// See https://dev.twitter.com/docs/auth/authorizing-request
public async Task <Boolean> UpdateStatus(String status) // a.k.a. tweet
{
IsTweeting = true;
Status = "Tweeting";
var header = new TwitterRtDictionary();
header.Add("oauth_consumer_key", _consumerKey);
header.Add("oauth_nonce", GenerateNonce());
header.Add("oauth_signature_method", _signatureMethod);
header.Add("oauth_timestamp", GenerateSinceEpoch());
header.Add("oauth_token", OauthToken);
header.Add("oauth_version", _oauthVersion);
var request = new TwitterRtDictionary();
request.Add("status", Uri.EscapeDataString(status));
var response = await PostData(_updateStatusUrl, header, request);
IsTweeting = false;
if (response.Status == TwitterRtPostResults.EStatus.Success)
{
Status = status;
return(true);
}
else
{
Status = response.Description;
return(false);
}
}
public void Add(TwitterRtDictionary src)
{
if (src != null)
{
foreach (var kvp in src)
{
Add(kvp.Key, kvp.Value);
}
}
}
// Step 1: Obtaining a request token
async Task <TwitterRtPostResults> Step1()
{
var header = new TwitterRtDictionary();
header.Add("oauth_callback", Uri.EscapeDataString(_callbackUrl));
header.Add("oauth_consumer_key", _consumerKey);
header.Add("oauth_nonce", GenerateNonce());
header.Add("oauth_signature_method", _signatureMethod);
header.Add("oauth_timestamp", GenerateSinceEpoch());
header.Add("oauth_version", _oauthVersion);
return(await PostData(_requestTokenUrl, header)); // should contain oauth_token, oauth_token_secret, and oauth_callback_confirmed
}
// Step 3: Converting the request token to an access token
async Task <TwitterRtPostResults> Step3(String oauthToken, String oauthVerifier)
{
var header = new TwitterRtDictionary();
header.Add("oauth_consumer_key", _consumerKey);
header.Add("oauth_nonce", GenerateNonce());
header.Add("oauth_signature_method", _signatureMethod);
header.Add("oauth_timestamp", GenerateSinceEpoch());
header.Add("oauth_token", oauthToken);
header.Add("oauth_version", _oauthVersion);
var request = new TwitterRtDictionary();
request.Add("oauth_verifier", Uri.EscapeDataString(oauthVerifier));
return(await PostData(_accessTokenUrl, header, request)); // should contain oauth_token, oauth_token_secret, user_id, and screen_name
}
async Task <TwitterRtPostResults> PostData(String url, TwitterRtDictionary headerDictionary, TwitterRtDictionary requestDictionary = null)
{
// See https://dev.twitter.com/docs/auth/creating-signature
var combinedDictionaries = new TwitterRtDictionary(headerDictionary);
combinedDictionaries.Add(requestDictionary);
var signatureBase = "POST&" + Uri.EscapeDataString(url) + "&" + Uri.EscapeDataString(combinedDictionaries.ToStringA());
var keyMaterial = CryptographicBuffer.ConvertStringToBinary(_consumerSecret + "&" + OauthTokenSecret, BinaryStringEncoding.Utf8);
var algorithm = MacAlgorithmProvider.OpenAlgorithm("HMAC_SHA1");
var key = algorithm.CreateKey(keyMaterial);
var dataToBeSigned = CryptographicBuffer.ConvertStringToBinary(signatureBase, BinaryStringEncoding.Utf8);
var signatureBuffer = CryptographicEngine.Sign(key, dataToBeSigned);
var signature = CryptographicBuffer.EncodeToBase64String(signatureBuffer);
var headers = "OAuth " + headerDictionary.ToStringQ() + ", oauth_signature=\"" + Uri.EscapeDataString(signature) + "\"";
return(await PostData(url, headers, (requestDictionary == null)?String.Empty : requestDictionary.ToString()));
}
public TwitterRtDictionary(TwitterRtDictionary src)
{
Add(src);
}
