79 lines
2.3 KiB
Solidity
79 lines
2.3 KiB
Solidity
/*
|
|
|
|
Copyright 2020 DODO ZOO.
|
|
SPDX-License-Identifier: Apache-2.0
|
|
|
|
*/
|
|
|
|
pragma solidity 0.6.9;
|
|
|
|
import {SafeMath} from "../../lib/SafeMath.sol";
|
|
|
|
contract TestERC20 {
|
|
using SafeMath for uint256;
|
|
|
|
string public name;
|
|
uint8 public decimals;
|
|
string public symbol;
|
|
|
|
mapping(address => uint256) balances;
|
|
mapping(address => mapping(address => uint256)) internal allowed;
|
|
|
|
event Transfer(address indexed from, address indexed to, uint256 amount);
|
|
event Approval(address indexed owner, address indexed spender, uint256 amount);
|
|
|
|
constructor(
|
|
string memory _name,
|
|
uint8 _decimals,
|
|
string memory _symbol
|
|
) public {
|
|
name = _name;
|
|
decimals = _decimals;
|
|
symbol = _symbol;
|
|
}
|
|
|
|
function transfer(address to, uint256 amount) public returns (bool) {
|
|
require(to != address(0), "TO_ADDRESS_IS_EMPTY");
|
|
require(amount <= balances[msg.sender], "BALANCE_NOT_ENOUGH");
|
|
|
|
balances[msg.sender] = balances[msg.sender].sub(amount);
|
|
balances[to] = balances[to].add(amount);
|
|
emit Transfer(msg.sender, to, amount);
|
|
return true;
|
|
}
|
|
|
|
function balanceOf(address owner) public view returns (uint256 balance) {
|
|
return balances[owner];
|
|
}
|
|
|
|
function transferFrom(
|
|
address from,
|
|
address to,
|
|
uint256 amount
|
|
) public returns (bool) {
|
|
require(to != address(0), "TO_ADDRESS_IS_EMPTY");
|
|
require(amount <= balances[from], "BALANCE_NOT_ENOUGH");
|
|
require(amount <= allowed[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
|
|
|
|
balances[from] = balances[from].sub(amount);
|
|
balances[to] = balances[to].add(amount);
|
|
allowed[from][msg.sender] = allowed[from][msg.sender].sub(amount);
|
|
emit Transfer(from, to, amount);
|
|
return true;
|
|
}
|
|
|
|
function approve(address spender, uint256 amount) public returns (bool) {
|
|
allowed[msg.sender][spender] = amount;
|
|
emit Approval(msg.sender, spender, amount);
|
|
return true;
|
|
}
|
|
|
|
function allowance(address owner, address spender) public view returns (uint256) {
|
|
return allowed[owner][spender];
|
|
}
|
|
|
|
function mint(address account, uint256 amount) external {
|
|
balances[account] = balances[account].add(amount);
|
|
}
|
|
}
|