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/**
 *Submitted for verification at Etherscan.io on 2017-02-28
*/

/*
   Copyright 2016, 2017 Nexus Development, LLC

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

pragma solidity ^0.4.8;

// Token standard API
// https://github.com/ethereum/EIPs/issues/20

contract ERC20 {
    function totalSupply() constant returns (uint supply);
    function balanceOf( address who ) constant returns (uint value);
    function allowance( address owner, address spender ) constant returns (uint _allowance);

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

    event Transfer( address indexed from, address indexed to, uint value);
    event Approval( address indexed owner, address indexed spender, uint value);
}

contract EventfulMarket {
    event ItemUpdate( uint id );
    event Trade( uint sell_how_much, address indexed sell_which_token,
                 uint buy_how_much, address indexed buy_which_token );

    event LogMake(
        bytes32  indexed  id,
        bytes32  indexed  pair,
        address  indexed  maker,
        ERC20             haveToken,
        ERC20             wantToken,
        uint128           haveAmount,
        uint128           wantAmount,
        uint64            timestamp
    );

    event LogTake(
        bytes32           id,
        bytes32  indexed  pair,
        address  indexed  maker,
        ERC20             haveToken,
        ERC20             wantToken,
        address  indexed  taker,
        uint128           takeAmount,
        uint128           giveAmount,
        uint64            timestamp
    );

    event LogKill(
        bytes32  indexed  id,
        bytes32  indexed  pair,
        address  indexed  maker,
        ERC20             haveToken,
        ERC20             wantToken,
        uint128           haveAmount,
        uint128           wantAmount,
        uint64            timestamp
    );
}

contract SimpleMarket is EventfulMarket {
    bool locked;

    modifier synchronized {
        assert(!locked);
        locked = true;
        _;
        locked = false;
    }

    function assert(bool x) internal {
        if (!x) throw;
    }

    struct OfferInfo {
        uint     sell_how_much;
        ERC20    sell_which_token;
        uint     buy_how_much;
        ERC20    buy_which_token;
        address  owner;
        bool     active;
    }

    mapping (uint => OfferInfo) public offers;

    uint public last_offer_id;

    function next_id() internal returns (uint) {
        last_offer_id++; return last_offer_id;
    }

    modifier can_offer {
        _;
    }
    modifier can_buy(uint id) {
        assert(isActive(id));
        _;
    }
    modifier can_cancel(uint id) {
        assert(isActive(id));
        assert(getOwner(id) == msg.sender);
        _;
    }
    function isActive(uint id) constant returns (bool active) {
        return offers[id].active;
    }
    function getOwner(uint id) constant returns (address owner) {
        return offers[id].owner;
    }
    function getOffer( uint id ) constant returns (uint, ERC20, uint, ERC20) {
      var offer = offers[id];
      return (offer.sell_how_much, offer.sell_which_token,
              offer.buy_how_much, offer.buy_which_token);
    }

    // non underflowing subtraction
    function safeSub(uint a, uint b) internal returns (uint) {
        assert(b <= a);
        return a - b;
    }
    // non overflowing multiplication
    function safeMul(uint a, uint b) internal returns (uint c) {
        c = a * b;
        assert(a == 0 || c / a == b);
    }

    function trade( address seller, uint sell_how_much, ERC20 sell_which_token,
                    address buyer,  uint buy_how_much,  ERC20 buy_which_token )
        internal
    {
        var seller_paid_out = buy_which_token.transferFrom( buyer, seller, buy_how_much );
        assert(seller_paid_out);
        var buyer_paid_out = sell_which_token.transfer( buyer, sell_how_much );
        assert(buyer_paid_out);
        Trade( sell_how_much, sell_which_token, buy_how_much, buy_which_token );
    }

    // ---- Public entrypoints ---- //

    function make(
        ERC20    haveToken,
        ERC20    wantToken,
        uint128  haveAmount,
        uint128  wantAmount
    ) returns (bytes32 id) {
        return bytes32(offer(haveAmount, haveToken, wantAmount, wantToken));
    }

    function take(bytes32 id, uint128 maxTakeAmount) {
        assert(buy(uint256(id), maxTakeAmount));
    }

    function kill(bytes32 id) {
        assert(cancel(uint256(id)));
    }

    // Make a new offer. Takes funds from the caller into market escrow.
    function offer( uint sell_how_much, ERC20 sell_which_token
                  , uint buy_how_much,  ERC20 buy_which_token )
        can_offer
        synchronized
        returns (uint id)
    {
        assert(uint128(sell_how_much) == sell_how_much);
        assert(uint128(buy_how_much) == buy_how_much);
        assert(sell_how_much > 0);
        assert(sell_which_token != ERC20(0x0));
        assert(buy_how_much > 0);
        assert(buy_which_token != ERC20(0x0));
        assert(sell_which_token != buy_which_token);

        OfferInfo memory info;
        info.sell_how_much = sell_how_much;
        info.sell_which_token = sell_which_token;
        info.buy_how_much = buy_how_much;
        info.buy_which_token = buy_which_token;
        info.owner = msg.sender;
        info.active = true;
        id = next_id();
        offers[id] = info;

        var seller_paid = sell_which_token.transferFrom( msg.sender, this, sell_how_much );
        assert(seller_paid);

        ItemUpdate(id);
        LogMake(
            bytes32(id),
            sha3(sell_which_token, buy_which_token),
            msg.sender,
            sell_which_token,
            buy_which_token,
            uint128(sell_how_much),
            uint128(buy_how_much),
            uint64(now)
        );
    }

    // Accept given `quantity` of an offer. Transfers funds from caller to
    // offer maker, and from market to caller.
    function buy( uint id, uint quantity )
        can_buy(id)
        synchronized
        returns ( bool success )
    {
        assert(uint128(quantity) == quantity);

        // read-only offer. Modify an offer by directly accessing offers[id]
        OfferInfo memory offer = offers[id];

        // inferred quantity that the buyer wishes to spend
        uint spend = safeMul(quantity, offer.buy_how_much) / offer.sell_how_much;
        assert(uint128(spend) == spend);

        if ( spend > offer.buy_how_much || quantity > offer.sell_how_much ) {
            // buyer wants more than is available
            success = false;
        } else if ( spend == offer.buy_how_much && quantity == offer.sell_how_much ) {
            // buyer wants exactly what is available
            delete offers[id];

            trade( offer.owner, quantity, offer.sell_which_token,
                   msg.sender, spend, offer.buy_which_token );

            ItemUpdate(id);
            LogTake(
                bytes32(id),
                sha3(offer.sell_which_token, offer.buy_which_token),
                offer.owner,
                offer.sell_which_token,
                offer.buy_which_token,
                msg.sender,
                uint128(offer.sell_how_much),
                uint128(offer.buy_how_much),
                uint64(now)
            );

            success = true;
        } else if ( spend > 0 && quantity > 0 ) {
            // buyer wants a fraction of what is available
            offers[id].sell_how_much = safeSub(offer.sell_how_much, quantity);
            offers[id].buy_how_much = safeSub(offer.buy_how_much, spend);

            trade( offer.owner, quantity, offer.sell_which_token,
                    msg.sender, spend, offer.buy_which_token );

            ItemUpdate(id);
            LogTake(
                bytes32(id),
                sha3(offer.sell_which_token, offer.buy_which_token),
                offer.owner,
                offer.sell_which_token,
                offer.buy_which_token,
                msg.sender,
                uint128(quantity),
                uint128(spend),
                uint64(now)
            );

            success = true;
        } else {
            // buyer wants an unsatisfiable amount (less than 1 integer)
            success = false;
        }
    }

    // Cancel an offer. Refunds offer maker.
    function cancel( uint id )
        can_cancel(id)
        synchronized
        returns ( bool success )
    {
        // read-only offer. Modify an offer by directly accessing offers[id]
        OfferInfo memory offer = offers[id];
        delete offers[id];

        var seller_refunded = offer.sell_which_token.transfer( offer.owner , offer.sell_how_much );
        assert(seller_refunded);

        ItemUpdate(id);
        LogKill(
            bytes32(id),
            sha3(offer.sell_which_token, offer.buy_which_token),
            offer.owner,
            offer.sell_which_token,
            offer.buy_which_token,
            uint128(offer.sell_how_much),
            uint128(offer.buy_how_much),
            uint64(now)
        );

        success = true;
    }
}

// Simple Market with a market lifetime. When the lifetime has elapsed,
// offers can only be cancelled (offer and buy will throw).

contract ExpiringMarket is SimpleMarket {
    uint public lifetime;
    uint public close_time;

    function ExpiringMarket(uint lifetime_) {
        lifetime = lifetime_;
        close_time = getTime() + lifetime_;
    }

    function getTime() constant returns (uint) {
        return block.timestamp;
    }
    function isClosed() constant returns (bool closed) {
        return (getTime() > close_time);
    }

    // after market lifetime has elapsed, no new offers are allowed
    modifier can_offer {
        assert(!isClosed());
        _;
    }
    // after close, no new buys are allowed
    modifier can_buy(uint id) {
        assert(isActive(id));
        assert(!isClosed());
        _;
    }
    // after close, anyone can cancel an offer
    modifier can_cancel(uint id) {
        assert(isActive(id));
        assert(isClosed() || (msg.sender == getOwner(id)));
        _;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000000000000000000000000000000000000024ea00

-----Decoded View---------------
Arg [0] : lifetime_ (uint256): 2419200

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000024ea00

bzzr://5ec7419a11f6ad1be3156d3238c3f496e9b29b48ab069676c709c477e8b3c574