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Minimal Proxy Contract for 0x12e3250114a4a8439f8fedccd0cfcc41a4e7b572
Contract Name:
Auction
Compiler Version
v0.8.18+commit.87f61d96
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2024-03-21 */ // SPDX-License-Identifier: AGPL-3.0 pragma solidity 0.8.18; // Math library from https://github.com/ajna-finance/ajna-core/blob/master/src/libraries/internal/Maths.sol /** @title Maths library @notice Internal library containing common maths. */ library Maths { uint256 internal constant WAD = 1e18; uint256 internal constant RAY = 1e27; function wmul(uint256 x, uint256 y) internal pure returns (uint256) { return (x * y + WAD / 2) / WAD; } function floorWmul(uint256 x, uint256 y) internal pure returns (uint256) { return (x * y) / WAD; } function ceilWmul(uint256 x, uint256 y) internal pure returns (uint256) { return (x * y + WAD - 1) / WAD; } function wdiv(uint256 x, uint256 y) internal pure returns (uint256) { return (x * WAD + y / 2) / y; } function floorWdiv(uint256 x, uint256 y) internal pure returns (uint256) { return (x * WAD) / y; } function ceilWdiv(uint256 x, uint256 y) internal pure returns (uint256) { return (x * WAD + y - 1) / y; } function ceilDiv(uint256 x, uint256 y) internal pure returns (uint256) { return (x + y - 1) / y; } function max(uint256 x, uint256 y) internal pure returns (uint256) { return x >= y ? x : y; } function min(uint256 x, uint256 y) internal pure returns (uint256) { return x <= y ? x : y; } function wad(uint256 x) internal pure returns (uint256) { return x * WAD; } function rmul(uint256 x, uint256 y) internal pure returns (uint256) { return (x * y + RAY / 2) / RAY; } function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) { z = n % 2 != 0 ? x : RAY; for (n /= 2; n != 0; n /= 2) { x = rmul(x, x); if (n % 2 != 0) { z = rmul(z, x); } } } /*************************/ /*** Integer Functions ***/ /*************************/ function maxInt(int256 x, int256 y) internal pure returns (int256) { return x >= y ? x : y; } function minInt(int256 x, int256 y) internal pure returns (int256) { return x <= y ? x : y; } } contract Governance { /// @notice Emitted when the governance address is updated. event GovernanceTransferred( address indexed previousGovernance, address indexed newGovernance ); modifier onlyGovernance() { _checkGovernance(); _; } /// @notice Checks if the msg sender is the governance. function _checkGovernance() internal view virtual { require(governance == msg.sender, "!governance"); } /// @notice Address that can set the default base fee and provider address public governance; constructor(address _governance) { governance = _governance; emit GovernanceTransferred(address(0), _governance); } /** * @notice Sets a new address as the governance of the contract. * @dev Throws if the caller is not current governance. * @param _newGovernance The new governance address. */ function transferGovernance( address _newGovernance ) external virtual onlyGovernance { require(_newGovernance != address(0), "ZERO ADDRESS"); address oldGovernance = governance; governance = _newGovernance; emit GovernanceTransferred(oldGovernance, _newGovernance); } } // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ 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 (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 Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * The default value of {decimals} is 18. To change this, you should override * this function so it returns a different value. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the default value returned by this function, unless * it's overridden. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer(address from, address to, uint256 amount) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} } // 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 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) (security/ReentrancyGuard.sol) /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { _nonReentrantBefore(); _; _nonReentrantAfter(); } function _nonReentrantBefore() private { // On the first call to nonReentrant, _status will be _NOT_ENTERED require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; } function _nonReentrantAfter() private { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } /** * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a * `nonReentrant` function in the call stack. */ function _reentrancyGuardEntered() internal view returns (bool) { return _status == _ENTERED; } } interface ITaker { function auctionTakeCallback( bytes32 _auctionId, address _sender, uint256 _amountTaken, uint256 _amountNeeded, bytes calldata _data ) external; } /// @notice Interface that the optional `hook` contract should implement if the non-standard logic is desired. interface IHook { function kickable(address _fromToken) external view returns (uint256); function auctionKicked(address _fromToken) external returns (uint256); function preTake( address _fromToken, uint256 _amountToTake, uint256 _amountToPay ) external; function postTake( address _toToken, uint256 _amountTaken, uint256 _amountPayed ) external; } /** * @title Auction * @author yearn.fi * @notice General use dutch auction contract for token sales. */ contract Auction is Governance, ReentrancyGuard { using SafeERC20 for ERC20; /// @notice Emitted when a new auction is enabled event AuctionEnabled( bytes32 auctionId, address indexed from, address indexed to, address indexed auctionAddress ); /// @notice Emitted when an auction is disabled. event AuctionDisabled( bytes32 auctionId, address indexed from, address indexed to, address indexed auctionAddress ); /// @notice Emitted when auction has been kicked. event AuctionKicked(bytes32 auctionId, uint256 available); /// @notice Emitted when any amount of an active auction was taken. event AuctionTaken( bytes32 auctionId, uint256 amountTaken, uint256 amountLeft ); /// @dev Store address and scaler in one slot. struct TokenInfo { address tokenAddress; uint96 scaler; } /// @notice Store all the auction specific information. struct AuctionInfo { TokenInfo fromInfo; uint96 kicked; address receiver; uint128 initialAvailable; uint128 currentAvailable; } /// @notice Store the hook address and each flag in one slot. struct Hook { address hook; bool kickable; bool kick; bool preTake; bool postTake; } uint256 internal constant WAD = 1e18; /// @notice Used for the price decay. uint256 internal constant MINUTE_HALF_LIFE = 0.988514020352896135_356867505 * 1e27; // 0.5^(1/60) /// @notice Struct to hold the info for `want`. TokenInfo internal wantInfo; /// @notice Contract to call during write functions. Hook internal hook_; /// @notice The amount to start the auction at. uint256 public startingPrice; /// @notice The time that each auction lasts. uint256 public auctionLength; /// @notice The minimum time to wait between auction 'kicks'. uint256 public auctionCooldown; /// @notice Mapping from an auction ID to its struct. mapping(bytes32 => AuctionInfo) public auctions; /// @notice Array of all the enabled auction for this contract. bytes32[] public enabledAuctions; constructor() Governance(msg.sender) {} /** * @notice Initializes the Auction contract with initial parameters. * @param _want Address this auction is selling to. * @param _hook Address of the hook contract (optional). * @param _governance Address of the contract governance. * @param _auctionLength Duration of each auction in seconds. * @param _auctionCooldown Cooldown period between auctions in seconds. * @param _startingPrice Starting price for each auction. */ function initialize( address _want, address _hook, address _governance, uint256 _auctionLength, uint256 _auctionCooldown, uint256 _startingPrice ) external virtual { require(auctionLength == 0, "initialized"); require(_want != address(0), "ZERO ADDRESS"); require(_auctionLength != 0, "length"); require(_auctionLength < _auctionCooldown, "cooldown"); require(_startingPrice != 0, "starting price"); // Cannot have more than 18 decimals. uint256 decimals = ERC20(_want).decimals(); require(decimals <= 18, "unsupported decimals"); // Set variables wantInfo = TokenInfo({ tokenAddress: _want, scaler: uint96(WAD / 10 ** decimals) }); // If we are using a hook. if (_hook != address(0)) { // All flags default to true. hook_ = Hook({ hook: _hook, kickable: true, kick: true, preTake: true, postTake: true }); } governance = _governance; auctionLength = _auctionLength; auctionCooldown = _auctionCooldown; startingPrice = _startingPrice; } /*////////////////////////////////////////////////////////////// VIEW METHODS //////////////////////////////////////////////////////////////*/ /** * @notice Get the address of this auctions want token. * @return . The want token. */ function want() public view virtual returns (address) { return wantInfo.tokenAddress; } /** * @notice Get the address of the hook if any. * @return . The hook. */ function hook() external view virtual returns (address) { return hook_.hook; } /** * @notice Get the current status of which hooks are being used. * @return . If the kickable hook is used. * @return . If the kick hook is used. * @return . If the preTake hook is used. * @return . If the postTake hook is used. */ function getHookFlags() external view virtual returns (bool, bool, bool, bool) { Hook memory _hook = hook_; return (_hook.kickable, _hook.kick, _hook.preTake, _hook.postTake); } /** * @notice Get the length of the enabled auctions array. */ function numberOfEnabledAuctions() external view virtual returns (uint256) { return enabledAuctions.length; } /** * @notice Get the unique auction identifier. * @param _from The address of the token to sell. * @return bytes32 A unique auction identifier. */ function getAuctionId(address _from) public view virtual returns (bytes32) { return keccak256(abi.encodePacked(_from, want(), address(this))); } /** * @notice Retrieves information about a specific auction. * @param _auctionId The unique identifier of the auction. * @return _from The address of the token to sell. * @return _to The address of the token to buy. * @return _kicked The timestamp of the last kick. * @return _available The current available amount for the auction. */ function auctionInfo( bytes32 _auctionId ) public view virtual returns ( address _from, address _to, uint256 _kicked, uint256 _available ) { AuctionInfo memory auction = auctions[_auctionId]; return ( auction.fromInfo.tokenAddress, want(), auction.kicked, auction.kicked + auctionLength > block.timestamp ? auction.currentAvailable : 0 ); } /** * @notice Get the pending amount available for the next auction. * @dev Defaults to the auctions balance of the from token if no hook. * @param _auctionId The unique identifier of the auction. * @return uint256 The amount that can be kicked into the auction. */ function kickable( bytes32 _auctionId ) external view virtual returns (uint256) { // If not enough time has passed then `kickable` is 0. if (auctions[_auctionId].kicked + auctionCooldown > block.timestamp) { return 0; } // Check if we have a hook to call. Hook memory _hook = hook_; if (_hook.kickable) { // If so default to the hooks logic. return IHook(_hook.hook).kickable( auctions[_auctionId].fromInfo.tokenAddress ); } else { // Else just use the full balance of this contract. return ERC20(auctions[_auctionId].fromInfo.tokenAddress).balanceOf( address(this) ); } } /** * @notice Gets the amount of `want` needed to buy a specific amount of `from`. * @param _auctionId The unique identifier of the auction. * @param _amountToTake The amount of `from` to take in the auction. * @return . The amount of `want` needed to fulfill the take amount. */ function getAmountNeeded( bytes32 _auctionId, uint256 _amountToTake ) external view virtual returns (uint256) { return _getAmountNeeded( auctions[_auctionId], _amountToTake, block.timestamp ); } /** * @notice Gets the amount of `want` needed to buy a specific amount of `from` at a specific timestamp. * @param _auctionId The unique identifier of the auction. * @param _amountToTake The amount `from` to take in the auction. * @param _timestamp The specific timestamp for calculating the amount needed. * @return . The amount of `want` needed to fulfill the take amount. */ function getAmountNeeded( bytes32 _auctionId, uint256 _amountToTake, uint256 _timestamp ) external view virtual returns (uint256) { return _getAmountNeeded(auctions[_auctionId], _amountToTake, _timestamp); } /** * @dev Return the amount of `want` needed to buy `_amountToTake`. */ function _getAmountNeeded( AuctionInfo memory _auction, uint256 _amountToTake, uint256 _timestamp ) internal view virtual returns (uint256) { return // Scale _amountToTake to 1e18 (_amountToTake * _auction.fromInfo.scaler * // Price is always 1e18 _price( _auction.kicked, _auction.initialAvailable * _auction.fromInfo.scaler, _timestamp )) / 1e18 / // Scale back down to want. wantInfo.scaler; } /** * @notice Gets the price of the auction at the current timestamp. * @param _auctionId The unique identifier of the auction. * @return . The price of the auction. */ function price(bytes32 _auctionId) external view virtual returns (uint256) { return price(_auctionId, block.timestamp); } /** * @notice Gets the price of the auction at a specific timestamp. * @param _auctionId The unique identifier of the auction. * @param _timestamp The specific timestamp for calculating the price. * @return . The price of the auction. */ function price( bytes32 _auctionId, uint256 _timestamp ) public view virtual returns (uint256) { // Get unscaled price and scale it down. return _price( auctions[_auctionId].kicked, auctions[_auctionId].initialAvailable * auctions[_auctionId].fromInfo.scaler, _timestamp ) / wantInfo.scaler; } /** * @dev Internal function to calculate the scaled price based on auction parameters. * @param _kicked The timestamp the auction was kicked. * @param _available The initial available amount scaled 1e18. * @param _timestamp The specific timestamp for calculating the price. * @return . The calculated price scaled to 1e18. */ function _price( uint256 _kicked, uint256 _available, uint256 _timestamp ) internal view virtual returns (uint256) { if (_available == 0) return 0; uint256 secondsElapsed = _timestamp - _kicked; if (secondsElapsed > auctionLength) return 0; // Exponential decay from https://github.com/ajna-finance/ajna-core/blob/master/src/libraries/helpers/PoolHelper.sol uint256 hoursComponent = 1e27 >> (secondsElapsed / 3600); uint256 minutesComponent = Maths.rpow( MINUTE_HALF_LIFE, (secondsElapsed % 3600) / 60 ); uint256 initialPrice = Maths.wdiv(startingPrice * 1e18, _available); return (initialPrice * Maths.rmul(hoursComponent, minutesComponent)) / 1e27; } /*////////////////////////////////////////////////////////////// SETTERS //////////////////////////////////////////////////////////////*/ /** * @notice Enables a new auction. * @dev Uses governance as the receiver. * @param _from The address of the token to be auctioned. * @return . The unique identifier of the enabled auction. */ function enable(address _from) external virtual returns (bytes32) { return enable(_from, msg.sender); } /** * @notice Enables a new auction. * @param _from The address of the token to be auctioned. * @param _receiver The address that will receive the funds in the auction. * @return _auctionId The unique identifier of the enabled auction. */ function enable( address _from, address _receiver ) public virtual onlyGovernance returns (bytes32 _auctionId) { address _want = want(); require(_from != address(0) && _from != _want, "ZERO ADDRESS"); require( _receiver != address(0) && _receiver != address(this), "receiver" ); // Cannot have more than 18 decimals. uint256 decimals = ERC20(_from).decimals(); require(decimals <= 18, "unsupported decimals"); // Calculate the id. _auctionId = getAuctionId(_from); require( auctions[_auctionId].fromInfo.tokenAddress == address(0), "already enabled" ); // Store all needed info. auctions[_auctionId].fromInfo = TokenInfo({ tokenAddress: _from, scaler: uint96(WAD / 10 ** decimals) }); auctions[_auctionId].receiver = _receiver; // Add to the array. enabledAuctions.push(_auctionId); emit AuctionEnabled(_auctionId, _from, _want, address(this)); } /** * @notice Disables an existing auction. * @dev Only callable by governance. * @param _from The address of the token being sold. */ function disable(address _from) external virtual { disable(_from, 0); } /** * @notice Disables an existing auction. * @dev Only callable by governance. * @param _from The address of the token being sold. * @param _index The index the auctionId is at in the array. */ function disable( address _from, uint256 _index ) public virtual onlyGovernance { bytes32 _auctionId = getAuctionId(_from); // Make sure the auction was enabled. require( auctions[_auctionId].fromInfo.tokenAddress != address(0), "not enabled" ); // Remove the struct. delete auctions[_auctionId]; // Remove the auction ID from the array. bytes32[] memory _enabledAuctions = enabledAuctions; if (_enabledAuctions[_index] != _auctionId) { // If the _index given is not the id find it. for (uint256 i = 0; i < _enabledAuctions.length; ++i) { if (_enabledAuctions[i] == _auctionId) { _index = i; break; } } } // Move the id to the last spot if not there. if (_index < _enabledAuctions.length - 1) { _enabledAuctions[_index] = _enabledAuctions[ _enabledAuctions.length - 1 ]; // Update the array. enabledAuctions = _enabledAuctions; } // Pop the id off the array. enabledAuctions.pop(); emit AuctionDisabled(_auctionId, _from, want(), address(this)); } /** * @notice Set the flags to be used with hook. * @param _kickable If the kickable hook should be used. * @param _kick If the kick hook should be used. * @param _preTake If the preTake hook should be used. * @param _postTake If the postTake should be used. */ function setHookFlags( bool _kickable, bool _kick, bool _preTake, bool _postTake ) external virtual onlyGovernance { address _hook = hook_.hook; require(_hook != address(0), "no hook set"); hook_ = Hook({ hook: _hook, kickable: _kickable, kick: _kick, preTake: _preTake, postTake: _postTake }); } /*////////////////////////////////////////////////////////////// PARTICIPATE IN AUCTION //////////////////////////////////////////////////////////////*/ /** * @notice Kicks off an auction, updating its status and making funds available for bidding. * @param _auctionId The unique identifier of the auction. * @return available The available amount for bidding on in the auction. */ function kick( bytes32 _auctionId ) external virtual nonReentrant returns (uint256 available) { address _fromToken = auctions[_auctionId].fromInfo.tokenAddress; require(_fromToken != address(0), "not enabled"); require( block.timestamp > auctions[_auctionId].kicked + auctionCooldown, "too soon" ); Hook memory _hook = hook_; // Use hook if defined. if (_hook.kick) { available = IHook(_hook.hook).auctionKicked(_fromToken); } else { // Else just use current balance. available = ERC20(_fromToken).balanceOf(address(this)); } require(available != 0, "nothing to kick"); // Update the auctions status. auctions[_auctionId].kicked = uint96(block.timestamp); auctions[_auctionId].initialAvailable = uint128(available); auctions[_auctionId].currentAvailable = uint128(available); emit AuctionKicked(_auctionId, available); } /** * @notice Take the token being sold in a live auction. * @dev Defaults to taking the full amount and sending to the msg sender. * @param _auctionId The unique identifier of the auction. * @return . The amount of fromToken taken in the auction. */ function take(bytes32 _auctionId) external virtual returns (uint256) { return _take(_auctionId, type(uint256).max, msg.sender, new bytes(0)); } /** * @notice Take the token being sold in a live auction with a specified maximum amount. * @dev Uses the sender's address as the receiver. * @param _auctionId The unique identifier of the auction. * @param _maxAmount The maximum amount of fromToken to take in the auction. * @return . The amount of fromToken taken in the auction. */ function take( bytes32 _auctionId, uint256 _maxAmount ) external virtual returns (uint256) { return _take(_auctionId, _maxAmount, msg.sender, new bytes(0)); } /** * @notice Take the token being sold in a live auction. * @param _auctionId The unique identifier of the auction. * @param _maxAmount The maximum amount of fromToken to take in the auction. * @param _receiver The address that will receive the fromToken. * @return _amountTaken The amount of fromToken taken in the auction. */ function take( bytes32 _auctionId, uint256 _maxAmount, address _receiver ) external virtual returns (uint256) { return _take(_auctionId, _maxAmount, _receiver, new bytes(0)); } /** * @notice Take the token being sold in a live auction. * @param _auctionId The unique identifier of the auction. * @param _maxAmount The maximum amount of fromToken to take in the auction. * @param _receiver The address that will receive the fromToken. * @param _data The data signify the callback should be used and sent with it. * @return _amountTaken The amount of fromToken taken in the auction. */ function take( bytes32 _auctionId, uint256 _maxAmount, address _receiver, bytes calldata _data ) external virtual returns (uint256) { return _take(_auctionId, _maxAmount, _receiver, _data); } /// @dev Implements the take of the auction. function _take( bytes32 _auctionId, uint256 _maxAmount, address _receiver, bytes memory _data ) internal virtual nonReentrant returns (uint256 _amountTaken) { AuctionInfo memory auction = auctions[_auctionId]; // Make sure the auction is active. require( auction.kicked + auctionLength >= block.timestamp, "not kicked" ); // Max amount that can be taken. _amountTaken = auction.currentAvailable > _maxAmount ? _maxAmount : auction.currentAvailable; // Get the amount needed uint256 needed = _getAmountNeeded( auction, _amountTaken, block.timestamp ); require(needed != 0, "zero needed"); // How much is left in this auction. uint256 left; unchecked { left = auction.currentAvailable - _amountTaken; } auctions[_auctionId].currentAvailable = uint128(left); Hook memory _hook = hook_; if (_hook.preTake) { // Use hook if defined. IHook(_hook.hook).preTake( auction.fromInfo.tokenAddress, _amountTaken, needed ); } // Send `from`. ERC20(auction.fromInfo.tokenAddress).safeTransfer( _receiver, _amountTaken ); // If the caller has specified data. if (_data.length != 0) { // Do the callback. ITaker(_receiver).auctionTakeCallback( _auctionId, msg.sender, _amountTaken, needed, _data ); } // Cache the want address. address _want = want(); // Pull `want`. ERC20(_want).safeTransferFrom(msg.sender, auction.receiver, needed); // Post take hook if defined. if (_hook.postTake) { IHook(_hook.hook).postTake(_want, _amountTaken, needed); } emit AuctionTaken(_auctionId, _amountTaken, left); } }
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.