,&$article) );
 330
 331                         // Follow redirects only for... redirects.
 332                         // If $target is set, then a hook wanted to redirect.
 333                         if( !$ignoreRedirect && ($target || $article->isRedirect()) ) {
 334                                 # Is the target already set by an extension?
 335                                 $target = $target ? $target : $article->followRedirect();
 336                                 if( is_string( $target ) ) {
 337                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 338                                                 // we'll need to redirect
 339                                                 wfProfileOut( __METHOD__ );
 340                                                 return $target;
 341                                         }
 342                                 }
 343                                 if( is_object($target) ) {
 344                                         // Rewrite environment to redirected article
 345                                         $rarticle = self::articleFromTitle( $target );
 346                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 347                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 348                                                 $rarticle->setRedirectedFrom( $title );
 349                                                 $article = $rarticle;
 350                                                 $title = $target;
 351                                                 $output->setTitle( $title );
 352                                         }
 353                                 }
 354                         } else {
 355                                 $title = $article->getTitle();
 356                         }
 357                 }
 358                 wfProfileOut( __METHOD__ );
 359                 return $article;
 360         }
 361
 362         /**
 363          * Cleaning up request by doing:
 364          ** deferred updates, DB transaction, and the output
 365          *
 366          * @param $deferredUpdates array of updates to do
 367          * @param $output OutputPage
 368          */
 369         function finalCleanup( &$deferredUpdates, &$output ) {
 370                 wfProfileIn( __METHOD__ );
 371                 # Now commit any transactions, so that unreported errors after
 372                 # output() don't roll back the whole DB transaction
 373                 $factory = wfGetLBFactory();
 374                 $factory->commitMasterChanges();
 375                 # Output everything!
 376                 $output->output();
 377                 # Do any deferred jobs
 378                 $this->doUpdates( $deferredUpdates );
 379                 $this->doJobs();
 380                 wfProfileOut( __METHOD__ );
 381         }
 382
 383         /**
 384          * Deferred updates aren't really deferred anymore. It's important to report
 385          * errors to the user, and that means doing this before OutputPage::output().
 386          * Note that for page saves, the client will wait until the script exits
 387          * anyway before following the redirect.
 388          *
 389          * @param $updates array of objects that hold an update to do
 390          */
 391         function doUpdates( &$updates ) {
 392                 wfProfileIn( __METHOD__ );
 393                 /* No need to get master connections in case of empty updates array */
 394                 if (!$updates) {
 395                         wfProfileOut( __METHOD__ );
 396                         return;
 397                 }
 398
 399                 $dbw = wfGetDB( DB_MASTER );
 400                 foreach( $updates as $up ) {
 401                         $up->doUpdate();
 402
 403                         # Commit after every update to prevent lock contention
 404                         if( $dbw->trxLevel() ) {
 405                                 $dbw->commit();
 406                         }
 407                 }
 408                 wfProfileOut( __METHOD__ );
 409         }
 410
 411         /**
 412          * Do a job from the job queue
 413          */
 414         function doJobs() {
 415                 $jobRunRate = $this->getVal( 'JobRunRate' );
 416
 417                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 418                         return;
 419                 }
 420                 if( $jobRunRate < 1 ) {
 421                         $max = mt_getrandmax();
 422                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 423                                 return;
 424                         }
 425                         $n = 1;
 426                 } else {
 427                         $n = intval( $jobRunRate );
 428                 }
 429
 430                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 431                         $output = $job->toString() . "\n";
 432                         $t = -wfTime();
 433                         $success = $job->run();
 434                         $t += wfTime();
 435                         $t = round( $t*1000 );
 436                         if( !$success ) {
 437                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 438                         } else {
 439                                 $output .= "Success, Time: $t ms\n";
 440                         }
 441                         wfDebugLog( 'jobqueue', $output );
 442                 }
 443         }
 444
 445         /**
 446          * Ends this task peacefully
 447          */
 448         function restInPeace() {
 449                 wfLogProfilingData();
 450                 # Commit and close up!
 451                 $factory = wfGetLBFactory();
 452                 $factory->commitMasterChanges();
 453                 $factory->shutdown();
 454                 wfDebug( "Request ended normally\n" );
 455         }
 456
 457         /**
 458          * Perform one of the "standard" actions
 459          *
 460          * @param $output OutputPage
 461          * @param $article Article
 462          * @param $title Title
 463          * @param $user User
 464          * @param $request WebRequest
 465          */
 466         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 467                 wfProfileIn( __METHOD__ );
 468
 469                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 470                         wfProfileOut( __METHOD__ );
 471                         return;
 472                 }
 473
 474                 $action = $this->getVal( 'Action' );
 475                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 476                         /* No such action; this will switch to the default case */
 477                         $action = 'nosuchaction';
 478                 }
 479
 480                 # Workaround for bug #20966: inability of IE to provide an action dependent
 481                 # on which submit button is clicked.
 482                 if ( $action === 'historysubmit' ) {
 483                         if ( $request->getBool( 'revisiondelete' ) ) {
 484                                 $action = 'revisiondelete';
 485                         } else {
 486                                 $action = 'view';
 487                         }
 488                 }
 489
 490                 switch( $action ) {
 491                         case 'view':
 492                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 493                                 $article->view();
 494                                 break;
 495                         case 'raw': // includes JS/CSS
 496                                 wfProfileIn( __METHOD__.'-raw' );
 497                                 $raw = new RawPage( $article );
 498                                 $raw->view();
 499                                 wfProfileOut( __METHOD__.'-raw' );
 500                                 break;
 501                         case 'watch':
 502                         case 'unwatch':
 503                         case 'delete':
 504                         case 'revert':
 505                         case 'rollback':
 506                         case 'protect':
 507                         case 'unprotect':
 508                         case 'info':
 509                         case 'markpatrolled':
 510                         case 'render':
 511                         case 'deletetrackback':
 512                         case 'purge':
 513                                 $article->$action();
 514                                 break;
 515                         case 'print':
 516                                 $article->view();
 517                                 break;
 518                         case 'dublincore':
 519                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 520                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 521                                 } else {
 522                                         $rdf = new DublinCoreRdf( $article );
 523                                         $rdf->show();
 524                                 }
 525                                 break;
 526                         case 'creativecommons':
 527                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 528                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 529                                 } else {
 530                                         $rdf = new CreativeCommonsRdf( $article );
 531                                         $rdf->show();
 532                                 }
 533                                 break;
 534                         case 'credits':
 535                                 Credits::showPage( $article );
 536                                 break;
 537                         case 'submit':
 538                                 if( session_id() == '' ) {
 539                                         /* Send a cookie so anons get talk message notifications */
 540                                         wfSetupSession();
 541                                 }
 542                                 /* Continue... */
 543                         case 'edit':
 544                         case 'editredlink':
 545                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 546                                         $internal = $request->getVal( 'internaledit' );
 547                                         $external = $request->getVal( 'externaledit' );
 548                                         $section = $request->getVal( 'section' );
 549                                         $oldid = $request->getVal( 'oldid' );
 550                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 551                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 552                                                 $editor = new EditPage( $article );
 553                                                 $editor->submit();
 554                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 555                                                 $mode = $request->getVal( 'mode' );
 556                                                 $extedit = new ExternalEdit( $article, $mode );
 557                                                 $extedit->edit();
 558                                         }
 559                                 }
 560                                 break;
 561                         case 'history':
 562                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 563                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 564                                 }
 565                                 $history = new HistoryPage( $article );
 566                                 $history->history();
 567                                 break;
 568                         case 'revisiondelete':
 569                                 # For show/hide submission from history page
 570                                 $special = SpecialPage::getPage( 'Revisiondelete' );
 571                                 $special->execute( '' );
 572                                 break;
 573                         default:
 574                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 575                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 576                                 }
 577                 }
 578                 wfProfileOut( __METHOD__ );
 579
 580         }
 581
 582 }; /* End of class MediaWiki */