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                         $output->setTitle( $title ); // bug 21456
 194                         // Die now before we mess up $wgArticle and the skin stops working
 195                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 196
 197                 // Interwiki redirects
 198                 } else if( $title->getInterwiki() != '' ) {
 199                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 200                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 201                         } else {
 202                                 $query = $request->getValues();
 203                                 unset( $query['title'] );
 204                                 $url = $title->getFullURL( $query );
 205                         }
 206                         /* Check for a redirect loop */
 207                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 208                                 $output->redirect( $url );
 209                         } else {
 210                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 211                                 $output->setTitle( $title ); // bug 21456
 212                                 wfProfileOut( __METHOD__ );
 213                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 214                         }
 215                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 216                 } else if( $action == 'view' && !$request->wasPosted() &&
 217                         ( ( !isset($this->GET['title']) || $title->getPrefixedDBKey() != $this->GET['title'] ) ||
 218                           // No valid variant in URL (if the main-language has multi-variants), to ensure
 219                           // anonymous access would always be redirect to a URL with 'variant' parameter
 220                           ( !isset($this->GET['variant']) && $wgContLang->hasVariants() && !$wgUser->isLoggedIn() ) ) &&
 221                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 222                 {
 223                         if( !$wgUser->isLoggedIn() ) {
 224                                 $pref = $wgContLang->getPreferredVariant( false, $fromHeader = true );
 225                                 $targetUrl = $title->getFullURL( '', $variant = $pref );
 226                         }
 227                         else
 228                                 $targetUrl = $title->getFullURL();
 229                         // Redirect to canonical url, make it a 301 to allow caching
 230                         if( $targetUrl == $request->getFullRequestURL() ) {
 231                                 $message = "Redirect loop detected!\n\n" .
 232                                         "This means the wiki got confused about what page was " .
 233                                         "requested; this sometimes happens when moving a wiki " .
 234                                         "to a new server or changing the server configuration.\n\n";
 235
 236                                 if( $this->getVal( 'UsePathInfo' ) ) {
 237                                         $message .= "The wiki is trying to interpret the page " .
 238                                                 "title from the URL path portion (PATH_INFO), which " .
 239                                                 "sometimes fails depending on the web server. Try " .
 240                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 241                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 242                                                 "is correct.";
 243                                 } else {
 244                                         $message .= "Your web server was detected as possibly not " .
 245                                                 "supporting URL path components (PATH_INFO) correctly; " .
 246                                                 "check your LocalSettings.php for a customized " .
 247                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 248                                                 "to true.";
 249                                 }
 250                                 wfHttpError( 500, "Internal error", $message );
 251                                 wfProfileOut( __METHOD__ );
 252                                 return false;
 253                         } else {
 254                                 $output->setSquidMaxage( 1200 );
 255                                 $output->redirect( $targetUrl, '301' );
 256                         }
 257                 // Special pages
 258                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 259                         /* actions that need to be made when we have a special pages */
 260                         SpecialPage::executePath( $title );
 261                 } else {
 262                         /* No match to special cases */
 263                         wfProfileOut( __METHOD__ );
 264                         return false;
 265                 }
 266                 /* Did match a special case */
 267                 wfProfileOut( __METHOD__ );
 268                 return true;
 269         }
 270
 271         /**
 272          * Create an Article object of the appropriate class for the given page.
 273          *
 274          * @param $title Title
 275          * @return Article object
 276          */
 277         static function articleFromTitle( &$title ) {
 278                 if( NS_MEDIA == $title->getNamespace() ) {
 279                         // FIXME: where should this go?
 280                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 281                 }
 282
 283                 $article = null;
 284                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 285                 if( $article ) {
 286                         return $article;
 287                 }
 288
 289                 switch( $title->getNamespace() ) {
 290                         case NS_FILE:
 291                                 return new ImagePage( $title );
 292                         case NS_CATEGORY:
 293                                 return new CategoryPage( $title );
 294                         default:
 295                                 return new Article( $title );
 296                 }
 297         }
 298
 299         /**
 300          * Initialize the object to be known as $wgArticle for "standard" actions
 301          * Create an Article object for the page, following redirects if needed.
 302          *
 303          * @param $title Title ($wgTitle)
 304          * @param $output OutputPage ($wgOut)
 305          * @param $request WebRequest ($wgRequest)
 306          * @return mixed an Article, or a string to redirect to another URL
 307          */
 308         function initializeArticle( &$title, &$output, $request ) {
 309                 wfProfileIn( __METHOD__ );
 310
 311                 $action = $this->getVal( 'action', 'view' );
 312                 $article = self::articleFromTitle( $title );
 313                 // NS_MEDIAWIKI has no redirects.
 314                 // It is also used for CSS/JS, so performance matters here...
 315                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
 316                         wfProfileOut( __METHOD__ );
 317                         return $article;
 318                 }
 319                 // Namespace might change when using redirects
 320                 // Check for redirects ...
 321                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 322                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 323                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 324                         !$request->getVal( 'diff' ) &&    // ... and not when showing diff
 325                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 326                         // ... and the article is not a non-redirect image page with associated file
 327                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 328                 {
 329                         // Give extensions a change to ignore/handle redirects as needed
 330                         $ignoreRedirect = $target = false;
 331
 332                         $dbr = wfGetDB( DB_SLAVE );
 333                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 334
 335                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 336                                 array(&$title,&$request,&$ignoreRedirect,&$target,&$article) );
 337
 338                         // Follow redirects only for... redirects.
 339                         // If $target is set, then a hook wanted to redirect.
 340                         if( !$ignoreRedirect && ($target || $article->isRedirect()) ) {
 341                                 // Is the target already set by an extension?
 342                                 $target = $target ? $target : $article->followRedirect();
 343                                 if( is_string( $target ) ) {
 344                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 345                                                 // we'll need to redirect
 346                                                 wfProfileOut( __METHOD__ );
 347                                                 return $target;
 348                                         }
 349                                 }
 350                                 if( is_object($target) ) {
 351                                         // Rewrite environment to redirected article
 352                                         $rarticle = self::articleFromTitle( $target );
 353                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 354                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 355                                                 $rarticle->setRedirectedFrom( $title );
 356                                                 $article = $rarticle;
 357                                                 $title = $target;
 358                                                 $output->setTitle( $title );
 359                                         }
 360                                 }
 361                         } else {
 362                                 $title = $article->getTitle();
 363                         }
 364                 }
 365                 wfProfileOut( __METHOD__ );
 366                 return $article;
 367         }
 368
 369         /**
 370          * Cleaning up request by doing:
 371          ** deferred updates, DB transaction, and the output
 372          *
 373          * @param $deferredUpdates array of updates to do
 374          * @param $output OutputPage
 375          */
 376         function finalCleanup( &$deferredUpdates, &$output ) {
 377                 wfProfileIn( __METHOD__ );
 378                 // Now commit any transactions, so that unreported errors after
 379                 // output() don't roll back the whole DB transaction
 380                 $factory = wfGetLBFactory();
 381                 $factory->commitMasterChanges();
 382                 // Output everything!
 383                 $output->output();
 384                 // Do any deferred jobs
 385                 $this->doUpdates( $deferredUpdates );
 386                 $this->doJobs();
 387                 wfProfileOut( __METHOD__ );
 388         }
 389
 390         /**
 391          * Deferred updates aren't really deferred anymore. It's important to report
 392          * errors to the user, and that means doing this before OutputPage::output().
 393          * Note that for page saves, the client will wait until the script exits
 394          * anyway before following the redirect.
 395          *
 396          * @param $updates array of objects that hold an update to do
 397          */
 398         function doUpdates( &$updates ) {
 399                 wfProfileIn( __METHOD__ );
 400                 /* No need to get master connections in case of empty updates array */
 401                 if (!$updates) {
 402                         wfProfileOut( __METHOD__ );
 403                         return;
 404                 }
 405
 406                 $dbw = wfGetDB( DB_MASTER );
 407                 foreach( $updates as $up ) {
 408                         $up->doUpdate();
 409
 410                         // Commit after every update to prevent lock contention
 411                         if( $dbw->trxLevel() ) {
 412                                 $dbw->commit();
 413                         }
 414                 }
 415                 wfProfileOut( __METHOD__ );
 416         }
 417
 418         /**
 419          * Do a job from the job queue
 420          */
 421         function doJobs() {
 422                 $jobRunRate = $this->getVal( 'JobRunRate' );
 423
 424                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 425                         return;
 426                 }
 427                 if( $jobRunRate < 1 ) {
 428                         $max = mt_getrandmax();
 429                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 430                                 return;
 431                         }
 432                         $n = 1;
 433                 } else {
 434                         $n = intval( $jobRunRate );
 435                 }
 436
 437                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 438                         $output = $job->toString() . "\n";
 439                         $t = -wfTime();
 440                         $success = $job->run();
 441                         $t += wfTime();
 442                         $t = round( $t*1000 );
 443                         if( !$success ) {
 444                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 445                         } else {
 446                                 $output .= "Success, Time: $t ms\n";
 447                         }
 448                         wfDebugLog( 'jobqueue', $output );
 449                 }
 450         }
 451
 452         /**
 453          * Ends this task peacefully
 454          */
 455         function restInPeace() {
 456                 wfLogProfilingData();
 457                 // Commit and close up!
 458                 $factory = wfGetLBFactory();
 459                 $factory->commitMasterChanges();
 460                 $factory->shutdown();
 461                 wfDebug( "Request ended normally\n" );
 462         }
 463
 464         /**
 465          * Perform one of the "standard" actions
 466          *
 467          * @param $output OutputPage
 468          * @param $article Article
 469          * @param $title Title
 470          * @param $user User
 471          * @param $request WebRequest
 472          */
 473         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 474                 wfProfileIn( __METHOD__ );
 475
 476                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 477                         wfProfileOut( __METHOD__ );
 478                         return;
 479                 }
 480
 481                 $action = $this->getVal( 'Action' );
 482                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 483                         /* No such action; this will switch to the default case */
 484                         $action = 'nosuchaction';
 485                 }
 486
 487                 // Workaround for bug #20966: inability of IE to provide an action dependent
 488                 // on which submit button is clicked.
 489                 if ( $action === 'historysubmit' ) {
 490                         if ( $request->getBool( 'revisiondelete' ) ) {
 491                                 $action = 'revisiondelete';
 492                         } elseif ( $request->getBool( 'revisionmove' ) ) {
 493                                 $action = 'revisionmove';
 494                         } else {
 495                                 $action = 'view';
 496                         }
 497                 }
 498
 499                 switch( $action ) {
 500                         case 'view':
 501                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 502                                 $article->view();
 503                                 break;
 504                         case 'raw': // includes JS/CSS
 505                                 wfProfileIn( __METHOD__.'-raw' );
 506                                 $raw = new RawPage( $article );
 507                                 $raw->view();
 508                                 wfProfileOut( __METHOD__.'-raw' );
 509                                 break;
 510                         case 'watch':
 511                         case 'unwatch':
 512                         case 'delete':
 513                         case 'revert':
 514                         case 'rollback':
 515                         case 'protect':
 516                         case 'unprotect':
 517                         case 'info':
 518                         case 'markpatrolled':
 519                         case 'render':
 520                         case 'deletetrackback':
 521                         case 'purge':
 522                                 $article->$action();
 523                                 break;
 524                         case 'print':
 525                                 $article->view();
 526                                 break;
 527                         case 'dublincore':
 528                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 529                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 530                                 } else {
 531                                         $rdf = new DublinCoreRdf( $article );
 532                                         $rdf->show();
 533                                 }
 534                                 break;
 535                         case 'creativecommons':
 536                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 537                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 538                                 } else {
 539                                         $rdf = new CreativeCommonsRdf( $article );
 540                                         $rdf->show();
 541                                 }
 542                                 break;
 543                         case 'credits':
 544                                 Credits::showPage( $article );
 545                                 break;
 546                         case 'submit':
 547                                 if( session_id() == '' ) {
 548                                         /* Send a cookie so anons get talk message notifications */
 549                                         wfSetupSession();
 550                                 }
 551                                 /* Continue... */
 552                         case 'edit':
 553                         case 'editredlink':
 554                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 555                                         $internal = $request->getVal( 'internaledit' );
 556                                         $external = $request->getVal( 'externaledit' );
 557                                         $section = $request->getVal( 'section' );
 558                                         $oldid = $request->getVal( 'oldid' );
 559                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 560                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 561                                                 $editor = new EditPage( $article );
 562                                                 $editor->submit();
 563                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 564                                                 $mode = $request->getVal( 'mode' );
 565                                                 $extedit = new ExternalEdit( $article, $mode );
 566                                                 $extedit->edit();
 567                                         }
 568                                 }
 569                                 break;
 570                         case 'history':
 571                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 572                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 573                                 }
 574                                 $history = new HistoryPage( $article );
 575                                 $history->history();
 576                                 break;
 577                         case 'revisiondelete':
 578                                 // For show/hide submission from history page
 579                                 $special = SpecialPage::getPage( 'Revisiondelete' );
 580                                 $special->execute( '' );
 581                                 break;
 582                         case 'revisionmove':
 583                                 // For revision move submission from history page
 584                                 $special = SpecialPage::getPage( 'RevisionMove' );
 585                                 $special->execute( '' );
 586                                 break;
 587                         default:
 588                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 589                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 590                                 }
 591                 }
 592                 wfProfileOut( __METHOD__ );
 593
 594         }
 595
 596 }; /* End of class MediaWiki */