includes/Wiki.php

   1 <?php
   2 /**
   3  * MediaWiki is the to-be base class for this whole project
   4  */
   5
   6 class MediaWiki {
   7
   8         var $GET; /* Stores the $_GET variables at time of creation, can be changed */
   9         var $params = array();
  10
  11         /** Constructor. It just save the $_GET variable */
  12         function __construct() {
  13                 $this->GET = $_GET;
  14         }
  15
  16         /**
  17          * Stores key/value pairs to circumvent global variables
  18          * Note that keys are case-insensitive!
  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         function getVal( $key, $default = '' ) {
  30                 $key = strtolower( $key );
  31                 if( isset( $this->params[$key] ) ) {
  32                         return $this->params[$key];
  33                 }
  34                 return $default;
  35         }
  36
  37         /**
  38          * Initialization of ... everything
  39          @return Article either the object to become $wgArticle, or NULL
  40          */
  41         function initialize ( &$title, &$output, &$user, $request) {
  42                 wfProfileIn( 'MediaWiki::initialize' );
  43                 $this->preliminaryChecks ( $title, $output, $request ) ;
  44                 $article = NULL;
  45                 if ( !$this->initializeSpecialCases( $title, $output, $request ) ) {
  46                         $article = $this->initializeArticle( $title, $request );
  47                         if( is_object( $article ) ) {
  48                                 $this->performAction( $output, $article, $title, $user, $request );
  49                         } elseif( is_string( $article ) ) {
  50                                 $output->redirect( $article );
  51                         } else {
  52                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
  53                         }
  54                 }
  55                 wfProfileOut( 'MediaWiki::initialize' );
  56                 return $article;
  57         }
  58
  59         function checkMaxLag( $maxLag ) {
  60                 global $wgLoadBalancer, $wgShowHostnames;
  61                 list( $host, $lag ) = $wgLoadBalancer->getMaxLag();
  62                 if ( $lag > $maxLag ) {
  63                         header( 'HTTP/1.1 503 Service Unavailable' );
  64                         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
  65                         header( 'X-Database-Lag: ' . intval( $lag ) );
  66                         header( 'Content-Type: text/plain' );
  67                         if( $wgShowHostnames ) {
  68                                 echo "Waiting for $host: $lag seconds lagged\n";
  69                         } else {
  70                                 echo "Waiting for a database server: $lag seconds lagged\n";
  71                         }
  72                         return false;
  73                 } else {
  74                         return true;
  75                 }
  76         }
  77
  78
  79         /**
  80          * Checks some initial queries
  81          * Note that $title here is *not* a Title object, but a string!
  82          */
  83         function checkInitialQueries( $title,$action,&$output,$request, $lang) {
  84                 if ($request->getVal( 'printable' ) == 'yes') {
  85                         $output->setPrintable();
  86                 }
  87
  88                 $ret = NULL ;
  89
  90
  91                 if ( '' == $title && 'delete' != $action ) {
  92                         $ret = Title::newMainPage();
  93                 } elseif ( $curid = $request->getInt( 'curid' ) ) {
  94                         # URLs like this are generated by RC, because rc_title isn't always accurate
  95                         $ret = Title::newFromID( $curid );
  96                 } else {
  97                         $ret = Title::newFromURL( $title );
  98                         /* check variant links so that interwiki links don't have to worry about
  99                            the possible different language variants
 100                         */
 101                         if( count($lang->getVariants()) > 1 && !is_null($ret) && $ret->getArticleID() == 0 )
 102                                 $lang->findVariantLink( $title, $ret );
 103
 104                 }
 105                 if ( ( $oldid = $request->getInt( 'oldid' ) )
 106                         && ( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) ) {
 107                         // Allow oldid to override a changed or missing title.
 108                         $rev = Revision::newFromId( $oldid );
 109                         if( $rev ) {
 110                                 $ret = $rev->getTitle();
 111                         }
 112                 }
 113                 return $ret ;
 114         }
 115
 116         /**
 117          * Checks for search query and anon-cannot-read case
 118          */
 119         function preliminaryChecks ( &$title, &$output, $request ) {
 120
 121                 if( $request->getCheck( 'search' ) ) {
 122                         // Compatibility with old search URLs which didn't use Special:Search
 123                         // Just check for presence here, so blank requests still
 124                         // show the search page when using ugly URLs (bug 8054).
 125
 126                         // Do this above the read whitelist check for security...
 127                         $title = SpecialPage::getTitleFor( 'Search' );
 128                 }
 129
 130                 # If the user is not logged in, the Namespace:title of the article must be in
 131                 # the Read array in order for the user to see it. (We have to check here to
 132                 # catch special pages etc. We check again in Article::view())
 133                 if ( !is_null( $title ) && !$title->userCanRead() ) {
 134                         $output->loginToUse();
 135                         $output->output();
 136                         exit;
 137                 }
 138
 139         }
 140
 141         /**
 142          * Initialize the object to be known as $wgArticle for special cases
 143          */
 144         function initializeSpecialCases ( &$title, &$output, $request ) {
 145                 global $wgRequest;
 146                 wfProfileIn( 'MediaWiki::initializeSpecialCases' );
 147
 148                 $action = $this->getVal('Action');
 149                 if( !$title or $title->getDBkey() == '' ) {
 150                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 151                         # Die now before we mess up $wgArticle and the skin stops working
 152                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 153                 } else if ( $title->getInterwiki() != '' ) {
 154                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 155                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 156                         } else {
 157                                 $url = $title->getFullURL();
 158                         }
 159                         /* Check for a redirect loop */
 160                         if ( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 161                                 $output->redirect( $url );
 162                         } else {
 163                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 164                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 165                         }
 166                 } else if ( ( $action == 'view' ) && !$wgRequest->wasPosted() &&
 167                         (!isset( $this->GET['title'] ) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
 168                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 169                 {
 170                         $targetUrl = $title->getFullURL();
 171                         // Redirect to canonical url, make it a 301 to allow caching
 172                         global $wgUsePathInfo;
 173                         if( $targetUrl == $wgRequest->getFullRequestURL() ) {
 174                                 $message = "Redirect loop detected!\n\n" .
 175                                         "This means the wiki got confused about what page was " .
 176                                         "requested; this sometimes happens when moving a wiki " .
 177                                         "to a new server or changing the server configuration.\n\n";
 178
 179                                 if( $wgUsePathInfo ) {
 180                                         $message .= "The wiki is trying to interpret the page " .
 181                                                 "title from the URL path portion (PATH_INFO), which " .
 182                                                 "sometimes fails depending on the web server. Try " .
 183                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 184                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 185                                                 "is correct.";
 186                                 } else {
 187                                         $message .= "Your web server was detected as possibly not " .
 188                                                 "supporting URL path components (PATH_INFO) correctly; " .
 189                                                 "check your LocalSettings.php for a customized " .
 190                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 191                                                 "to true.";
 192                                 }
 193                                 wfHttpError( 500, "Internal error", $message );
 194                                 return false;
 195                         } else {
 196                                 $output->setSquidMaxage( 1200 );
 197                                 $output->redirect( $targetUrl, '301');
 198                         }
 199                 } else if ( NS_SPECIAL == $title->getNamespace() ) {
 200                         /* actions that need to be made when we have a special pages */
 201                         SpecialPage::executePath( $title );
 202                 } else {
 203                         /* No match to special cases */
 204                         wfProfileOut( 'MediaWiki::initializeSpecialCases' );
 205                         return false;
 206                 }
 207                 /* Did match a special case */
 208                 wfProfileOut( 'MediaWiki::initializeSpecialCases' );
 209                 return true;
 210         }
 211
 212         /**
 213          * Create an Article object of the appropriate class for the given page.
 214          * @param Title $title
 215          * @return Article
 216          */
 217         static function articleFromTitle( $title ) {
 218                 $article = null;
 219                 wfRunHooks('ArticleFromTitle', array( &$title, &$article ) );
 220                 if ( $article ) {
 221                         return $article;
 222                 }
 223
 224                 if( NS_MEDIA == $title->getNamespace() ) {
 225                         // FIXME: where should this go?
 226                         $title = Title::makeTitle( NS_IMAGE, $title->getDBkey() );
 227                 }
 228
 229                 switch( $title->getNamespace() ) {
 230                 case NS_IMAGE:
 231                         return new ImagePage( $title );
 232                 case NS_CATEGORY:
 233                         return new CategoryPage( $title );
 234                 default:
 235                         return new Article( $title );
 236                 }
 237         }
 238
 239         /**
 240          * Initialize the object to be known as $wgArticle for "standard" actions
 241          * Create an Article object for the page, following redirects if needed.
 242          * @param Title $title
 243          * @param Request $request
 244          * @param string $action
 245          * @return mixed an Article, or a string to redirect to another URL
 246          */
 247         function initializeArticle( $title, $request ) {
 248                 global $wgTitle;
 249                 wfProfileIn( 'MediaWiki::initializeArticle' );
 250
 251                 $action = $this->getVal('Action');
 252                 $article = $this->articleFromTitle( $title );
 253
 254                 // Namespace might change when using redirects
 255                 if( $action == 'view' && !$request->getVal( 'oldid' ) &&
 256                                                 $request->getVal( 'redirect' ) != 'no' ) {
 257
 258                         $dbr = wfGetDB(DB_SLAVE);
 259                         $article->loadPageData($article->pageDataFromTitle($dbr, $title));
 260
 261                         /* Follow redirects only for... redirects */
 262                         if ($article->mIsRedirect) {
 263                                 $target = $article->followRedirect();
 264                                 if( is_string( $target ) ) {
 265                                         global $wgDisableHardRedirects;
 266                                         if( !$wgDisableHardRedirects ) {
 267                                                 // we'll need to redirect
 268                                                 return $target;
 269                                         }
 270                                 }
 271                                 if( is_object( $target ) ) {
 272                                         /* Rewrite environment to redirected article */
 273                                         $rarticle = $this->articleFromTitle($target);
 274                                         $rarticle->loadPageData($rarticle->pageDataFromTitle($dbr,$target));
 275                                         if ($rarticle->mTitle->mArticleID) {
 276                                                 $article = $rarticle;
 277                                                 $wgTitle = $target;
 278                                                 $article->setRedirectedFrom( $title );
 279                                         } else {
 280                                                 $wgTitle = $title;
 281                                         }
 282                                 }
 283                         } else {
 284                                 $wgTitle = $article->mTitle;
 285                         }
 286                 }
 287                 wfProfileOut( 'MediaWiki::initializeArticle' );
 288                 return $article;
 289         }
 290
 291         /**
 292          * Cleaning up by doing deferred updates, calling loadbalancer and doing the output
 293          */
 294         function finalCleanup ( &$deferredUpdates, &$loadBalancer, &$output ) {
 295                 wfProfileIn( 'MediaWiki::finalCleanup' );
 296                 $this->doUpdates( $deferredUpdates );
 297                 $this->doJobs();
 298                 $loadBalancer->saveMasterPos();
 299                 # Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
 300                 $loadBalancer->commitAll();
 301                 $output->output();
 302                 wfProfileOut( 'MediaWiki::finalCleanup' );
 303         }
 304
 305         /**
 306          * Deferred updates aren't really deferred anymore. It's important to report errors to the
 307          * user, and that means doing this before OutputPage::output(). Note that for page saves,
 308          * the client will wait until the script exits anyway before following the redirect.
 309          */
 310         function doUpdates ( &$updates ) {
 311                 wfProfileIn( 'MediaWiki::doUpdates' );
 312                 $dbw = wfGetDB( DB_MASTER );
 313                 foreach( $updates as $up ) {
 314                         $up->doUpdate();
 315
 316                         # Commit after every update to prevent lock contention
 317                         if ( $dbw->trxLevel() ) {
 318                                 $dbw->commit();
 319                         }
 320                 }
 321                 wfProfileOut( 'MediaWiki::doUpdates' );
 322         }
 323
 324         /**
 325          * Do a job from the job queue
 326          */
 327         function doJobs() {
 328                 global $wgJobRunRate;
 329
 330                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 331                         return;
 332                 }
 333                 if ( $wgJobRunRate < 1 ) {
 334                         $max = mt_getrandmax();
 335                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 336                                 return;
 337                         }
 338                         $n = 1;
 339                 } else {
 340                         $n = intval( $wgJobRunRate );
 341                 }
 342
 343                 while ( $n-- && false != ($job = Job::pop())) {
 344                         $output = $job->toString() . "\n";
 345                         $t = -wfTime();
 346                         $success = $job->run();
 347                         $t += wfTime();
 348                         $t = round( $t*1000 );
 349                         if ( !$success ) {
 350                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 351                         } else {
 352                                 $output .= "Success, Time: $t ms\n";
 353                         }
 354                         wfDebugLog( 'jobqueue', $output );
 355                 }
 356         }
 357
 358         /**
 359          * Ends this task peacefully
 360          */
 361         function restInPeace ( &$loadBalancer ) {
 362                 wfLogProfilingData();
 363                 $loadBalancer->closeAll();
 364                 wfDebug( "Request ended normally\n" );
 365         }
 366
 367         /**
 368          * Perform one of the "standard" actions
 369          */
 370         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 371
 372                 wfProfileIn( 'MediaWiki::performAction' );
 373
 374                 $action = $this->getVal('Action');
 375                 if( in_array( $action, $this->getVal('DisabledActions',array()) ) ) {
 376                         /* No such action; this will switch to the default case */
 377                         $action = 'nosuchaction';
 378                 }
 379
 380                 switch( $action ) {
 381                         case 'view':
 382                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 383                                 $article->view();
 384                                 break;
 385                         case 'watch':
 386                         case 'unwatch':
 387                         case 'delete':
 388                         case 'revert':
 389                         case 'rollback':
 390                         case 'protect':
 391                         case 'unprotect':
 392                         case 'info':
 393                         case 'markpatrolled':
 394                         case 'render':
 395                         case 'deletetrackback':
 396                         case 'purge':
 397                                 $article->$action();
 398                                 break;
 399                         case 'print':
 400                                 $article->view();
 401                                 break;
 402                         case 'dublincore':
 403                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 404                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 405                                 } else {
 406                                         require_once( 'includes/Metadata.php' );
 407                                         wfDublinCoreRdf( $article );
 408                                 }
 409                                 break;
 410                         case 'creativecommons':
 411                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 412                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 413                                 } else {
 414                                         require_once( 'includes/Metadata.php' );
 415                                         wfCreativeCommonsRdf( $article );
 416                                 }
 417                                 break;
 418                         case 'credits':
 419                                 require_once( 'includes/Credits.php' );
 420                                 showCreditsPage( $article );
 421                                 break;
 422                         case 'submit':
 423                                 if( session_id() == '' ) {
 424                                         /* Send a cookie so anons get talk message notifications */
 425                                         wfSetupSession();
 426                                 }
 427                                 /* Continue... */
 428                         case 'edit':
 429                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 430                                         $internal = $request->getVal( 'internaledit' );
 431                                         $external = $request->getVal( 'externaledit' );
 432                                         $section = $request->getVal( 'section' );
 433                                         $oldid = $request->getVal( 'oldid' );
 434                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 435                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 436                                                 $editor = new EditPage( $article );
 437                                                 $editor->submit();
 438                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 439                                                 $mode = $request->getVal( 'mode' );
 440                                                 $extedit = new ExternalEdit( $article, $mode );
 441                                                 $extedit->edit();
 442                                         }
 443                                 }
 444                                 break;
 445                         case 'history':
 446                                 global $wgRequest;
 447                                 if( $wgRequest->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 448                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 449                                 }
 450                                 $history = new PageHistory( $article );
 451                                 $history->history();
 452                                 break;
 453                         case 'raw':
 454                                 $raw = new RawPage( $article );
 455                                 $raw->view();
 456                                 break;
 457                         default:
 458                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 459                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 460                                 }
 461                 }
 462                 wfProfileOut( 'MediaWiki::performAction' );
 463
 464         }
 465
 466 }; /* End of class MediaWiki */
 467
 468