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Contract Name:
XSteak
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @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; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @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 {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @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. */ 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]. */ 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to * 0 before setting it to a non-zero value. */ 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)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external; /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721 * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must * understand this adds an external call which potentially creates a reentrancy vulnerability. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 tokenId) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool approved) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (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); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with 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; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol) pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the subtraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol) // This file was procedurally generated from scripts/generate/templates/EnumerableSet.js. pragma solidity ^0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ```solidity * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. * * [WARNING] * ==== * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure * unusable. * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info. * * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an * array of EnumerableSet. * ==== */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; if (lastIndex != toDeleteIndex) { bytes32 lastValue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastValue; // Update the index for the moved value set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { return set._values[index]; } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function _values(Set storage set) private view returns (bytes32[] memory) { return set._values; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(Bytes32Set storage set) internal view returns (bytes32[] memory) { bytes32[] memory store = _values(set._inner); bytes32[] memory result; /// @solidity memory-safe-assembly assembly { result := store } return result; } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(AddressSet storage set) internal view returns (address[] memory) { bytes32[] memory store = _values(set._inner); address[] memory result; /// @solidity memory-safe-assembly assembly { result := store } return result; } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values in the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } /** * @dev Return the entire set in an array * * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that * this function has an unbounded cost, and using it as part of a state-changing function may render the function * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block. */ function values(UintSet storage set) internal view returns (uint256[] memory) { bytes32[] memory store = _values(set._inner); uint256[] memory result; /// @solidity memory-safe-assembly assembly { result := store } return result; } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; interface IXSteakTokenUsage { function allocate( address userAddress, uint256 amount, bytes calldata data ) external; function deallocate( address userAddress, uint256 amount, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "openzeppelin/token/ERC20/IERC20.sol"; interface IXSteakToken is IERC20 { function usageAllocations( address userAddress, address usageAddress ) external view returns (uint256 allocation); function allocateFromUsage(address userAddress, uint256 amount) external; function convertTo(uint256 amount, address to) external; function deallocateFromUsage(address userAddress, uint256 amount) external; function isTransferWhitelisted( address account ) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "openzeppelin/access/Ownable.sol"; import "openzeppelin/token/ERC20/utils/SafeERC20.sol"; import "openzeppelin/security/ReentrancyGuard.sol"; import "openzeppelin/utils/math/SafeMath.sol"; import "openzeppelin/utils/structs/EnumerableSet.sol"; import "openzeppelin/token/ERC721/IERC721.sol"; /* * Simple allowlist which checks if NFT collection is held by a user. * by @SteakHut Finance */ contract AllowList is Ownable { using SafeMath for uint256; using SafeERC20 for IERC20; using EnumerableSet for EnumerableSet.AddressSet; // NFT collection addresses to whitelist from paying deallocation fee EnumerableSet.AddressSet private whitelistedCollections; constructor() {} /********************************************/ /****************** EVENTS ******************/ /********************************************/ event WhitelistCollection(address collection); event RemoveCollection(address collection); /********************************************/ /****************** VIEW ******************/ /********************************************/ /// @notice Returns the type id at index `_index` where whitelist has a non-zero balance /// @param _index The position index /// @return The non-zero position at index `_index` function whitelistCollectionPositionAtIndex( uint256 _index ) external view returns (address) { return whitelistedCollections.at(_index); } /// @notice Returns the number of whitelisted NFT collections /// @return The number of whitelisted NFT collections function whitelistCollectionPositionNumber() external view returns (uint256) { return whitelistedCollections.length(); } /// @notice Returns if the user holds NFT collection /// @return isAllowListed true if user hold collection function isAllowlisted( address user ) external view returns (bool isAllowListed) { for (uint i = 0; i < whitelistedCollections.length(); i++) { if ( address(whitelistedCollections.at(i)) != address(0) && IERC721(whitelistedCollections.at(i)).balanceOf(user) > 0 && user == tx.origin ) { isAllowListed = true; } } } /********************************************/ /****************** OWNER ******************/ /********************************************/ /** * @dev Adds a NFT collection to the whitelist */ function addWhitelistedCollection(address collection) external onlyOwner { require( collection != address(0), "addWhitelistedCollection: Cannot whitelist 0 address" ); whitelistedCollections.add(collection); emit WhitelistCollection(collection); } /** * @dev removes a NFT collection from the whitelist */ function removeWhitelistedCollection( address collection ) external onlyOwner { require( collection != address(0), "removeWhitelistedCollection: Cannot remove whitelist of 0 address" ); whitelistedCollections.remove(collection); emit RemoveCollection(collection); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "openzeppelin/access/Ownable.sol"; import "openzeppelin/utils/math/SafeMath.sol"; import "openzeppelin/token/ERC20/utils/SafeERC20.sol"; import "openzeppelin/token/ERC20/ERC20.sol"; import "openzeppelin/token/ERC20/IERC20.sol"; import "openzeppelin/security/ReentrancyGuard.sol"; import "openzeppelin/utils/structs/EnumerableSet.sol"; import "./interfaces/tokens/IXSteakToken.sol"; import "./interfaces/IXSteakTokenUsage.sol"; import "./plugins/allowList.sol"; /* * xSTEAK is SteakHuts escrowed governance token obtainable by converting STEAK to it * It's non-transferable, except from/to whitelisted addresses * It can be converted back to STEAK through a vesting process * This contract is made to receive xSTEAK deposits from users in order to allocate them to Usages (plugins) contracts * All Credit to the Camelot Dex team! * STEAK will be stuck in this contract in place of burning. * If holder has a STEAK.JPEG allows for a reduced redemption fee %. (can also whitelist future collections) */ contract XSteak is Ownable, ReentrancyGuard, ERC20("STEAK escrowed token", "xSTEAK"), IXSteakToken { using Address for address; using SafeMath for uint256; using EnumerableSet for EnumerableSet.AddressSet; using SafeERC20 for IERC20; struct XSteakBalance { uint256 allocatedAmount; // Amount of xSTEAK allocated to a Usage uint256 redeemingAmount; // Total amount of xSTEAK currently being redeemed } struct RedeemInfo { uint256 steakAmount; // STEAK amount to receive when vesting has ended uint256 xSteakAmount; // xSTEAK amount to redeem uint256 endTime; IXSteakTokenUsage dividendsAddress; uint256 dividendsAllocation; // Share of redeeming xSTEAK to allocate to the Dividends Usage contract } IERC20 public immutable steakToken; // STEAK token to convert to/from IXSteakTokenUsage public dividendsAddress; // SteakHut dividends contract EnumerableSet.AddressSet private _transferWhitelist; // addresses allowed to send/receive xSTEAK address public allowListAddress; // SteakHut allowlist contract address mapping(address => mapping(address => uint256)) public usageApprovals; // Usage approvals to allocate xSTEAK mapping(address => mapping(address => uint256)) public override usageAllocations; // Active xSTEAK allocations to usages uint256 public constant MAX_DEALLOCATION_FEE = 200; // 2% mapping(address => uint256) public usagesDeallocationFee; // Fee paid when deallocating xSTEAK uint256 public constant MAX_FIXED_RATIO = 100; // 100% // Redeeming min/max settings uint256 public minRedeemRatio = 50; // 1:0.5 uint256 public maxRedeemRatio = 100; // 1:1 uint256 public minRedeemDuration = 15 days; // 1296000s uint256 public maxRedeemDuration = 90 days; // 7776000s // Adjusted dividends rewards for redeeming xSTEAK uint256 public redeemDividendsAdjustment = 50; // 50% mapping(address => XSteakBalance) public XSteakBalances; // User's xSTEAK balances mapping(address => RedeemInfo[]) public userRedeems; // User's redeeming instances constructor(IERC20 steakToken_) { steakToken = steakToken_; _transferWhitelist.add(address(this)); } /********************************************/ /****************** EVENTS ******************/ /********************************************/ event ApproveUsage( address indexed userAddress, address indexed usageAddress, uint256 amount ); event Convert(address indexed from, address to, uint256 amount); event UpdateRedeemSettings( uint256 minRedeemRatio, uint256 maxRedeemRatio, uint256 minRedeemDuration, uint256 maxRedeemDuration, uint256 redeemDividendsAdjustment ); event UpdateDividendsAddress( address previousDividendsAddress, address newDividendsAddress ); event UpdateDeallocationFee(address indexed usageAddress, uint256 fee); event SetTransferWhitelist(address account, bool add); event Redeem( address indexed userAddress, uint256 xSteakAmount, uint256 steakAmount, uint256 duration ); event FinalizeRedeem( address indexed userAddress, uint256 xSteakAmount, uint256 steakAmount ); event CancelRedeem(address indexed userAddress, uint256 xSteakAmount); event UpdateRedeemDividendsAddress( address indexed userAddress, uint256 redeemIndex, address previousDividendsAddress, address newDividendsAddress ); event Allocate( address indexed userAddress, address indexed usageAddress, uint256 amount ); event Deallocate( address indexed userAddress, address indexed usageAddress, uint256 amount, uint256 fee ); event SetAllowList(address allowList); event TransferExcess(uint256 amount, address recipient); /***********************************************/ /****************** MODIFIERS ******************/ /***********************************************/ /* * @dev Check if a redeem entry exists */ modifier validateRedeem(address userAddress, uint256 redeemIndex) { require( redeemIndex < userRedeems[userAddress].length, "validateRedeem: redeem entry does not exist" ); _; } /**************************************************/ /****************** PUBLIC VIEWS ******************/ /**************************************************/ /* * @dev Returns user's xSTEAK balances */ function getXSteakBalance( address userAddress ) external view returns (uint256 allocatedAmount, uint256 redeemingAmount) { XSteakBalance storage balance = XSteakBalances[userAddress]; return (balance.allocatedAmount, balance.redeemingAmount); } /* * @dev returns redeemable STEAK for "amount" of xSTEAK vested for "duration" seconds */ function getSteakByVestingDuration( uint256 amount, uint256 duration ) public view returns (uint256) { if (duration < minRedeemDuration) { return 0; } // capped to maxRedeemDuration if (duration > maxRedeemDuration) { return amount.mul(maxRedeemRatio).div(100); } //otherwise the ratio is a factor of time uint256 ratio = minRedeemRatio.add( (duration.sub(minRedeemDuration)) .mul(maxRedeemRatio.sub(minRedeemRatio)) .div(maxRedeemDuration.sub(minRedeemDuration)) ); return amount.mul(ratio).div(100); } /** * @dev returns quantity of "userAddress" pending redeems */ function getUserRedeemsLength( address userAddress ) external view returns (uint256) { return userRedeems[userAddress].length; } /** * @dev returns "userAddress" info for a pending redeem identified by "redeemIndex" */ function getUserRedeem( address userAddress, uint256 redeemIndex ) external view validateRedeem(userAddress, redeemIndex) returns ( uint256 steakAmount, uint256 xSteakAmount, uint256 endTime, address dividendsContract, uint256 dividendsAllocation ) { RedeemInfo storage _redeem = userRedeems[userAddress][redeemIndex]; return ( _redeem.steakAmount, _redeem.xSteakAmount, _redeem.endTime, address(_redeem.dividendsAddress), _redeem.dividendsAllocation ); } /** * @dev returns approved xSTEAK to allocate from "userAddress" to "usageAddress" */ function getUsageApproval( address userAddress, address usageAddress ) external view returns (uint256) { return usageApprovals[userAddress][usageAddress]; } /** * @dev returns allocated xSTEAK from "userAddress" to "usageAddress" */ function getUsageAllocation( address userAddress, address usageAddress ) external view returns (uint256) { return usageAllocations[userAddress][usageAddress]; } /** * @dev returns length of transferWhitelist array */ function transferWhitelistLength() external view returns (uint256) { return _transferWhitelist.length(); } /** * @dev returns transferWhitelist array item's address for "index" */ function transferWhitelist(uint256 index) external view returns (address) { return _transferWhitelist.at(index); } /** * @dev returns if "account" is allowed to send/receive xSTEAK */ function isTransferWhitelisted( address account ) external view override returns (bool) { return _transferWhitelist.contains(account); } /*******************************************************/ /****************** OWNABLE FUNCTIONS ******************/ /*******************************************************/ /** * @dev Updates all redeem ratios and durations * * Must only be called by owner */ function updateRedeemSettings( uint256 minRedeemRatio_, uint256 maxRedeemRatio_, uint256 minRedeemDuration_, uint256 maxRedeemDuration_, uint256 redeemDividendsAdjustment_ ) external onlyOwner { require( minRedeemRatio_ <= maxRedeemRatio_, "updateRedeemSettings: wrong ratio values" ); require( minRedeemDuration_ < maxRedeemDuration_, "updateRedeemSettings: wrong duration values" ); // should never exceed 100% require( maxRedeemRatio_ <= MAX_FIXED_RATIO && redeemDividendsAdjustment_ <= MAX_FIXED_RATIO, "updateRedeemSettings: wrong ratio values" ); minRedeemRatio = minRedeemRatio_; maxRedeemRatio = maxRedeemRatio_; minRedeemDuration = minRedeemDuration_; maxRedeemDuration = maxRedeemDuration_; redeemDividendsAdjustment = redeemDividendsAdjustment_; emit UpdateRedeemSettings( minRedeemRatio_, maxRedeemRatio_, minRedeemDuration_, maxRedeemDuration_, redeemDividendsAdjustment_ ); } /** * @dev Updates dividends contract address * * Must only be called by owner */ function updateDividendsAddress( IXSteakTokenUsage dividendsAddress_ ) external onlyOwner { // if set to 0, also set divs earnings while redeeming to 0 if (address(dividendsAddress_) == address(0)) { redeemDividendsAdjustment = 0; } emit UpdateDividendsAddress( address(dividendsAddress), address(dividendsAddress_) ); dividendsAddress = dividendsAddress_; } /** * @dev Updates fee paid by users when deallocating from "usageAddress" */ function updateDeallocationFee( address usageAddress, uint256 fee ) external onlyOwner { require(fee <= MAX_DEALLOCATION_FEE, "updateDeallocationFee: too high"); usagesDeallocationFee[usageAddress] = fee; emit UpdateDeallocationFee(usageAddress, fee); } /** * @dev Adds or removes addresses from the transferWhitelist */ function updateTransferWhitelist( address account, bool add ) external onlyOwner { require( account != address(this), "updateTransferWhitelist: Cannot remove xSteak from whitelist" ); if (add) _transferWhitelist.add(account); else _transferWhitelist.remove(account); emit SetTransferWhitelist(account, add); } /** * @dev updates the address of the allowList contract */ function updateAllowListAddress( address _allowListAddress ) external onlyOwner { require( _allowListAddress != address(0), "updateAllowListAddress: no 0 address" ); allowListAddress = _allowListAddress; emit SetAllowList(allowListAddress); } /// @notice Rescues funds from contract /// @param _token address of the token to rescue. function inCaseTokensGetStuck(address _token) external onlyOwner { uint256 amount = IERC20(_token).balanceOf(address(this)); IERC20(_token).safeTransfer(msg.sender, amount); } /// @notice Removes excess steak from the contract /// @param _recipient address to send excess steak to function removeExcessSteak(address _recipient) external onlyOwner { uint256 steakAmount = steakToken.balanceOf(address(this)); uint256 xSteakAmount = totalSupply(); require(steakAmount > xSteakAmount, "xSTEAK: no excess STEAK"); uint256 excessSteak = steakAmount - xSteakAmount; steakToken.safeTransfer(_recipient, excessSteak); emit TransferExcess(excessSteak, _recipient); } /*****************************************************************/ /****************** EXTERNAL PUBLIC FUNCTIONS ******************/ /*****************************************************************/ /** * @dev Approves "usage" address to get allocations up to "amount" of xSTEAK from msg.sender */ function approveUsage( IXSteakTokenUsage usage, uint256 amount ) external nonReentrant { require( address(usage) != address(0), "approveUsage: approve to the zero address" ); usageApprovals[msg.sender][address(usage)] = amount; emit ApproveUsage(msg.sender, address(usage), amount); } /** * @dev Convert caller's "amount" of STEAK to xSTEAK */ function convert(uint256 amount) external nonReentrant { _convert(amount, msg.sender); } /** * @dev Convert caller's "amount" of STEAK to xSTEAK to "to" address */ function convertTo( uint256 amount, address to ) external override nonReentrant { require(address(msg.sender).isContract(), "convertTo: not allowed"); _convert(amount, to); } /** * @dev Initiates redeem process (xSTEAK to STEAK) * * Handles dividends' compensation allocation during the vesting process if needed */ function redeem( uint256 xSteakAmount, uint256 duration ) external nonReentrant { require(xSteakAmount > 0, "redeem: xSteakAmount cannot be null"); require(duration >= minRedeemDuration, "redeem: duration too low"); _transfer(msg.sender, address(this), xSteakAmount); XSteakBalance storage balance = XSteakBalances[msg.sender]; // get corresponding STEAK amount uint256 steakAmount = getSteakByVestingDuration(xSteakAmount, duration); emit Redeem(msg.sender, xSteakAmount, steakAmount, duration); // if redeeming is not immediate, go through vesting process if (duration > 0) { // add to SBT total balance.redeemingAmount = balance.redeemingAmount.add(xSteakAmount); // handle dividends during the vesting process uint256 dividendsAllocation = xSteakAmount .mul(redeemDividendsAdjustment) .div(100); // only if compensation is active if (dividendsAllocation > 0) { // allocate to dividends dividendsAddress.allocate( msg.sender, dividendsAllocation, new bytes(0) ); } // add redeeming entry userRedeems[msg.sender].push( RedeemInfo( steakAmount, xSteakAmount, _currentBlockTimestamp().add(duration), dividendsAddress, dividendsAllocation ) ); } else { // immediately redeem for STEAK _finalizeRedeem(msg.sender, xSteakAmount, steakAmount); } } /** * @dev Finalizes redeem process when vesting duration has been reached * * Can only be called by the redeem entry owner */ function finalizeRedeem( uint256 redeemIndex ) external nonReentrant validateRedeem(msg.sender, redeemIndex) { XSteakBalance storage balance = XSteakBalances[msg.sender]; RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; require( _currentBlockTimestamp() >= _redeem.endTime, "finalizeRedeem: vesting duration has not ended yet" ); // remove from SBT total balance.redeemingAmount = balance.redeemingAmount.sub( _redeem.xSteakAmount ); _finalizeRedeem(msg.sender, _redeem.xSteakAmount, _redeem.steakAmount); // handle dividends compensation if any was active if (_redeem.dividendsAllocation > 0) { // deallocate from dividends IXSteakTokenUsage(_redeem.dividendsAddress).deallocate( msg.sender, _redeem.dividendsAllocation, new bytes(0) ); } // remove redeem entry _deleteRedeemEntry(redeemIndex); } /** * @dev Updates dividends address for an existing active redeeming process * * Can only be called by the involved user * Should only be used if dividends contract was to be migrated */ function updateRedeemDividendsAddress( uint256 redeemIndex ) external nonReentrant validateRedeem(msg.sender, redeemIndex) { RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; // only if the active dividends contract is not the same anymore if ( dividendsAddress != _redeem.dividendsAddress && address(dividendsAddress) != address(0) ) { if (_redeem.dividendsAllocation > 0) { // deallocate from old dividends contract _redeem.dividendsAddress.deallocate( msg.sender, _redeem.dividendsAllocation, new bytes(0) ); // allocate to new used dividends contract dividendsAddress.allocate( msg.sender, _redeem.dividendsAllocation, new bytes(0) ); } emit UpdateRedeemDividendsAddress( msg.sender, redeemIndex, address(_redeem.dividendsAddress), address(dividendsAddress) ); _redeem.dividendsAddress = dividendsAddress; } } /** * @dev Cancels an ongoing redeem entry * * Can only be called by its owner */ function cancelRedeem( uint256 redeemIndex ) external nonReentrant validateRedeem(msg.sender, redeemIndex) { XSteakBalance storage balance = XSteakBalances[msg.sender]; RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; // make redeeming xSTEAK available again balance.redeemingAmount = balance.redeemingAmount.sub( _redeem.xSteakAmount ); _transfer(address(this), msg.sender, _redeem.xSteakAmount); // handle dividends compensation if any was active if (_redeem.dividendsAllocation > 0) { // deallocate from dividends IXSteakTokenUsage(_redeem.dividendsAddress).deallocate( msg.sender, _redeem.dividendsAllocation, new bytes(0) ); } emit CancelRedeem(msg.sender, _redeem.xSteakAmount); // remove redeem entry _deleteRedeemEntry(redeemIndex); } /** * @dev Allocates caller's "amount" of available xSTEAK to "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function allocate( address usageAddress, uint256 amount, bytes calldata usageData ) external nonReentrant { _allocate(msg.sender, usageAddress, amount); // allocates xSTEAK to usageContract IXSteakTokenUsage(usageAddress).allocate(msg.sender, amount, usageData); } /** * @dev Allocates "amount" of available xSTEAK from "userAddress" to caller (ie usage contract) * * Caller must have an allocation approval for the required xSteak xSTEAK from "userAddress" */ function allocateFromUsage( address userAddress, uint256 amount ) external override nonReentrant { _allocate(userAddress, msg.sender, amount); } /** * @dev Deallocates caller's "amount" of available xSTEAK from "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function deallocate( address usageAddress, uint256 amount, bytes calldata usageData ) external nonReentrant { _deallocate(msg.sender, usageAddress, amount); // deallocate xSTEAK into usageContract IXSteakTokenUsage(usageAddress).deallocate( msg.sender, amount, usageData ); } /** * @dev Deallocates "amount" of allocated xSTEAK belonging to "userAddress" from caller (ie usage contract) * * Caller can only deallocate xSTEAK from itself */ function deallocateFromUsage( address userAddress, uint256 amount ) external override nonReentrant { _deallocate(userAddress, msg.sender, amount); } /********************************************************/ /****************** INTERNAL FUNCTIONS ******************/ /********************************************************/ /** * @dev Convert caller's "amount" of STEAK into xSTEAK to "to" */ function _convert(uint256 amount, address to) internal { require(amount != 0, "convert: amount cannot be null"); steakToken.safeTransferFrom(msg.sender, address(this), amount); // mint new xSTEAK _mint(to, amount); emit Convert(msg.sender, to, amount); } /** * @dev Finalizes the redeeming process for "userAddress" by transferring him "steakAmount" and removing "xSteakAmount" from supply * * Any vesting check should be ran before calling this * STEAK excess is retained in this contract */ function _finalizeRedeem( address userAddress, uint256 xSteakAmount, uint256 steakAmount ) internal { // sends due STEAK tokens steakToken.safeTransfer(userAddress, steakAmount); // burns STEAK excess if any (stuck in this contract) _burn(address(this), xSteakAmount); emit FinalizeRedeem(userAddress, xSteakAmount, steakAmount); } /** * @dev Allocates "userAddress" user's "amount" of available xSTEAK to "usageAddress" contract * */ function _allocate( address userAddress, address usageAddress, uint256 amount ) internal { require(amount > 0, "allocate: amount cannot be null"); XSteakBalance storage balance = XSteakBalances[userAddress]; // approval checks if allocation request amount has been approved by userAddress to be allocated to this usageAddress uint256 approvedXSteak = usageApprovals[userAddress][usageAddress]; require(approvedXSteak >= amount, "allocate: non authorized amount"); // remove allocated amount from usage's approved amount usageApprovals[userAddress][usageAddress] = approvedXSteak.sub(amount); // update usage's allocatedAmount for userAddress usageAllocations[userAddress][usageAddress] = usageAllocations[ userAddress ][usageAddress].add(amount); // adjust user's xSTEAK balances balance.allocatedAmount = balance.allocatedAmount.add(amount); _transfer(userAddress, address(this), amount); emit Allocate(userAddress, usageAddress, amount); } /** * @dev Deallocates "amount" of available xSTEAK to "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function _deallocate( address userAddress, address usageAddress, uint256 amount ) internal { require(amount > 0, "deallocate: amount cannot be null"); // check if there is enough allocated xSTEAK to this usage to deallocate uint256 allocatedAmount = usageAllocations[userAddress][usageAddress]; require(allocatedAmount >= amount, "deallocate: non authorized amount"); // remove deallocated amount from usage's allocation usageAllocations[userAddress][usageAddress] = allocatedAmount.sub( amount ); uint256 deallocationFeeAmount = amount .mul(usagesDeallocationFee[usageAddress]) .div(10000); //remove the deallocation fee if user holds an allowlist if (AllowList(allowListAddress).isAllowlisted(msg.sender)) { deallocationFeeAmount = 0; } // adjust user's xSTEAK balances XSteakBalance storage balance = XSteakBalances[userAddress]; balance.allocatedAmount = balance.allocatedAmount.sub(amount); _transfer( address(this), userAddress, amount.sub(deallocationFeeAmount) ); // burn corresponding xSTEAK _burn(address(this), deallocationFeeAmount); emit Deallocate( userAddress, usageAddress, amount, deallocationFeeAmount ); } function _deleteRedeemEntry(uint256 index) internal { userRedeems[msg.sender][index] = userRedeems[msg.sender][ userRedeems[msg.sender].length - 1 ]; userRedeems[msg.sender].pop(); } /** * @dev Hook override to forbid transfers except from whitelisted addresses and minting */ function _beforeTokenTransfer( address from, address to, uint256 /*amount*/ ) internal view override { require( from == address(0) || _transferWhitelist.contains(from) || _transferWhitelist.contains(to), "transfer: not allowed" ); } /** * @dev Utility function to get the current block timestamp */ function _currentBlockTimestamp() internal view virtual returns (uint256) { /* solhint-disable not-rely-on-time */ return block.timestamp; } }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000b279f8dd152b99ec1d84a489d32c35bc0c7f5674
-----Decoded View---------------
Arg [0] : steakToken_ (address): 0xb279f8dd152b99ec1d84a489d32c35bc0c7f5674
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b279f8dd152b99ec1d84a489d32c35bc0c7f5674
Age | Block | Fee Address | BC Fee Address | Voting Power | Jailed | Incoming |
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