add KMS support

Fixes #226

kms/basesecret.go

@@ -0,0 +1,53 @@
+package kms
+
+// baseSecret defines the base struct shared among all the secret providers
+type baseSecret struct {
+	Status         SecretStatus `json:"status,omitempty"`
+	Payload        string       `json:"payload,omitempty"`
+	Key            string       `json:"key,omitempty"`
+	AdditionalData string       `json:"additional_data,omitempty"`
+}
+
+func (s *baseSecret) GetStatus() SecretStatus {
+	return s.Status
+}
+
+func (s *baseSecret) GetPayload() string {
+	return s.Payload
+}
+
+func (s *baseSecret) GetKey() string {
+	return s.Key
+}
+
+func (s *baseSecret) GetAdditionalData() string {
+	return s.AdditionalData
+}
+
+func (s *baseSecret) SetKey(value string) {
+	s.Key = value
+}
+
+func (s *baseSecret) SetAdditionalData(value string) {
+	s.AdditionalData = value
+}
+
+func (s *baseSecret) SetStatus(value SecretStatus) {
+	s.Status = value
+}
+
+func (s *baseSecret) isEmpty() bool {
+	if s.Status != "" {
+		return false
+	}
+	if s.Payload != "" {
+		return false
+	}
+	if s.Key != "" {
+		return false
+	}
+	if s.AdditionalData != "" {
+		return false
+	}
+	return true
+}