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Latest 25 from a total of 17,761 transactions
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| Swap And Deposit | 9329097 | 22 mins ago | IN | 0.002 ETH | 0.00003625 | ||||
| Swap And Deposit | 9328849 | 35 mins ago | IN | 0.002 ETH | 0.00003709 | ||||
| Swap And Deposit | 9328467 | 53 mins ago | IN | 0.002 ETH | 0.00002615 | ||||
| Swap And Deposit | 9327829 | 1 hr ago | IN | 0.002 ETH | 0.00005149 | ||||
| Swap And Deposit | 9327387 | 1 hr ago | IN | 0 ETH | 0.00004677 | ||||
| Swap And Deposit | 9327239 | 1 hr ago | IN | 0.002 ETH | 0.0000699 | ||||
| Swap And Deposit | 9324645 | 4 hrs ago | IN | 0 ETH | 0.00003846 | ||||
| Swap And Deposit | 9323119 | 5 hrs ago | IN | 0 ETH | 0.00002511 | ||||
| Swap In Same Cha... | 9322033 | 6 hrs ago | IN | 0 ETH | 0.00004574 | ||||
| Swap In Same Cha... | 9322012 | 6 hrs ago | IN | 0.21 ETH | 0.00002274 | ||||
| Swap And Deposit | 9317515 | 9 hrs ago | IN | 0.0002 ETH | 0.0000181 | ||||
| Swap And Deposit | 9317451 | 9 hrs ago | IN | 0.0002 ETH | 0.00001895 | ||||
| Swap And Deposit | 9317350 | 10 hrs ago | IN | 0.022 ETH | 0.00003484 | ||||
| Swap And Deposit | 9317294 | 10 hrs ago | IN | 0.022 ETH | 0.0000348 | ||||
| Swap And Deposit | 9315696 | 11 hrs ago | IN | 0.044 ETH | 0.00002153 | ||||
| Swap And Deposit | 9315215 | 11 hrs ago | IN | 0.0022 ETH | 0.00001696 | ||||
| Swap And Deposit | 9315167 | 11 hrs ago | IN | 0.0022 ETH | 0.00001693 | ||||
| Swap And Deposit | 9315154 | 11 hrs ago | IN | 0.0022 ETH | 0.00001696 | ||||
| Swap And Deposit | 9315136 | 11 hrs ago | IN | 0.0022 ETH | 0.00001716 | ||||
| Swap And Deposit | 9315129 | 11 hrs ago | IN | 0.0022 ETH | 0.00001713 | ||||
| Swap And Deposit | 9315123 | 11 hrs ago | IN | 0.0022 ETH | 0.00001719 | ||||
| Swap In Same Cha... | 9315068 | 11 hrs ago | IN | 0.001 ETH | 0.0000344 | ||||
| Swap In Same Cha... | 9313821 | 12 hrs ago | IN | 0 ETH | 0.0000441 | ||||
| Swap And Deposit | 9313737 | 13 hrs ago | IN | 0 ETH | 0.00003533 | ||||
| Swap And Deposit | 9313633 | 13 hrs ago | IN | 0 ETH | 0.00003061 |
Latest 25 internal transactions (View All)
| Parent Transaction Hash | Block | From | To | |||
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| 9329464 | 4 mins ago | 0.0149925 ETH | ||||
| 9329464 | 4 mins ago | 0.0149925 ETH | ||||
| 9329408 | 7 mins ago | 0.0149925 ETH | ||||
| 9329408 | 7 mins ago | 0.0149925 ETH | ||||
| 9329377 | 8 mins ago | 0.015992 ETH | ||||
| 9329377 | 8 mins ago | 0.015992 ETH | ||||
| 9329249 | 15 mins ago | 0.0049975 ETH | ||||
| 9329249 | 15 mins ago | 0.0049975 ETH | ||||
| 9329097 | 22 mins ago | 0.002 ETH | ||||
| 9328964 | 29 mins ago | 0.015992 ETH | ||||
| 9328964 | 29 mins ago | 0.015992 ETH | ||||
| 9328889 | 33 mins ago | 0.015992 ETH | ||||
| 9328889 | 33 mins ago | 0.015992 ETH | ||||
| 9328857 | 34 mins ago | 0.0149925 ETH | ||||
| 9328857 | 34 mins ago | 0.0149925 ETH | ||||
| 9328849 | 35 mins ago | 0.002 ETH | ||||
| 9328742 | 40 mins ago | 0.01649175 ETH | ||||
| 9328742 | 40 mins ago | 0.01649175 ETH | ||||
| 9328597 | 47 mins ago | 0.0149925 ETH | ||||
| 9328597 | 47 mins ago | 0.0149925 ETH | ||||
| 9328467 | 53 mins ago | 0.002 ETH | ||||
| 9328462 | 54 mins ago | 0.00076828 ETH | ||||
| 9328462 | 54 mins ago | 0.00076828 ETH | ||||
| 9328451 | 54 mins ago | 0.0032625 ETH | ||||
| 9328451 | 54 mins ago | 0.0032625 ETH |
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Contract Name:
DexSpan
Compiler Version
v0.8.20+commit.a1b79de6
Contract Source Code (Solidity)
/**
*Submitted for verification at scrollscan.com on 2024-03-18
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
// 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 v4.9.3) (token/ERC20/utils/SafeERC20.sol)
// 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);
}
}
}
/**
* @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) (token/ERC20/IERC20.sol)
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20Upgradeable {
/**
* @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 v4.9.0) (access/Ownable.sol)
// 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;
}
}
/**
* @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) (access/AccessControl.sol)
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
/**
* @dev External interface of AccessControl declared to support ERC165 detection.
*/
interface IAccessControl {
/**
* @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
*
* `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
* {RoleAdminChanged} not being emitted signaling this.
*
* _Available since v3.1._
*/
event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
/**
* @dev Emitted when `account` is granted `role`.
*
* `sender` is the account that originated the contract call, an admin role
* bearer except when using {AccessControl-_setupRole}.
*/
event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Emitted when `account` is revoked `role`.
*
* `sender` is the account that originated the contract call:
* - if using `revokeRole`, it is the admin role bearer
* - if using `renounceRole`, it is the role bearer (i.e. `account`)
*/
event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) external view returns (bool);
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {AccessControl-_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) external view returns (bytes32);
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function grantRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function revokeRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been granted `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*/
function renounceRole(bytes32 role, address account) external;
}
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toString(int256 value) internal pure returns (string memory) {
return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, Math.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return keccak256(bytes(a)) == keccak256(bytes(b));
}
}
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
/**
* @dev Contract module that allows children to implement role-based access
* control mechanisms. This is a lightweight version that doesn't allow enumerating role
* members except through off-chain means by accessing the contract event logs. Some
* applications may benefit from on-chain enumerability, for those cases see
* {AccessControlEnumerable}.
*
* Roles are referred to by their `bytes32` identifier. These should be exposed
* in the external API and be unique. The best way to achieve this is by
* using `public constant` hash digests:
*
* ```solidity
* bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
* ```
*
* Roles can be used to represent a set of permissions. To restrict access to a
* function call, use {hasRole}:
*
* ```solidity
* function foo() public {
* require(hasRole(MY_ROLE, msg.sender));
* ...
* }
* ```
*
* Roles can be granted and revoked dynamically via the {grantRole} and
* {revokeRole} functions. Each role has an associated admin role, and only
* accounts that have a role's admin role can call {grantRole} and {revokeRole}.
*
* By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
* that only accounts with this role will be able to grant or revoke other
* roles. More complex role relationships can be created by using
* {_setRoleAdmin}.
*
* WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
* grant and revoke this role. Extra precautions should be taken to secure
* accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
* to enforce additional security measures for this role.
*/
abstract contract AccessControl is Context, IAccessControl, ERC165 {
struct RoleData {
mapping(address => bool) members;
bytes32 adminRole;
}
mapping(bytes32 => RoleData) private _roles;
bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
/**
* @dev Modifier that checks that an account has a specific role. Reverts
* with a standardized message including the required role.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*
* _Available since v4.1._
*/
modifier onlyRole(bytes32 role) {
_checkRole(role);
_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
return _roles[role].members[account];
}
/**
* @dev Revert with a standard message if `_msgSender()` is missing `role`.
* Overriding this function changes the behavior of the {onlyRole} modifier.
*
* Format of the revert message is described in {_checkRole}.
*
* _Available since v4.6._
*/
function _checkRole(bytes32 role) internal view virtual {
_checkRole(role, _msgSender());
}
/**
* @dev Revert with a standard message if `account` is missing `role`.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*/
function _checkRole(bytes32 role, address account) internal view virtual {
if (!hasRole(role, account)) {
revert(
string(
abi.encodePacked(
"AccessControl: account ",
Strings.toHexString(account),
" is missing role ",
Strings.toHexString(uint256(role), 32)
)
)
);
}
}
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
return _roles[role].adminRole;
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleGranted} event.
*/
function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_grantRole(role, account);
}
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleRevoked} event.
*/
function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_revokeRole(role, account);
}
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been revoked `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*
* May emit a {RoleRevoked} event.
*/
function renounceRole(bytes32 role, address account) public virtual override {
require(account == _msgSender(), "AccessControl: can only renounce roles for self");
_revokeRole(role, account);
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event. Note that unlike {grantRole}, this function doesn't perform any
* checks on the calling account.
*
* May emit a {RoleGranted} event.
*
* [WARNING]
* ====
* This function should only be called from the constructor when setting
* up the initial roles for the system.
*
* Using this function in any other way is effectively circumventing the admin
* system imposed by {AccessControl}.
* ====
*
* NOTE: This function is deprecated in favor of {_grantRole}.
*/
function _setupRole(bytes32 role, address account) internal virtual {
_grantRole(role, account);
}
/**
* @dev Sets `adminRole` as ``role``'s admin role.
*
* Emits a {RoleAdminChanged} event.
*/
function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
bytes32 previousAdminRole = getRoleAdmin(role);
_roles[role].adminRole = adminRole;
emit RoleAdminChanged(role, previousAdminRole, adminRole);
}
/**
* @dev Grants `role` to `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleGranted} event.
*/
function _grantRole(bytes32 role, address account) internal virtual {
if (!hasRole(role, account)) {
_roles[role].members[account] = true;
emit RoleGranted(role, account, _msgSender());
}
}
/**
* @dev Revokes `role` from `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleRevoked} event.
*/
function _revokeRole(bytes32 role, address account) internal virtual {
if (hasRole(role, account)) {
_roles[role].members[account] = false;
emit RoleRevoked(role, account, _msgSender());
}
}
}
// OpenZeppelin Contracts (last updated v4.9.5) (utils/Multicall.sol)
/**
* @dev Provides a function to batch together multiple calls in a single external call.
*
* Consider any assumption about calldata validation performed by the sender may be violated if it's not especially
* careful about sending transactions invoking {multicall}. For example, a relay address that filters function
* selectors won't filter calls nested within a {multicall} operation.
*
* NOTE: Since 5.0.1 and 4.9.4, this contract identifies non-canonical contexts (i.e. `msg.sender` is not {_msgSender}).
* If a non-canonical context is identified, the following self `delegatecall` appends the last bytes of `msg.data`
* to the subcall. This makes it safe to use with {ERC2771Context}. Contexts that don't affect the resolution of
* {_msgSender} are not propagated to subcalls.
*
* _Available since v4.1._
*/
abstract contract Multicall is Context {
/**
* @dev Receives and executes a batch of function calls on this contract.
* @custom:oz-upgrades-unsafe-allow-reachable delegatecall
*/
function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
bytes memory context = msg.sender == _msgSender()
? new bytes(0)
: msg.data[msg.data.length - _contextSuffixLength():];
results = new bytes[](data.length);
for (uint256 i = 0; i < data.length; i++) {
results[i] = Address.functionDelegateCall(address(this), bytes.concat(data[i], context));
}
return results;
}
}
interface IUniswapExchange {
function getEthToTokenInputPrice(
uint256 ethSold
) external view returns (uint256 tokensBought);
function getTokenToEthInputPrice(
uint256 tokensSold
) external view returns (uint256 ethBought);
function ethToTokenSwapInput(
uint256 minTokens,
uint256 deadline
) external payable returns (uint256 tokensBought);
function tokenToEthSwapInput(
uint256 tokensSold,
uint256 minEth,
uint256 deadline
) external returns (uint256 ethBought);
function tokenToTokenSwapInput(
uint256 tokensSold,
uint256 minTokensBought,
uint256 minEthBought,
uint256 deadline,
address tokenAddr
) external returns (uint256 tokensBought);
}
interface IUniswapFactory {
function getExchange(
IERC20Upgradeable token
) external view returns (IUniswapExchange exchange);
}
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library MathUpgradeable {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}
// 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 SafeMathUpgradeable {
/**
* @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 v4.9.3) (token/ERC20/utils/SafeERC20.sol)
// 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 IERC20PermitUpgradeable {
/**
* @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 AddressUpgradeable {
/**
* @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);
}
}
}
/**
* @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 SafeERC20Upgradeable {
using AddressUpgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(
IERC20PermitUpgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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))) && AddressUpgradeable.isContract(address(token));
}
}
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
function safeApprove(address token, address to, uint256 value) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0x095ea7b3, to, value)
);
require(
success && (data.length == 0 || abi.decode(data, (bool))),
"TransferHelper::safeApprove: approve failed"
);
}
function safeTransfer(address token, address to, uint256 value) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0xa9059cbb, to, value)
);
require(
success && (data.length == 0 || abi.decode(data, (bool))),
"TransferHelper::safeTransfer: transfer failed"
);
}
function safeTransferFrom(
address token,
address from,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0x23b872dd, from, to, value)
);
require(
success && (data.length == 0 || abi.decode(data, (bool))),
"TransferHelper::transferFrom: transferFrom failed"
);
}
}
library UniversalERC20 {
using SafeMathUpgradeable for uint256;
using SafeERC20Upgradeable for IERC20Upgradeable;
IERC20Upgradeable private constant ZERO_ADDRESS =
IERC20Upgradeable(0x0000000000000000000000000000000000000000);
IERC20Upgradeable private constant ETH_ADDRESS =
IERC20Upgradeable(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
function universalTransfer(
IERC20Upgradeable token,
address to,
uint256 amount
) internal returns (bool) {
if (amount == 0) {
return true;
}
if (isETH(token)) {
(bool success, ) = payable(address(uint160(to))).call{
value: amount
}("");
assert(success == true);
} else {
TransferHelper.safeTransfer(address(token), to, amount);
return true;
}
}
function universalTransferFrom(
IERC20Upgradeable token,
address from,
address to,
uint256 amount
) internal {
if (amount == 0) {
return;
}
if (isETH(token)) {
require(
from == msg.sender && msg.value >= amount,
"Wrong usage of ETH.universalTransferFrom()"
);
if (to != address(this)) {
(bool success, ) = payable(address(uint160(to))).call{
value: amount
}("");
assert(success == true);
}
if (msg.value > amount) {
(bool success, ) = payable(msg.sender).call{
value: msg.value.sub(amount)
}("");
assert(success == true);
}
} else {
TransferHelper.safeTransferFrom(address(token), from, to, amount);
}
}
function universalTransferFromSenderToThis(
IERC20Upgradeable token,
uint256 amount
) internal {
if (amount == 0) {
return;
}
if (isETH(token)) {
if (msg.value > amount) {
// Return remainder if exist
(bool success, ) = payable(msg.sender).call{
value: msg.value.sub(amount)
}("");
assert(success == true);
}
} else {
TransferHelper.safeTransferFrom(
address(token),
msg.sender,
address(this),
amount
);
}
}
function universalApprove(
IERC20Upgradeable token,
address to,
uint256 amount
) internal {
if (!isETH(token)) {
// if (amount == 0) {
// TransferHelper.safeApprove(address(token), to, 0);
// return;
// }
// uint256 allowance = token.allowance(address(this), to);
// if (allowance < amount) {
// if (allowance > 0) {
// TransferHelper.safeApprove(address(token), to, 0);
// }
// TransferHelper.safeApprove(address(token), to, amount);
// }
TransferHelper.safeApprove(address(token), to, 0);
TransferHelper.safeApprove(address(token), to, amount);
}
}
function universalBalanceOf(
IERC20Upgradeable token,
address who
) internal view returns (uint256) {
if (isETH(token)) {
return who.balance;
} else {
return token.balanceOf(who);
}
}
function isETH(IERC20Upgradeable token) internal pure returns (bool) {
return (address(token) == address(ZERO_ADDRESS) ||
address(token) == address(ETH_ADDRESS));
}
function eq(
IERC20Upgradeable a,
IERC20Upgradeable b
) internal pure returns (bool) {
return a == b || (isETH(a) && isETH(b));
}
}
interface IUniswapV2Exchange {
function getReserves()
external
view
returns (
uint112 _reserve0,
uint112 _reserve1,
uint32 _blockTimestampLast
);
function swap(
uint256 amount0Out,
uint256 amount1Out,
address to,
bytes calldata data
) external;
function skim(address to) external;
function sync() external;
}
library UniswapV2ExchangeLib {
using MathUpgradeable for uint256;
using SafeMathUpgradeable for uint256;
using UniversalERC20 for IERC20Upgradeable;
function getReturn(
IUniswapV2Exchange exchange,
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amountIn
) internal view returns (uint256 result, bool needSync, bool needSkim) {
uint256 reserveIn = fromToken.universalBalanceOf(address(exchange));
uint256 reserveOut = destToken.universalBalanceOf(address(exchange));
(uint112 reserve0, uint112 reserve1, ) = exchange.getReserves();
if (fromToken > destToken) {
(reserve0, reserve1) = (reserve1, reserve0);
}
needSync = (reserveIn < reserve0 || reserveOut < reserve1);
needSkim = !needSync && (reserveIn > reserve0 || reserveOut > reserve1);
uint256 amountInWithFee = amountIn.mul(997);
uint256 numerator = amountInWithFee.mul(
MathUpgradeable.min(reserveOut, reserve1)
);
uint256 denominator = MathUpgradeable
.min(reserveIn, reserve0)
.mul(1000)
.add(amountInWithFee);
result = (denominator == 0) ? 0 : numerator.div(denominator);
}
}
interface IUniswapV2Factory {
function getPair(
IERC20Upgradeable tokenA,
IERC20Upgradeable tokenB
) external view returns (IUniswapV2Exchange pair);
}
interface IHandlerReserve {
function _lpToContract(address token) external returns (address);
function _contractToLP(address token) external returns (address);
}
interface IEthHandler {
function withdraw(address WETH, uint256) external;
}
contract DexSpanFlags {
// flags = FLAG_DISABLE_UNISWAP + FLAG_DISABLE_BANCOR + ...
uint256 internal constant FLAG_DISABLE_UNISWAP = 0x400;
uint256 internal constant FLAG_DISABLE_SPLIT_RECALCULATION = 0x800000000000;
uint256 internal constant FLAG_DISABLE_ALL_SPLIT_SOURCES = 0x20000000;
uint256 internal constant FLAG_DISABLE_UNISWAP_V2_ALL = 0x400;
uint256 internal constant FLAG_DISABLE_EMPTY = 0x100000000000;
uint256 internal constant FLAG_DISABLE_DFYN = 0x800;
uint256 internal constant FLAG_DISABLE_PANCAKESWAP = 0x80;
uint256 internal constant FLAG_DISABLE_QUICKSWAP = 0x40000000000;
uint256 internal constant FLAG_DISABLE_SUSHISWAP = 0x1000000;
uint256 internal constant FLAG_DISABLE_ONEINCH = 0x100000;
}
abstract contract IDexSpan is DexSpanFlags {
function getExpectedReturn(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 parts,
uint256 flags // See constants in IOneSplit.sol
)
public
view
virtual
returns (uint256 returnAmount, uint256[] memory distribution);
function getExpectedReturnWithGasMulti(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256[] memory parts,
uint256[] memory flags,
uint256[] memory destTokenEthPriceTimesGasPrices
)
public
view
virtual
returns (
uint256[] memory returnAmounts,
uint256 estimateGasAmount,
uint256[] memory distribution
);
function getExpectedReturnWithGas(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 parts,
uint256 flags, // See constants in IOneSplit.sol
uint256 destTokenEthPriceTimesGasPrice
)
public
view
virtual
returns (
uint256 returnAmount,
uint256 estimateGasAmount,
uint256[] memory distribution
);
function setHandlerAddress(
address _handlerAddress
) external virtual returns (bool);
function setReserveAddress(
address _reserveAddress
) external virtual returns (bool);
function setBridgeAddress(
address _bridgeAddress
) external virtual returns (bool);
function withdraw(
address tokenAddress,
address recipient,
uint256 amount
) public payable virtual returns (bool);
function swap(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 minReturn,
uint256 flags,
bytes memory dataTx,
bool isWrapper
) public payable virtual returns (uint256 returnAmount);
function swapWithRecipient(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 minReturn,
uint256 flags,
bytes memory dataTx,
bool isWrapper,
address recipient
) public payable virtual returns (uint256 returnAmount);
function swapMulti(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256 minReturn,
uint256[] memory flags,
bytes[] memory dataTx,
bool isWrapper
) public payable virtual returns (uint256 returnAmount);
function swapMultiWithRecipient(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256 minReturn,
uint256[] memory flags,
bytes[] memory dataTx,
bool isWrapper,
address recipient
) public payable virtual returns (uint256 returnAmount);
function getExpectedReturnETH(
IERC20Upgradeable srcStablefromtoken,
uint256 srcStableFromTokenAmount,
uint256 parts,
uint256 flags
) public view virtual returns (uint256 returnAmount);
}
abstract contract IWETH is IERC20Upgradeable {
function deposit() external payable virtual;
function withdraw(uint256 amount) external virtual;
}
// import "./libraries/Multicall.sol";
interface IAugustusSwapper {
function getTokenTransferProxy() external view returns (address);
}
/// @title Interface for handler contracts that support deposits and deposit executions.
/// @author Router Protocol.
interface IAssetForwarder {
event FundsDeposited(
uint256 partnerId,
uint256 amount,
bytes32 destChainIdBytes,
uint256 destAmount,
uint256 depositId,
address srcToken,
address depositor,
bytes recipient,
bytes destToken
);
event iUSDCDeposited(
uint256 partnerId,
uint256 amount,
bytes32 destChainIdBytes,
uint256 usdcNonce,
address srcToken,
bytes32 recipient,
address depositor
);
event FundsDepositedWithMessage(
uint256 partnerId,
uint256 amount,
bytes32 destChainIdBytes,
uint256 destAmount,
uint256 depositId,
address srcToken,
bytes recipient,
address depositor,
bytes destToken,
bytes message
);
event FundsPaid(bytes32 messageHash, address forwarder, uint256 nonce);
event DepositInfoUpdate(
address srcToken,
uint256 feeAmount,
uint256 depositId,
uint256 eventNonce,
bool initiatewithdrawal,
address depositor
);
event FundsPaidWithMessage(
bytes32 messageHash,
address forwarder,
uint256 nonce,
bool execFlag,
bytes execData
);
struct DestDetails {
uint32 domainId;
uint256 fee;
bool isSet;
}
struct RelayData {
uint256 amount;
bytes32 srcChainId;
uint256 depositId;
address destToken;
address recipient;
}
struct RelayDataMessage {
uint256 amount;
bytes32 srcChainId;
uint256 depositId;
address destToken;
address recipient;
bytes message;
}
struct DepositData {
uint256 partnerId;
uint256 amount;
uint256 destAmount;
address srcToken;
address refundRecipient;
bytes32 destChainIdBytes;
}
function iDepositUSDC(
uint256 partnerId,
bytes32 destChainIdBytes,
bytes32 recipient,
uint256 amount
) external payable;
function iDeposit(
DepositData memory depositData,
bytes memory destToken,
bytes memory recipient
) external payable;
function iDepositInfoUpdate(
address srcToken,
uint256 feeAmount,
uint256 depositId,
bool initiatewithdrawal
) external payable;
function iDepositMessage(
DepositData memory depositData,
bytes memory destToken,
bytes memory recipient,
bytes memory message
) external payable;
function iRelay(RelayData memory relayData) external payable;
function iRelayMessage(RelayDataMessage memory relayData) external payable;
}
/// @title Handles ERC20 deposits and deposit executions.
/// @author Router Protocol.
/// @notice This contract is intended to be used with the Bridge contract.
interface IMessageHandler {
function handleMessage(
address tokenSent,
uint256 amount,
bytes memory message
) external;
}
abstract contract IDexSpanView is DexSpanFlags {
function getExpectedReturn(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 parts,
uint256 flags
)
public
view
virtual
returns (uint256 returnAmount, uint256[] memory distribution);
function getExpectedReturnWithGas(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 parts,
uint256 flags,
uint256 destTokenEthPriceTimesGasPrice
)
public
view
virtual
returns (
uint256 returnAmount,
uint256 estimateGasAmount,
uint256[] memory distribution
);
}
library DisableFlags {
function check(uint256 flags, uint256 flag) internal pure returns (bool) {
return (flags & flag) != 0;
}
}
contract DexSpanRoot {
using SafeMath for uint256;
using DisableFlags for uint256;
using UniversalERC20 for IERC20Upgradeable;
using UniversalERC20 for IWETH;
using UniswapV2ExchangeLib for IUniswapV2Exchange;
uint256 internal constant DEXES_COUNT = 4;
uint256 internal constant DEXES_COUNT_UPDATED = 1;
IERC20Upgradeable internal ZERO_ADDRESS;
int256 internal constant VERY_NEGATIVE_VALUE = -1e72;
IWETH public wnativeAddress;
IERC20Upgradeable public nativeAddress;
function _findBestDistribution(
uint256 s, // parts
int256[][] memory amounts // exchangesReturns
)
internal
pure
returns (int256 returnAmount, uint256[] memory distribution)
{
uint256 n = amounts.length;
int256[][] memory answer = new int256[][](n); // int[n][s+1]
uint256[][] memory parent = new uint256[][](n); // int[n][s+1]
for (uint256 i; i < n; i++) {
answer[i] = new int256[](s + 1);
parent[i] = new uint256[](s + 1);
}
for (uint256 j; j <= s; j++) {
answer[0][j] = amounts[0][j];
for (uint256 i = 1; i < n; i++) {
answer[i][j] = -1e72;
}
parent[0][j] = 0;
}
for (uint256 i = 1; i < n; i++) {
for (uint256 j; j <= s; j++) {
answer[i][j] = answer[i - 1][j];
parent[i][j] = j;
for (uint256 k = 1; k <= j; k++) {
if (answer[i - 1][j - k] + amounts[i][k] > answer[i][j]) {
answer[i][j] = answer[i - 1][j - k] + amounts[i][k];
parent[i][j] = j - k;
}
}
}
}
distribution = new uint256[](DEXES_COUNT_UPDATED);
uint256 partsLeft = s;
for (uint256 curExchange = n - 1; partsLeft > 0; curExchange--) {
distribution[curExchange] =
partsLeft -
parent[curExchange][partsLeft];
partsLeft = parent[curExchange][partsLeft];
}
returnAmount = (answer[n - 1][s] == VERY_NEGATIVE_VALUE)
? int256(0)
: answer[n - 1][s];
}
}
contract DexSpan is DexSpanFlags, DexSpanRoot, AccessControl, Multicall {
using UniversalERC20 for IERC20Upgradeable;
using SafeMath for uint256;
using DisableFlags for uint256;
using UniswapV2ExchangeLib for IUniswapV2Exchange;
IAssetForwarder public assetForwarder;
address public assetBridge;
address public univ2SkimAddress;
address public newOwner;
// IWETH public wnativeAddress;
mapping(uint256 => address) public flagToAddress;
event Swap(
string indexed funcName,
IERC20Upgradeable[] tokenPath,
uint256 amount,
address indexed sender,
address indexed receiver,
uint256 finalAmt,
uint256[] flags,
uint256 widgetID
);
event SwapWithRecipient(
string indexed funcName,
IERC20Upgradeable[] tokenPath,
uint256 amount,
address indexed sender,
address indexed receiver,
uint256 finalAmt,
uint256[] flags,
uint256 widgetID
);
event SwapOnSameChain(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint amount,
bytes _data,
uint256 flags
);
event SetAssetForwarder(address assetForwarder, address admin);
event SetAssetBridge(address assetBridge, address admin);
event SetFlagToFactory(uint flag, address factoryAddress);
event SetFactorySetter(address factorySetter);
event SetWNativeAddresses(address wrappedNative);
event TransferOwnership(address newOwner);
event ClaimOwnership(address newOwner);
error InavlidPool();
error InavlidCaller();
error ZeroAddress();
error ZeroFlag();
error InvalidCaller();
error RestrictNativeToken();
error WrongTokenSent();
error WrongDataLength();
error AmountTooLow();
error ExcecutionFailed();
error AlreadyFactorySetter();
struct DexesArgs {
IERC20Upgradeable factoryAddress;
uint256 _exchangeCode;
}
struct SwapParams {
IERC20Upgradeable[] tokens;
uint256 amount;
uint256 minReturn;
uint256[] flags;
bytes[] dataTx;
bool isWrapper;
address recipient;
bytes destToken;
}
bytes32 public constant FACTORY_SETTER_ROLE =
keccak256("FACTORY_SETTER_ROLE");
bytes4 internal constant SWAP_MULTI_WITH_RECEPIENT_SELECTOR = 0xe738aa8d;
receive() external payable {}
constructor(
address _assetForwarderAddress,
address _native,
address _wrappedNative,
address _univ2SkimAddress
) {
if (_assetForwarderAddress == address(0)) revert ZeroAddress();
if (_native == address(0)) revert ZeroAddress();
if (_wrappedNative == address(0)) revert ZeroAddress();
if (_univ2SkimAddress == address(0)) revert ZeroAddress();
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
assetForwarder = IAssetForwarder(_assetForwarderAddress);
nativeAddress = IERC20Upgradeable(_native);
wnativeAddress = IWETH(_wrappedNative);
univ2SkimAddress = _univ2SkimAddress;
}
function transferOwnership(
address _newOwner
) external onlyRole(DEFAULT_ADMIN_ROLE) {
if (_newOwner == address(0)) revert ZeroAddress();
newOwner = _newOwner;
emit TransferOwnership(_newOwner);
}
function claimOwnership() external {
if (newOwner != msg.sender) {
revert InavlidCaller();
}
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
emit ClaimOwnership(msg.sender);
}
function setAssetForwarder(
address _forwarder
) external onlyRole(DEFAULT_ADMIN_ROLE) {
if (_forwarder == address(0)) revert ZeroAddress();
assetForwarder = IAssetForwarder(_forwarder);
emit SetAssetForwarder(_forwarder, msg.sender);
}
function setAssetBridge(
address _assetBridge
) external onlyRole(DEFAULT_ADMIN_ROLE) {
if (_assetBridge == address(0)) revert ZeroAddress();
assetBridge = _assetBridge;
emit SetAssetBridge(_assetBridge, msg.sender);
}
function setFlagToFactoryAddress(
uint256 _flagCode,
address _factoryAddress
) external onlyRole(FACTORY_SETTER_ROLE) {
if (_flagCode == 0) revert ZeroFlag();
if (_factoryAddress == address(0)) revert ZeroAddress();
flagToAddress[_flagCode] = address(_factoryAddress);
emit SetFlagToFactory(_flagCode, _factoryAddress);
}
function setFactorySetter(
address _factorySetter
) external onlyRole(DEFAULT_ADMIN_ROLE) {
if (_factorySetter == address(0)) revert ZeroAddress();
if (hasRole(FACTORY_SETTER_ROLE, _factorySetter))
revert AlreadyFactorySetter();
_setupRole(FACTORY_SETTER_ROLE, _factorySetter);
emit SetFactorySetter(_factorySetter);
}
function setWNativeAddresses(
address _native,
address _wrappedNative
) external onlyRole(DEFAULT_ADMIN_ROLE) {
if (_native == address(0)) revert ZeroAddress();
if (_wrappedNative == address(0)) revert ZeroAddress();
nativeAddress = IERC20Upgradeable(_native);
wnativeAddress = IWETH(_wrappedNative);
emit SetWNativeAddresses(_wrappedNative);
}
function handleMessage(
address _tokenSent,
uint256 _amount,
bytes memory message
) external {
if (
msg.sender != address(assetForwarder) &&
msg.sender != address(assetBridge)
) revert InvalidCaller();
messageHandler(_tokenSent, _amount, message);
}
function swapInSameChain(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256 minReturn,
uint256[] memory flags,
bytes[] memory dataTx,
bool isWrapper,
address recipient,
uint256 widgetID
) public payable returns (uint256 returnAmount) {
returnAmount = swapMultiWithRecipient(
tokens,
amount,
minReturn,
flags,
dataTx,
isWrapper,
recipient
);
emit Swap(
"swapInSameChain",
tokens,
amount,
msg.sender,
recipient,
returnAmount,
flags,
widgetID
);
}
function swapMultiWithRecipient(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256 minReturn,
uint256[] memory flags,
bytes[] memory dataTx,
bool isWrapper,
address recipient
) public payable returns (uint256 returnAmount) {
returnAmount = _swapMultiInternal(
tokens,
amount,
minReturn,
flags,
dataTx,
isWrapper,
recipient
);
emit SwapWithRecipient(
"swapMultiWithRecipient",
tokens,
amount,
msg.sender,
recipient,
returnAmount,
flags,
0
);
}
function swapAndDeposit(
uint256 partnerId,
bytes32 destChainIdBytes,
bytes calldata recipient,
uint8 depositType,
uint256 feeAmount,
bytes memory message,
SwapParams memory swapData,
address refundRecipient
) public payable {
_swapMultiInternal(
swapData.tokens,
swapData.amount,
swapData.minReturn,
swapData.flags,
swapData.dataTx,
swapData.isWrapper,
address(this)
);
IERC20Upgradeable reserveToken = swapData.tokens[
swapData.tokens.length - 1
];
// swapAndDeposit
if (depositType == 0) {
uint256 amount = reserveToken.universalBalanceOf(address(this));
reserveToken.universalApprove(address(assetForwarder), amount);
assetForwarder.iDeposit{value: reserveToken.isETH() ? amount : 0}(
IAssetForwarder.DepositData(
partnerId,
amount,
amount - feeAmount,
address(reserveToken),
refundRecipient,
destChainIdBytes
),
swapData.destToken,
recipient
);
return;
}
// swapAndDepositWithMessage
if (depositType == 1) {
uint256 amount = reserveToken.universalBalanceOf(address(this));
reserveToken.universalApprove(
address(assetForwarder),
swapData.minReturn
);
assetForwarder.iDepositMessage{
value: reserveToken.isETH() ? amount : 0
}(
IAssetForwarder.DepositData(
partnerId,
swapData.minReturn,
swapData.minReturn - feeAmount,
address(reserveToken),
refundRecipient,
destChainIdBytes
),
swapData.destToken,
recipient,
message
);
if (amount > swapData.minReturn) {
reserveToken.universalTransfer(
refundRecipient,
amount - swapData.minReturn
);
}
return;
}
// swapAndDepositUSDC : Circle Flow
if (depositType == 2) {
//NOTE: here reserveToken should be usdc
uint256 amount = reserveToken.universalBalanceOf(address(this));
reserveToken.universalApprove(address(assetForwarder), amount);
// any extra fee will be left over here
assetForwarder.iDepositUSDC{value: msg.value}(
partnerId,
destChainIdBytes,
bytes32(recipient),
amount
);
return;
}
}
function messageHandler(
address _tokenSent,
uint256 _amount,
bytes memory message
) internal {
(
IERC20Upgradeable[] memory tokens,
uint256 minReturn,
bytes[] memory dataTx,
uint256[] memory flags,
address recipient,
bool isInstruction,
bytes memory instruction
) = abi.decode(
message,
(
IERC20Upgradeable[],
uint256,
bytes[],
uint256[],
address,
bool,
bytes
)
);
if (_tokenSent != address(tokens[0])) revert WrongTokenSent();
bytes memory execData;
bool execFlag;
(execFlag, execData) = address(this).call(
abi.encodeWithSelector(
SWAP_MULTI_WITH_RECEPIENT_SELECTOR,
tokens,
_amount,
minReturn,
flags,
dataTx,
true,
recipient
)
);
if (!execFlag) {
tokens[0].universalTransfer(recipient, _amount);
}
if (isInstruction) {
uint256 finalAmount = execFlag
? uint256(bytes32(execData))
: _amount;
address finalToken = execFlag
? address(tokens[tokens.length - 1])
: _tokenSent;
(execFlag, execData) = recipient.call(
abi.encodeWithSelector(
IMessageHandler.handleMessage.selector,
finalToken,
finalAmount,
instruction
)
);
}
}
function _swapMultiInternal(
IERC20Upgradeable[] memory tokens,
uint256 amount,
uint256 minReturn,
uint256[] memory flags,
bytes[] memory dataTx,
bool isWrapper,
address recipient
) internal returns (uint256 returnAmount) {
if (recipient == address(0)) revert ZeroAddress();
if (tokens.length - 1 != flags.length) {
revert WrongDataLength();
}
if (!isWrapper) {
if (!tokens[0].isETH() && msg.value != 0) {
revert RestrictNativeToken();
}
tokens[0].universalTransferFrom(msg.sender, address(this), amount);
}
returnAmount = tokens[0].universalBalanceOf(address(this));
IERC20Upgradeable destinationToken = tokens[tokens.length - 1];
for (uint256 i = 1; i < tokens.length; i++) {
if (tokens[i - 1] == tokens[i]) {
continue;
}
returnAmount = _swapFloor(
tokens[i - 1],
tokens[i],
returnAmount,
0,
flags[i - 1],
dataTx[i - 1]
);
}
if (destinationToken.isETH()) {
returnAmount = wnativeAddress.balanceOf(address(this));
wnativeAddress.withdraw(returnAmount);
}
if (recipient != address(this)) {
uint256 userBalanceOld = destinationToken.universalBalanceOf(
recipient
);
destinationToken.universalTransfer(recipient, returnAmount);
uint256 userBalanceNew = destinationToken.universalBalanceOf(
recipient
);
uint receivedTokens = userBalanceNew - userBalanceOld;
if (receivedTokens <= minReturn) {
revert AmountTooLow();
}
returnAmount = receivedTokens;
}
}
function _swapFloor(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 minReturn,
uint256 flags,
bytes memory _data
) internal returns (uint returnAmount) {
returnAmount = _swap(
fromToken,
destToken,
amount,
minReturn,
flags,
_data
);
}
function _swap(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 minReturn,
uint256 flags,
bytes memory _data
) internal returns (uint256 returnAmount) {
if (fromToken == destToken) {
return amount;
}
function(
IERC20Upgradeable,
IERC20Upgradeable,
uint256,
bytes memory,
uint256
) reserve = _getReserveExchange(flags);
uint256 remainingAmount = fromToken.universalBalanceOf(address(this));
reserve(fromToken, destToken, remainingAmount, _data, flags);
returnAmount = destToken.universalBalanceOf(address(this));
}
function _getReserveExchange(
uint256 flag
)
internal
pure
returns (
function(
IERC20Upgradeable,
IERC20Upgradeable,
uint256,
bytes memory,
uint256
)
)
{
if (flag < 0x03E9 && flag >= 0x0001) {
// 1 - 1000
return _swapOnUniswapV2;
} else if (flag == 0x07D2) {
return _swapOnParaswap; // 2002
} else if (flag == 0x03EA) {
return _swapOnOneInch; // 1002
} else if (flag == 0x0FA2) {
return _swapOnOpenocean; // 4002
} else if (flag == 0x0BBA) {
return _swapOnUniswapV3; // 3002
}
revert("RA: Exchange not found");
}
function _swapOnUniswapV2(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
bytes memory _data,
uint256 flags
) internal {
_swapOnExchangeInternal(fromToken, destToken, amount, flags);
}
function _swapOnUniswapV3(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
bytes memory _data,
uint256 flagCode
) internal {
if (_data.length < 0) {
revert WrongDataLength();
}
address uniswapv3router = flagToAddress[flagCode];
if (uniswapv3router == address(0)) {
revert ZeroAddress();
}
if (fromToken.isETH()) {
wnativeAddress.deposit{value: amount}();
}
IERC20Upgradeable fromTokenReal = fromToken.isETH()
? wnativeAddress
: fromToken;
fromTokenReal.universalApprove(address(uniswapv3router), amount);
// solhint-disable-next-line avoid-low-level-calls
(bool success, ) = address(uniswapv3router).call(_data);
if (!success) revert ExcecutionFailed();
}
function _swapOnOpenocean(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
bytes memory _data,
uint256 flagCode
) internal {
if (_data.length < 0) {
revert WrongDataLength();
}
address openoceanSwap = flagToAddress[flagCode];
if (openoceanSwap == address(0)) {
revert ZeroAddress();
}
if (fromToken.isETH()) {
wnativeAddress.deposit{value: amount}();
}
IERC20Upgradeable fromTokenReal = fromToken.isETH()
? wnativeAddress
: fromToken;
fromTokenReal.universalApprove(address(openoceanSwap), amount);
// solhint-disable-next-line avoid-low-level-calls
(bool success, ) = address(openoceanSwap).call(_data);
if (!success) {
revert ExcecutionFailed();
}
}
function _swapOnOneInch(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
bytes memory _data,
uint256 flagCode
) internal {
if (_data.length < 0) {
revert WrongDataLength();
}
address oneInchSwap = flagToAddress[flagCode];
if (oneInchSwap == address(0)) {
revert ZeroAddress();
}
if (fromToken.isETH()) {
wnativeAddress.deposit{value: amount}();
}
IERC20Upgradeable fromTokenReal = fromToken.isETH()
? wnativeAddress
: fromToken;
fromTokenReal.universalApprove(address(oneInchSwap), amount);
// solhint-disable-next-line avoid-low-level-calls
(bool success, ) = address(oneInchSwap).call(_data);
if (!success) {
revert ExcecutionFailed();
}
}
function _swapOnParaswap(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
bytes memory _data,
uint256 flagCode
) internal {
if (_data.length < 0) {
revert WrongDataLength();
}
address paraswap = flagToAddress[flagCode];
if (paraswap == address(0)) {
revert ZeroAddress();
}
if (fromToken.isETH()) {
wnativeAddress.deposit{value: amount}();
}
IERC20Upgradeable fromTokenReal = fromToken.isETH()
? wnativeAddress
: fromToken;
fromTokenReal.universalApprove(
IAugustusSwapper(paraswap).getTokenTransferProxy(),
amount
);
// solhint-disable-next-line avoid-low-level-calls
(bool success, ) = address(paraswap).call(_data);
if (!success) {
revert ExcecutionFailed();
}
}
function _swapOnExchangeInternal(
IERC20Upgradeable fromToken,
IERC20Upgradeable destToken,
uint256 amount,
uint256 flagCode
) internal returns (uint256 returnAmount) {
if (fromToken.isETH()) {
wnativeAddress.deposit{value: amount}();
}
address dexAddress = flagToAddress[flagCode];
require(dexAddress != address(0), "RA: Exchange not found");
IUniswapV2Factory factory = IUniswapV2Factory(address(dexAddress));
IERC20Upgradeable fromTokenReal = fromToken.isETH()
? wnativeAddress
: fromToken;
IERC20Upgradeable toTokenReal = destToken.isETH()
? wnativeAddress
: destToken;
if (fromTokenReal == toTokenReal) {
return amount;
}
IUniswapV2Exchange pool = factory.getPair(fromTokenReal, toTokenReal);
if (address(pool) == address(0)) revert InavlidPool();
bool needSync;
bool needSkim;
(returnAmount, needSync, needSkim) = pool.getReturn(
fromTokenReal,
toTokenReal,
amount
);
if (needSync) {
pool.sync();
} else if (needSkim) {
pool.skim(univ2SkimAddress);
}
fromTokenReal.universalTransfer(address(pool), amount);
if (
uint256(uint160(address(fromTokenReal))) <
uint256(uint160(address(toTokenReal)))
) {
pool.swap(0, returnAmount, address(this), "");
} else {
pool.swap(returnAmount, 0, address(this), "");
}
}
}Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"_assetForwarderAddress","type":"address"},{"internalType":"address","name":"_native","type":"address"},{"internalType":"address","name":"_wrappedNative","type":"address"},{"internalType":"address","name":"_univ2SkimAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AlreadyFactorySetter","type":"error"},{"inputs":[],"name":"AmountTooLow","type":"error"},{"inputs":[],"name":"ExcecutionFailed","type":"error"},{"inputs":[],"name":"InavlidCaller","type":"error"},{"inputs":[],"name":"InavlidPool","type":"error"},{"inputs":[],"name":"InvalidCaller","type":"error"},{"inputs":[],"name":"RestrictNativeToken","type":"error"},{"inputs":[],"name":"WrongDataLength","type":"error"},{"inputs":[],"name":"WrongTokenSent","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"inputs":[],"name":"ZeroFlag","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"ClaimOwnership","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"assetBridge","type":"address"},{"indexed":false,"internalType":"address","name":"admin","type":"address"}],"name":"SetAssetBridge","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"assetForwarder","type":"address"},{"indexed":false,"internalType":"address","name":"admin","type":"address"}],"name":"SetAssetForwarder","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"factorySetter","type":"address"}],"name":"SetFactorySetter","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"flag","type":"uint256"},{"indexed":false,"internalType":"address","name":"factoryAddress","type":"address"}],"name":"SetFlagToFactory","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"wrappedNative","type":"address"}],"name":"SetWNativeAddresses","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"string","name":"funcName","type":"string"},{"indexed":false,"internalType":"contract IERC20Upgradeable[]","name":"tokenPath","type":"address[]"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"finalAmt","type":"uint256"},{"indexed":false,"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"widgetID","type":"uint256"}],"name":"Swap","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract IERC20Upgradeable","name":"fromToken","type":"address"},{"indexed":false,"internalType":"contract IERC20Upgradeable","name":"destToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"_data","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"flags","type":"uint256"}],"name":"SwapOnSameChain","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"string","name":"funcName","type":"string"},{"indexed":false,"internalType":"contract IERC20Upgradeable[]","name":"tokenPath","type":"address[]"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"finalAmt","type":"uint256"},{"indexed":false,"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"widgetID","type":"uint256"}],"name":"SwapWithRecipient","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"TransferOwnership","type":"event"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FACTORY_SETTER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"assetBridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"assetForwarder","outputs":[{"internalType":"contract IAssetForwarder","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"flagToAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenSent","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes","name":"message","type":"bytes"}],"name":"handleMessage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nativeAddress","outputs":[{"internalType":"contract IERC20Upgradeable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"newOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_assetBridge","type":"address"}],"name":"setAssetBridge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_forwarder","type":"address"}],"name":"setAssetForwarder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_factorySetter","type":"address"}],"name":"setFactorySetter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_flagCode","type":"uint256"},{"internalType":"address","name":"_factoryAddress","type":"address"}],"name":"setFlagToFactoryAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_native","type":"address"},{"internalType":"address","name":"_wrappedNative","type":"address"}],"name":"setWNativeAddresses","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"partnerId","type":"uint256"},{"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"internalType":"bytes","name":"recipient","type":"bytes"},{"internalType":"uint8","name":"depositType","type":"uint8"},{"internalType":"uint256","name":"feeAmount","type":"uint256"},{"internalType":"bytes","name":"message","type":"bytes"},{"components":[{"internalType":"contract IERC20Upgradeable[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"bytes[]","name":"dataTx","type":"bytes[]"},{"internalType":"bool","name":"isWrapper","type":"bool"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bytes","name":"destToken","type":"bytes"}],"internalType":"struct DexSpan.SwapParams","name":"swapData","type":"tuple"},{"internalType":"address","name":"refundRecipient","type":"address"}],"name":"swapAndDeposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"bytes[]","name":"dataTx","type":"bytes[]"},{"internalType":"bool","name":"isWrapper","type":"bool"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"widgetID","type":"uint256"}],"name":"swapInSameChain","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable[]","name":"tokens","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"bytes[]","name":"dataTx","type":"bytes[]"},{"internalType":"bool","name":"isWrapper","type":"bool"},{"internalType":"address","name":"recipient","type":"address"}],"name":"swapMultiWithRecipient","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"univ2SkimAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wnativeAddress","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000001b4ce0d48ce91eb6bcaf5db33870c65d641b894000000000000000000000000eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee0000000000000000000000005300000000000000000000000000000000000004000000000000000000000000b1b64005b11350a94c4d069eff4215592d98f2e2
-----Decoded View---------------
Arg [0] : _assetForwarderAddress (address): 0x01B4CE0d48Ce91eB6bcaf5dB33870C65d641b894
Arg [1] : _native (address): 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
Arg [2] : _wrappedNative (address): 0x5300000000000000000000000000000000000004
Arg [3] : _univ2SkimAddress (address): 0xB1b64005B11350a94c4D069eff4215592d98F2E2
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 00000000000000000000000001b4ce0d48ce91eb6bcaf5db33870c65d641b894
Arg [1] : 000000000000000000000000eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Arg [2] : 0000000000000000000000005300000000000000000000000000000000000004
Arg [3] : 000000000000000000000000b1b64005b11350a94c4d069eff4215592d98f2e2
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://f233254f60810fffa4df2aa6c8f504943466fc2c52e7fbcec0dda0e42998d420
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.