86 lines
3.1 KiB
Solidity
86 lines
3.1 KiB
Solidity
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// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
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import "./ERC4671.sol";
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import "./IERC4671Consensus.sol";
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contract ERC4671Consensus is ERC4671, IERC4671Consensus {
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// Consensus voters addresses
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mapping(address => bool) private _voters;
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address[] private _votersArray;
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// Mapping from voter to mint approvals
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mapping(address => mapping(address => bool)) private _mintApprovals;
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// Mapping from owner to approval counts
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mapping(address => uint256) private _mintApprovalCounts;
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// Mapping from voter to revoke approvals
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mapping(address => mapping(uint256 => bool)) private _revokeApprovals;
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// Mapping from tokenId to revoke counts
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mapping(uint256 => uint256) private _revokeApprovalCounts;
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constructor (string memory name_, string memory symbol_, address[] memory voters_) ERC4671(name_, symbol_) {
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_votersArray = voters_;
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for (uint256 i=0; i<voters_.length; i++) {
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_voters[voters_[i]] = true;
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}
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}
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/// @notice Get voters addresses for this consensus contract
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/// @return Addresses of the voters
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function voters() public view virtual override returns (address[] memory) {
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return _votersArray;
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}
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/// @notice Cast a vote to mint a token for a specific address
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/// @param owner Address for whom to mint the token
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function approveMint(address owner) public virtual override {
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require(_voters[msg.sender], "You are not a voter");
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require(!_mintApprovals[msg.sender][owner], "You already approved this address");
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_mintApprovals[msg.sender][owner] = true;
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_mintApprovalCounts[owner] += 1;
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if (_mintApprovalCounts[owner] == _votersArray.length) {
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_resetMintApprovals(owner);
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_mint(owner);
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}
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}
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/// @notice Cast a vote to revoke a token for a specific address
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/// @param tokenId Identifier of the token to revoke
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function approveRevoke(uint256 tokenId) public virtual override {
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require(_voters[msg.sender], "You are not a voter");
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require(!_revokeApprovals[msg.sender][tokenId], "You already approved this address");
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_revokeApprovals[msg.sender][tokenId] = true;
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_revokeApprovalCounts[tokenId] += 1;
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if (_revokeApprovalCounts[tokenId] == _votersArray.length) {
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_resetRevokeApprovals(tokenId);
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_revoke(tokenId);
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}
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}
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function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC4671) returns (bool) {
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return
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interfaceId == type(IERC4671Consensus).interfaceId ||
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super.supportsInterface(interfaceId);
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}
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function _resetMintApprovals(address owner) private {
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for (uint256 i=0; i<_votersArray.length; i++) {
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_mintApprovals[_votersArray[i]][owner] = false;
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}
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_mintApprovalCounts[owner] = 0;
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}
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function _resetRevokeApprovals(uint256 tokenId) private {
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for (uint256 i=0; i<_votersArray.length; i++) {
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_revokeApprovals[_votersArray[i]][tokenId] = false;
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}
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_revokeApprovalCounts[tokenId] = 0;
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}
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}
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