bounties-proxy.sol

pragma solidity ^0.4.24;

contract BountyProxy {
  address impl;
  using BountyLibrary for BountyLibrary.Bounty;
  BountyLibrary.Bounty bounty;

  constructor(bytes32 _reference, address _issuer, uint _deadline, address _lib) public payable {
      impl = _lib;
      bounty.init(_reference, _issuer, _deadline);
  }

  function forward(bytes32 _sig, bytes _data) external payable {
    bytes4 sig = bytes4(_sig);
    address _impl = impl;
    require(_impl != address(0));
    assembly {
      let _message := mload(0x40) //find empty memory location
      let _bounty := sload(0x0) //load bounty from storage
      calldatacopy(_message, 0, 4) //place sig at beginning of empty storage
      //add _bounty
      mstore(add(_message, ), _bounty)
      //add _data
      calldatacopy(add(_message, 36), 100, sub(calldatasize,100))
      let result := delegatecall(gas, _impl, _message, msize, 0, returndatasize)
      //return data ??????
      returndatacopy(_message, 0, returndatasize)
      switch result
      case 0 {revert(_message, returndatasize) }
      default { return(_message, returndatasize) }
    }
  }
}

contract BountyFactory3 {

    address[] public bounties;

    function createBounty(
    bytes32 _reference,
    uint _deadline,
    address _lib) external payable {
      address newBounty = (new BountyProxy).value(msg.value)(_reference, msg.sender, _deadline, _lib);
      bounties.push(newBounty);
    }
}

library BountyLibrary {

//STATE VARIABLES
  struct Bounty {
    address self;
    bytes32 reference;
    address issuer;
    uint timestamp;
    uint deadline;
    uint reward;
    statusOptions status;
    Proposal[] proposals;
  }

  struct Proposal {
    bytes32 reference;
    address author;
    bool accepted;
    uint timestamp;
  }

  enum statusOptions {ACTIVE, COMPLETED, ABANDONED}

  function init(
    Bounty storage _bounty,
    bytes32 _reference,
    address _issuer,
    uint _deadline
    ) external {
      require(_deadline > now, "Deadline must be a future date");
      require(msg.value > 0, "Reward must be greater than 0");
      _bounty.reference = _reference;
      _bounty.issuer = _issuer;
      _bounty.timestamp = now;
      _bounty.deadline = _deadline;
      _bounty.reward = msg.value;
      _bounty.status = statusOptions.ACTIVE;
    }

    function getBounty(Bounty storage _bounty)
      external
      view
      returns (
        bytes32,
        address,
        uint,
        uint,
        uint,
        statusOptions status
        ) {
          return (
            _bounty.reference,
            _bounty.issuer,
            _bounty.timestamp,
            _bounty.deadline,
            address(this).balance,
            _bounty.status
            );
        }

    function getProposals(Bounty storage _bounty) external view returns (uint) {
      return _bounty.proposals.length;
    }

    function cancelBounty(Bounty storage _bounty) external {
      require(_bounty.issuer == msg.sender);
      require(_bounty.status == statusOptions.ACTIVE);
      require(_bounty.proposals.length < 1);
      _bounty.status = statusOptions.ABANDONED;
    }

    function submitProposal(Bounty storage _bounty, bytes32 _reference) external {
      require(_bounty.issuer != msg.sender);
      require(_bounty.status == statusOptions.ACTIVE);
      Proposal memory newProposal;
      newProposal.reference = _reference;
      newProposal.author = msg.sender;
      newProposal.accepted = false;
      newProposal.timestamp = now;
      _bounty.proposals.push(newProposal);
    }

    function getProposal(Bounty storage _bounty, uint _id) external view returns (bytes32 reference, address author, bool accepted, uint timestamp) {
      return (_bounty.proposals[_id].reference, _bounty.proposals[_id].author, _bounty.proposals[_id].accepted, _bounty.proposals[_id].timestamp);
    }

    function acceptProposal(Bounty storage _bounty, uint _id) external {
      require(_bounty.issuer == msg.sender);
      require(_bounty.status == statusOptions.ACTIVE);
      assert(_bounty.proposals[_id].author != msg.sender);
      _bounty.status = statusOptions.COMPLETED;
      _bounty.proposals[_id].accepted = true;
      _bounty.proposals[_id].author.transfer(_bounty.reward);
    }
}