67 lines
2.0 KiB
Solidity
67 lines
2.0 KiB
Solidity
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/**
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* This is tornado.cash airdrop for early adopters. In order to claim your TORN token please follow https://tornado.cash/airdrop
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*/
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.6.0;
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pragma experimental ABIEncoderV2;
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import { ERC20 } from "@openzeppelin/contracts-v3/token/ERC20/ERC20.sol";
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import { IERC20 } from "@openzeppelin/contracts-v3/token/ERC20/IERC20.sol";
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import { SafeERC20 } from "@openzeppelin/contracts-v3/token/ERC20/SafeERC20.sol";
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import { EnsResolve } from "./ENS.sol";
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contract Voucher is ERC20("TornadoCash voucher for early adopters", "vTORN"), EnsResolve {
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using SafeERC20 for IERC20;
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IERC20 public immutable torn;
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uint256 public immutable expiresAt;
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address public immutable governance;
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mapping(address => bool) public allowedTransferee;
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struct Recipient {
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address to;
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uint256 amount;
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}
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constructor(
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bytes32 _torn,
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bytes32 _governance,
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uint256 _duration,
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Recipient[] memory _airdrops
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) public {
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torn = IERC20(resolve(_torn));
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governance = resolve(_governance);
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expiresAt = blockTimestamp().add(_duration);
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for (uint256 i = 0; i < _airdrops.length; i++) {
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_mint(_airdrops[i].to, _airdrops[i].amount);
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allowedTransferee[_airdrops[i].to] = true;
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}
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}
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function redeem() external {
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require(blockTimestamp() < expiresAt, "Airdrop redeem period has ended");
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uint256 amount = balanceOf(msg.sender);
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_burn(msg.sender, amount);
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torn.safeTransfer(msg.sender, amount);
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}
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function rescueExpiredTokens() external {
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require(blockTimestamp() >= expiresAt, "Airdrop redeem period has not ended yet");
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torn.safeTransfer(governance, torn.balanceOf(address(this)));
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}
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function _beforeTokenTransfer(
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address from,
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address to,
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uint256 amount
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) internal override {
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super._beforeTokenTransfer(from, to, amount);
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require(to == address(0) || from == address(0) || allowedTransferee[from], "ERC20: transfer is not allowed");
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}
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function blockTimestamp() public view virtual returns (uint256) {
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return block.timestamp;
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}
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}
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