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AccessControlListContract.sol

pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;

contract AccessControlListContract {
    mapping(address => mapping(uint256 => mapping(address => uint256))) _userAccessGrants;
    mapping(address => mapping(address => mapping(uint256 => uint256))) _targetAccessGrants;

    function grantAccess(address userAddress, uint256 documentHash, address targetUserAddress, uint256 permission) public {
        _userAccessGrants[userAddress][documentHash][targetUserAddress] = permission; 
        _targetAccessGrants[targetUserAddress][userAddress][documentHash] = permission;       
    }

    function checkAccess(address requestorAddress, address userAddress, uint256 documentHash) public view returns (uint256) {
        return _targetAccessGrants[requestorAddress][userAddress][documentHash];
    }
}