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#region Copyright notice and license
// Copyright 2015-2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Threading;
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(async (context, metadata) =>
{
metadata.Add(CreateBearerTokenHeader(accessToken));
});
}
private static Metadata.Entry CreateBearerTokenHeader(string accessToken)
{
return new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken);
}
}
}
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