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-rw-r--r--contracts/ens/ens.go178
1 files changed, 178 insertions, 0 deletions
diff --git a/contracts/ens/ens.go b/contracts/ens/ens.go
new file mode 100644
index 000000000..59147e183
--- /dev/null
+++ b/contracts/ens/ens.go
@@ -0,0 +1,178 @@
+// 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/core/types"
+ "github.com/ethereum/go-ethereum/crypto"
+ "github.com/ethereum/go-ethereum/contracts/ens/contract"
+)
+
+// 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)
+}