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Outline

• interface GemLike
•    - function balanceOf(address)
•    - function burn(uint256)
•    - function transfer(address, uint256)
•    - function transferFrom(address, addres ...
• interface EndLike
•    - function live()
•    - function vat()
•    - function cage()
• interface DenyLike
•    - function deny(address)
•  contract ESM *
•    - function revokesGovernanceAccess()
•    - function add(uint256 x, uint256 y)
•    - function rely(address usr)
•    - function deny(address usr)
•    - function file(bytes32 what, uint256 d ...
•    - function file(bytes32 what, address d ...
•    - function cage()
•    - function fire()
•    - function denyProxy(address target)
•    - function join(uint256 wad)
•    - function burn()

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/**
 *Submitted for verification at Etherscan.io on 2022-02-02
*/

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity >=0.6.12;

////// src/ESM.sol

/// ESM.sol

// Copyright (C) 2019-2022 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 GemLike {
    function balanceOf(address) external view returns (uint256);

    function burn(uint256) external;

    function transfer(address, uint256) external returns (bool);

    function transferFrom(address, address, uint256) external returns (bool);
}

interface EndLike {
    function live() external view returns (uint256);

    function vat() external view returns (address);

    function cage() external;
}

interface DenyLike {
    function deny(address) external;
}

contract ESM {

    uint256 constant WAD = 10 ** 18;

    GemLike public immutable gem;   // collateral (MKR token)
    address public immutable proxy; // Pause proxy

    mapping(address => uint256) public wards; // auth
    mapping(address => uint256) public sum;   // per-address balance

    uint256 public Sum;  // total balance
    uint256 public min;  // minimum activation threshold [wad]
    EndLike public end;  // cage module
    uint256 public live; // active flag

    event Fire();
    event Join(address indexed usr, uint256 wad);
    event File(bytes32 indexed what, uint256 data);
    event File(bytes32 indexed what, address data);
    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event DenyProxy(address indexed base, address indexed pause);

    constructor(address gem_, address end_, address proxy_, uint256 min_) public {
        gem = GemLike(gem_);
        end = EndLike(end_);
        proxy = proxy_;
        min = min_;
        live = 1;

        wards[msg.sender] = 1;
        emit Rely(msg.sender);
    }

    function revokesGovernanceAccess() external view returns (bool ret) {
        ret = proxy != address(0);
    }

    // -- math --
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x + y;
        require(z >= x);
    }

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

    // -- admin --
    function file(bytes32 what, uint256 data) external auth {
        if (what == "min") {
            require(data > WAD, "ESM/min-too-small");
            min = data;
        } else {
            revert("ESM/file-unrecognized-param");
        }

        emit File(what, data);
    }

    function file(bytes32 what, address data) external auth {
        if (what == "end") {
            end = EndLike(data);
        } else {
            revert("ESM/file-unrecognized-param");
        }

        emit File(what, data);
    }

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

    function fire() external {
        require(live == 1, "ESM/permanently-disabled");
        require(Sum >= min, "ESM/min-not-reached");

        if (proxy != address(0)) {
            DenyLike(end.vat()).deny(proxy);
        }
        end.cage();

        emit Fire();
    }

    function denyProxy(address target) external {
        require(live == 1, "ESM/permanently-disabled");
        require(Sum >= min, "ESM/min-not-reached");

        DenyLike(target).deny(proxy);
        emit DenyProxy(target, proxy);
    }

    function join(uint256 wad) external {
        require(live == 1, "ESM/permanently-disabled");
        require(end.live() == 1, "ESM/system-already-shutdown");

        sum[msg.sender] = add(sum[msg.sender], wad);
        Sum = add(Sum, wad);

        require(gem.transferFrom(msg.sender, address(this), wad), "ESM/transfer-failed");
        emit Join(msg.sender, wad);
    }

    function burn() external {
        gem.burn(gem.balanceOf(address(this)));
    }
}

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[{"inputs":[{"internalType":"address","name":"gem_","type":"address"},{"internalType":"address","name":"end_","type":"address"},{"internalType":"address","name":"proxy_","type":"address"},{"internalType":"uint256","name":"min_","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Deny","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"base","type":"address"},{"indexed":true,"internalType":"address","name":"pause","type":"address"}],"name":"DenyProxy","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"what","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"data","type":"uint256"}],"name":"File","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"what","type":"bytes32"},{"indexed":false,"internalType":"address","name":"data","type":"address"}],"name":"File","type":"event"},{"anonymous":false,"inputs":[],"name":"Fire","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Join","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"Rely","type":"event"},{"inputs":[],"name":"Sum","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"cage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"denyProxy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"end","outputs":[{"internalType":"contract EndLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"what","type":"bytes32"},{"internalType":"uint256","name":"data","type":"uint256"}],"name":"file","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"what","type":"bytes32"},{"internalType":"address","name":"data","type":"address"}],"name":"file","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"fire","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"gem","outputs":[{"internalType":"contract GemLike","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"join","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"live","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"min","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokesGovernanceAccess","outputs":[{"internalType":"bool","name":"ret","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"sum","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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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0000000000000000000000009f8f72aa9304c8b593d555f12ef6589cc3a579a2000000000000000000000000bb856d1742fd182a90239d7ae85706c2fe4e5922000000000000000000000000be8e3e3618f7474f8cb1d074a26affef007e98fb00000000000000000000000000000000000000000000152d02c7e14af6800000

-----Decoded View---------------
Arg [0] : gem_ (address): 0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2
Arg [1] : end_ (address): 0xBB856d1742fD182a90239D7AE85706C2FE4e5922
Arg [2] : proxy_ (address): 0xBE8E3e3618f7474F8cB1d074A26afFef007E98FB
Arg [3] : min_ (uint256): 100000000000000000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f8f72aa9304c8b593d555f12ef6589cc3a579a2
Arg [1] : 000000000000000000000000bb856d1742fd182a90239d7ae85706c2fe4e5922
Arg [2] : 000000000000000000000000be8e3e3618f7474f8cb1d074a26affef007e98fb
Arg [3] : 00000000000000000000000000000000000000000000152d02c7e14af6800000

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ipfs://f73118f1bab39dd398899b11ce3c935cf17c6c504942c0e6ddee6fc7205144a7