To implement an access-checker plugin, the
AccessCheckerFactory interface
must be implemented, and it must be annotated by a @Named(value = "KEY")
annotation. KEY is the name of the access-checker that can be used when
running the proxy server (by setting ACCESS_CHECKER environment variable).
Example access-checker plugins in this module are ListAccessChecker and PatientAccessChecker.
Beside doing basic validation of the access-token, the server also provides some query parameters and resource parsing functionality which are wrapped inside PatientFinder.