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// SPDX-License-Identifier: AGPL-3.0-or-later
// 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 ^0.7.6;

interface TokenLike {
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool success);

    function balanceOf(address account) external view returns (uint256);
}

interface StarkNetLike {
    function sendMessageToL2(
        uint256 to,
        uint256 selector,
        uint256[] calldata payload
    ) external returns (bytes32);

    function consumeMessageFromL2(
        uint256 from,
        uint256[] calldata payload
    ) external returns (bytes32);

    function startL1ToL2MessageCancellation(
        uint256 toAddress,
        uint256 selector,
        uint256[] calldata payload,
        uint256 nonce
    ) external;

    function cancelL1ToL2Message(
        uint256 toAddress,
        uint256 selector,
        uint256[] calldata payload,
        uint256 nonce
    ) external;
}

contract L1DAIBridge {
    // --- Auth ---
    mapping(address => uint256) public wards;

    function rely(address usr) external auth {
        wards[usr] = 1;
        emit Rely(usr);
    }

    function deny(address usr) external auth {
        wards[usr] = 0;
        emit Deny(usr);
    }

    modifier auth() {
        require(wards[msg.sender] == 1, "L1DAIBridge/not-authorized");
        _;
    }

    event Rely(address indexed usr);
    event Deny(address indexed usr);


    uint256 public isOpen = 1;

    modifier whenOpen() {
        require(isOpen == 1, "L1DAIBridge/closed");
        _;
    }

    function close() external auth {
        isOpen = 0;
        emit Closed();
    }

    event Closed();

    address public immutable starkNet;
    address public immutable dai;
    uint256 public immutable l2Dai;
    address public immutable escrow;
    uint256 public immutable l2DaiBridge;

    uint256 public ceiling = 0;
    uint256 public maxDeposit = type(uint256).max;

    uint256 constant HANDLE_WITHDRAW = 0;

    // src/starkware/cairo/lang/cairo_constants.py
    //  2 ** 251 + 17 * 2 ** 192 + 1;
    uint256 constant SN_PRIME =
        3618502788666131213697322783095070105623107215331596699973092056135872020481;

    //  from starkware.starknet.compiler.compile import get_selector_from_name
    //  print(get_selector_from_name('handle_deposit'))
    uint256 constant DEPOSIT =
        1285101517810983806491589552491143496277809242732141897358598292095611420389;

    //  print(get_selector_from_name('handle_force_withdrawal'))
    uint256 constant FORCE_WITHDRAW =
        1137729855293860737061629600728503767337326808607526258057644140918272132445;

    event LogCeiling(uint256 ceiling);
    event LogMaxDeposit(uint256 maxDeposit);
    event LogDeposit(address indexed l1Sender, uint256 amount, uint256 l2Recipient);
    event LogWithdrawal(address indexed l1Recipient, uint256 amount);
    event LogForceWithdrawal(address indexed l1Recipient, uint256 amount, uint256 indexed l2Sender);
    event LogStartDepositCancellation(uint256 indexed l2Receipient, uint256 amount, uint256 nonce);
    event LogCancelDeposit(
        uint256 indexed l2Recipient, address l1Recipient, uint256 amount, uint256 nonce
    );

    constructor(
        address _starkNet,
        address _dai,
        uint256 _l2Dai,
        address _escrow,
        uint256 _l2DaiBridge
    ) {
        wards[msg.sender] = 1;
        emit Rely(msg.sender);

        starkNet = _starkNet;
        dai = _dai;
        l2Dai = _l2Dai;
        escrow = _escrow;
        l2DaiBridge = _l2DaiBridge;
    }

    function setCeiling(uint256 _ceiling) external auth whenOpen {
        ceiling = _ceiling;
        emit LogCeiling(_ceiling);
    }

    function setMaxDeposit(uint256 _maxDeposit) external auth whenOpen {
        maxDeposit = _maxDeposit;
        emit LogMaxDeposit(_maxDeposit);
    }

    // slither-disable-next-line similar-names
    function deposit(
        uint256 amount,
        uint256 l2Recipient
    ) external whenOpen {
        emit LogDeposit(msg.sender, amount, l2Recipient);

        require(l2Recipient != 0 && l2Recipient != l2Dai && l2Recipient < SN_PRIME, "L1DAIBridge/invalid-address");

        require(amount <= maxDeposit, "L1DAIBridge/above-max-deposit");

        TokenLike(dai).transferFrom(msg.sender, escrow, amount);

        require(
            TokenLike(dai).balanceOf(escrow) <= ceiling,
            "L1DAIBridge/above-ceiling"
        );

        uint256[] memory payload = new uint256[](4);
        payload[0] = l2Recipient;
        (payload[1], payload[2]) = toSplitUint(amount);
        payload[3] = uint256(uint160(msg.sender));

        StarkNetLike(starkNet).sendMessageToL2(l2DaiBridge, DEPOSIT, payload);
    }

    function toSplitUint(uint256 value) internal pure returns (uint256, uint256) {
      uint256 low = value & ((1 << 128) - 1);
      uint256 high = value >> 128;
      return (low, high);
    }

    // slither-disable-next-line similar-names
    function withdraw(uint256 amount, address l1Recipient) external {
        emit LogWithdrawal(l1Recipient, amount);

        uint256[] memory payload = new uint256[](4);
        payload[0] = HANDLE_WITHDRAW;
        payload[1] = uint256(uint160(msg.sender));
        (payload[2], payload[3]) = toSplitUint(amount);

        StarkNetLike(starkNet).consumeMessageFromL2(l2DaiBridge, payload);
        TokenLike(dai).transferFrom(escrow, l1Recipient, amount);
    }

    function forceWithdrawal(uint256 amount, uint256 l2Sender) external whenOpen {
        emit LogForceWithdrawal(msg.sender, amount, l2Sender);

        uint256[] memory payload = new uint256[](4);
        payload[0] = l2Sender;
        payload[1] = uint256(uint160(msg.sender));
        (payload[2], payload[3]) = toSplitUint(amount);

        StarkNetLike(starkNet).sendMessageToL2(l2DaiBridge, FORCE_WITHDRAW, payload);
    }

    function startDepositCancellation(
        uint256 amount,
        uint256 l2Recipient,
        uint256 nonce
    ) external {
        emit LogStartDepositCancellation(l2Recipient, amount, nonce);

        uint256[] memory payload = new uint256[](4);
        payload[0] = l2Recipient;
        (payload[1], payload[2]) = toSplitUint(amount);
        payload[3] = uint256(uint160(msg.sender));

        StarkNetLike(starkNet).startL1ToL2MessageCancellation(l2DaiBridge, DEPOSIT, payload, nonce);
    }

    function cancelDeposit(
        uint256 amount,
        uint256 l2Recipient,
        // slither-disable-next-line similar-names
        address l1Recipient,
        uint256 nonce
    ) external {
        emit LogCancelDeposit(l2Recipient, l1Recipient, amount, nonce);

        uint256[] memory payload = new uint256[](4);
        payload[0] = l2Recipient;
        (payload[1], payload[2]) = toSplitUint(amount);
        payload[3] = uint256(uint160(msg.sender));

        StarkNetLike(starkNet).cancelL1ToL2Message(l2DaiBridge, DEPOSIT, payload, nonce);
        TokenLike(dai).transferFrom(escrow, l1Recipient, amount);
    }
}

{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_starkNet","type":"address"},{"internalType":"address","name":"_dai","type":"address"},{"internalType":"uint256","name":"_l2Dai","type":"uint256"},{"internalType":"address","name":"_escrow","type":"address"},{"internalType":"uint256","name":"_l2DaiBridge","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Closed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Deny","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"l2Recipient","type":"uint256"},{"indexed":false,"internalType":"address","name":"l1Recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"LogCancelDeposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"ceiling","type":"uint256"}],"name":"LogCeiling","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"l1Sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"l2Recipient","type":"uint256"}],"name":"LogDeposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"l1Recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"l2Sender","type":"uint256"}],"name":"LogForceWithdrawal","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maxDeposit","type":"uint256"}],"name":"LogMaxDeposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"l2Receipient","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"LogStartDepositCancellation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"l1Recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LogWithdrawal","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Rely","type":"event"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"l2Recipient","type":"uint256"},{"internalType":"address","name":"l1Recipient","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"cancelDeposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"ceiling","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"close","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dai","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"l2Recipient","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"escrow","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"l2Sender","type":"uint256"}],"name":"forceWithdrawal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isOpen","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2Dai","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2DaiBridge","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxDeposit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_ceiling","type":"uint256"}],"name":"setCeiling","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxDeposit","type":"uint256"}],"name":"setMaxDeposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"starkNet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"l2Recipient","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"startDepositCancellation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"l1Recipient","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000c662c410c0ecf747543f5ba90660f6abebd9c8c40000000000000000000000006b175474e89094c44da98b954eedeac495271d0f00da114221cb83fa859dbdb4c44beeaa0bb37c7537ad5ae66fe5e0efd20e6eb30000000000000000000000000437465dfb5b79726e35f08559b0cbea55bb585c001108cdbe5d82737b9057590adaf97d34e74b5452f0628161d237746b6fe69e

-----Decoded View---------------
Arg [0] : _starkNet (address): 0xc662c410C0ECf747543f5bA90660f6ABeBD9C8c4
Arg [1] : _dai (address): 0x6B175474E89094C44Da98b954EedeAC495271d0F
Arg [2] : _l2Dai (uint256): 385291772725090318157700937045086145273563247402457518748197066808155336371
Arg [3] : _escrow (address): 0x0437465dfb5B79726e35F08559B0cBea55bb585C
Arg [4] : _l2DaiBridge (uint256): 30097160908876648820186558578205092597541264579458245618642493561688286878

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000c662c410c0ecf747543f5ba90660f6abebd9c8c4
Arg [1] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [2] : 00da114221cb83fa859dbdb4c44beeaa0bb37c7537ad5ae66fe5e0efd20e6eb3
Arg [3] : 0000000000000000000000000437465dfb5b79726e35f08559b0cbea55bb585c
Arg [4] : 001108cdbe5d82737b9057590adaf97d34e74b5452f0628161d237746b6fe69e