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// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

import "./Interfaces/IEBTCToken.sol";

import "./Dependencies/AuthNoOwner.sol";
import "./Dependencies/PermitNonce.sol";

/*
 *
 * Based upon OpenZeppelin's ERC20 contract:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol
 *
 * and their EIP2612 (ERC20Permit / ERC712) functionality:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/53516bc555a454862470e7860a9b5254db4d00f5/contracts/token/ERC20/ERC20Permit.sol
 *
 *
 * --- Functionality added specific to the EBTCToken ---
 *
 * 1) Transfer protection: blocklist of addresses that are invalid recipients (i.e. core Ebtc contracts) in external transfer() and transferFrom() calls.
 * The purpose is to protect users from losing tokens by mistakenly sending EBTC directly to a Liquity.
 * core contract, when they should rather call the right function.
 */

contract EBTCToken is IEBTCToken, AuthNoOwner, PermitNonce {
    uint256 private _totalSupply;
    string internal constant _NAME = "eBTC";
    string internal constant _SYMBOL = "EBTC";
    string internal constant _VERSION = "1";
    uint8 internal constant _DECIMALS = 18;

    // --- Data for EIP2612 ---

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 private constant _PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
    bytes32 private constant _TYPE_HASH =
        0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;

    // User data for EBTC token
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    // --- Addresses ---
    address public immutable cdpManagerAddress;
    address public immutable borrowerOperationsAddress;

    /// @param _cdpManagerAddress Address of the CDP Manager
    /// @param _borrowerOperationsAddress Address of the Borrower Operations
    /// @param _authorityAddress Address of the authority for the contract
    constructor(
        address _cdpManagerAddress,
        address _borrowerOperationsAddress,
        address _authorityAddress
    ) {
        _initializeAuthority(_authorityAddress);

        cdpManagerAddress = _cdpManagerAddress;
        borrowerOperationsAddress = _borrowerOperationsAddress;

        bytes32 hashedName = keccak256(bytes(_NAME));
        bytes32 hashedVersion = keccak256(bytes(_VERSION));

        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = _chainID();
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(_TYPE_HASH, hashedName, hashedVersion);
    }

    /// @notice Mint new tokens
    /// @dev Internal system function - only callable by BorrowerOperations or CDPManager
    /// @dev Governance can also expand the list of approved minters to enable other systems to mint tokens
    /// @param _account The address to receive the newly minted tokens
    /// @param _amount The amount of tokens to mint
    function mint(address _account, uint256 _amount) external override {
        _requireCallerIsBOorCdpMOrAuth();
        _mint(_account, _amount);
    }

    /// @notice Burn existing tokens
    /// @dev Internal system function - only callable by BorrowerOperations or CDPManager
    /// @dev Governance can also expand the list of approved burners to enable other systems to burn tokens
    /// @param _account The address to burn tokens from
    /// @param _amount The amount of tokens to burn
    function burn(address _account, uint256 _amount) external override {
        _requireCallerIsBOorCdpMOrAuth();
        _burn(_account, _amount);
    }

    /// @notice Burn existing tokens from caller
    /// @dev Internal system function - only callable by BorrowerOperations or CDPManager
    /// @dev Governance can also expand the list of approved burners to enable other systems to burn tokens
    /// @param _amount The amount of tokens to burn
    function burn(uint256 _amount) external {
        _requireCallerIsBOorCdpMOrAuth();
        _burn(msg.sender, _amount);
    }

    // --- External functions ---

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        _requireValidRecipient(recipient);
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) external view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        _requireValidRecipient(recipient);
        _transfer(sender, recipient, amount);

        uint256 cachedAllowance = _allowances[sender][msg.sender];
        if (cachedAllowance != type(uint256).max) {
            require(cachedAllowance >= amount, "ERC20: transfer amount exceeds allowance");
            unchecked {
                _approve(sender, msg.sender, cachedAllowance - amount);
            }
        }
        return true;
    }

    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) external override returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) external override returns (bool) {
        uint256 cachedAllowances = _allowances[msg.sender][spender];
        require(cachedAllowances >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(msg.sender, spender, cachedAllowances - subtractedValue);
        }
        return true;
    }

    // --- EIP 2612 Functionality (https://eips.ethereum.org/EIPS/eip-2612) ---

    /// @notice This function returns the domain separator for current chain
    /// @return EIP712 compatible Domain definition
    function DOMAIN_SEPARATOR() external view returns (bytes32) {
        return domainSeparator();
    }

    /// @notice This function returns the domain separator for current chain
    /// @return EIP712 compatible Domain definition
    function domainSeparator() public view override returns (bytes32) {
        if (_chainID() == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    /// @notice This function approve given amount for specified owner and spender
    /// @notice by verifying the validity of given deadline and signature parameters (v, r, s).
    /// @param owner The token owner
    /// @param spender The consumer to which owner want to grant approval
    /// @param amount The token expenditure budget to be set
    /// @param deadline The permit valid deadline
    /// @param v The v part of signature from owner
    /// @param r The r part of signature from owner
    /// @param s The s part of signature from owner
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(deadline >= block.timestamp, "EBTC: expired deadline");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator(),
                keccak256(
                    abi.encode(_PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner]++, deadline)
                )
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress == owner, "EBTC: invalid signature");
        _approve(owner, spender, amount);
    }

    /// @dev Return current nonce for specified owner fOR EIP-2612 compatibility
    /// @param owner The address whose nonce to be queried
    function nonces(address owner) external view override(IERC2612, PermitNonce) returns (uint256) {
        return _nonces[owner];
    }

    // --- Internal operations ---

    function _chainID() private view returns (uint256) {
        return block.chainid;
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 name,
        bytes32 version
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, name, version, _chainID(), address(this)));
    }

    // --- Internal operations ---
    // Warning: sanity checks (for sender and recipient) should have been done before calling these internal functions

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "EBTCToken: zero sender!");
        require(recipient != address(0), "EBTCToken: zero recipient!");

        uint256 cachedSenderBalances = _balances[sender];
        require(cachedSenderBalances >= amount, "ERC20: transfer amount exceeds balance");

        unchecked {
            // Safe because of the check above
            _balances[sender] = cachedSenderBalances - amount;
        }

        _balances[recipient] = _balances[recipient] + amount;
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "EBTCToken: mint to zero recipient!");

        _totalSupply = _totalSupply + amount;
        _balances[account] = _balances[account] + amount;
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "EBTCToken: burn from zero account!");

        uint256 cachedBalance = _balances[account];
        require(cachedBalance >= amount, "ERC20: burn amount exceeds balance");

        unchecked {
            // Safe because of the check above
            _balances[account] = cachedBalance - amount;
        }

        _totalSupply = _totalSupply - amount;
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "EBTCToken: zero approve owner!");
        require(spender != address(0), "EBTCToken: zero approve spender!");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    // --- 'require' functions ---

    function _requireValidRecipient(address _recipient) internal view {
        require(
            _recipient != address(0) && _recipient != address(this),
            "EBTC: Cannot transfer tokens directly to the EBTC token contract or the zero address"
        );
        require(
            _recipient != cdpManagerAddress && _recipient != borrowerOperationsAddress,
            "EBTC: Cannot transfer tokens directly to the CdpManager or BorrowerOps"
        );
    }

    function _requireCallerIsBorrowerOperations() internal view {
        require(
            msg.sender == borrowerOperationsAddress,
            "EBTCToken: Caller is not BorrowerOperations"
        );
    }

    /// @dev authority check last to short-circuit in the case of use by usual immutable addresses
    function _requireCallerIsBOorCdpMOrAuth() internal view {
        require(
            msg.sender == borrowerOperationsAddress ||
                msg.sender == cdpManagerAddress ||
                isAuthorized(msg.sender, msg.sig),
            "EBTC: Caller is neither BorrowerOperations nor CdpManager nor authorized"
        );
    }

    function _requireCallerIsCdpM() internal view {
        require(msg.sender == cdpManagerAddress, "EBTC: Caller is not CdpManager");
    }

    // --- Optional functions ---

    /// @notice Returns the name of the token
    /// @return Name of the token
    function name() external pure override returns (string memory) {
        return _NAME;
    }

    /// @notice Returns the symbol of the token
    /// @return Symbol of the token
    function symbol() external pure override returns (string memory) {
        return _SYMBOL;
    }

    /// @notice Returns the number of decimals used to represent token amounts
    /// @return Number of decimals used by the token
    function decimals() external pure override returns (uint8) {
        return _DECIMALS;
    }

    /// @notice Returns the version of the token
    /// @return Version of the token
    function version() external pure override returns (string memory) {
        return _VERSION;
    }

    /// @notice Returns the type hash used for permit() function as per EIP-2612
    /// @return EIP-2612 permit type hash
    function permitTypeHash() external pure override returns (bytes32) {
        return _PERMIT_TYPEHASH;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.17;

import {Authority} from "./Authority.sol";

/// @notice Provides a flexible and updatable auth pattern which is completely separate from application logic.
/// @author Modified by BadgerDAO to remove owner
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Auth.sol)
/// @author Modified from Dappsys (https://github.com/dapphub/ds-auth/blob/master/src/auth.sol)
contract AuthNoOwner {
    event AuthorityUpdated(address indexed user, Authority indexed newAuthority);

    Authority private _authority;
    bool private _authorityInitialized;

    modifier requiresAuth() virtual {
        require(isAuthorized(msg.sender, msg.sig), "Auth: UNAUTHORIZED");

        _;
    }

    function authority() public view returns (Authority) {
        return _authority;
    }

    function authorityInitialized() public view returns (bool) {
        return _authorityInitialized;
    }

    function isAuthorized(address user, bytes4 functionSig) internal view virtual returns (bool) {
        Authority auth = _authority; // Memoizing authority saves us a warm SLOAD, around 100 gas.

        // Checking if the caller is the owner only after calling the authority saves gas in most cases, but be
        // aware that this makes protected functions uncallable even to the owner if the authority is out of order.
        return (address(auth) != address(0) && auth.canCall(user, address(this), functionSig));
    }

    /// @notice Changed constructor to initialize to allow flexiblity of constructor vs initializer use
    /// @notice sets authorityInitiailzed flag to ensure only one use of
    function _initializeAuthority(address newAuthority) internal {
        require(address(_authority) == address(0), "Auth: authority is non-zero");
        require(!_authorityInitialized, "Auth: authority already initialized");

        _authority = Authority(newAuthority);
        _authorityInitialized = true;

        emit AuthorityUpdated(address(this), Authority(newAuthority));
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.17;

/// @notice A generic interface for a contract which provides authorization data to an Auth instance.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Auth.sol)
/// @author Modified from Dappsys (https://github.com/dapphub/ds-auth/blob/master/src/auth.sol)
interface Authority {
    function canCall(address user, address target, bytes4 functionSig) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

/**
 * Based on the OpenZeppelin IER20 interface:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol
 *
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

/**
 * @dev Interface of the ERC2612 standard as defined in the EIP.
 *
 * Adds the {permit} method, which can be used to change one's
 * {IERC20-allowance} without having to send a transaction, by signing a
 * message. This allows users to spend tokens without having to hold Ether.
 *
 * See https://eips.ethereum.org/EIPS/eip-2612.
 *
 * Code adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2237/
 */
interface IERC2612 {
    /**
     * @dev Sets `amount` as the allowance of `spender` over `owner`'s tokens,
     * given `owner`'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current ERC2612 nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases `owner`'s nonce by one. This
     * prevents a signature from being used multiple times.
     *
     * `owner` can limit the time a Permit is valid for by setting `deadline` to
     * a value in the near future. The deadline argument can be set to uint256(-1) to
     * create Permits that effectively never expire.
     */
    function nonces(address owner) external view returns (uint256);

    function version() external view returns (string memory);

    function permitTypeHash() external view returns (bytes32);

    function domainSeparator() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;
import "../Interfaces/IPermitNonce.sol";

/**
 * @dev This abstract contract provides a mapping from address to nonce (uint256) used for permit signature
 */
contract PermitNonce is IPermitNonce {
    mapping(address => uint256) internal _nonces;

    /// @dev Increase current nonce for msg.sender by one.
    /// @notice This function could be used to invalidate any signed permit out there
    function increasePermitNonce() external returns (uint256) {
        return ++_nonces[msg.sender];
    }

    /// @dev Return current nonce for msg.sender fOR EIP-2612 compatibility
    function nonces(address owner) external view virtual returns (uint256) {
        return _nonces[owner];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

import "../Dependencies/IERC20.sol";
import "../Dependencies/IERC2612.sol";

interface IEBTCToken is IERC20, IERC2612 {
    // --- Functions ---

    function mint(address _account, uint256 _amount) external;

    function burn(address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.17;

interface IPermitNonce {
    // --- Functions ---
    function increasePermitNonce() external returns (uint256);

    function nonces(address owner) external view returns (uint256);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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000000000000000000000000c4cbae499bb4ca41e78f52f07f5d98c375711774000000000000000000000000d366e016ae0677cdce93472e603b75051e022ad00000000000000000000000002a095d44831c26cfb6acb806a6531ae3ca32dbc1

-----Decoded View---------------
Arg [0] : _cdpManagerAddress (address): 0xc4cbaE499bb4Ca41E78f52F07f5d98c375711774
Arg [1] : _borrowerOperationsAddress (address): 0xd366e016Ae0677CdCE93472e603b75051E022AD0
Arg [2] : _authorityAddress (address): 0x2A095d44831C26cFB6aCb806A6531AE3CA32DBc1

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c4cbae499bb4ca41e78f52f07f5d98c375711774
Arg [1] : 000000000000000000000000d366e016ae0677cdce93472e603b75051e022ad0
Arg [2] : 0000000000000000000000002a095d44831c26cfb6acb806a6531ae3ca32dbc1