Contract Name:
stableQiVault
Contract Source Code:
File 1 of 1 : stableQiVault
// Sources flattened with hardhat v2.9.6 https://hardhat.org
// File @openzeppelin/contracts/utils/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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/[email protected]
// 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;
}
}