pragma solidity ^ 0.5.0;
library SafeMath {
function add(uint a, uint b) internal pure returns(uint c) {
c = a + b;
require(c >= a);
}
function sub(uint a, uint b) internal pure returns(uint c) {
require(b <= a);
c = a - b;
}
function mul(uint a, uint b) internal pure returns(uint c) {
c = a * b;
require(a == 0 || c / a == b);
}
function div(uint a, uint b) internal pure returns(uint c) {
require(b > 0);
c = a / b;
}
}
//使用ERC20标准
contract ERC20Interface {
function totalSupply() public view returns(uint);
function balanceOf(address tokenOwner) public view returns(uint balance);
function allowance(address tokenOwner, address spender) public view returns(uint remaining);
function transfer(address to, uint tokens) public returns(bool success);
function approve(address spender, uint tokens) public returns(bool success);
function transferFrom(address from, address to, uint tokens) public returns(bool success);
event Transfer(address indexed from, address indexed to, uint tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;
}
//合约owner
contract Owned {
address public owner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) public onlyOwner {
owner = newOwner;
emit OwnershipTransferred(owner, newOwner);
}
}
//冻结所有交易功能
contract Tokenlock is Owned {
uint8 isLocked = 0;
event Freezed();
event UnFreezed();
modifier validLock {
require(isLocked == 0);
_;
}
function freeze() public onlyOwner {
isLocked = 1;
emit Freezed();
}
function unfreeze() public onlyOwner {
isLocked = 0;
emit UnFreezed();
}
}
//黑名单功能
contract UserLock is Owned {
mapping(address => bool) blacklist;
event LockUser(address indexed who);
event UnlockUser(address indexed who);
modifier permissionCheck {
require(!blacklist[msg.sender]);
_;
}
function lockUser(address who) public onlyOwner {
blacklist[who] = true;
emit LockUser(who);
}
function unlockUser(address who) public onlyOwner {
blacklist[who] = false;
emit UnlockUser(who);
}
}
//「需要部署」，创建代币合约
contract submitToken is ERC20Interface, Tokenlock, UserLock {
using SafeMath for uint;
string public symbol;
string public name;
uint8 public decimals;
uint _totalSupply;
mapping(address => uint) balances;
mapping(address => mapping(address => uint256)) public allowed;
constructor() public {
symbol = ‘fcc’;//简写
name = ‘fcc’;//toekn全名
decimals = 18;//小数位数
_totalSupply = 1000000000* 10 ** uint256(decimals);
balances[owner] = _totalSupply;
emit Transfer(address(0), owner, _totalSupply);
}
//查询目前存量（减去销毁）
function totalSupply() public view returns(uint) {
return _totalSupply.sub(balances[address(0)]);
}
//输入地址，查询余额
function balanceOf(address tokenOwner) public view returns(uint balance) {
return balances[tokenOwner];
}
//输入目标地址，金额，进行转账
function transfer(address to, uint tokens) public validLock permissionCheck returns(bool success) {
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
emit Transfer(msg.sender, to, tokens);
return true;
}
//输入委托人地址，输入委托金额，进行委托操作
//「委托人可以自由的动用你的账户中被委托的金额」
function approve(address spender, uint tokens) public validLock permissionCheck returns(bool success)
{
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
//「委托人特权」输入托付者地址，转账地址，转账金额。进行委托转账
//「信任保证」
function transferFrom(address _from, address to, uint tokens) public validLock permissionCheck
returns(bool success) {
balances[_from] = balances[_from].sub(tokens);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
emit Transfer(_from, to, tokens);
return true;
}
//输入托付人地址，委托人地址，查询剩余委托金额
function allowance(address tokenOwner, address spender) public view returns(uint remaining) {
return allowed[tokenOwner][spender];
}
//「销毁操作」销毁自己拥有的，总量也会减少
function burn(uint256 value) public validLock permissionCheck returns(bool success) {
require(msg.sender != address(0));
_totalSupply = _totalSupply.sub(value);
balances[msg.sender] = balances[msg.sender].sub(value);
emit Transfer(msg.sender, address(0), value);
return true;
}
//信任支付
function approveAndCall(address spender, uint tokens, bytes memory data) public validLock
permissionCheck returns(bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
return true;
}
//错误转账回调
function () external payable {
revert();
}
//owner地址支持接受其他ERC20代币
function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns(bool
success) {
return ERC20Interface(tokenAddress).transfer(owner, tokens);
}
}