private SessionInfo DoRenewSession(string tokenId, bool validateOnly)
{
SessionInfo sessionInfo = SessionCache.Instance.Find(tokenId);
if (sessionInfo == null)
{
throw new Exception(String.Format("Unexpected error: session {0} does not exist in the cache", tokenId));
}
var request = new ValidateSessionRequest(sessionInfo.Credentials.UserName,
sessionInfo.Credentials.SessionToken)
{
GetAuthorizations = true,
ValidateOnly = validateOnly
};
SessionToken newToken = null;
Platform.GetService(
delegate(IAuthenticationService service)
{
ValidateSessionResponse response = service.ValidateSession(request);
//If we're renewing, might as well renew well before expiry. If we're only validating,
//we don't want to force a call to the server unless it's actually expired.
var addSeconds = 0.0;
//Minor hack - the ImageServer client shows a little bar at the top of the page counting down to session timeout,
//and allowing the user to cancel. This timeout value determines when that bar shows up. If, however, the
//validate response is being cached, we need to make sure we hit the server - otherwise the bar doesn't go away.
double.TryParse(ConfigurationManager.AppSettings.Get("ClientTimeoutWarningMinDuration"), out addSeconds);
addSeconds = Math.Max(addSeconds, 30);
if (Platform.Time.AddSeconds(addSeconds) >= response.SessionToken.ExpiryTime)
{
Platform.Log(LogLevel.Debug, "Session is at or near expiry; bypassing cache.");
//The response likely came from the cache, and we want to make sure we get a real validation response.
//Note that this only really matters when 2 processes are sharing a session, like ImageServer and Webstation.
using (new ResponseCacheBypassScope())
{
response = service.ValidateSession(request);
}
}
// update session info
string id = response.SessionToken.Id;
newToken = SessionCache.Instance.Renew(id, response.SessionToken.ExpiryTime);
sessionInfo.Credentials.Authorities = response.AuthorityTokens;
sessionInfo.Credentials.SessionToken = newToken;
if (Platform.IsLogLevelEnabled(LogLevel.Debug))
{
Platform.Log(LogLevel.Debug, "Session {0} for {1} is renewed. Valid until {2}", id,
sessionInfo.Credentials.UserName, newToken.ExpiryTime);
}
});
return sessionInfo;
}
