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         /**
  12          * Constructor
  13          */
  14         function MediaWiki () {
  15                 $this->GET = $_GET;
  16         }
  17
  18         /**
  19          * Stores key/value pairs to circumvent global variables
  20          * Note that keys are case-insensitive!
  21          */
  22         function setVal( $key, &$value ) {
  23                 $key = strtolower( $key );
  24                 $this->params[$key] =& $value;
  25         }
  26
  27         /**
  28          * Retieves key/value pairs to circumvent global variables
  29          * Note that keys are case-insensitive!
  30          */
  31         function getVal( $key, $default = "" ) {
  32                 $key = strtolower( $key );
  33                 if( isset( $this->params[$key] ) ) {
  34                         return $this->params[$key];
  35                 }
  36                 return $default;
  37         }
  38
  39         /**
  40          * Wrapper for getrusage, if it exists
  41          * getrusage() does not exist on the Window$ platform, catching this
  42          */
  43         function getRUsage() {
  44                 if ( function_exists ( 'getrusage' ) ) {
  45                         return getrusage();
  46                 } else {
  47                         return array();
  48                 }
  49         }
  50
  51         /**
  52          * CHeck for $GLOBALS vulnerability
  53          */
  54         function ckeckGlobalsVulnerability() {
  55                 @ini_set( 'allow_url_fopen', 0 ); # For security...
  56                 if ( isset( $_REQUEST['GLOBALS'] ) ) {
  57                         die( '<a href="http://www.hardened-php.net/index.76.html">$GLOBALS overwrite vulnerability</a>');
  58                 }
  59         }
  60
  61         /**
  62          * Checks if the wiki is set up at all, or configured but not activated
  63          */
  64         function checkSetup() {
  65                 if ( file_exists( './LocalSettings.php' ) ) {
  66                         /* LocalSettings exists, commerce normally */
  67                         return;
  68                 }
  69
  70                 /* LocalSettings is not in the right place, do something */
  71                 $IP = ".";
  72                 require_once( 'includes/DefaultSettings.php' ); # used for printing the version
  73                 $out = file_get_contents( "./setup_message.html" );
  74                 $out = str_replace( "$1", $wgVersion, $out );
  75                 if ( file_exists( 'config/LocalSettings.php' ) ) {
  76                         $msg = "To complete the installation, move <tt>config/LocalSettings.php</tt> to the parent directory.";
  77                 } else {
  78                         $msg = "Please <a href='config/index.php' title='setup'>setup the wiki</a> first.";
  79                 }
  80                 $out = str_replace( "$2", $msg, $out );
  81                 echo $out;
  82                 die();
  83         }
  84
  85         /**
  86          * Reads title and action values from request
  87          */
  88         function initializeActionTitle () {
  89                 $request = $this->getVal( 'Request' );
  90                 $this->setVal( 'action', $request->getVal( 'action', 'view' ) );
  91                 $this->setVal( 'urltitle', $request->getVal( 'title' ) );
  92         }
  93
  94         /**
  95          * Initialization of ... everything
  96          @return Article either the object to become $wgArticle, or NULL
  97          */
  98         function initialize ( &$title, &$output, &$user ) {
  99                 wfProfileIn( 'MediaWiki::initialize' );
 100                 $request = $this->getVal( 'Request' );
 101                 $this->preliminaryChecks ( $title, $output );
 102                 $article = NULL;
 103                 if ( !$this->initializeSpecialCases( $title, $output ) ) {
 104                         $article = $this->initializeArticle( $title );
 105                         if( is_object( $article ) ) {
 106                                 $this->performAction( $output, $article, $title, $user );
 107                         } elseif( is_string( $article ) ) {
 108                                 $output->redirect( $article );
 109                         } else {
 110                                 wfDebugDieBacktrace( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
 111                         }
 112                 }
 113                 wfProfileOut( 'MediaWiki::initialize' );
 114                 return $article;
 115         }
 116
 117         /**
 118          * Checks some initial queries
 119          */
 120         function checkInitialQueries( &$output, $lang) {
 121                 wfProfileIn( 'MediaWiki::checkInitialQueries' );
 122                 $request = $this->getVal( 'Request' );
 123                 $action = $this->getVal( 'action' );
 124                 $title = $this->getVal( 'urltitle' );
 125                 if ($request->getVal( 'printable' ) == 'yes') {
 126                         $output->setPrintable();
 127                 }
 128
 129                 $ret = NULL;
 130
 131
 132                 if ( '' == $title && 'delete' != $action ) {
 133                         $ret = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 134                 } elseif ( $curid = $request->getInt( 'curid' ) ) {
 135                         # URLs like this are generated by RC, because rc_title isn't always accurate
 136                         $ret = Title::newFromID( $curid );
 137                 } else {
 138                         $ret = Title::newFromURL( $title );
 139                         /* check variant links so that interwiki links don't have to worry about
 140                            the possible different language variants
 141                         */
 142                         if( count($lang->getVariants()) > 1 && !is_null($ret) && $ret->getArticleID() == 0 )
 143                                 $lang->findVariantLink( $title, $ret );
 144
 145                 }
 146                 wfProfileOut( 'MediaWiki::checkInitialQueries' );
 147                 return $ret;
 148         }
 149
 150         /**
 151          * Checks for search query and anon-cannot-read case
 152          */
 153         function preliminaryChecks ( &$title, &$output ) {
 154                 $request = $this->getVal( 'Request' );
 155                 # Debug statement for user levels
 156                 // print_r($wgUser);
 157
 158                 $search = $request->getText( 'search' );
 159                 if( !is_null( $search ) && $search !== '' ) {
 160                         // Compatibility with old search URLs which didn't use Special:Search
 161                         // Do this above the read whitelist check for security...
 162                         $title = Title::makeTitle( NS_SPECIAL, 'Search' );
 163                 }
 164                 $this->setVal( "Search", $search );
 165
 166                 # If the user is not logged in, the Namespace:title of the article must be in
 167                 # the Read array in order for the user to see it. (We have to check here to
 168                 # catch special pages etc. We check again in Article::view())
 169                 if ( !is_null( $title ) && !$title->userCanRead() ) {
 170                         $output->loginToUse();
 171                         $output->output();
 172                         exit;
 173                 }
 174
 175         }
 176
 177         /**
 178          * Initialize the object to be known as $wgArticle for special cases
 179          */
 180         function initializeSpecialCases ( &$title, &$output ) {
 181                 wfProfileIn( 'MediaWiki::initializeSpecialCases' );
 182                 $request = $this->getVal( 'Request' );
 183
 184                 $search = $this->getVal('Search');
 185                 $action = $this->getVal('Action');
 186                 if( !$this->getVal('DisableInternalSearch') && !is_null( $search ) && $search !== '' ) {
 187                         require_once( 'includes/SpecialSearch.php' );
 188                         $title = Title::makeTitle( NS_SPECIAL, 'Search' );
 189                         wfSpecialSearch();
 190                 } else if( !$title or $title->getDBkey() == '' ) {
 191                         $title = Title::newFromText( wfMsgForContent( 'badtitle' ) );
 192                         $output->errorpage( 'badtitle', 'badtitletext' );
 193                 } else if ( $title->getInterwiki() != '' ) {
 194                         if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
 195                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 196                         } else {
 197                                 $url = $title->getFullURL();
 198                         }
 199                         /* Check for a redirect loop */
 200                         if ( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 201                                 $output->redirect( $url );
 202                         } else {
 203                                 $title = Title::newFromText( wfMsgForContent( 'badtitle' ) );
 204                                 $output->errorpage( 'badtitle', 'badtitletext' );
 205                         }
 206                 } else if ( ( $action == 'view' ) &&
 207                         (!isset( $this->GET['title'] ) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
 208                         !count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
 209                 {
 210                         /* Redirect to canonical url, make it a 301 to allow caching */
 211                         $output->setSquidMaxage( 1200 );
 212                         $output->redirect( $title->getFullURL(), '301');
 213                 } else if ( NS_SPECIAL == $title->getNamespace() ) {
 214                         /* actions that need to be made when we have a special pages */
 215                         SpecialPage::executePath( $title );
 216                 } else {
 217                         /* No match to special cases */
 218                         wfProfileOut( 'MediaWiki::initializeSpecialCases' );
 219                         return false;
 220                 }
 221                 /* Did match a special case */
 222                 wfProfileOut( 'MediaWiki::initializeSpecialCases' );
 223                 return true;
 224         }
 225
 226         /**
 227          * Create an Article object of the appropriate class for the given page.
 228          * @param Title $title
 229          * @return Article
 230          */
 231         function articleFromTitle( $title ) {
 232                 if( NS_MEDIA == $title->getNamespace() ) {
 233                         // FIXME: where should this go?
 234                         $title = Title::makeTitle( NS_IMAGE, $title->getDBkey() );
 235                 }
 236
 237                 switch( $title->getNamespace() ) {
 238                 case NS_IMAGE:
 239                         require_once( 'includes/ImagePage.php' );
 240                         return new ImagePage( $title );
 241                 case NS_CATEGORY:
 242                         require_once( 'includes/CategoryPage.php' );
 243                         return new CategoryPage( $title );
 244                 default:
 245                         return new Article( $title );
 246                 }
 247         }
 248
 249         /**
 250          * Initialize the object to be known as $wgArticle for "standard" actions
 251          * Create an Article object for the page, following redirects if needed.
 252          * @param Title $title
 253          * @return mixed an Article, or a string to redirect to another URL
 254          */
 255         function initializeArticle( $title ) {
 256                 wfProfileIn( 'MediaWiki::initializeArticle' );
 257
 258                 $request = $this->getVal( 'Request' );
 259                 $action = $this->getVal('Action');
 260                 $article = $this->articleFromTitle( $title );
 261
 262                 // Namespace might change when using redirects
 263                 if( $action == 'view' && !$request->getVal( 'oldid' ) && $request->getVal( 'redirect' ) != 'no' ) {
 264                         $target = $article->followRedirect();
 265                         if( is_string( $target ) ) {
 266                                 global $wgDisableHardRedirects;
 267                                 if( !$wgDisableHardRedirects ) {
 268                                         // we'll need to redirect
 269                                         return $target;
 270                                 }
 271                         }
 272                         if( is_object( $target ) ) {
 273                                 // evil globals hack!
 274                                 global $wgTitle;
 275                                 $wgTitle = $target;
 276
 277                                 $article = $this->articleFromTitle( $target );
 278                                 $article->setRedirectedFrom( $title );
 279                         }
 280                 }
 281                 wfProfileOut( 'MediaWiki::initializeArticle' );
 282                 return $article;
 283         }
 284
 285         /**
 286          * Cleaning up by doing deferred updates, calling loadbalancer and doing the output
 287          */
 288         function finalCleanup ( &$deferredUpdates, &$loadBalancer, &$output ) {
 289                 wfProfileIn( 'MediaWiki::finalCleanup' );
 290                 $this->doUpdates( $deferredUpdates );
 291                 $loadBalancer->saveMasterPos();
 292                 # Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
 293                 $loadBalancer->commitAll();
 294                 $output->output();
 295                 wfProfileOut( 'MediaWiki::finalCleanup' );
 296         }
 297
 298         /**
 299          * Deferred updates aren't really deferred anymore. It's important to report errors to the
 300          * user, and that means doing this before OutputPage::output(). Note that for page saves,
 301          * the client will wait until the script exits anyway before following the redirect.
 302          */
 303         function doUpdates ( &$updates ) {
 304                 wfProfileIn( 'MediaWiki::doUpdates' );
 305                 foreach( $updates as $up ) {
 306                         $up->doUpdate();
 307                 }
 308                 wfProfileOut( 'MediaWiki::doUpdates' );
 309         }
 310
 311         /**
 312          * Ends this task peacefully
 313          */
 314         function restInPeace ( &$loadBalancer ) {
 315                 wfProfileClose();
 316                 logProfilingData();
 317                 $loadBalancer->closeAll();
 318                 wfDebug( "Request ended normally\n" );
 319         }
 320
 321         /**
 322          * Perform one of the "standard" actions
 323          */
 324         function performAction( &$output, &$article, &$title, &$user ) {
 325                 wfProfileIn( 'MediaWiki::performAction' );
 326
 327                 $request = $this->getVal( 'Request' );
 328                 $action = $this->getVal('Action');
 329                 if( in_array( $action, $this->getVal('DisabledActions',array()) ) ) {
 330                         /* No such action; this will switch to the default case */
 331                         $action = "nosuchaction";
 332                 }
 333
 334                 switch( $action ) {
 335                         case 'view':
 336                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 337                                 $article->view();
 338                                 break;
 339                         case 'watch':
 340                         case 'unwatch':
 341                         case 'delete':
 342                         case 'revert':
 343                         case 'rollback':
 344                         case 'protect':
 345                         case 'unprotect':
 346                         case 'info':
 347                         case 'markpatrolled':
 348                         case 'validate':
 349                         case 'render':
 350                         case 'deletetrackback':
 351                         case 'purge':
 352                                 $article->$action();
 353                                 break;
 354                         case 'print':
 355                                 $article->view();
 356                                 break;
 357                         case 'dublincore':
 358                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 359                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 360                                 } else {
 361                                         require_once( 'includes/Metadata.php' );
 362                                         wfDublinCoreRdf( $article );
 363                                 }
 364                                 break;
 365                         case 'creativecommons':
 366                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 367                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 368                                 } else {
 369                                         require_once( 'includes/Metadata.php' );
 370                                         wfCreativeCommonsRdf( $article );
 371                                 }
 372                                 break;
 373                         case 'credits':
 374                                 require_once( 'includes/Credits.php' );
 375                                 showCreditsPage( $article );
 376                                 break;
 377                         case 'submit':
 378                                 if( !$this->getVal( 'CommandLineMode' ) && !$request->checkSessionCookie() ) {
 379                                         /* Send a cookie so anons get talk message notifications */
 380                                         User::SetupSession();
 381                                 }
 382                                 /* Continue... */
 383                         case 'edit':
 384                                 $internal = $request->getVal( 'internaledit' );
 385                                 $external = $request->getVal( 'externaledit' );
 386                                 $section = $request->getVal( 'section' );
 387                                 $oldid = $request->getVal( 'oldid' );
 388                                 if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 389                                    $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 390                                         require_once( 'includes/EditPage.php' );
 391                                         $editor = new EditPage( $article );
 392                                         $editor->submit();
 393                                 } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 394                                         require_once( 'includes/ExternalEdit.php' );
 395                                         $mode = $request->getVal( 'mode' );
 396                                         $extedit = new ExternalEdit( $article, $mode );
 397                                         $extedit->edit();
 398                                 }
 399                                 break;
 400                         case 'history':
 401                                 if( $_SERVER['REQUEST_URI'] == $title->getInternalURL( 'action=history' ) ) {
 402                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 403                                 }
 404                                 require_once( 'includes/PageHistory.php' );
 405                                 $history = new PageHistory( $article );
 406                                 $history->history();
 407                                 break;
 408                         case 'raw':
 409                                 require_once( 'includes/RawPage.php' );
 410                                 $raw = new RawPage( $article );
 411                                 $raw->view();
 412                                 break;
 413                         default:
 414                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 415                                         $output->errorpage( 'nosuchaction', 'nosuchactiontext' );
 416                                 }
 417                 wfProfileOut( 'MediaWiki::performAction' );
 418         }
 419
 420
 421         }
 422
 423 }; /* End of class MediaWiki */
 424
 425 ?>