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//SPDX-License-Identifier: MIT
pragma solidity ~0.8.17;

import "./StablePriceOracle.sol";

contract ExponentialPremiumPriceOracle is StablePriceOracle {
    uint256 constant GRACE_PERIOD = 90 days;
    uint256 immutable startPremium;
    uint256 immutable endValue;

    constructor(
        AggregatorInterface _usdOracle,
        uint256[] memory _rentPrices,
        uint256 _startPremium,
        uint256 totalDays
    ) StablePriceOracle(_usdOracle, _rentPrices) {
        startPremium = _startPremium;
        endValue = _startPremium >> totalDays;
    }

    uint256 constant PRECISION = 1e18;
    uint256 constant bit1 = 999989423469314432; // 0.5 ^ 1/65536 * (10 ** 18)
    uint256 constant bit2 = 999978847050491904; // 0.5 ^ 2/65536 * (10 ** 18)
    uint256 constant bit3 = 999957694548431104;
    uint256 constant bit4 = 999915390886613504;
    uint256 constant bit5 = 999830788931929088;
    uint256 constant bit6 = 999661606496243712;
    uint256 constant bit7 = 999323327502650752;
    uint256 constant bit8 = 998647112890970240;
    uint256 constant bit9 = 997296056085470080;
    uint256 constant bit10 = 994599423483633152;
    uint256 constant bit11 = 989228013193975424;
    uint256 constant bit12 = 978572062087700096;
    uint256 constant bit13 = 957603280698573696;
    uint256 constant bit14 = 917004043204671232;
    uint256 constant bit15 = 840896415253714560;
    uint256 constant bit16 = 707106781186547584;

    /**
     * @dev Returns the pricing premium in internal base units.
     */
    function _premium(
        string memory,
        uint256 expires,
        uint256
    ) internal view override returns (uint256) {
        expires = expires + GRACE_PERIOD;
        if (expires > block.timestamp) {
            return 0;
        }

        uint256 elapsed = block.timestamp - expires;
        uint256 premium = decayedPremium(startPremium, elapsed);
        if (premium >= endValue) {
            return premium - endValue;
        }
        return 0;
    }

    /**
     * @dev Returns the premium price at current time elapsed
     * @param startPremium starting price
     * @param elapsed time past since expiry
     */
    function decayedPremium(
        uint256 startPremium,
        uint256 elapsed
    ) public pure returns (uint256) {
        uint256 daysPast = (elapsed * PRECISION) / 1 days;
        uint256 intDays = daysPast / PRECISION;
        uint256 premium = startPremium >> intDays;
        uint256 partDay = (daysPast - intDays * PRECISION);
        uint256 fraction = (partDay * (2 ** 16)) / PRECISION;
        uint256 totalPremium = addFractionalPremium(fraction, premium);
        return totalPremium;
    }

    function addFractionalPremium(
        uint256 fraction,
        uint256 premium
    ) internal pure returns (uint256) {
        if (fraction & (1 << 0) != 0) {
            premium = (premium * bit1) / PRECISION;
        }
        if (fraction & (1 << 1) != 0) {
            premium = (premium * bit2) / PRECISION;
        }
        if (fraction & (1 << 2) != 0) {
            premium = (premium * bit3) / PRECISION;
        }
        if (fraction & (1 << 3) != 0) {
            premium = (premium * bit4) / PRECISION;
        }
        if (fraction & (1 << 4) != 0) {
            premium = (premium * bit5) / PRECISION;
        }
        if (fraction & (1 << 5) != 0) {
            premium = (premium * bit6) / PRECISION;
        }
        if (fraction & (1 << 6) != 0) {
            premium = (premium * bit7) / PRECISION;
        }
        if (fraction & (1 << 7) != 0) {
            premium = (premium * bit8) / PRECISION;
        }
        if (fraction & (1 << 8) != 0) {
            premium = (premium * bit9) / PRECISION;
        }
        if (fraction & (1 << 9) != 0) {
            premium = (premium * bit10) / PRECISION;
        }
        if (fraction & (1 << 10) != 0) {
            premium = (premium * bit11) / PRECISION;
        }
        if (fraction & (1 << 11) != 0) {
            premium = (premium * bit12) / PRECISION;
        }
        if (fraction & (1 << 12) != 0) {
            premium = (premium * bit13) / PRECISION;
        }
        if (fraction & (1 << 13) != 0) {
            premium = (premium * bit14) / PRECISION;
        }
        if (fraction & (1 << 14) != 0) {
            premium = (premium * bit15) / PRECISION;
        }
        if (fraction & (1 << 15) != 0) {
            premium = (premium * bit16) / PRECISION;
        }
        return premium;
    }

    function supportsInterface(
        bytes4 interfaceID
    ) public view virtual override returns (bool) {
        return super.supportsInterface(interfaceID);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.17 <0.9.0;

interface IPriceOracle {
    struct Price {
        uint256 base;
        uint256 premium;
    }

    /**
     * @dev Returns the price to register or renew a name.
     * @param name The name being registered or renewed.
     * @param expires When the name presently expires (0 if this is a new registration).
     * @param duration How long the name is being registered or extended for, in seconds.
     * @return base premium tuple of base price + premium price
     */
    function price(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view returns (Price calldata);
}

//SPDX-License-Identifier: MIT
pragma solidity ~0.8.17;

import "./IPriceOracle.sol";
import "./StringUtils.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface AggregatorInterface {
    function latestAnswer() external view returns (int256);
}

// StablePriceOracle sets a price in USD, based on an oracle.
contract StablePriceOracle is IPriceOracle {
    using StringUtils for *;

    // Rent in base price units by length
    uint256 public immutable price1Letter;
    uint256 public immutable price2Letter;
    uint256 public immutable price3Letter;
    uint256 public immutable price4Letter;
    uint256 public immutable price5Letter;

    // Oracle address
    AggregatorInterface public immutable usdOracle;

    event RentPriceChanged(uint256[] prices);

    constructor(AggregatorInterface _usdOracle, uint256[] memory _rentPrices) {
        usdOracle = _usdOracle;
        price1Letter = _rentPrices[0];
        price2Letter = _rentPrices[1];
        price3Letter = _rentPrices[2];
        price4Letter = _rentPrices[3];
        price5Letter = _rentPrices[4];
    }

    function price(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view override returns (IPriceOracle.Price memory) {
        uint256 len = name.strlen();
        uint256 basePrice;

        if (len >= 5) {
            basePrice = price5Letter * duration;
        } else if (len == 4) {
            basePrice = price4Letter * duration;
        } else if (len == 3) {
            basePrice = price3Letter * duration;
        } else if (len == 2) {
            basePrice = price2Letter * duration;
        } else {
            basePrice = price1Letter * duration;
        }

        return
            IPriceOracle.Price({
                base: attoUSDToWei(basePrice),
                premium: attoUSDToWei(_premium(name, expires, duration))
            });
    }

    /**
     * @dev Returns the pricing premium in wei.
     */
    function premium(
        string calldata name,
        uint256 expires,
        uint256 duration
    ) external view returns (uint256) {
        return attoUSDToWei(_premium(name, expires, duration));
    }

    /**
     * @dev Returns the pricing premium in internal base units.
     */
    function _premium(
        string memory name,
        uint256 expires,
        uint256 duration
    ) internal view virtual returns (uint256) {
        return 0;
    }

    function attoUSDToWei(uint256 amount) internal view returns (uint256) {
        uint256 ethPrice = uint256(usdOracle.latestAnswer());
        return (amount * 1e8) / ethPrice;
    }

    function weiToAttoUSD(uint256 amount) internal view returns (uint256) {
        uint256 ethPrice = uint256(usdOracle.latestAnswer());
        return (amount * ethPrice) / 1e8;
    }

    function supportsInterface(
        bytes4 interfaceID
    ) public view virtual returns (bool) {
        return
            interfaceID == type(IERC165).interfaceId ||
            interfaceID == type(IPriceOracle).interfaceId;
    }
}

pragma solidity >=0.8.4;

library StringUtils {
    /**
     * @dev Returns the length of a given string
     *
     * @param s The string to measure the length of
     * @return The length of the input string
     */
    function strlen(string memory s) internal pure returns (uint256) {
        uint256 len;
        uint256 i = 0;
        uint256 bytelength = bytes(s).length;
        for (len = 0; i < bytelength; len++) {
            bytes1 b = bytes(s)[i];
            if (b < 0x80) {
                i += 1;
            } else if (b < 0xE0) {
                i += 2;
            } else if (b < 0xF0) {
                i += 3;
            } else if (b < 0xF8) {
                i += 4;
            } else if (b < 0xFC) {
                i += 5;
            } else {
                i += 6;
            }
        }
        return len;
    }
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1300
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"contract AggregatorInterface","name":"_usdOracle","type":"address"},{"internalType":"uint256[]","name":"_rentPrices","type":"uint256[]"},{"internalType":"uint256","name":"_startPremium","type":"uint256"},{"internalType":"uint256","name":"totalDays","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256[]","name":"prices","type":"uint256[]"}],"name":"RentPriceChanged","type":"event"},{"inputs":[{"internalType":"uint256","name":"startPremium","type":"uint256"},{"internalType":"uint256","name":"elapsed","type":"uint256"}],"name":"decayedPremium","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"expires","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"premium","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"expires","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"price","outputs":[{"components":[{"internalType":"uint256","name":"base","type":"uint256"},{"internalType":"uint256","name":"premium","type":"uint256"}],"internalType":"struct IPriceOracle.Price","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price1Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price2Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price3Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price4Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price5Letter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceID","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"usdOracle","outputs":[{"internalType":"contract AggregatorInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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-----Decoded View---------------
Arg [0] : _usdOracle (address): 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
Arg [1] : _rentPrices (uint256[]): 0,0,20294266869609,5073566717402,158548959919
Arg [2] : _startPremium (uint256): 100000000000000000000000000
Arg [3] : totalDays (uint256): 21

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000005f4ec3df9cbd43714fe2740f5e3616155c5b8419
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000015
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000127520915769
Arg [8] : 0000000000000000000000000000000000000000000000000000049d482455da
Arg [9] : 00000000000000000000000000000000000000000000000000000024ea4122af