[keycloak-user] Implicit Flow with the Spring Boot adapter

We have a scenario in which the application does not have access to the Keycloak server, but the user does. In this case, the user is on our our internal corporate network along with the Keycloak server, while the application lives in the public Internet. We can send the user from the public application to Keycloak to login in, but the application cannot communicate back with Keycloak to verify the token coming back when the user returns. It is my understanding that "Implicit Flow" should allow for this scenario: https://keycloak.gitbooks.io/documentation/securing_apps/topics/oidc/oidc... But I cannot figure out how to implement this with the Spring Boot adapter. It seems to me that the adapter should have a way to decrypt and validate the JWT token locally (making sure the short-lived access token has not expired), then trust the token as implicitly granted and proceed to set a session cookie with a different timeout configured in the Keycloak administrator. Is this available in Keycloak somewhere that I just missing? Or perhaps you have another suggestion for how to do this? Note that I recognize implicit flow is inherently flawed because it passes the access token to the user (vulnerable to man-in-the-middle type leaks). Still, it's part of the OIDC spec, and it seems that security concerns can be somewhat mitigated with a short expiration on the Access Token and a configurable expiration of the resulting client session expiration via Keycloak. Suggestions? Thanks, Jonathan -- Jonathan D'Andries http://www.linkedin.com/in/jonathandandries/