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Implement command/REST endpoint for offline tx sign off #1953
* Add sign CLI command to sign transactions generated with the --generate-only flag. * Add /sign REST endpoint for Voyager support. Redirect password prompt to STDERR to avoid messing up cli commands output. As a rule of thumb, program's output should always go to STDOUT, whilst errors&diagnostics go to STDERR as per POSIX's philosophy and specs.
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Alessio Treglia
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Sep 5, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package cli | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
|
|
||
| "github.com/spf13/viper" | ||
|
|
||
| "github.com/cosmos/cosmos-sdk/client" | ||
| "github.com/cosmos/cosmos-sdk/client/context" | ||
| "github.com/cosmos/cosmos-sdk/client/keys" | ||
| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| "github.com/cosmos/cosmos-sdk/x/auth" | ||
| authctx "github.com/cosmos/cosmos-sdk/x/auth/client/context" | ||
| "github.com/spf13/cobra" | ||
| amino "github.com/tendermint/go-amino" | ||
| ) | ||
|
|
||
| const ( | ||
| flagOverwriteSigs = "overwrite" | ||
| flagPrintSigs = "print-sigs" | ||
| ) | ||
|
|
||
| // GetSignCommand returns the sign command | ||
| func GetSignCommand(codec *amino.Codec, decoder auth.AccountDecoder) *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "sign <file>", | ||
| Short: "Sign transactions", | ||
| Long: `Sign transactions created with the --generate-only flag. | ||
| Read a transaction from <file>, sign it, and print its JSON encoding.`, | ||
| RunE: makeSignCmd(codec, decoder), | ||
| Args: cobra.ExactArgs(1), | ||
| } | ||
| cmd.Flags().String(client.FlagName, "", "Name of private key with which to sign") | ||
| cmd.Flags().Bool(flagOverwriteSigs, false, "Overwrite the signatures that are already attached to the transaction") | ||
| cmd.Flags().Bool(flagPrintSigs, false, "Print the addresses that must sign the transaction and those who have already signed it, then exit") | ||
| return cmd | ||
| } | ||
|
|
||
| func makeSignCmd(cdc *amino.Codec, decoder auth.AccountDecoder) func(cmd *cobra.Command, args []string) error { | ||
| return func(cmd *cobra.Command, args []string) (err error) { | ||
| stdTx, err := readAndUnmarshalStdTx(cdc, args[0]) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| if viper.GetBool(flagPrintSigs) { | ||
| printSignatures(stdTx) | ||
| return nil | ||
| } | ||
|
|
||
| name := viper.GetString(client.FlagName) | ||
| keybase, err := keys.GetKeyBase() | ||
| if err != nil { | ||
| return | ||
| } | ||
| info, err := keybase.Get(name) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| cliCtx := context.NewCLIContext().WithCodec(cdc).WithAccountDecoder(decoder) | ||
| acc, err := cliCtx.GetAccount(sdk.AccAddress(info.GetPubKey().Address())) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| passphrase, err := keys.GetPassphrase(name) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| newTx, err := signStdTx(stdTx, name, passphrase, acc) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| json, err := cdc.MarshalJSON(newTx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf("%s\n", json) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func signStdTx(stdTx auth.StdTx, name, passphrase string, acc auth.Account) (signedStdTx auth.StdTx, err error) { | ||
| stdSignature, err := authctx.MakeSignature(name, passphrase, auth.StdSignMsg{ | ||
| ChainID: viper.GetString(client.FlagChainID), | ||
| AccountNumber: acc.GetAccountNumber(), | ||
| Sequence: acc.GetSequence(), | ||
| Fee: stdTx.Fee, | ||
| Msgs: stdTx.GetMsgs(), | ||
| Memo: stdTx.GetMemo(), | ||
| }) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| signedStdTx = authctx.SignStdTx(stdTx, stdSignature, viper.GetBool(flagOverwriteSigs)) | ||
| return | ||
| } | ||
|
|
||
| func printSignatures(stdTx auth.StdTx) { | ||
| fmt.Println("Signers:") | ||
| for i, signer := range stdTx.GetSigners() { | ||
| fmt.Printf(" %v: %v\n", i, signer.String()) | ||
| } | ||
| fmt.Println("") | ||
| fmt.Println("Signatures:") | ||
| for i, sig := range stdTx.GetSignatures() { | ||
| fmt.Printf(" %v: %v\n", i, sdk.AccAddress(sig.Address()).String()) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func readAndUnmarshalStdTx(cdc *amino.Codec, filename string) (stdTx auth.StdTx, err error) { | ||
| var bytes []byte | ||
| if bytes, err = ioutil.ReadFile(filename); err != nil { | ||
| return | ||
| } | ||
| if err = cdc.UnmarshalJSON(bytes, &stdTx); err != nil { | ||
| return | ||
| } | ||
| return | ||
| } |
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