* an identity has one or more roles.
* a role requests access to a permission.
* a permission is given to a role.

* many to many relationship between identities and roles.
* many to many relationship between roles and permissions.
* roles can have a parent role (inheriting permissions).

import "github.com/mikespook/gorbac"

rbac := gorbac.New()

rA := gorbac.NewRole("role-a")
rB := gorbac.NewRole("role-b")
rC := gorbac.NewRole("role-c")
rD := gorbac.NewRole("role-d")
rE := gorbac.NewRole("role-e")

pA := gorbac.NewPermission("permission-a")
pB := gorbac.NewPermission("permission-b")
pC := gorbac.NewPermission("permission-c")
pD := gorbac.NewPermission("permission-d")
pE := gorbac.NewPermission("permission-e")

rA.Assign(pA)
rB.Assign(pB)
rC.Assign(pC)
rD.Assign(pD)
rE.Assign(pE)

rbac.Add(rA)
rbac.Add(rB)
rbac.Add(rC)
rbac.Add(rD)
rbac.Add(rE)

rbac.SetParent("role-a", "role-b")
rbac.SetParents("role-b", []string{"role-c", "role-d"})
rbac.SetParent("role-e", "role-d")

if rbac.IsGranted("role-a", pA, nil) &&
	rbac.IsGranted("role-a", pB, nil) &&
	rbac.IsGranted("role-a", pC, nil) &&
	rbac.IsGranted("role-a", pD, nil) {
	fmt.Println("The role-a has been granted permis-a, b, c and d.")
}

rbac.SetParent("role-c", "role-a")
if err := gorbac.InherCircle(rbac); err != nil {
	fmt.Println("A circle inheratance occurred.")
}