feat: allow or block an ip/range of ips using labels (#211)

* feat: allow or block an ip/range of ips using labels

* refactor: redirect to root page when no username or ip is provided in the unauthorized page

internal/types/api.go

@@ -21,6 +21,7 @@ type UnauthorizedQuery struct {
 	Username string `url:"username"`
 	Resource string `url:"resource"`
 	GroupErr bool   `url:"groupErr"`
+	IP       string `url:"ip"`
 }
 
 // Proxy is the uri parameters for the proxy endpoint