#region Copyright notice and license
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// Copyright 2015 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#endregion
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using Google.Apis.Auth.OAuth2;
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using Grpc.Core;
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using Grpc.Core.Utils;
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namespace Grpc.Auth
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{
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/// <summary>
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/// Factory methods to create authorization interceptors for Google credentials.
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/// <seealso cref="GoogleGrpcCredentials"/>
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/// </summary>
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public static class GoogleAuthInterceptors
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{
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private const string AuthorizationHeader = "Authorization";
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private const string Schema = "Bearer";
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/// <summary>
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/// Creates an <see cref="AsyncAuthInterceptor"/> that will obtain access token from any credential type that implements
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/// <c>ITokenAccess</c>. (e.g. <c>GoogleCredential</c>).
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/// </summary>
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/// <param name="credential">The credential to use to obtain access tokens.</param>
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/// <returns>The interceptor.</returns>
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public static AsyncAuthInterceptor FromCredential(ITokenAccess credential)
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{
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return new AsyncAuthInterceptor(async (context, metadata) =>
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{
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var accessToken = await credential.GetAccessTokenForRequestAsync(context.ServiceUrl, CancellationToken.None).ConfigureAwait(false);
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metadata.Add(CreateBearerTokenHeader(accessToken));
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});
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}
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/// <summary>
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/// Creates an <see cref="AsyncAuthInterceptor"/> that will use given access token as authorization.
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/// </summary>
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/// <param name="accessToken">OAuth2 access token.</param>
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/// <returns>The interceptor.</returns>
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public static AsyncAuthInterceptor FromAccessToken(string accessToken)
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{
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GrpcPreconditions.CheckNotNull(accessToken);
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return new AsyncAuthInterceptor((context, metadata) =>
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{
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metadata.Add(CreateBearerTokenHeader(accessToken));
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return TaskUtils.CompletedTask;
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});
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}
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private static Metadata.Entry CreateBearerTokenHeader(string accessToken)
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{
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return new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken);
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}
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}
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}
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