feat: Implement basic overwriting, in-memory File.Write

cmd/stfs/cmd/operation_update.go

@@ -146,6 +146,7 @@ var operationUpdateCmd = &cobra.Command{
 			},
 			viper.GetString(compressionLevelFlag),
 			viper.GetBool(overwriteFlag),
+			false,
 		); err != nil {
 			return err
 		}

cmd/stfs/cmd/serve_ftp.go

@@ -85,12 +85,12 @@ var serveFTPCmd = &cobra.Command{
 			return err
 		}
 
-		signatureIdentity, err := keys.ParseIdentity(viper.GetString(signatureFlag), signaturePrivkey, viper.GetString(signaturePasswordFlag))
+		signatureIdentity, err := keys.ParseSignerIdentity(viper.GetString(signatureFlag), signaturePrivkey, viper.GetString(signaturePasswordFlag))
 		if err != nil {
 			return err
 		}
 
-		encryptionRecipient, err := keys.ParseSignerRecipient(viper.GetString(encryptionFlag), encryptionPubkey)
+		encryptionRecipient, err := keys.ParseRecipient(viper.GetString(encryptionFlag), encryptionPubkey)
 		if err != nil {
 			return err
 		}