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solana.go
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solana.go
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package signer
import (
"fmt"
"github.com/btcsuite/btcutil/base58"
bin "github.com/gagliardetto/binary"
"github.com/gagliardetto/solana-go"
)
type SolanaWallet struct{}
func (sw *SolanaWallet) SignTransaction(privateKeys []string, unsignedTx *UnsignedTx) (*SignedTx, error) {
signers := make([]solana.PrivateKey, 0, len(privateKeys))
for _, privateKey := range privateKeys {
signer, err := solana.PrivateKeyFromBase58(privateKey)
if err != nil {
return nil, fmt.Errorf("error getting private key: %w", err)
}
signers = append(signers, signer)
}
data := base58.Decode(string(unsignedTx.Data))
// parse transaction:
tx, err := solana.TransactionFromDecoder(bin.NewBinDecoder(data))
if err != nil {
panic(err)
}
// clear signatures: https://github.com/gagliardetto/solana-go/issues/186
tx.Signatures = nil
if _, err = tx.Sign(func(key solana.PublicKey) *solana.PrivateKey {
for _, candidate := range signers {
if candidate.PublicKey().Equals(key) {
return &candidate
}
}
return nil
}); err != nil {
return nil, fmt.Errorf("error signing transaction: %w", err)
}
marshaledTx, err := tx.MarshalBinary()
if err != nil {
return nil, fmt.Errorf("error marshaling transaction: %w", err)
}
base58EncodedTx := base58.Encode(marshaledTx)
return &SignedTx{
Data: []byte(base58EncodedTx),
}, nil
}