update error messages

internal/conf/authmethod.go

@@ -43,7 +43,7 @@ func (d *AuthMethods) UnmarshalJSON(b []byte) error {
 			*d = append(*d, headers.AuthDigest)
 
 		default:
-			return fmt.Errorf("unsupported authentication method: %s", in)
+			return fmt.Errorf("invalid authentication method: %s", in)
 		}
 	}
 

internal/conf/encryption.go

@@ -51,7 +51,7 @@ func (d *Encryption) UnmarshalJSON(b []byte) error {
 		*d = EncryptionStrict
 
 	default:
-		return fmt.Errorf("unsupported encryption value: '%s'", in)
+		return fmt.Errorf("invalid encryption value: '%s'", in)
 	}
 
 	return nil

internal/conf/logdestination.go

@@ -57,7 +57,7 @@ func (d *LogDestinations) UnmarshalJSON(b []byte) error {
 			(*d)[logger.DestinationSyslog] = struct{}{}
 
 		default:
-			return fmt.Errorf("unsupported log destination: %s", proto)
+			return fmt.Errorf("invalid log destination: %s", proto)
 		}
 	}
 

internal/conf/loglevel.go

@@ -46,7 +46,7 @@ func (d *LogLevel) UnmarshalJSON(b []byte) error {
 		*d = LogLevel(logger.Debug)
 
 	default:
-		return fmt.Errorf("unsupported log level: %s", in)
+		return fmt.Errorf("invalid log level: %s", in)
 	}
 
 	return nil

internal/conf/protocol.go

@@ -63,7 +63,7 @@ func (d *Protocols) UnmarshalJSON(b []byte) error {
 			(*d)[ProtocolTCP] = struct{}{}
 
 		default:
-			return fmt.Errorf("unsupported protocol: %s", proto)
+			return fmt.Errorf("invalid protocol: %s", proto)
 		}
 	}
 

internal/conf/sourceprotocol.go

@@ -57,7 +57,7 @@ func (d *SourceProtocol) UnmarshalJSON(b []byte) error {
 	case "automatic":
 
 	default:
-		return fmt.Errorf("unsupported protocol '%s'", in)
+		return fmt.Errorf("invalid protocol '%s'", in)
 	}
 
 	return nil