packages/contracts/src/contracts/current/utils/Ownable/Ownable.sol


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pragma solidity ^0.4.24;
pragma experimental ABIEncoderV2;

/*
 * Ownable
 *
 * Base contract with an owner.
 * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.
 */

import "./IOwnable.sol";

contract Ownable is IOwnable {
    address public owner;

    // Revert reasons
    string constant ONLY_CONTRACT_OWNER = "ONLY_CONTRACT_OWNER";

    constructor ()
        public
    {
        owner = msg.sender;
    }

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

    function transferOwnership(address newOwner)
        public
        onlyOwner
    {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }
}