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ethcontroller.go
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ethcontroller.go
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// Copyright 2017-2023 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 (
"errors"
"fmt"
"math/big"
"time"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/wealdtech/go-ens/v3/contracts/ethcontroller"
)
// ETHController is the structure for the .eth controller contract.
type ETHController struct {
backend bind.ContractBackend
Contract *ethcontroller.Contract
ContractAddr common.Address
domain string
}
// NewETHController creates a new controller for a given domain.
func NewETHController(backend bind.ContractBackend, domain string) (*ETHController, error) {
registry, err := NewRegistry(backend)
if err != nil {
return nil, err
}
resolver, err := registry.Resolver(domain)
if err != nil {
return nil, err
}
// Obtain the controller from the resolver.
controllerAddress, err := resolver.InterfaceImplementer([4]byte{0x01, 0x8f, 0xac, 0x06})
if err != nil {
return nil, err
}
return NewETHControllerAt(backend, domain, controllerAddress)
}
// NewETHControllerAt creates a .eth controller at a given address.
func NewETHControllerAt(backend bind.ContractBackend, domain string, address common.Address) (*ETHController, error) {
contract, err := ethcontroller.NewContract(address, backend)
if err != nil {
return nil, err
}
return ÐController{
backend: backend,
Contract: contract,
ContractAddr: address,
domain: domain,
}, nil
}
// IsValid returns true if the domain is considered valid by the controller.
func (c *ETHController) IsValid(domain string) (bool, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return false, fmt.Errorf("invalid name %s", domain)
}
return c.Contract.Valid(nil, name)
}
// IsAvailable returns true if the domain is available for registration.
func (c *ETHController) IsAvailable(domain string) (bool, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return false, fmt.Errorf("invalid name %s", domain)
}
return c.Contract.Available(nil, name)
}
// MinRegistrationDuration returns the minimum duration for which a name can be registered.
func (c *ETHController) MinRegistrationDuration() (time.Duration, error) {
tmp, err := c.Contract.MINREGISTRATIONDURATION(nil)
if err != nil {
return 0 * time.Second, err
}
return time.Duration(tmp.Int64()) * time.Second, nil
}
// RentCost returns the cost of rent in wei-per-second.
func (c *ETHController) RentCost(domain string) (*big.Int, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return nil, fmt.Errorf("invalid name %s", domain)
}
return c.Contract.RentPrice(nil, name, big.NewInt(1))
}
// MinCommitmentInterval returns the minimum time that has to pass between a commit and reveal.
func (c *ETHController) MinCommitmentInterval() (*big.Int, error) {
return c.Contract.MinCommitmentAge(nil)
}
// MaxCommitmentInterval returns the maximum time that has to pass between a commit and reveal.
func (c *ETHController) MaxCommitmentInterval() (*big.Int, error) {
return c.Contract.MaxCommitmentAge(nil)
}
// CommitmentHash returns the commitment hash for a label/owner/secret tuple.
func (c *ETHController) CommitmentHash(domain string, owner common.Address, secret [32]byte) (common.Hash, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return common.BytesToHash([]byte{}), fmt.Errorf("invalid name %s", domain)
}
commitment, err := c.Contract.MakeCommitment(nil, name, owner, secret)
if err != nil {
return common.BytesToHash([]byte{}), err
}
hash := common.BytesToHash(commitment[:])
return hash, err
}
// CommitmentTime states the time at which a commitment was registered on the blockchain.
func (c *ETHController) CommitmentTime(domain string, owner common.Address, secret [32]byte) (*big.Int, error) {
hash, err := c.CommitmentHash(domain, owner, secret)
if err != nil {
return nil, err
}
return c.Contract.Commitments(nil, hash)
}
// Commit sends a commitment to register a domain.
func (c *ETHController) Commit(opts *bind.TransactOpts, domain string, owner common.Address, secret [32]byte) (*types.Transaction, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return nil, fmt.Errorf("invalid name %s", domain)
}
commitment, err := c.Contract.MakeCommitment(nil, name, owner, secret)
if err != nil {
return nil, errors.New("failed to create commitment")
}
if opts.Value != nil && opts.Value.Cmp(big.NewInt(0)) != 0 {
return nil, errors.New("commitment should have 0 value")
}
return c.Contract.Commit(opts, commitment)
}
// Reveal reveals a commitment to register a domain.
func (c *ETHController) Reveal(opts *bind.TransactOpts, domain string, owner common.Address, secret [32]byte) (*types.Transaction, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return nil, fmt.Errorf("invalid name %s", domain)
}
if opts == nil {
return nil, errors.New("transaction options required")
}
if opts.Value == nil {
return nil, errors.New("no ether supplied with transaction")
}
commitTS, err := c.CommitmentTime(name, owner, secret)
if err != nil {
return nil, err
}
if commitTS.Cmp(big.NewInt(0)) == 0 {
return nil, errors.New("no commitment present")
}
commit := time.Unix(commitTS.Int64(), 0)
minCommitIntervalTS, err := c.MinCommitmentInterval()
if err != nil {
return nil, err
}
minCommitInterval := time.Duration(minCommitIntervalTS.Int64()) * time.Second
minRevealTime := commit.Add(minCommitInterval)
if time.Now().Before(minRevealTime) {
return nil, errors.New("commitment too young to reveal")
}
maxCommitIntervalTS, err := c.MaxCommitmentInterval()
if err != nil {
return nil, err
}
maxCommitInterval := time.Duration(maxCommitIntervalTS.Int64()) * time.Second
maxRevealTime := commit.Add(maxCommitInterval)
if time.Now().After(maxRevealTime) {
return nil, errors.New("commitment too old to reveal")
}
// Calculate the duration given the rent cost and the value.
costPerSecond, err := c.RentCost(domain)
if err != nil {
return nil, errors.New("failed to obtain rent cost")
}
duration := new(big.Int).Div(opts.Value, costPerSecond)
// Ensure duration is greater than minimum duration.
minDuration, err := c.MinRegistrationDuration()
if err != nil {
return nil, err
}
if big.NewInt(int64(minDuration.Seconds())).Cmp(duration) >= 0 {
return nil, fmt.Errorf("not enough funds to cover minimum duration of %v", minDuration)
}
return c.Contract.Register(opts, name, owner, duration, secret)
}
// Renew renews a registered domain.
func (c *ETHController) Renew(opts *bind.TransactOpts, domain string) (*types.Transaction, error) {
name, err := UnqualifiedName(domain, c.domain)
if err != nil {
return nil, fmt.Errorf("invalid name %s", domain)
}
// See if we're registered at all - fetch the owner to find out.
registry, err := NewRegistry(c.backend)
if err != nil {
return nil, err
}
owner, err := registry.Owner(domain)
if err != nil {
return nil, err
}
if owner == UnknownAddress {
return nil, fmt.Errorf("%s not registered", domain)
}
// Calculate the duration given the rent cost and the value.
costPerSecond, err := c.RentCost(domain)
if err != nil {
return nil, errors.New("failed to obtain rent cost")
}
duration := new(big.Int).Div(opts.Value, costPerSecond)
return c.Contract.Renew(opts, name, duration)
}