includes/Wiki.php

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