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• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library Address
•    - function isContract(address account)
• interface IExchange
•    - function swap(
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function callOptionalReturn(IERC20 to ...
• interface ITokenTransferProxy
•    - function transferFrom(
•    - function freeGSTTokens(uint256 tokens ...
• library Utils
•    - function ethAddress()
•    - function maxUint()
•    - function approve(
•    - function transferTokens(
•    - function tokenBalance(
•    - function refundGas(address tokenProxy ...
•    - function freeGasTokens(address tokenP ...
• interface IUniswapExchange
•    - function ethToTokenSwapInput(
•    - function tokenToEthSwapInput(
•    - function tokenToTokenSwapInput(
•    - function ethToTokenTransferInput(
•    - function ethToTokenTransferOutput(
•    - function tokenToEthTransferInput(
•    - function tokenToEthTransferOutput(
•    - function tokenToTokenTransferInput(
•    - function tokenToTokenTransferOutput(
• interface IUniswapFactory
•    - function getExchange(address token)
•  contract Ownable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
•  contract TokenFetcher is Ownable
•    - function transferTokens(
•  contract Uniswap is IExchange, Tok ... *
•    - function()
•    - function swap(
•    - function getExchange(IERC20 fromToken ...

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/**
 *Submitted for verification at Etherscan.io on 2020-05-23
*/

// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
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.
     *
     * > 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: openzeppelin-solidity/contracts/utils/Address.sol

pragma solidity ^0.5.0;

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

// File: original_contracts/lib/IExchange.sol

pragma solidity 0.5.11;



/**
* @dev This interface should be implemented by all exchanges which needs to integrate with the paraswap protocol
*/
interface IExchange {

    /**
   * @dev The function which performs the swap on an exchange.
   * Exchange needs to implement this method in order to support swapping of tokens through it
   * @param fromToken Address of the source token
   * @param toToken Address of the destination token
   * @param fromAmount Amount of source tokens to be swapped
   * @param toAmount Minimum destination token amount expected out of this swap
   * @param exchange Internal exchange or factory contract address for the exchange. For example Registry address for the Uniswap
   * @param payload Any exchange specific data which is required can be passed in this argument in encoded format which
   * will be decoded by the exchange. Each exchange will publish it's own decoding/encoding mechanism
   */
    function swap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address exchange,
        bytes calldata payload) external payable returns (uint256);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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-solidity/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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol

pragma solidity ^0.5.0;




/**
 * @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 ERC20;` 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));
    }

    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);
        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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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: original_contracts/ITokenTransferProxy.sol

pragma solidity 0.5.11;


interface ITokenTransferProxy {

    function transferFrom(
        address token,
        address from,
        address to,
        uint256 amount
    )
        external;

    function freeGSTTokens(uint256 tokensToFree) external;
}

// File: original_contracts/lib/Utils.sol

pragma solidity 0.5.11;







library Utils {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    address constant ETH_ADDRESS = address(
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
    );

    uint256 constant MAX_UINT = 2 ** 256 - 1;

    struct Route {
        address payable exchange;
        address targetExchange;
        uint percent;
        bytes payload;
        uint256 networkFee;
    }

    struct Path {
        address to;
        Route[] routes;
    }

    function ethAddress() internal pure returns (address) {return ETH_ADDRESS;}

    function maxUint() internal pure returns (uint256) {return MAX_UINT;}

    function approve(
        address addressToApprove,
        address token
    ) internal {
        if (token != ETH_ADDRESS) {
            IERC20 _token = IERC20(token);

            uint allowance = _token.allowance(address(this), addressToApprove);

            if (allowance < MAX_UINT / 10) {
                _token.safeApprove(addressToApprove, MAX_UINT);
            }
        }
    }

    function transferTokens(
        address token,
        address payable destination,
        uint256 amount
    )
    internal
    {
        if (token == ETH_ADDRESS) {
            destination.transfer(amount);
        }
        else {
            IERC20(token).safeTransfer(destination, amount);
        }
    }

    function tokenBalance(
        address token,
        address account
    )
    internal
    view
    returns (uint256)
    {
        if (token == ETH_ADDRESS) {
            return account.balance;
        } else {
            return IERC20(token).balanceOf(account);
        }
    }

    /**
    * @dev Helper method to refund gas using gas tokens
    */
    function refundGas(address tokenProxy, uint256 initialGas, uint256 mintPrice) internal {

        uint256 mintBase = 32254;
        uint256 mintToken = 36543;
        uint256 freeBase = 14154;
        uint256 freeToken = 6870;
        uint256 reimburse = 24000;

        uint256 tokens = initialGas.sub(
            gasleft()).add(freeBase).div(reimburse.mul(2).sub(freeToken)
        );

        uint256 mintCost = mintBase.add(tokens.mul(mintToken));
        uint256 freeCost = freeBase.add(tokens.mul(freeToken));
        uint256 maxreimburse = tokens.mul(reimburse);

        uint256 efficiency = maxreimburse.mul(tx.gasprice).mul(100).div(
            mintCost.mul(mintPrice).add(freeCost.mul(tx.gasprice))
        );

        if (efficiency > 100) {
            freeGasTokens(tokenProxy, tokens);
        }
    }
    
    /**
    * @dev Helper method to free gas tokens
    */
    function freeGasTokens(address tokenProxy, uint256 tokens) internal {

        uint256 tokensToFree = tokens;
        uint256 safeNumTokens = 0;
        uint256 gas = gasleft();

        if (gas >= 27710) {
            safeNumTokens = gas.sub(27710).div(1148 + 5722 + 150);
        }

        if (tokensToFree > safeNumTokens) {
            tokensToFree = safeNumTokens;
        }

        ITokenTransferProxy(tokenProxy).freeGSTTokens(tokensToFree);

    }
}

// File: original_contracts/lib/uniswap/IUniswapExchange.sol

pragma solidity 0.5.11;

interface IUniswapExchange {
    function ethToTokenSwapInput(
        uint256 minTokens,
        uint256 deadline) external payable returns (uint256 tokensBought);

    function tokenToEthSwapInput(
        uint256 tokensSold,
        uint256 minEth,
        uint256 deadline) external returns (uint256 ethBought);

    function tokenToTokenSwapInput(
        uint256 tokensSold,
        uint256 minTokensBought,
        uint256 minEthBought,
        uint256 deadline,
        address tokenAddr
    ) external returns (uint256 tokensBought);

    function ethToTokenTransferInput(
        uint256 min_tokens,
        uint256 deadline,
        address recipient
    ) external payable returns (uint256 tokens_bought);

    function ethToTokenTransferOutput(
        uint256 tokens_bought,
        uint256 deadline,
        address recipient
    ) external payable returns (uint256 eth_sold);

    function tokenToEthTransferInput(
        uint256 tokens_sold,
        uint256 min_tokens,
        uint256 deadline,
        address recipient
    ) external returns (uint256 eth_bought);

    function tokenToEthTransferOutput(
        uint256 eth_bought,
        uint256 max_tokens,
        uint256 deadline,
        address recipient
    ) external returns (uint256 tokens_sold);

    function tokenToTokenTransferInput(
        uint256 tokens_sold,
        uint256 min_tokens_bought,
        uint256 min_eth_bought,
        uint256 deadline,
        address recipient,
        address token_addr
    ) external returns (uint256 tokens_bought);

    function tokenToTokenTransferOutput(
        uint256 tokens_bought,
        uint256 max_tokens_sold,
        uint256 max_eth_sold,
        uint256 deadline,
        address recipient,
        address token_addr
    ) external returns (uint256 tokens_sold);
}

// File: original_contracts/lib/uniswap/IUniswapFactory.sol

pragma solidity 0.5.11;


interface IUniswapFactory {
    function getExchange(address token) external view returns (address exchange);
}

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

pragma solidity ^0.5.0;

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @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(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: original_contracts/lib/TokenFetcher.sol

pragma solidity 0.5.11;




contract TokenFetcher is Ownable {

    /**
    * @dev Allows owner of the contract to transfer tokens any tokens which are assigned to the contract
    * This method is for saftey if by any chance tokens or ETHs are assigned to the contract by mistake
    * @dev token Address of the token to be transferred
    * @dev destination Recepient of the token
    * @dev amount Amount of tokens to be transferred
    */
    function transferTokens(
        address token,
        address payable destination,
        uint256 amount
    )
        external
        onlyOwner
    {
        Utils.transferTokens(token, destination, amount);
    }
}

// File: original_contracts/lib/uniswap/Uniswap.sol

pragma solidity 0.5.11;









contract Uniswap is IExchange, TokenFetcher {
    using SafeMath for uint256;
    using Address for address;

    /**
    * @dev Fallback method to allow exchanges to transfer back ethers for a particular swap
    * It will only allow contracts to send funds to it
    */
    function() external payable {
        address account = msg.sender;
        require(
            account.isContract(),
            "Sender is not a contract"
        );
    }

    function swap(
        IERC20 fromToken,
        IERC20 toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address factoryAddress,
        bytes calldata payload) external payable returns (uint256) {

        address exchange = getExchange(fromToken, toToken, factoryAddress);

        Utils.approve(address(exchange), address(fromToken));

        uint256 receivedAmount = 0;

        if (address(fromToken) == Utils.ethAddress()) {
            receivedAmount = IUniswapExchange(exchange).ethToTokenSwapInput.value(fromAmount)(toAmount, now);
        }
        else if (address(toToken) == Utils.ethAddress()) {
            receivedAmount = IUniswapExchange(exchange).tokenToEthSwapInput(fromAmount, toAmount, now);
        }
        else {
            receivedAmount = IUniswapExchange(exchange).tokenToTokenSwapInput(fromAmount, toAmount, 1, now, address(toToken));
        }

        Utils.transferTokens(address(toToken), msg.sender, receivedAmount);

        return receivedAmount;
    }

    function getExchange(IERC20 fromToken, IERC20 toToken, address factoryAddress) private view returns (address) {
        address exchangeAddress = address(fromToken) == Utils.ethAddress() ? address(toToken) : address(fromToken);

        return IUniswapFactory(factoryAddress).getExchange(exchangeAddress);
    }
}

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