Implement scopes

internal/dis/component/auth/scopes/user.go

@@ -0,0 +1,32 @@
+package scopes
+
+import (
+	"net/http"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/dis/component"
+	"github.com/FAU-CDI/wisski-distillery/internal/dis/component/auth"
+)
+
+type UserLoggedIn struct {
+	component.Base
+	Dependencies struct {
+		Auth *auth.Auth
+	}
+}
+
+var (
+	_ component.ScopeProvider = (*UserLoggedIn)(nil)
+)
+
+func (*UserLoggedIn) Scope() component.ScopeInfo {
+	return component.ScopeInfo{
+		Scope:       component.ScopeUserLoggedIn,
+		Description: "session has an associated user",
+		TakesParam:  false,
+	}
+}
+
+func (iu *UserLoggedIn) HasScope(param string, r *http.Request) (bool, error) {
+	user, err := iu.Dependencies.Auth.UserOf(r)
+	return user != nil, err
+}