Migrate C# to the new auth API

3 files changed, 105 insertions, 13 deletions

diff --git a/src/csharp/Grpc.Auth/AuthInterceptors.cs b/src/csharp/Grpc.Auth/AuthInterceptors.cs
index c8ab4d9af6..fa92566775 100644
--- a/src/csharp/Grpc.Auth/AuthInterceptors.cs
+++ b/src/csharp/Grpc.Auth/AuthInterceptors.cs
@@ -41,8 +41,8 @@ using Grpc.Core.Utils;
 namespace Grpc.Auth
 {
     /// <summary>
-    /// Factory methods to create authorization interceptors. Interceptors created can be registered with gRPC client classes (autogenerated client stubs that
-    /// inherit from <see cref="Grpc.Core.ClientBase"/>).
+    /// Factory methods to create authorization interceptors.
+    /// <seealso cref="GrpcCredentials"/>
     /// </summary>
     public static class AuthInterceptors
     {
@@ -50,31 +50,29 @@ namespace Grpc.Auth
         private const string Schema = "Bearer";
 
         /// <summary>
-        /// Creates interceptor that will obtain access token from any credential type that implements
+        /// 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 header interceptor.</returns>
-        public static HeaderInterceptor FromCredential(ITokenAccess credential)
+        /// <returns>The interceptor.</returns>
+        public static AsyncAuthInterceptor FromCredential(ITokenAccess credential)
         {
-            return new HeaderInterceptor((method, authUri, metadata) =>
+            return new AsyncAuthInterceptor(async (authUri, metadata) =>
             {
-                // TODO(jtattermusch): Rethink synchronous wait to obtain the result.
-                var accessToken = credential.GetAccessTokenForRequestAsync(authUri, CancellationToken.None)
-                        .ConfigureAwait(false).GetAwaiter().GetResult();
+                var accessToken = await credential.GetAccessTokenForRequestAsync(authUri, CancellationToken.None).ConfigureAwait(false);
                 metadata.Add(CreateBearerTokenHeader(accessToken));
             });
         }
 
         /// <summary>
-        /// Creates OAuth2 interceptor that will use given access token as authorization.
+        /// Creates an <see cref="AsyncAuthInterceptor"/> that will use given access token as authorization.
         /// </summary>
         /// <param name="accessToken">OAuth2 access token.</param>
-        /// <returns>The header interceptor.</returns>
-        public static HeaderInterceptor FromAccessToken(string accessToken)
+        /// <returns>The interceptor.</returns>
+        public static AsyncAuthInterceptor FromAccessToken(string accessToken)
         {
             Preconditions.CheckNotNull(accessToken);
-            return new HeaderInterceptor((method, authUri, metadata) =>
+            return new AsyncAuthInterceptor(async (authUri, metadata) =>
             {
                 metadata.Add(CreateBearerTokenHeader(accessToken));
             });
diff --git a/src/csharp/Grpc.Auth/Grpc.Auth.csproj b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
index 4fb087d4a3..80ab07d2ae 100644
--- a/src/csharp/Grpc.Auth/Grpc.Auth.csproj
+++ b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
@@ -78,6 +78,7 @@
     <Compile Include="..\Grpc.Core\Version.cs">
       <Link>Version.cs</Link>
     </Compile>
+    <Compile Include="GrpcCredentials.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="AuthInterceptors.cs" />
   </ItemGroup>
diff --git a/src/csharp/Grpc.Auth/GrpcCredentials.cs b/src/csharp/Grpc.Auth/GrpcCredentials.cs
new file mode 100644
index 0000000000..496d8e1416
--- /dev/null
+++ b/src/csharp/Grpc.Auth/GrpcCredentials.cs
@@ -0,0 +1,93 @@
+#region Copyright notice and license
+
+// Copyright 2015, 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 instances of <see cref="Credentials"/> class.
+    /// </summary>
+    public static class GrpcCredentials
+    {
+        /// <summary>
+        /// Creates a <see cref="MetadataCredentials"/> instance that will obtain access tokens 
+        /// from any credential 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 <c>MetadataCredentials</c> instance.</returns>
+        public static MetadataCredentials Create(ITokenAccess credential)
+        {
+            return new MetadataCredentials(AuthInterceptors.FromCredential(credential));
+        }
+
+        /// <summary>
+        /// Convenience method to create a <see cref="CompositeCredentials"/> instance from
+        /// <c>ITokenAccess</c> credential and <c>SslCredentials</c> instance.
+        /// </summary>
+        /// <param name="credential">The credential to use to obtain access tokens.</param>
+        /// <param name="sslCredentials">The <c>SslCredentials</c> instance.</param>
+        /// <returns>The composite credential for access token based auth over a secure channel.</returns>
+        public static CompositeCredentials Create(ITokenAccess credential, SslCredentials sslCredentials)
+        {
+            return CompositeCredentials.Create(Create(credential), sslCredentials);
+        }
+
+        /// <summary>
+        /// Creates an instance of <see cref="MetadataCredentials"/> that will use given access token to authenticate
+        /// with a gRPC service.
+        /// </summary>
+        /// <param name="accessToken">OAuth2 access token.</param>
+        /// /// <returns>The <c>MetadataCredentials</c> instance.</returns>
+        public static MetadataCredentials FromAccessToken(string accessToken)
+        {
+            return new MetadataCredentials(AuthInterceptors.FromAccessToken(accessToken));
+        }
+
+        /// <summary>
+        /// Converts a <c>ITokenAccess</c> object into a <see cref="MetadataCredentials"/> object supported
+        /// by gRPC.
+        /// </summary>
+        /// <param name="credential"></param>
+        /// <returns></returns>
+        public static MetadataCredentials ToGrpcCredentials(this ITokenAccess credential)
+        {
+            return GrpcCredentials.Create(credential);
+        }
+    }
+}