Cryo Explorer Ethereum Mainnet

pragma solidity 0.8.20;

import {Ownable} from "openzeppelin/access/Ownable.sol";
import {IBlockList} from "../../src/interfaces/ITransferBlockList.sol";

/**
 * @title Blocklist
 * @author Ondo Finance
 * @notice This contract manages the blocklist status for accounts.
 */
contract Blocklist is IBlockList, Ownable {
    constructor(address owner) Ownable(owner) {}

    // {<address> => is account blocked}
    mapping(address => bool) private blockedAddresses;

    /**
     * @notice Function to add a list of accounts to the blocklist
     *
     * @param accounts Array of addresses to block
     */
    function addToBlocklist(address[] calldata accounts) external onlyOwner {
        for (uint256 i; i < accounts.length; ++i) {
            blockedAddresses[accounts[i]] = true;
        }
        emit BlockedAddressesAdded(accounts);
    }

    /**
     * @notice Function to remove a list of accounts from the blocklist
     *
     * @param accounts Array of addresses to unblock
     */
    function removeFromBlocklist(address[] calldata accounts) external onlyOwner {
        for (uint256 i; i < accounts.length; ++i) {
            blockedAddresses[accounts[i]] = false;
        }
        emit BlockedAddressesRemoved(accounts);
    }

    /**
     * @notice Function to check if an account is blocked
     *
     * @param addr Address to check
     *
     * @return True if account is blocked, false otherwise
     */
    function isBlocked(address addr) external view returns (bool) {
        return blockedAddresses[addr];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

// @dev inspired by ONDO-USDY
interface IBlockListClient {
    /// @notice Returns the address of the blocklist that this client setup
    function blocklist() external view returns (address);

    /// @notice Update the blocklist address
    function setBlocklist(address registry) external;

    /// @notice Check if a address is blocked or not
    function isBlocked(address account) external view returns (bool);

    /**
     * @dev Event for when the blocklist reference is set
     * @param oldBlocklist The old blocklist
     * @param newBlocklist The new blocklist
     */
    event BlocklistSet(address oldBlocklist, address newBlocklist);
}

interface IBlockList {
    function addToBlocklist(address[] calldata accounts) external;
    function removeFromBlocklist(address[] calldata accounts) external;
    function isBlocked(address account) external view returns (bool);

    /**
     * @notice Event emitted when addresses are added to the blocklist
     * @param accounts The addresses that were added to the blocklist
     */
    event BlockedAddressesAdded(address[] accounts);

    /**
     * @notice Event emitted when addresses are removed from the blocklist
     * @param accounts The addresses that were removed from the blocklist
     */
    event BlockedAddressesRemoved(address[] accounts);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}