fix(configuration): replace string literals with constants

Signed-off-by: vitshev <vitshev@tracto.ai>

configuration/configuration.go

@@ -904,6 +904,13 @@ func setFieldValue(field reflect.Value, value interface{}) error {
 	return nil
 }
 
+const (
+	ClientAuthRequestClientCert          = "request-client-cert"
+	ClientAuthRequireAnyClientCert       = "require-any-client-cert"
+	ClientAuthVerifyClientCertIfGiven    = "verify-client-cert-if-given"
+	ClientAuthRequireAndVerifyClientCert = "require-and-verify-client-cert"
+)
+
 type ClientAuth string
 
 // UnmarshalYAML implements the yaml.Umarshaler interface
@@ -916,10 +923,10 @@ func (clientAuth *ClientAuth) UnmarshalYAML(unmarshal func(interface{}) error) e
 	}
 
 	switch clientAuthString {
-	case "request-client-cert":
-	case "require-any-client-cert":
-	case "verify-client-cert-if-given":
-	case "require-and-verify-client-cert":
+	case ClientAuthRequestClientCert:
+	case ClientAuthRequireAnyClientCert:
+	case ClientAuthVerifyClientCertIfGiven:
+	case ClientAuthRequireAndVerifyClientCert:
 	default:
 		return fmt.Errorf("invalid ClientAuth %s Must be one of: request-client-cert, require-any-client-cert, verify-client-cert-if-given, require-and-verify-client-cert", clientAuthString)
 	}

registry/registry.go

@@ -81,10 +81,10 @@ var tlsVersions = map[string]uint16{
 
 // tlsClientAuth maps user-specified values to TLS Client Authentication constants.
 var tlsClientAuth = map[string]tls.ClientAuthType{
-	"request-client-cert":            tls.RequestClientCert,
-	"require-any-client-cert":        tls.RequireAnyClientCert,
-	"verify-client-cert-if-given":    tls.VerifyClientCertIfGiven,
-	"require-and-verify-client-cert": tls.RequireAndVerifyClientCert,
+	configuration.ClientAuthRequestClientCert:          tls.RequestClientCert,
+	configuration.ClientAuthRequireAnyClientCert:       tls.RequireAnyClientCert,
+	configuration.ClientAuthVerifyClientCertIfGiven:    tls.VerifyClientCertIfGiven,
+	configuration.ClientAuthRequireAndVerifyClientCert: tls.RequireAndVerifyClientCert,
 }
 
 // defaultLogFormatter is the default formatter to use for logs.