chore: initial commit

internal/pkg/validator/null_int32.go

@@ -0,0 +1,28 @@
+package validator
+
+import "encoding/json"
+
+// NullInt32 Valid(false) + Set(true) = null | Valid(false) + Set(false) = nil
+type NullInt32 struct {
+	Value int32
+	Valid bool
+	Set   bool
+}
+
+func (i *NullInt32) UnmarshalJSON(data []byte) error {
+	i.Set = true
+
+	if string(data) == "null" {
+		i.Valid = false
+		return nil
+	}
+
+	var temp int32
+	if err := json.Unmarshal(data, &temp); err != nil {
+		return err
+	}
+
+	i.Value = temp
+	i.Valid = true
+	return nil
+}