public Task<bool> ChangeConnectionAsync(CrunchAuthorisationParameters crunchAuthorisationParameters)
{
return Task.Factory.StartNew(
() =>
{
var consumer = CreateConsumer(crunchAuthorisationParameters);
string requestToken;
var userAuthorisationUri = consumer.RequestUserAuthorization(new Dictionary<string, string>(),
new Dictionary<string, string>(),
out requestToken);
var verifierTask = _requestTokenVerifier.Verify(userAuthorisationUri);
// wait synchronously for the result. We're already on a background thread, so we won't block the UI
var verifier = verifierTask.Result;
if (verifier != null)
{
var result = consumer.ProcessUserAuthorization(requestToken, verifier);
StoreParametersAndAccessToken(crunchAuthorisationParameters, result.AccessToken);
RaiseConnectionStatucChanged(EventArgs.Empty);
return true;
}
else
{
return false;
}
});
}
private void StoreParametersAndAccessToken(CrunchAuthorisationParameters crunchAuthorisationParameters, string accessToken)
{
Settings.Default.AccessTokenEndpoint = crunchAuthorisationParameters.AccessTokenEndpoint;
Settings.Default.RequestTokenEndpoint = crunchAuthorisationParameters.RequestTokenEndpoint;
Settings.Default.UserAuthorizationEndpoint = crunchAuthorisationParameters.UserAuthorizationEndpoint;
Settings.Default.ConsumerKey = crunchAuthorisationParameters.ConsumerKey;
Settings.Default.SharedSecret = crunchAuthorisationParameters.SharedSecret.EncryptAndEncodeAsBase64();
Settings.Default.AccessToken = accessToken.EncryptAndEncodeAsBase64();
Settings.Default.Save();
}
private static DesktopConsumer CreateConsumer(CrunchAuthorisationParameters crunchAuthorisationParameters)
{
var tokenManager = new InMemoryTokenManager(crunchAuthorisationParameters.ConsumerKey,
crunchAuthorisationParameters.SharedSecret);
var serviceProviderDescription = CreateServiceProviderDescription(crunchAuthorisationParameters);
var consumer = new DesktopConsumer(serviceProviderDescription, tokenManager);
return consumer;
}
private static ServiceProviderDescription CreateServiceProviderDescription(CrunchAuthorisationParameters crunchAuthorisationParameters)
{
return new ServiceProviderDescription()
{
ProtocolVersion = ProtocolVersion.V10a,
RequestTokenEndpoint =
new MessageReceivingEndpoint(crunchAuthorisationParameters.RequestTokenEndpoint,
HttpDeliveryMethods.PostRequest |HttpDeliveryMethods.AuthorizationHeaderRequest),
AccessTokenEndpoint =
new MessageReceivingEndpoint(crunchAuthorisationParameters.AccessTokenEndpoint,
HttpDeliveryMethods.PostRequest |HttpDeliveryMethods.AuthorizationHeaderRequest),
UserAuthorizationEndpoint =
new MessageReceivingEndpoint(crunchAuthorisationParameters.UserAuthorizationEndpoint,
HttpDeliveryMethods.PostRequest |HttpDeliveryMethods.AuthorizationHeaderRequest),
TamperProtectionElements =
new ITamperProtectionChannelBindingElement[] {new HmacSha1SigningBindingElement()},
};
}
public CrunchAuthorisationParameters GetCurrentAuthorisationParameters()
{
var crunchAuthorisationParameters = new CrunchAuthorisationParameters(
sharedSecret: Settings.Default.SharedSecret.IsNullOrWhiteSpace() ? "": Settings.Default.SharedSecret.DecryptBase64EncodedString(),
accessTokenEndpoint: Settings.Default.AccessTokenEndpoint,
consumerKey: Settings.Default.ConsumerKey,
requestTokenEndpoint: Settings.Default.RequestTokenEndpoint,
userAuthorizationEndpoint: Settings.Default.UserAuthorizationEndpoint
);
return crunchAuthorisationParameters;
}
