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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.Collections.Generic;
using System.Threading.Tasks;
using Grpc.Core.Internal;
using Grpc.Core.Utils;
namespace Grpc.Core
{
/// <summary>
/// Client-side call credentials. Provide authorization with per-call granularity.
/// </summary>
public abstract class CallCredentials
{
/// <summary>
/// Composes multiple multiple <c>CallCredentials</c> objects into
/// a single <c>CallCredentials</c> object.
/// </summary>
/// <param name="credentials">credentials to compose</param>
/// <returns>The new <c>CompositeCallCredentials</c></returns>
public static CallCredentials Compose(params CallCredentials[] credentials)
{
return new CompositeCallCredentials(credentials);
}
/// <summary>
/// Creates a new instance of <c>CallCredentials</c> class from an
/// interceptor that can attach metadata to outgoing calls.
/// </summary>
/// <param name="interceptor">authentication interceptor</param>
public static CallCredentials FromInterceptor(AsyncAuthInterceptor interceptor)
{
return new MetadataCredentials(interceptor);
}
/// <summary>
/// Creates native object for the credentials.
/// </summary>
/// <returns>The native credentials.</returns>
internal abstract CallCredentialsSafeHandle ToNativeCredentials();
}
/// <summary>
/// Client-side credentials that delegate metadata based auth to an interceptor.
/// The interceptor is automatically invoked for each remote call that uses <c>MetadataCredentials.</c>
/// </summary>
internal sealed class MetadataCredentials : CallCredentials
{
readonly AsyncAuthInterceptor interceptor;
/// <summary>
/// Initializes a new instance of <c>MetadataCredentials</c> class.
/// </summary>
/// <param name="interceptor">authentication interceptor</param>
public MetadataCredentials(AsyncAuthInterceptor interceptor)
{
this.interceptor = GrpcPreconditions.CheckNotNull(interceptor);
}
internal override CallCredentialsSafeHandle ToNativeCredentials()
{
NativeMetadataCredentialsPlugin plugin = new NativeMetadataCredentialsPlugin(interceptor);
return plugin.Credentials;
}
}
/// <summary>
/// Credentials that allow composing multiple credentials objects into one <see cref="CallCredentials"/> object.
/// </summary>
internal sealed class CompositeCallCredentials : CallCredentials
{
readonly List<CallCredentials> credentials;
/// <summary>
/// Initializes a new instance of <c>CompositeCallCredentials</c> class.
/// The resulting credentials object will be composite of all the credentials specified as parameters.
/// </summary>
/// <param name="credentials">credentials to compose</param>
public CompositeCallCredentials(params CallCredentials[] credentials)
{
GrpcPreconditions.CheckArgument(credentials.Length >= 2, "Composite credentials object can only be created from 2 or more credentials.");
this.credentials = new List<CallCredentials>(credentials);
}
internal override CallCredentialsSafeHandle ToNativeCredentials()
{
return ToNativeRecursive(0);
}
// Recursive descent makes managing lifetime of intermediate CredentialSafeHandle instances easier.
// In practice, we won't usually see composites from more than two credentials anyway.
private CallCredentialsSafeHandle ToNativeRecursive(int startIndex)
{
if (startIndex == credentials.Count - 1)
{
return credentials[startIndex].ToNativeCredentials();
}
using (var cred1 = credentials[startIndex].ToNativeCredentials())
using (var cred2 = ToNativeRecursive(startIndex + 1))
{
var nativeComposite = CallCredentialsSafeHandle.CreateComposite(cred1, cred2);
if (nativeComposite.IsInvalid)
{
throw new ArgumentException("Error creating native composite credentials. Likely, this is because you are trying to compose incompatible credentials.");
}
return nativeComposite;
}
}
}
}
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