DCIPs/assets/eip-4675/contracts/MFNFT.sol

347 lines
10 KiB
Solidity

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.0;
import "./interface/IMFNFT.sol";
import "./interface/IERC721.sol";
import "./math/SafeMath.sol";
import "./helper/Verifier.sol";
/**
* @title TWIG_FNFT Contract
*/
contract MFNFT is IMFNFT, Verifier {
using SafeMath for uint256;
mapping(uint256 => mapping(address => uint256)) private _balances;
mapping(uint256 => mapping(address => mapping(address => uint256)))
private _allowed;
// uint256 private _totalSupply;
mapping(uint256 => uint256) _totalSupply;
// NFT Contract Address
// address private _parentToken;
mapping(uint256 => address) _parentToken;
// NFT ID of NFT(RFT) - TokenId
// uint256 private _parentTokenId;
mapping(uint256 => uint256) _parentTokenId;
//
mapping(address => mapping(uint256 => uint256)) private _Ids;
// Scalar value to distinguish fractionalized NFT
uint256 public _id;
// Admin Address to Set the Parent NFT
address private _admin;
// Event emitted when token is added
event TokenAddition(
address indexed token,
uint256 tokenId,
uint256 _id,
uint256 totalSupply
);
constructor() {
_admin = msg.sender;
}
/**
* @dev onlyAdmin prohibits function calls arbitrary msg.sender
* except _admin
*/
modifier onlyAdmin() {
require(msg.sender == _admin);
_;
}
/**
* @dev Mandatory function to receive NFT as a contract(CA)
* @return Bytes4 which is the selector of this function
*/
function onERC721Received(
address _operator,
address _from,
uint256 _tokenId,
bytes calldata _data
) external pure returns (bytes4) {
return this.onERC721Received.selector;
}
/**
* @dev (ERC165) Determines if this contract supports Re-FT(ERC1633).
* @param interfaceID The bytes4 to query if it matches with the contract interface id.
*/
function supportsInterface(bytes4 interfaceID)
external
pure
returns (bool)
{
return
interfaceID == this.supportsInterface.selector || // ERC165
interfaceID == this.parentToken.selector || // parentToken()
interfaceID == this.parentTokenId.selector || // parentTokenId()
interfaceID ==
this.parentToken.selector ^ this.parentTokenId.selector; // RFT
}
/**
* @dev Sets the Address of NFT Contract Address & NFT Token ID
* @param parentNFTContractAddress The address NFT Contract address.
* @param parentNFTTokenId The token id of NFT.
*/
function setParentNFT(
address parentNFTContractAddress,
uint256 parentNFTTokenId,
uint256 totalSupply
) public onlyAdmin {
require(
parentNFTContractAddress != address(0),
"MFNFT::setParentNFT: Parent NFT Contract should not be zero"
);
require(
getTokenId(parentNFTContractAddress, parentNFTTokenId) == 0,
"MFNFT::setParentNFT: Already owned(fractionalized) by this contract"
);
verifyOwnership(parentNFTContractAddress, parentNFTTokenId);
_id++;
_Ids[parentNFTContractAddress][parentNFTTokenId] = _id;
_parentToken[_id] = parentNFTContractAddress;
_parentTokenId[_id] = parentNFTTokenId;
_totalSupply[_id] = totalSupply;
_balances[_id][msg.sender] = totalSupply;
emit TokenAddition(
parentNFTContractAddress,
parentNFTTokenId,
_id,
totalSupply
);
}
/**
* @dev Returns the tokenId of with the given NFT information
* @return An uint256 value representing the tokenId of given NFT
*/
function getTokenId(address token, uint256 tokenId)
public
view
returns (uint256)
{
return _Ids[token][tokenId];
}
/**
* @dev Returns if the NFT is owned(fractionalized) by this contract.
* @return An bool representing whether the NFT is fractionalized by this contract
*/
function isRegistered(address token, uint256 tokenId) public view returns (bool) {
return (_Ids[token][tokenId] != 0);
}
/**
* @dev Returns the Address of Parent Token Address
* @return An Address representing the address of NFT Contract this Re-FT is pointing to.
*/
function parentToken(uint256 tokenId) external view returns (address) {
return _parentToken[tokenId];
}
/**
* @dev Returns the Token ID of NFT
* @return An uint256 representing the token id of the NFT this Re-FT is pointing to.
*/
function parentTokenId(uint256 tokenId) external view returns (uint256) {
return _parentTokenId[tokenId];
}
/**
* @dev Total number of tokens in existence
*/
function totalSupply(uint256 tokenId)
public
view
override
returns (uint256)
{
return _totalSupply[tokenId];
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address owner, uint256 tokenId)
public
view
override
returns (uint256)
{
return _balances[tokenId][owner];
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param owner address The address which owns the funds.
* @param spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(
address owner,
address spender,
uint256 tokenId
) public view override returns (uint256) {
return _allowed[tokenId][owner][spender];
}
/**
* @dev Transfer token for a specified address
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function transfer(
address to,
uint256 tokenId,
uint256 value
) public override returns (bool) {
_transfer(msg.sender, to, tokenId, value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
*/
function approve(
address spender,
uint256 tokenId,
uint256 value
) public override returns (bool) {
require(spender != address(0));
_allowed[tokenId][msg.sender][spender] = value;
emit Approval(msg.sender, spender, tokenId, value);
return true;
}
/**
* @dev Transfer tokens from one address to another.
* Note that while this function emits an Approval event, this is not required as per the specification,
* and other compliant implementations may not emit the event.
* @param from address The address which you want to send tokens from
* @param to address The address which you want to transfer to
* @param value uint256 the amount of tokens to be transferred
*/
function transferFrom(
address from,
address to,
uint256 tokenId,
uint256 value
) public override returns (bool) {
_allowed[tokenId][from][msg.sender] = _allowed[tokenId][from][
msg.sender
].sub(value);
_transfer(from, to, tokenId, value);
emit Approval(
from,
msg.sender,
tokenId,
_allowed[tokenId][from][msg.sender]
);
return true;
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param addedValue The amount of tokens to increase the allowance by.
*/
function increaseAllowance(
address spender,
uint256 tokenId,
uint256 addedValue
) public returns (bool) {
require(spender != address(0));
_allowed[tokenId][msg.sender][spender] = _allowed[tokenId][msg.sender][
spender
].add(addedValue);
emit Approval(
msg.sender,
spender,
tokenId,
_allowed[tokenId][msg.sender][spender]
);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseAllowance(
address spender,
uint256 tokenId,
uint256 subtractedValue
) public returns (bool) {
require(spender != address(0));
_allowed[tokenId][msg.sender][spender] = _allowed[tokenId][msg.sender][
spender
].sub(subtractedValue);
emit Approval(
msg.sender,
spender,
tokenId,
_allowed[tokenId][msg.sender][spender]
);
return true;
}
/**
* @dev Transfer token for a specified addresses
* @param from The address to transfer from.
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function _transfer(
address from,
address to,
uint256 tokenId,
uint256 value
) internal {
require(to != address(0));
_balances[tokenId][from] = _balances[tokenId][from].sub(value);
_balances[tokenId][to] = _balances[tokenId][to].add(value);
emit Transfer(from, to, tokenId, value);
}
}