feat(paginate): add package

paginate/paginate.go

@@ -0,0 +1,37 @@
+package paginate
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// DecodeToken decodes the token string into create_time and UUID
+func DecodeToken(encodedToken string) (time.Time, string, error) {
+	byt, err := base64.StdEncoding.DecodeString(encodedToken)
+	if err != nil {
+		return time.Time{}, "", err
+	}
+
+	arrStr := strings.Split(string(byt), ",")
+	if len(arrStr) != 2 {
+		err = errors.New("Token is invalid")
+		return time.Time{}, "", err
+	}
+
+	createdAt, err := time.Parse(time.RFC3339Nano, arrStr[0])
+	if err != nil {
+		return time.Time{}, "", err
+	}
+	uuid := arrStr[1]
+
+	return createdAt, uuid, nil
+}
+
+// EncodeToken encodes create_time and UUID into a single string
+func EncodeToken(t time.Time, uuid string) string {
+	key := fmt.Sprintf("%s,%s", t.Format(time.RFC3339Nano), uuid)
+	return base64.StdEncoding.EncodeToString([]byte(key))
+}