private string GetAuthenticationHeaderForRequest(Uri requestUri, HttpMethod method)
{
List <KeyValuePair <string, string> > parameters = new List <KeyValuePair <string, string> >()
{
new KeyValuePair <string, string>(Constants.oauth_consumer_key, _apiKey),
new KeyValuePair <string, string>(Constants.oauth_nonce, OAuthHelpers.GenerateNonce()),
new KeyValuePair <string, string>(Constants.oauth_timestamp, OAuthHelpers.GenerateTimestamp()),
new KeyValuePair <string, string>(Constants.oauth_signature_method, "HMAC-SHA1"),
new KeyValuePair <string, string>(Constants.oauth_version, Constants.oauth_version_1a),
new KeyValuePair <string, string>(Constants.oauth_token, _authToken),
};
string baseUri = requestUri.OriginalString;
// We need to handle the case where the request comes with query parameters
if (!string.IsNullOrEmpty(requestUri.Query))
{
baseUri = requestUri.OriginalString.Replace(requestUri.Query, "");
foreach (var param in requestUri.Query.Split(new char[] { '?', '&' }, StringSplitOptions.RemoveEmptyEntries))
{
var values = param.Split('=');
string name = values[0];
string value = string.Empty;
if (values.Length > 1)
{
value = values[1];
}
parameters.Add(new KeyValuePair <string, string>(name, value));
}
}
string baseString = OAuthHelpers.GenerateBaseString(baseUri, method.ToString(), parameters);
Trace.WriteLine($"Base String: {baseString}");
string sig = OAuthHelpers.EncodeValue(OAuthHelpers.GenerateHMACDigest(baseString, _secret, _authTokenSecret));
parameters.Add(new KeyValuePair <string, string>(Constants.oauth_signature, sig));
StringBuilder sb = new StringBuilder();
foreach (var param in parameters)
{
if (param.Key.StartsWith("oauth"))
{
sb.AppendFormat("{0}={1},", param.Key, System.Net.WebUtility.HtmlEncode(param.Value));
}
}
sb.Remove(sb.Length - 1, 1);
return(sb.ToString());
}