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