img_auth.php

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<?php
define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
if ( isset( $_SERVER['MW_COMPILED'] ) ) {
        require ( 'core/includes/WebStart.php' );
} else {
        require ( __DIR__ . '/includes/WebStart.php' );
}
wfProfileIn( 'img_auth.php' );

# Set action base paths so that WebRequest::getPathInfo()
# recognizes the "X" as the 'title' in ../image_auth/X urls.
$wgArticlePath = false; # Don't let a "/*" article path clober our action path
$wgActionPaths = array( "$wgUploadPath/" );

wfImageAuthMain();
wfLogProfilingData();

function wfImageAuthMain() {
        global $wgImgAuthPublicTest, $wgRequest;

        // See if this is a public Wiki (no protections).
        if ( $wgImgAuthPublicTest
                && in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) )
        {
                // This is a public wiki, so disable this script (for private wikis only)
                wfForbidden( 'img-auth-accessdenied', 'img-auth-public' );
                return;
        }

        // Get the requested file path (source file or thumbnail)
        $matches = WebRequest::getPathInfo();
        if ( !isset( $matches['title'] ) ) {
                wfForbidden( 'img-auth-accessdenied', 'img-auth-nopathinfo' );
                return;
        }
        $path = $matches['title'];
        if ( $path && $path[0] !== '/' ) {
                // Make sure $path has a leading /
                $path = "/" . $path;
        }

        // Check for bug 28235: QUERY_STRING overriding the correct extension
        $whitelist = array();
        $dotPos = strrpos( $path, '.' );
        if ( $dotPos !== false ) {
                $whitelist[] = substr( $path, $dotPos + 1 );
        }
        if ( !$wgRequest->checkUrlExtension( $whitelist ) ) {
                return;
        }

        // Get the local file repository
        $repo = RepoGroup::singleton()->getRepo( 'local' );

        // Get the full file storage path and extract the source file name.
        // (e.g. 120px-Foo.png => Foo.png or page2-120px-Foo.png => Foo.png).
        // This only applies to thumbnails, and all thumbnails should
        // be under a folder that has the source file name.
        if ( strpos( $path, '/thumb/' ) === 0 ) {
                $name = wfBaseName( dirname( $path ) ); // file is a thumbnail
                $filename = $repo->getZonePath( 'thumb' ) . substr( $path, 6 ); // strip "/thumb"
        } else {
                $name = wfBaseName( $path ); // file is a source file
                $filename = $repo->getZonePath( 'public' ) . $path;
        }

        // Check to see if the file exists
        if ( !$repo->fileExists( $filename ) ) {
                wfForbidden( 'img-auth-accessdenied','img-auth-nofile', $filename );
                return;
        }

        $title = Title::makeTitleSafe( NS_FILE, $name );
        if ( !$title instanceof Title ) { // files have valid titles
                wfForbidden( 'img-auth-accessdenied', 'img-auth-badtitle', $name );
                return;
        }

        // Run hook for extension authorization plugins
        if ( !wfRunHooks( 'ImgAuthBeforeStream', array( &$title, &$path, &$name, &$result ) ) ) {
                wfForbidden( $result[0], $result[1], array_slice( $result, 2 ) );
                return;
        }

        // Check user authorization for this title
        // Checks Whitelist too
        if ( !$title->userCan( 'read' ) ) {
                wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $name );
                return;
        }

        // Stream the requested file
        wfDebugLog( 'img_auth', "Streaming `".$filename."`." );
        $repo->streamFile( $filename, array( 'Cache-Control: private', 'Vary: Cookie' ) );
}

function wfForbidden( $msg1, $msg2 ) {
        global $wgImgAuthDetails;

        $args = func_get_args();
        array_shift( $args );
        array_shift( $args );

        $msgHdr = wfMessage( $msg1 )->escaped();
        $detailMsgKey = $wgImgAuthDetails ? $msg2 : 'badaccess-group0';
        $detailMsg = wfMessage( $detailMsgKey, $args )->escaped();

        wfDebugLog( 'img_auth',
                "wfForbidden Hdr:" . wfMessage( $msg1 )->inLanguage( 'en' )->text() . " Msg: ".
                wfMessage( $msg2, $args )->inLanguage( 'en' )->text()
        );

        header( 'HTTP/1.0 403 Forbidden' );
        header( 'Cache-Control: no-cache' );
        header( 'Content-Type: text/html; charset=utf-8' );
        echo <<<ENDS
<html>
<body>
<h1>$msgHdr</h1>
<p>$detailMsg</p>
</body>
</html>
ENDS;
}