private async Task <HttpResponseMessage> ExecuteRequestAsync(string url, HttpMethod httpMethod, RequestToken accessToken = null, Dictionary <string, string> extraOAuthPairs = null, Dictionary <string, string> queryParameters = null, Dictionary <string, string> formData = null)
{
var authorizationParts = new SortedDictionary <string, string>(extraOAuthPairs ?? new Dictionary <string, string>())
{
{ "oauth_consumer_key", Options.ConsumerKey },
{ "oauth_nonce", Guid.NewGuid().ToString("N") },
{ "oauth_signature_method", "HMAC-SHA1" },
{ "oauth_timestamp", GenerateTimeStamp() },
{ "oauth_version", "1.0" }
};
if (accessToken != null)
{
authorizationParts.Add("oauth_token", accessToken.Token);
}
var signatureParts = new SortedDictionary <string, string>(authorizationParts);
if (queryParameters != null)
{
foreach (var queryParameter in queryParameters)
{
signatureParts.Add(queryParameter.Key, queryParameter.Value);
}
}
if (formData != null)
{
foreach (var formItem in formData)
{
signatureParts.Add(formItem.Key, formItem.Value);
}
}
var parameterBuilder = new StringBuilder();
foreach (var signaturePart in signatureParts)
{
parameterBuilder.AppendFormat("{0}={1}&", Uri.EscapeDataString(signaturePart.Key), Uri.EscapeDataString(signaturePart.Value));
}
parameterBuilder.Length--;
var parameterString = parameterBuilder.ToString();
var canonicalizedRequestBuilder = new StringBuilder();
canonicalizedRequestBuilder.Append(httpMethod.Method);
canonicalizedRequestBuilder.Append("&");
canonicalizedRequestBuilder.Append(Uri.EscapeDataString(url));
canonicalizedRequestBuilder.Append("&");
canonicalizedRequestBuilder.Append(Uri.EscapeDataString(parameterString));
var signature = ComputeSignature(Options.ConsumerSecret, accessToken?.TokenSecret, canonicalizedRequestBuilder.ToString());
authorizationParts.Add("oauth_signature", signature);
var queryString = "";
if (queryParameters != null)
{
var queryStringBuilder = new StringBuilder("?");
foreach (var queryParam in queryParameters)
{
queryStringBuilder.AppendFormat("{0}={1}&", queryParam.Key, queryParam.Value);
}
queryStringBuilder.Length--;
queryString = queryStringBuilder.ToString();
}
var authorizationHeaderBuilder = new StringBuilder();
authorizationHeaderBuilder.Append("OAuth ");
foreach (var authorizationPart in authorizationParts)
{
authorizationHeaderBuilder.AppendFormat("{0}=\"{1}\",", authorizationPart.Key, Uri.EscapeDataString(authorizationPart.Value));
}
authorizationHeaderBuilder.Length--;
var request = new HttpRequestMessage(httpMethod, url + queryString);
request.Headers.Add("Authorization", authorizationHeaderBuilder.ToString());
if (formData != null)
{
request.Content = new FormUrlEncodedContent(formData);
}
return(await Backchannel.SendAsync(request, Context.RequestAborted));
}
