mpolci · July 10, 2016 07:29 · Jul 5, 2016
diff --git a/escrow_goods.sol b/escrow_goods.sol
@@ -0,0 +1,316 @@
+/* A contract to store goods with escrowed funds. */
+
+/* Deployment:
+Owner: seller
+Last address: dynamic
+ABI: [{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"escrows","outputs":[{"name":"buyer","type":"address"},{"name":"lockedFunds","type":"uint256"},{"name":"frozenTime","type":"uint256"},{"name":"frozenFunds","type":"uint256"},{"name":"buyerNo","type":"uint256"},{"name":"sellerNo","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"count","outputs":[{"name":"","type":"uint16"}],"type":"function"},{"constant":false,"inputs":[{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"}],"name":"cancel","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"seller","outputs":[{"name":"","type":"address"}],"type":"function"},{"constant":true,"inputs":[],"name":"freezePeriod","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"},{"name":"_count","type":"uint16"}],"name":"buy","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"status","outputs":[{"name":"","type":"uint16"}],"type":"function"},{"constant":true,"inputs":[],"name":"rewardPromille","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"}],"name":"getMoney","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"}],"name":"no","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"},{"name":"_count","type":"uint16"},{"name":"recipient","type":"address"},{"name":"amount","type":"uint256"}],"name":"reject","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"totalEscrows","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"who","type":"address"},{"name":"payment","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"}],"name":"arbYes","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"feeFunds","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"}],"name":"yes","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"buyers","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"availableCount","outputs":[{"name":"","type":"uint16"}],"type":"function"},{"constant":true,"inputs":[],"name":"price","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"datainfo","type":"string"},{"name":"_version","type":"uint256"},{"name":"_count","type":"uint16"}],"name":"accept","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"unbuy","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"getFees","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"feePromille","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"activityTime","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"pendingCount","outputs":[{"name":"","type":"uint16"}],"type":"function"},{"constant":true,"inputs":[],"name":"arbiter","outputs":[{"name":"","type":"address"}],"type":"function"},{"inputs":[{"name":"_arbiter","type":"address"},{"name":"_freezePeriod","type":"uint256"},{"name":"_feePromille","type":"uint256"},{"name":"_rewardPromille","type":"uint256"},{"name":"_count","type":"uint16"},{"name":"_price","type":"uint256"}],"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"message","type":"string"}],"name":"log_event","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"lockid","type":"uint256"},{"indexed":false,"name":"datainfo","type":"string"},{"indexed":true,"name":"version","type":"uint256"},{"indexed":false,"name":"datatype","type":"uint256"},{"indexed":true,"name":"sender","type":"address"},{"indexed":false,"name":"count","type":"uint256"},{"indexed":false,"name":"payment","type":"uint256"}],"name":"content","type":"event"}]
+Optimized: yes
+Solidity version: v0.3.5-2016-06-14-371690f
+*/
+
+contract escrow_goods {
+
+    //seller/owner of the goods
+    address public seller;
+
+    //escrow related
+
+    struct EscrowInfo {
+        address buyer;
+        uint lockedFunds;
+        uint frozenTime;
+        uint frozenFunds;
+        uint buyerNo;
+        uint sellerNo;
+    }
+
+    address public arbiter;
+
+    uint public freezePeriod;
+    //each lock fee in promilles.
+    uint public feePromille;
+    //reward in promilles. promille = percent * 10, eg 1,5% reward = 15 rewardPromille
+    uint public rewardPromille;
+    uint constant arbitragePeriod = 30 days;
+    uint constant stalePeriod = 180 days;
+
+    uint public activityTime;
+    uint public feeFunds;
+    uint public totalEscrows;
+
+    mapping (uint => EscrowInfo) public escrows;
+
+    //goods related
+
+    //status of the goods: Available, Pending, Sold, Canceled
+    uint16 public status;
+    //how many for sale
+    uint16 public count;
+    //price per item
+    uint public price;
+
+    uint16 public availableCount;
+    uint16 public pendingCount;
+
+    mapping (address => uint) public buyers;
+
+    event log_event(string message);
+    event content(uint indexed lockid, string datainfo, uint indexed version, uint datatype, address indexed sender, uint count, uint payment);
+    modifier onlyowner { if (msg.sender == seller) _ } 
+
+    function escrow_goods(address _arbiter, uint _freezePeriod, uint _feePromille, uint _rewardPromille,
+                          uint16 _count, uint _price) {
+
+        seller = msg.sender;
+
+        //escrow related
+        arbiter = _arbiter;
+        freezePeriod = _freezePeriod;
+        feePromille = _feePromille;
+        rewardPromille = _rewardPromille;
+
+        activityTime = now;
+        feeFunds = 0;
+        totalEscrows = 0;
+
+        //goods related
+        //status = Available
+        status = 1;
+        count = _count;
+        price = _price;
+
+        availableCount = count;
+        pendingCount = 0;
+    }
+
+    function kill() {
+        //allow anyone to claim dead contract funds
+        if(now > (activityTime + stalePeriod)) {
+           suicide(msg.sender);
+           return;
+        }
+
+        //do not allow killing contract with active escrows
+        if(totalEscrows > 0) return;
+        //do not allow killing contract with unclaimed escrow fees
+        if(feeFunds > 0) return;
+        if(msg.sender != seller) return;
+        suicide(seller);
+    }
+
+    function log(string message) private {
+        log_event(message);
+    }
+
+    //escrow API
+
+    //vote YES - immediately sends funds to the peer
+    function yes(uint id, string datainfo, uint _version) {
+
+        EscrowInfo info = escrows[id];
+
+        if(info.lockedFunds == 0) return;
+        if(msg.sender != info.buyer && msg.sender != seller) return;
+
+        uint payment = info.lockedFunds;
+        if(payment > this.balance) payment = this.balance;
+        if(totalEscrows > 0) totalEscrows -= 1;
+        info.lockedFunds = 0;
+
+        if(msg.sender == info.buyer) {
+            //send funds to seller
+            seller.send(payment);
+        }
+
+        if(msg.sender == seller) {
+            //send funds to buyer
+            info.buyer.send(payment);
+        }
+
+        content(id, datainfo, _version, 11, msg.sender, 0, payment);
+    }
+
+    //vote NO - freeze funds for arbitrage
+    function no(uint id, string datainfo, uint _version) {
+
+        EscrowInfo info = escrows[id];
+
+        if(info.lockedFunds == 0) return;
+        if(msg.sender != info.buyer && msg.sender != seller) return;
+
+        //freeze funds
+        //only allow one time freeze
+        if(info.frozenFunds == 0) {
+            info.frozenFunds = info.lockedFunds;
+            info.frozenTime = now;
+        }
+
+        if(msg.sender == info.buyer) {
+            info.buyerNo = 1;
+        }
+
+        if(msg.sender == seller) {
+            info.sellerNo = 1;
+        }
+
+        content(id, datainfo, _version, 12, msg.sender, 0, info.lockedFunds);
+    }
+
+    //arbiter's decision on the case.
+    //arbiter can only decide when both buyer and seller voted NO
+    //arbiter decides on his own reward but not bigger than announced percentage (rewardPromille)
+    function arbYes(uint id, address who, uint payment, string datainfo, uint _version) {
+        if(msg.sender != arbiter) return;
+
+        EscrowInfo info = escrows[id];
+
+        if(info.lockedFunds == 0) return;
+        if(info.frozenFunds == 0) return;
+
+        if(who != seller && who != info.buyer) return;
+        //requires both NO to arbitrage
+        if(info.buyerNo == 0 || info.sellerNo == 0) return;
+
+        if(info.lockedFunds > this.balance) info.lockedFunds = this.balance;
+        if(payment > info.lockedFunds) payment = info.lockedFunds;
+
+        //limit payment
+        uint reward = (info.lockedFunds * rewardPromille) / 1000;
+        if(reward > (info.lockedFunds - payment)) {
+            log("Reward exceeds reward limit");
+            return;
+        }
+
+        //send funds to the winner
+        who.send(payment);
+
+        //send the rest as reward
+        info.lockedFunds -= payment;
+        feeFunds += info.lockedFunds;
+
+        info.lockedFunds = 0;
+        content(id, datainfo, _version, 13, msg.sender, 0, payment);
+    }
+
+    //allow arbiter to get his collected fees
+    function getFees() {
+        if(msg.sender != arbiter) return;
+        if(feeFunds > this.balance) feeFunds = this.balance;
+        arbiter.send(feeFunds);
+        feeFunds = 0;
+    }
+
+    //allow buyer or seller take timeouted funds.
+    //buyer can get funds if seller is silent and seller can get funds if buyer is silent (after freezePeriod)
+    //buyer can get back funds under arbitrage if arbiter is silent (after arbitragePeriod)
+    function getMoney(uint id) {
+
+        EscrowInfo info = escrows[id];
+
+        if(info.lockedFunds == 0) return;
+        //HACK: this check is necessary since frozenTime == 0 at escrow creation
+        if(info.frozenFunds == 0) return;
+
+        //timout for voting not over yet
+        if(now < (info.frozenTime + freezePeriod)) return;
+
+        uint payment = info.lockedFunds;
+        if(payment > this.balance) payment = this.balance;
+        //both has voted - money is under arbitrage
+        if(info.buyerNo != 0 && info.sellerNo != 0) {
+            //arbitrage timeout is not over yet
+            if(now < (info.frozenTime + freezePeriod + arbitragePeriod)) return;
+
+            //arbiter was silent so redeem the funds to the buyer
+            info.buyer.send(payment);
+            info.lockedFunds = 0;
+            return;
+        }
+
+        if(info.buyerNo != 0) {
+            info.buyer.send(payment);
+            info.lockedFunds = 0;
+            return;
+        }
+        if(info.sellerNo != 0) {
+            seller.send(payment);
+            info.lockedFunds = 0;
+            return;
+        }
+    }
+
+    //goods API
+
+    //buy with escrow. id - escrow info id
+    function buy(uint id, string datainfo, uint _version, uint16 _count) {
+        if(status != 1) { log("status != 1"); throw; }
+        if(msg.value < (price * _count)) { log("msg.value < (price * _count)"); throw; }
+        if(_count > availableCount) { log("_count > availableCount"); throw; }
+
+        //create default EscrowInfo struct or access existing
+        EscrowInfo info = escrows[id];
+
+        //lock only once for a given id
+        if(info.lockedFunds > 0) {
+            log("Already locked");
+            throw;
+        }
+
+        //lock funds
+        //refresh watchdog timer
+        activityTime = now;
+
+        uint fee = (msg.value * feePromille) / 1000;
+        uint funds = (msg.value - fee);
+        feeFunds += fee;
+        totalEscrows += 1;
+
+        info.buyer = msg.sender;
+        info.lockedFunds = funds;
+        info.frozenFunds = 0;
+        info.buyerNo = 0;
+        info.sellerNo = 0;
+
+        pendingCount += _count;
+        buyers[msg.sender] = 1;
+
+        //Buy order to event log
+        content(id, datainfo, _version, 1, msg.sender, _count, msg.value);
+    }
+
+    function accept(uint id, string datainfo, uint _version, uint16 _count) onlyowner {
+        if(_count > availableCount) { log("_count > availableCount"); return; }
+        if(_count > pendingCount) { log("_count > pendingCount"); return; }
+
+        pendingCount -= _count;
+        availableCount -= _count;
+
+        //Accept order to event log
+        content(id, datainfo, _version, 2, msg.sender, _count, 0);
+    }
+
+    function reject(uint id, string datainfo, uint _version, uint16 _count, address recipient, uint amount) onlyowner {
+        if(_count > pendingCount) { log("_count > pendingCount"); return; }
+
+        pendingCount -= _count;
+
+        //send money back
+        yes(id, datainfo, _version);
+
+        //Reject order to event log
+        content(id, datainfo, _version, 3, msg.sender, _count, amount);
+    }
+
+    function cancel(string datainfo, uint _version) onlyowner {
+        //Canceled status
+        status = 2;
+
+        //Cancel order to event log
+        content(0, datainfo, _version, 4, msg.sender, availableCount, 0);
+    }
+
+    //remove buyer from the watchlist
+    function unbuy() {
+        buyers[msg.sender] = 0;
+    }
+}
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