273 lines
12 KiB
Solidity
273 lines
12 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 "./smartNFT_interface.sol";
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import "./ERC721_interface.sol";
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contract smartNFT_SC is ERC721,smartNFT{
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enum States { waitingForOwner, engagedWithOwner, waitingForUser, engagedWithUser }
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address manufacturer; //Address of manufacturer and owner of Smart Contract
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uint256 tokenCounter; //To give a genuine tokenID based on the number of tokens created
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mapping(uint256 => address) ownerOfSD; //To khow who is the owner of a specific owner
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mapping(address => uint256) tokenIDOfBCA; //To khow which is the tokenID associated to a secure device from the address
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mapping(address => uint256) ownerBalance; //To know how many tokens an owner has
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mapping(address => uint256) userBalance; //To know how many tokens a user can use
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struct Token_Struct{
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address approved; //Indicate who can transfer this token, 0 if no one
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address SD; //Indicate the address of the secure device associated to this token
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address user; //Indicate who can use this secure device
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States state; //If blocked (false) then token should be verified by a new user or a new owner
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uint256 hashK_OD; //Hash of the Key shared between owner and device
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uint256 hashK_UD; //Hash of the Key shared between user and device
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uint256 dataEngagement; //Public Key to create K_OD or K_UD depending on token state
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uint256 timestamp; //Last time that device updated its proof of live
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uint256 timeout; //timeout to verify a device error
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}
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Token_Struct[] Secure_Token;
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constructor() {
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manufacturer = msg.sender;
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tokenCounter = 1;
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Secure_Token.push(Token_Struct(address(0), address(0), address(0), States.waitingForOwner,0,0,0,0,0));
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}
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function createToken(address _addressSD, address _addressOwner) public virtual override returns (uint256){
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//Check if the sender of message is the manufacturer
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require(manufacturer == msg.sender);
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//Check if the Blockchain Account of the secure device is in the SmartContract
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if(tokenFromBCA(_addressSD)==0){
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//Create a new token
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Secure_Token.push(Token_Struct(address(0), _addressSD, address(0), States.waitingForOwner,0,0,0,block.timestamp,86400));
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//Assigning a new tokenId
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uint256 _tokenId = tokenCounter ++;
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tokenIDOfBCA[_addressSD] = _tokenId;
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//Assigning the owner
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ownerOfSD[_tokenId] = _addressOwner;
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ownerBalance[_addressOwner]++;
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//Return tokenId obtained
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return(_tokenId);
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}else{
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//If the BCA already exists then return the _tokenId
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return(tokenFromBCA(_addressSD));
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}
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}
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function setUser(uint256 _tokenId, address _addressUser) public virtual override{
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//Check the sender and the token state
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require((ownerOfSD[_tokenId] == msg.sender) && (Secure_Token[_tokenId].state >= States.engagedWithOwner));
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if((Secure_Token[_tokenId].timestamp + Secure_Token[_tokenId].timeout) > block.timestamp){
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//Only to avoid overflow, for example, in address 0.
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if(userBalance[Secure_Token[_tokenId].user]>0){
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//Update the balance of tokens assigned to the old user
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userBalance[Secure_Token[_tokenId].user]--;
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}
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//Update the balance of tokens assigned to the new user
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userBalance[_addressUser]++;
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//Assign the new user to the token
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Secure_Token[_tokenId].user = _addressUser;
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//Update the state of the token
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Secure_Token[_tokenId].state = States.waitingForUser;
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//Erase old key exchange data between device with old user assigned
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Secure_Token[_tokenId].dataEngagement =0;
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Secure_Token[_tokenId].hashK_UD = 0;
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emit UserAssigned(_tokenId,_addressUser);
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}else{
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Secure_Token[_tokenId].user = address(0);
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emit TimeoutAlarm(_tokenId);
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}
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}
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function startOwnerEngagement(uint256 _tokenId, uint256 _dataEngagement, uint256 _hashK_O) public virtual override{
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//Check if sender is the Owner of token and the State of token
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require(ownerOfSD[_tokenId] == msg.sender);
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if((Secure_Token[_tokenId].timestamp + Secure_Token[_tokenId].timeout) > block.timestamp){
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Secure_Token[_tokenId].dataEngagement = _dataEngagement;
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Secure_Token[_tokenId].hashK_OD = _hashK_O;
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}else{
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Secure_Token[_tokenId].user = address(0);
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emit TimeoutAlarm(_tokenId);
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}
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}
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function ownerEngagement(uint256 _hashK_D) public virtual override{
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uint256 _tokenId = tokenFromBCA(msg.sender);
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//Check if public key owner-device exists from tokenID of BCA sender
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require(Secure_Token[_tokenId].dataEngagement != 0);
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require (Secure_Token[_tokenId].hashK_OD == _hashK_D);
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require (Secure_Token[_tokenId].state == States.waitingForOwner);
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//Erase PK_Owner-Device and update timestamp
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Secure_Token[_tokenId].dataEngagement = 0;
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Secure_Token[_tokenId].timestamp = block.timestamp;
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//Update the state of token
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Secure_Token[_tokenId].state = States.engagedWithOwner;
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//Send a notification to owner and device
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emit OwnerEngaged(_tokenId);
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}
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function startUserEngagement(uint256 _tokenId, uint256 _dataEngagement, uint256 _hashK_U) public virtual override{
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//Check the sender and the state of token
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require(Secure_Token[_tokenId].user == msg.sender);
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if((Secure_Token[_tokenId].timestamp + Secure_Token[_tokenId].timeout) > block.timestamp){
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Secure_Token[_tokenId].dataEngagement = _dataEngagement;
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Secure_Token[_tokenId].hashK_UD = _hashK_U;
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}else{
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Secure_Token[_tokenId].user = address(0);
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emit TimeoutAlarm(_tokenId);
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}
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}
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function userEngagement(uint256 _hashK_D) public virtual override{
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uint256 _tokenId = tokenFromBCA(msg.sender);
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//Check if public key user-device exists from tokenID of BCA sender
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require(Secure_Token[_tokenId].dataEngagement != 0);
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require (Secure_Token[_tokenId].hashK_UD == _hashK_D);
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require (Secure_Token[_tokenId].state == States.waitingForUser);
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//Erase PK_User-Device and update timestamp
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Secure_Token[_tokenId].dataEngagement = 0;
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Secure_Token[_tokenId].timestamp = block.timestamp;
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//Update the state of token
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Secure_Token[_tokenId].state = States.engagedWithUser;
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//Send a notification to user and device
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emit UserEngaged(_tokenId);
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}
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function tokenFromBCA(address _addressSD) public virtual view override returns (uint256){
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return(tokenIDOfBCA[_addressSD]);
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}
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function ownerOfFromBCA(address _addressSD) public virtual view override returns (address){
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return(ownerOfSD[tokenIDOfBCA[_addressSD]]);
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}
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function userOf(uint256 _tokenId) public virtual view override returns (address){
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return(Secure_Token[_tokenId].user);
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}
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function userOfFromBCA(address _addressSD) public virtual override view returns (address){
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return(Secure_Token[tokenIDOfBCA[_addressSD]].user);
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}
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function userBalanceOf(address _addressUser) public virtual override view returns (uint256){
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return(userBalance[_addressUser]);
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}
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function userBalanceOfAnOwner(address _addressUser, address _addressOwner) public virtual override view returns (uint256){
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//TODO
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}
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function getInfoToken(uint256 _tokenId) public view returns ( address _BCA_OWNER,
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address _BCA_USER,
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address _BCA_SD,
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uint8 _state){
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_BCA_OWNER = ownerOfSD[_tokenId];
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_BCA_USER = Secure_Token[_tokenId].user;
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_BCA_SD = Secure_Token[_tokenId].SD;
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if(Secure_Token[_tokenId].state == States.waitingForOwner){
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_state = 0;
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}else if(Secure_Token[_tokenId].state == States.engagedWithOwner){
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_state = 1;
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}else if(Secure_Token[_tokenId].state == States.waitingForUser){
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_state = 2;
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}else {
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_state = 3;
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}
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}
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function getInfoTokenFromBCA(address _addressSD) public view returns ( address _BCA_OWNER,
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address _BCA_USER,
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uint256 _tokenId,
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uint8 _state){
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_tokenId = tokenIDOfBCA[_addressSD];
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_BCA_OWNER = ownerOfSD[_tokenId];
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_BCA_USER = Secure_Token[_tokenId].user;
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if(Secure_Token[_tokenId].state == States.waitingForOwner){
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_state = 0;
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}else if(Secure_Token[_tokenId].state == States.engagedWithOwner){
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_state = 1;
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}else if(Secure_Token[_tokenId].state == States.waitingForUser){
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_state = 2;
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}else {
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_state = 3;
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}
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}
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function balanceOf(address _owner) public virtual override view returns (uint256){
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return(ownerBalance[_owner]);
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}
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function ownerOf(uint256 _tokenId) public virtual override view returns (address){
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return(ownerOfSD[_tokenId]);
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}
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function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes memory data) public virtual override payable{
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}
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function safeTransferFrom(address _from, address _to, uint256 _tokenId) public virtual override payable{
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transferFrom(_from, _to, _tokenId);
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}
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function transferFrom(address _from, address _to, uint256 _tokenId) public virtual override payable{
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require((ownerOfSD[_tokenId] == msg.sender)||(Secure_Token[_tokenId].approved == msg.sender));
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require(ownerOfSD[_tokenId] == _from);
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if((Secure_Token[_tokenId].timestamp + Secure_Token[_tokenId].timeout) > block.timestamp){
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ownerOfSD[_tokenId] = _to;
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ownerBalance[_from]--;
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ownerBalance[_to]++;
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//Secure_Token[_tokenId].approved = address(0);
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Secure_Token[_tokenId].user = address(0);
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Secure_Token[_tokenId].state = States.waitingForOwner;
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//Erase old key exchange data between device with old Owner
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Secure_Token[_tokenId].dataEngagement = 0;
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Secure_Token[_tokenId].hashK_UD = 0;
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Secure_Token[_tokenId].hashK_OD = 0;
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emit Transfer(_from,_to,_tokenId);
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}else{
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Secure_Token[_tokenId].user = address(0);
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emit TimeoutAlarm(_tokenId);
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}
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}
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function approve(address _approved, uint256 _tokenId) public virtual override payable{
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}
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function setApprovalForAll(address _operator, bool _approved) public virtual override{
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}
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function getApproved(uint256 _tokenId) public virtual override view returns (address){
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}
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function isApprovedForAll(address _owner, address _operator) public virtual override view returns (bool){
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}
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function checkTimeout(uint256 _tokenId) public virtual override returns (bool){
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require(ownerOfSD[_tokenId] == msg.sender);
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if((Secure_Token[_tokenId].timestamp + Secure_Token[_tokenId].timeout) > block.timestamp){
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return true;
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}else{
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Secure_Token[_tokenId].user = address(0);
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emit TimeoutAlarm(_tokenId);
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return false;
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}
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}
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function updateTimestamp() public virtual override{
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Secure_Token[tokenFromBCA(msg.sender)].timestamp = block.timestamp;
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}
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function setTimeout(uint256 _tokenId, uint256 _timeout) public virtual override{
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require(ownerOfSD[_tokenId] == msg.sender);
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Secure_Token[_tokenId].timeout = _timeout;
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}
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}
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