pic2peer_gnosis.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "hardhat/console.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";


interface OptimisticOracleV2Interface {
    struct RequestSettings {
        bool eventBased; // True if the request is set to be event-based.
        bool refundOnDispute; // True if the requester should be refunded their reward on dispute.
        bool callbackOnPriceProposed; // True if callbackOnPriceProposed callback is required.
        bool callbackOnPriceDisputed; // True if callbackOnPriceDisputed callback is required.
        bool callbackOnPriceSettled; // True if callbackOnPriceSettled callback is required.
        uint256 bond; // Bond that the proposer and disputer must pay on top of the final fee.
        uint256 customLiveness; // Custom liveness value set by the requester.
    }
    struct Request {
        address proposer; // Address of the proposer.
        address disputer; // Address of the disputer.
        IERC20 currency; // ERC20 token used to pay rewards and fees.
        bool settled; // True if the request is settled.
        RequestSettings requestSettings; // Custom settings associated with a request.
        int256 proposedPrice; // Price that the proposer submitted.
        int256 resolvedPrice; // Price resolved once the request is settled.
        uint256 expirationTime; // Time at which the request auto-settles without a dispute.
        uint256 reward; // Amount of the currency to pay to the proposer on settlement.
        uint256 finalFee; // Final fee to pay to the Store upon request to the DVM.
    }
    
    function requestPrice(bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, IERC20 currency, uint256 reward) external returns (uint256 totalBond);
    function proposePrice(address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, int256 proposedPrice) external returns (uint256 totalBond);
    function setCustomLiveness(bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, uint256 customLiveness) external;
    function settle(address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData) external returns (uint256 payout);
    function getRequest(address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData) external view returns (Request memory);
}

contract pic2peer {

    // variables
    address public owner;
    address seller;
    address buyer;
    uint counter;
    uint settlement;
    IERC721 token;
    
    // oracle related variables
    OptimisticOracleV2Interface oo = OptimisticOracleV2Interface(0xd2ecb3afe598b746F8123CaE365a598DA831A449); // Gnosis
    bytes32 identifier = bytes32("YES_OR_NO_QUERY");

    // struct for identifying transactions
    struct ERC721Item {
      address seller;
      address buyer;
      uint256 item;
    }

    mapping(uint256 => ERC721Item) public erc721Items;

    // events
    event Asserted(address indexed asserter, uint256 requestTime);
    event Deposited(address indexed payee, address tokenAddress, uint256 item);
    event Withdrawn(address indexed payee, address tokenAddress, uint256 item);

    // constructor
    constructor(IERC721 _token) {
      owner = payable(msg.sender);
      token = _token;
      settlement = 2;
      counter = 0;
    }

    // modifiers
    modifier buyerOnly() { require(msg.sender == buyer); _; }
    modifier sellerOnly() { require(msg.sender == seller); _; }
    modifier settleSeller() { require(settlement == 0); _; }
    modifier onlyOwner() { require(msg.sender == owner, "Must be an owner."); _; }

    // deposit function
    function deposit(address _buyer,  uint256 _item) public payable {
      seller = msg.sender;
      require(msg.sender == token.ownerOf(_item), "Sender is not a token owner.") ;
      token.transferFrom(msg.sender, address(this), _item);
      //uint256 id = counter;
      erc721Items[_item] = ERC721Item({
        seller: msg.sender,
        buyer: _buyer,
        item: _item
      });

      emit Deposited(_buyer, address(token), _item);
    }

    function withdraw_seller(uint256 _item) sellerOnly public {
      buyer = erc721Items[_item].buyer;
      uint256 item = erc721Items[_item].item;
      delete(erc721Items[_item]);
      IERC721(address(token)).transferFrom(address(this), buyer, item);
      emit Withdrawn(buyer, address(token), item);
    }

    function resolve_seller(uint256 _item) settleSeller sellerOnly public {
      seller = erc721Items[_item].seller;
      uint256 item = erc721Items[_item].item;
      delete(erc721Items[_item]);
      IERC721(address(token)).transferFrom(address(this), seller, item);
      emit Withdrawn(seller, address(token), item);
    }

    function makeAssertion(string calldata assertion) public {
        bytes memory ancillaryData = bytes(assertion);
        uint256 requestTime = block.timestamp - 1;
        IERC20 bondCurrency = IERC20(0xe91D153E0b41518A2Ce8Dd3D7944Fa863463a97d); // Gnosis Wrapped Native
        uint256 reward = 0;

        oo.requestPrice(identifier, requestTime, ancillaryData, bondCurrency, reward);
        oo.setCustomLiveness(identifier, requestTime, ancillaryData, 60);
        oo.proposePrice(address(this), identifier, requestTime, ancillaryData, 1 ether);
        emit Asserted(msg.sender, requestTime);
    }

    function confirmpayment(string calldata assertion, uint256 requestTime) public {
        bytes memory ancillaryData = bytes(assertion);
        oo.settle(address(this), identifier, requestTime, ancillaryData);
    }

    function getTruth(string calldata assertion, uint256 requestTime) public view returns (int256) {
        bytes memory ancillaryData = bytes(assertion);
        return oo.getRequest(address(this), identifier, requestTime, ancillaryData).resolvedPrice;
    }

    function release_enefti(string calldata assertion, uint256 requestTime, uint256 _item) public {
        bytes memory ancillaryData = bytes(assertion);
        oo.settle(address(this), identifier, requestTime, ancillaryData);
        int256 answer = 0;
        answer = oo.getRequest(address(this), identifier, requestTime, ancillaryData).resolvedPrice;

        if (answer == 1 ether){
            buyer = erc721Items[_item].buyer;
            uint256 item = erc721Items[_item].item;
            delete(erc721Items[_item]);
            IERC721(address(token)).transferFrom(address(this), buyer, item);
            emit Withdrawn(buyer, address(token), item);
        }
    }
}