// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
pragma solidity ^0.8.0;
/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// 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);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

pragma solidity ^0.4.24;

// File: zos-lib/contracts/upgradeability/Proxy.sol

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  function () payable external {
    _fallback();
  }

  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal view returns (address);

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize)

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize)

      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize) }
      default { return(0, returndatasize) }
    }
  }

  /**
   * @dev Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal {
  }

  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}

// File: openzeppelin-solidity/contracts/AddressUtils.sol

/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether the target address is a contract
   * @dev This function will return false if invoked during the constructor of a contract,
   * as the code is not actually created until after the constructor finishes.
   * @param addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address addr) internal view returns (bool) {
    uint256 size;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603
    // for more details about how this works.
    // TODO Check this again before the Serenity release, because all addresses will be
    // contracts then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(addr) }
    return size > 0;
  }

}

// File: zos-lib/contracts/upgradeability/UpgradeabilityProxy.sol

/**
 * @title UpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address implementation);

  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
   * validated in the constructor.
   */
  bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;

  /**
   * @dev Contract constructor.
   * @param _implementation Address of the initial implementation.
   */
  constructor(address _implementation) public {
    assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));

    _setImplementation(_implementation);
  }

  /**
   * @dev Returns the current implementation.
   * @return Address of the current implementation
   */
  function _implementation() internal view returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      impl := sload(slot)
    }
  }

  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) private {
    require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

    bytes32 slot = IMPLEMENTATION_SLOT;

    assembly {
      sstore(slot, newImplementation)
    }
  }
}

// File: zos-lib/contracts/upgradeability/AdminUpgradeabilityProxy.sol

/**
 * @title AdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
   * validated in the constructor.
   */
  bytes32 private constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;

  /**
   * @dev Modifier to check whether the `msg.sender` is the admin.
   * If it is, it will run the function. Otherwise, it will delegate the call
   * to the implementation.
   */
  modifier ifAdmin() {
    if (msg.sender == _admin()) {
      _;
    } else {
      _fallback();
    }
  }

  /**
   * Contract constructor.
   * It sets the `msg.sender` as the proxy administrator.
   * @param _implementation address of the initial implementation.
   */
  constructor(address _implementation) UpgradeabilityProxy(_implementation) public {
    assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));

    _setAdmin(msg.sender);
  }

  /**
   * @return The address of the proxy admin.
   */
  function admin() external view ifAdmin returns (address) {
    return _admin();
  }

  /**
   * @return The address of the implementation.
   */
  function implementation() external view ifAdmin returns (address) {
    return _implementation();
  }

  /**
   * @dev Changes the admin of the proxy.
   * Only the current admin can call this function.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeAdmin(address newAdmin) external ifAdmin {
    require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
    emit AdminChanged(_admin(), newAdmin);
    _setAdmin(newAdmin);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be
   * called, as described in
   * https://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin {
    _upgradeTo(newImplementation);
    require(address(this).call.value(msg.value)(data));
  }

  /**
   * @return The admin slot.
   */
  function _admin() internal view returns (address adm) {
    bytes32 slot = ADMIN_SLOT;
    assembly {
      adm := sload(slot)
    }
  }

  /**
   * @dev Sets the address of the proxy admin.
   * @param newAdmin Address of the new proxy admin.
   */
  function _setAdmin(address newAdmin) internal {
    bytes32 slot = ADMIN_SLOT;

    assembly {
      sstore(slot, newAdmin)
    }
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal {
    require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
    super._willFallback();
  }
}

// File: contracts/FiatTokenProxy.sol

/**
* Copyright CENTRE SECZ 2018
*
* Permission is hereby granted, free of charge, to any person obtaining a copy 
* of this software and associated documentation files (the "Software"), to deal 
* in the Software without restriction, including without limitation the rights 
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
* copies of the Software, and to permit persons to whom the Software is furnished to 
* do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all 
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

pragma solidity ^0.4.24;


/**
 * @title FiatTokenProxy
 * @dev This contract proxies FiatToken calls and enables FiatToken upgrades
*/ 
contract FiatTokenProxy is AdminUpgradeabilityProxy {
    constructor(address _implementation) public AdminUpgradeabilityProxy(_implementation) {
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
import "./CometMainInterface.sol";
import "./ERC20.sol";
import "./vendor/@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
/**
 * @title Compound's Comet Contract
 * @notice An efficient monolithic money market protocol
 * @author Compound
 */
contract Comet is CometMainInterface {
    /** General configuration constants **/
    /// @notice The admin of the protocol
    address public override immutable governor;
    /// @notice The account which may trigger pauses
    address public override immutable pauseGuardian;
    /// @notice The address of the base token contract
    address public override immutable baseToken;
    /// @notice The address of the price feed for the base token
    address public override immutable baseTokenPriceFeed;
    /// @notice The address of the extension contract delegate
    address public override immutable extensionDelegate;
    /// @notice The point in the supply rates separating the low interest rate slope and the high interest rate slope (factor)
    /// @dev uint64
    uint public override immutable supplyKink;
    /// @notice Per second supply interest rate slope applied when utilization is below kink (factor)
    /// @dev uint64
    uint public override immutable supplyPerSecondInterestRateSlopeLow;
    /// @notice Per second supply interest rate slope applied when utilization is above kink (factor)
    /// @dev uint64
    uint public override immutable supplyPerSecondInterestRateSlopeHigh;
    /// @notice Per second supply base interest rate (factor)
    /// @dev uint64
    uint public override immutable supplyPerSecondInterestRateBase;
    /// @notice The point in the borrow rate separating the low interest rate slope and the high interest rate slope (factor)
    /// @dev uint64
    uint public override immutable borrowKink;
    /// @notice Per second borrow interest rate slope applied when utilization is below kink (factor)
    /// @dev uint64
    uint public override immutable borrowPerSecondInterestRateSlopeLow;
    /// @notice Per second borrow interest rate slope applied when utilization is above kink (factor)
    /// @dev uint64
    uint public override immutable borrowPerSecondInterestRateSlopeHigh;
    /// @notice Per second borrow base interest rate (factor)
    /// @dev uint64
    uint public override immutable borrowPerSecondInterestRateBase;
    /// @notice The fraction of the liquidation penalty that goes to buyers of collateral instead of the protocol
    /// @dev uint64
    uint public override immutable storeFrontPriceFactor;
    /// @notice The scale for base token (must be less than 18 decimals)
    /// @dev uint64
    uint public override immutable baseScale;
    /// @notice The scale for reward tracking
    /// @dev uint64
    uint public override immutable trackingIndexScale;
    /// @notice The speed at which supply rewards are tracked (in trackingIndexScale)
    /// @dev uint64
    uint public override immutable baseTrackingSupplySpeed;
    /// @notice The speed at which borrow rewards are tracked (in trackingIndexScale)
    /// @dev uint64
    uint public override immutable baseTrackingBorrowSpeed;
    /// @notice The minimum amount of base principal wei for rewards to accrue
    /// @dev This must be large enough so as to prevent division by base wei from overflowing the 64 bit indices
    /// @dev uint104
    uint public override immutable baseMinForRewards;
    /// @notice The minimum base amount required to initiate a borrow
    uint public override immutable baseBorrowMin;
    /// @notice The minimum base token reserves which must be held before collateral is hodled
    uint public override immutable targetReserves;
    /// @notice The number of decimals for wrapped base token
    uint8 public override immutable decimals;
    /// @notice The number of assets this contract actually supports
    uint8 public override immutable numAssets;
    /// @notice Factor to divide by when accruing rewards in order to preserve 6 decimals (i.e. baseScale / 1e6)
    uint internal immutable accrualDescaleFactor;
    /** Collateral asset configuration (packed) **/
    uint256 internal immutable asset00_a;
    uint256 internal immutable asset00_b;
    uint256 internal immutable asset01_a;
    uint256 internal immutable asset01_b;
    uint256 internal immutable asset02_a;
    uint256 internal immutable asset02_b;
    uint256 internal immutable asset03_a;
    uint256 internal immutable asset03_b;
    uint256 internal immutable asset04_a;
    uint256 internal immutable asset04_b;
    uint256 internal immutable asset05_a;
    uint256 internal immutable asset05_b;
    uint256 internal immutable asset06_a;
    uint256 internal immutable asset06_b;
    uint256 internal immutable asset07_a;
    uint256 internal immutable asset07_b;
    uint256 internal immutable asset08_a;
    uint256 internal immutable asset08_b;
    uint256 internal immutable asset09_a;
    uint256 internal immutable asset09_b;
    uint256 internal immutable asset10_a;
    uint256 internal immutable asset10_b;
    uint256 internal immutable asset11_a;
    uint256 internal immutable asset11_b;
    uint256 internal immutable asset12_a;
    uint256 internal immutable asset12_b;
    uint256 internal immutable asset13_a;
    uint256 internal immutable asset13_b;
    uint256 internal immutable asset14_a;
    uint256 internal immutable asset14_b;
    /**
     * @notice Construct a new protocol instance
     * @param config The mapping of initial/constant parameters
     **/
    constructor(Configuration memory config) {
        // Sanity checks
        uint8 decimals_ = ERC20(config.baseToken).decimals();
        if (decimals_ > MAX_BASE_DECIMALS) revert BadDecimals();
        if (config.storeFrontPriceFactor > FACTOR_SCALE) revert BadDiscount();
        if (config.assetConfigs.length > MAX_ASSETS) revert TooManyAssets();
        if (config.baseMinForRewards == 0) revert BadMinimum();
        if (AggregatorV3Interface(config.baseTokenPriceFeed).decimals() != PRICE_FEED_DECIMALS) revert BadDecimals();
        // Copy configuration
        unchecked {
            governor = config.governor;
            pauseGuardian = config.pauseGuardian;
            baseToken = config.baseToken;
            baseTokenPriceFeed = config.baseTokenPriceFeed;
            extensionDelegate = config.extensionDelegate;
            storeFrontPriceFactor = config.storeFrontPriceFactor;
            decimals = decimals_;
            baseScale = uint64(10 ** decimals_);
            trackingIndexScale = config.trackingIndexScale;
            if (baseScale < BASE_ACCRUAL_SCALE) revert BadDecimals();
            accrualDescaleFactor = baseScale / BASE_ACCRUAL_SCALE;
            baseMinForRewards = config.baseMinForRewards;
            baseTrackingSupplySpeed = config.baseTrackingSupplySpeed;
            baseTrackingBorrowSpeed = config.baseTrackingBorrowSpeed;
            baseBorrowMin = config.baseBorrowMin;
            targetReserves = config.targetReserves;
        }
        // Set interest rate model configs
        unchecked {
            supplyKink = config.supplyKink;
            supplyPerSecondInterestRateSlopeLow = config.supplyPerYearInterestRateSlopeLow / SECONDS_PER_YEAR;
            supplyPerSecondInterestRateSlopeHigh = config.supplyPerYearInterestRateSlopeHigh / SECONDS_PER_YEAR;
            supplyPerSecondInterestRateBase = config.supplyPerYearInterestRateBase / SECONDS_PER_YEAR;
            borrowKink = config.borrowKink;
            borrowPerSecondInterestRateSlopeLow = config.borrowPerYearInterestRateSlopeLow / SECONDS_PER_YEAR;
            borrowPerSecondInterestRateSlopeHigh = config.borrowPerYearInterestRateSlopeHigh / SECONDS_PER_YEAR;
            borrowPerSecondInterestRateBase = config.borrowPerYearInterestRateBase / SECONDS_PER_YEAR;
        }
        // Set asset info
        numAssets = uint8(config.assetConfigs.length);
        (asset00_a, asset00_b) = getPackedAssetInternal(config.assetConfigs, 0);
        (asset01_a, asset01_b) = getPackedAssetInternal(config.assetConfigs, 1);
        (asset02_a, asset02_b) = getPackedAssetInternal(config.assetConfigs, 2);
        (asset03_a, asset03_b) = getPackedAssetInternal(config.assetConfigs, 3);
        (asset04_a, asset04_b) = getPackedAssetInternal(config.assetConfigs, 4);
        (asset05_a, asset05_b) = getPackedAssetInternal(config.assetConfigs, 5);
        (asset06_a, asset06_b) = getPackedAssetInternal(config.assetConfigs, 6);
        (asset07_a, asset07_b) = getPackedAssetInternal(config.assetConfigs, 7);
        (asset08_a, asset08_b) = getPackedAssetInternal(config.assetConfigs, 8);
        (asset09_a, asset09_b) = getPackedAssetInternal(config.assetConfigs, 9);
        (asset10_a, asset10_b) = getPackedAssetInternal(config.assetConfigs, 10);
        (asset11_a, asset11_b) = getPackedAssetInternal(config.assetConfigs, 11);
        (asset12_a, asset12_b) = getPackedAssetInternal(config.assetConfigs, 12);
        (asset13_a, asset13_b) = getPackedAssetInternal(config.assetConfigs, 13);
        (asset14_a, asset14_b) = getPackedAssetInternal(config.assetConfigs, 14);
    }
    /**
     * @notice Initialize storage for the contract
     * @dev Can be used from constructor or proxy
     */
    function initializeStorage() override external {
        if (lastAccrualTime != 0) revert AlreadyInitialized();
        // Initialize aggregates
        lastAccrualTime = getNowInternal();
        baseSupplyIndex = BASE_INDEX_SCALE;
        baseBorrowIndex = BASE_INDEX_SCALE;
        // Implicit initialization (not worth increasing contract size)
        // trackingSupplyIndex = 0;
        // trackingBorrowIndex = 0;
    }
    /**
     * @dev Checks and gets the packed asset info for storage
     */
    function getPackedAssetInternal(AssetConfig[] memory assetConfigs, uint i) internal view returns (uint256, uint256) {
        AssetConfig memory assetConfig;
        if (i < assetConfigs.length) {
            assembly {
                assetConfig := mload(add(add(assetConfigs, 0x20), mul(i, 0x20)))
            }
        } else {
            return (0, 0);
        }
        address asset = assetConfig.asset;
        address priceFeed = assetConfig.priceFeed;
        uint8 decimals_ = assetConfig.decimals;
        // Short-circuit if asset is nil
        if (asset == address(0)) {
            return (0, 0);
        }
        // Sanity check price feed and asset decimals
        if (AggregatorV3Interface(priceFeed).decimals() != PRICE_FEED_DECIMALS) revert BadDecimals();
        if (ERC20(asset).decimals() != decimals_) revert BadDecimals();
        // Ensure collateral factors are within range
        if (assetConfig.borrowCollateralFactor >= assetConfig.liquidateCollateralFactor) revert BorrowCFTooLarge();
        if (assetConfig.liquidateCollateralFactor > MAX_COLLATERAL_FACTOR) revert LiquidateCFTooLarge();
        unchecked {
            // Keep 4 decimals for each factor
            uint64 descale = FACTOR_SCALE / 1e4;
            uint16 borrowCollateralFactor = uint16(assetConfig.borrowCollateralFactor / descale);
            uint16 liquidateCollateralFactor = uint16(assetConfig.liquidateCollateralFactor / descale);
            uint16 liquidationFactor = uint16(assetConfig.liquidationFactor / descale);
            // Be nice and check descaled values are still within range
            if (borrowCollateralFactor >= liquidateCollateralFactor) revert BorrowCFTooLarge();
            // Keep whole units of asset for supply cap
            uint64 supplyCap = uint64(assetConfig.supplyCap / (10 ** decimals_));
            uint256 word_a = (uint160(asset) << 0 |
                              uint256(borrowCollateralFactor) << 160 |
                              uint256(liquidateCollateralFactor) << 176 |
                              uint256(liquidationFactor) << 192);
            uint256 word_b = (uint160(priceFeed) << 0 |
                              uint256(decimals_) << 160 |
                              uint256(supplyCap) << 168);
            return (word_a, word_b);
        }
    }
    /**
     * @notice Get the i-th asset info, according to the order they were passed in originally
     * @param i The index of the asset info to get
     * @return The asset info object
     */
    function getAssetInfo(uint8 i) override public view returns (AssetInfo memory) {
        if (i >= numAssets) revert BadAsset();
        uint256 word_a;
        uint256 word_b;
        if (i == 0) {
            word_a = asset00_a;
            word_b = asset00_b;
        } else if (i == 1) {
            word_a = asset01_a;
            word_b = asset01_b;
        } else if (i == 2) {
            word_a = asset02_a;
            word_b = asset02_b;
        } else if (i == 3) {
            word_a = asset03_a;
            word_b = asset03_b;
        } else if (i == 4) {
            word_a = asset04_a;
            word_b = asset04_b;
        } else if (i == 5) {
            word_a = asset05_a;
            word_b = asset05_b;
        } else if (i == 6) {
            word_a = asset06_a;
            word_b = asset06_b;
        } else if (i == 7) {
            word_a = asset07_a;
            word_b = asset07_b;
        } else if (i == 8) {
            word_a = asset08_a;
            word_b = asset08_b;
        } else if (i == 9) {
            word_a = asset09_a;
            word_b = asset09_b;
        } else if (i == 10) {
            word_a = asset10_a;
            word_b = asset10_b;
        } else if (i == 11) {
            word_a = asset11_a;
            word_b = asset11_b;
        } else if (i == 12) {
            word_a = asset12_a;
            word_b = asset12_b;
        } else if (i == 13) {
            word_a = asset13_a;
            word_b = asset13_b;
        } else if (i == 14) {
            word_a = asset14_a;
            word_b = asset14_b;
        } else {
            revert Absurd();
        }
        address asset = address(uint160(word_a & type(uint160).max));
        uint64 rescale = FACTOR_SCALE / 1e4;
        uint64 borrowCollateralFactor = uint64(((word_a >> 160) & type(uint16).max) * rescale);
        uint64 liquidateCollateralFactor = uint64(((word_a >> 176) & type(uint16).max) * rescale);
        uint64 liquidationFactor = uint64(((word_a >> 192) & type(uint16).max) * rescale);
        address priceFeed = address(uint160(word_b & type(uint160).max));
        uint8 decimals_ = uint8(((word_b >> 160) & type(uint8).max));
        uint64 scale = uint64(10 ** decimals_);
        uint128 supplyCap = uint128(((word_b >> 168) & type(uint64).max) * scale);
        return AssetInfo({
            offset: i,
            asset: asset,
            priceFeed: priceFeed,
            scale: scale,
            borrowCollateralFactor: borrowCollateralFactor,
            liquidateCollateralFactor: liquidateCollateralFactor,
            liquidationFactor: liquidationFactor,
            supplyCap: supplyCap
         });
    }
    /**
     * @dev Determine index of asset that matches given address
     */
    function getAssetInfoByAddress(address asset) override public view returns (AssetInfo memory) {
        for (uint8 i = 0; i < numAssets; ) {
            AssetInfo memory assetInfo = getAssetInfo(i);
            if (assetInfo.asset == asset) {
                return assetInfo;
            }
            unchecked { i++; }
        }
        revert BadAsset();
    }
    /**
     * @return The current timestamp
     **/
    function getNowInternal() virtual internal view returns (uint40) {
        if (block.timestamp >= 2**40) revert TimestampTooLarge();
        return uint40(block.timestamp);
    }
    /**
     * @dev Calculate accrued interest indices for base token supply and borrows
     **/
    function accruedInterestIndices(uint timeElapsed) internal view returns (uint64, uint64) {
        uint64 baseSupplyIndex_ = baseSupplyIndex;
        uint64 baseBorrowIndex_ = baseBorrowIndex;
        if (timeElapsed > 0) {
            uint utilization = getUtilization();
            uint supplyRate = getSupplyRate(utilization);
            uint borrowRate = getBorrowRate(utilization);
            baseSupplyIndex_ += safe64(mulFactor(baseSupplyIndex_, supplyRate * timeElapsed));
            baseBorrowIndex_ += safe64(mulFactor(baseBorrowIndex_, borrowRate * timeElapsed));
        }
        return (baseSupplyIndex_, baseBorrowIndex_);
    }
    /**
     * @dev Accrue interest (and rewards) in base token supply and borrows
     **/
    function accrueInternal() internal {
        uint40 now_ = getNowInternal();
        uint timeElapsed = uint256(now_ - lastAccrualTime);
        if (timeElapsed > 0) {
            (baseSupplyIndex, baseBorrowIndex) = accruedInterestIndices(timeElapsed);
            if (totalSupplyBase >= baseMinForRewards) {
                trackingSupplyIndex += safe64(divBaseWei(baseTrackingSupplySpeed * timeElapsed, totalSupplyBase));
            }
            if (totalBorrowBase >= baseMinForRewards) {
                trackingBorrowIndex += safe64(divBaseWei(baseTrackingBorrowSpeed * timeElapsed, totalBorrowBase));
            }
            lastAccrualTime = now_;
        }
    }
    /**
     * @notice Accrue interest and rewards for an account
     **/
    function accrueAccount(address account) override external {
        accrueInternal();
        UserBasic memory basic = userBasic[account];
        updateBasePrincipal(account, basic, basic.principal);
    }
    /**
     * @dev Note: Does not accrue interest first
     * @param utilization The utilization to check the supply rate for
     * @return The per second supply rate at `utilization`
     */
    function getSupplyRate(uint utilization) override public view returns (uint64) {
        if (utilization <= supplyKink) {
            // interestRateBase + interestRateSlopeLow * utilization
            return safe64(supplyPerSecondInterestRateBase + mulFactor(supplyPerSecondInterestRateSlopeLow, utilization));
        } else {
            // interestRateBase + interestRateSlopeLow * kink + interestRateSlopeHigh * (utilization - kink)
            return safe64(supplyPerSecondInterestRateBase + mulFactor(supplyPerSecondInterestRateSlopeLow, supplyKink) + mulFactor(supplyPerSecondInterestRateSlopeHigh, (utilization - supplyKink)));
        }
    }
    /**
     * @dev Note: Does not accrue interest first
     * @param utilization The utilization to check the borrow rate for
     * @return The per second borrow rate at `utilization`
     */
    function getBorrowRate(uint utilization) override public view returns (uint64) {
        if (utilization <= borrowKink) {
            // interestRateBase + interestRateSlopeLow * utilization
            return safe64(borrowPerSecondInterestRateBase + mulFactor(borrowPerSecondInterestRateSlopeLow, utilization));
        } else {
            // interestRateBase + interestRateSlopeLow * kink + interestRateSlopeHigh * (utilization - kink)
            return safe64(borrowPerSecondInterestRateBase + mulFactor(borrowPerSecondInterestRateSlopeLow, borrowKink) + mulFactor(borrowPerSecondInterestRateSlopeHigh, (utilization - borrowKink)));
        }
    }
    /**
     * @dev Note: Does not accrue interest first
     * @return The utilization rate of the base asset
     */
    function getUtilization() override public view returns (uint) {
        uint totalSupply_ = presentValueSupply(baseSupplyIndex, totalSupplyBase);
        uint totalBorrow_ = presentValueBorrow(baseBorrowIndex, totalBorrowBase);
        if (totalSupply_ == 0) {
            return 0;
        } else {
            return totalBorrow_ * FACTOR_SCALE / totalSupply_;
        }
    }
    /**
     * @notice Get the current price from a feed
     * @param priceFeed The address of a price feed
     * @return The price, scaled by `PRICE_SCALE`
     */
    function getPrice(address priceFeed) override public view returns (uint256) {
        (, int price, , , ) = AggregatorV3Interface(priceFeed).latestRoundData();
        if (price <= 0) revert BadPrice();
        return uint256(price);
    }
    /**
     * @notice Gets the total balance of protocol collateral reserves for an asset
     * @dev Note: Reverts if collateral reserves are somehow negative, which should not be possible
     * @param asset The collateral asset
     */
    function getCollateralReserves(address asset) override public view returns (uint) {
        return ERC20(asset).balanceOf(address(this)) - totalsCollateral[asset].totalSupplyAsset;
    }
    /**
     * @notice Gets the total amount of protocol reserves of the base asset
     */
    function getReserves() override public view returns (int) {
        (uint64 baseSupplyIndex_, uint64 baseBorrowIndex_) = accruedInterestIndices(getNowInternal() - lastAccrualTime);
        uint balance = ERC20(baseToken).balanceOf(address(this));
        uint totalSupply_ = presentValueSupply(baseSupplyIndex_, totalSupplyBase);
        uint totalBorrow_ = presentValueBorrow(baseBorrowIndex_, totalBorrowBase);
        return signed256(balance) - signed256(totalSupply_) + signed256(totalBorrow_);
    }
    /**
     * @notice Check whether an account has enough collateral to borrow
     * @param account The address to check
     * @return Whether the account is minimally collateralized enough to borrow
     */
    function isBorrowCollateralized(address account) override public view returns (bool) {
        int104 principal = userBasic[account].principal;
        if (principal >= 0) {
            return true;
        }
        uint16 assetsIn = userBasic[account].assetsIn;
        int liquidity = signedMulPrice(
            presentValue(principal),
            getPrice(baseTokenPriceFeed),
            uint64(baseScale)
        );
        for (uint8 i = 0; i < numAssets; ) {
            if (isInAsset(assetsIn, i)) {
                if (liquidity >= 0) {
                    return true;
                }
                AssetInfo memory asset = getAssetInfo(i);
                uint newAmount = mulPrice(
                    userCollateral[account][asset.asset].balance,
                    getPrice(asset.priceFeed),
                    asset.scale
                );
                liquidity += signed256(mulFactor(
                    newAmount,
                    asset.borrowCollateralFactor
                ));
            }
            unchecked { i++; }
        }
        return liquidity >= 0;
    }
    /**
     * @notice Check whether an account has enough collateral to not be liquidated
     * @param account The address to check
     * @return Whether the account is minimally collateralized enough to not be liquidated
     */
    function isLiquidatable(address account) override public view returns (bool) {
        int104 principal = userBasic[account].principal;
        if (principal >= 0) {
            return false;
        }
        uint16 assetsIn = userBasic[account].assetsIn;
        int liquidity = signedMulPrice(
            presentValue(principal),
            getPrice(baseTokenPriceFeed),
            uint64(baseScale)
        );
        for (uint8 i = 0; i < numAssets; ) {
            if (isInAsset(assetsIn, i)) {
                if (liquidity >= 0) {
                    return false;
                }
                AssetInfo memory asset = getAssetInfo(i);
                uint newAmount = mulPrice(
                    userCollateral[account][asset.asset].balance,
                    getPrice(asset.priceFeed),
                    asset.scale
                );
                liquidity += signed256(mulFactor(
                    newAmount,
                    asset.liquidateCollateralFactor
                ));
            }
            unchecked { i++; }
        }
        return liquidity < 0;
    }
    /**
     * @dev The change in principal broken into repay and supply amounts
     */
    function repayAndSupplyAmount(int104 oldPrincipal, int104 newPrincipal) internal pure returns (uint104, uint104) {
        // If the new principal is less than the old principal, then no amount has been repaid or supplied
        if (newPrincipal < oldPrincipal) return (0, 0);
        if (newPrincipal <= 0) {
            return (uint104(newPrincipal - oldPrincipal), 0);
        } else if (oldPrincipal >= 0) {
            return (0, uint104(newPrincipal - oldPrincipal));
        } else {
            return (uint104(-oldPrincipal), uint104(newPrincipal));
        }
    }
    /**
     * @dev The change in principal broken into withdraw and borrow amounts
     */
    function withdrawAndBorrowAmount(int104 oldPrincipal, int104 newPrincipal) internal pure returns (uint104, uint104) {
        // If the new principal is greater than the old principal, then no amount has been withdrawn or borrowed
        if (newPrincipal > oldPrincipal) return (0, 0);
        if (newPrincipal >= 0) {
            return (uint104(oldPrincipal - newPrincipal), 0);
        } else if (oldPrincipal <= 0) {
            return (0, uint104(oldPrincipal - newPrincipal));
        } else {
            return (uint104(oldPrincipal), uint104(-newPrincipal));
        }
    }
    /**
     * @notice Pauses different actions within Comet
     * @param supplyPaused Boolean for pausing supply actions
     * @param transferPaused Boolean for pausing transfer actions
     * @param withdrawPaused Boolean for pausing withdraw actions
     * @param absorbPaused Boolean for pausing absorb actions
     * @param buyPaused Boolean for pausing buy actions
     */
    function pause(
        bool supplyPaused,
        bool transferPaused,
        bool withdrawPaused,
        bool absorbPaused,
        bool buyPaused
    ) override external {
        if (msg.sender != governor && msg.sender != pauseGuardian) revert Unauthorized();
        pauseFlags =
            uint8(0) |
            (toUInt8(supplyPaused) << PAUSE_SUPPLY_OFFSET) |
            (toUInt8(transferPaused) << PAUSE_TRANSFER_OFFSET) |
            (toUInt8(withdrawPaused) << PAUSE_WITHDRAW_OFFSET) |
            (toUInt8(absorbPaused) << PAUSE_ABSORB_OFFSET) |
            (toUInt8(buyPaused) << PAUSE_BUY_OFFSET);
        emit PauseAction(supplyPaused, transferPaused, withdrawPaused, absorbPaused, buyPaused);
    }
    /**
     * @return Whether or not supply actions are paused
     */
    function isSupplyPaused() override public view returns (bool) {
        return toBool(pauseFlags & (uint8(1) << PAUSE_SUPPLY_OFFSET));
    }
    /**
     * @return Whether or not transfer actions are paused
     */
    function isTransferPaused() override public view returns (bool) {
        return toBool(pauseFlags & (uint8(1) << PAUSE_TRANSFER_OFFSET));
    }
    /**
     * @return Whether or not withdraw actions are paused
     */
    function isWithdrawPaused() override public view returns (bool) {
        return toBool(pauseFlags & (uint8(1) << PAUSE_WITHDRAW_OFFSET));
    }
    /**
     * @return Whether or not absorb actions are paused
     */
    function isAbsorbPaused() override public view returns (bool) {
        return toBool(pauseFlags & (uint8(1) << PAUSE_ABSORB_OFFSET));
    }
    /**
     * @return Whether or not buy actions are paused
     */
    function isBuyPaused() override public view returns (bool) {
        return toBool(pauseFlags & (uint8(1) << PAUSE_BUY_OFFSET));
    }
    /**
     * @dev Multiply a number by a factor
     */
    function mulFactor(uint n, uint factor) internal pure returns (uint) {
        return n * factor / FACTOR_SCALE;
    }
    /**
     * @dev Divide a number by an amount of base
     */
    function divBaseWei(uint n, uint baseWei) internal view returns (uint) {
        return n * baseScale / baseWei;
    }
    /**
     * @dev Multiply a `fromScale` quantity by a price, returning a common price quantity
     */
    function mulPrice(uint n, uint price, uint64 fromScale) internal pure returns (uint) {
        return n * price / fromScale;
    }
    /**
     * @dev Multiply a signed `fromScale` quantity by a price, returning a common price quantity
     */
    function signedMulPrice(int n, uint price, uint64 fromScale) internal pure returns (int) {
        return n * signed256(price) / int256(uint256(fromScale));
    }
    /**
     * @dev Divide a common price quantity by a price, returning a `toScale` quantity
     */
    function divPrice(uint n, uint price, uint64 toScale) internal pure returns (uint) {
        return n * toScale / price;
    }
    /**
     * @dev Whether user has a non-zero balance of an asset, given assetsIn flags
     */
    function isInAsset(uint16 assetsIn, uint8 assetOffset) internal pure returns (bool) {
        return (assetsIn & (uint16(1) << assetOffset) != 0);
    }
    /**
     * @dev Update assetsIn bit vector if user has entered or exited an asset
     */
    function updateAssetsIn(
        address account,
        AssetInfo memory assetInfo,
        uint128 initialUserBalance,
        uint128 finalUserBalance
    ) internal {
        if (initialUserBalance == 0 && finalUserBalance != 0) {
            // set bit for asset
            userBasic[account].assetsIn |= (uint16(1) << assetInfo.offset);
        } else if (initialUserBalance != 0 && finalUserBalance == 0) {
            // clear bit for asset
            userBasic[account].assetsIn &= ~(uint16(1) << assetInfo.offset);
        }
    }
    /**
     * @dev Write updated principal to store and tracking participation
     */
    function updateBasePrincipal(address account, UserBasic memory basic, int104 principalNew) internal {
        int104 principal = basic.principal;
        basic.principal = principalNew;
        if (principal >= 0) {
            uint indexDelta = uint256(trackingSupplyIndex - basic.baseTrackingIndex);
            basic.baseTrackingAccrued += safe64(uint104(principal) * indexDelta / trackingIndexScale / accrualDescaleFactor);
        } else {
            uint indexDelta = uint256(trackingBorrowIndex - basic.baseTrackingIndex);
            basic.baseTrackingAccrued += safe64(uint104(-principal) * indexDelta / trackingIndexScale / accrualDescaleFactor);
        }
        if (principalNew >= 0) {
            basic.baseTrackingIndex = trackingSupplyIndex;
        } else {
            basic.baseTrackingIndex = trackingBorrowIndex;
        }
        userBasic[account] = basic;
    }
    /**
     * @dev Safe ERC20 transfer in, assumes no fee is charged and amount is transferred
     */
    function doTransferIn(address asset, address from, uint amount) internal {
        bool success = ERC20(asset).transferFrom(from, address(this), amount);
        if (!success) revert TransferInFailed();
    }
    /**
     * @dev Safe ERC20 transfer out
     */
    function doTransferOut(address asset, address to, uint amount) internal {
        bool success = ERC20(asset).transfer(to, amount);
        if (!success) revert TransferOutFailed();
    }
    /**
     * @notice Supply an amount of asset to the protocol
     * @param asset The asset to supply
     * @param amount The quantity to supply
     */
    function supply(address asset, uint amount) override external {
        return supplyInternal(msg.sender, msg.sender, msg.sender, asset, amount);
    }
    /**
     * @notice Supply an amount of asset to dst
     * @param dst The address which will hold the balance
     * @param asset The asset to supply
     * @param amount The quantity to supply
     */
    function supplyTo(address dst, address asset, uint amount) override external {
        return supplyInternal(msg.sender, msg.sender, dst, asset, amount);
    }
    /**
     * @notice Supply an amount of asset from `from` to dst, if allowed
     * @param from The supplier address
     * @param dst The address which will hold the balance
     * @param asset The asset to supply
     * @param amount The quantity to supply
     */
    function supplyFrom(address from, address dst, address asset, uint amount) override external {
        return supplyInternal(msg.sender, from, dst, asset, amount);
    }
    /**
     * @dev Supply either collateral or base asset, depending on the asset, if operator is allowed
     * @dev Note: Specifying an `amount` of uint256.max will repay all of `dst`'s accrued base borrow balance
     */
    function supplyInternal(address operator, address from, address dst, address asset, uint amount) internal {
        if (isSupplyPaused()) revert Paused();
        if (!hasPermission(from, operator)) revert Unauthorized();
        if (asset == baseToken) {
            if (amount == type(uint256).max) {
                amount = borrowBalanceOf(dst);
            }
            return supplyBase(from, dst, amount);
        } else {
            return supplyCollateral(from, dst, asset, safe128(amount));
        }
    }
    /**
     * @dev Supply an amount of base asset from `from` to dst
     */
    function supplyBase(address from, address dst, uint256 amount) internal {
        doTransferIn(baseToken, from, amount);
        accrueInternal();
        UserBasic memory dstUser = userBasic[dst];
        int104 dstPrincipal = dstUser.principal;
        int256 dstBalance = presentValue(dstPrincipal) + signed256(amount);
        int104 dstPrincipalNew = principalValue(dstBalance);
        (uint104 repayAmount, uint104 supplyAmount) = repayAndSupplyAmount(dstPrincipal, dstPrincipalNew);
        totalSupplyBase += supplyAmount;
        totalBorrowBase -= repayAmount;
        updateBasePrincipal(dst, dstUser, dstPrincipalNew);
        emit Supply(from, dst, amount);
        if (supplyAmount > 0) {
            emit Transfer(address(0), dst, presentValueSupply(baseSupplyIndex, supplyAmount));
        }
    }
    /**
     * @dev Supply an amount of collateral asset from `from` to dst
     */
    function supplyCollateral(address from, address dst, address asset, uint128 amount) internal {
        doTransferIn(asset, from, amount);
        AssetInfo memory assetInfo = getAssetInfoByAddress(asset);
        TotalsCollateral memory totals = totalsCollateral[asset];
        totals.totalSupplyAsset += amount;
        if (totals.totalSupplyAsset > assetInfo.supplyCap) revert SupplyCapExceeded();
        uint128 dstCollateral = userCollateral[dst][asset].balance;
        uint128 dstCollateralNew = dstCollateral + amount;
        totalsCollateral[asset] = totals;
        userCollateral[dst][asset].balance = dstCollateralNew;
        updateAssetsIn(dst, assetInfo, dstCollateral, dstCollateralNew);
        emit SupplyCollateral(from, dst, asset, amount);
    }
    /**
     * @notice ERC20 transfer an amount of base token to dst
     * @param dst The recipient address
     * @param amount The quantity to transfer
     * @return true
     */
    function transfer(address dst, uint amount) override external returns (bool) {
        transferInternal(msg.sender, msg.sender, dst, baseToken, amount);
        return true;
    }
    /**
     * @notice ERC20 transfer an amount of base token from src to dst, if allowed
     * @param src The sender address
     * @param dst The recipient address
     * @param amount The quantity to transfer
     * @return true
     */
    function transferFrom(address src, address dst, uint amount) override external returns (bool) {
        transferInternal(msg.sender, src, dst, baseToken, amount);
        return true;
    }
    /**
     * @notice Transfer an amount of asset to dst
     * @param dst The recipient address
     * @param asset The asset to transfer
     * @param amount The quantity to transfer
     */
    function transferAsset(address dst, address asset, uint amount) override external {
        return transferInternal(msg.sender, msg.sender, dst, asset, amount);
    }
    /**
     * @notice Transfer an amount of asset from src to dst, if allowed
     * @param src The sender address
     * @param dst The recipient address
     * @param asset The asset to transfer
     * @param amount The quantity to transfer
     */
    function transferAssetFrom(address src, address dst, address asset, uint amount) override external {
        return transferInternal(msg.sender, src, dst, asset, amount);
    }
    /**
     * @dev Transfer either collateral or base asset, depending on the asset, if operator is allowed
     * @dev Note: Specifying an `amount` of uint256.max will transfer all of `src`'s accrued base balance
     */
    function transferInternal(address operator, address src, address dst, address asset, uint amount) internal {
        if (isTransferPaused()) revert Paused();
        if (!hasPermission(src, operator)) revert Unauthorized();
        if (src == dst) revert NoSelfTransfer();
        if (asset == baseToken) {
            if (amount == type(uint256).max) {
                amount = balanceOf(src);
            }
            return transferBase(src, dst, amount);
        } else {
            return transferCollateral(src, dst, asset, safe128(amount));
        }
    }
    /**
     * @dev Transfer an amount of base asset from src to dst, borrowing if possible/necessary
     */
    function transferBase(address src, address dst, uint256 amount) internal {
        accrueInternal();
        UserBasic memory srcUser = userBasic[src];
        UserBasic memory dstUser = userBasic[dst];
        int104 srcPrincipal = srcUser.principal;
        int104 dstPrincipal = dstUser.principal;
        int256 srcBalance = presentValue(srcPrincipal) - signed256(amount);
        int256 dstBalance = presentValue(dstPrincipal) + signed256(amount);
        int104 srcPrincipalNew = principalValue(srcBalance);
        int104 dstPrincipalNew = principalValue(dstBalance);
        (uint104 withdrawAmount, uint104 borrowAmount) = withdrawAndBorrowAmount(srcPrincipal, srcPrincipalNew);
        (uint104 repayAmount, uint104 supplyAmount) = repayAndSupplyAmount(dstPrincipal, dstPrincipalNew);
        // Note: Instead of `total += addAmount - subAmount` to avoid underflow errors.
        totalSupplyBase = totalSupplyBase + supplyAmount - withdrawAmount;
        totalBorrowBase = totalBorrowBase + borrowAmount - repayAmount;
        updateBasePrincipal(src, srcUser, srcPrincipalNew);
        updateBasePrincipal(dst, dstUser, dstPrincipalNew);
        if (srcBalance < 0) {
            if (uint256(-srcBalance) < baseBorrowMin) revert BorrowTooSmall();
            if (!isBorrowCollateralized(src)) revert NotCollateralized();
        }
        if (withdrawAmount > 0) {
            emit Transfer(src, address(0), presentValueSupply(baseSupplyIndex, withdrawAmount));
        }
        if (supplyAmount > 0) {
            emit Transfer(address(0), dst, presentValueSupply(baseSupplyIndex, supplyAmount));
        }
    }
    /**
     * @dev Transfer an amount of collateral asset from src to dst
     */
    function transferCollateral(address src, address dst, address asset, uint128 amount) internal {
        uint128 srcCollateral = userCollateral[src][asset].balance;
        uint128 dstCollateral = userCollateral[dst][asset].balance;
        uint128 srcCollateralNew = srcCollateral - amount;
        uint128 dstCollateralNew = dstCollateral + amount;
        userCollateral[src][asset].balance = srcCollateralNew;
        userCollateral[dst][asset].balance = dstCollateralNew;
        AssetInfo memory assetInfo = getAssetInfoByAddress(asset);
        updateAssetsIn(src, assetInfo, srcCollateral, srcCollateralNew);
        updateAssetsIn(dst, assetInfo, dstCollateral, dstCollateralNew);
        // Note: no accrue interest, BorrowCF < LiquidationCF covers small changes
        if (!isBorrowCollateralized(src)) revert NotCollateralized();
        emit TransferCollateral(src, dst, asset, amount);
    }
    /**
     * @notice Withdraw an amount of asset from the protocol
     * @param asset The asset to withdraw
     * @param amount The quantity to withdraw
     */
    function withdraw(address asset, uint amount) override external {
        return withdrawInternal(msg.sender, msg.sender, msg.sender, asset, amount);
    }
    /**
     * @notice Withdraw an amount of asset to `to`
     * @param to The recipient address
     * @param asset The asset to withdraw
     * @param amount The quantity to withdraw
     */
    function withdrawTo(address to, address asset, uint amount) override external {
        return withdrawInternal(msg.sender, msg.sender, to, asset, amount);
    }
    /**
     * @notice Withdraw an amount of asset from src to `to`, if allowed
     * @param src The sender address
     * @param to The recipient address
     * @param asset The asset to withdraw
     * @param amount The quantity to withdraw
     */
    function withdrawFrom(address src, address to, address asset, uint amount) override external {
        return withdrawInternal(msg.sender, src, to, asset, amount);
    }
    /**
     * @dev Withdraw either collateral or base asset, depending on the asset, if operator is allowed
     * @dev Note: Specifying an `amount` of uint256.max will withdraw all of `src`'s accrued base balance
     */
    function withdrawInternal(address operator, address src, address to, address asset, uint amount) internal {
        if (isWithdrawPaused()) revert Paused();
        if (!hasPermission(src, operator)) revert Unauthorized();
        if (asset == baseToken) {
            if (amount == type(uint256).max) {
                amount = balanceOf(src);
            }
            return withdrawBase(src, to, amount);
        } else {
            return withdrawCollateral(src, to, asset, safe128(amount));
        }
    }
    /**
     * @dev Withdraw an amount of base asset from src to `to`, borrowing if possible/necessary
     */
    function withdrawBase(address src, address to, uint256 amount) internal {
        accrueInternal();
        UserBasic memory srcUser = userBasic[src];
        int104 srcPrincipal = srcUser.principal;
        int256 srcBalance = presentValue(srcPrincipal) - signed256(amount);
        int104 srcPrincipalNew = principalValue(srcBalance);
        (uint104 withdrawAmount, uint104 borrowAmount) = withdrawAndBorrowAmount(srcPrincipal, srcPrincipalNew);
        totalSupplyBase -= withdrawAmount;
        totalBorrowBase += borrowAmount;
        updateBasePrincipal(src, srcUser, srcPrincipalNew);
        if (srcBalance < 0) {
            if (uint256(-srcBalance) < baseBorrowMin) revert BorrowTooSmall();
            if (!isBorrowCollateralized(src)) revert NotCollateralized();
        }
        doTransferOut(baseToken, to, amount);
        emit Withdraw(src, to, amount);
        if (withdrawAmount > 0) {
            emit Transfer(src, address(0), presentValueSupply(baseSupplyIndex, withdrawAmount));
        }
    }
    /**
     * @dev Withdraw an amount of collateral asset from src to `to`
     */
    function withdrawCollateral(address src, address to, address asset, uint128 amount) internal {
        uint128 srcCollateral = userCollateral[src][asset].balance;
        uint128 srcCollateralNew = srcCollateral - amount;
        totalsCollateral[asset].totalSupplyAsset -= amount;
        userCollateral[src][asset].balance = srcCollateralNew;
        AssetInfo memory assetInfo = getAssetInfoByAddress(asset);
        updateAssetsIn(src, assetInfo, srcCollateral, srcCollateralNew);
        // Note: no accrue interest, BorrowCF < LiquidationCF covers small changes
        if (!isBorrowCollateralized(src)) revert NotCollateralized();
        doTransferOut(asset, to, amount);
        emit WithdrawCollateral(src, to, asset, amount);
    }
    /**
     * @notice Absorb a list of underwater accounts onto the protocol balance sheet
     * @param absorber The recipient of the incentive paid to the caller of absorb
     * @param accounts The list of underwater accounts to absorb
     */
    function absorb(address absorber, address[] calldata accounts) override external {
        if (isAbsorbPaused()) revert Paused();
        uint startGas = gasleft();
        accrueInternal();
        for (uint i = 0; i < accounts.length; ) {
            absorbInternal(absorber, accounts[i]);
            unchecked { i++; }
        }
        uint gasUsed = startGas - gasleft();
        // Note: liquidator points are an imperfect tool for governance,
        //  to be used while evaluating strategies for incentivizing absorption.
        // Using gas price instead of base fee would more accurately reflect spend,
        //  but is also subject to abuse if refunds were to be given automatically.
        LiquidatorPoints memory points = liquidatorPoints[absorber];
        points.numAbsorbs++;
        points.numAbsorbed += safe64(accounts.length);
        points.approxSpend += safe128(gasUsed * block.basefee);
        liquidatorPoints[absorber] = points;
    }
    /**
     * @dev Transfer user's collateral and debt to the protocol itself.
     */
    function absorbInternal(address absorber, address account) internal {
        if (!isLiquidatable(account)) revert NotLiquidatable();
        UserBasic memory accountUser = userBasic[account];
        int104 oldPrincipal = accountUser.principal;
        int256 oldBalance = presentValue(oldPrincipal);
        uint16 assetsIn = accountUser.assetsIn;
        uint256 basePrice = getPrice(baseTokenPriceFeed);
        uint256 deltaValue = 0;
        for (uint8 i = 0; i < numAssets; ) {
            if (isInAsset(assetsIn, i)) {
                AssetInfo memory assetInfo = getAssetInfo(i);
                address asset = assetInfo.asset;
                uint128 seizeAmount = userCollateral[account][asset].balance;
                userCollateral[account][asset].balance = 0;
                totalsCollateral[asset].totalSupplyAsset -= seizeAmount;
                uint256 value = mulPrice(seizeAmount, getPrice(assetInfo.priceFeed), assetInfo.scale);
                deltaValue += mulFactor(value, assetInfo.liquidationFactor);
                emit AbsorbCollateral(absorber, account, asset, seizeAmount, value);
            }
            unchecked { i++; }
        }
        uint256 deltaBalance = divPrice(deltaValue, basePrice, uint64(baseScale));
        int256 newBalance = oldBalance + signed256(deltaBalance);
        // New balance will not be negative, all excess debt absorbed by reserves
        if (newBalance < 0) {
            newBalance = 0;
        }
        int104 newPrincipal = principalValue(newBalance);
        updateBasePrincipal(account, accountUser, newPrincipal);
        // reset assetsIn
        userBasic[account].assetsIn = 0;
        (uint104 repayAmount, uint104 supplyAmount) = repayAndSupplyAmount(oldPrincipal, newPrincipal);
        // Reserves are decreased by increasing total supply and decreasing borrows
        //  the amount of debt repaid by reserves is `newBalance - oldBalance`
        totalSupplyBase += supplyAmount;
        totalBorrowBase -= repayAmount;
        uint256 basePaidOut = unsigned256(newBalance - oldBalance);
        uint256 valueOfBasePaidOut = mulPrice(basePaidOut, basePrice, uint64(baseScale));
        emit AbsorbDebt(absorber, account, basePaidOut, valueOfBasePaidOut);
        if (newPrincipal > 0) {
            emit Transfer(address(0), account, presentValueSupply(baseSupplyIndex, unsigned104(newPrincipal)));
        }
    }
    /**
     * @notice Buy collateral from the protocol using base tokens, increasing protocol reserves
       A minimum collateral amount should be specified to indicate the maximum slippage acceptable for the buyer.
     * @param asset The asset to buy
     * @param minAmount The minimum amount of collateral tokens that should be received by the buyer
     * @param baseAmount The amount of base tokens used to buy the collateral
     * @param recipient The recipient address
     */
    function buyCollateral(address asset, uint minAmount, uint baseAmount, address recipient) override external {
        if (isBuyPaused()) revert Paused();
        int reserves = getReserves();
        if (reserves >= 0 && uint(reserves) >= targetReserves) revert NotForSale();
        // Note: Re-entrancy can skip the reserves check above on a second buyCollateral call.
        doTransferIn(baseToken, msg.sender, baseAmount);
        uint collateralAmount = quoteCollateral(asset, baseAmount);
        if (collateralAmount < minAmount) revert TooMuchSlippage();
        if (collateralAmount > getCollateralReserves(asset)) revert InsufficientReserves();
        // Note: Pre-transfer hook can re-enter buyCollateral with a stale collateral ERC20 balance.
        //  Assets should not be listed which allow re-entry from pre-transfer now, as too much collateral could be bought.
        //  This is also a problem if quoteCollateral derives its discount from the collateral ERC20 balance.
        doTransferOut(asset, recipient, safe128(collateralAmount));
        emit BuyCollateral(msg.sender, asset, baseAmount, collateralAmount);
    }
    /**
     * @notice Gets the quote for a collateral asset in exchange for an amount of base asset
     * @param asset The collateral asset to get the quote for
     * @param baseAmount The amount of the base asset to get the quote for
     * @return The quote in terms of the collateral asset
     */
    function quoteCollateral(address asset, uint baseAmount) override public view returns (uint) {
        AssetInfo memory assetInfo = getAssetInfoByAddress(asset);
        uint256 assetPrice = getPrice(assetInfo.priceFeed);
        // Store front discount is derived from the collateral asset's liquidationFactor and storeFrontPriceFactor
        // discount = storeFrontPriceFactor * (1e18 - liquidationFactor)
        uint256 discountFactor = mulFactor(storeFrontPriceFactor, FACTOR_SCALE - assetInfo.liquidationFactor);
        uint256 assetPriceDiscounted = mulFactor(assetPrice, FACTOR_SCALE - discountFactor);
        uint256 basePrice = getPrice(baseTokenPriceFeed);
        // # of collateral assets
        // = (TotalValueOfBaseAmount / DiscountedPriceOfCollateralAsset) * assetScale
        // = ((basePrice * baseAmount / baseScale) / assetPriceDiscounted) * assetScale
        return basePrice * baseAmount * assetInfo.scale / assetPriceDiscounted / baseScale;
    }
    /**
     * @notice Withdraws base token reserves if called by the governor
     * @param to An address of the receiver of withdrawn reserves
     * @param amount The amount of reserves to be withdrawn from the protocol
     */
    function withdrawReserves(address to, uint amount) override external {
        if (msg.sender != governor) revert Unauthorized();
        int reserves = getReserves();
        if (reserves < 0 || amount > unsigned256(reserves)) revert InsufficientReserves();
        doTransferOut(baseToken, to, amount);
        emit WithdrawReserves(to, amount);
    }
    /**
     * @notice Sets Comet's ERC20 allowance of an asset for a manager
     * @dev Only callable by governor
     * @dev Note: Setting the `asset` as Comet's address will allow the manager
     * to withdraw from Comet's Comet balance
     * @param asset The asset that the manager will gain approval of
     * @param manager The account which will be allowed or disallowed
     * @param amount The amount of an asset to approve
     */
    function approveThis(address manager, address asset, uint amount) override external {
        if (msg.sender != governor) revert Unauthorized();
        ERC20(asset).approve(manager, amount);
    }
    /**
     * @notice Get the total number of tokens in circulation
     * @dev Note: uses updated interest indices to calculate
     * @return The supply of tokens
     **/
    function totalSupply() override external view returns (uint256) {
        (uint64 baseSupplyIndex_, ) = accruedInterestIndices(getNowInternal() - lastAccrualTime);
        return presentValueSupply(baseSupplyIndex_, totalSupplyBase);
    }
    /**
     * @notice Get the total amount of debt
     * @dev Note: uses updated interest indices to calculate
     * @return The amount of debt
     **/
    function totalBorrow() override external view returns (uint256) {
        (, uint64 baseBorrowIndex_) = accruedInterestIndices(getNowInternal() - lastAccrualTime);
        return presentValueBorrow(baseBorrowIndex_, totalBorrowBase);
    }
    /**
     * @notice Query the current positive base balance of an account or zero
     * @dev Note: uses updated interest indices to calculate
     * @param account The account whose balance to query
     * @return The present day base balance magnitude of the account, if positive
     */
    function balanceOf(address account) override public view returns (uint256) {
        (uint64 baseSupplyIndex_, ) = accruedInterestIndices(getNowInternal() - lastAccrualTime);
        int104 principal = userBasic[account].principal;
        return principal > 0 ? presentValueSupply(baseSupplyIndex_, unsigned104(principal)) : 0;
    }
    /**
     * @notice Query the current negative base balance of an account or zero
     * @dev Note: uses updated interest indices to calculate
     * @param account The account whose balance to query
     * @return The present day base balance magnitude of the account, if negative
     */
    function borrowBalanceOf(address account) override public view returns (uint256) {
        (, uint64 baseBorrowIndex_) = accruedInterestIndices(getNowInternal() - lastAccrualTime);
        int104 principal = userBasic[account].principal;
        return principal < 0 ? presentValueBorrow(baseBorrowIndex_, unsigned104(-principal)) : 0;
    }
    /**
     * @notice Fallback to calling the extension delegate for everything else
     */
    fallback() external payable {
        address delegate = extensionDelegate;
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), delegate, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
import "./CometCore.sol";
/**
 * @title Compound's Comet Main Interface (without Ext)
 * @notice An efficient monolithic money market protocol
 * @author Compound
 */
abstract contract CometMainInterface is CometCore {
    error Absurd();
    error AlreadyInitialized();
    error BadAsset();
    error BadDecimals();
    error BadDiscount();
    error BadMinimum();
    error BadPrice();
    error BorrowTooSmall();
    error BorrowCFTooLarge();
    error InsufficientReserves();
    error LiquidateCFTooLarge();
    error NoSelfTransfer();
    error NotCollateralized();
    error NotForSale();
    error NotLiquidatable();
    error Paused();
    error SupplyCapExceeded();
    error TimestampTooLarge();
    error TooManyAssets();
    error TooMuchSlippage();
    error TransferInFailed();
    error TransferOutFailed();
    error Unauthorized();
    event Supply(address indexed from, address indexed dst, uint amount);
    event Transfer(address indexed from, address indexed to, uint amount);
    event Withdraw(address indexed src, address indexed to, uint amount);
    event SupplyCollateral(address indexed from, address indexed dst, address indexed asset, uint amount);
    event TransferCollateral(address indexed from, address indexed to, address indexed asset, uint amount);
    event WithdrawCollateral(address indexed src, address indexed to, address indexed asset, uint amount);
    /// @notice Event emitted when a borrow position is absorbed by the protocol
    event AbsorbDebt(address indexed absorber, address indexed borrower, uint basePaidOut, uint usdValue);
    /// @notice Event emitted when a user's collateral is absorbed by the protocol
    event AbsorbCollateral(address indexed absorber, address indexed borrower, address indexed asset, uint collateralAbsorbed, uint usdValue);
    /// @notice Event emitted when a collateral asset is purchased from the protocol
    event BuyCollateral(address indexed buyer, address indexed asset, uint baseAmount, uint collateralAmount);
    /// @notice Event emitted when an action is paused/unpaused
    event PauseAction(bool supplyPaused, bool transferPaused, bool withdrawPaused, bool absorbPaused, bool buyPaused);
    /// @notice Event emitted when reserves are withdrawn by the governor
    event WithdrawReserves(address indexed to, uint amount);
    function supply(address asset, uint amount) virtual external;
    function supplyTo(address dst, address asset, uint amount) virtual external;
    function supplyFrom(address from, address dst, address asset, uint amount) virtual external;
    function transfer(address dst, uint amount) virtual external returns (bool);
    function transferFrom(address src, address dst, uint amount) virtual external returns (bool);
    function transferAsset(address dst, address asset, uint amount) virtual external;
    function transferAssetFrom(address src, address dst, address asset, uint amount) virtual external;
    function withdraw(address asset, uint amount) virtual external;
    function withdrawTo(address to, address asset, uint amount) virtual external;
    function withdrawFrom(address src, address to, address asset, uint amount) virtual external;
    function approveThis(address manager, address asset, uint amount) virtual external;
    function withdrawReserves(address to, uint amount) virtual external;
    function absorb(address absorber, address[] calldata accounts) virtual external;
    function buyCollateral(address asset, uint minAmount, uint baseAmount, address recipient) virtual external;
    function quoteCollateral(address asset, uint baseAmount) virtual public view returns (uint);
    function getAssetInfo(uint8 i) virtual public view returns (AssetInfo memory);
    function getAssetInfoByAddress(address asset) virtual public view returns (AssetInfo memory);
    function getCollateralReserves(address asset) virtual public view returns (uint);
    function getReserves() virtual public view returns (int);
    function getPrice(address priceFeed) virtual public view returns (uint);
    function isBorrowCollateralized(address account) virtual public view returns (bool);
    function isLiquidatable(address account) virtual public view returns (bool);
    function totalSupply() virtual external view returns (uint256);
    function totalBorrow() virtual external view returns (uint256);
    function balanceOf(address owner) virtual public view returns (uint256);
    function borrowBalanceOf(address account) virtual public view returns (uint256);
    function pause(bool supplyPaused, bool transferPaused, bool withdrawPaused, bool absorbPaused, bool buyPaused) virtual external;
    function isSupplyPaused() virtual public view returns (bool);
    function isTransferPaused() virtual public view returns (bool);
    function isWithdrawPaused() virtual public view returns (bool);
    function isAbsorbPaused() virtual public view returns (bool);
    function isBuyPaused() virtual public view returns (bool);
    function accrueAccount(address account) virtual external;
    function getSupplyRate(uint utilization) virtual public view returns (uint64);
    function getBorrowRate(uint utilization) virtual public view returns (uint64);
    function getUtilization() virtual public view returns (uint);
    function governor() virtual external view returns (address);
    function pauseGuardian() virtual external view returns (address);
    function baseToken() virtual external view returns (address);
    function baseTokenPriceFeed() virtual external view returns (address);
    function extensionDelegate() virtual external view returns (address);
    /// @dev uint64
    function supplyKink() virtual external view returns (uint);
    /// @dev uint64
    function supplyPerSecondInterestRateSlopeLow() virtual external view returns (uint);
    /// @dev uint64
    function supplyPerSecondInterestRateSlopeHigh() virtual external view returns (uint);
    /// @dev uint64
    function supplyPerSecondInterestRateBase() virtual external view returns (uint);
    /// @dev uint64
    function borrowKink() virtual external view returns (uint);
    /// @dev uint64
    function borrowPerSecondInterestRateSlopeLow() virtual external view returns (uint);
    /// @dev uint64
    function borrowPerSecondInterestRateSlopeHigh() virtual external view returns (uint);
    /// @dev uint64
    function borrowPerSecondInterestRateBase() virtual external view returns (uint);
    /// @dev uint64
    function storeFrontPriceFactor() virtual external view returns (uint);
    /// @dev uint64
    function baseScale() virtual external view returns (uint);
    /// @dev uint64
    function trackingIndexScale() virtual external view returns (uint);
    /// @dev uint64
    function baseTrackingSupplySpeed() virtual external view returns (uint);
    /// @dev uint64
    function baseTrackingBorrowSpeed() virtual external view returns (uint);
    /// @dev uint104
    function baseMinForRewards() virtual external view returns (uint);
    /// @dev uint104
    function baseBorrowMin() virtual external view returns (uint);
    /// @dev uint104
    function targetReserves() virtual external view returns (uint);
    function numAssets() virtual external view returns (uint8);
    function decimals() virtual external view returns (uint8);
    function initializeStorage() virtual external;
}// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
/**
 * @title ERC 20 Token Standard Interface
 *  https://eips.ethereum.org/EIPS/eip-20
 */
interface ERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    /**
      * @notice Get the total number of tokens in circulation
      * @return The supply of tokens
      */
    function totalSupply() external view returns (uint256);
    /**
     * @notice Gets the balance of the specified address
     * @param owner The address from which the balance will be retrieved
     * @return The balance
     */
    function balanceOf(address owner) external view returns (uint256);
    /**
      * @notice Transfer `amount` tokens from `msg.sender` to `dst`
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      * @return Whether or not the transfer succeeded
      */
    function transfer(address dst, uint256 amount) external returns (bool);
    /**
      * @notice Transfer `amount` tokens from `src` to `dst`
      * @param src The address of the source account
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      * @return Whether or not the transfer succeeded
      */
    function transferFrom(address src, address dst, uint256 amount) external returns (bool);
    /**
      * @notice Approve `spender` to transfer up to `amount` from `src`
      * @dev This will overwrite the approval amount for `spender`
      *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
      * @param spender The address of the account which may transfer tokens
      * @param amount The number of tokens that are approved (-1 means infinite)
      * @return Whether or not the approval succeeded
      */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
      * @notice Get the current allowance from `owner` for `spender`
      * @param owner The address of the account which owns the tokens to be spent
      * @param spender The address of the account which may transfer tokens
      * @return The number of tokens allowed to be spent (-1 means infinite)
      */
    function allowance(address owner, address spender) external view returns (uint256);
    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface AggregatorV3Interface {
  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);
  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
import "./CometConfiguration.sol";
import "./CometStorage.sol";
import "./CometMath.sol";
import "./vendor/@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
abstract contract CometCore is CometConfiguration, CometStorage, CometMath {
    struct AssetInfo {
        uint8 offset;
        address asset;
        address priceFeed;
        uint64 scale;
        uint64 borrowCollateralFactor;
        uint64 liquidateCollateralFactor;
        uint64 liquidationFactor;
        uint128 supplyCap;
    }
    /** Internal constants **/
    /// @dev The max number of assets this contract is hardcoded to support
    ///  Do not change this variable without updating all the fields throughout the contract,
    //    including the size of UserBasic.assetsIn and corresponding integer conversions.
    uint8 internal constant MAX_ASSETS = 15;
    /// @dev The max number of decimals base token can have
    ///  Note this cannot just be increased arbitrarily.
    uint8 internal constant MAX_BASE_DECIMALS = 18;
    /// @dev The max value for a collateral factor (1)
    uint64 internal constant MAX_COLLATERAL_FACTOR = FACTOR_SCALE;
    /// @dev Offsets for specific actions in the pause flag bit array
    uint8 internal constant PAUSE_SUPPLY_OFFSET = 0;
    uint8 internal constant PAUSE_TRANSFER_OFFSET = 1;
    uint8 internal constant PAUSE_WITHDRAW_OFFSET = 2;
    uint8 internal constant PAUSE_ABSORB_OFFSET = 3;
    uint8 internal constant PAUSE_BUY_OFFSET = 4;
    /// @dev The decimals required for a price feed
    uint8 internal constant PRICE_FEED_DECIMALS = 8;
    /// @dev 365 days * 24 hours * 60 minutes * 60 seconds
    uint64 internal constant SECONDS_PER_YEAR = 31_536_000;
    /// @dev The scale for base tracking accrual
    uint64 internal constant BASE_ACCRUAL_SCALE = 1e6;
    /// @dev The scale for base index (depends on time/rate scales, not base token)
    uint64 internal constant BASE_INDEX_SCALE = 1e15;
    /// @dev The scale for prices (in USD)
    uint64 internal constant PRICE_SCALE = uint64(10 ** PRICE_FEED_DECIMALS);
    /// @dev The scale for factors
    uint64 internal constant FACTOR_SCALE = 1e18;
    /**
     * @notice Determine if the manager has permission to act on behalf of the owner
     * @param owner The owner account
     * @param manager The manager account
     * @return Whether or not the manager has permission
     */
    function hasPermission(address owner, address manager) public view returns (bool) {
        return owner == manager || isAllowed[owner][manager];
    }
    /**
     * @dev The positive present supply balance if positive or the negative borrow balance if negative
     */
    function presentValue(int104 principalValue_) internal view returns (int256) {
        if (principalValue_ >= 0) {
            return signed256(presentValueSupply(baseSupplyIndex, uint104(principalValue_)));
        } else {
            return -signed256(presentValueBorrow(baseBorrowIndex, uint104(-principalValue_)));
        }
    }
    /**
     * @dev The principal amount projected forward by the supply index
     */
    function presentValueSupply(uint64 baseSupplyIndex_, uint104 principalValue_) internal pure returns (uint256) {
        return uint256(principalValue_) * baseSupplyIndex_ / BASE_INDEX_SCALE;
    }
    /**
     * @dev The principal amount projected forward by the borrow index
     */
    function presentValueBorrow(uint64 baseBorrowIndex_, uint104 principalValue_) internal pure returns (uint256) {
        return uint256(principalValue_) * baseBorrowIndex_ / BASE_INDEX_SCALE;
    }
    /**
     * @dev The positive principal if positive or the negative principal if negative
     */
    function principalValue(int256 presentValue_) internal view returns (int104) {
        if (presentValue_ >= 0) {
            return signed104(principalValueSupply(baseSupplyIndex, uint256(presentValue_)));
        } else {
            return -signed104(principalValueBorrow(baseBorrowIndex, uint256(-presentValue_)));
        }
    }
    /**
     * @dev The present value projected backward by the supply index (rounded down)
     *  Note: This will overflow (revert) at 2^104/1e18=~20 trillion principal for assets with 18 decimals.
     */
    function principalValueSupply(uint64 baseSupplyIndex_, uint256 presentValue_) internal pure returns (uint104) {
        return safe104((presentValue_ * BASE_INDEX_SCALE) / baseSupplyIndex_);
    }
    /**
     * @dev The present value projected backward by the borrow index (rounded up)
     *  Note: This will overflow (revert) at 2^104/1e18=~20 trillion principal for assets with 18 decimals.
     */
    function principalValueBorrow(uint64 baseBorrowIndex_, uint256 presentValue_) internal pure returns (uint104) {
        return safe104((presentValue_ * BASE_INDEX_SCALE + baseBorrowIndex_ - 1) / baseBorrowIndex_);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
/**
 * @title Compound's Comet Configuration Interface
 * @author Compound
 */
contract CometConfiguration {
    struct ExtConfiguration {
        bytes32 name32;
        bytes32 symbol32;
    }
    struct Configuration {
        address governor;
        address pauseGuardian;
        address baseToken;
        address baseTokenPriceFeed;
        address extensionDelegate;
        uint64 supplyKink;
        uint64 supplyPerYearInterestRateSlopeLow;
        uint64 supplyPerYearInterestRateSlopeHigh;
        uint64 supplyPerYearInterestRateBase;
        uint64 borrowKink;
        uint64 borrowPerYearInterestRateSlopeLow;
        uint64 borrowPerYearInterestRateSlopeHigh;
        uint64 borrowPerYearInterestRateBase;
        uint64 storeFrontPriceFactor;
        uint64 trackingIndexScale;
        uint64 baseTrackingSupplySpeed;
        uint64 baseTrackingBorrowSpeed;
        uint104 baseMinForRewards;
        uint104 baseBorrowMin;
        uint104 targetReserves;
        AssetConfig[] assetConfigs;
    }
    struct AssetConfig {
        address asset;
        address priceFeed;
        uint8 decimals;
        uint64 borrowCollateralFactor;
        uint64 liquidateCollateralFactor;
        uint64 liquidationFactor;
        uint128 supplyCap;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
/**
 * @title Compound's Comet Storage Interface
 * @dev Versions can enforce append-only storage slots via inheritance.
 * @author Compound
 */
contract CometStorage {
    // 512 bits total = 2 slots
    struct TotalsBasic {
        // 1st slot
        uint64 baseSupplyIndex;
        uint64 baseBorrowIndex;
        uint64 trackingSupplyIndex;
        uint64 trackingBorrowIndex;
        // 2nd slot
        uint104 totalSupplyBase;
        uint104 totalBorrowBase;
        uint40 lastAccrualTime;
        uint8 pauseFlags;
    }
    struct TotalsCollateral {
        uint128 totalSupplyAsset;
        uint128 _reserved;
    }
    struct UserBasic {
        int104 principal;
        uint64 baseTrackingIndex;
        uint64 baseTrackingAccrued;
        uint16 assetsIn;
        uint8 _reserved;
    }
    struct UserCollateral {
        uint128 balance;
        uint128 _reserved;
    }
    struct LiquidatorPoints {
        uint32 numAbsorbs;
        uint64 numAbsorbed;
        uint128 approxSpend;
        uint32 _reserved;
    }
    /// @dev Aggregate variables tracked for the entire market
    uint64 internal baseSupplyIndex;
    uint64 internal baseBorrowIndex;
    uint64 internal trackingSupplyIndex;
    uint64 internal trackingBorrowIndex;
    uint104 internal totalSupplyBase;
    uint104 internal totalBorrowBase;
    uint40 internal lastAccrualTime;
    uint8 internal pauseFlags;
    /// @notice Aggregate variables tracked for each collateral asset
    mapping(address => TotalsCollateral) public totalsCollateral;
    /// @notice Mapping of users to accounts which may be permitted to manage the user account
    mapping(address => mapping(address => bool)) public isAllowed;
    /// @notice The next expected nonce for an address, for validating authorizations via signature
    mapping(address => uint) public userNonce;
    /// @notice Mapping of users to base principal and other basic data
    mapping(address => UserBasic) public userBasic;
    /// @notice Mapping of users to collateral data per collateral asset
    mapping(address => mapping(address => UserCollateral)) public userCollateral;
    /// @notice Mapping of magic liquidator points
    mapping(address => LiquidatorPoints) public liquidatorPoints;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.15;
/**
 * @title Compound's Comet Math Contract
 * @dev Pure math functions
 * @author Compound
 */
contract CometMath {
    /** Custom errors **/
    error InvalidUInt64();
    error InvalidUInt104();
    error InvalidUInt128();
    error InvalidInt104();
    error InvalidInt256();
    error NegativeNumber();
    function safe64(uint n) internal pure returns (uint64) {
        if (n > type(uint64).max) revert InvalidUInt64();
        return uint64(n);
    }
    function safe104(uint n) internal pure returns (uint104) {
        if (n > type(uint104).max) revert InvalidUInt104();
        return uint104(n);
    }
    function safe128(uint n) internal pure returns (uint128) {
        if (n > type(uint128).max) revert InvalidUInt128();
        return uint128(n);
    }
    function signed104(uint104 n) internal pure returns (int104) {
        if (n > uint104(type(int104).max)) revert InvalidInt104();
        return int104(n);
    }
    function signed256(uint256 n) internal pure returns (int256) {
        if (n > uint256(type(int256).max)) revert InvalidInt256();
        return int256(n);
    }
    function unsigned104(int104 n) internal pure returns (uint104) {
        if (n < 0) revert NegativeNumber();
        return uint104(n);
    }
    function unsigned256(int256 n) internal pure returns (uint256) {
        if (n < 0) revert NegativeNumber();
        return uint256(n);
    }
    function toUInt8(bool x) internal pure returns (uint8) {
        return x ? 1 : 0;
    }
    function toBool(uint8 x) internal pure returns (bool) {
        return x != 0;
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

// File: contracts/v1/AbstractFiatTokenV1.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

abstract contract AbstractFiatTokenV1 is IERC20 {
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal virtual;

    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal virtual;
}

// File: contracts/v1/Ownable.sol

/**
 * Copyright (c) 2018 zOS Global Limited.
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
pragma solidity 0.6.12;

/**
 * @notice The Ownable contract has an owner address, and provides basic
 * authorization control functions
 * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol
 * Modifications:
 * 1. Consolidate OwnableStorage into this contract (7/13/18)
 * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)
 * 3. Make public functions external (5/27/20)
 */
contract Ownable {
    // Owner of the contract
    address private _owner;

    /**
     * @dev Event to show ownership has been transferred
     * @param previousOwner representing the address of the previous owner
     * @param newOwner representing the address of the new owner
     */
    event OwnershipTransferred(address previousOwner, address newOwner);

    /**
     * @dev The constructor sets the original owner of the contract to the sender account.
     */
    constructor() public {
        setOwner(msg.sender);
    }

    /**
     * @dev Tells the address of the owner
     * @return the address of the owner
     */
    function owner() external view returns (address) {
        return _owner;
    }

    /**
     * @dev Sets a new owner address
     */
    function setOwner(address newOwner) internal {
        _owner = newOwner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == _owner, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) external onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        setOwner(newOwner);
    }
}

// File: contracts/v1/Pausable.sol

/**
 * Copyright (c) 2016 Smart Contract Solutions, Inc.
 * Copyright (c) 2018-2020 CENTRE SECZ0
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @notice Base contract which allows children to implement an emergency stop
 * mechanism
 * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol
 * Modifications:
 * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)
 * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)
 * 3. Removed whenPaused (6/14/2018)
 * 4. Switches ownable library to use ZeppelinOS (7/12/18)
 * 5. Remove constructor (7/13/18)
 * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)
 * 7. Make public functions external (5/27/20)
 */
contract Pausable is Ownable {
    event Pause();
    event Unpause();
    event PauserChanged(address indexed newAddress);

    address public pauser;
    bool public paused = false;

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!paused, "Pausable: paused");
        _;
    }

    /**
     * @dev throws if called by any account other than the pauser
     */
    modifier onlyPauser() {
        require(msg.sender == pauser, "Pausable: caller is not the pauser");
        _;
    }

    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() external onlyPauser {
        paused = true;
        emit Pause();
    }

    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() external onlyPauser {
        paused = false;
        emit Unpause();
    }

    /**
     * @dev update the pauser role
     */
    function updatePauser(address _newPauser) external onlyOwner {
        require(
            _newPauser != address(0),
            "Pausable: new pauser is the zero address"
        );
        pauser = _newPauser;
        emit PauserChanged(pauser);
    }
}

// File: contracts/v1/Blacklistable.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title Blacklistable Token
 * @dev Allows accounts to be blacklisted by a "blacklister" role
 */
contract Blacklistable is Ownable {
    address public blacklister;
    mapping(address => bool) internal blacklisted;

    event Blacklisted(address indexed _account);
    event UnBlacklisted(address indexed _account);
    event BlacklisterChanged(address indexed newBlacklister);

    /**
     * @dev Throws if called by any account other than the blacklister
     */
    modifier onlyBlacklister() {
        require(
            msg.sender == blacklister,
            "Blacklistable: caller is not the blacklister"
        );
        _;
    }

    /**
     * @dev Throws if argument account is blacklisted
     * @param _account The address to check
     */
    modifier notBlacklisted(address _account) {
        require(
            !blacklisted[_account],
            "Blacklistable: account is blacklisted"
        );
        _;
    }

    /**
     * @dev Checks if account is blacklisted
     * @param _account The address to check
     */
    function isBlacklisted(address _account) external view returns (bool) {
        return blacklisted[_account];
    }

    /**
     * @dev Adds account to blacklist
     * @param _account The address to blacklist
     */
    function blacklist(address _account) external onlyBlacklister {
        blacklisted[_account] = true;
        emit Blacklisted(_account);
    }

    /**
     * @dev Removes account from blacklist
     * @param _account The address to remove from the blacklist
     */
    function unBlacklist(address _account) external onlyBlacklister {
        blacklisted[_account] = false;
        emit UnBlacklisted(_account);
    }

    function updateBlacklister(address _newBlacklister) external onlyOwner {
        require(
            _newBlacklister != address(0),
            "Blacklistable: new blacklister is the zero address"
        );
        blacklister = _newBlacklister;
        emit BlacklisterChanged(blacklister);
    }
}

// File: contracts/v1/FiatTokenV1.sol

/**
 *
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title FiatToken
 * @dev ERC20 Token backed by fiat reserves
 */
contract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {
    using SafeMath for uint256;

    string public name;
    string public symbol;
    uint8 public decimals;
    string public currency;
    address public masterMinter;
    bool internal initialized;

    mapping(address => uint256) internal balances;
    mapping(address => mapping(address => uint256)) internal allowed;
    uint256 internal totalSupply_ = 0;
    mapping(address => bool) internal minters;
    mapping(address => uint256) internal minterAllowed;

    event Mint(address indexed minter, address indexed to, uint256 amount);
    event Burn(address indexed burner, uint256 amount);
    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);
    event MinterRemoved(address indexed oldMinter);
    event MasterMinterChanged(address indexed newMasterMinter);

    function initialize(
        string memory tokenName,
        string memory tokenSymbol,
        string memory tokenCurrency,
        uint8 tokenDecimals,
        address newMasterMinter,
        address newPauser,
        address newBlacklister,
        address newOwner
    ) public {
        require(!initialized, "FiatToken: contract is already initialized");
        require(
            newMasterMinter != address(0),
            "FiatToken: new masterMinter is the zero address"
        );
        require(
            newPauser != address(0),
            "FiatToken: new pauser is the zero address"
        );
        require(
            newBlacklister != address(0),
            "FiatToken: new blacklister is the zero address"
        );
        require(
            newOwner != address(0),
            "FiatToken: new owner is the zero address"
        );

        name = tokenName;
        symbol = tokenSymbol;
        currency = tokenCurrency;
        decimals = tokenDecimals;
        masterMinter = newMasterMinter;
        pauser = newPauser;
        blacklister = newBlacklister;
        setOwner(newOwner);
        initialized = true;
    }

    /**
     * @dev Throws if called by any account other than a minter
     */
    modifier onlyMinters() {
        require(minters[msg.sender], "FiatToken: caller is not a minter");
        _;
    }

    /**
     * @dev Function to mint tokens
     * @param _to The address that will receive the minted tokens.
     * @param _amount The amount of tokens to mint. Must be less than or equal
     * to the minterAllowance of the caller.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address _to, uint256 _amount)
        external
        whenNotPaused
        onlyMinters
        notBlacklisted(msg.sender)
        notBlacklisted(_to)
        returns (bool)
    {
        require(_to != address(0), "FiatToken: mint to the zero address");
        require(_amount > 0, "FiatToken: mint amount not greater than 0");

        uint256 mintingAllowedAmount = minterAllowed[msg.sender];
        require(
            _amount <= mintingAllowedAmount,
            "FiatToken: mint amount exceeds minterAllowance"
        );

        totalSupply_ = totalSupply_.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);
        emit Mint(msg.sender, _to, _amount);
        emit Transfer(address(0), _to, _amount);
        return true;
    }

    /**
     * @dev Throws if called by any account other than the masterMinter
     */
    modifier onlyMasterMinter() {
        require(
            msg.sender == masterMinter,
            "FiatToken: caller is not the masterMinter"
        );
        _;
    }

    /**
     * @dev Get minter allowance for an account
     * @param minter The address of the minter
     */
    function minterAllowance(address minter) external view returns (uint256) {
        return minterAllowed[minter];
    }

    /**
     * @dev Checks if account is a minter
     * @param account The address to check
     */
    function isMinter(address account) external view returns (bool) {
        return minters[account];
    }

    /**
     * @notice Amount of remaining tokens spender is allowed to transfer on
     * behalf of the token owner
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @return Allowance amount
     */
    function allowance(address owner, address spender)
        external
        override
        view
        returns (uint256)
    {
        return allowed[owner][spender];
    }

    /**
     * @dev Get totalSupply of token
     */
    function totalSupply() external override view returns (uint256) {
        return totalSupply_;
    }

    /**
     * @dev Get token balance of an account
     * @param account address The account
     */
    function balanceOf(address account)
        external
        override
        view
        returns (uint256)
    {
        return balances[account];
    }

    /**
     * @notice Set spender's allowance over the caller's tokens to be a given
     * value.
     * @param spender   Spender's address
     * @param value     Allowance amount
     * @return True if successful
     */
    function approve(address spender, uint256 value)
        external
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Internal function to set allowance
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @param value     Allowance amount
     */
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal override {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @notice Transfer tokens by spending allowance
     * @param from  Payer's address
     * @param to    Payee's address
     * @param value Transfer amount
     * @return True if successful
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    )
        external
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(from)
        notBlacklisted(to)
        returns (bool)
    {
        require(
            value <= allowed[from][msg.sender],
            "ERC20: transfer amount exceeds allowance"
        );
        _transfer(from, to, value);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);
        return true;
    }

    /**
     * @notice Transfer tokens from the caller
     * @param to    Payee's address
     * @param value Transfer amount
     * @return True if successful
     */
    function transfer(address to, uint256 value)
        external
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(to)
        returns (bool)
    {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @notice Internal function to process transfers
     * @param from  Payer's address
     * @param to    Payee's address
     * @param value Transfer amount
     */
    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(
            value <= balances[from],
            "ERC20: transfer amount exceeds balance"
        );

        balances[from] = balances[from].sub(value);
        balances[to] = balances[to].add(value);
        emit Transfer(from, to, value);
    }

    /**
     * @dev Function to add/update a new minter
     * @param minter The address of the minter
     * @param minterAllowedAmount The minting amount allowed for the minter
     * @return True if the operation was successful.
     */
    function configureMinter(address minter, uint256 minterAllowedAmount)
        external
        whenNotPaused
        onlyMasterMinter
        returns (bool)
    {
        minters[minter] = true;
        minterAllowed[minter] = minterAllowedAmount;
        emit MinterConfigured(minter, minterAllowedAmount);
        return true;
    }

    /**
     * @dev Function to remove a minter
     * @param minter The address of the minter to remove
     * @return True if the operation was successful.
     */
    function removeMinter(address minter)
        external
        onlyMasterMinter
        returns (bool)
    {
        minters[minter] = false;
        minterAllowed[minter] = 0;
        emit MinterRemoved(minter);
        return true;
    }

    /**
     * @dev allows a minter to burn some of its own tokens
     * Validates that caller is a minter and that sender is not blacklisted
     * amount is less than or equal to the minter's account balance
     * @param _amount uint256 the amount of tokens to be burned
     */
    function burn(uint256 _amount)
        external
        whenNotPaused
        onlyMinters
        notBlacklisted(msg.sender)
    {
        uint256 balance = balances[msg.sender];
        require(_amount > 0, "FiatToken: burn amount not greater than 0");
        require(balance >= _amount, "FiatToken: burn amount exceeds balance");

        totalSupply_ = totalSupply_.sub(_amount);
        balances[msg.sender] = balance.sub(_amount);
        emit Burn(msg.sender, _amount);
        emit Transfer(msg.sender, address(0), _amount);
    }

    function updateMasterMinter(address _newMasterMinter) external onlyOwner {
        require(
            _newMasterMinter != address(0),
            "FiatToken: new masterMinter is the zero address"
        );
        masterMinter = _newMasterMinter;
        emit MasterMinterChanged(masterMinter);
    }
}

// File: @openzeppelin/contracts/utils/Address.sol

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;

            bytes32 accountHash
         = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @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"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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"
        );
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{
            value: weiValue
        }(data);
        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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

pragma solidity ^0.6.0;

/**
 * @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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(
            value
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _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
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

// File: contracts/v1.1/Rescuable.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

contract Rescuable is Ownable {
    using SafeERC20 for IERC20;

    address private _rescuer;

    event RescuerChanged(address indexed newRescuer);

    /**
     * @notice Returns current rescuer
     * @return Rescuer's address
     */
    function rescuer() external view returns (address) {
        return _rescuer;
    }

    /**
     * @notice Revert if called by any account other than the rescuer.
     */
    modifier onlyRescuer() {
        require(msg.sender == _rescuer, "Rescuable: caller is not the rescuer");
        _;
    }

    /**
     * @notice Rescue ERC20 tokens locked up in this contract.
     * @param tokenContract ERC20 token contract address
     * @param to        Recipient address
     * @param amount    Amount to withdraw
     */
    function rescueERC20(
        IERC20 tokenContract,
        address to,
        uint256 amount
    ) external onlyRescuer {
        tokenContract.safeTransfer(to, amount);
    }

    /**
     * @notice Assign the rescuer role to a given address.
     * @param newRescuer New rescuer's address
     */
    function updateRescuer(address newRescuer) external onlyOwner {
        require(
            newRescuer != address(0),
            "Rescuable: new rescuer is the zero address"
        );
        _rescuer = newRescuer;
        emit RescuerChanged(newRescuer);
    }
}

// File: contracts/v1.1/FiatTokenV1_1.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title FiatTokenV1_1
 * @dev ERC20 Token backed by fiat reserves
 */
contract FiatTokenV1_1 is FiatTokenV1, Rescuable {

}

// File: contracts/v2/AbstractFiatTokenV2.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

abstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {
    function _increaseAllowance(
        address owner,
        address spender,
        uint256 increment
    ) internal virtual;

    function _decreaseAllowance(
        address owner,
        address spender,
        uint256 decrement
    ) internal virtual;
}

// File: contracts/util/ECRecover.sol

/**
 * Copyright (c) 2016-2019 zOS Global Limited
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title ECRecover
 * @notice A library that provides a safe ECDSA recovery function
 */
library ECRecover {
    /**
     * @notice Recover signer's address from a signed message
     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol
     * Modifications: Accept v, r, and s as separate arguments
     * @param digest    Keccak-256 hash digest of the signed message
     * @param v         v of the signature
     * @param r         r of the signature
     * @param s         s of the signature
     * @return Signer address
     */
    function recover(
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (
            uint256(s) >
            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
        ) {
            revert("ECRecover: invalid signature 's' value");
        }

        if (v != 27 && v != 28) {
            revert("ECRecover: invalid signature 'v' value");
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(digest, v, r, s);
        require(signer != address(0), "ECRecover: invalid signature");

        return signer;
    }
}

// File: contracts/util/EIP712.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title EIP712
 * @notice A library that provides EIP712 helper functions
 */
library EIP712 {
    /**
     * @notice Make EIP712 domain separator
     * @param name      Contract name
     * @param version   Contract version
     * @return Domain separator
     */
    function makeDomainSeparator(string memory name, string memory version)
        internal
        view
        returns (bytes32)
    {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return
            keccak256(
                abi.encode(
                    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,
                    keccak256(bytes(name)),
                    keccak256(bytes(version)),
                    chainId,
                    address(this)
                )
            );
    }

    /**
     * @notice Recover signer's address from a EIP712 signature
     * @param domainSeparator   Domain separator
     * @param v                 v of the signature
     * @param r                 r of the signature
     * @param s                 s of the signature
     * @param typeHashAndData   Type hash concatenated with data
     * @return Signer's address
     */
    function recover(
        bytes32 domainSeparator,
        uint8 v,
        bytes32 r,
        bytes32 s,
        bytes memory typeHashAndData
    ) internal pure returns (address) {
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                keccak256(typeHashAndData)
            )
        );
        return ECRecover.recover(digest, v, r, s);
    }
}

// File: contracts/v2/EIP712Domain.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title EIP712 Domain
 */
contract EIP712Domain {
    /**
     * @dev EIP712 Domain Separator
     */
    bytes32 public DOMAIN_SEPARATOR;
}

// File: contracts/v2/EIP3009.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title EIP-3009
 * @notice Provide internal implementation for gas-abstracted transfers
 * @dev Contracts that inherit from this must wrap these with publicly
 * accessible functions, optionally adding modifiers where necessary
 */
abstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {
    // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    bytes32
        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;

    // keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    bytes32
        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;

    // keccak256("CancelAuthorization(address authorizer,bytes32 nonce)")
    bytes32
        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;

    /**
     * @dev authorizer address => nonce => bool (true if nonce is used)
     */
    mapping(address => mapping(bytes32 => bool)) private _authorizationStates;

    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);
    event AuthorizationCanceled(
        address indexed authorizer,
        bytes32 indexed nonce
    );

    /**
     * @notice Returns the state of an authorization
     * @dev Nonces are randomly generated 32-byte data unique to the
     * authorizer's address
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @return True if the nonce is used
     */
    function authorizationState(address authorizer, bytes32 nonce)
        external
        view
        returns (bool)
    {
        return _authorizationStates[authorizer][nonce];
    }

    /**
     * @notice Execute a transfer with a signed authorization
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _requireValidAuthorization(from, nonce, validAfter, validBefore);

        bytes memory data = abi.encode(
            TRANSFER_WITH_AUTHORIZATION_TYPEHASH,
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce
        );
        require(
            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,
            "FiatTokenV2: invalid signature"
        );

        _markAuthorizationAsUsed(from, nonce);
        _transfer(from, to, value);
    }

    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        require(to == msg.sender, "FiatTokenV2: caller must be the payee");
        _requireValidAuthorization(from, nonce, validAfter, validBefore);

        bytes memory data = abi.encode(
            RECEIVE_WITH_AUTHORIZATION_TYPEHASH,
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce
        );
        require(
            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from,
            "FiatTokenV2: invalid signature"
        );

        _markAuthorizationAsUsed(from, nonce);
        _transfer(from, to, value);
    }

    /**
     * @notice Attempt to cancel an authorization
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _requireUnusedAuthorization(authorizer, nonce);

        bytes memory data = abi.encode(
            CANCEL_AUTHORIZATION_TYPEHASH,
            authorizer,
            nonce
        );
        require(
            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer,
            "FiatTokenV2: invalid signature"
        );

        _authorizationStates[authorizer][nonce] = true;
        emit AuthorizationCanceled(authorizer, nonce);
    }

    /**
     * @notice Check that an authorization is unused
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     */
    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)
        private
        view
    {
        require(
            !_authorizationStates[authorizer][nonce],
            "FiatTokenV2: authorization is used or canceled"
        );
    }

    /**
     * @notice Check that authorization is valid
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     */
    function _requireValidAuthorization(
        address authorizer,
        bytes32 nonce,
        uint256 validAfter,
        uint256 validBefore
    ) private view {
        require(
            now > validAfter,
            "FiatTokenV2: authorization is not yet valid"
        );
        require(now < validBefore, "FiatTokenV2: authorization is expired");
        _requireUnusedAuthorization(authorizer, nonce);
    }

    /**
     * @notice Mark an authorization as used
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     */
    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)
        private
    {
        _authorizationStates[authorizer][nonce] = true;
        emit AuthorizationUsed(authorizer, nonce);
    }
}

// File: contracts/v2/EIP2612.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title EIP-2612
 * @notice Provide internal implementation for gas-abstracted approvals
 */
abstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")
    bytes32
        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    mapping(address => uint256) private _permitNonces;

    /**
     * @notice Nonces for permit
     * @param owner Token owner's address (Authorizer)
     * @return Next nonce
     */
    function nonces(address owner) external view returns (uint256) {
        return _permitNonces[owner];
    }

    /**
     * @notice Verify a signed approval permit and execute if valid
     * @param owner     Token owner's address (Authorizer)
     * @param spender   Spender's address
     * @param value     Amount of allowance
     * @param deadline  The time at which this expires (unix time)
     * @param v         v of the signature
     * @param r         r of the signature
     * @param s         s of the signature
     */
    function _permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        require(deadline >= now, "FiatTokenV2: permit is expired");

        bytes memory data = abi.encode(
            PERMIT_TYPEHASH,
            owner,
            spender,
            value,
            _permitNonces[owner]++,
            deadline
        );
        require(
            EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner,
            "EIP2612: invalid signature"
        );

        _approve(owner, spender, value);
    }
}

// File: contracts/v2/FiatTokenV2.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @title FiatToken V2
 * @notice ERC20 Token backed by fiat reserves, version 2
 */
contract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {
    uint8 internal _initializedVersion;

    /**
     * @notice Initialize v2
     * @param newName   New token name
     */
    function initializeV2(string calldata newName) external {
        // solhint-disable-next-line reason-string
        require(initialized && _initializedVersion == 0);
        name = newName;
        DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(newName, "2");
        _initializedVersion = 1;
    }

    /**
     * @notice Increase the allowance by a given increment
     * @param spender   Spender's address
     * @param increment Amount of increase in allowance
     * @return True if successful
     */
    function increaseAllowance(address spender, uint256 increment)
        external
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _increaseAllowance(msg.sender, spender, increment);
        return true;
    }

    /**
     * @notice Decrease the allowance by a given decrement
     * @param spender   Spender's address
     * @param decrement Amount of decrease in allowance
     * @return True if successful
     */
    function decreaseAllowance(address spender, uint256 decrement)
        external
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _decreaseAllowance(msg.sender, spender, decrement);
        return true;
    }

    /**
     * @notice Execute a transfer with a signed authorization
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _transferWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            v,
            r,
            s
        );
    }

    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _receiveWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            v,
            r,
            s
        );
    }

    /**
     * @notice Attempt to cancel an authorization
     * @dev Works only if the authorization is not yet used.
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused {
        _cancelAuthorization(authorizer, nonce, v, r, s);
    }

    /**
     * @notice Update allowance with a signed permit
     * @param owner       Token owner's address (Authorizer)
     * @param spender     Spender's address
     * @param value       Amount of allowance
     * @param deadline    Expiration time, seconds since the epoch
     * @param v           v of the signature
     * @param r           r of the signature
     * @param s           s of the signature
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused notBlacklisted(owner) notBlacklisted(spender) {
        _permit(owner, spender, value, deadline, v, r, s);
    }

    /**
     * @notice Internal function to increase the allowance by a given increment
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @param increment Amount of increase
     */
    function _increaseAllowance(
        address owner,
        address spender,
        uint256 increment
    ) internal override {
        _approve(owner, spender, allowed[owner][spender].add(increment));
    }

    /**
     * @notice Internal function to decrease the allowance by a given decrement
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @param decrement Amount of decrease
     */
    function _decreaseAllowance(
        address owner,
        address spender,
        uint256 decrement
    ) internal override {
        _approve(
            owner,
            spender,
            allowed[owner][spender].sub(
                decrement,
                "ERC20: decreased allowance below zero"
            )
        );
    }
}

// File: contracts/v2/FiatTokenV2_1.sol

/**
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

// solhint-disable func-name-mixedcase

/**
 * @title FiatToken V2.1
 * @notice ERC20 Token backed by fiat reserves, version 2.1
 */
contract FiatTokenV2_1 is FiatTokenV2 {
    /**
     * @notice Initialize v2.1
     * @param lostAndFound  The address to which the locked funds are sent
     */
    function initializeV2_1(address lostAndFound) external {
        // solhint-disable-next-line reason-string
        require(_initializedVersion == 1);

        uint256 lockedAmount = balances[address(this)];
        if (lockedAmount > 0) {
            _transfer(address(this), lostAndFound, lockedAmount);
        }
        blacklisted[address(this)] = true;

        _initializedVersion = 2;
    }

    /**
     * @notice Version string for the EIP712 domain separator
     * @return Version string
     */
    function version() external view returns (string memory) {
        return "2";
    }
}