reorganize code

core/model/nkode_policy.go

@@ -0,0 +1,21 @@
+package model
+
+type NKodePolicy struct {
+	MaxNkodeLen        int `json:"max_nkode_len"`
+	MinNkodeLen        int `json:"min_nkode_len"`
+	DistinctSets       int `json:"distinct_sets"`
+	DistinctAttributes int `json:"distinct_attributes"`
+	LockOut            int `json:"lock_out"`
+	Expiration         int `json:"expiration"` // seconds, -1 no expiration
+}
+
+func NewDefaultNKodePolicy() NKodePolicy {
+	return NKodePolicy{
+		MinNkodeLen:        4,
+		MaxNkodeLen:        10,
+		DistinctSets:       0,
+		DistinctAttributes: 4,
+		LockOut:            5,
+		Expiration:         -1,
+	}
+}