/// <summary>
/// Generates an OAuth header.
/// </summary>
/// <param name="uri">The URI of the request</param>
/// <param name="httpMethod">The http method</param>
/// <param name="parameters">The OAuth parameters</param>
/// <returns>The OAuth authorization header</returns>
public static string GenerateHeader(Uri uri, string httpMethod, OAuthParameters parameters)
{
parameters.Timestamp = OAuthBase.GenerateTimeStamp();
parameters.Nonce = OAuthBase.GenerateNonce();
string signature = OAuthBase.GenerateSignature(uri, httpMethod, parameters);
StringBuilder sb = new StringBuilder();
sb.AppendFormat("Authorization: OAuth {0}=\"{1}\",", OAuthBase.OAuthVersionKey, OAuthBase.OAuthVersion);
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthNonceKey, OAuthBase.EncodingPerRFC3986(parameters.Nonce));
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthTimestampKey, OAuthBase.EncodingPerRFC3986(parameters.Timestamp));
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthConsumerKeyKey, OAuthBase.EncodingPerRFC3986(parameters.ConsumerKey));
if (parameters.BaseProperties.ContainsKey(OAuthBase.OAuthVerifierKey))
{
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthVerifierKey, OAuthBase.EncodingPerRFC3986(parameters.BaseProperties[OAuthBase.OAuthVerifierKey]));
}
if (!String.IsNullOrEmpty(parameters.Token))
{
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthTokenKey, OAuthBase.EncodingPerRFC3986(parameters.Token));
}
if (parameters.BaseProperties.ContainsKey(OAuthBase.OAuthCallbackKey))
{
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthCallbackKey, OAuthBase.EncodingPerRFC3986(parameters.BaseProperties[OAuthBase.OAuthCallbackKey]));
}
sb.AppendFormat("{0}=\"{1}\",", OAuthBase.OAuthSignatureMethodKey, OAuthBase.HMACSHA1SignatureType);
sb.AppendFormat("{0}=\"{1}\"", OAuthBase.OAuthSignatureKey, OAuthBase.EncodingPerRFC3986(signature));
return(sb.ToString());
}
/// <summary>
/// Generates the url which the user should visit in order to authenticate and
/// authorize with the Service Provider.
/// When successful, updates the OAuthParameter instance passed as parameter by setting
/// Token and TokenSecret.
/// </summary>
/// <param name="parameters">The OAuth parameters</param>
/// <returns>The full authorization url the user should visit</returns>
public static string CreateUserAuthorizationUrl(OAuthParameters parameters)
{
StringBuilder sb = new StringBuilder();
sb.Append(userAuthorizationUrl);
sb.AppendFormat("?{0}={1}", OAuthBase.OAuthTokenKey, OAuthBase.EncodingPerRFC3986(parameters.Token));
if (!string.IsNullOrEmpty(parameters.Callback))
{
sb.AppendFormat("&{0}={1}", OAuthBase.OAuthCallbackKey, OAuthBase.EncodingPerRFC3986(parameters.Callback));
}
return(sb.ToString());
}
/// <summary>
/// Generates the url which the user should visit in order to authenticate and
/// authorize with the Service Provider.
/// When successful, updates the OAuth2Parameters instance passed as parameter by setting
/// the returned access code.
/// </summary>
/// <param name="parameters">The OAuth 2.0 parameters</param>
/// <returns>The full authorization url the user should visit</returns>
public static string CreateOAuth2AuthorizationUrl(OAuth2Parameters parameters)
{
StringBuilder sb = new StringBuilder();
sb.Append(parameters.AuthUri);
sb.AppendFormat("?{0}={1}", OAuthBase.OAuth2ResponseType, OAuthBase.EncodingPerRFC3986(parameters.ResponseType));
sb.AppendFormat("&{0}={1}", OAuthBase.OAuth2ClientId, OAuthBase.EncodingPerRFC3986(parameters.ClientId));
sb.AppendFormat("&{0}={1}", OAuthBase.OAuth2RedirectUri, OAuthBase.EncodingPerRFC3986(parameters.RedirectUri));
sb.AppendFormat("&{0}={1}", OAuthBase.OAuthScopeKey, OAuthBase.EncodingPerRFC3986(parameters.Scope));
sb.AppendFormat("&{0}={1}", OAuthBase.OAuth2AccessType, OAuthBase.EncodingPerRFC3986(parameters.AccessType));
sb.AppendFormat("&{0}={1}", OAuthBase.OAuth2ApprovalPrompt, OAuthBase.EncodingPerRFC3986(parameters.ApprovalPrompt));
if (!string.IsNullOrEmpty(parameters.State))
{
sb.AppendFormat("&{0}={1}", OAuthBase.OAuth2State, OAuthBase.EncodingPerRFC3986(parameters.State));
}
return(sb.ToString());
}
/// <summary>
/// Contacts Google for a request token, first step of the OAuth authentication process.
/// When successful, updates the OAuthParameter instance passed as parameter by setting
/// Token and TokenSecret.
/// </summary>
/// <param name="parameters">The OAuth parameters</param>
public static void GetUnauthorizedRequestToken(OAuthParameters parameters)
{
Uri requestUri = new Uri(string.Format("{0}?scope={1}", requestTokenUrl, OAuthBase.EncodingPerRFC3986(parameters.Scope)));
// callback is only needed when getting the request token
bool callbackExists = false;
if (!string.IsNullOrEmpty(parameters.Callback))
{
parameters.BaseProperties.Add(OAuthBase.OAuthCallbackKey, parameters.Callback);
callbackExists = true;
}
string headers = GenerateHeader(requestUri, "GET", parameters);
WebRequest request = WebRequest.Create(requestUri);
request.Headers.Add(headers);
WebResponse response = request.GetResponse();
string result = "";
if (response != null)
{
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
result = reader.ReadToEnd();
}
if (callbackExists)
{
parameters.BaseProperties.Remove(OAuthBase.OAuthCallbackKey);
}
// split results and update parameters
SortedDictionary <string, string> responseValues = OAuthBase.GetQueryParameters(result);
parameters.Token = responseValues[OAuthBase.OAuthTokenKey];
parameters.TokenSecret = responseValues[OAuthBase.OAuthTokenSecretKey];
}