blob: 460885fa9559464b160bb11b900f8455447528af [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:async';
import 'dart:isolate';
import 'package:path/path.dart' as p;
import 'package:shelf/shelf.dart';
import 'package:shelf_static/shelf_static.dart';
/// A shelf handler that serves a virtual packages directory based on a package
/// config.
class PackageConfigHandler {
/// The static handlers for serving entries in the package config, indexed by
/// name.
final _packageHandlers = <String, Future<Handler>>{};
/// Optional, a map of package names to base uri for resolving `package:`
/// uris for that package.
final Map<String, Uri>? _packageMap;
PackageConfigHandler({Map<String, Uri>? packageMap})
: _packageMap = packageMap;
/// The callback for handling a single request.
Future<Response> handleRequest(Request request) async {
final segments = request.url.pathSegments;
final handler = await _handlerFor(segments.first);
return handler(request.change(path: segments.first));
/// Creates a handler for [packageName] based on the package map in
/// [_packageMap] or the current isolate resolver.
Future<Handler> _handlerFor(String packageName) =>
_packageHandlers.putIfAbsent(packageName, () async {
Uri? packageUri;
if (_packageMap != null) {
packageUri = _packageMap![packageName];
} else {
final fakeResolvedUri = await Isolate.resolvePackageUri(
Uri(scheme: 'package', path: '$packageName/'));
packageUri = fakeResolvedUri;
final handler = packageUri == null
? (_) => Response.notFound('Package $packageName not found.')
: createStaticHandler(p.fromUri(packageUri),
serveFilesOutsidePath: true);
return handler;