Remove code duplication in x/auth/client/cli

Commands decode-tx and decode were performing the same function.
The command decode-tx is now dropped and replaced by decode.

Closes: #5424

CHANGELOG.md

@@ -88,6 +88,7 @@ if the provided arguments are invalid.
 increased significantly due to modular `AnteHandler` support. Increase GasLimit accordingly.
 * (rest) [\#5336](https://github.com/cosmos/cosmos-sdk/issues/5336) `MsgEditValidator` uses `description` instead of `Description` as a JSON key.
 * (keys) [\#5097](https://github.com/cosmos/cosmos-sdk/pull/5097) Due to the keybase -> keyring transition, keys need to be migrated. See `keys migrate` command for more info.
+* (x/auth) [\#5424](https://github.com/cosmos/cosmos-sdk/issues/5424) Drop `decode-tx` command from x/auth/client/cli, duplicate of the `decode` command.
 
 ### Features
 

x/auth/client/cli/decode.go

@@ -1,98 +1,56 @@
 package cli
 
 import (
-	"bytes"
 	"encoding/base64"
 	"encoding/hex"
-	"encoding/json"
-	"fmt"
 
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 	"github.com/tendermint/go-amino"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/context"
-	"github.com/cosmos/cosmos-sdk/codec"
-	"github.com/cosmos/cosmos-sdk/version"
-	"github.com/cosmos/cosmos-sdk/x/auth/types"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
 )
 
+const flagHex = "hex"
+
 // GetDecodeCommand returns the decode command to take Amino-serialized bytes
 // and turn it into a JSONified transaction.
 func GetDecodeCommand(codec *amino.Codec) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "decode [amino-byte-string]",
-		Short: "Decode an amino-encoded transaction string",
+		Short: "Decode an amino-encoded transaction string.",
 		Args:  cobra.ExactArgs(1),
-		RunE: func(cmd *cobra.Command, args []string) (err error) {
-			cliCtx := context.NewCLIContext().WithCodec(codec)
-
-			txBytes, err := base64.StdEncoding.DecodeString(args[0])
-			if err != nil {
-				return err
-			}
-
-			var stdTx authtypes.StdTx
-			err = cliCtx.Codec.UnmarshalBinaryLengthPrefixed(txBytes, &stdTx)
-			if err != nil {
-				return err
-			}
-
-			return cliCtx.PrintOutput(stdTx)
-		},
+		RunE:  runDecodeTxString(codec),
 	}
 
+	cmd.Flags().BoolP(flagHex, "x", false, "Treat input as hexadecimal instead of base64")
 	return client.PostCommands(cmd)[0]
 }
 
-// GetDecodeTxCmd - returns the command to decode a tx from hex or base64
-func GetDecodeTxCmd(cdc *codec.Codec) *cobra.Command {
-	return &cobra.Command{
-		Use:   "decode-tx [tx]",
-		Short: "Decode a tx from hex or base64",
-		Long: fmt.Sprintf(`Decode a tx from hex, base64.
-			
-Example:
-	$ %s tx decode-tx TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz
-			`, version.ClientName),
-		Args: cobra.ExactArgs(1),
-		RunE: func(cmd *cobra.Command, args []string) error {
-
-			txString := args[0]
-
-			// try hex, then base64
-			txBytes, err := hex.DecodeString(txString)
-			if err != nil {
-				var err2 error
-				txBytes, err2 = base64.StdEncoding.DecodeString(txString)
-				if err2 != nil {
-					return fmt.Errorf(`expected hex or base64. Got errors:
-				hex: %v,
-				base64: %v
-				`, err, err2)
-				}
-			}
-
-			var tx = types.StdTx{}
-
-			err = cdc.UnmarshalBinaryLengthPrefixed(txBytes, &tx)
-			if err != nil {
-				return err
-			}
-
-			bz, err := cdc.MarshalJSON(tx)
-			if err != nil {
-				return err
-			}
-
-			buf := bytes.NewBuffer([]byte{})
-			if err = json.Indent(buf, bz, "", "  "); err != nil {
-				return err
-			}
-
-			fmt.Println(buf.String())
-			return nil
-		},
+func runDecodeTxString(codec *amino.Codec) func(cmd *cobra.Command, args []string) (err error) {
+	return func(cmd *cobra.Command, args []string) (err error) {
+		cmd.SetOut(cmd.OutOrStdout())
+		cmd.SetErr(cmd.ErrOrStderr())
+		cliCtx := context.NewCLIContext().WithCodec(codec).WithOutput(cmd.OutOrStdout())
+		var txBytes []byte
+
+		if viper.GetBool(flagHex) {
+			txBytes, err = hex.DecodeString(args[0])
+		} else {
+			txBytes, err = base64.StdEncoding.DecodeString(args[0])
+		}
+		if err != nil {
+			return err
+		}
+
+		var stdTx authtypes.StdTx
+		err = cliCtx.Codec.UnmarshalBinaryLengthPrefixed(txBytes, &stdTx)
+		if err != nil {
+			return err
+		}
+
+		return cliCtx.PrintOutput(stdTx)
 	}
 }