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• interface IERC3156FlashBorrower
•    - function onFlashLoan(
• interface IERC3156FlashLender
•    - function maxFlashLoan(
•    - function flashFee(
•    - function flashLoan(
• interface IVatDaiFlashBorrower
•    - function onVatDaiFlashLoan(
• interface IVatDaiFlashLender
•    - function vatDaiFlashLoan(
• interface DaiLike
•    - function balanceOf(address)
•    - function transferFrom(address, addres ...
•    - function approve(address, uint256)
• interface DaiJoinLike
•    - function dai()
•    - function vat()
•    - function join(address, uint256)
•    - function exit(address, uint256)
• interface VatLike_4
•    - function hope(address)
•    - function dai(address)
•    - function move(address, address, uint2 ...
•    - function heal(uint256)
•    - function suck(address, address, uint2 ...
•  contract DssFlash is IERC3156Flash ... *
•    - function rely(address usr)
•    - function deny(address usr)
•    - function _add(uint256 x, uint256 y)
•    - function _mul(uint256 x, uint256 y)
•    - function file(bytes32 what, uint256 d ...
•    - function maxFlashLoan(
•    - function flashFee(
•    - function flashLoan(
•    - function vatDaiFlashLoan(
•    - function convert()
•    - function accrue()

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/**
 *Submitted for verification at Etherscan.io on 2021-06-17
*/

// hevm: flattened sources of src/flash.sol
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity =0.6.12 >=0.6.12;

////// src/interface/IERC3156FlashBorrower.sol
// Copyright (C) 2021 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity >=0.6.12; */

interface IERC3156FlashBorrower {

    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}

////// src/interface/IERC3156FlashLender.sol
// Copyright (C) 2021 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity >=0.6.12; */

/* import "./IERC3156FlashBorrower.sol"; */

interface IERC3156FlashLender {

    /**
     * @dev The amount of currency available to be lent.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(
        address token
    ) external view returns (uint256);

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

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

////// src/interface/IVatDaiFlashBorrower.sol
// Copyright (C) 2021 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity >=0.6.12; */

interface IVatDaiFlashBorrower {

    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param amount The amount of tokens lent. [rad]
     * @param fee The additional amount of tokens to repay. [rad]
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "IVatDaiFlashLoanReceiver.onVatDaiFlashLoan"
     */
    function onVatDaiFlashLoan(
        address initiator,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);

}

////// src/interface/IVatDaiFlashLender.sol
// Copyright (C) 2021 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity >=0.6.12; */

/* import "./IVatDaiFlashBorrower.sol"; */

interface IVatDaiFlashLender {

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param amount The amount of tokens lent. [rad]
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function vatDaiFlashLoan(
        IVatDaiFlashBorrower receiver,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

////// src/flash.sol
// Copyright (C) 2021 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity 0.6.12; */

/* import "./interface/IERC3156FlashLender.sol"; */
/* import "./interface/IERC3156FlashBorrower.sol"; */
/* import "./interface/IVatDaiFlashLender.sol"; */

interface DaiLike {
    function balanceOf(address) external returns (uint256);
    function transferFrom(address, address, uint256) external returns (bool);
    function approve(address, uint256) external returns (bool);
}

interface DaiJoinLike {
    function dai() external view returns (address);
    function vat() external view returns (address);
    function join(address, uint256) external;
    function exit(address, uint256) external;
}

interface VatLike_4 {
    function hope(address) external;
    function dai(address) external view returns (uint256);
    function move(address, address, uint256) external;
    function heal(uint256) external;
    function suck(address, address, uint256) external;
}

contract DssFlash is IERC3156FlashLender, IVatDaiFlashLender {

    // --- Auth ---
    function rely(address usr) external auth { wards[usr] = 1; emit Rely(usr); }
    function deny(address usr) external auth { wards[usr] = 0; emit Deny(usr); }
    mapping (address => uint256) public wards;
    modifier auth {
        require(wards[msg.sender] == 1, "DssFlash/not-authorized");
        _;
    }

    // --- Data ---
    VatLike_4     public immutable vat;
    DaiJoinLike public immutable daiJoin;
    DaiLike     public immutable dai;
    address     public immutable vow;       // vow intentionally set immutable to save gas

    uint256     public  max;     // Maximum borrowable Dai  [wad]
    uint256     public  toll;    // Fee                     [wad = 100%]
    uint256     private locked;  // Reentrancy guard

    bytes32 public constant CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan");
    bytes32 public constant CALLBACK_SUCCESS_VAT_DAI = keccak256("VatDaiFlashBorrower.onVatDaiFlashLoan");

    // --- Events ---
    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event File(bytes32 indexed what, uint256 data);
    event FlashLoan(address indexed receiver, address token, uint256 amount, uint256 fee);
    event VatDaiFlashLoan(address indexed receiver, uint256 amount, uint256 fee);

    modifier lock {
        require(locked == 0, "DssFlash/reentrancy-guard");
        locked = 1;
        _;
        locked = 0;
    }

    // --- Init ---
    constructor(address daiJoin_, address vow_) public {
        wards[msg.sender] = 1;
        emit Rely(msg.sender);

        VatLike_4 vat_ = vat = VatLike_4(DaiJoinLike(daiJoin_).vat());
        daiJoin = DaiJoinLike(daiJoin_);
        DaiLike dai_ = dai = DaiLike(DaiJoinLike(daiJoin_).dai());
        vow = vow_;

        vat_.hope(daiJoin_);
        dai_.approve(daiJoin_, type(uint256).max);
    }

    // --- Math ---
    uint256 constant WAD = 10 ** 18;
    uint256 constant RAY = 10 ** 27;
    uint256 constant RAD = 10 ** 45;
    function _add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x);
    }
    function _mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x);
    }

    // --- Administration ---
    function file(bytes32 what, uint256 data) external auth {
        if (what == "max") {
            // Add an upper limit of 10^27 DAI to avoid breaking technical assumptions of DAI << 2^256 - 1
            require((max = data) <= RAD, "DssFlash/ceiling-too-high");
        } else if (what == "toll") toll = data;
        else revert("DssFlash/file-unrecognized-param");
        emit File(what, data);
    }

    // --- ERC 3156 Spec ---
    function maxFlashLoan(
        address token
    ) external override view returns (uint256) {
        if (token == address(dai) && locked == 0) {
            return max;
        } else {
            return 0;
        }
    }
    function flashFee(
        address token,
        uint256 amount
    ) external override view returns (uint256) {
        require(token == address(dai), "DssFlash/token-unsupported");

        return _mul(amount, toll) / WAD;
    }
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external override lock returns (bool) {
        require(token == address(dai), "DssFlash/token-unsupported");
        require(amount <= max, "DssFlash/ceiling-exceeded");

        uint256 amt = _mul(amount, RAY);
        uint256 fee = _mul(amount, toll) / WAD;
        uint256 total = _add(amount, fee);

        vat.suck(address(this), address(this), amt);
        daiJoin.exit(address(receiver), amount);

        emit FlashLoan(address(receiver), token, amount, fee);

        require(
            receiver.onFlashLoan(msg.sender, token, amount, fee, data) == CALLBACK_SUCCESS,
            "DssFlash/callback-failed"
        );

        dai.transferFrom(address(receiver), address(this), total); // The fee is also enforced here
        daiJoin.join(address(this), total);
        vat.heal(amt);

        return true;
    }

    // --- Vat Dai Flash Loan ---
    function vatDaiFlashLoan(
        IVatDaiFlashBorrower receiver,          // address of conformant IVatDaiFlashBorrower
        uint256 amount,                         // amount to flash loan [rad]
        bytes calldata data                     // arbitrary data to pass to the receiver
    ) external override lock returns (bool) {
        require(amount <= _mul(max, RAY), "DssFlash/ceiling-exceeded");

        uint256 prev = vat.dai(address(this));
        uint256 fee = _mul(amount, toll) / WAD;

        vat.suck(address(this), address(receiver), amount);

        emit VatDaiFlashLoan(address(receiver), amount, fee);

        require(
            receiver.onVatDaiFlashLoan(msg.sender, amount, fee, data) == CALLBACK_SUCCESS_VAT_DAI,
            "DssFlash/callback-failed"
        );

        vat.heal(amount);
        require(vat.dai(address(this)) >= _add(prev, fee), "DssFlash/insufficient-fee");

        return true;
    }

    function convert() external lock {
        daiJoin.join(address(this), dai.balanceOf(address(this)));
    }

    function accrue() external lock {
        vat.move(address(this), vow, vat.dai(address(this)));
    }
}

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0000000000000000000000009759a6ac90977b93b58547b4a71c78317f391a28000000000000000000000000a950524441892a31ebddf91d3ceefa04bf454466

-----Decoded View---------------
Arg [0] : daiJoin_ (address): 0x9759A6Ac90977b93B58547b4A71c78317f391A28
Arg [1] : vow_ (address): 0xA950524441892A31ebddF91d3cEEFa04Bf454466

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000009759a6ac90977b93b58547b4a71c78317f391a28
Arg [1] : 000000000000000000000000a950524441892a31ebddf91d3ceefa04bf454466

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ipfs://2d33df4a3e1743c69ab21cab7f8f112a87fe7d5a66d47e439bc2b2f4419920d2