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/*
________/\\\__________________/\\\________/\\\__/\\\\\\\\\\\\\\\__/\\\\\\\\\\\__________________/\\\_______        
 ____/\\\\\\\\\\\_____________\/\\\_____/\\\//__\/\\\///////////__\/////\\\///_______________/\\\\\\\\\\\___       
  __/\\\///\\\////\\___________\/\\\__/\\\//_____\/\\\_________________\/\\\________________/\\\///\\\////\\_      
   _\////\\\\\\__\//____________\/\\\\\\//\\\_____\/\\\\\\\\\\\_________\/\\\_______________\////\\\\\\__\//__     
    ____\////\\\\\\______________\/\\\//_\//\\\____\/\\\///////__________\/\\\__________________\////\\\\\\____    
     __/\\__\/\\\///\\\___________\/\\\____\//\\\___\/\\\_________________\/\\\________________/\\__\/\\\///\\\_   
      _\///\\\\\\\\\\\/____________\/\\\_____\//\\\__\/\\\_________________\/\\\_______________\///\\\\\\\\\\\/__  
       ___\/////\\\///______________\/\\\______\//\\\_\/\\\\\\\\\\\\\\\__/\\\\\\\\\\\_____________\/////\\\///___  
        _______\///__________________\///________\///__\///////////////__\///////////__________________\///________

*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "./dependencies/ERC20.sol";
import "./dependencies/Ownable.sol";

contract KEI is Ownable, ERC20 {
    mapping(address => bool) public whitelisted;
    mapping(address => bool) public whitelistRequested;
    mapping(address => uint256) public requestedWhitelistTimestamp;

    uint8 private constant DECIMALS = 18;
    uint256 public constant TIMELOCK_DURATION = 14 days;

    constructor(address vaultOperations, address stabilityPool) ERC20("KEI Stablecoin", "KEI", DECIMALS) {
        whitelisted[vaultOperations] = true;
        whitelisted[stabilityPool] = true;
    }

    /* --------------- OVERRIDDEN ERC20 LOGIC --------------------- */
    
    /*
     * @notice Transfers tokens from one address to another, with special handling for whitelisted addresses
     * @dev Whitelisted contracts can bypass the allowance check and transfer tokens from other addresses
     * @param from The address to transfer tokens from
     * @param to The address to transfer tokens to
     * @param amount The amount of tokens to transfer
     * @return bool Returns true if the transfer was successful
    */
    function transferFrom(address from, address to, uint256 amount) public override returns (bool) {
        if (whitelisted[msg.sender]) {
            // For whitelisted addresses, we bypass allowance checking
            balanceOf[from] -= amount;
            unchecked {
                balanceOf[to] += amount;
            }
            emit Transfer(from, to, amount);
            return true;
        } else {
            // Uses the standard ERC20 transferFrom for others
            return super.transferFrom(from, to, amount);
        }
    }

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

    function mint(address recipient, uint256 amount) public {
        require(whitelisted[msg.sender], "Not whitelisted to mint");
        _mint(recipient, amount);
    }

    function burn(address from, uint256 amount) public {
        require(whitelisted[msg.sender], "Not whitelisted to burn");
        _burn(from, amount);
    }

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

    /*
     * @notice Initiates a request to whitelist an address by starting the timelock period
     * @notice Given the admin key retains the ability to add debttoken minters for future 
               deployments or upgrades a long timelock (14d) is established.
     * @param _address The address to be considered for whitelisting
     * @dev Can only be called by the contract owner
    */
    function requestWhitelist(address _address) external onlyOwner {
        require(!whitelisted[_address], "Address already whitelisted");

        whitelistRequested[_address] = true;
        requestedWhitelistTimestamp[_address] = block.timestamp;
        emit WhitelistRequested(_address, block.timestamp);
    }

    /*
     * @notice Adds an address to the whitelist after the timelock period has passed
     * @param _address The address to be added to the whitelist
     * @dev Can only be called by the contract owner
    */
    function addWhitelist(address _address) external onlyOwner {
        require(!whitelisted[_address], "Address already whitelisted");
        require(whitelistRequested[_address], "Whitelist not requested");
        require(block.timestamp > requestedWhitelistTimestamp[_address] + TIMELOCK_DURATION, "Timelock period has not passed");

        whitelisted[_address] = true;
        delete requestedWhitelistTimestamp[_address];
        emit WhitelistChanged(_address, true);
    }

    /*
     * @notice Removes an address from the whitelist
     * @param _address The address to be removed from the whitelist
     * @dev Can only be called by the contract owner
    */
    function removeWhitelist(address _address) external onlyOwner {
        whitelistRequested[_address] = false;
        whitelisted[_address] = false;
        emit WhitelistChanged(_address, false);
    }

    /*
     * @notice Checks if an address is whitelisted
     * @param addy The address to check
     * @return bool Returns true if the address is whitelisted, false otherwise
    */
    function isWhitelisted(address _address) external view returns (bool) {
        return whitelisted[_address];
    }

    event WhitelistChanged(address indexed _address, bool _status);
    event WhitelistRequested(address indexed _address, uint256 _timestamp);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.19;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;
    string public symbol;
    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;
    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

import "./Context.sol";

abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "appendCBOR": false,
    "bytecodeHash": "none",
    "useLiteralContent": false
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "viaIR": true
}

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"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelistRequested","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelisted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000067e70761e88c77fff2174d5a4ead42b44df3f64a000000000000000000000000b22f7b5d5724b1a454d6811456c85491c1bb249b

-----Decoded View---------------
Arg [0] : vaultOperations (address): 0x67e70761E88C77ffF2174d5a4EaD42B44Df3F64a
Arg [1] : stabilityPool (address): 0xb22f7B5d5724B1a454d6811456C85491C1BB249b

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000067e70761e88c77fff2174d5a4ead42b44df3f64a
Arg [1] : 000000000000000000000000b22f7b5d5724b1a454d6811456c85491c1bb249b