WIP - IBC signer

core/types/callback_signer.go

@@ -0,0 +1,44 @@
+package types
+
+import (
+	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	"math/big"
+)
+
+var _ Signer = callbackSigner{}
+
+type callbackSigner struct {
+	chainID        *big.Int
+	relayerAddress common.Address
+}
+
+func NewCallbackSigner(chainID *big.Int, relayerAddress common.Address) Signer {
+	return callbackSigner{chainID: chainID, relayerAddress: relayerAddress}
+}
+
+func (c callbackSigner) Sender(tx *Transaction) (common.Address, error) {
+	if c.relayerAddress == (common.Address{}) {
+		return common.Address{}, fmt.Errorf("relayer address not set")
+	}
+	return c.relayerAddress, nil
+}
+
+func (c callbackSigner) SignatureValues(tx *Transaction, sig []byte) (r, s, v *big.Int, err error) {
+	// TODO: Return dummy values for now
+	return new(big.Int), new(big.Int), new(big.Int), nil
+}
+
+func (c callbackSigner) ChainID() *big.Int {
+	return c.chainID
+}
+
+func (c callbackSigner) Hash(tx *Transaction) common.Hash {
+	// Assume a simple RLP hash of the transaction is sufficient
+	return rlpHash([]interface{}{tx.Nonce(), tx.GasPrice(), tx.Gas(), tx.To(), tx.Value(), tx.Data()})
+}
+
+func (c callbackSigner) Equal(signer Signer) bool {
+	_, ok := signer.(callbackSigner)
+	return ok
+}

core/types/transaction_signing.go

@@ -37,9 +37,11 @@ type sigCache struct {
 }
 
 // MakeSigner returns a Signer based on the given chain config and block number.
-func MakeSigner(config *params.ChainConfig, blockNumber *big.Int) Signer {
+func MakeSigner(config *params.ChainConfig, blockNumber *big.Int, senderAddr common.Address) Signer {
 	var signer Signer
 	switch {
+	case senderAddr != (common.Address{}):
+		signer = NewCallbackSigner(config.ChainID, senderAddr)
 	case config.IsLondon(blockNumber):
 		signer = NewLondonSigner(config.ChainID)
 	case config.IsBerlin(blockNumber):