文件 1 的 1：Swapico.sol
pragma solidity ^0.6.0;
abstract contract IERC20 {
function totalSupply() external virtual view returns (uint256);
function balanceOf(address tokenOwner) external virtual view returns (uint256 balance);
function allowance(address tokenOwner, address spender) external virtual view returns (uint256 remaining);
function transfer(address to, uint256 tokens) external virtual returns (bool success);
function approve(address spender, uint256 tokens) external virtual returns (bool success);
function transferFrom(address from, address to, uint256 tokens) external virtual returns (bool success);
function burnFrom(address account, uint256 amount) public virtual;
event Transfer(address indexed from, address indexed to, uint256 tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint256 tokens);
}
contract Swapico {
address public immutable synthetico;
address public immutable authentico;
uint256 public immutable inicio;
event purchased(address indexed _purchaser, uint256 indexed _tokens);
constructor(address _synthetico, address _authentico, uint256 _inicio) public {
synthetico = _synthetico;
authentico = _authentico;
inicio = _inicio;
}
function purchase(uint256 amount) public {
require(block.timestamp >= inicio, 'purchase: too soon');
require(IERC20(synthetico).balanceOf(address(msg.sender)) >= amount, 'purchase: insufficient balance');
require(IERC20(authentico).balanceOf(address(this)) >= amount, 'purchase: insufficient liquidity');
_purchase(amount);
}
function _purchase(uint256 _amount) internal {
IERC20(synthetico).burnFrom(msg.sender, _amount);
IERC20(authentico).transfer(msg.sender, _amount);
emit purchased(msg.sender, _amount);
}
}{
"compilationTarget": {
"Swapico.sol": "Swapico"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
