[#1437] neofs-cli: Move util command to a separate package

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

cmd/neofs-cli/modules/util/convert_eacl.go

@@ -0,0 +1,64 @@
+package util
+
+import (
+	"bytes"
+	"encoding/json"
+	"os"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/common"
+	"github.com/spf13/cobra"
+)
+
+var convertEACLCmd = &cobra.Command{
+	Use:   "eacl",
+	Short: "Convert representation of extended ACL table",
+	Run:   convertEACLTable,
+}
+
+func initConvertEACLCmd() {
+	flags := convertEACLCmd.Flags()
+
+	flags.String("from", "", "File with JSON or binary encoded extended ACL table")
+	_ = convertEACLCmd.MarkFlagFilename("from")
+	_ = convertEACLCmd.MarkFlagRequired("from")
+
+	flags.String("to", "", "File to dump extended ACL table (default: binary encoded)")
+	flags.Bool("json", false, "Dump extended ACL table in JSON encoding")
+}
+
+func convertEACLTable(cmd *cobra.Command, _ []string) {
+	pathFrom := cmd.Flag("from").Value.String()
+	to := cmd.Flag("to").Value.String()
+	jsonFlag, _ := cmd.Flags().GetBool("json")
+
+	table := common.ReadEACL(cmd, pathFrom)
+
+	var data []byte
+	var err error
+	if jsonFlag || len(to) == 0 {
+		data, err = table.MarshalJSON()
+		common.ExitOnErr(cmd, "can't JSON encode extended ACL table: %w", err)
+	} else {
+		data, err = table.Marshal()
+		common.ExitOnErr(cmd, "can't binary encode extended ACL table: %w", err)
+	}
+
+	if len(to) == 0 {
+		prettyPrintJSON(cmd, data)
+		return
+	}
+
+	err = os.WriteFile(to, data, 0644)
+	common.ExitOnErr(cmd, "can't write exteded ACL table to file: %w", err)
+
+	cmd.Printf("extended ACL table was successfully dumped to %s\n", to)
+}
+
+func prettyPrintJSON(cmd *cobra.Command, data []byte) {
+	buf := new(bytes.Buffer)
+	if err := json.Indent(buf, data, "", "  "); err != nil {
+		common.PrintVerbose("Can't pretty print json: %w", err)
+	}
+
+	cmd.Println(buf)
+}