@startuml

Client -> Pathfinder : File request
Pathfinder -> Sentinel : Check authorization

alt User Authorized
  Sentinel -> Pathfinder : Authorized
  Pathfinder -> Fileye : Open stream
  Fileye -> Client : Resource access
else Unauthenticated
  Sentinel -> Pathfinder : Unauthenticated
  Pathfinder -> Client : Unauthenticated
end

@enduml