grpc/lib/src/shared/security.dart

// Copyright (c) 2017, the gRPC project authors. Please see the AUTHORS file
// for details. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:io';

const supportedAlpnProtocols = const ['grpc-exp', 'h2'];

// TODO: Simplify once we have a stable Dart 1.25 release (update pubspec to
// require SDK >=1.25.0, and remove check for alpnSupported).
SecurityContext createSecurityContext(bool isServer) =>
    SecurityContext.alpnSupported
        ? (new SecurityContext()
          ..setAlpnProtocols(supportedAlpnProtocols, isServer))
        : new SecurityContext();