/**
 *Submitted for verification at Etherscan.io on 2022-04-11
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;

/**
 * @title Represents an ownable resource.
 */
contract Ownable {
    address internal _owner;

    event OwnershipTransferred(address previousOwner, address newOwner);

    /**
     * Constructor
     * @param addr The owner of the smart contract
     */
    constructor (address addr) {
        require(addr != address(0), "non-zero address required");
        require(addr != address(1), "ecrecover address not allowed");
        _owner = addr;
        emit OwnershipTransferred(address(0), addr);
    }

    /**
     * @notice This modifier indicates that the function can only be called by the owner.
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(msg.sender), "Only owner requirement");
        _;
    }

    /**
     * @notice Transfers ownership to the address specified.
     * @param addr Specifies the address of the new owner.
     * @dev Throws if called by any account other than the owner.
     */
    function transferOwnership (address addr) public onlyOwner {
        require(addr != address(0), "non-zero address required");
        emit OwnershipTransferred(_owner, addr);
        _owner = addr;
    }

    /**
     * @notice Destroys the smart contract.
     * @param addr The payable address of the recipient.
     */
    function destroy(address payable addr) public virtual onlyOwner {
        require(addr != address(0), "non-zero address required");
        require(addr != address(1), "ecrecover address not allowed");
        selfdestruct(addr);
    }

    /**
     * @notice Gets the address of the owner.
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @notice Indicates if the address specified is the owner of the resource.
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner(address addr) public view returns (bool) {
        return addr == _owner;
    }
}

/**
 * @notice Defines the interface for whitelisting addresses.
 */
interface IAddressWhitelist {
    /**
     * @notice Whitelists the address specified.
     * @param addr The address to enable
     */
    function enableAddress (address addr) external;

    /**
     * @notice Disables the address specified.
     * @param addr The address to disable
     */
    function disableAddress (address addr) external;

    /**
     * @notice Indicates if the address is whitelisted or not.
     * @param addr The address to disable
     * @return Returns 1 if the address is whitelisted
     */
    function isWhitelistedAddress (address addr) external view returns (bool);

    /**
     * This event is triggered when a new address is whitelisted.
     * @param addr The address that was whitelisted
     */
    event OnAddressEnabled(address addr);

    /**
     * This event is triggered when an address is disabled.
     * @param addr The address that was disabled
     */
    event OnAddressDisabled(address addr);
}


/**
 * @title Contract for whitelisting addresses
 */
contract AddressWhitelist is IAddressWhitelist, Ownable {
    mapping (address => bool) internal whitelistedAddresses;

    /**
     * @notice Constructor.
     * @param ownerAddr The address of the owner
     */
    constructor (address ownerAddr) Ownable (ownerAddr) { // solhint-disable-line no-empty-blocks
    }

    /**
     * @notice Whitelists the address specified.
     * @param addr The address to enable
     */
    function enableAddress (address addr) public override onlyOwner {
        require(!whitelistedAddresses[addr], "Already enabled");
        whitelistedAddresses[addr] = true;
        emit OnAddressEnabled(addr);
    }

    /**
     * @notice Disables the address specified.
     * @param addr The address to disable
     */
    function disableAddress (address addr) public override onlyOwner {
        require(whitelistedAddresses[addr], "Already disabled");
        whitelistedAddresses[addr] = false;
        emit OnAddressDisabled(addr);
    }

    /**
     * @notice Indicates if the address is whitelisted or not.
     * @param addr The address to disable
     * @return Returns true if the address is whitelisted
     */
    function isWhitelistedAddress (address addr) public view override returns (bool) {
        return whitelistedAddresses[addr];
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"ownerAddr","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"addr","type":"address"}],"name":"OnAddressDisabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"addr","type":"address"}],"name":"OnAddressEnabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address payable","name":"addr","type":"address"}],"name":"destroy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"disableAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"enableAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"isWhitelistedAddress","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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