Contract 0x4f182fc7ef3e2928f0b82e3eb3900d70743de6ef

/**
 *Submitted for verification at polygonscan.com on 2022-07-18
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

/**
 * @title FileRegistry for GhostShare.xyz
 * @author Joris Zierold
 * @dev Main contract, which handles file tracing and access control.
 */
contract FileRegistry {
    /* ------------------------------ DATA STORAGE ------------------------------ */
    struct File {
        address fileOwner;
        mapping(address => bool) accessRights;
    }

    mapping(bytes32 => File) public files;

    /* --------------------------------- EVENTS --------------------------------- */
    event FileRegistered(bytes32 fileId, address indexed fileOwner);
    event AccessGranted(bytes32 fileId, address indexed recipient);
    event AccessRevoked(bytes32 fileId, address indexed recipient);

    /* -------------------------------- MODIFIERS ------------------------------- */
    modifier onlyFileOwner(bytes32 fileId) {
        // requre msg.sender is owner of fileId
        require(
            files[fileId].fileOwner == msg.sender,
            "FileRegistry::onlyFileOwner: You do not have access."
        );
        _;
    }

    /* -------------------------------------------------------------------------- */
    /*                                  FUNCTIONS                                 */
    /* -------------------------------------------------------------------------- */

    function registerFile(bytes32 fileId) public returns (bool fileRegistered) {
        require(
            files[fileId].fileOwner == address(0),
            "FileRegistry::registerFile: File already exists."
        );
        files[fileId].fileOwner = msg.sender;
        files[fileId].accessRights[msg.sender] = true;
        emit FileRegistered(fileId, msg.sender);
        return true;
    }

    function grantAccess(bytes32 fileId, address recipient)
        public
        onlyFileOwner(fileId)
        returns (bool accessGranted)
    {
        require(
            !files[fileId].accessRights[recipient],
            "FileRegistry::grantAccess: Recipient is already granted."
        );
        files[fileId].accessRights[recipient] = true;
        emit AccessGranted(fileId, recipient);
        return true;
    }

    function revokeAccess(bytes32 fileId, address recipient)
        public
        onlyFileOwner(fileId)
        returns (bool accessRevoked)
    {
        require(
            files[fileId].accessRights[recipient],
            "FileRegistry::revokeAccess: No access is granted to this Recipient."
        );
        files[fileId].accessRights[recipient] = false;
        emit AccessRevoked(fileId, recipient);
        return true;
    }

    function hasAccess(bytes32 fileId, address recipient)
        public
        view
        returns (bool _hasAccess)
    {
        return files[fileId].accessRights[recipient];
    }
}

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"fileId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"}],"name":"AccessGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"fileId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"}],"name":"AccessRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"fileId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"fileOwner","type":"address"}],"name":"FileRegistered","type":"event"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"files","outputs":[{"internalType":"address","name":"fileOwner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"fileId","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"}],"name":"grantAccess","outputs":[{"internalType":"bool","name":"accessGranted","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"fileId","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"}],"name":"hasAccess","outputs":[{"internalType":"bool","name":"_hasAccess","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"fileId","type":"bytes32"}],"name":"registerFile","outputs":[{"internalType":"bool","name":"fileRegistered","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"fileId","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"}],"name":"revokeAccess","outputs":[{"internalType":"bool","name":"accessRevoked","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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ipfs://f7e664d1ef744a6487278d1a82d9b7becd749b6ccdf96c431a573913bf074c56