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/* -*- c-basic-offset: 4 -*- */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IECO.sol";
import "./TotalSupplySnapshots.sol";

/**
 * @title An ERC20 token interface for ECOx
 *
 */
contract ECOx is TotalSupplySnapshots {
    //////////////////////////////////////////////
    //////////////////// VARS ////////////////////
    //////////////////////////////////////////////

    /**
     * @dev Mapping storing contracts able to rebase the token
     */
    mapping(address => bool) public snapshotters;

    //////////////////////////////////////////////
    /////////////////// ERRORS ///////////////////
    //////////////////////////////////////////////

    /**
     * error for when transfer returns false
     * used by contracts that import this contract
     */
    error TransferFailed();

    /**
     * error for when an address tries to snapshot without permission
     */
    error OnlySnapshotters();

    //////////////////////////////////////////////
    /////////////////// EVENTS ///////////////////
    //////////////////////////////////////////////

    /**
     * emits when the snapshotters permissions are changed
     * @param actor denotes the new address whose permissions are being updated
     * @param newPermission denotes the new ability of the actor address (true for can snapshot, false for cannot)
     */
    event UpdatedSnapshotters(address actor, bool newPermission);

    //////////////////////////////////////////////
    ////////////////// MODIFIERS /////////////////
    //////////////////////////////////////////////

    /**
     * @dev Modifier for checking if the sender is a snapshotter
     */
    modifier onlySnapshotterRole() {
        if (!snapshotters[msg.sender]) {
            revert OnlySnapshotters();
        }
        _;
    }

    constructor(
        Policy _policy,
        address _pauser
    ) TotalSupplySnapshots(_policy, "ECOx", "ECOx", _pauser) {}

    function initialize(
        address _self
    ) public virtual override onlyConstruction {
        super.initialize(_self);
        pauser = ERC20Pausable(_self).pauser();
    }

    function snapshot() public onlySnapshotterRole {
        _snapshot();
    }

    /**
     * @dev change the rebasing permissions for an address
     * only callable by tokenRoleAdmin
     * @param _key the address to change permissions for
     * @param _value the new permission. true = can snapshot, false = cannot snapshot
     */
    function updateSnapshotters(address _key, bool _value) public onlyPolicy {
        snapshotters[_key] = _value;
        emit UpdatedSnapshotters(_key, _value);
    }
}

// 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 v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` 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:
     *
     * - `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 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current 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.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// 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 v4.6.0) (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: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // 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;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/StringPacker.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "./ERC20Permit.sol";

/**
 * Implementation of the {IERC20} interface.
 *
 * This comment taken from the openzeppelin source contract.
 *
 * 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 open zeppelin guide
 * [How to implement supply mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).
 *
 * 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}.
 */
// internal _name and _symbol are stored immutable as bytes32 and unpacked via StringPacker
contract ERC20 is ERC20Permit {
    mapping(address => uint256) internal _balances;

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

    uint256 internal _totalSupply;

    bytes32 internal immutable _name;
    bytes32 internal immutable _symbol;

    /**
     * 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);

    /**
     * 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
    );

    /**
     * Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) ERC20Permit(name_) {
        _name = StringPacker.pack(name_);
        _symbol = StringPacker.pack(symbol_);
    }

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

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

    /**
     * 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 value {ERC20} uses, unless this function is
     * 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 returns (uint8) {
        return 18;
    }

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

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

    /**
     * See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) public virtual returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

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

    /**
     * See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(
        address spender,
        uint256 amount
    ) public virtual returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][msg.sender];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        unchecked {
            _approve(sender, msg.sender, currentAllowance - amount);
        }

        return true;
    }

    /**
     * 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) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender] + addedValue
        );
        return true;
    }

    /**
     * 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) {
        uint256 currentAllowance = _allowances[msg.sender][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(msg.sender, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 originalAmount
    ) internal virtual {
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 amount = _beforeTokenTransfer(
            sender,
            recipient,
            originalAmount
        );

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, originalAmount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** 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 originalAmount
    ) internal virtual returns (uint256) {
        require(account != address(0), "ERC20: mint to the zero address");

        uint256 amount = _beforeTokenTransfer(
            address(0),
            account,
            originalAmount
        );

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

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

        return amount;
    }

    /**
     * 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 originalAmount
    ) internal virtual returns (uint256) {
        uint256 amount = _beforeTokenTransfer(
            account,
            address(0),
            originalAmount
        );

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

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

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

        return amount;
    }

    /**
     * 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 override {
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * 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 returns (uint256) {
        return amount;
    }

    /**
     * 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 {}
}

/* -*- c-basic-offset: 4 -*- */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../policy/PolicedUpgradeable.sol";
import "./ERC20Pausable.sol";

/**
 * @title An ERC20 token interface for ECOx
 *
 */
contract ERC20MintAndBurn is ERC20Pausable, PolicedUpgradeable {
    // storage gap covers all of ECO contract's old delegation functionality (no ECOx storage to be gapped)
    uint256[10] private __gapMintAndBurn;
    // additional useable gap for future upgradeability
    uint256[50] private __gapMintAndBurn2;
    //////////////////////////////////////////////
    //////////////////// VARS ////////////////////
    //////////////////////////////////////////////
    /**
     * Mapping storing contracts able to mint tokens
     */
    mapping(address => bool) public minters;

    /**
     * Mapping storing contracts able to burn tokens
     */
    mapping(address => bool) public burners;

    //////////////////////////////////////////////
    /////////////////// ERRORS ///////////////////
    //////////////////////////////////////////////

    /**
     * error for when an address tries to mint tokens without permission
     */
    error OnlyMinters();

    /**
     * error for when an address tries to burn tokens without permission
     */
    error OnlyBurners();

    //////////////////////////////////////////////
    /////////////////// EVENTS ///////////////////
    //////////////////////////////////////////////

    /**
     * emits when the minters permissions are changed
     * @param actor denotes the new address whose permissions are being updated
     * @param newPermission denotes the new ability of the actor address (true for can mint, false for cannot)
     */
    event UpdatedMinters(address actor, bool newPermission);

    /**
     * emits when the burners permissions are changed
     * @param actor denotes the new address whose permissions are being updated
     * @param newPermission denotes the new ability of the actor address (true for can burn, false for cannot)
     */
    event UpdatedBurners(address actor, bool newPermission);

    //////////////////////////////////////////////
    ////////////////// MODIFIERS /////////////////
    //////////////////////////////////////////////

    /**
     * Modifier for checking if the sender is a minter
     */
    modifier onlyMinterRole() {
        if (!minters[msg.sender]) {
            revert OnlyMinters();
        }
        _;
    }

    /**
     * Modifier for checking if the sender is allowed to burn
     * both burners and the message sender can burn
     * @param _from the address burning tokens
     */
    modifier onlyBurnerRoleOrSelf(address _from) {
        if (_from != msg.sender && !burners[msg.sender]) {
            revert OnlyBurners();
        }
        _;
    }

    constructor(
        Policy policy,
        string memory name,
        string memory ticker,
        address pauser
    ) Policed(policy) ERC20Pausable(name, ticker, address(policy), pauser) {}

    /**
     * change the minting permissions for an address
     * only callable by tokenRoleAdmin
     * @param _key the address to change permissions for
     * @param _value the new permission. true = can mint, false = cannot mint
     */
    function updateMinters(address _key, bool _value) public onlyPolicy {
        minters[_key] = _value;
        emit UpdatedMinters(_key, _value);
    }

    /**
     * change the burning permissions for an address
     * only callable by tokenRoleAdmin
     * @param _key the address to change permissions for
     * @param _value the new permission. true = can burn, false = cannot burn
     */
    function updateBurners(address _key, bool _value) public onlyPolicy {
        burners[_key] = _value;
        emit UpdatedBurners(_key, _value);
    }

    /**
     * mints tokens to a given address
     * @param _to the address receiving tokens
     * @param _value the amount of tokens being minted
     */
    function mint(address _to, uint256 _value) external onlyMinterRole {
        _mint(_to, _value);
    }

    /**
     * burns tokens to a given address
     * @param _from the address whose tokens are being burned
     * @param _value the amount of tokens being burned
     */
    function burn(
        address _from,
        uint256 _value
    ) external onlyBurnerRoleOrSelf(_from) {
        _burn(_from, _value);
    }

    // protecting future upgradeability
    uint256[50] private __gapMintAndBurn3;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/security/Pausable.sol";
import "./ERC20.sol";

/**
 * Implementation of the {IERC20} interface with pausability
 * When paused by the pauser admin, transfers revert.
 */
contract ERC20Pausable is ERC20, Pausable {
    address public immutable roleAdmin;

    // initially no-one should have the pauser role
    // it can be granted and revoked by the admin policy
    address public pauser;

    /**
     * @notice event indicating the pauser was updated
     * @param pauser The new pauser
     */
    event PauserAssignment(address indexed pauser);

    constructor(
        string memory name,
        string memory symbol,
        address _roleAdmin,
        address _initialPauser
    ) ERC20(name, symbol) {
        require(
            address(_roleAdmin) != address(0),
            "Unrecoverable: do not set the _roleAdmin as the zero address"
        );
        roleAdmin = _roleAdmin;
        pauser = _initialPauser;
        emit PauserAssignment(_initialPauser);
    }

    modifier onlyAdmin() {
        require(msg.sender == roleAdmin, "ERC20Pausable: not admin");
        _;
    }

    modifier onlyPauser() {
        require(msg.sender == pauser, "ERC20Pausable: not pauser");
        _;
    }

    /**
     * Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * If the token is not paused, it will pass through the amount
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override whenNotPaused returns (uint256) {
        return amount;
    }

    /**
     * @notice pauses transfers of this token
     *
     * Security Notes
     *
     * - only callable by the pause
     * - reverts if already paused
     */
    function pause() external onlyPauser {
        _pause();
    }

    /**
     * @notice unpauses transfers of this token
     * only callable by the pauser
     *
     * Security Notes
     *
     * - only callable by the pause
     * - reverts if already unpaused
     */
    function unpause() external onlyPauser {
        _unpause();
    }

    /**
     * @notice set the given address as the pauser
     * @param _pauser The address that can pause this token
     * only the roleAdmin can call this function
     */
    function setPauser(address _pauser) public onlyAdmin {
        require(_pauser != pauser, "ERC20Pausable: must change pauser");
        pauser = _pauser;
        emit PauserAssignment(_pauser);
    }
}

// SPDX-License-Identifier: MIT
// Heavily inspired by:
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/cryptography/EIP712.sol";

/**
 * Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612).
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );

    /**
     * Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"2"`.
     *
     * version number 1 was used already in a previous implementation
     */
    constructor(string memory name) EIP712(name, "2") {
        //empty block in order to pass parameters to the parent EIP712 constructor
    }

    /**
     * See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(
            abi.encode(
                _PERMIT_TYPEHASH,
                owner,
                spender,
                value,
                _useNonce(owner),
                deadline
            )
        );

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * See {IERC20Permit-nonces}.
     */
    function nonces(
        address owner
    ) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(
        address owner
    ) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }

    /**
     * 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;
}

/* -*- c-basic-offset: 4 -*- */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IECO is IERC20 {
    /**
     * Only available to minters
     * @param to the address to mint to
     * @param amount the amount to mint
     */
    function mint(address to, uint256 amount) external;

    /**
     * Only available to token holders for their own tokens and burners
     * @param from the address to burn from
     * @param amount the amount to burn
     */
    function burn(address from, uint256 amount) external;

    /**
     * Returns the votes for the current snapshot
     * @param account the address whose vote balance to check
     * @return balance the balance of the account at the time of the Snapshot
     */
    function voteBalanceSnapshot(
        address account
    ) external view returns (uint256 balance);

    /**
     * Returns the inflation multiplier value for the current snapshot
     * @return multiplier inflation multipler value
     */
    function inflationMultiplierSnapshot()
        external
        view
        returns (uint256 multiplier);

    /**
     *  Returns the total supply for the current snapshot
     * @return total total supply of the current snapshot
     */
    function totalSupplySnapshot() external view returns (uint256 total);

    /**
     * Enables voting with your ECO balance, but will transaction cost
     */
    function enableVoting() external;

    /**
     * Allows others to delegate voting power to you
     * Disallows you from delegating your voting power to others
     */
    function enableDelegationTo() external;

    /**
     * Disallows others from delegating to you
     * Does not change your ability to delegate to others
     */
    function disableDelegationTo() external;

    /**
     * Allows others to delegate to you
     * Disallows you from delegating to others
     */
    function reenableDelegating() external;

    /**
     * Returns true if the address has no amount of their balance delegated, otherwise false
     * @param account the address whose delegation status is being checked
     */
    function isOwnDelegate(address account) external returns (bool);

    /**
     * Fetches the primary address `account` is currently delegating to. Defaults to the account address itself if none specified.
     * The primary delegate is the one that is delegated any new funds the address recieves
     * @param account the address whose primary delegate is being fetched
     */
    function getPrimaryDelegate(
        address account
    ) external view returns (address);

    /**
     * Delegates all votes from the sender to `delegatee`
     * This function assumes that you do not have partial delegations
     * It will revert with "ERC20Delegated: must have an undelegated amount available to cover delegation" if you do
     * @param delegatee the address being delegated to
     */
    function delegate(address delegatee) external;

    /**
     * Delegates all votes from the sender to `delegatee`
     * This function assumes that you do not have partial delegations
     * It will revert with "ERC20Delegated: must have an undelegated amount available to cover delegation" if you do
     * @param delegator the address delegating votes
     * @param delegatee the address being delegated to
     * @param deadline the time at which the signature expires
     * @param v signature value
     * @param r signature value
     * @param s signature value
     */
    function delegateBySig(
        address delegator,
        address delegatee,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * Delegate an `amount` of votes from the sender to `delegatee`
     * @param delegatee the address being delegated to
     * @param amount the amount of tokens being allocated
     */
    function delegateAmount(address delegatee, uint256 amount) external;

    /**
     * Undelegate all votes from the sender's primary delegate
     */
    function undelegate() external;

    /**
     * Allows a primary delegated individual to revoke delegations of unwanted delegators
     * Useful for allowing yourself to call reenableDelegating after calling disableDelegationTo
     * @param delegator the address whose delegation is being revoked
     */
    function revokeDelegation(address delegator) external;

    /**
     * Undelegate a specific amount of votes from the `delegatee` back to the sender
     * @param delegatee the address being undelegated to
     * @param amount the amount of tokens being undelegated
     */
    function undelegateAmountFromAddress(
        address delegatee,
        uint256 amount
    ) external;

    /**
     * See {IERC20-balanceOf}.
     * @param account the address whose vote balance is being checked
     */
    function voteBalanceOf(address account) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC20MintAndBurn.sol";

/**
 * @dev Basic snapshotting just for total supply.
 *
 * This extension maintains a snapshot the total supply which updates on mint or burn after a new snapshot is taken.
 */
abstract contract TotalSupplySnapshots is ERC20MintAndBurn {
    // structure for saving snapshotted values
    struct Snapshot {
        uint32 snapshotBlock;
        uint224 value;
    }

    // the reference snapshotBlock that the update function checks against
    uint32 public currentSnapshotBlock;

    // the snapshot to track the token total supply
    Snapshot internal _totalSupplySnapshot;

    /**
     * @dev Emitted by {_snapshot} when a new snapshot is created.
     *
     * @param block the new value of currentSnapshotBlock
     */
    event NewSnapshotBlock(uint256 block);

    constructor(
        Policy _policy,
        string memory _name,
        string memory _symbol,
        address _initialPauser
    ) ERC20MintAndBurn(_policy, _name, _symbol, _initialPauser) {
        // snapshot on creation to make it clear that everyone's balances should be updated
        _snapshot();
    }

    function initialize(
        address _self
    ) public virtual override onlyConstruction {
        super.initialize(_self);
        // snapshot on initialization to make it clear that everyone's balances should be updated after upgrade
        _snapshot();
    }

    /**
     * @dev Retrieve the `totalSupply` for the snapshot
     */
    function totalSupplySnapshot() public view virtual returns (uint256) {
        if (
            currentSnapshotBlock != block.number &&
            _totalSupplySnapshot.snapshotBlock < currentSnapshotBlock
        ) {
            return _totalSupply;
        } else {
            return _totalSupplySnapshot.value;
        }
    }

    /**
     * Update total supply snapshots before the values are modified. This is implemented
     * in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override returns (uint256) {
        if (from == address(0)) {
            // mint
            _updateTotalSupplySnapshot();
        } else if (to == address(0)) {
            // burn
            _updateTotalSupplySnapshot();
        }

        return super._beforeTokenTransfer(from, to, amount);
    }

    /**
     * @dev Creates a new snapshot and returns its snapshot id.
     *
     * Emits a {NewSnapshotBlock} event that contains the same id.
     */
    function _snapshot() internal virtual {
        // the math will error if the snapshot overflows
        currentSnapshotBlock = uint32(block.number);

        emit NewSnapshotBlock(block.number);
    }

    function _updateTotalSupplySnapshot() private {
        uint32 _currentSnapshotBlock = currentSnapshotBlock;
        // take no action during the snapshot block, only after it
        if (_currentSnapshotBlock == block.number) {
            return;
        }

        if (_totalSupplySnapshot.snapshotBlock < _currentSnapshotBlock) {
            uint256 currentValue = _totalSupply;
            require(
                currentValue <= type(uint224).max,
                "VoteSnapshots: new snapshot cannot be casted safely"
            );
            _totalSupplySnapshot.snapshotBlock = _currentSnapshotBlock;
            _totalSupplySnapshot.value = uint224(currentValue);
        }
    }

    // protecting future upgradeability
    uint256[50] private __gapTotalSupplySnapshots;
}

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

import "./Policy.sol";

/**
 * @title Policed Contracts
 * @notice A policed contract is any contract managed by a policy.
 */
abstract contract Policed {
    /** The address of the root policy instance overseeing this instance.
     */
    Policy public immutable policy;

    /** If the policy address is set to zero, the contract is unrecoverably ungovernable
     */
    error NonZeroPolicyAddr();

    /**
     * If this address is set to zero the contract is an unusable state
     * @param contractName the name of the contract that was given as the zero address
     */
    error NonZeroContractAddr(string contractName);

    /** For if a non-policy address tries to access policy role gated functionality
     */
    error PolicyOnlyFunction();

    /** Restrict method access to the root policy instance only.
     */
    modifier onlyPolicy() {
        if (msg.sender != address(policy)) {
            revert PolicyOnlyFunction();
        }
        _;
    }

    /** constructor
     * @param _policy the address of the owning policy contract
     */
    constructor(Policy _policy) {
        // _setPolicy(_policy);
        if (address(_policy) == address(0)) {
            revert NonZeroPolicyAddr();
        }
        policy = _policy;
    }
}

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

import "./Policed.sol";

/** @title Policed Proxy Contracts
 *
 * A PolicedUpgradeable contract is any proxied contract managed by a policy.
 */
abstract contract PolicedUpgradeable is Policed, ForwardTarget {
    // storage gap covers PolicedUtils.expectedInterfaceSet
    // relevant for ECOxStaking
    uint256 private __gapPolicedUpgradeable;

    function setImplementation(address _impl) public onlyPolicy {
        _setImplementation(_impl);
    }
}

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

import "../proxy/ForwardTarget.sol";

/**
 * @title The policy contract that oversees other contracts
 * @notice Policy contracts provide a mechanism for building pluggable (after deploy)
 * governance systems for other contracts.
 */
contract Policy is ForwardTarget {
    uint256 private __gapPolicy; // to cover setters mapping

    /**
     * the contract allowed enact proposals
     */
    address public governor;

    /**
     * error for when an address tries submit proposal actions without permission
     */
    error OnlyGovernor();

    /**
     * error for when an address tries to call a pseudo-internal function
     */
    error OnlySelf();

    /**
     * for when a part of enacting a proposal reverts without a readable error
     * @param proposal the proposal address that got reverted during enaction
     */
    error FailedProposal(address proposal);

    /**
     * emits when the governor permissions are changed
     * @param oldGovernor denotes the old address whose permissions are being removed
     * @param newGovernor denotes the new address whose permissions are being added
     */
    event UpdatedGovernor(address oldGovernor, address newGovernor);

    /**
     * emits when enaction happens to keep record of enaction
     * @param proposal the proposal address that got successfully enacted
     * @param governor the contract which was the source of the proposal, source for looking up the calldata
     */
    event EnactedGovernanceProposal(address proposal, address governor);

    /**
     * Modifier for checking if the sender is a governor
     */
    modifier onlyGovernorRole() {
        if (msg.sender != governor) {
            revert OnlyGovernor();
        }
        _;
    }

    /**
     * Modifier for faux internal calls
     * needed for function to be called only during delegate call
     */
    modifier onlySelf() {
        if (msg.sender != address(this)) {
            revert OnlySelf();
        }
        _;
    }

    constructor(address _governor) {
        governor = _governor;
    }

    /**
     * initializes the governor
     */
    function initialize(
        address _self
    ) public virtual override onlyConstruction {
        super.initialize(_self);

        governor = Policy(_self).governor();
    }

    /**
     * pass the governance permissions to another address
     * @param _newGovernor the address to make the new governor
     */
    function updateGovernor(address _newGovernor) public onlySelf {
        emit UpdatedGovernor(governor, _newGovernor);
        governor = _newGovernor;
    }

    function enact(address proposal) external virtual onlyGovernorRole {
        // solhint-disable-next-line avoid-low-level-calls
        (bool _success, bytes memory returndata) = proposal.delegatecall(
            abi.encodeWithSignature("enacted(address)", proposal)
        );
        if (!_success) {
            if (returndata.length == 0) revert FailedProposal(proposal);
            assembly {
                revert(add(32, returndata), mload(returndata))
            }
        }

        emit EnactedGovernanceProposal(proposal, msg.sender);
    }

    // function required for backwards compatability of the contract interface to allow for the old governance execution call to complete
    function removeSelf(bytes32) external {}
}

/* -*- c-basic-offset: 4 -*- */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/* solhint-disable no-inline-assembly */

/**
 * @title Target for ForwardProxy and EcoInitializable
 */
abstract contract ForwardTarget {
    // Must match definition in ForwardProxy
    // keccak256("com.eco.ForwardProxy.target")
    uint256 private constant IMPLEMENTATION_SLOT =
        0xf86c915dad5894faca0dfa067c58fdf4307406d255ed0a65db394f82b77f53d4;

    modifier onlyConstruction() {
        require(
            implementation() == address(0),
            "Can only be called during initialization"
        );
        _;
    }

    constructor() {
        _setImplementation(address(this));
    }

    /** Storage initialization of cloned contract
     *
     * This is used to initialize the storage of the forwarded contract, and
     * should (typically) copy or repeat any work that would normally be
     * done in the constructor of the proxied contract.
     *
     * Implementations of ForwardTarget should override this function,
     * and chain to super.initialize(_self).
     *
     * @param _self The address of the original contract instance (the one being
     *              forwarded to).
     */
    function initialize(address _self) public virtual onlyConstruction {
        address _implAddress = address(ForwardTarget(_self).implementation());
        require(
            _implAddress != address(0),
            "initialization failure: nothing to implement"
        );
        _setImplementation(_implAddress);
    }

    /** Get the address of the proxy target contract.
     */
    function implementation() public view returns (address _impl) {
        assembly {
            _impl := sload(IMPLEMENTATION_SLOT)
        }
    }

    /** Set new implementation */
    function _setImplementation(address _impl) internal {
        require(implementation() != _impl, "Implementation already matching");
        assembly {
            sstore(IMPLEMENTATION_SLOT, _impl)
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// might not need this

library StringPacker {
    // takes a string of 31 or less characters and converts it to bytes32
    function pack(
        string memory unpacked
    ) internal pure returns (bytes32 packed) {
        // do not use this function in a lossy way, it will not work
        // only strings with 31 or less characters are stored in memory packed with their length value
        require(bytes(unpacked).length < 32);
        // shift the memory pointer to pack the length of the string into the high byte
        // by assigning this to the return value, the type of bytes32 means that, when returning,
        // the pointer continues to read into the string data
        assembly {
            packed := mload(add(unpacked, 31))
        }
    }

    // takes a bytes32 packed in the format above and unpacks it into a string
    function unpack(
        bytes32 packed
    ) internal pure returns (string memory unpacked) {
        // get the high byte which stores the length of the string when unpacked
        uint256 len = uint256(packed >> 248);
        // ensure that the length of the unpacked string doesn't read beyond the input value
        require(len < 32);
        // initialize the return value with the length
        unpacked = string(new bytes(len));
        // shift the pointer so that the length will be at the bottom of the word to match string encoding
        // then store the packed value
        assembly {
            // Potentially writes into unallocated memory as the length in the packed form will trail off the end
            // This is fine as there are no other relevant memory values to overwrite
            mstore(add(unpacked, 31), packed)
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000008c02d4cc62f79aceb652321a9f8988c0f6e71e680000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _policy (address): 0x8c02D4cc62F79AcEB652321a9f8988c0f6E71E68
Arg [1] : _pauser (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000008c02d4cc62f79aceb652321a9f8988c0f6e71e68
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000