68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// Copyright 2019 Weald Technology Trading
|
|
//
|
|
// 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 ens
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/ethereum/go-ethereum/accounts/abi/bind"
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/wealdtech/go-ens/v3/contracts/dnsregistrar"
|
|
)
|
|
|
|
// DNSRegistrar is the structure for the registrar
|
|
type DNSRegistrar struct {
|
|
backend bind.ContractBackend
|
|
domain string
|
|
Contract *dnsregistrar.Contract
|
|
ContractAddr common.Address
|
|
}
|
|
|
|
// NewDNSRegistrar obtains the registrar contract for a given domain
|
|
func NewDNSRegistrar(backend bind.ContractBackend, domain string) (*DNSRegistrar, error) {
|
|
address, err := RegistrarContractAddress(backend, domain)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if address == UnknownAddress {
|
|
return nil, fmt.Errorf("no registrar for domain %s", domain)
|
|
}
|
|
|
|
contract, err := dnsregistrar.NewContract(address, backend)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Ensure this really is a DNS registrar. To do this confirm that it supports
|
|
// the expected interface.
|
|
supported, err := contract.SupportsInterface(nil, [4]byte{0x1a, 0xa2, 0xe6, 0x41})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if !supported {
|
|
return nil, fmt.Errorf("purported registrar for domain %s does not support DNS registrar functionality", domain)
|
|
}
|
|
|
|
return &DNSRegistrar{
|
|
backend: backend,
|
|
domain: domain,
|
|
Contract: contract,
|
|
ContractAddr: address,
|
|
}, nil
|
|
}
|
|
|
|
// TODO claim
|