// Copyright (c) 2017, 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.

/// @assertion void findProxy=(
///  String f(
///  Uri url
///  )
///  )
/// Sets the function used to resolve the proxy server to be used for opening a
/// HTTP connection to the specified url. If this function is not set, direct
/// connections will always be used.
///
/// The string returned by f must be in the format used by browser PAC (proxy
/// auto-config) scripts. That is either
///
/// "DIRECT"
/// for using a direct connection or
///
/// "PROXY host:port"
/// for using the proxy server host on port port.
///
/// A configuration can contain several configuration elements separated by
/// semicolons, e.g.
///
/// "PROXY host:port; PROXY host2:port2; DIRECT"
/// The static function findProxyFromEnvironment on this class can be used to
/// implement proxy server resolving based on environment variables.
/// @description Checks that if this function is not set, direct connections are
/// used.
/// @author sgrekhov@unipro.ru
/// @issue 42870

import "dart:io";
import 'dart:async';
import "dart:convert";
import "../../../Utils/expect.dart";

test() async {
  int requestCounter = 0;

  HttpServer server = await HttpServer.bind(InternetAddress.loopbackIPv4, 0);
  server.listen((HttpRequest request) {
    Expect.isNull(request.headers[HttpHeaders.proxyAuthorizationHeader]);
    if (requestCounter++ == 0) {
      request.response.statusCode = HttpStatus.unauthorized;
      request.response.headers
          .set(HttpHeaders.proxyAuthenticateHeader, 'Basic, realm=realm');
      request.response.statusCode = HttpStatus.proxyAuthenticationRequired;
      request.response.close();
    } else  {
      request.response.close();
      server.close();
      asyncEnd();
    }
  });
  HttpClient client = new HttpClient();

  client.authenticateProxy =
      (String host, int port, String scheme, String? realm) {
    Completer<bool> completer = new Completer<bool>();
    completer.complete(true);
    return completer.future;
  };

  client
      .getUrl(Uri.parse(
          "http://${InternetAddress.loopbackIPv4.address}:${server.port}"))
      .then((HttpClientRequest request) => request.close())
      .then((HttpClientResponse response) {
    response.cast<List<int>>().transform(utf8.decoder).listen((content) {});
  });
}

main() {
  asyncStart();
  test();
}