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builderbid_json.go
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builderbid_json.go
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// Copyright © 2022 Attestant Limited.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package capella
import (
"encoding/hex"
"encoding/json"
"fmt"
"math/big"
"strings"
"github.com/MEV-HEPU/go-eth2-client/spec/capella"
"github.com/MEV-HEPU/go-eth2-client/spec/phase0"
"github.com/holiman/uint256"
"github.com/pkg/errors"
)
// builderBidJSON is the spec representation of the struct.
type builderBidJSON struct {
Header *capella.ExecutionPayloadHeader `json:"header"`
Value string `json:"value"`
Pubkey string `json:"pubkey"`
}
// MarshalJSON implements json.Marshaler.
func (b *BuilderBid) MarshalJSON() ([]byte, error) {
return json.Marshal(&builderBidJSON{
Header: b.Header,
Value: fmt.Sprintf("%d", b.Value),
Pubkey: fmt.Sprintf("%#x", b.Pubkey),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (b *BuilderBid) UnmarshalJSON(input []byte) error {
var data builderBidJSON
if err := json.Unmarshal(input, &data); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return b.unpack(&data)
}
func (b *BuilderBid) unpack(data *builderBidJSON) error {
if data.Header == nil {
return errors.New("header missing")
}
b.Header = data.Header
if data.Value == "" {
return errors.New("value missing")
}
value, success := new(big.Int).SetString(data.Value, 10)
if !success {
return errors.New("invalid value for value")
}
if value.Sign() == -1 {
return errors.New("value cannot be negative")
}
var overflow bool
b.Value, overflow = uint256.FromBig(value)
if overflow {
return errors.New("value overflow")
}
if data.Pubkey == "" {
return errors.New("public key missing")
}
pubKey, err := hex.DecodeString(strings.TrimPrefix(data.Pubkey, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for public key")
}
if len(pubKey) != phase0.PublicKeyLength {
return errors.New("incorrect length for public key")
}
copy(b.Pubkey[:], pubKey)
return nil
}