Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- stableQiVault
- Optimization enabled
- true
- Compiler version
- v0.8.11+commit.d7f03943
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2022-07-20T10:06:00.508652Z
Constructor Arguments
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
Arg [0] (address) : 0x983e54c2f5c8d83b73b80ddee2446dd616de0067
Arg [1] (uint256) : 150
Arg [2] (string) : Wrapped Kava MAI Vault
Arg [3] (string) : WKMVT
Arg [4] (address) : 0xb84df10966a5d7e1ab46d9276f55d57bd336afc7
Arg [5] (address) : 0xc86c7c0efbd6a49b35e8714c5f59d99de09a225b
Arg [6] (string) : Qme6NMZcQvowyQLTGRwVSDYeSUUAAD3GtiCDEcJqDHXxRf
Contract source code
// Sources flattened with hardhat v2.9.6 https://hardhat.org // File @openzeppelin/contracts/utils/Context.sol@v4.6.0 // 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; } } // File @openzeppelin/contracts/access/Ownable.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) pragma solidity ^0.8.0; /** * @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 Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing 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); } } // File @openzeppelin/contracts/token/ERC20/IERC20.sol@v4.6.0 // 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); } // File @openzeppelin/contracts/utils/Address.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.5.0) (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 * ==== * * [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://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); } } } } // File @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; /** * @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"); } } } // File @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; /** * @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); } // File @openzeppelin/contracts/token/ERC20/ERC20.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * 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}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * 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 value {ERC20} uses, unless this function is * 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 `sender` to `recipient`. * * 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; } _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; _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; } _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 {} } // File @openzeppelin/contracts/security/ReentrancyGuard.sol@v4.6.0 // 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; } } // File contracts/interfaces/IPriceSourceAll.sol pragma solidity 0.8.11; interface IPriceSource { function latestRoundData() external view returns (uint256); function latestAnswer() external view returns (uint256); function decimals() external view returns (uint8); } // File @openzeppelin/contracts/utils/introspection/IERC165.sol@v4.6.0 // 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); } // File @openzeppelin/contracts/token/ERC721/IERC721.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; /** * @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 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 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); } // File @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol) pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); } // File @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); } // File @openzeppelin/contracts/utils/Strings.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } } // File @openzeppelin/contracts/utils/introspection/ERC165.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } } // File @openzeppelin/contracts/token/ERC721/ERC721.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overridden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @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. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _afterTokenTransfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _afterTokenTransfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); _afterTokenTransfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits a {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` 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 tokenId ) 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. * - `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 tokenId ) internal virtual {} } // File @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol@v4.6.0 // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol) pragma solidity ^0.8.0; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); } // File @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol@v4.6.0 // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol) pragma solidity ^0.8.0; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } } // File contracts/token/MyVaultV4.sol // contracts/MyVaultNFT.sol pragma solidity 0.8.11; contract VaultNFTv4 is ERC721, ERC721Enumerable { string public uri; function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable) { super._beforeTokenTransfer(from, to, tokenId); } function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool) { return super.supportsInterface(interfaceId); } constructor(string memory name, string memory symbol, string memory _uri) ERC721(name, symbol) { uri = _uri; } function tokenURI(uint256 tokenId) public override view returns (string memory) { require(_exists(tokenId)); return uri; } } // File contracts/fixedInterestVaults/fixedVault.sol pragma solidity 0.8.11; contract fixedVault is ReentrancyGuard, VaultNFTv4 { using SafeERC20 for ERC20; /// @dev Constants used across the contract. uint256 constant TEN_THOUSAND = 10000; uint256 constant ONE_YEAR = 31556952; uint256 constant THOUSAND = 1000; IPriceSource public ethPriceSource; uint256 public _minimumCollateralPercentage; uint256 public vaultCount; uint256 public closingFee; uint256 public openingFee; uint256 public minDebt; uint256 public maxDebt; uint256 constant public tokenPeg = 1e8; // $1 uint256 public iR; mapping(uint256 => uint256) public vaultCollateral; mapping(uint256 => uint256) public accumulatedVaultDebt; mapping(uint256 => uint256) public lastInterest; mapping(uint256 => uint256) public promoter; uint256 public adminFee; // 10% of the earned interest uint256 public refFee; // 90% of the earned interest uint256 public debtRatio; uint256 public gainRatio; ERC20 public collateral; ERC20 public mai; uint256 public decimalDifferenceRaisedToTen; uint256 public priceSourceDecimals; uint256 public totalBorrowed; mapping(address => uint256) public maticDebt; uint256 public maiDebt; address public stabilityPool; address public adm; address public ref; address public router; uint8 public version = 7; event CreateVault(uint256 vaultID, address creator); event DestroyVault(uint256 vaultID); event DepositCollateral(uint256 vaultID, uint256 amount); event WithdrawCollateral(uint256 vaultID, uint256 amount); event BorrowToken(uint256 vaultID, uint256 amount); event PayBackToken(uint256 vaultID, uint256 amount, uint256 closingFee); event LiquidateVault( uint256 vaultID, address owner, address buyer, uint256 debtRepaid, uint256 collateralLiquidated, uint256 closingFee ); event BoughtRiskyDebtVault(uint256 riskyVault, uint256 newVault, address riskyVaultBuyer, uint256 amountPaidtoBuy); constructor( address ethPriceSourceAddress, uint256 minimumCollateralPercentage, string memory name, string memory symbol, address _mai, address _collateral, string memory baseURI ) VaultNFTv4(name, symbol, baseURI) { require(ethPriceSourceAddress != address(0)); require(minimumCollateralPercentage != 0); closingFee = 50; // 0.5% openingFee = 0; // 0.0% ethPriceSource = IPriceSource(ethPriceSourceAddress); stabilityPool = address(0); maxDebt = 500000 ether; //Keeping maxDebt at 500K * 10^(18) debtRatio = 2; // 1/2, pay back 50% gainRatio = 1100; // /10 so 1.1 _minimumCollateralPercentage = minimumCollateralPercentage; collateral = ERC20(_collateral); mai = ERC20(_mai); priceSourceDecimals = 8; /* This works only for collaterals with decimals < 18 */ decimalDifferenceRaisedToTen = 10**(mai.decimals() - collateral.decimals()); adm = msg.sender; ref = msg.sender; } modifier onlyVaultOwner(uint256 vaultID) { require(_exists(vaultID), "Vault does not exist"); require(ownerOf(vaultID) == msg.sender, "Vault is not owned by you"); _; } modifier onlyRouter() { require( router == address(0) || msg.sender == router, "must use router" ); _; } modifier vaultExists(uint256 vaultID) { require(_exists(vaultID), "Vault does not exist"); _; } modifier frontExists(uint256 vaultID) { require(_exists(vaultID), "front end vault does not exist"); require(promoter[vaultID] <= TEN_THOUSAND && promoter[vaultID] > 0, "Front end not added"); _; } /// @notice Return the current debt available to borrow. /// @dev checks the outstanding balance of the borrowable asset within the contract. /// @return available balance of borrowable asset. function getDebtCeiling() public view returns (uint256) { return mai.balanceOf(address(this)); } /// @param vaultID is the token id of the vault being checked. /// @notice Returns true if a vault exists /// @dev the erc721 spec allows users to burn/destroy their nft /// @return boolean if the vault exists function exists(uint256 vaultID) external view returns (bool) { return _exists(vaultID); } /// @notice Returns the total value locked in the vault, based on the oracle price. /// @return uint256 total value locked in vault function getTotalValueLocked() external view returns (uint256) { return ( getEthPriceSource() * decimalDifferenceRaisedToTen * collateral.balanceOf(address(this)) ) ; //extra 1e8, to get fraction in ui // 1e8 * 1eDelta } /// @notice Return the fee charged when repaying a vault. /// @return uint256 is the fee charged to a vault when repaying. function getClosingFee() external view returns (uint256) { return closingFee; } /// @notice Return the peg maintained by the vault. /// @return uint256 is the value with 8 decimals used to calculate borrowable debt. function getTokenPriceSource() public view returns (uint256) { return tokenPeg; } /// @notice Return the collateral value /// @return uint256 is the value retrieved from the oracle used /// to calculate the available borrowable amounts. function getEthPriceSource() public view returns (uint256) { return ethPriceSource.latestAnswer(); } /// @param vaultID is the token id of the vault being checked. /// @notice Returns the debt owned by the vault and the interest accrued over time. /// @return uint256 fee earned in the time between updates /// @return uint256 debt owed by the vault for further calculation. function _vaultDebtAndFee(uint256 vaultID) internal view returns (uint256, uint256) { uint256 currentTime = block.timestamp; uint256 debt = accumulatedVaultDebt[vaultID]; uint256 fee = 0; if (lastInterest[vaultID] != 0 && iR > 0) { uint256 timeDelta = currentTime - lastInterest[vaultID]; uint256 feeAccrued = (((iR * debt) * timeDelta) / ONE_YEAR) / TEN_THOUSAND; fee = feeAccrued; debt = feeAccrued + debt; } return (fee, debt); } /// @param vaultID is the token id of the vault being checked. /// @notice Returns the debt owned by the vault without tracking the interest /// @return uint256 debt owed by the vault for further calculation. function vaultDebt(uint256 vaultID) public view returns (uint256) { (, uint256 debt) = _vaultDebtAndFee(vaultID); return debt; } /// @param vaultID is the token id of the vault being checked. /// @notice Adds the interest charged to the vault over the previous time called. /// @return uint256 latest vault debt function updateVaultDebt(uint256 vaultID) public returns (uint256) { (uint256 fee, uint256 debt) = _vaultDebtAndFee(vaultID); maiDebt = maiDebt + fee; totalBorrowed = totalBorrowed + fee; if(iR > 0) { lastInterest[vaultID] = block.timestamp; } // we can just update the current vault debt here instead accumulatedVaultDebt[vaultID] = debt; return debt; } /// @param _collateral is the amount of collateral tokens to be valued. /// @param _debt is the debt owed by the vault. /// @notice Returns collateral value and debt based on the oracle prices /// @return uint256 coolateral value * 100. used to calculate the CDR /// @return uint256 debt value. Uses token price source to derive. function calculateCollateralProperties(uint256 _collateral, uint256 _debt) private view returns (uint256, uint256) { require(getEthPriceSource() != 0); require(getTokenPriceSource() != 0); uint256 collateralValue = _collateral * getEthPriceSource() * decimalDifferenceRaisedToTen; require(collateralValue >= _collateral); uint256 debtValue = _debt * getTokenPriceSource(); require(debtValue >= _debt); uint256 collateralValueTimes100 = collateralValue * 100; require(collateralValueTimes100 > collateralValue); return (collateralValueTimes100, debtValue); } /// @param _collateral is the amount of collateral tokens held by vault. /// @param debt is the debt owed by the vault. /// @notice Calculates if the CDR is valid before taking a further action with a user /// @return boolean describing if the new CDR is valid. function isValidCollateral(uint256 _collateral, uint256 debt) public view returns (bool) { ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties(_collateral, debt); uint256 collateralPercentage = collateralValueTimes100 / debtValue; return collateralPercentage >= _minimumCollateralPercentage; } /// @param fee is the amount of basis points (BP) to charge /// @param amount is the total value to calculate the BPs from /// @param promoFee is the fee charged by the front end /// @notice Returns fee to charge based on the collateral amount /// @return uint256 fee to charge the collateral. /// @dev fee can be called on web app to compare charges. function calculateFee( uint256 fee, uint256 amount, uint256 promoFee ) public view returns (uint256) { uint256 _fee; if (promoFee>0) { _fee = ((amount * fee * getTokenPriceSource() * promoFee) / (getEthPriceSource() * TEN_THOUSAND * TEN_THOUSAND)); } else { _fee = (amount * fee * getTokenPriceSource()) / (getEthPriceSource() * TEN_THOUSAND); } return _fee / decimalDifferenceRaisedToTen; } /// @notice Creates a new ERC721 Vault NFT /// @return uint256 the token id of the vault created. function createVault() public returns (uint256) { uint256 id = vaultCount; vaultCount = vaultCount + 1; require(vaultCount >= id); _mint(msg.sender, id); emit CreateVault(id, msg.sender); return id; } /// @notice Destroys an ERC721 Vault NFT /// @param vaultID the vault ID to destroy /// @dev vault must not have any debt owed to be able to be destroyed. function destroyVault(uint256 vaultID) external onlyVaultOwner(vaultID) nonReentrant { require(vaultDebt(vaultID) == 0, "Vault has outstanding debt"); if (vaultCollateral[vaultID] != 0) { // withdraw leftover collateral collateral.safeTransfer(ownerOf(vaultID), vaultCollateral[vaultID]); } _burn(vaultID); delete vaultCollateral[vaultID]; delete accumulatedVaultDebt[vaultID]; delete lastInterest[vaultID]; emit DestroyVault(vaultID); } /// @param vaultID is the token id of the vault being interacted with. /// @param amount is the amount of collateral to deposit from msg.sender /// @notice Adds collateral to a specific vault by token id /// @dev Any address can deposit into a vault function depositCollateral(uint256 vaultID, uint256 amount) external vaultExists(vaultID) onlyRouter { uint256 newCollateral = vaultCollateral[vaultID] + (amount); require(newCollateral >= vaultCollateral[vaultID]); vaultCollateral[vaultID] = newCollateral; collateral.safeTransferFrom(msg.sender, address(this), amount); emit DepositCollateral(vaultID, amount); } /// @param vaultID is the token id of the vault being interacted with. /// @param amount is the amount of collateral to withdraw /// @notice withdraws collateral to a specific vault by token id /// @dev If there is debt, then it can only withdraw up to the min CDR. function withdrawCollateral(uint256 vaultID, uint256 amount) external onlyVaultOwner(vaultID) nonReentrant { require( vaultCollateral[vaultID] >= amount, "Vault does not have enough collateral" ); uint256 newCollateral = vaultCollateral[vaultID] - amount; uint256 debt = updateVaultDebt(vaultID); if (debt != 0) { require( isValidCollateral(newCollateral, debt), "Withdrawal would put vault below minimum collateral percentage" ); } vaultCollateral[vaultID] = newCollateral; collateral.safeTransfer(msg.sender, amount); emit WithdrawCollateral(vaultID, amount); } /// @param vaultID is the token id of the vault being interacted with. /// @param amount is the amount of borrowable asset to borrow /// @notice borrows asset based on the collateral held and the price of the collateral. /// @dev Borrowing is limited by the CDR of the vault /// If there's opening fee, it will be charged here. function borrowToken( uint256 vaultID, uint256 amount, uint256 _front ) external frontExists(_front) onlyVaultOwner(vaultID) nonReentrant { require(amount > 0, "Must borrow non-zero amount"); require( amount <= getDebtCeiling(), "borrowToken: Cannot mint over available supply." ); uint256 newDebt = updateVaultDebt(vaultID) + amount; require(newDebt<=maxDebt, "borrowToken: max loan cap reached."); require(newDebt > vaultDebt(vaultID)); require( isValidCollateral(vaultCollateral[vaultID], newDebt), "Borrow would put vault below minimum collateral percentage" ); require( ((vaultDebt(vaultID)) + amount) >= minDebt, "Vault debt can't be under minDebt" ); accumulatedVaultDebt[vaultID] = newDebt; uint256 _openingFee = calculateFee(openingFee, newDebt, promoter[_front]); vaultCollateral[vaultID] = vaultCollateral[vaultID] - (_openingFee); vaultCollateral[_front] = vaultCollateral[_front] + (_openingFee); // mai mai.safeTransfer(msg.sender, amount); totalBorrowed = totalBorrowed + (amount); emit BorrowToken(vaultID, amount); } function paybackTokenAll( uint256 vaultID, uint256 deadline, uint256 _front ) external frontExists(_front) vaultExists(vaultID) onlyRouter { require( deadline >= block.timestamp, "paybackTokenAll: deadline expired." ); uint256 _amount = updateVaultDebt(vaultID); payBackToken(vaultID, _amount, _front); } /// @param vaultID is the token id of the vault being interacted with. /// @param amount is the amount of borrowable asset to repay /// @param _front is the front end that will get the opening /// @notice payback asset to close loan. /// @dev If there is debt, then it can only withdraw up to the min CDR. function payBackToken( uint256 vaultID, uint256 amount, uint256 _front ) public frontExists(_front) vaultExists(vaultID) onlyRouter { require(mai.balanceOf(msg.sender) >= amount, "Token balance too low"); uint256 vaultDebtNow = updateVaultDebt(vaultID); require( vaultDebtNow >= amount, "Vault debt less than amount to pay back" ); require( ((vaultDebtNow) - amount) >= minDebt || amount == (vaultDebtNow), "Vault debt can't be under minDebt" ); uint256 _closingFee = calculateFee( closingFee, amount, promoter[_front] ); accumulatedVaultDebt[vaultID] = vaultDebtNow - amount; vaultCollateral[vaultID] = vaultCollateral[vaultID] - _closingFee; vaultCollateral[_front] = vaultCollateral[_front] + _closingFee; totalBorrowed = totalBorrowed - amount; //mai mai.safeTransferFrom(msg.sender, address(this), amount); emit PayBackToken(vaultID, amount, _closingFee); } /// @notice withdraws liquidator earnings. /// @dev reverts if there's no collateral to withdraw. function getPaid() external nonReentrant { require(maticDebt[msg.sender] != 0, "Don't have anything for you."); uint256 amount = maticDebt[msg.sender]; maticDebt[msg.sender] = 0; collateral.safeTransfer(msg.sender, amount); } /// @param pay is address of the person to getPaid /// @notice withdraws liquidator earnings. /// @dev reverts if there's no collateral to withdraw. function getPaid(address pay) external nonReentrant { require(maticDebt[pay] != 0, "Don't have anything for you."); uint256 amount = maticDebt[pay]; maticDebt[pay] = 0; collateral.safeTransfer(pay, amount); } /// @param vaultID is the token id of the vault being interacted with. /// @notice Calculates cost to liquidate a vault /// @dev Can be used to calculate balance required to liquidate a vault. function checkCost(uint256 vaultID) public view returns (uint256) { uint256 vaultDebtNow = vaultDebt(vaultID); if ( vaultCollateral[vaultID] == 0 || vaultDebtNow == 0 || !checkLiquidation(vaultID) ) { return 0; } (, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); if (debtValue == 0) { return 0; } debtValue = debtValue / (10**priceSourceDecimals); uint256 halfDebt = debtValue / debtRatio; //debtRatio (2) if (halfDebt <= minDebt) { halfDebt = debtValue; } return (halfDebt); } /// @param vaultID is the token id of the vault being interacted with. /// @notice Calculates collateral to extract when liquidating a vault /// @dev Can be used to calculate earnings from liquidating a vault. function checkExtract(uint256 vaultID) public view returns (uint256) { if (vaultCollateral[vaultID] == 0 || !checkLiquidation(vaultID)) { return 0; } uint256 vaultDebtNow = vaultDebt(vaultID); (, uint256 debtValue) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); uint256 halfDebt = debtValue / debtRatio; //debtRatio (2) if (halfDebt == 0) { return 0; } if ((halfDebt) / (10**priceSourceDecimals) <= minDebt) { // full liquidation if under the min debt. return (debtValue * ( gainRatio)) / (THOUSAND) / (getEthPriceSource()) / decimalDifferenceRaisedToTen; } else { return (halfDebt * (gainRatio)) / THOUSAND / (getEthPriceSource()) / decimalDifferenceRaisedToTen; } } /// @param vaultID is the token id of the vault being interacted with. /// @notice Calculates the collateral percentage of a vault. function checkCollateralPercentage(uint256 vaultID) public view vaultExists(vaultID) returns (uint256) { uint256 vaultDebtNow = vaultDebt(vaultID); if (vaultCollateral[vaultID] == 0 || vaultDebtNow == 0) { return 0; } ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); return collateralValueTimes100 / (debtValue); } /// @param vaultID is the token id of the vault being interacted with. /// @notice Calculates if a vault is liquidatable. /// @return bool if vault is liquidatable or not. function checkLiquidation(uint256 vaultID) public view vaultExists(vaultID) returns (bool) { uint256 vaultDebtNow = vaultDebt(vaultID); if (vaultCollateral[vaultID] == 0 || vaultDebtNow == 0) { return false; } ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); uint256 collateralPercentage = collateralValueTimes100 / (debtValue); if (collateralPercentage < _minimumCollateralPercentage) { return true; } else { return false; } } /// @param vaultID is the token id of the vault being interacted with. /// @notice Calculates if a vault is risky and can be bought. /// @return bool if vault is risky or not. function checkRiskyVault(uint256 vaultID) public view vaultExists(vaultID) returns (bool) { uint256 vaultDebtNow = vaultDebt(vaultID); if (vaultCollateral[vaultID] == 0 || vaultDebtNow == 0) { return false; } ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); uint256 collateralPercentage = collateralValueTimes100 / (debtValue); if ((collateralPercentage*10) <= gainRatio) { return true; } else { return false; } } /// @param vaultID is the token id of the vault being interacted with. /// @notice Pays back the part of the debt owed by the vault and removes a /// comparable amount of collateral plus bonus /// @dev if vault CDR is under the bonus ratio, /// then it will only be able to be bought through buy risky. /// Amount to pay back is based on debtRatio variable. function liquidateVault(uint256 vaultID, uint256 _front) external frontExists(_front) vaultExists(vaultID) { require( stabilityPool == address(0) || msg.sender == stabilityPool, "liquidation is disabled for public" ); uint256 vaultDebtNow = updateVaultDebt(vaultID); ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); require(vaultDebtNow != 0, "Vault debt is 0"); uint256 collateralPercentage = collateralValueTimes100 / (debtValue); require( collateralPercentage < _minimumCollateralPercentage, "Vault is not below minimum collateral percentage" ); require(collateralPercentage * 10 > gainRatio , "Vault is not above gain ratio"); debtValue = debtValue / (10**priceSourceDecimals); uint256 halfDebt = debtValue / (debtRatio); //debtRatio (2) if (halfDebt <= minDebt) { halfDebt = debtValue; } require( mai.balanceOf(msg.sender) >= halfDebt, "Token balance too low to pay off outstanding debt" ); totalBorrowed = totalBorrowed - (halfDebt); uint256 maticExtract = checkExtract(vaultID); accumulatedVaultDebt[vaultID] = vaultDebtNow - (halfDebt); // we paid back half of its debt. uint256 _closingFee = calculateFee(closingFee, halfDebt, promoter[_front]); vaultCollateral[vaultID] = vaultCollateral[vaultID] - (_closingFee); vaultCollateral[_front] = vaultCollateral[_front] + (_closingFee); // deduct the amount from the vault's collateral vaultCollateral[vaultID] = vaultCollateral[vaultID] - (maticExtract); // let liquidator take the collateral maticDebt[msg.sender] = maticDebt[msg.sender] + (maticExtract); //mai mai.safeTransferFrom(msg.sender, address(this), halfDebt); emit LiquidateVault( vaultID, ownerOf(vaultID), msg.sender, halfDebt, maticExtract, _closingFee ); } /// @param vaultID is the token id of the vault being interacted with. /// @notice Pays back the debt owed to bring it back to min CDR. /// And transfers ownership of it to the liquidator with a new vault /// @return uint256 new vault created with the debt and collateral. /// @dev this function can only be called if vault CDR is under the bonus ratio. /// address who calls it will now own the debt and the collateral. function buyRiskDebtVault(uint256 vaultID) external vaultExists(vaultID) returns(uint256) { require( stabilityPool == address(0) || msg.sender == stabilityPool, "buy risky is disabled for public" ); uint256 vaultDebtNow = updateVaultDebt(vaultID); require(vaultDebtNow != 0, "Vault debt is 0"); ( uint256 collateralValueTimes100, uint256 debtValue ) = calculateCollateralProperties( vaultCollateral[vaultID], vaultDebtNow ); uint256 collateralPercentage = collateralValueTimes100 / (debtValue); require( (collateralPercentage*10) <= gainRatio, "Vault is not below risky collateral percentage" ); uint256 maiDebtTobePaid = (debtValue / (10**priceSourceDecimals)) - (collateralValueTimes100 / ( _minimumCollateralPercentage * (10**priceSourceDecimals))); //have enough MAI to bring vault to X CDR (presumably min) require(mai.balanceOf(msg.sender) >= maiDebtTobePaid, "Not enough mai to buy the risky vault"); //mai mai.safeTransferFrom(msg.sender, address(this), maiDebtTobePaid); totalBorrowed = totalBorrowed - (maiDebtTobePaid); // newVault for msg.sender uint256 newVault = createVault(); // updating vault collateral and debt details for the transfer of risky vault vaultCollateral[newVault] = vaultCollateral[vaultID]; accumulatedVaultDebt[newVault] = vaultDebtNow - maiDebtTobePaid; lastInterest[newVault] = block.timestamp; // resetting the vaultID vault info delete vaultCollateral[vaultID]; delete accumulatedVaultDebt[vaultID]; // lastInterest of vaultID would be block.timestamp, not reseting its timestamp emit BoughtRiskyDebtVault(vaultID, newVault, msg.sender, maiDebtTobePaid); return newVault; } } // File contracts/fixedInterestVaults/fixedQiVault.sol pragma solidity 0.8.11; /// @title Fixed Interest Vault /// @notice Single collateral lending manager with fixed rate interest. contract stableQiVault is fixedVault, Ownable { /// @dev Used to restrain the fee. Can only be up to 5% of the amount. uint256 constant FEE_MAX = 500; string private oracleType; constructor( address ethPriceSourceAddress, uint256 minimumCollateralPercentage, string memory name, string memory symbol, address _mai, address _collateral, string memory baseURI ) fixedVault( ethPriceSourceAddress, minimumCollateralPercentage, name, symbol, _mai, _collateral, baseURI ) { createVault(); addFrontEnd(0); } event UpdatedClosingFee(uint256 newFee); event UpdatedOpeningFee(uint256 newFee); event WithdrawInterest(uint256 earned); event UpdatedMinDebt(uint256 newMinDebt); event UpdatedMaxDebt(uint256 newMaxDebt); event UpdatedDebtRatio(uint256 _debtRatio); event UpdatedGainRatio(uint256 _gainRatio); event UpdatedEthPriceSource(address _ethPriceSourceAddress); event AddedFrontEnd(uint256 promoter); event RemovedFrontEnd(uint256 promoter); event UpdatedFrontEnd(uint256 promoter, uint256 newFee); event UpdatedFees(uint256 _adminFee, uint256 _refFee); event UpdatedMinCollateralRatio(uint256 newMinCollateralRatio); event UpdatedStabilityPool(address pool); event UpdatedInterestRate(uint256 interestRate); event BurnedToken(uint256 amount); event UpdatedTokenURI(string uri); event UpdatedAdmin(address newAdmin); event UpdatedRef(address newRef); event UpdatedOracleName(string oracle); modifier onlyOperators() { require(ref == msg.sender || adm == msg.sender || owner() == msg.sender, "Needs to be called by operators"); _; } modifier onlyAdmin() { require(adm == msg.sender, "Needs to be called by admin"); _; } /// @param _oracle name of the oracle used by the contract /// @notice sets the oracle name used by the contract. for visual purposes. function updateOracleName(string memory _oracle) external onlyOwner { oracleType = _oracle; emit UpdatedOracleName(_oracle); } /// @param _gainRatio sets the bonus earned from a liquidator /// @notice implements a setter for the bonus earned by a liquidator /// @dev fails if the bonus is less than 1 function setGainRatio(uint256 _gainRatio) external onlyOwner { require(_gainRatio >= 1000, "gainRatio cannot be less than or equal to 1000"); gainRatio = _gainRatio; emit UpdatedGainRatio(gainRatio); } /// @param _debtRatio sets the ratio of debt paid back by a liquidator /// @notice sets the ratio of the debt to be paid back /// @dev it divides the debt. 1/debtRatio. function setDebtRatio(uint256 _debtRatio) external onlyOwner { require(debtRatio != 0, "Debt Ratio cannot be 0"); debtRatio = _debtRatio; emit UpdatedDebtRatio(debtRatio); } /// @param ethPriceSourceAddress is the address that provides the price of the collateral /// @notice sets the address used as oracle /// @dev Oracle price feed is used in here. Interface's available in the at /interfaces/IPriceSourceAll.sol function changeEthPriceSource(address ethPriceSourceAddress) external onlyOwner { require(ethPriceSourceAddress != address(0), "Ethpricesource cannot be zero address" ); ethPriceSource = IPriceSource(ethPriceSourceAddress); emit UpdatedEthPriceSource(ethPriceSourceAddress); } /// @param _pool is the address that can execute liquidations /// @notice sets the address used as stability pool for liquidations /// @dev if not set to address(0) then _pool is the only address able to liquidate function setStabilityPool(address _pool) external onlyOwner { require(_pool != address(0), "StabilityPool cannot be zero address" ); stabilityPool = _pool; emit UpdatedStabilityPool(stabilityPool); } /// @param _admin is the ratio earned by the address that maintains the market /// @param _ref is the ratio earned by the address that provides the borrowable asset /// @notice sets the interest rate split between the admin and ref /// @dev if not set to address(0) then _pool is the only address able to liquidate function setFees(uint256 _admin, uint256 _ref) external onlyOwner { require((_admin+_ref)==TEN_THOUSAND, "setFees: must equal 10000."); adminFee=_admin; refFee=_ref; emit UpdatedFees(adminFee, refFee); } /// @param minimumCollateralPercentage is the CDR that limits the amount borrowed /// @notice sets the CDR /// @dev only callable by owner of the contract function setMinCollateralRatio(uint256 minimumCollateralPercentage) external onlyOwner { _minimumCollateralPercentage = minimumCollateralPercentage; emit UpdatedMinCollateralRatio(_minimumCollateralPercentage); } /// @param _minDebt is minimum debt able to be borrowed by a vault. /// @notice sets the minimum debt. /// @dev dust protection function setMinDebt(uint256 _minDebt) external onlyOwner { require(_minDebt >=0, "setMinDebt: must be over 0."); minDebt = _minDebt; emit UpdatedMinDebt(minDebt); } /// @param _maxDebt is maximum debt able to be borrowed by a vault. /// @notice sets the maximum debt. /// @dev whale and liquidity protection. function setMaxDebt(uint256 _maxDebt) external onlyOwner { require(_maxDebt >=0, "setMaxDebt: must be over 0."); maxDebt = _maxDebt; emit UpdatedMaxDebt(maxDebt); } /// @param _ref is the address that provides the borrowable asset /// @notice sets the address that earns interest for providing a borrowable asset /// @dev cannot be address(0) function setRef(address _ref) external onlyOwner { require(_ref != address(0), "Reference Address cannot be zero"); ref = _ref; emit UpdatedRef(ref); } /// @param _adm is the ratio earned by the address that maintains the market /// @notice sets the address that earns interest for maintaining the market /// @dev cannot be address(0) function setAdmin(address _adm) external onlyOwner { require(_adm != address(0), "Admin Address cannot be zero"); adm = _adm; emit UpdatedAdmin(adm); } /// @param _openingFee is the fee charged to a vault when borrowing. /// @notice sets opening fee. /// @dev can only be up to 5% (FEE_MAX) of the amount. function setOpeningFee(uint256 _openingFee) external onlyOwner { require(_openingFee >= 0 && _openingFee <= FEE_MAX, "setOpeningFee: cannot be more than 5%"); openingFee = _openingFee; // emit event emit UpdatedOpeningFee(openingFee); } /// @param _closingFee is the fee charged to a vault when repaying. /// @notice sets closing fee. /// @dev can only be up to 5% (FEE_MAX) of the amount. function setClosingFee(uint256 _closingFee) external onlyOwner { require(_closingFee >= 0 && _closingFee <= FEE_MAX, "setClosingFee: cannot be more than 5%"); closingFee = _closingFee; // emit event emit UpdatedClosingFee(closingFee); } /// @param _promoter is a front end for the contract /// @notice adds a front end to earn opening/closing fees from borrowing/repaying. /// @dev can only be up to 5% (FEE_MAX) of the amount. function addFrontEnd(uint256 _promoter) public onlyOwner { require(_exists(_promoter), "addFrontEnd: Vault does not exist"); require(promoter[_promoter] == 0, "addFrontEnd: already added"); promoter[_promoter] = TEN_THOUSAND; emit AddedFrontEnd(_promoter); } /// @param _promoter is a front end for the contract /// @param cashback is the amount of fee not taken from a user. /// @notice updates the cashback variable for a given front end /// @dev can only be updated by the front end vault's owner function updateFrontEnd(uint256 _promoter, uint256 cashback) external frontExists(_promoter) onlyVaultOwner(_promoter) { require(cashback > 0 && cashback <= TEN_THOUSAND, "updateFrontEnd: cannot be 0"); promoter[_promoter] = cashback; emit UpdatedFrontEnd(_promoter, cashback); } /// @param _promoter is a front end for the contract /// @notice removes the ability for a front end to earn fees function removeFrontEnd(uint256 _promoter) external frontExists(_promoter) onlyOwner { require(_exists(_promoter), "removeFrontEnd: Vault does not exist"); require(promoter[_promoter] > 0, "removeFrontEnd: not a front end"); promoter[_promoter] = 0; emit RemovedFrontEnd(_promoter); } /// @notice withdraws earned interest by vault. function withdrawInterest() external onlyOperators nonReentrant { uint256 adm_fee = maiDebt*adminFee / TEN_THOUSAND; // Transfer mai.transfer(ref, (maiDebt-adm_fee) ); // cheaper and equivalent. mai.transfer(adm, adm_fee); emit WithdrawInterest(maiDebt); maiDebt = 0; } /// @param _iR is the fixed interest charged by a vault /// @notice sets the interest charged by a vault. function setInterestRate(uint256 _iR) external onlyOwner { iR = _iR; emit UpdatedInterestRate(iR); } /// @param amountToken is the amount of borrowable asset that is removed from the debt ceiling. /// @notice removes debt ceiling from the vault. /// @dev returns the asset to the owner so it can be redeployed at a later time. function burn(uint256 amountToken) external onlyAdmin { // Burn require(amountToken < mai.balanceOf(address(this)), "burn: Balance not enough"); mai.transfer(ref, amountToken); emit BurnedToken(amountToken); } /// @param _uri is the url for the nft metadata /// @notice updates the metadata /// @dev it currently uses an ipfs json function setTokenURI(string calldata _uri) external onlyOwner { uri = _uri; emit UpdatedTokenURI(uri); } function setRouter(address _router) external onlyOwner { router=_router; } }
Contract ABI
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Contract Creation Code
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