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sign.go
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sign.go
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package types
import (
"errors"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/crypto/keyring"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/cosmos/cosmos-sdk/types/tx/signing"
authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing"
)
var (
errNoTxConfig = errors.New("no tx config provided")
errNoKeyringProvided = errors.New("no keyring provided")
)
// SignatureProvider offers an abstraction over private keys
// which can be constructed from raw private keys or keyrings
// it is a subset of the methods exposed by cryptotypes.PrivKey
type SignatureProvider interface {
Sign(msg []byte) (signedBytes []byte, err error)
PubKey() cryptotypes.PubKey
}
// keyringWrapper implements SignatureProvider over a keyring
type keyringWrapper struct {
uid string
pubKey cryptotypes.PubKey
keyring keyring.Keyring
}
func (k keyringWrapper) Sign(msg []byte) (signedBytes []byte, err error) {
signedBytes, _, err = k.keyring.Sign(k.uid, msg)
return
}
func (k keyringWrapper) PubKey() cryptotypes.PubKey {
return k.pubKey
}
func newKeyRingWrapper(uid string, keyring keyring.Keyring) (keyringWrapper, error) {
// assert from name exists
info, err := keyring.Key(uid)
if err != nil {
return keyringWrapper{}, err
}
pubKey, err := info.GetPubKey()
if err != nil {
return keyringWrapper{}, err
}
wrapper := keyringWrapper{uid: uid, pubKey: pubKey, keyring: keyring}
return wrapper, nil
}
// NewSignerFromClientContext builds an offchain message signer from a client context
func NewSignerFromClientContext(clientCtx client.Context) (Signer, error) {
if clientCtx.TxConfig == nil {
return Signer{}, errNoTxConfig
}
if clientCtx.Keyring == nil {
return Signer{}, errNoKeyringProvided
}
privKey, err := newKeyRingWrapper(clientCtx.GetFromName(), clientCtx.Keyring)
if err != nil {
return Signer{}, err
}
return NewSigner(clientCtx.TxConfig, privKey), nil
}
// NewSigner is Signer's constructor
func NewSigner(txConfig client.TxConfig, provider SignatureProvider) Signer {
return Signer{
txConfig: txConfig,
privKey: provider,
}
}
// Signer defines an offchain messages signer
type Signer struct {
txConfig client.TxConfig
privKey SignatureProvider
}
// Sign produces a signed tx given a private key
// and the msgs we're aiming to sign
func (s Signer) Sign(msgs []sdk.Msg) (authsigning.SigVerifiableTx, error) {
if len(msgs) == 0 {
return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "no msg provided")
}
// build unsigned tx
builder := s.txConfig.NewTxBuilder()
for i, msg := range msgs {
err := verifyMessage(msg)
if err != nil {
return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "message number %d is invalid: %s", i, err)
}
}
err := builder.SetMsgs(msgs...)
if err != nil {
return nil, err
}
// prepare transaction to sign
signMode := s.txConfig.SignModeHandler().DefaultMode()
signerData := authsigning.SignerData{
Address: s.privKey.PubKey().String(),
ChainID: ExpectedChainID,
AccountNumber: ExpectedAccountNumber,
Sequence: ExpectedSequence,
}
sigData := signing.SingleSignatureData{
SignMode: signMode,
Signature: nil,
}
sig := signing.SignatureV2{
PubKey: s.privKey.PubKey(),
Data: &sigData,
Sequence: ExpectedSequence,
}
err = builder.SetSignatures(sig)
if err != nil {
return nil, err
}
bytesToSign, err := s.txConfig.SignModeHandler().
GetSignBytes(
signMode,
signerData,
builder.GetTx(),
)
if err != nil {
return nil, err
}
signedBytes, err := s.privKey.Sign(bytesToSign)
if err != nil {
return nil, err
}
sigData = signing.SingleSignatureData{
SignMode: signMode,
Signature: signedBytes,
}
sig = signing.SignatureV2{
PubKey: s.privKey.PubKey(),
Data: &sigData,
Sequence: ExpectedSequence,
}
err = builder.SetSignatures(sig)
if err != nil {
return nil, err
}
return builder.GetTx(), nil
}