136 lines
4.2 KiB
Solidity
136 lines
4.2 KiB
Solidity
// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.16;
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import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
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import {ERC721} from "./ERC721.sol";
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import {IERC721Bindable} from "../interfaces/IERC721Bindable.sol";
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import {IERC721Binder} from "../interfaces/IERC721Binder.sol";
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/// @title ERC-721 Binder Reference Implementation
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contract ERC721Binder is IERC721Binder {
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struct Bindable {
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address tokenAddress;
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uint256 tokenId;
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}
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/// @notice Checks for an owner if an address is an authorized operator.
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mapping(address => mapping(address => bool)) public _isApprovedForAll;
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/// @notice Tracks ownership of bound assets.
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mapping(uint256 => address) _ownerOf;
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/// @notice Maps an asset to a list of all bound bindables.
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mapping(uint256 => Bindable[]) _boundTokens;
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/// @notice Maps a token address and identifier to the bound tokens index.
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mapping(address => mapping(uint256 => uint256)) _boundIndexes;
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/// @dev EIP-165 identifiers for all supported interfaces.
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bytes4 private constant _ERC165_INTERFACE_ID = 0x01ffc9a7;
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bytes4 private constant _ERC721_BINDER_INTERFACE_ID = 0x2ac2d2bc;
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bytes4 private constant _ERC721_BINDABLE_INTERFACE_ID = 0xd92c3ff0;
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/// @inheritdoc IERC721Binder
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function isApprovedForAll(address owner, address operator) external view override returns (bool) {
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return _isApprovedForAll[owner][operator];
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}
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/// @inheritdoc IERC721Binder
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function ownerOf(uint256 id) public view returns (address) {
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return _ownerOf[id];
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}
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/// @inheritdoc IERC721Binder
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function onERC721Bind(
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address operator,
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address from,
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address to,
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uint256 tokenId,
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uint256 bindId,
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bytes calldata data
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) public returns (bytes4) {
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if (_ownerOf[bindId] != to) {
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revert OwnerInvalid();
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}
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if (_boundIndexes[msg.sender][tokenId] != 0) {
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revert BindExistent();
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}
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if (!IERC721Bindable(msg.sender).supportsInterface(_ERC721_BINDABLE_INTERFACE_ID)) {
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revert BindInvalid();
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}
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_boundIndexes[msg.sender][tokenId] = _boundTokens[bindId].length;
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_boundTokens[bindId].push(Bindable(msg.sender, tokenId));
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return IERC721Binder.onERC721Bind.selector;
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}
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/// @inheritdoc IERC721Binder
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function onERC721Unbind(
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address operator,
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address from,
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address to,
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uint256 tokenId,
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uint256 bindId,
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bytes calldata data
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) public returns (bytes4) {
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if (_ownerOf[bindId] != from) {
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revert OwnerInvalid();
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}
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if (_boundIndexes[msg.sender][tokenId] == 0) {
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revert BindNonexistent();
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}
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uint256 boundLastIndex = _boundTokens[bindId].length - 1;
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uint256 boundIndex = _boundIndexes[msg.sender][tokenId];
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if (boundIndex != boundLastIndex) {
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Bindable memory bindable = _boundTokens[bindId][boundLastIndex];
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_boundTokens[bindId][boundIndex] = bindable;
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_boundIndexes[bindable.tokenAddress][bindable.tokenId] = boundIndex;
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}
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delete _boundIndexes[msg.sender][tokenId];
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delete _boundTokens[bindId][boundLastIndex];
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return IERC721Binder.onERC721Unbind.selector;
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}
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/// @notice Transfers an asset from address `from` to address `to`.
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function transfer(
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address from,
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address to,
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uint256 bindId
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) public {
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if (msg.sender != from && !_isApprovedForAll[from][msg.sender]) {
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revert SenderUnauthorized();
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}
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if (from != _ownerOf[bindId]) {
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revert OwnerInvalid();
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}
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if (to == address(0)) {
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revert ReceiverInvalid();
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}
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_ownerOf[bindId] = to;
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Bindable[] memory bindables = _boundTokens[bindId];
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for (uint256 i = 0; i < bindables.length; ++i) {
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IERC721Bindable(bindables[i].tokenAddress).transferFrom(from, to, bindables[i].tokenId);
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}
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}
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function supportsInterface(bytes4 id) external pure returns (bool) {
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return id == _ERC165_INTERFACE_ID || id == _ERC721_BINDER_INTERFACE_ID;
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}
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}
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