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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// 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.
#endregion
using System;
using System.Threading;
using System.Threading.Tasks;
using Google.Apis.Auth.OAuth2;
using Grpc.Core;
using Grpc.Core.Utils;
namespace Grpc.Auth
{
/// <summary>
/// Factory methods to create authorization interceptors for Google credentials.
/// <seealso cref="GoogleGrpcCredentials"/>
/// </summary>
public static class GoogleAuthInterceptors
{
private const string AuthorizationHeader = "Authorization";
private const string Schema = "Bearer";
/// <summary>
/// Creates an <see cref="AsyncAuthInterceptor"/> that will obtain access token from any credential type that implements
/// <c>ITokenAccess</c>. (e.g. <c>GoogleCredential</c>).
/// </summary>
/// <param name="credential">The credential to use to obtain access tokens.</param>
/// <returns>The interceptor.</returns>
public static AsyncAuthInterceptor FromCredential(ITokenAccess credential)
{
return new AsyncAuthInterceptor(async (context, metadata) =>
{
var accessToken = await credential.GetAccessTokenForRequestAsync(context.ServiceUrl, CancellationToken.None).ConfigureAwait(false);
metadata.Add(CreateBearerTokenHeader(accessToken));
});
}
/// <summary>
/// Creates an <see cref="AsyncAuthInterceptor"/> that will use given access token as authorization.
/// </summary>
/// <param name="accessToken">OAuth2 access token.</param>
/// <returns>The interceptor.</returns>
public static AsyncAuthInterceptor FromAccessToken(string accessToken)
{
GrpcPreconditions.CheckNotNull(accessToken);
return new AsyncAuthInterceptor((context, metadata) =>
{
metadata.Add(CreateBearerTokenHeader(accessToken));
return TaskUtils.CompletedTask;
});
}
private static Metadata.Entry CreateBearerTokenHeader(string accessToken)
{
return new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken);
}
}
}
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