/// <summary>
/// Authenticates this <see cref="Budgie.TwitterClient"/> by requesting an OAuth access token and token_secret from Twitter.
/// </summary>
/// <param name="requestToken">An OAuth request token.</param>
/// <param name="verifier">A verification PIN obtained by the user from Twitter.</param>
/// <returns>An instance of <see cref="TwitterAccessToken"/> with the tokens returned from Twitter.</returns>
public Task <TwitterAccessToken> AuthenticateAsync(TwitterRequestToken requestToken, string verifier)
{
return(HttpPostAsync("/oauth/access_token", "oauth_verifier=" + verifier, requestToken).ContinueWith(t =>
{
if (t.IsFaulted)
{
return null;
}
var response = t.Result as HttpWebResponse;
if (response.StatusCode != HttpStatusCode.OK)
{
return null;
}
string responseString = response.GetContentString();
if (responseString.IsNullOrWhiteSpace())
{
return null;
}
var result = new TwitterAccessToken();
foreach (var i in responseString.Split('&'))
{
var kv = i.Split('=');
if (kv.Length < 2)
{
continue;
}
if (kv[0] == "oauth_token")
{
result.Token = kv[1];
}
else if (kv[0] == "oauth_token_secret")
{
result.Secret = kv[1];
}
else if (kv[0] == "user_id")
{
result.UserId = kv[1];
}
else if (kv[0] == "screen_name")
{
result.ScreenName = kv[1];
}
}
if (!result.IsValid)
{
return null;
}
return (m_accessToken = result);
}));
}
// mad props to http://www.codeproject.com/Articles/247336/Twitter-OAuth-authentication-using-Net
/// <summary>
/// Gets an AOuth request token from Twitter.
/// </summary>
/// <returns>A valid <see cref="TwitterRequestToken"/>.</returns>
public Task <TwitterRequestToken> GetRequestTokenAsync(Uri callbackUri = null)
{
// this is very similar to all the other OAuth requests except that at this point we don't
// have any tokens to pass along with the request, so for now I'm keeping this logic separate.
var request = (HttpWebRequest)WebRequest.Create(new Uri(BaseUri, "/oauth/request_token"));
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
var oauth_nonce = Convert.ToBase64String(UTF8Encoding.UTF8.GetBytes(DateTime.Now.Ticks.ToString()));
var timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
var resource_url = request.RequestUri.GetComponents(UriComponents.SchemeAndServer | UriComponents.Path, UriFormat.Unescaped);
var parms = new SortedDictionary <string, string>
{
{ "oauth_consumer_key", m_consumerKey },
{ "oauth_nonce", oauth_nonce },
{ "oauth_signature_method", "HMAC-SHA1" },
{ "oauth_timestamp", oauth_timestamp },
{ "oauth_version", "1.0" },
};
if (callbackUri != null)
{
parms.Add("oauth_callback", Uri.EscapeDataString(callbackUri.ToString()));
}
if (!String.IsNullOrEmpty(request.RequestUri.Query))
{
foreach (var p in request.RequestUri.Query.Substring(1).Split('&'))
{
var kv = p.Split('=');
parms.Add(kv[0], kv[1]);
}
}
var baseString = parms.First().Key + "=" + parms.First().Value;
foreach (var p in parms.Skip(1))
{
baseString += "&" + p.Key + "=" + p.Value;
}
baseString = request.Method + "&" + Uri.EscapeDataString(resource_url) + "&" + Uri.EscapeDataString(baseString);
var compositeKey = Uri.EscapeDataString(m_consumerSecret) + "&";
var oauth_signature = m_platformAdaptor.ComputeSha1Hash(compositeKey, baseString);
//using (var hasher = new HMACSHA1(UTF8Encoding.UTF8.GetBytes(compositeKey)))
//{
// oauth_signature = Convert.ToBase64String(hasher.ComputeHash(UTF8Encoding.UTF8.GetBytes(baseString)));
//}
string authHeader;
if (callbackUri == null)
{
authHeader = string.Format("OAuth oauth_nonce=\"{0}\", oauth_signature_method=\"HMAC-SHA1\", oauth_timestamp=\"{1}\", oauth_consumer_key=\"{2}\", oauth_signature=\"{3}\", oauth_version=\"1.0\"",
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(m_consumerKey),
Uri.EscapeDataString(oauth_signature));
}
else
{
authHeader = string.Format("OAuth oauth_callback=\"{0}\", oauth_nonce=\"{1}\", oauth_signature_method=\"HMAC-SHA1\", oauth_timestamp=\"{2}\", oauth_consumer_key=\"{3}\", oauth_signature=\"{4}\", oauth_version=\"1.0\"",
Uri.EscapeDataString(callbackUri.ToString()),
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(m_consumerKey),
Uri.EscapeDataString(oauth_signature));
}
request.Headers["Authorization"] = authHeader;
return(request.GetResponseAsync(Timeout).ContinueWith(t =>
{
if (t.IsFaulted)
{
return null;
}
var response = t.Result as HttpWebResponse;
if (response.StatusCode != HttpStatusCode.OK)
{
return null;
}
string responseString = response.GetContentString();
if (responseString.IsNullOrWhiteSpace())
{
return null;
}
var result = new TwitterRequestToken(BaseUri);
foreach (var i in responseString.Split('&'))
{
var kv = i.Split('=');
if (kv.Length < 2)
{
continue;
}
if (kv[0] == "oauth_callback_confirmed")
{
if (kv[1] != "true")
{
return null;
}
}
else if (kv[0] == "oauth_token")
{
result.Token = kv[1];
}
else if (kv[0] == "oauth_token_secret")
{
result.Secret = kv[1];
}
}
return result.IsValid ? result : null;
}));
}
