@startuml

skinparam componentStyle uml2

actor User

package "Application" #Pink {
  package "actix-web App" #White {
    component "App" as App
    component "Middleware" as Middleware
    component "Service" as Service
  }
  component "Open Policy Agent" as OPA
}

User -d-> App #Blue : Request
App -d-> Middleware #Blue : Request
Middleware -r-> OPA #Black : Policy check
OPA -l-> Middleware #Black : Policy decision
Middleware -u-> App #Red : If denied
Middleware -u-> Service #Blue : If allowed
Service -l-> App #Blue : Response
App -u-> User #Green : Response

@enduml