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/**
 *Submitted for verification at BscScan.com on 2020-09-02
*/

pragma solidity 0.6.4;

interface ISystemReward {
    function claimRewards(address payable to, uint256 amount) external returns (uint256 actualAmount);
}

interface IRelayerHub {
    function isRelayer(address sender) external view returns (bool);
}

interface ILightClient {
    function isHeaderSynced(uint64 height) external view returns (bool);

    function getAppHash(uint64 height) external view returns (bytes32);

    function getSubmitter(uint64 height) external view returns (address payable);
}

contract System {
    bool public alreadyInit;

    uint32 public constant CODE_OK = 0;
    uint16 public constant bscChainID = 0x0038;
    address public constant VALIDATOR_CONTRACT_ADDR = 0x0000000000000000000000000000000000001000;
    address public constant SLASH_CONTRACT_ADDR = 0x0000000000000000000000000000000000001001;
    address public constant SYSTEM_REWARD_ADDR = 0x0000000000000000000000000000000000001002;
    address public constant LIGHT_CLIENT_ADDR = 0x0000000000000000000000000000000000001003;
    address public constant TOKEN_HUB_ADDR = 0x0000000000000000000000000000000000001004;
    address public constant INCENTIVIZE_ADDR = 0x0000000000000000000000000000000000001005;
    address public constant RELAYERHUB_CONTRACT_ADDR = 0x0000000000000000000000000000000000001006;
    address public constant GOV_HUB_ADDR = 0x0000000000000000000000000000000000001007;
    address public constant TOKEN_MANAGER_ADDR = 0x0000000000000000000000000000000000001008;
    address public constant CROSS_CHAIN_CONTRACT_ADDR = 0x0000000000000000000000000000000000002000;
    address public constant STAKING_CONTRACT_ADDR = 0x0000000000000000000000000000000000002001;
    address public constant STAKE_HUB_ADDR = 0x0000000000000000000000000000000000002002;
    address public constant STAKE_CREDIT_ADDR = 0x0000000000000000000000000000000000002003;
    address public constant GOVERNOR_ADDR = 0x0000000000000000000000000000000000002004;
    address public constant GOV_TOKEN_ADDR = 0x0000000000000000000000000000000000002005;
    address public constant TIMELOCK_ADDR = 0x0000000000000000000000000000000000002006;
    address public constant TOKEN_RECOVER_PORTAL_ADDR = 0x0000000000000000000000000000000000003000;

    modifier onlyCoinbase() {
        require(msg.sender == block.coinbase, "the message sender must be the block producer");
        _;
    }

    modifier onlyZeroGasPrice() {
        require(tx.gasprice == 0, "gasprice is not zero");
        _;
    }

    modifier onlyNotInit() {
        require(!alreadyInit, "the contract already init");
        _;
    }

    modifier onlyInit() {
        require(alreadyInit, "the contract not init yet");
        _;
    }

    modifier onlySlash() {
        require(msg.sender == SLASH_CONTRACT_ADDR, "the message sender must be slash contract");
        _;
    }

    modifier onlyTokenHub() {
        require(msg.sender == TOKEN_HUB_ADDR, "the message sender must be token hub contract");
        _;
    }

    modifier onlyGov() {
        require(msg.sender == GOV_HUB_ADDR, "the message sender must be governance contract");
        _;
    }

    modifier onlyValidatorContract() {
        require(msg.sender == VALIDATOR_CONTRACT_ADDR, "the message sender must be validatorSet contract");
        _;
    }

    modifier onlyCrossChainContract() {
        require(msg.sender == CROSS_CHAIN_CONTRACT_ADDR, "the message sender must be cross chain contract");
        _;
    }

    modifier onlyRelayerIncentivize() {
        require(msg.sender == INCENTIVIZE_ADDR, "the message sender must be incentivize contract");
        _;
    }

    modifier onlyRelayer() {
        require(IRelayerHub(RELAYERHUB_CONTRACT_ADDR).isRelayer(msg.sender), "the msg sender is not a relayer");
        _;
    }

    modifier onlyTokenManager() {
        require(msg.sender == TOKEN_MANAGER_ADDR, "the msg sender must be tokenManager");
        _;
    }

    modifier onlyStakeHub() {
        require(msg.sender == STAKE_HUB_ADDR, "the msg sender must be stakeHub");
        _;
    }

    modifier onlyGovernorTimelock() {
        require(msg.sender == TIMELOCK_ADDR, "the msg sender must be governor timelock contract");
        _;
    }

    modifier onlyTokenRecoverPortal() {
        require(msg.sender == TOKEN_RECOVER_PORTAL_ADDR, "the msg sender must be token recover portal");
        _;
    }

    // Not reliable, do not use when need strong verify
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }
}

library Memory {
    // Size of a word, in bytes.
    uint256 internal constant WORD_SIZE = 32;
    // Size of the header of a 'bytes' array.
    uint256 internal constant BYTES_HEADER_SIZE = 32;
    // Address of the free memory pointer.
    uint256 internal constant FREE_MEM_PTR = 0x40;

    // Compares the 'len' bytes starting at address 'addr' in memory with the 'len'
    // bytes starting at 'addr2'.
    // Returns 'true' if the bytes are the same, otherwise 'false'.
    function equals(uint256 addr, uint256 addr2, uint256 len) internal pure returns (bool equal) {
        assembly {
            equal := eq(keccak256(addr, len), keccak256(addr2, len))
        }
    }

    // Compares the 'len' bytes starting at address 'addr' in memory with the bytes stored in
    // 'bts'. It is allowed to set 'len' to a lower value then 'bts.length', in which case only
    // the first 'len' bytes will be compared.
    // Requires that 'bts.length >= len'
    function equals(uint256 addr, uint256 len, bytes memory bts) internal pure returns (bool equal) {
        require(bts.length >= len);
        uint256 addr2;
        assembly {
            addr2 := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
        return equals(addr, addr2, len);
    }

    function compareStrings(string memory a, string memory b) internal pure returns (bool) {
        return (keccak256(abi.encodePacked((a))) == keccak256(abi.encodePacked((b))));
    }

    // Copy 'len' bytes from memory address 'src', to address 'dest'.
    // This function does not check the or destination, it only copies
    // the bytes.
    function copy(uint256 src, uint256 dest, uint256 len) internal pure {
        // Copy word-length chunks while possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += WORD_SIZE;
            src += WORD_SIZE;
        }

        // Copy remaining bytes
        uint256 mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

    // Returns a memory pointer to the provided bytes array.
    function ptr(bytes memory bts) internal pure returns (uint256 addr) {
        assembly {
            addr := bts
        }
    }

    // Returns a memory pointer to the data portion of the provided bytes array.
    function dataPtr(bytes memory bts) internal pure returns (uint256 addr) {
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
    }

    // This function does the same as 'dataPtr(bytes memory)', but will also return the
    // length of the provided bytes array.
    function fromBytes(bytes memory bts) internal pure returns (uint256 addr, uint256 len) {
        len = bts.length;
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
    }

    // Creates a 'bytes memory' variable from the memory address 'addr', with the
    // length 'len'. The function will allocate new memory for the bytes array, and
    // the 'len bytes starting at 'addr' will be copied into that new memory.
    function toBytes(uint256 addr, uint256 len) internal pure returns (bytes memory bts) {
        bts = new bytes(len);
        uint256 btsptr;
        assembly {
            btsptr := add(bts, /*BYTES_HEADER_SIZE*/ 32)
        }
        copy(addr, btsptr, len);
    }

    // Get the word stored at memory address 'addr' as a 'uint'.
    function toUint(uint256 addr) internal pure returns (uint256 n) {
        assembly {
            n := mload(addr)
        }
    }

    // Get the word stored at memory address 'addr' as a 'bytes32'.
    function toBytes32(uint256 addr) internal pure returns (bytes32 bts) {
        assembly {
            bts := mload(addr)
        }
    }
}

interface IParamSubscriber {
    function updateParam(string calldata key, bytes calldata value) external;
}

contract SystemReward is System, IParamSubscriber, ISystemReward {
    uint256 public constant MAX_REWARDS = 5e18;

    uint256 public numOperator;
    mapping(address => bool) operators;

    modifier doInit() {
        if (!alreadyInit) {
            operators[LIGHT_CLIENT_ADDR] = true;
            operators[INCENTIVIZE_ADDR] = true;
            numOperator = 2;
            alreadyInit = true;
        }
        _;
    }

    modifier onlyOperator() {
        require(operators[msg.sender], "only operator is allowed to call the method");
        _;
    }

    event rewardTo(address indexed to, uint256 amount);
    event rewardEmpty();
    event receiveDeposit(address indexed from, uint256 amount);
    event addOperator(address indexed operator);
    event deleteOperator(address indexed operator);
    event paramChange(string key, bytes value);

    receive() external payable {
        if (msg.value > 0) {
            emit receiveDeposit(msg.sender, msg.value);
        }
    }

    function claimRewards(
        address payable to,
        uint256 amount
    ) external override(ISystemReward) doInit onlyOperator returns (uint256) {
        uint256 actualAmount = amount < address(this).balance ? amount : address(this).balance;
        if (actualAmount > MAX_REWARDS) {
            actualAmount = MAX_REWARDS;
        }
        if (actualAmount != 0) {
            to.transfer(actualAmount);
            emit rewardTo(to, actualAmount);
        } else {
            emit rewardEmpty();
        }
        return actualAmount;
    }

    function isOperator(address addr) external view returns (bool) {
        return operators[addr];
    }

    function updateParam(string calldata key, bytes calldata value) external override onlyGov {
        if (Memory.compareStrings(key, "addOperator")) {
            bytes memory valueLocal = value;
            require(valueLocal.length == 20, "length of value for addOperator should be 20");
            address operatorAddr;
            assembly {
                operatorAddr := mload(add(valueLocal, 20))
            }
            operators[operatorAddr] = true;
            emit addOperator(operatorAddr);
        } else if (Memory.compareStrings(key, "deleteOperator")) {
            bytes memory valueLocal = value;
            require(valueLocal.length == 20, "length of value for deleteOperator should be 20");
            address operatorAddr;
            assembly {
                operatorAddr := mload(add(valueLocal, 20))
            }
            delete operators[operatorAddr];
            emit deleteOperator(operatorAddr);
        } else {
            require(false, "unknown param");
        }
        emit paramChange(key, value);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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"amount","type": "uint256"}],"name": "rewardTo","type": "event"},{"inputs": [],"name": "CODE_OK","outputs": [{"internalType": "uint32","name": "","type": "uint32"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "CROSS_CHAIN_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "GOVERNOR_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "GOV_HUB_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "GOV_TOKEN_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "INCENTIVIZE_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "LIGHT_CLIENT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "MAX_REWARDS","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "RELAYERHUB_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "SLASH_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "STAKE_CREDIT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "STAKE_HUB_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "STAKING_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "SYSTEM_REWARD_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "TIMELOCK_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "TOKEN_HUB_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "TOKEN_MANAGER_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "TOKEN_RECOVER_PORTAL_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "VALIDATOR_CONTRACT_ADDR","outputs": [{"internalType": "address","name": "","type": "address"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "alreadyInit","outputs": [{"internalType": "bool","name": "","type": "bool"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "bscChainID","outputs": [{"internalType": "uint16","name": "","type": "uint16"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "address payable","name": "to","type": "address"},{"internalType": "uint256","name": "amount","type": "uint256"}],"name": "claimRewards","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "nonpayable","type": "function"},{"inputs": [{"internalType": "address","name": "addr","type": "address"}],"name": "isOperator","outputs": [{"internalType": "bool","name": "","type": "bool"}],"stateMutability": "view","type": "function"},{"inputs": [],"name": "numOperator","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "string","name": "key","type": "string"},{"internalType": "bytes","name": "value","type": "bytes"}],"name": "updateParam","outputs": [],"stateMutability": "nonpayable","type": "function"},{"stateMutability": "payable","type": "receive"}]

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