84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
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package eip712
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import (
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"fmt"
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"github.com/cerc-io/laconicd/types"
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"github.com/cosmos/cosmos-sdk/client"
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codectypes "github.com/cosmos/cosmos-sdk/codec/types"
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cosmoskr "github.com/cosmos/cosmos-sdk/crypto/keyring"
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"github.com/cosmos/cosmos-sdk/types/tx/signing"
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authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
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)
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// PreprocessLedgerTx reformats Ledger-signed Cosmos transactions to match the fork expected by Ethermint
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// by including the signature in a Web3Tx extension and sending a blank signature in the body.
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func PreprocessLedgerTx(chainID string, keyType cosmoskr.KeyType, txBuilder client.TxBuilder) error {
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// Only process Ledger transactions
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if keyType != cosmoskr.TypeLedger {
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return nil
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}
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// Init extension builder to set Web3 extension
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extensionBuilder, ok := txBuilder.(authtx.ExtensionOptionsTxBuilder)
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if !ok {
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return fmt.Errorf("cannot cast TxBuilder to ExtensionOptionsTxBuilder")
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}
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// Get signatures from TxBuilder
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sigs, err := txBuilder.GetTx().GetSignaturesV2()
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if err != nil {
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return fmt.Errorf("could not get signatures: %w", err)
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}
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// Verify single-signer
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if len(sigs) != 1 {
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return fmt.Errorf("invalid number of signatures, expected 1 and got %v", len(sigs))
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}
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signature := sigs[0]
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sigData, ok := signature.Data.(*signing.SingleSignatureData)
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if !ok {
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return fmt.Errorf("unexpected signature type, expected SingleSignatureData")
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}
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sigBytes := sigData.Signature
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// Parse Chain ID as big.Int
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chainIDInt, err := types.ParseChainID(chainID)
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if err != nil {
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return fmt.Errorf("could not parse chain id: %w", err)
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}
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// Add ExtensionOptionsWeb3Tx extension with signature
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var option *codectypes.Any
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option, err = codectypes.NewAnyWithValue(&types.ExtensionOptionsWeb3Tx{
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FeePayer: txBuilder.GetTx().FeePayer().String(),
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TypedDataChainID: chainIDInt.Uint64(),
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FeePayerSig: sigBytes,
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})
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if err != nil {
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return fmt.Errorf("could not set extension as any: %w", err)
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}
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extensionBuilder.SetExtensionOptions(option)
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// Set blank signature with Amino Sign Type
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// (Regardless of input signMode, Evmos requires Amino signature type for Ledger)
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blankSig := signing.SingleSignatureData{
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SignMode: signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON,
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Signature: nil,
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}
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sig := signing.SignatureV2{
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PubKey: signature.PubKey,
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Data: &blankSig,
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Sequence: signature.Sequence,
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}
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err = txBuilder.SetSignatures(sig)
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if err != nil {
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return fmt.Errorf("unable to set signatures on payload: %w", err)
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}
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return nil
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}
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