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#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.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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