feat: add administration domain core

backend/internal/administration/password.go

@@ -0,0 +1,29 @@
+package administration
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"golang.org/x/crypto/scrypt"
+	"regexp"
+	"strings"
+)
+
+var phonePattern = regexp.MustCompile(`^\+?[0-9]{6,20}$`)
+
+func NormalizePhone(value string) string {
+	r := strings.NewReplacer(" ", "", "\t", "", "\n", "", "\r", "", "(", "", ")", "", "-", "")
+	return r.Replace(strings.TrimSpace(value))
+}
+func ValidPhone(value string) bool { return phonePattern.MatchString(NormalizePhone(value)) }
+func HashPassword(password string) (PasswordHash, error) {
+	salt := make([]byte, 16)
+	if _, err := rand.Read(salt); err != nil {
+		return PasswordHash{}, err
+	}
+	encoded := hex.EncodeToString(salt)
+	derived, err := scrypt.Key([]byte(password), []byte(encoded), 16384, 8, 1, 64)
+	if err != nil {
+		return PasswordHash{}, err
+	}
+	return PasswordHash{Hash: hex.EncodeToString(derived), Salt: encoded}, nil
+}