forked from DecentralizedClimateFoundation/DCIPs
85 lines
1.9 KiB
Solidity
85 lines
1.9 KiB
Solidity
/*
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Consumer
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SPDX-License-Identifier: CC0-1.0
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*/
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
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import "@openzeppelin/contracts/utils/Address.sol";
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import "./IERC721Holder.sol";
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/**
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* @title Consumer
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*
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* @notice this contract implements an example "consumer" of the proposed
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* held token ERC standard.
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* This example consumer contract will query ERC721 ownership and balances
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* including any "held" tokens
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*/
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contract Consumer {
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using Address for address;
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// members
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IERC721 public token;
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/**
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* @param token_ address of ERC721 token
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*/
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constructor(address token_) {
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token = IERC721(token_);
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}
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/**
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* @notice get the functional owner of a token
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* @param tokenId token id of interest
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*/
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function getOwner(uint256 tokenId) external view returns (address) {
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// get raw owner
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address owner = token.ownerOf(tokenId);
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// if owner is not contract, return
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if (!owner.isContract()) {
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return owner;
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}
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// check for token holder interface support
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try IERC165(owner).supportsInterface(0x16b900ff) returns (bool ret) {
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if (!ret) return owner;
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} catch {
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return owner;
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}
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// check for held owner
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try IERC721Holder(owner).heldOwnerOf(address(token), tokenId) returns (address user) {
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if (user != address(0)) return user;
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} catch {}
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return owner;
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}
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/**
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* @notice get the total user balance including held tokens
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* @param owner user address
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* @param holders list of token holder addresses
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*/
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function getBalance(address owner, address[] calldata holders)
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external
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view
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returns (uint256)
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{
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// start with raw token balance
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uint256 balance = token.balanceOf(owner);
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// consider each provided token holder contract
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for (uint256 i = 0; i < holders.length; i++) {
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balance += IERC721Holder(holders[i]).heldBalanceOf(address(token), owner);
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}
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return balance;
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}
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}
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