forked from DecentralizedClimateFoundation/DCIPs
347 lines
10 KiB
Solidity
347 lines
10 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 "./interface/IMFNFT.sol";
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import "./interface/IERC721.sol";
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import "./math/SafeMath.sol";
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import "./helper/Verifier.sol";
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/**
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* @title TWIG_FNFT Contract
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*/
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contract MFNFT is IMFNFT, Verifier {
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using SafeMath for uint256;
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mapping(uint256 => mapping(address => uint256)) private _balances;
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mapping(uint256 => mapping(address => mapping(address => uint256)))
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private _allowed;
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// uint256 private _totalSupply;
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mapping(uint256 => uint256) _totalSupply;
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// NFT Contract Address
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// address private _parentToken;
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mapping(uint256 => address) _parentToken;
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// NFT ID of NFT(RFT) - TokenId
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// uint256 private _parentTokenId;
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mapping(uint256 => uint256) _parentTokenId;
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//
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mapping(address => mapping(uint256 => uint256)) private _Ids;
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// Scalar value to distinguish fractionalized NFT
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uint256 public _id;
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// Admin Address to Set the Parent NFT
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address private _admin;
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// Event emitted when token is added
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event TokenAddition(
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address indexed token,
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uint256 tokenId,
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uint256 _id,
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uint256 totalSupply
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);
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constructor() {
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_admin = msg.sender;
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}
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/**
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* @dev onlyAdmin prohibits function calls arbitrary msg.sender
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* except _admin
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*/
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modifier onlyAdmin() {
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require(msg.sender == _admin);
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_;
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}
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/**
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* @dev Mandatory function to receive NFT as a contract(CA)
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* @return Bytes4 which is the selector of this function
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*/
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function onERC721Received(
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address _operator,
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address _from,
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uint256 _tokenId,
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bytes calldata _data
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) external pure returns (bytes4) {
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return this.onERC721Received.selector;
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}
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/**
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* @dev (ERC165) Determines if this contract supports Re-FT(ERC1633).
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* @param interfaceID The bytes4 to query if it matches with the contract interface id.
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*/
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function supportsInterface(bytes4 interfaceID)
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external
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pure
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returns (bool)
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{
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return
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interfaceID == this.supportsInterface.selector || // ERC165
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interfaceID == this.parentToken.selector || // parentToken()
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interfaceID == this.parentTokenId.selector || // parentTokenId()
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interfaceID ==
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this.parentToken.selector ^ this.parentTokenId.selector; // RFT
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}
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/**
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* @dev Sets the Address of NFT Contract Address & NFT Token ID
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* @param parentNFTContractAddress The address NFT Contract address.
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* @param parentNFTTokenId The token id of NFT.
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*/
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function setParentNFT(
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address parentNFTContractAddress,
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uint256 parentNFTTokenId,
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uint256 totalSupply
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) public onlyAdmin {
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require(
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parentNFTContractAddress != address(0),
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"MFNFT::setParentNFT: Parent NFT Contract should not be zero"
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);
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require(
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getTokenId(parentNFTContractAddress, parentNFTTokenId) == 0,
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"MFNFT::setParentNFT: Already owned(fractionalized) by this contract"
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);
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verifyOwnership(parentNFTContractAddress, parentNFTTokenId);
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_id++;
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_Ids[parentNFTContractAddress][parentNFTTokenId] = _id;
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_parentToken[_id] = parentNFTContractAddress;
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_parentTokenId[_id] = parentNFTTokenId;
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_totalSupply[_id] = totalSupply;
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_balances[_id][msg.sender] = totalSupply;
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emit TokenAddition(
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parentNFTContractAddress,
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parentNFTTokenId,
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_id,
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totalSupply
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);
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}
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/**
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* @dev Returns the tokenId of with the given NFT information
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* @return An uint256 value representing the tokenId of given NFT
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*/
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function getTokenId(address token, uint256 tokenId)
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public
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view
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returns (uint256)
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{
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return _Ids[token][tokenId];
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}
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/**
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* @dev Returns if the NFT is owned(fractionalized) by this contract.
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* @return An bool representing whether the NFT is fractionalized by this contract
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*/
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function isRegistered(address token, uint256 tokenId) public view returns (bool) {
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return (_Ids[token][tokenId] != 0);
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}
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/**
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* @dev Returns the Address of Parent Token Address
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* @return An Address representing the address of NFT Contract this Re-FT is pointing to.
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*/
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function parentToken(uint256 tokenId) external view returns (address) {
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return _parentToken[tokenId];
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}
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/**
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* @dev Returns the Token ID of NFT
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* @return An uint256 representing the token id of the NFT this Re-FT is pointing to.
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*/
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function parentTokenId(uint256 tokenId) external view returns (uint256) {
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return _parentTokenId[tokenId];
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}
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/**
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* @dev Total number of tokens in existence
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*/
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function totalSupply(uint256 tokenId)
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public
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view
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override
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returns (uint256)
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{
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return _totalSupply[tokenId];
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}
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/**
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* @dev Gets the balance of the specified address.
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* @param owner The address to query the balance of.
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* @return An uint256 representing the amount owned by the passed address.
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*/
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function balanceOf(address owner, uint256 tokenId)
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public
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view
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override
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returns (uint256)
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{
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return _balances[tokenId][owner];
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}
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/**
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* @dev Function to check the amount of tokens that an owner allowed to a spender.
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* @param owner address The address which owns the funds.
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* @param spender address The address which will spend the funds.
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* @return A uint256 specifying the amount of tokens still available for the spender.
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*/
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function allowance(
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address owner,
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address spender,
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uint256 tokenId
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) public view override returns (uint256) {
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return _allowed[tokenId][owner][spender];
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}
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/**
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* @dev Transfer token for a specified address
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* @param to The address to transfer to.
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* @param value The amount to be transferred.
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*/
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function transfer(
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address to,
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uint256 tokenId,
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uint256 value
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) public override returns (bool) {
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_transfer(msg.sender, to, tokenId, value);
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return true;
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}
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/**
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* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
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* Beware that changing an allowance with this method brings the risk that someone may use both the old
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* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
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* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
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* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
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* @param spender The address which will spend the funds.
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* @param value The amount of tokens to be spent.
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*/
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function approve(
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address spender,
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uint256 tokenId,
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uint256 value
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) public override returns (bool) {
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require(spender != address(0));
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_allowed[tokenId][msg.sender][spender] = value;
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emit Approval(msg.sender, spender, tokenId, value);
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return true;
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}
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/**
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* @dev Transfer tokens from one address to another.
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* Note that while this function emits an Approval event, this is not required as per the specification,
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* and other compliant implementations may not emit the event.
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* @param from address The address which you want to send tokens from
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* @param to address The address which you want to transfer to
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* @param value uint256 the amount of tokens to be transferred
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*/
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function transferFrom(
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address from,
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address to,
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uint256 tokenId,
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uint256 value
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) public override returns (bool) {
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_allowed[tokenId][from][msg.sender] = _allowed[tokenId][from][
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msg.sender
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].sub(value);
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_transfer(from, to, tokenId, value);
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emit Approval(
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from,
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msg.sender,
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tokenId,
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_allowed[tokenId][from][msg.sender]
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);
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return true;
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}
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/**
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* @dev Increase the amount of tokens that an owner allowed to a spender.
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* approve should be called when allowed_[_spender] == 0. To increment
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* allowed value is better to use this function to avoid 2 calls (and wait until
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* the first transaction is mined)
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* From MonolithDAO Token.sol
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* Emits an Approval event.
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* @param spender The address which will spend the funds.
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* @param addedValue The amount of tokens to increase the allowance by.
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*/
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function increaseAllowance(
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address spender,
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uint256 tokenId,
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uint256 addedValue
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) public returns (bool) {
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require(spender != address(0));
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_allowed[tokenId][msg.sender][spender] = _allowed[tokenId][msg.sender][
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spender
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].add(addedValue);
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emit Approval(
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msg.sender,
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spender,
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tokenId,
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_allowed[tokenId][msg.sender][spender]
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);
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return true;
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}
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/**
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* @dev Decrease the amount of tokens that an owner allowed to a spender.
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* approve should be called when allowed_[_spender] == 0. To decrement
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* allowed value is better to use this function to avoid 2 calls (and wait until
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* the first transaction is mined)
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* From MonolithDAO Token.sol
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* Emits an Approval event.
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* @param spender The address which will spend the funds.
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* @param subtractedValue The amount of tokens to decrease the allowance by.
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*/
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function decreaseAllowance(
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address spender,
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uint256 tokenId,
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uint256 subtractedValue
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) public returns (bool) {
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require(spender != address(0));
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_allowed[tokenId][msg.sender][spender] = _allowed[tokenId][msg.sender][
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spender
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].sub(subtractedValue);
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emit Approval(
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msg.sender,
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spender,
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tokenId,
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_allowed[tokenId][msg.sender][spender]
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);
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return true;
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}
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/**
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* @dev Transfer token for a specified addresses
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* @param from The address to transfer from.
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* @param to The address to transfer to.
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* @param value The amount to be transferred.
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*/
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function _transfer(
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address from,
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address to,
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uint256 tokenId,
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uint256 value
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) internal {
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require(to != address(0));
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_balances[tokenId][from] = _balances[tokenId][from].sub(value);
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_balances[tokenId][to] = _balances[tokenId][to].add(value);
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emit Transfer(from, to, tokenId, value);
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}
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}
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