includes/Wiki.php

   1 <?php
   2 /**
   3  * MediaWiki is the to-be base class for this whole project
   4  *
   5  * @internal documentation reviewed 15 Mar 2010
   6  */
   7 class MediaWiki {
   8
   9         /**
  10          * Array of options which may or may not be used
  11          * FIXME: this seems currently to be a messy halfway-house between globals
  12          *     and a config object.  Pick one and run with it
  13          * @var array
  14          */
  15         private $params = array();
  16
  17         /**
  18          * TODO: fold $output, etc, into this
  19          * @var RequestContext
  20          */
  21         private $context;
  22
  23         /**
  24          * Stores key/value pairs to circumvent global variables
  25          * Note that keys are case-insensitive!
  26          *
  27          * @param $key String: key to store
  28          * @param $value Mixed: value to put for the key
  29          */
  30         public function setVal( $key, &$value ) {
  31                 $key = strtolower( $key );
  32                 $this->params[$key] =& $value;
  33         }
  34
  35         /**
  36          * Retrieves key/value pairs to circumvent global variables
  37          * Note that keys are case-insensitive!
  38          *
  39          * @param $key String: key to get
  40          * @param $default string default value, defaults to empty string
  41          * @return $default Mixed: default value if if the key doesn't exist
  42          */
  43         public function getVal( $key, $default = '' ) {
  44                 $key = strtolower( $key );
  45                 if ( isset( $this->params[$key] ) ) {
  46                         return $this->params[$key];
  47                 }
  48                 return $default;
  49         }
  50
  51         public function request( WebRequest $x = null ){
  52                 return wfSetVar( $this->context->request, $x );
  53         }
  54
  55         public function output( OutputPage $x = null ){
  56                 return wfSetVar( $this->context->output, $x );
  57         }
  58
  59         public function __construct( RequestContext $context ){
  60                 $this->context = $context;
  61                 $this->context->setTitle( $this->parseTitle() );
  62         }
  63
  64         /**
  65          * Initialization of ... everything
  66          * Performs the request too
  67          *
  68          * @param $article Article
  69          */
  70         public function performRequestForTitle( &$article ) {
  71                 wfProfileIn( __METHOD__ );
  72
  73                 if ( $this->context->request->getVal( 'printable' ) === 'yes' ) {
  74                         $this->context->output->setPrintable();
  75                 }
  76
  77                 wfRunHooks( 'BeforeInitialize', array(
  78                         &$this->context->title,
  79                         &$article,
  80                         &$this->context->output,
  81                         &$this->context->user,
  82                         $this->context->request,
  83                         $this
  84                 ) );
  85
  86                 // If the user is not logged in, the Namespace:title of the article must be in
  87                 // the Read array in order for the user to see it. (We have to check here to
  88                 // catch special pages etc. We check again in Article::view())
  89                 if ( !is_null( $this->context->title ) && !$this->context->title->userCanRead() ) {
  90                         $this->context->output->loginToUse();
  91                         $this->finalCleanup();
  92                         $this->context->output->disable();
  93                         wfProfileOut( __METHOD__ );
  94                         return false;
  95                 }
  96
  97                 // Call handleSpecialCases() to deal with all special requests...
  98                 if ( !$this->handleSpecialCases() ) {
  99                         // ...otherwise treat it as an article view. The article
 100                         // may be a redirect to another article or URL.
 101                         $new_article = $this->initializeArticle();
 102                         if ( is_object( $new_article ) ) {
 103                                 $article = $new_article;
 104                                 $this->performAction( $article );
 105                         } elseif ( is_string( $new_article ) ) {
 106                                 $this->context->output->redirect( $new_article );
 107                         } else {
 108                                 wfProfileOut( __METHOD__ );
 109                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
 110                         }
 111                 }
 112                 wfProfileOut( __METHOD__ );
 113         }
 114
 115         /**
 116          * Parse $request to get the Title object
 117          *
 118          * @return Title object to be $wgTitle
 119          */
 120         private function parseTitle() {
 121                 global $wgContLang;
 122
 123                 $curid = $this->context->request->getInt( 'curid' );
 124                 $title = $this->context->request->getVal( 'title' );
 125
 126                 if ( $this->context->request->getCheck( 'search' ) ) {
 127                         // Compatibility with old search URLs which didn't use Special:Search
 128                         // Just check for presence here, so blank requests still
 129                         // show the search page when using ugly URLs (bug 8054).
 130                         $ret = SpecialPage::getTitleFor( 'Search' );
 131                 } elseif ( $curid ) {
 132                         // URLs like this are generated by RC, because rc_title isn't always accurate
 133                         $ret = Title::newFromID( $curid );
 134                 } elseif ( $title == '' && $this->getAction() != 'delete' ) {
 135                         $ret = Title::newMainPage();
 136                 } else {
 137                         $ret = Title::newFromURL( $title );
 138                         // check variant links so that interwiki links don't have to worry
 139                         // about the possible different language variants
 140                         if ( count( $wgContLang->getVariants() ) > 1 && !is_null( $ret ) && $ret->getArticleID() == 0 ){
 141                                 $wgContLang->findVariantLink( $title, $ret );
 142                         }
 143                 }
 144                 // For non-special titles, check for implicit titles
 145                 if ( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) {
 146                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 147                         $oldid = $this->context->request->getInt( 'oldid' );
 148                         $oldid = $oldid ? $oldid : $this->context->request->getInt( 'diff' );
 149                         // Allow oldid to override a changed or missing title
 150                         if ( $oldid ) {
 151                                 $rev = Revision::newFromId( $oldid );
 152                                 $ret = $rev ? $rev->getTitle() : $ret;
 153                         }
 154                 }
 155
 156                 if( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ){
 157                         $ret = new BadTitle;
 158                 }
 159                 return $ret;
 160         }
 161
 162         /**
 163          * Get the Title object that we'll be acting on, as specified in the WebRequest
 164          * @return Title
 165          */
 166         public function getTitle(){
 167                 if( $this->context->title === null ){
 168                         $this->context->title = $this->parseTitle();
 169                 }
 170                 return $this->context->title;
 171         }
 172
 173         /**
 174          * Initialize some special cases:
 175          * - bad titles
 176          * - local interwiki redirects
 177          * - redirect loop
 178          * - special pages
 179          *
 180          * @return bool true if the request is already executed
 181          */
 182         private function handleSpecialCases() {
 183                 wfProfileIn( __METHOD__ );
 184
 185                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 186                 if ( $this->context->title instanceof BadTitle ) {
 187                         // Die now before we mess up $wgArticle and the skin stops working
 188                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 189
 190                 // Interwiki redirects
 191                 } else if ( $this->context->title->getInterwiki() != '' ) {
 192                         $rdfrom = $this->context->request->getVal( 'rdfrom' );
 193                         if ( $rdfrom ) {
 194                                 $url = $this->context->title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 195                         } else {
 196                                 $query = $this->context->request->getValues();
 197                                 unset( $query['title'] );
 198                                 $url = $this->context->title->getFullURL( $query );
 199                         }
 200                         // Check for a redirect loop
 201                         if ( !preg_match( '/^' . preg_quote( $this->getVal( 'Server' ), '/' ) . '/', $url ) && $this->context->title->isLocal() ) {
 202                                 // 301 so google et al report the target as the actual url.
 203                                 $this->context->output->redirect( $url, 301 );
 204                         } else {
 205                                 $this->context->title = new BadTitle;
 206                                 wfProfileOut( __METHOD__ );
 207                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 208                         }
 209                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 210                 } else if ( $this->context->request->getVal( 'action', 'view' ) == 'view' && !$this->context->request->wasPosted()
 211                         && ( $this->context->request->getVal( 'title' ) === null || $this->context->title->getPrefixedDBKey() != $this->context->request->getVal( 'title' ) )
 212                         && !count( array_diff( array_keys( $this->context->request->getValues() ), array( 'action', 'title' ) ) ) )
 213                 {
 214                         if ( $this->context->title->getNamespace() == NS_SPECIAL ) {
 215                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $this->context->title->getDBkey() );
 216                                 if ( $name ) {
 217                                         $this->context->title = SpecialPage::getTitleFor( $name, $subpage );
 218                                 }
 219                         }
 220                         $targetUrl = $this->context->title->getFullURL();
 221                         // Redirect to canonical url, make it a 301 to allow caching
 222                         if ( $targetUrl == $this->context->request->getFullRequestURL() ) {
 223                                 $message = "Redirect loop detected!\n\n" .
 224                                         "This means the wiki got confused about what page was " .
 225                                         "requested; this sometimes happens when moving a wiki " .
 226                                         "to a new server or changing the server configuration.\n\n";
 227
 228                                 if ( $this->getVal( 'UsePathInfo' ) ) {
 229                                         $message .= "The wiki is trying to interpret the page " .
 230                                                 "title from the URL path portion (PATH_INFO), which " .
 231                                                 "sometimes fails depending on the web server. Try " .
 232                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 233                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 234                                                 "is correct.";
 235                                 } else {
 236                                         $message .= "Your web server was detected as possibly not " .
 237                                                 "supporting URL path components (PATH_INFO) correctly; " .
 238                                                 "check your LocalSettings.php for a customized " .
 239                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 240                                                 "to true.";
 241                                 }
 242                                 wfHttpError( 500, "Internal error", $message );
 243                                 wfProfileOut( __METHOD__ );
 244                                 return false;
 245                         } else {
 246                                 $this->context->output->setSquidMaxage( 1200 );
 247                                 $this->context->output->redirect( $targetUrl, '301' );
 248                         }
 249                 // Special pages
 250                 } else if ( NS_SPECIAL == $this->context->title->getNamespace() ) {
 251                         // actions that need to be made when we have a special pages
 252                         SpecialPageFactory::executePath( $this->context->title, $this->context );
 253                 } else {
 254                         // No match to special cases
 255                         wfProfileOut( __METHOD__ );
 256                         return false;
 257                 }
 258                 // Did match a special case
 259                 wfProfileOut( __METHOD__ );
 260                 return true;
 261         }
 262
 263         /**
 264          * Create an Article object of the appropriate class for the given page.
 265          *
 266          * @param $title Title
 267          * @param $context RequestContext
 268          * @return Article object
 269          */
 270         public static function articleFromTitle( $title, RequestContext $context ) {
 271                 if ( NS_MEDIA == $title->getNamespace() ) {
 272                         // FIXME: where should this go?
 273                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 274                 }
 275
 276                 $article = null;
 277                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 278                 if ( $article ) {
 279                         return $article;
 280                 }
 281
 282                 switch( $title->getNamespace() ) {
 283                         case NS_FILE:
 284                                 $page = new ImagePage( $title );
 285                                 break;
 286                         case NS_CATEGORY:
 287                                 $page = new CategoryPage( $title );
 288                                 break;
 289                         default:
 290                                 $page = new Article( $title );
 291                 }
 292                 $page->setContext( $context );
 293                 return $page;
 294         }
 295
 296         /**
 297          * Returns the action that will be executed, not necesserly the one passed
 298          * passed through the "action" parameter. Actions disabled in
 299          * $wgDisabledActions will be replaced by "nosuchaction"
 300          *
 301          * @return String: action
 302          */
 303         public function getAction() {
 304                 global $wgDisabledActions;
 305
 306                 $action = $this->context->request->getVal( 'action', 'view' );
 307
 308                 // Check for disabled actions
 309                 if ( in_array( $action, $wgDisabledActions ) ) {
 310                         return 'nosuchaction';
 311                 }
 312
 313                 // Workaround for bug #20966: inability of IE to provide an action dependent
 314                 // on which submit button is clicked.
 315                 if ( $action === 'historysubmit' ) {
 316                         if ( $this->context->request->getBool( 'revisiondelete' ) ) {
 317                                 return 'revisiondelete';
 318                         } else {
 319                                 return 'view';
 320                         }
 321                 } elseif ( $action == 'editredlink' ) {
 322                         return 'edit';
 323                 }
 324
 325                 return $action;
 326         }
 327
 328         /**
 329          * Initialize the object to be known as $wgArticle for "standard" actions
 330          * Create an Article object for the page, following redirects if needed.
 331          *
 332          * @return mixed an Article, or a string to redirect to another URL
 333          */
 334         private function initializeArticle() {
 335                 wfProfileIn( __METHOD__ );
 336
 337                 $action = $this->context->request->getVal( 'action', 'view' );
 338                 $article = self::articleFromTitle( $this->context->title, $this->context );
 339                 // NS_MEDIAWIKI has no redirects.
 340                 // It is also used for CSS/JS, so performance matters here...
 341                 if ( $this->context->title->getNamespace() == NS_MEDIAWIKI ) {
 342                         wfProfileOut( __METHOD__ );
 343                         return $article;
 344                 }
 345                 // Namespace might change when using redirects
 346                 // Check for redirects ...
 347                 $file = ( $this->context->title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 348                 if ( ( $action == 'view' || $action == 'render' )       // ... for actions that show content
 349                         && !$this->context->request->getVal( 'oldid' ) &&    // ... and are not old revisions
 350                         !$this->context->request->getVal( 'diff' ) &&    // ... and not when showing diff
 351                         $this->context->request->getVal( 'redirect' ) != 'no' &&        // ... unless explicitly told not to
 352                         // ... and the article is not a non-redirect image page with associated file
 353                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 354                 {
 355                         // Give extensions a change to ignore/handle redirects as needed
 356                         $ignoreRedirect = $target = false;
 357
 358                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 359                                 array( &$this->context->title, &$this->context->request, &$ignoreRedirect, &$target, &$article ) );
 360
 361                         // Follow redirects only for... redirects.
 362                         // If $target is set, then a hook wanted to redirect.
 363                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 364                                 // Is the target already set by an extension?
 365                                 $target = $target ? $target : $article->followRedirect();
 366                                 if ( is_string( $target ) ) {
 367                                         if ( !$this->getVal( 'DisableHardRedirects' ) ) {
 368                                                 // we'll need to redirect
 369                                                 wfProfileOut( __METHOD__ );
 370                                                 return $target;
 371                                         }
 372                                 }
 373                                 if ( is_object( $target ) ) {
 374                                         // Rewrite environment to redirected article
 375                                         $rarticle = self::articleFromTitle( $target, $this->context );
 376                                         $rarticle->loadPageData();
 377                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 378                                                 $rarticle->setRedirectedFrom( $this->context->title );
 379                                                 $article = $rarticle;
 380                                                 $this->context->title = $target;
 381                                         }
 382                                 }
 383                         } else {
 384                                 $this->context->title = $article->getTitle();
 385                         }
 386                 }
 387                 wfProfileOut( __METHOD__ );
 388                 return $article;
 389         }
 390
 391         /**
 392          * Cleaning up request by doing deferred updates, DB transaction, and the output
 393          */
 394         public function finalCleanup() {
 395                 wfProfileIn( __METHOD__ );
 396                 // Now commit any transactions, so that unreported errors after
 397                 // output() don't roll back the whole DB transaction
 398                 $factory = wfGetLBFactory();
 399                 $factory->commitMasterChanges();
 400                 // Output everything!
 401                 $this->context->output->output();
 402                 // Do any deferred jobs
 403                 wfDoUpdates( 'commit' );
 404                 // Close the session so that jobs don't access the current session
 405                 session_write_close();
 406                 $this->doJobs();
 407                 wfProfileOut( __METHOD__ );
 408         }
 409
 410         /**
 411          * Do a job from the job queue
 412          */
 413         private function doJobs() {
 414                 global $wgJobRunRate;
 415
 416                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 417                         return;
 418                 }
 419                 if ( $wgJobRunRate < 1 ) {
 420                         $max = mt_getrandmax();
 421                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 422                                 return;
 423                         }
 424                         $n = 1;
 425                 } else {
 426                         $n = intval( $wgJobRunRate );
 427                 }
 428
 429                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 430                         $output = $job->toString() . "\n";
 431                         $t = -wfTime();
 432                         $success = $job->run();
 433                         $t += wfTime();
 434                         $t = round( $t * 1000 );
 435                         if ( !$success ) {
 436                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 437                         } else {
 438                                 $output .= "Success, Time: $t ms\n";
 439                         }
 440                         wfDebugLog( 'jobqueue', $output );
 441                 }
 442         }
 443
 444         /**
 445          * Ends this task peacefully
 446          */
 447         public function restInPeace() {
 448                 MessageCache::logMessages();
 449                 wfLogProfilingData();
 450                 // Commit and close up!
 451                 $factory = wfGetLBFactory();
 452                 $factory->commitMasterChanges();
 453                 $factory->shutdown();
 454                 wfDebug( "Request ended normally\n" );
 455         }
 456
 457         /**
 458          * Perform one of the "standard" actions
 459          *
 460          * @param $article Article
 461          */
 462         private function performAction( $article ) {
 463                 wfProfileIn( __METHOD__ );
 464
 465                 if ( !wfRunHooks( 'MediaWikiPerformAction', array(
 466                                 $this->context->output, $article, $this->context->title,
 467                                 $this->context->user, $this->context->request, $this ) ) )
 468                 {
 469                         wfProfileOut( __METHOD__ );
 470                         return;
 471                 }
 472
 473                 $act = $this->getAction();
 474
 475                 $action = Action::factory( $this->getAction(), $article );
 476                 if( $action instanceof Action ){
 477                         $action->show();
 478                         wfProfileOut( __METHOD__ );
 479                         return;
 480                 }
 481
 482                 switch( $act ) {
 483                         case 'view':
 484                                 $this->context->output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 485                                 $article->view();
 486                                 break;
 487                         case 'raw': // includes JS/CSS
 488                                 wfProfileIn( __METHOD__ . '-raw' );
 489                                 $raw = new RawPage( $article );
 490                                 $raw->view();
 491                                 wfProfileOut( __METHOD__ . '-raw' );
 492                                 break;
 493                         case 'delete':
 494                         case 'revert':
 495                         case 'rollback':
 496                         case 'protect':
 497                         case 'unprotect':
 498                         case 'info':
 499                         case 'markpatrolled':
 500                         case 'render':
 501                         case 'deletetrackback':
 502                                 $article->$act();
 503                                 break;
 504                         case 'dublincore':
 505                                 if ( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 506                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 507                                 } else {
 508                                         $rdf = new DublinCoreRdf( $article );
 509                                         $rdf->show();
 510                                 }
 511                                 break;
 512                         case 'creativecommons':
 513                                 if ( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 514                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 515                                 } else {
 516                                         $rdf = new CreativeCommonsRdf( $article );
 517                                         $rdf->show();
 518                                 }
 519                                 break;
 520                         case 'submit':
 521                                 if ( session_id() == '' ) {
 522                                         // Send a cookie so anons get talk message notifications
 523                                         wfSetupSession();
 524                                 }
 525                                 // Continue...
 526                         case 'edit':
 527                                 if ( wfRunHooks( 'CustomEditor', array( $article, $this->context->user ) ) ) {
 528                                         $internal = $this->context->request->getVal( 'internaledit' );
 529                                         $external = $this->context->request->getVal( 'externaledit' );
 530                                         $section = $this->context->request->getVal( 'section' );
 531                                         $oldid = $this->context->request->getVal( 'oldid' );
 532                                         if ( !$this->getVal( 'UseExternalEditor' ) || $act == 'submit' || $internal ||
 533                                            $section || $oldid || ( !$this->context->user->getOption( 'externaleditor' ) && !$external ) ) {
 534                                                 $editor = new EditPage( $article );
 535                                                 $editor->submit();
 536                                         } elseif ( $this->getVal( 'UseExternalEditor' ) && ( $external || $this->context->user->getOption( 'externaleditor' ) ) ) {
 537                                                 $mode = $this->context->request->getVal( 'mode' );
 538                                                 $extedit = new ExternalEdit( $article, $mode );
 539                                                 $extedit->edit();
 540                                         }
 541                                 }
 542                                 break;
 543                         case 'history':
 544                                 if ( $this->context->request->getFullRequestURL() == $this->context->title->getInternalURL( 'action=history' ) ) {
 545                                         $this->context->output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 546                                 }
 547                                 $history = new HistoryPage( $article );
 548                                 $history->history();
 549                                 break;
 550                         case 'revisiondelete':
 551                                 // For show/hide submission from history page
 552                                 $special = SpecialPageFactory::getPage( 'Revisiondelete' );
 553                                 $special->execute( '' );
 554                                 break;
 555                         default:
 556                                 if ( wfRunHooks( 'UnknownAction', array( $act, $article ) ) ) {
 557                                         $this->context->output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 558                                 }
 559                 }
 560                 wfProfileOut( __METHOD__ );
 561         }
 562 }