// File: node_modules\@openzeppelin\contracts\GSN\Context.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/*
* @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 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;
}
}
// File: node_modules\@openzeppelin\contracts\token\ERC20\IERC20.sol
// SPDX-License-Identifier: MIT
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);
}
// File: node_modules\@openzeppelin\contracts\math\SafeMath.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @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;
}
}
// File: node_modules\@openzeppelin\contracts\utils\Address.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File: @openzeppelin\contracts\token\ERC20\ERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// File: @openzeppelin\contracts\math\SafeMath.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
// File: @openzeppelin\contracts\access\Ownable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @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;
}
}
// File: contracts\TokenStake.sol
pragma solidity ^0.6.0;
contract TokenStake is Ownable{
using SafeMath for uint256;
ERC20 public token; // Address of token contract
address public tokenOperator; // Address to manage the Stake
uint256 public maxMigrationBlocks; // Block numbers to complete the migration
mapping (address => uint256) public balances; // Useer Token balance in the contract
uint256 public currentStakeMapIndex; // Current Stake Index to avoid math calc in all methods
struct StakeInfo {
bool exist;
uint256 pendingForApprovalAmount;
uint256 approvedAmount;
uint256 rewardComputeIndex;
mapping (uint256 => uint256) claimableAmount;
}
// Staking period timestamp (Debatable on timestamp vs blocknumber - went with timestamp)
struct StakePeriod {
uint256 startPeriod;
uint256 submissionEndPeriod;
uint256 approvalEndPeriod;
uint256 requestWithdrawStartPeriod;
uint256 endPeriod;
uint256 minStake;
bool openForExternal;
uint256 windowRewardAmount;
}
mapping (uint256 => StakePeriod) public stakeMap;
// List of Stake Holders
address[] stakeHolders;
// All Stake Holders
//mapping(address => mapping(uint256 => StakeInfo)) stakeHolderInfo;
mapping(address => StakeInfo) stakeHolderInfo;
// To store the total stake in a window
uint256 public windowTotalStake;
// Events
event NewOperator(address tokenOperator);
event WithdrawToken(address indexed tokenOperator, uint256 amount);
event OpenForStake(uint256 indexed stakeIndex, address indexed tokenOperator, uint256 startPeriod, uint256 endPeriod, uint256 approvalEndPeriod, uint256 rewardAmount);
event SubmitStake(uint256 indexed stakeIndex, address indexed staker, uint256 stakeAmount);
event RequestForClaim(uint256 indexed stakeIndex, address indexed staker, bool autoRenewal);
event ClaimStake(uint256 indexed stakeIndex, address indexed staker, uint256 totalAmount);
event RejectStake(uint256 indexed stakeIndex, address indexed staker, address indexed tokenOperator, uint256 returnAmount);
event AddReward(address indexed staker, uint256 indexed stakeIndex, address tokenOperator, uint256 totalStakeAmount, uint256 rewardAmount, uint256 windowTotalStake);
event WithdrawStake(uint256 indexed stakeIndex, address indexed staker, uint256 stakeAmount);
// Modifiers
modifier onlyOperator() {
require(
msg.sender == tokenOperator,
"Only operator can call this function."
);
_;
}
// Token Operator should be able to do auto renewal
modifier allowSubmission() {
require(
now >= stakeMap[currentStakeMapIndex].startPeriod &&
now <= stakeMap[currentStakeMapIndex].submissionEndPeriod &&
stakeMap[currentStakeMapIndex].openForExternal == true,
"Staking at this point not allowed"
);
_;
}
modifier validStakeLimit(address staker, uint256 stakeAmount) {
uint256 stakerTotalStake;
stakerTotalStake = stakeAmount.add(stakeHolderInfo[staker].pendingForApprovalAmount);
stakerTotalStake = stakerTotalStake.add(stakeHolderInfo[staker].approvedAmount);
// Check for Min Stake
require(
stakeAmount > 0 &&
stakerTotalStake >= stakeMap[currentStakeMapIndex].minStake,
"Need to have min stake"
);
_;
}
// Check for auto renewal flag update
modifier canRequestForClaim(uint256 stakeMapIndex) {
require(
(stakeHolderInfo[msg.sender].approvedAmount > 0 || stakeHolderInfo[msg.sender].claimableAmount[stakeMapIndex] > 0) &&
now >= stakeMap[stakeMapIndex].requestWithdrawStartPeriod &&
now <= stakeMap[stakeMapIndex].endPeriod,
"Update to auto renewal at this point not allowed"
);
_;
}
// Check for claim - after the end period when opted out OR after grace period when no more stake windows
modifier allowClaimStake(uint256 stakeMapIndex) {
uint256 graceTime;
graceTime = stakeMap[stakeMapIndex].endPeriod.sub(stakeMap[stakeMapIndex].requestWithdrawStartPeriod);
require(
(now > stakeMap[stakeMapIndex].endPeriod && stakeHolderInfo[msg.sender].claimableAmount[stakeMapIndex] > 0) ||
(now > stakeMap[stakeMapIndex].endPeriod.add(graceTime) && stakeHolderInfo[msg.sender].approvedAmount > 0), "Invalid claim request"
);
_;
}
constructor(address _token, uint256 _maxMigrationBlocks)
public
{
token = ERC20(_token);
tokenOperator = msg.sender;
currentStakeMapIndex = 0;
windowTotalStake = 0;
maxMigrationBlocks = _maxMigrationBlocks.add(block.number);
}
function updateOperator(address newOperator) public onlyOwner {
require(newOperator != address(0), "Invalid operator address");
tokenOperator = newOperator;
emit NewOperator(newOperator);
}
function withdrawToken(uint256 value) public onlyOperator
{
// Check if contract is having required balance
require(token.balanceOf(address(this)) >= value, "Not enough balance in the contract");
require(token.transfer(msg.sender, value), "Unable to transfer token to the operator account");
emit WithdrawToken(tokenOperator, value);
}
function openForStake(uint256 _startPeriod, uint256 _submissionEndPeriod, uint256 _approvalEndPeriod, uint256 _requestWithdrawStartPeriod, uint256 _endPeriod, uint256 _windowRewardAmount, uint256 _minStake, bool _openForExternal) public onlyOperator {
// Check Input Parameters
require(_startPeriod >= now && _startPeriod < _submissionEndPeriod && _submissionEndPeriod < _approvalEndPeriod && _approvalEndPeriod < _requestWithdrawStartPeriod && _requestWithdrawStartPeriod < _endPeriod, "Invalid stake period");
require(_windowRewardAmount > 0 && _minStake > 0, "Invalid inputs" );
// Check Stake in Progress
require(currentStakeMapIndex == 0 || (now > stakeMap[currentStakeMapIndex].approvalEndPeriod && _startPeriod >= stakeMap[currentStakeMapIndex].requestWithdrawStartPeriod), "Cannot have more than one stake request at a time");
// Move the staking period to next one
currentStakeMapIndex = currentStakeMapIndex + 1;
StakePeriod memory stakePeriod;
// Set Staking attributes
stakePeriod.startPeriod = _startPeriod;
stakePeriod.submissionEndPeriod = _submissionEndPeriod;
stakePeriod.approvalEndPeriod = _approvalEndPeriod;
stakePeriod.requestWithdrawStartPeriod = _requestWithdrawStartPeriod;
stakePeriod.endPeriod = _endPeriod;
stakePeriod.windowRewardAmount = _windowRewardAmount;
stakePeriod.minStake = _minStake;
stakePeriod.openForExternal = _openForExternal;
stakeMap[currentStakeMapIndex] = stakePeriod;
// Add the current window reward to the window total stake
windowTotalStake = windowTotalStake.add(_windowRewardAmount);
emit OpenForStake(currentStakeMapIndex, msg.sender, _startPeriod, _endPeriod, _approvalEndPeriod, _windowRewardAmount);
}
// To add the Stake Holder
function _createStake(address staker, uint256 stakeAmount) internal returns(bool) {
StakeInfo storage stakeInfo = stakeHolderInfo[staker];
// Check if the user already staked in the past
if(stakeInfo.exist) {
stakeInfo.pendingForApprovalAmount = stakeInfo.pendingForApprovalAmount.add(stakeAmount);
} else {
StakeInfo memory req;
// Create a new stake request
req.exist = true;
req.pendingForApprovalAmount = stakeAmount;
req.approvedAmount = 0;
req.rewardComputeIndex = 0;
// Add to the Stake Holders List
stakeHolderInfo[staker] = req;
// Add to the Stake Holders List
stakeHolders.push(staker);
}
return true;
}
// To submit a new stake for the current window
function submitStake(uint256 stakeAmount) public allowSubmission validStakeLimit(msg.sender, stakeAmount) {
// Transfer the Tokens to Contract
require(token.transferFrom(msg.sender, address(this), stakeAmount), "Unable to transfer token to the contract");
_createStake(msg.sender, stakeAmount);
// Update the User balance
balances[msg.sender] = balances[msg.sender].add(stakeAmount);
// Update current stake period total stake - For Auto Approvals
windowTotalStake = windowTotalStake.add(stakeAmount);
emit SubmitStake(currentStakeMapIndex, msg.sender, stakeAmount);
}
// To withdraw stake during submission phase
function withdrawStake(uint256 stakeMapIndex, uint256 stakeAmount) public {
require(
(now >= stakeMap[stakeMapIndex].startPeriod && now <= stakeMap[stakeMapIndex].submissionEndPeriod),
"Stake withdraw at this point is not allowed"
);
StakeInfo storage stakeInfo = stakeHolderInfo[msg.sender];
// Validate the input Stake Amount
require(stakeAmount > 0 &&
stakeInfo.pendingForApprovalAmount >= stakeAmount,
"Cannot withdraw beyond stake amount");
// Allow withdaw not less than minStake or Full Amount
require(
stakeInfo.pendingForApprovalAmount.sub(stakeAmount) >= stakeMap[stakeMapIndex].minStake ||
stakeInfo.pendingForApprovalAmount == stakeAmount,
"Can withdraw full amount or partial amount maintaining min stake"
);
// Update the staker balance in the staking window
stakeInfo.pendingForApprovalAmount = stakeInfo.pendingForApprovalAmount.sub(stakeAmount);
// Update the User balance
balances[msg.sender] = balances[msg.sender].sub(stakeAmount);
// Update current stake period total stake - For Auto Approvals
windowTotalStake = windowTotalStake.sub(stakeAmount);
// Return to User Wallet
require(token.transfer(msg.sender, stakeAmount), "Unable to transfer token to the account");
emit WithdrawStake(stakeMapIndex, msg.sender, stakeAmount);
}
// Reject the stake in the Current Window
function rejectStake(uint256 stakeMapIndex, address staker) public onlyOperator {
// Allow for rejection after approval period as well
require(now > stakeMap[stakeMapIndex].submissionEndPeriod && currentStakeMapIndex == stakeMapIndex, "Rejection at this point is not allowed");
StakeInfo storage stakeInfo = stakeHolderInfo[staker];
// In case of if there are auto renewals reject should not be allowed
require(stakeInfo.pendingForApprovalAmount > 0, "No staking request found");
uint256 returnAmount;
returnAmount = stakeInfo.pendingForApprovalAmount;
// transfer back the stake to user account
require(token.transfer(staker, stakeInfo.pendingForApprovalAmount), "Unable to transfer token back to the account");
// Update the User Balance
balances[staker] = balances[staker].sub(stakeInfo.pendingForApprovalAmount);
// Update current stake period total stake - For Auto Approvals
windowTotalStake = windowTotalStake.sub(stakeInfo.pendingForApprovalAmount);
// Update the Pending Amount
stakeInfo.pendingForApprovalAmount = 0;
emit RejectStake(stakeMapIndex, staker, msg.sender, returnAmount);
}
// To update the Auto Renewal - OptIn or OptOut for next stake window
function requestForClaim(uint256 stakeMapIndex, bool autoRenewal) public canRequestForClaim(stakeMapIndex) {
StakeInfo storage stakeInfo = stakeHolderInfo[msg.sender];
// Check for the claim amount
require((autoRenewal == true && stakeInfo.claimableAmount[stakeMapIndex] > 0) || (autoRenewal == false && stakeInfo.approvedAmount > 0), "Invalid auto renew request");
if(autoRenewal) {
// Update current stake period total stake - For Auto Approvals
windowTotalStake = windowTotalStake.add(stakeInfo.claimableAmount[stakeMapIndex]);
stakeInfo.approvedAmount = stakeInfo.claimableAmount[stakeMapIndex];
stakeInfo.claimableAmount[stakeMapIndex] = 0;
} else {
// Update current stake period total stake - For Auto Approvals
windowTotalStake = windowTotalStake.sub(stakeInfo.approvedAmount);
stakeInfo.claimableAmount[stakeMapIndex] = stakeInfo.approvedAmount;
stakeInfo.approvedAmount = 0;
}
emit RequestForClaim(stakeMapIndex, msg.sender, autoRenewal);
}
function _calculateRewardAmount(uint256 stakeMapIndex, uint256 stakeAmount) internal view returns(uint256) {
uint256 calcRewardAmount;
calcRewardAmount = stakeAmount.mul(stakeMap[stakeMapIndex].windowRewardAmount).div(windowTotalStake.sub(stakeMap[stakeMapIndex].windowRewardAmount));
return calcRewardAmount;
}
// Update reward for staker in the respective stake window
function computeAndAddReward(uint256 stakeMapIndex, address staker)
public
onlyOperator
returns(bool)
{
// Check for the Incubation Period
require(
now > stakeMap[stakeMapIndex].approvalEndPeriod &&
now < stakeMap[stakeMapIndex].requestWithdrawStartPeriod,
"Reward cannot be added now"
);
StakeInfo storage stakeInfo = stakeHolderInfo[staker];
// Check if reward already computed
require((stakeInfo.approvedAmount > 0 || stakeInfo.pendingForApprovalAmount > 0 ) && stakeInfo.rewardComputeIndex != stakeMapIndex, "Invalid reward request");
// Calculate the totalAmount
uint256 totalAmount;
uint256 rewardAmount;
// Calculate the reward amount for the current window - Need to consider pendingForApprovalAmount for Auto Approvals
totalAmount = stakeInfo.approvedAmount.add(stakeInfo.pendingForApprovalAmount);
rewardAmount = _calculateRewardAmount(stakeMapIndex, totalAmount);
totalAmount = totalAmount.add(rewardAmount);
// Add the reward amount and update pendingForApprovalAmount
stakeInfo.approvedAmount = totalAmount;
stakeInfo.pendingForApprovalAmount = 0;
// Update the reward compute index to avoid mulitple addition
stakeInfo.rewardComputeIndex = stakeMapIndex;
// Update the User Balance
balances[staker] = balances[staker].add(rewardAmount);
emit AddReward(staker, stakeMapIndex, tokenOperator, totalAmount, rewardAmount, windowTotalStake);
return true;
}
function updateRewards(uint256 stakeMapIndex, address[] calldata staker)
external
onlyOperator
{
for(uint256 indx = 0; indx < staker.length; indx++) {
require(computeAndAddReward(stakeMapIndex, staker[indx]));
}
}
// To claim from the stake window
function claimStake(uint256 stakeMapIndex) public allowClaimStake(stakeMapIndex) {
StakeInfo storage stakeInfo = stakeHolderInfo[msg.sender];
uint256 stakeAmount;
// General claim
if(stakeInfo.claimableAmount[stakeMapIndex] > 0) {
stakeAmount = stakeInfo.claimableAmount[stakeMapIndex];
stakeInfo.claimableAmount[stakeMapIndex] = 0;
} else {
// No more stake windows & beyond grace period
stakeAmount = stakeInfo.approvedAmount;
stakeInfo.approvedAmount = 0;
// Update current stake period total stake
windowTotalStake = windowTotalStake.sub(stakeAmount);
}
// Check for balance in the contract
require(token.balanceOf(address(this)) >= stakeAmount, "Not enough balance in the contract");
// Update the User Balance
balances[msg.sender] = balances[msg.sender].sub(stakeAmount);
// Call the transfer function
require(token.transfer(msg.sender, stakeAmount), "Unable to transfer token back to the account");
emit ClaimStake(stakeMapIndex, msg.sender, stakeAmount);
}
// Migration - Load existing Stake Windows & Stakers
function migrateStakeWindow(uint256 _startPeriod, uint256 _submissionEndPeriod, uint256 _approvalEndPeriod, uint256 _requestWithdrawStartPeriod, uint256 _endPeriod, uint256 _windowRewardAmount, uint256 _minStake, bool _openForExternal) public onlyOperator {
// Add check for Block Number to restrict migration after certain block number
require(block.number < maxMigrationBlocks, "Exceeds migration phase");
// Check Input Parameters for past stake windows
require(now > _startPeriod && _startPeriod < _submissionEndPeriod && _submissionEndPeriod < _approvalEndPeriod && _approvalEndPeriod < _requestWithdrawStartPeriod && _requestWithdrawStartPeriod < _endPeriod, "Invalid stake period");
require(_windowRewardAmount > 0 && _minStake > 0, "Invalid inputs" );
// Move the staking period to next one
currentStakeMapIndex = currentStakeMapIndex + 1;
StakePeriod memory stakePeriod;
// Set Staking attributes
stakePeriod.startPeriod = _startPeriod;
stakePeriod.submissionEndPeriod = _submissionEndPeriod;
stakePeriod.approvalEndPeriod = _approvalEndPeriod;
stakePeriod.requestWithdrawStartPeriod = _requestWithdrawStartPeriod;
stakePeriod.endPeriod = _endPeriod;
stakePeriod.windowRewardAmount = _windowRewardAmount;
stakePeriod.minStake = _minStake;
stakePeriod.openForExternal = _openForExternal;
stakeMap[currentStakeMapIndex] = stakePeriod;
}
// Migration - Load existing stakes along with computed reward
function migrateStakes(uint256 stakeMapIndex, address[] calldata staker, uint256[] calldata stakeAmount) external onlyOperator {
// Add check for Block Number to restrict migration after certain block number
require(block.number < maxMigrationBlocks, "Exceeds migration phase");
// Check Input Parameters
require(staker.length == stakeAmount.length, "Invalid Input Arrays");
// Stakers should be for current window
require(currentStakeMapIndex == stakeMapIndex, "Invalid Stake Window Index");
for(uint256 indx = 0; indx < staker.length; indx++) {
StakeInfo memory req;
// Create a stake request with approvedAmount
req.exist = true;
req.pendingForApprovalAmount = 0;
req.approvedAmount = stakeAmount[indx];
req.rewardComputeIndex = stakeMapIndex;
// Add to the Stake Holders List
stakeHolderInfo[staker[indx]] = req;
// Add to the Stake Holders List
stakeHolders.push(staker[indx]);
// Update the User balance
balances[staker[indx]] = stakeAmount[indx];
// Update current stake period total stake - Along with Reward
windowTotalStake = windowTotalStake.add(stakeAmount[indx]);
}
}
// Getter Functions
function getStakeHolders() public view returns(address[] memory) {
return stakeHolders;
}
function getStakeInfo(uint256 stakeMapIndex, address staker)
public
view
returns (bool found, uint256 approvedAmount, uint256 pendingForApprovalAmount, uint256 rewardComputeIndex, uint256 claimableAmount)
{
StakeInfo storage stakeInfo = stakeHolderInfo[staker];
found = false;
if(stakeInfo.exist) {
found = true;
}
pendingForApprovalAmount = stakeInfo.pendingForApprovalAmount;
approvedAmount = stakeInfo.approvedAmount;
rewardComputeIndex = stakeInfo.rewardComputeIndex;
claimableAmount = stakeInfo.claimableAmount[stakeMapIndex];
}
}
{
"compilationTarget": {
"TokenStake.sol": "TokenStake"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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