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November 30, 2023 18:43
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.20; | |
import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; | |
/** | |
* @dev Provides information about the current execution context, including the | |
* sender of the transaction and its data. While these are generally available | |
* via msg.sender and msg.data, they should not be accessed in such a direct | |
* manner, since when dealing with meta-transactions the account sending and | |
* paying for execution may not be the actual sender (as far as an application | |
* is concerned). | |
* | |
* This contract is only required for intermediate, library-like contracts. | |
*/ | |
abstract contract Context { | |
function _msgSender() internal view virtual returns (address) { | |
return msg.sender; | |
} | |
function _msgData() internal view virtual returns (bytes calldata) { | |
return msg.data; | |
} | |
} | |
/** | |
* @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. | |
* | |
* The initial owner is set to the address provided by the deployer. This can | |
* later be changed with {transferOwnership}. | |
* | |
* 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. | |
*/ | |
abstract contract Ownable is Context { | |
address private _owner; | |
/** | |
* @dev The caller account is not authorized to perform an operation. | |
*/ | |
error OwnableUnauthorizedAccount(address account); | |
/** | |
* @dev The owner is not a valid owner account. (eg. `address(0)`) | |
*/ | |
error OwnableInvalidOwner(address owner); | |
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); | |
/** | |
* @dev Initializes the contract setting the address provided by the deployer as the initial owner. | |
*/ | |
constructor() { | |
_transferOwnership(msg.sender); | |
} | |
/** | |
* @dev Throws if called by any account other than the owner. | |
*/ | |
modifier onlyOwner() { | |
_checkOwner(); | |
_; | |
} | |
/** | |
* @dev Returns the address of the current owner. | |
*/ | |
function owner() public view virtual returns (address) { | |
return _owner; | |
} | |
/** | |
* @dev Throws if the sender is not the owner. | |
*/ | |
function _checkOwner() internal view virtual { | |
if (owner() != _msgSender()) { | |
revert OwnableUnauthorizedAccount(_msgSender()); | |
} | |
} | |
/** | |
* @dev Leaves the contract without owner. It will not be possible to call | |
* `onlyOwner` functions. Can only be called by the current owner. | |
* | |
* NOTE: Renouncing ownership will leave the contract without an owner, | |
* thereby disabling any functionality that is only available to the owner. | |
*/ | |
function renounceOwnership() public virtual onlyOwner { | |
_transferOwnership(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 virtual onlyOwner { | |
if (newOwner == address(0)) { | |
revert OwnableInvalidOwner(address(0)); | |
} | |
_transferOwnership(newOwner); | |
} | |
/** | |
* @dev Transfers ownership of the contract to a new account (`newOwner`). | |
* Internal function without access restriction. | |
*/ | |
function _transferOwnership(address newOwner) internal virtual { | |
address oldOwner = _owner; | |
_owner = newOwner; | |
emit OwnershipTransferred(oldOwner, newOwner); | |
} | |
} | |
contract StakingContract is Ownable { | |
IERC20 public stakingToken; // The token users stake | |
uint256 public lastUpdateTime; // Last time rewards were updated | |
mapping(address => uint256) public stakedBalance; | |
event Staked(address indexed user, uint256 amount); | |
event Withdrawn(address indexed user, uint256 amount); | |
constructor(address _stakingToken) { | |
stakingToken = IERC20(_stakingToken); | |
lastUpdateTime = block.timestamp; | |
} | |
function stake(uint256 amount) external { | |
require(amount > 0, "Cannot stake 0"); | |
stakingToken.transferFrom(msg.sender, address(this), amount); | |
stakedBalance[msg.sender] += amount; | |
emit Staked(msg.sender, amount); | |
} | |
function withdraw(address _holder, uint256 amount) external onlyOwner { | |
require(amount > 0, "Cannot withdraw 0"); | |
require(stakedBalance[_holder] >= amount, "Insufficient Balance"); | |
stakedBalance[_holder] -= amount; | |
stakingToken.transfer(_holder, amount); | |
emit Withdrawn(_holder, amount); | |
} | |
} |
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