68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
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// Copyright 2019 Weald Technology Trading
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ens
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import (
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"fmt"
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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/wealdtech/go-ens/v3/contracts/dnsregistrar"
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)
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// DNSRegistrar is the structure for the registrar
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type DNSRegistrar struct {
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backend bind.ContractBackend
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domain string
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Contract *dnsregistrar.Contract
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ContractAddr common.Address
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}
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// NewDNSRegistrar obtains the registrar contract for a given domain
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func NewDNSRegistrar(backend bind.ContractBackend, domain string) (*DNSRegistrar, error) {
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address, err := RegistrarContractAddress(backend, domain)
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if err != nil {
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return nil, err
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}
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if address == UnknownAddress {
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return nil, fmt.Errorf("no registrar for domain %s", domain)
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}
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contract, err := dnsregistrar.NewContract(address, backend)
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if err != nil {
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return nil, err
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}
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// Ensure this really is a DNS registrar. To do this confirm that it supports
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// the expected interface.
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supported, err := contract.SupportsInterface(nil, [4]byte{0x1a, 0xa2, 0xe6, 0x41})
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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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return nil, fmt.Errorf("purported registrar for domain %s does not support DNS registrar functionality", domain)
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}
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return &DNSRegistrar{
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backend: backend,
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domain: domain,
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Contract: contract,
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ContractAddr: address,
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}, nil
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}
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// TODO claim
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