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Outline

• interface PriceOracle
•    - function price(string calldata name, ...
• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
• library StringUtils
•    - function strlen(string memory s)
•  contract Ownable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface DSValue
•    - function read()
•  contract StablePriceOracle is Owna ... *
•    - function setOracle(DSValue _usdOracle ...
•    - function setPrices(uint[] memory _ren ...
•    - function price(string calldata name, ...

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/**
 *Submitted for verification at Etherscan.io on 2019-04-30
*/

// File: contracts/PriceOracle.sol

pragma solidity >=0.4.24;

interface PriceOracle {
    /**
     * @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 The price of this renewal or registration, in wei.
     */
    function price(string calldata name, uint expires, uint duration) external view returns(uint);
}

// File: contracts/SafeMath.sol

pragma solidity >=0.4.24;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
    * @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
    * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
    * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
    * @dev Adds two unsigned integers, reverts on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
    * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
    * reverts when dividing by zero.
    */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

// File: contracts/StringUtils.sol

pragma solidity >=0.4.24;

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 (uint) {
        uint len;
        uint i = 0;
        uint bytelength = bytes(s).length;
        for(len = 0; i < bytelength; len++) {
            byte 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;
    }
}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

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

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

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @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) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/StablePriceOracle.sol

pragma solidity ^0.5.0;





interface DSValue {
    function read() external view returns (bytes32);
}

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

    // Oracle address
    DSValue usdOracle;

    // Rent in attodollars (1e-18) per second
    uint[] public rentPrices;

    event OracleChanged(address oracle);
    event RentPriceChanged(uint[] prices);

    constructor(DSValue _usdOracle, uint[] memory _rentPrices) public {
        setOracle(_usdOracle);
        setPrices(_rentPrices);
    }

    /**
     * @dev Sets the price oracle address
     * @param _usdOracle The address of the price oracle to use.
     */
    function setOracle(DSValue _usdOracle) public onlyOwner {
        usdOracle = _usdOracle;
        emit OracleChanged(address(_usdOracle));
    }

    /**
     * @dev Sets rent prices.
     * @param _rentPrices The price array. Each element corresponds to a specific
     *                    name length; names longer than the length of the array
     *                    default to the price of the last element.
     */
    function setPrices(uint[] memory _rentPrices) public onlyOwner {
        rentPrices = _rentPrices;
        emit RentPriceChanged(_rentPrices);
    }

    /**
     * @dev Returns the price to register or renew a name.
     * @param name The name being registered or renewed.
     * @param duration How long the name is being registered or extended for, in seconds.
     * @return The price of this renewal or registration, in wei.
     */
    function price(string calldata name, uint /*expires*/, uint duration) view external returns(uint) {
        uint len = name.strlen();
        if(len > rentPrices.length) {
            len = rentPrices.length;
        }
        require(len > 0);
        uint priceUSD = rentPrices[len - 1].mul(duration);

        // Price of one ether in attodollars
        uint ethPrice = uint(usdOracle.read());

        // priceUSD and ethPrice are both fixed-point values with 18dp, so we
        // multiply the numerator by 1e18 before dividing.
        return priceUSD.mul(1e18).div(ethPrice);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000729d19f657bd0614b4985cf1d82531c67569197b000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001275209157690000000000000000000000000000000000000000000000000000049d482455da00000000000000000000000000000000000000000000000000000024ea4122af

-----Decoded View---------------
Arg [0] : _usdOracle (address): 0x729D19f657BD0614b4985Cf1D82531c67569197B
Arg [1] : _rentPrices (uint256[]): 0,0,20294266869609,5073566717402,158548959919

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000729d19f657bd0614b4985cf1d82531c67569197b
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000127520915769
Arg [6] : 0000000000000000000000000000000000000000000000000000049d482455da
Arg [7] : 00000000000000000000000000000000000000000000000000000024ea4122af

bzzr://a24b96a32610bcf56d1a4eb9d9e90d7e91f815bb29597ef504a3735c896fcd23