// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

// ════════════════════════════════════════════════ INTERFACES ═════════════════════════════════════════════════════

import {IZapRecipient} from "../interfaces/IZapRecipient.sol";

// ═════════════════════════════════════════════ INTERNAL IMPORTS ══════════════════════════════════════════════════

import {ZapDataV1} from "../libs/ZapDataV1.sol";

// ═════════════════════════════════════════════ EXTERNAL IMPORTS ══════════════════════════════════════════════════

import {IERC20, SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";

/// @title TokenZapV1
/// @notice Facilitates atomic token operations known as "Zaps", allowing the execution of predefined actions
/// on behalf of users, such as deposits or swaps. Supports ERC20 tokens and native gas tokens (e.g., ETH).
/// @dev Tokens must be transferred to the contract before execution, native tokens could be provided as `msg.value`.
/// This contract is stateless and does not hold assets between Zaps; leftover tokens can be claimed by anyone.
/// Ensure that Zaps fully utilize tokens or revert to prevent the loss of funds.
contract TokenZapV1 is IZapRecipient {
    using SafeERC20 for IERC20;
    using ZapDataV1 for bytes;

    address public constant NATIVE_GAS_TOKEN = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    error TokenZapV1__FinalBalanceBelowMin();
    error TokenZapV1__FinalTokenNotSpecified();
    error TokenZapV1__PayloadLengthAboveMax();
    error TokenZapV1__TargetZeroAddress();
    error TokenZapV1__TokenZeroAddress();

    /// @notice Allows the contract to receive ETH.
    /// @dev Leftover ETH can be claimed by anyone. Ensure the full balance is spent during Zaps.
    receive() external payable {}

    /// @notice Performs a Zap action using the specified token and amount. This amount must have previously been
    /// transferred to this contract (could also be supplied as msg.value if the token is a native gas token).
    /// Zap action will be performed forwarding full `msg.value` for ERC20s or `amount` for native gas tokens.
    /// Note: all funds remaining after the Zap action is performed can be claimed by anyone.
    /// Make sure to spend the full balance during the Zaps and avoid sending extra funds if a single Zap is performed.
    /// @dev The provided ZapData contains the target address and calldata for the Zap action, and must be
    /// encoded using the encodeZapData function. Native gas token transfers could be done by using empty `payload`,
    /// this is the only case where target could be an EOA.
    /// @param token        Address of the token to be used for the Zap action.
    /// @param amount       Amount of the token to be used for the Zap action.
    /// @param zapData      Encoded Zap Data containing the target address and calldata for the Zap action.
    /// @return selector    Selector of this function to signal the caller about the success of the Zap action.
    function zap(address token, uint256 amount, bytes calldata zapData) external payable returns (bytes4) {
        if (token == address(0)) revert TokenZapV1__TokenZeroAddress();
        // Validate the ZapData format and extract the target address.
        zapData.validateV1();
        address target = zapData.target();
        if (target == address(0)) revert TokenZapV1__TargetZeroAddress();
        // Note: we don't check the amount that was transferred to TokenZapV1 (or msg.value for native gas tokens).
        // Transferring more than `amount` will lead to remaining funds in TokenZapV1, which can be claimed by anyone.
        // Ensure that you send the exact amount for a single Zap or spend the full balance for multiple `zap()` calls.
        uint256 msgValue = msg.value;
        if (token == NATIVE_GAS_TOKEN) {
            // For native gas tokens, we forward the requested amount to the target contract during the Zap action.
            // Similar to ERC20s, we allow using pre-transferred native tokens for the Zap.
            msgValue = amount;
            // No approval is needed since native tokens don't use allowances.
            // Note: balance check is performed within `Address.sendValue` or `Address.functionCallWithValue` below.
        } else {
            // For ERC20 tokens, grant unlimited approval to the target if the current allowance is insufficient.
            // This is safe since the contract doesn't custody tokens between zaps.
            if (IERC20(token).allowance(address(this), target) < amount) {
                IERC20(token).forceApprove(target, type(uint256).max);
            }
            // Note: balance check is omitted as the target contract will revert if there are insufficient funds.
        }
        // Construct the payload for the target contract call with the Zap action.
        // The payload is modified to replace the placeholder amount with the actual amount.
        bytes memory payload = zapData.payload(amount);
        if (payload.length == 0 && token == NATIVE_GAS_TOKEN) {
            // Zap Action in a form of native gas token transfer to the target is requested.
            // Note: we avoid using `functionCallWithValue` because the target might be an EOA. This will
            // revert with a generic custom error should the target contract revert on incoming transfer.
            Address.sendValue({recipient: payable(target), amount: msgValue});
        } else {
            // Perform the Zap action, forwarding the requested native value to the target contract.
            // Note: this will bubble up any revert from the target contract, and revert if target is EOA.
            Address.functionCallWithValue({target: target, data: payload, value: msgValue});
        }
        // Forward the final token to the specified recipient, if required.
        _checkBalanceAndForward({
            token: zapData.finalToken(),
            forwardTo: zapData.forwardTo(),
            minFinalBalance: zapData.minFinalBalance()
        });
        // Return function selector to indicate successful execution
        return this.zap.selector;
    }

    /// @notice Encodes the ZapData for a Zap action.
    /// @dev At the time of encoding, we don't know the exact amount of tokens that will be used for the Zap,
    /// as we don't have a quote for performing a Zap. Therefore, a placeholder value for the amount must be used
    /// when ABI-encoding the payload. A reference index where the actual amount is encoded within the payload
    /// must be provided in order to replace the placeholder with the actual amount when the Zap is performed.
    /// @param target           Address of the target contract.
    /// @param payload          ABI-encoded calldata to be used for the `target` contract call.
    ///                         If the target function has the token amount as an argument, any placeholder amount value
    ///                         can be used for the original ABI encoding of `payload`. The placeholder amount will
    ///                         be replaced with the actual amount when the Zap Data is decoded.
    /// @param amountPosition   Position (start index) where the token amount is encoded within `payload`.
    ///                         This will usually be `4 + 32 * n`, where `n` is the position of the token amount in
    ///                         the list of parameters of the target function (starting from 0).
    ///                         Any value greater than or equal to `payload.length` can be used if the token amount is
    ///                         not an argument of the target function.
    /// @param finalToken       The token produced as a result of the Zap action (ERC20 or native gas token).
    ///                         A zero address value signals that the Zap action doesn't result in any asset per se,
    ///                         like bridging or depositing into a vault without an LP token.
    ///                         Note: this parameter must be set to a non-zero value if the `forwardTo` parameter is
    ///                         set to a non-zero value.
    /// @param forwardTo        The address to which `finalToken` should be forwarded. This parameter is required only
    ///                         if the Zap action does not automatically transfer the token to the intended recipient.
    ///                         Otherwise, it must be set to address(0).
    /// @param minFinalBalance  The minimum balance of `finalToken` to have after performing the Zap action.
    ///                         This parameter could be used to implement slippage protection for a Zap action that does
    ///                         not automatically transfer the token to the intended recipient. Otherwise, it must be
    ///                         set to 0.
    function encodeZapData(
        address target,
        bytes memory payload,
        uint256 amountPosition,
        address finalToken,
        address forwardTo,
        uint256 minFinalBalance
    )
        external
        pure
        returns (bytes memory)
    {
        // External integrations do not need to understand the specific `AMOUNT_NOT_PRESENT` semantics.
        // Therefore, they can specify any value greater than or equal to `payload.length` to indicate
        // that the amount is not present in the payload.
        if (amountPosition >= payload.length) {
            amountPosition = ZapDataV1.AMOUNT_NOT_PRESENT;
        }
        // At this point, we have checked that `amountPosition` fits in uint16, so we can safely cast it.
        return ZapDataV1.encodeV1({
            amountPosition_: uint16(amountPosition),
            finalToken_: finalToken,
            forwardTo_: forwardTo,
            minFinalBalance_: minFinalBalance,
            target_: target,
            payload_: payload
        });
    }

    /// @notice Decodes the ZapData for a Zap action. Replaces the placeholder amount with the actual amount,
    /// if it was present in the original `payload`. Otherwise, returns the original `payload` as is.
    /// @param zapData          Encoded Zap Data containing the target address and calldata for the Zap action.
    /// @param amount           Actual amount of the token to be used for the Zap action.
    function decodeZapData(
        bytes calldata zapData,
        uint256 amount
    )
        public
        pure
        returns (address target, bytes memory payload)
    {
        zapData.validateV1();
        target = zapData.target();
        payload = zapData.payload(amount);
    }

    /// @notice Forwards the proceeds of the Zap action to the specified non-zero recipient.
    function _checkBalanceAndForward(address token, address forwardTo, uint256 minFinalBalance) internal {
        // Do nothing if both forwarding and minimum balance checks are not required.
        if (forwardTo == address(0) && minFinalBalance == 0) {
            return;
        }
        // Check the token address and its balance to be safely forwarded.
        if (token == address(0)) revert TokenZapV1__FinalTokenNotSpecified();
        // Perform the balance check before forwarding.
        uint256 amount = token == NATIVE_GAS_TOKEN ? address(this).balance : IERC20(token).balanceOf(address(this));
        if (amount == 0 || amount < minFinalBalance) revert TokenZapV1__FinalBalanceBelowMin();
        // Forward the full balance of the final token to the specified recipient, if required.
        if (forwardTo == address(0)) return;
        if (token == NATIVE_GAS_TOKEN) {
            Address.sendValue({recipient: payable(forwardTo), amount: amount});
        } else {
            IERC20(token).safeTransfer(forwardTo, amount);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Interface for contracts that can perform Zap operations. Such contracts could be used as Recipients
/// in a FastBridge transaction that includes a Zap operation. The Zap Data should include instructions on how
/// exactly the Zap operation should be executed, which would typically include the target address and calldata
/// to use. The exact implementation of the Zap Data encoding is up to the Recipient contract.
interface IZapRecipient {
    /// @notice Performs a Zap operation with the given token and amount according to the provided Zap data.
    /// @param token    The address of the token being used for the Zap operation.
    /// @param amount   The amount of tokens to be used.
    /// @param zapData  The encoded data specifying how the Zap operation should be executed.
    /// @return         The function selector to indicate successful execution.
    function zap(address token, uint256 amount, bytes memory zapData) external payable returns (bytes4);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

// solhint-disable no-inline-assembly
library ZapDataV1 {
    /// @notice Version of the Zap Data struct.
    uint16 internal constant VERSION = 1;

    /// @notice Value that indicates the amount is not present in the target function's payload.
    uint16 internal constant AMOUNT_NOT_PRESENT = 0xFFFF;

    // Offsets of the fields in the packed ZapData struct
    // uint16   version                 [000 .. 002)
    // uint16   amountPosition          [002 .. 004)
    // address  finalToken              [004 .. 024)
    // address  forwardTo               [024 .. 044)
    // uint256  minFinalBalance         [044 .. 076)
    // address  target                  [076 .. 096)
    // bytes    payload                 [096 .. ***)

    // forgefmt: disable-start
    uint256 private constant OFFSET_AMOUNT_POSITION   = 2;
    uint256 private constant OFFSET_FINAL_TOKEN       = 4;
    uint256 private constant OFFSET_FORWARD_TO        = 24;
    uint256 private constant OFFSET_MIN_FINAL_BALANCE = 44;
    uint256 private constant OFFSET_TARGET            = 76;
    uint256 private constant OFFSET_PAYLOAD           = 96;
    // forgefmt: disable-end

    error ZapDataV1__InvalidEncoding();
    error ZapDataV1__FinalTokenNotSpecified();
    error ZapDataV1__PayloadLengthAboveMax();
    error ZapDataV1__TargetZeroAddress();
    error ZapDataV1__UnsupportedVersion(uint16 version);

    /// @notice Validates that encodedZapData is a tightly packed encoded payload for ZapData struct.
    /// @dev Checks that all the required fields are present and the version is correct.
    function validateV1(bytes calldata encodedZapData) internal pure {
        // Check the minimum length: must at least include all static fields.
        if (encodedZapData.length < OFFSET_PAYLOAD) revert ZapDataV1__InvalidEncoding();
        // Once we validated the length, we can be sure that the version field is present.
        uint16 version_ = version(encodedZapData);
        if (version_ != VERSION) revert ZapDataV1__UnsupportedVersion(version_);
    }

    /// @notice Encodes the ZapData struct by tightly packing the fields.
    /// Note: we don't know the exact amount of tokens that will be used for the Zap at the time of encoding,
    /// so we provide the reference index where the token amount is encoded within `payload_`. This allows us to
    /// hot-swap the token amount in the payload, when the Zap is performed.
    /// @dev `abi.decode` will not work as a result of the tightly packed fields. Use `decodeZapData` instead.
    /// @param amountPosition_  Position (start index) where the token amount is encoded within `payload_`.
    ///                         This will usually be `4 + 32 * n`, where `n` is the position of the token amount in
    ///                         the list of parameters of the target function (starting from 0).
    ///                         Or `AMOUNT_NOT_PRESENT` if the token amount is not encoded within `payload_`.
    /// @param finalToken_      The token produced as a result of the Zap action (ERC20 or native gas token).
    ///                         A zero address value signals that the Zap action doesn't result in any asset per se,
    ///                         like bridging or depositing into a vault without an LP token.
    ///                         Note: this parameter must be set to a non-zero value if either `forwardTo_` or
    ///                         `minFinalBalance_` is set to a non-zero value.
    /// @param forwardTo_       The address to which `finalToken` should be forwarded. This parameter is required only
    ///                         if the Zap action does not automatically transfer the token to the intended recipient.
    ///                         Otherwise, it must be set to address(0).
    /// @param minFinalBalance_ The minimum balance of `finalToken` to have after performing the Zap action.
    ///                         This parameter could be used to implement slippage protection for a Zap action that does
    ///                         not automatically transfer the token to the intended recipient. Otherwise, it must be
    ///                         set to 0.
    /// @param target_          Address of the target contract.
    /// @param payload_         ABI-encoded calldata to be used for the `target_` contract call.
    ///                         If the target function has the token amount as an argument, any placeholder amount value
    ///                         can be used for the original ABI encoding of `payload_`. The placeholder amount will
    ///                         be replaced with the actual amount, when the Zap Data is decoded.
    function encodeV1(
        uint16 amountPosition_,
        address finalToken_,
        address forwardTo_,
        uint256 minFinalBalance_,
        address target_,
        bytes memory payload_
    )
        internal
        pure
        returns (bytes memory encodedZapData)
    {
        if (target_ == address(0)) revert ZapDataV1__TargetZeroAddress();
        // We use uint16 to represent the amount position within the payload, so its length must fit in uint16.
        if (payload_.length > AMOUNT_NOT_PRESENT) revert ZapDataV1__PayloadLengthAboveMax();
        // Amount is encoded in [amountPosition_ .. amountPosition_ + 32), which should be within the payload.
        if (amountPosition_ != AMOUNT_NOT_PRESENT && (uint256(amountPosition_) + 32 > payload_.length)) {
            revert ZapDataV1__InvalidEncoding();
        }
        // Final token needs to be specified if forwarding is required.
        if (forwardTo_ != address(0) && finalToken_ == address(0)) {
            revert ZapDataV1__FinalTokenNotSpecified();
        }
        // Final token needs to be specified if minimum balance check is required.
        if (minFinalBalance_ != 0 && finalToken_ == address(0)) {
            revert ZapDataV1__FinalTokenNotSpecified();
        }
        return abi.encodePacked(VERSION, amountPosition_, finalToken_, forwardTo_, minFinalBalance_, target_, payload_);
    }

    /// @notice Extracts the version from the encoded Zap Data.
    function version(bytes calldata encodedZapData) internal pure returns (uint16 version_) {
        // Load 32 bytes from the start and shift it 240 bits to the right to get the highest 16 bits.
        assembly {
            version_ := shr(240, calldataload(encodedZapData.offset))
        }
    }

    /// @notice Extracts the finalToken address from the encoded Zap Data.
    function finalToken(bytes calldata encodedZapData) internal pure returns (address finalToken_) {
        // Load 32 bytes from the offset and shift it 96 bits to the right to get the highest 160 bits.
        assembly {
            finalToken_ := shr(96, calldataload(add(encodedZapData.offset, OFFSET_FINAL_TOKEN)))
        }
    }

    /// @notice Extracts the forwardTo address from the encoded Zap Data.
    function forwardTo(bytes calldata encodedZapData) internal pure returns (address forwardTo_) {
        // Load 32 bytes from the offset and shift it 96 bits to the right to get the highest 160 bits.
        assembly {
            forwardTo_ := shr(96, calldataload(add(encodedZapData.offset, OFFSET_FORWARD_TO)))
        }
    }

    /// @notice Extracts the minimum final balance from the encoded Zap Data.
    function minFinalBalance(bytes calldata encodedZapData) internal pure returns (uint256 minFinalBalance_) {
        // Load 32 bytes from the offset. No shift is applied, as we need the full 256 bits.
        assembly {
            minFinalBalance_ := calldataload(add(encodedZapData.offset, OFFSET_MIN_FINAL_BALANCE))
        }
    }

    /// @notice Extracts the target address from the encoded Zap Data.
    function target(bytes calldata encodedZapData) internal pure returns (address target_) {
        // Load 32 bytes from the offset and shift it 96 bits to the right to get the highest 160 bits.
        assembly {
            target_ := shr(96, calldataload(add(encodedZapData.offset, OFFSET_TARGET)))
        }
    }

    /// @notice Extracts the payload from the encoded Zap Data. Replaces the token amount with the provided value,
    /// if it was present in the original data (if amountPosition is not AMOUNT_NOT_PRESENT).
    /// @dev This payload will be used as a calldata for the target contract.
    function payload(bytes calldata encodedZapData, uint256 amount) internal pure returns (bytes memory) {
        // The original payload is located at encodedZapData[OFFSET_PAYLOAD:].
        uint16 amountPosition = _amountPosition(encodedZapData);
        // If the amount was not present in the original payload, return the payload as is.
        if (amountPosition == AMOUNT_NOT_PRESENT) {
            return encodedZapData[OFFSET_PAYLOAD:];
        }
        // Calculate the start and end indexes of the amount in ZapData from its position within the payload.
        // Note: we use inclusive start and exclusive end indexes for easier slicing of the ZapData.
        uint256 amountStartIndexIncl = OFFSET_PAYLOAD + amountPosition;
        uint256 amountEndIndexExcl = amountStartIndexIncl + 32;
        // Check that the amount is within the ZapData.
        if (amountEndIndexExcl > encodedZapData.length) revert ZapDataV1__InvalidEncoding();
        // Otherwise we need to replace the amount in the payload with the provided value.
        return abi.encodePacked(
            // Copy the original payload up to the amount
            encodedZapData[OFFSET_PAYLOAD:amountStartIndexIncl],
            // Replace the originally encoded amount with the provided value
            amount,
            // Copy the rest of the payload after the amount
            encodedZapData[amountEndIndexExcl:]
        );
    }

    /// @notice Extracts the amount position from the encoded Zap Data.
    function _amountPosition(bytes calldata encodedZapData) private pure returns (uint16 amountPosition) {
        // Load 32 bytes from the offset and shift it 240 bits to the right to get the highest 16 bits.
        assembly {
            amountPosition := shr(240, calldataload(add(encodedZapData.offset, OFFSET_AMOUNT_POSITION)))
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @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);
}

{
  "remappings": [
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@synapsecns/=node_modules/@synapsecns/",
    "forge-std/=node_modules/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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