English auction contract

contracts/FeralfileEnglishAuction.sol

@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.13;
+
+import "@openzeppelin/contracts/utils/Strings.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+import "./FeralfileSaleData.sol";
+import "./ECDSASigner.sol";
+import "./IFeralfileVault.sol";
+
+contract FFV4 is FeralfileSaleData {
+    function buyArtworks(
+        bytes32 r_,
+        bytes32 s_,
+        uint8 v_,
+        SaleData calldata saleData_
+    ) external payable {}
+}
+
+contract FeralfileEnglishAuction is Ownable, FeralfileSaleData, ECDSASigner {
+    struct EnglishAuction {
+        bytes32 id;
+        uint256 startAt;
+        uint256 endAt;
+        uint256 extendDuration;
+        uint256 extendThreshold;
+        uint256 minIncreaseFactor;
+        uint256 minIncreaseAmount;
+        uint256 minPrice;
+    }
+
+    struct Bid {
+        address bidder;
+        uint256 amount;
+        bool fromFeralFile;
+    }
+
+    mapping(bytes32 => EnglishAuction) public auctions;
+    mapping(bytes32 => Bid) public auctionLatestBid;
+
+    constructor(address signer_) ECDSASigner(signer_) {}
+
+    function getAuctionID(
+        address tokenContractAddr_,
+        uint256[] memory tokenIDs_
+    ) public view returns (bytes32) {
+        // order the tokenIDs based on certain rule
+        for (uint i = 0; i < tokenIDs_.length - 1; i++) {
+            uint minIndex = i;
+            for (uint j = i + 1; j < tokenIDs_.length; j++) {
+                if (tokenIDs_[j] < tokenIDs_[minIndex]) {
+                    minIndex = j;
+                }
+            }
+            (tokenIDs_[i], tokenIDs_[minIndex]) = (
+                tokenIDs_[minIndex],
+                tokenIDs_[i]
+            );
+        }
+
+        // hash the (contractAddr + ordered tokenIDs)
+        bytes32 message = keccak256(
+            abi.encode(block.chainid, tokenContractAddr_, tokenIDs_)
+        );
+
+        // return hash as identifier
+        return message;
+    }
+
+    function auctionOngoing(bytes32 aucId_) public view returns (uint256) {
+        // check the auction status and return
+        require(
+            auctions[aucId_].id != 0,
+            "FeralfileEnglishAuction: auction not found"
+        );
+
+        return block.timestamp;
+
+        // return
+        //     auctions[aucId_].startAt <= block.timestamp &&
+        //     auctions[aucId_].endAt >= block.timestamp;
+    }
+
+    function setEnglishAuctions(
+        EnglishAuction[] calldata auctions_
+    ) external onlyOwner {
+        // for-loop to set the auction
+        // able to reset an auction if there's no winner and highest bid = 0
+        for (uint256 i = 0; i < auctions_.length; i++) {
+            EnglishAuction memory auc_ = auctions[auctions_[i].id];
+
+            require(
+                auc_.id == 0,
+                "FeralfileEnglishAuction: auction already exist"
+            );
+
+            require(
+                auctions_[i].startAt > block.timestamp,
+                "FeralfileEnglishAuction: auction start time should be in the future"
+            );
+
+            require(
+                auctions_[i].endAt > auctions_[i].startAt,
+                "FeralfileEnglishAuction: auction end time should be after start time"
+            );
+
+            require(
+                auctions_[i].extendDuration > 0,
+                "FeralfileEnglishAuction: auction extend duration should be greater than 0"
+            );
+
+            require(
+                auctions_[i].extendThreshold > 0,
+                "FeralfileEnglishAuction: auction extend threshold should be greater than 0"
+            );
+
+            require(
+                auctions_[i].minIncreaseFactor > 0,
+                "FeralfileEnglishAuction: auction min increase factor should be greater than 0"
+            );
+
+            require(
+                auctions_[i].minIncreaseAmount > 0,
+                "FeralfileEnglishAuction: auction min increase amount should be greater than 0"
+            );
+
+            require(
+                auctions_[i].minPrice > 0,
+                "FeralfileEnglishAuction: auction min price should be greater than 0"
+            );
+
+            auctions[auctions_[i].id] = auctions_[i];
+        }
+    }
+
+    function isValidBidRequest(
+        EnglishAuction memory auction_,
+        Bid memory lastBid_,
+        address bidder_,
+        uint256 amount_,
+        uint256 timestamp_
+    ) internal pure returns (bool) {
+        // make sure the auction exist
+        require(
+            auction_.id.length > 0,
+            "FeralfileEnglishAuction: auction not found"
+        );
+        // check if auction started
+        require(
+            auction_.startAt < timestamp_,
+            "FeralfileEnglishAuction: auction not started"
+        );
+        // check if now() under auction end time
+        require(
+            auction_.endAt > timestamp_,
+            "FeralfileEnglishAuction: auction already ended"
+        );
+        // check if current winner not equal to current bidder (optional)
+        require(
+            lastBid_.bidder != bidder_,
+            "FeralfileEnglishAuction: bidder is the current winner"
+        );
+        // check bidding amount > highest bid amount
+        require(
+            amount_ > lastBid_.amount,
+            "FeralfileEnglishAuction: bid amount should be greater than highest bid amount"
+        );
+        if (lastBid_.amount > 0) {
+            // check bidding amount follow the minimum increment
+            uint256 minIncreaseAmount_ = (lastBid_.amount *
+                auction_.minIncreaseFactor) / 100;
+            if (minIncreaseAmount_ < auction_.minIncreaseAmount) {
+                minIncreaseAmount_ = auction_.minIncreaseAmount;
+            }
+            require(
+                amount_ >= lastBid_.amount + minIncreaseAmount_,
+                "FeralfileEnglishAuction: bid amount should follow the minimum increment"
+            );
+        } else {
+            // check bidding amount follow the minimum price
+            require(
+                amount_ >= auction_.minPrice,
+                "FeralfileEnglishAuction: bid amount should be greater than minimum price"
+            );
+        }
+        return true;
+    }
+
+    function bidOnAuction(bytes32 aucId_) external payable {
+        // get the auction object
+        EnglishAuction memory auction_ = auctions[aucId_];
+        // get the last auction bid object
+        Bid memory lastBid_ = auctionLatestBid[aucId_];
+        // verify the bid is valid
+        require(
+            isValidBidRequest(
+                auction_,
+                lastBid_,
+                msg.sender,
+                msg.value,
+                block.timestamp
+            ),
+            "FeralfileEnglishAuction: invalid bid"
+        );
+        // transfer last winning bid amount to last bidder if fromFeralFile is false
+        if (!lastBid_.fromFeralFile) {
+            payable(lastBid_.bidder).transfer(lastBid_.amount);
+        }
+        // replace the new bid to bid map
+        auctionLatestBid[aucId_] = Bid({
+            bidder: msg.sender,
+            amount: msg.value,
+            fromFeralFile: false
+        });
+        // if the gap to end time is lower than threshold, update the auction end time to now() + extend duration
+        if (auction_.endAt - block.timestamp < auction_.extendThreshold) {
+            auctions[aucId_].endAt = block.timestamp + auction_.extendDuration;
+        }
+        // emit new bid event
+        emit NewBid(aucId_, msg.sender, msg.value);
+    }
+
+    function bidOnAuctionByFeralFile(
+        bytes32 aucId_,
+        address bidder_,
+        uint256 amount_,
+        uint256 timestamp_,
+        bytes32 r_,
+        bytes32 s_,
+        uint8 v_
+    ) external {
+        // get the auction object
+        EnglishAuction memory auction_ = auctions[aucId_];
+        // get the last auction bid object
+        Bid memory lastBid_ = auctionLatestBid[aucId_];
+        // verify the bid is valid
+        require(
+            isValidBidRequest(auction_, lastBid_, bidder_, amount_, timestamp_),
+            "FeralfileEnglishAuction: invalid bid"
+        );
+        // make sure the auction exist
+        // get the auction object
+        // get the last auction bid object
+        // check if current winner not equal to current bidder (optional)
+        // check if now() under auction end time
+        // check bidding amount > highest bid amount
+        // check bidding amount follow the minimum increment
+        // check timestamp should in 10 mins
+
+        // check the signature of (aucId + bidder + amount + timestamp) to make sure the request is from Feral File
+        bytes32 message_ = keccak256(
+            abi.encode(block.chainid, aucId_, bidder_, amount_, timestamp_)
+        );
+        require(
+            isValidSignature(message_, r_, s_, v_),
+            "FeralfileEnglishAuction: invalid signature"
+        );
+        // transfer last winning bid amount to last bidder if fromFeralFile is false
+        if (!lastBid_.fromFeralFile) {
+            payable(lastBid_.bidder).transfer(lastBid_.amount);
+        }
+        // replace the new bid to bid map
+        auctionLatestBid[aucId_] = Bid({
+            bidder: bidder_,
+            amount: amount_,
+            fromFeralFile: true
+        });
+        // if the gap to end time is lower than threshold, update the auction end time to now() + extend duration
+        if (auction_.endAt - block.timestamp < auction_.extendThreshold) {
+            auctions[aucId_].endAt = block.timestamp + auction_.extendDuration;
+        }
+        // emit new bid event
+        emit NewBid(aucId_, bidder_, amount_);
+    }
+
+    function settleAuction(
+        bytes32 r_,
+        bytes32 s_,
+        uint8 v_,
+        address tokenContractAddr_,
+        SaleData memory saleData_
+    ) external onlyOwner {
+        // transfer winning bid amount to Feral File Vault contract if winning bid is crypto bid
+        bytes32 aucId_ = keccak256(
+            abi.encodePacked(
+                getAuctionID(tokenContractAddr_, saleData_.tokenIds)
+            )
+        );
+        EnglishAuction memory auction_ = auctions[aucId_];
+        require(
+            auction_.id.length > 0,
+            "FeralfileEnglishAuction: auction not found"
+        );
+        Bid memory lastBid_ = auctionLatestBid[aucId_];
+        require(
+            lastBid_.bidder != address(0),
+            "FeralfileEnglishAuction: no bid"
+        );
+
+        saleData_.destination = lastBid_.bidder;
+        FFV4(tokenContractAddr_).buyArtworks(r_, s_, v_, saleData_);
+    }
+
+    event NewBid(
+        bytes32 indexed auctionId,
+        address indexed bidder,
+        uint256 indexed amount
+    );
+}

migrations/251_feralfile_english_auction.js

@@ -0,0 +1,11 @@
+var FeralfileEnglishAuction = artifacts.require("FeralfileEnglishAuction");
+
+const argv = require("minimist")(process.argv.slice(2), {
+    string: ["exhibition_signer"],
+});
+
+module.exports = function (deployer) {
+    let exhibition_signer =
+        argv.exhibition_signer || "0xdB33365a8730de2F7574ff1189fB9D337bF4c36d";
+    deployer.deploy(FeralfileEnglishAuction, exhibition_signer);
+};