RawAction.php

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<?php
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MainConfigNames;
use MediaWiki\Permissions\PermissionManager;
use MediaWiki\Permissions\RestrictionStore;
use MediaWiki\Revision\RevisionLookup;
use MediaWiki\Revision\SlotRecord;
 
class RawAction extends FormlessAction {
 
    private $parser;
 
    private $permissionManager;
 
    private $revisionLookup;
 
    private $restrictionStore;
 
    public function __construct(
        Article $article,
        IContextSource $context,
        Parser $parser,
        PermissionManager $permissionManager,
        RevisionLookup $revisionLookup,
        RestrictionStore $restrictionStore
    ) {
        parent::__construct( $article, $context );
        $this->parser = $parser;
        $this->permissionManager = $permissionManager;
        $this->revisionLookup = $revisionLookup;
        $this->restrictionStore = $restrictionStore;
    }
 
    public function getName() {
        return 'raw';
    }
 
    public function requiresWrite() {
        return false;
    }
 
    public function requiresUnblock() {
        return false;
    }
 
    public function onView() {
        $this->getOutput()->disable();
        $request = $this->getRequest();
        $response = $request->response();
        $config = $this->context->getConfig();
 
        if ( $this->getOutput()->checkLastModified(
            $this->getWikiPage()->getTouched()
        ) ) {
            return null; // Client cache fresh and headers sent, nothing more to do.
        }
 
        $contentType = $this->getContentType();
 
        $maxage = $request->getInt( 'maxage', $config->get( MainConfigNames::CdnMaxAge ) );
        $smaxage = $request->getIntOrNull( 'smaxage' );
        if ( $smaxage === null ) {
            if (
                $contentType == 'text/css' ||
                $contentType == 'application/json' ||
                $contentType == 'text/javascript'
            ) {
                // CSS/JSON/JS raw content has its own CDN max age configuration.
                // Note: HtmlCacheUpdater::getUrls() includes action=raw for css/json/js
                // pages, so if using the canonical url, this will get HTCP purges.
                $smaxage = intval( $config->get( MainConfigNames::ForcedRawSMaxage ) );
            } else {
                // No CDN cache for anything else
                $smaxage = 0;
            }
        }
 
        // Set standard Vary headers so cache varies on cookies and such (T125283)
        $response->header( $this->getOutput()->getVaryHeader() );
 
        // Output may contain user-specific data;
        // vary generated content for open sessions on private wikis
        $privateCache = !$this->permissionManager->isEveryoneAllowed( 'read' ) &&
            ( $smaxage == 0 || MediaWiki\Session\SessionManager::getGlobalSession()->isPersistent() );
        // Don't accidentally cache cookies if user is registered (T55032)
        $privateCache = $privateCache || $this->getUser()->isRegistered();
        $mode = $privateCache ? 'private' : 'public';
        $response->header(
            'Cache-Control: ' . $mode . ', s-maxage=' . $smaxage . ', max-age=' . $maxage
        );
 
        // In the event of user JS, don't allow loading a user JS/CSS/Json
        // subpage that has no registered user associated with, as
        // someone could register the account and take control of the
        // JS/CSS/Json page.
        $title = $this->getTitle();
        if ( $title->isUserConfigPage() && $contentType !== 'text/x-wiki' ) {
            // not using getRootText() as we want this to work
            // even if subpages are disabled.
            $rootPage = strtok( $title->getText(), '/' );
            $userFromTitle = User::newFromName( $rootPage, 'usable' );
            if ( !$userFromTitle || !$userFromTitle->isRegistered() ) {
                $elevated = $this->getAuthority()->isAllowed( 'editinterface' );
                $elevatedText = $elevated ? 'by elevated ' : '';
                $log = LoggerFactory::getInstance( "security" );
                $log->warning(
                    "Unsafe JS/CSS/Json {$elevatedText}load - {user} loaded {title} with {ctype}",
                    [
                        'user' => $this->getUser()->getName(),
                        'title' => $title->getPrefixedDBkey(),
                        'ctype' => $contentType,
                        'elevated' => $elevated
                    ]
                );
                throw new HttpError( 403, wfMessage( 'unregistered-user-config' ) );
            }
        }
 
        // Don't allow loading non-protected pages as javascript.
        // In future we may further restrict this to only CONTENT_MODEL_JAVASCRIPT
        // in NS_MEDIAWIKI or NS_USER, as well as including other config types,
        // but for now be more permissive. Allowing protected pages outside of
        // NS_USER and NS_MEDIAWIKI in particular should be considered a temporary
        // allowance.
        $pageRestrictions = $this->restrictionStore->getRestrictions( $title, 'edit' );
        if (
            $contentType === 'text/javascript' &&
            !$title->isUserJsConfigPage() &&
            !$title->inNamespace( NS_MEDIAWIKI ) &&
            !in_array( 'sysop', $pageRestrictions ) &&
            !in_array( 'editprotected', $pageRestrictions )
        ) {
 
            $log = LoggerFactory::getInstance( "security" );
            $log->info( "Blocked loading unprotected JS {title} for {user}",
                [
                    'user' => $this->getUser()->getName(),
                    'title' => $title->getPrefixedDBkey(),
                ]
            );
            throw new HttpError( 403, wfMessage( 'unprotected-js' ) );
        }
 
        $response->header( 'Content-type: ' . $contentType . '; charset=UTF-8' );
 
        $text = $this->getRawText();
 
        // Don't return a 404 response for CSS or JavaScript;
        // 404s aren't generally cached and it would create
        // extra hits when user CSS/JS are on and the user doesn't
        // have the pages.
        if ( $text === false && $contentType == 'text/x-wiki' ) {
            $response->statusHeader( 404 );
        }
 
        if ( !$this->getHookRunner()->onRawPageViewBeforeOutput( $this, $text ) ) {
            wfDebug( __METHOD__ . ": RawPageViewBeforeOutput hook broke raw page output." );
        }
 
        echo $text;
 
        return null;
    }
 
    public function getRawText() {
        $text = false;
        $title = $this->getTitle();
        $request = $this->getRequest();
 
        // Get it from the DB
        $rev = $this->revisionLookup->getRevisionByTitle( $title, $this->getOldId() );
        if ( $rev ) {
            $lastmod = wfTimestamp( TS_RFC2822, $rev->getTimestamp() );
            $request->response()->header( "Last-modified: $lastmod" );
 
            // Public-only due to cache headers
            // Fetch specific slot if defined
            $slot = $this->getRequest()->getText( 'slot' );
            if ( $slot ) {
                if ( $rev->hasSlot( $slot ) ) {
                    $content = $rev->getContent( $slot );
                } else {
                    $content = null;
                }
            } else {
                $content = $rev->getContent( SlotRecord::MAIN );
            }
 
            if ( $content === null ) {
                // revision or slot not found (or suppressed)
            } elseif ( !$content instanceof TextContent ) {
                // non-text content
                wfHttpError( 415, "Unsupported Media Type", "The requested page uses the content model `"
                    . $content->getModel() . "` which is not supported via this interface." );
                die();
            } else {
                // want a section?
                $section = $request->getIntOrNull( 'section' );
                if ( $section !== null ) {
                    $content = $content->getSection( $section );
                }
 
                if ( $content === null || $content === false ) {
                    // section not found (or section not supported, e.g. for JS, JSON, and CSS)
                } else {
                    $text = $content->getText();
                }
            }
        }
 
        if ( $text !== false && $text !== '' && $request->getRawVal( 'templates' ) === 'expand' ) {
            $text = $this->parser->preprocess(
                $text,
                $title,
                ParserOptions::newFromContext( $this->getContext() )
            );
        }
 
        return $text;
    }
 
    public function getOldId() {
        $oldid = $this->getRequest()->getInt( 'oldid' );
        $rl = $this->revisionLookup;
        switch ( $this->getRequest()->getText( 'direction' ) ) {
            case 'next':
                # output next revision, or nothing if there isn't one
                $nextRev = null;
                if ( $oldid ) {
                    $oldRev = $rl->getRevisionById( $oldid );
                    if ( $oldRev ) {
                        $nextRev = $rl->getNextRevision( $oldRev );
                    }
                }
                $oldid = $nextRev ? $nextRev->getId() : -1;
                break;
            case 'prev':
                # output previous revision, or nothing if there isn't one
                $prevRev = null;
                if ( !$oldid ) {
                    # get the current revision so we can get the penultimate one
                    $oldid = $this->getWikiPage()->getLatest();
                }
                $oldRev = $rl->getRevisionById( $oldid );
                if ( $oldRev ) {
                    $prevRev = $rl->getPreviousRevision( $oldRev );
                }
                $oldid = $prevRev ? $prevRev->getId() : -1;
                break;
            case 'cur':
                $oldid = 0;
                break;
        }
 
        // @phan-suppress-next-line PhanTypeMismatchReturnNullable RevisionRecord::getId does not return null here
        return $oldid;
    }
 
    public function getContentType() {
        // Optimisation: Avoid slow getVal(), this isn't user-generated content.
        $ctype = $this->getRequest()->getRawVal( 'ctype' );
 
        if ( $ctype == '' ) {
            // Legacy compatibility
            $gen = $this->getRequest()->getRawVal( 'gen' );
            if ( $gen == 'js' ) {
                $ctype = 'text/javascript';
            } elseif ( $gen == 'css' ) {
                $ctype = 'text/css';
            }
        }
 
        $allowedCTypes = [
            'text/x-wiki',
            'text/javascript',
            'text/css',
            // FIXME: Should we still allow Zope editing? External editing feature was dropped
            'application/x-zope-edit',
            'application/json'
        ];
        if ( $ctype == '' || !in_array( $ctype, $allowedCTypes ) ) {
            $ctype = 'text/x-wiki';
        }
 
        return $ctype;
    }
}