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  "source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\r\npragma solidity 0.6.12;\r\nimport \"./interfaces/IOwned.sol\";\r\n\r\n/**\r\n  * @dev Provides support and utilities for contract ownership\r\n*/\r\ncontract Owned is IOwned {\r\n    address public override owner;\r\n    address public newOwner;\r\n\r\n    /**\r\n      * @dev triggered when the owner is updated\r\n      *\r\n      * @param _prevOwner previous owner\r\n      * @param _newOwner  new owner\r\n    */\r\n    event OwnerUpdate(address indexed _prevOwner, address indexed _newOwner);\r\n\r\n    /**\r\n      * @dev initializes a new Owned instance\r\n    */\r\n    constructor() public {\r\n        owner = msg.sender;\r\n    }\r\n\r\n    // allows execution by the owner only\r\n    modifier ownerOnly {\r\n        _ownerOnly();\r\n        _;\r\n    }\r\n\r\n    // error message binary size optimization\r\n    function _ownerOnly() internal view {\r\n        require(msg.sender == owner, \"ERR_ACCESS_DENIED\");\r\n    }\r\n\r\n    /**\r\n      * @dev allows transferring the contract ownership\r\n      * the new owner still needs to accept the transfer\r\n      * can only be called by the contract owner\r\n      *\r\n      * @param _newOwner    new contract owner\r\n    */\r\n    function transferOwnership(address _newOwner) public override ownerOnly {\r\n        require(_newOwner != owner, \"ERR_SAME_OWNER\");\r\n        newOwner = _newOwner;\r\n    }\r\n\r\n    /**\r\n      * @dev used by a new owner to accept an ownership transfer\r\n    */\r\n    function acceptOwnership() override public {\r\n        require(msg.sender == newOwner, \"ERR_ACCESS_DENIED\");\r\n        emit OwnerUpdate(owner, newOwner);\r\n        owner = newOwner;\r\n        newOwner = address(0);\r\n    }\r\n}\r\n",
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}