Contract Name:
TraitSwapping
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 v4.7.0) (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
require(paused(), "Pausable: not paused");
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 v4.5.0) (token/ERC1155/IERC1155Receiver.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev _Available since v3.1._
*/
interface IERC1155Receiver is IERC165 {
/**
* @dev Handles the receipt of a single ERC1155 token type. This function is
* called at the end of a `safeTransferFrom` after the balance has been updated.
*
* NOTE: To accept the transfer, this must return
* `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
* (i.e. 0xf23a6e61, or its own function selector).
*
* @param operator The address which initiated the transfer (i.e. msg.sender)
* @param from The address which previously owned the token
* @param id The ID of the token being transferred
* @param value The amount of tokens being transferred
* @param data Additional data with no specified format
* @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
*/
function onERC1155Received(
address operator,
address from,
uint256 id,
uint256 value,
bytes calldata data
) external returns (bytes4);
/**
* @dev Handles the receipt of a multiple ERC1155 token types. This function
* is called at the end of a `safeBatchTransferFrom` after the balances have
* been updated.
*
* NOTE: To accept the transfer(s), this must return
* `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
* (i.e. 0xbc197c81, or its own function selector).
*
* @param operator The address which initiated the batch transfer (i.e. msg.sender)
* @param from The address which previously owned the token
* @param ids An array containing ids of each token being transferred (order and length must match values array)
* @param values An array containing amounts of each token being transferred (order and length must match ids array)
* @param data Additional data with no specified format
* @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
*/
function onERC1155BatchReceived(
address operator,
address from,
uint256[] calldata ids,
uint256[] calldata values,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 v4.9.0) (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 (last updated v4.9.3) (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. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// 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
//
// @@@@@@@@@@ @@@@@@@ @@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@
// @@@@@@@@@@@@ @@@@@@@ .@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@ @@@@@@@ @@@@@@@ @@@@@@ @@@@@@
// @@@@@@@ @@@@@@@ @@@@@@@ @@@@@@@ @@@@@@@@@@@
// @@@@@@@ @@@@@@@ @@@@@@ @@@@@@ @@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@ @@@@@@@ @@@@@@@ #@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@ @@@@@@@ @@@@@@@ @@@@@@@ @@@@@@#
// @@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@ @@@@@@@ @@@@@@@@@@@@@@@@@
// @@@@@@@ @@@@@@ @@@@@@@@@@@@@@@@ @@@@@@@ @@@@@@@@@@@@
pragma solidity ^0.8.21;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
interface IRVM {
function burn(address account, uint256 id, uint256 value) external;
function isApprovedForAll(address account, address operator) external view returns (bool);
}
interface IALTS {
function ownerOf(uint256 tokenId) external view returns (address);
}
contract TraitSwapping is Ownable, Pausable, ReentrancyGuard, IERC1155Receiver {
using SafeERC20 for IERC20;
IERC20 public immutable APE;
IRVM public immutable RVM;
IALTS public immutable ALTS;
IERC20 public immutable WETH;
enum Currency {
ETH,
WETH,
APE,
RVM
}
enum OrderStatus {
UNSET,
PENDING,
ACCEPTED,
CANCELED
}
struct Order {
address buyer;
uint96 amount;
address seller;
uint32 expiresAt;
uint24 id;
uint16 buyerAlt;
uint16 sellerAlt;
OrderStatus status;
}
struct Transfer {
address buyer;
uint16[3] buyerAlts;
uint16[3] sellerAlts;
address seller;
uint72 amount;
uint24 id;
}
struct Exchange {
uint72 rateApe;
uint56 rateEth;
uint56 minFee;
uint56 minOrder;
uint8 rateRvm;
uint8 fee;
}
Exchange public exchange;
address payable public receiver;
address public permittedOperator;
bool public pointsTransfers = false;
uint32 public expiryPeriod;
uint24 public totalOrders = 0;
uint24 public totalTransfers = 0;
mapping(address => uint256) public points;
mapping(uint56 => Order) public orders;
mapping(uint96 => Transfer) private transfers;
event PointsPurchase(
address indexed user,
Currency indexed currency,
uint256 value,
uint256 indexed points,
uint256 currentPointsBalance
);
event TransferPoints(address indexed sender, address indexed receiver, uint256 amount);
event TransferWETH(uint96 indexed id, address indexed buyer, address indexed seller, uint256 amount, uint256 fee);
event OrderCreated(
uint56 indexed orderId,
address indexed buyer,
address indexed seller,
uint256 amount,
uint32 expiresAt
);
event OrderFulfilled(uint56 indexed orderId);
event OrderCanceled(uint56 indexed orderId, address indexed buyer, address indexed seller, uint256 amount);
constructor(
uint56 _rateEth,
uint72 _rateApe,
uint8 _rateRvm,
uint56 _minFee,
uint56 _minOrder,
uint8 _fee,
uint32 _expiryPeriod,
address _ape,
address _rvm,
address _weth,
address _alts,
address _permittedOperator,
address payable _receiver
) {
exchange.rateEth = _rateEth;
exchange.rateApe = _rateApe;
exchange.rateRvm = _rateRvm;
exchange.minFee = _minFee;
exchange.minOrder = _minOrder;
exchange.fee = _fee;
expiryPeriod = _expiryPeriod;
APE = IERC20(_ape);
RVM = IRVM(_rvm);
WETH = IERC20(_weth);
ALTS = IALTS(_alts);
permittedOperator = _permittedOperator;
receiver = _receiver;
}
modifier onlyPermittedOperator() {
require(msg.sender == permittedOperator || msg.sender == owner(), "Not a permitted operator");
_;
}
/// @notice Exchanges ETH for swapping points.
function exchangeETH() external payable nonReentrant whenNotPaused {
require(msg.value > 0, "Amount cannot be 0");
require(msg.value % exchange.rateEth == 0, "Invalid ETH amount");
uint256 pointsToReceive = msg.value / exchange.rateEth;
points[msg.sender] += pointsToReceive;
(bool sent, ) = receiver.call{value: msg.value}("");
require(sent, "Failed to send ETH");
emit PointsPurchase(msg.sender, Currency.ETH, msg.value, pointsToReceive, points[msg.sender]);
}
/// @notice Exchanges WETH for swapping points.
/// @param amount The amount of WETH to be exchanged.
function exchangeWETH(uint256 amount) external nonReentrant whenNotPaused {
require(amount > 0, "Amount cannot be 0");
require(amount % exchange.rateEth == 0, "Invalid WETH amount");
uint256 pointsToReceive = amount / exchange.rateEth;
points[msg.sender] += pointsToReceive;
WETH.safeTransferFrom(msg.sender, receiver, amount);
emit PointsPurchase(msg.sender, Currency.WETH, amount, pointsToReceive, points[msg.sender]);
}
/// @notice Exchanges APE coin for swapping points.
/// @param amount The amount of APE to be exchanged.
function exchangeAPE(uint256 amount) external nonReentrant whenNotPaused {
require(amount > 0, "Amount cannot be 0");
require(amount % exchange.rateApe == 0, "Invalid APE amount");
uint256 pointsToReceive = amount / exchange.rateApe;
points[msg.sender] += pointsToReceive;
APE.safeTransferFrom(msg.sender, receiver, amount);
emit PointsPurchase(msg.sender, Currency.APE, amount, pointsToReceive, points[msg.sender]);
}
/// @notice Exchanges RVM coins for points.
/// @param amount The amount of RVM coins to be exchanged.
function exchangeRVM(uint256 amount) external nonReentrant whenNotPaused {
require(amount > 0, "Amount cannot be 0");
require(amount % exchange.rateRvm == 0, "Invalid RVM amount");
uint256 pointsToReceive = amount / exchange.rateRvm;
points[msg.sender] += pointsToReceive;
RVM.burn(msg.sender, 0, amount);
emit PointsPurchase(msg.sender, Currency.RVM, amount, pointsToReceive, points[msg.sender]);
}
/// @notice Enables a user to create a WETH transfer.
/// @param transfer The details of the new WETH transfer.
function executeWETHOrder(Transfer memory transfer) external nonReentrant whenNotPaused {
require(transfer.buyer == msg.sender, "Buyer must create own order");
require(transfer.amount >= exchange.minOrder, "Transfer amount is below minimum");
require(validateAltsOwnership(transfer.buyerAlts, msg.sender), "Buyer: no valid ALT ID");
require(validateAltsOwnership(transfer.sellerAlts, transfer.seller), "Seller: no valid ALT ID");
unchecked {
uint256 minFee = exchange.minFee;
uint256 calculatedFee = (transfer.amount * exchange.fee) / 100;
uint256 feeAmount = calculatedFee < minFee ? minFee : calculatedFee;
totalTransfers++;
transfer.id = totalTransfers;
transfers[transfer.id] = transfer;
address buyer = transfer.buyer;
WETH.safeTransferFrom(buyer, receiver, feeAmount);
WETH.safeTransferFrom(buyer, transfer.seller, transfer.amount);
emit TransferWETH(transfer.id, transfer.buyer, transfer.seller, transfer.amount, feeAmount);
}
}
/// @notice Enables a user to create a new WETH offer.
/// @param order The details of the new WETH offer.
function createOrder(Order memory order) external nonReentrant whenNotPaused {
require(order.buyer == msg.sender, "Buyer must create their own order");
require(order.buyerAlt >= 1 && order.buyerAlt <= 30000, "Invalid buyer ALT ID");
require(order.sellerAlt >= 1 && order.sellerAlt <= 30000, "Invalid seller ALT ID");
require(order.amount >= exchange.minOrder, "Order amount is below minimum");
require(ALTS.ownerOf(order.buyerAlt) == msg.sender, "Buyer does not own the specified ALT");
require(ALTS.ownerOf(order.sellerAlt) == order.seller, "Seller does not own the specified ALT");
// No overflow in unchecked block as order.amount is uint96 and exchange.fee is max 100
unchecked {
uint256 minFee = exchange.minFee;
uint256 calculatedFee = (order.amount * exchange.fee) / 100;
uint256 feeAmount = calculatedFee < minFee ? minFee : calculatedFee;
require(
WETH.allowance(msg.sender, address(this)) >= order.amount + feeAmount,
"Insufficient WETH allowance"
);
totalOrders++;
}
order.id = totalOrders;
order.status = OrderStatus.PENDING;
order.expiresAt = uint32(block.timestamp + expiryPeriod);
orders[order.id] = order;
emit OrderCreated(order.id, order.buyer, order.seller, order.amount, order.expiresAt);
}
/// @notice Enables a user to cancel a WETH offer.
/// @param id The ID of the WETH offer to be canceled.
function cancelOrder(uint56 id) external nonReentrant whenNotPaused {
Order storage order = orders[id];
OrderStatus status = order.status;
require(status != OrderStatus.UNSET, "Order does not exist");
require(status == OrderStatus.PENDING, "Order is not pending");
address buyer = order.buyer;
require(
buyer == msg.sender || permittedOperator == msg.sender || owner() == msg.sender,
"Not the buyer of this order"
);
order.status = OrderStatus.CANCELED;
emit OrderCanceled(id, buyer, order.seller, order.amount);
}
/// @notice Fulfills a specific WETH offer.
/// @param id The ID of the WETH offer to be fulfilled.
function fulfillOrder(uint56 id) external onlyPermittedOperator {
Order storage order = orders[id];
require(order.status == OrderStatus.PENDING, "Order not eligible for fulfillment");
if (block.timestamp > order.expiresAt) {
revert("Expired");
}
unchecked {
uint256 orderAmount = order.amount;
uint256 feeAmount = (orderAmount * exchange.fee) / 100;
if (feeAmount < exchange.minFee) {
feeAmount = exchange.minFee;
}
// WETH calls in unchecked block scope vs separate declarations
address buyer = order.buyer;
WETH.safeTransferFrom(buyer, receiver, feeAmount);
WETH.safeTransferFrom(buyer, order.seller, orderAmount);
}
order.status = OrderStatus.ACCEPTED;
emit OrderFulfilled(id);
}
/// @notice Enables a user to send their points to another user.
/// @param to The address to receive the points.
/// @param amount The amount of points to send.
function transferPoints(address to, uint256 amount) external nonReentrant whenNotPaused {
require(pointsTransfers, "Transfers of points are disabled");
require(to != address(0), "Cannot send to zero address");
require(points[msg.sender] >= amount, "Insufficient points balance");
points[msg.sender] -= amount;
points[to] += amount;
emit TransferPoints(msg.sender, to, amount);
}
/// @notice Overwrite the current points balance for the given users.
/// @param users The list of user addresses.
/// @param balances The corresponding list of point balances for each user.
function setPoints(address[] calldata users, uint256[] calldata balances) external onlyPermittedOperator {
require(users.length == balances.length, "Mismatched arrays");
unchecked {
for (uint256 i = 0; i < users.length; i++) {
points[users[i]] = balances[i];
}
}
}
/// @notice Increments or decrements the current points balance for the given users by the given amount(s).
/// @param users The list of user addresses whose points should be incremented or decremented.
/// @param adjustments The corresponding list of point adjustments (positive for increments, negative for decrements) for each user.
function adjustPoints(address[] calldata users, int256[] calldata adjustments) external onlyPermittedOperator {
require(users.length == adjustments.length, "Mismatched arrays");
unchecked {
for (uint256 i = 0; i < users.length; i++) {
if (adjustments[i] > 0) {
points[users[i]] += uint256(adjustments[i]);
} else {
require(points[users[i]] >= uint256(-adjustments[i]), "Cannot decrease below zero");
points[users[i]] -= uint256(-adjustments[i]);
}
}
}
}
/// @notice Sets the wallet to receive exchange payments.
/// @param _receiver The new address of the receiver.
function setReceiver(address payable _receiver) external onlyOwner {
receiver = _receiver;
}
/// @notice Sets the period from order creation block timestamp after which orders should expire.
/// @param period The new expiry period in seconds (e.g. 14 days is 1209600).
function setExpiryPeriod(uint32 period) external onlyOwner {
expiryPeriod = period;
}
/// @notice Sets WETH fee and exchange rates for the supported currencies and tokens.
/// @param eth The exchange rate for ETH.
/// @param ape The exchange rate for APE coin.
/// @param rvm The exchange rate for RVM coin.
/// @param fee The fee applied to WETH offers.
function setExchange(
uint56 eth,
uint72 ape,
uint8 rvm,
uint8 fee,
uint56 minFee,
uint56 minOrder
) external onlyOwner {
exchange.rateApe = ape;
exchange.rateEth = eth;
exchange.minFee = fee;
exchange.minOrder = minOrder;
exchange.rateRvm = rvm;
exchange.fee = fee;
}
/// @notice Sets the permitted operator address.
/// @param _operator The address of the operator.
function setPermittedOperator(address _operator) external onlyOwner {
require(_operator != address(0), "Operator address cannot be null");
permittedOperator = _operator;
}
/// @notice Removes permissions from the permitted operator.
function removePermittedOperator() external onlyOwner {
permittedOperator = address(0);
}
/// @notice Fetches allowances for the user for all supported tokens.
/// @param user The address of the user.
function getAllowances(address user) external view returns (uint256[] memory) {
uint256[] memory allowances = new uint256[](3);
allowances[0] = WETH.allowance(user, address(this));
allowances[1] = APE.allowance(user, address(this));
allowances[2] = RVM.isApprovedForAll(user, address(this)) ? 1 : 0;
return allowances;
}
/// @notice Fetches orders including a specific wallet address between the given range.
/// @param user The address of the user.
/// @param start The starting ID of the order range.
/// @param end The ending ID of the order range.
/// @param isSeller Whether to fetch orders where the user is the buyer (WETH sender) or the seller (WETH receiver).
function getOrdersByUser(
address user,
uint56 start,
uint56 end,
bool isSeller
) external view returns (uint56[] memory) {
require(start <= end, "Invalid range");
uint56[] memory orderRange = new uint56[](end - start + 1);
uint256 count = 0;
unchecked {
for (uint56 i = start; i <= end; i++) {
bool isUserOrder = (isSeller && orders[i].seller == user) || (!isSeller && orders[i].buyer == user);
if (isUserOrder && orders[i].status != OrderStatus.UNSET) {
orderRange[count++] = i;
}
}
}
uint56[] memory result = new uint56[](count);
unchecked {
for (uint256 j = 0; j < count; j++) {
result[j] = orderRange[j];
}
}
return result;
}
/// @notice Gets informatiom about a WETH transfer
/// @param transferId The ID of the transfer to get data for
/// @dev Alternative to public transfers mapping to facilitate uint16[3] display
function getTransfer(
uint96 transferId
) public view returns (address, uint16[3] memory, uint16[3] memory, address, uint96, uint256) {
Transfer storage t = transfers[transferId];
return (t.buyer, t.buyerAlts, t.sellerAlts, t.seller, t.id, t.amount);
}
/// @notice Drains any Ether from the contract to the owner.
/// @dev This is an emergency function for funds release.
function drainETH() external onlyOwner {
owner().call{value: address(this).balance}("");
}
/// @notice Drains any WETH from the contract to the owner.
/// @dev This is an emergency function for funds release.
function drainWETH() external onlyOwner {
WETH.transfer(owner(), WETH.balanceOf(address(this)));
}
/// @notice Drains any APE tokens from the contract to the owner.
/// @dev This is an emergency function for funds release.
function drainAPE() external onlyOwner {
APE.transfer(owner(), APE.balanceOf(address(this)));
}
/// @notice Enables peer-to-peer points transfer.
function enableTransfers() external onlyOwner {
pointsTransfers = true;
}
/// @notice Disables peer-to-peer points transfer.
function disableTransfers() external onlyOwner {
pointsTransfers = false;
}
/// @notice Pauses exchanges and points issuance.
function pause() external onlyPermittedOperator {
_pause();
}
/// @notice Unpauses exchanges and points issuance.
function unpause() external onlyPermittedOperator {
_unpause();
}
/// @dev Issues swapping points for RVM coins send to the contract.
function onERC1155Received(
address operator,
address from,
uint256 id,
uint256 value,
bytes calldata data
) external override returns (bytes4) {
require(address(RVM) == msg.sender, "Only RVM tokens accepted");
require(id == 0, "Only RVM tokenId 0 accepted");
uint256 pointsToReceive = value / exchange.rateRvm;
points[from] += pointsToReceive;
emit PointsPurchase(from, Currency.RVM, value, pointsToReceive, points[from]);
RVM.burn(address(this), id, value);
return this.onERC1155Received.selector;
}
/// @dev Declines batch transfers of ERC1155 tokens to the contract.
function onERC1155BatchReceived(
address operator,
address from,
uint256[] calldata ids,
uint256[] calldata values,
bytes calldata data
) external override returns (bytes4) {
revert("Not supported");
}
/// @dev Supports IERC1155Receiver
function supportsInterface(bytes4 interfaceId) external pure override returns (bool) {
return interfaceId == type(IERC1155Receiver).interfaceId;
}
/// @notice Check a wallet owns the given ALTs
/// @param tokenIds The ALT tokenIds to check
/// @param owner The expected owner wallet address
function validateAltsOwnership(uint16[3] memory tokenIds, address owner) internal view returns (bool) {
bool validAlt = false;
for (uint i = 0; i < 3; i++) {
if (tokenIds[i] != 0) {
validAlt = true;
require(ALTS.ownerOf(tokenIds[i]) == owner, "ALT ownership mismatch");
}
}
return validAlt;
}
}