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// SPDX-License-Identifier: AGPL-3.0-or-later

/// join-7-auth.sol -- Non-standard token adapters

// Copyright (C) 2018 Rain <[email protected]>
// Copyright (C) 2018-2020 Maker Ecosystem Growth Holdings, INC.
//
// 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 VatLike {
    function slip(bytes32, address, int256) external;
}

interface GemLike {
    function decimals() external view returns (uint256);
    function transfer(address, uint256) external;
    function transferFrom(address, address, uint256) external;
    function balanceOf(address) external view returns (uint256);
    function upgradedAddress() external view returns (address);
}

// AuthGemJoin7
// For an upgradable token (like USDT) which doesn't return bool on transfers and may charge fees
//  If the token is deprecated changing the implementation behind, this prevents joins
//   and exits until the implementation is reviewed and approved by governance.

contract AuthGemJoin7 {
    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); _; }

    VatLike public immutable vat;
    bytes32 public immutable ilk;
    GemLike public immutable gem;
    uint256 public immutable dec;
    uint256 public live; // Access flag

    // Events
    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event Join(address indexed usr, uint256 amt, address indexed msgSender);
    event Exit(address indexed usr, uint256 amt);
    event Cage();
    event SetImplementation(address indexed implementation, uint256 permitted);

    mapping (address => uint256) public implementations;

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        gem = GemLike(gem_);
        uint256 dec_ = dec = GemLike(gem_).decimals();
        require(dec_ < 18, "AuthGemJoin7/decimals-18-or-higher");
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        ilk = ilk_;
        setImplementation(address(GemLike(gem_).upgradedAddress()), 1);
        emit Rely(msg.sender);
    }

    function cage() external auth {
        live = 0;
        emit Cage();
    }

    function setImplementation(address implementation, uint256 permitted) public auth {
        implementations[implementation] = permitted; // 1 live, 0 disable
        emit SetImplementation(implementation, permitted);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "AuthGemJoin7/overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "AuthGemJoin7/underflow");
    }

    function join(address usr, uint256 amt, address msgSender) external auth returns (uint256 wad) {
        require(live == 1, "AuthGemJoin7/not-live");
        require(implementations[gem.upgradedAddress()] == 1, "AuthGemJoin7/implementation-invalid");
        uint256 bal = gem.balanceOf(address(this));
        gem.transferFrom(msgSender, address(this), amt);
        uint256 actualAmt = sub(gem.balanceOf(address(this)), bal);
        wad = mul(actualAmt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "AuthGemJoin7/overflow");
        vat.slip(ilk, usr, int256(wad));
        emit Join(usr, actualAmt, msgSender);
    }

    function exit(address usr, uint256 amt) external {
        uint256 wad = mul(amt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "AuthGemJoin7/overflow");
        require(implementations[gem.upgradedAddress()] == 1, "AuthGemJoin7/implementation-invalid");
        vat.slip(ilk, msg.sender, -int256(wad));
        gem.transfer(usr, amt);
        emit Exit(usr, amt);
    }
}

{
  "remappings": [
    "ds-test/=lib/ds-auth/lib/ds-test/src/",
    "ds-thing/=lib/ds-value/lib/ds-thing/src/",
    "ds-value/=lib/ds-value/src/",
    "forge-std/=lib/forge-std/src/",
    "psm/=lib/psm/src/",
    "ds-token/=lib/ds-token/src/",
    "ds-auth/=lib/ds-auth/src/",
    "erc4626-tests/=lib/erc4626-tests/",
    "ds-math/=lib/ds-token/lib/ds-math/src/",
    "ds-note/=lib/ds-value/lib/ds-thing/lib/ds-note/src/",
    "usddv2/=lib/psm/lib/usddv2/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "istanbul"
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"vat_","type":"address"},{"internalType":"bytes32","name":"ilk_","type":"bytes32"},{"internalType":"address","name":"gem_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Cage","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Deny","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":false,"internalType":"uint256","name":"amt","type":"uint256"}],"name":"Exit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":false,"internalType":"uint256","name":"amt","type":"uint256"},{"indexed":true,"internalType":"address","name":"msgSender","type":"address"}],"name":"Join","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Rely","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"},{"indexed":false,"internalType":"uint256","name":"permitted","type":"uint256"}],"name":"SetImplementation","type":"event"},{"inputs":[],"name":"cage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dec","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"}],"name":"exit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"gem","outputs":[{"internalType":"contract GemLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ilk","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"implementations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"amt","type":"uint256"},{"internalType":"address","name":"msgSender","type":"address"}],"name":"join","outputs":[{"internalType":"uint256","name":"wad","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"live","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":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"permitted","type":"uint256"}],"name":"setImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vat","outputs":[{"internalType":"contract VatLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000ff77f6209239deb2c076179499f2346b0032097f50534d2d555344542d4100000000000000000000000000000000000000000000000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7

-----Decoded View---------------
Arg [0] : vat_ (address): 0xFf77F6209239DEB2c076179499f2346b0032097f
Arg [1] : ilk_ (bytes32): 0x50534d2d555344542d4100000000000000000000000000000000000000000000
Arg [2] : gem_ (address): 0xdAC17F958D2ee523a2206206994597C13D831ec7

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000ff77f6209239deb2c076179499f2346b0032097f
Arg [1] : 50534d2d555344542d4100000000000000000000000000000000000000000000
Arg [2] : 000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7