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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/IEdenToken.sol";
import "./lib/AccessControl.sol";

/**
 * @title EdenToken
 * @dev ERC-20 with minting + add-ons to allow for offchain signing
 * See EIP-712, EIP-2612, and EIP-3009 for details
 */
contract EdenToken is AccessControl, IEdenToken {
    /// @notice EIP-20 token name for this token
    string public override name = "Eden";

    /// @notice EIP-20 token symbol for this token
    string public override symbol = "EDEN";

    /// @notice EIP-20 token decimals for this token
    uint8 public override constant decimals = 18;

    /// @notice Total number of tokens in circulation
    uint256 public override totalSupply;

    /// @notice Max total supply
    uint256 public constant override maxSupply = 250_000_000e18; // 250 million

    /// @notice Minter role
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    /// @notice Address which may change token metadata
    address public override metadataManager;

    /// @dev Allowance amounts on behalf of others
    mapping (address => mapping (address => uint256)) public override allowance;

    /// @dev Official record of token balanceOf for each account
    mapping (address => uint256) public override balanceOf;

    /// @notice The EIP-712 typehash for the contract's domain
    /// keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 public constant override DOMAIN_TYPEHASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;
    
    /// @notice The EIP-712 version hash
    /// keccak256("1");
    bytes32 public constant override VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;

    /// @notice The EIP-712 typehash for permit (EIP-2612)
    /// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant override PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    /// @notice The EIP-712 typehash for transferWithAuthorization (EIP-3009)
    /// keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)");
    bytes32 public constant override TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;

    /// @notice The EIP-712 typehash for receiveWithAuthorization (EIP-3009)
    /// keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    bytes32 public constant override RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;

    /// @notice A record of states for signing / validating signatures
    mapping (address => uint) public override nonces;

    /// @dev authorizer address > nonce > state (true = used / false = unused)
    mapping (address => mapping (bytes32 => bool)) public authorizationState;

    /**
     * @notice Construct a new Eden token
     * @param _admin Default admin role
     */
    constructor(address _admin) {
        metadataManager = _admin;
        emit MetadataManagerChanged(address(0), metadataManager);
        _setupRole(DEFAULT_ADMIN_ROLE, _admin);
    }

    /**
     * @notice Change the metadataManager address
     * @param newMetadataManager The address of the new metadata manager
     * @return true if successful
     */
    function setMetadataManager(address newMetadataManager) external override returns (bool) {
        require(msg.sender == metadataManager, "Eden::setMetadataManager: only MM can change MM");
        emit MetadataManagerChanged(metadataManager, newMetadataManager);
        metadataManager = newMetadataManager;
        return true;
    }

    /**
     * @notice Mint new tokens
     * @param dst The address of the destination account
     * @param amount The number of tokens to be minted
     * @return Boolean indicating success of mint
     */
    function mint(address dst, uint256 amount) external override returns (bool) {
        require(hasRole(MINTER_ROLE, msg.sender), "Eden::mint: only minters can mint");
        require(totalSupply + amount <= maxSupply, "Eden::mint: exceeds max supply");
        require(dst != address(0), "Eden::mint: cannot transfer to the zero address");

        totalSupply = totalSupply + amount;
        balanceOf[dst] = balanceOf[dst] + amount;
        emit Transfer(address(0), dst, amount);
        return true;
    }

    /**
     * @notice Burn tokens
     * @param amount The number of tokens to burn
     * @return Boolean indicating success of burn
     */
    function burn(uint256 amount) external override returns (bool) {
        balanceOf[msg.sender] = balanceOf[msg.sender] - amount;
        totalSupply = totalSupply - amount;
        
        emit Transfer(msg.sender, address(0), amount);
        return true;
    }

    /**
     * @notice Update the token name and symbol
     * @param tokenName The new name for the token
     * @param tokenSymbol The new symbol for the token
     * @return true if successful
     */
    function updateTokenMetadata(string memory tokenName, string memory tokenSymbol) external override returns (bool) {
        require(msg.sender == metadataManager, "Eden::updateTokenMeta: only MM can update token metadata");
        name = tokenName;
        symbol = tokenSymbol;
        emit TokenMetaUpdated(name, symbol);
        return true;
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * It is recommended to use increaseAllowance and decreaseAllowance instead
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * @notice Increase the allowance by a given amount
     * @param spender Spender's address
     * @param addedValue Amount of increase in allowance
     * @return True if successful
     */
    function increaseAllowance(address spender, uint256 addedValue)
        external override
        returns (bool)
    {
        _approve(
            msg.sender, 
            spender, 
            allowance[msg.sender][spender] + addedValue
        );
        return true;
    }

    /**
     * @notice Decrease the allowance by a given amount
     * @param spender Spender's address
     * @param subtractedValue Amount of decrease in allowance
     * @return True if successful
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        external override
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            allowance[msg.sender][spender] - subtractedValue
        );
        return true;
    }

    /**
     * @notice Triggers an approval from owner to spender
     * @param owner The address to approve from
     * @param spender The address to be approved
     * @param value The number of tokens that are approved (2^256-1 means infinite)
     * @param deadline The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function permit(
        address owner, 
        address spender, 
        uint256 value, 
        uint256 deadline, 
        uint8 v, 
        bytes32 r, 
        bytes32 s
    ) external override {
        require(deadline >= block.timestamp, "Eden::permit: signature expired");

        bytes32 encodeData = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline));
        _validateSignedData(owner, encodeData, v, r, s);

        _approve(owner, spender, value);
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 amount) external override returns (bool) {
        _transferTokens(msg.sender, dst, amount);
        return true;
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(address src, address dst, uint256 amount) external override returns (bool) {
        address spender = msg.sender;
        uint256 spenderAllowance = allowance[src][spender];

        if (spender != src && spenderAllowance != type(uint256).max) {
            uint256 newAllowance = spenderAllowance - amount;
            allowance[src][spender] = newAllowance;

            emit Approval(src, spender, newAllowance);
        }

        _transferTokens(src, dst, amount);
        return true;
    }

    /**
     * @notice Transfer tokens with a signed authorization
     * @param from Payer's address (Authorizer)
     * @param to Payee's address
     * @param value Amount to be transferred
     * @param validAfter The time after which this is valid (unix time)
     * @param validBefore The time before which this is valid (unix time)
     * @param nonce Unique nonce
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(block.timestamp > validAfter, "Eden::transferWithAuth: auth not yet valid");
        require(block.timestamp < validBefore, "Eden::transferWithAuth: auth expired");
        require(!authorizationState[from][nonce],  "Eden::transferWithAuth: auth already used");

        bytes32 encodeData = keccak256(abi.encode(TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce));
        _validateSignedData(from, encodeData, v, r, s);

        authorizationState[from][nonce] = true;
        emit AuthorizationUsed(from, nonce);

        _transferTokens(from, to, value);
    }

    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address matches
     * the caller of this function to prevent front-running attacks.
     * @param from Payer's address (Authorizer)
     * @param to Payee's address
     * @param value Amount to be transferred
     * @param validAfter The time after which this is valid (unix time)
     * @param validBefore The time before which this is valid (unix time)
     * @param nonce Unique nonce
     * @param v v of the signature
     * @param r r of the signature
     * @param s s of the signature
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(to == msg.sender, "Eden::receiveWithAuth: caller must be the payee");
        require(block.timestamp > validAfter, "Eden::receiveWithAuth: auth not yet valid");
        require(block.timestamp < validBefore, "Eden::receiveWithAuth: auth expired");
        require(!authorizationState[from][nonce],  "Eden::receiveWithAuth: auth already used");

        bytes32 encodeData = keccak256(abi.encode(RECEIVE_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce));
        _validateSignedData(from, encodeData, v, r, s);

        authorizationState[from][nonce] = true;
        emit AuthorizationUsed(from, nonce);

        _transferTokens(from, to, value);
    }

    /**
     * @notice EIP-712 Domain separator
     * @return Separator
     */
    function getDomainSeparator() public view override returns (bytes32) {
        return keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                VERSION_HASH,
                block.chainid,
                address(this)
            )
        );
    }

    /**
     * @notice Recovers address from signed data and validates the signature
     * @param signer Address that signed the data
     * @param encodeData Data signed by the address
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function _validateSignedData(address signer, bytes32 encodeData, uint8 v, bytes32 r, bytes32 s) internal view {
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                getDomainSeparator(),
                encodeData
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        // Explicitly disallow authorizations for address(0) as ecrecover returns address(0) on malformed messages
        require(recoveredAddress != address(0) && recoveredAddress == signer, "Eden::validateSig: invalid signature");
    }

    /**
     * @notice Approval implementation
     * @param owner The address of the account which owns tokens
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "Eden::_approve: approve from the zero address");
        require(spender != address(0), "Eden::_approve: approve to the zero address");
        allowance[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @notice Transfer implementation
     * @param from The address of the account which owns tokens
     * @param to The address of the account which is receiving tokens
     * @param value The number of tokens that are being transferred
     */
    function _transferTokens(address from, address to, uint256 value) internal {
        require(to != address(0), "Eden::_transferTokens: cannot transfer to the zero address");

        balanceOf[from] = balanceOf[from] - value;
        balanceOf[to] = balanceOf[to] + value;
        emit Transfer(from, to, value);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    function hasRole(bytes32 role, address account) external view returns (bool);

    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    function grantRole(bytes32 role, address account) external;

    function revokeRole(bytes32 role, address account) external;

    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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);

    /**
     * @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);

    /**
     * @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 ^0.8.0;

import "./IERC20.sol";

interface IERC20Burnable is IERC20 {
    function burn(uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20Metadata.sol";
import "./IERC20Mintable.sol";
import "./IERC20Burnable.sol";
import "./IERC20Permit.sol";
import "./IERC20TransferWithAuth.sol";
import "./IERC20SafeAllowance.sol";

interface IERC20Extended is 
    IERC20Metadata, 
    IERC20Mintable, 
    IERC20Burnable, 
    IERC20Permit,
    IERC20TransferWithAuth,
    IERC20SafeAllowance 
{}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

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

pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IERC20Mintable is IERC20 {
    function mint(address dst, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IERC20Permit is IERC20 {
    function getDomainSeparator() external view returns (bytes32);
    function DOMAIN_TYPEHASH() external view returns (bytes32);
    function VERSION_HASH() external view returns (bytes32);
    function PERMIT_TYPEHASH() external view returns (bytes32);
    function nonces(address) external view returns (uint);
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IERC20SafeAllowance is IERC20 {
    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IERC20TransferWithAuth is IERC20 {
    function transferWithAuthorization(address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s) external;
    function receiveWithAuthorization(address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s) external;
    function TRANSFER_WITH_AUTHORIZATION_TYPEHASH() external view returns (bytes32);
    function RECEIVE_WITH_AUTHORIZATION_TYPEHASH() external view returns (bytes32);
    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20Extended.sol";

interface IEdenToken is IERC20Extended {
    function maxSupply() external view returns (uint256);
    function updateTokenMetadata(string memory tokenName, string memory tokenSymbol) external returns (bool);
    function metadataManager() external view returns (address);
    function setMetadataManager(address newMetadataManager) external returns (bool);
    event MetadataManagerChanged(address indexed oldManager, address indexed newManager);
    event TokenMetaUpdated(string indexed name, string indexed symbol);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../interfaces/IAccessControl.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @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 {_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 Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @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) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @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) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @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) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    function _grantRole(bytes32 role, address account) private {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
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: MIT

pragma solidity ^0.8.0;

import "../interfaces/IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

{
  "evmVersion": "berlin",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000fdf8be775bb5e2ba1983dc7b26a655321502e104

-----Decoded View---------------
Arg [0] : _admin (address): 0xFDf8BE775bb5e2Ba1983dC7b26A655321502E104

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000fdf8be775bb5e2ba1983dc7b26a655321502e104