/// <summary>
/// Performs authentication with an upstream update service.
/// </summary>
/// <returns>A new access token.</returns>
public async Task <ServiceAccessToken> Authenticate()
{
ServiceAccessToken newAccessToken = new ServiceAccessToken();
newAccessToken.AuthenticationInfo = (await GetAuthenticationInfo()).ToList();
newAccessToken.AuthCookie = await GetAuthorizationCookie(newAccessToken.AuthenticationInfo[0]);
newAccessToken.AccessCookie = await GetServerAccessCookie(newAccessToken.AuthCookie);
return(newAccessToken);
}
/// <summary>
/// Updates the access token of this client
/// </summary>
/// <returns>Nothing</returns>
internal async Task RefreshAccessToken(string accountName, Guid?accountGuid)
{
var progress = new MetadataQueryProgress();
progress.CurrentTask = MetadataQueryStage.AuthenticateStart;
MetadataQueryProgress?.Invoke(this, progress);
var authenticator = new ClientAuthenticator(UpstreamEndpoint, accountName, accountGuid.HasValue ? accountGuid.Value : new Guid());
AccessToken = await authenticator.Authenticate(AccessToken);
progress.CurrentTask = MetadataQueryStage.AuthenticateEnd;
MetadataQueryProgress?.Invoke(this, progress);
}
/// <summary>
/// Performs authentication with an upstream update server, using a previously issued service access token.
/// </summary>
/// <remarks>
/// Refreshing an old token with this method is faster than obtaining a new token as it requires fewer server roundtrips.
///
/// If the access cookie does not expire within 30 minutes, the function succeeds and the old token is returned.
/// </remarks>
/// <param name="cachedAccessToken">The previously issued access token.</param>
/// <returns>The new ServiceAccessToken</returns>
public async Task <ServiceAccessToken> Authenticate(ServiceAccessToken cachedAccessToken)
{
if (cachedAccessToken == null)
{
return(await Authenticate());
}
ServiceAccessToken newAccessToken = new ServiceAccessToken()
{
AuthCookie = cachedAccessToken.AuthCookie,
AccessCookie = cachedAccessToken.AccessCookie,
AuthenticationInfo = cachedAccessToken.AuthenticationInfo
};
// Check if the cached access cookie expires in the next 30 minutes; if not, return the new token
// with this cookie
if (!newAccessToken.ExpiresIn(TimeSpan.FromMinutes(30)))
{
return(newAccessToken);
}
bool restartAuthenticationRequired = false;
// Get a new access cookie
try
{
newAccessToken.AccessCookie = await GetServerAccessCookie(newAccessToken.AuthCookie);
}
catch (UpstreamServerException ex)
{
if (ex.ErrorCode == UpstreamServerErrorCode.InvalidAuthorizationCookie)
{
// The authorization cookie is expired or invalid. Restart the authentication protocol
restartAuthenticationRequired = true;
}
else
{
throw ex;
}
}
return(restartAuthenticationRequired ? await Authenticate() : newAccessToken);
}
