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// SPDX-License-Identifier: MIT
// Thanks to ultrasecr.eth
pragma solidity ^0.8.19;

import { IMorphoFlashLoanCallback } from "./interfaces/IMorphoFlashLoanCallback.sol";
import { IMorpho } from "./interfaces/IMorpho.sol";

import { BaseWrapper, IERC7399, ERC20 } from "../BaseWrapper.sol";

/// @dev MorphoBlue Flash Lender that uses MorphoBlue as source of liquidity.
contract MorphoBlueWrapper is BaseWrapper, IMorphoFlashLoanCallback {
    error NotMorpho();
    error UnsupportedAsset(address asset);

    IMorpho public immutable morpho;

    constructor(IMorpho _morpho) {
        morpho = _morpho;
    }

    /// @inheritdoc IERC7399
    function maxFlashLoan(address asset) public view returns (uint256) {
        return ERC20(asset).balanceOf(address(morpho));
    }

    /// @inheritdoc IERC7399
    function flashFee(address asset, uint256 amount) external view returns (uint256) {
        uint256 max = maxFlashLoan(asset);
        if (max == 0) revert UnsupportedAsset(asset);
        return amount >= max ? type(uint256).max : 0;
    }

    function onMorphoFlashLoan(uint256 amount, bytes calldata params) external {
        if (msg.sender != address(morpho)) revert NotMorpho();
        (address asset, bytes memory data) = abi.decode(params, (address, bytes));

        _bridgeToCallback(asset, amount, 0, data);
    }

    function _flashLoan(address asset, uint256 amount, bytes memory data) internal override {
        morpho.flashLoan(asset, amount, abi.encode(asset, data));
    }
}

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

interface IMorphoFlashLoanCallback {
    function onMorphoFlashLoan(uint256 assets, bytes calldata data) external;
}

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

interface IMorpho {
    function flashLoan(address token, uint256 assets, bytes memory data) external;
}

// SPDX-License-Identifier: MIT
// Thanks to ultrasecr.eth
pragma solidity ^0.8.19;

import "erc7399/IERC7399.sol";

import { TransferHelper, ERC20 } from "./utils/TransferHelper.sol";
import { FunctionCodec } from "./utils/FunctionCodec.sol";

/// @dev All ERC7399 flash loan wrappers have the same general structure.
/// - The ERC7399 `flash` function is the entry point for the flash loan.
/// - The wrapper calls the underlying lender flash lender on their non-ERC7399 flash lending call to borrow the funds.
/// -     The lender sends the funds to the wrapper.
/// -         The wrapper receives the callback from the lender.
/// -         The wrapper sends the funds to the loan receiver.
/// -         The wrapper calls the callback supplied by the original borrower.
/// -             The callback from the original borrower executes.
/// -         Depending on the lender, the wrapper may have to approve it to pull the repayment.
/// -         If there is any data to return, it is kept in a storage variable.
/// -         The wrapper exits the callback.
/// -     The lender verifies or pulls the repayment.
/// - The wrapper returns to the original borrower the stored result of its callback.
abstract contract BaseWrapper is IERC7399 {
    using TransferHelper for address;

    struct Data {
        address loanReceiver;
        address initiator;
        function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) callback;
        bytes initiatorData;
    }

    bytes internal _callbackResult;

    /// @inheritdoc IERC7399
    /// @dev The entry point for the ERC7399 flash loan. Packs data to convert the legacy flash loan into an ERC7399
    /// flash loan. Then it calls the legacy flash loan. Once the flash loan is done, checks if there is any return
    /// data and returns it.
    function flash(
        address loanReceiver,
        address asset,
        uint256 amount,
        bytes calldata initiatorData,
        function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) callback
    )
        external
        returns (bytes memory result)
    {
        Data memory data = Data({
            loanReceiver: loanReceiver,
            initiator: msg.sender,
            callback: callback,
            initiatorData: initiatorData
        });

        return _flash(asset, amount, data);
    }

    /// @dev Alternative entry point for the ERC7399 flash loan, without function pointers. Packs data to convert the
    /// legacy flash loan into an ERC7399 flash loan. Then it calls the legacy flash loan. Once the flash loan is done,
    /// checks if there is any return data and returns it.
    function flash(
        address loanReceiver,
        address asset,
        uint256 amount,
        bytes calldata initiatorData,
        address callbackTarget,
        bytes4 callbackSelector
    )
        external
        returns (bytes memory result)
    {
        Data memory data = Data({
            loanReceiver: loanReceiver,
            initiator: msg.sender,
            callback: FunctionCodec.decodeFunction(callbackTarget, callbackSelector),
            initiatorData: initiatorData
        });

        return _flash(asset, amount, data);
    }

    function _flash(address asset, uint256 amount, Data memory data) internal virtual returns (bytes memory result) {
        _flashLoan(asset, amount, abi.encode(data));

        result = _callbackResult;
        // Avoid storage write if not needed
        if (result.length > 0) {
            delete _callbackResult;
        }
        return result;
    }

    /// @dev Call the legacy flashloan function in the child contract. This is where we borrow from Aave, Uniswap, etc.
    function _flashLoan(address asset, uint256 amount, bytes memory data) internal virtual;

    /// @dev Handle the common parts of bridging the callback from legacy to ERC7399. Transfer the funds to the loan
    /// receiver. Call the callback supplied by the original borrower. Approve the repayment if necessary. If there is
    /// any result, it is kept in a storage variable to be retrieved on `flash` after the legacy flash loan is finished.
    function _bridgeToCallback(address asset, uint256 amount, uint256 fee, bytes memory params) internal {
        Data memory data = abi.decode(params, (Data));
        _transferAssets(asset, amount, data.loanReceiver);

        // call the callback and tell the callback receiver to repay the loan to this contract
        bytes memory result = data.callback(data.initiator, _repayTo(), address(asset), amount, fee, data.initiatorData);

        _approveRepayment(asset, amount, fee);

        if (result.length > 0) {
            // if there's any result, it is kept in a storage variable to be retrieved later in this tx
            _callbackResult = result;
        }
    }

    /// @dev Transfer the assets to the loan receiver.
    /// Override it if the provider can send the funds directly
    function _transferAssets(address asset, uint256 amount, address loanReceiver) internal virtual {
        asset.safeTransfer(loanReceiver, amount);
    }

    /// @dev Approve the repayment of the loan to the provider if needed.
    /// Override it if the provider can receive the funds directly and you want to avoid the if condition
    function _approveRepayment(address asset, uint256 amount, uint256 fee) internal virtual {
        if (_repayTo() == address(this)) {
            ERC20(asset).approve(msg.sender, amount + fee);
        }
    }

    /// @dev Where should the end client send the funds to repay the loan
    /// Override it if the provider can receive the funds directly
    function _repayTo() internal view virtual returns (address) {
        return address(this);
    }
}

// SPDX-License-Identifier: CC0
pragma solidity >=0.6.4;

/// @dev Specification for flash lenders compatible with ERC-7399
interface IERC7399 {
    /// @dev The amount of currency available to be lent.
    /// @param asset The loan currency.
    /// @return The amount of `asset` that can be borrowed.
    function maxFlashLoan(address asset) external view returns (uint256);

    /// @dev The fee to be charged for a given loan.
    /// @param asset The loan currency.
    /// @param amount The amount of assets lent.
    /// @return The amount of `asset` to be charged for the loan, on top of the returned principal.
    function flashFee(address asset, uint256 amount) external view returns (uint256);

    /// @dev Initiate a flash loan.
    /// @param loanReceiver The address receiving the flash loan
    /// @param asset The asset to be loaned
    /// @param amount The amount to loaned
    /// @param data The ABI encoded user data
    /// @param callback The address and signature of the callback function
    /// @return result ABI encoded result of the callback
    function flash(
        address loanReceiver,
        address asset,
        uint256 amount,
        bytes calldata data,
        /// @dev callback. This is a combination of the callback receiver address, and the signature of callback
        /// function. It is encoded packed as 20 bytes + 4 bytes.
        /// @dev the return of the callback function is not encoded in the parameter, but must be `returns (bytes
        /// memory)` for compliance with the standard.
        /// @param initiator The address that called this function
        /// @param paymentReceiver The address that needs to receive the amount plus fee at the end of the callback
        /// @param asset The asset to be loaned
        /// @param amount The amount to loaned
        /// @param fee The fee to be paid
        /// @param data The ABI encoded data to be passed to the callback
        /// @return result ABI encoded result of the callback
        function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) callback
    ) external returns (bytes memory);
}

// SPDX-License-Identifier: MIT
// Taken from https://github.com/Uniswap/uniswap-lib/blob/master/src/libraries/TransferHelper.sol
pragma solidity ^0.8.19;

import { ERC20 } from "solmate/tokens/ERC20.sol";
import { RevertMsgExtractor } from "./RevertMsgExtractor.sol";

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
// USDT is a well known token that returns nothing for its transfer, transferFrom, and approve functions
// and part of the reason this library exists
library TransferHelper {
    /// @notice Transfers assets from msg.sender to a recipient
    /// @dev Errors with the underlying revert message if transfer fails
    /// @param asset The contract address of the asset which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(address asset, address to, uint256 value) internal {
        (bool success, bytes memory data) =
        // solhint-disable-next-line avoid-low-level-calls
         address(asset).call(abi.encodeWithSelector(ERC20.transfer.selector, to, value));
        if (!(success && (data.length == 0 || abi.decode(data, (bool))))) revert(RevertMsgExtractor.getRevertMsg(data));
    }
}

// SPDX-License-Identifier: MIT
// Thanks to ultrasecr.eth
pragma solidity ^0.8.19;

library FunctionCodec {
    function encodeParams(address contractAddr, bytes4 selector) internal pure returns (bytes24) {
        return bytes24(bytes20(contractAddr)) | bytes24(selector) >> 160;
    }

    function decodeParams(bytes24 encoded) internal pure returns (address contractAddr, bytes4 selector) {
        contractAddr = address(bytes20(encoded));
        selector = bytes4(encoded << 160);
    }

    function encodeFunction(
        function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) f
    )
        internal
        pure
        returns (bytes24)
    {
        return encodeParams(f.address, f.selector);
    }

    function decodeFunction(
        address contractAddr,
        bytes4 selector
    )
        internal
        pure
        returns (function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) f)
    {
        uint32 s = uint32(selector);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            f.address := contractAddr
            f.selector := s
        }
    }

    function decodeFunction(bytes24 encoded)
        internal
        pure
        returns (function(address, address, address, uint256, uint256, bytes memory) external returns (bytes memory) f)
    {
        (address contractAddr, bytes4 selector) = decodeParams(encoded);
        return decodeFunction(contractAddr, selector);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

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

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

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

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

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

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

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

// SPDX-License-Identifier: MIT
// Taken from
// https://github.com/sushiswap/BoringSolidity/blob/441e51c0544cf2451e6116fe00515e71d7c42e2c/src/BoringBatchable.sol

pragma solidity ^0.8.19;

library RevertMsgExtractor {
    /// @dev Helper function to extract a useful revert message from a failed call.
    /// If the returned data is malformed or not correctly abi encoded then this call can fail itself.
    function getRevertMsg(bytes memory returnData) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (returnData.length < 68) return "Transaction reverted silently";

        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Slice the sighash.
            returnData := add(returnData, 0x04)
        }
        return abi.decode(returnData, (string)); // All that remains is the revert string
    }
}

{
  "remappings": [
    "@prb/test/=lib/prb-test/src/",
    "forge-std/=lib/forge-std/src/",
    "erc7399/=lib/erc7399/src/",
    "solmate/=lib/solmate/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc3156/=lib/erc3156/contracts/",
    "prb-test/=lib/prb-test/src/",
    "registry/=lib/registry/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": false
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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[{"inputs":[{"internalType":"contract IMorpho","name":"_morpho","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"NotMorpho","type":"error"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"UnsupportedAsset","type":"error"},{"inputs":[{"internalType":"address","name":"loanReceiver","type":"address"},{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"initiatorData","type":"bytes"},{"internalType":"function (address,address,address,uint256,uint256,bytes) external returns (bytes)","name":"callback","type":"function"}],"name":"flash","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"loanReceiver","type":"address"},{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"initiatorData","type":"bytes"},{"internalType":"address","name":"callbackTarget","type":"address"},{"internalType":"bytes4","name":"callbackSelector","type":"bytes4"}],"name":"flash","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"flashFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"maxFlashLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"morpho","outputs":[{"internalType":"contract IMorpho","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"params","type":"bytes"}],"name":"onMorphoFlashLoan","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000bbbbbbbbbb9cc5e90e3b3af64bdaf62c37eeffcb
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000bbbbbbbbbb9cc5e90e3b3af64bdaf62c37eeffcb