Contract Source Code:
File 1 of 1 : Strategy
// SPDX-License-Identifier: MIT
pragma solidity 0.8.12;
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*
* ==== Security Considerations
*
* There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
* expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
* considered as an intention to spend the allowance in any specific way. The second is that because permits have
* built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
* take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
* generally recommended is:
*
* ```solidity
* function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
* try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
* doThing(..., value);
* }
*
* function doThing(..., uint256 value) public {
* token.safeTransferFrom(msg.sender, address(this), value);
* ...
* }
* ```
*
* Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
* `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
* {SafeERC20-safeTransferFrom}).
*
* Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
* contracts should have entry points that don't rely on permit.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*
* CAUTION: See Security Considerations above.
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");
(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 functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)
// 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 generally not needed starting with Solidity 0.8, since 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 subtraction 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;
}
}
}
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.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;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.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;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @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 {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @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 {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_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);
}
}
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)
/**
* @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;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @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() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
}
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
/**
* @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.
*/
abstract 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() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
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());
}
}
interface IStrategy {
// Total want tokens managed by strategy
function wantLockedTotal() external view returns (uint256);
// Sum of all shares of users to wantLockedTotal
function sharesTotal() external view returns (uint256);
function wantAddress() external view returns (address);
function token0Address() external view returns (address);
function token1Address() external view returns (address);
function earnedAddress() external view returns (address);
function getPricePerFullShare() external view returns (uint256);
// Main want token compounding function
function earn() external;
// Transfer want tokens autoFarm -> strategy
function deposit(address _userAddress, uint256 _wantAmt) external returns (uint256);
// Transfer want tokens strategy -> autoFarm
function withdraw(address _userAddress, uint256 _wantAmt) external returns (uint256);
function migrateFrom(address _oldStrategy, uint256 _oldWantLockedTotal, uint256 _oldSharesTotal) external;
function inCaseTokensGetStuck(address _token, uint256 _amount) external;
function inFarmBalance() external view returns (uint256);
function totalBalance() external view returns (uint256);
}
interface IOracle {
function update() external;
function consult(address _token, uint256 _amountIn) external view returns (uint256 amountOut);
function twap(address _token, uint256 _amountIn) external view returns (uint256 _amountOut);
}
interface IFarmChef {
function deposit(uint256 _pid, uint256 _amount) external;
function withdraw(uint256 _pid, uint256 _amount) external;
function pendingShare(uint256 _pid, address _user) external view returns (uint256);
function pendingShareAndPendingRewards(uint256 _pid, address _user) external view returns (uint256);
function userInfo(uint256 _pid, address _user) external view returns (uint256 amount, uint256 rewardDebt);
function harvest(uint256 _pid) external payable;
function gsnakeOracle() external view returns (address);
function pegStabilityModuleFee() external view returns (uint256);
}
interface IRouter {
struct Route {
address from;
address to;
bool stable;
}
function getAmountsOut(uint256 amountIn, Route[] memory routes) external view returns (uint256[] memory amounts);
function addLiquidity(
address tokenA,
address tokenB,
bool stable,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
external
returns (
uint256 amountA,
uint256 amountB,
uint256 liquidity
);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
Route[] calldata routes,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
Route[] calldata routes,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
}
contract Strategy is IStrategy, Ownable, ReentrancyGuard, Pausable {
// Maximises yields in quickswap
using SafeMath for uint256;
using SafeERC20 for IERC20;
address public farmContractAddress; // address of masterchef contract.
uint256 public pid; // pid of pool in farmContractAddress
address public override wantAddress;
address public override token0Address;
address public override token1Address;
address public override earnedAddress;
address public dexRouterAddress; //
bool public stable;
mapping(address => mapping(address => IRouter.Route[])) public tokenRoutes;
address public constant WS = address(0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38);
address public controller;
address public strategist;
address public timelock;
bool public notPublic = false; // allow public to call earn() function
uint256 public lastEarnTime = 0;
uint256 public autoEarnLimit = 10 * 1e18; // 10 S
uint256 public autoEarnDelaySeconds = 6 hours;
uint256 public override wantLockedTotal = 0;
uint256 public override sharesTotal = 0;
uint256 public totalEarned = 0;
uint256 public controllerFee = 50; //5%
uint256 public constant controllerFeeMax = 1000; // 10 = 1%
uint256 public constant controllerFeeUL = 20;
address public treasuryAddress; // to burn
event Deposit(uint256 amount);
event Withdraw(uint256 amount);
event Farm(uint256 amount);
event Compound(address token0Address, uint256 token0Amt, address token1Address, uint256 token1Amt);
event Earned(address earnedAddress, uint256 earnedAmt);
event BuyBack(address earnedAddress, uint earnedAmt, uint256 buyBackAmt, address receiver);
event DistributeFee(address earnedAddress, uint256 fee, address receiver);
event InCaseTokensGetStuck(address tokenAddress, uint256 tokenAmt, address receiver);
event ExecuteTransaction(address indexed target, uint256 value, string signature, bytes data);
event DepositS(address indexed user, uint256 amount);
event WithdrawS(address indexed user, uint256 amount);
constructor(
address _controller,
address _timelock,
address _treasuryAddress,
address _farmContractAddress,
address _dexRouterAddress,
uint256 _pid,
address _wantAddress,
address _earnedAddress,
address _token0,
address _token1,
bool _stable
) {
controller = _controller;
strategist = msg.sender;
timelock = _timelock;
treasuryAddress = _treasuryAddress;
// to call earn if public not allowed
farmContractAddress = _farmContractAddress;
dexRouterAddress = _dexRouterAddress;
wantAddress = _wantAddress;
token0Address = _token0;
token1Address = _token1;
pid = _pid;
earnedAddress = _earnedAddress;
stable = _stable;
}
modifier onlyController() {
require(controller == msg.sender, "caller is not the controller");
_;
}
modifier onlyStrategist() {
require(strategist == msg.sender || owner() == msg.sender, "Strategy: caller is not the strategist");
_;
}
modifier onlyTimelock() {
require(timelock == msg.sender, "Strategy: caller is not timelock");
_;
}
function isAuthorised(address _account) public view returns (bool) {
return (_account == owner()) || (msg.sender == strategist) || (msg.sender == timelock);
}
function _checkAutoEarn() internal {
if (!paused() && !notPublic) {
uint256 _pendingHarvestSValue = pendingHarvestSValue();
if (_pendingHarvestSValue >= autoEarnLimit) {
earn();
}
}
}
function inFarmBalance() public override view returns (uint256) {
(uint256 amount,) = IFarmChef(farmContractAddress).userInfo(pid, address(this));
return amount;
}
function totalBalance() external override view returns (uint256) {
return IERC20(wantAddress).balanceOf(address(this)) + inFarmBalance();
}
function getPricePerFullShare() external override view returns (uint256) {
return (sharesTotal == 0) ? 1e18 : wantLockedTotal.mul(1e18).div(sharesTotal);
}
// Receives new deposits from user
function deposit(address, uint256 _wantAmt) external override onlyController nonReentrant whenNotPaused returns (uint256) {
_checkAutoEarn();
IERC20(wantAddress).safeTransferFrom(address(msg.sender), address(this), _wantAmt);
uint256 sharesAdded = _wantAmt;
if (wantLockedTotal > 0 && sharesTotal > 0) {
sharesAdded = _wantAmt.mul(sharesTotal).div(wantLockedTotal);
}
sharesTotal = sharesTotal.add(sharesAdded);
_farm();
emit Deposit(_wantAmt);
return sharesAdded;
}
function farm() public nonReentrant {
_farm();
}
function _farm() internal {
IERC20 _want = IERC20(wantAddress);
uint256 wantAmt = _want.balanceOf(address(this));
wantLockedTotal = wantLockedTotal.add(wantAmt);
if (wantAmt > 0) {
_want.safeIncreaseAllowance(farmContractAddress, wantAmt);
IFarmChef(farmContractAddress).deposit(pid, wantAmt);
emit Farm(wantAmt);
}
}
function withdraw(address, uint256 _wantAmt) external override onlyController nonReentrant returns (uint256) {
require(_wantAmt > 0, "Strategy: !_wantAmt");
_checkAutoEarn();
IFarmChef(farmContractAddress).withdraw(pid, _wantAmt);
uint256 wantAmt = IERC20(wantAddress).balanceOf(address(this));
if (_wantAmt > wantAmt) {
_wantAmt = wantAmt;
}
if (wantLockedTotal < _wantAmt) {
_wantAmt = wantLockedTotal;
}
uint256 sharesRemoved = _wantAmt.mul(sharesTotal).div(wantLockedTotal);
if (sharesRemoved > sharesTotal) {
sharesRemoved = sharesTotal;
}
sharesTotal = sharesTotal.sub(sharesRemoved);
wantLockedTotal = wantLockedTotal.sub(_wantAmt);
IERC20(wantAddress).safeTransfer(address(msg.sender), _wantAmt);
emit Withdraw(_wantAmt);
return sharesRemoved;
}
function _harvest() public {
// Harvest farm tokens
// Get pending rewards from farm contract
uint256 pendingReward = IFarmChef(farmContractAddress).pendingShareAndPendingRewards(pid, address(this));
uint256 pegStabilityModuleFee = IFarmChef(farmContractAddress).pegStabilityModuleFee();
IOracle oracle = IOracle(IFarmChef(farmContractAddress).gsnakeOracle());
// Calculate the required Sonic (S) amount to cover PSM fee (15% of pending reward value)
uint256 currentGSNAKEPriceInSonic = oracle.twap(earnedAddress, 1e18);
//add 1% to make sure enough Sonic to cover fee
uint256 amountSonicToPay = (currentGSNAKEPriceInSonic.mul(pendingReward).div(1e18)).mul(pegStabilityModuleFee + 10).div(1000);
// Harvest farm rewards before compounding, sending required Sonic (S)
IFarmChef(farmContractAddress).harvest{value: amountSonicToPay}(pid);
}
// 1. Harvest farm tokens
// 2. Converts farm tokens into want tokens
// 3. Deposits want tokens
function earn() public override whenNotPaused nonReentrant {
require(!notPublic || isAuthorised(msg.sender), "Strategy: !authorised");
//1. harvest rewards
_harvest();
//2. Swap token to repay S collateral (add 0,03% to reduce slippage)
uint256 earnedAmount = IERC20(earnedAddress).balanceOf(address(this));
emit Earned(earnedAddress, earnedAmount);
uint256 pegStabilityModuleFee = IFarmChef(farmContractAddress).pegStabilityModuleFee();
_swapTokenToSonic(earnedAddress, earnedAmount.mul(pegStabilityModuleFee + 3).div(1000), address(this));
//3. Swap token to pay Controller Fee
_swapTokenToSonic(earnedAddress, earnedAmount.mul(controllerFee).div(1000), owner());
//4. Converts farm tokens into want tokens
earnedAmount = IERC20(earnedAddress).balanceOf(address(this));
// track totalEarned in S
totalEarned = totalEarned.add(exchangeRate(earnedAddress, WS, earnedAmount));
if (earnedAddress != token0Address) {
_swapTokenToToken(earnedAddress, token0Address, earnedAmount.div(2), address(this));
}
if (earnedAddress != token1Address) {
_swapTokenToToken(earnedAddress, token1Address, earnedAmount.div(2), address(this));
}
// Get want tokens, ie. add liquidity
uint256 token0Amt = IERC20(token0Address).balanceOf(address(this));
uint256 token1Amt = IERC20(token1Address).balanceOf(address(this));
if (token0Amt > 0 && token1Amt > 0) {
_addLiquidity(token0Address, token1Address, stable, token0Amt, token1Amt);
emit Compound(token0Address, token0Amt, token1Address, token1Amt);
}
lastEarnTime = block.timestamp;
_farm();
}
function exchangeRate(address _inputToken, address _outputToken, uint256 _tokenAmount) public view returns (uint256) {
uint256[] memory amounts = IRouter(dexRouterAddress).getAmountsOut(_tokenAmount, tokenRoutes[_inputToken][_outputToken]);
return amounts[amounts.length - 1];
}
function pendingHarvest() public view returns (uint256) {
uint256 _earnedBal = IERC20(earnedAddress).balanceOf(address(this));
return IFarmChef(farmContractAddress).pendingShareAndPendingRewards(pid, address(this)).add(_earnedBal);
}
function pendingHarvestSValue() public view returns (uint256) {
uint256 _pending = pendingHarvest();
return (_pending == 0) ? 0 : exchangeRate(earnedAddress, WS, _pending);
}
function pause() external onlyOwner {
_pause();
}
function unpause() external onlyOwner {
_unpause();
}
function setStrategist(address _strategist) external onlyOwner {
strategist = _strategist;
}
function setControllerFee(uint256 _controllerFee) external onlyOwner {
require(_controllerFee <= controllerFeeUL, "Strategy: too high");
controllerFee = _controllerFee;
}
function setTreasuryAddress(address _treasuryAddress) external onlyOwner {
require(_treasuryAddress != address(0), "zero");
treasuryAddress = _treasuryAddress;
}
function setDexRouterAddress(address _routerAddress) external onlyOwner {
require(_routerAddress != address(0), "zero");
dexRouterAddress = _routerAddress;
}
function setNotPublic(bool _notPublic) external onlyOwner {
notPublic = _notPublic;
}
function setAutoEarnLimit(uint256 _autoEarnLimit) external onlyOwner {
autoEarnLimit = _autoEarnLimit;
}
function setAutoEarnDelaySeconds(uint256 _autoEarnDelaySeconds) external onlyOwner {
autoEarnDelaySeconds = _autoEarnDelaySeconds;
}
function setMainPaths(
IRouter.Route[] memory _earnedToToken0Path,
IRouter.Route[] memory _earnedToToken1Path,
IRouter.Route[] memory _earnedToWSPath,
IRouter.Route[] memory _token0ToEarnedPath,
IRouter.Route[] memory _token1ToEarnedPath
) external onlyOwner {
setTokenRoute(earnedAddress, token0Address, _earnedToToken0Path);
setTokenRoute(earnedAddress, token1Address, _earnedToToken1Path);
setTokenRoute(earnedAddress, WS, _earnedToWSPath);
setTokenRoute(token0Address, earnedAddress, _token0ToEarnedPath);
setTokenRoute(token1Address, earnedAddress, _token1ToEarnedPath);
}
function setTokenRoute(
address from,
address to,
IRouter.Route[] memory routes
) public onlyOwner {
delete tokenRoutes[from][to]; // Xóa dữ liệu cũ trước khi cập nhật
for (uint256 i = 0; i < routes.length; i++) {
tokenRoutes[from][to].push(routes[i]);
}
}
function _swapTokenToSonic(address _inputToken, uint256 _amount, address to) internal {
IERC20(_inputToken).safeIncreaseAllowance(dexRouterAddress, _amount);
if (_inputToken != WS) {
IRouter(dexRouterAddress).swapExactTokensForETHSupportingFeeOnTransferTokens(_amount, 0, tokenRoutes[_inputToken][WS], to, block.timestamp.add(1800));
}
}
function _swapTokenToToken(address _inputToken, address _outputToken, uint256 _amount, address to) internal {
IERC20(_inputToken).safeIncreaseAllowance(dexRouterAddress, _amount);
if (_inputToken != _outputToken) {
IRouter(dexRouterAddress).swapExactTokensForTokensSupportingFeeOnTransferTokens(_amount, 0, tokenRoutes[_inputToken][_outputToken], to, block.timestamp.add(1800));
}
}
function _addLiquidity(address _tokenA, address _tokenB, bool _stable, uint256 _amountADesired, uint256 _amountBDesired) internal {
IERC20(_tokenA).safeIncreaseAllowance(dexRouterAddress, _amountADesired);
IERC20(_tokenB).safeIncreaseAllowance(dexRouterAddress, _amountBDesired);
IRouter(dexRouterAddress).addLiquidity(_tokenA, _tokenB, _stable, _amountADesired, _amountBDesired, 0, 0, address(this), block.timestamp.add(1800));
}
receive() external payable {
_deposit();
}
fallback() external payable {
_deposit();
}
function depositS() external payable {
_deposit();
}
function _deposit() internal {
require(msg.value > 0, "Must send S");
emit DepositS(msg.sender, msg.value);
}
function withdrawS(uint256 amount) external onlyOwner {
require(amount > 0, "Amount must be greater than zero");
require(address(this).balance >= amount, "Insufficient S balance in contract");
(bool success, ) = payable(treasuryAddress).call{value: amount}("");
require(success, "Withdraw failed");
emit WithdrawS(msg.sender, amount);
}
function inCaseTokensGetStuck(address _token, uint256 _amount) external override onlyOwner {
require(_token != earnedAddress, "!safe");
require(_token != wantAddress, "!safe");
address _controller = controller;
IERC20(_token).safeTransfer(_controller, _amount);
emit InCaseTokensGetStuck(_token, _amount, _controller);
}
function togglePause() external onlyOwner {
if (paused()) _unpause();
else _pause();
}
function migrateFrom(address, uint256, uint256) external override onlyController {
}
/* ========== EMERGENCY ========== */
function setController(address _controller) external {
require(_controller != address(0), "invalidAddress");
require(controller == msg.sender || timelock == msg.sender, "caller is not the controller nor timelock");
controller = _controller;
}
function setTimelock(address _timelock) external {
require(timelock == msg.sender || (timelock == address(0) && owner() == msg.sender), "!timelock");
timelock = _timelock;
}
/**
* @dev This is from Timelock contract.
*/
function executeTransaction(address target, uint256 value, string memory signature, bytes memory data) external onlyTimelock returns (bytes memory) {
bytes memory callData;
if (bytes(signature).length == 0) {
callData = data;
} else {
callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
}
// solium-disable-next-line security/no-call-value
(bool success, bytes memory returnData) = target.call{value : value}(callData);
require(success, "Strategy::executeTransaction: Transaction execution reverted.");
emit ExecuteTransaction(target, value, signature, data);
return returnData;
}
}