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Contract Source Code:
File 1 of 1 : SimpleWriteAccessController
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @title The Owned contract * @notice A contract with helpers for basic contract ownership. */ contract Owned { address public owner; address private pendingOwner; event OwnershipTransferRequested( address indexed from, address indexed to ); event OwnershipTransferred( address indexed from, address indexed to ); constructor() public { owner = msg.sender; } /** * @dev Allows an owner to begin transferring ownership to a new address, * pending. */ function transferOwnership(address _to) external onlyOwner() { pendingOwner = _to; emit OwnershipTransferRequested(owner, _to); } /** * @dev Allows an ownership transfer to be completed by the recipient. */ function acceptOwnership() external { require(msg.sender == pendingOwner, "Must be proposed owner"); address oldOwner = owner; owner = msg.sender; pendingOwner = address(0); emit OwnershipTransferred(oldOwner, msg.sender); } /** * @dev Reverts if called by anyone other than the contract owner. */ modifier onlyOwner() { require(msg.sender == owner, "Only callable by owner"); _; } } interface AccessControllerInterface { function hasAccess(address user, bytes calldata data) external view returns (bool); } /** * @title SimpleWriteAccessController * @notice Gives access to accounts explicitly added to an access list by the * controller's owner. * @dev does not make any special permissions for externally, see * SimpleReadAccessController for that. */ contract SimpleWriteAccessController is AccessControllerInterface, Owned { bool public checkEnabled; mapping(address => bool) internal accessList; event AddedAccess(address user); event RemovedAccess(address user); event CheckAccessEnabled(); event CheckAccessDisabled(); constructor() public { checkEnabled = true; } /** * @notice Returns the access of an address * @param _user The address to query */ function hasAccess( address _user, bytes memory ) public view virtual override returns (bool) { return accessList[_user] || !checkEnabled; } /** * @notice Adds an address to the access list * @param _user The address to add */ function addAccess(address _user) external onlyOwner() { if (!accessList[_user]) { accessList[_user] = true; emit AddedAccess(_user); } } /** * @notice Removes an address from the access list * @param _user The address to remove */ function removeAccess(address _user) external onlyOwner() { if (accessList[_user]) { accessList[_user] = false; emit RemovedAccess(_user); } } /** * @notice makes the access check enforced */ function enableAccessCheck() external onlyOwner() { if (!checkEnabled) { checkEnabled = true; emit CheckAccessEnabled(); } } /** * @notice makes the access check unenforced */ function disableAccessCheck() external onlyOwner() { if (checkEnabled) { checkEnabled = false; emit CheckAccessDisabled(); } } /** * @dev reverts if the caller does not have access */ modifier checkAccess() { require(hasAccess(msg.sender, msg.data), "No access"); _; } }
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