refactor: token cache logic

common/crypto.go

@@ -1,6 +1,23 @@
 package common
 
-import "golang.org/x/crypto/bcrypt"
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"golang.org/x/crypto/bcrypt"
+)
+
+func GenerateHMACWithKey(key []byte, data string) string {
+	h := hmac.New(sha256.New, key)
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func GenerateHMAC(data string) string {
+	h := hmac.New(sha256.New, []byte(SessionSecret))
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
 
 func Password2Hash(password string) (string, error) {
 	passwordBytes := []byte(password)