includes/Wiki.php

   1 <?php
   2 /**
   3  * MediaWiki is the to-be base class for this whole project
   4  *
   5  * @internal documentation reviewed 15 Mar 2010
   6  */
   7 class MediaWiki {
   8
   9         var $GET; /* Stores the $_GET variables at time of creation, can be changed */
  10         var $params = array();
  11
  12         /** Constructor. It just save the $_GET variable */
  13         function __construct() {
  14                 $this->GET = $_GET;
  15         }
  16
  17         /**
  18          * Stores key/value pairs to circumvent global variables
  19          * Note that keys are case-insensitive!
  20          *
  21          * @param $key String: key to store
  22          * @param $value Mixed: value to put for the key
  23          */
  24         function setVal( $key, &$value ) {
  25                 $key = strtolower( $key );
  26                 $this->params[$key] =& $value;
  27         }
  28
  29         /**
  30          * Retrieves key/value pairs to circumvent global variables
  31          * Note that keys are case-insensitive!
  32          *
  33          * @param $key String: key to get
  34          * @param $default string default value, defaults to empty string
  35          * @return $default Mixed: default value if if the key doesn't exist
  36          */
  37         function getVal( $key, $default = '' ) {
  38                 $key = strtolower( $key );
  39                 if( isset( $this->params[$key] ) ) {
  40                         return $this->params[$key];
  41                 }
  42                 return $default;
  43         }
  44
  45         /**
  46          * Initialization of ... everything
  47          * Performs the request too
  48          *
  49          * @param $title Title ($wgTitle)
  50          * @param $article Article
  51          * @param $output OutputPage
  52          * @param $user User
  53          * @param $request WebRequest
  54          */
  55         function performRequestForTitle( &$title, &$article, &$output, &$user, $request ) {
  56                 wfProfileIn( __METHOD__ );
  57
  58                 $output->setTitle( $title );
  59
  60                 wfRunHooks( 'BeforeInitialize', array( &$title, &$article, &$output, &$user, $request, $this ) );
  61
  62                 if( !$this->preliminaryChecks( $title, $output, $request ) ) {
  63                         wfProfileOut( __METHOD__ );
  64                         return;
  65                 }
  66                 // Call handleSpecialCases() to deal with all special requests...
  67                 if( !$this->handleSpecialCases( $title, $output, $request ) ) {
  68                         // ...otherwise treat it as an article view. The article
  69                         // may be a redirect to another article or URL.
  70                         $new_article = $this->initializeArticle( $title, $output, $request );
  71                         if( is_object( $new_article ) ) {
  72                                 $article = $new_article;
  73                                 $this->performAction( $output, $article, $title, $user, $request );
  74                         } elseif( is_string( $new_article ) ) {
  75                                 $output->redirect( $new_article );
  76                         } else {
  77                                 wfProfileOut( __METHOD__ );
  78                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
  79                         }
  80                 }
  81                 wfProfileOut( __METHOD__ );
  82         }
  83
  84         /**
  85          * Check if the maximum lag of database slaves is higher that $maxLag, and
  86          * if it's the case, output an error message
  87          *
  88          * @param $maxLag int: maximum lag allowed for the request, as supplied by
  89          *                the client
  90          * @return bool true if the request can continue
  91          */
  92         function checkMaxLag( $maxLag ) {
  93                 list( $host, $lag ) = wfGetLB()->getMaxLag();
  94                 if( $lag > $maxLag ) {
  95                         wfMaxlagError( $host, $lag, $maxLag );
  96                         return false;
  97                 } else {
  98                         return true;
  99                 }
 100         }
 101
 102         /**
 103          * Checks some initial queries
 104          * Note that $title here is *not* a Title object, but a string!
 105          *
 106          * @param $title String
 107          * @param $action String
 108          * @return Title object to be $wgTitle
 109          */
 110         function checkInitialQueries( $title, $action ) {
 111                 global $wgOut, $wgRequest, $wgContLang;
 112                 if( $wgRequest->getVal( 'printable' ) === 'yes' ) {
 113                         $wgOut->setPrintable();
 114                 }
 115                 $ret = null;
 116                 if( $curid = $wgRequest->getInt( 'curid' ) ) {
 117                         # URLs like this are generated by RC, because rc_title isn't always accurate
 118                         $ret = Title::newFromID( $curid );
 119                 } elseif( $title == '' && $action != 'delete' ) {
 120                         $ret = Title::newMainPage();
 121                 } else {
 122                         $ret = Title::newFromURL( $title );
 123                         // check variant links so that interwiki links don't have to worry
 124                         // about the possible different language variants
 125                         if( count( $wgContLang->getVariants() ) > 1 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 126                                 $wgContLang->findVariantLink( $title, $ret );
 127                 }
 128                 # For non-special titles, check for implicit titles
 129                 if( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) {
 130                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 131                         $oldid = $wgRequest->getInt( 'oldid' );
 132                         $oldid = $oldid ? $oldid : $wgRequest->getInt( 'diff' );
 133                         // Allow oldid to override a changed or missing title
 134                         if( $oldid ) {
 135                                 $rev = Revision::newFromId( $oldid );
 136                                 $ret = $rev ? $rev->getTitle() : $ret;
 137                         }
 138                 }
 139                 return $ret;
 140         }
 141
 142         /**
 143          * Checks for search query and anon-cannot-read case
 144          *
 145          * @param $title Title
 146          * @param $output OutputPage
 147          * @param $request WebRequest
 148          * @return boolean true if successful
 149          */
 150         function preliminaryChecks( &$title, &$output, $request ) {
 151                 if( $request->getCheck( 'search' ) ) {
 152                         // Compatibility with old search URLs which didn't use Special:Search
 153                         // Just check for presence here, so blank requests still
 154                         // show the search page when using ugly URLs (bug 8054).
 155
 156                         // Do this above the read whitelist check for security...
 157                         $title = SpecialPage::getTitleFor( 'Search' );
 158                 }
 159                 # If the user is not logged in, the Namespace:title of the article must be in
 160                 # the Read array in order for the user to see it. (We have to check here to
 161                 # catch special pages etc. We check again in Article::view())
 162                 if( !is_null( $title ) && !$title->userCanRead() ) {
 163                         global $wgDeferredUpdateList;
 164                         $output->loginToUse();
 165                         $this->finalCleanup( $wgDeferredUpdateList, $output );
 166                         $output->disable();
 167                         return false;
 168                 }
 169                 return true;
 170         }
 171
 172         /**
 173          * Initialize some special cases:
 174          * - bad titles
 175          * - local interwiki redirects
 176          * - redirect loop
 177          * - special pages
 178          *
 179          * @param $title Title
 180          * @param $output OutputPage
 181          * @param $request WebRequest
 182          * @return bool true if the request is already executed
 183          */
 184         function handleSpecialCases( &$title, &$output, $request ) {
 185                 wfProfileIn( __METHOD__ );
 186                 global $wgContLang, $wgUser;
 187                 $action = $this->getVal( 'Action' );
 188                 $perferred = $wgContLang->getPreferredVariant( false );
 189
 190                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 191                 if( is_null($title) || ( ($title->getDBkey() == '') && ($title->getInterwiki() == '') ) ) {
 192                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 193                         # Die now before we mess up $wgArticle and the skin stops working
 194                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 195
 196                 // Interwiki redirects
 197                 } else if( $title->getInterwiki() != '' ) {
 198                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 199                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 200                         } else {
 201                                 $query = $request->getValues();
 202                                 unset( $query['title'] );
 203                                 $url = $title->getFullURL( $query );
 204                         }
 205                         /* Check for a redirect loop */
 206                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 207                                 $output->redirect( $url );
 208                         } else {
 209                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 210                                 $output->setTitle( $title ); // bug 21456
 211                                 wfProfileOut( __METHOD__ );
 212                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 213                         }
 214                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 215                 } else if( $action == 'view' && !$request->wasPosted() &&
 216                         ( ( !isset($this->GET['title']) || $title->getPrefixedDBKey() != $this->GET['title'] ) ||
 217                           // No valid variant in URL (if the main-language has multi-variants), to ensure
 218                           // anonymous access would always be redirect to a URL with 'variant' parameter
 219                           ( !isset($this->GET['variant']) && $wgContLang->hasVariants() && !$wgUser->isLoggedIn() ) ) &&
 220                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 221                 {
 222                         if( !$wgUser->isLoggedIn() ) {
 223                                 $pref = $wgContLang->getPreferredVariant( false, $fromHeader = true );
 224                                 $targetUrl = $title->getFullURL( '', $variant = $pref );
 225                         }
 226                         else
 227                                 $targetUrl = $title->getFullURL();
 228                         // Redirect to canonical url, make it a 301 to allow caching
 229                         if( $targetUrl == $request->getFullRequestURL() ) {
 230                                 $message = "Redirect loop detected!\n\n" .
 231                                         "This means the wiki got confused about what page was " .
 232                                         "requested; this sometimes happens when moving a wiki " .
 233                                         "to a new server or changing the server configuration.\n\n";
 234
 235                                 if( $this->getVal( 'UsePathInfo' ) ) {
 236                                         $message .= "The wiki is trying to interpret the page " .
 237                                                 "title from the URL path portion (PATH_INFO), which " .
 238                                                 "sometimes fails depending on the web server. Try " .
 239                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 240                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 241                                                 "is correct.";
 242                                 } else {
 243                                         $message .= "Your web server was detected as possibly not " .
 244                                                 "supporting URL path components (PATH_INFO) correctly; " .
 245                                                 "check your LocalSettings.php for a customized " .
 246                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 247                                                 "to true.";
 248                                 }
 249                                 wfHttpError( 500, "Internal error", $message );
 250                                 wfProfileOut( __METHOD__ );
 251                                 return false;
 252                         } else {
 253                                 $output->setSquidMaxage( 1200 );
 254                                 $output->redirect( $targetUrl, '301' );
 255                         }
 256                 // Special pages
 257                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 258                         /* actions that need to be made when we have a special pages */
 259                         SpecialPage::executePath( $title );
 260                 } else {
 261                         /* No match to special cases */
 262                         wfProfileOut( __METHOD__ );
 263                         return false;
 264                 }
 265                 /* Did match a special case */
 266                 wfProfileOut( __METHOD__ );
 267                 return true;
 268         }
 269
 270         /**
 271          * Create an Article object of the appropriate class for the given page.
 272          *
 273          * @param $title Title
 274          * @return Article object
 275          */
 276         static function articleFromTitle( &$title ) {
 277                 if( NS_MEDIA == $title->getNamespace() ) {
 278                         // FIXME: where should this go?
 279                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 280                 }
 281
 282                 $article = null;
 283                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 284                 if( $article ) {
 285                         return $article;
 286                 }
 287
 288                 switch( $title->getNamespace() ) {
 289                         case NS_FILE:
 290                                 return new ImagePage( $title );
 291                         case NS_CATEGORY:
 292                                 return new CategoryPage( $title );
 293                         default:
 294                                 return new Article( $title );
 295                 }
 296         }
 297
 298         /**
 299          * Initialize the object to be known as $wgArticle for "standard" actions
 300          * Create an Article object for the page, following redirects if needed.
 301          *
 302          * @param $title Title ($wgTitle)
 303          * @param $output OutputPage ($wgOut)
 304          * @param $request WebRequest ($wgRequest)
 305          * @return mixed an Article, or a string to redirect to another URL
 306          */
 307         function initializeArticle( &$title, &$output, $request ) {
 308                 wfProfileIn( __METHOD__ );
 309
 310                 $action = $this->getVal( 'action', 'view' );
 311                 $article = self::articleFromTitle( $title );
 312                 # NS_MEDIAWIKI has no redirects.
 313                 # It is also used for CSS/JS, so performance matters here...
 314                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
 315                         wfProfileOut( __METHOD__ );
 316                         return $article;
 317                 }
 318                 // Namespace might change when using redirects
 319                 // Check for redirects ...
 320                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 321                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 322                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 323                         !$request->getVal( 'diff' ) &&    // ... and not when showing diff
 324                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 325                         // ... and the article is not a non-redirect image page with associated file
 326                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 327                 {
 328                         # Give extensions a change to ignore/handle redirects as needed
 329                         $ignoreRedirect = $target = false;
 330
 331                         $dbr = wfGetDB( DB_SLAVE );
 332                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 333
 334                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 335                                 array(&$title,&$request,&$ignoreRedirect,&$target,&$article) );
 336
 337                         // Follow redirects only for... redirects.
 338                         // If $target is set, then a hook wanted to redirect.
 339                         if( !$ignoreRedirect && ($target || $article->isRedirect()) ) {
 340                                 # Is the target already set by an extension?
 341                                 $target = $target ? $target : $article->followRedirect();
 342                                 if( is_string( $target ) ) {
 343                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 344                                                 // we'll need to redirect
 345                                                 wfProfileOut( __METHOD__ );
 346                                                 return $target;
 347                                         }
 348                                 }
 349                                 if( is_object($target) ) {
 350                                         // Rewrite environment to redirected article
 351                                         $rarticle = self::articleFromTitle( $target );
 352                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 353                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 354                                                 $rarticle->setRedirectedFrom( $title );
 355                                                 $article = $rarticle;
 356                                                 $title = $target;
 357                                                 $output->setTitle( $title );
 358                                         }
 359                                 }
 360                         } else {
 361                                 $title = $article->getTitle();
 362                         }
 363                 }
 364                 wfProfileOut( __METHOD__ );
 365                 return $article;
 366         }
 367
 368         /**
 369          * Cleaning up request by doing:
 370          ** deferred updates, DB transaction, and the output
 371          *
 372          * @param $deferredUpdates array of updates to do
 373          * @param $output OutputPage
 374          */
 375         function finalCleanup( &$deferredUpdates, &$output ) {
 376                 wfProfileIn( __METHOD__ );
 377                 # Now commit any transactions, so that unreported errors after
 378                 # output() don't roll back the whole DB transaction
 379                 $factory = wfGetLBFactory();
 380                 $factory->commitMasterChanges();
 381                 # Output everything!
 382                 $output->output();
 383                 # Do any deferred jobs
 384                 $this->doUpdates( $deferredUpdates );
 385                 $this->doJobs();
 386                 wfProfileOut( __METHOD__ );
 387         }
 388
 389         /**
 390          * Deferred updates aren't really deferred anymore. It's important to report
 391          * errors to the user, and that means doing this before OutputPage::output().
 392          * Note that for page saves, the client will wait until the script exits
 393          * anyway before following the redirect.
 394          *
 395          * @param $updates array of objects that hold an update to do
 396          */
 397         function doUpdates( &$updates ) {
 398                 wfProfileIn( __METHOD__ );
 399                 /* No need to get master connections in case of empty updates array */
 400                 if (!$updates) {
 401                         wfProfileOut( __METHOD__ );
 402                         return;
 403                 }
 404
 405                 $dbw = wfGetDB( DB_MASTER );
 406                 foreach( $updates as $up ) {
 407                         $up->doUpdate();
 408
 409                         # Commit after every update to prevent lock contention
 410                         if( $dbw->trxLevel() ) {
 411                                 $dbw->commit();
 412                         }
 413                 }
 414                 wfProfileOut( __METHOD__ );
 415         }
 416
 417         /**
 418          * Do a job from the job queue
 419          */
 420         function doJobs() {
 421                 $jobRunRate = $this->getVal( 'JobRunRate' );
 422
 423                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 424                         return;
 425                 }
 426                 if( $jobRunRate < 1 ) {
 427                         $max = mt_getrandmax();
 428                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 429                                 return;
 430                         }
 431                         $n = 1;
 432                 } else {
 433                         $n = intval( $jobRunRate );
 434                 }
 435
 436                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 437                         $output = $job->toString() . "\n";
 438                         $t = -wfTime();
 439                         $success = $job->run();
 440                         $t += wfTime();
 441                         $t = round( $t*1000 );
 442                         if( !$success ) {
 443                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 444                         } else {
 445                                 $output .= "Success, Time: $t ms\n";
 446                         }
 447                         wfDebugLog( 'jobqueue', $output );
 448                 }
 449         }
 450
 451         /**
 452          * Ends this task peacefully
 453          */
 454         function restInPeace() {
 455                 wfLogProfilingData();
 456                 # Commit and close up!
 457                 $factory = wfGetLBFactory();
 458                 $factory->commitMasterChanges();
 459                 $factory->shutdown();
 460                 wfDebug( "Request ended normally\n" );
 461         }
 462
 463         /**
 464          * Perform one of the "standard" actions
 465          *
 466          * @param $output OutputPage
 467          * @param $article Article
 468          * @param $title Title
 469          * @param $user User
 470          * @param $request WebRequest
 471          */
 472         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 473                 wfProfileIn( __METHOD__ );
 474
 475                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 476                         wfProfileOut( __METHOD__ );
 477                         return;
 478                 }
 479
 480                 $action = $this->getVal( 'Action' );
 481                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 482                         /* No such action; this will switch to the default case */
 483                         $action = 'nosuchaction';
 484                 }
 485
 486                 # Workaround for bug #20966: inability of IE to provide an action dependent
 487                 # on which submit button is clicked.
 488                 if ( $action === 'historysubmit' ) {
 489                         if ( $request->getBool( 'revisiondelete' ) ) {
 490                                 $action = 'revisiondelete';
 491                         } else {
 492                                 $action = 'view';
 493                         }
 494                 }
 495
 496                 switch( $action ) {
 497                         case 'view':
 498                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 499                                 $article->view();
 500                                 break;
 501                         case 'raw': // includes JS/CSS
 502                                 wfProfileIn( __METHOD__.'-raw' );
 503                                 $raw = new RawPage( $article );
 504                                 $raw->view();
 505                                 wfProfileOut( __METHOD__.'-raw' );
 506                                 break;
 507                         case 'watch':
 508                         case 'unwatch':
 509                         case 'delete':
 510                         case 'revert':
 511                         case 'rollback':
 512                         case 'protect':
 513                         case 'unprotect':
 514                         case 'info':
 515                         case 'markpatrolled':
 516                         case 'render':
 517                         case 'deletetrackback':
 518                         case 'purge':
 519                                 $article->$action();
 520                                 break;
 521                         case 'print':
 522                                 $article->view();
 523                                 break;
 524                         case 'dublincore':
 525                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 526                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 527                                 } else {
 528                                         $rdf = new DublinCoreRdf( $article );
 529                                         $rdf->show();
 530                                 }
 531                                 break;
 532                         case 'creativecommons':
 533                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 534                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 535                                 } else {
 536                                         $rdf = new CreativeCommonsRdf( $article );
 537                                         $rdf->show();
 538                                 }
 539                                 break;
 540                         case 'credits':
 541                                 Credits::showPage( $article );
 542                                 break;
 543                         case 'submit':
 544                                 if( session_id() == '' ) {
 545                                         /* Send a cookie so anons get talk message notifications */
 546                                         wfSetupSession();
 547                                 }
 548                                 /* Continue... */
 549                         case 'edit':
 550                         case 'editredlink':
 551                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 552                                         $internal = $request->getVal( 'internaledit' );
 553                                         $external = $request->getVal( 'externaledit' );
 554                                         $section = $request->getVal( 'section' );
 555                                         $oldid = $request->getVal( 'oldid' );
 556                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 557                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 558                                                 $editor = new EditPage( $article );
 559                                                 $editor->submit();
 560                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 561                                                 $mode = $request->getVal( 'mode' );
 562                                                 $extedit = new ExternalEdit( $article, $mode );
 563                                                 $extedit->edit();
 564                                         }
 565                                 }
 566                                 break;
 567                         case 'history':
 568                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 569                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 570                                 }
 571                                 $history = new HistoryPage( $article );
 572                                 $history->history();
 573                                 break;
 574                         case 'revisiondelete':
 575                                 # For show/hide submission from history page
 576                                 $special = SpecialPage::getPage( 'Revisiondelete' );
 577                                 $special->execute( '' );
 578                                 break;
 579                         default:
 580                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 581                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 582                                 }
 583                 }
 584                 wfProfileOut( __METHOD__ );
 585
 586         }
 587
 588 }; /* End of class MediaWiki */