pragma solidity ^0.5.5;

/**
 * @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 Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

pragma solidity 0.5.17;


// Compound finance ERC20 market interface
interface CERC20 {
    function mint(uint256 mintAmount) external returns (uint256);

    function redeemUnderlying(uint256 redeemAmount) external returns (uint256);

    function borrow(uint256 borrowAmount) external returns (uint256);

    function repayBorrow(uint256 repayAmount) external returns (uint256);

    function borrowBalanceCurrent(address account) external returns (uint256);

    function exchangeRateCurrent() external returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function balanceOf(address account) external view returns (uint256);

    function decimals() external view returns (uint256);

    function underlying() external view returns (address);

    function exchangeRateStored() external view returns (uint256);
}

pragma solidity ^0.5.0;

/*
 * @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 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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

pragma solidity ^0.5.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

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.
     *
     * 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);
}

pragma solidity 0.5.17;

/**
 * @title The interface for the KyberNetworkProxy smart contract
 */
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";


interface KyberNetworkProxy {
    function getExpectedRate(ERC20 src, ERC20 dest, uint256 srcQty)
        external
        view
        returns (uint256 expectedRate, uint256 slippageRate);

    function tradeWithHint(
        ERC20 src,
        uint256 srcAmount,
        ERC20 dest,
        address payable destAddress,
        uint256 maxDestAmount,
        uint256 minConversionRate,
        address walletId,
        bytes calldata hint
    ) external payable returns (uint256);
}

pragma solidity ^0.5.0;

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

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

pragma solidity 0.5.17;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";
import "./interfaces/CERC20.sol";


contract PooledCDAI is ERC20, Ownable {
    using SafeERC20 for ERC20;
    using SafeMath for uint256;

    uint256 internal constant PRECISION = 10**18;
    uint256 internal constant ERR_CODE_OK = 0;

    CERC20 public constant cDAI = CERC20(
        0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643
    );
    ERC20 public constant dai = ERC20(
        0x6B175474E89094C44Da98b954EedeAC495271d0F
    );

    string private _name;
    string private _symbol;

    struct Beneficiary {
        address dest;
        uint256 weight;
    }
    Beneficiary[] public beneficiaries; // the accounts that will receive the interests from Compound
    uint256 public totalBeneficiaryWeight; // sum of all beneficiary weights
    bool public initialized;

    event Mint(address indexed sender, address indexed to, uint256 amount);
    event Burn(address indexed sender, address indexed to, uint256 amount);
    event WithdrawInterest(address indexed sender, uint256 amount);
    event SetBeneficiaries(address indexed sender);

    /**
     * @dev Sets the values for `name` and `symbol`. Both of
     * these values are immutable: they can only be set once during
     * construction.
     */
    function init(
        string calldata name,
        string calldata symbol,
        Beneficiary[] calldata _beneficiaries
    ) external {
        require(!initialized, "Already initialized");
        initialized = true;

        _name = name;
        _symbol = symbol;

        // Transfer ownership to msg.sender
        _transferOwnership(msg.sender);

        // Set beneficiaries
        uint256 totalWeight = 0;
        for (uint256 i = 0; i < _beneficiaries.length; i = i.add(1)) {
            totalWeight = totalWeight.add(_beneficiaries[i].weight);
            beneficiaries.push(
                Beneficiary({
                    dest: _beneficiaries[i].dest,
                    weight: _beneficiaries[i].weight
                })
            );
        }
        totalBeneficiaryWeight = totalWeight;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public pure returns (uint8) {
        return 18;
    }

    function mint(address to, uint256 amount) external returns (bool) {
        // transfer `amount` DAI from msg.sender
        dai.safeTransferFrom(msg.sender, address(this), amount);

        // use `amount` DAI to mint cDAI
        dai.safeApprove(address(cDAI), amount);
        require(cDAI.mint(amount) == ERR_CODE_OK, "Failed to mint cDAI");

        // mint `amount` pcDAI for `to`
        _mint(to, amount);

        // emit event
        emit Mint(msg.sender, to, amount);

        return true;
    }

    function burn(address to, uint256 amount) external returns (bool) {
        // burn `amount` pcDAI for msg.sender
        _burn(msg.sender, amount);

        // burn cDAI for `amount` DAI
        require(cDAI.redeemUnderlying(amount) == ERR_CODE_OK, "Failed to redeem");

        // transfer DAI to `to`
        dai.safeTransfer(to, amount);

        // emit event
        emit Burn(msg.sender, to, amount);

        return true;
    }

    function accruedInterestCurrent() public returns (uint256) {
        return
            cDAI
                .exchangeRateCurrent()
                .mul(cDAI.balanceOf(address(this)))
                .div(PRECISION)
                .sub(totalSupply());
    }

    function accruedInterestStored() public view returns (uint256) {
        return
            cDAI
                .exchangeRateStored()
                .mul(cDAI.balanceOf(address(this)))
                .div(PRECISION)
                .sub(totalSupply());
    }

    function withdrawInterestInDAI() external returns (bool) {
        // calculate amount of interest in DAI
        uint256 interestAmount = accruedInterestCurrent();

        // burn cDAI
        require(cDAI.redeemUnderlying(interestAmount) == ERR_CODE_OK, "Failed to redeem");

        // transfer DAI to beneficiaries
        uint256 transferAmount = 0;
        for (uint256 i = 0; i < beneficiaries.length; i = i.add(1)) {
            transferAmount = interestAmount.mul(beneficiaries[i].weight).div(
                totalBeneficiaryWeight
            );
            dai.safeTransfer(beneficiaries[i].dest, transferAmount);
        }

        emit WithdrawInterest(msg.sender, interestAmount);

        return true;
    }

    function setBeneficiaries(Beneficiary[] calldata newBeneficiaries)
        external
        onlyOwner
        returns (bool)
    {
        emit SetBeneficiaries(msg.sender);

        delete beneficiaries;
        uint256 newTotalWeight = 0;
        for (uint256 i = 0; i < newBeneficiaries.length; i = i.add(1)) {
            newTotalWeight = newTotalWeight.add(newBeneficiaries[i].weight);
            beneficiaries.push(
                Beneficiary({
                    dest: newBeneficiaries[i].dest,
                    weight: newBeneficiaries[i].weight
                })
            );
        }
        totalBeneficiaryWeight = newTotalWeight;

        return true;
    }
}

pragma solidity 0.5.17;

import "../PooledCDAI.sol";
import "../interfaces/KyberNetworkProxy.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";


/**
  @dev An extension to PooledCDAI that enables minting & burning pcDAI using ETH & ERC20 tokens
    supported by Kyber Network, rather than just DAI. There's no need to deploy one for each pool,
    since it uses pcDAI as a black box.
 */
contract PooledCDAIKyberExtension {
    using SafeERC20 for ERC20;
    using SafeERC20 for PooledCDAI;
    using SafeMath for uint256;

    address public constant DAI_ADDRESS = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
    address public constant KYBER_ADDRESS = 0x818E6FECD516Ecc3849DAf6845e3EC868087B755;
    ERC20 internal constant ETH_TOKEN_ADDRESS = ERC20(
        0x00eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
    );
    bytes internal constant PERM_HINT = "PERM"; // Only use permissioned reserves from Kyber
    uint256 internal constant MAX_QTY = (10**28); // 10B tokens

    function mintWithETH(PooledCDAI pcDAI, address to)
        public
        payable
        returns (bool)
    {
        // convert `msg.value` ETH to DAI
        ERC20 dai = ERC20(DAI_ADDRESS);
        (uint256 actualDAIAmount, uint256 actualETHAmount) = _kyberTrade(
            ETH_TOKEN_ADDRESS,
            msg.value,
            dai
        );

        // mint `actualDAIAmount` pcDAI
        _mint(pcDAI, to, actualDAIAmount);

        // return any leftover ETH
        if (actualETHAmount < msg.value) {
            msg.sender.transfer(msg.value.sub(actualETHAmount));
        }

        return true;
    }

    function mintWithToken(
        PooledCDAI pcDAI,
        address tokenAddress,
        address to,
        uint256 amount
    ) public returns (bool) {
        require(
            tokenAddress != address(ETH_TOKEN_ADDRESS),
            "Use mintWithETH() instead"
        );
        require(tokenAddress != DAI_ADDRESS, "Use mint() instead");

        // transfer `amount` token from msg.sender
        ERC20 token = ERC20(tokenAddress);
        token.safeTransferFrom(msg.sender, address(this), amount);

        // convert `amount` token to DAI
        ERC20 dai = ERC20(DAI_ADDRESS);
        (uint256 actualDAIAmount, uint256 actualTokenAmount) = _kyberTrade(
            token,
            amount,
            dai
        );

        // mint `actualDAIAmount` pcDAI
        _mint(pcDAI, to, actualDAIAmount);

        // return any leftover tokens
        if (actualTokenAmount < amount) {
            token.safeTransfer(msg.sender, amount.sub(actualTokenAmount));
        }

        return true;
    }

    function burnToETH(PooledCDAI pcDAI, address payable to, uint256 amount)
        public
        returns (bool)
    {
        // burn `amount` pcDAI for msg.sender to get DAI
        _burn(pcDAI, amount);

        // convert `amount` DAI to ETH
        ERC20 dai = ERC20(DAI_ADDRESS);
        (uint256 actualETHAmount, uint256 actualDAIAmount) = _kyberTrade(
            dai,
            amount,
            ETH_TOKEN_ADDRESS
        );

        // transfer `actualETHAmount` ETH to `to`
        to.transfer(actualETHAmount);

        // transfer any leftover DAI
        if (actualDAIAmount < amount) {
            dai.safeTransfer(msg.sender, amount.sub(actualDAIAmount));
        }

        return true;
    }

    function burnToToken(
        PooledCDAI pcDAI,
        address tokenAddress,
        address to,
        uint256 amount
    ) public returns (bool) {
        require(
            tokenAddress != address(ETH_TOKEN_ADDRESS),
            "Use burnToETH() instead"
        );
        require(tokenAddress != DAI_ADDRESS, "Use burn() instead");

        // burn `amount` pcDAI for msg.sender to get DAI
        _burn(pcDAI, amount);

        // convert `amount` DAI to token
        ERC20 dai = ERC20(DAI_ADDRESS);
        ERC20 token = ERC20(tokenAddress);
        (uint256 actualTokenAmount, uint256 actualDAIAmount) = _kyberTrade(
            dai,
            amount,
            token
        );

        // transfer `actualTokenAmount` token to `to`
        token.safeTransfer(to, actualTokenAmount);

        // transfer any leftover DAI
        if (actualDAIAmount < amount) {
            dai.safeTransfer(msg.sender, amount.sub(actualDAIAmount));
        }

        return true;
    }

    function _mint(PooledCDAI pcDAI, address to, uint256 actualDAIAmount)
        internal
    {
        ERC20 dai = ERC20(DAI_ADDRESS);
        dai.safeApprove(address(pcDAI), 0);
        dai.safeApprove(address(pcDAI), actualDAIAmount);
        require(pcDAI.mint(to, actualDAIAmount), "Failed to mint pcDAI");
    }

    function _burn(PooledCDAI pcDAI, uint256 amount) internal {
        // transfer `amount` pcDAI from msg.sender
        pcDAI.safeTransferFrom(msg.sender, address(this), amount);

        // burn `amount` pcDAI for DAI
        require(pcDAI.burn(address(this), amount), "Failed to burn pcDAI");
    }

    /**
     * @notice Get the token balance of an account
     * @param _token the token to be queried
     * @param _addr the account whose balance will be returned
     * @return token balance of the account
     */
    function _getBalance(ERC20 _token, address _addr)
        internal
        view
        returns (uint256)
    {
        if (address(_token) == address(ETH_TOKEN_ADDRESS)) {
            return uint256(_addr.balance);
        }
        return uint256(_token.balanceOf(_addr));
    }

    function _toPayableAddr(address _addr)
        internal
        pure
        returns (address payable)
    {
        return address(uint160(_addr));
    }

    /**
     * @notice Wrapper function for doing token conversion on Kyber Network
     * @param _srcToken the token to convert from
     * @param _srcAmount the amount of tokens to be converted
     * @param _destToken the destination token
     * @return _destPriceInSrc the price of the dest token, in terms of source tokens
     *         _srcPriceInDest the price of the source token, in terms of dest tokens
     *         _actualDestAmount actual amount of dest token traded
     *         _actualSrcAmount actual amount of src token traded
     */
    function _kyberTrade(ERC20 _srcToken, uint256 _srcAmount, ERC20 _destToken)
        internal
        returns (uint256 _actualDestAmount, uint256 _actualSrcAmount)
    {
        // Get current rate & ensure token is listed on Kyber
        KyberNetworkProxy kyber = KyberNetworkProxy(KYBER_ADDRESS);
        (, uint256 rate) = kyber.getExpectedRate(
            _srcToken,
            _destToken,
            _srcAmount
        );
        require(rate > 0, "Price for token is 0 on Kyber");

        uint256 beforeSrcBalance = _getBalance(_srcToken, address(this));
        uint256 msgValue;
        if (_srcToken != ETH_TOKEN_ADDRESS) {
            msgValue = 0;
            _srcToken.safeApprove(KYBER_ADDRESS, 0);
            _srcToken.safeApprove(KYBER_ADDRESS, _srcAmount);
        } else {
            msgValue = _srcAmount;
        }
        _actualDestAmount = kyber.tradeWithHint.value(msgValue)(
            _srcToken,
            _srcAmount,
            _destToken,
            _toPayableAddr(address(this)),
            MAX_QTY,
            rate,
            address(0),
            PERM_HINT
        );
        require(_actualDestAmount > 0, "Received 0 dest token");
        if (_srcToken != ETH_TOKEN_ADDRESS) {
            _srcToken.safeApprove(KYBER_ADDRESS, 0);
        }

        _actualSrcAmount = beforeSrcBalance.sub(
            _getBalance(_srcToken, address(this))
        );
    }

    function() external payable {}
}

pragma solidity ^0.5.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @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, "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.

        // 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");
        }
    }
}

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) {
        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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "compilationTarget": {
    "contracts/extensions/PooledCDAIKyberExtension.sol": "PooledCDAIKyberExtension"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}