// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
interface IERC20 {
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
}
contract Staking {
address public owner;
IERC20 public TKN;
uint256[] public periods = [30 days, 90 days, 150 days];
uint256[] public rates = [106, 121, 140];
uint256 public limit = 20000000000000000000000000;
uint256 public finish_timestamp = 1633046400; // 00:00 1 Oct 2021 UTC
struct Stake {
uint8 class;
uint8 cycle;
uint256 initialAmount;
uint256 finalAmount;
uint256 timestamp;
}
mapping(address => Stake) public stakeOf;
event Staked(address sender, uint8 class, uint256 amount, uint256 finalAmount);
event Prolonged(address sender, uint8 class, uint8 cycle, uint256 newAmount, uint256 newFinalAmount);
event Unstaked(address sender, uint8 class, uint8 cycle, uint256 amount);
function stake(uint8 _class, uint256 _amount) public {
require(_class < 3 && _amount >= 10000000000000000000); // data valid
require(stakeOf[msg.sender].cycle == 0); // not staking currently
require(finish_timestamp > block.timestamp + periods[_class]); // not staking in the end of program
uint256 _finalAmount = _amount * rates[_class] / 100;
limit -= _finalAmount - _amount;
require(TKN.transferFrom(msg.sender, address(this), _amount));
stakeOf[msg.sender] = Stake(_class, 1, _amount, _finalAmount, block.timestamp);
emit Staked(msg.sender, _class, _amount, _finalAmount);
}
function prolong() public {
Stake storage _s = stakeOf[msg.sender];
require(_s.cycle > 0); // staking currently
require(block.timestamp >= _s.timestamp + periods[_s.class]); // staking period finished
require(finish_timestamp > block.timestamp + periods[_s.class]); // not prolonging in the end of program
uint256 _newFinalAmount = _s.finalAmount * rates[_s.class] / 100;
limit -= _newFinalAmount - _s.finalAmount;
_s.timestamp = block.timestamp;
_s.cycle++;
emit Prolonged(msg.sender, _s.class, _s.cycle, _s.finalAmount, _newFinalAmount);
_s.finalAmount = _newFinalAmount;
}
function unstake() public {
Stake storage _s = stakeOf[msg.sender];
require(_s.cycle > 0); // staking currently
require(block.timestamp >= _s.timestamp + periods[_s.class]); // staking period finished
require(TKN.transfer(msg.sender, _s.finalAmount));
emit Unstaked(msg.sender, _s.class, _s.cycle, _s.finalAmount);
delete stakeOf[msg.sender];
}
function transferOwnership(address _owner) public {
require(msg.sender == owner);
owner = _owner;
}
function drain(address _recipient) public {
require(msg.sender == owner);
require(block.timestamp > finish_timestamp); // after 1st Oct
require(TKN.transfer(_recipient, limit));
limit = 0;
}
function drainFull(address _recipient) public {
require(msg.sender == owner);
require(block.timestamp > finish_timestamp + 31 days); // After 1st Nov
uint256 _amount = TKN.balanceOf(address(this));
require(TKN.transfer(_recipient, _amount));
limit = 0;
}
constructor(IERC20 _TKN) {
owner = msg.sender;
TKN = _TKN;
}
}
{
"compilationTarget": {
"CTIS.sol": "Staking"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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