private string GenerateSignature(Uri uri, MethodType methodType, Token token, IEnumerable<KeyValuePair<string, object>> parameters)
{
var hmacKeyBase = ConsumerSecret.UrlEncode() + "&" + ((token == null) ? "" : token.Secret).UrlEncode();
using (var hmacsha1 = new HMACSHA1(Encoding.UTF8.GetBytes(hmacKeyBase)))
{
var stringParameter = parameters.OrderBy(p => p.Key)
.ThenBy(p => p.Value)
.ToQueryParameter();
var signatureBase = methodType.ToString().ToUpper() +
"&" + uri.GetComponents(UriComponents.SchemeAndServer | UriComponents.Path, UriFormat.Unescaped).UrlEncode() +
"&" + stringParameter.UrlEncode();
var hash = hmacsha1.ComputeHash(Encoding.UTF8.GetBytes(signatureBase));
return Convert.ToBase64String(hash).UrlEncode();
}
}
protected IDictionary<string,object> ConstructBasicParameters(string url, MethodType methodType, Token token, params KeyValuePair<string,object>[] optionalParameters)
{
Enforce.NotNull(url, "url");
Enforce.NotNull(optionalParameters, "optionalParameters");
var parameters = new Dictionary<string, object>
{
{ "oauth_consumer_key", ConsumerKey },
{ "oauth_nonce", _random.Next() },
{ "oauth_timestamp", DateTime.UtcNow.ToUnixTime() },
{ "oauth_signature_method", "HMAC-SHA1" },
{ "oauth_version", "1.0" }
};
if (token != null)
parameters.Add("oauth_token", token.Key);
var signature = GenerateSignature(new Uri(url), methodType, token, parameters.Concat(optionalParameters));
parameters.Add("oauth_signature", signature);
return parameters;
}