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// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

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

/**
 * @title XVS
 * @author Venus
 * @notice XVS contract serves as a customized ERC-20 token with additional minting and burning functionality.
 *  It also incorporates access control features provided by the "TokenController" contract to ensure proper governance and restrictions on minting and burning operations.
 */

contract XVS is ERC20, TokenController {
    constructor(address accessControlManager_) ERC20("Venus XVS", "XVS") TokenController(accessControlManager_) {}

    /**
     * @notice Creates `amount_` tokens and assigns them to `account_`, increasing
     * the total supply. Checks access and eligibility.
     * @param account_ Address to which tokens are assigned.
     * @param amount_ Amount of tokens to be assigned.
     * @custom:access Controlled by AccessControlManager.
     * @custom:event Emits MintLimitDecreased with new available limit.
     * @custom:error MintLimitExceed is thrown when minting amount exceeds the maximum cap.
     */
    function mint(address account_, uint256 amount_) external whenNotPaused {
        _ensureAllowed("mint(address,uint256)");
        _isEligibleToMint(msg.sender, account_, amount_);
        _mint(account_, amount_);
    }

    /**
     * @notice Destroys `amount_` tokens from `account_`, reducing the
     * total supply. Checks access and eligibility.
     * @param account_ Address from which tokens be destroyed.
     * @param amount_ Amount of tokens to be destroyed.
     * @custom:access Controlled by AccessControlManager.
     * @custom:event Emits MintLimitIncreased with new available limit.
     */
    function burn(address account_, uint256 amount_) external whenNotPaused {
        _ensureAllowed("burn(address,uint256)");
        _burn(account_, amount_);
        _increaseMintLimit(msg.sender, amount_);
    }

    /**
     * @notice Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     * @param from_ Address of account from which tokens are to be transferred.
     * @param to_ Address of the account to which tokens are to be transferred.
     * @param amount_ The amount of tokens to be transferred.
     * @custom:error AccountBlacklisted is thrown when either `from` or `to` address is blacklisted.
     */
    function _beforeTokenTransfer(address from_, address to_, uint256 amount_) internal override whenNotPaused {
        if (_blacklist[to_]) {
            revert AccountBlacklisted(to_);
        }
        if (_blacklist[from_]) {
            revert AccountBlacklisted(from_);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

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

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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);

    /**
     * @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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

import "@openzeppelin/contracts/access/IAccessControl.sol";

/**
 * @title IAccessControlManagerV8
 * @author Venus
 * @notice Interface implemented by the `AccessControlManagerV8` contract.
 */
interface IAccessControlManagerV8 is IAccessControl {
    function giveCallPermission(address contractAddress, string calldata functionSig, address accountToPermit) external;

    function revokeCallPermission(
        address contractAddress,
        string calldata functionSig,
        address accountToRevoke
    ) external;

    function isAllowedToCall(address account, string calldata functionSig) external view returns (bool);

    function hasPermission(
        address account,
        address contractAddress,
        string calldata functionSig
    ) external view returns (bool);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;

/// @notice Thrown if the supplied address is a zero address where it is not allowed
error ZeroAddressNotAllowed();

/// @notice Checks if the provided address is nonzero, reverts otherwise
/// @param address_ Address to check
/// @custom:error ZeroAddressNotAllowed is thrown if the provided address is a zero address
function ensureNonzeroAddress(address address_) pure {
    if (address_ == address(0)) {
        revert ZeroAddressNotAllowed();
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.13;
import { IAccessControlManagerV8 } from "@venusprotocol/governance-contracts/contracts/Governance/IAccessControlManagerV8.sol";
import { Pausable } from "@openzeppelin/contracts/security/Pausable.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ensureNonzeroAddress } from "@venusprotocol/solidity-utilities/contracts/validators.sol";

/**
 * @title TokenController
 * @author Venus
 * @notice TokenController contract acts as a governance and access control mechanism,
 * allowing the owner to manage minting restrictions and blacklist certain addresses to maintain control and security within the token ecosystem.
 * It provides a flexible framework for token-related operations.
 */

contract TokenController is Ownable, Pausable {
    /**
     * @notice Access control manager contract address.
     */
    address public accessControlManager;
    /**
     * @notice A Mapping used to keep track of the blacklist status of addresses.
     */
    mapping(address => bool) internal _blacklist;
    /**
     * @notice A mapping is used to keep track of the maximum amount a minter is permitted to mint.
     */
    mapping(address => uint256) public minterToCap;
    /**
     * @notice A Mapping used to keep track of the amount i.e already minted by minter.
     */
    mapping(address => uint256) public minterToMintedAmount;

    /**
     * @notice Emitted when the blacklist status of a user is updated.
     */
    event BlacklistUpdated(address indexed user, bool value);
    /**
     * @notice Emitted when the minting limit for a minter is increased.
     */
    event MintLimitIncreased(address indexed minter, uint256 newLimit);
    /**
     * @notice Emitted when the minting limit for a minter is decreased.
     */
    event MintLimitDecreased(address indexed minter, uint256 newLimit);
    /**
     * @notice Emitted when the minting cap for a minter is changed.
     */
    event MintCapChanged(address indexed minter, uint256 amount);
    /**
     * @notice Emitted when the address of the access control manager of the contract is updated.
     */
    event NewAccessControlManager(address indexed oldAccessControlManager, address indexed newAccessControlManager);
    /**
     * @notice Emitted when all minted tokens are migrated from one minter to another.
     */
    event MintedTokensMigrated(address indexed source, address indexed destination);

    /**
     * @notice This error is used to indicate that the minting limit has been exceeded. It is typically thrown when a minting operation would surpass the defined cap.
     */
    error MintLimitExceed();
    /**
     * @notice This error is used to indicate that `mint` `burn` and `transfer` actions are not allowed for the user address.
     */
    error AccountBlacklisted(address user);
    /**
     * @notice This error is used to indicate that sender is not allowed to perform this action.
     */
    error Unauthorized();
    /**
     * @notice This error is used to indicate that the new cap is greater than the previously minted tokens for the minter.
     */
    error NewCapNotGreaterThanMintedTokens();
    /**
     * @notice This error is used to indicate that the addresses must be different.
     */
    error AddressesMustDiffer();
    /**
     * @notice This error is used to indicate that the minter did not mint the required amount of tokens.
     */
    error MintedAmountExceed();

    /**
     * @param accessControlManager_ Address of access control manager contract.
     * @custom:error ZeroAddressNotAllowed is thrown when accessControlManager contract address is zero.
     */
    constructor(address accessControlManager_) {
        ensureNonzeroAddress(accessControlManager_);
        accessControlManager = accessControlManager_;
    }

    /**
     * @notice Pauses Token
     * @custom:access Controlled by AccessControlManager.
     */
    function pause() external {
        _ensureAllowed("pause()");
        _pause();
    }

    /**
     * @notice Resumes Token
     * @custom:access Controlled by AccessControlManager.
     */
    function unpause() external {
        _ensureAllowed("unpause()");
        _unpause();
    }

    /**
     * @notice Function to update blacklist.
     * @param user_ User address to be affected.
     * @param value_ Boolean to toggle value.
     * @custom:access Controlled by AccessControlManager.
     * @custom:event Emits BlacklistUpdated event.
     */
    function updateBlacklist(address user_, bool value_) external {
        _ensureAllowed("updateBlacklist(address,bool)");
        _blacklist[user_] = value_;
        emit BlacklistUpdated(user_, value_);
    }

    /**
     * @notice Sets the minting cap for minter.
     * @param minter_ Minter address.
     * @param amount_ Cap for the minter.
     * @custom:access Controlled by AccessControlManager.
     * @custom:event Emits MintCapChanged.
     */
    function setMintCap(address minter_, uint256 amount_) external {
        _ensureAllowed("setMintCap(address,uint256)");

        if (amount_ < minterToMintedAmount[minter_]) {
            revert NewCapNotGreaterThanMintedTokens();
        }

        minterToCap[minter_] = amount_;
        emit MintCapChanged(minter_, amount_);
    }

    /**
     * @notice Sets the address of the access control manager of this contract.
     * @dev Admin function to set the access control address.
     * @param newAccessControlAddress_ New address for the access control.
     * @custom:access Only owner.
     * @custom:event Emits NewAccessControlManager.
     * @custom:error ZeroAddressNotAllowed is thrown when newAccessControlAddress_ contract address is zero.
     */
    function setAccessControlManager(address newAccessControlAddress_) external onlyOwner {
        ensureNonzeroAddress(newAccessControlAddress_);
        emit NewAccessControlManager(accessControlManager, newAccessControlAddress_);
        accessControlManager = newAccessControlAddress_;
    }

    /**
     * @notice Migrates all minted tokens from one minter to another. This function is useful when we want to permanent take down a bridge.
     * @param source_ Minter address to migrate tokens from.
     * @param destination_ Minter address to migrate tokens to.
     * @custom:access Controlled by AccessControlManager.
     * @custom:error MintLimitExceed is thrown when the minting limit exceeds the cap after migration.
     * @custom:error AddressesMustDiffer is thrown when the source_ and destination_ addresses are the same.
     * @custom:event Emits MintLimitIncreased and MintLimitDecreased events for 'source' and 'destination'.
     * @custom:event Emits MintedTokensMigrated.
     */
    function migrateMinterTokens(address source_, address destination_) external {
        _ensureAllowed("migrateMinterTokens(address,address)");

        if (source_ == destination_) {
            revert AddressesMustDiffer();
        }

        uint256 sourceCap = minterToCap[source_];
        uint256 destinationCap = minterToCap[destination_];

        uint256 sourceMinted = minterToMintedAmount[source_];
        uint256 destinationMinted = minterToMintedAmount[destination_];
        uint256 newDestinationMinted = destinationMinted + sourceMinted;

        if (newDestinationMinted > destinationCap) {
            revert MintLimitExceed();
        }

        minterToMintedAmount[source_] = 0;
        minterToMintedAmount[destination_] = newDestinationMinted;
        uint256 availableLimit;
        unchecked {
            availableLimit = destinationCap - newDestinationMinted;
        }

        emit MintLimitDecreased(destination_, availableLimit);
        emit MintLimitIncreased(source_, sourceCap);
        emit MintedTokensMigrated(source_, destination_);
    }

    /**
     * @notice Returns the blacklist status of the address.
     * @param user_ Address of user to check blacklist status.
     * @return bool status of blacklist.
     */
    function isBlackListed(address user_) external view returns (bool) {
        return _blacklist[user_];
    }

    /**
     * @dev Checks the minter cap and eligibility of receiver to receive tokens.
     * @param from_  Minter address.
     * @param to_  Receiver address.
     * @param amount_  Amount to be mint.
     * @custom:error MintLimitExceed is thrown when minting limit exceeds the cap.
     * @custom:event Emits MintLimitDecreased with minter address and available limits.
     */
    function _isEligibleToMint(address from_, address to_, uint256 amount_) internal {
        uint256 mintingCap = minterToCap[from_];
        uint256 totalMintedOld = minterToMintedAmount[from_];
        uint256 totalMintedNew = totalMintedOld + amount_;

        if (totalMintedNew > mintingCap) {
            revert MintLimitExceed();
        }
        minterToMintedAmount[from_] = totalMintedNew;
        uint256 availableLimit;
        unchecked {
            availableLimit = mintingCap - totalMintedNew;
        }
        emit MintLimitDecreased(from_, availableLimit);
    }

    /**
     * @dev This is post hook of burn function, increases minting limit of the minter.
     * @param from_ Minter address.
     * @param amount_  Amount burned.
     * @custom:error MintedAmountExceed is thrown when `amount_` is greater than the tokens minted by `from_`.
     * @custom:event Emits MintLimitIncreased with minter address and availabe limit.
     */
    function _increaseMintLimit(address from_, uint256 amount_) internal {
        uint256 totalMintedOld = minterToMintedAmount[from_];

        if (totalMintedOld < amount_) {
            revert MintedAmountExceed();
        }

        uint256 totalMintedNew;
        unchecked {
            totalMintedNew = totalMintedOld - amount_;
        }
        minterToMintedAmount[from_] = totalMintedNew;
        uint256 availableLimit = minterToCap[from_] - totalMintedNew;
        emit MintLimitIncreased(from_, availableLimit);
    }

    /**
     * @dev Checks the caller is allowed to call the specified fuction.
     * @param functionSig_ Function signatureon which access is to be checked.
     * @custom:error Unauthorized, thrown when unauthorised user try to access function.
     */
    function _ensureAllowed(string memory functionSig_) internal view {
        if (!IAccessControlManagerV8(accessControlManager).isAllowedToCall(msg.sender, functionSig_)) {
            revert Unauthorized();
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000230058da2d23eb8836ec5db7037ef7250c56e25e

-----Decoded View---------------
Arg [0] : accessControlManager_ (address): 0x230058da2D23eb8836EC5DB7037ef7250c56E25E

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000230058da2d23eb8836ec5db7037ef7250c56e25e