Description:
Multi-signature wallet contract requiring multiple confirmations for transaction execution.
Blockchain: Ethereum
Source Code: View Code On The Blockchain
Solidity Source Code:
{{
"language": "Solidity",
"sources": {
"@openzeppelin/contracts/interfaces/IERC1363.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)
pragma solidity >=0.6.2;
import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";
/**
* @title IERC1363
* @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
*
* Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
* after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
*/
interface IERC1363 is IERC20, IERC165 {
/*
* Note: the ERC-165 identifier for this interface is 0xb0202a11.
* 0xb0202a11 ===
* bytes4(keccak256('transferAndCall(address,uint256)')) ^
* bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
* bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
* bytes4(keccak256('approveAndCall(address,uint256)')) ^
* bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
*/
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
* and then calls {IERC1363Receiver-onTransferReceived} on `to`.
* @param from The address which you want to send tokens from.
* @param to The address which you want to transfer to.
* @param value The amount of tokens to be transferred.
* @param data Additional data with no specified format, sent in call to `to`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value) external returns (bool);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
* @param data Additional data with no specified format, sent in call to `spender`.
* @return A boolean value indicating whether the operation succeeded unless throwing.
*/
function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
},
"@openzeppelin/contracts/interfaces/IERC165.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)
pragma solidity >=0.4.16;
import {IERC165} from "../utils/introspection/IERC165.sol";
"
},
"@openzeppelin/contracts/interfaces/IERC20.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)
pragma solidity >=0.4.16;
import {IERC20} from "../token/ERC20/IERC20.sol";
"
},
"@openzeppelin/contracts/interfaces/IERC4626.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC4626.sol)
pragma solidity >=0.6.2;
import {IERC20} from "../token/ERC20/IERC20.sol";
import {IERC20Metadata} from "../token/ERC20/extensions/IERC20Metadata.sol";
/**
* @dev Interface of the ERC-4626 "Tokenized Vault Standard", as defined in
* https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
*/
interface IERC4626 is IERC20, IERC20Metadata {
event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);
event Withdraw(
address indexed sender,
address indexed receiver,
address indexed owner,
uint256 assets,
uint256 shares
);
/**
* @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
*
* - MUST be an ERC-20 token contract.
* - MUST NOT revert.
*/
function asset() external view returns (address assetTokenAddress);
/**
* @dev Returns the total amount of the underlying asset that is “managed” by Vault.
*
* - SHOULD include any compounding that occurs from yield.
* - MUST be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT revert.
*/
function totalAssets() external view returns (uint256 totalManagedAssets);
/**
* @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
* scenario where all the conditions are met.
*
* - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT show any variations depending on the caller.
* - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
* - MUST NOT revert.
*
* NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
* “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
* from.
*/
function convertToShares(uint256 assets) external view returns (uint256 shares);
/**
* @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
* scenario where all the conditions are met.
*
* - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT show any variations depending on the caller.
* - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
* - MUST NOT revert.
*
* NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
* “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
* from.
*/
function convertToAssets(uint256 shares) external view returns (uint256 assets);
/**
* @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
* through a deposit call.
*
* - MUST return a limited value if receiver is subject to some deposit limit.
* - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
* - MUST NOT revert.
*/
function maxDeposit(address receiver) external view returns (uint256 maxAssets);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
* current on-chain conditions.
*
* - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
* call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
* in the same transaction.
* - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
* deposit would be accepted, regardless if the user has enough tokens approved, etc.
* - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by depositing.
*/
function previewDeposit(uint256 assets) external view returns (uint256 shares);
/**
* @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
*
* - MUST emit the Deposit event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* deposit execution, and are accounted for during deposit.
* - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
* approving enough underlying tokens to the Vault contract, etc).
*
* NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
*/
function deposit(uint256 assets, address receiver) external returns (uint256 shares);
/**
* @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
* - MUST return a limited value if receiver is subject to some mint limit.
* - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
* - MUST NOT revert.
*/
function maxMint(address receiver) external view returns (uint256 maxShares);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
* current on-chain conditions.
*
* - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
* in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
* same transaction.
* - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
* would be accepted, regardless if the user has enough tokens approved, etc.
* - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by minting.
*/
function previewMint(uint256 shares) external view returns (uint256 assets);
/**
* @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
*
* - MUST emit the Deposit event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
* execution, and are accounted for during mint.
* - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
* approving enough underlying tokens to the Vault contract, etc).
*
* NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
*/
function mint(uint256 shares, address receiver) external returns (uint256 assets);
/**
* @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
* Vault, through a withdraw call.
*
* - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
* - MUST NOT revert.
*/
function maxWithdraw(address owner) external view returns (uint256 maxAssets);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
* given current on-chain conditions.
*
* - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
* call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
* called
* in the same transaction.
* - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
* the withdrawal would be accepted, regardless if the user has enough shares, etc.
* - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by depositing.
*/
function previewWithdraw(uint256 assets) external view returns (uint256 shares);
/**
* @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
*
* - MUST emit the Withdraw event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* withdraw execution, and are accounted for during withdraw.
* - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
* not having enough shares, etc).
*
* Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
* Those methods should be performed separately.
*/
function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);
/**
* @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
* through a redeem call.
*
* - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
* - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
* - MUST NOT revert.
*/
function maxRedeem(address owner) external view returns (uint256 maxShares);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their redemption at the current block,
* given current on-chain conditions.
*
* - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
* in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
* same transaction.
* - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
* redemption would be accepted, regardless if the user has enough shares, etc.
* - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by redeeming.
*/
function previewRedeem(uint256 shares) external view returns (uint256 assets);
/**
* @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
*
* - MUST emit the Withdraw event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* redeem execution, and are accounted for during redeem.
* - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
* not having enough shares, etc).
*
* NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
* Those methods should be performed separately.
*/
function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}
"
},
"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity >=0.6.2;
import {IERC20} from "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC-20 standard.
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
"
},
"@openzeppelin/contracts/token/ERC20/IERC20.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)
pragma solidity >=0.4.16;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
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 value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` 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 value) external returns (bool);
}
"
},
"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC-20 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 {
/**
* @dev An operation with an ERC-20 token failed.
*/
error SafeERC20FailedOperation(address token);
/**
* @dev Indicates a failed `decreaseAllowance` request.
*/
error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
/**
* @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
}
/**
* @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
}
/**
* @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
forceApprove(token, spender, oldAllowance + value);
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
* value, non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
unchecked {
uint256 currentAllowance = token.allowance(address(this), spender);
if (currentAllowance < requestedDecrease) {
revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
}
forceApprove(token, spender, currentAllowance - requestedDecrease);
}
}
/**
* @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.
*
* NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
* only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
* set here.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
safeTransfer(token, to, value);
} else if (!token.transferAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
* has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferFromAndCallRelaxed(
IERC1363 token,
address from,
address to,
uint256 value,
bytes memory data
) internal {
if (to.code.length == 0) {
safeTransferFrom(token, from, to, value);
} else if (!token.transferFromAndCall(from, to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
* Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
* once without retrying, and relies on the returned value to be true.
*
* Reverts if the returned value is other than `true`.
*/
function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
forceApprove(token, to, value);
} else if (!token.approveAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
// bubble errors
if iszero(success) {
let ptr := mload(0x40)
returndatacopy(ptr, 0, returndatasize())
revert(ptr, returndatasize())
}
returnSize := returndatasize()
returnValue := mload(0)
}
if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @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 silently catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
bool success;
uint256 returnSize;
uint256 returnValue;
assembly ("memory-safe") {
success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
returnSize := returndatasize()
returnValue := mload(0)
}
return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
}
}
"
},
"@openzeppelin/contracts/utils/introspection/IERC165.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)
pragma solidity >=0.4.16;
/**
* @dev Interface of the ERC-165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[ERC].
*
* 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[ERC 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);
}
"
},
"@openzeppelin/contracts/utils/ReentrancyGuardTransient.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/ReentrancyGuardTransient.sol)
pragma solidity ^0.8.24;
import {TransientSlot} from "./TransientSlot.sol";
/**
* @dev Variant of {ReentrancyGuard} that uses transient storage.
*
* NOTE: This variant only works on networks where EIP-1153 is available.
*
* _Available since v5.1._
*/
abstract contract ReentrancyGuardTransient {
using TransientSlot for *;
// keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
bytes32 private constant REENTRANCY_GUARD_STORAGE =
0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;
/**
* @dev Unauthorized reentrant call.
*/
error ReentrancyGuardReentrantCall();
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, REENTRANCY_GUARD_STORAGE.asBoolean().tload() will be false
if (_reentrancyGuardEntered()) {
revert ReentrancyGuardReentrantCall();
}
// Any calls to nonReentrant after this point will fail
REENTRANCY_GUARD_STORAGE.asBoolean().tstore(true);
}
function _nonReentrantAfter() private {
REENTRANCY_GUARD_STORAGE.asBoolean().tstore(false);
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return REENTRANCY_GUARD_STORAGE.asBoolean().tload();
}
}
"
},
"@openzeppelin/contracts/utils/TransientSlot.sol": {
"content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/TransientSlot.sol)
// This file was procedurally generated from scripts/generate/templates/TransientSlot.js.
pragma solidity ^0.8.24;
/**
* @dev Library for reading and writing value-types to specific transient storage slots.
*
* Transient slots are often used to store temporary values that are removed after the current transaction.
* This library helps with reading and writing to such slots without the need for inline assembly.
*
* * Example reading and writing values using transient storage:
* ```solidity
* contract Lock {
* using TransientSlot for *;
*
* // Define the slot. Alternatively, use the SlotDerivation library to derive the slot.
* bytes32 internal constant _LOCK_SLOT = 0xf4678858b2b588224636b8522b729e7722d32fc491da849ed75b3fdf3c84f542;
*
* modifier locked() {
* require(!_LOCK_SLOT.asBoolean().tload());
*
* _LOCK_SLOT.asBoolean().tstore(true);
* _;
* _LOCK_SLOT.asBoolean().tstore(false);
* }
* }
* ```
*
* TIP: Consider using this library along with {SlotDerivation}.
*/
library TransientSlot {
/**
* @dev UDVT that represents a slot holding an address.
*/
type AddressSlot is bytes32;
/**
* @dev Cast an arbitrary slot to a AddressSlot.
*/
function asAddress(bytes32 slot) internal pure returns (AddressSlot) {
return AddressSlot.wrap(slot);
}
/**
* @dev UDVT that represents a slot holding a bool.
*/
type BooleanSlot is bytes32;
/**
* @dev Cast an arbitrary slot to a BooleanSlot.
*/
function asBoolean(bytes32 slot) internal pure returns (BooleanSlot) {
return BooleanSlot.wrap(slot);
}
/**
* @dev UDVT that represents a slot holding a bytes32.
*/
type Bytes32Slot is bytes32;
/**
* @dev Cast an arbitrary slot to a Bytes32Slot.
*/
function asBytes32(bytes32 slot) internal pure returns (Bytes32Slot) {
return Bytes32Slot.wrap(slot);
}
/**
* @dev UDVT that represents a slot holding a uint256.
*/
type Uint256Slot is bytes32;
/**
* @dev Cast an arbitrary slot to a Uint256Slot.
*/
function asUint256(bytes32 slot) internal pure returns (Uint256Slot) {
return Uint256Slot.wrap(slot);
}
/**
* @dev UDVT that represents a slot holding a int256.
*/
type Int256Slot is bytes32;
/**
* @dev Cast an arbitrary slot to a Int256Slot.
*/
function asInt256(bytes32 slot) internal pure returns (Int256Slot) {
return Int256Slot.wrap(slot);
}
/**
* @dev Load the value held at location `slot` in transient storage.
*/
function tload(AddressSlot slot) internal view returns (address value) {
assembly ("memory-safe") {
value := tload(slot)
}
}
/**
* @dev Store `value` at location `slot` in transient storage.
*/
function tstore(AddressSlot slot, address value) internal {
assembly ("memory-safe") {
tstore(slot, value)
}
}
/**
* @dev Load the value held at location `slot` in transient storage.
*/
function tload(BooleanSlot slot) internal view returns (bool value) {
assembly ("memory-safe") {
value := tload(slot)
}
}
/**
* @dev Store `value` at location `slot` in transient storage.
*/
function tstore(BooleanSlot slot, bool value) internal {
assembly ("memory-safe") {
tstore(slot, value)
}
}
/**
* @dev Load the value held at location `slot` in transient storage.
*/
function tload(Bytes32Slot slot) internal view returns (bytes32 value) {
assembly ("memory-safe") {
value := tload(slot)
}
}
/**
* @dev Store `value` at location `slot` in transient storage.
*/
function tstore(Bytes32Slot slot, bytes32 value) internal {
assembly ("memory-safe") {
tstore(slot, value)
}
}
/**
* @dev Load the value held at location `slot` in transient storage.
*/
function tload(Uint256Slot slot) internal view returns (uint256 value) {
assembly ("memory-safe") {
value := tload(slot)
}
}
/**
* @dev Store `value` at location `slot` in transient storage.
*/
function tstore(Uint256Slot slot, uint256 value) internal {
assembly ("memory-safe") {
tstore(slot, value)
}
}
/**
* @dev Load the value held at location `slot` in transient storage.
*/
function tload(Int256Slot slot) internal view returns (int256 value) {
assembly ("memory-safe") {
value := tload(slot)
}
}
/**
* @dev Store `value` at location `slot` in transient storage.
*/
function tstore(Int256Slot slot, int256 value) internal {
assembly ("memory-safe") {
tstore(slot, value)
}
}
}
"
},
"contracts/interfaces/IPermit2.sol": {
"content": "// SPDX-License-Identifier: UNLICENSED
// solhint-disable func-name-mixedcase
pragma solidity ^0.8.28;
interface IPermit2 {
function DOMAIN_SEPARATOR() external view returns (bytes32);
/// @notice Thrown when the requested amount for a transfer is larger than the permissioned amount
/// @param maxAmount The maximum amount a spender can request to transfer
error InvalidAmount(uint256 maxAmount);
/// @notice Thrown when the number of tokens permissioned to a spender does not match the number of tokens being transferred
/// @dev If the spender does not need to transfer the number of tokens permitted, the spender can request amount 0 to be transferred
error LengthMismatch();
/// @notice Emits an event when the owner successfully invalidates an unordered nonce.
event UnorderedNonceInvalidation(address indexed owner, uint256 word, uint256 mask);
/// @notice The token and amount details for a transfer signed in the permit transfer signature
struct TokenPermissions {
// ERC20 token address
address token;
// the maximum amount that can be spent
uint256 amount;
}
/// @notice The signed permit message for a single token transfer
struct PermitTransferFrom {
TokenPermissions permitted;
// a unique value for every token owner's signature to prevent signature replays
uint256 nonce;
// deadline on the permit signature
uint256 deadline;
}
/// @notice Specifies the recipient address and amount for batched transfers.
/// @dev Recipients and amounts correspond to the index of the signed token permissions array.
/// @dev Reverts if the requested amount is greater than the permitted signed amount.
struct SignatureTransferDetails {
// recipient address
address to;
// spender requested amount
uint256 requestedAmount;
}
/// @notice Used to reconstruct the signed permit message for multiple token transfers
/// @dev Do not need to pass in spender address as it is required that it is msg.sender
/// @dev Note that a user still signs over a spender address
struct PermitBatchTransferFrom {
// the tokens and corresponding amounts permitted for a transfer
TokenPermissions[] permitted;
// a unique value for every token owner's signature to prevent signature replays
uint256 nonce;
// deadline on the permit signature
uint256 deadline;
}
/// @notice A map from token owner address and a caller specified word index to a bitmap. Used to set bits in the bitmap to prevent against signature replay protection
/// @dev Uses unordered nonces so that permit messages do not need to be spent in a certain order
/// @dev The mapping is indexed first by the token owner, then by an index specified in the nonce
/// @dev It returns a uint256 bitmap
/// @dev The index, or wordPosition is capped at type(uint248).max
function nonceBitmap(address, uint256) external view returns (uint256);
/// @notice Transfers a token using a signed permit message
/// @dev Reverts if the requested amount is greater than the permitted signed amount
/// @param permit The permit data signed over by the owner
/// @param owner The owner of the tokens to transfer
/// @param transferDetails The spender's requested transfer details for the permitted token
/// @param signature The signature to verify
function permitTransferFrom(
PermitTransferFrom memory permit,
SignatureTransferDetails calldata transferDetails,
address owner,
bytes calldata signature
) external;
/// @notice Transfers a token using a signed permit message
/// @notice Includes extra data provided by the caller to verify signature over
/// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
/// @dev Reverts if the requested amount is greater than the permitted signed amount
/// @param permit The permit data signed over by the owner
/// @param owner The owner of the tokens to transfer
/// @param transferDetails The spender's requested transfer details for the permitted token
/// @param witness Extra data to include when checking the user signature
/// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
/// @param signature The signature to verify
function permitWitnessTransferFrom(
PermitTransferFrom memory permit,
SignatureTransferDetails calldata transferDetails,
address owner,
bytes32 witness,
string calldata witnessTypeString,
bytes calldata signature
) external;
/// @notice Transfers multiple tokens using a signed permit message
/// @param permit The permit data signed over by the owner
/// @param owner The owner of the tokens to transfer
/// @param transferDetails Specifies the recipient and requested amount for the token transfer
/// @param signature The signature to verify
function permitTransferFrom(
PermitBatchTransferFrom memory permit,
SignatureTransferDetails[] calldata transferDetails,
address owner,
bytes calldata signature
) external;
/// @notice Transfers multiple tokens using a signed permit message
/// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
/// @notice Includes extra data provided by the caller to verify signature over
/// @param permit The permit data signed over by the owner
/// @param owner The owner of the tokens to transfer
/// @param transferDetails Specifies the recipient and requested amount for the token transfer
/// @param witness Extra data to include when checking the user signature
/// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
/// @param signature The signature to verify
function permitWitnessTransferFrom(
PermitBatchTransferFrom memory permit,
SignatureTransferDetails[] calldata transferDetails,
address owner,
bytes32 witness,
string calldata witnessTypeString,
bytes calldata signature
) external;
/// @notice Invalidates the bits specified in mask for the bitmap at the word position
/// @dev The wordPos is maxed at type(uint248).max
/// @param wordPos A number to index the nonceBitmap at
/// @param mask A bitmap masked against msg.sender's current bitmap at the word position
function invalidateUnorderedNonces(uint256 wordPos, uint256 mask) external;
/// @notice Thrown when an allowance on a token has expired.
/// @param deadline The timestamp at which the allowed amount is no longer valid
error AllowanceExpired(uint256 deadline);
/// @notice Thrown when an allowance on a token has been depleted.
/// @param amount The maximum amount allowed
error InsufficientAllowance(uint256 amount);
/// @notice Thrown when too many nonces are invalidated.
error ExcessiveInvalidation();
/// @notice Emits an event when the owner successfully invalidates an ordered nonce.
event NonceInvalidation(
address indexed owner, address indexed token, address indexed spender, uint48 newNonce, uint48 oldNonce
);
/// @notice Emits an event when the owner successfully sets permissions on a token for the spender.
event Approval(
address indexed owner, address indexed token, address indexed spender, uint160 amount, uint48 expiration
);
/// @notice Emits an event when the owner successfully sets permissions using a permit signature on a token for the spender.
event Permit(
address indexed owner,
address indexed token,
address indexed spender,
uint160 amount,
uint48 expiration,
uint48 nonce
);
/// @notice Emits an event when the owner sets the allowance back to 0 with the lockdown function.
event Lockdown(address indexed owner, address token, address spender);
/// @notice The permit data for a token
struct PermitDetails {
// ERC20 token address
address token;
// the maximum amount allowed to spend
uint160 amount;
// timestamp at which a spender's token allowances become invalid
uint48 expiration;
// an incrementing value indexed per owner,token,and spender for each signature
uint48 nonce;
}
/// @notice The permit message signed for a single token allowance
struct PermitSingle {
// the permit data for a single token alownce
PermitDetails details;
// address permissioned on the allowed tokens
address spender;
// deadline on the permit signature
uint256 sigDeadline;
}
/// @notice The permit message signed for multiple token allowances
struct PermitBatch {
// the permit data for multiple token allowances
PermitDetails[] details;
// address permissioned on the allowed tokens
address spender;
// deadline on the permit signature
uint256 sigDeadline;
}
/// @notice The saved permissions
/// @dev This info is saved per owner, per token, per spender and all signed over in the permit message
/// @dev Setting amount to type(uint160).max sets an unlimited approval
struct PackedAllowance {
// amount allowed
uint160 amount;
// permission expiry
uint48 expiration;
// an incrementing value indexed per owner,token,and spender for each signature
uint48 nonce;
}
/// @notice A token spender pair.
struct TokenSpenderPair {
// the token the spender is approved
address token;
// the spender address
address spender;
}
/// @notice Details for a token transfer.
struct AllowanceTransferDetails {
// the owner of the token
address from;
// the recipient of the token
address to;
// the amount of the token
uint160 amount;
// the token to be transferred
address token;
}
/// @notice A mapping from owner address to token address to spender address to PackedAllowance struct, which contains details and conditions of the approval.
/// @notice The mapping is indexed in the above order see: allowance[ownerAddress][tokenAddress][spenderAddress]
/// @dev The packed slot holds the allowed amount, expiration at which the allowed amount is no longer valid, and current nonce thats updated on any signature based approvals.
function allowance(address user, address token, address spender)
external
view
returns (uint160 amount, uint48 expiration, uint48 nonce);
/// @notice Approves the spender to use up to amount of the specified token up until the expiration
/// @param token The token to approve
/// @param spender The spender address to approve
/// @param amount The approved amount of the token
/// @param expiration The timestamp at which the approval is no longer valid
/// @dev The packed allowance also holds a nonce, which will stay unchanged in approve
/// @dev Setting amount to type(uint160).max sets an unlimited approval
function approve(address token, address spender, uint160 amount, uint48 expiration) external;
/// @notice Permit a spender to a given amount of the owners token via the owner's EIP-712 signature
/// @dev May fail if the owner's nonce was invalidated in-flight by invalidateNonce
/// @param owner The owner of the tokens being approved
/// @param permitSingle Data signed over by the owner specifying the terms of approval
/// @param signature The owner's signature over the permit data
function permit(address owner, PermitSingle memory permitSingle, bytes calldata signature) external;
/// @notice Permit a spender to the signed amounts of the owners tokens via the owner's EIP-712 signature
/// @dev May fail if the owner's nonce was invalidated in-flight by invalidateNonce
/// @param owner The owner of the tokens being approved
/// @param permitBatch Data signed over by the owner specifying the terms of approval
/// @param signature The owner's signature over the permit data
function permit(address owner, PermitBatch memory permitBatch, bytes calldata signature) external;
/// @notice Transfer approved tokens from one address to another
/// @param from The address to transfer from
/// @param to The address of the recipient
/// @param amount The amount of the token to transfer
/// @param token The token address to transfer
/// @dev Requires the from address to have approved at least the desired amount
/// of tokens to msg.sender.
function transferFrom(address from, address to, uint160 amount, address token) external;
/// @notice Transfer approved tokens in a batch
/// @param transferDetails Array of owners, recipients, amounts, and tokens for the transfers
/// @dev Requires the from addresses to have approved at least the desired amount
/// of tokens to msg.sender.
function transferFrom(AllowanceTransferDetails[] calldata transferDetails) external;
/// @notice Enables performing a "lockdown" of the sender's Permit2 identity
/// by batch revoking approvals
/// @param approvals Array of approvals to revoke.
function lockdown(TokenSpenderPair[] calldata approvals) external;
/// @notice Invalidate nonces for a given (token, spender) pair
/// @param token The token to invalidate nonces for
/// @param spender The spender to invalidate nonces for
/// @param newNonce The new nonce to set. Invalidates all nonces less than it.
/// @dev Can't invalidate more than 2**16 nonces per transaction.
function invalidateNonces(address token, address spender, uint48 newNonce) external;
}
"
},
"contracts/types/BuyStaker.types.sol": {
"content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;
error WrongToken(address given, address expected);
error FailedCall();
"
},
"contracts/utils/BuyStaker.sol": {
"content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;
import {IERC4626} from "@openzeppelin/contracts/interfaces/IERC4626.sol";
import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {ReentrancyGuardTransient} from "@openzeppelin/contracts/utils/ReentrancyGuardTransient.sol";
import {WrongToken, FailedCall} from "../types/BuyStaker.types.sol";
import {IPermit2} from "../interfaces/IPermit2.sol";
contract BuyStaker is ReentrancyGuardTransient {
using SafeERC20 for IERC20;
address public immutable TOKEN;
address public immutable ROUTER;
address public immutable STAKING;
IPermit2 public constant PERMIT2 = IPermit2(0x000000000022D473030F116dDEE9F6B43aC78BA3);
constructor(address _token, address _router, address _staking) {
TOKEN = _token;
ROUTER = _router;
STAKING = _staking;
address asset = IERC4626(_staking).asset();
require(_token == asset, WrongToken(_token, asset));
}
function buyAndStakeUsingUniversalRouter(
IPermit2.PermitSingle calldata permitSingle,
bytes calldata permitSignature,
bytes calldata routerPayload
) external nonReentrant {
if (permitSignature.length > 0) {
// solhint-disable-next-line no-empty-blocks
try PERMIT2.permit(msg.sender, permitSingle, permitSignature) {} catch {}
}
PERMIT2.transferFrom(msg.sender, address(this), permitSingle.details.amount, permitSingle.details.token);
IERC20(permitSingle.details.token).safeIncreaseAllowance(address(PERMIT2), permitSingle.details.amount);
PERMIT2.approve(permitSingle.details.token, ROUTER, permitSingle.details.amount, type(uint48).max);
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returnData) = ROUTER.call(routerPayload);
if (!success) {
_revert(returnData);
}
uint256 balance = IERC20(TOKEN).balanceOf(address(this));
IERC20(TOKEN).approve(STAKING, balance);
IERC4626(STAKING).deposit(balance, msg.sender);
}
/**
* @notice author of this code is openzeppelin
* @dev Reverts with returndata if present. Otherwise reverts with {Errors.FailedCall}.
*/
function _revert(bytes memory returndata) 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
// solhint-disable-next-line no-inline-assembly
assembly ("memory-safe") {
revert(add(returndata, 0x20), mload(returndata))
}
} else {
revert FailedCall();
}
}
}
"
}
},
"settings": {
"optimizer": {
"enabled": true,
"runs": 1000
},
"evmVersion": "cancun",
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"metadata": {
"useLiteralContent": true
}
}
}}Submitted on: 2025-10-15 11:53:06
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