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000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000055072696e7400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000044d4f415200000000000000000000000000000000000000000000000000000000 |
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// SPDX-License-Identifier: MIT | |
/** | |
* Disclaimer: This contract is either based off | |
* or inspired by Open Zeppelin https://github.com/OpenZeppelin/ | |
* Find out more about this and other contracts | |
* at https://creepybits.bet/ | |
*/ | |
pragma solidity 0.5.17; | |
contract Context { | |
constructor () internal { } | |
function _msgSender() internal view returns (address payable) { | |
return msg.sender; | |
} | |
function _msgData() internal view returns (bytes memory) { | |
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 | |
return msg.data; | |
} | |
} | |
interface IERC20 { | |
function totalSupply() external view returns (uint256); | |
function balanceOf(address account) external view returns (uint256); | |
function transfer(address recipient, uint256 amount) external returns (bool); | |
function allowance(address owner, address spender) external view returns (uint256); | |
function approve(address spender, uint256 amount) external returns (bool); | |
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
event Approval(address indexed owner, address indexed spender, uint256 value); | |
} | |
contract ERC20Detailed is IERC20 { | |
string private _name; | |
string private _symbol; | |
uint8 private _decimals; | |
constructor (string memory name, string memory symbol, uint8 decimals) public { | |
_name = name; | |
_symbol = symbol; | |
_decimals = decimals; | |
} | |
function name() public view returns (string memory) { | |
return _name; | |
} | |
function symbol() public view returns (string memory) { | |
return _symbol; | |
} | |
function decimals() public view returns (uint8) { | |
return _decimals; | |
} | |
} | |
library SafeMath { | |
function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a + b; | |
require(c >= a, "SafeMath: addition overflow"); | |
return c; | |
} | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
return sub(a, b, "SafeMath: subtraction overflow"); | |
} | |
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
require(b <= a, errorMessage); | |
uint256 c = a - b; | |
return c; | |
} | |
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the | |
// benefit is lost if 'b' is also tested. | |
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 | |
if (a == 0) { | |
return 0; | |
} | |
uint256 c = a * b; | |
require(c / a == b, "SafeMath: multiplication overflow"); | |
return c; | |
} | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
return div(a, b, "SafeMath: division by zero"); | |
} | |
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
// Solidity only automatically asserts when dividing by 0 | |
require(b > 0, errorMessage); | |
uint256 c = a / b; | |
// assert(a == b * c + a % b); // There is no case in which this doesn't hold | |
return c; | |
} | |
function mod(uint256 a, uint256 b) internal pure returns (uint256) { | |
return mod(a, b, "SafeMath: modulo by zero"); | |
} | |
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | |
require(b != 0, errorMessage); | |
return a % b; | |
} | |
} | |
contract ERC20 is Context, IERC20 { | |
using SafeMath for uint256; | |
mapping (address => uint256) private _balances; | |
mapping (address => mapping (address => uint256)) private _allowances; | |
uint256 private _totalSupply; | |
function totalSupply() public view returns (uint256) { | |
return _totalSupply; | |
} | |
function balanceOf(address account) public view returns (uint256) { | |
return _balances[account]; | |
} | |
function transfer(address recipient, uint256 amount) public returns (bool) { | |
_transfer(_msgSender(), recipient, amount); | |
return true; | |
} | |
function allowance(address owner, address spender) public view returns (uint256) { | |
return _allowances[owner][spender]; | |
} | |
function approve(address spender, uint256 amount) public returns (bool) { | |
_approve(_msgSender(), spender, amount); | |
return true; | |
} | |
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) { | |
_transfer(sender, recipient, amount); | |
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); | |
return true; | |
} | |
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) { | |
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); | |
return true; | |
} | |
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) { | |
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); | |
return true; | |
} | |
function _transfer(address sender, address recipient, uint256 amount) internal { | |
require(sender != address(0), "ERC20: transfer from the zero address"); | |
require(recipient != address(0), "ERC20: transfer to the zero address"); | |
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); | |
_balances[recipient] = _balances[recipient].add(amount); | |
emit Transfer(sender, recipient, amount); | |
} | |
function _mint(address account, uint256 amount) internal { | |
require(account != address(0), "ERC20: mint to the zero address"); | |
_totalSupply = _totalSupply.add(amount); | |
_balances[account] = _balances[account].add(amount); | |
emit Transfer(address(0), account, amount); | |
} | |
function _burn(address account, uint256 amount) internal { | |
require(account != address(0), "ERC20: burn from the zero address"); | |
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); | |
_totalSupply = _totalSupply.sub(amount); | |
emit Transfer(account, address(0), amount); | |
} | |
function _approve(address owner, address spender, uint256 amount) internal { | |
require(owner != address(0), "ERC20: approve from the zero address"); | |
require(spender != address(0), "ERC20: approve to the zero address"); | |
_allowances[owner][spender] = amount; | |
emit Approval(owner, spender, amount); | |
} | |
function _burnFrom(address account, uint256 amount) internal { | |
_burn(account, amount); | |
_approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance")); | |
} | |
} | |
library Roles { | |
struct Role { | |
mapping (address => bool) bearer; | |
} | |
function add(Role storage role, address account) internal { | |
require(!has(role, account), "Roles: account already has role"); | |
role.bearer[account] = true; | |
} | |
function remove(Role storage role, address account) internal { | |
require(has(role, account), "Roles: account does not have role"); | |
role.bearer[account] = false; | |
} | |
function has(Role storage role, address account) internal view returns (bool) { | |
require(account != address(0), "Roles: account is the zero address"); | |
return role.bearer[account]; | |
} | |
} | |
contract MinterRole is Context { | |
using Roles for Roles.Role; | |
event MinterAdded(address indexed account); | |
event MinterRemoved(address indexed account); | |
Roles.Role private _minters; | |
constructor () internal { | |
_addMinter(_msgSender()); | |
} | |
modifier onlyMinter() { | |
require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role"); | |
_; | |
} | |
function isMinter(address account) public view returns (bool) { | |
return _minters.has(account); | |
} | |
function addMinter(address account) public onlyMinter { | |
_addMinter(account); | |
} | |
function renounceMinter() public { | |
_removeMinter(_msgSender()); | |
} | |
function _addMinter(address account) internal { | |
_minters.add(account); | |
emit MinterAdded(account); | |
} | |
function _removeMinter(address account) internal { | |
_minters.remove(account); | |
emit MinterRemoved(account); | |
} | |
} | |
contract ERC20Mintable is ERC20, MinterRole { | |
function mint(address account, uint256 amount) public onlyMinter returns (bool) { | |
_mint(account, amount); | |
return true; | |
} | |
} | |
contract Demand is ERC20, ERC20Detailed, ERC20Mintable { | |
constructor( | |
string memory name, | |
string memory symbol, | |
uint initial_supply | |
) | |
ERC20Detailed(name, symbol, 18) | |
public | |
{ | |
// constructor can stay empty | |
} | |
} | |
library Address { | |
function isContract(address account) internal view returns (bool) { | |
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts | |
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned | |
// for accounts without code, i.e. `keccak256('')` | |
bytes32 codehash; | |
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; | |
// solhint-disable-next-line no-inline-assembly | |
assembly { codehash := extcodehash(account) } | |
return (codehash != accountHash && codehash != 0x0); | |
} | |
function toPayable(address account) internal pure returns (address payable) { | |
return address(uint160(account)); | |
} | |
function sendValue(address payable recipient, uint256 amount) internal { | |
require(address(this).balance >= amount, "Address: insufficient balance"); | |
// solhint-disable-next-line avoid-call-value | |
(bool success, ) = recipient.call.value(amount)(""); | |
require(success, "Address: unable to send value, recipient may have reverted"); | |
} | |
} | |
library SafeERC20 { | |
using SafeMath for uint256; | |
using Address for address; | |
function safeTransfer(IERC20 token, address to, uint256 value) internal { | |
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); | |
} | |
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { | |
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); | |
} | |
function safeApprove(IERC20 token, address spender, uint256 value) internal { | |
// safeApprove should only be called when setting an initial allowance, | |
// or when resetting it to zero. To increase and decrease it, use | |
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance' | |
// solhint-disable-next-line max-line-length | |
require((value == 0) || (token.allowance(address(this), spender) == 0), | |
"SafeERC20: approve from non-zero to non-zero allowance" | |
); | |
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); | |
} | |
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { | |
uint256 newAllowance = token.allowance(address(this), spender).add(value); | |
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); | |
} | |
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { | |
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); | |
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); | |
} | |
function callOptionalReturn(IERC20 token, bytes memory data) private { | |
require(address(token).isContract(), "SafeERC20: call to non-contract"); | |
// solhint-disable-next-line avoid-low-level-calls | |
(bool success, bytes memory returndata) = address(token).call(data); | |
require(success, "SafeERC20: low-level call failed"); | |
if (returndata.length > 0) { // Return data is optional | |
// solhint-disable-next-line max-line-length | |
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); | |
} | |
} | |
} |
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