first commit

pkg/hash/hash.go

@@ -0,0 +1,25 @@
+package hash
+
+var _ Hash = (*hash)(nil)
+
+type Hash interface {
+	i()
+
+	// hashids
+	HashidsEncode(params []int) (string, error)
+	HashidsDecode(hash string) ([]int, error)
+}
+
+type hash struct {
+	secret string
+	length int
+}
+
+func New(secret string, length int) Hash {
+	return &hash{
+		secret: secret,
+		length: length,
+	}
+}
+
+func (h *hash) i() {}

pkg/hash/hash_hashids.go

@@ -0,0 +1,41 @@
+package hash
+
+import (
+	"github.com/speps/go-hashids"
+)
+
+func (h *hash) HashidsEncode(params []int) (string, error) {
+	hd := hashids.NewData()
+	hd.Salt = h.secret
+	hd.MinLength = h.length
+
+	hashID, err := hashids.NewWithData(hd)
+	if err != nil {
+		return "", err
+	}
+
+	hashStr, err := hashID.Encode(params)
+	if err != nil {
+		return "", err
+	}
+
+	return hashStr, nil
+}
+
+func (h *hash) HashidsDecode(hash string) ([]int, error) {
+	hd := hashids.NewData()
+	hd.Salt = h.secret
+	hd.MinLength = h.length
+
+	hashID, err := hashids.NewWithData(hd)
+	if err != nil {
+		return nil, err
+	}
+
+	ids, err := hashID.DecodeWithError(hash)
+	if err != nil {
+		return nil, err
+	}
+
+	return ids, nil
+}