Contract 0xbdd5e7d186ec062cc46c0fb52a48f52827baf941 1

pragma solidity = 0.5.16;

import './interfaces/IPolyDexPair.sol';
import './interfaces/IPolyDexFormula.sol';
import './PolyDexERC20.sol';
import './libraries/Math.sol';
import './libraries/UQ112x112.sol';
import './interfaces/IERC20.sol';
import './interfaces/IPolyDexFactory.sol';
import './interfaces/IUniswapV2Callee.sol';

contract PolyDexPair is IPolyDexPair, PolyDexERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10 ** 3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves
    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint private unlocked = 1;
    address public formula;

    uint112 private collectedFee0;           // uses single storage slot, accessible via getReserves
    uint112 private collectedFee1;           // uses single storage slot, accessible via getReserves
    uint32 public swapFee;

    modifier lock() {
        require(unlocked == 1, 'PolyDexV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function getCollectedFees() public view returns (uint112 _collectedFee0, uint112 _collectedFee1) {
        _collectedFee0 = collectedFee0;
        _collectedFee1 = collectedFee1;
    }

    function getTokenWeights() public view returns (uint32 _tokenWeight0, uint32 _tokenWeight1) {
        _tokenWeight0 = 50;
        _tokenWeight1 = 50;
    }

    function getSwapFee() public view returns (uint32 _swapFee) {
        _swapFee = swapFee;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'PolyDexV2: TRANSFER_FAILED');
    }

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1, uint32 _swapFee) external {
        require(msg.sender == factory, 'PolyDexV2: FORBIDDEN');
        // sufficient check
        token0 = _token0;
        token1 = _token1;
        swapFee = _swapFee;
        formula = IPolyDexFactory(factory).formula();
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'Polydex: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IPolyDexFactory(factory).feeTo();
        uint112 protocolFee = uint112(IPolyDexFactory(factory).protocolFee());
        feeOn = feeTo != address(0);
        (uint112 _collectedFee0, uint112 _collectedFee1) = getCollectedFees();
        if (protocolFee > 0 && feeOn && (_collectedFee0 > 0 || _collectedFee1 > 0)) {
            uint liquidity = IPolyDexFormula(formula).mintLiquidityFee(
                totalSupply, _reserve0, _reserve1,
                _collectedFee0 / protocolFee, _collectedFee1 / protocolFee
            );
            if (liquidity > 0) _mint(feeTo, liquidity);
        }
        if (_collectedFee0 > 0) collectedFee0 = 0;
        if (_collectedFee1 > 0) collectedFee1 = 0;
    }
    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);
        _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply;
        // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY);
            // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'PolyDexV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];
        _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply;// using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply;// using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'PolyDexV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Burn(msg.sender, amount0, amount1, to);
    }
    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'PolyDexV2: INSUFFICIENT_OUTPUT_AMOUNT');
        uint112 _reserve0 = reserve0; // gas savings
        uint112 _reserve1 = reserve1; // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'PolyDexV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'PolyDexV2: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'PolyDexV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint balance0Adjusted = balance0.mul(10000);
            uint balance1Adjusted = balance1.mul(10000);
            { // avoids stack too deep errors
                if (amount0In > 0) {
                    uint amount0InFee = amount0In.mul(swapFee);
                    balance0Adjusted = balance0Adjusted.sub(amount0InFee);
                    collectedFee0 = uint112(uint(collectedFee0).add(amount0InFee));
                }
                if (amount1In > 0) {
                    uint amount1InFee = amount1In.mul(swapFee);
                    balance1Adjusted = balance1Adjusted.sub(amount1InFee);
                    collectedFee1 = uint112(uint(collectedFee1).add(amount1InFee));
                }
                require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(10000**2), 'PolyDexV2: K');
            }
        }
        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

pragma solidity >=0.5.16;
interface IPolyDexPair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;


    event PaidProtocolFee(uint112 collectedFee0, uint112 collectedFee1);
    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function getCollectedFees() external view returns (uint112 _collectedFee0, uint112 _collectedFee1);
    function getTokenWeights() external view returns (uint32 tokenWeight0, uint32 tokenWeight1);
    function getSwapFee() external view returns (uint32);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address, uint32) external;
}

// SPDX-License-Identifier: SEE LICENSE IN LICENSE
pragma solidity >=0.5.16;

/*
    Bancor Formula interface
*/
interface IPolyDexFormula {

    function getReserveAndWeights(address pair, address tokenA) external view returns (
        address tokenB,
        uint reserveA,
        uint reserveB,
        uint32 tokenWeightA,
        uint32 tokenWeightB,
        uint32 swapFee
    );

    function getFactoryReserveAndWeights(address factory, address pair, address tokenA) external view returns (
        address tokenB,
        uint reserveA,
        uint reserveB,
        uint32 tokenWeightA,
        uint32 tokenWeightB,
        uint32 swapFee
    );

    function getAmountIn(
        uint amountOut,
        uint reserveIn, uint reserveOut,
        uint32 tokenWeightIn, uint32 tokenWeightOut,
        uint32 swapFee
    ) external view returns (uint amountIn);

    function getPairAmountIn(address pair, address tokenIn, uint amountOut) external view returns (uint amountIn);

    function getAmountOut(
        uint amountIn,
        uint reserveIn, uint reserveOut,
        uint32 tokenWeightIn, uint32 tokenWeightOut,
        uint32 swapFee
    ) external view returns (uint amountOut);

    function getPairAmountOut(address pair, address tokenIn, uint amountIn) external view returns (uint amountOut);

    function getAmountsIn(
        address tokenIn,
        address tokenOut,
        uint amountOut,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function getFactoryAmountsIn(
        address factory,
        address tokenIn,
        address tokenOut,
        uint amountOut,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function getAmountsOut(
        address tokenIn,
        address tokenOut,
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function getFactoryAmountsOut(
        address factory,
        address tokenIn,
        address tokenOut,
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function ensureConstantValue(uint reserve0, uint reserve1, uint balance0Adjusted, uint balance1Adjusted, uint32 tokenWeight0) external view returns (bool);
    function getReserves(address pair, address tokenA, address tokenB) external view returns (uint reserveA, uint reserveB);
    function getOtherToken(address pair, address tokenA) external view returns (address tokenB);
    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function sortTokens(address tokenA, address tokenB) external pure returns (address token0, address token1);
    function mintLiquidityFee(
        uint totalLiquidity,
        uint112 reserve0,
        uint112  reserve1,
        uint112  collectedFee0,
        uint112 collectedFee1) external view returns (uint amount);
}

pragma solidity =0.5.16;

import './interfaces/IPolyDexERC20.sol';
import './libraries/SafeMath.sol';

contract PolyDexERC20 is IPolyDexERC20 {
    using SafeMath for uint;

    string public constant name = 'PolyDexV2 Liquidity Provider';
    string public constant symbol = 'PolyDexV2-LP';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    constructor() public {
        uint chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'PolyDexV2: EXPIRED');
        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, 'PolyDexV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

pragma solidity >=0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

pragma solidity >=0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

pragma solidity >=0.5.16;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

pragma solidity >=0.5.16;

interface IPolyDexFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint32 swapFee, uint);
    function feeTo() external view returns (address);
    function formula() external view returns (address);
    function protocolFee() external view returns (uint);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function isPair(address) external view returns (bool);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);
    function getWeightsAndSwapFee(address pair) external view returns (uint32 tokenWeight0, uint32 tokenWeight1, uint32 swapFee);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setProtocolFee(uint) external;
}

pragma solidity >=0.5.16;

interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

pragma solidity >=0.5.16;

interface IPolyDexERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

pragma solidity >=0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
    function div(uint a, uint b) internal pure returns (uint c) {
        require(b > 0, 'ds-math-division-by-zero');
        c = a / b;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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