Contract
0x32e5594f14de658b0d577d6560fa0d9c6f1aa724
1
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Minimal Proxy Contract for 0x62ff5be795262999fc1ebac29277575031d2da2c
Contract Name:
NyanRewards
Compiler Version
v0.8.7+commit.e28d00a7
Contract Source Code (Solidity)
/** *Submitted for verification at Arbiscan on 2021-09-08 */ //SPDX-License-Identifier: MIT // File: @openzeppelin/contracts/ownership/Ownable.sol pragma solidity ^0.8.7; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable { address public owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); constructor() { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner, "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public onlyOwner { emit OwnershipTransferred(owner, address(0)); owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(owner, newOwner); owner = newOwner; } } 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 StakedTokenWrapper { uint256 public totalSupply; mapping(address => uint256) private _balances; IERC20 public stakedToken; event Staked(address indexed user, uint256 amount); event Withdrawn(address indexed user, uint256 amount); function balanceOf(address account) public view returns (uint256) { return _balances[account]; } string constant _transferErrorMessage = "staked token transfer failed"; function stakeFor(address forWhom, uint128 amount) public payable virtual { IERC20 st = stakedToken; if(st == IERC20(address(0))) { //eth unchecked { totalSupply += msg.value; _balances[forWhom] += msg.value; } } else { require(msg.value == 0, "non-zero eth"); require(amount > 0, "Cannot stake 0"); require(st.transferFrom(msg.sender, address(this), amount), _transferErrorMessage); unchecked { totalSupply += amount; _balances[forWhom] += amount; } } emit Staked(forWhom, amount); } function withdraw(uint128 amount) public virtual { require(amount <= _balances[msg.sender], "withdraw: balance is lower"); unchecked { _balances[msg.sender] -= amount; totalSupply = totalSupply-amount; } IERC20 st = stakedToken; if(st == IERC20(address(0))) { //eth (bool success, ) = msg.sender.call{value: amount}(""); require(success, "eth transfer failure"); } else { require(stakedToken.transfer(msg.sender, amount), _transferErrorMessage); } emit Withdrawn(msg.sender, amount); } } contract NyanRewards is StakedTokenWrapper, Ownable { IERC20 public rewardToken; uint256 public rewardRate; uint64 public periodFinish; uint64 public lastUpdateTime; uint128 public rewardPerTokenStored; struct UserRewards { uint128 userRewardPerTokenPaid; uint128 rewards; } mapping(address => UserRewards) public userRewards; event RewardAdded(uint256 reward); event RewardPaid(address indexed user, uint256 reward); constructor(IERC20 _rewardToken, IERC20 _stakedToken) { rewardToken = _rewardToken; stakedToken = _stakedToken; } modifier updateReward(address account) { uint128 _rewardPerTokenStored = rewardPerToken(); lastUpdateTime = lastTimeRewardApplicable(); rewardPerTokenStored = _rewardPerTokenStored; userRewards[account].rewards = earned(account); userRewards[account].userRewardPerTokenPaid = _rewardPerTokenStored; _; } function lastTimeRewardApplicable() public view returns (uint64) { uint64 blockTimestamp = uint64(block.timestamp); return blockTimestamp < periodFinish ? blockTimestamp : periodFinish; } function rewardPerToken() public view returns (uint128) { uint256 totalStakedSupply = totalSupply; if (totalStakedSupply == 0) { return rewardPerTokenStored; } unchecked { uint256 rewardDuration = lastTimeRewardApplicable()-lastUpdateTime; return uint128(rewardPerTokenStored + rewardDuration*rewardRate*1e18/totalStakedSupply); } } function earned(address account) public view returns (uint128) { unchecked { return uint128(balanceOf(account)*(rewardPerToken()-userRewards[account].userRewardPerTokenPaid)/1e18 + userRewards[account].rewards); } } function stake(uint128 amount) external payable { stakeFor(msg.sender, amount); } function stakeFor(address forWhom, uint128 amount) public payable override updateReward(forWhom) { super.stakeFor(forWhom, amount); } function withdraw(uint128 amount) public override updateReward(msg.sender) { super.withdraw(amount); } function exit() external { getReward(); withdraw(uint128(balanceOf(msg.sender))); } function getReward() public updateReward(msg.sender) { uint256 reward = earned(msg.sender); if (reward > 0) { userRewards[msg.sender].rewards = 0; require(rewardToken.transfer(msg.sender, reward), "reward transfer failed"); emit RewardPaid(msg.sender, reward); } } function setRewardParams(uint128 reward, uint64 duration) external onlyOwner { unchecked { require(reward > 0); rewardPerTokenStored = rewardPerToken(); uint64 blockTimestamp = uint64(block.timestamp); uint256 maxRewardSupply = rewardToken.balanceOf(address(this)); if(rewardToken == stakedToken) maxRewardSupply -= totalSupply; uint256 leftover = 0; if (blockTimestamp >= periodFinish) { rewardRate = reward/duration; } else { uint256 remaining = periodFinish-blockTimestamp; leftover = remaining*rewardRate; rewardRate = (reward+leftover)/duration; } require(reward+leftover <= maxRewardSupply, "not enough tokens"); lastUpdateTime = blockTimestamp; periodFinish = blockTimestamp+duration; emit RewardAdded(reward); } } function withdrawReward() external onlyOwner { uint256 rewardSupply = rewardToken.balanceOf(address(this)); //ensure funds staked by users can't be transferred out if(rewardToken == stakedToken) rewardSupply -= totalSupply; require(rewardToken.transfer(msg.sender, rewardSupply)); rewardRate = 0; periodFinish = uint64(block.timestamp); } } /* ____ __ __ __ _ / __/__ __ ___ / /_ / / ___ / /_ (_)__ __ _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ / /___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\ /___/ * Synthetix: YFIRewards.sol * * Docs: https://docs.synthetix.io/ * * * MIT License * =========== * * Copyright (c) 2020 Synthetix * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */
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