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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package ens
//go:generate abigen --sol contract/ens.sol --pkg contract --out contract/ens.go
import (
"math/big"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/contracts/ens/contract"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
)
// swarm domain name registry and resolver
type ENS struct {
*contract.ENSSession
contractBackend bind.ContractBackend
}
// NewENS creates a struct exposing convenient high-level operations for interacting with
// the Ethereum Name Service.
func NewENS(transactOpts *bind.TransactOpts, contractAddr common.Address, contractBackend bind.ContractBackend) (*ENS, error) {
ens, err := contract.NewENS(contractAddr, contractBackend)
if err != nil {
return nil, err
}
return &ENS{
&contract.ENSSession{
Contract: ens,
TransactOpts: *transactOpts,
},
contractBackend,
}, nil
}
// DeployENS deploys an instance of the ENS nameservice, with a 'first in first served' root registrar.
func DeployENS(transactOpts *bind.TransactOpts, contractBackend bind.ContractBackend) (*ENS, error) {
// Deploy the ENS registry
ensAddr, _, _, err := contract.DeployENS(transactOpts, contractBackend, transactOpts.From)
if err != nil {
return nil, err
}
ens, err := NewENS(transactOpts, ensAddr, contractBackend)
if err != nil {
return nil, err
}
// Deploy the registrar
regAddr, _, _, err := contract.DeployFIFSRegistrar(transactOpts, contractBackend, ensAddr, [32]byte{})
if err != nil {
return nil, err
}
// Set the registrar as owner of the ENS root
_, err = ens.SetOwner([32]byte{}, regAddr)
if err != nil {
return nil, err
}
return ens, nil
}
func ensParentNode(name string) (common.Hash, common.Hash) {
parts := strings.SplitN(name, ".", 2)
label := crypto.Keccak256Hash([]byte(parts[0]))
if len(parts) == 1 {
return [32]byte{}, label
} else {
parentNode, parentLabel := ensParentNode(parts[1])
return crypto.Keccak256Hash(parentNode[:], parentLabel[:]), label
}
}
func ensNode(name string) common.Hash {
parentNode, parentLabel := ensParentNode(name)
return crypto.Keccak256Hash(parentNode[:], parentLabel[:])
}
func (self *ENS) getResolver(node [32]byte) (*contract.PublicResolverSession, error) {
resolverAddr, err := self.Resolver(node)
if err != nil {
return nil, err
}
resolver, err := contract.NewPublicResolver(resolverAddr, self.contractBackend)
if err != nil {
return nil, err
}
return &contract.PublicResolverSession{
Contract: resolver,
TransactOpts: self.TransactOpts,
}, nil
}
func (self *ENS) getRegistrar(node [32]byte) (*contract.FIFSRegistrarSession, error) {
registrarAddr, err := self.Owner(node)
if err != nil {
return nil, err
}
registrar, err := contract.NewFIFSRegistrar(registrarAddr, self.contractBackend)
if err != nil {
return nil, err
}
return &contract.FIFSRegistrarSession{
Contract: registrar,
TransactOpts: self.TransactOpts,
}, nil
}
// Resolve is a non-transactional call that returns the content hash associated with a name.
func (self *ENS) Resolve(name string) (common.Hash, error) {
node := ensNode(name)
resolver, err := self.getResolver(node)
if err != nil {
return common.Hash{}, err
}
ret, err := resolver.Content(node)
if err != nil {
return common.Hash{}, err
}
return common.BytesToHash(ret[:]), nil
}
// Register registers a new domain name for the caller, making them the owner of the new name.
// Only works if the registrar for the parent domain implements the FIFS registrar protocol.
func (self *ENS) Register(name string) (*types.Transaction, error) {
parentNode, label := ensParentNode(name)
registrar, err := self.getRegistrar(parentNode)
if err != nil {
return nil, err
}
opts := self.TransactOpts
opts.GasLimit = big.NewInt(200000)
return registrar.Contract.Register(&opts, label, self.TransactOpts.From)
}
// SetContentHash sets the content hash associated with a name. Only works if the caller
// owns the name, and the associated resolver implements a `setContent` function.
func (self *ENS) SetContentHash(name string, hash common.Hash) (*types.Transaction, error) {
node := ensNode(name)
resolver, err := self.getResolver(node)
if err != nil {
return nil, err
}
opts := self.TransactOpts
opts.GasLimit = big.NewInt(200000)
return resolver.Contract.SetContent(&opts, node, hash)
}
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