Contract Name:
CashCowsTreasury
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
//-------------------------------------------------------------------------------------------
//
// /$$$$$$ /$$ /$$$$$$
// /$$__ $$ | $$ /$$__ $$
// | $$ \__/ /$$$$$$ /$$$$$$$| $$$$$$$ | $$ \__/ /$$$$$$ /$$ /$$ /$$ /$$$$$$$
// | $$ |____ $$ /$$_____/| $$__ $$ | $$ /$$__ $$| $$ | $$ | $$ /$$_____/
// | $$ /$$$$$$$| $$$$$$ | $$ \ $$ | $$ | $$ \ $$| $$ | $$ | $$| $$$$$$
// | $$ $$ /$$__ $$ \____ $$| $$ | $$ | $$ $$| $$ | $$| $$ | $$ | $$ \____ $$
// | $$$$$$/| $$$$$$$ /$$$$$$$/| $$ | $$ | $$$$$$/| $$$$$$/| $$$$$/$$$$/ /$$$$$$$/
// \______/ \_______/|_______/ |__/ |__/ \______/ \______/ \_____/\___/ |_______/
//
//-------------------------------------------------------------------------------------------
//
// Moo.
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./IRoyaltySplitter.sol";
// ============ Errors ============
error InvalidCall();
// ============ Interfaces ============
interface IERC721OwnsAll is IERC721 {
function ownsAll(
address owner,
uint256[] memory tokenIds
) external view returns(bool);
function totalSupply() external view returns(uint256);
}
// ============ Contract ============
contract CashCowsTreasury is Context, ReentrancyGuard, IRoyaltySplitter {
// ============ Events ============
event PayeeAdded(address account, uint256 shares);
event PaymentReleased(address to, uint256 amount);
event ERC20PaymentReleased(IERC20 indexed token, address to, uint256 amount);
event PaymentReceived(address from, uint256 amount);
// ============ Constants ============
//we are going to need this to find out who owns what
IERC721OwnsAll public immutable COLLECTION;
// ============ Storage ============
//total amount of ETH released
uint256 private _ethTotalReleased;
//amount of ETH released per NFT token id
mapping(uint256 => uint256) private _ethReleased;
//total amount of ERC20 released
mapping(IERC20 => uint256) private _erc20TotalReleased;
//amount of ERC20 released per NFT token id
mapping(IERC20 => mapping(uint256 => uint256)) private _erc20Released;
// ============ Deploy ============
constructor(IERC721OwnsAll collection) payable {
//assign the collection
COLLECTION = collection;
}
/**
* @dev The Ether received will be logged with {PaymentReceived}
* events. Note that these events are not fully reliable: it's
* possible for a contract to receive Ether without triggering this
* function. This only affects the reliability of the events, and not
* the actual splitting of Ether.
*/
receive() external payable virtual {
emit PaymentReceived(_msgSender(), msg.value);
}
// ============ Read Methods ============
/**
* @dev Determines how much ETH are releaseable
*/
function releaseable(uint256 tokenId) public view returns(uint256) {
return _pendingPayment(
address(this).balance + totalReleased(),
released(tokenId)
);
}
/**
* @dev Determines how much ERC20 tokens are releaseable
*/
function releaseable(
IERC20 token,
uint256 tokenId
) public view returns(uint256) {
return _pendingPayment(
token.balanceOf(address(this)) + totalReleased(token),
released(token, tokenId)
);
}
/**
* @dev Returns the sum of ETH releaseable given `tokenIds`
*/
function releaseableBatch(
uint256[] memory tokenIds
) external view returns(uint256 totalReleaseable) {
for(uint256 i = 0; i < tokenIds.length; i++) {
//get payment and should be more than zero
totalReleaseable += releaseable(tokenIds[i]);
}
}
/**
* @dev Returns the sum of ERC20 tokens releaseable given `tokenIds`
*/
function releaseableBatch(
IERC20 token,
uint256[] memory tokenIds
) external view returns(uint256 totalReleaseable) {
for(uint256 i = 0; i < tokenIds.length; i++) {
//get payment and should be more than zero
totalReleaseable += releaseable(token, tokenIds[i]);
}
}
/**
* @dev Getter for the total amount of Ether already released.
*/
function totalReleased() public view returns(uint256) {
return _ethTotalReleased;
}
/**
* @dev Getter for the total amount of `token` already released.
* `token` should be the address of an IERC20 contract.
*/
function totalReleased(IERC20 token) public view returns(uint256) {
return _erc20TotalReleased[token];
}
/**
* @dev Getter for the amount of shares held by an account.
*/
function shares(address account) external view returns(uint256) {
return COLLECTION.balanceOf(account);
}
/**
* @dev Getter for the amount of Ether already released to the `tokenId`.
*/
function released(uint256 tokenId) public view returns(uint256) {
return _ethReleased[tokenId];
}
/**
* @dev Getter for the amount of `token` tokens already released to a
* `tokenId`. `token` should be the address of an IERC20 contract.
*/
function released(IERC20 token, uint256 tokenId) public view returns(uint256) {
return _erc20Released[token][tokenId];
}
/**
* @dev Getter for the address of the payee via `tokenId`.
*/
function payee(uint256 tokenId) public view returns(address) {
return COLLECTION.ownerOf(tokenId);
}
// ============ Write Methods ============
/**
* @dev Triggers a transfer to owner of `tokenId` of the amount of
* Ether they are owed, according to their percentage of the total
* shares and their previous withdrawals.
*/
function release(uint256 tokenId) external nonReentrant {
//get account and should be the sender
address account = payee(tokenId);
if (account != _msgSender()) revert InvalidCall();
//get payment and should be more than zero
uint256 payment = releaseable(tokenId);
if (payment == 0) revert InvalidCall();
//add released payment
_ethReleased[tokenId] += payment;
_ethTotalReleased += payment;
//send it off.. buh bye!
Address.sendValue(payable(account), payment);
//let everyone know what happened
emit PaymentReleased(account, payment);
}
/**
* @dev Triggers a transfer to `account` of the amount of `token`
* tokens they are owed, according to their percentage of the total
* shares and their previous withdrawals. `token` must be the address
* of an IERC20 contract.
*/
function release(IERC20 token, uint256 tokenId) external nonReentrant {
//get account and should be the sender
address account = payee(tokenId);
if (account != _msgSender()) revert InvalidCall();
//get payment and should be more than zero
uint256 payment = releaseable(token, tokenId);
if (payment == 0) revert InvalidCall();
//add released payment
_erc20Released[token][tokenId] += payment;
_erc20TotalReleased[token] += payment;
//send it off.. buh bye!
SafeERC20.safeTransfer(token, payable(account), payment);
//let everyone know what happened
emit ERC20PaymentReleased(token, account, payment);
}
/**
* @dev Triggers a batch transfer to owner of `tokenId` of the amount
* of Ether they are owed, according to their percentage of the total
* shares and their previous withdrawals.
*/
function releaseBatch(uint256[] memory tokenIds) public virtual {
//get account and should be the owner
address account = _msgSender();
if (!COLLECTION.ownsAll(_msgSender(), tokenIds)) revert InvalidCall();
uint256 payment;
uint256 totalPayment;
for(uint256 i = 0; i < tokenIds.length; i++) {
//get payment and should be more than zero
payment = releaseable(tokenIds[i]);
//skip if noting is releaseable
if (payment == 0) continue;
//add released payment
_ethReleased[tokenIds[i]] += payment;
//add to total payment
totalPayment += payment;
}
//if no payments are due
if (totalPayment == 0) revert InvalidCall();
//add released payment
_ethTotalReleased += totalPayment;
//send it off.. buh bye!
Address.sendValue(payable(account), totalPayment);
//let everyone know what happened
emit PaymentReleased(account, totalPayment);
}
/**
* @dev Triggers a batch transfer to `account` of the amount of `token`
* tokens they are owed, according to their percentage of the total
* shares and their previous withdrawals. `token` must be the address
* of an IERC20 contract.
*/
function releaseBatch(
IERC20 token,
uint256[] memory tokenIds
) external nonReentrant {
//get account and should be the owner
address account = _msgSender();
if (!COLLECTION.ownsAll(_msgSender(), tokenIds)) revert InvalidCall();
uint256 payment;
uint256 totalPayment;
for(uint256 i = 0; i < tokenIds.length; i++) {
//get payment and should be more than zero
payment = releaseable(token, tokenIds[i]);
//skip if noting is releaseable
if (payment == 0) continue;
//add released payment
_erc20Released[token][tokenIds[i]] += payment;
//add to total payment
totalPayment += payment;
}
//if no payments are due
if (totalPayment == 0) revert InvalidCall();
//add released payment
_erc20TotalReleased[token] += totalPayment;
//send it off.. buh bye!
SafeERC20.safeTransfer(token, payable(account), totalPayment);
//let everyone know what happened
emit ERC20PaymentReleased(token, account, payment);
}
/**
* @dev internal logic for computing the pending payment of an `account` given the token historical balances and
* already released amounts.
*/
function _pendingPayment(
uint256 totalReceived,
uint256 alreadyReleased
) private view returns(uint256) {
uint256 amount = totalReceived / COLLECTION.totalSupply();
if (amount < alreadyReleased) return 0;
return amount - alreadyReleased;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.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;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
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));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
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");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @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");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* 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 Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @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 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);
/**
* @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;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
* @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
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 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://diligence.consensys.net/posts/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 functionCall(target, data, "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");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(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) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(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) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason 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 {
// 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
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 (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() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IRoyaltySplitter {
function releaseable(uint256 tokenId) external view returns(uint256);
function releaseable(IERC20 token, uint256 tokenId) external view returns(uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @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);
}
// 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);
}