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