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//-----------------------------------------------------------------------
// <copyright file="OAuth1HmacSha1HttpMessageHandler.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OAuth {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
/// <summary>
/// A delegating HTTP handler that signs outgoing HTTP requests
/// with an HMAC-SHA1 signature.
/// </summary>
public class OAuth1HmacSha1HttpMessageHandler : OAuth1HttpMessageHandlerBase {
/// <summary>
/// Initializes a new instance of the <see cref="OAuth1HmacSha1HttpMessageHandler"/> class.
/// </summary>
public OAuth1HmacSha1HttpMessageHandler() {
}
/// <summary>
/// Initializes a new instance of the <see cref="OAuth1HmacSha1HttpMessageHandler"/> class.
/// </summary>
/// <param name="innerHandler">The inner handler which is responsible for processing the HTTP response messages.</param>
public OAuth1HmacSha1HttpMessageHandler(HttpMessageHandler innerHandler)
: base(innerHandler) {
}
/// <summary>
/// Gets the signature method to include in the oauth_signature_method parameter.
/// </summary>
/// <value>
/// The signature method.
/// </value>
protected override string SignatureMethod {
get { return "HMAC-SHA1"; }
}
/// <summary>
/// Calculates the signature for the specified buffer.
/// </summary>
/// <param name="signedPayload">The payload to calculate the signature for.</param>
/// <returns>
/// The signature.
/// </returns>
protected override byte[] Sign(byte[] signedPayload) {
using (var algorithm = HMACSHA1.Create()) {
algorithm.Key = Encoding.ASCII.GetBytes(this.GetConsumerAndTokenSecretString());
return algorithm.ComputeHash(signedPayload);
}
}
}
}
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