mirror of https://github.com/poanetwork/quorum.git
179 lines
5.1 KiB
Go
179 lines
5.1 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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import (
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"math/big"
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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/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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)
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// 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) (*ENS, error) {
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// Deploy the ENS registry
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ensAddr, _, _, err := contract.DeployENS(transactOpts, contractBackend, transactOpts.From)
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if err != nil {
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return 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 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 nil, err
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}
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// Set the registrar as owner of the ENS root
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_, err = ens.SetOwner([32]byte{}, regAddr)
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if err != nil {
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return nil, err
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}
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return 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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} else {
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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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}
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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 (self *ENS) getResolver(node [32]byte) (*contract.PublicResolverSession, error) {
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resolverAddr, err := self.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, self.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: self.TransactOpts,
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}, nil
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}
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func (self *ENS) getRegistrar(node [32]byte) (*contract.FIFSRegistrarSession, error) {
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registrarAddr, err := self.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, self.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: self.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 (self *ENS) Resolve(name string) (common.Hash, error) {
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node := ensNode(name)
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resolver, err := self.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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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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// 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 (self *ENS) Register(name string) (*types.Transaction, error) {
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parentNode, label := ensParentNode(name)
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registrar, err := self.getRegistrar(parentNode)
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if err != nil {
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return nil, err
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}
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opts := self.TransactOpts
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opts.GasLimit = big.NewInt(200000)
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return registrar.Contract.Register(&opts, label, self.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 `setContent` function.
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func (self *ENS) SetContentHash(name string, hash common.Hash) (*types.Transaction, error) {
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node := ensNode(name)
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resolver, err := self.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 := self.TransactOpts
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opts.GasLimit = big.NewInt(200000)
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return resolver.Contract.SetContent(&opts, node, hash)
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}
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