chore: fix some validation issues

internal/server/service/keyservice.go

@@ -23,6 +23,20 @@ func NewKeyService(db *gorm.DB) *KeyService {
 	}
 }
 
+func (s *KeyService) ListValidKeyHashes() ([]string, error) {
+	keyRecords, err := database.ListKeys(s.db)
+	if err != nil {
+		return nil, err
+	}
+
+	hashList := make([]string, 0, len(keyRecords))
+	for _, k := range keyRecords {
+		hashList = append(hashList, k.KeyHash)
+	}
+
+	return hashList, nil
+}
+
 func (s *KeyService) Create(name string, expiresAt time.Time) (assets.KeyResponse, error) {
 	keyContent := security.GenerateChars(accessKeyLen)