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58 lines
1.9 KiB
Solidity
58 lines
1.9 KiB
Solidity
2 years ago
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// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)
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pragma solidity ^0.8.0;
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import "./Ownable.sol";
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/**
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* @dev Contract module which provides access control mechanism, where
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* there is an account (an owner) that can be granted exclusive access to
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* specific functions.
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*
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* By default, the owner account will be the one that deploys the contract. This
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* can later be changed with {transferOwnership} and {acceptOwnership}.
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*
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* This module is used through inheritance. It will make available all functions
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* from parent (Ownable).
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*/
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abstract contract Ownable2Step is Ownable {
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address private _pendingOwner;
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event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
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/**
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* @dev Returns the address of the pending owner.
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*/
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function pendingOwner() public view virtual returns (address) {
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return _pendingOwner;
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}
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/**
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* @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
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* Can only be called by the current owner.
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*/
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function transferOwnership(address newOwner) public virtual override onlyOwner {
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_pendingOwner = newOwner;
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emit OwnershipTransferStarted(owner(), newOwner);
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}
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/**
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* @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
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* Internal function without access restriction.
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*/
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function _transferOwnership(address newOwner) internal virtual override {
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delete _pendingOwner;
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super._transferOwnership(newOwner);
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}
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/**
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* @dev The new owner accepts the ownership transfer.
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*/
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function acceptOwnership() public virtual {
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address sender = _msgSender();
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require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
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_transferOwnership(sender);
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}
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}
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