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

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

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

@@ -0,0 +1,53 @@
+package util
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/common"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/commonflags"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/key"
+	"github.com/spf13/cobra"
+)
+
+var signSessionCmd = &cobra.Command{
+	Use:   "session-token",
+	Short: "Sign session token to use it in requests",
+	Run:   signSessionToken,
+}
+
+func initSignSessionCmd() {
+	commonflags.InitWithoutRPC(signSessionCmd)
+
+	flags := signSessionCmd.Flags()
+
+	flags.String(signFromFlag, "", "File with JSON encoded session token to sign")
+	_ = signSessionCmd.MarkFlagFilename(signFromFlag)
+	_ = signSessionCmd.MarkFlagRequired(signFromFlag)
+
+	flags.String(signToFlag, "", "File to save signed session token (optional)")
+}
+
+func signSessionToken(cmd *cobra.Command, _ []string) {
+	stok := common.ReadSessionToken(cmd, signFromFlag)
+	pk := key.GetOrGenerate(cmd)
+
+	err := stok.Sign(pk)
+	common.ExitOnErr(cmd, "can't sign token: %w", err)
+
+	data, err := stok.MarshalJSON()
+	common.ExitOnErr(cmd, "can't encode session token: %w", err)
+
+	to := cmd.Flag(signToFlag).Value.String()
+	if len(to) == 0 {
+		prettyPrintJSON(cmd, data)
+		return
+	}
+
+	err = os.WriteFile(to, data, 0644)
+	if err != nil {
+		common.ExitOnErr(cmd, "", fmt.Errorf("can't write signed session token to %s: %w", to, err))
+	}
+
+	cmd.Printf("signed session token saved in %s\n", to)
+}