Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;
import "./IERC20.sol";
import "./IETHPool.sol";
import "./IStrongPool.sol";
import "./PlatformFees.sol";
import "./ReentrancyGuard.sol";
import "./SafeMath.sol";
contract ETHPoolV3 is IETHPool, IStrongPool, ReentrancyGuard, PlatformFees {
using SafeMath for uint256;
bool public initialized;
uint256 public epochId;
uint256 public totalStaked;
mapping(address => bool) public poolContracts;
mapping(uint256 => address) public stakeOwner;
mapping(uint256 => uint256) public stakeAmount;
mapping(uint256 => uint256) public stakeTimestamp;
mapping(uint256 => bool) public stakeStatus;
uint256 private stakeId;
IERC20 private strongTokenContract;
mapping(address => mapping(uint256 => uint256)) private _ownerIdIndex;
mapping(address => uint256[]) private _ownerIds;
event FallBackLog(address sender, uint256 value);
event PaymentProcessed(address receiver, uint256 amount);
function init(
address strongAddress_,
uint256 stakeFeeNumerator_,
uint256 stakeFeeDenominator_,
uint256 unstakeFeeNumerator_,
uint256 unstakeFeeDenominator_,
uint256 minStakeAmount_,
uint256 stakeTxLimit_,
address payable feeWallet_,
address serviceAdmin_
) external {
require(!initialized, "ETH2.0Pool: init done");
PlatformFees.init(
stakeFeeNumerator_,
stakeFeeDenominator_,
unstakeFeeNumerator_,
unstakeFeeDenominator_,
minStakeAmount_,
stakeTxLimit_,
feeWallet_,
serviceAdmin_
);
ReentrancyGuard.init();
epochId = 1;
stakeId = 1;
strongTokenContract = IERC20(strongAddress_);
initialized = true;
}
function stake(uint256 amount_) external payable nonReentrant override {
require(amount_.mul(stakeFeeNumerator).div(stakeFeeDenominator) == msg.value, "ETH2.0Pool: Value can not be greater or less than staking fee");
stake_(amount_, msg.sender);
require(strongTokenContract.transferFrom(msg.sender, address(this), amount_), "ETH2.0Pool: Insufficient funds");
processPayment(feeWallet, msg.value);
}
function mineFor(address userAddress_, uint256 amount_) external override {
require(poolContracts[msg.sender], "ETH2.0Pool: Caller not authorised to call this function");
stake_(amount_, userAddress_);
require(strongTokenContract.transferFrom(msg.sender, address(this), amount_), "ETH2.0Pool: Insufficient funds");
}
function unStake(uint256[] memory stakeIds_) external payable nonReentrant override {
require(stakeIds_.length <= stakeTxLimit, "ETH2.0Pool: Input array length is greater than approved length");
uint256 userTokens = 0;
for (uint256 i = 0; i < stakeIds_.length; i++) {
require(stakeOwner[stakeIds_[i]] == msg.sender, "ETH2.0Pool: Only owner can unstake");
require(stakeStatus[stakeIds_[i]], "ETH2.0Pool: Transaction already unStaked");
stakeStatus[stakeIds_[i]] = false;
userTokens = userTokens.add(stakeAmount[stakeIds_[i]]);
if (_ownerIdExists(msg.sender, stakeIds_[i])) {
_deleteOwnerId(msg.sender, stakeIds_[i]);
}
emit Unstaked(msg.sender, stakeIds_[i], stakeAmount[stakeIds_[i]], block.timestamp);
}
if (userTokens.mul(unstakeFeeNumerator).div(unstakeFeeDenominator) != msg.value) {
revert("ETH2.0Pool: Value can not be greater or less than unstaking fee");
}
totalStaked = totalStaked.sub(userTokens);
require(strongTokenContract.transfer(msg.sender, userTokens), "ETH2.0Pool: Insufficient Strong tokens");
processPayment(feeWallet, userTokens.mul(unstakeFeeNumerator).div(unstakeFeeDenominator));
}
function stake_(uint256 amount_, address userAddress_) internal {
require(_ownerIds[userAddress_].length < stakeTxLimit, "ETH2.0Pool: User can not exceed stake tx limit");
require(amount_ >= minStakeAmount, "ETH2.0Pool: Amount can not be less than minimum staking amount");
require(userAddress_ != address(0), "ETH2.0Pool: Invalid user address");
stakeOwner[stakeId] = userAddress_;
stakeAmount[stakeId] = amount_;
stakeTimestamp[stakeId] = block.timestamp;
stakeStatus[stakeId] = true;
totalStaked = totalStaked.add(amount_);
if (!_ownerIdExists(userAddress_, stakeId)) {
_addOwnerId(userAddress_, stakeId);
}
emit Staked(userAddress_,stakeId, amount_, block.timestamp);
incrementStakeId();
}
function addVerifiedContract(address contractAddress_) external anyAdmin {
require(contractAddress_ != address(0), "ETH2.0Pool: Invalid contract address");
poolContracts[contractAddress_] = true;
}
function removeVerifiedContract(address contractAddress_) external anyAdmin {
require(poolContracts[contractAddress_], "ETH2.0Pool: Contract address not verified");
poolContracts[contractAddress_] = false;
}
function getUserIds(address user_) external view returns (uint256[] memory) {
return _ownerIds[user_];
}
function getUserIdIndex(address user_, uint256 id_) external view returns (uint256) {
return _ownerIdIndex[user_][id_];
}
// function to transfer eth to recipient account.
function processPayment(address payable recipient_, uint256 amount_) private {
(bool sent,) = recipient_.call{value : amount_}("");
require(sent, "ETH2.0Pool: Failed to send Ether");
emit PaymentProcessed(recipient_, amount_);
}
// function to increment the id counter of Staking entries
function incrementStakeId() private {
stakeId = stakeId.add(1);
}
function _deleteOwnerId(address owner_, uint256 id_) internal {
uint256 lastIndex = _ownerIds[owner_].length.sub(1);
uint256 lastId = _ownerIds[owner_][lastIndex];
if (id_ == lastId) {
_ownerIdIndex[owner_][id_] = 0;
_ownerIds[owner_].pop();
} else {
uint256 indexOfId = _ownerIdIndex[owner_][id_];
_ownerIdIndex[owner_][id_] = 0;
_ownerIds[owner_][indexOfId] = lastId;
_ownerIdIndex[owner_][lastId] = indexOfId;
_ownerIds[owner_].pop();
}
}
function _addOwnerId(address owner, uint256 id) internal {
uint256 len = _ownerIds[owner].length;
_ownerIdIndex[owner][id] = len;
_ownerIds[owner].push(id);
}
function _ownerIdExists(address owner, uint256 id) internal view returns (bool) {
if (_ownerIds[owner].length == 0) return false;
uint256 index = _ownerIdIndex[owner][id];
return id == _ownerIds[owner][index];
}
function setTokenContract(IERC20 tokenAddress) external onlyOwner {
strongTokenContract = tokenAddress;
}
function withdrawToken(IERC20 token, address recipient, uint256 amount) external onlyOwner {
require(token.transfer(recipient, amount));
}
fallback() external payable {
emit FallBackLog(msg.sender, msg.value);
}
receive() external nonReentrant payable {
processPayment(feeWallet, msg.value);
emit FallBackLog(msg.sender, msg.value);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IETHPool {
event Staked(address user, uint256 stakeId, uint256 amount, uint256 timestamp);
event Unstaked(address user, uint256 stakeId, uint256 amount, uint256 timestamp);
function stake(uint256 amount) external payable;
function unStake(uint256[] memory stakeIds) external payable;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IStrongPool {
function mineFor(address miner, uint256 amount) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^ 0.8.0;
import "./Ownable.sol";
import "./IPlatformFees.sol";
contract PlatformFees is Ownable, IPlatformFees {
uint256 public stakeFeeNumerator;
uint256 public stakeFeeDenominator;
uint256 public unstakeFeeNumerator;
uint256 public unstakeFeeDenominator;
uint256 public minStakeAmount;
uint256 public stakeTxLimit;
address payable public feeWallet;
bool private initDone;
function init(
uint256 stakeFeeNumerator_,
uint256 stakeFeeDenominator_,
uint256 unstakeFeeNumerator_,
uint256 unstakeFeeDenominator_,
uint256 minStakeAmount_,
uint256 stakeTxLimit_,
address payable feeWallet_,
address serviceAdmin
) internal {
require(!initDone, "PlatformFee: init done");
stakeFeeNumerator = stakeFeeNumerator_;
stakeFeeDenominator = stakeFeeDenominator_;
unstakeFeeNumerator = unstakeFeeNumerator_;
unstakeFeeDenominator = unstakeFeeDenominator_;
minStakeAmount = minStakeAmount_;
stakeTxLimit = stakeTxLimit_;
feeWallet = feeWallet_;
Ownable.init(serviceAdmin);
initDone = true;
}
function setStakeFeeNumerator(uint256 numerator_) external override anyAdmin {
stakeFeeNumerator = numerator_;
}
function setStakeFeeDenominator(uint256 denominator_) external override anyAdmin {
require(denominator_ > 0, "PlatformFee: denominator can not be zero");
stakeFeeDenominator = denominator_;
}
function setUnstakeFeeNumerator(uint256 numerator_) external override anyAdmin {
unstakeFeeNumerator = numerator_;
}
function setUnstakeFeeDenominator(uint256 denominator_) external override anyAdmin {
require(denominator_ > 0, "PlatformFee: denominator can not be zero");
unstakeFeeDenominator = denominator_;
}
function setMinStakeAmount(uint256 amount_) external override anyAdmin {
require(amount_ > 0, "PlatformFee: amount can not be zero");
minStakeAmount = amount_;
}
function setStakeTxLimit(uint256 limit_) external override anyAdmin {
require(limit_ > 0, "PlatformFee: limit can not zero");
stakeTxLimit = limit_;
}
function setFeeWallet(address payable feeWallet_) external override anyAdmin {
require(feeWallet_ != address(0), "PlatformFee: address can not be zero address");
feeWallet = feeWallet_;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
bool private init_;
function init()internal{
require(!init_, "ReentrancyGuard: init done");
_status = _NOT_ENTERED;
init_ = true;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./Context.sol";
/**
* @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.
*
* By default, the owner account will be the one that deploys the contract. 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;
address private _serviceAdmin;
bool private initialized;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
event NewServiceAdmin(address indexed previousServiceAdmin, address indexed newServiceAdmin);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
function init(address serviceAdmin_) internal {
require(!initialized, "Ownable: init done");
_setOwner(_msgSender());
_setServiceAdmin(serviceAdmin_);
initialized = true;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Returns the address of the current service admin.
*/
function serviceAdmin() public view virtual returns (address) {
return _serviceAdmin;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Throws if called by any account other than the service Admin.
*/
modifier onlyServiceAdmin() {
require(serviceAdmin() == _msgSender(), "Ownable: caller is not the serviceAdmin");
_;
}
modifier anyAdmin(){
require(serviceAdmin() == _msgSender() || owner() == _msgSender(), "Ownable: Caller is not authorized");
_;
}
/**
* @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() external virtual onlyOwner {
_setOwner(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) external virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
function _setServiceAdmin(address newServiceAdmin) private {
address oldServiceAdmin = _serviceAdmin;
_serviceAdmin = newServiceAdmin;
emit NewServiceAdmin(oldServiceAdmin, newServiceAdmin);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IPlatformFees {
function setStakeFeeNumerator(uint256 numerator_) external;
function setStakeFeeDenominator(uint256 denominator_) external;
function setUnstakeFeeNumerator(uint256 numerator_) external;
function setUnstakeFeeDenominator(uint256 denominator_) external;
function setMinStakeAmount(uint256 _amount) external;
function setStakeTxLimit(uint256 limit_) external;
function setFeeWallet(address payable feeWallet_) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @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;
}
}