[#466] cli: support NEP-2 and NEP-6 key formats

NEP-2 is contains WIF encrypted with password.
NEP-6 is format used for neo-go wallets.

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

cmd/neofs-cli/modules/accounting.go

@@ -34,17 +34,17 @@ var accountingBalanceCmd = &cobra.Command{
 			ctx = context.Background()
 		)
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
 
 		if balanceOwner == "" {
-			key, err := getKey()
-			if err != nil {
-				return err
-			}
-
 			wallet, err := owner.NEO3WalletFromPublicKey(&key.PublicKey)
 			if err != nil {
 				return err

cmd/neofs-cli/modules/container.go

@@ -73,17 +73,17 @@ var listContainersCmd = &cobra.Command{
 			ctx = context.Background()
 		)
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
 
 		if containerOwner == "" {
-			key, err := getKey()
-			if err != nil {
-				return err
-			}
-
 			wallet, err := owner.NEO3WalletFromPublicKey(&key.PublicKey)
 			if err != nil {
 				return err
@@ -117,7 +117,12 @@ It will be stored in sidechain when inner ring will accepts it.`,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -183,7 +188,12 @@ Only owner of the container has a permission to remove container.`,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -227,7 +237,12 @@ var listContainerObjectsCmd = &cobra.Command{
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -288,7 +303,12 @@ var getContainerInfoCmd = &cobra.Command{
 				return errors.Wrap(err, "can't unmarshal container")
 			}
 		} else {
-			cli, err := getSDKClient()
+			key, err := getKey()
+			if err != nil {
+				return err
+			}
+
+			cli, err := getSDKClient(key)
 			if err != nil {
 				return err
 			}
@@ -341,7 +361,12 @@ var getExtendedACLCmd = &cobra.Command{
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -400,7 +425,12 @@ Container ID in EACL table will be substituted with ID from the CLI.`,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
 
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}

cmd/neofs-cli/modules/control.go

@@ -78,7 +78,7 @@ func healthCheck(cmd *cobra.Command, _ []string) error {
 		return err
 	}
 
-	cli, err := getSDKClient()
+	cli, err := getSDKClient(key)
 	if err != nil {
 		return err
 	}
@@ -130,7 +130,7 @@ func setNetmapStatus(cmd *cobra.Command, _ []string) error {
 		return err
 	}
 
-	cli, err := getSDKClient()
+	cli, err := getSDKClient(key)
 	if err != nil {
 		return err
 	}
@@ -196,7 +196,7 @@ var dropObjectsCmd = &cobra.Command{
 			return err
 		}
 
-		cli, err := getSDKClient()
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}

cmd/neofs-cli/modules/netmap.go

@@ -51,7 +51,12 @@ var getEpochCmd = &cobra.Command{
 	Short: "Get current epoch number",
 	Long:  "Get current epoch number",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -72,7 +77,12 @@ var localNodeInfoCmd = &cobra.Command{
 	Short: "Get local node info",
 	Long:  `Get local node info`,
 	RunE: func(cmd *cobra.Command, args []string) error {
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -105,7 +115,7 @@ var snapshotCmd = &cobra.Command{
 			return err
 		}
 
-		cli, err := getSDKClient()
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}
@@ -134,7 +144,12 @@ var netInfoCmd = &cobra.Command{
 	Short: "Get information about NeoFS network",
 	Long:  "Get information about NeoFS network",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		cli, err := getSDKClient()
+		key, err := getKey()
+		if err != nil {
+			return err
+		}
+
+		cli, err := getSDKClient(key)
 		if err != nil {
 			return err
 		}

cmd/neofs-cli/modules/object.go

@@ -194,7 +194,11 @@ func init() {
 }
 
 func initSession(ctx context.Context) (client.Client, *token.SessionToken, error) {
-	cli, err := getSDKClient()
+	key, err := getKey()
+	if err != nil {
+		return nil, nil, fmt.Errorf("can't fetch private key: %w", err)
+	}
+	cli, err := getSDKClient(key)
 	if err != nil {
 		return nil, nil, fmt.Errorf("can't create client: %w", err)
 	}

cmd/neofs-cli/modules/root.go

@@ -10,6 +10,10 @@ import (
 	"strings"
 
 	"github.com/mitchellh/go-homedir"
+	"github.com/nspcc-dev/neo-go/cli/flags"
+	"github.com/nspcc-dev/neo-go/cli/input"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/wallet"
 	"github.com/nspcc-dev/neofs-api-go/pkg"
 	"github.com/nspcc-dev/neofs-api-go/pkg/client"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
@@ -53,6 +57,8 @@ var (
 	errInvalidKey      = errors.New("provided key is incorrect")
 	errInvalidEndpoint = errors.New("provided RPC endpoint is incorrect")
 	errCantGenerateKey = errors.New("can't generate new private key")
+	errInvalidAddress  = errors.New("--address option must be specified and valid")
+	errInvalidPassword = errors.New("invalid password for the encrypted key")
 )
 
 // Execute adds all child commands to the root command and sets flags appropriately.
@@ -75,9 +81,12 @@ func init() {
 
 	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file (default is $HOME/.config/neofs-cli/config.yaml)")
 
-	rootCmd.PersistentFlags().StringP("key", "k", "", "private key in hex, WIF or filepath (use `--key new` to generate key for request)")
+	rootCmd.PersistentFlags().StringP("key", "k", "", "private key in hex, WIF, NEP-2 or filepath (use `--key new` to generate key for request)")
 	_ = viper.BindPFlag("key", rootCmd.PersistentFlags().Lookup("key"))
 
+	rootCmd.PersistentFlags().StringP("address", "", "", "address of wallet account")
+	_ = viper.BindPFlag("address", rootCmd.PersistentFlags().Lookup("address"))
+
 	rootCmd.PersistentFlags().StringP("rpc-endpoint", "r", "", "remote node address (as 'multiaddr' or '<host>:<port>')")
 	_ = viper.BindPFlag("rpc", rootCmd.PersistentFlags().Lookup("rpc-endpoint"))
 
@@ -122,6 +131,8 @@ func initConfig() {
 	}
 }
 
+const nep2Base58Length = 58
+
 // getKey returns private key that was provided in global arguments.
 func getKey() (*ecdsa.PrivateKey, error) {
 	privateKey := viper.GetString("key")
@@ -139,11 +150,68 @@ func getKey() (*ecdsa.PrivateKey, error) {
 	}
 
 	key, err := crypto.LoadPrivateKey(privateKey)
-	if err != nil {
-		return nil, errInvalidKey
+	if err == nil {
+		return key, nil
 	}
 
-	return key, nil
+	w, err := wallet.NewWalletFromFile(privateKey)
+	if err == nil {
+		return getKeyFromWallet(w, viper.GetString("address"))
+	}
+
+	if len(privateKey) == nep2Base58Length {
+		return getKeyFromNEP2(privateKey)
+	}
+
+	return nil, errInvalidKey
+}
+
+func getKeyFromNEP2(encryptedWif string) (*ecdsa.PrivateKey, error) {
+	pass, err := input.ReadPassword("Enter password > ")
+	if err != nil {
+		printVerbose("Can't read password: %v", err)
+		return nil, errInvalidPassword
+	}
+
+	k, err := keys.NEP2Decrypt(encryptedWif, pass)
+	if err != nil {
+		printVerbose("Invalid key or password: %v", err)
+		return nil, errInvalidPassword
+	}
+
+	return &k.PrivateKey, nil
+}
+
+func getKeyFromWallet(w *wallet.Wallet, addrStr string) (*ecdsa.PrivateKey, error) {
+	if addrStr == "" {
+		printVerbose("Address is empty")
+		return nil, errInvalidAddress
+	}
+
+	addr, err := flags.ParseAddress(addrStr)
+	if err != nil {
+		printVerbose("Can't parse address: %s", addrStr)
+		return nil, errInvalidAddress
+	}
+
+	acc := w.GetAccount(addr)
+	if acc == nil {
+		printVerbose("Can't find wallet account for %s", addrStr)
+		return nil, errInvalidAddress
+	}
+
+	pass, err := input.ReadPassword("Enter password > ")
+	if err != nil {
+		printVerbose("Can't read password: %v", err)
+		return nil, errInvalidPassword
+	}
+
+	if err := acc.Decrypt(pass); err != nil {
+		printVerbose("Can't decrypt account: %v", err)
+		return nil, errInvalidPassword
+	}
+
+	return &acc.PrivateKey().PrivateKey, nil
 }
 
 // getEndpointAddress returns network address structure that stores multiaddr
@@ -161,12 +229,7 @@ func getEndpointAddress() (*network.Address, error) {
 
 // getSDKClient returns default neofs-api-go sdk client. Consider using
 // opts... to provide TTL or other global configuration flags.
-func getSDKClient() (client.Client, error) {
-	key, err := getKey()
-	if err != nil {
-		return nil, err
-	}
-
+func getSDKClient(key *ecdsa.PrivateKey) (client.Client, error) {
 	netAddr, err := getEndpointAddress()
 	if err != nil {
 		return nil, err
@@ -177,7 +240,8 @@ func getSDKClient() (client.Client, error) {
 		return nil, errInvalidEndpoint
 	}
 
-	return client.New(client.WithAddress(ipAddr), client.WithDefaultPrivateKey(key))
+	c, err := client.New(client.WithAddress(ipAddr), client.WithDefaultPrivateKey(key))
+	return c, err
 }
 
 func getTTL() uint32 {