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// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.26;

import {Auth} from "src/Auth.sol";
import {EIP712Lib} from "src/libraries/EIP712Lib.sol";
import {SignatureLib} from "src/libraries/SignatureLib.sol";
import {IERC20, IERC20Metadata, IERC20Permit} from "src/interfaces/IERC20.sol";

/// @title  ERC20
/// @notice Standard ERC-20 implementation, with mint/burn functionality and permit logic.
/// @author Modified from https://github.com/makerdao/xdomain-dss/blob/master/src/Dai.sol
contract ERC20 is Auth, IERC20Metadata, IERC20Permit {
    /// @inheritdoc IERC20Metadata
    string public name;
    /// @inheritdoc IERC20Metadata
    string public symbol;
    /// @inheritdoc IERC20Metadata
    uint8 public immutable decimals;
    /// @inheritdoc IERC20
    uint256 public totalSupply;

    mapping(address => uint256) private balances;

    /// @inheritdoc IERC20
    mapping(address => mapping(address => uint256)) public allowance;
    /// @inheritdoc IERC20Permit
    mapping(address => uint256) public nonces;

    // --- EIP712 ---
    bytes32 private immutable nameHash;
    bytes32 private immutable versionHash;
    uint256 public immutable deploymentChainId;
    bytes32 private immutable _DOMAIN_SEPARATOR;
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    // --- Events ---
    event File(bytes32 indexed what, string data);

    constructor(uint8 decimals_) Auth(msg.sender) {
        decimals = decimals_;

        nameHash = keccak256(bytes("Centrifuge"));
        versionHash = keccak256(bytes("1"));
        deploymentChainId = block.chainid;
        _DOMAIN_SEPARATOR = EIP712Lib.calculateDomainSeparator(nameHash, versionHash);
    }

    function _balanceOf(address user) internal view virtual returns (uint256) {
        return balances[user];
    }

    /// @inheritdoc IERC20
    function balanceOf(address user) public view virtual returns (uint256) {
        return _balanceOf(user);
    }

    function _setBalance(address user, uint256 value) internal virtual {
        balances[user] = value;
    }

    /// @inheritdoc IERC20Permit
    function DOMAIN_SEPARATOR() public view returns (bytes32) {
        return block.chainid == deploymentChainId
            ? _DOMAIN_SEPARATOR
            : EIP712Lib.calculateDomainSeparator(nameHash, versionHash);
    }

    // --- Administration ---
    function file(bytes32 what, string memory data) public virtual auth {
        if (what == "name") name = data;
        else if (what == "symbol") symbol = data;
        else revert("ERC20/file-unrecognized-param");
        emit File(what, data);
    }

    // --- ERC20 Mutations ---
    /// @inheritdoc IERC20
    function transfer(address to, uint256 value) public virtual returns (bool) {
        require(to != address(0) && to != address(this), "ERC20/invalid-address");
        uint256 balance = balanceOf(msg.sender);
        require(balance >= value, "ERC20/insufficient-balance");

        unchecked {
            _setBalance(msg.sender, _balanceOf(msg.sender) - value);
            // note: we don't need an overflow check here b/c sum of all balances == totalSupply
            _setBalance(to, _balanceOf(to) + value);
        }

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

        return true;
    }

    /// @inheritdoc IERC20
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        return _transferFrom(msg.sender, from, to, value);
    }

    function _transferFrom(address sender, address from, address to, uint256 value) internal virtual returns (bool) {
        require(to != address(0) && to != address(this), "ERC20/invalid-address");
        uint256 balance = balanceOf(from);
        require(balance >= value, "ERC20/insufficient-balance");

        if (from != sender) {
            uint256 allowed = allowance[from][sender];
            if (allowed != type(uint256).max) {
                require(allowed >= value, "ERC20/insufficient-allowance");
                unchecked {
                    allowance[from][sender] = allowed - value;
                }
            }
        }

        unchecked {
            _setBalance(from, _balanceOf(from) - value);
            // note: we don't need an overflow check here b/c sum of all balances == totalSupply
            _setBalance(to, _balanceOf(to) + value);
        }

        emit Transfer(from, to, value);

        return true;
    }

    /// @inheritdoc IERC20
    function approve(address spender, uint256 value) external returns (bool) {
        allowance[msg.sender][spender] = value;

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

        return true;
    }

    // --- Mint/Burn ---
    function mint(address to, uint256 value) public virtual auth {
        require(to != address(0) && to != address(this), "ERC20/invalid-address");
        unchecked {
            // We don't need an overflow check here b/c balances[to] <= totalSupply
            // and there is an overflow check below
            _setBalance(to, _balanceOf(to) + value);
        }
        totalSupply = totalSupply + value;

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

    function burn(address from, uint256 value) public virtual auth {
        uint256 balance = balanceOf(from);
        require(balance >= value, "ERC20/insufficient-balance");

        if (from != msg.sender) {
            uint256 allowed = allowance[from][msg.sender];
            if (allowed != type(uint256).max) {
                require(allowed >= value, "ERC20/insufficient-allowance");

                unchecked {
                    allowance[from][msg.sender] = allowed - value;
                }
            }
        }

        unchecked {
            // We don't need overflow checks b/c require(balance >= value) and balance <= totalSupply
            _setBalance(from, _balanceOf(from) - value);
            totalSupply = totalSupply - value;
        }

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

    // --- Approve by signature ---
    function permit(address owner, address spender, uint256 value, uint256 deadline, bytes memory signature) public {
        require(block.timestamp <= deadline, "ERC20/permit-expired");

        uint256 nonce;
        unchecked {
            nonce = nonces[owner]++;
        }

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR(),
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonce, deadline))
            )
        );

        require(SignatureLib.isValidSignature(owner, digest, signature), "ERC20/invalid-permit");

        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /// @inheritdoc IERC20Permit
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external
    {
        permit(owner, spender, value, deadline, abi.encodePacked(r, s, v));
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.26;

import {IAuth} from "src/interfaces/IAuth.sol";

/// @title  Auth
/// @notice Simple authentication pattern
/// @author Based on code from https://github.com/makerdao/dss
abstract contract Auth is IAuth {
    /// @inheritdoc IAuth
    mapping(address => uint256) public wards;

    constructor(address initialWard) {
        wards[initialWard] = 1;
        emit Rely(initialWard);
    }

    /// @dev Check if the msg.sender has permissions
    modifier auth() {
        require(wards[msg.sender] == 1, "Auth/not-authorized");
        _;
    }

    /// @inheritdoc IAuth
    function rely(address user) external auth {
        wards[user] = 1;
        emit Rely(user);
    }

    /// @inheritdoc IAuth
    function deny(address user) external auth {
        wards[user] = 0;
        emit Deny(user);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.26;

/// @title  EIP712 Lib
library EIP712Lib {
    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 public constant EIP712_DOMAIN_TYPEHASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    function calculateDomainSeparator(bytes32 nameHash, bytes32 versionHash) internal view returns (bytes32) {
        return keccak256(abi.encode(EIP712_DOMAIN_TYPEHASH, nameHash, versionHash, block.chainid, address(this)));
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.26;

interface IERC1271 {
    function isValidSignature(bytes32, bytes memory) external view returns (bytes4);
}

/// @title  Signature Lib
library SignatureLib {
    function isValidSignature(address signer, bytes32 digest, bytes memory signature)
        internal
        view
        returns (bool valid)
    {
        require(signer != address(0), "SignatureLib/invalid-signer");

        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            if (signer == ecrecover(digest, v, r, s)) {
                return true;
            }
        }

        if (signer.code.length > 0) {
            (bool success, bytes memory result) =
                signer.staticcall(abi.encodeCall(IERC1271.isValidSignature, (digest, signature)));
            valid =
                (success && result.length == 32 && abi.decode(result, (bytes4)) == IERC1271.isValidSignature.selector);
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.5.0;

/// @title  IERC20
/// @dev    Interface of the ERC20 standard as defined in the EIP.
/// @author Modified from OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
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);
}

/**
 * @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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
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].
     *
     * CAUTION: See Security Considerations above.
     */
    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);
}

interface IERC20Wrapper {
    /**
     * @dev Returns the address of the underlying ERC-20 token that is being wrapped.
     */
    function underlying() external view returns (address);

    /**
     * @dev Allow a user to deposit underlying tokens and mint the corresponding number of wrapped tokens.
     */
    function depositFor(address account, uint256 value) external returns (bool);

    /**
     * @dev Allow a user to burn a number of wrapped tokens and withdraw the corresponding number of underlying tokens.
     */
    function withdrawTo(address account, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.5.0;

interface IAuth {
    event Rely(address indexed user);
    event Deny(address indexed user);

    /// @notice Returns whether the target is a ward (has admin access)
    function wards(address target) external view returns (uint256);

    /// @notice Make user a ward (give them admin access)
    function rely(address user) external;

    /// @notice Remove user as a ward (remove admin access)
    function deny(address user) external;
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "@chimera/=lib/chimera/src/",
    "chimera/=lib/chimera/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

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r","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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