Contract Name:
DaoStakeContract
Contract Source Code:
File 1 of 1 : DaoStakeContract
pragma solidity ^0.6.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
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);
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @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) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @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 sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @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) {
// 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;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) {
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;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts 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 mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
/*
* @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 GSN 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 payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
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.
*
* 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.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "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 virtual 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 virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor () internal {
_paused = false;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
require(!_paused, "Pausable: paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
require(_paused, "Pausable: not paused");
_;
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
contract DaoStakeContract is Ownable, Pausable {
// Library for safely handling uint256
using SafeMath for uint256;
uint256 ONE_DAY;
uint256 public stakeDays;
uint256 public maxStakedQuantity;
address public phnxContractAddress;
uint256 public ratio;
uint256 public totalStakedTokens;
mapping(address => uint256) public stakerBalance;
mapping(uint256 => StakerData) public stakerData;
struct StakerData {
uint256 altQuantity;
uint256 initiationTimestamp;
uint256 durationTimestamp;
uint256 rewardAmount;
address staker;
}
event StakeCompleted(
uint256 altQuantity,
uint256 initiationTimestamp,
uint256 durationTimestamp,
uint256 rewardAmount,
address staker,
address phnxContractAddress,
address portalAddress
);
event Unstake(
address staker,
address stakedToken,
address portalAddress,
uint256 altQuantity,
uint256 durationTimestamp
); // When ERC20s are withdrawn
event BaseInterestUpdated(uint256 _newRate, uint256 _oldRate);
constructor() public {
ratio = 821917808219178;
phnxContractAddress = 0x38A2fDc11f526Ddd5a607C1F251C065f40fBF2f7;
maxStakedQuantity = 10000000000000000000000;
stakeDays = 365;
ONE_DAY = 60;
}
/* @dev stake function which enable the user to stake PHNX Tokens.
* @param _altQuantity, PHNX amount to be staked.
* @param _days, how many days PHNX tokens are staked for (in days)
*/
function stakeALT(uint256 _altQuantity, uint256 _days)
public
whenNotPaused
returns (uint256 rewardAmount)
{
require(_days <= stakeDays && _days > 0, "Invalid Days"); // To check days
require(
_altQuantity <= maxStakedQuantity && _altQuantity > 0,
"Invalid PHNX quantity"
); // To verify PHNX quantity
IERC20(phnxContractAddress).transferFrom(
msg.sender,
address(this),
_altQuantity
);
rewardAmount = _calculateReward(_altQuantity, ratio, _days);
uint256 _timestamp = block.timestamp;
if (stakerData[_timestamp].staker != address(0)) {
_timestamp = _timestamp.add(1);
}
stakerData[_timestamp] = StakerData(
_altQuantity,
_timestamp,
_days.mul(ONE_DAY),
rewardAmount,
msg.sender
);
stakerBalance[msg.sender] = stakerBalance[msg.sender].add(_altQuantity);
totalStakedTokens = totalStakedTokens.add(_altQuantity);
IERC20(phnxContractAddress).transfer(msg.sender, rewardAmount);
emit StakeCompleted(
_altQuantity,
_timestamp,
_days.mul(ONE_DAY),
rewardAmount,
msg.sender,
phnxContractAddress,
address(this)
);
}
/* @dev unStake function which enable the user to withdraw his PHNX Tokens.
* @param _expiredTimestamps, time when PHNX tokens are unlocked.
* @param _amount, amount to be withdrawn by the user.
*/
function unstakeALT(uint256[] calldata _expiredTimestamps, uint256 _amount)
external
whenNotPaused
returns (uint256)
{
require(_amount > 0, "Amount should be greater than 0");
uint256 withdrawAmount = 0;
uint256 burnAmount = 0;
for (uint256 i = 0; i < _expiredTimestamps.length; i = i.add(1)) {
require(
stakerData[_expiredTimestamps[i]].durationTimestamp != 0,
"Nothing staked"
);
if (
_expiredTimestamps[i].add(
stakerData[_expiredTimestamps[i]].durationTimestamp //if timestamp is not expired
) >= block.timestamp
) {
uint256 _remainingDays = (
stakerData[_expiredTimestamps[i]]
.durationTimestamp
.add(_expiredTimestamps[i])
.sub(block.timestamp)
)
.div(ONE_DAY);
uint256 _totalDays = stakerData[_expiredTimestamps[i]]
.durationTimestamp
.div(ONE_DAY);
if (_amount >= stakerData[_expiredTimestamps[i]].altQuantity) {
uint256 stakeBurn = _calculateBurn(
stakerData[_expiredTimestamps[i]].altQuantity,
_remainingDays,
_totalDays
);
burnAmount = burnAmount.add(stakeBurn);
withdrawAmount = withdrawAmount.add(
stakerData[_expiredTimestamps[i]].altQuantity.sub(
stakeBurn
)
);
_amount = _amount.sub(
stakerData[_expiredTimestamps[i]].altQuantity
);
emit Unstake(
msg.sender,
phnxContractAddress,
address(this),
stakerData[_expiredTimestamps[i]].altQuantity,
_expiredTimestamps[i]
);
stakerData[_expiredTimestamps[i]].altQuantity = 0;
} else if (
(_amount < stakerData[_expiredTimestamps[i]].altQuantity) &&
_amount > 0 // if timestamp is expired
) {
stakerData[_expiredTimestamps[i]]
.altQuantity = stakerData[_expiredTimestamps[i]]
.altQuantity
.sub(_amount);
uint256 stakeBurn = _calculateBurn(
_amount,
_remainingDays,
_totalDays
);
burnAmount = burnAmount.add(stakeBurn);
withdrawAmount = withdrawAmount.add(_amount.sub(stakeBurn));
emit Unstake(
msg.sender,
phnxContractAddress,
address(this),
_amount,
_expiredTimestamps[i]
);
_amount = 0;
}
} else {
if (_amount >= stakerData[_expiredTimestamps[i]].altQuantity) {
_amount = _amount.sub(
stakerData[_expiredTimestamps[i]].altQuantity
);
withdrawAmount = withdrawAmount.add(
stakerData[_expiredTimestamps[i]].altQuantity
);
emit Unstake(
msg.sender,
phnxContractAddress,
address(this),
stakerData[_expiredTimestamps[i]].altQuantity,
_expiredTimestamps[i]
);
stakerData[_expiredTimestamps[i]].altQuantity = 0;
} else if (
(_amount < stakerData[_expiredTimestamps[i]].altQuantity) &&
_amount > 0
) {
stakerData[_expiredTimestamps[i]]
.altQuantity = stakerData[_expiredTimestamps[i]]
.altQuantity
.sub(_amount);
withdrawAmount = withdrawAmount.add(_amount);
emit Unstake(
msg.sender,
phnxContractAddress,
address(this),
_amount,
_expiredTimestamps[i]
);
break;
}
}
}
require(withdrawAmount != 0, "Not Transferred");
if (burnAmount > 0) {
IERC20(phnxContractAddress).transfer(
0x0000000000000000000000000000000000000001,
burnAmount
);
}
stakerBalance[msg.sender] = stakerBalance[msg.sender].sub(
withdrawAmount
);
totalStakedTokens = totalStakedTokens.sub(withdrawAmount);
IERC20(phnxContractAddress).transfer(msg.sender, withdrawAmount);
return withdrawAmount;
}
/* @dev to calculate reward Amount
* @param _altQuantity , amount of ALT tokens staked.
*@param _baseInterest rate
*/
function _calculateReward(
uint256 _altQuantity,
uint256 _ratio,
uint256 _days
) internal pure returns (uint256 rewardAmount) {
rewardAmount = (_altQuantity.mul(_ratio).mul(_days)).div(
1000000000000000000
);
}
/* @dev function to calculate the amount of PHNX token burned incase of early unstake.
*@param _amount, The amount of Tokens user is unstaking.
*@param _remainingDays, remaining time before the tokens will be unlocked.
*@param _totalDays, total days tokens were staked for.
*/
function _calculateBurn(
uint256 _amount,
uint256 _remainingDays,
uint256 _totalDays
) internal pure returns (uint256 burnAmount) {
burnAmount = ((_amount * _remainingDays) / _totalDays);
}
/* @dev to set base interest rate. Can only be called by owner
* @param _rate, interest rate (in wei)
*/
function updateRatio(uint256 _rate) public onlyOwner whenNotPaused {
ratio = _rate;
}
function updateTime(uint256 _time) public onlyOwner whenNotPaused {
ONE_DAY = _time;
}
function updateQuantity(uint256 _quantity) public onlyOwner whenNotPaused {
maxStakedQuantity = _quantity;
}
/* @dev function to update stakeDays.
*@param _stakeDays, updated Days .
*/
function updatestakeDays(uint256 _stakeDays) public onlyOwner {
stakeDays = _stakeDays;
}
/* @dev Funtion to withdraw all PHNX from contract incase of emergency, can only be called by owner.*/
function withdrawTokens() public onlyOwner {
IERC20(phnxContractAddress).transfer(
owner(),
IERC20(phnxContractAddress).balanceOf(address(this))
);
pause();
}
function getTotalrewardTokens() external view returns(uint256){
return IERC20(phnxContractAddress).balanceOf(address(this)).sub(totalStakedTokens);
}
/* @dev function to update Phoenix contract address.
*@param _address, new address of the contract.
*/
function setPheonixContractAddress(address _address) public onlyOwner {
phnxContractAddress = _address;
}
/* @dev function which restricts the user from stakng PHNX tokens. */
function pause() public onlyOwner {
_pause();
}
/* @dev function which disables the Pause function. */
function unPause() public onlyOwner {
_unpause();
}
}