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// Copyright (c) Service Stack LLC. All Rights Reserved.
// License: https://raw.github.com/ServiceStack/ServiceStack/master/license.txt
#if !(PCL || SL5)
using System;
using System.Collections.Generic;
using System.Security.Cryptography;
namespace ServiceStack
{
public class GetPublicKey : IReturn<string> { }
public class EncryptedMessage : IReturn<EncryptedMessageResponse>
{
public string SymmetricKeyEncrypted { get; set; }
public string EncryptedBody { get; set; }
}
public class EncryptedMessageResponse
{
public string EncryptedBody { get; set; }
}
public class EncryptedServiceClient : IEncryptedClient
{
public string PublicKeyPath { get; set; }
public string PublicKeyXml { get; set; }
public RSAParameters? PublicKey { get; set; }
public IServiceClient Client { get; set; }
public EncryptedServiceClient(IServiceClient client)
{
PublicKeyPath = "/publickey";
Client = client;
}
private RSAParameters GetPublicKey()
{
if (PublicKey == null)
{
if (PublicKeyXml == null)
{
PublicKeyXml = Client.Get<string>(PublicKeyPath);
}
PublicKey = PublicKeyXml.ToPublicRSAParameters();
}
return PublicKey.Value;
}
public TResponse Send<TResponse>(object request)
{
using (var aes = new AesManaged { KeySize = AesUtils.KeySize })
{
try
{
var encryptedMessage = CreateEncryptedMessage(request, aes);
var encResponse = Client.Send(encryptedMessage);
var responseJson = AesUtils.Decrypt(encResponse.EncryptedBody, aes.Key, aes.IV);
var response = responseJson.FromJson<TResponse>();
return response;
}
catch (WebServiceException ex)
{
throw DecryptedException(ex, aes);
}
}
}
public EncryptedMessage CreateEncryptedMessage(object request, SymmetricAlgorithm aes)
{
var aesKeyBytes = aes.Key.Combine(aes.IV);
var publicKey = GetPublicKey();
var rsaEncAesKeyBytes = RsaUtils.Encrypt(aesKeyBytes, publicKey);
var requestType = request.GetType();
var requestBody = requestType.Name + " " + request.ToJson();
var encryptedMessage = new EncryptedMessage
{
SymmetricKeyEncrypted = Convert.ToBase64String(rsaEncAesKeyBytes),
EncryptedBody = AesUtils.Encrypt(requestBody, aes.Key, aes.IV)
};
return encryptedMessage;
}
public TResponse Send<TResponse>(IReturn<TResponse> request)
{
return Send<TResponse>((object)request);
}
public void Send(IReturnVoid request)
{
using (var aes = new AesManaged { KeySize = AesUtils.KeySize })
{
try
{
var encryptedMessage = CreateEncryptedMessage(request, aes);
Client.SendOneWay(encryptedMessage);
}
catch (WebServiceException ex)
{
throw DecryptedException(ex, aes);
}
}
}
public WebServiceException DecryptedException(WebServiceException ex, SymmetricAlgorithm aes)
{
var encResponse = ex.ResponseDto as EncryptedMessageResponse;
if (encResponse != null)
{
var responseJson = AesUtils.Decrypt(encResponse.EncryptedBody, aes.Key, aes.IV);
var errorResponse = responseJson.FromJson<ErrorResponse>();
ex.ResponseDto = errorResponse;
}
return ex;
}
public List<TResponse> SendAll<TResponse>(IEnumerable<IReturn<TResponse>> requests)
{
throw new NotImplementedException();
}
}
public static partial class ServiceClientExtensions
{
public static IEncryptedClient GetEncryptedClient(this IServiceClient client)
{
return new EncryptedServiceClient(client);
}
}
}
#endif