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Agreements.sol

// "SPDX-License-Identifier: UNLICENSED"

pragma solidity 0.7.3;

contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract AgreementStore is Ownable {
    
    struct AgreementData{
        uint256 kind;
        string uuid;
        string user1;
        string user2;
    }
    
    uint256 private cnt;
    
    mapping (uint256 => AgreementData) private _agreements;
    
    event AgreementCreated(uint256 indexed id, uint256 kind, string uuid, string user1, string user2);
    
    function createAgreement(uint256 _kind, string calldata _uuid, string calldata _user1, string calldata _user2) external {
        require (_kind != 0, "Agreement kind cannot be zero");
    
        uint256 id = cnt;
        _agreements[id] = AgreementData(_kind, _uuid, _user1, _user2);
        cnt++;
        
        emit AgreementCreated(id, _kind, _uuid, _user1, _user2);
    }
    
    function getAgreement(uint256 id) external view returns (uint256 kind, string memory uuid, string memory user1, string memory user2) {
        return (_agreements[id].kind, _agreements[id].uuid, _agreements[id].user1, _agreements[id].user2);
    }
}