Contract

Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

•  contract Owned
•    - function nominateNewOwner(address _ow ...
•    - function acceptOwnership()
•  contract Proxyable is Owned *
•    - function setProxy(address _proxy)
•    - function setMessageSender(address sen ...
•  contract Proxy is Owned *
•    - function setTarget(Proxyable _target)
•    - function setUseDELEGATECALL(bool valu ...
•    - function _emit(bytes callData, uint n ...

More Options

• Is this a proxy?
• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2018-06-12
*/

/* 
 * Havven Token Contract Proxy
 * ========================
 * 
 * This contract points to an underlying target which implements its
 * actual functionality, while allowing that functionality to be upgraded.
 */

pragma solidity 0.4.24;

/**
 * @title A contract with an owner.
 * @notice Contract ownership can be transferred by first nominating the new owner,
 * who must then accept the ownership, which prevents accidental incorrect ownership transfers.
 */
contract Owned {
    address public owner;
    address public nominatedOwner;

    /**
     * @dev Owned Constructor
     */
    constructor(address _owner)
        public
    {
        require(_owner != address(0));
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    /**
     * @notice Nominate a new owner of this contract.
     * @dev Only the current owner may nominate a new owner.
     */
    function nominateNewOwner(address _owner)
        external
        onlyOwner
    {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    /**
     * @notice Accept the nomination to be owner.
     */
    function acceptOwnership()
        external
    {
        require(msg.sender == nominatedOwner);
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner
    {
        require(msg.sender == owner);
        _;
    }

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

// This contract should be treated like an abstract contract
contract Proxyable is Owned {
    /* The proxy this contract exists behind. */
    Proxy public proxy;

    /* The caller of the proxy, passed through to this contract.
     * Note that every function using this member must apply the onlyProxy or
     * optionalProxy modifiers, otherwise their invocations can use stale values. */ 
    address messageSender; 

    constructor(address _proxy, address _owner)
        Owned(_owner)
        public
    {
        proxy = Proxy(_proxy);
        emit ProxyUpdated(_proxy);
    }

    function setProxy(address _proxy)
        external
        onlyOwner
    {
        proxy = Proxy(_proxy);
        emit ProxyUpdated(_proxy);
    }

    function setMessageSender(address sender)
        external
        onlyProxy
    {
        messageSender = sender;
    }

    modifier onlyProxy {
        require(Proxy(msg.sender) == proxy);
        _;
    }

    modifier optionalProxy
    {
        if (Proxy(msg.sender) != proxy) {
            messageSender = msg.sender;
        }
        _;
    }

    modifier optionalProxy_onlyOwner
    {
        if (Proxy(msg.sender) != proxy) {
            messageSender = msg.sender;
        }
        require(messageSender == owner);
        _;
    }

    event ProxyUpdated(address proxyAddress);
}

contract Proxy is Owned {

    Proxyable public target;
    bool public useDELEGATECALL;

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

    function setTarget(Proxyable _target)
        external
        onlyOwner
    {
        target = _target;
        emit TargetUpdated(_target);
    }

    function setUseDELEGATECALL(bool value) 
        external
        onlyOwner
    {
        useDELEGATECALL = value;
    }

    function _emit(bytes callData, uint numTopics,
                   bytes32 topic1, bytes32 topic2,
                   bytes32 topic3, bytes32 topic4)
        external
        onlyTarget
    {
        uint size = callData.length;
        bytes memory _callData = callData;

        assembly {
            /* The first 32 bytes of callData contain its length (as specified by the abi). 
             * Length is assumed to be a uint256 and therefore maximum of 32 bytes
             * in length. It is also leftpadded to be a multiple of 32 bytes.
             * This means moving call_data across 32 bytes guarantees we correctly access
             * the data itself. */
            switch numTopics
            case 0 {
                log0(add(_callData, 32), size)
            } 
            case 1 {
                log1(add(_callData, 32), size, topic1)
            }
            case 2 {
                log2(add(_callData, 32), size, topic1, topic2)
            }
            case 3 {
                log3(add(_callData, 32), size, topic1, topic2, topic3)
            }
            case 4 {
                log4(add(_callData, 32), size, topic1, topic2, topic3, topic4)
            }
        }
    }

    function()
        external
        payable
    {
        if (useDELEGATECALL) {
            assembly {
                /* Copy call data into free memory region. */
                let free_ptr := mload(0x40)
                calldatacopy(free_ptr, 0, calldatasize)

                /* Forward all gas and call data to the target contract. */
                let result := delegatecall(gas, sload(target_slot), free_ptr, calldatasize, 0, 0)
                returndatacopy(free_ptr, 0, returndatasize)

                /* Revert if the call failed, otherwise return the result. */
                if iszero(result) { revert(free_ptr, returndatasize) }
                return(free_ptr, returndatasize)
            }
        } else {
            /* Here we are as above, but must send the messageSender explicitly 
             * since we are using CALL rather than DELEGATECALL. */
            target.setMessageSender(msg.sender);
            assembly {
                let free_ptr := mload(0x40)
                calldatacopy(free_ptr, 0, calldatasize)

                /* We must explicitly forward ether to the underlying contract as well. */
                let result := call(gas, sload(target_slot), callvalue, free_ptr, calldatasize, 0, 0)
                returndatacopy(free_ptr, 0, returndatasize)

                if iszero(result) { revert(free_ptr, returndatasize) }
                return(free_ptr, returndatasize)
            }
        }
    }

    modifier onlyTarget {
        require(Proxyable(msg.sender) == target);
        _;
    }

    event TargetUpdated(Proxyable newTarget);
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"nominatedOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_target","type":"address"}],"name":"setTarget","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"callData","type":"bytes"},{"name":"numTopics","type":"uint256"},{"name":"topic1","type":"bytes32"},{"name":"topic2","type":"bytes32"},{"name":"topic3","type":"bytes32"},{"name":"topic4","type":"bytes32"}],"name":"_emit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"useDELEGATECALL","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"bool"}],"name":"setUseDELEGATECALL","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"target","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"_owner","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newTarget","type":"address"}],"name":"TargetUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"oldOwner","type":"address"},{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"}]

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

000000000000000000000000b12a54406840a7ddfa9246efb3bf4724bf55f5f8

-----Decoded View---------------
Arg [0] : _owner (address): 0xB12a54406840a7DDfa9246EfB3bF4724bF55f5f8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b12a54406840a7ddfa9246efb3bf4724bf55f5f8

bzzr://9e104efaf0a7b150d5357b3a38b0260a3741a240fef678863453d378cc0622b9