forked from DecentralizedClimateFoundation/DCIPs
137 lines
4.0 KiB
Solidity
137 lines
4.0 KiB
Solidity
// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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import "./ERC5501.sol";
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import "./IERC5501Terminable.sol";
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/**
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* @dev Implementation of Terminable extension of https://eips.ethereum.org/EIPS/eip-5501 with OpenZeppelin ERC721 version.
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*/
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contract ERC5501Terminable is IERC5501Terminable, ERC5501 {
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/**
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* @dev Structure to hold agreements from both parties to terminate a borrow.
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* @notice If both parties agree, it is possible to modify UserInfo even before it expires.
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* In such case, isBorrowed status is reverted to false.
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*/
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struct BorrowTerminationInfo {
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bool lenderAgreement;
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bool borrowerAgreement;
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}
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// Mapping from token ID to BorrowTerminationInfo
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mapping(uint256 => BorrowTerminationInfo) internal _borrowTerminations;
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/**
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* @dev Initializes the contract by setting a name and a symbol to the token collection.
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*/
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constructor(string memory name_, string memory symbol_)
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ERC5501(name_, symbol_)
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{}
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/**
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* @dev See {IERC5501-setUser}.
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*/
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function setUser(
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uint256 tokenId,
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address user,
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uint64 expires,
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bool isBorrowed
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) public virtual override {
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super.setUser(tokenId, user, expires, isBorrowed);
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delete _borrowTerminations[tokenId];
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emit ResetTerminationAgreements(tokenId);
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}
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/**
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* @dev See {IERC5501Terminable-setBorrowTermination}.
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*/
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function setBorrowTermination(uint256 tokenId) public virtual override {
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UserInfo storage userInfo = _users[tokenId];
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require(
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userInfo.expires >= block.timestamp && userInfo.isBorrowed,
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"ERC5501Terminable: borrow not active"
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);
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BorrowTerminationInfo storage terminationInfo = _borrowTerminations[
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tokenId
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];
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if (ownerOf(tokenId) == msg.sender) {
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terminationInfo.lenderAgreement = true;
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emit AgreeToTerminateBorrow(tokenId, msg.sender, true);
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}
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if (userInfo.user == msg.sender) {
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terminationInfo.borrowerAgreement = true;
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emit AgreeToTerminateBorrow(tokenId, msg.sender, false);
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}
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}
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/**
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* @dev See {IERC5501Terminable-getBorrowTermination}.
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*/
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function getBorrowTermination(uint256 tokenId)
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public
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view
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virtual
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override
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returns (bool, bool)
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{
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return (
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_borrowTerminations[tokenId].lenderAgreement,
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_borrowTerminations[tokenId].borrowerAgreement
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);
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}
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/**
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* @dev See {IERC5501Terminable-terminateBorrow}.
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*/
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function terminateBorrow(uint256 tokenId) public virtual override {
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BorrowTerminationInfo storage info = _borrowTerminations[tokenId];
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require(
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info.lenderAgreement && info.borrowerAgreement,
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"ERC5501Terminable: not agreed"
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);
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_users[tokenId].isBorrowed = false;
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delete _borrowTerminations[tokenId];
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emit ResetTerminationAgreements(tokenId);
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emit TerminateBorrow(
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tokenId,
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ownerOf(tokenId),
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_users[tokenId].user,
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msg.sender
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);
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}
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/**
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* @dev See {EIP-165: Standard Interface Detection}.
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* https://eips.ethereum.org/EIPS/eip-165
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*/
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function supportsInterface(bytes4 interfaceId)
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public
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view
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virtual
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override
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returns (bool)
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{
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return
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interfaceId == type(IERC5501Terminable).interfaceId ||
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super.supportsInterface(interfaceId);
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}
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/**
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* @dev Hook that is called after any token transfer.
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* If user is set and token is borrowed, reset termination agreements.
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*/
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function _afterTokenTransfer(
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address from,
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address to,
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uint256 tokenId
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) internal virtual override {
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super._afterTokenTransfer(from, to, tokenId);
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if (from != to && _users[tokenId].isBorrowed) {
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delete _borrowTerminations[tokenId];
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emit ResetTerminationAgreements(tokenId);
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}
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}
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}
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