Resolves #1864. Adds Native List as an option for configuring keys.

config/config.go

@@ -170,23 +170,86 @@ type destinationRule struct {
 }
 
 type creationRule struct {
-	PathRegex               string `yaml:"path_regex"`
-	KMS                     string
-	AwsProfile              string `yaml:"aws_profile"`
-	Age                     string `yaml:"age"`
-	PGP                     string
-	GCPKMS                  string     `yaml:"gcp_kms"`
-	AzureKeyVault           string     `yaml:"azure_keyvault"`
-	VaultURI                string     `yaml:"hc_vault_transit_uri"`
-	KeyGroups               []keyGroup `yaml:"key_groups"`
-	ShamirThreshold         int        `yaml:"shamir_threshold"`
-	UnencryptedSuffix       string     `yaml:"unencrypted_suffix"`
-	EncryptedSuffix         string     `yaml:"encrypted_suffix"`
-	UnencryptedRegex        string     `yaml:"unencrypted_regex"`
-	EncryptedRegex          string     `yaml:"encrypted_regex"`
-	UnencryptedCommentRegex string     `yaml:"unencrypted_comment_regex"`
-	EncryptedCommentRegex   string     `yaml:"encrypted_comment_regex"`
-	MACOnlyEncrypted        bool       `yaml:"mac_only_encrypted"`
+	PathRegex               string      `yaml:"path_regex"`
+	KMS                     interface{} `yaml:"kms"` // string or []string
+	AwsProfile              string      `yaml:"aws_profile"`
+	Age                     interface{} `yaml:"age"`                  // string or []string
+	PGP                     interface{} `yaml:"pgp"`                  // string or []string
+	GCPKMS                  interface{} `yaml:"gcp_kms"`              // string or []string
+	AzureKeyVault           interface{} `yaml:"azure_keyvault"`       // string or []string
+	VaultURI                interface{} `yaml:"hc_vault_transit_uri"` // string or []string
+	KeyGroups               []keyGroup  `yaml:"key_groups"`
+	ShamirThreshold         int         `yaml:"shamir_threshold"`
+	UnencryptedSuffix       string      `yaml:"unencrypted_suffix"`
+	EncryptedSuffix         string      `yaml:"encrypted_suffix"`
+	UnencryptedRegex        string      `yaml:"unencrypted_regex"`
+	EncryptedRegex          string      `yaml:"encrypted_regex"`
+	UnencryptedCommentRegex string      `yaml:"unencrypted_comment_regex"`
+	EncryptedCommentRegex   string      `yaml:"encrypted_comment_regex"`
+	MACOnlyEncrypted        bool        `yaml:"mac_only_encrypted"`
+}
+
+// Helper methods to safely extract keys as []string
+func (c *creationRule) GetKMSKeys() ([]string, error) {
+	return parseKeyField(c.KMS, "kms")
+}
+
+func (c *creationRule) GetAgeKeys() ([]string, error) {
+	return parseKeyField(c.Age, "age")
+}
+
+func (c *creationRule) GetPGPKeys() ([]string, error) {
+	return parseKeyField(c.PGP, "pgp")
+}
+
+func (c *creationRule) GetGCPKMSKeys() ([]string, error) {
+	return parseKeyField(c.GCPKMS, "gcp_kms")
+}
+
+func (c *creationRule) GetAzureKeyVaultKeys() ([]string, error) {
+	return parseKeyField(c.AzureKeyVault, "azure_keyvault")
+}
+
+func (c *creationRule) GetVaultURIs() ([]string, error) {
+	return parseKeyField(c.VaultURI, "hc_vault_transit_uri")
+}
+
+// Utility function to handle both string and []string
+func parseKeyField(field interface{}, fieldName string) ([]string, error) {
+	if field == nil {
+		return []string{}, nil
+	}
+
+	switch v := field.(type) {
+	case string:
+		if v == "" {
+			return []string{}, nil
+		}
+		// Existing CSV parsing logic
+		keys := strings.Split(v, ",")
+		result := make([]string, 0, len(keys))
+		for _, key := range keys {
+			trimmed := strings.TrimSpace(key)
+			if trimmed != "" { // Skip empty strings (fixes trailing comma issue)
+				result = append(result, trimmed)
+			}
+		}
+		return result, nil
+	case []interface{}:
+		result := make([]string, len(v))
+		for i, item := range v {
+			if str, ok := item.(string); ok {
+				result[i] = str
+			} else {
+				return nil, fmt.Errorf("invalid %s key configuration: expected string in list, got %T", fieldName, item)
+			}
+		}
+		return result, nil
+	case []string:
+		return v, nil
+	default:
+		return nil, fmt.Errorf("invalid %s key configuration: expected string, []string, or nil, got %T", fieldName, field)
+	}
 }
 
 func NewStoresConfig() *StoresConfig {
@@ -279,6 +342,14 @@ func extractMasterKeys(group keyGroup) (sops.KeyGroup, error) {
 	return deduplicateKeygroup(keyGroup), nil
 }
 
+func getKeysWithValidation(getKeysFunc func() ([]string, error), keyType string) ([]string, error) {
+	keys, err := getKeysFunc()
+	if err != nil {
+		return nil, fmt.Errorf("invalid %s key configuration: %w", keyType, err)
+	}
+	return keys, nil
+}
+
 func getKeyGroupsFromCreationRule(cRule *creationRule, kmsEncryptionContext map[string]*string) ([]sops.KeyGroup, error) {
 	var groups []sops.KeyGroup
 	if len(cRule.KeyGroups) > 0 {
@@ -291,8 +362,13 @@ func getKeyGroupsFromCreationRule(cRule *creationRule, kmsEncryptionContext map[
 		}
 	} else {
 		var keyGroup sops.KeyGroup
-		if cRule.Age != "" {
-			ageKeys, err := age.MasterKeysFromRecipients(cRule.Age)
+		ageKeys, err := getKeysWithValidation(cRule.GetAgeKeys, "age")
+		if err != nil {
+			return nil, err
+		}
+
+		if len(ageKeys) > 0 {
+			ageKeys, err := age.MasterKeysFromRecipients(strings.Join(ageKeys, ","))
 			if err != nil {
 				return nil, err
 			} else {
@@ -301,23 +377,43 @@ func getKeyGroupsFromCreationRule(cRule *creationRule, kmsEncryptionContext map[
 				}
 			}
 		}
-		for _, k := range pgp.MasterKeysFromFingerprintString(cRule.PGP) {
+		pgpKeys, err := getKeysWithValidation(cRule.GetPGPKeys, "pgp")
+		if err != nil {
+			return nil, err
+		}
+		for _, k := range pgp.MasterKeysFromFingerprintString(strings.Join(pgpKeys, ",")) {
 			keyGroup = append(keyGroup, k)
 		}
-		for _, k := range kms.MasterKeysFromArnString(cRule.KMS, kmsEncryptionContext, cRule.AwsProfile) {
+		kmsKeys, err := getKeysWithValidation(cRule.GetKMSKeys, "kms")
+		if err != nil {
+			return nil, err
+		}
+		for _, k := range kms.MasterKeysFromArnString(strings.Join(kmsKeys, ","), kmsEncryptionContext, cRule.AwsProfile) {
 			keyGroup = append(keyGroup, k)
 		}
-		for _, k := range gcpkms.MasterKeysFromResourceIDString(cRule.GCPKMS) {
+		gcpkmsKeys, err := getKeysWithValidation(cRule.GetGCPKMSKeys, "gcpkms")
+		if err != nil {
+			return nil, err
+		}
+		for _, k := range gcpkms.MasterKeysFromResourceIDString(strings.Join(gcpkmsKeys, ",")) {
 			keyGroup = append(keyGroup, k)
 		}
-		azureKeys, err := azkv.MasterKeysFromURLs(cRule.AzureKeyVault)
+		azKeys, err := getKeysWithValidation(cRule.GetAzureKeyVaultKeys, "azure_keyvault")
+		if err != nil {
+			return nil, err
+		}
+		azureKeys, err := azkv.MasterKeysFromURLs(strings.Join(azKeys, ","))
 		if err != nil {
 			return nil, err
 		}
 		for _, k := range azureKeys {
 			keyGroup = append(keyGroup, k)
 		}
-		vaultKeys, err := hcvault.NewMasterKeysFromURIs(cRule.VaultURI)
+		vaultKeyUris, err := getKeysWithValidation(cRule.GetVaultURIs, "vault")
+		if err != nil {
+			return nil, err
+		}
+		vaultKeys, err := hcvault.NewMasterKeysFromURIs(strings.Join(vaultKeyUris, ","))
 		if err != nil {
 			return nil, err
 		}

config/config_test.go

@@ -718,3 +718,40 @@ func TestLoadConfigFileWithVaultDestinationRules(t *testing.T) {
 	assert.NotNil(t, conf.Destination)
 	assert.Contains(t, conf.Destination.Path("barfoo"), "/v1/kv/barfoo/barfoo")
 }
+
+func TestCreationRuleNativeKeyLists(t *testing.T) {
+	var sampleConfigWithNativeKeyLists = []byte(`
+creation_rules:
+  - path_regex: native_list*
+    pgp:
+      - "85D77543B3D624B63CEA9E6DBC17301B491B3F21"  # [email protected]
+      - "FBC7B9E2A4F9289AC0C1D4843D16CEE4A27381B4"  # server_XYZ
+    kms:
+      - "arn:aws:kms:us-east-1:123456789012:key/12345678-1234-1234-1234-123456789012"
+    age:
+      - "age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p"
+    gcp_kms:
+      - "projects/test-project/locations/global/keyRings/test-ring/cryptoKeys/test-key"
+    hc_vault_transit_uri:
+      - "https://vault.example.com:8200/v1/transit/keys/key1"
+`)
+	conf, err := parseCreationRuleForFile(parseConfigFile(sampleConfigWithNativeKeyLists, t), "/conf/path", "native_list_test", nil)
+	assert.Nil(t, err)
+	if conf == nil {
+		t.Fatal("Expected configuration but got nil")
+	}
+
+	assert.True(t, len(conf.KeyGroups) == 1)
+	assert.True(t, len(conf.KeyGroups[0]) == 6)
+
+	keyTypeCounts := make(map[string]int)
+	for _, key := range conf.KeyGroups[0] {
+		keyTypeCounts[key.TypeToIdentifier()]++
+	}
+
+	assert.Equal(t, 2, keyTypeCounts["pgp"])
+	assert.Equal(t, 1, keyTypeCounts["kms"])
+	assert.Equal(t, 1, keyTypeCounts["age"])
+	assert.Equal(t, 1, keyTypeCounts["gcp_kms"])
+	assert.Equal(t, 1, keyTypeCounts["hc_vault"])
+}