public string GetSignedUrl()
{
var signature = GetSignature();
string url = _normalizedUrl
+ "?" + _normalizedParameters
+ "&oauth_signature=" + EncodingUtility.UrlEncode(signature);
return(url);
}
private string GetSignatureBase()
{
var elements = _parameterMap
.Select(parameter => parameter.Key + '=' + parameter.Value)
.ToArray();
_normalizedParameters = string.Join("&", elements);
var signatureBase = _httpMethod
+ '&' + EncodingUtility.UrlEncode(_normalizedUrl)
+ '&' + EncodingUtility.UrlEncode(_normalizedParameters);
return(signatureBase);
}
private string GetSignature()
{
if (_parameterMap.Get("oauth_signature_method") != "HMAC-SHA1")
{
throw new ArgumentException("SignatureMethod HMAC-SHA1 is mandatory");
}
var tokenSecret = string.IsNullOrEmpty(_tokenSecret) ? "" : EncodingUtility.UrlEncode(_tokenSecret);
var secret = EncodingUtility.UrlEncode(_consumerSecret) + '&' + tokenSecret;
var hmacsha1 = new HMACSHA1 {
Key = Encoding.ASCII.GetBytes(secret)
};
var signatureBase = GetSignatureBase();
return(ComputeHash(hmacsha1, signatureBase));
}
public OAuthUrlProvider Callback(string callback)
{
_parameterMap.Set("oauth_callback", EncodingUtility.UrlEncode(callback));
return(this);
}