status-go/vendor/github.com/wealdtech/go-ens/v3/dnsregistrar.go

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// 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