handleRequest.js

import { extname, join } from 'path';
import { parse } from 'url';
import { stat, Promise } from 'sander';
import serveFile from './serveFile';
import serveDir from './serveDir';
import serveSourcemap from './serveSourcemap';
import serveError from './serveError';

export default function handleRequest ( node, srcDir, error, sourcemapPromises, request, response ) {
	const parsedUrl = parse( request.url );
	const pathname = parsedUrl.pathname;

	let filepath;

	if ( error ) {
		if ( pathname.substr( 0, 11 ) === '/__gobble__' ) {
			const message = ( error.original && error.original.message ) || error.message || '';
			filepath = pathname.substring( 11 );

			// only allow links to files that we're actually interested in, not
			// the whole damn filesystem
			if ( ~message.indexOf( filepath ) || ~error.stack.indexOf( filepath ) ) {
				return serveFile( pathname.substring( 11 ), request, response );
			}
		}

		serveError( error, request, response );
		return Promise.resolve();
	}

	filepath = join( srcDir, pathname );

	if ( extname( filepath ) === '.map' ) {
		return serveSourcemap( node, filepath, sourcemapPromises, request, response )
			.catch( err => serveError( err, request, response ) );
	}

	return stat( filepath ).then( stats => {
		if ( stats.isDirectory() ) {
			// might need to redirect from `foo` to `foo/`
			if ( pathname.slice( -1 ) !== '/' ) {
				response.setHeader( 'Location', pathname + '/' + ( parsedUrl.search || '' ) );
				response.writeHead( 301 );

				response.end();
			} else {
				return serveDir( filepath, request, response );
			}
		}

		else {
			return serveFile( filepath, request, response );
		}
	}, err => serveError( err, request, response ) );
}