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/**
 *Submitted for verification at Etherscan.io on 2018-02-19
*/

pragma solidity ^0.4.16;

contract DSMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x);
    }
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x);
    }
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x);
    }

    function min(uint x, uint y) internal pure returns (uint z) {
        return x <= y ? x : y;
    }
    function max(uint x, uint y) internal pure returns (uint z) {
        return x >= y ? x : y;
    }
    function imin(int x, int y) internal pure returns (int z) {
        return x <= y ? x : y;
    }
    function imax(int x, int y) internal pure returns (int z) {
        return x >= y ? x : y;
    }

    uint constant WAD = 10 ** 18;
    uint constant RAY = 10 ** 27;

    function wmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }
    function rmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }
    function wdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, WAD), y / 2) / y;
    }
    function rdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint x, uint n) internal pure returns (uint z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}

contract OtcInterface {
    function sellAllAmount(address, uint, address, uint) public returns (uint);
    function buyAllAmount(address, uint, address, uint) public returns (uint);
    function getPayAmount(address, address, uint) public constant returns (uint);
}

contract TokenInterface {
    function balanceOf(address) public returns (uint);
    function allowance(address, address) public returns (uint);
    function approve(address, uint) public;
    function transfer(address,uint) public returns (bool);
    function transferFrom(address, address, uint) public returns (bool);
    function deposit() public payable;
    function withdraw(uint) public;
}

contract OasisDirectProxy is DSMath {
    function withdrawAndSend(TokenInterface wethToken, uint wethAmt) internal {
        wethToken.withdraw(wethAmt);
        require(msg.sender.call.value(wethAmt)());
    }

    function sellAllAmount(OtcInterface otc, TokenInterface payToken, uint payAmt, TokenInterface buyToken, uint minBuyAmt) public returns (uint buyAmt) {
        require(payToken.transferFrom(msg.sender, this, payAmt));
        if (payToken.allowance(this, otc) < payAmt) {
            payToken.approve(otc, uint(-1));
        }
        buyAmt = otc.sellAllAmount(payToken, payAmt, buyToken, minBuyAmt);
        require(buyToken.transfer(msg.sender, buyAmt));
    }

    function sellAllAmountPayEth(OtcInterface otc, TokenInterface wethToken, TokenInterface buyToken, uint minBuyAmt) public payable returns (uint buyAmt) {
        wethToken.deposit.value(msg.value)();
        if (wethToken.allowance(this, otc) < msg.value) {
            wethToken.approve(otc, uint(-1));
        }
        buyAmt = otc.sellAllAmount(wethToken, msg.value, buyToken, minBuyAmt);
        require(buyToken.transfer(msg.sender, buyAmt));
    }

    function sellAllAmountBuyEth(OtcInterface otc, TokenInterface payToken, uint payAmt, TokenInterface wethToken, uint minBuyAmt) public returns (uint wethAmt) {
        require(payToken.transferFrom(msg.sender, this, payAmt));
        if (payToken.allowance(this, otc) < payAmt) {
            payToken.approve(otc, uint(-1));
        }
        wethAmt = otc.sellAllAmount(payToken, payAmt, wethToken, minBuyAmt);
        withdrawAndSend(wethToken, wethAmt);
    }

    function buyAllAmount(OtcInterface otc, TokenInterface buyToken, uint buyAmt, TokenInterface payToken, uint maxPayAmt) public returns (uint payAmt) {
        uint payAmtNow = otc.getPayAmount(payToken, buyToken, buyAmt);
        require(payAmtNow <= maxPayAmt);
        require(payToken.transferFrom(msg.sender, this, payAmtNow));
        if (payToken.allowance(this, otc) < payAmtNow) {
            payToken.approve(otc, uint(-1));
        }
        payAmt = otc.buyAllAmount(buyToken, buyAmt, payToken, payAmtNow);
        require(buyToken.transfer(msg.sender, min(buyAmt, buyToken.balanceOf(this)))); // To avoid rounding issues we check the minimum value
    }

    function buyAllAmountPayEth(OtcInterface otc, TokenInterface buyToken, uint buyAmt, TokenInterface wethToken) public payable returns (uint wethAmt) {
        // In this case user needs to send more ETH than a estimated value, then contract will send back the rest
        wethToken.deposit.value(msg.value)();
        if (wethToken.allowance(this, otc) < msg.value) {
            wethToken.approve(otc, uint(-1));
        }
        wethAmt = otc.buyAllAmount(buyToken, buyAmt, wethToken, msg.value);
        require(buyToken.transfer(msg.sender, min(buyAmt, buyToken.balanceOf(this)))); // To avoid rounding issues we check the minimum value
        withdrawAndSend(wethToken, sub(msg.value, wethAmt));
    }

    function buyAllAmountBuyEth(OtcInterface otc, TokenInterface wethToken, uint wethAmt, TokenInterface payToken, uint maxPayAmt) public returns (uint payAmt) {
        uint payAmtNow = otc.getPayAmount(payToken, wethToken, wethAmt);
        require(payAmtNow <= maxPayAmt);
        require(payToken.transferFrom(msg.sender, this, payAmtNow));
        if (payToken.allowance(this, otc) < payAmtNow) {
            payToken.approve(otc, uint(-1));
        }
        payAmt = otc.buyAllAmount(wethToken, wethAmt, payToken, payAmtNow);
        withdrawAndSend(wethToken, wethAmt);
    }

    function() public payable {}
}

contract DSAuthority {
    function canCall(
        address src, address dst, bytes4 sig
    ) public view returns (bool);
}

contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

    function DSAuth() public {
        owner = msg.sender;
        LogSetOwner(msg.sender);
    }

    function setOwner(address owner_)
        public
        auth
    {
        owner = owner_;
        LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
        public
        auth
    {
        authority = authority_;
        LogSetAuthority(authority);
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig));
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, this, sig);
        }
    }
}

contract DSNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  guy,
        bytes32  indexed  foo,
        bytes32  indexed  bar,
        uint              wad,
        bytes             fax
    ) anonymous;

    modifier note {
        bytes32 foo;
        bytes32 bar;

        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);

        _;
    }
}

// DSProxy
// Allows code execution using a persistant identity This can be very
// useful to execute a sequence of atomic actions. Since the owner of
// the proxy can be changed, this allows for dynamic ownership models
// i.e. a multisig
contract DSProxy is DSAuth, DSNote {
    DSProxyCache public cache;  // global cache for contracts

    function DSProxy(address _cacheAddr) public {
        require(setCache(_cacheAddr));
    }

    function() public payable {
    }

    // use the proxy to execute calldata _data on contract _code
    function execute(bytes _code, bytes _data)
        public
        payable
        returns (address target, bytes32 response)
    {
        target = cache.read(_code);
        if (target == 0x0) {
            // deploy contract & store its address in cache
            target = cache.write(_code);
        }

        response = execute(target, _data);
    }

    function execute(address _target, bytes _data)
        public
        auth
        note
        payable
        returns (bytes32 response)
    {
        require(_target != 0x0);

        // call contract in current context
        assembly {
            let succeeded := delegatecall(sub(gas, 5000), _target, add(_data, 0x20), mload(_data), 0, 32)
            response := mload(0)      // load delegatecall output
            switch iszero(succeeded)
            case 1 {
                // throw if delegatecall failed
                revert(0, 0)
            }
        }
    }

    //set new cache
    function setCache(address _cacheAddr)
        public
        auth
        note
        returns (bool)
    {
        require(_cacheAddr != 0x0);        // invalid cache address
        cache = DSProxyCache(_cacheAddr);  // overwrite cache
        return true;
    }
}

// DSProxyFactory
// This factory deploys new proxy instances through build()
// Deployed proxy addresses are logged
contract DSProxyFactory {
    event Created(address indexed sender, address proxy, address cache);
    mapping(address=>bool) public isProxy;
    DSProxyCache public cache = new DSProxyCache();

    // deploys a new proxy instance
    // sets owner of proxy to caller
    function build() public returns (DSProxy proxy) {
        proxy = build(msg.sender);
    }

    // deploys a new proxy instance
    // sets custom owner of proxy
    function build(address owner) public returns (DSProxy proxy) {
        proxy = new DSProxy(cache);
        Created(owner, address(proxy), address(cache));
        proxy.setOwner(owner);
        isProxy[proxy] = true;
    }
}

// DSProxyCache
// This global cache stores addresses of contracts previously deployed
// by a proxy. This saves gas from repeat deployment of the same
// contracts and eliminates blockchain bloat.

// By default, all proxies deployed from the same factory store
// contracts in the same cache. The cache a proxy instance uses can be
// changed.  The cache uses the sha3 hash of a contract's bytecode to
// lookup the address
contract DSProxyCache {
    mapping(bytes32 => address) cache;

    function read(bytes _code) public view returns (address) {
        bytes32 hash = keccak256(_code);
        return cache[hash];
    }

    function write(bytes _code) public returns (address target) {
        assembly {
            target := create(0, add(_code, 0x20), mload(_code))
            switch iszero(extcodesize(target))
            case 1 {
                // throw if contract failed to deploy
                revert(0, 0)
            }
        }
        bytes32 hash = keccak256(_code);
        cache[hash] = target;
    }
}

contract ProxyCreationAndExecute is OasisDirectProxy {

    function createAndSellAllAmount(DSProxyFactory factory, OtcInterface otc, TokenInterface payToken, uint payAmt, TokenInterface buyToken, uint minBuyAmt) public returns (DSProxy proxy, uint buyAmt) {
        proxy = factory.build(msg.sender);
        buyAmt = sellAllAmount(otc, payToken, payAmt, buyToken, minBuyAmt);
    }

    function createAndSellAllAmountPayEth(DSProxyFactory factory, OtcInterface otc, TokenInterface wethToken, TokenInterface buyToken, uint minBuyAmt) public payable returns (DSProxy proxy, uint buyAmt) {
        proxy = factory.build(msg.sender);
        buyAmt = sellAllAmountPayEth(otc, wethToken, buyToken, minBuyAmt);
    }

    function createAndSellAllAmountBuyEth(DSProxyFactory factory, OtcInterface otc, TokenInterface payToken, uint payAmt, TokenInterface wethToken, uint minBuyAmt) public returns (DSProxy proxy, uint wethAmt) {
        proxy = factory.build(msg.sender);
        wethAmt = sellAllAmountBuyEth(otc, payToken, payAmt, wethToken, minBuyAmt);
    }

    function createAndBuyAllAmount(DSProxyFactory factory, OtcInterface otc, TokenInterface buyToken, uint buyAmt, TokenInterface payToken, uint maxPayAmt) public returns (DSProxy proxy, uint payAmt) {
        proxy = factory.build(msg.sender);
        payAmt = buyAllAmount(otc, buyToken, buyAmt, payToken, maxPayAmt);
    }

    function createAndBuyAllAmountPayEth(DSProxyFactory factory, OtcInterface otc, TokenInterface buyToken, uint buyAmt, TokenInterface wethToken) public payable returns (DSProxy proxy, uint wethAmt) {
        proxy = factory.build(msg.sender);
        wethAmt = buyAllAmountPayEth(otc, buyToken, buyAmt, wethToken);
    }

    function createAndBuyAllAmountBuyEth(DSProxyFactory factory, OtcInterface otc, TokenInterface wethToken, uint wethAmt, TokenInterface payToken, uint maxPayAmt) public returns (DSProxy proxy, uint payAmt) {
        proxy = factory.build(msg.sender);
        payAmt = buyAllAmountBuyEth(otc, wethToken, wethAmt, payToken, maxPayAmt);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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