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offchain_config_digester.go
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/
offchain_config_digester.go
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package mercury
import (
"crypto/ed25519"
"encoding/hex"
"github.com/ethereum/go-ethereum/common"
"github.com/pkg/errors"
"github.com/smartcontractkit/libocr/offchainreporting2/types"
ocrtypes "github.com/smartcontractkit/libocr/offchainreporting2/types"
"github.com/smartcontractkit/wsrpc/credentials"
)
// Originally sourced from: https://github.com/smartcontractkit/offchain-reporting/blob/991ebe1462fd56826a1ddfb34287d542acb2baee/lib/offchainreporting2/chains/evmutil/offchain_config_digester.go
var _ ocrtypes.OffchainConfigDigester = OffchainConfigDigester{}
func NewOffchainConfigDigester(feedID [32]byte, chainID uint64, contractAddress common.Address) OffchainConfigDigester {
return OffchainConfigDigester{feedID, chainID, contractAddress}
}
type OffchainConfigDigester struct {
FeedID [32]byte
ChainID uint64
ContractAddress common.Address
}
func (d OffchainConfigDigester) ConfigDigest(cc types.ContractConfig) (types.ConfigDigest, error) {
signers := []common.Address{}
for i, signer := range cc.Signers {
if len(signer) != 20 {
return types.ConfigDigest{}, errors.Errorf("%v-th evm signer should be a 20 byte address, but got %x", i, signer)
}
a := common.BytesToAddress(signer)
signers = append(signers, a)
}
transmitters := []credentials.StaticSizedPublicKey{}
for i, transmitter := range cc.Transmitters {
if len(transmitter) != 2*ed25519.PublicKeySize {
return types.ConfigDigest{}, errors.Errorf("%v-th evm transmitter should be a 64 character hex-encoded ed25519 public key, but got '%v' (%d chars)", i, transmitter, len(transmitter))
}
var t credentials.StaticSizedPublicKey
b, err := hex.DecodeString(string(transmitter))
if err != nil {
return types.ConfigDigest{}, errors.Wrapf(err, "%v-th evm transmitter is not valid hex, got: %q", i, transmitter)
}
copy(t[:], b)
transmitters = append(transmitters, t)
}
return configDigest(
d.FeedID,
d.ChainID,
d.ContractAddress,
cc.ConfigCount,
signers,
transmitters,
cc.F,
cc.OnchainConfig,
cc.OffchainConfigVersion,
cc.OffchainConfig,
), nil
}
func (d OffchainConfigDigester) ConfigDigestPrefix() types.ConfigDigestPrefix {
return types.ConfigDigestPrefixEVM
}