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