Token

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library SafeMath    - function add(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b, st ...    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function div(uint256 a, uint256 b, st ...    - function mod(uint256 a, uint256 b)    - function mod(uint256 a, uint256 b, st ...    - function _msgSender()    - function _msgData()  contract Ownable is Context    - function owner()    - function renounceOwnership()    - function transferOwnership(address ne ...  contract Token is Ownable *    - function name()    - function symbol()    - function decimals()    - function totalSupply()    - function balanceOf(address account)    - function transfer(address recipient, ...    - function allowance(address owner, add ...    - function approve(address spender, uin ...    - function transferFrom(    - function rebaseInvoker()    - function perShareAmount()    - function totalShares()    - function changeRebaseInvoker(address ...    - function rebase(

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/**
 *Submitted for verification at Etherscan.io on 2020-08-30
*/

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.8.0;

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



/**
 * @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/GSN/Context.sol



/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

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

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

// File: src/Token.sol




contract Token is Ownable {
    using SafeMath for uint256;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    address private _rebaseInvoker;
    uint256 private _perShareAmount;
    uint256 private _totalShares;

    mapping(address => uint256) private _shares;
    mapping(address => mapping(address => uint256)) private _allowedShares;

    modifier onlyRebaseInvoker() {
        require(
            msg.sender == _rebaseInvoker,
            "Rebase: caller is not the rebase invoker"
        );
        _;
    }

    constructor() public {
        _perShareAmount = 10**9;
        _totalShares = 10000000 * 10**9;
        _name = "Elastic";
        _symbol = "ESC";
        _decimals = 18;

        address msgSender = _msgSender();
        _shares[msgSender] = _totalShares;
        emit Transfer(address(0), msgSender, _totalShares.mul(_perShareAmount));
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view returns (uint256) {
        return _totalShares.mul(_perShareAmount);
    }

    function balanceOf(address account) external view returns (uint256) {
        return _shares[account].mul(_perShareAmount);
    }

    function transfer(address recipient, uint256 amount)
        external
        returns (bool)
    {
        uint256 share = amount.div(_perShareAmount);
        _shares[msg.sender] = _shares[msg.sender].sub(share);
        _shares[recipient] = _shares[recipient].add(share);
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        external
        view
        returns (uint256)
    {
        return _allowedShares[owner][spender].mul(_perShareAmount);
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        _allowedShares[msg.sender][spender] = amount.div(_perShareAmount);
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool) {
        uint256 share = amount.div(_perShareAmount);
        _allowedShares[sender][msg.sender] = _allowedShares[sender][msg.sender]
            .sub(share);
        _shares[sender] = _shares[sender].sub(share);
        _shares[recipient] = _shares[recipient].add(share);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function rebaseInvoker() public view returns (address) {
        return _rebaseInvoker;
    }

    function perShareAmount() public view returns (uint256) {
        return _perShareAmount;
    }

    function totalShares() public view returns (uint256) {
        return _totalShares;
    }

    function changeRebaseInvoker(address newInvoker) public onlyOwner {
        require(
            newInvoker != address(0),
            "Rebase: new invoker is the zero address"
        );
        emit RebaseInvokerChanged(_rebaseInvoker, newInvoker);
        _rebaseInvoker = newInvoker;
    }

    function rebase(
        uint256 epoch,
        uint256 numerator,
        uint256 denominator
    ) external onlyRebaseInvoker returns (uint256) {
        uint256 newPerShareAmount = _perShareAmount.mul(numerator).div(
            denominator
        );
        emit Rebase(epoch, _perShareAmount, newPerShareAmount);
        _perShareAmount = newPerShareAmount;
        return _perShareAmount;
    }

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 amount
    );

    event Rebase(
        uint256 indexed epoch,
        uint256 oldPerShareAmount,
        uint256 newPerShareAmount
    );

    event RebaseInvokerChanged(
        address indexed previousOwner,
        address indexed newOwner
    );
}

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