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add ENS tools
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‎basic/61-ENS/contracts/push2ENS.sol

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// SPDX-License-Identifier: UNLICENSED
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// ____ _ _ ____ _ _ ____ ____ __ _ ____
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// ( _ \/ )( \/ ___)/ )( \ (___ \ ( __)( ( \/ ___)
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// ) __/) \/ (\___ \) __ ( / __/ ) _) / /\___ \
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// (__) \____/(____/\_)(_/ (____) (____)\_)__)(____/
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//
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// By Alex Van de Sande
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//
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// A little contract that adds push & pull money transfer to ENS ensAddresses.
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// Will work with any ENS, existing or future, including DNS names!
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// Ether, tokens and NFTs remain locked by contract until ENS is set up properly.
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// Once ENS points to a non-zero address, anyone can pull it there.
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//
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// Want to donate USDC to wikipedia.org but they don't have an eth address yet?
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// Want to send an NFT to xkcd.org but you're not sure how to trust the address?
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// Want to make an Ether bounty for the Ethiopian government to be aware of ENS?
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// Now you can do all that and more!
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// But wait, there's more! You can also use it to push to a normal address.
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// Just because.
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//
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// ATTENTION: use at your own risk! I've barely tested it. And by barely I mean I tried a couple different things
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// on rinkeby and once they worked I deployed to mainnet. NFTs don't use _safeTransfer
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// because I was too lazy to build my own onerc721Received. Be careful out there.
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pragma solidity ^0.8.0;
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/// @title Push to ENS
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/// @author Alex Van de Sande
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/// @notice Allows tokens and ether to be deposited to ENS names
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/// @dev Supports ether, erc20 tokens and erc721 NFTs.
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import "./supportsENS.sol";
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// works for both Tokens and NFTs
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abstract contract Transferable {
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function transferFrom(address from, address to, uint tokens) virtual public;
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}
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contract PushToENS is SupportsENS {
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/// @notice Internal balance function
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/// @dev Balances are a hash based on token and account information
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mapping(bytes32 => Balance) public balances;
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struct Balance {
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uint256 withdrawable;
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uint256 lastBlockPulled;
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mapping(address => uint256) pusher;
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mapping(address => uint256) lastPushed;
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}
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event Pushed(bytes32 nameHash, address assetAddress, uint8 sendType, uint256 amount);
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event Pulled(bytes32 nameHash, address assetAddress, uint8 sendType, uint256 amount);
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event Cancel(bytes32 nameHash, address assetAddress, uint8 sendType, uint256 amount);
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// PUSH FUNCTIONS
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/**
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* @dev Generic internal push functions
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*/
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function _push (bytes32 hash, uint256 amount, address assetAddress, uint8 sendType) internal {
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Balance storage balance = balances[hash];
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// If there was a pull since you last pushed, then you can't withdraw that amount anymore
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if (balance.lastPushed[msg.sender] < balance.lastBlockPulled) balance.pusher[msg.sender]=0;
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// Weird things can happen in the same block
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require(balance.lastPushed[msg.sender] != balance.lastBlockPulled || balance.lastBlockPulled == 0, "You can't push the same block on a pull");
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// Prevent Overflows
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require(balance.pusher[msg.sender] + amount > balance.pusher[msg.sender] , "Overflow detected!");
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require(balance.withdrawable + amount > balance.withdrawable , "Overflow detected!");
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// Increase the balances
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balance.withdrawable += amount;
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balance.pusher[msg.sender]+= amount;
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balance.lastPushed[msg.sender] = block.number;
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// tell everyone about it
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emit Pushed(hash, assetAddress, sendType, amount);
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}
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/**
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* @notice Pushes ether sent in transaction for an ENS name represented by `nameHash`
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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*/
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function pushEther2ENS (bytes32 nameHash) public payable {
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_push(nameHash, msg.value, 0x0000000000000000000000000000000000000000, 0);
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}
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/**
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* @notice Pushes ether sent in transaction for `ethAddress`
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* @param ethAddress a standard ethereum compatible address
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*/
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function pushEther2Ethadd (address ethAddress) public payable {
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_push(keccak256(abi.encode(ethAddress)), msg.value, 0x0000000000000000000000000000000000000000, 1);
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}
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/**
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* @notice Pushes `amount` standard units of the `assetAddress` token for an ENS address represented by `nameHash`.
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* @notice If `nftId` is set, then it assumes it's a ERC721 NFT and sends the one with `nftId`.
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* @dev If it's a token, leave nftId as 0. Can't send any NFT with id 0.
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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* @param assetAddress The address of either the token or NFT
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* @param amount Token amount. If it's an NFT, leave 0.
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* @param nftId the id of the NFT being sent. If it's a token, leave 0.
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*/
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function pushAsset2ENS (bytes32 nameHash, address assetAddress, uint256 amount, uint256 nftId) public {
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// instantiate token
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Transferable asset = Transferable(assetAddress);
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uint256 wat;
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if (nftId==0) {
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// If fungible, then add all balances
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wat = amount;
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_push(keccak256(abi.encode(nameHash,assetAddress)), amount, assetAddress, 2);
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} else {
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// If not, then use amount as the nft ID
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wat = nftId;
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_push(keccak256(abi.encode(nameHash,assetAddress,nftId)), nftId, assetAddress, 3);
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}
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// transfer assets. Doesn't add a require, assumes token will revert if fails
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asset.transferFrom(msg.sender, address(this), wat);
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}
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// PULL FUNCTIONS
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/**
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* @dev Generic internal pull function
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*/
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function _pull (bytes32 hash, address assetAddress, uint8 sendType) internal returns (uint256 amount){
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Balance storage balance = balances[hash];
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amount = balance.withdrawable;
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//Pull full amount always
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balance.withdrawable=0;
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balance.lastBlockPulled = block.number;
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// Interaction
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emit Pulled(hash, assetAddress, sendType, amount );
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return amount;
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}
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/**
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* @notice Pulls ether for any valid ENS name.
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* @dev Function can be called by anyone. Will revert if ENS name is not set, or set to 0x.
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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*/
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function pullEther2ENS (bytes32 nameHash) public {
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// Zeroes out full balance
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uint256 amount = _pull(nameHash, 0x0000000000000000000000000000000000000000, 0);
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//Interaction
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// getSafeENSAddress prevents returning empty address
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sendValue(payable(getSafeENSAddress(nameHash)), amount);
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}
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/**
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* @notice Pulls all ether pushed for your address.
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* @dev Can only be called by the address receiving the token.
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*/
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function pullEther2Ethadd () public {
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// Zeroes out full balance
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uint256 amount = _pull(keccak256(abi.encode(msg.sender)), 0x0000000000000000000000000000000000000000, 1);
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//Interaction
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sendValue(payable(msg.sender), amount);
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}
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/**
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* @notice Pulls all of the balance from token `assetAddress` for the ENS address represented by `nameHash`.
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* @notice If `nftId` is set, then it assumes it's a NFT and pulls the one with `nftId`.
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* @dev Can be called by anyone. If it's a token, leave nftId as 0. Can only pull full amounts.
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* @dev Function will revert if ENS is not set or set to 0x0.
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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* @param assetAddress The address of either the token or NFT
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* @param nftId the id of the NFT being sent. If it's a token, leave 0.
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*/
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function pullAsset2ENS (bytes32 nameHash, address assetAddress, uint nftId) public {
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// instantiate token
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Transferable asset = Transferable(assetAddress);
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uint256 wat;
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// If it's a token then use nftId as 0
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if (nftId==0){
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//if ID is 0 then it's a token
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wat = _pull(keccak256(abi.encode(nameHash,assetAddress)), assetAddress, 2);
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} else {
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//if ID is set then it's an NFT
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wat = nftId;
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_pull(keccak256(abi.encode(nameHash, assetAddress, nftId)), assetAddress, 3);
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}
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// getSafeENSAddress prevents returning empty address
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asset.transferFrom(address(this), getSafeENSAddress(nameHash), wat);
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}
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// CANCEL FUNCTIONS
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/**
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* @dev Generic internal cancel function
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*/
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function _cancel (bytes32 hash, uint256 amount, address assetAddress, uint8 sendType) internal {
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Balance storage balance = balances[hash];
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// Can only cancel if there wasn't a push yet
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require(balance.lastPushed[msg.sender] > balance.lastBlockPulled || balance.lastBlockPulled == 0, "Recipient already withdrew");
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// Check if enough balance
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require(amount <= balance.pusher[msg.sender] , "Not enough balance");
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require(amount <= balance.withdrawable , "Not enough balance");
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// Decrease both balances
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balance.pusher[msg.sender]-= amount;
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balance.withdrawable -= amount;
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// Interaction
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emit Cancel(hash, assetAddress, sendType, amount );
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}
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/**
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* @dev Get back `amount/1000000000000000000` ether you had pushed to an ENS name but it hasn't pulled yet.
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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* @param amount Ether amount you want to get back.
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*/
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function cancelEther2ENS (bytes32 nameHash, uint256 amount) public {
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// Generic cancel function
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_cancel(nameHash, amount, 0x0000000000000000000000000000000000000000, 0);
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//Interaction
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// getSafeENSAddress prevents returning empty address
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sendValue(payable(msg.sender), amount);
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}
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/**
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* @dev Get back `amount/1000000000000000000` ether you had pushed to an Eth address name but it hasn't pulled yet.
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* @param ethAddress The address which you had pushed to.
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* @param amount Ether amount you want to get back.
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*/
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function cancelEther2Ethadd (address ethAddress, uint256 amount) public {
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// Generic cancel function
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_cancel(keccak256(abi.encode(ethAddress)), amount, 0x0000000000000000000000000000000000000000, 1);
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//Interaction
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sendValue(payable(msg.sender), amount);
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}
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/**
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* @notice Get back tokens or NFT you had pushed to an ENS name but hasn't been claimed yet.
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* @param nameHash a 256-bit hash that represents an ENS name. See: https://docs.ens.domains/contract-api-reference/name-processing
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* @param assetAddress The address of either the token or NFT
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* @param amount Amount you want to pull back
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* @param nftId the id of the NFT being sent. If it's a token, leave 0.
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*/
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function cancelAsset2ENS (bytes32 nameHash, address assetAddress, uint256 amount, uint256 nftId) public {
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// instantiate token
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Transferable asset = Transferable(assetAddress);
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uint256 wat;
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//generic cancel
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// getSafeENSAddress prevents returning empty address
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if (nftId==0) {
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// If it's a token then pull all of them
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wat= amount;
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_cancel(keccak256(abi.encode(nameHash,assetAddress)), amount, assetAddress, 2);
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} else {
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// if it's an NFT use amount as tokenId
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wat=nftId;
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_cancel(keccak256(abi.encode(nameHash, assetAddress, nftId)), nftId, assetAddress, 3);
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}
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// transfer tokens
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asset.transferFrom(address(this), msg.sender, wat);
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}
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/**
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* Open Zeppellin's Send Value
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* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
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* `recipient`, forwarding all available gas and reverting on errors.
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*
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* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
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* of certain opcodes, possibly making contracts go over the 2300 gas limit
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* imposed by `transfer`, making them unable to receive funds via
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* `transfer`. {sendValue} removes this limitation.
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*
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* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
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*
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* IMPORTANT: because control is transferred to `recipient`, care must be
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* taken to not create reentrancy vulnerabilities. Consider using
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* {ReentrancyGuard} or the
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* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
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*/
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function sendValue(address payable recipient, uint256 amount) internal {
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require(address(this).balance >= amount, "Address: insufficient balance");
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(bool success, ) = recipient.call{value: amount}("");
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require(success, "Address: unable to send value, recipient may have reverted");
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}
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}

‎basic/61-ENS/contracts/supportENS.sol

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// This is a quick and small library for allowing any contract to
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// use ENS names like they would use a standard address.
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// So a DAO can have bob.eth as the member, instead of 0x123,
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// and therefore Bob can change that address to whatever they prefer
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// or give out a tip that can be only received by the rightful owner of example.com
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// even if example.com owner never heard about ethereum!
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//
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// To use it, just use a store the NameHash as a string and then call
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// updateAddress(NameHash) to save the latest ethereum address it points to
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// Once that has been saved, use ensAddresses(NameHash) to obtain a valid eth address.
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// Optionally, you can check lastUpdatedENSAt(NameHash) to check the last time
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// it was updated. If it was never updated then both functions should return 0:
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// IMPORTANT: check if address is not address(0) before sending ether.
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// Learn more about NameHash: https://docs.ens.domains/contract-api-reference/name-processing
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// Learn more about full DNS support in ENS: https://medium.com/the-ethereum-name-service/full-dns-namespace-integration-to-ens-now-on-mainnet-9d37270807d3
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// Learn more about ENS: ens.domains
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// Author: Alex Van de Sande
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// License: Public Domain
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pragma solidity ^0.8.0;
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abstract contract ENS {
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function resolver(string memory node) public virtual view returns (Resolver);
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}
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abstract contract Resolver {
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function addr(string memory node) public virtual view returns (address);
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}
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contract SupportsENS {
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// Same address for Mainet, Ropsten, Rinkerby, Gorli and other networks;
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ENS ens = ENS(0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e);
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// Optional modifier to only allow calls from a specific ENS owner
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modifier onlyENSOwner(string memory nameHash) {
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require(
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msg.sender == getENSAddress(nameHash),
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"Only ENS owner can call this contract"
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);
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_;
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}
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// Main function to get an address
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// ATTENTION: if an ENS is not set or claimed, it will return 0x0.
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// Make sure to check this before sending ether.
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function getENSAddress(string memory nameHash) public view returns (address){
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Resolver resolver = ens.resolver(nameHash);
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return resolver.addr(nameHash);
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}
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// Similar to the function above but will
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// revert if the address returns 0x00..
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function getSafeENSAddress(string memory nameHash) public view returns (address){
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Resolver resolver = ens.resolver(nameHash);
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address res = resolver.addr(nameHash);
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require(res != address(0), "address not set or set to burn");
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return res;
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}
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}

‎basic/61-ENS/readme.md

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ENS的工作是将可读的域名（比如"alice.eth"）解析为计算机可以识别的标识符，如以太坊地址、内容的散列、元数据等。ENS还支持"反向解析"，这使得将元数据(如规范化域名或接口描述)与以太坊地址相关联成为可能
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### ENS tools
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- supportENS.sol
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- push2ENS.sol
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Refer to https://github.com/alexvansande/ENSTools
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### 使用流程
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ENS JavaScript 库：

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