mirror of https://github.com/status-im/op-geth.git
264 lines
8.1 KiB
Go
264 lines
8.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package ens
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//go:generate abigen --sol contract/ENS.sol --pkg contract --out contract/ens.go
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//go:generate abigen --sol contract/ENSRegistry.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/ensregistry.go
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//go:generate abigen --sol contract/FIFSRegistrar.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/fifsregistrar.go
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//go:generate abigen --sol contract/PublicResolver.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/publicresolver.go
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import (
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"encoding/binary"
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"strings"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/contracts/ens/contract"
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"github.com/ethereum/go-ethereum/contracts/ens/fallback_contract"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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)
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var (
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MainNetAddress = common.HexToAddress("0x314159265dD8dbb310642f98f50C066173C1259b")
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TestNetAddress = common.HexToAddress("0x112234455c3a32fd11230c42e7bccd4a84e02010")
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contentHash_Interface_Id [4]byte
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)
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const contentHash_Interface_Id_Spec = 0xbc1c58d1
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func init() {
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binary.BigEndian.PutUint32(contentHash_Interface_Id[:], contentHash_Interface_Id_Spec)
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}
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// ENS is the swarm domain name registry and resolver
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type ENS struct {
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*contract.ENSSession
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contractBackend bind.ContractBackend
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}
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// NewENS creates a struct exposing convenient high-level operations for interacting with
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// the Ethereum Name Service.
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func NewENS(transactOpts *bind.TransactOpts, contractAddr common.Address, contractBackend bind.ContractBackend) (*ENS, error) {
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ens, err := contract.NewENS(contractAddr, contractBackend)
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if err != nil {
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return nil, err
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}
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return &ENS{
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&contract.ENSSession{
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Contract: ens,
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TransactOpts: *transactOpts,
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},
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contractBackend,
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}, nil
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}
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// DeployENS deploys an instance of the ENS nameservice, with a 'first-in, first-served' root registrar.
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func DeployENS(transactOpts *bind.TransactOpts, contractBackend bind.ContractBackend) (common.Address, *ENS, error) {
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// Deploy the ENS registry
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ensAddr, _, _, err := contract.DeployENSRegistry(transactOpts, contractBackend)
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if err != nil {
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return ensAddr, nil, err
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}
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ens, err := NewENS(transactOpts, ensAddr, contractBackend)
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if err != nil {
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return ensAddr, nil, err
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}
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// Deploy the registrar
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regAddr, _, _, err := contract.DeployFIFSRegistrar(transactOpts, contractBackend, ensAddr, [32]byte{})
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if err != nil {
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return ensAddr, nil, err
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}
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// Set the registrar as owner of the ENS root
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if _, err = ens.SetOwner([32]byte{}, regAddr); err != nil {
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return ensAddr, nil, err
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}
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return ensAddr, ens, nil
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}
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func ensParentNode(name string) (common.Hash, common.Hash) {
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parts := strings.SplitN(name, ".", 2)
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label := crypto.Keccak256Hash([]byte(parts[0]))
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if len(parts) == 1 {
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return [32]byte{}, label
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}
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parentNode, parentLabel := ensParentNode(parts[1])
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return crypto.Keccak256Hash(parentNode[:], parentLabel[:]), label
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}
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func EnsNode(name string) common.Hash {
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parentNode, parentLabel := ensParentNode(name)
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return crypto.Keccak256Hash(parentNode[:], parentLabel[:])
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}
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func (ens *ENS) getResolver(node [32]byte) (*contract.PublicResolverSession, error) {
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resolverAddr, err := ens.Resolver(node)
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if err != nil {
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return nil, err
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}
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resolver, err := contract.NewPublicResolver(resolverAddr, ens.contractBackend)
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if err != nil {
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return nil, err
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}
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return &contract.PublicResolverSession{
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Contract: resolver,
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TransactOpts: ens.TransactOpts,
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}, nil
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}
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func (ens *ENS) getFallbackResolver(node [32]byte) (*fallback_contract.PublicResolverSession, error) {
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resolverAddr, err := ens.Resolver(node)
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if err != nil {
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return nil, err
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}
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resolver, err := fallback_contract.NewPublicResolver(resolverAddr, ens.contractBackend)
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if err != nil {
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return nil, err
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}
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return &fallback_contract.PublicResolverSession{
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Contract: resolver,
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TransactOpts: ens.TransactOpts,
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}, nil
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}
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func (ens *ENS) getRegistrar(node [32]byte) (*contract.FIFSRegistrarSession, error) {
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registrarAddr, err := ens.Owner(node)
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if err != nil {
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return nil, err
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}
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registrar, err := contract.NewFIFSRegistrar(registrarAddr, ens.contractBackend)
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if err != nil {
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return nil, err
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}
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return &contract.FIFSRegistrarSession{
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Contract: registrar,
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TransactOpts: ens.TransactOpts,
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}, nil
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}
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// Resolve is a non-transactional call that returns the content hash associated with a name.
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func (ens *ENS) Resolve(name string) (common.Hash, error) {
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node := EnsNode(name)
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resolver, err := ens.getResolver(node)
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if err != nil {
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return common.Hash{}, err
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}
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// IMPORTANT: The old contract is deprecated. This code should be removed latest on June 1st 2019
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supported, err := resolver.SupportsInterface(contentHash_Interface_Id)
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if err != nil {
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return common.Hash{}, err
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}
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if !supported {
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resolver, err := ens.getFallbackResolver(node)
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if err != nil {
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return common.Hash{}, err
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}
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ret, err := resolver.Content(node)
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if err != nil {
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return common.Hash{}, err
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}
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return common.BytesToHash(ret[:]), nil
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}
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// END DEPRECATED CODE
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contentHash, err := resolver.Contenthash(node)
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if err != nil {
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return common.Hash{}, err
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}
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return extractContentHash(contentHash)
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}
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// Addr is a non-transactional call that returns the address associated with a name.
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func (ens *ENS) Addr(name string) (common.Address, error) {
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node := EnsNode(name)
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resolver, err := ens.getResolver(node)
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if err != nil {
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return common.Address{}, err
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}
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ret, err := resolver.Addr(node)
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if err != nil {
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return common.Address{}, err
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}
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return common.BytesToAddress(ret[:]), nil
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}
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// SetAddress sets the address associated with a name. Only works if the caller
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// owns the name, and the associated resolver implements a `setAddress` function.
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func (ens *ENS) SetAddr(name string, addr common.Address) (*types.Transaction, error) {
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node := EnsNode(name)
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resolver, err := ens.getResolver(node)
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if err != nil {
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return nil, err
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}
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opts := ens.TransactOpts
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opts.GasLimit = 200000
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return resolver.Contract.SetAddr(&opts, node, addr)
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}
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// Register registers a new domain name for the caller, making them the owner of the new name.
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// Only works if the registrar for the parent domain implements the FIFS registrar protocol.
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func (ens *ENS) Register(name string) (*types.Transaction, error) {
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parentNode, label := ensParentNode(name)
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registrar, err := ens.getRegistrar(parentNode)
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if err != nil {
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return nil, err
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}
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return registrar.Contract.Register(&ens.TransactOpts, label, ens.TransactOpts.From)
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}
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// SetContentHash sets the content hash associated with a name. Only works if the caller
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// owns the name, and the associated resolver implements a `setContenthash` function.
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func (ens *ENS) SetContentHash(name string, hash []byte) (*types.Transaction, error) {
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node := EnsNode(name)
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resolver, err := ens.getResolver(node)
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if err != nil {
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return nil, err
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}
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opts := ens.TransactOpts
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opts.GasLimit = 200000
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// IMPORTANT: The old contract is deprecated. This code should be removed latest on June 1st 2019
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supported, err := resolver.SupportsInterface(contentHash_Interface_Id)
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if err != nil {
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return nil, err
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}
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if !supported {
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resolver, err := ens.getFallbackResolver(node)
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if err != nil {
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return nil, err
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}
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opts := ens.TransactOpts
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opts.GasLimit = 200000
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var b [32]byte
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copy(b[:], hash)
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return resolver.Contract.SetContent(&opts, node, b)
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}
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// END DEPRECATED CODE
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return resolver.Contract.SetContenthash(&opts, node, hash)
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}
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