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Outline

•  contract Owned
•    - function nominateNewOwner(address _ow ...
•    - function acceptOwnership()
•    - function _onlyOwner()
• interface ISystemStatus
•    - function accessControl(bytes32 sectio ...
•    - function requireSystemActive()
•    - function requireIssuanceActive()
•    - function requireExchangeActive()
•    - function requireExchangeBetweenPynths ...
•    - function requirePynthActive(bytes32 c ...
•    - function requirePynthsActive(bytes32 ...
•    - function systemSuspension()
•    - function issuanceSuspension()
•    - function exchangeSuspension()
•    - function pynthExchangeSuspension(byte ...
•    - function pynthSuspension(bytes32 curr ...
•    - function getPynthExchangeSuspensions( ...
•    - function getPynthSuspensions(bytes32[ ...
•    - function suspendPynth(bytes32 currenc ...
•    - function updateAccessControl(
•  contract SystemStatus is Owned, IS ... *
•    - function requireSystemActive()
•    - function requireIssuanceActive()
•    - function requireExchangeActive()
•    - function requirePynthExchangeActive(b ...
•    - function requirePynthActive(bytes32 c ...
•    - function requirePynthsActive(bytes32 ...
•    - function requireExchangeBetweenPynths ...
•    - function isSystemUpgrading()
•    - function getPynthExchangeSuspensions( ...
•    - function getPynthSuspensions(bytes32[ ...
•    - function updateAccessControl(
•    - function updateAccessControls(
•    - function suspendSystem(uint256 reason ...
•    - function resumeSystem()
•    - function suspendIssuance(uint256 reas ...
•    - function resumeIssuance()
•    - function suspendExchange(uint256 reas ...
•    - function resumeExchange()
•    - function suspendPynthExchange(bytes32 ...
•    - function suspendPynthsExchange(bytes3 ...
•    - function resumePynthExchange(bytes32 ...
•    - function resumePynthsExchange(bytes32 ...
•    - function suspendPynth(bytes32 currenc ...
•    - function suspendPynths(bytes32[] call ...
•    - function resumePynth(bytes32 currency ...
•    - function resumePynths(bytes32[] calld ...
•    - function _requireAccessToSuspend(byte ...
•    - function _requireAccessToResume(bytes ...
•    - function _internalRequireSystemActive ...
•    - function _internalRequireIssuanceActi ...
•    - function _internalRequireExchangeActi ...
•    - function _internalRequirePynthExchang ...
•    - function _internalRequirePynthActive( ...
•    - function _internalSuspendPynths(bytes ...
•    - function _internalResumePynths(bytes3 ...
•    - function _internalSuspendPynthExchang ...
•    - function _internalResumePynthsExchang ...
•    - function _internalUpdateAccessControl ...

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/**
 *Submitted for verification at Etherscan.io on 2021-07-07
*/

/*
    ___            _       ___  _                          
    | .\ ___  _ _ <_> ___ | __><_>._ _  ___ ._ _  ___  ___ 
    |  _// ._>| '_>| ||___|| _> | || ' |<_> || ' |/ | '/ ._>
    |_|  \___.|_|  |_|     |_|  |_||_|_|<___||_|_|\_|_.\___.
    
* PeriFinance: SystemStatus.sol
*
* Latest source (may be newer): https://github.com/perifinance/peri-finance/blob/master/contracts/SystemStatus.sol
* Docs: Will be added in the future. 
* https://docs.peri.finance/contracts/source/contracts/SystemStatus
*
* Contract Dependencies: 
*	- ISystemStatus
*	- Owned
* Libraries: (none)
*
* MIT License
* ===========
*
* Copyright (c) 2021 PeriFinance
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity 0.5.16;

// https://docs.peri.finance/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.peri.finance/contracts/source/interfaces/isystemstatus
interface ISystemStatus {
    struct Status {
        bool canSuspend;
        bool canResume;
    }

    struct Suspension {
        bool suspended;
        // reason is an integer code,
        // 0 => no reason, 1 => upgrading, 2+ => defined by system usage
        uint248 reason;
    }

    // Views
    function accessControl(bytes32 section, address account) external view returns (bool canSuspend, bool canResume);

    function requireSystemActive() external view;

    function requireIssuanceActive() external view;

    function requireExchangeActive() external view;

    function requireExchangeBetweenPynthsAllowed(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function requirePynthActive(bytes32 currencyKey) external view;

    function requirePynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function systemSuspension() external view returns (bool suspended, uint248 reason);

    function issuanceSuspension() external view returns (bool suspended, uint248 reason);

    function exchangeSuspension() external view returns (bool suspended, uint248 reason);

    function pynthExchangeSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function pynthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    function getPynthExchangeSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory exchangeSuspensions, uint256[] memory reasons);

    function getPynthSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory suspensions, uint256[] memory reasons);

    // Restricted functions
    function suspendPynth(bytes32 currencyKey, uint256 reason) external;

    function updateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) external;
}


// Inheritance


// https://docs.peri.finance/contracts/source/contracts/systemstatus
contract SystemStatus is Owned, ISystemStatus {
    mapping(bytes32 => mapping(address => Status)) public accessControl;

    uint248 public constant SUSPENSION_REASON_UPGRADE = 1;

    bytes32 public constant SECTION_SYSTEM = "System";
    bytes32 public constant SECTION_ISSUANCE = "Issuance";
    bytes32 public constant SECTION_EXCHANGE = "Exchange";
    bytes32 public constant SECTION_PYNTH_EXCHANGE = "PynthExchange";
    bytes32 public constant SECTION_PYNTH = "Pynth";

    Suspension public systemSuspension;

    Suspension public issuanceSuspension;

    Suspension public exchangeSuspension;

    mapping(bytes32 => Suspension) public pynthExchangeSuspension;

    mapping(bytes32 => Suspension) public pynthSuspension;

    constructor(address _owner) public Owned(_owner) {}

    /* ========== VIEWS ========== */
    function requireSystemActive() external view {
        _internalRequireSystemActive();
    }

    function requireIssuanceActive() external view {
        // Issuance requires the system be active
        _internalRequireSystemActive();

        // and issuance itself of course
        _internalRequireIssuanceActive();
    }

    function requireExchangeActive() external view {
        // Exchanging requires the system be active
        _internalRequireSystemActive();

        // and exchanging itself of course
        _internalRequireExchangeActive();
    }

    function requirePynthExchangeActive(bytes32 currencyKey) external view {
        // Pynth exchange and transfer requires the system be active
        _internalRequireSystemActive();
        _internalRequirePynthExchangeActive(currencyKey);
    }

    function requirePynthActive(bytes32 currencyKey) external view {
        // Pynth exchange and transfer requires the system be active
        _internalRequireSystemActive();
        _internalRequirePynthActive(currencyKey);
    }

    function requirePynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view {
        // Pynth exchange and transfer requires the system be active
        _internalRequireSystemActive();
        _internalRequirePynthActive(sourceCurrencyKey);
        _internalRequirePynthActive(destinationCurrencyKey);
    }

    function requireExchangeBetweenPynthsAllowed(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view {
        // Pynth exchange and transfer requires the system be active
        _internalRequireSystemActive();

        // and exchanging must be active
        _internalRequireExchangeActive();

        // and the pynth exchanging between the pynths must be active
        _internalRequirePynthExchangeActive(sourceCurrencyKey);
        _internalRequirePynthExchangeActive(destinationCurrencyKey);

        // and finally, the pynths cannot be suspended
        _internalRequirePynthActive(sourceCurrencyKey);
        _internalRequirePynthActive(destinationCurrencyKey);
    }

    function isSystemUpgrading() external view returns (bool) {
        return systemSuspension.suspended && systemSuspension.reason == SUSPENSION_REASON_UPGRADE;
    }

    function getPynthExchangeSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory exchangeSuspensions, uint256[] memory reasons)
    {
        exchangeSuspensions = new bool[](pynths.length);
        reasons = new uint256[](pynths.length);

        for (uint i = 0; i < pynths.length; i++) {
            exchangeSuspensions[i] = pynthExchangeSuspension[pynths[i]].suspended;
            reasons[i] = pynthExchangeSuspension[pynths[i]].reason;
        }
    }

    function getPynthSuspensions(bytes32[] calldata pynths)
        external
        view
        returns (bool[] memory suspensions, uint256[] memory reasons)
    {
        suspensions = new bool[](pynths.length);
        reasons = new uint256[](pynths.length);

        for (uint i = 0; i < pynths.length; i++) {
            suspensions[i] = pynthSuspension[pynths[i]].suspended;
            reasons[i] = pynthSuspension[pynths[i]].reason;
        }
    }

    /* ========== MUTATIVE FUNCTIONS ========== */
    function updateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) external onlyOwner {
        _internalUpdateAccessControl(section, account, canSuspend, canResume);
    }

    function updateAccessControls(
        bytes32[] calldata sections,
        address[] calldata accounts,
        bool[] calldata canSuspends,
        bool[] calldata canResumes
    ) external onlyOwner {
        require(
            sections.length == accounts.length &&
                accounts.length == canSuspends.length &&
                canSuspends.length == canResumes.length,
            "Input array lengths must match"
        );
        for (uint i = 0; i < sections.length; i++) {
            _internalUpdateAccessControl(sections[i], accounts[i], canSuspends[i], canResumes[i]);
        }
    }

    function suspendSystem(uint256 reason) external {
        _requireAccessToSuspend(SECTION_SYSTEM);
        systemSuspension.suspended = true;
        systemSuspension.reason = uint248(reason);
        emit SystemSuspended(systemSuspension.reason);
    }

    function resumeSystem() external {
        _requireAccessToResume(SECTION_SYSTEM);
        systemSuspension.suspended = false;
        emit SystemResumed(uint256(systemSuspension.reason));
        systemSuspension.reason = 0;
    }

    function suspendIssuance(uint256 reason) external {
        _requireAccessToSuspend(SECTION_ISSUANCE);
        issuanceSuspension.suspended = true;
        issuanceSuspension.reason = uint248(reason);
        emit IssuanceSuspended(reason);
    }

    function resumeIssuance() external {
        _requireAccessToResume(SECTION_ISSUANCE);
        issuanceSuspension.suspended = false;
        emit IssuanceResumed(uint256(issuanceSuspension.reason));
        issuanceSuspension.reason = 0;
    }

    function suspendExchange(uint256 reason) external {
        _requireAccessToSuspend(SECTION_EXCHANGE);
        exchangeSuspension.suspended = true;
        exchangeSuspension.reason = uint248(reason);
        emit ExchangeSuspended(reason);
    }

    function resumeExchange() external {
        _requireAccessToResume(SECTION_EXCHANGE);
        exchangeSuspension.suspended = false;
        emit ExchangeResumed(uint256(exchangeSuspension.reason));
        exchangeSuspension.reason = 0;
    }

    function suspendPynthExchange(bytes32 currencyKey, uint256 reason) external {
        bytes32[] memory currencyKeys = new bytes32[](1);
        currencyKeys[0] = currencyKey;
        _internalSuspendPynthExchange(currencyKeys, reason);
    }

    function suspendPynthsExchange(bytes32[] calldata currencyKeys, uint256 reason) external {
        _internalSuspendPynthExchange(currencyKeys, reason);
    }

    function resumePynthExchange(bytes32 currencyKey) external {
        bytes32[] memory currencyKeys = new bytes32[](1);
        currencyKeys[0] = currencyKey;
        _internalResumePynthsExchange(currencyKeys);
    }

    function resumePynthsExchange(bytes32[] calldata currencyKeys) external {
        _internalResumePynthsExchange(currencyKeys);
    }

    function suspendPynth(bytes32 currencyKey, uint256 reason) external {
        bytes32[] memory currencyKeys = new bytes32[](1);
        currencyKeys[0] = currencyKey;
        _internalSuspendPynths(currencyKeys, reason);
    }

    function suspendPynths(bytes32[] calldata currencyKeys, uint256 reason) external {
        _internalSuspendPynths(currencyKeys, reason);
    }

    function resumePynth(bytes32 currencyKey) external {
        bytes32[] memory currencyKeys = new bytes32[](1);
        currencyKeys[0] = currencyKey;
        _internalResumePynths(currencyKeys);
    }

    function resumePynths(bytes32[] calldata currencyKeys) external {
        _internalResumePynths(currencyKeys);
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function _requireAccessToSuspend(bytes32 section) internal view {
        require(accessControl[section][msg.sender].canSuspend, "Restricted to access control list");
    }

    function _requireAccessToResume(bytes32 section) internal view {
        require(accessControl[section][msg.sender].canResume, "Restricted to access control list");
    }

    function _internalRequireSystemActive() internal view {
        require(
            !systemSuspension.suspended,
            systemSuspension.reason == SUSPENSION_REASON_UPGRADE
                ? "PeriFinance is suspended, upgrade in progress... please stand by"
                : "PeriFinance is suspended. Operation prohibited"
        );
    }

    function _internalRequireIssuanceActive() internal view {
        require(!issuanceSuspension.suspended, "Issuance is suspended. Operation prohibited");
    }

    function _internalRequireExchangeActive() internal view {
        require(!exchangeSuspension.suspended, "Exchange is suspended. Operation prohibited");
    }

    function _internalRequirePynthExchangeActive(bytes32 currencyKey) internal view {
        require(!pynthExchangeSuspension[currencyKey].suspended, "Pynth exchange suspended. Operation prohibited");
    }

    function _internalRequirePynthActive(bytes32 currencyKey) internal view {
        require(!pynthSuspension[currencyKey].suspended, "Pynth is suspended. Operation prohibited");
    }

    function _internalSuspendPynths(bytes32[] memory currencyKeys, uint256 reason) internal {
        _requireAccessToSuspend(SECTION_PYNTH);
        for (uint i = 0; i < currencyKeys.length; i++) {
            bytes32 currencyKey = currencyKeys[i];
            pynthSuspension[currencyKey].suspended = true;
            pynthSuspension[currencyKey].reason = uint248(reason);
            emit PynthSuspended(currencyKey, reason);
        }
    }

    function _internalResumePynths(bytes32[] memory currencyKeys) internal {
        _requireAccessToResume(SECTION_PYNTH);
        for (uint i = 0; i < currencyKeys.length; i++) {
            bytes32 currencyKey = currencyKeys[i];
            emit PynthResumed(currencyKey, uint256(pynthSuspension[currencyKey].reason));
            delete pynthSuspension[currencyKey];
        }
    }

    function _internalSuspendPynthExchange(bytes32[] memory currencyKeys, uint256 reason) internal {
        _requireAccessToSuspend(SECTION_PYNTH_EXCHANGE);
        for (uint i = 0; i < currencyKeys.length; i++) {
            bytes32 currencyKey = currencyKeys[i];
            pynthExchangeSuspension[currencyKey].suspended = true;
            pynthExchangeSuspension[currencyKey].reason = uint248(reason);
            emit PynthExchangeSuspended(currencyKey, reason);
        }
    }

    function _internalResumePynthsExchange(bytes32[] memory currencyKeys) internal {
        _requireAccessToResume(SECTION_PYNTH_EXCHANGE);
        for (uint i = 0; i < currencyKeys.length; i++) {
            bytes32 currencyKey = currencyKeys[i];
            emit PynthExchangeResumed(currencyKey, uint256(pynthExchangeSuspension[currencyKey].reason));
            delete pynthExchangeSuspension[currencyKey];
        }
    }

    function _internalUpdateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) internal {
        require(
            section == SECTION_SYSTEM ||
                section == SECTION_ISSUANCE ||
                section == SECTION_EXCHANGE ||
                section == SECTION_PYNTH_EXCHANGE ||
                section == SECTION_PYNTH,
            "Invalid section supplied"
        );
        accessControl[section][account].canSuspend = canSuspend;
        accessControl[section][account].canResume = canResume;
        emit AccessControlUpdated(section, account, canSuspend, canResume);
    }

    /* ========== EVENTS ========== */

    event SystemSuspended(uint256 reason);
    event SystemResumed(uint256 reason);

    event IssuanceSuspended(uint256 reason);
    event IssuanceResumed(uint256 reason);

    event ExchangeSuspended(uint256 reason);
    event ExchangeResumed(uint256 reason);

    event PynthExchangeSuspended(bytes32 currencyKey, uint256 reason);
    event PynthExchangeResumed(bytes32 currencyKey, uint256 reason);

    event PynthSuspended(bytes32 currencyKey, uint256 reason);
    event PynthResumed(bytes32 currencyKey, uint256 reason);

    event AccessControlUpdated(bytes32 indexed section, address indexed account, bool canSuspend, bool canResume);
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000918153d6e806df9d4d33664d1cc580416171f720

-----Decoded View---------------
Arg [0] : _owner (address): 0x918153D6e806dF9d4D33664D1cC580416171f720

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000918153d6e806df9d4d33664d1cc580416171f720

SafeDecimalMath : 0xcae93f84bca6def3c6f8a7f2b4974a66472af6f3